KR102211712B1 - MELTING UREA FIXATION PREVENTING APPARATUS, MELTING UREA SUPPLY APPARATUS INCLUDING THE SAEM, AND NH3 REDUCING AGENT SUPPLYING-EQUIPMENT SYSTEM FOR SCR(Selective Catalytic Reduction) DENITRIFICATION EQUIPMENT COMPRISING THE MELTING UREA SUPPLY APPARATUS - Google Patents

Abstract

The present invention relates to a method for purging residual molten urea of an ammonia reducing agent supply facility system, and a method and a system for operating an ammonia reducing agent supply facility for a solid urea-based selective reduction catalyst denitrification facility including the same, wherein molten urea is prevented from sticking to and clogging a transfer pipeline by preventing the molten urea obtained by melting solid urea from remaining in the transfer pipe. According to the present invention, in a residual molten urea purging method of an ammonia reducing agent supply facility system for purging residual molten urea in a molten urea transfer pipe, a purging medium is injected from the upstream side of the molten urea transfer pipe where molten urea is transferred, and is discharged to the side of a solid urea melting device that melts urea, or the side of an ammonia reducing agent generating device unit that is provided with molten urea and generates an ammonia reducing agent.

Description

Method and system for purging residual molten urea in the ammonia reducing agent supply facility system, and the operation method and system for ammonia reducing agent supply facility for the selective reduction catalyst denitrification facility based on solid urea including the same. NH3 REDUCING AGENT SUPPLYING-EQUIPMENT SYSTEM FOR SCR(Selective Catalytic Reduction) DENITRIFICATION EQUIPMENT COMPRISING THE MELTING UREA SUPPLY APPARATUS}

The present invention relates to a method and system for purging residual molten urea in an ammonia reducing agent supply facility system, and a method and system for operating ammonia reducing agent supply facility for a selective reduction catalyst denitrification facility based on solid urea including the same, and more particularly, to a method and system for melting solid urea. A method for purging residual molten urea in an ammonia reducing agent supply facility system, which prevents molten urea from remaining in the transfer line of the facility to prevent the molten urea from sticking to the transfer line, and a solid urea-based selective purging method including the same It relates to a method and system for operating ammonia reducing agent supply facility for a reduction catalyst denitrification facility.

Exhaust gas emitted from a combined heat power plant, a coal-fired power plant, and/or an incineration plant generally contains a large amount of harmful substances such as hydrochloric acid gas, sulfur oxide, nitrogen oxide, and dioxins.

In other words, exhaust gas emitted from a thermal power plant using fossil fuels as an energy source contains a large amount of nitrogen oxides (NOx), which are known to cause acid rain and respiratory diseases.

Therefore, various technologies for removing nitrogen oxides contained in exhaust gas are being developed. However, technology to reduce nitrogen oxides among air pollutants has not yet been established, and is currently selective for removing nitrogen oxides generated after combustion. The catalytic reduction method (SCR: Selective Catalytic Reduction) is evaluated as the most useful commercial technology in terms of economic and technical aspects.

In general, the selective catalytic reduction system is a system for reducing nitrogen oxides by purifying exhaust gas generated from diesel engines, boilers, incinerators, etc., and the selective catalytic reduction system passes the exhaust gas and a reducing agent together through a reactor in which the catalyst is installed. Reduction treatment is performed with nitrogen and water vapor by reacting nitrogen oxides contained in exhaust gas with a reducing agent.

In the selective catalytic reduction system, urea is directly injected as a reducing agent to reduce nitrogen oxides or ammonia (NH ₃ ) generated by hydrolyzing urea is injected and used.

The reducing agent is supplied and injected through the reducing agent supply system. In the conventional reducing agent supply system, the reducing agent and compressed air are supplied to the spray nozzle during operation for reducing nitrogen oxides, so that the reducing agent atomized by the spray nozzle is supplied into the hot gas.

And when the operation of the selective catalytic reduction system is stopped, water is supplied to the reducing agent supply line, the residual reducing agent is injected into the hot gas through the injection nozzle, and air is supplied again to spray the residual reducing agent and water in the reducing agent supply line. Through the removal process was performed.

However, when performing a purge operation using water and air in order to remove the reducing agent remaining in the reducing agent supply line, there is a problem that an excessive amount of reducing agent is instantaneously injected through the spray nozzle at the beginning. Accordingly, there is a concern that a clogging phenomenon may occur in the spray nozzle or a deposit may be generated in the chamber in which the reducing agent is decomposed.

In addition, when the operation of the selective catalytic reduction system is to be stopped, operation of an additional selective catalytic reduction system is required to decompose 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 malfunctions in various valves and mass flow controllers (MFC) installed in the reducing agent supply line.

Meanwhile, as described above, conventionally, the SCR technology has used a method of reducing NOX to nitrogen and water using ammonia as a reducing agent. However, in addition to ammonia, the range of use of an aqueous urea solution that is easy to handle and store is increasing.

1 is a schematic diagram showing a urea aqueous solution supply device of a conventional SCR system. When a urea aqueous solution is used as a reducing agent, the urea aqueous solution in the urea aqueous solution storage tank 1 is moved by the urea transfer pump 7 and the urea transfer filter ( After passing through 8), impurities or precipitates contained in the urea aqueous solution are first removed and purified, and then circulated back to the urea aqueous solution storage tank (1). If the urea supply pump (2) is continuously operated, the first purified urea The aqueous solution is secondarily filtered by the urea supply filter 3 and then transferred to the flow control device 4, and transferred to the urea spraying device 5 while controlling the flow rate in the flow control device 4, and the urea spraying device ( 5) A double pipe is formed inside, and the compressed air is finally injected into the exhaust gas, and it is uniformly mixed with the exhaust gas in a mixer installed at the front of the urea aqueous solution supply device of the SCR system to contact the catalyst layer, and the urea transfer filter (8) The impurities or precipitates filtered by the and urea supply filter 3 are sent to the sediment collecting tank 6 and collected.

As described above, in the case of using an aqueous urea solution as a reducing agent, the reducing agent supply device of the conventional SCR system exposes the nozzle to high-temperature exhaust gas when urea is injected into the reaction duct, and the decomposition temperature of urea is decomposed into ammonia. Due to the difference between (133℃) and the evaporation temperature (100℃) of the moisture contained in the urea solution, a phase-transformed reaction product is formed, attached to the tip of the nozzle, and hardened, resulting in nozzle plugging. If the urea aqueous solution remaining inside the nozzle is not removed when the supply of the aqueous urea solution is stopped, a phase-transformed reaction product is more easily formed, and for this reason, it is still preferred to use ammonia as a reducing agent in related fields.

Accordingly, in the SCR technology, while using ammonia as a reducing agent, the technology and research to prevent molten urea from melting solid urea used as a base material for ammonia reducing agent from sticking in the molten urea transfer pipe after the facility operation is stopped or terminated. It is necessary and urgent to develop it.

Korean Registered Patent Publication 10-0667474 (announced on January 12, 2007) Korean Registered Patent Publication 10-1706881 (announced on February 14, 2017) Republic of Korea Patent Publication 10-1489794 (2015.02.04. Announcement) Republic of Korea Patent Publication 10-2015-0133990 (published on December 1, 2015) Republic of Korea Patent Publication 10-2018-0002994 (published on January 9, 2018)

Therefore, the present invention for solving the above-described conventional problems, ammonia to prevent molten urea from sticking to and clogging the transport pipe by preventing molten urea from melting solid urea from remaining in the transport pipe line of the facility. An object thereof is to provide a method for purging residual molten urea in a reducing agent supply facility system.

In addition, another object of the present invention is to provide an ammonia reducing agent supplying facility system and a method of operating the same, which can improve facility operability and economics of the overall ammonia reducing agent supplying facility system.

In addition, the present invention can efficiently use powdered or granular solid urea used as a base material for ammonia reducing agent used in a selective reduction catalyst (SCR) denitrification facility, and continuous, efficient and homogeneous in ammonia reducing agent supply system By allowing one ammonia reducing agent to be produced and supplied, the overall facility operability and economic efficiency can be increased, and the ammonia reducing agent can be produced and supplied quickly and smoothly even after shutdowns such as inspection of the ammonia reducing agent facility system, thereby increasing the maintainability of the facility system. Since the molten urea does not crystallize in the molten urea supply line (flow line), it is possible to prevent malfunction of various valves and mass flow controller (MFC) installed in the molten urea supply line. Remaining molten urea can be quickly and easily recovered or transferred to the urea melting unit and/or the ammonia reducing material generating unit, thereby increasing the utility of urea and preventing crystallization and blockage in the molten urea supply line. It is another object to provide a system for supplying ammonia reducing agent and a method of operation thereof.

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

According to a first aspect of the present invention for achieving the objects and other features of the present invention, as a method for purging residual molten urea in an ammonia reducing agent supply facility system for purging residual molten urea in a transfer pipe of molten urea, molten urea It is characterized by injecting a purging medium from the upstream side of the molten urea transfer pipe to be transferred to the solid urea melting unit to melt urea or to the ammonia reducing agent generating unit to generate an ammonia reducing agent by receiving the molten urea. There is provided a method for purging residual molten urea in an ammonia reducing agent supply equipment system.

In the first aspect of the present invention, the purging medium is characterized in that steam, which is a heat source for equipment operation.

