KR102079540B1 - NH3 REDUCING AGENT SUPPLYING-EQUIPMENT SYSTEM BASED ON SOLID UREA FOR SCR(Selective Catalytic Reduction) DENITRIFICATION EQUIPMENT AND MANAGEMENT METHOD THEREOF - Google Patents

Abstract

The present invention relates to an ammonia reducing agent supply facility system based on solid urea for a selective reduction catalyst denitrification facility capable of generating an ammonia reducing agent based on solid urea; and an operating method thereof. According to the present invention, the operating method of the ammonia reducing agent supply facility system based on solid urea for a selective reduction catalyst denitrification facility includes: a solid urea adding step of adding powder-type solid urea to be used as an ammonia reducing agent; a solid urea supplying step of supplying the added solid urea; a solid urea melting step of receiving and melting the solid urea; a molten urea supplying step of supplying the molten urea to the following ammonia reducing agent producing step; an ammonia reducing agent producing step of receiving the molten urea, hydrolyzing the molten urea, and producing an ammonia reducing agent to be used in a selective reduction catalyst denitrification facility; and an ammonia reducing agent supplying step of supplying the produced ammonia reducing agent to a selective reduction catalyst denitrification facility.

Description

System for supplying solid urea-based ammonia reducing agent for selective reduction catalyst denitrification system and its operation method {NH3 REDUCING AGENT SUPPLYING-EQUIPMENT SYSTEM BASED ON SOLID UREA FOR SCR (Selective Catalytic Reduction)

The present invention relates to a solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment and its operation method, and more particularly, to ammonia reducing agent used in selective reduction catalyst (SCR) denitrification equipment based on solid urea as a raw material. It can produce and supply continuous, efficient and homogeneous ammonia reducing agent, and further, it can produce and supply ammonia reducing agent quickly and smoothly even after stopping operation such as inspection of ammonia reducing agent facility system. And a solid urea-based ammonia reducing agent supplying system for a selective reduction catalyst denitrification system capable of increasing economical efficiency, and a method of operating the same.

Exhaust gases emitted from thermal power plants, coal-fired power plants and / or incinerators generally contain large amounts of harmful substances such as hydrochloric acid, sulfur oxides, nitrogen oxides and dioxins.

In other words, a large amount of nitrogen oxide (NOx) is contained in the exhaust gas emitted from a thermal power plant using fossil fuel as an energy source, and the nitrogen oxide is known as a cause of acid rain and respiratory diseases.

Therefore, various techniques for removing nitrogen oxides contained in the exhaust gas have been developed, and a technology for reducing nitrogen oxides in air pollutants has not been clearly established yet and is currently selected for removing nitrogen oxides generated after combustion. Selective Catalytic Reduction (SCR) is considered to be the most useful in terms of economic and technical aspects among commercial technologies.

In general, a selective catalytic reduction system is a system for reducing nitrogen oxides by purifying exhaust gases generated from diesel engines, boilers, incinerators, etc., and a selective catalytic reduction system allows exhaust gases and a reducing agent to pass through a reactor equipped with a catalyst. The nitrogen oxide contained in the exhaust gas is reacted with a reducing agent and reduced with nitrogen and steam.

The selective catalytic reduction system is used by directly spraying urea (Urea) as a reducing agent for reducing nitrogen oxides or by spraying ammonia (NH ₃ ) generated by hydrolysis of urea.

The reducing agent is supplied and sprayed through the reducing agent supply system. The conventional reducing agent supply system supplies a reducing agent and compressed air to the injection nozzle during operation for reducing the nitrogen oxide, thereby supplying the reducing agent in which the injection nozzle is atomized in the hot gas.

When the selective catalytic reduction system is stopped, water is supplied to the reducing agent supply line to inject residual reducing agent into the hot gas through the injection nozzle, and air is supplied again to spray the remaining reducing agent and water in the reducing agent supply line. The removal was carried out.

However, when performing a purge operation using water and air to remove the reducing agent remaining in the reducing agent supply line, there is a problem that an excessive amount of reducing agent is sprayed through the spray nozzles at an initial stage. As a result, clogging may occur in the injection nozzle or deposits may be generated in the chamber in which the reducing agent is decomposed.

In addition, when the selective catalytic reduction system is to be shut down, an additional selective catalytic reduction system is required for the decomposition of the residual reducing agent removed from the reducing agent supply line. In addition, when the reducing agent remaining in the reducing agent supply line is not completely removed, the reducing agent crystallizes in the reducing agent supply line, causing various valves and the mass flow controller (MFC) installed in the reducing agent supply line to cause a malfunction.

On the other hand, as described above, the SCR technology has conventionally used a method of reducing NOx to nitrogen and water using ammonia as a reducing agent, but the use range of urea aqueous solution, which is easy to handle and store, is increasing.

1 is a schematic view showing a urea solution supplying device of a conventional SCR system. When urea solution is used as a reducing agent, the urea solution in the urea solution storage tank 1 is moved by the urea transfer pump 7 so that the urea solution filter ( After passing through 8), impurities or sediments contained in the urea solution are first removed and purified, and then circulated back to the urea solution storage tank 1, and when the urea supply pump 2 is operated continuously, the urea purified firstly The aqueous solution is secondarily filtered out of the urea supply filter 3 and then transferred to the flow regulating device 4, and is transferred to the urea spraying device 5 while controlling the flow rate in the flow regulating device 4. 5) Inside the double pipe is formed, the final injection into the exhaust gas by the compressed air, uniformly mixed with the exhaust gas in the mixer installed in front of the urea solution supply device of the SCR system to the catalyst layer Catalyst, and the components are collected is sent to the transfer filter 8 and the element supply filter 3 filtered impurities or sediment sediment collecting tank 6 at.

Reducing agent supply apparatus of the conventional SCR system as described above, when the urea solution is used as the reducing agent, the decomposition temperature of the urea in the process of decomposing the urea into ammonia while exposing the nozzle to the hot exhaust gas when the urea is injected into the reaction duct Due to the difference between (133 ℃) and the evaporation temperature (100 ℃) of the water contained in the urea solution, a phase-change reaction product is formed and adheres to the tip of the nozzle, causing nozzle plugging to occur. If the urea aqueous solution is not supplied, the urea aqueous solution remaining in the nozzle is not removed. Thus, a phase change reaction product is more easily formed. Therefore, the related field still prefers to use ammonia as a reducing agent.

Accordingly, while using ammonia as a reducing agent in the SCR technology, it is necessary and urgent to develop a technology and research that can supply the reducing agent more efficiently and effectively.

Republic of Korea Patent Registration 10-0667474 (January 12, 2007) Republic of Korea Patent Publication 10-1706881 (August 14, 2017) Republic of Korea Patent Registration 10-1489794 (2015.02.04.) Republic of Korea Patent Publication No. 10-2015-0133990 (published Dec. 1, 2015) Republic of Korea Patent Publication No. 10-2018-0002994 (published Jan. 09, 2018)

Accordingly, the present invention for solving the above-mentioned problems can provide an ammonia reducing agent used in a selective reduction catalyst (SCR) denitrification facility using solid urea as a base material, and provides a continuous, efficient and homogeneous ammonia reducing agent. The purpose of the present invention is to provide a solid urea-based ammonia reductant supply system for selective reduction catalyst denitrification equipment and its operation method that can be produced and supplied to increase overall equipment operability and economy.

In addition, the present invention provides ammonia reducing agent based solid urea for the selective reduction catalyst denitrification equipment that can increase the maintainability of the system by providing ammonia reducing agent quickly and smoothly after the operation stops, such as inspection of the ammonia reducing agent facility system. Another object is to provide an installation system and a method of operation thereof.

In addition, the present invention can prevent malfunction of the various valves and the mass flow controller (MFC) installed in the reducing agent supply line because the reducing agent does not crystallize in the reducing agent supply line, and the reducing agent remaining in the reducing agent supply line is urea melting apparatus Solid urea-based ammonia reducing agent supply equipment system for selective reduction catalyst denitrification equipment that can be recovered quickly and easily by part, etc., which not only increases the utility of the reducing agent but also prevents reducing agent crystallization and blockage in the reducing agent supply line and its Another purpose is to provide a method of operation.

The problem of the present invention is not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention for achieving the objects and other features of the present invention, as an operating method of the ammonia reducing agent supply equipment system for producing and supplying a reducing agent to be used in the selective reduction catalyst (SCR) denitrification equipment, A solid urea input step of introducing a powder-type solid urea to be used; A solid urea supplying step of supplying the injected solid urea; A solid urea melting step of receiving and melting the solid urea; A molten urea supplying step of supplying the molten molten urea to the following ammonia reducing agent generation step; Generating an ammonia reducing agent provided with the molten urea to hydrolyze the molten urea to produce an ammonia reducing agent to be used in a selective reduction catalyst denitrification facility; And ammonia reducing agent supplying step of supplying the produced ammonia reducing agent to the selective reduction catalyst denitrification facility. A method for operating a solid urea-based ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility is provided.

In one aspect of the invention, the solid urea is a powder or granular solid urea, the step of requiring a heat source in each of the steps in the operating method of the ammonia reducing agent supply equipment system is a heat source based on a single heat source It is characterized by that.

In one aspect of the invention, the solid urea input step may be made to prevent scattering to the atmosphere in the process of the solid urea is added.

In one aspect of the invention, the solid urea input step is preferably made to prevent the aggregation of the solid urea by at least one of the method of blowing dry air into the injected solid urea, applying vibration or dehumidification.

In one aspect of the invention, the solid urea supplying step is made to be controlled to be supplied according to the amount of melting of the solid urea melting step, the solid urea melting step may be made to filter out impurities contained in the molten urea discharged have.

In one aspect of the invention, the solid urea melting step is made to be filtered in each of the plurality of molten urea discharge line, is made to detect the degree of impurity occlusion in the discharge line, remove impurities in any one discharge line When executing the work, it can be made to discharge the molten urea to another discharge line.

In an aspect of the present invention, the method may further include purging the molten urea so that the molten urea does not remain in the flow line through which the molten urea is transferred before or after the start of operation of the ammonia reducing agent supply facility system.

In one aspect of the invention, the purging of the molten urea, by injecting steam in the upstream side of the molten urea flow passage to which the molten urea is conveyed to recover to the solid urea melting step side or discharged to the ammonia reducing agent generation step side Can be.

In one aspect of the invention, after the start-up operation of the ammonia reducing agent supply equipment system, the molten urea dissolved and supplied in the solid urea melting step may be made to return to the powdered solid urea melting step for a predetermined time. have.

In one aspect of the present invention, the molten urea supplying step may be configured to stop the feed supply operation of the molten urea by detecting the temperature of the molten urea to be transported and the detected value is less than the set value.

In one aspect of the present invention, the molten urea may further include supplying steam to the heat source supply line surrounding the gap with a gap in the molten urea transport pipe is supplied.

In one aspect of the present invention, the steam supplied to the heat source supply line is preferably made to have a temperature equal to or higher than the temperature of the steam supplied to other places.

In one aspect of the present invention, the step of producing the ammonia reducing agent is to hydrolyze the molten urea with a hydrolysis device to generate an ammonia reducing agent, so that steam, which is a heat source of the equipment system, is supplied to the medium for the catalytic reaction of the production of ammonia reducing agent Can be done.

In an aspect of the present invention, the method may further include supplying steam, which is a heat source of the plant system, to melt the catalyst material of the hydrolysis plant at the start or end of the operation of the ammonia reducing agent supply plant. have.

According to another aspect of the present invention, a system for supplying ammonia reducing agent for producing and supplying a reducing agent to be used in a selective reduction catalyst (SCR) denitrification facility, the solid phase urea input unit unit into which the solid urea to be used as the ammonia reducing agent; A solid urea supply unit configured to supply the solid urea introduced into the solid urea input unit to a solid urea melting unit; A solid urea melter unit configured to melt and receive solid urea from the solid urea supply unit; A molten urea supply unit configured to supply molten urea melted in the solid urea melting unit to a reactor unit for producing an ammonia reducing agent as follows; A reactor device unit for producing an ammonia reducing agent configured to generate ammonia reducing agent by hydrolyzing the molten urea through the molten urea supply unit; An ammonia reducing agent supply unit for supplying the ammonia reducing agent generated in the reactor apparatus for generating the ammonia reducing agent to a selective reduction catalyst denitrification facility; And a heat source supply device unit configured to supply a heat source to the device unit requiring a heat source among the device units. A solid urea-based ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility is provided.

