System for testing performance of SCR denitration catalyst applicable to multiple scenes

Abstract

The utility model relates to a system for testing the performance of an SCR denitration catalyst applicable to multiple scenes, and the system comprises a flue gas unit which comprises a nitrogen supply device and a flue gas access device; the ammonia gas generation unit is used for providing ammonia gas; the dust feeding unit is used for feeding dust and controlling the dust feeding amount so as to simulate the dust arrangement mode of SCR (Selective Catalytic Reduction); the mixed heating unit is respectively connected with the flue gas unit, the ammonia gas generation unit and the dust adding unit; the reaction unit is connected with the mixing and heating unit and comprises a reaction chamber and a catalyst fixing device, and a catalyst is fixed on the catalyst fixing device; the detection unit is respectively connected with the inlet and the outlet of the reaction unit, and the detection unit is used for sampling and detecting the inlet and the outlet of the reaction chamber. The field actual reaction process can be truly and accurately restored, and meanwhile, multi-working-condition test conditions are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of SCR denitration catalyst performance testing, in particular to a multi-scene applicable SCR denitration catalyst performance testing system. BACKGROUND

[0002] The selective catalytic reduction (SCR) denitration technology is one of the most widely used flue gas denitration technologies at present, and its core lies in the performance of the SCR denitration catalyst. Accurate testing of the performance of the SCR denitration catalyst is of great significance for optimizing the denitration process, improving the denitration efficiency, and ensuring environmental protection standards.

[0003] However, the existing SCR denitration catalyst performance testing often has some limitations, which cannot truly restore the actual denitration reaction process and cannot meet the multi-working condition testing requirements. CONTENT OF THE UTILITY MODEL

[0004] In order to more truly and accurately restore the actual reaction process on site and meet the multi-working condition testing requirements, the present application provides a multi-scene applicable SCR denitration catalyst performance testing system, which can be applied to various scenes, has high-precision detection capability, and is simple to operate.

[0005] Specifically, a multi-scene applicable SCR denitration catalyst performance testing system comprises:

[0006] A flue gas unit comprising a nitrogen supply device and a flue gas access device;

[0007] An ammonia gas generating unit for providing ammonia gas;

[0008] A dust adding unit for adding dust and controlling the dust input amount to simulate the dust arrangement mode of the SCR;

[0009] A mixing and heating unit connected with the flue gas unit, the ammonia gas generating unit, and the dust adding unit respectively;

[0010] A reaction unit connected with the mixing and heating unit, comprising a reaction chamber and a catalyst fixing device, and the catalyst fixing device is fixed with a catalyst; and

[0011] A detection unit connected with the inlet and outlet of the reaction unit, and the detection unit is used for sampling and detecting the inlet and outlet of the reaction chamber.

[0012] As a preferred scheme, it further comprises:

[0013] A steam generating unit connected with the reaction unit, used for providing steam to adjust the humidity of the flue gas to meet the testing requirements of different scenes; the steam generating unit comprises:

[0014] a steam generator;

[0015] a flow control valve arranged at an outlet end of the steam generator;

[0016] a flow meter arranged at an outlet end of the flow control valve; and

[0017] a humidity meter arranged at an outlet end of the flow meter, and an outlet end of the humidity meter is connected with the mixing heating unit.

[0018] As a preferred solution, it further comprises:

[0019] a tail gas treatment unit connected with the reaction unit for treating exhaust gas discharged by the reaction unit; the tail gas treatment unit comprises:

[0020] a tail gas treatment device connected with an outlet end of the reaction chamber; and

[0021] a fan connected with the other end of the tail gas treatment device.

[0022] As a preferred solution, it further comprises:

[0023] a backup gas source connected with the reaction unit for providing backup ammonia gas; the backup gas source comprises an ammonia gas storage tank, a gas flow control valve, a flow meter and a three-way valve; the gas flow control valve, the flow meter and the three-way valve are arranged in sequence at an outlet end of the ammonia gas storage tank; wherein the three-way valve is connected with the ammonia gas generation unit, and an outlet end of the three-way valve is connected with the mixing heating unit.

