Device for testing filtering performance of filter material under simulated flue gas thermal state working condition

Abstract

The invention discloses a device for testing the filtering performance of a filter material under a simulated flue gas thermal state working condition, a gas distribution method simulated basic flue gas system and a reaction system, the gas distribution method simulated basic flue gas system comprises gas supply pipelines, a dust generator and a coil preheater, the gas distribution method simulated basic flue gas is adopted, a gas source comprises compressed air, SO2, N2, NH3, NO, O2 and CO, and the reaction system comprises a gas supply pipeline, a dust generator and a coil preheater. Firstly, N2, SO2 and NO are mixed and heated to Max300-350 DEG C, then a dust generator, NH3, O2 and CO are respectively heated to Max400-450 DEG C through a coil preheater, and finally mixed gas is uniformly mixed and heated to Max400-450 DEG C in a dirty gas vertical secondary mixing pipeline and then enters a reaction system. The testing system provides a filtering performance testing instrument which integrates the functions of high temperature, dust, SOx gas and NOx gas. The performance of the filter material can be tested and evaluated under complex working conditions, the concentration of flue gas components before and after the filter material is detected, and data such as dust removal and denitration synergism efficiency, SO2 conversion rate, NH3 escape rate and pressure drop are obtained to provide reliable guarantee for design and material selection of a filter bag.

Description

Technical Field

[0001] The invention relates to a testing device, in particular to a testing device for filtering performance of filter material under a simulated flue gas hot state working condition. Background Art

[0002] Bag dust collectors (filter bags) are mainly used in flue gas treatment and dust removal systems in steel mills, cement plants, power plants, etc., and flue gas filtration in waste incineration, coal-fired boilers, fluidized bed boilers, etc. The selection of filter bags should strive for high-efficiency filtration, easy dust removal and durability. However, the information that affects the use of filter bags, such as the temperature and humidity, acidity and alkalinity, and dust particle size in the dust collector, cannot be directly obtained, which has a direct impact on the design of the filter bags.

[0003] Based on the foundation of existing products and relevant test standard methods, it is designed for the evaluation of filter materials under complex working conditions. Summary of the invention

[0004] In order to solve the problem that the filtering performance of filter materials is difficult to test under complex working conditions, the present invention needs to provide a filter material filtering performance testing device under a simulated flue gas hot state working condition.

[0005] The present invention provides the following technical solutions:

[0006] A device for testing the filtering performance of filter materials under a simulated flue gas hot state condition comprises a basic flue gas system and a reaction system simulated by a gas distribution method, wherein the basic flue gas system simulated by a gas distribution method comprises various gas supply pipelines, a dust generator and a coil preheater, wherein the gas source comprises compressed air, SO2, N2, NH3, NO, O2 and CO, wherein N2, SO2 and NO are first mixed and heated to Max300-350°C, and then the dust generator, NH3, O2 and CO are respectively heated to Max400-450°C through a coil preheater, the compressed air in the dust generator carries dust, and finally the mixed gas is evenly mixed in a dirty gas vertical secondary mixing pipeline and heated to Max400°C before entering the reaction system, wherein the reaction system comprises a reactor and an ash box, and the bottom of the reactor is connected to the ash box.

[0007] Furthermore, one side of the upper part of the reactor is connected to each gas supply pipeline, and the other side of the upper part of the reactor is connected to a valve group, a differential pressure gauge and a condenser. The upper end of the condenser is provided with a circulating return water CWR, and the lower end of the condenser is provided with a circulating supply water CWS.

[0008] Furthermore, the reactor includes an outer tube and an L-shaped inner tube, the top of the outer tube has an air inlet and an air outlet, the air inlet is connected to each air supply pipeline, and the air outlet is connected to a valve group, a differential pressure gauge and a condenser.

[0009] Furthermore, the L-shaped inner tube is located inside the outer tube, the L-shaped inner tube is divided into a lead-in tube end and a reaction tube, the top of the lead-in tube end is aligned with the gas outlet end, the reaction tube is placed inside the outer tube, and a plurality of air holes are opened on the side wall of the reaction tube.