In another aspect of the present invention, the solid urea is made of a solid or urea powder or granules, the solid urea input unit is an input unit hopper into which the solid urea is injected; An input amount detection level sensor which is provided in the input device portion hopper and configured to detect the input amount of the solid urea introduced; A solid urea scattering prevention device provided at an upper side of the input device unit hopper to prevent scattering into the air when solid urea is introduced; And solid state urea agglomeration prevention means configured to prevent agglomeration of solid urea introduced and provided at a lower side of the input device unit hopper.

In another aspect of the present invention, the solid urea scattering prevention device is composed of a bag filter device for collecting solid urea scattered, the bag filter device is made so that the opening end of the air outlet is downwardly opened The bag filter device may include a humidity sensor and a check valve at an air inlet, and may close the check valve when a predetermined humidity or more is detected by the humidity sensor.

In another aspect of the present invention, the solid urea agglomeration preventing means may include a solid air urea agglomeration preventing dry air supply device configured to supply dry air to the input device portion hopper side.

In another aspect of the invention, the solid urea agglomeration preventing dry air supply device refrigeration cycle device unit configured to cool and condensate the outside air; A heat exchange part configured to heat the air cooled by the refrigeration cycle device part by receiving a heat source of the heat source supply device part; A dry air control module unit controlling a supply amount of dry air heat-exchanged by the heat exchange unit; And at least one dry air blowing unit provided at a lower side of the feeder unit hopper and configured to blow out the drying air.

In another aspect of the present invention, the solid urea agglomeration preventing means may include a solid urea agglomeration prevention vibration device is provided on the lower side of the input device unit hopper is configured to apply vibration.

In another aspect of the present invention, the solid urea agglomeration vibration device is a bin activator (bin activator) configured on the lower side of the feeder unit hopper; And a bin activator control module unit for controlling the operation of the bin activator, wherein the bin activator control module unit receives a signal of a level sensor provided in the input device unit hopper and sets the bin activator to a predetermined frequency. Can be made to vibrate.

In another aspect of the present invention, the solid urea agglomeration preventing means may be configured on one side of the feeder portion hopper may include a dehumidification device for removing moisture in the feeder portion hopper.

In another aspect of the present invention, the solid urea supply unit portion a feeder unit hopper receiving the solid urea from the solid urea input unit; An input amount detection level sensor provided to detect an input amount of the solid urea which is provided in the supply apparatus hopper; A solid urea supply amount adjusting device provided at an upper side of the feeder unit hopper and configured to adjust a supply amount of solid urea; A solid urea feeding and feeding device which is provided at a lower end of the feeding device portion hopper and transfers the solid urea from the feeding device portion hopper to the solid urea melting device; And a solid urea supply device unit control module configured to control an operation of at least one of the solid urea supply amount adjusting device and the solid urea feed supply device to control the amount of solid urea supplied to the solid urea melting device. Can be.

In another aspect of the present invention, the input device unit hopper and the feeder unit hopper is composed of the inner surface of the epoxy coating, the solid urea supply amount adjusting device is composed of a rotary valve, the solid urea feed supply device is a screw It may consist of a screw feeder.

In another aspect of the present invention, it may further include a vibration preventing means provided between the input device unit hopper and the feeder unit hopper.

In another aspect of the present invention, the anti-vibration means may be made of a bellows-type connecting pipe for connecting between the feeder unit hopper and the feeder unit hopper.

In another aspect of the present invention, the solid urea melter unit is a solid urea melter body configured to receive a solid urea from the solid urea supply unit; A molten urea level sensor configured to detect the level or level of the molten urea of the solid urea melter body; A solid urea melter heating device configured to melt the solid urea supplied and provided to the solid urea melter body; And a molten urea filtering device configured to filter impurities included in the molten urea discharged provided on the molten urea discharge side of the solid urea melter body.

In another aspect of the present invention, the solid urea melter heating device is composed of a heat exchange pipe of a conductive material provided in the interior of the solid urea melter body having a spiral conduit, one end is the upper side of the molten urea melter body The other end may be configured to penetrate the lower side of the molten urea meter body, and the solid urea melter heating device may be configured to supply a heat source of the heat source supply device part.

In another aspect of the present invention, the solid urea melter heating apparatus may be configured inside and outside the solid urea melter body.

In another aspect of the present invention, the solid urea melter heating device comprises a first solid urea melter heating device configured in the solid urea melter body, and a second solid urea melter heating device configured on the outer surface of the solid urea melter body It includes, the first solid urea melter heating device and the second solid urea melter heating device may be configured to be supplied with a heat source of the heat source supply unit.

In another aspect of the present invention, the molten urea filtering device may be made of a metal mesh of a predetermined mesh provided on the molten urea discharge side of the solid urea melter body.

In another aspect of the present invention, the solid urea melting device may further include an impurity detection device configured to detect whether the molten urea filtering device removes impurities.

In another aspect of the present invention, the impurity detection device may be formed of a pressure sensor provided on the upstream and downstream sides of the molten urea filtering device, respectively, to detect pressure.

In another aspect of the present invention, the molten urea discharge port of the solid urea melter body includes a molten urea discharge line branched in two, the branch of the molten urea discharge line is configured with a flow path switching valve, Each of the molten urea discharge lines includes the molten urea filtering device, and the molten urea filtering device includes an impurity detection device configured to detect whether the molten urea filtering device removes impurities, and the impurity detection device includes the molten urea. The upstream and downstream sides of the filtering device, respectively, may be provided as a pressure sensor for detecting the pressure.

According to another aspect of the present invention, the molten urea supply unit portion is connected to the molten urea outlet side of the solid urea melter portion of the solid urea, the other end is connected to the molten urea transport pipe reactor for producing the ammonia reducing agent; A molten urea bypass pipe branched at a predetermined point of the molten urea feed pipe and connected to the solid urea melting device; A flow path switching valve provided at a branch point at which the molten urea bypass pipe is branched; A molten urea pumping device provided on an upstream side and a downstream side of the molten urea transfer pipe based on the flow path switching valve; A molten urea supply amount detecting device configured to detect a supply amount of molten urea that is configured and supplied to the molten urea conveying line based on the flow path switching valve; And a molten urea supply control module unit configured to control operations of the flow path switching valve, the molten urea pumping device, and the molten urea supply amount detecting device.

In another aspect of the present invention, the molten urea supply control module unit returns the molten urea discharged from the solid urea melter unit for a predetermined time after the start of the installation system to the solid urea melter unit through the molten urea bypass pipe can be controlled to return.

In another aspect of the present invention, the molten urea supply unit further comprises a molten urea temperature detection sensor provided on the upstream side of the molten urea transfer pipe on the basis of the flow path switching valve, the molten urea supply amount detecting device A molten urea supply amount detection sensor provided on a downstream side of the molten urea feed pipe on the basis of a flow path switching valve and detecting a supply amount of molten urea, and a downstream side of the molten urea supply amount detection sensor based on a direction in which the molten urea is supplied And a molten urea supply amount control valve configured to control the supply amount of the molten urea with a change in the open degree, and the molten urea supply control module unit receives the detected value detected by the molten urea temperature detection sensor and detects the detected value. When it is judged to be less than or equal to this set value, the molten urea upstream It can be made to stop the operation of the molten urea pumping device on the side.

In another aspect of the present invention, the molten urea purging device may be further configured to remove the molten urea remaining in the molten urea delivery pipe and the molten urea bypass pipe.

In another aspect of the present invention, the molten urea purging device is connected to the upstream side of the molten urea conveying pipe is a purging heat source supply line for supplying steam which is a heat source of the heat source supply unit; A heat source control valve provided in the purging heat source supply line and configured to control the supply of the heat source; And a molten urea supply control valve provided on the discharge side of the solid urea melting device.

In another aspect of the present invention, the molten urea supply unit is a mass flow meter which is configured on the downstream side of the molten urea transport pipe on the basis of the flow path switching valve to detect the supply amount of the molten urea supplied from the molten urea transport pipe line ; A jacket surrounding the mass flow meter; And a mass flow meter heat source supply line for supplying a heat source of the heat source supply device to the jacket, wherein the heat source supplied to the heat source supply line for the mass flow meter has a relatively higher temperature than the heat source supplied to the other device. It is preferable.

According to another aspect of the invention, the molten urea stable supply heat source supply pipe surrounding the molten urea feed pipe and the molten urea bypass pipe with a gap; And a heat source supply line connected to supply the heat source of the heat source supply device to the safety supply heat source supply pipe.

In another aspect of the present invention, the reactor apparatus for producing ammonia reducing agent may include a hydrolysis device, and the hydrolysis device may be configured to supply steam, which is a heat source of the heat source supply unit, for a catalytic reaction and a hydrolysis reaction. .

In another aspect of the present invention, the reactor device for producing ammonia reducing agent is steam or external air which is a heat source of the heat source supply device to melt the catalyst constituting the hydrolysis device at the start or the end of the operation of the equipment system. Cooling condensation may then be made to supply dry air heated with steam.

In another aspect of the present invention, the heat source supply unit may be configured to supply steam which is a heat source used in the operation of the selective reduction catalyst denitrification equipment.

According to the present invention, the solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification system and its operation method according to the present invention provide the following effects.

First, the present invention can produce a continuous, efficient and homogeneous ammonia reducing agent without supplying the ammonia reducing agent supply equipment system can be supplied to the selective reduction catalyst (SCR) denitrification equipment can increase the overall equipment operability and economic efficiency .

Second, the present invention has the effect of increasing the maintainability of the facility system by enabling the production and supply of ammonia reducing agent quickly and smoothly after the suspension of operation, such as inspection of the ammonia reducing agent facility system.

Third, the present invention can prevent the malfunction of the various valves and the mass flow controller (MFC) installed in the molten urea supply line because there is no crystallization of the molten urea in the molten urea supply line has an effect that can ensure the stability of the equipment have.

Fourth, the present invention can quickly and easily recover the molten urea remaining in the molten urea supply line to the urea melting apparatus unit, etc. to increase the utilization of urea as well as to prevent crystallization and blockage in the molten urea supply line. It can be effective.

Fifth, the present invention allows the solid urea in the powder state to be stored and supplied without agglomeration in the feeding process, indirect heat melting and melting of the solid urea in the powder state, and can prevent the self-polymerization by going through the circulation process in the supply process This is effective in securing supply stability.

Sixth, the present invention improves the quick response of the load fluctuation reaction time by using catalytic hydrolysis, and has an effect of easily controlling the amount of ammonia produced and the reaction rate.

The effects of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a schematic diagram showing a urea solution supply apparatus of a conventional SCR system.
2 is a flowchart schematically showing a method of operating a solid urea-based ammonia reducing agent supply system for a selective reduction catalyst denitrification system according to the present invention.
Figure 3 is a block diagram showing the overall configuration of a solid urea-based ammonia reducing agent supply equipment system for the selective reduction catalyst denitrification equipment according to the present invention.
Figure 4 is a view showing the configuration of the powder type solid urea input unit constituting a solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification equipment according to the present invention.
5 is a view showing the configuration of the powder-based solid urea melter unit constituting the solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification equipment according to the present invention.
6 is a view showing the configuration of a powder type solid urea supply unit constituting a solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification equipment according to the present invention.
7 is a view showing the configuration of the ammonia reducing agent supply unit constituting a solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification equipment according to the present invention.

Further objects, features and advantages of the present invention can be more clearly understood from the following detailed description and the accompanying drawings.

Prior to the detailed description of the present invention, the present invention may be variously modified and may have various embodiments, and the examples described below and illustrated in the drawings are intended to limit the present invention to specific embodiments. It is to be understood that the present invention includes all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

In addition, the terms "... unit", "... unit", "... module", and the like described in the specification mean a unit for processing at least one function or operation, which is hardware or software or hardware and It can be implemented in a combination of software.

