Denitration catalyst activity test equipment and activity test method

Abstract

The present application provides a denitration catalyst activity test device and an activity test method, which belongs to the technical field of catalyst activity testing. The equipment includes a test cylinder, an air inlet pipe, an ash shell, a driving assembly, a stirring assembly and a closing assembly. The test cylinder is used to contain dust and the catalyst to be tested. The ash shell is connected to the discharge port at the top of the test cylinder, and a plurality of leakage holes are provided at the bottom. The reciprocating motion of the ash shell is realized by the driving assembly, so that the dust is evenly spread inside the test cylinder and mixed with the reaction gas. The stirring assembly is located at the bottom of the cylinder to further stir the dust to enhance the mixing effect. In addition, the closing assembly is used to control the opening and closing of the discharge port. The present application optimizes the structural design of the ash shell to achieve uniform mixing of dust and gas, avoid the problem of dust accumulation, and improve the contact efficiency between the catalyst and the gas. The equipment operates stably and has efficient mixing performance, which can improve the accuracy and efficiency of the catalyst activity test.

Description

Technical Field

[0001] The present application relates to the technical field of catalyst activity testing, and in particular to a denitration catalyst activity testing device and an activity testing method. Background Art

[0002] With the acceleration of industrialization, air pollution is becoming increasingly serious, especially the control of nitrogen oxide (NOx) emissions has become an important environmental protection task. In order to reduce the emission of nitrogen oxides, denitrification technology is widely used in the treatment of industrial waste gas. Among them, selective catalytic reduction (SCR) technology, as the mainstream denitrification technology, relies on efficient catalysts to accelerate the reduction reaction, thereby achieving effective removal of nitrogen oxides. In this context, the performance of the catalyst directly affects the efficiency of the denitrification process, and how to evaluate the activity of the catalyst becomes particularly important. At present, how to evaluate the activity of the denitrification catalyst through efficient and reliable testing equipment has become an important technical requirement for researchers and enterprises.

[0003] At present, the equipment used to test the activity of denitration catalysts on the market mainly relies on the mixing reaction of gas and dust. However, existing equipment generally has the problem of uneven mixing, especially in the contact process between dust and gas. Due to unreasonable equipment design or limitations of mixing methods, dust cannot be evenly distributed in the reaction area, resulting in insufficient contact between catalyst and reactant, thus affecting the accuracy of activity test results. In addition, these equipment are not convenient for testing the activity of denitration catalysts under different dust concentration conditions. Summary of the invention

[0004] The present application provides a denitration catalyst activity testing device and an activity testing method, which are used to solve the problem that the existing testing equipment proposed in the above background technology has uneven mixing of dust and gas and is not convenient for performing denitration catalyst activity testing under different dust concentration conditions.

[0005] This application is implemented using the following technical solutions:

[0006] A denitration catalyst activity test device, comprising a test cylinder, an air intake pipe, an ash falling shell, a driving component, a stirring component and a sealing component;

[0007] The test cylinder is used to contain the dust required for the test and the catalyst to be tested. The top of the test cylinder is provided with at least one discharge port for adding dust into the test cylinder. The bottom of the test cylinder is fixedly connected with a discharge pipe, and the outer side of the discharge pipe is provided with a valve for controlling the discharge of the material in the test cylinder. The inside of the test cylinder is provided with a nitrogen oxide detection sensor for detecting the change of NOx concentration in the gas in the test cylinder before and after the reaction.

[0008] The air inlet pipe is connected to one side of the test cylinder and is used to introduce the reaction gas into the test cylinder; the test cylinder is fixedly connected to a connecting pipe for adding a catalyst on the side opposite to the air inlet pipe;

[0009] The ash falling shell is arranged above the interior of the test cylinder, the ash falling shell is connected to the discharge port, and a plurality of leak holes are evenly opened at the bottom of the ash falling shell for evenly spreading the dust added from the discharge port into the test cylinder through the leak holes;

[0010] The driving assembly is connected to the top of the test cylinder and is used to drive the ash falling shell to reciprocate above the test cylinder to achieve sufficient mixing of dust and reaction gas; the driving assembly includes a motor, a rotating shaft and a protrusion; the motor is fixedly installed on the top outer wall of the test cylinder, the output shaft of the motor is vertically downward and fixedly connected to the rotating shaft, the rotating shaft penetrates into the test cylinder and can rotate under the motor, the bottom end of the rotating shaft is fixedly connected to the protrusion, the protrusion contacts the ash falling shell, the ash falling shell is connected to an elastic telescopic member and is connected to the ash falling shell through the elastic telescopic member. The elastic telescopic member is connected to the inner wall of the test cylinder, and the protrusion can rotate with the rotating shaft and can push the dust falling shell when rotating; the driving assembly also includes a motor control system, and the motor control system includes a control module and a dust concentration sensor, and the dust concentration sensor is installed in the middle area of ​​the inner wall of the test cylinder, and is used to detect the dust concentration in the test cylinder in real time. The control module is electrically connected to the dust concentration sensor and can be used to receive the signal fed back by the dust concentration sensor. The motor is connected to the control module and is controlled by the control module;

[0011] The stirring assembly is arranged at the inner lower part of the test cylinder and is used to stir the dust in the test cylinder so that it is fully mixed with the incoming reaction gas;

[0012] The sealing component is installed at the feeding port of the test cylinder and is used to control the opening and closing of the feeding port.

[0013] As a further solution of the present application, two symmetrically arranged discharge ports are provided on the top of the test cylinder, and two ash falling shells are provided in the test cylinder and are respectively arranged below the two discharge ports. The cross-section of the protrusion is elliptical, and the protrusion is located between the two ash falling shells and contacts with the two ash falling shells. The protrusion can push the two ash falling shells together when rotating so that the ash falling shells can evenly spread dust in the reciprocating motion. The front and rear side walls of the two ash falling shells are respectively connected with the elastic telescopic parts, and each of the ash falling shells is connected to the inner wall of the test cylinder through the elastic telescopic parts connected to its own front and rear side walls.

