Experimental device for characterizing the performance of catalytic filter materials for simulating the decomposition of dioxins combined with SCR denitrification

Abstract

The present invention relates to a catalytic filter material performance characterization experimental device for simulating the decomposition of dioxins and SCR denitrification, comprising a multi-component automatic gas distribution unit, a high-precision temperature control unit, a fast-sampling catalytic reaction unit, a smoke detection unit and an exhaust gas treatment unit, wherein the multi-component automatic gas distribution unit is connected to the high-precision temperature control unit to configure and heat the required mixed gas, the high-precision temperature control unit is connected to the fast-sampling catalytic reaction unit to catalytically react the catalytic filter material in the fast-sampling catalytic reaction unit, the fast-sampling catalytic reaction unit is connected to the smoke detection unit to detect the smoke after the reaction, and the smoke detection unit is connected to the exhaust gas treatment unit to treat the exhaust gas after the detection. The device is safe and convenient to use, the test conditions are flexible to adjust multiple factors, and the test accuracy is high.

Description

Technical Field

[0001] The invention belongs to the technical field of dioxin decomposition combined with SCR denitration, and in particular relates to a catalytic filter material performance characterization experimental device for simulating dioxin decomposition combined with SCR denitration. Background Art

[0002] Air pollution pollutants come from flue gas emissions from industries such as steel enterprises and thermal power plants. The main pollutants in flue gas emissions include sulfur dioxide, nitrogen oxides, highly toxic substances contained in fly ash such as dioxins, and trace heavy metals such as Cr and Hg. In order to effectively control the emission of air pollutants, relevant departments in my country have successively formulated a number of relevant laws, policies and standards to control the emission of pollutants. After years of continuous research and exploration, a series of new flue gas denitrification and dioxin removal technologies have been developed, such as high-temperature, medium-temperature and low-temperature SCR denitrification technology, SNCR denitrification technology, catalytic degradation of dioxin technology, etc. At present, bag dust removal is the most efficient dust removal method for industrial smoke filtration. With the further development of high-temperature resistant filter materials and pulse cleaning technologies, bag dust collectors have been increasingly widely used in the field of high-temperature and high-concentration flue gas treatment due to their excellent dust removal performance. With the technological advancement of denitrification catalysts, many studies have shown that many NH 3 -SCR denitrification catalyst can also be used to catalyze the decomposition of dioxins, which can completely degrade dioxins into H 2 O、CO 2 , HCl and other inorganic small molecules, load the SCR denitration catalyst onto the dust removal filter material, and integrate the SCR denitration and dioxin removal technology into the bag filter, forming an integrated SCR denitration and dioxin removal technology, which can solve the technical problems of high investment cost of denitration equipment, catalyst easy to be blocked by dust, wear and even poisoning failure, and NH3 escape, and realize the short process and low cost operation of dust and dioxin integrated removal. The development of denitration catalytic filter material technology for bag dust removal with better denitration and dioxin removal performance has become a hot topic in this field, so the efficiency performance test and evaluation instrument of denitration and dioxin removal catalytic filter material has also become an important experimental equipment for research in this field.

[0003] Patent CN201910215838.5 discloses a test device and evaluation method based on the denitration effect of catalyst-loaded filter material. It simulates flue gas passing through a denitration device with catalyst-loaded filter material, and can detect the denitration effect of the catalyst-loaded filter material on flue gas containing nitrogen oxides. However, the test device uses manual sampling, with a low degree of automation, and the gas distribution is directly introduced into the mixture, resulting in uneven mixing. In addition, the monitoring of flue gas values ​​is determined by two separate flue gas sensors, resulting in a large error in the front and back measurements.

[0004] Patent CN201920317140.X discloses a denitration catalyst performance test device, which controls the main components of simulated flue gas, simulates the flue gas entering a reactor equipped with a catalyst to be tested to complete the denitration reaction process, and uses a flue gas analyzer to detect the change in flue gas NO concentration before and after the reactor, thereby obtaining the activity of the catalyst. However, the test device is for evaluating the denitration effect of an independent catalyst, and the above device cannot be used to evaluate the denitration effect of a high-temperature resistant filter material loaded with a denitration catalyst.