In addition, in the description with reference to the accompanying drawings, the same components will be given the same reference numerals regardless of the reference numerals and duplicate description thereof will be omitted. In the following description of the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, throughout this specification, when a step is located "on" or "before" another step, it is not only when a step is in direct time-series relationship with the other step, but also after mixing with each step. As such, the order of the two phases includes the same rights as in the case of an indirect time series relationship in which the time series order can be reversed.

Hereinafter, a solid urea-based ammonia reducing agent supply system for a selective reduction catalyst denitrification system according to a preferred embodiment of the present invention and a method for operating an ammonia reducing agent supply facility operated by the same will be described in detail with reference to the accompanying drawings.

2 is a flowchart schematically showing a method of operating a solid urea-based ammonia reducing agent supply system for a selective reduction catalyst denitrification system according to the present invention.

Prior to the description, the solid urea described below may use a solid type urea of a powder type, granule type or prill type of a predetermined particle size, and block type of a predetermined size. In the present invention, it is preferable to use powdered or granular solid urea, and more preferably to use granular solid urea. Hereinafter, the powdered solid urea and the granular solid urea will be collectively described as the powdered solid urea as the solid urea.

The operating method of the solid urea-based ammonia reducing agent supplying system for the selective reduction catalyst denitrification system according to the present invention is a system for supplying a reducing agent for producing and supplying a reducing agent to be used in a selective reduction catalyst (SCR). As a method of operation, as shown in Figure 2, powdered solid urea feeding step (S100) for feeding the powdered solid urea (solid state) solid urea (solid state) to be used as ammonia reducing agent to the powdered solid urea input device (S100); The powdered solid urea supplying step of supplying the powdered solid urea injected into the powdered solid urea input device part in the powdered solid urea feeding step (S100) to the powdered solid urea melting device part through the powdered solid urea supply device (S200). ); A powdered solid urea melting step of receiving powdered solid urea through the solidus urea supply unit in the powdered solid urea supply step (S200) and melting the powdered solid urea through the powdered solid urea melting unit (S300); A molten urea supplying step (S400) of supplying the molten urea melted in the powdery solid urea melting step (S300) to an ammonia reducing agent generating step (S500) of producing ammonia (ammonia reducing agent); Ammonia reducing agent generating step (S500) of receiving a molten urea from the molten urea supplying step (S400) to generate ammonia reducing agent (through a reactor device for ammonia reducing agent generation) by generating ammonia reducing agent to be used in a selective reduction catalyst denitrification facility by hydrolyzing molten urea. ; And an ammonia reducing agent supplying step (S600) of supplying the ammonia reducing agent generated in the ammonia reducing agent generating step (S500) to a selective reduction catalyst denitrification facility.

The heat source required in each step and process of the operation method of the ammonia reducing agent supply facility system in the operation method of the ammonia reducing agent supply facility system is supplied with a single heat source.

That is, in the operating method of the ammonia reducing agent supply equipment system, the heat source for melting the powdered solid urea in the powdered solid urea melting step (S300), the solid urea melted in the molten urea supply supply step (S400) is transferred The heat source in the process, the heat source required to generate the ammonia reducing agent in the step of producing ammonia reducing agent (S500), and the heat source used for heat exchange to generate dry air to be described below are all single heat sources (preferably, Steam, which is a facility operating heat source used to operate the facility (specifically, saturated steam that is adjusted to have the temperature and pressure required in the step through a decompression device, etc.).

Hereinafter, each step of the operation method of the ammonia reducing agent supply equipment system described above will be described in detail.

Powdered solid urea injecting step (S100) is a process of putting a powdered (or granular) solid-type urea (powder-type solid urea) to be used as an ammonia reducing agent into a powdered solid urea input unit. Powdered solid urea of a predetermined size is introduced, prevents the injected powdered solid urea from being scattered into the atmosphere, and prevents agglomeration of the injected powdered solid urea to supply the powdered solid urea supplying step (S200), which is a subsequent process. Is done.

The powdered solid urea input step (S100), while the solid state of the powdered solid urea to be used as ammonia reducing agent is added, the powdered solid urea is prevented from being scattered into the air through the powdered solid urea scattering prevention device. The amount of the powdered solid urea to be injected is detected.

The powdered solid urea input step (S100) is made to prevent the agglomeration (aggregation) of the powdered solid urea introduced into the powdered solid urea in a subsequent process.

In addition, the powdered solid urea injecting step (S100) may be made so that the powdered solid urea introduced by epoxy coating on the inner wall surface of the powdered solid urea injector part may proceed smoothly to the subsequent process.

On the other hand, the powdered solid urea input step (S100) includes a powdered solid urea agglomeration prevention process for preventing agglomeration or agglomeration of the powdered solid urea is injected.

The powder solid urea agglomeration prevention process may be made to prevent the agglomeration of the powder solid urea by supplying dry air to the powder solid urea in the process or the state in which the powder solid urea is added.

The powder-based solid urea agglomeration prevention process, for example, by adjusting the outside air to have the temperature and pressure required in the step through a decompression device, such as steam (specifically, steam, the facility operating heat source) In saturated steam). At this time, the drying air is made of a cooling cycle and condensation of the outside air through a refrigerant cycle device unit including a cooler and a condenser, and then heated and dried with steam to be injected into the dry air without humidity (moisture) (through a blower fan). More preferred.

The injection of the dry air may be made to be injected in proportion to the consumption or set in a predetermined cycle while monitoring the consumption of the powdered solid urea introduced, but is not necessarily limited thereto.

In addition, the injection of the dry air can be controlled in conjunction with the powder-like solid urea vibration treatment to be described later.

Subsequently, the powdered solid urea agglomeration prevention process, when the powdered solid urea agglomeration prevention dry air as described above or alone, when proceeding to the subsequent process after the powdered solid urea input step, so as to apply a vibration Can be done.

The vibration for preventing the aggregation of the powdered solid urea is, for example, through a bin activator control module configured to configure an empty activator on the lower side of the powdered solid urea supply unit to control the operation of the empty activator. The control may be made to vibrate.

The bin activator control module unit may control to vibrate at a predetermined frequency according to the remaining amount of the powdered solid urea injected.

In addition, when the vibration and the supply of the dry air is made at the same time, for example, the drying air may be made at the same time as the vibration or immediately before or immediately after the vibration.

On the other hand, as another example, the powdered solid urea agglomeration prevention process is made, or alone or in combination with the dry air and vibration for preventing the powdered solid urea agglomeration, powdered solid urea It may further include a dehumidification treatment for removing moisture to.

This dehumidification treatment can be made to dehumidify using steam, which is a facility operating heat source (single heat source), as a heat source as a heat source required for the dehumidification process.

On the other hand, the powdered solid urea input step (S100) is a vibration preventing means that the vibration of the powdered solid urea vibrating unit is transmitted to the device unit of the subsequent process when the vibration type is applied as a powder solid urea agglomeration prevention process It can be made to prevent through.

The anti-vibration means is, for example, a bellows type for connecting between the powdered solid urea feeding unit hopper and the powdered solid urea feeding unit hopper and the powdered solid urea feeding unit hopper. ) It can consist of connecting pipes.

Next, the powdered solid urea supplying step (S200) is to receive the powdered solid urea from the powdered solid urea input step (S100) to quantitatively control and supply the powdered solid urea melting step (S300), which is a subsequent step. Is done.

In the powdered solid urea supplying step (S200), the powdered solid urea is supplied to the feeder unit hopper from the powdered solid urea input step (S100), but the powdered solid urea is quantitatively adjusted to control the powdered solid urea supplied. It is supplied to the transfer to the melt melting step (S300).

Here, the powdered solid urea supplying step (S200) includes detecting an input amount of the powdered solid urea introduced into the feeder unit hopper (through a level sensor for dose detection).

In addition, the powdered solid urea supply step (S200) may include a treatment that can prevent the aggregation of the powdered solid urea as described above.

And the powdered solid urea supply step (S200) may be supplied to the powdered solid urea melting step (S300) through the screw feeder (screw feeder).

In addition, the powdered solid urea supply step (S200) is made to be supplied with the powdered solid urea of the quantitative amount according to the melting amount (level signal) of the powdered solid urea melting step (S300) described below.

For example, the powdered solid urea supply step (S200) is a drive motor and / or a powdered solid urea supply amount control device (rotary valve) according to the melt amount (level signal) of the powdered solid urea melting step (S300). By controlling the operation of at least one of the drive motor of the powdered solid urea feed supply device (screw feeder) is made to supply a fixed amount of powdered solid urea.

Next, the powdered solid urea melting step (S300) is supplied with the powdered solid urea from the powdered solid urea supply step (S200) and melted, and delivers the molten molten urea to the molten urea supply step (S400) Here, it may be made to remove impurities contained in the molten urea delivered to the molten urea supply step (S400).

Specifically, the powdered solid urea melting step (S300), the powdered solid urea is supplied to the powdered solid urea melter body from the powdered solid urea supplying step (S200), and provided in the powdered solid urea melter body The powdered solid urea melter is heated to melt the powdered solid urea in the powdered solid urea melter body, and the impurities contained in the molten urea in the process of discharging the molten urea from the powdered solid urea melter body are filtered. Can be done.

The powdered solid urea melting step (S300) may be made to detect the level or level of the molten urea melted in the powdered solid urea melter body to be transmitted to the integrated control panel.

In addition, the melting of the powdered solid urea in the powdered solid urea melting step (S300) is passed through the steam (steam) as a heat source to the powdered solid urea melter heating device is configured inside and outside the powdered solid urea melter body It can be made to melt the powdered solid urea in the powdered solid urea melter body by heating.

The heat source passes through at a temperature (preferably 130 ° C. to 150 ° C. considering the melting point of the urea is 133 ° C.) capable of sufficiently melting the powdery solid urea.

Here, the steam heat exchanged while passing through the powdery solid urea melter heating apparatus may be made to be recovered to an external condenser, and dry air condensed from the outside may be supplied at the temperature instead of steam as the heat source. .

Subsequently, the powdered solid urea melting step (S300) includes a process of filtering impurities contained in the molten urea while the molten molten urea is discharged, and the filtering of the molten urea is performed in the powdered solid urea melter body. The filter unit may be provided by providing a metal filter network having a predetermined mesh at a lower end portion or a molten urea discharge side of the powdered solid urea melter body.

Here, the powder solid urea melting step (S300) may further include detecting whether impurities are removed.

The impurity removal detection may be performed by a pressure detection value of a pressure sensor provided at the front side and the rear side of the metal filter network, respectively. The pressure detection of the pressure sensor can monitor the timing of impurity removal due to the change in front and rear pressure depending on the degree of occlusion of the metal filter network.

In addition, the filtering of the molten urea may have a double filtering structure so that impurities may be removed without stopping the equipment system even during the operation of the equipment.

That is, the filtering of the molten urea is composed of a molten urea discharge line in which the lower end of the powdered solid urea melter body or the molten urea discharge port is divided into two, the flow path switching valve is formed in the branch, and the molten urea discharge is performed. Each of the lines can be made through a structure in which filtering of the molten ure can be carried out.

The filtering of the molten urea in such a double (multiple) structure is discharged to any one of the molten urea discharge lines through the flow path switching valve, and when it is necessary to remove impurities to the single molten urea discharge line. By switching the flow path switching valve to be discharged to another molten urea discharge line, it is possible to carry out the operation of removing impurities to the molten urea discharge line while maintaining the equipment operation.

Next, the molten urea supply step (S400), the filtered molten urea smoothly and homogeneously supplied to the ammonia reducing agent generation step (S500) for the production of ammonia reducing agent (ammonia), and also the melting time of the molten urea at the start-up of the equipment The molten urea may be made to be supplied after returning a certain amount of the molten urea for a predetermined time so as to shorten.