[0014] As a further solution of the present application, the elastic telescopic part includes a fixed block, a telescopic rod, a connecting block and a spring; the fixed block is fixedly arranged on the outer wall of the ash falling shell, the fixed block is connected to the telescopic rod on the side away from the protrusion, the other end of the telescopic rod is fixedly connected to the connecting block, and the connecting block is fixedly connected to the inner wall of the test cylinder, the spring is sleeved on the outer side of the telescopic rod, and the two ends of the spring are respectively fixedly connected to the fixed block and the connecting block.

[0015] As a further solution of the present application, the stirring assembly includes a first rotating rod, a fixing ring, a connecting column, a triangular folding plate and a second rotating rod;

[0016] The fixing ring is located at the inner lower part of the test cylinder, and the first rotating rod and the second rotating rod are fixedly connected to the left and right sides of the fixing ring respectively. The fixing ring is rotatably connected to the inner side wall of the test cylinder through the first rotating rod and the second rotating rod on the left and right sides. A plurality of connecting columns are evenly and fixedly connected between the inner ring surfaces of the fixing ring, and the top and bottom of each connecting column are fixedly connected to the triangular folding plate. One end of the second rotating rod passes through the test cylinder and is connected to the hydraulic cylinder through a gear mechanism, and the hydraulic cylinder is used to drive the second rotating rod to rotate reciprocatingly.

[0017] As a further solution of the present application, the closing component includes a rotating door hinged on the top outer wall of the test cylinder, which is used to close the feed opening, and the top outer wall of the test cylinder is provided with an adsorption component for fixing the rotating door;

[0018] The adsorption assembly includes a magnetic block fixed on one side of the rotating door and an iron sheet fixedly connected to the top of the test cylinder. The magnetic block is adsorbed on the iron sheet to keep the rotating door stable in a closed state.

[0019] As a further solution of the present application, a pull ring is fixedly connected to the top of the rotating door.

[0020] On the other hand, the present application also provides a method for testing the activity of a denitration catalyst, using the above-mentioned denitration catalyst activity testing device, the method is as follows:

[0021] Step 1: Initial Condition Setting

[0022] According to the required dust concentration range, adjust the amount of dust added to the feed port and the amount of denitrification catalyst added to the connecting pipe to ensure that the dust concentration in the test cylinder meets the preset conditions;

[0023] Step 2: Spreading dust

[0024] The dust is evenly spread on the catalyst surface through the ash falling shell;

[0025] Step 3: Introduction of reaction gases

[0026] The reaction gas is introduced into the test cylinder through the air inlet pipe 1;

[0027] Step 4: Mixing and stirring

[0028] During the test, the motor, under the control of the control module of the motor control system, drives the ash falling shell to reciprocate to ensure that the dust is fully mixed with the reaction gas; at the same time, the stirring assembly is located at the bottom of the test cylinder to further stir the dust and catalyst to fully mix with the incoming reaction gas;

[0029] Step 5: Monitoring of Activity Testing

[0030] The dust concentration in the test cylinder is monitored by a dust concentration sensor, and under the corresponding dust concentration conditions, the concentration change of NOx in the gas in the test cylinder is monitored in real time by a nitrogen oxide detection sensor to evaluate the denitrification activity of the catalyst;

[0031] Step 6: Data Logging

[0032] The control module records the change of NOx concentration according to the feedback signal from the nitrogen oxide detection sensor;

[0033] Step 7: Activity test under different dust concentration conditions

[0034] Adjust the amount of dust added, change the initial conditions, repeat steps 1 to 6, and then compare the performance of the catalyst based on the results under different test conditions.

[0035] Compared with the prior art, this application has the following beneficial effects:

[0036] 1. The present application sets an ash falling shell so that the ash falling shell is located above the interior of the test cylinder and is connected to the discharge port. A plurality of leakage holes are provided at the bottom of the ash falling shell. This design allows the added dust to be quickly and evenly spread into the test cylinder through the discharge port and mixed with the internal gas through the ash falling shell after passing through the discharge port. The uniform layout of the plurality of leakage holes ensures that the dust will not be concentrated in a certain position, thereby avoiding the problem of uneven mixing and improving the contact efficiency between the catalyst and the reaction gas.

[0037] 2. The driving assembly of the present application is connected to the top of the test cylinder, and can drive the ash shell in the test cylinder to reciprocate. This dynamic design can ensure that the ash shell moves inside and above the test cylinder, thereby promoting the dust to be fully mixed in the gas. The dynamic reciprocating motion of the ash shell breaks the aggregation of dust, which not only reduces the possibility of dust clogging the leak hole, but also makes the dust and reaction gas mix more fully, further improving the accuracy and stability of the catalyst activity test.

[0038] 3. The present application connects the air inlet pipe to one side of the test cylinder for introducing the reaction gas. This design provides a stable gas inflow for the test, and the air inlet pipe enables the equipment to adapt to the testing requirements of a variety of reaction gases, thereby enhancing the versatility and adaptability of the equipment.

[0039] 4. The present application provides a stirring component, and after the dust is scattered, the dust accumulated at the bottom of the test cylinder can be continuously stirred by the stirring component, so that the dust can fully enter the gas in the test cylinder and mix, thereby improving the mixing effect of the test equipment.

