An integrated denitrification and dust removal device based on powder catalyst

Abstract

An integrated denitration and dust removal device based on powder catalyst includes a device body, a waste catalyst discharge pipe, multiple groups of double-layer filter bag assemblies, a desulfurizer pipe, an ammonia pipe, a support frame, a partition, a support plate, a powder catalyst storage bin, a compressed air pipe, multiple primary blowing pipes and multiple secondary blowing pipes; a purification bin is formed on the upper part of the device body, and an air outlet is arranged on the top of the purification bin; a waste ash hopper is integrated at the bottom of the device body; the middle part of the device body is connected to the discharge end of the waste gas feed pipe; the double-layer filter bag assembly includes a dust removal filter bag located on the outer layer and a secondary denitration filter bag located on the inner layer; the discharge port of the powder catalyst storage bin is connected to a compressed air pipe; the compressed air pipe passes through the device body and extends into the inside of the device body. In the present invention, the desulfurization, denitration and dust removal of coke oven flue gas in the device are integrated, which well meets the characteristics of compactness and small footprint of the coke oven site, and the equipment has high desulfurization, denitration and dust removal efficiency.

Description

Technical Field

[0001] The present invention relates to the field of denitration and dust removal equipment, and in particular to a denitration and dust removal integrated equipment based on a powder catalyst. Background Art

[0002] Coal is the main energy supply in my country. It accounts for a large proportion of the energy structure of thermal power, metallurgy, chemical industry and other industries. Especially with the rapid development of economy, the demand for coal has greatly increased, which has brought about an increase in coal consumption. The flue gas or industrial waste gas generated during the combustion of coal contains a large amount of pollutants such as dust, sulfur dioxide, nitrogen oxides, etc., which are heavy precursors of pollutants such as regional haze, wide-area acid rain and global environmental pollution. If it is directly discharged into the atmosphere, it will seriously pollute the atmosphere and worsen the living environment of human beings. At present, with the formulation of various national environmental protection policies and emission standards, it is required that flue gas must be installed with dust removal, desulfurization and denitrification equipment for purification, and can only be discharged after meeting the emission indicators.

[0003] At present, relatively independent devices are generally used for desulfurization, denitrification and dust removal in flue gas, that is, "desulfurization" is responsible for "desulfurization", "denitrification" is responsible for "denitrification", and "dust removal" is responsible for "dust removal". The three devices of "desulfurization" + "denitrification" + "dust removal" are used together, which has problems such as long process flow, large footprint, and poor system load matching.

[0004] In order to solve the above problems, the present application proposes an integrated denitrification and dust removal equipment based on a powder catalyst, specifically, an integrated device for dry desulfurization, SCR denitrification and bag dust removal of coke oven flue gas based on a powder catalyst. Summary of the invention

[0005] (I) Purpose of the invention

[0006] In order to solve the technical problems existing in the background technology, the present invention proposes an integrated denitrification and dust removal equipment based on a powder catalyst.

[0007] (II) Technical solution

[0008] In order to solve the above problems, the present invention provides an integrated denitration and dust removal device based on a powder catalyst, comprising a device body, a waste catalyst discharge pipe, multiple groups of double-layer filter bag assemblies, a desulfurizer pipe, an ammonia pipe, a support frame, a partition, a support plate, a powder catalyst storage bin, a compressed air pipe, multiple primary blowing pipes and multiple secondary blowing pipes;

[0009] A purification chamber is formed on the upper part of the device body, and a gas outlet is arranged on the top of the purification chamber; a waste ash hopper is integrally arranged at the bottom of the device body, and a ash outlet is arranged at the bottom of the waste ash hopper; the middle part of the device body is connected to the discharge end of the waste gas feed pipe, and the waste gas feed pipe is simultaneously connected to the discharge ends of the desulfurizer pipe and the ammonia pipe;

[0010] The partition is arranged above the middle part of the device body, the support plate is arranged below the middle part of the device body, and the support frame is arranged on the partition; multiple groups of double-layer filter bag assemblies are arranged side by side and vertically inside the device body, wherein the upper part of the double-layer filter bag assembly is arranged on the support frame, and the lower part thereof is arranged on the support plate; the double-layer filter bag assembly includes a dust removal filter bag located on the outer layer and a secondary denitration filter bag located on the inner layer; the lower end of the double-layer filter bag assembly is connected to the waste catalyst discharge pipe through a pipeline; the discharge end of the waste catalyst discharge pipe passes through the outside of the device body;

[0011] The discharge port of the powder catalyst storage bin is connected to a compressed air pipe; the compressed air pipe passes through the device body and extends into the interior of the device body; the air inlet end of the compressed air pipe is connected to the air outlet of the high-pressure jet, and the air outlet end of the compressed air pipe is respectively connected to the air inlets of multiple first-level blowing pipes and the air inlets of second-level blowing pipes; the jet direction of the second-level blowing pipe is toward the outer surface of the dust removal filter bag; the air outlet of the first-level blowing pipe extends into the interior of the double-layer filter bag assembly, and its jet direction is toward the surface of the second-level denitrification filter bag.