[0024] As a preferred solution, the flue gas access device comprises a flue gas access port and a flue gas flow meter; the nitrogen gas supply device comprises a gas storage tank, a gas flow control valve and a flow meter;

[0025] one end of the flue gas access port is in communication with flue gas, and the other end is in communication with the mixing heating unit through the flue gas flow meter; one end of the gas flow control valve is in communication with the gas storage tank, and the other end is in communication with the flow meter; the flow meter is in communication with the mixing heating unit.

[0026] As a preferred solution, the ammonia gas generation unit comprises an ammonia water storage device, a vaporizer, an ammonia water flow control valve, a flow meter, an ammonia gas flow control valve and an ammonia gas flow meter;

[0027] an outlet end of the ammonia water storage device is provided with the ammonia water flow control valve and the flow meter in sequence; an outlet end of the flow meter is connected with the vaporizer; an outlet end of the vaporizer is provided with the ammonia gas flow control valve and the ammonia gas flow meter in sequence; the ammonia gas flow meter is in communication with the mixing heating unit.

[0028] As a preferred scheme, the dust adding unit comprises a dust adding device, a vacuum regulating valve, a dust injection port and a dust concentration meter;

[0029] The bottom of the dust adding device is connected with the vacuum regulating valve; the outlet end of the vacuum regulating valve is connected with the dust injection port; the outlet end of the dust injection port is connected with the dust concentration meter; and the dust concentration meter is communicated with the mixing and heating unit.

[0030] As a preferred scheme, the mixing and heating unit comprises a gas mixer, a heater and a flow rate meter;

[0031] The inlet end of the gas mixer is connected with the outlet end of the flue gas unit, the ammonia gas generating unit and the dust adding unit respectively; the heater is internally provided with a plurality of groups of heating wires, each group of heating wires is provided with a temperature controller; the flow rate meter is arranged at the outlet end of the heater, and the outlet end of the flow rate meter is connected with the reaction unit.

[0032] As a preferred scheme, the reaction unit further comprises a reaction heat preservation device;

[0033] The inlet end of the reaction chamber is communicated with the outlet end of the mixing and heating unit; the reaction heat preservation device is arranged outside the reaction chamber to maintain the required temperature for reaction; and the reaction chamber is internally provided with the catalyst fixing device.

[0034] As a preferred scheme, the detection unit comprises a gas analyzer, an inlet sampling valve, an outlet sampling valve and a switching valve;

[0035] The inlet sampling valve is arranged at the inlet of the reaction chamber, and the outlet sampling valve is arranged at the outlet of the reaction chamber; the inlet sampling valve and the outlet sampling valve are connected with the switching valve respectively; and the switching valve is connected with the gas analyzer.

[0036] Compared with the prior art, the application has the following beneficial effects:

[0037] The application can accurately determine whether the catalyst is poisoned or not, reasonably assess the remaining life of the catalyst, timely detect the health status of the catalyst, reasonably formulate a maintenance plan and ensure the stability of production.

[0038] The application has unique value in determining key working condition parameters of the catalyst: the optimal values of parameters such as temperature, flow rate, urea or ammonia water replenishment rate, ammonia nitrogen ratio and the like can be accurately obtained, these working condition parameters directly affect the catalytic efficiency of the catalyst, and the optimal working condition parameters determined by the scheme can ensure that the catalyst can exert maximum efficiency under ideal conditions, thereby significantly improving the economic benefits of the entire production process.

[0039] The best production efficiency can be accurately mastered, the production parameters can be accurately adjusted by deeply analyzing the catalyst performance and determining the optimal working condition, the whole production process can be operated in an efficient state, and then remarkable effects can be achieved in aspects of yield improvement, cost reduction and product quality improvement. Meanwhile, the used catalysts can be effectively re-evaluated.

[0040] The residual activity of the used catalysts is determined through experiments, which helps to deeply explore the performance evolution law of the catalysts in the actual use process. According to the residual activity, the production party can make scientific decisions on whether to continue to use, adjust the use condition or replace, so as to realize efficient management and full use of the used catalyst resources.

[0041] The application can also realize real-time and accurate synchronous monitoring of multiple sampling points by one gas analyzer, and the monitoring is convenient and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0043] The structures, proportions, sizes and the like shown in the drawings of the specification are only used to cooperate with the disclosed content of the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes that can be achieved by the present application, should still fall within the scope of the disclosed technical content.