[0040] 5. This application combines key components such as the test cylinder, ash shell, dust concentration sensor, nitrogen oxide detection sensor and control module, which can not only achieve uniform mixing of dust and reaction gas, but also realize the activity test of denitrification catalyst under different dust concentration conditions, thereby providing scientific support for the performance evaluation of denitrification catalyst under different dust concentration conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A schematic diagram of the three-dimensional structure of a denitration catalyst activity testing device proposed in one embodiment of the present application;

[0043] Figure 2 A schematic diagram of the connecting pipe assembly structure of a denitration catalyst activity test device proposed in one embodiment of the present application;

[0044] Figure 3 This is a schematic diagram of the enlarged structure of part A of a denitration catalyst activity test device proposed in one embodiment of the present application;

[0045] Figure 4 A schematic diagram of the bump assembly structure of a denitration catalyst activity test device proposed in one embodiment of the present application;

[0046] Figure 5 A schematic diagram of the three-dimensional structure of the denitration catalyst activity test device from another angle proposed in one embodiment of the present application;

[0047] Figure 6 This is a partially enlarged structural schematic diagram of a denitration catalyst activity testing device proposed in one embodiment of the present application.

[0048] In the figure: 1. air inlet pipe; 2. test cylinder; 3. iron sheet; 4. magnetic block; 5. rotating door; 6. discharge pipe; 7. pull ring; 8. leakage hole; 9. ash falling shell; 10. valve; 11. connecting pipe; 12. motor; 13. connecting block; 14. spring; 15. telescopic rod; 16. fixed block; 17. discharge port; 18. bump; 19. rotating shaft; 20. gear; 21. rack; 22. hydraulic cylinder; 23. connecting plate; 24. connecting column; 25. fixed ring; 26. rotating rod; 28. triangular folding plate; 29. ​​second rotating rod. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0050] In order to more clearly explain the purpose, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application are described in detail below. It should be noted that the described embodiments are only examples of a part of the present application, not all of them. Based on the embodiments of the present application, any other implementation methods obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0051] In the description of the present application, it should be understood that the orientation or positional relationship represented by terms such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to facilitate the description of the present application and simplify the description, and does not imply that the device or element must have a specific orientation, structure or mode of operation, and therefore should not be regarded as a limitation on the present application.

[0052] The terms "first", "second", etc. are used only to distinguish different technical features, and do not indicate the relative importance of the feature or a specific number of features. Therefore, a feature described as "first" or "second" may refer to one or more of the features. In this application, unless otherwise specified, "plurality" generally refers to two or more.

[0053] In the description of this application, it should be noted that, unless explicitly specified or specifically limited, the terms "installed", "connected", and "connected" should be interpreted in a broad sense, for example, they can refer to fixed connection, detachable connection, or integrated connection. For ordinary technicians in this field, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0054] Reference Figure 1-Figure 6 , Figure 1 A schematic diagram of the three-dimensional structure of a denitration catalyst activity testing device proposed in one embodiment of the present application; Figure 2 A schematic diagram of the connecting pipe assembly structure of a denitration catalyst activity test device proposed in one embodiment of the present application; Figure 3 This is a schematic diagram of the enlarged structure of part A of a denitration catalyst activity test device proposed in one embodiment of the present application; Figure 4 A schematic diagram of the bump assembly structure of a denitration catalyst activity test device proposed in one embodiment of the present application; Figure 5 A schematic diagram of the three-dimensional structure of the denitration catalyst activity test device from another angle proposed in one embodiment of the present application; Figure 6 This is a partial enlarged structural diagram of a denitration catalyst activity test device proposed in an embodiment of the present application. In order to solve the problems of uneven mixing of dust and gas and unstable catalyst activity test in existing equipment, this embodiment of the present application proposes a denitration catalyst activity test device. Figure 1-Figure 6 As shown, the denitration catalyst activity test equipment provided in the embodiment of the present application includes a test cylinder 2, an air intake pipe 1, an ash falling shell 9, a driving component, a stirring component and a sealing component. The specific description is as follows:

[0055] The test cylinder 2 is used to contain the dust required for the test and the catalyst to be tested. At least one discharge port 17 for adding dust into the test cylinder 2 is provided at the top of the test cylinder 2; a discharge pipe 6 is fixedly connected to the bottom of the test cylinder 2, and a valve 10 for controlling the discharge of materials in the test cylinder 2 is provided on the outside of the discharge pipe 6. A nitrogen oxide detection sensor is provided inside the test cylinder 2 to detect the change in NOx concentration in the gas in the test cylinder 2 before and after the reaction. The setting of the discharge pipe 6 and the combination of the valve 10 on its outside can conveniently control the discharge of materials after the test, ensuring the efficiency and cleanliness of the experimental process. This method simplifies the material management process in structure, making the operation more efficient and convenient.

[0056] The air inlet pipe 1 is connected to one side of the test cylinder 2 and is used to introduce the reaction gas into the test cylinder 2 ; the test cylinder 2 is fixedly connected with a connecting pipe 11 for adding a catalyst on the side opposite to the air inlet pipe 1 .

[0057] The ash falling shell 9 is arranged above the inside of the test cylinder 2. The ash falling shell 9 is connected to the discharge port 17. A plurality of leakage holes 8 are evenly opened at the bottom of the ash falling shell 9 for evenly spreading the dust added from the discharge port 17 into the test cylinder 2 through the leakage holes 8.

[0058] A driving assembly is connected to the top of the test cylinder 2 and is used to drive the ash falling shell 9 to reciprocate above the test cylinder 2 to achieve sufficient mixing of dust and reaction gas; the driving assembly includes a motor 12, a rotating shaft 19 and a protrusion 18; the motor 12 is fixedly installed on the top outer wall of the test cylinder 2, the output shaft of the motor 12 is vertically downward and fixedly connected to the rotating shaft 19, the rotating shaft 19 penetrates into the test cylinder 2 and can rotate under the motor 12, the bottom end of the rotating shaft 19 is fixedly connected to the protrusion 18, the protrusion 18 is in contact with the ash falling shell 9, and the ash falling shell 9 is connected to an elastic telescopic member and is connected to the test cylinder 2 through the elastic telescopic member. The inner wall of the cylinder 2 is connected, the protrusion 18 can rotate with the rotating shaft 19 and can push the ash shell 9 when rotating; the driving component also includes a motor control system, the motor control system includes a control module and a dust concentration sensor, the dust concentration sensor is installed in the middle area of ​​the inner wall of the test cylinder 2, and is used to detect the dust concentration in the test cylinder 2 in real time. The control module is electrically connected to the dust concentration sensor and can be used to receive the signal fed back by the dust concentration sensor. The motor 12 is connected to the control module and is controlled by the control module; the control module is also connected to the nitrogen oxide detection sensor in the test cylinder 2.

