Testing device for catalytic purification of flue gas pollutants

Abstract

The utility model relates to a testing device for catalytic purification of flue gas pollutants, which comprises a shell, a flue gas source inlet and a reducing gas source inlet are formed on the side wall of the shell, and a purified gas outlet is formed on the top wall of the shell; the pretreatment device is communicated with the flue gas source inlet; the gas mixing device is respectively communicated with the pretreatment device and the reducing gas source inlet; the catalytic purification device is communicated with the gas mixing device and is used for carrying out catalytic purification on the gas source to be treated by utilizing a catalyst, and the purified gas is discharged through the purified gas outlet; the pretreatment device, the gas mixing device and the catalytic purification device are sequentially connected and arranged in the shell. The catalyst deactivation process can be accurately simulated in a real flue gas environment, meanwhile, in-situ removal of pollutants on the surface of the catalyst is achieved, and stability of long-term continuous operation and data reliability are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of atmospheric pollution control technology, concretely relates to a kind of testing device for flue gas pollutant catalytic purification. BACKGROUND

[0002] Industrial fixed sources, such as coal / biomass boiler, cement / glass / ceramics kiln, aluminum profile casting furnace, waste incinerator, etc., their emissions of flue gas composition is complex, mainly contains CO, SO2, NOx, VOCs, heavy metals, dioxins and other pollutants. With the continuous tightening of atmospheric pollutant emission standards, catalytic purification technology as an efficient means of governance, can handle CO, NOx, VOCs and dioxins pollutants. But the existing catalytic purification performance testing device has some problems: (1) real flue gas containing fly ash particles, SO3, heavy metals and halogenated hydrocarbons and other impurities, easy to lead to catalyst surface poisoning, pore blockage and active site inactivation, directly affect the accuracy and reliability of test data. (2) After long-term operation of the device, carbon deposition, scaling and sintering layer formed on the surface of the catalyst are difficult to clean, and the catalyst must be replaced manually by disassembling the equipment, which leads to interruption of the test period and increase of operation and maintenance cost. Therefore, how to develop a catalytic purification testing device with anti-multiple pollutant interference ability and self-cleaning function is an urgent problem to be solved. SUMMARY

[0003] In view of the problems existing in the prior art, the purpose of the utility model is to provide a testing device for flue gas pollutant catalytic purification, which has anti-multiple pollutant interference ability, can accurately simulate the catalyst deactivation process in real flue gas environment, and has self-cleaning function, realizes in-situ removal of catalyst surface pollutants, and guarantees the stability and data reliability of long-term continuous operation.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A testing device for flue gas pollutant catalytic purification, comprising: a shell, a flue gas source inlet and a reducing gas source inlet are formed in the side wall of the shell, and a purification gas outlet for discharging purified gas is formed in the top wall thereof; a pretreatment device, which is in communication with the flue gas source inlet and is used for removing solid impurities in the flue gas source; a gas mixing device, which is in communication with the pretreatment device and the reducing gas source inlet respectively, and is used for heating and mixing the pretreated flue gas source and the reducing gas source to form a to-be-treated gas source; a catalytic purification device, which is in communication with the gas mixing device, uses a catalyst to catalytically purify the to-be-treated gas source, and the purified gas is discharged through the purification gas outlet; the pretreatment device, the gas mixing device and the catalytic purification device are connected in sequence and arranged in the shell.

[0006] Further, the pre-treatment device comprises a cylinder and a flow guide pipe arranged in the cylinder, a first gas inlet is formed on the upper part of the side wall of the cylinder for receiving the flue gas source, a discharge port for discharging solid impurities is formed on the lower part of the side wall, and a first gas outlet is arranged on the top wall of the cylinder, one end of the flow guide pipe is connected with the first gas outlet, and the other end of the flow guide pipe extends to the vicinity of the bottom of the cylinder for guiding the flue gas source to rise and remove impurities by gravity settling.

[0007] Further, the gas mixing device comprises a tank, a second gas inlet connected with the first gas outlet and a third gas inlet connected with the reducing gas source inlet are formed on the lower end of the tank, and a second gas outlet is formed on the upper end of the tank, at least one first heating pipe is arranged on the circumferential wall of the tank for heating and mixing the flue gas source and the reducing gas source.