According to a second aspect of the present invention, as a method of operating an ammonia reducing agent supply facility system for producing and supplying a reducing agent to be used in a selective reduction catalyst (SCR) denitrification facility, residual melting of the ammonia reducing agent supply facility system according to the first aspect There is provided a method of operating an ammonia reducing agent supply facility system comprising a urea purging method.

According to the third aspect of the present invention, as a method of operating an ammonia reducing agent supply facility system for producing and supplying a reducing agent to be used in a selective reduction catalyst (SCR) denitrification facility, a powder-type solid urea to be used as an ammonia reducing agent is introduced. Injecting solid urea; A solid urea supply step of supplying the input solid urea; A solid urea melting step of receiving and melting the solid urea; A molten urea supply step of supplying the molten molten urea to the ammonia reducing agent producing step; An ammonia reducing agent generating step of receiving the molten urea and hydrolyzing the molten urea to generate an ammonia reducing agent to be used in a selective reduction catalyst denitrification facility; And an ammonia reducing agent supplying step of supplying the generated ammonia reducing agent to a selective reduction catalyst denitrification facility; including, before or after the operation of the ammonia reducing agent supply facility system is started or terminated, at the upstream side of the molten urea flow pipe through which the molten urea is transferred Injecting steam to recover the solid urea melting unit performing the solid urea melting step, and discharging it to the ammonia reducing agent generating unit performing the ammonia reducing agent producing step. An operating method is provided.

According to a fourth aspect of the present invention, as a residual molten urea purging device of an ammonia reducing agent supply facility system for purging residual molten urea in a molten urea transfer line, the residual molten urea purging device is an upstream of the molten urea transfer line. A heat source supply line for purging which is connected in communication with the side to supply a heat source for facility operation; A molten urea bypass pipe branched at a predetermined point of the molten urea transfer pipe and connected to the solid urea melting apparatus unit; A flow path switching valve provided at a branch point at which the molten urea bypass pipe is branched; A heat source control valve provided in the purging heat source supply line and configured to control the supply of the heat source; And there is provided a residual molten urea purging device of the ammonia reducing agent supply equipment system comprising a; and a molten urea supply interruption valve provided on the discharge side of the melting apparatus unit to discharge the molten urea.

According to a fifth aspect of the present invention, a molten urea pumping device including the residual molten urea purging device according to the fourth aspect, and provided on an upstream side and a downstream side of the molten urea conveying pipe based on a flow path switching valve; A molten urea supply amount detecting device configured to detect a supply amount of molten urea supplied by being configured in the molten urea transfer pipe based on the flow path switching valve; And a molten urea supply control module unit configured to control the operation of the flow path switching valve, the molten urea pumping device, and the molten urea supply amount detecting device.Ammonia reducing agent supply facility system comprising a.

According to the method and system for purging residual molten urea of the ammonia reducing agent supplying system according to the present invention and the ammonia reducing agent supplying facility for a solid urea-based selective reduction catalyst denitrification facility including the same, the following effects are provided.

First, the present invention has the effect of improving the maintainability of the facility and preventing facility errors or breakdowns by preventing the molten urea from which the solid urea melted after the facility is stopped or terminated from sticking or clogging in the flowing transfer pipe. .

Second, in the present invention, since molten urea does not crystallize in the transfer pipe, malfunctions of various valves and mass flow controllers (MFC) installed in the molten urea supply line can be prevented, thereby securing facility stability.

Third, the present invention uses a powdered or granular solid urea as a base raw material as an ammonia reducing agent to be generated in the ammonia reducing agent supply system, while the molten urea melted by melting the solid urea is more smoothly and efficiently used in a subsequent unit or a subsequent process. There is an effect that can be supplied.

Fourth, the present invention can produce a continuous, efficient and homogeneous ammonia reducing agent in the ammonia reducing agent supply facility system and supply it to a selective reduction catalyst (SCR) denitrification facility, thereby increasing overall facility operability and economics.

Fifth, the present invention has the effect of increasing the maintainability of the facility system by allowing the ammonia reducing agent to be quickly and smoothly produced and supplied after the operation is stopped, such as the inspection of the ammonia reducing agent facility system.

Sixth, the present invention can quickly and easily recover or transfer the molten urea remaining in the molten urea flow line to the urea melting unit and/or the ammonia reducing material generating unit, thereby increasing the utility of urea and melting There is an effect of preventing crystallization and blockage in the urea flow line.

Seventh, the present invention allows powdered or granular solid urea to be injected and stored without clumping in the supply process, solid urea is indirectly heated and melted, and self-polymerization can be prevented by passing through a circulation process in the supply process. There is an effect of securing supply stability.

Eighth, the present invention has the effect of improving the rapid response of the load fluctuation reaction time by using the catalytic hydrolysis, and 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 that are not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a schematic diagram showing a urea aqueous solution supply device of a conventional SCR system.
2 is a flowchart schematically showing a method of operating a system for supplying an ammonia reducing agent for a selective reduction catalyst denitrification facility including a residual molten urea purging device according to the present invention.
3 is a block diagram showing the overall configuration of an ammonia reducing agent supply system for a selective reduction catalyst denitrification facility including a residual molten urea purging device according to the present invention.
Figure 4 is a view showing the configuration of a powder-type solid urea supply unit constituting the ammonia reducing agent supply equipment system for a selective reduction catalyst denitrification facility including the residual molten urea purging apparatus according to the present invention.
5 is a view showing the configuration of a powder-type solid urea melting device constituting the ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility including the residual molten urea purging device according to the present invention.
6 is a block diagram showing the configuration of a melting device unit and a molten urea supply unit of an ammonia reducing agent supplying system system including a residual molten urea purging apparatus according to the present invention.
7 is a view showing the configuration of an ammonia reducing agent supplying device part constituting the ammonia reducing agent supplying system for a selective reduction catalyst denitrification facility including the residual molten urea purging device according to the present invention.

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

Prior to the detailed description of the present invention, the present invention is capable of various modifications and various embodiments, and the examples described below and shown in the drawings are intended to limit the present invention to specific embodiments. It should be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

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

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

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

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

In addition, throughout the specification of the present application, when a step is positioned "on" or "before" another step, this is not only a case in which a step is in a direct time series relationship with another step, but also with the mixing step after each step. Likewise, the order of the two steps includes the same rights as in the case of an indirect time-series relationship that can change the order of the time series.

Hereinafter, a method for purging residual molten urea in an ammonia reducing agent supply facility system according to a preferred embodiment of the present invention, and a method and system for operating ammonia reducing agent supply facility for a solid urea-based selective reduction catalyst denitrification facility including the same, refer to the accompanying drawings. This will be described in detail.

First, a method for purging residual molten urea in the ammonia reducing agent supply facility system according to the present invention will be described in detail.

The residual molten urea purging method of the ammonia reducing agent supply facility system according to the present invention includes a transfer line through which molten urea is supplied after the ammonia reducing agent supply facility is stopped or operation is terminated or at the end, specifically, a transfer line through which molten urea is transferred, and It is made to remove or purging the molten urea remaining in the bypass pipe to be returned (bypassed).

Specifically, the method for purging residual molten urea in the ammonia reducing agent supplying facility system according to the present invention is, for example, a molten urea transfer line through which molten urea is transferred (melted urea transfer line and melting Steam, which is a heat source for facility operation (specifically, steam, which is a heat source for facility operation, is adjusted to have the required temperature and pressure through a decompression device) as a purging medium from the upstream side of the urea bypass pipe) ( Ammonia reducing agent generating device that recovers the molten urea remaining in the molten urea transfer pipe (melted urea transfer pipe) by high-speed input) to the solid urea melting unit that performs the solid urea melting step and/or performs the ammonia reducing agent generation step It may be made to be discharged to the negative side to remove the molten urea remaining in the molten urea transfer pipe (melted urea transfer pipe).

The purging of the molten urea can be performed simultaneously or sequentially with the recovery to the solid urea melting apparatus unit side and discharge to the ammonia reducing agent generating unit side by selectively opening and closing a valve installed on the flow path.

At this time, the molten urea purging process is a heat source supply line surrounding the molten urea transfer pipe with a gap, and the steam (specifically, steam, which is the heat source for facility operation, is reduced to a decompression device, etc.). It can also be carried out while supplying saturated steam adjusted to have the temperature and pressure required in the step) or after the supply has been preceded.

In addition, the molten urea purging treatment process, as another embodiment, by pumping the molten urea in the molten urea transfer line (melted urea transfer line and molten urea bypass line) (pumping for a certain period of time) to perform the powdery solid urea melting step. It may be recovered to the side of the lea melting device and discharged to the side of the ammonia reducing agent generating device for performing the ammonia reducing agent generating step.

Even in this case, steam, which is the heat source (heat source for facility operation) of the heat source supply unit, as a heat source supply line that surrounds the molten urea transfer pipeline with a gap (specifically, steam, which is the heat source for facility operation, is required at the step through a decompression device, etc.) It may be carried out while supplying saturated steam adjusted to have a temperature and pressure) or after supplying.

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

For example, as the heat source used to operate the selective reduction catalyst denitrification facility, steam (saturated steam) is used, and accordingly, the present invention requires steam (e.g., steam is required in the corresponding step through a decompression device, etc.) Saturated steam adjusted to have a temperature and pressure that is used as it is, and/or a heat source connected to a predetermined device in each stage by cooling and condensing outside air and treating with dry air heated and dried with steam (saturated steam) It is provided in each of the above steps requiring a heat source through a supply line.