[0059] The stirring assembly is arranged at the inner lower part of the test cylinder 2 and is used to stir the dust in the test cylinder 2 so as to fully mix the dust with the incoming reaction gas.

[0060] The closing assembly is installed at the feeding port 17 of the test cylinder 2 and is used to control the opening and closing of the feeding port.

[0061] The denitrification catalyst activity test equipment provided in the embodiment of the present application is provided with an ash falling shell 9 so that the ash falling shell 9 is located above the interior of the test cylinder 2 and is connected to the discharge port 17. A plurality of leakage holes 8 are provided at the bottom of the ash falling shell 9. This design allows the added dust to be quickly and evenly spread into the test cylinder 2 through the ash falling shell 9 after passing through the discharge port 17 and mixed with the internal gas. The uniform layout of the plurality of leakage holes 8 ensures that the dust will not be concentrated in a certain position, thereby avoiding the problem of uneven mixing and improving the contact efficiency between the catalyst and the reaction gas.

[0062] The driving component of the embodiment of the present application is connected to the top of the test cylinder 2, and can drive the ash shell 9 in the test cylinder 2 to reciprocate. This dynamic design can ensure that the ash shell 9 moves inside and above the test cylinder 2, thereby promoting the dust to be fully mixed in the gas. The dynamic reciprocating motion of the ash shell 9 breaks the aggregation state of the dust, which not only reduces the possibility of dust clogging the leakage hole 8, but also makes the dust and reaction gas mix more fully, further improving the accuracy and stability of the catalyst activity test.

[0063] In the embodiment of the present application, the air inlet pipe 1 is connected to one side of the test cylinder 2 for introducing the reaction gas. This design provides a stable gas inflow for the test, and through the air inlet pipe 1, the device can adapt to the testing requirements of various reaction gases, thereby enhancing the versatility and adaptability of the device.

[0064] The embodiment of the present application provides a stirring component. After the dust is scattered, the stirring component can continuously stir the dust accumulated at the bottom of the test cylinder 2, so that the dust can fully enter the gas in the test cylinder 2 and mix, thereby improving the mixing effect of the test equipment.

[0065] The embodiment of the present application combines key components such as the test cylinder 2, the ash shell 9, the dust concentration sensor, the nitrogen oxide detection sensor and the control module, which can not only achieve uniform mixing of dust and reaction gas, but also realize the activity test of the denitrification catalyst under different dust concentration conditions, thereby providing scientific support for the performance evaluation of the denitrification catalyst under different dust concentration conditions.

[0066] The denitration catalyst activity test equipment sets an ash shell 9 with multiple leak holes 8 inside the test cylinder 2, and cooperates with the driving component to push the ash shell 9 to move back and forth, so that the dust can be evenly spread into the test cylinder 2, thereby achieving full mixing of the dust and the reaction gas. At the same time, the dust in the test cylinder 2 is further stirred by the stirring component to ensure full contact between the dust and the gas, thereby improving the stability and repeatability of the test. It can be seen that the embodiment of the present application effectively solves the problems of uneven mixing of dust and gas and unstable catalyst activity test through the optimized design of the ash shell 9, the dynamic driving component and the flexible setting of the intake pipe 1, and can ensure full contact between the catalyst and the reaction gas during use, thereby improving the accuracy and reliability of the test.

[0067] In the present embodiment, the driving assembly adopts a combination design of a motor 12, a rotating shaft 19 and a projection 18. During use, the output shaft of the motor 12 does not need to be directly connected to the ash shell 9, but the projection 18 is driven to rotate by the rotating shaft 19 connected to the output shaft of the motor 12, and then the ash shell 9 in contact with the projection 18 is continuously pushed when the projection 18 rotates, so that the ash shell 9 reciprocates in the horizontal direction in the test cylinder 2. This driving design mode of the motor 12 provides a stable and powerful power, making the movement of the ash shell more efficient and reliable. The speed and torque of the motor 12 can be adjusted according to the mixing needs to ensure that the movement frequency of the ash shell 9 matches the dust spreading requirements. In addition, the ash shell 9 is connected to the inner wall of the test cylinder 2 through an elastic telescopic member, giving it elastic recovery ability. When the projection 18 pushes the ash shell 9, the elastic telescopic member can generate a reverse force. When the projection 18 does not push, the elastic telescopic member will release its own stored kinetic energy to help the ash shell 9 return to its initial position. This design enables the ash falling shell 9 to maintain a relatively smooth reciprocating motion during continuous movement, reduces unstable factors caused by mechanical friction or impact, and improves the durability and reliability of the equipment.

[0068] In the denitration catalyst activity test equipment provided in the embodiment of the present application, the activity test of the denitration catalyst is mainly carried out in the test cylinder 2, and the test cylinder 2 is used to accommodate the denitration catalyst to be tested for activity and the dust that can provide dust conditions. The connecting pipe 11 can be used for adding the denitration catalyst to enter the test cylinder 2. The bottom of the test cylinder 2 is fixedly connected with a discharge pipe 6 to facilitate the discharge of materials after the test is completed. The test cylinder 2 is equipped with a nitrogen oxide detection sensor, which can be used to detect the change in NOx concentration in the gas in the test cylinder 2 before and after the reaction in real time. The specific process of using the denitration catalyst activity test equipment of the embodiment of the present application to perform a catalyst activity test is as follows:

[0069] Step 1: Addition of catalyst

[0070] The denitration catalyst to be tested for activity is added into the test cylinder 2 through the connecting pipe 11 .