[0008] Further, the catalytic purification device comprises a first chamber and a second chamber arranged side by side, and a third chamber arranged below the first chamber and the second chamber and serving as a communication, the gas inlet end of the first chamber is connected with the second gas outlet of the gas mixing device through a pipeline, the gas outlet end of the second chamber is connected with the purified gas outlet through a pipeline, a catalyst carrier for carrying a catalyst is arranged in each of the first chamber and the second chamber, and at least one second heating pipe is arranged on each of the first chamber and the second chamber.

[0009] Further, a plurality of jet disc pipes are arranged around the outer wall of each of the first chamber and the second chamber along the length direction thereof, a plurality of high-pressure nozzles are arranged on each of the jet disc pipes, the jetting ends of the high-pressure nozzles respectively extend to the inside of the first chamber or the second chamber and are directed towards the catalyst carrier.

[0010] Further, a first filter cylinder screen is arranged in the first chamber, a second filter cylinder screen is arranged in the second chamber, and the catalyst carrier is detachably arranged in the first filter cylinder screen or the second filter cylinder screen; the upper end of the first filter cylinder screen is connected with the gas inlet end of the top part of the first chamber, and the lower end thereof extends to the gas outlet end of the bottom part of the first chamber to form an airflow passage from top to bottom; the lower end of the second filter cylinder screen is connected with the gas inlet end of the bottom part of the second chamber, and the upper end thereof extends to the gas outlet end of the top part of the second chamber to form an airflow passage from bottom to top; and the second heating pipes are respectively arranged between the first filter cylinder screen and the inner wall of the first chamber and between the second filter cylinder screen and the inner wall of the second chamber.

[0011] Further, a sampling port is arranged on the pipeline between the gas outlet end of the second chamber and the purified gas outlet.

[0012] Further, the reducing gas source inlet is connected with a first gas inlet pipeline and a second gas inlet pipeline, the first gas inlet pipeline is connected to the third gas inlet and is provided with a plurality of first jet heads, and the second gas inlet pipeline is connected to a pipeline between the gas mixing device and the first chamber and is provided with a plurality of second jet heads.

[0013] Further, the side wall of the shell is provided with a flow meter and is communicated with the first gas inlet pipeline and the second gas inlet pipeline respectively, and the flow meter is used for monitoring the flow of the reducing gas source.

[0014] Further, the bottom of the shell is provided with a plurality of universal wheels.

[0015] The utility model has the advantages of the following:

[0016] 1. The utility model relates to a testing device for flue gas pollutant catalytic purification, through the cylinder and the flow guide pipe structure in the pretreatment device, guiding the flue gas source to ascend and removing solid impurities through gravity settling, avoiding the impurities such as fly ash particles in real flue gas into subsequent links, preventing it from causing catalyst surface poisoning, pore blockage and active site inactivation, thereby improving the accuracy and reliability of test data.

[0017] 2. The utility model relates to a testing device for flue gas pollutant catalytic purification, through the jet disc pipe and the high-pressure nozzle arranged around the outer wall of the first chamber and the second chamber of the catalytic purification device, clean gas can be sprayed into the chamber, and the catalyst carrier is self-cleaned. Carbon deposition, scaling and sintering layer formed on the surface of the catalyst can be effectively removed, the trouble of manually disassembling the equipment to replace the catalyst is avoided, the continuity of the test period is ensured, and the operation and maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the three-dimensional structure schematic view of the testing device for flue gas pollutant catalytic purification of the utility model.

[0019] Figure 2 It is the three-dimensional sectional view of the testing device for flue gas pollutant catalytic purification of the utility model.

[0020] Figure 3 It is another angle three-dimensional sectional view of the testing device for flue gas pollutant catalytic purification of the utility model.

[0021] Figure 4 It is the three-dimensional structure schematic view of the catalytic purification device of the utility model.

[0022] Figure 5 It is the three-dimensional structure schematic view of the pretreatment device and the gas mixing device of the utility model.