Next, an embodiment of a residual molten urea purging apparatus of an ammonia reducing agent supplying facility system for implementing the method for purging residual molten urea of the ammonia reducing agent supplying facility system according to the present invention will be described in detail.

The residual molten urea purging device of the ammonia reducing agent supply facility system according to the present invention is connected in communication with the upstream side of the molten urea transfer pipe, and a heat source supply line for purging through which steam (saturated steam) as a heat source of the heat source supply unit is supplied. , A heat source control valve provided on the heat source supply line 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 powdered solid urea melting device unit 3000 do.

This residual molten urea purging device shuts down the flow path switching valve and the molten urea supply control valve through the molten urea supply control module before starting the operation of the facility system, thereby stopping the supply of molten urea, and opening the heat source control valve. By converting, steam (saturated steam) as a heat source is injected into the heat source supply line for purging, so that the molten urea transfer line (melted urea transfer line and molten urea bypass line) is returned to the powdered solid urea melting unit. In addition, by opening and closing the valves of each flow path alternately, the molten urea is discharged to the reactor unit for generating ammonia reducing agent at the same time as the return to the powdered solid urea melting unit, or sequentially. By preventing the presence of the molten urea, the molten urea does not adhere to the molten urea transfer pipe after the operation of the facility system is completed.

This molten urea purging is a heat source supply line for the flow line that constitutes the molten urea molten state maintenance device, which will be described in the system below, and depressurizes the steam (specifically, the steam that is the heat source for the facility operation). It may be carried out while supplying saturated steam adjusted to have the temperature and pressure required in the step through an apparatus or the like) or after the supply has been preceded.

In addition, the method for purging the residual molten urea is to operate the first and second molten urea pumping devices for a certain period of time before or after the start of the operation of the facility system to remove the molten urea present in the molten urea transfer pipe. It is also possible to prevent the presence of molten urea in the molten urea transfer pipe and the molten urea bypass pipe by pumping to the lea melting unit and the reactor unit for generating an ammonia reducing agent.

On the other hand, the entire ammonia reducing agent supply equipment system including the residual molten urea purging method and the purging device of the ammonia reducing agent supply equipment system according to the present invention according to the present invention as described above and the operation method thereof will be described.

Prior to the description, the solid urea described below uses a solid urea of a predetermined powder type, a granule type or a prill type of a predetermined particle diameter, and a block type of a predetermined size. In the present invention, powdery or granular solid urea is preferably used, and granular solid urea is more preferably used. Hereinafter, as solid urea, powdered solid urea and granular solid urea are collectively referred to as powdered solid urea.

First, a method of operating an ammonia reducing agent supply system for a selective reduction catalyst denitrification facility including a residual molten urea purging device according to the present invention will be described in detail with reference to FIG. 2.

2 is a flowchart schematically showing a method of operating a system for supplying an ammonia reducing agent for a selective reduction catalyst denitrification facility including a residual molten urea purging device according to the present invention.

The operation method of the ammonia reducing agent supply system system for a selective reduction catalyst denitrification facility including the residual molten urea purging device according to the present invention is an ammonia reducing agent for producing and supplying a reducing agent to be used in a selective reduction catalyst (SCR) denitration facility. As an operating method of the supply equipment system, as shown in FIG. 2, a powdery solid urea input step of injecting a powdery solid (solid state) urea to be used as an ammonia reducing agent to a powdery solid urea input device (S100) ); The powdery solid urea supply step (S200) of supplying the powdery solid urea inputted to the powdery solid urea inlet unit to the powdery solid urea supply unit to the powdery solid urea melting device unit in the powdery solid urea input step (S100) (S200) ); In the powdery solid urea supply step (S200), the powdery solid urea is supplied through the solid urea supply unit and melted through the powdery solid urea melting unit (S300); A molten urea supply step (S400) of supplying the molten urea melted in the powdery solid urea melting step (S300) to an ammonia reducing agent generating step (S500) for generating ammonia (ammonia reducing agent); Ammonia reducing agent generation step (S500) of receiving molten urea from the molten urea supply step (S400) and hydrolyzing the molten urea to generate an ammonia reducing agent to be used in a selective reduction catalyst denitrification facility (through a reactor unit for generating ammonia reducing agent) ; And an ammonia reducing agent supply step (S600) of supplying the ammonia reducing agent generated in the ammonia reducing agent generation step (S500) to a selective reduction catalyst denitrification facility (S600).

In the operating method of the ammonia reducing agent supplying facility system, a single heat source is supplied as a heat source required in each step and process of the operating method of the ammonia reducing agent supplying facility system.

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

Hereinafter, each step of the method of operating the ammonia reducing agent supply facility system will be described in detail.

Powder-type solid urea input step (S100) is a process of injecting powder-type (or granular) solid (solid state) urea (powder-type solid urea) to be used as ammonia reducing agent to the powder-type solid urea input device, Powdered solid urea of a predetermined size is injected, prevents scattering into the atmosphere of the injected solid solid urea, and prevents agglomeration of the input powdered solid urea to be supplied to the subsequent process of supplying powdered solid urea (S200). Done.

In the powdery solid urea input step (S100), a powdery solid urea to be used as an ammonia reducing agent is added, but the powdery solid urea is scattered into the atmosphere during the injection through a powdery solid urea scattering prevention device. , It is made to detect the amount of powdered solid urea to be added.

The powdery solid urea input step (S100) is performed to prevent agglomeration (aggregation) of the injected solid solid urea to smoothly provide powdery solid urea as a subsequent process.

In addition, the step of introducing the powdered solid urea (S100) may be performed so that the powdered solid urea injected by epoxy coating on the inner wall surface of the powdered solid urea input device unit can smoothly proceed to a subsequent process.

On the other hand, the powdery solid urea input step (S100) includes a powdery solid urea agglomeration prevention process to prevent agglomeration or coagulation of the powdery solid urea to be introduced.

The powdered solid urea agglomeration prevention process may be performed to prevent agglomeration of the powdered solid urea by supplying dry air to the powdered solid urea side while the powdered solid urea is added or in a state of being injected.

The powdery solid urea agglomeration prevention treatment process is, for example, external air is adjusted to have the temperature and pressure required in the step through a decompression device or the like using steam as a heat source for equipment operation (specifically, steam as a heat source for equipment operation) It may consist of injecting dry air heated and dried with saturated steam). At this time, the dry air is cooled and condensed through a refrigerant cycle unit including a cooler and a condenser, and then heated and dried with steam to be injected (through a blowing fan) into dry air without humidity (moisture). More preferable.

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

In addition, the injection of the dry air may be controlled by interlocking with the powdery solid urea vibration treatment described later.

Subsequently, the powdery solid urea agglomeration prevention treatment process, together with or alone, with the supply of dry air for preventing agglomeration of the powdered solid urea described above, when proceeding to a subsequent process after the powdery solid urea input step, to apply vibration. Can be done.

The vibration for preventing the powdery solid urea from agglomeration is, for example, through a bin activator control module that controls the operation of the bin activator by configuring a bin activator on the lower side of the powdered solid urea supply unit. It can be made to be controlled to vibrate.

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

In addition, when the above-described vibration and dry air are supplied at the same time, for example, the dry air may be introduced simultaneously with the vibration or immediately before or immediately after the vibration.

On the other hand, as another example, the powdery solid urea agglomeration prevention treatment process is composed of, alone or in combination with dry air and vibration for preventing the powdery solid urea from agglomeration, and injected or injected powdery solid urea It may further include a dehumidification treatment to remove moisture for.

The dehumidification treatment may be performed to dehumidify using steam, which is a heat source (single heat source) for operation of the facility, as a heat source required for the dehumidification treatment.

On the other hand, the powdery solid urea input step (S100) is a powdery solid urea agglomeration prevention process, and when the vibration method is applied, a vibration preventing means is used to prevent the vibration of the powdery solid urea vibration device from being transmitted to the device of a subsequent process. Can be made to prevent through.

The vibration preventing means is, for example, a bellows type connecting the hopper of the powdered solid urea supplying device part of the powdered solid urea supplying device part and the powdered solid urea supplying device part hopper of the powdered solid urea supplying device part. ) It can be made of a connecting pipe.

Next, in the powdered solid urea supply step (S200), the powdered solid urea is received from the powdered solid urea input step (S100) and quantitatively adjusted and supplied to the subsequent step, the powdered solid urea melting step (S300). Done.

In the powdery solid urea supply step (S200), the powdery solid urea is supplied from the powdery solid urea input step (S100) to the supply unit hopper, and the powdery solid urea is quantitatively adjusted to obtain powdery solid urea. It is transferred and supplied to the lea melting step (S300).

Here, the powdered solid urea supply step (S200) includes detecting (through a level sensor for detecting the amount of powdered solid urea) the amount of powdered solid urea injected into the supply unit hopper.

In addition, the powdery solid urea supply step (S200) may include a treatment capable of preventing agglomeration of the powdery solid urea as described above.

In the powdery solid urea supply step (S200), the powdery solid urea may be transferred and supplied to the powdery solid urea melting step (S300) through a screw feeder.

In addition, in the powdery solid urea supply step (S200), a quantity of powdery solid urea is supplied in accordance with the melting amount (level signal) of the powdery solid urea melting step (S300) described below.