[0071] Step 2: Spreading dust

[0072] The dust is evenly spread from the ash falling shell 9 to the catalyst surface through the discharge port 17. The bottom of the ash falling shell 9 is provided with a plurality of leak holes 8, so that the added dust can be evenly dispersed to avoid accumulation.

[0073] Step 3: Introduction of gas

[0074] The reaction gas is introduced into the test cylinder 2 through the air inlet pipe 1; the reaction gas is a mixed gas containing NOx (nitrogen oxide) gas, NH3 and other gases, such as a mixed gas of water vapor, CO2, O2, N2, SO2 and NH3.

[0075] Step 4: Mixing and stirring

[0076] During the test, the motor 12 drives the ash shell 9 to reciprocate under the control of the control module of the motor control system to ensure that the dust is fully mixed with the reaction gas; at the same time, the stirring assembly is located at the bottom of the test cylinder 2 to further stir the dust and catalyst and fully mix them with the incoming reaction gas.

[0077] Step 5: Monitoring of Activity Testing

[0078] The concentration change of NOx in the gas in the test cylinder 2 is monitored in real time by a nitrogen oxide detection sensor; the nitrogen oxide detection sensor is connected to a control module, and the control module can receive the detected NOx concentration data for real-time analysis.

[0079] Step 6: Data Logging

[0080] The control module records the changes in NOx concentration based on the feedback signal from the nitrogen oxide detection sensor.

[0081] Furthermore, the test conditions can be adjusted based on these data to ensure that the activity of the catalyst is accurately assessed.

[0082] In some embodiments, two symmetrically arranged discharge ports 17 are provided on the top of the test cylinder 2, and two ash shells 9 are provided in the test cylinder 2 and are respectively arranged below the two discharge ports 17. The cross-section of the protrusion 18 is elliptical. The protrusion 18 is located between the two ash shells 9 and contacts the two ash shells 9. The protrusion 18 can push the two ash shells 9 together when rotating so that the ash shells 9 can evenly spread the dust in the reciprocating motion. The front and rear side walls of the two ash shells 9 are respectively connected with elastic telescopic parts, and each ash shell 9 is connected to the inner wall of the test cylinder 2 through the elastic telescopic parts connected to its own front and rear side walls.

[0083] In this embodiment, firstly, the design of two symmetrically arranged discharge ports 17 and two ash shells 9 significantly improves the uniformity of dust spreading. This embodiment adopts the contact between the end of the protrusion 18 with an elliptical cross-section and the two ash shells 9, and the protrusion 18 can simultaneously push the two ash shells 9 to reciprocate when rotating. The elliptical protrusion design allows it to apply forces in different directions during rotation, ensuring that each ash shell is subjected to uniform driving force in a cycle, thereby avoiding the asymmetric or uneven dust distribution that may be caused by single-direction movement. This double-shell design expands the dust spreading area more effectively than a single shell, ensuring that the dust in the entire test cylinder 2 can be evenly dispersed and fully contacted with the gas, avoiding local dust accumulation, and further improving the accuracy and repeatability of the catalyst activity test.

[0084] Secondly, the two ash falling shells 9 are connected to the inner wall of the test cylinder 2 through elastic telescopic parts. This design has good buffering and stability in structure. The function of the elastic telescopic parts is not only to absorb the impact force generated by the protrusion 18 when pushing the ash falling shell 9, but also to provide the reciprocating motion of the ash falling shell 9 with the ability of automatic reset. After the reciprocating motion, each ash falling shell 9 can quickly return to its initial position under the action of the elastic telescopic parts to ensure the regularity and consistency of movement within each working cycle. This design can reduce mechanical wear and extend the service life of the equipment. At the same time, when the ash falling shell is subjected to external force, it has a certain adaptive ability to maintain the smoothness and continuity of the movement. In addition, through the coordinated movement of the two ash falling shells 9, the dust spreading effect is more uniform. Combined with the stable support of the elastic telescopic parts, this setting effectively improves the overall reliability and operating efficiency of the equipment.

[0085] In some embodiments, the elastic telescopic member includes a fixed block 16, a telescopic rod 15, a connecting block 13 and a spring 14; the fixed block 16 is fixedly arranged on the outer wall of the dust falling shell 9, and the fixed block 16 is connected to the telescopic rod 15 on the side away from the protrusion 18, and the other end of the telescopic rod 15 is fixedly connected to the connecting block 13, and the connecting block 13 is fixedly connected to the inner wall of the test cylinder 2, and the outer side of the telescopic rod 15 is sleeved with a spring 14, and the two ends of the spring 14 are respectively fixedly connected to the fixed block 16 and the connecting block 13.

[0086] In this embodiment, firstly, the setting of the elastic telescopic parts, including the fixed block 16, the telescopic rod 15, the connecting block 13 and the spring 14, can effectively ensure the stability and flexibility of the ash falling shell 9 during reciprocating motion through the synergistic effect of these parts. In application, the fixed block 16 is firmly mounted on the outer wall of the ash falling shell 9 and is connected to the inner wall of the test cylinder 2 through the telescopic rod 15. This structural design ensures that the ash falling shell 9 always remains on a fixed track when pushed by the protrusion 18, avoiding deviation or shaking during movement. The function of the telescopic rod 15 enables the movement of the ash falling shell 9 to have a flexible adjustment range and to adapt to different workloads. The external spring 14 provides further buffering, which can absorb the impact force from the protrusion 18 and quickly reset the ash falling shell 9 after the pushing is completed. This automatic reset function not only reduces mechanical wear and extends the service life of the equipment, but also improves the stability of the system.

