CN115469050B - Test system and method for evaluating reaction performance of SCR catalyst - Google Patents

Test system and method for evaluating reaction performance of SCR catalyst Download PDF

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CN115469050B
CN115469050B CN202210871592.9A CN202210871592A CN115469050B CN 115469050 B CN115469050 B CN 115469050B CN 202210871592 A CN202210871592 A CN 202210871592A CN 115469050 B CN115469050 B CN 115469050B
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gas
reaction
catalyst
mixing
denitration
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CN115469050A (en
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贾曼
曾坚
顾仁栋
肖雨亭
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Guoneng Longyuan Catalyst Jiangsu Co ltd
Guoneng Longyuan Environmental Protection Co Ltd
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Guoneng Longyuan Catalyst Jiangsu Co ltd
Guoneng Longyuan Environmental Protection Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/10Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis

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  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

The invention relates to the technical field of SCR catalyst reaction performance test, in particular to a test system and a test method for evaluating the reaction performance of an SCR catalyst, wherein the system comprises a flue gas simulation device, a gas mixing device and a mixed heating device, the gas mixing device is used for mixing a plurality of gas components to obtain mixed gas, and the mixed heating device is used for mixing and heating the mixed gas and water to obtain simulated flue gas; the reaction device is used for carrying out denitration reaction on simulated flue gas and ammonia gas from the mixed heating equipment and comprises a reaction tube, wherein a catalyst test block is arranged in the reaction tube, and a fly ash sample strip is arranged in a pore canal of the catalyst test block; and the tail gas purifying device is used for purifying tail gas. By using the system, the influence degree of the flue gas and the fly ash on the reaction performance of the denitration catalyst can be rapidly and accurately predicted, and the system has important significance for guiding the design and selection of the denitration catalyst, the improvement of the process formula and the evaluation of the product performance.

Description

Test system and method for evaluating reaction performance of SCR catalyst
Technical Field
The invention relates to the technical field of SCR catalyst reaction performance test, in particular to a test system and a test method for evaluating the reaction performance of an SCR catalyst.
Background
At present, the problem of environmental pollution caused by nitrogen oxide emission is increasingly prominent, and nitrogen oxide emission control indexes of various industries are increasingly stringent. Besides the thermal power generation industry, non-electric industries such as steel, cement, glass kiln and the like begin to gradually implement ultra-low emission modification of atmospheric pollutants, control indexes are aligned to the thermal power generation industry, and the concentration of nitrogen oxides in the discharged flue gas is required to be less than 50mg/Nm 3
SCR (Selective Catalytic Reduction) denitration is a common denitration technology, which means a selective catalytic reduction denitration technology, and the denitration catalyst has the conditions of dust accumulation and blockage of pore channels, mechanical abrasion, micropore blockage, volatilization of active components, sintering, poisoning and the like in the operation process, so that the activity of the catalyst is attenuated. Research shows that alkali metal, alkaline earth metal, heavy metal, sulfate and the like mixed in the flue gas and the fly ash can be attached to the surface of the catalyst or permeate into micropores of the catalyst to occupy active sites of the surface of the catalyst, so that the diffusion of reaction gas in the micropores of the catalyst is hindered, the adsorption quantity of the reaction gas is reduced, and the reaction activity of the catalyst is reduced.
Therefore, a test system and a test method for evaluating the reaction performance of the SCR catalyst are needed, and the deactivation characteristic rule of the catalyst is researched by simulating the flue gas environment of the operation condition of the catalyst, so that the poisoning resistance performance of the catalyst is evaluated, which is an important index for comprehensively evaluating the quality of the catalyst product and is also an important guarantee for the normal operation of a flue gas denitration device.
Disclosure of Invention
The invention provides a test system and a test method for evaluating the reaction performance of an SCR catalyst, which are used for solving the problem that the prior art lacks a test system for evaluating the influence of flue gas and fly ash on the reaction performance of the SCR catalyst, and the influence degree of the flue gas and the fly ash on the reaction performance of the denitration catalyst can not be rapidly and accurately predicted.