For example, in the powdery solid urea supply step (S200), the drive motor of the powdery solid urea supply amount control device (rotary valve) according to the melting amount (level signal) of the powdery solid urea melting step (S300) and/or By controlling the operation of at least one of the driving motors of the powder-type solid urea feeder (screw feeder), a quantity of powder-type solid urea is supplied.

Next, in the powdered solid urea melting step (S300), the powdered solid urea is supplied from the powdered solid urea supply step (S200) and melted, and the melted molten urea is transferred 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, in 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 supply step (S200), and provided in the powdered solid urea melter body The powdered solid urea melter body is melted by the powdered solid urea melter heating device, and impurities contained in the molten urea are filtered out during the discharge of the melted urea from the powdered solid urea melter body. Can be done.

The powdery solid urea melting step (S300) may be performed to detect the level or level of the molten urea melted in the powdery solid urea melter body and transmit it to the integrated control panel.

In addition, the melting of the powdered solid urea in the powdered solid urea melting step (S300) passes through steam, which is a heat source, to the powdered solid urea melter heating device configured inside and outside the powdered solid urea melter body. The solid urea powder in the melter body may be melted by heating.

The heat source passes through with a temperature capable of sufficiently melting the powdery solid urea (preferably, 130°C to 150°C in consideration of the melting point of 133°C).

Here, the steam heat-exchanged while passing through the powdery solid urea melter heating device may be recovered by an external condenser, and dry air condensed externally instead of steam as the heat source may be supplied at the above temperature. .

Subsequently, the step of melting the powdered solid urea (S300) includes filtering impurities contained in the molten urea while the molten urea is discharged. Filtering of the molten urea is performed by the powdered solid urea melter body. It may be filtered by providing a metal filter net having a predetermined mesh at the lower end or on the molten urea discharge side of the powdered solid urea melter body.

Here, the step of melting the powdered solid urea (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 impurities removal because the front and rear pressure varies depending on the degree of blockage of the metal filter mesh.

In addition, the filtering of the molten urea may have a double filtering structure so as to remove impurities without interruption of the facility system even during facility operation.

That is, the filtering of the molten urea consists of a molten urea discharge line branching the lower end of the powdered solid urea melter body or the molten urea discharge port in two, a flow path switching valve at the branch, and the molten urea discharge Filtering of the molten urea in each of the lines can be achieved through a structure that can be performed.

The filtering of the molten urea in such a double (multi) structure is to be filtered by discharging it to any one of the molten urea discharge line through a flow path switching valve, and when it is necessary to remove impurities from this single molten urea discharge line. By switching the flow path switching valve and filtering while discharging it to another molten urea discharge line, it is possible to perform an impurity removal operation on the one molten urea discharge line while maintaining the operation of the facility.

Next, in the molten urea supply step (S400), the filtered molten urea is smoothly and homogeneously supplied to the ammonia reducing agent generation step (S500) for generating an ammonia reducing agent (ammonia), and the melting time of the molten urea at the start of the facility The molten urea may be supplied after returning a certain amount of molten urea for a certain period of time to shorten the urea.

Here, after the end of the molten urea supply step (S400), that is, after the facility operation is terminated, the molten urea is purged so that no molten urea remains in the transfer pipe to prevent the molten urea from sticking to the molten urea transfer pipe. . Of course, this purge process can also be carried out as a pretreatment process before starting the facility operation. This purge process will be described in detail below.

In the molten urea supply step (S400), the filtered molten urea is transferred and supplied to the ammonia reducing agent generation step (S500), but the molten urea supplied in the powdered solid urea melting step (S300) is provided under the control of the molten urea supply control module. It may include returning (or bypassing) the powdered solid urea melting step (S300) for a predetermined time after starting the system.

As described above, when the facility system is started, melting of the powdery solid urea initially melted in the powdery solid urea melting step (S300) by returning the initially melted molten urea to the powdery solid urea melting step (S300) for a predetermined time. It is possible to shorten time and increase equipment operability and efficiency.

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

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

In addition, in the molten urea supply step (S400), the detection value is less than or equal to a set value based on the detection signal (detection value) detected by a temperature sensor configured on the molten urea transfer line (preferably the upstream side transfer line). In other words, when it is determined that the melting temperature of urea is lower, the supply operation of the molten urea may be stopped.

In addition, the molten urea supply step (S400) may include accurately detecting a supply amount of molten urea in the process of transferring 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 transfer pipe, the mass flow meter is wrapped with a jacket, and a heat source (preferably, a facility operating heat source) with the jacket. Phosphorus steam (saturated steam) is supplied.

Specifically, the heat source supplied to the jacket side of the mass flowmeter is preferably made to have a temperature relatively higher than the temperature in the heat source supply line of another portion (for example, the molten urea transfer pipe 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 (reducing valve, that is, a pressure reducing valve for steam) is used to reduce the pressure so that the component has an appropriate temperature. At this time, the mass flow meter The jacketed heat source supply line that is supplied to the jacket should have a temperature higher than or equal to the heat source supplied to other components (e.g., solid urea supply unit, solid urea melting unit, molten urea supply unit, etc.). I can.

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 for facility operation has the highest temperature and pressure, and a pressure reducing device is installed in the heat source supply line to each component that executes each step and the temperature required at the step (or the component) It is supplied by reducing the pressure to have a.

In this way, in the precise detection of the amount of molten urea supplied, the temperature of the side where the mass flowmeter is installed is relatively higher than that of other locations, so that the amount of molten urea supplied to the ammonia reducing agent generation step (S500) can be more accurately measured and supplied. do.

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

Maintaining the molten urea molten state is a step in which steam (specifically, steam as a heat source for facility operation) is reduced to the heat source supply pipeline surrounding the molten urea transfer pipe and the molten urea bypass pipe through a decompression device. It may consist of supplying saturated steam adjusted to have the temperature and pressure required in

Here, the steam (saturated steam) supplied to the heat source supply pipe surrounding the molten urea transfer pipe and the molten urea bypass pipe is adjusted to an appropriate temperature and pressure to stably maintain the molten urea state. .

Next, the ammonia reducing agent generating step (S500) is made to generate ammonia (ammonia reducing agent) from molten urea through the reactor device for generating an ammonia reducing agent. For example, in the step of generating an ammonia reducing agent (S500), molten urea is supplied (eg, by spraying) into the hydrolysis chamber into which the heating fluid is introduced, and is hydrolyzed to ammonia (NH ₃ ).

Here, in the present invention, as the heat source used to generate ammonia in the ammonia reducing agent generation step (S500), steam, which is a heat source (equipment operating heat source) used for operation of the facility (specifically, steam, which is a facility operating heat source, is decompressed) It consists of a heat source based on saturated steam), which is adjusted to have the temperature and pressure required in the step.

In other words, in the step of generating ammonia reducing agent (S500), a known reactor device capable of generating ammonia (ammonia reducing agent) by receiving molten urea and hydrolyzing it may be employed, so a detailed configuration thereof will be omitted. However, in the step of generating ammonia reducing agent (S500) of the present invention, the medium required for the catalytic reaction and the heat source for heating the reaction chamber. It is characterized in that saturated steam adjusted to have the temperature and pressure required in the step) is used.

For example, in the step of generating ammonia reducing agent (S500), molten urea is injected, and a temperature at which a catalytic reaction can occur in an ammonia catalytic reaction body (or chamber) 5100 in which a catalyst for catalytic reaction with urea is provided. In order to heat by heating, saturated steam (steam) is supplied to the internal heating source (heat source supply pipe), and saturated steam is supplied to allow hydrolysis reaction with molten urea, and the internal control environment (pressure) of the ammonia catalyst reaction body , Temperature and flow rate control) to produce ammonia (ammonia reducing agent) while detecting and controlling.

The control environment is detected by detecting the pressure and temperature of the ammonia catalytic reaction body through a temperature sensor and a pressure sensor, and adjusting the internal pressure of the ammonia catalytic reaction body through a flow control device.

Next, in the ammonia reducing agent supply step (S600), the ammonia (ammonia reducing material) generated in the ammonia reducing agent generation step (S500) is fed through a supply pipe (supply pipe or supply line) without a change of state, etc., without a selective reduction catalyst (SCR). It is made to be supplied to the denitrification facility.

In the present invention, the ammonia reducing agent supply step (S600) may include a heat source supply pipe surrounding the outside of the ammonia reducing material supply pipe with a gap, and the heat source supply pipe is condensed by steam or cooling used for facility operation. Dry air heated by steam may be provided.

On the other hand, the method of operating a solid urea-based ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility according to the present invention is a catalyst (e.g., a solidified catalyst) before starting the operation of the ammonia reducing agent supply facility system (before starting operation). It may further include a catalyst melting treatment process to melt the catalyst. Of course, such a catalyst melting treatment may include performing after the operation is completed.

The catalyst melt treatment process includes saturated steam (specifically, steam as a heat source for equipment operation), which is a heat source (heat source for equipment operation) used for operation of the ammonia reducing agent supply equipment system, before operation of the ammonia reducing agent supply equipment system. It is made possible to melt the solidified catalyst by supplying saturated steam adjusted to have a required temperature and pressure) or water (for example, water having an appropriate temperature).