[0010] Furthermore, the flue gas flow rate is between 0.1 and 12 m 3 / h interval adjustable, compressed air flow adjustment Max12m 3 / h.

[0011] Compared with the prior art, the invention has the following beneficial effects: the test system provides a high temperature, dust, SO x Gas, NO x The gas function integrated filtration performance test instrument can test and evaluate the performance of the filter material under complex working conditions, detect the concentration of flue gas components before and after the filter material, and obtain the data of dust removal and denitrification efficiency, SO2 conversion rate, NH3 escape rate, pressure drop, etc. to provide reliable guarantee for the design and material selection of filter bags. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] Figure 2 This is a structural diagram of the reactor of the present invention.

[0014] 1. Each gas supply pipeline, 2. Dust generator, 3. Coil preheater, 4. Reactor, 41. Outer tube, 411. Inlet end, 412. Outlet end, 42. L-shaped inner tube, 421. Lead pipe end, 422. Reaction tube, 423. Air hole, 5. Ash box, 6. Valve group, 7. Differential pressure gauge, 8. Condenser, 9. Back-blowing gas collecting tank. Implementation

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 and 2The present invention provides a filter material filtration performance test device under a simulated flue gas hot state working condition, including a basic flue gas system and a reaction system simulated by a gas distribution method. The basic flue gas system simulated by a gas distribution method includes each gas supply pipeline 1, a dust generator 2 and a coil preheater 3. The basic flue gas is simulated by a gas distribution method. The gas source includes compressed air, SO2, N2, NH3, NO, O2, and CO. First, N2, SO2 (heating and insulation at 35-50°C), and NO are mixed and heated to Max300-350°C. Then, the dust generator 2 (compressed air carries dust), NH3, O2, and CO are heated to Max400-450°C respectively through the coil preheater 3. Finally, the mixed gas is mixed and evenly heated to Max400-450°C in the dirty gas vertical secondary mixing pipeline and then enters the reaction system. The temperature control accuracy is ±1°C to ensure that the heating temperature is above the dew point of the mixed gas to prevent condensation. Each heating module adopts independent program temperature control, and each heating module is equipped with two temperature sensors.

[0018] Smoke flow rate is 0.1~12m 3 / h interval adjustable, compressed air flow adjustment Max 12m 3 / h.

[0019] The reaction system includes a reactor 4 and an ash box 5. The bottom of the reactor 4 is connected to the ash box 5. One side of the upper part of the reactor 4 is connected to a gas supply pipeline 1. The other side of the upper part of the reactor 4 is connected to a valve group 6, a differential pressure gauge 7, a condenser 8 and a back-blowing gas collecting tank 9. The upper end of the condenser 8 is provided with a circulating return water CWR, and the lower end of the condenser is provided with a circulating supply water CWS.

[0020] On the left side of valve K3 of valve group 6 is backflush gas collecting tank 9, which stores a certain amount of gas. By manually or automatically opening valve K4, particulate matter accumulated on the filter cloth surface in the reactor can be purged, and valve K3 can be controlled to continuously or manually replenish backflush gas.

[0021] The reactor includes an outer tube 41 and an L-shaped inner tube 42. The top of the outer tube 41 has an air inlet 411 and an air outlet 412. The air inlet 411 is connected to each air supply pipeline 1, and the air outlet 412 is connected to the valve group 6, the differential pressure gauge 7 and the condenser 8. The reactor can simulate the high-temperature tail gas directly discharged from the industrial boiler.

[0022] The L-shaped inner tube 42 is located inside the outer tube 41 and is divided into a lead-in tube end 421 and a reaction tube 422. The top of the lead-in tube end 421 is aligned with the gas outlet end 412. The reaction tube is placed inside the outer tube and a plurality of air holes 423 are opened on the side wall of the reaction tube.

[0023] The entire system pipeline is heated and insulated throughout the process, and the maximum flue gas heating temperature reaches 400°C. The vertical and horizontal pipelines are made of stainless steel SS316L. The entire gas pipeline, valves, and joints are made of stainless steel EP grade 316L or materials with stronger performance requirements. They are smooth, corrosion-resistant, and high-temperature resistant.

