CN211146538U - Flue gas heating device and system - Google Patents
Flue gas heating device and system Download PDFInfo
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- CN211146538U CN211146538U CN201922026429.9U CN201922026429U CN211146538U CN 211146538 U CN211146538 U CN 211146538U CN 201922026429 U CN201922026429 U CN 201922026429U CN 211146538 U CN211146538 U CN 211146538U
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Abstract
The utility model discloses a flue gas heating device, include: the heating furnace is arranged beside the flue, the hot air mixing pipe is arranged in the flue, one end of the hot air mixing pipe extends out of the flue and is connected with the heating furnace, and holes which are uniformly distributed are formed in the part, located in the flue, of the hot air mixing pipe. The utility model also discloses a flue gas heating system, which comprises the flue gas heating device, and comprises two heating furnaces which are oppositely arranged at the two sides of the flue, and a hot air mixing pipe which runs through the two sides of the flue and is connected with the two heating furnaces; the combustion gas source and the combustion-supporting fan are matched, and the matched pipeline comprises a combustion-supporting air pipe and a combustion gas pipeline; and a computer control system for real-time monitoring. This flue gas heating device and system can realize effective burning through the ratio of rational design combustible gas and air, and the heat transfer that will burn the production gives the flue gas heating fast in waiting to carry out the flue gas that SCR denitration was handled in the flue, realizes catalyst regeneration simultaneously.
Description
Technical Field
The application relates to the field of removing nitrogen oxides in flue gas treatment in high pollution industries such as electric power, metallurgy, coking, cement and the like, in particular to a flue gas heating device and a system; the heating system and the device are particularly suitable for heating flue gas and regenerating a catalyst when a Selective Catalytic Reduction (SCR) technology denitration method is adopted.
Background
The Selective Catalytic Reduction (SCR) technology is the most widely used flue gas nitrogen oxide removal technology at present. The method has the advantages of high denitration efficiency, relatively low price and wide application range, and is applied to domestic and foreign projects to become a mainstream technology for flue gas denitration. In the SCR denitration scheme, the market application of the medium-low temperature SCR denitration technology is more and more extensive. The selection of the medium-low temperature catalyst directly influences the denitration effect. The lowest reaction temperature window of the medium-low temperature catalyst which is mature to be applied in the market at present is 180 ℃. In order to meet the requirement of the optimal reaction temperature of the medium-low temperature catalyst, the flue gas needs to be heated by a heating mode under the condition that the temperature of the flue gas is too low.
Meanwhile, the investment of the catalyst accounts for a large proportion of the investment of the whole system, and after the catalyst is operated for a period of time, the activity and the selectivity of the catalyst are obviously reduced compared with those of a fresh catalyst, namely the catalyst is inactivated. The most common reason is the sulfur dioxide SO in the flue gas after adding the catalyst2Under aerobic conditions, sulfur trioxide SO3The generated amount of the ammonia is greatly increased, and the ammonia and the excessive ammonia gas generate ammonium bisulfate; ammonium bisulfate is corrosive and sticky, and can lead toResulting in the blockage of catalyst pores and reduced catalytic action. At this time, a regeneration process for restoring the catalyst activity is arranged. On the premise of not changing the chemical property of the catalyst, the catalyst is directly activated at high temperature, so that the regeneration of the catalyst can be effectively realized, and the service life of the catalyst is prolonged.
Therefore, it is necessary to provide a heating device which is not sufficient for the above prior art to achieve the goal of heating the flue gas to a suitable denitration temperature while achieving catalyst regeneration.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a flue gas heating device and system can realize effective burning through the ratio of rational design combustible gas and air, in the heat transfer that will burn the production carries out the flue gas that SCR denitration was handled in the flue, gives the flue gas heating fast, realizes catalyst regeneration simultaneously.
In order to achieve the above object, one aspect of the present invention provides the following technical solutions:
a flue gas heating apparatus comprising: the heating furnace is arranged beside the flue and used for providing a heat source for heating the flue gas through combustion; the hot air mixing pipe is arranged in the flue, one end of the hot air mixing pipe extends out of the flue and is connected with the heating furnace, and holes which are uniformly distributed are formed in the part, located in the flue, of the hot air mixing pipe.
