Flue gas pollutant purification device

Abstract

The invention relates to a flue gas pollutant purification device. The flue gas pollutant purification device comprises a dust remover, a reactor and a flue gas heat exchanger, the dust remover is erected above the support, surrounding plates are arranged on the periphery of the support, the surrounding plates define a containing space below the dust remover, and the reactor is arranged in the containing space. The dust remover and the reactor are vertically arranged, so that the occupied area is reduced. The coaming plays a role in heat insulation, reduces heat loss of the reactor, and realizes energy conservation and consumption reduction. The flue gas heat exchanger comprises an original flue gas side and a purified flue gas side, the original flue gas side is provided with a first inlet located on the upper portion and a first outlet located on the lower portion, and the purified flue gas side is provided with a second inlet located on the upper portion and a second outlet located on the lower portion. Wherein flue gas enters from an inlet of the dust remover, an outlet of the dust remover is communicated with the first inlet, the first outlet is communicated with an inlet of the reactor, an outlet of the reactor is communicated with the second inlet, and the flue gas is discharged from the second outlet. The reverse-flow heat exchanger enables the reactor not to be arranged above the heat exchanger, so that the construction cost of the reactor is reduced.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to a flue gas pollutant purification device. Background Art

[0002] Traditional flue gas pollutant treatment devices are generally equipped with independent subsystems such as desulfurization towers, bag filters, CO reactors (carbon monoxide reactors), SCR reactors (selective catalytic reduction reactors), flue gas heat exchangers, etc. The subsystems are arranged in sequence and occupy a large area. However, in actual projects, the factory site is often extremely limited and compact. There is no space for each system to be arranged in sequence, and it is impossible to arrange a complete full-process device. Therefore, this layout method is difficult to apply in a compact site.

[0003] In addition, the CO reactor and SCR reactor need to be installed above the flue gas heat exchanger, which requires a large investment. At the same time, due to the limited floor space, the CO reactor and SCR reactor are too small, resulting in a small catalyst circulation area, which is not conducive to the full contact between the denitration catalyst and the flue gas, and there are problems such as poor denitration effect. In addition, the CO reactor and SCR reactor are placed outside in an external environment with air circulation, which makes the CO reactor and SCR reactor have more heat dissipation surfaces, a larger temperature drop, and higher energy consumption. Summary of the invention

[0004] The object of the present invention is to provide a flue gas pollutant purification device to solve the problems that the device occupies a large area, the reactor is small in size but dissipates a lot of heat, resulting in poor reaction effect, and the reactor needs to be installed at a high altitude, which requires a large investment.

[0005] The problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0007] The present invention provides a flue gas pollutant purification device, which includes a dust collector, a reactor and a flue gas heat exchanger;

[0008] The dust collector is mounted above the bracket, and a surrounding plate is arranged around the bracket. The surrounding plate encloses a containing space below the dust collector, and the reactor is arranged in the containing space;

[0009] The flue gas heat exchanger comprises a raw flue gas side and a clean flue gas side, the raw flue gas side having a first inlet located at the top and a first outlet located at the bottom, and the clean flue gas side having a second inlet located at the top and a second outlet located at the bottom;

[0010] Among them, flue gas enters from the inlet of the dust collector, the outlet of the dust collector is communicated with the first inlet, the first outlet is communicated with the inlet of the reactor, the outlet of the reactor is communicated with the second inlet, and the flue gas is discharged from the second outlet.

[0011] In some embodiments of the present application, the reactor includes a CO reactor and an SCR reactor arranged side by side.

[0012] In some embodiments of the present application, the flue gas pollutant purification device further includes a heating furnace and an ammonia injection grid;

[0013] The first outlet is communicated with the inlet of the CO reactor, the outlet of the CO reactor is communicated with the inlet of the heating furnace, the outlet of the heating furnace is communicated with the inlet of the ammonia injection grid, the outlet of the ammonia injection grid is communicated with the inlet of the SCR reactor, and the outlet of the SCR reactor is communicated with the second inlet.

[0014] In some embodiments of the present application, the housing of the reactor is provided with a heat insulation layer.

[0015] In some embodiments of the present application, the flue gas pollutant purification device further includes a support;

[0016] The support is arranged in the accommodation space and the support is connected to the bracket;

[0017] The reactor is supported on the support.