[0024] The characteristics of the reactor of the present invention are:

[0025] 1. Overall closed design and double-layer jacket play a better role in gas sealing and thermal insulation;

[0026] 2. It is convenient to test filter materials of different sizes, and can perform uninterrupted testing to remove accumulated dust without stopping the reaction. It can also detect the filter material reaction and dust accumulation without stopping the reaction, and can perform automatic or manual backblowing, simulating the conditions of catalyst submersion caused by excessive dust in industrial situations.

[0027] An ash box 5 is installed at the lower part of the reactor 4. The ash box is an independent ash collecting box, which is independently sealed and can be taken out independently without affecting the temperature and pressure changes in the reactor.

[0028] The testing device of the present invention combines the catalyst with the existing filter cloth in various ways. The equipment simulates the exhaust gas, flue gas and other particulate pollutants emitted by the factory and may contain them, and tests the reaction of the filter cloth with adsorbed catalyst to harmful substances in the exhaust gas and flue gas.

[0029] This equipment can not only simulate flue gas, but also mix pollutants and perform uninterrupted testing. It can simulate the reaction effect multiple times and for a long time without stopping the reaction. It is equipped with automatic or manual backflush function to simulate the actual situation where excessive dust causes the catalyst to be submerged or covered. This is also a design feature that allows this equipment to operate for a long time.

[0030] This test system provides a high temperature, dust, SO x Gas, NO x The gas function integrated filtration performance test instrument can test and evaluate the performance of the filter material under complex working conditions, detect the concentration of flue gas components before and after the filter material, and obtain the data of dust removal and denitrification efficiency, SO2 conversion rate, NH3 escape rate, pressure drop, etc. to provide reliable guarantee for the design and material selection of filter bags.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A filter material filtration performance test device under simulated flue gas hot state working conditions, characterized by: The invention comprises a basic flue gas system and a reaction system simulated by a gas distribution method. The basic flue gas system simulated by a gas distribution method comprises gas supply pipelines (1), a dust generator (2) and a coil preheater (3). The gas source comprises compressed air, SO2, N2, NH3, NO, O2 and CO. First, N2, SO2 and NO are mixed and heated to Max300-350°C. Then, the dust generator (2), NH3, O2 and CO are respectively heated to Max400-450°C through the coil preheater (3). The compressed air in the dust generator (2) carries dust. Finally, the mixed gas is evenly mixed in a dirty gas vertical secondary mixing pipeline and heated to Max400-450°C before entering the reaction system. The reaction system comprises a reactor (4) and an ash box (5). The bottom of the reactor (4) is connected to the ash box (5).

2. The device for testing the filtering performance of filter material under the simulated flue gas hot state working condition according to claim 1, characterized in that: One side of the upper part of the reactor (4) is connected to a gas supply pipeline (1), and the other side of the upper part of the reactor (4) is connected to a valve group (6), a differential pressure gauge (7) and a condenser (8). The upper end of the condenser (8) is provided with a circulating water return CWR, and the lower end of the condenser is provided with a circulating water supply CWS.

3. The device for testing the filtering performance of filter material under the simulated flue gas hot state working condition according to claim 1, characterized in that: The reactor comprises an outer tube (41) and an L-shaped inner tube (42); the outer tube (41) has an air inlet end (411) and an air outlet end (412) at the top; the air inlet end (411) is connected to each air supply pipeline (1); and the air outlet end (412) is connected to a valve group (6), a differential pressure gauge (7) and a condenser (8).

4. The device for testing the filtering performance of filter material under the simulated flue gas hot state working condition according to claim 1, characterized in that: The L-shaped inner tube (42) is located inside the outer tube (41). The L-shaped inner tube (42) is divided into a tube guide end (422) and a reaction tube (423). The top of the tube guide end (422) is aligned with the gas outlet end (412). The reaction tube (423) is placed inside the outer tube (41). The side wall of the reaction tube (423) is provided with a plurality of gas holes (424).

5. The device for testing the filtering performance of filter material under the simulated flue gas hot state working condition according to claim 1, characterized in that: Smoke flow rate is 0.1~12m 3 / h interval adjustable, compressed air flow adjustment Max12m 3 / h.

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