As a preferred embodiment, the above flue gas heating apparatus includes: a heating furnace body; the heating furnace body is a fire-resistant heat-insulating closed cavity; the heating furnace body is provided with a combustion burner and a hot air mixing pipe interface, and the combustion burner is used for spraying combustion gas and combustion-supporting air into the heating furnace body for combustion;
the heating furnace body is provided with two combustion burners;
six hot air mixing pipe connectors are arranged at the joints of the heating furnace body and the flue and are divided into an upper row and a lower row, the hot air mixing pipe connectors are arranged on the upper row, the hot air mixing pipe connectors are arranged on the lower row, and the hot air mixing pipe connectors on the upper row and the hot air mixing pipe connectors on the lower row are evenly arranged in a left-right staggered mode.
As a preferred embodiment, the heating furnace body is a square structure formed by enclosing a casing and a refractory lining, and comprises an open box body and a cover matched with the open box body to form a closed space.
In the above flue gas heating apparatus, as a preferred embodiment, the heating furnace body is provided with an observation window.
As a preferred embodiment, the heating furnace body is connected with the flue through a connecting rectangular pipe, and the connecting rectangular pipe is sleeved outside the hot air mixing pipe.
As a preferred embodiment, the above flue gas heating device is provided with one heating furnace on each side of the flue; the two heating furnaces are symmetrically arranged on the left side and the right side of the flue, and the hot air mixing pipe penetrates through flue wall plates on two sides of the flue and is connected with the two heating furnaces.
In the above flue gas heating device, as a preferred embodiment, the hot air mixing pipe is a circular pipe, four rows of holes are arranged on the outer surface of the hot air mixing pipe in a manner parallel to the axial direction, the holes of adjacent rows are aligned in the circumferential direction, and the opening direction of each row of holes is located in the direction of 1:30, 4:30, 7:30 and 10:30 of the clock when viewed from the circumferential direction of the hot air mixing pipe.
A flue gas heating system comprising:
the flue gas heating device comprises two heating furnaces oppositely arranged on two sides of a flue and a hot air mixing pipe which penetrates through two sides of the flue and is connected with the two heating furnaces; a thermocouple is also arranged in the heating furnace and is used for measuring the temperature in the hearth;
a combustion gas source connected to a fuel inlet of a combustion burner of the heating furnace;
the combustion-supporting fan is connected with an air inlet of a combustion burner of the heating furnace;
the matched pipeline comprises a combustion-supporting air pipe and a combustion gas pipeline, wherein the combustion-supporting air pipe and the combustion gas pipeline are respectively provided with an adjusting valve, a flow pore plate and a transmitter and are used for monitoring the flow of fluid in the combustion-supporting air pipe and the combustion gas pipeline; the combustion gas pipeline is provided with a stop valve for cutting off and opening the combustion gas pipeline;
the computer control system comprises a P L C and an HMI (human machine interface), wherein the P L C is respectively connected with a thermocouple in the heating furnace, a smoke detection thermal resistor in the flue, a stop valve, a regulating valve and a transmitter, and is used for receiving and processing transmitted information and then transmitting the information to the HMI, the HMI and the P L C are in data communication, the HMI monitors the operation state of the heating furnace and the field temperature, pressure, flow real-time and historical information in real time, and the HMI, the regulating valve and the combustion fan are remotely operated.
Above-mentioned flue gas heating system, as a preferred embodiment, the trip valve is pneumatic trip valve, the governing valve is pneumatic control valve, flue gas heating system still includes compressed air source and compressed air pipeline, compressed air source passes through the compressed air pipeline respectively with pneumatic trip valve with pneumatic control valve connects for provide the compressed air as power.
In the above flue gas heating system, as a preferred embodiment, the P L C is further connected to a differential pressure detection device disposed on a catalyst layer in the SCR denitration device, and receives a signal detected by the differential pressure detection device, and if the signal is found to be abnormal, controls the flue gas heating device to adjust the heating degree of the flue gas to be subjected to SCR denitration.
Compared with the closest prior art, the utility model provides a technical scheme has following beneficial effect:
1) the lowest reaction temperature window of the medium-low temperature catalyst which is mature and applied in the current market is 165-180 ℃. In flue gas system a bit, can't provide such flue gas temperature, consequently need heat up the flue gas to satisfy the system demand, utilize the heating device that this application provided to heat up the flue gas fast, thereby solve the flue gas temperature effectively and hang down the problem that leads to can't satisfying the best reaction temperature of low temperature catalyst.