[0005] At the same time, in the process of research and development of denitrification and dioxin removal catalytic filter materials, in addition to the performance characterization of its catalyst loading effect, catalyst loading crystal type and its catalytic filter material thermal decomposition performance, the test of the denitrification and dioxin removal performance of the catalytic filter material and the exploration of the factors affecting the denitrification and dioxin removal performance under different experimental working conditions are also important factors in evaluating the overall performance of the catalytic filter material. There are many types of experimental tests for denitrification and dioxin removal catalytic filter materials, such as catalytic filter material denitrification performance test, catalytic filter material sulfur resistance test, catalytic filter material dioxin removal performance test, temperature and filtration wind speed on catalytic filter material denitrification and dioxin removal performance test, gas distribution ratio and moisture content on catalytic filter material denitrification and dioxin removal performance test, etc. In order to complete these performance tests, the existing technology needs to be equipped with many sets of corresponding experimental test systems, but because different test system designs are only used to complete corresponding types of experimental tests, the functions are relatively single, which leads to large construction investment for the laboratory to equip all experimental test systems, large floor space, and low utilization rate of instruments and equipment. In addition, traditional catalytic filter material denitrification and dioxin removal performance tests are limited by low equipment automation (such as manual sample loading), single test conditions (such as only being able to adjust the temperature and a small range of adjusting the filtration wind speed), low analytical detection accuracy, and large experimental errors (the reaction flue gas temperature and the filter material surface temperature are not uniform). It is impossible to accurately evaluate the comprehensive denitrification performance of the catalytic filter material. In addition, cross-flow, uneven gas distribution, and low equipment utilization are prone to occur between the gas pipelines in the test system. Therefore, it is impossible to accurately obtain the comprehensive performance evaluation data of the denitrification catalytic filter material, which also causes troubles in judging the effectiveness of the subsequent catalytic filter material in actual working conditions, and may cause serious application risks. Summary of the invention

[0006] The purpose of the present invention is to provide a catalytic filter material performance characterization experimental device for simulating the decomposition of dioxins combined with SCR denitrification. The device is safe and convenient to use, the test conditions can be flexibly adjusted by multiple factors, and the test accuracy is high.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an experimental device for characterizing the performance of catalytic filter materials for simulating the decomposition of dioxins combined with SCR denitrification, comprising a multi-component automatic gas distribution unit, a high-precision temperature control unit, a rapid sampling catalytic reaction unit, a flue gas detection unit and an exhaust gas treatment unit, wherein the multi-component automatic gas distribution unit is connected to the high-precision temperature control unit to configure and heat the required mixed gas, the high-precision temperature control unit is connected to the rapid sampling catalytic reaction unit to catalyze the catalytic filter material in the rapid sampling catalytic reaction unit, the rapid sampling catalytic reaction unit is connected to the flue gas detection unit to detect the flue gas after the reaction, and the flue gas detection unit is connected to the exhaust gas treatment unit to treat the exhaust gas after the detection.

[0008] Furthermore, the multi-component automated gas distribution unit includes a multi-way gas supply system, a gas mixing tank, a precision injection pump for stabilizing the atomized solution, a precision vaporization chamber and an integrated control device. The multi-way gas supply system is equipped with a plurality of standard gas cylinders, each of which is connected to the gas mixing tank via a gas supply pipeline. A pressure reducing valve, a filter, an electromagnetic stop valve, a mass flow controller and a one-way valve are sequentially arranged on the gas supply pipeline. The gas output from the standard gas cylinder is reduced in pressure by the pressure reducing valve and filtered and dusted by the filter, and then the flow is measured and adjusted by the mass flow controller and then input into the gas mixing tank. The electromagnetic stop valve is used to open or close the corresponding gas supply pipeline, and the one-way valve is used to prevent gas backflow; the outlets of the gas mixing tank and the precision injection pump are respectively connected to the inlet of the precision vaporization chamber, and the outlet of the precision vaporization chamber is connected to a high-precision temperature control unit; each unit is connected by a high-temperature and corrosion-resistant pipeline.

[0009] Furthermore, the multi-way gas supply system is a five-way gas supply system, which is equipped with five standard gas cylinders, each containing N 2 , O 2 , NO, NH 3 、SO 2 Gas; N 2 , O 2 , NO, NH 3 、SO 2 The flow adjustment range of the mass flow controller on the gas supply pipeline is 0~5000 mL / min, 0~500 mL / min, 0~500 mL / min, 0~500 mL / min, 0~500 mL / min, and 0~500 mL / min, respectively, and the flow control error is ≤1mL / min; the precision injection pump is filled with dioxin stock solution, and the flow range of the precision injection pump is 10~1000 µl / min, and the accuracy is ±0.5%; the inner diameter of the high-temperature and corrosion-resistant pipeline is 3~6mm, and a detachable insulation sleeve is provided on the outside of the connecting pipeline outside the equipment between the outlet of the precision vaporization chamber, the high-precision temperature control unit and the smoke detection unit.