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

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

Such a process of melting the catalyst may be performed so that the catalyst can be melted by condensing and cooling outside air, not steam (saturated steam) itself as a heat source for facility operation, and then introducing dry air heated with steam as a heat source for facility operation.

In addition, the method of operating a solid urea-based ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility according to the present invention is a transfer pipe through which molten urea is supplied after or at the end of operation of the ammonia reducing agent supply facility, specifically, molten urea. It may further include a molten urea purging process of removing or purging molten urea remaining in the conveying pipe through which the is transferred and the bypass pipe being returned (bypassed).

The molten urea purging process is an embodiment, for example, before or after the operation of the ammonia reducing agent supply facility, operating the facility upstream of the molten urea transfer line (including the molten urea transfer line and the molten urea bypass line) through which molten urea is transferred. Steam as a heat source (specifically, saturated steam adjusted to have the required temperature and pressure through a decompression device, etc.) is injected into the molten urea transfer pipe (melted urea transfer pipe). The remaining molten urea is recovered to the solid urea melting unit that performs the solid urea melting step and/or is discharged to the ammonia reducing agent generating unit that performs the ammonia reducing agent generation step, so that the molten urea transfer pipe (melted urea transport pipe) It can be made to remove the molten urea remaining in the. The purging of the molten urea can be performed simultaneously or sequentially with the recovery to the solid urea melting apparatus unit side and discharge to the ammonia reducing agent generating unit side by selectively opening and closing a valve provided on the flow path.

At this time, the molten urea purging process is a heat source supply line surrounding the molten urea transfer pipe with a gap, and the steam (specifically, steam, which is the heat source for facility operation, is reduced to a decompression device, etc.). It can also be carried out while supplying saturated steam adjusted to have the temperature and pressure required in the step) or after the supply has been preceded.

In addition, the molten urea purging process may be performed by pumping the molten urea in the molten urea transfer pipe (melted urea transfer pipe and the molten urea bypass pipe) (pumping for a certain time) to perform a powdery solid urea melting step (S300). It may be recovered to the side of the solid urea melting device to be executed, and discharged to the ammonia reducing agent generating device part for executing the ammonia reducing agent generating step (S500). Even in this case, steam, which is the heat source (heat source for facility operation) of the heat source supply unit, as a heat source supply line that surrounds the molten urea transfer pipeline with a gap (specifically, steam, which is the heat source for facility operation, is required at the step through a decompression device, etc.) It may be carried out while supplying saturated steam adjusted to have a temperature and pressure) or after supplying.

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

For example, the heat source used to operate the selective reduction catalyst denitrification facility is typically steam (saturated steam). Accordingly, the present invention provides steam (e.g., steam is reduced to the corresponding step through a decompression device, etc.) Saturated steam adjusted to have the required temperature and pressure) is used as it is, and/or the outside air is cooled and condensed and treated with dry air heated and dried with steam (saturated steam) and connected to a predetermined device at each stage. It is provided in each of the above steps requiring a heat source through the heat source supply line. Of course, as a medium for hydrolysis with the catalyst in the ammonia reducing agent generation step (S500), saturated steam (saturated steam adjusted to have the temperature and pressure required in the step through a decompression device, etc.) Is used.

Next, an ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility including the residual molten urea purging device according to the present invention will be described in detail with reference to FIGS. 3 to 7.

3 is a configuration diagram showing the overall configuration of an ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility including a residual molten urea purging device according to the present invention, and FIG. 4 is a configuration diagram including a residual molten urea purging device according to the present invention. A diagram showing the configuration of a powdery solid urea supply unit constituting the ammonia reducing agent supply system system for a selective reduction catalyst denitrification facility, and FIG. 5 is a selective reduction catalyst including a residual molten urea purging device according to the present invention. It is a figure which shows the structure of the powdery solid urea melting apparatus which comprises a supply equipment system. 6 is a configuration diagram showing the configuration of a melting device unit and a molten urea supply unit of an ammonia reducing agent supply system system including a residual molten urea purging device according to the present invention, and Fig. 7 is a configuration diagram showing the residual molten urea purging apparatus according to the present invention. It is a diagram showing the configuration of an ammonia reducing agent supplying device part constituting the ammonia reducing agent supplying system system for a selective reduction catalyst denitrification facility including.

The ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility including the residual molten urea purging device according to the present invention is a selective reduction catalyst (SCR: Selective Catalytic Reduction) ammonia reducing agent supply facility system for producing and supplying a reducing agent to be used in the denitrification facility. As shown in FIGS. 3 to 7, powdery solid cows into which solid (solid state) urea in powder form or granular form (hereinafter, collectively referred to as powder form) as a material to be used as an ammonia reducing agent is injected. Lea input device unit 1000; A powdery solid urea supply device 2000 configured to supply the powdery solid urea injected into the powdery solid urea injector unit 1000 to the following powdery solid urea melting device 3000; A powder-type solid urea melting device (3000) configured to receive and melt powder-type solid urea from the powder-type solid urea supply device (2000); A molten urea supply unit 4000 configured to supply the molten urea melted in the powdered solid urea melting unit 3000 to the reactor unit 5000 for generating an ammonia reducing agent; A reactor device 5000 for generating an ammonia reducing agent configured to generate an ammonia reducing agent to be used in a selective reduction catalyst denitrification facility by receiving the molten urea through the molten urea supply unit 4000 and performing a hydrolysis reaction; An ammonia reducing agent supply unit 6000 for supplying the ammonia reducing agent generated by the ammonia reducing agent generating reactor unit 5000 to a selective reduction catalyst denitrification facility; And a heat source supply device unit configured to supply a heat source to a device unit requiring a heat source among the respective device units.

Hereinafter, each of the components constituting the system for supplying ammonia reducing agent based on solid urea for a selective reduction catalyst denitrification facility according to the present invention will be described in detail.

Powder type solid urea input device (1000)

The powdery solid urea input device 1000 is a powder that is a subsequent device by preventing the powdery solid urea of a predetermined size from scattering into the atmosphere of the powdery solid urea to be injected, and preventing the agglomeration of the injected solid solid urea. It is configured to supply to the type solid urea supply device (2000).

As shown in FIG. 5, the powdered solid urea input device unit 1000 includes a large input device part hopper 1100, a powdered solid urea scattering prevention device 1200, and a powdered solid urea agglomeration preventing means. do.

Specifically, the powdered solid urea input device 1000 includes: an input device part hopper 1100 into which powdered solid urea to be used as an ammonia reducing agent is injected; A powdery solid urea scattering prevention device 1200 for preventing scattering into the atmosphere when the powdery solid urea is put in the upper side of the hopper 1100; And configured to smoothly provide powdered solid urea to the powdered solid urea supply unit 2000 by preventing agglomeration (agglomeration) of the powdered solid urea that is provided at the lower side of the input device unit hopper 1100. It may be configured to include; means for preventing agglomeration of solid urea powder.

The input device part hopper 1100 is formed in a normal hopper shape, for example, a cylindrical body part 1110 and a funnel-shaped funnel part integrally formed under the cylindrical body part 1110 It may be made of (1120).

The cylindrical body portion 1110 is provided with a level sensor 1111 for detecting an input amount at the upper and lower sides thereof to detect the input amount of the powdered solid urea.

Here, the level sensor 1111 for detecting the input amount may be configured in an electronic or mechanical type, and is specially limited as long as it can detect or detect the input amount of the powdered solid urea injected into the input unit hopper 1100 It does not become.

It is preferable that the inner wall surface of the funnel part 1120 is coated with epoxy. In this way, the funnel part 1120 minimizes the frictional force with the powdered solid urea by coating the inner wall of the funnel with epoxy so that the powdered solid urea can proceed smoothly and quickly to the lower side. Of course, the above-described 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 include a scattering prevention device 1200 and a powder-type solid urea agglomeration preventing means, which will be described later, but are not limited thereto.

Subsequently, the powdery solid urea scattering prevention device 1200 is provided on the upper side of the input device part hopper 1100, that is, the upper end of the body part 1110 of the input device part hopper 1100 to scatter powder. It may be composed of a bag filter device that collects solid urea.

Here, the bag filter device, which is the powdery solid urea scattering prevention device 1200, is configured such that the opening end of the air outlet is opened downward to prevent the inflow of water in rainy weather, and to prevent agglomeration of the powdery solid urea A wet air removing means configured to prevent or remove the introduction of wet air may be configured.

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

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

In addition, it is preferable that the bag filter device is provided with a filter member of a pleated pipe type.

Next, the powdery solid urea agglomeration preventing means is a powdery solid urea agglomeration that prevents agglomeration of the powdery solid urea injected into the input device hopper 1100 by supplying dry air to the input device part hopper 1100 It includes a dry air supply device for prevention.

The dry air supply device for preventing agglomeration of powdered solid urea supplies a refrigeration cycle unit including a cooler and a condenser configured to cool and condense external air, and a heat source to be described in detail below with the air cooled in the refrigeration cycle unit. A heat exchange unit receiving and heating steam (saturated steam) as a heat source of the device unit, a dry air control module unit controlling a supply amount of dry air heated by heat exchange in the heat exchange unit, and the supply unit hopper 1100 And one or more dry air ejection units 1300 provided on the lower side of the unit and configured to eject air heated by the heat exchange unit.

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

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

In addition, control of the supply amount of dry air of the control module unit may be controlled by interlocking with a vibration device for preventing agglomeration of powdery solid urea, which will be described later.