2) Under the aerobic condition, the generation amount of sulfur trioxide is greatly increased, and the sulfur dioxide and excessive ammonia gas generate ammonium bisulfate, and the ammonium bisulfate has corrosivity and viscosity and can adsorb fly ash in flue gas, so that the pore of a catalyst is easily blocked, and the catalytic action is reduced. In order to remove the influence of ammonium bisulfate on the catalyst bed, a high-temperature heating method can be adopted to realize the chemical decomposition of the ammonium bisulfate, and the specific principle is as follows: when ammonium bisulfate is heated slightly (200 ℃ or higher), the following decomposition reaction proceeds:
NH4HSO4＝NH3↑+H2SO4
decomposition reaction which occurs when the temperature is continuously raised to above 345 ℃:
H2SO4＝H2O+SO3
in the operation process of the denitration reactor, for example, the designed resistance value of the catalyst layer is less than 1000Pa, and when the resistance value of the catalyst layer is detected to exceed 80-90% of the designed resistance value (namely 800-900Pa), the heating device provided by the application can be used for heating the flue gas in the flue under the condition of not stopping the SCR denitration system, and the hot flue gas can enable ammonium bisulfate to generate the chemical reaction after passing through the catalyst bed layer, so that the regeneration of the catalyst is realized, and the replacement period of the whole catalyst layer is prolonged.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic front view of a heating furnace according to an embodiment of the present invention;
FIG. 2 is a schematic top view of the heating furnace of FIG. 1;
fig. 3 is a schematic front view of a smoke heating device according to an embodiment of the present invention;
FIG. 4 is a schematic top view of the flue gas heating apparatus of FIG. 3;
FIG. 5 is a schematic front view of a hot air mixing tube;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
fig. 7 is a schematic structural flow diagram of a flue gas heating system according to an embodiment of the present invention.
In the figure: 1. heating furnace; 11. a heating furnace body; 12. a combustion burner; 13. a hot air mixing pipe interface; 14. an observation window; 15. a thermocouple; 2. a hot air mixing pipe; 21-holes; 3. connecting the rectangular pipes; 4. a flue; 41. a flue wall plate; 5. a combustion-supporting air duct; 51. a combustion fan; 6. a combustion gas conduit; 61. a source of combustion gas; 7-compressed air pipeline; 71. a source of compressed air; 81. a pressure transmitter; 82. a flow orifice plate; 83. a differential pressure transmitter; 91-pneumatic quick-cut valve; 92-pneumatic regulating valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
According to the utility model discloses a specific embodiment, as shown in fig. 1 to fig. 4, the utility model provides a flue gas heating device, this flue gas heating device includes: a heating furnace 1 and a hot air mixing pipe 2. The above components and their connections will be described below.
Specifically, the heating furnace body is a square structure formed by surrounding an outer shell and a refractory material lining, in the specific embodiment of the utility model, the outer shell of the heating furnace body 11 is a steel plate made of carbon steel, the lining is a complete furnace wall formed by using refractory bricks through a special masonry method, and a stable and firm masonry structure is formed after the heating furnace is dried; including open-ended box and the lid of cooperating with it in order to form airtight space, during operation (during the heating), the box forms airtight space with the lid cooperation, and can open the lid and make things convenient for the staff to get into the operation in the box when needs are installed and are overhauld nozzle and inside refractory material. The combustion burner 12 can be connected with the heating furnace body 11 through a flange, and a plurality of combustion burners 12 can be arranged on one heating furnace to meet different requirements and enhance the applicability of the heating furnace 1, and in the specific embodiment of the utility model, two combustion burners 12 are arranged; similarly, hot-blast mixing pipe interface 13 also can set up a plurality of to satisfy different demands, strengthen the suitability of heating furnace 1, in the embodiment of the utility model discloses a be equipped with six hot-blast mixing pipe interfaces 13, divide into two rows about, three is last, three under, the hot-blast mixing pipe interface 13 of two rows about staggered arrangement is even. The heating furnace 1 provided by the application has the advantages that the combustion burner 12, the heating furnace body 11, related pipelines and valve assemblies can be integrally assembled in a factory and then installed on site, and any secondary processing is not needed on site.