[0023] Wherein, 1 is the shell, 101 is the flue gas inlet, 102 is the reducing gas inlet, 103 is the purified gas outlet, 104 is the first air inlet pipe, 104a is the first injector, 105 is the second air inlet pipe, 105a is the second injector, 106 is the flow meter, 107 is the thermometer, 108 is the temperature controller, 109 is the sampling port, 110 is the caster wheel, 2 is the pretreatment device, 201 is the cylinder, 201a is the first air inlet, 201b is the discharge port, 201... c is the first air outlet, 202 is the guide pipe, 3 is the gas mixing device, 301 is the tank, 301a is the second air inlet, 301b is the third air inlet, 301c is the second air outlet, 302 is the first heating pipe, 4 is the catalytic purification device, 401 is the first chamber, 401a is the first filter screen, 402 is the second chamber, 402a is the second filter screen, 403 is the third chamber, 404 is the second heating pipe, 405 is the jet coil, and 406 is the high-pressure nozzle. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figure 1 and Figure 2 This document illustrates the overall structure of a test device for catalytic purification of flue gas pollutants. It mainly comprises a housing 1 and a pretreatment device 2, a gas mixing device 3, and a catalytic purification device 4, which are sequentially connected within the housing 1. The housing 1 is generally rectangular, comprising a top plate and a bottom plate, and four side walls between the top and bottom plates, forming a purification space to accommodate the pretreatment device 2, the gas mixing device 3, and the catalytic purification device 4. The side walls of the housing 1 form a flue gas inlet 101 and a reducing gas inlet 102, while the top wall forms a purified gas outlet 103 for discharging purified gas. The flue gas inlet 101 is externally connected to a fan for introducing flue gas, and the reducing gas inlet 102 is externally connected to a reducing gas cylinder via a pipeline, with a pressure of 5 MPa. The housing 1 is welded from 316L stainless steel, with a thickness of 2 mm and dimensions of 120 cm x 60 cm x 80 cm, ensuring strength and stability.

[0026] Reference Figure 2 , Figure 3 and Figure 5The pretreatment device 2 in the device is connected with the flue gas source inlet 101, and mainly functions to remove solid impurities such as fly ash particles, dust and other solid impurities in the flue gas source. The pretreatment device 2 mainly comprises a cylinder 201 and a flow guide pipe 202 arranged in the cylinder 201, wherein the cylinder 201 is in a cylindrical structure, a first gas inlet 201a for receiving the flue gas source is arranged at the upper portion of the side wall of the cylinder 201, the first gas inlet 201a is connected with the flue gas source inlet 101 through a pipeline, and the pipeline is tangentially connected with the cylinder 201, so that the flue gas source can make a cyclone downward movement along the inner wall of the cylinder 201 after entering the cylinder 201. A discharge port 201b for discharging the solid impurities is arranged at the lower portion of the side wall of the cylinder 201, and a first gas outlet 201c is arranged at the top wall of the cylinder 201, one end of the flow guide pipe 202 is connected with the first gas outlet 201c, and the other end is in an open state and extends to the vicinity of the bottom of the cylinder 201. When the flue gas source enters the cylinder 201, it moves in the above-mentioned cyclone downward manner, and then rises from the other end of the flow guide pipe 202 and is finally discharged from the first gas outlet 201c. In this process, the solid impurities in the flue gas source will stay at the bottom of the cylinder 201 due to the gravity settling effect. When the solid impurities accumulate to a certain amount, they can be discharged through the discharge port 201b.

[0027] With reference to Figure 2 , 3 and 5, the gas mixing device 3 is connected with the pretreatment device 2 and the reducing gas source inlet 102 respectively, and is used for heating and mixing the flue gas source and the reducing gas source after pretreatment, so as to form a to-be-treated gas source suitable for subsequent catalytic purification treatment. The gas mixing device 3 comprises a tank 301 located above the cylinder 201, and two gas inlets are formed at the lower end of the tank 301, wherein the second gas inlet 301a is connected with the first gas outlet 201c of the top wall of the cylinder 201 of the pretreatment device 2, so that the flue gas source after the solid impurities are removed by pretreatment can smoothly enter the tank 301, and the third gas inlet 301b is connected with the reducing gas source inlet 102, so that the reducing gas source can be introduced into the tank 301. The upper end of the tank 301 is provided with a second gas outlet 301c, and the to-be-treated gas source after heating and mixing is discharged through the second gas outlet 301c and enters the subsequent catalytic purification device 4. In order to realize heating and mixing of the flue gas source and the reducing gas source, at least one first heating pipe 302 is arranged on the circumferential wall of the tank 301, in this embodiment, the first heating pipe 302 is an annular heating pipe, the number of the first heating pipe 302 is 2, the heating temperature of the first heating pipe 302 is 300-500 ℃, the power is 800 W, and of course the number of the first heating pipe 302 can be 3, 4 or 6 and the like. The first heating pipe 302 can provide sufficient heat when working, so as to ensure that the two gases are fully mixed in the tank 301 and reach a suitable reaction temperature, thereby creating conditions for subsequent catalytic reaction.