[0044] Figure 1 The structure schematic diagram of the first embodiment of the present application is shown in the figure;

[0045] Figure 2 The structure schematic diagram of the second embodiment of the present application is shown in the figure;

[0046] Figure 3 The structure schematic diagram of the third embodiment of the present application is shown in the figure;

[0047] Figure 4 The structure schematic diagram of the fourth embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0048] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0049] In the description of the present application, it should be understood that the terms such as indicated orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices, elements, modules, systems, platforms or devices referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The following description of the present application is only understood as a description of individual embodiments of the technical scheme of the present application, and other embodiments are not embodied in the following description, but it does not mean that the present application excludes these other embodiments, and the technical scheme of the present application is not limited to the specific implementation described below, and the protection scope of the present application is not limited to only the specific implementation described below. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should be within the scope of protection of the present application.

[0050] It should be noted that if the terms "first", "second" and the like appear in the description, claims and above-mentioned drawings of the present application, the description is only used to distinguish similar objects, and does not have to be used to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a system, product or device including a series of units or modules or components or components does not have to be limited to those units or modules or components clearly listed, but can include other components not clearly listed or inherent to these systems, products or devices.

[0051] The technical scheme of the present application will be further illustrated below by specific embodiments in combination with the drawings.

[0052] In some embodiments, as shown in Figure 1 The present application provides a multi-scene applicable SCR denitration catalyst performance test system, which comprises a flue gas unit 1, an ammonia gas generating unit 2, a dust adding unit 3, a steam generating unit 4, a mixing and heating unit 5, a reaction unit 6, a detection unit 7, a tail gas treatment unit 8 and a control unit 9.

[0053] The flue gas unit 1 comprises a nitrogen supply device and a flue gas access device, wherein the flue gas access device comprises a flue gas access port 1.1 and a flue gas flow meter 1.5, and the nitrogen supply device comprises a gas storage tank 1.2, a gas flow control valve 1.3 and a flow meter 1.4.

[0054] The flue gas inlet 1.1 is in communication with flue gas at one end and is in communication with the mixed heating unit through the flue gas flow meter 1.5 at the other end. The gas storage tank 1.2 stores nitrogen, which can be used to accurately control the pressure and flow required by the detection system, and can also be used for safety protection. Nitrogen is used as a purge gas to remove residual gas in the pipeline or equipment to prevent the accumulation of hazardous gases. The gas flow control valve 1.3 is in communication with the gas storage tank 1.2 at one end and is in communication with the flow meter 1.4 at the other end. The flow meter 1.4 is in communication with the mixed heating unit through the pipeline. The flow meter 1.4 is electrically connected to the control unit, which adjusts the nitrogen flow by controlling the opening size of the gas flow control valve 1.3 to meet the different needs of the system test.

[0055] The ammonia gas generating unit 2 includes an ammonia water storage device 2.1, a vaporizer 2.2, an ammonia water flow control valve 2.3, a flow meter 2.4, an ammonia gas flow control valve 2.5, and an ammonia gas flow meter 2.6.

[0056] The outlet end of the ammonia water storage device 2.1 is sequentially provided with the ammonia water flow control valve 2.3 and the flow meter 2.4. The amount of ammonia water is adjusted by controlling the ammonia water flow control valve 2.3. The ammonia water flows through the coil in the vaporizer 2.2 and is heated by water bath to vaporize into ammonia gas. The ammonia gas sequentially passes through the ammonia gas flow control valve 2.5, the ammonia gas flow meter 2.6, and the mixed heating unit.

[0057] The dust adding unit 3 includes a dust adding device 3.1, a vacuum regulating valve 3.2, a dust injection port 3.3, and a dust concentration meter 3.4.

[0058] The bottom of the dust adding device 3.1 is connected to the vacuum regulating valve 3.2. The other end of the vacuum regulating valve 3.2 is connected to the dust injection port 3.3. The other end of the dust injection port 3.3 is connected to the dust concentration meter 3.4. By reasonably controlling the amount of dust added, the high-dust arrangement, low-dust arrangement, and tail arrangement of SCR can be simulated.

[0059] The steam generating unit 4 includes a steam generator 4.1, a flow control valve 4.2, a flow meter 4.3, and a humidity meter 4.4.