Preferably, a viewing window 14 is designed on the furnace body 11 for viewing the combustion situation in situ.
The hot air mixing pipe 2 is arranged in the flue, the hot air mixing pipe 2 is provided with holes 21, one end of the hot air mixing pipe 2 extends out of the flue and is connected with the heating furnace 1, and the hot air mixing pipe is used for inputting high-temperature flue gas generated by combustion of the heating furnace 1 into the flue to be mixed with the flue gas in the flue, so that heat of the high-temperature flue gas is transferred to the flue gas in the flue, and the hot air mixing pipe is shown in fig. 3, 5 and 6. Specifically, one end of the hot air mixing pipe 2 is connected with the hot air mixing pipe interface 13, the other end of the hot air mixing pipe extends into the flue, and holes 21 which are uniformly distributed are formed in the surface of the extending part, so that high-temperature flue gas generated by sufficient combustion in the heating furnace 1 can properly enter the flue through the holes 21 to be mixed with original flue gas (flue gas to be subjected to SCR denitration) in the flue, heat of the high-temperature flue gas is transferred to original flue gas in the flue, and therefore the original low-temperature flue gas in the flue is heated. Preferably, the holes 21 are uniformly distributed on the surface of the hot air mixing pipe 2; more preferably, the hot air mixing pipe 2 is a circular pipe, three or four rows of holes are arranged on the outer surface of the hot air mixing pipe in a manner of being parallel to the axial direction, and the holes 21 are uniformly distributed along the axial direction and the circumferential direction of the hot air mixing pipe (see fig. 5 and 6); the outer surface of the hot air mixing pipe 2 in the specific embodiment of the application is uniformly provided with four rows of holes in a mode of being parallel to the axial direction, the holes in adjacent rows are aligned in the circumferential direction, and the opening direction of each row of holes is respectively positioned in the directions of 1:30, 4:30, 7:30 and 10:30 of the clock when viewed from the cross section (see fig. 6); so can guarantee more that hot-blast mixing tube 2 keeps sufficient intensity simultaneously the mixed wind is effectual. The hot air mixing pipe of this application is rationally distributed, simultaneously through seting up evenly distributed's hole 21 on the hot air mixing pipe, makes hot-blast and each part abundant contact of flue gas in whole flue cross-section, under the condition of not excessively increasing flue gas resistance, can furthest's the even heating demand of satisfying the flue gas.
Preferably, the heating furnace body 11 and the flue are connected together through a connecting rectangular pipe 3; specifically, the heating furnace body 11 and the flue wall plate 41 are connected together through a connecting rectangular pipe 3, and the connecting rectangular pipe 3 is sleeved outside the hot air mixing pipe 2; the connecting rectangular pipe 3 not only has the function of facilitating the connection of the heating furnace body 11 and the flue, but also has the functions of sealing and heat preservation.
Preferably, one heating furnace 1 is arranged on each side of the flue. Specifically, the two heating furnaces 1 are respectively arranged on the left side and the right side of the flue wall plate 41 and connected through the hot air mixing pipe 1; the hot air mixing pipe 1 penetrates through the wall plates of the flues at the two sides, and the part of the hot air mixing pipe 2 in the flue is provided with uniform distribution holes. The number of the hot air mixing pipes 1 can be set according to the situation, and the utility model discloses do not do the restriction to this.
In the application, the combustion burner 12 preferably adopts a low-NOx temperature-adjusting gas burner, for example, the model of the product of Beijing Xingda Chi thermotechnical control equipment Limited company is BSTN1500 coke oven gas burner, and the burner is designed by adopting a staged mixed combustion principle, and has the advantages of large adjusting ratio, good flame stability, low NOx emission and the like; the combustion medium can be coke oven gas or blast furnace gas. The burner has the following functions, and the working state of the burner can be displayed in real time through a computer: 1) automatic ignition: the gas burner enables high-reliability ignition to be possible by configuring a reliable built-in ignition device and a special high-voltage ignition transformer; 2) flame detection and flameout protection: the gas burner is provided with an ultraviolet flame detection device or an ionization flame detection device, and is matched with a burner controller for use, so that flameout protection of the burner is realized; 3) multistage combustion technology: the application of the air flow guider enables the gas and the combustion air to realize multi-stage mixing, a local gas-rich area and oxygen-poor combustion are formed, and the emission of NOx products is greatly reduced; 4) controlling the spraying temperature of the flue gas: under the condition of given primary air supply, the secondary air supply amount is adjusted, so that the spraying temperature of the high-temperature flue gas can be adjusted to be reduced to a temperature close to the preset flue gas temperature, and overheating and overburning are prevented and avoided.