[0010] Furthermore, the mixing tank is a 0.3 L cylindrical stainless steel tank body, on which five air inlets connected to five air supply pipelines are equidistantly arranged, and the mixing tank is provided with equidistant and evenly divided porous plates to enable the gas entering the mixing tank to be quickly mixed and evenly mixed.

[0011] Furthermore, the high-precision temperature control unit is mainly composed of two independent temperature control units, namely a gas preheater and a gas reactor; the gas preheater is mainly composed of a spiral coil and a tubular heating furnace arranged on its outer side, and the spiral coil is connected to the output pipeline of the precision vaporization chamber; the controllable temperature of the tubular heating furnace is 25-450°C, and the temperature control accuracy is ±1°C; the gas reactor includes a reaction heating furnace and a furnace tube, the rear end of the furnace tube is connected to the spiral coil, and the front end extends into the rapid sampling catalytic reaction unit, and the reaction heating furnace is located on the outside of the furnace tube and the rapid sampling catalytic reaction unit; temperature sensors are respectively provided at the front and rear ends of the catalytic filter material.

[0012] Furthermore, the rapid sample lofting catalytic reaction unit is mainly composed of a replaceable variable-section pressure ring and an electric lifting motor. The replaceable variable-section pressure ring is composed of two replaceable upper and lower toothed circular ring washers. The inner ring diameter of the toothed circular ring washers is 3~6 cm, the outer ring diameter is 7~8 cm, and the thickness is 2~4 mm. It is made of an inorganic material resistant to high temperatures above 500°C. The longitudinal section of the toothed circular ring washers is tooth-shaped. The filter material to be tested is placed between the upper and lower pressure rings. The electric lifting motor drives the toothed circular ring washers of the upper and lower pressure rings to open or close the filter material, so as to achieve rapid sample change at high temperature and relax the experimental gas flow rate; the torque of the electric lifting motor is greater than 100 kg / m 2 .

[0013] Furthermore, the smoke detection unit includes a denitrification smoke analysis module, a dioxin collection or analysis module and a water vapor collection or analysis module, wherein a dust removal filter and a silica gel particle dehydrator are arranged between the denitrification smoke analysis module and the fast sampling catalytic reaction unit, and the denitrification smoke analysis module contains O 2 , NO, NH 3 、SO 2 Analysis module; dioxin collection or analysis module, water vapor collection or analysis module are switched through a three-way valve so that the flue gas to be tested can directly reach the collection or analysis module.

[0014] Furthermore, the tail gas treatment unit is composed of a sodium hydroxide alkali solution denitrification tail gas treatment device and an activated carbon particle absorption de-dioxin treatment device.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention integrates several gas lines required for denitration or de-dioxin tests, and is no longer used exclusively for denitration or de-dioxin tests. The flow control of each pipeline of denitration flue gas is centralized in the automatic control system. The dioxin flue gas is vaporized and mixed with nitrogen and oxygen in the vaporization chamber and then flow controlled by the control valve. The automatic control system integrates the temperature display, temperature controller, flow display, flow controller, pressure display and other instruments in a fully automatic gas distribution cabinet, and is controlled by an integrated intelligent touch-sensitive data panel. The gas distribution type program is built-in, and the gas distribution can be started with one button to meet the needs of different experimental mixed gases. An anti-bumping device similar to a baffle is independently designed and installed in the gas mixing tank, which can greatly reduce the flow rate of each pipeline gas after entering the mixing tank, so that each pipeline gas has sufficient mixing contact time in the mixing tank, so that each pipeline gas is mixed more evenly, and the content ratio of each gas component in the mixed gas is closer to the content of each component in the industrial flue gas, and finally improves the rationality and authenticity of the experimental data results.

[0017] 2. The catalytic reaction table used in the catalytic reaction stage of the present invention has the functions of rapid sample change and adjustable filtration wind speed. The rapid sample change is to cut the filter material sample to be tested into a circular filter material with a diameter of 7 cm, and then put it into the sample placement table. By independently designing a speed regulating gasket, the middle opening area of ​​the gasket and the total gas volume of the automatic gas distribution unit are changed to realize the test of the denitrification efficiency under different filtration wind speeds, so that the filtration wind speed can be adjusted from 0.2 to 6.0 m / min. Toothed gaskets with different opening sizes are selected according to test needs, and then an electric lifting motor is used to make the upper and lower toothed gaskets bite each other. The test experiment can be started after the seal is pressed tightly without leakage, and this sample change step can be completed by opening the sample change platform through the electric lifting motor at high temperature. Compared with the traditional catalytic filter material denitrification and de-dioxin test system, the filter material sample to be tested must be cut into a fixed size and screw holes must be manually punched around the filter material, and then the filter material sample must be fixed up and down with multiple screws. When replacing the filter material sample to be tested, it is necessary to wait for the heating equipment to cool down completely before removing the fixing screws to change the sample. This breaks through the existing test platform's manual sample replacement, complicated sample replacement operation, low equipment automation, limitation to a single flow rate and a single filtration area, single test conditions and low efficiency. It allows continuous processing and testing of multiple groups of catalytic filter material samples, greatly improving sample testing efficiency and equipment utilization, and making the test process simpler and more convenient.

