SCR (Selective Catalytic Reduction) catalytic unit conversion rate performance test board

Abstract

The utility model belongs to the technical field of SCR (Selective Catalytic Reduction) catalytic unit conversion rate performance test, and discloses an SCR catalytic unit conversion rate performance test board. The SCR catalytic unit conversion rate performance test board comprises a pipe body assembly, a front sampling port and a rear sampling port, the pipe body assembly comprises an air inlet pipeline, a main pipeline and an air outlet pipeline which are sequentially communicated, and the main pipeline is used for placing an SCR catalytic unit. The front sampling port is formed in the gas inlet pipeline or the gas inlet end of the main pipeline and used for measuring the concentration of ammonia gas and nitrogen oxide before catalysis of the SCR catalysis unit, and the rear sampling port is formed in the gas outlet end of the main pipeline or the gas outlet pipeline and used for measuring the concentration of ammonia gas and nitrogen oxide after catalysis of the SCR catalysis unit. The gas concentration measurement before catalysis and the gas concentration measurement after catalysis are carried out at the same time, gas concentration parameters before and after catalysis can be obtained in real time, the conversion rate of a catalysis unit in the reaction process can be obtained in real time, the test result is analyzed through conversion rate data, and the accuracy of the test result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR catalytic unit conversion rate performance testing, in particular to an SCR catalytic unit conversion rate performance testing platform. Background Art

[0002] Diesel exhaust contains nitrogen oxides, and the emission of nitrogen oxides will pollute the environment. Selective catalytic reduction technology (SCR) can remove nitrogen oxides contained in exhaust gas. Specifically, under high temperature conditions, ammonia is added to react with nitrogen oxides in the exhaust gas under the catalytic reduction of the SCR catalyst to generate harmless nitrogen and water to remove nitrogen oxides contained in the exhaust gas. Among them, the SCR catalyst is the most core technology of SCR, and its performance is crucial.

[0003] The SCR catalytic unit includes an SCR catalyst and a catalyst carrier. The prior art places the SCR catalytic unit in a test device to measure the conversion rate of the SCR catalytic unit. When testing the conversion rate of the SCR catalytic unit, patent CN207440067U connects a non-public gas path in parallel to the gas path of the SCR catalytic unit. One end of the non-public gas path is connected to the air inlet end of the SCR catalytic unit gas path, and the other end is connected to the air outlet end of the SCR catalytic unit. The air outlet end of the non-public gas path and the air outlet end of the SCR catalytic unit gas path are jointly merged into the detection gas path. When detecting the gas, the direction of the airflow is changed by adjusting the two three-way valves, so that the airflow only passes through the non-public gas path to detect the gas concentration before catalysis, or only passes through the SCR catalytic unit gas path for catalysis to detect the gas concentration after catalysis. However, this patent uses the same detection gas circuit to test the gas concentration before and after catalysis respectively, so that the measurement of the gas concentration before and after catalysis cannot be performed simultaneously, and the parameters of the gas concentration before and after catalysis during the reaction cannot be obtained in real time, and thus the conversion rate of the SCR catalytic unit during the reaction cannot be obtained in real time. Utility Model Content

[0004] The utility model aims to provide a SCR catalytic unit conversion rate performance test bench, which can obtain the parameters of the gas concentration before and after the catalysis in the reaction process in real time, and obtain the conversion rate of the SCR catalytic unit in the reaction process in real time, thereby increasing the accuracy of the test results.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] An SCR catalytic unit conversion rate performance test bench, comprising:

[0007] The pipe body assembly comprises an intake pipe, a main pipe and an outlet pipe which are connected in sequence, wherein the intake pipe is used to introduce ammonia, nitric oxide and nitrogen dioxide, and the main pipe is used to place the SCR catalytic unit;

[0008] A front sampling port, provided at the intake end of the intake pipe or the main pipe, for measuring the concentration of ammonia and nitrogen oxides before catalysis by the SCR catalytic unit;

[0009] The rear sampling port is arranged at the outlet end of the main pipeline or the outlet pipeline, and is used to measure the concentration of ammonia and nitrogen oxides after catalysis by the SCR catalytic unit.

[0010] Preferably, the SCR catalytic unit conversion efficiency performance test bench further comprises a vent, the air outlet end of the vent is connected to the air inlet of the air inlet pipe for letting in hot air.

[0011] Preferably, the main pipeline includes a flow pipeline and a reaction pipeline arranged in sequence along the flow direction of the gas, and the SCR catalytic unit is placed in the reaction pipeline; the SCR catalytic unit conversion performance test bench also includes a mixing element, which is arranged in the flow pipeline for mixing gas; the front sampling port is arranged at the gas outlet end of the flow pipeline.