As shown in fig. 7, the utility model also provides a flue formula heating system, include: the flue gas heating device comprises a combustion fan, a combustion gas source, a matched pipeline, a valve and an instrument, and a computer control system for monitoring the running state of the system in real time.
Specifically, above-mentioned flue gas heating system includes:
the flue gas heating device comprises two heating furnaces 1 which are oppositely arranged on two sides of a flue, and a hot air mixing pipe 2 which penetrates through two sides of the flue and is connected with the two heating furnaces 1; a thermocouple is also arranged in the heating furnace 1 and is used for measuring the temperature in the hearth;
a combustion gas source 61 connected to a fuel inlet of the combustion burner 12 of the heating furnace 1;
a combustion fan 51 connected to an air inlet of the combustion burner 12 of the heating furnace 1;
the matched pipelines comprise a combustion-supporting air pipe 5 and a combustion gas pipeline 6, wherein the combustion-supporting air pipe 5 and the combustion gas pipeline 6 are respectively provided with an adjusting valve, flow pore plates 82 and 83 and a transmitter for monitoring the flow of fluid in the combustion-supporting air pipe 5 and the combustion gas pipeline 6; a cut-off valve is arranged on the combustion gas pipeline 6 and is used for cutting off and opening the combustion gas pipeline 6;
a computer control system comprises a P L C (Programmable logic Controller) and an HMI (Human Machine Interface) which are connected with each other, wherein the P L C is respectively connected with a thermocouple 15 in a heating furnace 1, a smoke detection thermal resistor (not shown in figure 7) in a flue, valves (such as a pneumatic quick-cut valve 91, a pneumatic adjusting valve 92) on a pipeline, a transmitter (such as a pressure transmitter 81 and a differential pressure transmitter 83) and the like, is used for receiving and processing transmitted information and then transmitting the information to the HMI, the HMI and the P L C are used for data communication, the HMI is used for monitoring the running state of each device (such as a combustion burner, a valve, a detection device of each measuring point, a combustion fan and the like) and real-time and historical information of field temperature, pressure, flow and the like in real time, and simultaneously carrying out remote operation of the field device (such as the combustion burner, the valve, the combustion fan and the like).
As a preferred embodiment, the cut-off valve is a pneumatic quick-cutting valve 91, the regulating valve is a pneumatic regulating valve 92, two pneumatic quick-cutting valves 91 are adjacently arranged on a main pipe of the combustion gas pipeline 6, each branch pipe of the combustion gas pipeline 6 is provided with one pneumatic quick-cutting valve 91, and the main pipes of the combustion gas pipeline 6 and the combustion air pipe 5 are provided with one pneumatic regulating valve 92; the flue gas heating system also comprises a compressed air source 71 and a compressed air pipeline 7, wherein the compressed air source 71 is respectively connected with the pneumatic regulating valve 92 and the pneumatic quick-cutting valve 91 through the compressed air pipeline 7 and is used for providing compressed air as power.
In the utility model discloses a preferred embodiment, computer control system adopts one set of German SIEMENS S7-300 series P L C control system, need be furnished with a switch board for establishing above-mentioned computer control system, P L C installs inside the switch board, be equipped with an HMI on the switch board, carry out data communication between HMI and the P L C, the operator can real-time supervision heating system 'S each equipment' S running state and various real-time and historical information such as site temperature, pressure, flow through HMI, the remote operation of field device can be carried out through HMI simultaneously.