In order to achieve the above object, a first aspect of the present invention provides a test system for evaluating the reactivity of an SCR catalyst, the system comprising:
the flue gas simulation device comprises a gas mixing device and a mixed heating device, wherein the gas mixing device is used for mixing a plurality of gas components to obtain mixed gas, and the mixed heating device is used for mixing and heating the mixed gas from the gas mixing device and water to obtain simulated flue gas;
the reaction device is used for carrying out denitration reaction on simulated flue gas and ammonia gas from the mixed heating equipment, and comprises a reaction tube, wherein a catalyst test block is arranged in the reaction tube, and a fly ash sample strip is arranged in a pore channel of the catalyst test block; and
and the tail gas purifying device is used for purifying the tail gas output after the denitration reaction of the reaction device.
Preferably, the mixed heating device comprises a preheating pipe and a first electric heating furnace wrapped outside the preheating pipe; preferably, the preheating pipe is a spiral pipe processed by 316L stainless steel, the diameter of the spiral pipe is 120-135mm, and the pitch of the spiral pipe is 20-35mm; preferably, the heating range of the first electric heating furnace is 0-650 ℃.
Preferably, the preheating pipe is connected with the reaction pipe through a heat preservation pipeline; preferably, the surface of the heat preservation pipeline is wrapped with ceramic fiber cotton, and the surface of the ceramic fiber cotton is wrapped with a heat tracing belt.
Preferably, the reaction device further comprises a second electric heating furnace wrapped outside the reaction tube; preferably, the heating range of the second electric heating furnace is 0-650 ℃.
Preferably, the reaction tube is a stainless steel cylindrical tube, the inner diameter of the cylindrical tube is 40-100mm, and the length of the cylindrical tube is 400-1400mm; preferably, the input port and the output port of the reaction tube are respectively provided with a quick-opening chuck, a gasket and a clamp for sealing; preferably, the input port and the output port of the reaction tube are both provided with temperature sensors, and the input port of the reaction tube is provided with a pressure sensor.
Preferably, a metal screen for placing a catalyst test block is arranged inside the reaction tube; preferably, the metal screen mesh has a pore size of 0.05-1.5mm.
Preferably, the fly ash sample strip comprises a cordierite honeycomb ceramic strip and pasty fly ash coated on the surface of the cordierite honeycomb ceramic strip.
Preferably, the tail gas purifying device comprises a condenser, a gas-liquid separator and an absorption device which are connected in sequence.
In order to achieve the above object, a second aspect of the present invention provides a test method for evaluating the reactivity of an SCR catalyst, the method being implemented using the system, the method comprising the steps of:
s1, mixing a plurality of gas components by adopting the gas mixing equipment according to a simulated working condition to obtain mixed gas, and mixing and heating the mixed gas and water from the gas mixing equipment by adopting the mixed heating equipment to obtain simulated flue gas;
s2, carrying out denitration reaction on the simulated flue gas and ammonia gas from the mixed heating equipment in the reaction device;
s3, purifying the tail gas output after the denitration reaction of the reaction device by adopting the tail gas purifying device;
s4, measuring the concentration of nitrogen oxides at the input port and the output port of the reaction tube at intervals, calculating to obtain data of denitration efficiency and activity of the catalyst test block, and forming an efficiency attenuation curve.
Preferably, the catalyst test block is prepared from a honeycomb SCR denitration catalyst.
Preferably, the fly ash sample strip is a honeycomb ceramic strip of cordierite material coated with pasty fly ash on the surface.
Preferably, the length of the catalyst test block is the same as the length of the cordierite honeycomb ceramic strip, and the difference between the width of the catalyst test block and the width of the cordierite honeycomb ceramic strip is not greater than 1mm.
According to the technical scheme, the system is used for obtaining simulated flue gas based on the flue gas simulation device, then, the simulated flue gas and ammonia gas are subjected to denitration reaction in the reaction device, and the tail gas output after the denitration reaction is purified by the tail gas purification device, so that the influence degree of the flue gas and fly ash on the reaction performance of the denitration catalyst can be rapidly and accurately predicted, and the system has important significance for guiding the design and selection of the denitration catalyst, the improvement of the process formula and the evaluation of the product performance.