[0012] Preferably, the flow duct includes a first duct and a second duct which are sequentially arranged along the flow direction of the gas, and the mixing element is arranged in the first duct. The SCR catalytic unit conversion performance test bench also includes a rectifying element which is arranged in the second duct and is used to adjust the flow direction of the gas.

[0013] Preferably, the mixing element includes a plurality of diffusers, and the plurality of diffusers are arranged in parallel in the flow pipe. The diffusers include a support plate and a plurality of guide plates, and the two ends of the support plate are respectively fixed to the inner wall of the flow pipe, and the plurality of guide plates are cross-arranged on the support plate at a set angle.

[0014] Preferably, the rectifying member is provided with a plurality of evenly distributed mesh holes along the flow direction of the gas.

[0015] Preferably, the rectifying member comprises a first rectifying plate and a second rectifying plate, both of which are fixed in the second pipe, and a plurality of the first rectifying plates are vertically and evenly spacedly interspersed on a plurality of the second rectifying plates to form a plurality of the meshes.

[0016] Preferably, the air inlet pipe, the main pipe and the air outlet pipe are detachably connected in sequence; or,

[0017] The air inlet pipe, the main pipe and the air outlet pipe are fixedly connected in sequence.

[0018] Preferably, the SCR catalytic unit conversion performance test bench also includes four gas analyzers, two of which are connected to the two front sampling ports, respectively, to respectively measure the concentrations of ammonia and nitrogen oxides before catalysis by the SCR catalytic unit; the other two gas analyzers are connected to the two rear sampling ports, respectively, to respectively measure the concentrations of ammonia and nitrogen oxides after catalysis by the SCR catalytic unit.

[0019] Preferably, the SCR catalytic unit conversion rate performance test bench also includes a front gas sampling tube and a rear gas sampling tube, the front gas sampling tube is arranged at the front sampling port, wherein the sampling ends of the two gas analyzers are respectively plugged into the two front gas sampling tubes; the rear gas sampling tube is arranged at the rear sampling port, and the sampling ends of the other two gas analyzers are respectively plugged into the two rear gas sampling tubes.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides an SCR catalytic unit conversion rate performance test bench, which includes a pipe body assembly, a front sampling port and a rear sampling port. The pipe body assembly includes an air intake pipe, a main pipe and an air outlet pipe which are connected in sequence. The air intake pipe is used to introduce ammonia, nitrogen monoxide and nitrogen dioxide, and the main pipe is used to place the SCR catalytic unit. The front sampling port is arranged at the air intake end of the air intake pipe or the main pipe, and is used to measure the concentration of ammonia and nitrogen oxides before the catalysis of the SCR catalytic unit. The rear sampling port is arranged at the air outlet end of the main pipe or the air outlet pipe, and is used to measure the concentration of ammonia and nitrogen oxides after the catalysis of the SCR catalytic unit, so that the measurement of the gas concentration before the catalysis and the measurement of the gas concentration after the catalysis are carried out simultaneously, and the parameters of the gas concentration before and after the catalysis in the reaction process can be obtained in real time, and the conversion rate of the catalytic unit in the reaction process can be obtained in real time, and the conversion rate data can be obtained, and then the test results are analyzed through the conversion rate data, thereby increasing the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the SCR catalytic unit conversion rate performance test bench provided by the utility model;

[0023] Figure 2 It is a structural schematic diagram of the first pipeline and the mixing element involved in the utility model;

[0024] Figure 3 It is a structural schematic diagram of the second pipeline and the rectifying component involved in the utility model.

[0025] In the figure:

[0026] 1. Tube assembly; 11. Air inlet pipe; 111. Air vent; 112. Connecting pipe; 12. Main pipe; 121. Flow pipe; 1211. First pipe; 1212. Second pipe; 122. Reaction pipe; 13. Air outlet pipe;

[0027] 2. Front sampling port;

[0028] 3. Rear sampling port;

[0029] 4. Mixing element; 41. Diffuser; 411. Support plate; 412. Guide plate;

[0030] 5. rectifier; 51. first rectifier plate; 52. second rectifier plate;

[0031] 6. Front air sampling tube;