In the preferred embodiment of the present invention, two heating furnaces 1 are symmetrically arranged on both sides of a flue 4 in the whole heating system, a set of hot air mixing pipes 2 (6 in total) penetrates through both sides of the flue 4 and connects the two heating furnaces 1, each heating furnace 1 is provided with two combustion burners 12, the combustion gas pipeline 6 comprises a main pipe and four branch pipes respectively connected with the four combustion burners, the main pipe is sequentially provided with a manual ball valve, a blind valve, two pneumatic quick-cutting valves 91 adjacently arranged, a pressure transmitter 81, a flow orifice plate 82, a differential pressure transmitter 83 and a pneumatic regulating valve 92 according to a fluid flow direction, the four branch pipes are respectively provided with one pneumatic quick-cutting valve 91 and manual ball valves arranged in front and at back of each pneumatic quick-cutting valve 91, a combustion air pipe 5 also comprises a main pipe and four branch pipes respectively connected with the four combustion burners 12, the main pipe is provided with one pneumatic regulating valve 92, the branch pipes are provided with manual regulating valves, for consideration in terms of safety and automatic control, the pneumatic cutting-off the combustion gas pipeline 6 is opened and cutting off the combustion gas pipeline 6, the combustion gas temperature is adjusted by adopting a pneumatic regulating valve 92, the thermocouple for adjusting the combustion gas temperature of the combustion gas temperature, the combustion gas temperature of the furnace is adjusted, the heating furnace is adjusted by the thermocouple, the thermocouple for directly adjusting furnace is used for adjusting and the heating furnace, the heating furnace is used for adjusting temperature detecting value is used for detecting value, the heating furnace is used for detecting value, the heating furnace temperature detecting value is used for detecting temperature detecting, the heating furnace, the.
The above flue gas heating system, as a preferred embodiment, is characterized in that P L C is further connected to a differential pressure detection device disposed on a catalyst layer in an SCR denitration device, and receives a signal detected by the differential pressure detection device, and if the signal is found to be abnormal, that is, if a value corresponding to the signal exceeds a preset threshold, the flue gas heating device is controlled to adjust a heating degree of flue gas to be subjected to SCR denitration.
In short, the main process flow for treating the flue gas to be subjected to SCR denitration by using the flue gas heating system is as follows: after the combustible gas supplied by a factory and the air introduced by the combustion fan are reasonably proportioned, the combustible gas is fully combusted in the heating furnace 1 through the combustion burner 12; the heat generated by combustion heats the flue gas through the holes uniformly distributed on the hot air mixing pipe 2, thereby realizing the purpose of heating the flue gas. The combustion of the heating furnace 1 is monitored in real time through a whole set of computer control system, so that the stability of the combustion system is ensured, and the requirement of the temperature change of the flue gas on the heating capacity of the heating device can be met.
To sum up, the flue gas heating device and the flue gas heating system provided by the utility model can rapidly heat the flue gas when the flue gas temperature of the denitration system is lower than the optimal reaction temperature requirement of the catalyst, so as to meet the system requirement; meanwhile, the catalyst is regenerated under the condition that the normal operation of the denitration system is not influenced, namely, the online regeneration is carried out.
More specifically, the utility model provides a flue gas heating device and system has following advantage:
1. the heating furnace adopts an integrated design, and is convenient and rapid to install;
2. the low-nitrogen combustion technology is adopted, and meanwhile, the accurate control of a combustion system is realized by combining a computer system;
3. the design of the hot air mixing pipeline realizes uniform heating;
4. the online regeneration of the catalyst can be realized; the following target requirements for the regenerated catalyst can be met: (1) the physical blockage of the regenerated catalyst is less than 5 percent; (2) physical and chemical properties are restored to the level close to that of a new catalyst; (3) mechanical strength to withstand transport and expected service life of the catalyst; (4) denitration rate, SO2/SO3The conversion rate, the ammonia escape rate and the pressure drop are ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A flue gas heating apparatus, characterized in that the flue gas heating apparatus comprises: the heating furnace is arranged beside the flue and used for providing a heat source for heating the flue gas through combustion; the hot air mixing pipe is arranged in the flue, one end of the hot air mixing pipe extends out of the flue and is connected with the heating furnace, and holes which are uniformly distributed are formed in the part, located in the flue, of the hot air mixing pipe.
2. The flue gas heating apparatus according to claim 1, wherein the heating furnace comprises: a heating furnace body; the heating furnace body is a fire-resistant heat-insulating closed cavity; the heating furnace body is provided with a combustion burner and a hot air mixing pipe interface, and the combustion burner is used for spraying combustion gas and combustion-supporting air into the heating furnace body for combustion;
the heating furnace body is provided with two combustion burners;
six hot air mixing pipe connectors are arranged at the joints of the heating furnace body and the flue and are divided into an upper row and a lower row, the hot air mixing pipe connectors are arranged on the upper row, the hot air mixing pipe connectors are arranged on the lower row, and the hot air mixing pipe connectors on the upper row and the hot air mixing pipe connectors on the lower row are evenly arranged in a left-right staggered mode.