Here, after the end of the molten urea supply step (S400), that is, after the operation of the facility, the molten urea is purged so that the molten urea does not remain in the transport line so as to prevent the molten urea from sticking to the molten urea transport line. . Of course, this purge process can also be carried out as a pretreatment process prior to the start of plant operation. This purge process is described in detail below.

The molten urea supply step (S400) is supplied to the filtered molten urea transported to the ammonia reducing agent generation step (S500), but the molten urea supplied in the powdered solid urea melting step (S300) under the control of the molten urea supply control module unit It may include returning (or bypassing) the powdered solid urea melting step (S300) for a period of time after the system is started.

As such, when the equipment system starts up, the molten urea initially melted in the powdered solid urea melting step S300 by returning the molten urea initially melted for a predetermined time to the powdered solid urea melting step S300. This can shorten the time and increase plant operability and efficiency.

Next, the molten urea supply step (S400) may include detecting a supply amount of the molten urea and controlling the supply amount of the molten urea.

The supply amount control of the molten urea may be performed by controlling the opening degree of the molten urea supply amount control valve to a set value by receiving a detection signal (detection value) detected by the molten urea supply amount detection sensor configured on the molten urea feed pipe.

In addition, the molten urea supply step (S400) is a detection value is a set value or less, preferably based on a detection signal (detection value) detected by a temperature sensor configured on a molten urea feed pipe (preferably upstream feed pipe). Preferably it can be made to stop the supply operation of the molten urea is determined to be below the melting temperature of the urea.

In addition, the molten urea supply step (S400) may include precisely detecting the supply amount of the molten urea in the process of transporting the molten urea.

The precise detection of the molten urea supply amount is detected through a mass flowmeter configured on the downstream side of the molten urea feed pipe, the mass flow meter is wrapped in a jacket, and a heat source (preferably, a heat source for operation of the equipment) with the jacket. Phosphorus steam (saturated steam) is supplied.

Specifically, the heat source supplied to the jacket side of the mass flow meter is preferably made to have a temperature relatively higher than the temperature in the heat source supply line of the other portion (for example, the molten urea flow passage or the molten urea transfer line side). That is, in supplying steam, which is a heat source for facility operation, to each component, a pressure reducing device (a pressure reducing valve, that is, a pressure reducing valve for steam) is used to reduce the pressure so as to have an appropriate temperature in the corresponding component, and at this time, The heat source supply line for the jacket supplied to the jacket may have a temperature that is equal to or higher than that of the heat source supplied to other components (for example, solid urea supply, solid urea melt, molten urea supply, etc.). Can be.

In other words, in the present invention, the heat source uses steam (saturated steam) used to operate the entire facility. At this time, the first generated steam used in the operation of the equipment has the highest temperature and pressure. The pressure required in the step (or the corresponding part) is provided by installing a pressure reducing device in the heat source supply line to each part performing each step. It is supplied under reduced pressure to have a.

As described above, in the precise detection of the molten urea supply amount, the temperature of the side on which the mass flow meter is installed is made relatively higher than other locations so that the amount of molten urea supplied to the ammonia reducing agent generation step (S500) can be measured and supplied more precisely. do.

In addition, the molten urea supply step (S400) may include maintaining a molten urea of the molten urea moving along the molten urea transport pipe and the molten urea bypass pipe.

The molten urea molten state is maintained in the heat source supply line surrounding the molten urea conveying line and the molten urea bypass line. Saturated steam adjusted to have the temperature and pressure required in the process.

Here, the steam (saturated steam) supplied to the heat source supply line surrounding the molten urea conveying line and the molten urea bypass line is adjusted and supplied at an appropriate temperature and pressure so as to maintain the molten state of the molten urea stably. .

Next, the ammonia reducing agent generation step (S500) is made to generate ammonia (ammonia reducing agent) from the molten urea through the reactor device for producing ammonia reducing agent. For example, the ammonia reducing agent generation step (S500) is produced by supplying molten urea (eg, by spraying) to the inside of the hydrolysis chamber into which the heating fluid is introduced and hydrolyzing it with ammonia (NH ₃ ).

Here, the present invention is a heat source used to generate ammonia in the ammonia reducing agent generation step (S500) as a steam source (specifically, a facility operating heat source) used for operating the equipment (specifically, steam, a facility operating heat source, decompression device, etc.). Is a heat source based on saturated steam adjusted to have the temperature and pressure required for the step.

In other words, the ammonia reducing agent generating step (S500) may employ a well-known reactor that can generate ammonia (ammonia reducing agent) by hydrolysis by receiving molten urea, so a detailed configuration thereof will be omitted. However, the ammonia reducing agent generation step (S500) of the present invention corresponds to a medium that is required for catalytic reaction and steam that is a heat source used for operating the facility as a heat source for heating the reaction chamber (that is, steam that is a facility operating heat source through a decompression device or the like. Saturated steam adjusted to have the temperature and pressure required in the step).

For example, the ammonia reducing agent generation step (S500), the molten urea is introduced, the temperature at which the catalytic reaction can occur in the ammonia catalytic reaction body (or chamber) 5100 is provided with a catalyst material for catalytic reaction with urea therein Saturated steam (steam) is fed to an internal heating source (heat source supply pipe) for heating, and saturated steam is supplied for hydrolysis reaction with molten urea. , Ammonia (ammonia reducing agent) while detecting and controlling the temperature and flow rate).

The detection of the control environment detects the pressure and temperature of the ammonia catalytic reaction body through a temperature sensor and a pressure sensor, and adjusts the internal pressure of the ammonia catalytic reaction body through a flow controller.

Next, the ammonia reducing agent supplying step (S600) is a selective reduction catalyst (SCR) without changing the state of the ammonia (ammonia reducing material) generated in the ammonia reducing agent generation step (S500) through a supply pipe (supply line or supply line). Feed to the denitrification plant.

In the present invention, the ammonia reducing agent supplying step (S600) may be a heat source supply pipe surrounding the outer side of the ammonia reduction material supply pipe with a gap, the heat source supply pipe is steam or cooling condensation used in the operation of the facility Dry air heated by steam may be provided.

On the other hand, the operating method of the solid urea-based ammonia reducing agent supply plant system for the selective reduction catalyst denitrification plant according to the present invention, the catalyst material (for example, solidified catalyst) The method may further include a catalyst material melting process for melting the ash). Of course, such a molten metal treatment may also be carried out after the end of the operation.

The process of melting the catalyst material may include the step of saturating steam (specifically, steam, which is a heat source for operating the facility, through a decompression device, etc.) before being operated. It is possible to melt the solidified catalyst material by supplying saturated steam) or water (eg, water having a suitable temperature) adjusted to have a temperature and pressure necessary in the present invention.

The catalyst material melting process may be performed by detecting whether the catalyst material is solidified, but may be performed before operation of the ammonia reducing agent supply system without detecting the solidification. Of course, this catalyst melt treatment process may be performed immediately after the operation of the ammonia reducing agent supply facility system.

The operating method of the solid urea-based ammonia reducing agent supplying system for the selective reduction catalyst denitrification plant according to the present invention may further include such a catalyst material melting process, so that the ammonia reducing agent generation step (S500) can be more reliably performed. .

The catalyst melting process may be processed so that the catalyst material may be melted by condensing and cooling external air instead of steam (saturated steam), which is a heat source for operating the facility, and then inputting dry air heated by steam, which is a heat source for operating the facility. .

In addition, the operating method of the solid urea-based ammonia reducing agent supply equipment system for the selective reduction catalyst denitrification equipment according to the present invention is a flow tube in which the molten urea is supplied after the ammonia reducing agent supply equipment operation end or at the end point, specifically, molten urea The molten urea purging process may be further performed to remove or purge the molten urea remaining in the flow passage to which the gas is transferred and the bypass passage to be returned.

The molten urea purging process, for example, before or after the start of the operation of the ammonia reducing agent supply equipment, the equipment operating in the upstream side of the molten urea flow pipe (including molten urea transport pipe and molten urea bypass pipe) to which the molten urea is transported Steam (specifically, saturated steam adjusted to have the required temperature and pressure through a decompression device, etc.) is injected into the molten urea conveying line (melt urea flow line). The remaining molten urea may be recovered to the solid urea melting step side and / or discharged to the ammonia reducing agent generation step side to remove the molten urea remaining in the molten urea conveying line (melt urea flow line). The purging of the molten urea can be performed simultaneously or sequentially with the recovery to the melting step side and the discharge to the ammonia reducing agent generation step side by selectively opening and closing the valve provided on the flow path.

At this time, the molten urea purging process is a heat source supply line enclosed with a gap in the molten urea flow conduit to steam (specifically, to reduce the pressure of steam, which is a heat source for operation of the facility). Via saturated steam adjusted to have the temperature and pressure required for the stage) or after the feed has been preceded.

In addition, the molten urea purging process, the molten urea in the molten urea flow pipe (melt urea transport pipe and molten urea bypass pipe) by pumping (for a predetermined time) to the powder solid urea melting step (S300) side Recovering may be made to discharge to the ammonia reducing agent generation step (S500) side. Even in this case, steam, which is a heat source of the heat source supply unit (facility operating heat source) as a heat source supply line enclosed with a gap in the molten urea flow passage (specifically, steam, which is a facility operating heat source, is required at a corresponding stage through a decompression device or the like). May be carried out while supplying or after supply has been preceded.

As described above, the operation method of the ammonia reducing agent supply system of the present invention is a heat source used to operate a selective reduction catalyst denitrification facility and / or a single heat source used to operate ammonia reducing agent supply facility based on solid urea (equipment operating heat source). ) Is used.

For example, the heat source used to operate the selective reduction catalyst denitrification plant is typically steam (saturated steam), and thus the present invention uses steam (for example, steam in a step of reducing the pressure through a decompression device or the like). Saturated steam adjusted to have the temperature and pressure required in the above) is used as it is, and / or treated with dry air cooled by cooling condensation of the outside air and heated and dried by steam (saturated steam) to be connected to a predetermined device part of each stage. The heat source supply line is provided to each of the above-mentioned steps requiring a heat source. Of course, the medium for hydrolysis with the catalyst material in the ammonia reducing agent generation step (S500) is saturated steam (saturated steam adjusted to have the temperature and pressure required in the step through a decompression device, etc. ) Is used.

Next, as a specific embodiment for implementing the operation method of the solid urea-based ammonia reducing agent supply equipment system for the selective reduction catalyst denitrification equipment according to the present invention as described above, the solid urea-based ammonia reducing agent for the selective reduction catalyst denitrification equipment supply The equipment system will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing the overall configuration of a solid urea-based ammonia reducing agent supply equipment system for a selective reduction catalyst denitrification equipment according to the present invention, Figure 4 is a solid urea-based ammonia reducing agent for a selective reduction catalyst denitrification equipment according to the present invention It is a figure which shows the structure of the powder type solid urea injector part which comprises a supply facility system. 5 is a view showing the configuration of the powder solid urea melter unit constituting a solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification equipment according to the present invention, Figure 6 is a selective reduction catalyst denitrification equipment according to the present invention 7 is a view showing the configuration of the powder-based solid urea supply unit constituting the solid-state urea-based ammonia reducing agent supply system, Figure 7 is configured a solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification equipment according to the present invention It is a figure which shows the structure of the ammonia reducing agent supply apparatus part.

The solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification system according to the present invention is an ammonia reduction agent supply system for producing and supplying a reducing agent to be used in the selective reduction catalyst (SCR). As shown in FIG. 7, a powder type solid urea feeding unit into which a solid or solid urea of powder type or granule type (hereinafter collectively referred to as powder type) is introduced as a material to be used as ammonia reducing agent. 1000; A powdered solid urea supply unit 2000 configured to supply the powdered solid urea introduced into the powdered solid urea input unit 1000 to the powdered solid urea melting unit 3000 below; A powdered solid urea melting device unit 3000 configured to receive and melt the powdered solid urea from the powdered solid urea supply unit 2000; A molten urea supply unit 4000 configured to supply molten urea melted in the powdered solid urea melting unit 3000 to a reactor unit 5000 for producing an ammonia reducing agent below; A reactor apparatus unit 5000 for generating an ammonia reducing agent configured to generate ammonia reducing agent to be used in a selective reduction catalyst denitrification facility by receiving a hydrolysis reaction by receiving molten urea through the molten urea supply unit 4000; An ammonia reducing agent supply unit 6000 for supplying the ammonia reducing agent generated in the reactor unit 5000 for generating the ammonia reducing agent to a selective reduction catalyst denitrification facility; And a heat source supply device unit configured to supply a heat source to the device unit requiring a heat source among the device units.