Subsequently, the means for preventing agglomeration of the powdered solid urea is provided at the lower side of the supply unit hopper 1100 together with or alone with the supply of the dry air for preventing the agglomeration of the powdered solid urea described above and configured to apply vibration. It may include a vibration device 1400 for preventing agglomeration of powdered solid urea.

The vibration device 1400 for preventing agglomeration of the powdered solid urea controls the operation of, for example, a bin activator 1410 configured at the lower side of the supply unit hopper 1100, and the bin activator. It may be configured to include a bin activator control module unit 1420. Reference numeral 1411 denotes a motor that provides driving force to the empty activator.

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

In addition, when the bin activator control module unit 1420 is configured with the configuration for supplying dry air for preventing agglomeration of powdered solid urea, the vibration device 1400 for preventing agglomeration of powdered solid urea In connection with the dry air control module unit to control the supply of dry air, for example, it may be interlocked so that dry air is injected at the same time as or immediately after the vibration.

Here, when the vibration device 1400 for preventing agglomeration of powdered solid urea is configured together with the dry air supply device for preventing agglomeration of powdered solid urea described above, the empty activator control module unit 1420 and the dry air control module unit It can be composed of an integral control panel or control module.

On the other hand, as another example, the means for preventing agglomeration of the powdered solid urea may be combined with or alone or in combination with the dry air supply device for preventing agglomeration of the powdered solid urea and the vibration device 1400 for preventing agglomeration of the powdered solid urea. It is configured, and may include a dehumidifying device for removing moisture in the supply unit hopper (1100).

Since such a dehumidifying device may employ a known configuration and operation method, a detailed description thereof will be omitted. However, the heat source required by the dehumidification device is steam (specifically, steam as a heat source for facility operation), which is a heat source (heat source for facility operation) of the heat source supply unit, which will be described in detail below, through a decompression device, etc. It is to use saturated steam adjusted to have the temperature and pressure required in

In addition, when the powder-type solid urea injector unit 1000 is configured as the powder-type solid urea agglomeration prevention vibration device 1400 as the powder-type solid urea agglomeration prevention means, the powder-type solid urea agglomeration prevention vibration device (1400) ) To prevent the vibration (vibration of the injection unit hopper 1100) from being transferred to the supply unit hopper 2100 of the powder type solid urea supply unit 2000 to be described later. ) And a vibration preventing means provided between the powdered solid urea supply unit 2000 may be further included.

The vibration preventing means is, for example, a powder-type solid urea supply device of the powder-type solid urea input device part hopper 1100 of the powder-type solid urea input device part 1000 and the powder-type solid urea supply device part 2000 A connection pipe connecting the sub hopper 2100 may be configured as a bellows type pipe.

Powder type solid urea supply device (2000)

The powdered solid urea supply unit 2000 receives and quantitatively controls the powdered solid urea from the powdered solid urea input unit 1000 and supplied to the subsequent unit, the powdered solid urea melting unit 3000. Is configured to

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

Specifically, the powdery solid urea supply unit 2000 includes: a supply unit hopper 2100 receiving powdery solid urea from the powdery solid urea input unit 1000; It is provided at the upper end of the supply unit hopper 2100 and configured to quantitatively adjust the powdered solid urea supplied from the powdered solid urea input unit 1000 to be injected into the supply unit hopper 2100. Powder-type solid urea supply amount control device 2200; Powdered solid urea is provided in communication with the lower end of the supply unit hopper 2100 to transfer and supply powdered solid urea from the supply unit hopper 2100 to the powdered solid urea melting unit 3000 Device 2300; And controlling the operation of the powder-type solid urea supply amount control device 2200 and/or the powder-type solid urea transfer and supply device 2300 to control the operation of the powder-type solid urea to be supplied to the powder-type solid urea melting device unit 3000. It may be configured to include a; powder-type solid urea supply unit control module unit 2400 configured to control the supply amount.

The supply unit hopper 2100 is formed in a conventional hopper shape, for example, a cylindrical body part 2110, and a funnel-shaped funnel part integrally formed under the cylindrical body part 2110 It can be made of (2120).

The cylindrical body portion 2110 is provided with a level sensor 2111 for detecting an input amount at an upper side and a lower side thereof so as to detect an input amount of the powdered solid urea.

Here, the level sensor 2111 for detecting the input amount may be configured in an electronic or mechanical type, and is specially limited as long as it can detect or detect the input amount of the powdered solid urea injected into the supply unit hopper 2100 It does not become.

Also in the supply unit hopper 2100, the inner wall surface of the funnel unit 2120 is preferably coated with epoxy. In this way, the inner wall of the funnel 2120 is coated with epoxy, thereby minimizing the frictional force with the powdered solid urea so that the powdered solid urea can proceed smoothly and quickly to the lower side. Of course, the above-described epoxy coating (layer) may also be formed on the inner wall surface of the cylindrical body part 2110.

In addition, the supply unit hopper 2100 may be provided with a means for preventing agglomeration of powdery solid urea as described above.

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

In addition, the powdered solid urea transfer and supply device 2300 may be configured as a screw feeder at one end of which is connected in communication with the supply unit hopper 2100 and has a transfer screw 2310 therein. . Reference numeral 2320 denotes a driving motor for rotationally driving the transfer screw 2310.

Next, the powder-type solid urea supply unit control module unit 2400 is a drive motor 2210 of the powder-type solid urea supply amount control device 2200 and/or of the powder-type solid urea transfer supply device 2300 It is configured to control the operation of the driving motor 2320 to control the supply amount of the powdered solid urea supplied to the powdered solid urea melting apparatus unit 3000.

That is, the powdered solid urea supply unit control module unit 2400 is configured to supply a quantity of powdered solid urea according to the melting amount (level signal) of the powdered solid urea melting unit 2300 described in detail below. The drive motor 2210 of the powdery solid urea supply amount control device 2200 and/or the drive motor 2320 of the powdery solid urea transfer supply device 2300 (screw feeder which is a powdery solid urea transfer supply device)) It is made to control at least one of the operations.

In other words, the powdered solid urea supply unit control module unit 2400 is a molten urea level measuring the melt level (melting level) in the powdered solid urea melter body constituting the powdered solid urea melting device unit 2300 In response to a signal from the sensor 3110, the driving motor 2210 of the powdery solid urea supply amount control device 2200 and/or in proportion to the consumption amount of the molten urea or at a set cycle while monitoring the melt level in the powdery solid urea dissolving device It may be configured to control the number of rotations of at least one of the drive motors 2320 of the powdered solid urea transfer supply device 2300.

Powder type solid urea melting device (3000)

The powdered solid urea melting unit 3000 receives and melts the powdered solid urea from the powdered solid urea supply unit 2000, and delivers 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 melting device unit 3000 includes a powdered solid urea melter body 3100, a powdered solid urea melter heating device 3200, and molten urea filtering. It may be configured to include the device 3300.

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

The powdered solid urea melter body 3100 is formed in the shape of a cone or hopper of the upper gwang-low narrow side, and is used to detect the level or level of the molten urea melted in the powdered solid urea melter body 3100 at one or more locations. A molten urea level sensor 3110 is configured.

Here, the molten urea level sensor 3110 may be configured in an electronic or mechanical type, and 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 path connector 3101 to which a molten urea bypass flow path device 4200 constituting a molten urea bypass pipe to be described later is connected is formed on one side of the powdered solid urea melter body 3100.

Subsequently, the powder-type solid urea melter heating device 3200 is composed of a heat exchange pipe made of a conductive material having a spiral pipe and provided inside the powder-type solid urea melter body 3100, one end of which is the molten urea melter. It penetrates through the upper side of the body 3100 and the other end is configured to penetrate the lower side of the molten urea meter body 3100.

The powdered solid urea melter heating device 3200 is heated while passing through the heat exchange pipe as a heat source of the heat source supply unit to be described in detail below, and the powdered solid urea melter body 3100 It melts the powdery solid urea inside.

The heat source passes through with a temperature capable of sufficiently melting the powdery solid urea (preferably, 130°C to 150°C in consideration of the melting point of 133°C).

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

In addition, instead of steam as the heat source, dry air obtained by condensing and cooling external air and then heating with steam (saturated steam) may be supplied at the temperature described above. Here, the steam or dry air may be supplied to the powdery solid urea melter heating device 3200 after passing through the filtering device 3300.

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

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

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

Next, the molten urea filtering device 3300 is composed of a filtering device capable of removing impurities contained in the molten urea, but it is preferable to be made of a material that is not deformed while sufficiently withstanding the temperature at which the powdered solid urea is melted. .

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

In addition, the powdery solid urea melting device 3000 may further include an impurity detection device for detecting whether the molten urea filtering device 3300 has removed impurities.

The impurity detection device may include, for example, a pressure sensor provided on the front side and the rear side of the molten urea filtering device 3300 and transmitting a detection signal to the integrated control panel. Accordingly, the molten urea filtering device 3300 Since the front and rear pressures vary depending on the degree of clogging by impurities, the timing of removing impurities of the molten urea filtering device 3300 can be monitored.

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

Specifically, the lower end of the powdered solid urea melter body 3100 or the molten urea discharge port comprises a molten urea discharge line branched into two, and a flow path switching valve is configured at the branch part, and each molten urea The melting urea filtering device 3300 is provided in the discharge line.