[0032] 7. Rear gas sampling tube. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figures 1 to 3 As shown, the utility model provides a SCR catalytic unit conversion rate performance test bench, which can measure the conversion rate of different SCR catalytic units, and calculate the conversion rate of the SCR catalytic unit by measuring the ammonia concentration and nitrogen oxide concentration before and after the SCR catalytic unit, so as to evaluate the performance of the SCR catalytic unit. The SCR catalytic unit conversion rate performance test bench includes a pipe body component 1, a front sampling port 2 and a rear sampling port 3, and the pipe body component 1 includes an intake pipe 11, a main pipe 12 and an outlet pipe 13 which are connected and arranged in sequence, and the intake pipe 11 is used to pass ammonia, nitrogen monoxide and nitrogen dioxide, and the main pipe 12 is used to place the SCR catalytic unit. The front sampling port 2 is arranged at the air inlet end of the air inlet pipe 11 or the main pipe 12, and is used to measure the concentration of ammonia and nitrogen oxides before catalysis by the SCR catalytic unit. The rear sampling port 3 is arranged at the air outlet end of the main pipe 12 or the air outlet pipe 13, and is used to measure the concentration of ammonia and nitrogen oxides after catalysis by the SCR catalytic unit. The measurement of the gas concentration before catalysis and the measurement of the gas concentration after catalysis are carried out simultaneously, and the parameters of the gas concentration before and after catalysis in the reaction process can be obtained in real time, and the conversion rate of the catalytic unit in the reaction process can be obtained in real time to obtain the conversion rate data, and then the test results are analyzed through the conversion rate data, thereby increasing the accuracy of the test results.

[0038] Optionally, the SCR catalytic unit conversion rate performance test bench also includes a vent, the outlet end of the vent is connected to the air inlet of the air inlet pipe 11, and is used to pass hot air to provide high temperature conditions required for the reaction. Hot air is passed into the air inlet pipe 11 through the vent, and heat is transferred in the pipe, with good heat transfer effect and easy installation. Optionally, the vent includes a fan and a heater, the heater is connected to the outlet end of the fan, the fan is used to generate airflow, and the heater is used to heat the airflow passing through to generate hot air.

[0039] Optionally, the outer wall of the air intake pipe 11 is provided with three vents 111, and the three vents 111 are respectively used to introduce ammonia, nitric oxide and nitrogen dioxide into the air intake pipe 11 to provide the gases required for the reaction. The gases required for the reaction are inserted into the vents 111 through the air pipe for ventilation. Optionally, in this embodiment, the SCR catalytic unit conversion rate performance test bench also includes a connecting pipe 112, and the connecting pipe 112 is arranged at the vent 111. The air pipe of the gas required for the reaction is plugged into the connecting pipe 112 to make the connection more stable and prevent leakage.

[0040] Optionally, in this embodiment, the air inlet end of the air inlet pipe 11 is a straight pipe, and the air outlet end of the air inlet pipe 11 is a tapered pipe. The reaction gas is diffused through the tapered pipe, which facilitates the mixing of the reaction gases. Optionally, in this embodiment, the air outlet end of the air outlet pipe 13 is changed from a tapered pipe to a straight pipe, and the rear sampling port 3 is arranged on the straight pipe of the air outlet pipe 13, which is convenient for measurement.

[0041] Optionally, the air inlet pipe 11, the main pipe 12 and the air outlet pipe 13 are detachably connected in sequence. When not in use, it is convenient to store and save space. Alternatively, the air inlet pipe 11, the main pipe 12 and the air outlet pipe 13 are fixedly connected in sequence, which is simple to process.

[0042] Optionally, in this embodiment, the main pipeline 12 includes a flow pipeline 121 and a reaction pipeline 122 sequentially arranged along the flow direction of the gas, and the SCR catalytic unit is placed in the reaction pipeline 122; the SCR catalytic unit conversion performance test bench also includes a mixing element 4, which is arranged in the flow pipeline 121 for mixing gas; and the front sampling port 2 is arranged at the gas outlet end of the flow pipeline 121. All reaction gases are mixed by the mixing element 4 to ensure the uniformity of gas concentration, facilitate the measurement of the concentration of ammonia and nitrogen oxides before catalysis, ensure the accuracy of the gas concentration test results, make the conversion rate of nitrogen oxides low, and at the same time, avoid low reaction conversion efficiency due to gas inhomogeneity, which affects the accuracy of the SCR catalytic unit conversion rate results.

[0043] Optionally, in this embodiment, if Figure 2 As shown, the mixing element 4 includes a plurality of diffusers 41, which are arranged in parallel in the flow pipe 121. The diffusers 41 include a support plate 411 and a plurality of guide plates 412. The two ends of the support plate 411 are respectively fixed to the inner wall of the flow pipe 121, and the plurality of guide plates 412 are cross-arranged on the support plate 411 at a set angle. The guide plates 412 are used to disperse the reaction gas to ensure the uniformity of the gas concentration, and the structure is simple. Alternatively, the mixing element 4 also includes a support ring, the two ends of the support plate 411 are respectively fixed to the inner wall of the support ring, and the outer wall of the support ring is fixed to the inner wall of the flow pipe 121, which is convenient for installation.