Hereinafter, each component unit constituting the solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification system according to the present invention will be described in detail.

Powder type solid urea injector (1000)

The powder type solid urea injector unit 1000 prevents the powder type solid urea of a predetermined size from being introduced and scattered into the powder type solid urea atmosphere, and prevents agglomeration of the injected powder solid urea into powder. It is configured to supply to the type solid urea supply unit 2000.

As shown in FIG. 5, the powder type solid urea injector unit 1000 largely includes an input unit hopper 1100, a powder type solid urea scattering prevention device 1200, and a powder type solid urea agglomeration preventing unit. do.

Specifically, the powder type solid urea injector unit 1000 includes an input device unit hopper 1100 into which a solid urea in a powder state to be used as an ammonia reducing agent is injected; A powder type solid urea scattering prevention device 1200 provided at an upper side of the input device hopper 1100 to prevent scattering into the air when the powder type solid urea is introduced; And prevents agglomeration (agglomeration) of the powdered solid urea introduced and provided at the lower side of the input device portion hopper 1100 to smoothly provide the powdered solid urea to the powdered solid urea supply device 2000. It may be configured to include; powder type solid urea agglomeration prevention means.

The injector part hopper 1100 is formed in a common hopper shape, for example, a cylindrical body part 1110, and a funnel-shaped funnel part integrally formed under the cylindrical body part 1110. 1120.

The cylindrical body portion 1110 is provided with an input amount detection level sensor 1111 on each of the upper side and the lower side thereof to detect the input amount of the powdered solid urea introduced.

In this case, the dose detection level sensor 1111 may be configured electronically or mechanically, and is particularly limited as long as it is capable of detecting or detecting the dose of the powdered solid urea injected into the hopper 1100. It doesn't happen.

The inner wall surface of the funnel portion 1120 is preferably epoxy coated. As such, the funnel portion 1120 is coated with epoxy to minimize frictional force with the powdered solid urea so that the powdered solid urea can be smoothly and quickly proceeded to the lower side. Of course, the epoxy coating (layer) may also be formed on the inner wall surface of the cylindrical body portion 1110.

In addition, the funnel portion 1120 may be configured to prevent scattering apparatus 1200 and the powder-based solid urea aggregation means to be described later, but is not limited thereto.

Subsequently, the powder type solid urea scattering prevention device 1200 is provided on the upper side of the injector unit hopper 1100, that is, on the upper end of the body portion 1110 of the injector unit hopper 1100. It can be configured as a bag filter (bag filter) device for collecting the type solid urea.

Here, the bag filter device, which is the powder type solid urea scattering prevention device 1200, is configured such that an opening end of the air outlet is downwardly opened to prevent inflow of water during rain, and to prevent agglomeration of the powder type solid urea. Wet air removal means may be configured that are configured to prevent or eliminate the introduction of wet air.

For example, the wet air removing means may be configured of a humidity sensor and a check valve (one-way valve) on the air inlet side of the bag filter device to close the check valve when a certain level of humidity is detected by the humidity sensor. have.

As another example, the wet air removing means is a dry air (for example, dry air generated by a dry air supply device to be described later) is introduced into the bag filter device to remove the wet air in the bag filter device powder solid urea It is possible to prevent the aggregation of.

In addition, the bag filter device is preferably provided with a pleated pipe type filter member.

Next, the powdered solid urea agglomeration preventing means is a powdered solid urea agglomeration to prevent the agglomeration of the powdered solid urea injected into the feeder unit hopper 1100 by supplying dry air to the input device unit hopper 1100 side. Preventive dry air supply.

The dry solid urea preventive dry air supply device for a powder type is a refrigeration cycle unit unit including a cooler and a condenser configured to cool and condense external air, and supplying a heat source to be described in detail below the air cooled in the refrigeration cycle unit A heat exchanger for receiving and heating steam, which is a heat source of the device, a dry air control module for controlling a supply amount of dry air heated by heat exchange in the heat exchanger, and the supply device hopper 1100. It is provided on the lower side of one or more dry air blowing unit 1300 is configured to eject the air heated in the heat exchange unit.

The dry air control module unit may be configured to receive a signal from the level sensor 1111 and control supply of dry air in association with the signal.

In other words, the control module unit may be configured to supply the dry air in proportion to the consumption or in a set cycle while monitoring the consumption of the powdered solid urea in the feeder unit hopper 1100.

In addition, the control of the supply amount of dry air of the control module unit may be controlled in conjunction with a vibrating device for preventing agglomeration of the solid powder type urea to be described later.

Subsequently, the powdered solid urea agglomeration preventing means is provided at the lower side of the feeder unit hopper 1100 or vibrates alone or alone with the supply of the dry air for preventing the agglomerated powdered solid urea as described above. Powdered solid urea agglomeration prevention device for vibration may include.

The powder type solid urea agglomeration preventing device 1400, for example, controls the operation of the bin activator (bin activator) 1410, and the bin activator which is configured on the lower side of the feeder unit hopper 1100 It may be configured to include a bin activator control module unit 1420. Reference numeral 1411 denotes a motor that provides a driving force to the empty activator.

The bin activator control module unit 1420 receives a signal from the level sensor 1111 and vibrates at a predetermined frequency according to the remaining amount of the powdered solid urea present in the feeder unit hopper 1100.

In addition, the empty activator control module unit 1420, when the powder type solid urea aggregation prevention vibration device 1400 is configured together with the configuration for supplying the dry air for preventing the aggregation of powder type solid urea described above, In supply control of the dry air in conjunction with the dry air control module unit, for example, it may be made to interlock control so that dry air is input at the same time or immediately after the vibration.

Here, when the powder solid urea aggregation preventing vibration device 1400 is configured with the dry solid urea aggregation preventing dry air supply device described above, the empty activator control module unit 1420 and the dry air control module unit It may be composed of an integrated control panel or a control module.

On the other hand, as another example, the powdered solid urea agglomeration preventing means, the powdered solid urea agglomeration preventing air supply and the powdered solid urea agglomeration preventing device vibrating device (1400) or alone or in combination Is configured, may include a dehumidifier for removing moisture in the supply unit hopper 1100.

Since the dehumidifier can adopt a known configuration and operation method, detailed description thereof will be omitted. However, as described above, the heat source required by the dehumidifying apparatus is steam, which is a heat source (heat treatment equipment) of the heat source supply unit, which will be described in detail below. Saturated steam adjusted to have the temperature and pressure required in the process.

In addition, the powder type solid urea injector unit 1000 is a powder type solid urea agglomeration prevention means, when the powder type solid urea aggregation prevention vibration device 1400 is configured, the powder solid urea aggregation prevention vibration device (1400) Powder type solid urea injector unit 1000 to prevent the vibration (vibration of the input unit hopper 1100) from being transmitted to the supply unit hopper 2100 of the powder type solid urea supply unit 2000, which will be described later. And it may further comprise an anti-vibration means provided between the powder type solid urea supply unit 2000.

The anti-vibration means is, for example, the powdered solid urea input device hopper of the powdered solid urea input device unit 1000 and the powdered solid urea supply device of the powdered solid urea supply device unit 2000 The connection pipe connecting the secondary hopper 2100 may be configured as a bellows type pipe.

Powder solid urea supply unit (2000)

The powdered solid urea supply unit 2000 receives the powdered solid urea from the powdered solid urea injector unit 1000 and quantitatively controls and supplies it to the powdered solid urea melting unit 3000, which is a subsequent device unit. It is configured to.

As shown in FIG. 5, the powder type solid urea supply device 2000 includes a supply unit hopper 2100, a powder type solid urea supply amount adjusting device 2200, and a powder type solid urea feed supply device 2300. And, and powder type solid urea supply unit control module 2400.

Specifically, the powdered solid urea supply unit 2000 includes a feeder unit hopper (2100) receiving the powdered solid urea from the powdered solid urea input unit 1000; It is provided on the upper side of the feeder unit hopper 2100 is provided so that the powdered solid urea supplied from the powdered solid urea injector unit 1000 is quantitatively controlled and fed into the feeder unit hopper 2100. Powder type solid urea supply amount adjusting device 2200; Powdered solid urea transfer supply which is provided in communication with the lower end of the feeder unit hopper 2100 to transfer the powdered solid urea from the feeder unit hopper 2100 to the powdered solid urea melter unit 3000. Device 2300; And controlling the operation of the powdered solid urea supply amount adjusting device 2200 and / or the powdered solid urea feed supply device 2300 to supply the powdered solid urea melter unit 3000. It may be configured to include; powder type solid urea supply unit control module unit 2400, which is configured to control the supply amount.

The feeder portion hopper 2100 is formed in a conventional hopper shape, for example, a cylindrical funnel shape formed integrally with the body portion 2110 and the lower portion of the cylindrical body portion 2110 2120.

The cylindrical body portion 2110 is provided with an input amount detection level sensor 2111 on each of the upper side and the lower side of the cylindrical body 2110 to detect the input amount of the powdered solid urea.

Here, the input amount detection level sensor 2111 may be configured electronically or mechanically, and if the input amount of the powdered solid urea injected into the supply unit hopper 2100 can be detected or detected is particularly limited. It doesn't happen.

Also in such a feeder portion hopper 2100, the inner wall surface of the funnel portion 2120 is preferably epoxy coated. As such, the funnel portion 2120 is coated with epoxy to minimize frictional force with the powdered solid urea so that the powdered solid urea can be smoothly and quickly proceeded to the lower side. Of course, the epoxy coating (layer) can also be formed on the inner wall surface of the cylindrical body portion 2110.

In addition, the supply device hopper 2100 may be configured with the above-mentioned powder solid urea aggregation means.

Subsequently, the powder type solid urea supply amount adjusting device 2200 may be configured as a rotary valve configured at an upper end side of the supply unit hopper 2100. Reference numeral 2210 denotes a drive motor for providing a driving force to the rotary valve.

The powder type solid urea feed supply device 2300 may be connected to the feeder hopper 2100 at one end thereof and may be configured as a screw feeder having a feed screw 2310 formed therein. . Reference numeral 2320 denotes a drive motor for rotationally driving the transfer screw 2310.

Next, the powdered solid urea supply device control unit 2400 is a driving motor 2210 and / or the powdered solid urea feed supply device 2300 of the powdered solid urea supply amount control device 2200 By controlling the operation of the driving motor 2320 is made to control the supply amount of the powdered solid urea supplied to the powdered solid urea melter unit 3000.

That is, the powdered solid urea supply unit control module unit 2400 to supply the powdered solid urea of the quantitative according to the amount of melting (level signal) of the powdered solid urea melting unit 2300 described in detail below. A drive motor 2210 of the powdered solid urea supply amount adjusting device 2200 and / or a driving motor 2320 of the powdered solid urea feed supply device 2300 (a screw feeder which is a powdered solid urea feed supply device) Control at least one of the operations.

In other words, the powdered solid urea supply unit control module 2400 is a molten urea level for measuring the melt level (melt level) in the powdered solid urea melter body constituting the powdered solid urea melting unit 2300 Drive motor 2210 and / or the powdered solid urea supply regulator 2200 at a predetermined rate proportional to the consumption of molten urea while monitoring the melt level in the powdered solid urea dissolving device in response to a signal from the sensor 3110. It may be made to control the rotational speed of at least one of the driving motor 2320 of the powder-type solid urea feed supply device 2300.

Powder type solid urea melting device (3000)

The powdered solid urea melter unit 3000 receives the powdered solid urea from the powdered solid urea supply unit 2000 and melts it, and transfers the molten molten urea to the molten urea supply unit 4000. It may be configured to remove impurities contained in the molten urea delivered to the molten urea supply unit 4000.