[0018] In some embodiments of the present application, the flue gas pollutant purification device further includes a desulfurization tower;

[0019] The outlet of the desulfurization tower is communicated with the inlet of the dust collector, and the flue gas enters from the inlet of the desulfurization tower.

[0020] In some embodiments of the present application, the flue gas pollutant purification device further includes a chimney and an induced draft fan;

[0021] The second outlet is communicated with the inlet of the chimney, and the flue gas is discharged from the outlet of the chimney;

[0022] The induced draft fan is arranged on the connecting flue between the second outlet and the chimney.

[0023] In some embodiments of the present application, a heating device is arranged in the accommodation space.

[0024] In some embodiments of the present application, the dust collector is a bag filter.

[0025] In some embodiments of the present application, the flue gas heat exchanger is arranged outside the accommodation space and is located on the side of the reactor.

[0026] As can be seen from the above technical solutions, the embodiments of the present invention have at least the following advantages and positive effects:

[0027] In the flue gas pollutant purification device of the embodiment of the present invention, the dust collector and the reactor are vertically arranged in the up and down direction, reducing the floor area and facilitating the arrangement of the flue gas pollutant purification device in a limited space.

[0028] Moreover, a reactor with a larger area can be arranged below the dust collector, increasing the catalyst flow area in the reactor, making the flue gas smoother and the flow field more uniform, which is conducive to the full contact between the catalyst and the flue gas, thereby improving the removal efficiency of flue gas pollutants and enhancing the system performance.

[0029] The reactor is embedded in the accommodation space enclosed by the enclosure plate, and the enclosure plate plays a role in heat insulation, forming a heat preservation space in the accommodation space, reducing the temperature difference between the reactor and the surrounding environment, reducing the heat exchange between the reactor and the surrounding environment, reducing the heat loss of the reactor, and achieving energy conservation and consumption reduction.

[0030] Since the reactor is located below the dust collector, the traditional co-current heat exchanger is correspondingly changed to a counter-current heat exchanger to adapt to the layout location of the reactor and the dust collector, rationalize the layout of the flue duct. At the same time, the reactor does not need to be set high above the heat exchanger, reducing the installation height of the reactor, thereby reducing the material consumption of the support frame for supporting the reactor and the construction difficulty of building the support frame, and greatly reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings, various objectives, features and advantages of the present invention will become more apparent. The drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components.

[0032] Wherein:

[0033] Figure 1 is a connection schematic diagram of an existing flue gas pollutant purification device.

[0034] Figure 2 is a connection schematic diagram of a flue gas pollutant purification device shown according to an exemplary embodiment.

[0035] Figure 3 is a front view structural diagram of a flue gas pollutant purification device shown according to an exemplary embodiment.

[0036] Figure 4 is a side view structural diagram of a flue gas pollutant purification device shown according to an exemplary embodiment.

[0037] The description of the attached drawing reference numerals is as follows: 11, desulfurization tower; 12, bag filter; 13, CO reactor; 14, SCR reactor; 15, flue gas heat exchanger; 16, heating furnace; 21, dust collector; 22, reactor; 221, CO reactor; 222, SCR reactor; 23, flue gas heat exchanger; 24, support; 25, enclosing plate; 26, desulfurization tower; 27, heating furnace; 28, ammonia injection grid; 29, support; 30, chimney; 31, induced draft fan. Detailed implementation manners

[0038] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific implementation manners of the present application with reference to the attached drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if there appear these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the attached drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0040] In addition, if there appear these terms "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there appears the term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] See also Figure 1 , Figure 1 It is a connection diagram of the existing flue gas pollutant purification device. The traditional flue gas pollutant treatment device is generally equipped with independent subsystems such as desulfurization tower 11, bag filter 12, CO reactor 13 (carbon monoxide reactor), SCR reactor 14 (selective catalytic reduction reactor), flue gas heat exchanger 15, etc. Each subsystem is arranged in sequence and occupies a large area. In actual projects, it is often encountered that the space for accommodation is extremely limited and compact. There is no space for each system to be arranged in sequence, and it is impossible to arrange a complete full-process device. Therefore, this layout method is difficult to apply in a compact site.