Meanwhile, by arranging the preheating pipe to be a spiral pipe processed by 316L stainless steel, the diameter of the spiral pipe is 120-135mm, the spiral distance is 20-35mm, so that water can be quickly gasified, and the full mixing with gaseous components is accelerated.
The preheating pipe is connected with the reaction pipe through a heat preservation pipeline; preferably, the surface of the heat-insulating pipeline is wrapped with ceramic fiber cotton, and the surface of the ceramic fiber cotton is wrapped with a heat tracing belt, so that the simulated flue gas is prevented from being rapidly cooled in the heat-insulating pipeline, and the simulated flue gas temperature is prevented from fluctuating.
The quick-opening chuck, the gasket and the clamp for sealing are arranged at the input port and the output port of the reaction tube, so that the catalyst test block and the fly ash sample strip are convenient to replace while the tightness is ensured; the inlet and the outlet of the reaction tube are both provided with temperature sensors, the inlet of the reaction tube is provided with a pressure sensor, the temperature sensors are arranged for accurately monitoring temperature deviation before and after flue gas reaction, and the pressure sensors are arranged for monitoring whether a pipeline is blocked or not.
By arranging the inside of the reaction tube to be provided with a metal screen for placing the catalyst test block, preferably, the aperture of the screen mesh of the metal screen is 0.05-1.5mm for filtering fly ash in gas, thereby avoiding the blockage of the pipeline of the reaction tube.
Through setting up fly ash sample strip includes cordierite material's honeycomb ceramic strip and the paste fly ash of coating in cordierite material's honeycomb ceramic strip's surface, both guaranteed the simulation flue gas component and in the normal circulation of catalyst test piece's pore channel surface, accelerated the deposition rate in catalyst test piece pore channel of the material that easily leads to the catalyst test piece poisoning in the fly ash again, can evaluate the influence of simulation flue gas combination and fly ash two factor stack environment to catalyst test piece reactivity fast.
Drawings
FIG. 1 is a schematic diagram of a test system for SCR catalyst reactivity evaluation;
FIG. 2 is a schematic installation of a fly ash sample strip of a test system for SCR catalyst reactivity evaluation;
FIG. 3 is a flow chart of a test method for SCR catalyst reactivity assessment;
FIG. 4 is a graph showing the decay of denitration efficiency of the test piece of the catalyst of example 1 of the present invention.
Description of the reference numerals
A gas mixing device 1; a hybrid heating device 2; a preheating tube 21; a first electric heating furnace 22;
a reaction device 3; a reaction tube 31; a second electric heating furnace 32; a catalyst test block 33;
a fly ash sample strip 34; a condenser 4; a gas-liquid separator 5; an absorption device 6.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may include one or more such features either explicitly or implicitly; the meaning of "plurality" is two or more. The term "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, a possible presence or addition of one or more other features, elements, components, and/or combinations thereof.
Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The first aspect of the present invention provides a test system for evaluating the reactivity of an SCR catalyst, as shown in fig. 1-2, comprising:
the flue gas simulation device comprises a gas mixing device 1 and a mixing and heating device 2, wherein the gas mixing device 1 is used for mixing a plurality of gas components to obtain mixed gas, and the mixing and heating device 2 is used for mixing and heating the mixed gas and water from the gas mixing device 1 to obtain simulated flue gas;
the reaction device 3 performs denitration reaction on the simulated flue gas and ammonia gas from the mixed heating equipment 2 in the reaction device 3, the reaction device 3 comprises a reaction tube 31, a catalyst test block 33 is arranged in the reaction tube 31, and a fly ash sample strip 34 is arranged in a pore canal of the catalyst test block 33; and
and the tail gas purifying device is used for purifying the tail gas output after the denitration reaction of the reaction device 3.
According to the technical scheme, the system is used for obtaining simulated flue gas based on the flue gas simulation device, then, the simulated flue gas and ammonia gas are subjected to denitration reaction in the reaction device, and the tail gas output after the denitration reaction is purified by the tail gas purification device, so that the influence degree of the flue gas and fly ash on the reaction performance of the denitration catalyst can be rapidly and accurately predicted, and the system has important significance for guiding the design and selection of the denitration catalyst, the improvement of the process formula and the evaluation of the product performance.