[0018] 3. Compared with the traditional test system that heats the flue gas and filter material at the same time, the gas heater and catalytic reaction table structure adopted in the present invention separates the preheating section of the catalytic reaction unit from the catalytic reaction section. The mixed simulated flue gas then enters the spiral tube of the heating furnace for preheating, and then enters the catalytic reaction table for gas reaction. This structural design can make the reaction gas temperature and the surface temperature of the catalytic filter material sample uniform, and can eliminate the problem of inconsistent temperature of the reaction gas and the catalytic filter material sample caused by the large difference in heat transfer coefficient between the tubular furnace wall and the gas. It conforms to the material heat transfer theory, improves the temperature control accuracy of the SCR reaction, and greatly reduces the experimental error of the catalytic reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a schematic diagram of the device structure of an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of a rapid sampling catalytic reaction unit in an embodiment of the present invention.

[0021] Figure 3 It is a schematic structural diagram of a replaceable variable-section pressure ring provided in an embodiment of the present invention.

[0022] Figure 4 It is a schematic longitudinal cross-sectional view of a replaceable variable-section pressure ring in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] like Figure 1As shown, the present embodiment provides a catalytic filter material performance characterization experimental device for simulating the decomposition of dioxins combined with SCR denitrification, comprising a multi-component automatic gas distribution unit 1, a high-precision temperature control unit 2, a rapid sampling catalytic reaction unit 3, a flue gas detection unit 4 and an exhaust gas treatment unit 5, wherein the multi-component automatic gas distribution unit is connected to the high-precision temperature control unit to configure and heat the required mixed gas, the high-precision temperature control unit is connected to the rapid sampling catalytic reaction unit to catalyze the catalytic filter material in the rapid sampling catalytic reaction unit, the rapid sampling catalytic reaction unit is connected to the flue gas detection unit to detect the flue gas after the reaction, and the flue gas detection unit is connected to the exhaust gas treatment unit to treat the exhaust gas after the detection.

[0027] Among them, the multi-component automatic gas distribution unit includes a multi-way gas supply system, a gas mixing tank, a precision injection pump for stabilizing the atomized solution, a precision vaporization chamber and an integrated control device. The multi-way gas supply system is equipped with a plurality of standard gas cylinders, each of which is connected to the gas mixing tank via a gas supply pipeline. A pressure reducing valve, a filter, an electromagnetic stop valve, a mass flow controller (MFC) and a one-way valve are sequentially arranged on the gas supply pipeline. The gas output from the standard gas cylinder is reduced in pressure by the pressure reducing valve and filtered and dusted by the filter, and then the flow is measured and adjusted by the mass flow controller and then input into the gas mixing tank. The electromagnetic stop valve is used to open or close the corresponding gas supply pipeline, and the one-way valve is used to prevent gas backflow; the outlets of the gas mixing tank and the precision injection pump are respectively connected to the inlet of the precision vaporization chamber, and the outlet of the precision vaporization chamber is connected to a high-precision temperature control unit; each unit is connected by a high-temperature and corrosion-resistant pipeline such as a stainless steel pipe and a polytetrafluoroethylene pipe.

[0028] like Figure 1 As shown, in this embodiment, the multi-way gas supply system is a five-way gas supply system, which is equipped with five standard gas cylinders, each containing N 2 , O 2 , NO, NH 3 、SO 2 Gas. In the figure, CV1-CV5 represent 5 pressure reducing valves + filters, SV1-SV5 represent 5 solenoid stop valves, MFC1-MFC5 represent 5 mass flow controllers, and NRV1-5 represent 5 one-way valves. 2 , O 2 , NO, NH 3 、SO 2The flow adjustment range of the mass flow controller on the gas supply pipeline is 0~5000 mL / min, 0~500 mL / min, 0~500 mL / min, 0~500 mL / min, 0~500 mL / min, and 0~500 mL / min, respectively, and the flow control error is ≤1mL / min; the precision injection pump is filled with dioxin stock solution, and the flow range of the precision injection pump is 10~1000 µl / min, and the accuracy is ±0.5%; the inner diameter of the high-temperature and corrosion-resistant pipeline is 3~6mm, and a detachable insulation sleeve is provided on the outside of the connecting pipeline outside the equipment between the outlet of the precision vaporization chamber, the high-precision temperature control unit and the smoke detection unit.