[0028] The reducing gas source is connected to two gas inlet pipelines, i.e., a first gas inlet pipeline 104 and a second gas inlet pipeline 105, at the reducing gas source inlet 102 to optimize the gas mixing effect. The first gas inlet pipeline 104 is connected to the third gas inlet 301b of the tank body 301, and a plurality of first spray heads 104a are arranged on the pipeline. In this embodiment, the number of the first spray heads 104a is two, and the two first spray heads 104a are arranged circumferentially at the bottom of the tank body 301. The first spray heads 104a can uniformly spray the reducing gas source into the tank body 301 to fully mix with the pretreated flue gas source entering from the second gas inlet 301a. Under the action of the first heating pipeline 302, the two kinds of gases are heated and mixed in the tank body 301 to form the gas source to be treated.

[0029] The second gas inlet pipeline 105 is connected to the pipeline between the gas mixing device 3 and the catalytic purification device 4, and a plurality of second spray heads 105a are arranged on the pipeline. In this embodiment, the number of the second spray heads 105a is two, and the two second spray heads 105a are arranged circumferentially on the pipeline. The other reducing gas source introduced through the second gas inlet pipeline 105 is sprayed from the second spray heads 105a to the pipeline, so that the flue gas source and the reducing gas source can be further fully mixed before entering the catalytic purification device 4, thereby improving the efficiency and effect of the subsequent catalytic reaction.

[0030] The flow meter 106 is arranged on the side wall of the shell 1, and the flow meter 106 is in communication with the first gas inlet pipeline 104 and the second gas inlet pipeline 105 through a three-way valve. The reducing gas source is first introduced into the gas inlet end of the flow meter 106. After the flow is monitored in the flow meter 106, the reducing gas source is introduced from the gas outlet end and is divided into the first gas inlet pipeline 104 and the second gas inlet pipeline 105. The operator can adjust the distribution ratio and flow size of the reducing gas source in the two gas inlet pipelines in real time according to the actual test requirements and the specific situation of the catalytic reaction, so as to ensure the stability and reliability of the gas mixing process, and further improve the performance of the entire catalytic purification test device and the accuracy of the test results. The measurement range of the flow meter is 0-10 L / min.

[0031] Referring to Figures 2-4 The catalytic purification device 4 is in communication with the gas mixing device 3, and the gas source to be treated output from the gas mixing device 3 enters the catalytic purification device 4. The catalyst is used to catalytically purify the gas source to be treated, convert the pollutants in the gas source to be treated into harmless substances, and finally purify the gas through the purified gas outlet 103.

[0032] The catalytic purification device 4 is mainly composed of three chambers, including the first chamber 401 and the second chamber 402 arranged side by side, and the third chamber 403 located below the first chamber 401 and the second chamber 402 and serving as a communication function, so that the gas can flow orderly between the chambers. The gas inlet end of the first chamber 401 is connected to the second gas outlet 301c of the gas mixing device 3 through a pipeline, and the gas outlet end of the second chamber 402 is connected to the purified gas outlet 103 through a pipeline, and finally discharged to the external environment. The catalyst carrier for carrying the catalyst is arranged in the first chamber 401 and the second chamber 402. The structure of the catalyst carrier is various, which can be one or more of honeycomb structure, plate structure, corrugated structure or strip structure. Different structures of the catalyst carrier have different specific surface area and porosity, which can adapt to different types of catalyst and catalytic reaction requirements. Users can select appropriate catalyst carrier structure according to specific test purpose and catalytic reaction requirements to improve the efficiency and effect of catalytic purification.

[0033] The first chamber 401 and the second chamber 402 are respectively provided with at least one second heating pipe 404. In this embodiment, the second heating pipe 404 is a ring-shaped heating pipe, and the number of the second heating pipe 404 in each chamber is 3. The power of the second heating pipe is 500W, which keeps the chamber temperature in the range of 50-150℃. Of course, the number of the second heating pipe 404 can be 4, 5 or 8, etc. By adjusting the number and heating temperature of the second heating pipe 404, the reaction temperature in the chamber can be controlled to ensure that the catalyst is in the best active state, thereby improving the performance of catalytic purification.