In the test system for SCR catalyst reactivity evaluation according to the present invention, a first gas supply device for supplying a plurality of gas components into the gas mixing device 1 may be further included. The gas supplied into the gas mixing apparatus 1 through the first gas supply apparatus may be nitrogen, oxygen, nitrogen oxides, sulfur dioxide, hydrogen chloride, hydrogen sulfide, or the like. In a specific embodiment, the first gas supply device may include a plurality of gas cylinders respectively filled with gas components such as nitrogen, oxygen, nitrogen oxides, sulfur dioxide, hydrogen chloride, hydrogen sulfide and the like, and an output port of each gas cylinder is provided with a mass flow rate controller, so that different types of gases can be accurately output according to actual needs through the mass flow rate controller according to set flow rates. Wherein, all be provided with pressure regulating valve, check valve, ball valve and manometer on the air feed pipeline of a plurality of gas cylinders.
In the test system for evaluating the reactivity of an SCR catalyst according to the present invention, a second gas supply means for supplying ammonia gas into the reaction device 3 may be further included. Ammonia gas is supplied into the reaction tube 31 through the second gas supply device. In a specific embodiment, the second air supply device may include a gas cylinder filled with ammonia, and an output port of the gas cylinder is provided with a mass flow rate control meter, so as to accurately output the ammonia according to a set flow rate through the mass flow rate control meter according to actual needs. Wherein, be provided with pressure regulating valve, check valve, ball valve and manometer on the air feed pipeline of gas cylinder.
In the test system for evaluating the reactivity of an SCR catalyst according to the present invention, a water supply device for supplying water to the hybrid heating device 2 may be further included. Deionized water is supplied to the hybrid heating apparatus 2 through the water supply apparatus. In a specific embodiment, the water supply device is a water plug type metering pump, and the water plug type metering pump can supply deionized water into the mixing and heating device 2 according to actual needs and set flow.
In the hybrid heating device 2 according to the present invention, it is preferable that the hybrid heating device 2 includes a preheating pipe 21 and a first electric heating furnace 22 wrapped outside the preheating pipe 21. In a specific embodiment, the preheating pipe 21 is a spiral pipe made of 316L stainless steel, the pipe diameter of the spiral pipe is 120-135mm, and the spiral pitch is 20-35mm. Preferably, the diameter of the spiral tube is 125-130mm, and the pitch of the spiral tube is 25-30mm. For rapid gasification of water, accelerating thorough mixing with gaseous components. Wherein the heating range of the first electric heating furnace 22 is 0-650 ℃. Preferably, the heating range of the first electric heating furnace 22 is 0-600 ℃.
In the test system for evaluating the reactivity of an SCR catalyst according to the present invention, the preheating pipe 21 is connected to the reaction pipe 31 through a heat-retaining pipe. Preferably, the surface of the heat preservation pipeline is wrapped with ceramic fiber cotton. More preferably, the surface of the ceramic fiber cotton is wrapped with a heat tracing band. The method is used for avoiding the occurrence of rapid cooling of the simulated flue gas in the heat-preserving pipeline, so that the temperature fluctuation of the simulated flue gas is caused, and further the subsequent evaluation of the reaction performance of the catalyst test block 33 is influenced.