[0044] Moreover, the CO reactor 13 and the SCR reactor 14 need to be installed above the flue gas heat exchanger 15, which requires a large investment. At the same time, due to the limited floor space, the CO reactor 13 and the SCR reactor 14 are too small, resulting in a small catalyst flow area, which is not conducive to the full contact between the denitration catalyst and the flue gas, and there are problems such as poor denitration effect. In addition, the CO reactor 13 and the SCR reactor 14 are placed outside in an external environment with air circulation, so that the CO reactor 13 and the SCR reactor 14 have more heat dissipation surfaces, a larger temperature drop, and higher energy consumption.

[0045] In order to solve the problems that the device occupies a large area, the reactor is small in size but dissipates a lot of heat, resulting in poor reaction effect, and the reactor needs to be installed at a high altitude, which requires a large investment, the present invention provides a flue gas pollutant purification device.

[0046] Please refer to Figures 2 to 4 , Figure 2 which is a schematic connection diagram of a flue gas pollutant purification device shown according to an exemplary embodiment. Figure 3 which is a front view structural diagram of a flue gas pollutant purification device shown according to an exemplary embodiment. Figure 4 which is a side view structural diagram of a flue gas pollutant purification device shown according to an exemplary embodiment.

[0047] The flue gas pollutant purification device provided by an embodiment of the present invention mainly includes a dust collector 21, a reactor 22, and a flue gas heat exchanger 23.

[0048] The dust collector 21 is used to capture, separate, and purify dust particles in the flue gas. In this embodiment, the reactor 22 is a bag filter 21. Of course, according to the specific application scenario of the flue gas pollutant purification device, for example, a cyclone dust collector 21, an electrostatic dust collector 21, a granular layer dust collector 21, etc. can also be used, which is not limited herein.

[0049] The dust collector 21 is erected above the bracket 24, and a surrounding plate 25 is provided around the bracket 24. The surrounding plate 25 encloses an accommodation space below the dust collector 21.

[0050] The reactor 22 is provided with a catalyst. The catalyst can react with flue gas pollutants to remove the flue gas pollutants, and the type of the catalyst can be adjusted according to the type of the flue gas pollutants to be removed. For example, a CO catalyst can remove CO in the flue gas, and an SCR catalyst can remove nitrogen oxides in the flue gas. The reactor 22 is arranged in the accommodation space.

[0051] The flue gas heat exchanger 23 is used to realize heat exchange between the flue gas and other media, utilize the heat energy of the flue gas to heat or cool other media, and realize heat transfer and recovery. The flue gas heat exchanger 23 includes an original flue gas side and a clean flue gas side. The original flue gas side has a first inlet located above and a first outlet located below, and the clean flue gas side has a second inlet located above and a second outlet located below.

[0052] Among them, the flue gas enters from the inlet of the dust collector 21. The outlet of the dust collector 21 is connected to the first inlet, the first outlet is connected to the inlet of the reactor 22, the outlet of the reactor 22 is connected to the second inlet, and the flue gas is discharged from the second outlet.

[0053] Through the above structural design, the dust collector 21 and the reactor 22 are vertically arranged in the up and down direction, reducing the floor area and being beneficial to arranging the flue gas pollutant purification device in a limited space.

[0054] And a reactor 22 with a larger area can be arranged below the dust collector 21 to increase the catalyst flow area in the reactor 22, making the flue gas flow more smoothly and the flow field more uniform, which is conducive to the full contact between the catalyst and the flue gas, thereby improving the removal efficiency of flue gas pollutants and enhancing the system performance.

[0055] The reactor 22 is embedded in the accommodation space enclosed by the enclosure plate 25. The enclosure plate 25 plays a role in heat insulation, forming a heat preservation space in the accommodation space, reducing the temperature difference between the reactor 22 and the surrounding environment, reducing the heat exchange between the reactor 22 and the surrounding environment, and reducing the heat loss of the reactor 22, thus achieving energy conservation and consumption reduction.