[0060] The flow control valve 4.2 is arranged at the outlet end of the steam generator 4.1. The other end of the flow control valve 4.2 is sequentially provided with the flow meter 4.3 and the humidity meter 4.4. The outlet of the humidity meter 4.4 is in communication with the mixed heating unit. The humidity meter 4.4 monitors the humidity of the flue gas in real time and transmits signals to the control unit, which automatically adjusts the amount of steam generated according to the set value, thereby ensuring that the humidity of the flue gas meets the test requirements of different scenarios.

[0061] The mixed heating unit 5 includes a gas mixer 5.1, a heater 5.2, and a flow rate meter 5.3.

[0062] The inlet end of the gas mixer 5.1 is connected to the outlet end of each gas supply pipe. The heater 5.2 is internally provided with multiple groups of heating wires, each group of heating wires having an independent temperature controller, so as to accurately control the temperature of the heater 5.2. The flow rate meter 5.3 is arranged at the outlet end of the heater, and is used to accurately measure the gas flow rate.

[0063] The reaction unit 6 includes a reaction heat preservation device 6.1, a reaction chamber 6.2, and a catalyst fixing device 6.3.

[0064] The inlet end of the reaction chamber 6.2 is connected to the outlet end of the mixing and heating unit 5. The reaction heat preservation device 6.1 is arranged outside the reaction chamber 6.2, and is used to maintain the required temperature for the reaction, so as to ensure the stability of the test temperature. The catalyst fixing device 6.3 is arranged in the reaction chamber 6.2, and is used to fix the catalyst in the reaction chamber 6.2. The fixing device 6.3 can be a clamping groove, a clamp or the like, and the size of the fixing device 6.3 can be adjusted to adapt to catalysts of different sizes.

[0065] The detection unit 7 includes a gas analyzer 7.1, an inlet sampling valve 7.2, an outlet sampling valve 7.3, and a switching valve 7.4.

[0066] The inlet sampling valve 7.2 is arranged at the inlet of the reaction chamber 6.2, and the outlet sampling valve 7.3 is arranged at the outlet of the reaction chamber 6.2. The inlet sampling valve 7.2 and the outlet sampling valve 7.3 are connected to the switching valve 7.4, and the switching valve 7.4 is connected to the gas analyzer 7.1. The switching valve 7.4 is used to realize simultaneous detection of two sampling points by one gas analyzer. During the operation of the test system, the detection unit 7 sets the switching valve action time according to the length of the sampling pipe and the gas flow rate. The inlet sampling valve 7.2 and the outlet sampling valve 7.3 are switched at a fixed time, so as to realize synchronous and real-time accurate monitoring.

[0067] The tail gas treatment unit 8 includes a fan 8.1 and a tail gas treatment device 8.2.

[0068] One end of the tail gas treatment device 8.2 is connected to the outlet end of the reaction chamber 6.2, and the other end is connected to the fan 8.1. The tail gas treatment device 8.2 is an alkaline solution absorption tank connected in series with an activated carbon adsorber, and is used to absorb the exhaust gas discharged in the detection system, so as to ensure that the exhaust gas meets the environmental protection standards.

[0069] The control unit 9 includes a controller, a sensor, and an actuator. The sensor is responsible for collecting various types of information and converting them into electrical signals to be transmitted to the controller. After receiving the electrical signals transmitted by the sensor, the controller processes and analyzes them according to the pre-set control program, and then sends control signals to the actuator. Each flow control valve, heating device, gas analyzer, thermometer, flowmeter, hygrometer, steam generator, flow rate meter, and dust concentration meter is electrically connected to the controller, and under the unified coordination of the controller, they jointly realize the control of the system.

[0070] In operation, the catalyst to be tested is placed in the reaction chamber 6.2 and fixed by the catalyst fixing device 6.3. The heating device is started to heat the catalyst to the test setting value. Then the flue gas from the flue gas inlet 1.1, the dust from the dust feeding unit 3 and the ammonia gas from the ammonia gas generating unit 2 are introduced into the gas mixer 5.1. At the same time, steam generated by the steam generating unit 4 is introduced into the gas mixer 5.1 according to the test humidity requirement. The flue gas parameters such as flue gas amount, ammonia gas amount and dust concentration are adjusted by the flow control valve to meet the test conditions. After the parameters are monitored and stabilized, the uniformly mixed gas from the gas mixer 5.1 is heated to the test setting temperature (50-500℃) by the heater 5.2. The parameters are monitored to see if they meet the requirements. When the requirements are met and stabilized, the detection unit 7 is started to sample and test the inlet and outlet of the reaction chamber 6.2. The test data of the inlet and outlet sampling points (dust, SO2, SO3, NO, NO2, NH3, O2, etc.) on the gas analyzer are read to obtain the denitration efficiency, activity, ammonia escape rate, SO2 / SO3 conversion rate and other parameters of the catalyst. Thus, the test system for the performance of the SCR denitration catalyst suitable for multiple scenes can conveniently detect the results, has strong applicability and can simultaneously measure multiple parameters to comprehensively evaluate the performance of the catalyst.