[0029] The mixing tank is a 0.3 L cylindrical stainless steel tank body, on which five air inlets connected to five air supply pipelines are equidistantly arranged. The mixing tank is provided with equidistant and evenly distributed porous plates to allow the gas entering the mixing tank to be quickly mixed and evenly mixed.

[0030] The controllable temperature of the precision vaporization chamber is from room temperature to 300℃; the integrated control device is equipped with a touch screen to select the working state and display the workflow. The PLC controls the operation of the electromagnetic stop valve, mass flow controller, and pressure transmitter. The built-in gas distribution type program can start the gas distribution with one button to meet the needs of different experimental mixed gases.

[0031] In this embodiment, the high-precision temperature control unit is mainly composed of two independent temperature control units, namely a gas preheater and a gas reactor; the gas preheater is mainly composed of a spiral coil and a tubular heating furnace arranged on its outer side, and the spiral coil is connected to the output pipeline of the precision vaporization chamber; the controllable temperature of the tubular heating furnace is 25-450°C, and the temperature control accuracy is ±1°C; the gas reactor includes a reaction heating furnace and a furnace tube, the rear end of the furnace tube is connected to the spiral coil, and the front end extends into the rapid sampling catalytic reaction unit, and the reaction heating furnace is located on the outside of the furnace tube and the rapid sampling catalytic reaction unit; temperature sensors are respectively provided at the front and rear ends of the catalytic filter material.

[0032] Through the two independent temperature control units of gas preheater and gas reactor, the deviation between the set temperature and the actual temperature can be less than 1°C. This structural design is different from the traditional test device in that the traditional metal heat transfer to the fabric carrier (gas reactor part) is changed to heat transfer to the fabric carrier through gas, thereby ensuring high-precision temperature control.

[0033] like Figure 2-4As shown, the rapid sample lofting catalytic reaction unit is mainly composed of a replaceable variable-section pressure ring and an electric lifting motor. The replaceable variable-section pressure ring is composed of two replaceable toothed circular ring washers, the inner ring diameter of the toothed circular ring washers is 3-6 cm, the outer ring diameter is 7-8 cm, the thickness is 2-4 mm, and it is made of an inorganic material resistant to high temperatures above 500°C. The longitudinal section of the toothed circular ring washers is tooth-shaped. The filter material to be tested is placed between the upper and lower pressure rings. The toothed circular ring washers of the upper and lower pressure rings are driven to open or close the filter material by the electric lifting motor to drive the lifting, so as to realize rapid sample change at high temperature and relax the experimental gas flow rate; the torque of the electric lifting motor is greater than 100 kg / m 2 .

[0034] In this embodiment, the flue gas detection unit includes a denitrification flue gas analysis module, a dioxin collection or analysis module and a water vapor collection or analysis module, wherein a dust removal filter and a silica gel particle dehydrator are arranged between the denitrification flue gas analysis module and the rapid sampling catalytic reaction unit, and the denitrification flue gas analysis module contains O 2 , NO, NH 3 、SO 2 Analysis module; dioxin collection or analysis module, water vapor collection or analysis module are switched through a three-way valve so that the flue gas to be tested can directly reach the collection or analysis module.

[0035] In this embodiment, the tail gas treatment unit is composed of a sodium hydroxide alkali solution denitrification tail gas treatment device and an activated carbon particle absorption de-dioxin treatment device.

[0036] The integrated control device is integrated into the automatic control system of the fully automatic mixing gas distribution cabinet. The flow display and flow controller are electrically connected to the pressure flow meter on the air intake pipeline; the temperature display and temperature controller are electrically connected to the temperature sensor provided on the reactor; and the computer is electrically connected to the flue gas analyzer.

[0037] In the examples, the reagents or instruments used without indicating the manufacturer are all conventional products that can be obtained commercially. 2 Gas purity is 99.99%, O 2 Gas purity is 99.9%, SO 2 , NO, NH 3 Standard gas (concentration 1%, 99% N 2 As the balance gas, a chlorobenzene solution was used as a simulation of a dioxin stock solution.

[0038] Example 1 Catalytic filter material denitrification performance test

[0039] (1) Set the filtration wind speed to 0.5 m / min, use a toothed gasket with an inner diameter of 5 cm, and place the catalytic filter material sample through the rapid sample placement catalytic reaction unit; set the target temperatures of the high-precision temperature control unit gas preheater and gas reactor to 210°C and 200°C; set the gas components in the simulated flue gas through the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2 925 mL / min, O 2 30 mL / min, NO 40 mL / min, SO 2 The mixed gas was passed into the flue gas analyzer through the mixing tank and the initial NO concentration was measured to be 390 ppm.