[0056] Since the reactor 22 is located below the dust collector 21, the traditional co-current heat exchanger is correspondingly changed to a counter-current heat exchanger to adapt to the layout locations of the reactor 22 and the dust collector 21, rationalize the layout of the flue duct. At the same time, the reactor 22 does not need to be set at a high position above the heat exchanger, reducing the installation height of the reactor 22, thereby reducing the material consumption of the support frame for supporting the reactor 22 and the construction difficulty of building the support frame, and greatly reducing the manufacturing cost.

[0057] It should be explained that for the co-current heat exchanger, the first inlet on the primary flue gas side is located below, the first outlet is located above, the second inlet on the clean flue gas side is located below, and the second outlet is located above. The reactor 22 is set at a high position above the heat exchanger, and the outlet of the dust collector 21 is connected to the first inlet located below, and the first outlet located above is connected to the inlet of the reactor 22.

[0058] The present application innovatively changes the flue gas flow direction of the flue gas heat exchanger 23. Furthermore, the reactor 22 does not need to be set at a high position above the heat exchanger, reducing the material cost and construction cost of setting the reactor 22 at a high position. In this embodiment, the flue gas heat exchanger 23 is arranged outside the accommodation space and on the side of the reactor 22.

[0059] The flue gas pollutant purification device further includes a desulfurization tower 26. The outlet of the desulfurization tower 26 is connected to the inlet of the dust collector 21, and the flue gas enters from the inlet of the desulfurization tower 26. Sulfides in the flue gas can be removed when the flue gas passes through the desulfurization tower 26.

[0060] The reactor 22 includes a CO reactor 221 and an SCR reactor 222 arranged side by side. A CO catalyst is provided in the CO reactor 221. When the flue gas flows through the CO reactor 221, CO in the flue gas can react with the CO catalyst to remove CO in the flue gas. A denitration catalyst is provided in the SCR reactor 222. When the flue gas flows through the SCR reactor 222, nitrogen oxides in the flue gas can react with the denitration catalyst to remove nitrogen oxides in the flue gas. Therefore, the flue gas pollutant purification device can synergistically remove sulfides, CO, and nitrogen oxides in the flue gas and can perform dust removal in the dust collector 21.

[0061] In this embodiment, multiple catalyst layers are provided in the CO reactor 221 at intervals in the vertical direction, and a CO catalyst is placed on each catalyst layer. Multiple catalyst layers are provided in the SCR reactor 222 at intervals in the vertical direction, and a denitration catalyst is placed on each catalyst layer. Maintenance windows are opened on the shells of the CO reactor 221 and the SCR reactor 222 at positions corresponding to each catalyst layer. A passage leading to each maintenance window is provided in the accommodation space, which can be realized by erecting steel beams and platforms, facilitating passage for maintenance and improving the convenience of operation and maintenance.

[0062] In the vertical direction, i.e., the height direction, the heights of the catalyst layers of the CO reactor 221 correspond one by one to the heights of the catalyst layers of the SCR reactor 222. Multiple maintenance platforms are provided in the accommodation space at intervals in the vertical direction, and each maintenance platform has a passage leading to the catalyst layer of the CO reactor 221 and the catalyst layer of the SCR reactor 222 at the corresponding level. The flue gas pollutant purification device further includes a lifting device, such as but not limited to a manual hoist or an electric hoist. The lifting device can transport the operator to any maintenance platform to facilitate the maintenance of the CO reactor 221 and the SCR reactor 222. The maintenance platform also has a passage connecting the dust collector operation platform and the desulfurization tower operation platform to facilitate the unified operation and maintenance of the dust collector 21 and the desulfurization tower 26.

[0063] The flue gas pollutant purification device further includes a heating furnace 27 and an ammonia injection grid 28. The first outlet is connected to the inlet of the CO reactor 221, the outlet of the CO reactor 221 is connected to the inlet of the heating furnace 27, the outlet of the heating furnace 27 is connected to the inlet of the ammonia injection grid 28, the outlet of the ammonia injection grid 28 is connected to the inlet of the SCR reactor 222, and the outlet of the SCR reactor 222 is connected to the second inlet.

[0064] The flue gas after removing CO through the CO reactor 221 is heated and raised in temperature by the heating furnace 27. The ammonia injection grid 28 evenly injects ammonia into the flue gas and then enters the SCR reactor 222 for denitration reaction.