[0071] In some embodiments, as shown in FIG. 2, different from the first embodiment, the ammonia gas storage tank 2.8, the gas flow control valve 2.9, the flow meter 2.10 and the three-way valve 2.7 are used as a backup gas source of the ammonia gas generating unit. The gas flow control valve 2.9 and the flow meter 2.10 are sequentially arranged at the outlet end of the ammonia gas storage tank 2.8. The three-way valve 2.7 is connected with the original ammonia gas supply pipeline at the other end and connected with the mixing and heating unit at the outlet end. The stable supply of ammonia gas is ensured and the stability of the test system is increased. Figure 2 In some embodiments, as shown in FIG. 3, different from the second embodiment, the Roots blower 3.5 is used as a dust conveying power source. The flow control valve 3.6 is arranged at the outlet end of the Roots blower 3.5 to control the gas flow in the pipeline. The pipeline outlet end is connected with the dust inlet 3.3. At the same time, when the test system uses simulated flue gas, the Roots blower 3.5 can also provide the required oxygen and nitrogen components of the system flue gas.

[0072] Figure 3 In some embodiments, as shown in FIG. 4, different from the third embodiment, the Roots blower 3.5 is used as a dust conveying power source. The flow control valve 3.6 is arranged at the outlet end of the Roots blower 3.5 to control the gas flow in the pipeline. The pipeline outlet end is connected with the dust inlet 3.3. At the same time, when the test system uses simulated flue gas, the Roots blower 3.5 can also provide the required oxygen and nitrogen components of the system flue gas.

[0073] In some embodiments, as shown in FIG. 5, different from the fourth embodiment, the Roots blower 3.5 is used as a dust conveying power source. The flow control valve 3.6 is arranged at the outlet end of the Roots blower 3.5 to control the gas flow in the pipeline. The pipeline outlet end is connected with the dust inlet 3.3. At the same time, when the test system uses simulated flue gas, the Roots blower 3.5 can also provide the required oxygen and nitrogen components of the system flue gas. Figure 4 ​As shown, unlike the third embodiment, the flue gas inlet 1.1 can be connected to the flue gas in the production site to carry out on-site actual testing, and thus can accurately reflect the influence of various characteristics such as the composition, temperature, humidity, and pressure of the flue gas in the actual production process on the performance of the catalyst. The flue gas inlet 1.1 can also be connected to simulated flue gas (for example, by combining different gas bottle groups), and by precisely controlling the parameters such as the composition, concentration, temperature, and humidity of the simulated flue gas, the influence of one or several parameters on the performance of the catalyst can be studied.

[0074] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as falling within the scope of the present disclosure.

[0075] The above embodiments only express several implementation manners of the present application, and are only used to illustrate the technical solutions of the present application, but not to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. Those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application.

Claims

1. A system for testing the performance of a multi-scenario applicable SCR denitration catalyst, characterized in that, The system comprises: a flue gas unit comprising a nitrogen gas supply device and a flue gas access device; an ammonia gas generation unit for providing ammonia gas; a dust feeding unit for feeding dust and controlling the amount of dust fed to simulate the dust arrangement of SCR; a mixing and heating unit connected with the flue gas unit, the ammonia gas generation unit and the dust feeding unit respectively; a reaction unit connected with the mixing and heating unit, comprising a reaction chamber and a catalyst fixing device, and the catalyst fixing device is fixed with a catalyst; and a detection unit connected with the inlet and outlet of the reaction unit respectively, and the detection unit is used for sampling and detecting the inlet and outlet of the reaction chamber. Further comprising:

2. The multi-scene applicable SCR denitration catalyst performance test system according to claim 1, characterized in that, a steam generation unit connected with the reaction unit, for providing steam to adjust the humidity of the flue gas to meet the test requirements of different scenes; the steam generation unit comprises: a steam generator; a flow control valve arranged at the outlet end of the steam generator; a flow meter arranged at the outlet end of the flow control valve; and a humidity meter arranged at the outlet end of the flow meter, and the outlet end of the humidity meter is connected with the mixing and heating unit. Further comprising:

3. The multi-scene applicable SCR denitration catalyst performance test system according to claim 1, characterized in that, an exhaust gas treatment unit connected with the reaction unit, for treating the exhaust gas discharged by the reaction unit; the exhaust gas treatment unit comprises: an exhaust gas treatment device connected with the outlet end of the reaction chamber at one end; and a fan connected with the other end of the exhaust gas treatment device. Further comprising: a backup gas source connected with the reaction unit, for providing backup ammonia gas; the backup gas source comprises an ammonia gas storage tank, a gas flow control valve, a flow meter and a three-way valve; the gas flow control valve, the flow meter and the three-way valve are arranged at the outlet end of the ammonia gas storage tank in sequence; wherein the three-way valve is connected with the ammonia gas generation unit, and the outlet end of the three-way valve is connected with the mixing and heating unit.

4. The multi-scenario applicable SCR denitration catalyst performance test system according to claim 1, characterized in that, 5. The system for testing the performance of SCR denitration catalyst suitable for multiple scenes according to claim 1, wherein: the flue gas access device comprises a flue gas access port and a flue gas flow meter; the nitrogen gas supply device comprises a gas storage tank, a gas flow control valve and a flow meter; one end of the flue gas access port is connected with the flue gas, and the other end is connected with the mixing and heating unit through the flue gas flow meter; one end of the gas flow control valve is connected with the gas storage tank, and the other end is connected with the flow meter; the flow meter is connected with the mixing and heating unit.

6. The system for testing the performance of SCR denitration catalyst suitable for multiple scenes according to claim 1, wherein: the ammonia gas generation unit comprises an ammonia water storage device, a vaporizer, an ammonia water flow control valve, a flow meter, an ammonia gas flow control valve and an ammonia gas flow meter; the outlet end of the ammonia water storage device is sequentially provided with the ammonia water flow control valve and the flow meter; the outlet end of the flow meter is connected with the vaporizer; the outlet end of the vaporizer is sequentially provided with the ammonia gas flow control valve and the ammonia gas flow meter; the ammonia gas flow meter is connected with the mixing and heating unit.

7. The system for testing the performance of SCR denitration catalyst suitable for multiple scenes according to claim 1, wherein: ​ ​ The dust adding unit comprises a dust adding device, a vacuum regulating valve, a dust injection port and a dust concentration meter. The bottom of the dust adding device is connected with the vacuum regulating valve; the outlet end of the vacuum regulating valve is connected with the dust injection port; the outlet end of the dust injection port is connected with the dust concentration meter; the dust concentration meter is communicated with the mixing and heating unit.

8. The system for testing the performance of the SCR denitration catalyst applicable to multiple scenes according to claim 1, characterized in that: The mixing and heating unit comprises a gas mixer, a heater and a flow rate meter. The inlet end of the gas mixer is connected with the outlet end of the flue gas unit, the ammonia gas generating unit and the dust adding unit respectively; the heater is internally provided with multiple groups of heating wires, each group of heating wires is provided with a temperature controller; the flow rate meter is arranged at the outlet end of the heater, and the outlet end of the flow rate meter is connected with the reaction unit.

9. The system for testing the performance of the SCR denitration catalyst applicable to multiple scenes according to claim 1, characterized in that: The reaction unit further comprises a reaction heat preservation device. The inlet end of the reaction chamber is communicated with the outlet end of the mixing and heating unit; the reaction heat preservation device is arranged outside the reaction chamber to maintain the required temperature for reaction; and the catalyst fixing device is arranged in the reaction chamber.

10. The system for testing the performance of the SCR denitration catalyst applicable to multiple scenes according to claim 1, characterized in that: The detection unit comprises a gas analyzer, an inlet sampling valve, an outlet sampling valve and a switching valve. The inlet sampling valve is arranged at the inlet of the reaction chamber, and the outlet sampling valve is arranged at the outlet of the reaction chamber; the inlet sampling valve and the outlet sampling valve are connected with the switching valve respectively; The switching valve is connected with the gas analyzer.

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