[0087] Secondly, the key role of the spring 14 in this design is reflected in its buffering and resetting capabilities. As the protrusion 18 pushes the ash shell 9 to move, the spring 14 is gradually compressed and accumulates energy. When the driving force disappears, the spring 14 releases energy and restores the ash shell 9 to its initial position. This design ensures that the ash shell 9 can perform continuous reciprocating motion at a high rate without lagging due to resistance or friction. This system not only improves the operating efficiency of the equipment, but also greatly reduces the impact of vibration and impact on the structure, ensuring the stability of the equipment during high-frequency operation. This motion control method can effectively ensure that the dust is evenly distributed in the test cylinder 2, avoid dust accumulation, and improve mixing efficiency and equipment performance. Especially in the highly demanding catalyst testing process, more accurate and reliable results are ensured.

[0088] The elastic telescopic parts designed in the above manner have the characteristics of compact structure, smooth operation and easy maintenance, which greatly improves the durability and performance of the equipment.

[0089] In some embodiments, the stirring assembly includes a first rotating rod 26 , a fixing ring 25 , a connecting column 24 , a triangular folding plate 28 and a second rotating rod 29 .

[0090] Among them, the fixing ring 25 is located at the inner lower part of the test cylinder 2, and the left and right sides of the fixing ring 25 are respectively fixedly connected with the first rotating rod 26 and the second rotating rod 29, and the fixing ring 25 is rotatably connected to the inner side wall of the test cylinder 2 through the first rotating rod 26 and the second rotating rod 29 on the left and right sides, and a plurality of connecting columns 24 are evenly fixedly connected between the inner ring surfaces of the fixing ring 25, and the top and bottom of each connecting column 24 are fixedly connected with a triangular folding plate 28, and one end of the second rotating rod 29 passes through the test cylinder 2 and is connected to the hydraulic cylinder 22 through a gear mechanism, and the hydraulic cylinder is used to drive the second rotating rod 29 to reciprocate. Optionally, in this embodiment, the gear mechanism includes a gear 20 and a rack 21, and the end of the second rotating rod 29 passing through the test cylinder 2 is connected with the gear 20, and the outer side wall of the test cylinder 2 is fixedly connected with a connecting plate 23 located next to the gear 20, and one side of the connecting plate 23 is fixedly connected with the hydraulic cylinder 22, and one end of the hydraulic rod of the hydraulic cylinder 22 is fixedly connected with the rack 21, and the rack 21 is meshed with the gear 20.

[0091] The stirring assembly of this embodiment is provided with a first rotating rod 26 and a second rotating rod 29 on the left and right sides of the fixed ring 25, and a plurality of connecting columns 24 are evenly fixedly connected between the inner ring surface of the fixed ring 25, and a triangular folding plate 28 is fixedly connected to the top and bottom of each connecting column 24. The design of multiple connecting columns 24 and the triangular folding plates 28 connected to the fixed ring 25 increases the complexity and stirring efficiency in the structure, and can produce a strong stirring effect in the test cylinder 2 when the fixed ring 25 rotates, so that the dust and the reaction gas are mixed more fully, thereby effectively improving the mixing uniformity. At the same time, in this embodiment, the second rotating rod 29 is connected to the hydraulic cylinder 22 through a gear mechanism. This method has high flexibility and responsiveness and can better adapt to various operating conditions. Therefore, the reciprocating rotation of the second rotating rod 29 can be driven by the hydraulic cylinder 22 in the application, thereby driving the reciprocating rotation of the fixed ring 25, and this driving method not only makes the stirring direction constantly changeable, but also the stirring frequency and strength are adjustable, and the stirring intensity can be flexibly adjusted according to different test requirements. This precise control improves the flexibility of the catalyst activity test.

[0092] In some embodiments, the closing component includes a rotating door 5 hinged on the top outer wall of the test cylinder 2 for closing the feed opening 17 , and the top outer wall of the test cylinder 2 is provided with an adsorption component for fixing the rotating door 5 .

[0093] The adsorption assembly includes a magnetic block 4 fixed to one side of the rotating door 5 and an iron sheet 3 fixedly connected to the top of the test cylinder 2. The magnetic block 4 is adsorbed to the iron sheet 3 to keep the rotating door 5 stable in a closed state.

[0094] In this embodiment, the sealing component adopts a rotating door 5 hinged on the top outer wall of the test cylinder 2. This design combined with the adsorption component can effectively prevent dust leakage and ensure the sealing during the test. In addition, this design improves the stability of the experimental environment and reduces the interference of external factors on the test results.

[0095] In some embodiments, a pull ring 7 is fixedly connected to the top of the revolving door 5. The design of the pull ring 7 makes the opening and closing of the revolving door 5 more convenient, and enhances the user-friendliness of the device.

[0096] In addition, the denitration catalyst activity test equipment of the embodiment of the present application is also equipped with a dust concentration sensor in the middle area of ​​the inner wall of the test cylinder 2, which is used to detect the dust concentration in the test cylinder 2 in real time. Moreover, the dust concentration sensor is electrically connected and can feedback the detected dust concentration data to the control module so as to adjust the test conditions according to these feedback data. In addition, the setting of the dust concentration sensor can also enable the activity test equipment of this embodiment to perform the activity test of the denitration catalyst under different dust concentration conditions. The specific process is as follows:

[0097] Step 1: Initial Condition Setting

[0098] According to the required dust concentration range, adjust the amount of dust added to the feed port 17 and the amount of denitration catalyst added to the connecting pipe 11 to ensure that the dust concentration in the test cylinder 2 meets the preset conditions. By setting the initial conditions, the amount of dust and denitration catalyst added can be flexibly adjusted to meet the needs of different dust concentration conditions and lay a good foundation for subsequent activity tests.

[0099] Step 2: Spreading dust

[0100] The dust is evenly spread on the catalyst surface by the dust falling shell 9. The reciprocating motion of the dust falling shell 9 can ensure that the dust will not accumulate at a certain position under different dust concentration conditions.