As shown in FIG. 6, the powdered solid urea melter unit 3000 includes a powdered solid urea melter body 3100, a powdered solid urea melter heater 3200, and molten urea filtering. It can be configured to include a device 3300.

Specifically, the powdered solid urea melter unit 3000, the powdered solid urea melter body 3100 for receiving and receiving the powdered solid urea from the powdered solid urea supply unit 2000; A powdered solid urea melter heating device 3200 provided in the powdered solid urea melter body 3100 and configured to melt the powdered solid urea contained in the powdered solid urea melter body 3100; And a molten urea filtering device provided at a lower end (or molten urea discharge side) of the powdered solid urea melter body 3100 and configured to filter impurities included in the molten urea discharged from the powdered solid urea melter body 3100. 3300;

The powdered solid urea melter body 3100 is formed in the shape of a cone or hopper of the upper and lower strait, and for detecting the level or level of molten urea melted in the powdered solid urea melter body 3100 at one or more locations. The molten urea level sensor 3110 is configured.

Here, the molten urea level sensor 3110 may be configured electronically or mechanically, and the molten urea level sensor 3110 is not particularly limited as long as it can detect or detect the level of molten urea in the powdered solid urea melter body 3100. .

In addition, a bypass flow passage connector 3101 to which a molten urea bypass flow path device 4200 constituting a molten urea bypass pipe, which will be described later, is formed at one side of the powdered solid urea melter body 3100.

Subsequently, the powdered solid urea melter heating device 3200 is formed of a heat exchange pipe made of a conductive material provided inside the powdered solid urea melter body 3100 and has a spiral conduit, one end of the molten urea melter The upper side of the body 3100, and the other end is configured to penetrate the lower side of the molten urea body (3100).

The powdered solid urea melter heater 3200 is heated while passing through a heat exchange pipe through which the steam (saturated steam), which is a heat source of the heat source supply unit, will be described in detail below. The powdery solid urea inside is melted.

The heat source passes through at a temperature (preferably 130 ° C. to 150 ° C. considering the melting point of the urea is 133 ° C.) capable of sufficiently melting the powdery solid urea.

Here, the steam heat exchanged while passing through the powder solid urea melter heating device 3200 may be recovered to an external condenser.

Further, instead of steam as the heat source, dry air condensed and cooled by external air and then heated by steam (saturated steam) may be supplied at the above temperature. Here, the steam or dry air may be made to pass through the filtering device 3300 and then supplied to the powdered solid urea melter heating device 3200.

In addition, the powder solid urea melter heating device 3200 may be configured in a double structure in the powder solid urea melter body 3100.

In other words, the powdered solid urea melter heating device 3200 is a first (internal) powdered solid urea melter heating device configured in the powdered solid urea melter body 3100 as described above, and the powdered solid urea melter It may be composed of a second (outer) powder type solid urea melter heating device configured on the outer (outer surface) of the melter body 3100.

Steam (saturated steam), which is a heat source configured as described above, is branched at an inlet side and supplied to a first (internal) powder type solid urea melter heating device and a second (external) powder type solid urea melter heating device, and the first And a heat source passing through the second powder type solid urea melter heating apparatus may be joined at the outlet side and recovered to the outside side (external condenser).

Next, the molten urea filtering device 3300 is composed of a filtering device capable of removing impurities contained in the molten urea, preferably made of a material that is not deformed while sufficiently enduring the temperature of melting the powdered solid urea. .

For example, the molten urea filtering device 3300 is a metal filter having a predetermined mesh provided on the lower end of the powdered solid urea melter body 3100 or the molten urea discharge side of the powdered solid urea melter body 3100. Network.

In addition, the powder type solid urea melter unit 3000 may further include an impurity detection device for detecting whether the molten urea filtering device 3300 removes impurities.

The impurity detection device may be formed of, for example, a pressure sensor provided at the front side and the rear side of the molten urea filtering device 3300 to transmit a detection signal to the integrated control panel. Thus, the molten urea filtering device 3300 may be Since the back and forth pressure is changed according to the degree of occlusion by impurities, it is possible to monitor the timing of removing impurities in the molten urea filtering device 3300.

In addition, the molten urea filtering device (3300) is composed of a plurality and may be configured to remove impurities without interruption of the equipment system even during the operation of the equipment.

Specifically, the lower end portion or the molten urea discharge port of the powdered solid urea melter body 3100 is composed of a molten urea discharge line branched in two, the branch portion is configured with a flow path switching valve, each of the molten urea The molten urea filtering device 3300 is provided in a discharge line.

Here, the molten urea filtering device 3300 is provided with each of the impurity detection devices described above.

When the molten urea filtering device 3300 is configured in plural as described above, the filter is filtered through only one molten urea filtering device 3300 through a flow path switching valve, and the impurities of the one molten urea filtering device 3300 are removed. If necessary, it is possible to carry out an impurity removal operation for the one molten urea filtering device 3300 while maintaining the equipment operation by switching to another molten urea filtering device 3300 with a flow path switching valve. do.

Melt urea supply unit (4000)

The molten urea supply unit 4000 smoothly and homogeneously supplies the molten urea melted and impurity filtered in the powdered solid urea melting unit 3000 to the reactor unit 5000 for generating an ammonia reducing agent (ammonia), In addition, it is possible to shorten the melting time of the molten urea at the start-up of the plant, and in addition, purge the molten urea to remove the molten urea from the flow pipes (melt urea conveying line and molten urea bypass line) before and after the plant operation The molten urea is prevented from adhering to the pipeline.

As shown in FIG. 7, the molten urea supply unit 4000 includes a molten urea feed pipe 4100, a molten urea bypass pipe 4200, a flow path switching valve 4300, and a molten urea pumping device 4410. 4420, a molten urea supply amount detecting device, and a molten urea supply control module unit. The molten urea delivery line 4100 and the molten urea bypass line 4200 constitute a molten urea flow line.

Specifically, one end of the molten urea supply unit 4000 is connected to the molten urea outlet (melt urea discharge) side of the powdered solid urea melter unit 3000, the other end is connected to the reactor device unit 5000 A molten urea conveying pipe line 4100 connected thereto; A molten urea bypass pipe line 4200 which is branched at a predetermined point of the molten urea feed pipe line 4100 and connected to a bypass flow passage connector 3101 of the powdered solid urea melter unit 3000; A flow path switching valve 4300 provided at a branch point at which the molten urea bypass pipe line 4200 is branched; One or more molten urea pumping devices 4410 and 4420 provided on the upstream side and the downstream side of the molten urea delivery pipe 4100 based on the flow path switching valve 4300 to pump the molten urea to the reactor device 5000. ); A molten urea supply amount detecting device configured to detect a supply amount of the molten urea that is configured and supplied to the molten urea delivery pipe line 4100 based on the flow path switching valve 4300; And a molten urea supply control module unit configured to control operations of the flow path switching valve 4300, the molten urea pumping devices 4410 and 4420, and the molten urea supply amount detecting device.

The molten urea conveying pipe line 4100 is composed of a connecting pipe connecting the molten urea outlet (melt urea discharge) side and the reactor device part 5000 side of the powder-type solid urea melting apparatus 3000, the other components And a component that is closely related to the molten urea purging device 4500 and / or the molten urea melt state maintaining device 4600, which will be described in detail below. .

Subsequently, the molten urea bypass conduit 4200 is a powdered solid urea melting apparatus part (switching) of the flow path switching valve 4300 provided at the branch point under the control of the molten urea supply control module part. The molten urea from 3000 is returned to the powdered solid urea melter unit 3000 for a period of time after the initial startup (ie, the initial molten urea is recovered).

As such, when the operation of the installation system starts, the initial molten urea is initially melted in the powdered solid urea melter 3000 by returning (recovering) the molten urea initially to the powdered solid urea melter 3000 for a predetermined time. It is possible to shorten the melting time of the powdered solid urea and to increase the equipment operability and efficiency.

Next, the molten urea pumping device (4410, 4420) is a first molten urea pumping device (upstream side pumping device) configured on the upstream side on the molten urea transfer pipe 4100 based on the flow path switching valve (4300) 4410, and a second molten urea pumping device (downstream pumping device) 4420 configured on the downstream side.

Here, at least one of the first molten urea pumping device 4410 and the second molten urea pumping device 4420 is covered with a jacket, and the jacket is a heat medium (heat source supply unit in the present invention) The heat source (steam; heat source that reduced the saturated steam) to an appropriate temperature is supplied to facilitate the pumping operation of the molten urea, and the molten urea is fixed in the pumping devices 4410 and 4420 itself when the operation is terminated or stopped. Can be prevented.

Subsequently, the molten urea supply amount detecting device is provided on the downstream side of the molten urea conveying line 4100 based on the flow path switching valve 4300 to detect a supply amount of molten urea (flow sensor). And a molten urea supply amount control valve provided on a downstream side of the molten urea supply amount detection sensor based on a direction in which the molten urea is supplied, and configured to control the supply amount of the molten urea with a change in the open degree. The molten urea supply control module unit receives the detection signal (detection value) detected by the molten urea supply amount detection sensor to control the opening degree of the molten urea supply amount control valve to a set value.

In addition, the molten urea supply unit 4000 is at least one provided on the upstream side of the molten urea transfer pipe 4100 or the first molten urea pumping device 4410 on the basis of the flow path switching valve (4300). Further comprising a molten urea temperature detection sensor of the molten urea supply control module unit receives the detection signal (detection value) detected by the molten urea temperature detection sensor, the detection value is below the set value, preferably, melting of the urea When the temperature is determined to be lower than or equal to the temperature, the molten urea pumping device 410 may be configured to stop the operation of the upstream molten urea pumping device 4410 based on the flow path switching valve 4300.

On the other hand, the molten urea supply unit 4000 removes or removes the molten urea remaining in the flow pipe to which the molten urea is supplied after the operation of the facility is supplied, that is, the molten urea conveying pipe 4100 and the molten urea bypass pipe 4200. The apparatus may further include a molten urea purging device 4500 configured to purge.

The molten urea purging device 4500 is connected to an upstream side of the molten urea flow conduit and a purging heat source supply line 4520 to which steam (saturated steam), which is a heat source of the heat source supply device, is supplied, and the heat source supply A heat source control valve 4530 provided on the line 4520 and configured to control the supply of the heat source, and a molten urea supply control valve (not shown) provided on the discharge side of the powder-based solid urea melter unit 3000. It includes.

The molten urea purging device 4500 stops the supply of molten urea by closing the flow path switching valve 4300 and the molten urea supply control valve through the molten urea supply control module unit before starting the operation of the equipment system. The heat source control valve 4530 is opened to be opened to inject steam (saturated steam) as a heat source into the purging heat source supply line 4520, and the molten urea flow line (melt urea transfer line 4100 and the molten urea bypass line 4200). Not only causes the molten urea present in the apparatus to be returned to the powdered solid urea melter unit 3000, but also opens and closes the valve of each flow path alternately to return to the powdered solid urea melter unit 3000. Simultaneously or sequentially, the molten urea in the molten urea flow pipe is discharged to the reactor apparatus part 5000 for producing the ammonia reducing agent. It is so as not to exist is not to melt urea is not fixed within the molten urea flow tube after the end of the operation of the plant.

The molten urea purging is a heat source supply line 4510 for the flow line constituting the molten urea molten state maintaining device 4600, which will be described later, which is steam (specifically, a facility operation heat source). Steam may be carried out via a decompression device or the like to supply saturated steam adjusted to have the temperature and pressure required in the step or after the supply is preceded.

The purging of the molten urea may be performed by operating the first and second molten urea pumping devices 4410 and 4420 for a predetermined time before or after the start of the operation of the equipment system. The molten urea in the molten urea transfer pipe 4100 and the molten urea bypass pipe 4200 may be prevented from being pumped toward the powder type solid urea melting device part 3000 and the reactor device part 5000 for generating the ammonia reducing agent. have.

Subsequently, the molten urea supply unit 4000 may further include a molten urea supply amount precision detection device 4700 configured to precisely detect the supply amount of the molten urea supplied from the molten urea delivery pipe line 4100.