In the reaction apparatus 3 according to the present invention, it is preferable that the reaction apparatus 3 further includes a second electric heating furnace 32 wrapped outside the reaction tube 31. The heating range of the second electric heating furnace is 0-650 ℃. Preferably, the heating range of the second electric heating furnace is 0-600 ℃. In a specific embodiment, the reaction tube 31 is a cylindrical tube made of stainless steel, and the inner diameter of the cylindrical tube is 40-100mm, and the length of the cylindrical tube is 400-1400mm. Preferably, the inner diameter of the cylindrical tube is 60-80mm and the length is 500-1250mm. Further, the input port and the output port of the reaction tube 31 are provided with a quick-opening chuck, a gasket and a clamp for sealing. For making the catalyst test block 33 and the fly ash sample strip 34 more easily replaced while securing sealability. Still further, the input port and the output port of the reaction tube 31 are both provided with temperature sensors, and the input port of the reaction tube 31 is provided with a pressure sensor. Wherein, a temperature sensor is provided for accurately monitoring the temperature deviation before and after the gas reaction, preventing the temperature from affecting the evaluation of the reaction performance of the catalyst test block 33. The pressure sensor is arranged for monitoring whether a pipeline is blocked or not, so that the normal operation of the denitration reaction is ensured. Still further, the inside of the reaction tube 31 is provided with a metal screen for placing a catalyst test block. Preferably, the metal screen mesh has a pore size of 0.05-1.5mm. More preferably, the metal screen mesh has a pore size of 0.1 to 1.0mm. For filtering fly ash in the gas, avoiding clogging of the pipes of the reaction tube 31.
In the test system for evaluating the reactivity of the SCR catalyst according to the present invention, the fly ash sample bar 34 includes a cordierite honeycomb ceramic bar and a paste-like fly ash coated on the surface of the cordierite honeycomb ceramic bar. The normal circulation of the simulated flue gas components on the surface of the pore canal of the catalyst test block 33 is ensured, the deposition speed of substances in the fly ash, which are easy to cause the poisoning of the catalyst test block 33, in the pore canal of the catalyst test block 33 is accelerated, and the influence on the reaction performance of the catalyst test block 33 under the superposition environment of two factors of the simulated flue gas combination and the fly ash can be rapidly evaluated.
In the test system for evaluating the reaction performance of the SCR catalyst according to the present invention, the exhaust gas purifying apparatus includes a condenser 4, a gas-liquid separator 5, and an absorbing device 6, which are sequentially connected. The tail gas output after the denitration reaction is carried out by the reaction device 3 is firstly cooled to normal temperature by the condenser 4, then the condensed tail gas component is collected by the gas-liquid separator 5, and the residual tail gas reaches the emission standard after being treated by the absorption equipment 6 and is discharged to the air. Wherein, the tail gas purification device can reach more than 95% of tail gas purification rate.
As shown in fig. 3, the second aspect of the present invention further provides a test method for evaluating the reactivity of an SCR catalyst, the method being implemented using the system, the method comprising the steps of:
s1, mixing a plurality of gas components by adopting the gas mixing equipment 1 according to a simulated working condition to obtain mixed gas, and mixing and heating the mixed gas and water from the gas mixing equipment 1 by adopting the mixed heating equipment 2 to obtain simulated flue gas;
the step S1 specifically includes controlling the gas supply device to deliver multiple gas components into the gas mixing device 1 according to a set flow rate according to a simulated working condition, and delivering the mixed gas mixed by the gas mixing device 1 and deionized water supplied by the water plug type metering pump according to the set flow rate into the mixed heating device 2 for mixed heating to obtain simulated flue gas.
S2, carrying out denitration reaction on the simulated flue gas and ammonia gas from the mixed heating equipment 2 in the reaction device 3;
step S2 specifically includes delivering the simulated flue gas and the ammonia gas supplied according to the set flow rate to the reaction tube 31 for denitration reaction and outputting the tail gas.
S3, purifying the tail gas output after the denitration reaction of the reaction device 3 by adopting the tail gas purifying device;
the step S3 specifically includes configuring an alkaline and acidic two-stage absorption solution according to the type of the selected gas, purifying the tail gas output after the denitration reaction by the reaction device 3, and discharging the tail gas.
S4, measuring the concentration of nitrogen oxides at the input and output ports of the reaction tube 31 at intervals, calculating to obtain data of denitration efficiency and activity of the catalyst test block 33, and forming an efficiency attenuation curve.