[0065] It is worth mentioning that when the combustion medium of the heating furnace 27 is coal, sulfides exist in the combustion products, which will reduce the activity of the CO catalyst and affect the removal effect of the CO reactor. Connecting the heating furnace 27 between the CO reactor 221 and the SCR reactor 222, compared with Figure 1 the scheme shown in which the heating furnace 16 is connected before the CO reactor 13, can avoid the harm of sulfides to the activity of the CO catalyst and effectively guarantee the removal effect of the CO reactor.

[0066] In addition, the suitable reaction temperature of the CO reactor 221 is lower than that of the SCR reactor 222. In the upward flow of the flue gas, the CO reactor 221 is located before the heating furnace 27, and the SCR reactor 222 is located after the heating furnace 27. Therefore, after being heated by the heating furnace 27, the temperature of the flue gas in the SCR reactor 222 is higher than the reaction temperature of the CO reactor 221, which better meets the requirements of the CO reactor 221 and the SCR reactor 222 for the reaction temperature. The clean flue gas flowing out of the SCR reactor 222 can exchange heat with the raw flue gas flowing into the CO reactor 221 through the flue gas heat exchanger 23. At the same time, both the CO reactor 221 and the SCR reactor 222 are in the heat preservation space formed by the enclosure plate 25, which can ensure that the flue gas temperature entering the CO reactor 221 reaches the reaction temperature requirement during the startup stage.

[0067] However, the heat exchange efficiency cannot reach 100%. It is precisely because of the heat loss that the flue gas temperature of the CO reactor 221 is lower than that of the SCR reactor 222, which is conducive to keeping both the CO reactor 221 and the SCR reactor 222 within their respective suitable reaction temperature ranges, ensuring the efficient and stable operation of the flue gas pollutant purification device.

[0068] It should be noted that the heating furnace 27 does not need to be continuously turned on during the reaction process. Specifically, during startup, the heating furnace 27 is first used to heat up, so that the CO reactor 221 reaches the reaction temperature of about 280 - 310 °C. The CO removal reaction in the CO reactor 221 releases heat at this temperature, raising the flue gas temperature by about 30 °C. The temperature of the flue gas entering the SCR reactor 222 is about 310 - 320 °C. After the flue gas is treated by the SCR reactor 222 at this temperature and exits from the outlet, when the clean flue gas passes through the flue gas heat exchanger 23, it exchanges heat with the raw flue gas again, so that the temperature of the raw flue gas entering the CO reactor 221 is about 270 - 280 °C. Due to the self-heating of the CO reaction, the CO reactor 221 and the SCR reactor respectively reach the reaction temperature equilibrium state. If the temperature rise is insufficient, the heating furnace 27 will participate in heating up again. If the temperature of the CO reactor reaches equilibrium, the heating furnace 27 will stop heating, saving energy consumption.

[0069] The shell of the reactor 22 is provided with a heat insulation layer. The heat insulation layer includes but is not limited to using rock wool to make a sandwich layer. The heat insulation layer can reduce the heat loss in the reactor 22.

[0070] The flue gas pollutant purification device also includes a support 29. The support 29 is arranged in the accommodation space. The support 29 is connected to the bracket 24, and the reactor 22 is supported on the support 29. The support 29 is used to install the bracket 24. The bracket 24 can be formed by overlapping steel columns and crossbeams of a steel structure, or the bracket 24 can also be formed by overlapping steel members. The heat insulation layer on the shell of the reactor 22 can also prevent the heat of the reactor 22 from being transferred to the bracket 24, avoiding the deformation of the steel frame affected by high temperature.

[0071] The shroud 25 is connected to the columns and / or crossbeams. The shroud 25 forms an enclosed accommodation space below the dust collector 21 for heat insulation from the outside. A heating device is provided in the accommodation space. During the operation of the heating device, the ambient temperature of the accommodation space can be increased, thereby further reducing the heat dissipation and temperature drop of the reactor 22, achieving a better energy-saving and environmental protection effect. The heating device includes, but is not limited to, hot water boilers, steam boilers, air source heat pumps, ground source heat pumps, electric heaters, gas heaters, etc. It ensures that the heat exchange between the CO reactor 221 and the SCR reactor 222 and the environment is greatly reduced, saving a large amount of gas burned by the heating furnace 27.