[0040] (2) The gas components in the simulated flue gas are set by the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2 885 mL / min, O 2 30 mL / min, NO 40 mL / min, SO 2 5 mL / min, NH 3 To ensure that the total gas flow rate is 1L / min, the reaction gas NH 3 When the balance gas N needs to be adjusted 2 The three-way valve is rotated to allow the mixed gas to pass through the gas mixing tank into the fast sampling catalytic reaction unit containing the catalytic filter material sample to be tested for denitration catalytic reaction; the NO concentration is detected by the flue gas detection unit to be 31ppm, and the denitration rate of the catalytic filter material sample is calculated to be 92%; the exhaust gas during the denitration reaction is purified, absorbed and discharged by the exhaust gas treatment unit.

[0041] (3) Close the mass flow controller and electromagnetic shut-off valve in the multi-component automatic gas distribution unit, place the catalytic filter material sample in the catalytic reaction unit through the rapid placement unit, place the new catalytic filter material sample to be tested, and repeat steps (1) to (3) to start the new sample test.

[0042] In Example 1, the device of the present invention was tested and compared with a conventional catalytic filter material denitration test device, and the comparison results are as follows:

[0043]

[0044] Note: The reaction gas stabilization time refers to the time required for the flue gas to be tested to stabilize from the beginning of its introduction to the test value at the front end of the flue gas analyzer; the difference between the actual reaction temperature and the preset temperature refers to the difference between the preset temperature of the gas reactor and the actual filter material reaction temperature; the sample replacement interval time refers to the time taken to replace the next group of samples after the previous group of samples are tested and to heat up to the preset reaction temperature.

[0045] Example 2 Test of dioxin removal performance of catalytic filter material

[0046] (1) Set the filtration wind speed to 0.8 m / min, use a toothed gasket with an inner diameter of 4 cm, and place the catalytic filter material sample through the rapid sample placement catalytic reaction unit; set the target temperatures of the high-precision temperature control unit gas preheater and gas reactor to 230°C and 215°C, and the temperature of the precision vaporization chamber to 200°C; set the gas components in the simulated flue gas through the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2 900mL / min, O 2 The flow rate of chlorobenzene solution in the precision injection pump was set to 100 µl / min. The mixed gas passed through the precision vaporization chamber and the smoke detection unit to measure the initial dioxin equivalent content in the mixed gas, which was 0.775 ng TEQ / Nm 3

[0047] (2) Rotate the three-way valve switch to allow the mixed gas to pass into the rapid sampling catalytic reaction unit containing the catalytic filter sample to be tested for dioxin removal reaction; the actual dioxin equivalent content in the exhaust gas after the catalytic reaction is measured by the flue gas detection unit to be 0.017 ng TEQ / Nm 3 After analysis, it was found that the dioxin removal rate of the catalytic filter material sample was 97.8%; the exhaust gas during the de-dioxin reaction was purified, absorbed and discharged through the exhaust gas treatment unit.

[0048] (3) Close the mass flow controller and electromagnetic shut-off valve in the multi-component automatic gas distribution unit, place the catalytic filter material sample in the catalytic reaction unit through the rapid placement unit, place the new catalytic filter material sample to be tested, and repeat steps (1) to (3) to start the new sample test.

[0049] In Example 2, the device of the present invention was tested and compared with a conventional catalytic filter material dioxin removal test device, and the comparison results are as follows:

[0050]

[0051] Example 3 Test of the performance of catalytic filter material denitrification and synergistic dioxin removal

[0052] (1) Set the filtration wind speed to 1.4 m / min, use a toothed gasket with an inner diameter of 3 cm, and place the catalytic filter material sample through the rapid sample placement catalytic reaction unit; set the target temperatures of the high-precision temperature control unit gas preheater and gas reactor to 245°C and 230°C, and the temperature of the precision vaporization chamber to 200°C; set the gas components in the simulated flue gas through the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2 925mL / min, O 230 mL / min, NO 40 mL / min, SO 2 The mixed gas was passed through the gas mixing tank into the flue gas analyzer to measure NO x The initial concentration was 395 ppm. The flow rate of chlorobenzene solution in the precision injection pump was set to 50 µl / min. The mixed gas passed through the precision vaporization chamber and the initial dioxin equivalent content in the mixed gas was measured by the flue gas analyzer to be 0.387 ng TEQ / Nm 3