In the test method for evaluating the reactivity of the SCR catalyst according to the present invention, in a specific embodiment, the catalyst test block 33 is prepared using a honeycomb SCR denitration catalyst. The fly ash sample strip 34 is a honeycomb ceramic strip of cordierite material coated with paste-like fly ash on the surface. Preferably, the length of the catalyst test block 33 is the same as the length of the cordierite honeycomb ceramic strip, and the difference between the width of the catalyst test block 33 and the width of the cordierite honeycomb ceramic strip is not greater than 1mm. Preferably, the difference between the width of the catalyst test block 33 and the width of the cordierite honeycomb ceramic strip is about 1mm.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
Example 1
Simulating flue gas conditions of working conditions of a glass kiln
According to the working condition of the glass kiln, controlling the gas supply equipment to convey sulfur dioxide to the gas mixing equipment 1 together at a supply speed of 1.0L/min, nitric oxide and nitrogen of 0.37L/min and 60.3L/min, and conveying the mixed gas output after mixing by the gas mixing equipment 1 and deionized water supplied by a water plug type metering pump of 5.60mL/min to the mixed heating equipment 2 together for mixed heating to obtain simulated flue gas; wherein, in the mixing process of the mixing heating device 2, the heating temperature of the first electric heating furnace 22 is controlled to be 400 ℃; the supply flow adjustment range of sulfur dioxide is 0-12L/min, the supply flow adjustment range of nitric oxide is 0-5L/min, the supply flow adjustment range of nitrogen is 0-120L/min, and the supply flow adjustment range of deionized water is 0.01-10 mL/min;
ammonia gas and simulated flue gas are conveyed to the reaction tube 31 together at the supply speed of 0.37L/min for denitration reaction and tail gas is output; wherein, during the reaction, the heating temperature of the second electric heating furnace 32 is controlled to be 390 ℃; wherein, the supply flow regulation range of the ammonia gas is 0-5L/min; the catalyst test block 33 is a sample with a cross section of 3×3 holes, a length of 30cm, and a pore diameter of 7.1mm taken from the fresh honeycomb SCR denitration catalyst; the fly ash sample strips 34 are 9 honeycomb ceramic strips made of cordierite with the width of 6.8mm and the length of 30cm, the ceramic strips are soaked and wetted in deionized water, the outer surfaces of the periphery of the ceramic strips are uniformly coated with glass kiln fly ash paste, the pore channels of the honeycomb ceramic strips are plugged by the glass kiln fly ash paste, the prepared 9 fly ash sample strips 34 are respectively plugged into 9 pore channels of the catalyst test block 33, and then the catalyst test block 33 is placed at a metal screen in the reaction tube 31;
according to the type of the selected gas, alkaline and acidic two-stage absorption liquid is configured, so that the tail gas output after the denitration reaction of the reaction device 3 is sequentially purified by a condenser 4, a gas-liquid separator 5 and an absorption device 6 and then discharged;
wherein, the simulation test process is carried out for 96 hours, the concentration of nitrogen oxides at the input port and the output port of the reaction tube 31 is measured every 24 hours, data of the denitration efficiency and the activity of the catalyst test block 33 are obtained through calculation, as shown in table 1, and a denitration efficiency attenuation curve graph of the catalyst test block 33 is formed, as shown in fig. 4;
table 1: denitration efficiency of catalyst test block changing with time
Duration/h 0 24 48 72 96
Denitration efficiency/% 48.91 46.11 41.44 30.56 25.41
From table 1 and fig. 4, it can be known that, based on the embodiment 1 of the present invention, the influence degree of the flue gas and the fly ash on the reaction performance of the denitration catalyst can be rapidly and accurately predicted, and the method has important significance for guiding the design and selection of the denitration catalyst, the improvement of the process formula and the evaluation of the product performance.