[0101] Step 3: Introduction of reaction gases

[0102] The reaction gas is introduced into the test cylinder 2 through the air inlet pipe 1; the reaction gas is a mixed gas containing NOx (nitrogen oxide) gas, NH3 and other gases, such as a mixed gas of water vapor, CO2, O2, N2, SO2 and NH3.

[0103] Step 4: Mixing and stirring

[0104] During the test, the motor 12, under the control of the control module of the motor control system, drives the ash shell 9 to reciprocate to ensure that the dust and the reaction gas are fully mixed; at the same time, the stirring assembly is located at the bottom of the test cylinder 2 to further stir the dust and catalyst and fully mix them with the incoming reaction gas. In this step, the reciprocating motion of the ash shell 9 and the auxiliary effect of the stirring assembly can ensure the full mixing of dust, gas and catalyst. This design avoids the problem of dust accumulation or uneven distribution, and ensures the stability and repeatability of the test data. Moreover, this mixing process improves the contact efficiency between the gas and the catalyst, making the catalytic reaction more thorough, thereby ensuring the accuracy of the test results.

[0105] Step 5: Monitoring of Activity Testing

[0106] The dust concentration in the test cylinder 2 is monitored by a dust concentration sensor, so that under the corresponding dust concentration conditions, the concentration change of NOx in the gas in the test cylinder 2 is monitored in real time by a nitrogen oxide detection sensor to evaluate the denitration activity of the catalyst; the dust concentration sensor and the nitrogen oxide detection sensor are both connected to the control module, and the control module can receive the detected dust concentration data and the detected NOx concentration data for real-time analysis. The test method of this embodiment realizes real-time monitoring of dust concentration and NOx concentration through the combination of a dust concentration sensor and a nitrogen oxide detection sensor. Moreover, the control module is connected and used in combination with the dust concentration sensor and the nitrogen oxide detection sensor, and can flexibly make test adjustments according to the test data during the test process, which can better realize the denitration catalyst activity test.

[0107] Step 6: Data Logging

[0108] The control module records the changes in NOx concentration based on the feedback signal from the nitrogen oxide detection sensor, thereby providing detailed data support for further performance analysis.

[0109] Step 7: Activity test under different dust concentration conditions

[0110] Adjust the amount of dust added, change the initial conditions, repeat steps 1 to 6, and then compare the performance of the catalyst based on the results under different test conditions. This method can achieve multiple tests of the activity of the denitration catalyst under different concentration conditions. By changing the initial conditions and repeating the previous steps, the performance changes of the denitration catalyst under various dust concentration conditions can be accurately analyzed. This process provides important data support for the selection and optimization of denitration catalysts in practical applications.

[0111] In summary, the denitration catalyst activity test equipment of the embodiment of the present application significantly improves the overall performance and operating efficiency of the equipment through the combination of multiple innovative structures. First, the driving structure of the motor 12, the rotating shaft 19 and the protrusion 18 enables the ash shell 9 to reciprocate smoothly and effectively, ensuring the uniform spreading of the dust. The elastic telescopic part, through the synergistic effect of the telescopic rod 15 and the spring 14, not only absorbs the impact force generated during the movement, but also ensures that the ash shell 9 can be smoothly reset after the spreading is completed, thereby improving the durability and operational stability of the equipment. In addition, the combination of the dust concentration sensor and the control module realizes the intelligent adjustment function of the equipment, which can automatically adjust the speed of the motor 12 according to the real-time monitoring situation, ensure the full mixing of dust and gas under different conditions, and further improve the accuracy and consistency of the test.

[0112] Through these unique designs, the denitration catalyst activity test equipment provided in the embodiments of the present application has strong versatility and adaptability, and can meet the needs of various types of catalyst activity tests. During the test process, not only can the uniformity of the mixing effect be guaranteed, but also the contact effect between dust and gas is optimized through the stirring assembly and the automatic control system, ensuring the repeatability and stability of the test. This design not only improves the operating efficiency of the equipment, but also significantly reduces maintenance costs, and has a wide range of application potential.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A denitration catalyst activity testing device, characterized in that: It comprises a test cylinder (2), an air intake pipe (1), an ash falling shell (9), a driving component, a stirring component and a sealing component; The test cylinder (2) is used to contain dust required for the test and the catalyst to be tested. The top of the test cylinder (2) is provided with at least one discharge port (17) for adding dust into the test cylinder (2). The bottom of the test cylinder (2) is fixedly connected with a discharge pipe (6). The outer side of the discharge pipe (6) is provided with a valve (10) for controlling the discharge of materials in the test cylinder (2). The interior of the test cylinder (2) is provided with a nitrogen oxide detection sensor for detecting the change in NOx concentration in the gas in the test cylinder (2) before and after the reaction. The air inlet pipe (1) is connected to one side of the test cylinder (2) and is used to introduce the reaction gas into the test cylinder (2); the test cylinder (2) is fixedly connected to a connecting pipe (11) for adding a catalyst on a side opposite to the air inlet pipe (1); The ash falling shell (9) is arranged above the interior of the test cylinder (2), the ash falling shell (9) is connected to the discharge port (17), and a plurality of leakage holes (8) are evenly opened at the bottom of the ash falling shell (9), so as to evenly spread the dust added from the discharge port (17) into the test cylinder (2) through the leakage holes (8); The driving assembly is connected to the top of the test cylinder (2) and is used to drive the ash falling shell (9) to reciprocate above the test cylinder (2) to achieve sufficient mixing of dust and reaction gas; the driving assembly comprises a motor (12), a rotating shaft (19) and a protrusion (18); the motor (12) is fixedly mounted on the top outer wall of the test cylinder (2); the output shaft of the motor (12) is vertically downward and fixedly connected to the rotating shaft (19); the rotating shaft (19) penetrates into the test cylinder (2) and can rotate under the motor (12); the bottom end of the rotating shaft (19) is fixedly connected to the protrusion (18); the protrusion (18) is in contact with the ash falling shell (9); the ash falling shell (9) is connected to an elastic telescopic member and The protrusion (18) is connected to the inner wall of the test cylinder (2) through the elastic expansion member, and can rotate with the rotating shaft (19) and can push the dust falling shell (9) when rotating; the driving component also includes a motor control system, and the motor control system includes a control module and a dust concentration sensor. The dust concentration sensor is installed in the middle area of ​​the inner wall of the test cylinder (2) and is used to detect the dust concentration in the test cylinder (2) in real time. The control module is electrically connected to the dust concentration sensor and can be used to receive a signal fed back by the dust concentration sensor. The motor (12) is connected to the control module and is controlled by the control module; the control module is also connected to the nitrogen oxide detection sensor in the test cylinder (2); The stirring assembly is arranged at the inner lower part of the test cylinder (2) and is used to stir the dust in the test cylinder (2) so that the dust is fully mixed with the incoming reaction gas; the stirring assembly comprises a first rotating rod (26), a fixing ring (25), a connecting column (24), a triangular folding plate (28) and a second rotating rod (29); the fixing ring (25) is located at the inner lower part of the test cylinder (2), the first rotating rod (26) and the second rotating rod (29) are fixedly connected to the left and right sides of the fixing ring (25), respectively, and the fixing ring (25) is connected to the first rotating rod (26) and the second rotating rod (29) ) is rotatably connected to the inner wall of the test cylinder (2) through the first rotating rod (26) and the second rotating rod (29) on the left and right sides, a plurality of the connecting columns (24) are evenly and fixedly connected between the inner ring surface of the fixing ring (25), and the top and bottom of each connecting column (24) are fixedly connected to the triangular folding plate (28), one end of the second rotating rod (29) passes through the test cylinder (2) and is connected to the hydraulic cylinder (22) through a gear mechanism, and the hydraulic cylinder is used to drive the second rotating rod (29) to reciprocate; The sealing component is installed at the discharge port (17) of the test cylinder (2) and is used to control the opening and closing of the discharge port.