[0053] (2) The gas components in the simulated flue gas are set by the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2 885 mL / min, O 2 30 mL / min, NO 40 mL / min, SO 2 5 mL / min, NH 3 The three-way valve switch is rotated to allow the mixed gas to pass through the gas mixing tank and the gasification mixing chamber and then enter the fast sampling catalytic reaction unit containing the catalytic filter material sample to be tested for denitrification catalytic reaction; the NO concentration is detected by the flue gas detection unit to be 42ppm, and the actual dioxin equivalent content in the exhaust gas after the catalytic reaction is determined to be 0.013ng TEQ / Nm 3 ; The calculation shows that the denitrification rate of the catalytic filter material sample is 89.36%, and the analysis shows that the dedioxinization rate of the catalytic filter material sample is 96.6%; the exhaust gas from the denitrification and dedioxinization reaction process is purified, absorbed and discharged through the exhaust gas treatment unit.

[0054] (3) Close the mass flow controller and electromagnetic shut-off valve in the multi-component automatic gas distribution unit, place the catalytic filter material sample in the catalytic reaction unit through the rapid placement unit, place the new catalytic filter material sample to be tested, and repeat steps (1) to (3) to start the new sample test.

[0055] The test results of the efficiency of the device of the present invention in Example 3 are as follows:

[0056]

[0057] Example 4 Catalytic filter material denitrification and water resistance performance test

[0058] (1) Set the filtration wind speed to 0.7 m / min, use a toothed gasket with an inner diameter of 4.3 cm, and place the catalytic filter material sample through the rapid sample placement catalytic reaction unit; set the target temperatures of the high-precision temperature control unit gas preheater and gas reactor to 210°C and 200°C, and the temperature of the precision vaporization chamber to 200°C; set the gas components in the simulated flue gas through the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2855mL / min, O 2 is 100 mL / min, NO is 40 mL / min, SO 2 The mixed gas was passed through the gas mixing tank into the flue gas analyzer to measure NO x The initial concentration was 387 ppm. The deionized water flow rate of the precision injection pump was set to 50 µl / min, and the initial water vapor content in the mixed gas was measured by the flue gas analyzer through the precision vaporization chamber to be 6.2%.

[0059] (2) The gas components in the simulated flue gas are set by the mass flow controller and electromagnetic stop valve in the multi-component automatic gas distribution unit: N 2 815 mL / min, O 2 100 mL / min, NO 40 mL / min, SO 2 5 mL / min, NH 3 The temperature of the mixed gas was 40 mL / min; the three-way valve was rotated to allow the mixed gas to pass through the gas mixing tank and the gasification mixing chamber and then enter the fast sampling catalytic reaction unit containing the catalytic filter material sample to be tested for denitrification catalytic reaction; the NO concentration was detected to be 82 ppm by the flue gas detection unit; the denitrification rate of the catalytic filter material sample was calculated to be 78.81%; the exhaust gas from the denitrification reaction process was purified, absorbed and discharged by the exhaust gas treatment unit.

[0060] (3) Close the mass flow controller and electromagnetic shut-off valve in the multi-component automatic gas distribution unit, place the catalytic filter material sample in the catalytic reaction unit through the rapid placement unit, place the new catalytic filter material sample to be tested, and repeat steps (1) to (3) to start the new sample test.

[0061] The test efficiency results of the device of the present invention in Example 4 are as follows:

[0062]