The molten urea supply amount precision detection device 4700 is provided on the downstream side of the molten urea delivery conduit 4100 (more preferably, on the downstream side of the molten urea pumping device 4420 based on the flow path switching valve 4300). The mass flow meter (4710), a jacket surrounding the mass flow meter (4710), and a heat source supply line for the mass flow meter for supplying steam (saturated steam) that is a heat source of the heat source supply device portion to the jacket. The jacket may constitute one component of the molten urea molten state maintaining apparatus 4600 described later.

Here, the heat source supplied to the jacket side of the mass flow meter 4710 is made to have a temperature relatively higher than the temperature in the heat source supply line of the other portion (for example, the molten urea flow pipe or the molten urea transfer line side). desirable. In other words, in supplying steam, which is a heat source for facility operation, to each component, a pressure reducing device (a pressure reducing valve, that is, a pressure reducing valve for steam) is used to reduce the pressure so as to have an appropriate temperature in the corresponding component, and at this time, the mass flow meter ( The heat source supply line for the jacket supplied to the jacket of 4710 is the same as or greater than the heat source supplied to other components (for example, solid urea supply unit, solid urea melting unit, molten urea supply unit, etc.). The temperature can be made to have a high temperature.

In this regard, the heat source in the present invention uses the steam (saturated steam) used to operate the entire installation. In this case, the steam as the heat source source has the highest temperature and pressure, and a pressure reducing device is installed in the heat source supply line to each of the device units to reduce the pressure so as to have a temperature required by the device unit.

In this way, in the molten urea supply precision detection device 4700, the molten urea supplied to the ammonia reducing agent generation reactor device part 5000 is made higher by heating the temperature of the heat source supplied to the side where the mass flow meter 4710 is installed relative to other locations. The supply amount of urea can be measured and supplied more precisely.

In addition, in the present invention, the molten urea supply unit 4000 maintains the molten urea molten state configured to stably maintain the molten urea moving along the molten urea flow pipe (melt urea feed pipe 4100). The apparatus 4600 may further include.

The molten urea molten state maintaining apparatus 4600 supplies the heat source to the heat source supply pipe line 4510 for the flow line surrounding the molten urea transfer pipe line 4100 with a gap, and the heat source supply pipe line 4510 for the flow line. It includes a heat source supply line for the flow line for supplying steam (saturated steam) that is a heat source of the device portion. In addition, the heat source supplied to the heat source supply pipe line 4510 for the flow line may be adjusted and supplied to an appropriate temperature and pressure (for example, 3.5 bar steam at 140 to 145 ° C.) through a decompression device.

The molten urea heat source supply pipe 4510 may also be configured in the molten urea bypass pipe 4200.

Reactor device part 5000 for producing ammonia reducing agent

The reactor device unit 5000 for generating an ammonia reducing agent is a reactor device unit for producing molten urea supplied through the molten urea supply unit 4000. The urea is decomposed into ammonia through the urea hydrolysis unit 5100. It is configured to supply ammonia as a reducing agent to the SCR denitrification plant.

The reactor device unit 5000 for producing ammonia reducing agent includes a known urea hydrolysis device and includes a reactor device unit for hydrolyzing urea to generate ammonia, wherein the reactor device unit 5000 for producing ammonia reducing agent is The heat source required to generate ammonia is a heat source based on steam (saturated steam), which is a heat source of the heat source supply unit, which will be described in detail below. Heat source adjusted to have

In other words, the reactor apparatus 5000 for generating the ammonia reducing agent 5000 may employ a known reactor device capable of generating ammonia (ammonia reducing agent) by hydrolysis by receiving molten urea, and thus a detailed configuration thereof will be omitted. However, the reactor apparatus 5000 for producing an ammonia reducing agent of the present invention is characterized in that steam (saturated steam) is used as a heating source for heating the inside of the reactor chamber to a predetermined temperature and a medium necessary for the catalytic reaction.

For example, the reactor device part 5000 for producing an ammonia reducing agent may include ammonia catalysis body in which molten urea is introduced and a catalyst material for catalysis with urea, and a catalyst reaction is performed inside the ammonia catalysis body. Ammonia catalyst reaction body heating device heated to a temperature that can occur and heated by steam (saturated steam) as a heat source of the heat source supply unit, and steam to cause gas decomposition reaction with the catalyst material provided inside the ammonia catalyst reaction body. A reactor heat source supply line provided with (saturated vapor), and reactor detection device (s) configured to detect and control the internal control environment (adjustment of pressure, temperature and flow rate) of the ammonia catalyst reaction body.

The reactor detection device includes a temperature sensor and a pressure sensor capable of detecting the pressure and temperature of the ammonia catalyzed body and a flow regulator configured to adjust the internal pressure of the ammonia catalyzed body.

Here, the reactor device unit 5000 for producing an ammonia reducing agent is a catalyst material melting process for melting the catalyst material (for example, the solidified catalyst material) at the start of operation of the ammonia reducing agent supply facility system or at the end of the operation. Is executed.

The catalyst material melt treatment may be performed in a step of saturating steam (specifically, steam, which is a heat source for operation of a facility, through a decompression device or the like) before operating the ammonia reducing agent supply facility system. Saturated steam adjusted to have the required temperature and pressure can be supplied, or water (eg, water having a suitable temperature) can be provided to melt the solidified catalyst material.

Such catalyst material melting treatment may be performed by detecting whether the catalyst material is solidified, but may be performed before or after the operation of the ammonia reducing agent supply facility system without detecting the solidification.

The solid urea-based ammonia reducing agent supply facility system for the selective reduction catalyst denitrification facility according to the present invention can perform the operation of the ammonia reducing agent generation reactor apparatus 5000 more reliably through such catalyst material melting treatment.

The catalyst melt treatment may be configured to condense and cool the outside air, not steam (saturated steam), which is a heat source for operation of the facility, and then melt the catalyst material by inputting dry air heated by steam, which is a heat source for operating the facility.

Ammonia Reducing Agent Supply Unit (6000)

The ammonia reducing agent supply unit 6000 may supply ammonia (ammonia reducing material) generated in the reactor apparatus unit 5000 for generating an ammonia reducing agent to a selective reduction catalyst (SCR) denitrification facility without changing the state (supply pipeline). Or a supply line).

In the present invention, the ammonia reducing agent supply unit 6000 may be a heat source supply pipe for supplying ammonia reducing agent surrounding the outside of the supply pipe with a gap, the heat source supply unit for the ammonia reducing agent supply heat source supply pipe. A heat source supply line may be provided in which steam, which is a heat source (steam adjusted to an appropriate temperature through a decompression device installed in a corresponding heat source supply line) or dry air of a predetermined temperature heated by steam by cooling and condensing external air, may be provided. It may be.

Heat source supply unit

Next, the heat source supply unit is provided so that the heat source used to operate the selective reduction catalyst denitrification facility and / or the heat source used to operate the solid urea-based ammonia reducing agent supply facility is provided to each of the above described device units requiring the heat source. It may consist of a heat source supply line.

For example, the heat source used to operate the selective reduction catalyst denitrification plant is typically steam (saturated steam), so that the present invention is that the steam as it is or the cooling air condensed and heated with steam, each device A heat source supply line connected to the unit is provided to each of the above-described apparatus units requiring a heat source.

Here, as mentioned above, the heat source in the present invention uses the steam (saturated steam) used to operate the entire installation. At this time, the first generated steam used in the operation of the equipment has the highest temperature and pressure, by installing a decompression device in the heat source supply line to each device unit is supplied by reducing the pressure to have the temperature required by the device unit.

The steam may be generated by heating the steam source using the waste heat of the generator or generator tube.

According to the solid urea-based ammonia reducing agent supply system for the selective reduction catalyst denitrification system and its operation method as described above, the continuous, efficient and homogeneous ammonia reducing agent is produced without stopping the ammonia reducing agent supply system. It can be supplied to the selective reduction catalyst (SCR) denitrification equipment, which can increase overall equipment operability and economic feasibility. There is an advantage that can increase the water retention.

In addition, the present invention can prevent the malfunction of the various valves and the mass flow controller (MFC) installed in the molten urea supply line is not crystallized in the molten urea supply line can ensure the stability of the equipment The reducing agent remaining in the molten urea supply line can be quickly and easily recovered by the urea melting device unit, etc., thereby increasing the utility of the urea and preventing crystallization and blockage in the molten urea supply line.

In addition, the present invention is to be stored and supplied without agglomeration of the powdered solid urea in the supply process, indirect heating and melting of the powdered solid urea, it is possible to prevent the self-polymerization by going through the circulation process in the supply process Supply stability can be ensured, and by using catalytic hydrolysis, the rapid response of the load fluctuation reaction time can be improved, and the ammonia production rate and reaction rate can be easily controlled.

Although the embodiments as described above have been described with reference to the accompanying drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or, even if replaced or substituted by equivalents, an appropriate result can be achieved.

The embodiments and the accompanying drawings described herein are merely illustrative of some of the technical ideas included in the present invention. Therefore, since the embodiments disclosed herein are not intended to limit the technical spirit of the present invention, but to describe, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. Modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical spirit included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

S100: powder type solid urea input step
S200: powdered solid urea supply stage
S300: powder solid urea melting step
S400: molten urea feed stage
S500: step of producing ammonia (ammonia reducing agent)
S600: Ammonia Reductant Supply Step
1000: powder type solid urea input unit
1100: input unit hopper
1110: cylindrical body portion
1111: level sensor for dose detection
1120: funnel-shaped funnel
1200: powder type solid urea scattering prevention device
1300: dry air blowing unit
1400: powder type solid urea agglomeration prevention vibration device
1410: bin activator
1411: empty activator drive motor
1420: bin activator control module
2000: powder type solid urea supply unit
2100: supply unit hopper
2110 cylindrical body part
2111: level sensor for dose detection
2120: funnel-shaped funnel
2200: powder solid urea supply amount control device
2210: Drive motor of powder solid urea supply amount control device
2300: powder solid urea feeder
2310: feed screw
2320: drive motor of feed screw
2400: powder type solid urea supply unit control module
3000: powder type solid urea melting device
3100: powdered solid urea melter body
3101: Bypass Euro Connector
3110: molten urea level sensor
3200: powder solid urea melter heater
3300: molten urea filtering device
4000: molten urea supply unit
4100: molten urea conveying line
4200: molten urea bypass pipeline
4300: flow path switching valve
4410: first molten urea pumping device
4420: second molten urea pumping device
4500: molten urea purging device
4510: heat source supply line for flow lines
4520: heat source supply line for purging
4530: heat source check valve
4600: molten urea molten state maintainer
4710: mass wander meter
4700: molten urea supply precise detection device
5000 reactor unit for producing ammonia reducing agent
5100: hydrolysis device
6000: ammonia reducing agent supply unit

Claims (44)