Here, the molten urea filtering device 3300 is provided with the above-described impurity detection device, respectively.

When the molten urea filtering device 3300 is configured in a plurality as described above, filtering is performed only through one of the molten urea filtering device 3300 through the flow path switching valve, and impurities of the molten urea filtering device 3300 are removed. When it is necessary to perform the impurity removal operation for the one molten urea filtering device 3300, while maintaining the facility operation by switching to the other molten urea filtering device 3300 with a flow path switching valve. do.

Molten urea supply unit (4000)

The molten urea supply unit 4000 smoothly and homogeneously supplies the molten urea melted and filtered by impurities 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 molten urea when starting the facility, and in addition to this, it is transferred by purge to remove molten urea without remaining in the transfer pipe (melted urea transfer pipe and molten urea bypass pipe) before and after operation of the equipment. It is configured to prevent the molten urea from sticking to the pipeline.

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

Specifically, the molten urea supply unit 4000 has one end connected to the molten urea outlet (melted urea discharge) side of the powdered solid urea melting unit 3000, and the other end is connected to the reactor unit 5000 A molten urea transfer pipe 4100 connected; A molten urea bypass conduit 4200 branched at a predetermined point of the molten urea transfer conduit 4100 and connected to the bypass flow channel connector 3101 of the powdered solid urea melting apparatus unit 3000; A flow path switching valve 4300 provided at a branch point at which the molten urea bypass pipe 4200 is branched; One or more molten urea pumping devices 4410 and 4420 provided on the upstream side and downstream side of the molten urea transfer pipe 4100 based on the flow path switching valve 4300 to pump molten urea to the reactor unit 5000 side. ); A molten urea supply amount detecting device configured to detect a supply amount of molten urea supplied by being configured in the molten urea transfer pipe 4100 based on the flow path switching valve 4300; And a molten urea supply control module unit configured to control the operation 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 transfer pipe 4100 is composed of a connection pipe connecting the molten urea outlet (melted urea discharge) side of the powdered solid urea melting apparatus unit 3000 and the reactor unit 5000 side, and other components And since it is a component closely related to the molten urea purging device 4500 and/or the molten urea molten state maintenance device 4600 to be described in detail below, it is preferable to be made of a metal material having good thermal conductivity (high). .

Subsequently, the molten urea bypass conduit 4200 is a powder-type solid urea melting apparatus unit by switching the flow path switching valve 4300 provided at the branch point under the control of the molten urea supply control module unit ( 3000) is returned to the powdery solid urea melting apparatus unit 3000 for a certain period of time after the initial start-up (that is, the initial molten urea is recovered).

As described above, when starting the operation of the facility system, the molten urea initially melted is returned (recovered) toward the powdered solid urea melting device 3000 for a predetermined time, so that it is initially melted in the powdered solid urea melting device 3000. It is possible to shorten the melting time of powdery solid urea and increase the operability and efficiency of equipment.

Next, the molten urea pumping device (4410, 4420) is a first molten urea pumping device (upstream side pumping device) configured on the upstream side of the molten urea transfer pipe (4100) based on the flow path switching valve (4300). 4410, and a second molten urea pumping device (downstream side 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 (in the present invention, the heat source of the heat source supply unit A heat source (heat source that decompressed the steam; 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 when the operation is terminated or stopped. It can be prevented from becoming.

Subsequently, the molten urea supply amount detection device is provided on the downstream side of the molten urea transfer pipe 4100 based on the flow path switching valve 4300, and a molten urea supply amount detection sensor (flow rate sensor) for detecting the supply amount of molten urea. , 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 molten urea by changing an open degree, the The molten urea supply control module unit is configured to receive a detection signal (detection value) detected by the molten urea supply quantity detection sensor and control the opening degree of the molten urea supply quantity 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 based on the flow path switching valve 4300 The molten urea temperature detection sensor further comprises, 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 less than a set value, preferably, melting of urea When it is determined to be below the temperature, it is preferable that the operation of the molten urea pumping device, that is, the operation of the molten urea pumping device 4410 on the upstream side of the flow path switching valve 4300 is stopped.

Meanwhile, the molten urea supply unit 4000 removes the molten urea remaining in the molten urea transfer line 4100 and the molten urea bypass line 4200 after the equipment operation is terminated, or It may further include a molten urea purging device 4500 configured to purging.

The molten urea purging device 4500 is connected in communication with the upstream side of the molten urea transfer pipe to supply steam (saturated steam), which is a heat source of the heat source supply unit, a heat source supply line 4520 for purging, and the heat source supply A heat source control valve 4530 provided on the line 4520 and configured to control the supply of a heat source, and a molten urea supply control valve provided on the discharge side of the powdered solid urea melting device 3000 (not shown) Includes.

The molten urea purging device 4500 shuts down the flow path switching valve 4300 and the molten urea supply interruption valve through the molten urea supply control module unit before starting the operation of the facility system, thereby stopping the supply of molten urea, The heat source isolating valve 4530 is opened and the heat source steam (saturated steam) is injected into the purging heat source supply line 4520, and the molten urea transfer line (melted urea transfer line 4100 and the molten urea bypass line 4200) ) Not only to return the molten urea present in the powdered solid urea melting unit 3000 to the side of the powdered solid urea melting unit 3000, but also to alternately open and close the valves of each flow channel to return to the powdered solid urea melting unit 3000 Simultaneously or sequentially, it is discharged to the reactor unit 5000 for generating ammonia reducing agent so that molten urea does not exist in the molten urea transfer line, so that the molten urea does not adhere to the molten urea transfer line after the operation of the facility system is terminated. .

This molten urea purging is a heat source supply line 4510 for a flow line constituting a molten urea molten state maintenance device 4600, which will be described later, and steam (specifically, a facility operating heat source). Steam may be supplied through a decompression device or the like while supplying saturated steam adjusted to have the temperature and pressure required in the step) or after the supply is preceded.

In addition, the purging of the molten urea is performed by operating the first and second molten urea pumping devices (4410, 4420) for a certain period of time before or after the operation of the facility system is started to remove the molten urea present in the molten urea transfer pipe. It is also possible to prevent the presence of molten urea in the molten urea transfer pipe 4100 and the molten urea bypass pipe 4200 by pumping it to the powdered solid urea melting unit 3000 and the reactor unit 5000 for generating 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 molten urea supplied from the molten urea transfer pipe 4100.

The molten urea supply amount precision detection device 4700 is a downstream side of the molten urea transfer pipe 4100 (more preferably a downstream side of the molten urea pumping device 4420) based on the flow path switching valve 4300 A mass flowmeter 4710 configured in, a jacket surrounding the mass flowmeter 4710, and a heat source supply line for a mass flow meter supplying steam (saturated steam) that is a heat source of the heat source supply unit to the jacket. The jacket constitutes a component of the molten urea molten state maintaining apparatus 4600, which will be described later.

Here, the heat source supplied to the jacket side of the mass flowmeter 4710 is made to have a temperature relatively higher than the temperature in the heat source supply line of another part (for example, the molten urea transfer pipe or the molten urea transfer line side). desirable. That is, in supplying the steam, which is the heat source for operation of the facility, to each component, a pressure reducing device (reducing valve, that is, a pressure reducing valve for steam) is used to reduce the pressure so that the component has an appropriate temperature. At this time, the mass flow meter ( The jacket heat source supply line supplied to the jacket of 4710) is the same as or relative to the heat source supplied to other components (e.g., 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, in the present invention, the heat source uses steam (saturated steam) used to operate the entire facility. At this time, steam, which is a heat source supply source, has the highest temperature and pressure, and a decompression device is installed in the heat source supply line to each device unit, and the pressure is decompressed so that the temperature required by the device unit is supplied.

As described above, in the molten urea supply amount precision detection device 4700, the temperature of the heat source supplied to the side where the mass flow meter 4710 is installed is relatively higher than that of other locations, thereby producing ammonia reducing agent melting supplied to the reactor unit 5000. It is made to be able to supply by measuring the supply amount of urea more precisely.

In addition, in the present invention, the molten urea supply unit 4000 maintains the molten urea molten state, which is configured to stably maintain the molten state of the molten urea moving along the molten urea transfer pipe (melted urea transfer pipe 4100). It may further include a device 4600.

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

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

Reactor unit for generating ammonia reducing agent (5000)

The reactor unit 5000 for generating an ammonia reducing agent is a reactor unit unit that generates molten urea supplied through the molten urea supply unit 4000, and decomposes urea into ammonia through the urea hydrolysis unit 5100 and It is configured to supply ammonia as a reducing agent to the SCR denitrification plant.

The reactor device unit 5000 for generating an ammonia reducing agent includes a known urea hydrolysis device, and is composed of a reactor device unit for generating ammonia by hydrolyzing urea through it, wherein the reactor device unit 5000 for generating ammonia reducing agent 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 (that is, the temperature and pressure required for generating ammonia reducing agent through a decompression device, etc. Heat source adjusted to have a).

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

For example, the reactor unit 5000 for generating an ammonia reducing agent includes an ammonia-catalyzed reaction body in which molten urea is injected, and a catalyst for catalytic reaction with urea is provided, and a catalytic reaction is performed inside the ammonia-catalyzed reaction body. An ammonia-catalyzed reaction body heating device that is heated to a possible temperature and heated by steam (saturated steam) as a heat source of the heat source supply unit, and steam to cause a gas decomposition reaction with a catalyst provided inside the ammonia catalyst reaction body ( A reactor heat source supply line to which saturated steam is provided, and a reactor detection device(s) configured to detect and control an internal control environment (pressure, temperature and flow rate control) of the ammonia-catalyzed reaction body.