[0063] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A catalytic filter material performance characterization experimental device for simulating the decomposition of dioxins combined with SCR denitrification, characterized in that: It includes a multi-component automatic gas distribution unit, a high-precision temperature control unit, a fast-sampling catalytic reaction unit, a smoke detection unit and an exhaust gas treatment unit. The multi-component automatic gas distribution unit is connected to the high-precision temperature control unit to configure and heat the required mixed gas. The high-precision temperature control unit is connected to the fast-sampling catalytic reaction unit to catalytically react the catalytic filter material in the fast-sampling catalytic reaction unit. The fast-sampling catalytic reaction unit is connected to the smoke detection unit to detect the smoke after the reaction. The smoke detection unit is connected to the exhaust gas treatment unit to treat the exhaust after the detection. The multi-component automatic gas distribution unit includes a multi-way gas supply system, a gas mixing tank, a precision injection pump for stabilizing the atomized solution, a precision vaporization chamber and an integrated control device. The multi-way gas supply system is equipped with a plurality of standard gas cylinders, each of which is connected to the gas mixing tank via a gas supply pipeline. A pressure reducing valve, a filter, an electromagnetic stop valve, a mass flow controller and a one-way valve are sequentially arranged on the gas supply pipeline. The gas output from the standard gas cylinder is reduced in pressure by the pressure reducing valve and filtered and dusted by the filter, and then the flow is measured and adjusted by the mass flow controller and then input into the gas mixing tank. The electromagnetic stop valve is used to open or close the corresponding gas supply pipeline, and the one-way valve is used to prevent gas backflow; the outlets of the gas mixing tank and the precision injection pump are respectively connected to the inlet of the precision vaporization chamber, and the outlet of the precision vaporization chamber is connected to a high-precision temperature control unit; each unit is connected by a high-temperature and corrosion-resistant pipeline; The high-precision temperature control unit is mainly composed of two independent temperature control units, namely, a gas preheater and a gas reactor; the gas preheater is mainly composed of a spiral coil and a tubular heating furnace arranged on the outer side thereof, and the spiral coil is connected to the output pipeline of the precision vaporization chamber; the controllable temperature of the tubular heating furnace is 25-450°C, and the temperature control accuracy is ±1°C; the gas reactor includes a reaction heating furnace and a furnace tube, the rear end of the furnace tube is connected to the spiral coil, and the front end extends into the fast-sampling catalytic reaction unit, and the reaction heating furnace is located on the outside of the furnace tube and the fast-sampling catalytic reaction unit; the front end and the rear end of the catalytic filter are respectively provided with temperature sensors; The fast sample lofting catalytic reaction unit is mainly composed of a replaceable variable-section pressure ring and an electric lifting motor. The replaceable variable-section pressure ring is composed of two replaceable toothed circular ring washers, the inner ring diameter of the toothed circular ring washers is 3-6 cm, the outer ring diameter is 7-8 cm, and the thickness is 2-4 mm. It is made of an inorganic material resistant to high temperatures above 500°C. The longitudinal section of the toothed circular ring washers is tooth-shaped. The filter material to be tested is placed between the upper and lower pressure rings. The toothed circular ring washers of the upper and lower pressure rings are driven to open or close the filter material by the electric lifting motor to drive the lifting, so as to realize rapid sample change at high temperature and relax the experimental gas flow rate. The torque of the electric lifting motor is greater than 100 kg / m 2 .

2. The experimental device for characterizing the performance of catalytic filter materials for simulating the decomposition of dioxins combined with SCR denitrification according to claim 1 is characterized in that: The multi-channel gas supply system is a five-channel gas supply system, which is equipped with five standard gas cylinders, which are respectively filled with N2, O2, NO, NH3, and SO2 gases; the flow adjustment ranges of the mass flow controllers on the gas supply pipelines of N2, O2, NO, NH3, and SO2 gases are 0~5000 mL / min, 0~500 mL / min, 0~500 mL / min, 0~500 mL / min, and 0~500 mL / min, respectively, and the flow control error is ≤1mL / min; the precision injection pump is filled with dioxin stock solution, and the flow range of the precision injection pump is 10~1000 µl / min, with an accuracy of ±0.5%; the inner diameter of the high-temperature and corrosion-resistant pipeline is 3~6mm, and a detachable insulation sleeve is provided on the outside of the connecting pipeline outside the equipment between the outlet of the precision vaporization chamber, the high-precision temperature control unit and the smoke detection unit.

3. The experimental device for characterizing the performance of catalytic filter materials for simulating the decomposition of dioxins combined with SCR denitrification according to claim 2 is characterized in that: The gas mixing tank is a 0.3 L cylindrical stainless steel tank body, on which five air inlets connected to five air supply pipelines are equidistantly arranged. The gas mixing tank is provided with equidistant and evenly distributed porous plates to enable the gas entering the gas mixing tank to be quickly mixed and evenly mixed.

4. The experimental device for characterizing the performance of catalytic filter materials for simulating the decomposition of dioxins combined with SCR denitrification according to claim 1, characterized in that: The flue gas detection unit includes a denitrification flue gas analysis module, a dioxin collection or analysis module and a water vapor collection or analysis module, wherein a dust removal filter and a silica gel particle dehydrator are arranged between the denitrification flue gas analysis module and the rapid sampling catalytic reaction unit, and the denitrification flue gas analysis module contains O2, NO, NH3, and SO2 analysis modules; the dioxin collection or analysis module and the water vapor collection or analysis module are switched by a three-way valve so that the flue gas to be tested can directly reach the collection or analysis module.

5. The experimental device for characterizing the performance of catalytic filter materials for simulating the decomposition of dioxins combined with SCR denitrification according to claim 1, characterized in that: The tail gas treatment unit is composed of a sodium hydroxide alkali solution denitrification tail gas treatment device and an activated carbon particle absorption de-dioxin treatment device.

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