[0072] The flue gas pollutant purification device further includes a chimney 30 and a draft fan 31. The second outlet communicates with the inlet of the chimney 30, and the flue gas is discharged from the outlet of the chimney 30. The draft fan 31 is provided on the connecting flue between the second outlet and the chimney 30. The draft fan 31 provides the power for the operation of the flue gas pollutant purification device.

[0073] The following specifically describes the operation process of the flue gas pollutant purification device in combination with the above embodiments: The flue gas is purified in the desulfurization tower 26 to remove SO2 in the flue gas, enters the dust collector 21, and the dust in the flue gas is purified in the dust collector 21. It is connected to the first inlet of the raw flue gas side of the flue gas heat exchanger 23 through the outlet flue of the dust collector 21 for primary heat exchange. After the heat exchange, it is taken out through the first outlet of the raw flue gas side and sent to the inlet flue of the CO reactor 221 to enter the CO reactor 221 for CO removal reaction. After being heated by the heating furnace 27 and uniformly injecting ammonia through the ammonia injection grid 28, it enters the SCR reactor 222 for denitrification reaction. The purified flue gas is led out through the outlet flue of the SCR reactor 222 to the second inlet of the clean flue gas side of the flue gas heat exchanger 23 for heat exchange and then discharged from the second outlet and sent to the chimney 30 through the draft fan 31. Thus, the integrated purification of dust removal, desulfurization, denitrification, and decarbonization is realized.

[0074] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are descriptive and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly interpreted within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A flue gas pollutant purification device, characterized in that, It includes a dust collector, a reactor and a flue gas heat exchanger; The dust collector is erected above the support, a surrounding plate is provided around the support, the surrounding plate encloses an accommodation space below the dust collector, and the reactor is arranged in the accommodation space; The flue gas heat exchanger includes a raw flue gas side and a clean flue gas side. The raw flue gas side has a first inlet located above and a first outlet located below, and the clean flue gas side has a second inlet located above and a second outlet located below; Among them, flue gas enters from the inlet of the dust collector, the outlet of the dust collector is communicated with the first inlet, the first outlet is communicated with the inlet of the reactor, the outlet of the reactor is communicated with the second inlet, and the flue gas is discharged from the second outlet.

2. The flue gas pollutant purification device according to claim 1, characterized in that The reactor includes a CO reactor and an SCR reactor arranged side by side.

3. The flue gas pollutant purification device according to claim 2, wherein The flue gas pollutant purification device further includes a heating furnace and an ammonia injection grid; The first outlet is communicated with the inlet of the CO reactor, the outlet of the CO reactor is communicated with the inlet of the heating furnace, the outlet of the heating furnace is communicated with the inlet of the ammonia injection grid, the outlet of the ammonia injection grid is communicated with the inlet of the SCR reactor, and the outlet of the SCR reactor is communicated with the second inlet.

4. The flue gas pollutant purification device according to claim 1, characterized in that, The shell of the reactor is provided with a heat insulation layer.

5. The flue gas pollutant purification device according to claim 1, wherein The flue gas pollutant purification device further includes a support; The support is arranged in the accommodation space and is connected to the support; The reactor is supported on the support.

6. The flue gas pollutant purification device according to claim 1, characterized in that, The flue gas pollutant purification device further includes a desulfurization tower; The outlet of the desulfurization tower is communicated with the inlet of the dust collector, and the flue gas enters from the inlet of the desulfurization tower.

7. The flue gas pollutant purification device according to claim 1, characterized in that, The flue gas pollutant purification device further includes a chimney and an induced draft fan; The second outlet is communicated with the inlet of the chimney, and the flue gas is discharged from the outlet of the chimney; The induced draft fan is arranged on the connecting flue between the second outlet and the chimney.

8. The flue gas pollutant purification device according to claim 1, characterized in that, A heating device is arranged in the accommodation space.

9. The flue gas pollutant purification device according to claim 1, wherein, The dust collector is a bag filter.

10. The flue gas pollutant purification device according to claim 1, characterized in that, The flue gas heat exchanger is arranged outside the accommodation space and is located on the side of the reactor.

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