[0044] Optionally, in this embodiment, the flow conduit 121 includes a first conduit 1211 and a second conduit 1212 sequentially arranged along the flow direction of the gas, the mixing element 4 is arranged in the first conduit 1211, and the SCR catalytic unit conversion performance test bench also includes a rectifying element 5, which is arranged in the second conduit 1212 and is used to adjust the flow direction of the gas. The rectifying element 5 adjusts the flow direction of the reaction gas, and the gas mixed evenly by the mixing element 4 is rectified to change it from a turbulent form to a laminar form, so that the mixed gas enters the SCR catalytic unit more evenly, further avoiding low reaction conversion efficiency due to gas inhomogeneity, which affects the accuracy of the SCR catalytic unit conversion result.

[0045] Optionally, the rectifying member 5 is provided with a plurality of evenly distributed meshes along the flow direction of the gas. The flow direction of the reaction gas is adjusted by a plurality of evenly distributed meshes, and the structure is simple. Figure 3 As shown, the rectifying member 5 includes a first rectifying plate 51 and a second rectifying plate 52, the first rectifying plate 51 and the second rectifying plate 52 are both fixed in the second pipe 1212, and a plurality of first rectifying plates 51 are vertically and evenly spaced and interspersed on a plurality of second rectifying plates 52 to form a plurality of meshes. Alternatively, the rectifying member 5 also includes a support ring, the first rectifying plate 51 and the second rectifying plate 52 are both fixed on the inner wall of the support ring, and the outer wall of the support ring is fixed on the inner wall of the second pipe 1212, which is convenient for installation. Optionally, in other embodiments, the rectifying member 5 includes a disc and a plurality of meshes evenly distributed along the circumference of the disc, and the outer wall of the disc is fixed on the inner wall of the second pipe 1212, which is simple to process.

[0046] Optionally, in this embodiment, a flange is provided at one end of the air inlet pipe 11 close to the first pipe 1211, flanges are provided at both ends of the first pipe 1211, the second pipe 1212 and the reaction pipe 122, and a flange is provided at one end of the air outlet pipe 13 close to the reaction pipe 122. The air inlet pipe 11, the first pipe 1211, the second pipe 1212, the reaction pipe 122 and the air outlet pipe 13 are connected in sequence through flanges for easy installation.

[0047] Optionally, the SCR catalytic unit conversion rate performance test bench also includes four gas analyzers, two of which are connected to the two front sampling ports 2 to measure the concentrations of ammonia and nitrogen oxides before the SCR catalytic unit is catalyzed; the other two gas analyzers are connected to the two rear sampling ports 3 to measure the concentrations of ammonia and nitrogen oxides after the SCR catalytic unit is catalyzed. The gas analyzer can measure the concentration of the gas to obtain the concentration parameter of the gas.

[0048] Optionally, in this embodiment, the SCR catalytic unit conversion performance test bench further includes a front gas sampling tube 6 and a rear gas sampling tube 7. The front gas sampling tube 6 is arranged at the front sampling port 2, wherein the sampling ends of two gas analyzers are respectively plugged into the two front gas sampling tubes 6; the rear gas sampling tube 7 is arranged at the rear sampling port 3, wherein the sampling ends of the other two gas analyzers are respectively plugged into the two rear gas sampling tubes 7. This makes the connection more stable and prevents leakage.

[0049] When the user tests the conversion rate of the SCR catalytic unit through the SCR catalytic unit conversion rate performance test bench, the SCR catalytic unit is placed on the main pipeline 12, hot air is introduced through the vent, and ammonia, nitrogen monoxide and nitrogen dioxide are introduced into the intake pipeline 11, wherein two gas analyzers are respectively connected to the two front sampling ports 2, and are respectively used to measure the concentrations of ammonia and nitrogen oxides before the catalysis of the SCR catalytic unit. The other two gas analyzers are respectively connected to the two rear sampling ports 3, and are respectively used to measure the concentrations of ammonia and nitrogen oxides after the catalysis of the SCR catalytic unit. By measuring the ammonia concentration and nitrogen oxide concentration before and after the catalysis of the SCR catalytic unit during the reaction process in real time, the conversion rate of the SCR catalytic unit during the reaction process is obtained in real time, and the conversion rate data is obtained, and then the test results are analyzed through the conversion rate data to evaluate the performance of the SCR catalytic unit.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A SCR catalytic unit conversion performance test bench, characterized in that: include: The pipe body assembly (1) comprises an intake pipe (11), a main pipe (12) and an outlet pipe (13) which are connected in sequence, wherein the intake pipe (11) is used to introduce ammonia, nitric oxide and nitrogen dioxide, and the main pipe (12) is used to place the SCR catalytic unit; A front sampling port (2), arranged at the intake end of the intake pipe (11) or the main pipe (12), for measuring the concentration of ammonia and nitrogen oxides before catalysis by the SCR catalytic unit; The rear sampling port (3) is arranged at the outlet end of the main pipeline (12) or the outlet pipeline (13) and is used to measure the concentration of ammonia and nitrogen oxides after catalysis by the SCR catalytic unit.