According to the test system and the test method for evaluating the reaction performance of the SCR catalyst, provided by the invention, the simulated flue gas is obtained based on the flue gas simulation device, then the simulated flue gas and ammonia gas are subjected to denitration reaction in the reaction device, and the tail gas output after the denitration reaction is purified by using the tail gas purification device, so that the influence degree of the flue gas and fly ash on the reaction performance of the denitration catalyst can be rapidly and accurately predicted, and the test system and the test method have important significance in guiding the design selection, the process formula improvement and the product performance evaluation of the denitration catalyst.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a plurality of simple variants can be made to the technical proposal of the invention, and in order to avoid unnecessary repetition, the invention does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (16)

1. A test system for evaluating the reactivity of an SCR catalyst, the system comprising:
the flue gas simulation device comprises a gas mixing device (1) and a mixing heating device (2), wherein the gas mixing device (1) is used for mixing a plurality of gas components to obtain mixed gas, and the mixing heating device (2) is used for mixing and heating the mixed gas and water from the gas mixing device (1) to obtain simulated flue gas;
the device comprises a reaction device (3), wherein simulated flue gas and ammonia gas from the mixed heating equipment (2) are subjected to denitration reaction in the reaction device (3), the reaction device (3) comprises a reaction tube (31), a catalyst test block (33) is arranged in the reaction tube (31), and a fly ash sample strip (34) is arranged in a pore canal of the catalyst test block (33); and
the tail gas purifying device is used for purifying the tail gas output after the denitration reaction of the reaction device (3);
a metal screen for placing a catalyst test block is arranged in the reaction tube (31);
the fly ash sample strip (34) comprises a cordierite honeycomb ceramic strip and pasty fly ash coated on the surface of the cordierite honeycomb ceramic strip.
2. The system according to claim 1, characterized in that the hybrid heating device (2) comprises a preheating tube (21) and a first electric heating furnace (22) wrapped outside the preheating tube (21).
3. The system according to claim 2, characterized in that the preheating pipe (21) is a spiral pipe made of 316L stainless steel, the pipe diameter of the spiral pipe being 120-135mm, the pitch of the spiral pipe being 20-35mm.
4. The system according to claim 2, characterized in that the heating range of the first electric heating furnace (22) is 0-650 ℃.
5. The system according to claim 2, characterized in that the preheating tube (21) is connected to the reaction tube (31) by means of a holding conduit.
6. The system of claim 5, wherein the surface of the insulated conduit is wrapped with ceramic fiber wool and the surface of the ceramic fiber wool is wrapped with a heat trace tape.
7. The system according to any one of claims 1 to 6, characterized in that the reaction device (3) further comprises a second electric heating furnace (32) wrapped outside the reaction tube (31).
8. The system according to claim 7, characterized in that the heating range of the second electric heating furnace (32) is 0-650 ℃.
9. The system according to claim 1, wherein the reaction tube (31) is a cylindrical tube of stainless steel, the inner diameter of the cylindrical tube being 40-100mm and the length being 400-1400mm.
10. The system according to claim 9, characterized in that the inlet and outlet of the reaction tube (31) are provided with quick-opening chucks, gaskets and clamps for sealing.
11. The system according to claim 9, characterized in that the inlet and the outlet of the reaction tube (31) are provided with temperature sensors, and the inlet of the reaction tube (31) is provided with a pressure sensor.
12. The system of claim 1, wherein the metal screen mesh has a pore size of 0.05-1.5mm.
13. The system according to claim 1, characterized in that the exhaust gas purification device comprises a condenser (4), a gas-liquid separator (5) and an absorption device (6) connected in sequence.
14. A test method for evaluating the reactivity of an SCR catalyst, characterized in that the method is carried out using the system according to any one of claims 1 to 13, the method comprising the steps of:
s1, mixing a plurality of gas components by adopting the gas mixing equipment (1) according to a simulated working condition to obtain mixed gas, and mixing and heating the mixed gas from the gas mixing equipment (1) and water by adopting the mixed heating equipment (2) to obtain simulated flue gas;
s2, carrying out denitration reaction on the simulated flue gas and ammonia gas from the mixed heating equipment (2) in the reaction device (3);
s3, purifying the tail gas output after the denitration reaction of the reaction device (3) by adopting the tail gas purifying device;
s4, measuring the concentration of nitrogen oxides at the input port and the output port of the reaction tube (31) at intervals, calculating to obtain data of denitration efficiency and activity of the catalyst test block (33), and forming an efficiency attenuation curve.
15. The method according to claim 14, characterized in that the catalyst test block (33) is prepared using a honeycomb SCR denitration catalyst.
16. The method of claim 14, wherein the length of the catalyst test block (33) is the same as the length of the cordierite honeycomb ceramic strip, and wherein the difference between the pore size of the catalyst test block (33) and the width of the cordierite honeycomb ceramic strip is no greater than 1mm.
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