The reactor detection device includes a temperature sensor and a pressure sensor capable of detecting the pressure and temperature of the ammonia catalytic reaction body, and a flow control device configured to adjust the internal pressure of the ammonia catalytic reaction body.

Here, the ammonia reducing agent generating reactor device unit 5000 performs a catalyst melting treatment such that the catalyst (for example, the solidified catalyst) is melted at the start or end of the operation of the ammonia reducing agent supply system.

The catalyst melt treatment requires saturated steam (specifically, steam as a heat source for facility operation), which is a heat source (heat source for facility operation) used for operation of the ammonia reducing agent supply facility, before the operation of the ammonia reducing agent supply facility system, through a decompression device, etc. The solidified catalyst can be melted by either supplying saturated steam adjusted to have a temperature and pressure to be used, or by providing water (eg, water having an appropriate temperature).

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

The solid urea-based ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility according to the present invention can make the operation of the ammonia reducing agent generating reactor device unit 5000 more reliable through the melting treatment of the catalyst.

The catalyst melting treatment may be configured to melt the catalyst by condensing and cooling external air, not steam (saturated steam) as a heat source for facility operation, and then introducing dry air heated with steam as a heat source for facility operation.

Ammonia reducing agent supply unit (6000)

The ammonia reducing agent supply unit 6000 is a supply pipe (supply pipe) capable of supplying the ammonia (ammonia reducing material) generated by the ammonia reducing agent generation reactor unit 5000 to the selective reduction catalyst (SCR) denitrification facility without a change in state, etc. Or a supply line).

In the present invention, the ammonia reducing agent supply unit 6000 may be configured with a heat source supply pipe for supplying an ammonia reducing agent surrounding the outer side of the supply pipe with a gap, and the heat source supply pipe for supplying the ammonia reducing agent includes a heat source supply unit A heat source supply line capable of providing dry air of a predetermined temperature heated with steam by cooling condensation or cooling condensation of steam as a heat source (steam adjusted to an appropriate temperature through a decompression device installed in the heat source supply line, etc.) will be constructed. May be.

Heat source supply unit

Next, the heat source supply unit unit 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 apparatus units requiring a heat source. It may consist of a heat source supply line.

For example, the heat source used to operate the selective reduction catalyst denitrification facility is usually steam (saturated steam). Accordingly, in the present invention, steam is used as it is or cooled and condensed and dried air heated with steam is used in each device. It is provided to each of the above-described device units requiring a heat source through a heat source supply line connected to the unit.

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

The steam may be generated by heating a steam source using waste heat from a generator or generator pipe.

As described above, the molten urea supply device of the ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility based on solid urea according to the present invention, its supply operation method, and ammonia reducing agent supply facility system for a selective reduction catalyst denitrification facility including the same According to the system, it is possible to improve the maintainability of the facility by preventing the molten urea from melting solid urea from sticking to the flowing transfer pipe during the startup and shutdown of the facility as well as during the operation of the facility, and to prevent facility errors or failures. In addition, since the molten urea does not crystallize in the transfer pipe, it is possible to prevent malfunctions of various valves and mass flow controllers (MFC) installed in the molten urea supply line, thereby securing facility stability.

In addition, the present invention uses a powdered or granular solid urea as a base raw material as the ammonia reducing agent to be generated in the ammonia reducing agent supply system, while using the molten urea in which the solid urea is melted more smoothly and efficiently through a subsequent device or a subsequent process. It can be supplied and can be supplied to the selective reduction catalyst (SCR) denitrification facility by producing a continuous, efficient and homogeneous ammonia reducing agent from the ammonia reducing agent supply facility system, thereby increasing overall facility operability and economics, and checking the ammonia reducing agent facility system There is an advantage of increasing the maintainability of the facility system by allowing the ammonia reducing agent to be produced and supplied quickly and smoothly after the operation is stopped.

In addition, the present invention can quickly and easily recover or transfer the molten urea remaining in the molten urea flow line to the urea melting unit and/or the ammonia reducing material generating unit, thereby increasing the utility of urea and melting It can prevent crystallization and blockage in the urea flow line, insert and store solid urea in powder or granular form without clumping during the supply process, indirectly heat and melt solid urea, and undergo a circulation process in the supply process. By doing so, it is possible to prevent self-polymerization, so that supply stability can be secured, and by using catalytic hydrolysis, the rapid response of the load fluctuation reaction time is improved, and the amount of ammonia produced and the reaction rate can be easily controlled.

Although the above-described embodiments have been described by the limited drawings, a person of ordinary skill in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

The embodiments described in the present specification and the accompanying drawings are merely illustrative of some of the technical ideas included in the present invention. Accordingly, it is obvious that the embodiments disclosed in the present specification are not intended to limit the technical idea of the present disclosure, but to explain the technical idea, and thus the scope of the technical idea of the present disclosure is not limited by these embodiments. Modification examples and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be interpreted as being included in the scope of the present invention.

1000: powder type solid urea input device unit
1100: input device hopper
1110: cylindrical body
1111: level sensor for detecting the input amount
1120: funnel-shaped funnel portion
1200: powder type solid urea scattering prevention device
1300: dry air jet
1400: Vibration device for preventing aggregation of powdery solid urea
1410: bin activator
1411: empty activator drive motor
1420: bin activator control module unit
2000: Powder type solid urea supply device
2100: supply unit hopper
2110: cylindrical body
2111: level sensor for detecting the input amount
2120: funnel-shaped funnel portion
2200: powder type solid urea supply amount control device
2210: drive motor of the device for controlling the supply amount of solid urea powder
2300: powder type solid urea transfer and supply device
2310: transfer screw
2320: drive motor of transfer screw
2400: powder type solid urea supply unit control module unit
3000: powder type solid urea melting device unit
3100: powdery solid urea melter body
3101: bypass channel connection
3110: molten urea level sensor
3200: powder type solid urea melter heating device
3300: molten urea filtering device
4000: molten urea supply unit
4100: molten urea transfer pipe (first molten urea transfer pipe)
4200: molten urea bypass device (second molten urea transfer pipe)
4300: Euro switch valve
4410: first molten urea pumping device
4420: second molten urea pumping device
4500: molten urea purging device
4510: purging line
4520: heat source supply line
4530: heat source shutoff valve
4600: molten urea molten state maintenance device
4710: mass drift system
4700: Molten urea supply amount precise detection device
5000: reactor device part for generating ammonia reducing agent
5100: hydrolysis device
6000: ammonia reducing agent supply unit
S100: powdered solid urea input step
S200: Step of supplying powdered solid urea
S300: powdered solid urea melting step
S400: molten urea supply step
S500: ammonia (ammonia reducing agent) production step
S600: ammonia reducing agent supply step

Claims (7)

As a method for purging residual molten urea in an ammonia reducing agent supply facility system for purging residual molten urea in a molten urea transfer pipe,
The molten urea transfer pipeline to the solid urea melting unit that melts urea by injecting a purging medium from the upstream side of the molten urea transfer pipe through which the molten urea is transferred, or to the ammonia reducing agent generating unit that generates ammonia reducing agent by receiving the molten urea. It consists of allowing the residual molten urea to be discharged,
The purging medium is steam, which is a heat source for equipment operation.
Method for purging residual molten urea in ammonia reducing agent supply system.
delete As a method of operating an ammonia reducing agent supply facility system to produce and supply a reducing agent to be used in a selective reduction catalyst (SCR) denitrification facility,
It characterized in that it comprises the residual molten urea purging method of the ammonia reducing agent supply equipment system according to claim 1
How to operate ammonia reducing agent supply equipment system.
delete As the residual molten urea purging device of the ammonia reducing agent supply facility system for purging the residual molten urea in the molten urea transfer pipe connected to the molten urea outlet side of the solid urea melting unit that receives and melts the solid urea,
The residual molten urea purging device,
A heat source supply line for purging that is connected in communication with an upstream side of the molten urea transfer pipe to supply a heat source for facility operation;
A molten urea bypass pipe branched at a predetermined point of the molten urea transfer pipe and connected to the solid urea melting apparatus unit;
A flow path switching valve provided at a branch point at which the molten urea bypass pipe is branched;
A heat source control valve provided in the purging heat source supply line and configured to control the supply of the heat source; And
Molten urea supply interruption valve provided on the discharge side of the solid urea melting device from which molten urea is discharged
The residual molten urea purging apparatus of the ammonia reducing agent supply equipment system comprising a.
An ammonia reducing agent supply facility system comprising the residual molten urea purging device according to claim 5.
The method of claim 6,
The ammonia reducing agent supply facility system,
A molten urea pumping device provided on an upstream side and a downstream side of the molten urea conveying pipe based on the flow path switching valve;
A molten urea supply amount detecting device configured to detect a supply amount of molten urea supplied by being configured in the molten urea transfer pipe based on the flow path switching valve; And
And a molten urea supply control module configured to control the operation of the flow path switching valve, the molten urea pumping device, and the molten urea supply amount detecting device;
Ammonia reducing agent supply equipment system.

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