2. The SCR catalytic unit conversion performance test bench according to claim 1 is characterized in that: The SCR catalytic unit conversion rate performance test bench also includes a vent, the air outlet end of the vent is connected to the air inlet of the air inlet pipe (11) for introducing hot air.

3. The SCR catalytic unit conversion performance test bench according to claim 1, characterized in that: The main pipeline (12) comprises a flow pipeline (121) and a reaction pipeline (122) which are sequentially arranged along the flow direction of the gas, and the SCR catalytic unit is placed in the reaction pipeline (122); the SCR catalytic unit conversion performance test bench also comprises a mixing element (4), and the mixing element (4) is arranged in the flow pipeline (121) and is used for mixing gas; the front sampling port (2) is arranged at the gas outlet end of the flow pipeline (121).

4. The SCR catalytic unit conversion performance test bench according to claim 3 is characterized in that: The flow conduit (121) comprises a first conduit (1211) and a second conduit (1212) which are sequentially arranged along the flow direction of the gas, the mixing element (4) being arranged in the first conduit (1211), and the SCR catalytic unit conversion efficiency performance test bench further comprising a rectifying element (5), the rectifying element (5) being arranged in the second conduit (1212) and being used for adjusting the flow direction of the gas.

5. The SCR catalytic unit conversion performance test bench according to claim 3 is characterized in that: The mixing element (4) comprises a plurality of diffusers (41), the plurality of diffusers (41) being arranged in parallel in the flow duct (121), the diffusers (41) comprising a support plate (411) and a plurality of guide plates (412), the two ends of the support plate (411) being respectively fixed to the inner wall of the flow duct (121), and the plurality of guide plates (412) being arranged crosswise on the support plate (411) at a set angle.

6. The SCR catalytic unit conversion performance test bench according to claim 4, characterized in that: The rectifying member (5) is provided with a plurality of mesh holes which are evenly distributed along the flow direction of the gas.

7. The SCR catalytic unit conversion performance test bench according to claim 6, characterized in that: The rectifying member (5) comprises a first rectifying plate (51) and a second rectifying plate (52); the first rectifying plate (51) and the second rectifying plate (52) are both fixed in the second pipe (1212); a plurality of the first rectifying plates (51) are vertically and evenly spacedly interspersed on a plurality of the second rectifying plates (52) to form a plurality of meshes.

8. The SCR catalytic unit conversion performance test bench according to any one of claims 1 to 7, characterized in that: The air inlet pipe (11), the main pipe (12) and the air outlet pipe (13) are sequentially detachably connected; or, The air inlet pipe (11), the main pipe (12) and the air outlet pipe (13) are fixedly connected in sequence.

9. The SCR catalytic unit conversion performance test bench according to any one of claims 1 to 7, characterized in that: The SCR catalytic unit conversion rate performance test bench also includes four gas analyzers, two of which are respectively connected to the two front sampling ports (2) to respectively measure the concentrations of ammonia and nitrogen oxides before catalysis by the SCR catalytic unit; and the other two gas analyzers are respectively connected to the two rear sampling ports (3) to respectively measure the concentrations of ammonia and nitrogen oxides after catalysis by the SCR catalytic unit.

10. The SCR catalytic unit conversion performance test bench according to claim 9, characterized in that: The SCR catalytic unit conversion rate performance test bench also includes a front gas sampling tube (6) and a rear gas sampling tube (7), wherein the front gas sampling tube (6) is arranged at the front sampling port (2), wherein the sampling ends of the two gas analyzers are respectively plugged into the two front gas sampling tubes (6); and the rear gas sampling tube (7) is arranged at the rear sampling port (3), wherein the sampling ends of the other two gas analyzers are respectively plugged into the two rear gas sampling tubes (7).

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