[0034] The outer wall of the first chamber 401 and the second chamber 402 is provided with a plurality of air jet coils 405 along the length direction. The air jet coil 405 is used for jetting clean gas into the first chamber 401 or the second chamber 402 to realize the self-cleaning function of the catalyst carrier. The air jet coil 405 is provided with a plurality of high-pressure nozzles 406. The jetting end of the high-pressure nozzle 406 extends into the interior of the first chamber 401 or the second chamber 402, respectively, and faces the catalyst carrier. The high-pressure nozzle 406 is arrayed, and the number thereof is 4. The jetting direction is perpendicular to the surface of the catalyst carrier. When cleaning operation is needed, high-pressure cleaning gas is jetted into the chamber through the air jet coil 405. The cleaning gas is jetted to the surface of the catalyst carrier at high speed through the high-pressure nozzle 406, which can effectively remove the carbon deposition, scaling and other impurities on the surface of the catalyst, and restore the activity and catalytic performance of the catalyst.

[0035] The first chamber 401 is provided with a first filter screen 401a, and the second chamber 402 is provided with a second filter screen 402a, so as to further optimize the flow path of the gas in the chamber, and increase the contact area and contact time of the gas and the catalyst. A plurality of mesh holes are arranged on the circumferential wall of the first filter screen 401a and the second filter screen 402a in an array, and the high-pressure nozzle 406 passes through the chamber outer wall and the screen in sequence and faces the catalyst carrier. The catalyst carrier is detachably arranged in the first filter screen 401a or the second filter screen 402a, so as to facilitate replacement and maintenance of the catalyst carrier. The upper end of the first filter screen 401a is connected with the gas inlet end at the top of the first chamber 401, and the lower end extends to the gas outlet end at the bottom of the first chamber 401, so as to form an upward gas flow channel. After the gas source to be treated enters the first chamber 401, the gas flows downward along the gas flow channel formed by the first filter screen 401a, and fully contacts the catalyst during the flowing process, so as to perform catalytic reaction. The lower end of the second filter screen 402a is connected with the gas inlet end at the bottom of the second chamber 402, and the upper end extends to the gas outlet end at the top of the second chamber 402, so as to form a downward gas flow channel. The second heating pipe 404 is arranged between the first filter screen 401a and the inner wall of the first chamber 401, and between the second filter screen 402a and the inner wall of the second chamber 402. The gas after the catalytic reaction in the first chamber 401 enters the second chamber 402 through the third chamber 403, and then flows upward along the gas flow channel formed by the second filter screen 402a, so as to fully contact the catalyst again and perform further catalytic purification. The second heating pipe 404 is arranged between the first filter screen 401a and the inner wall of the first chamber 401, and between the second filter screen 402a and the inner wall of the second chamber 402, so as to ensure that the heat generated by the second heating pipe 404 is uniformly transmitted to each position in the chamber, and a stable temperature environment is provided for the catalytic reaction. The material of the filter screen is Inconel alloy, so as to ensure stability at high temperature.

[0036] The sampling port 109 is arranged on the pipeline between the gas outlet end of the second chamber 402 and the purified gas outlet 103. Through the sampling port 109, the gas sample after purification can be collected regularly, and the content and composition of the pollutants are detected and analyzed, so as to evaluate the performance and purification effect of the catalytic purification device 4.

[0037] Referring to Figures 1-3 The bottom of the shell 1 is provided with a plurality of universal wheels 110, which are used to move the test device to the vicinity of the flue gas source, and are provided with brake pads, so as to facilitate movement and fixation. In the embodiment, the number of universal wheels 110 is four.

[0038] The temperature meter 107 is arranged on the side wall of the shell 1, and the temperature controller 108 is electrically connected with the temperature meter 107 through a wire, so that the temperature data fed back by the temperature meter 107 can be received in real time.

[0039] The above embodiment is a preferred embodiment of the present application, but the embodiment of the present application is not limited by the above embodiment, and any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application should be an equivalent replacement mode, which is included in the protection scope of the present application. The described embodiments of the present application are intended to serve as non-limiting examples, and other embodiments can take various and alternative forms. In addition, the drawings are not necessarily to scale and can present some simplified representations of various features of the present application, including, for example, specific dimensions, directions, positions and shapes. Details associated with such features will be determined in part by the intended application and use environment of the described embodiments.

[0040] The detailed description and the accompanying drawings or diagrams support and describe the present teachings, but the scope of the present teachings is limited only by the claims. Although some of the best modes and other embodiments for carrying out the present teachings have been described in detail, various alternative designs and embodiments exist for practicing the present teachings defined in the appended claims. Furthermore, the present disclosure expressly includes combinations and sub-combinations of the elements and features set forth above and below.