2. The denitration catalyst activity testing equipment according to claim 1, characterized in that: The top of the test cylinder (2) is provided with two symmetrically arranged discharge ports (17), and the test cylinder (2) is provided with two ash falling shells (9) respectively arranged below the two discharge ports (17), and the cross-section of the protrusion (18) is elliptical, and the protrusion (18) is located between the two ash falling shells (9) and in contact with the two ash falling shells (9), and the protrusion (18) can push the two ash falling shells (9) together when rotating so that the ash falling shells (9) can evenly spread dust in a reciprocating motion, and the front and rear side walls of the two ash falling shells (9) are respectively connected to the elastic telescopic parts, and each of the ash falling shells (9) is connected to the inner wall of the test cylinder (2) through the elastic telescopic parts connected to its front and rear side walls.

3. The denitration catalyst activity testing device according to claim 2, characterized in that: The elastic telescopic component comprises a fixed block (16), a telescopic rod (15), a connecting block (13) and a spring (14); the fixed block (16) is fixedly arranged on the outer wall of the ash falling shell (9); the fixed block (16) is connected to the telescopic rod (15) on a side away from the protrusion (18); the other end of the telescopic rod (15) is fixedly connected to the connecting block (13); the connecting block (13) is fixedly connected to the inner wall of the test cylinder (2); the outer side of the telescopic rod (15) is sleeved with the spring (14); and the two ends of the spring (14) are fixedly connected to the fixed block (16) and the connecting block (13) respectively.

4. The denitration catalyst activity testing device according to claim 1, characterized in that: The closing component comprises a rotating door (5) hinged on the top outer wall of the test cylinder (2) and used to close the feed opening (17); the top outer wall of the test cylinder (2) is provided with an adsorption component for fixing the rotating door (5); The adsorption assembly comprises a magnetic block (4) fixed to one side of the rotating door (5) and an iron sheet (3) fixedly connected to the top of the test cylinder (2); the magnetic block (4) and the iron sheet (3) are adsorbed to maintain the stability of the rotating door (5) when it is in a closed state.

5. A denitration catalyst activity testing device according to claim 4, characterized in that: A pull ring (7) is fixedly connected to the top of the rotating door (5).

6. A method for testing the activity of a denitration catalyst, characterized in that: The denitration catalyst activity test equipment according to any one of claims 1 to 5 is used, and the method is as follows: Step 1: Initial Condition Setting According to the required dust concentration range, the amount of dust added to the feed port (17) and the amount of denitration catalyst added to the connecting pipe (11) are adjusted to ensure that the dust concentration in the test cylinder (2) meets the preset conditions; Step 2: Spreading dust The dust is evenly spread on the catalyst surface through the dust falling shell (9); Step 3: Introduction of reaction gases Introducing the reaction gas into the test cylinder (2) through the air inlet pipe (1); Step 4: Mixing and stirring During the test, the motor (12) drives the dust drop shell (9) to reciprocate under the control of the control module of the motor control system to ensure that the dust is fully mixed with the reaction gas; at the same time, the stirring assembly is located at the bottom of the test cylinder (2) to further stir the dust and catalyst to fully mix them with the incoming reaction gas; Step 5: Monitoring of Activity Testing The dust concentration in the test cylinder (2) is monitored by a dust concentration sensor, and under corresponding dust concentration conditions, the concentration change of NOx in the gas in the test cylinder (2) is monitored in real time by a nitrogen oxide detection sensor to evaluate the denitration activity of the catalyst; Step 6: Data Logging The control module records the change of NOx concentration according to the feedback signal from the nitrogen oxide detection sensor; Step 7: Activity test under different dust concentration conditions Adjust the amount of dust added, change the initial conditions, repeat steps 1 to 6, and then compare the performance of the catalyst based on the results under different test conditions.

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