3. The fume heating device according to claim 2, wherein said furnace body is a square structure formed by surrounding an outer shell and a refractory lining, and comprises an open box body and a cover cooperating therewith to form a closed space.
4. The fume heating device according to claim 2, wherein an observation window is provided on said heating furnace body.
5. The flue gas heating device according to claim 2, wherein the heating furnace body is connected with the flue through a connecting rectangular pipe, and the connecting rectangular pipe is sleeved outside the hot air mixing pipe.
6. A flue gas heating apparatus according to any one of claims 1 to 3, wherein one heating furnace is arranged on each side of the flue; the two heating furnaces are symmetrically arranged on the left side and the right side of the flue, and the hot air mixing pipe penetrates through flue wall plates on two sides of the flue and is connected with the two heating furnaces.
7. The flue gas heating device according to any one of claims 1 to 3, wherein the hot air mixing pipe is a circular pipe, four rows of holes are arranged on the outer surface of the hot air mixing pipe in a manner parallel to the axial direction, the holes of adjacent rows are aligned in the circumferential direction, and the opening direction of each row of holes is respectively located in the directions of 1:30, 4:30, 7:30 and 10:30 of the clock when viewed from the circumferential direction of the hot air mixing pipe.
8. A flue gas heating system, comprising:
the flue gas heating device according to any one of claims 1 to 7, comprising two heating furnaces oppositely arranged at two sides of the flue, and a hot air mixing pipe penetrating through two sides of the flue and connecting the two heating furnaces; a thermocouple is also arranged in the heating furnace and is used for measuring the temperature in the hearth;
a combustion gas source connected to a fuel inlet of a combustion burner of the heating furnace;
the combustion-supporting fan is connected with an air inlet of a combustion burner of the heating furnace;
the matched pipeline comprises a combustion-supporting air pipe and a combustion gas pipeline, wherein the combustion-supporting air pipe and the combustion gas pipeline are respectively provided with an adjusting valve, a flow pore plate and a transmitter and are used for monitoring the flow of fluid in the combustion-supporting air pipe and the combustion gas pipeline; the combustion gas pipeline is provided with a stop valve for cutting off and opening the combustion gas pipeline;
the computer control system comprises a P L C and an HMI (human machine interface), wherein the P L C is respectively connected with a thermocouple in the heating furnace, a smoke detection thermal resistor in the flue, a stop valve, a regulating valve and a transmitter, and is used for receiving and processing transmitted information and then transmitting the information to the HMI, the HMI and the P L C are in data communication, the HMI monitors the operation state of the heating furnace and the field temperature, pressure, flow real-time and historical information in real time, and the HMI, the regulating valve and the combustion fan are remotely operated.
9. The fume heating system of claim 8,
the trip valve is pneumatic trip valve, the governing valve is pneumatic governing valve, flue gas heating system still includes compressed air source and compressed air pipeline, compressed air source passes through the compressed air pipeline respectively with pneumatic trip valve with pneumatic governing valve connects for provide the compressed air as power.
10. The fume heating system according to claim 8 or 9,
and the P L C is also connected with a differential pressure detection device arranged on a catalyst layer in the SCR denitration device, receives a signal detected by the differential pressure detection device, and controls the flue gas heating device to adjust the heating degree of the flue gas to be subjected to SCR denitration if the signal is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922026429.9U CN211146538U (en) | 2019-11-21 | 2019-11-21 | Flue gas heating device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922026429.9U CN211146538U (en) | 2019-11-21 | 2019-11-21 | Flue gas heating device and system |
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| CN211146538U true CN211146538U (en) | 2020-07-31 |
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| CN201922026429.9U Active CN211146538U (en) | 2019-11-21 | 2019-11-21 | Flue gas heating device and system |
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| Country | Link |
|---|---|
| CN (1) | CN211146538U (en) |
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2019
- 2019-11-21 CN CN201922026429.9U patent/CN211146538U/en active Active
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