Claims

1. A test apparatus for catalytic clean-up of flue gas pollutants, characterized in that, The application relates to a device for purifying flue gas, which comprises: a shell, a side wall of which is formed with a flue gas source inlet and a reducing gas source inlet, and a top wall of which is formed with a purified gas outlet for discharging purified gas; a pretreatment device, which is communicated with the flue gas source inlet and is used for removing solid impurities in the flue gas source; a gas mixing device, which is communicated with the pretreatment device and the reducing gas source inlet respectively and is used for heating and mixing the pretreated flue gas source and the reducing gas source to form a to-be-treated gas source; a catalytic purification device, which is communicated with the gas mixing device and is used for catalytically purifying the to-be-treated gas source by using a catalyst, and the purified gas is discharged through the purified gas outlet; the pretreatment device, the gas mixing device and the catalytic purification device are sequentially connected and arranged in the shell.

2. A test device for catalytic purification of flue gas pollutants according to claim 1, characterized in that, The pretreatment device comprises a cylinder and a flow guide pipe arranged in the cylinder, a first gas inlet for receiving the flue gas source is formed in the upper part of the side wall of the cylinder, a discharge port for discharging solid impurities is formed in the lower part of the side wall, and a first gas outlet is arranged in the top wall of the cylinder, one end of the flow guide pipe is connected with the first gas outlet, and the other end of the flow guide pipe extends to the vicinity of the bottom of the cylinder and is used for guiding the flue gas source to ascend and remove impurities by gravity settling.

3. A test device for catalytic purification of flue gas pollutants according to claim 2, characterized in that, The gas mixing device comprises a tank, a second gas inlet connected with the first gas outlet and a third gas inlet connected with the reducing gas source inlet are formed in the lower end of the tank, and a second gas outlet is formed in the upper end of the tank, at least one first heating pipe is arranged on the circumferential wall of the tank and is used for heating and mixing the flue gas source and the reducing gas source.

4. A test device for catalytic purification of flue gas pollutants according to claim 3, characterized in that, The catalytic purification device comprises a first chamber and a second chamber arranged side by side, and a third chamber arranged below the first chamber and the second chamber and used for communication, an inlet end of the first chamber is connected with the second gas outlet of the gas mixing device through a pipeline, an outlet end of the second chamber is connected with the purified gas outlet through a pipeline, a catalyst carrier for carrying a catalyst is arranged in the first chamber and the second chamber, and at least one second heating pipe is arranged on the catalyst carrier.

5. A test device for catalytic purification of flue gas pollutants according to claim 4, characterized in that, A plurality of jet disc pipes are arranged on the outer walls of the first chamber and the second chamber along the length direction, a plurality of high-pressure nozzles are arranged on the jet disc pipes, the jetting ends of the high-pressure nozzles respectively extend to the interiors of the first chamber or the second chamber and are directed towards the catalyst carriers.

6. A test device for catalytic purification of flue gas pollutants according to claim 4, characterized in that, The first chamber is provided with a first filter cartridge screen, the second chamber is provided with a second filter cartridge screen, and the catalyst carrier is detachably arranged in the first filter cartridge screen or the second filter cartridge screen; the upper end of the first filter cartridge screen is connected with the air inlet end at the top of the first chamber, and the lower end thereof extends to the air outlet end at the bottom of the first chamber to form an air flow passage from top to bottom; the lower end of the second filter cartridge screen is connected with the air inlet end at the bottom of the second chamber, and the upper end thereof extends to the air outlet end at the top of the second chamber to form an air flow passage from bottom to top; the second heating pipe is arranged between the first filter cartridge screen and the inner wall of the first chamber and between the second filter cartridge screen and the inner wall of the second chamber respectively.

7. A test device for catalytic purification of flue gas pollutants according to claim 4, characterized in that, A sampling port is arranged on the pipeline between the air outlet end of the second chamber and the purified gas outlet.

8. A test device for catalytic purification of flue gas pollutants according to claim 4, characterized in that, The reducing gas source inlet is connected with a first gas inlet pipeline and a second gas inlet pipeline; the first gas inlet pipeline is connected to the third gas inlet and is provided with a plurality of first jet heads; and the second gas inlet pipeline is connected to the pipeline between the gas mixing device and the first chamber and is provided with a plurality of second jet heads.

9. A test device for catalytic purification of flue gas pollutants according to claim 8, characterized in that, The side wall of the shell is provided with a flow meter in communication with the first gas inlet pipeline and the second gas inlet pipeline respectively, and the flow meter is used for monitoring the flow of the reducing gas source.

10. A test device for catalytic clean-up of flue gas pollutants according to claim 1, characterized in that, The bottom of the shell is provided with a plurality of universal wheels.

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