Selective reduction catalyst (SCR) As a method of operating ammonia reducing agent supply system for producing and supplying a reducing agent to be used in the denitrification plant,
A solid urea input step of injecting a powder-type solid urea to be used as an ammonia reducing agent;
A solid urea supplying step of supplying the injected solid urea;
A solid urea melting step of receiving and melting the solid urea;
A molten urea supplying step of supplying the molten molten urea to the following ammonia reducing agent generation step;
Generating an ammonia reducing agent provided with the molten urea to hydrolyze the molten urea to produce an ammonia reducing agent to be used in a selective reduction catalyst denitrification facility; And
Characterized in that it comprises a; ammonia reducing agent supplying step of supplying the produced ammonia reducing agent to the selective reduction catalyst denitrification facility
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
The solid urea is a powdered or granular solid urea,
In the operating method of the ammonia reducing agent supply facility system, the powdered solid urea melting step, the molten urea supply supply step, and the ammonia reducing agent generation step is characterized in that it is based on a single heat source
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
The solid urea input step
Characterized in that it is made to prevent scattering to the air in the process of the solid urea is added
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
The solid urea input step
Characterized in that it is made to prevent the aggregation of the solid urea by at least one method of blowing dry air, applying vibration or dehumidifying the solid urea into the input
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
The solid urea supplying step is made to be controlled to be supplied according to the amount of melting of the solid urea melting step,
The solid urea melting step is characterized in that made to filter and discharge impurities contained in the molten urea
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 5,
The solid urea melting step
It is made to be filtered in each of the plurality of molten urea discharge line, it is made to detect the degree of impurity occlusion in the discharge line, and when performing the removal of impurities in any one discharge line, to discharge the molten urea to another discharge line Characterized in that
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
And purging the molten urea so that the molten urea does not remain in the flow passage through which the molten urea is conveyed before or after the operation start of the ammonia reducing agent supply facility system.
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 7, wherein
Purging of the molten urea,
Injecting steam from the upstream side of the molten urea flow pipe to which the molten urea is transported to recover to the solid urea melting step side or discharged to the ammonia reducing agent generation step side
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
After the start-up of the ammonia reducing agent supply facility system, the molten urea dissolved and supplied in the solid urea melting step is returned to the solid urea melting step for a predetermined time period.
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
The molten urea supply step
Detecting the temperature of the molten urea to be fed and supplied, and when the detected value is less than or equal to the set value, stopping the feeding and supplying operation of the
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
It characterized in that it further comprises supplying steam to the heat source supply line surrounding the gap with a gap in the molten urea transport pipe is supplied to the molten urea
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 11,
Steam supplied to the heat source supply line is characterized in that it is made to have a temperature equal to or higher than the temperature of the steam supplied to other places
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 1,
The ammonia reducing agent generation step
The molten urea is hydrolyzed by a hydrolysis apparatus to generate an ammonia reducing agent, wherein steam, which is a heat source of the equipment system, is supplied to a medium for the catalytic reaction of the production of the ammonia reducing agent.
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 13,
It characterized in that it further comprises to provide the steam as a heat source of the equipment system to the hydrolysis device side to melt the catalyst material of the hydrolysis device at the start or end of the operation of the ammonia reducing agent supply equipment system
Method for operating solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
Selective reduction catalyst (SCR) Ammonia reducing agent supply system for producing and supplying a reducing agent to be used in the denitrification plant,
A solid urea input unit into which solid urea to be used as an ammonia reducing agent is injected;
A solid urea supply unit configured to supply the solid urea introduced into the solid urea input unit to a solid urea melting unit;
A solid urea melter unit configured to melt and receive solid urea from the solid urea supply unit;
A molten urea supply unit configured to supply molten urea melted in the solid urea melting unit to a reactor unit for producing an ammonia reducing agent as follows;
A reactor device unit for producing an ammonia reducing agent configured to generate ammonia reducing agent by hydrolyzing the molten urea through the molten urea supply unit;
An ammonia reducing agent supply unit for supplying the ammonia reducing agent generated in the reactor apparatus for generating the ammonia reducing agent to a selective reduction catalyst denitrification facility; And
And a heat source supply unit configured to supply a heat source to the solid urea supply unit, the solid urea supply unit, and the reactor unit for generating the ammonia reducing agent.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 15,
The solid urea is composed of a solid or urea powder or granules,
The solid urea injector unit is a solid state urea input device unit hopper is injected; An input amount detection level sensor which is provided in the input device portion hopper and configured to detect the input amount of the solid urea introduced; A solid urea scattering prevention device provided at an upper side of the hopper to feed the urea to prevent scattering into the air when the solid urea is introduced; And solid state urea agglomeration preventing means which is provided at the lower side of the input device portion hopper and configured to prevent agglomeration of the introduced solid urea.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 16,
The solid urea scattering prevention device is composed of a bag filter device for collecting solid urea scattered,
The bag filter device is formed such that the opening end of the air outlet is downwardly opened,
The bag filter device is composed of a humidity sensor and a check valve on the air inlet side, characterized in that configured to close the check valve when a certain level of humidity is detected by the humidity sensor.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 16,
The solid urea aggregation means
It characterized in that it comprises a solid air urea agglomeration preventing dry air supply device configured to supply dry air to the input device unit hopper side
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 18,
The solid air urea agglomeration preventing dry air supply device
A refrigeration cycle apparatus unit configured to cool and condense external air;
A heat exchange part configured to heat the air cooled by the refrigeration cycle device part by receiving a heat source of the heat source supply device part;
A dry air control module unit controlling a supply amount of dry air heat-exchanged by the heat exchange unit; And
And at least one dry air ejection unit provided at a lower side of the injector unit hopper and configured to eject the dry air.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 16,
The solid urea aggregation means
It is provided on the lower side of the input device hopper is characterized in that it comprises a solid urea aggregation prevention vibration device configured to apply vibration
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 20,
The solid urea aggregation vibration device is
A bin activator configured at a lower side of the input device hopper; And
Includes; the bin activator control module unit for controlling the operation of the empty activator,
The bin activator control module unit is configured to vibrate the bin activator at a predetermined frequency by receiving a signal from the level sensor provided in the input device unit hopper
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 16,
The solid urea aggregation means
It is configured on one side of the input unit hopper, characterized in that it comprises a dehumidifier for removing moisture in the input unit hopper
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 19,
The solid urea supply unit
A feeder unit hopper receiving solid urea from the solid urea input unit;
An input amount detection level sensor provided to detect an input amount of the solid urea which is provided in the supply apparatus hopper;
A solid urea supply amount adjusting device provided at an upper side of the feeder unit hopper and configured to adjust a supply amount of solid urea;
A solid urea feeding and feeding device which is provided at a lower end of the feeding device portion hopper and transfers the solid urea from the feeding device portion hopper to the solid urea melting device; And
And a solid urea supply device control unit configured to control the amount of solid urea supplied to the solid urea melting device by controlling the operation of at least one of the solid urea supply amount adjusting device and the solid urea feed supplying device. Characterized
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 23, wherein
The injector unit hopper and the feeder unit hopper is composed of the inner surface of the epoxy coating,
The solid urea supply amount control device is composed of a rotary valve,
The solid urea feed supply device is characterized by consisting of a screw feeder (screw feeder)
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 23, wherein
And an anti-vibration means provided between the input device part hopper and the supply device part hopper.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 25,
The anti-vibration means
Characterized in that the bellows-type connecting pipe connecting the input unit hopper and the supply unit hopper
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 15,
The solid urea melting device portion
A solid urea melter body configured to receive solid urea from the solid urea supply unit;
A molten urea level sensor configured to detect the level or level of the molten urea of the solid urea melter body;
A solid urea melter heating device configured to melt the solid urea supplied and provided to the solid urea melter body; And
And a molten urea filtering device configured to filter impurities contained in the molten urea discharged provided on the molten urea discharge side of the solid urea melter body.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 27,
The solid urea melter heating device is composed of a heat exchange pipe of a conductive material provided in the interior of the solid urea melter body having a spiral pipe, one end penetrates the upper side of the solid urea melter body, the other end is the solid upper right It is constructed through the lower side of the lea melter body,
The solid urea melter heating device is characterized in that configured to be supplied with a heat source of the heat source supply device portion.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 27,
The solid urea melter heating apparatus is characterized in that it is configured inside and outside the solid urea melter body
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 27,
The solid urea melter heating device includes a first solid urea melter heating device configured in the solid urea melter body, and a second solid urea melter heating device configured on an outer surface of the solid urea melter body,
The first solid urea melter heating device and the second solid urea melter heating device is characterized in that configured to be supplied with a heat source of the heat source supply device portion.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 27,
The molten urea filtering device is characterized in that consisting of a metal mesh of a predetermined mesh provided on the molten urea discharge side of the solid urea melter body
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 31, wherein
The solid urea melting device unit further comprises an impurity detection device configured to detect whether impurities of the molten urea filtering device are removed.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
33. The method of claim 32,
The impurity detection device
Characterized in that the pressure sensor for detecting the pressure provided on the upstream and downstream sides of the molten urea filtering device, respectively
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 27,
The molten urea outlet of the solid urea melter body includes a molten urea discharge line branched in two;
The branch of the molten urea discharge line is configured with a flow path switching valve,
The molten urea filtering device is provided in each of the molten urea discharge lines,
The molten urea filtering device is provided with an impurity detection device configured to detect whether the molten urea filtering device removes impurities,
The impurity detection device is characterized in that the pressure sensor for detecting the pressure provided on the upstream side and the downstream side with respect to the molten urea filtering device, characterized in that
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification equipment.
The method of claim 15,
The molten urea supply unit
A molten urea feed pipe having one end connected to the molten urea outlet side of the solid urea melting device part and the other end connected to the reactor device for generating the ammonia reducing agent;
A molten urea bypass pipe branched at a predetermined point of the molten urea feed pipe and connected to the solid urea melting device;
A flow path switching valve provided at a branch point at which the molten urea bypass pipe is branched;
A molten urea pumping device provided on an upstream side and a downstream side of the molten urea transfer pipe based on the flow path switching valve;
A molten urea supply amount detecting device configured to detect a supply amount of molten urea that is configured and supplied to the molten urea conveying line based on the flow path switching valve; And
And a molten urea supply control module unit configured to control operations of the flow path switching valve, the molten urea pumping device, and the molten urea supply amount detecting device.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
The molten urea supply control module unit controls to return the molten urea discharged from the solid urea melter unit to the solid urea melter unit through the molten urea bypass pipe for a predetermined time after the start of the installation system. By
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
The molten urea supply unit further includes a molten urea temperature detection sensor provided on the upstream side of the molten urea transport pipe on the basis of the flow path switching valve,
The molten urea supply amount detecting device is provided on the downstream side of the molten urea transport pipe on the basis of the flow path switching valve to detect the molten urea supply amount sensor for detecting the supply amount of molten urea, and the molten urea on the basis of the supply direction of the molten urea. A molten urea supply amount control valve provided on the downstream side of the urea supply amount detection sensor and configured to control the supply amount of the molten urea with a change in the open degree,
The molten urea supply control module unit receives the detection value detected by the molten urea temperature detection sensor, and when the detection value is determined to be less than or equal to the set value, the molten urea is supplied based on the direction in which the molten urea is supplied. Characterized in that the operation of the molten urea pumping device provided on the upstream side of the molten urea supply amount detection sensor
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
And further comprising a molten urea purging device configured to remove the molten urea remaining in the molten urea conveying line and the molten urea bypass line.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 38,
The molten urea purging device
A purging heat source supply line connected to an upstream side of the molten urea transfer pipe and supplied with steam, which is a heat source of the heat source supply device;
A heat source control valve provided in the purging heat source supply line and configured to control the supply of the heat source; And
And a molten urea supply control valve provided on the discharge side of the solid urea melting device unit.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
The molten urea supply unit
A mass flow meter configured on a downstream side of the molten urea conveying line on the basis of the flow path switching valve to detect a supply amount of the molten urea supplied from the molten urea conveying line;
A jacket surrounding the mass flow meter; And
And a heat source supply line for a mass flow meter for supplying a heat source of the heat source supply device to the jacket.
The heat source supplied to the heat source supply line for the mass flow meter is characterized in that it has the same or higher temperature than the heat source supplied to the other device unit
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
A heat source supply pipe for supplying stable molten urea that surrounds the molten urea transfer pipe and the molten urea bypass pipe with a gap; And
And a heat source supply line connected to supply the heat source of the heat source supply device to the heat supply supply pipe for stable supply.
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
The reactor device unit for producing ammonia reducing agent includes a hydrolysis device,
The hydrolysis device is characterized in that the steam is supplied as a heat source for the heat source supply unit for the catalytic reaction and hydrolysis reaction
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
The method of claim 42, wherein
The reactor device unit for generating the ammonia reducing agent is configured to cool and condense steam, which is a heat source of the heat source supply unit, or external air to melt the catalyst constituting the hydrolysis device at the start-up or the end of operation of the equipment system, and then supply the heat source. Characterized in that the dried air heated by the heat source of the device portion is supplied
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.
36. The method of claim 35 wherein
The heat source supply device unit
Characterized in that it is made to supply steam which is a heat source used in the operation of the selective reduction catalyst denitrification equipment
Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification.

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