[0012] Preferably, the particle size of the powder catalyst in the powder catalyst storage bin is less than 20 μm.

[0013] Preferably, the powder catalyst is a porous catalyst.

[0014] Preferably, it is characterized in that the angle between the inner wall of the waste ash hopper and the horizontal plane is greater than 60 degrees.

[0015] Preferably, the device body is made of carbon steel.

[0016] The above technical solution of the present invention has the following beneficial technical effects:

[0017] The present invention is an integrated device for dry desulfurization, SCR denitrification and bag dust removal of coke oven flue gas based on powder catalyst; the jet direction of the secondary blowing pipe is toward the outer surface of the dust removal filter bag, and the jet direction of the primary blowing pipe is toward the surface of the secondary denitrification filter bag; the desulfurizer and ammonia are mixed with the high-temperature flue gas and enter the device body together; SO2 in the high-temperature flue gas reacts with the desulfurizer, and the reaction byproducts are captured by the dust removal filter bag and discharged through the ash outlet of the waste ash hopper. The desulfurized gas passes through the dust removal filter bag and reaches the surface of the secondary denitrification filter bag, and reacts with the split catalyst sprayed on the surface of the secondary denitrification filter bag to undergo a denitrification reaction. The byproducts of the denitrification reaction and part of the powder catalyst fall into the waste catalyst discharge pipe and are discharged. Among them, the upper part of the double-layer filter bag assembly is arranged on the support frame, and the lower part thereof is arranged on the support plate. The outer layer of the double-layer filter bag assembly realizes the dust removal function, and the inner layer realizes the denitrification function. Under timing (or constant differential pressure) conditions, the double-layer filter bag assembly is purged by the primary blowing pipe and the secondary blowing pipe respectively, and the captured dust and denitrification by-products are discharged from the corresponding independent exhaust ports without affecting each other, thereby realizing the integration of desulfurization, denitrification and dust removal of coke oven flue gas in the device, which well meets the characteristics of compact coke oven site and small footprint, and the equipment has high desulfurization, denitrification and dust removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the integrated denitrification and dust removal equipment based on powder catalyst proposed in the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0020] like Figure 1 As shown, the present invention proposes an integrated denitration and dust removal device based on a powder catalyst, comprising a device body 2, a waste catalyst discharge pipe 6, a plurality of double-layer filter bag assemblies 13, a desulfurization agent pipe 7, an ammonia pipe 8, a support frame 15, a partition 16, a support plate 17, a powder catalyst storage bin 10, a compressed air pipe 14, a plurality of primary blowing pipes 11 and a plurality of secondary blowing pipes 12;

[0021] A purification chamber is formed on the upper part of the device body 2, and an air outlet 4 is arranged on the top of the purification chamber; a waste ash hopper 3 is integrally arranged at the bottom of the device body 2, and an ash outlet 5 is arranged at the bottom of the waste ash hopper 3; the middle part of the device body 2 is connected to the discharge end of the waste gas feed pipe 1, and the waste gas feed pipe 1 is simultaneously connected to the discharge ends of the desulfurizer pipe 7 and the ammonia pipe 8;

[0022] The partition 16 is arranged above the middle of the device body 2, the support plate 17 is arranged below the middle of the device body 2, and the support frame 15 is arranged on the partition 16; multiple groups of double-layer filter bag assemblies 13 are arranged side by side and vertically inside the device body 2, wherein the upper part of the double-layer filter bag assembly 13 is arranged on the support frame 15, and the lower part thereof is arranged on the support plate 17; the double-layer filter bag assembly 13 includes a dust removal filter bag 131 located on the outer layer and a secondary denitration filter bag 132 located on the inner layer; the lower end of the double-layer filter bag assembly 13 is connected to the waste catalyst discharge pipe 6 through a pipeline; the discharge end of the waste catalyst discharge pipe 6 passes through the outer side of the device body 2;

[0023] The discharge port of the powder catalyst storage bin 10 is connected to a compressed air pipe 14; the compressed air pipe 14 passes through the device body 2 and extends into the interior of the device body 2; the air inlet end of the compressed air pipe 14 is connected to the air outlet of the high-pressure jet, and the air outlet end of the compressed air pipe 14 is respectively connected to the air inlets of multiple first-level blowing pipes 11 and the air inlets of the second-level blowing pipes 12; the jet direction of the second-level blowing pipe 12 is toward the outer surface of the dust removal filter bag 131; the air outlet of the first-level blowing pipe 11 extends into the interior of the double-layer filter bag assembly 13, and its jet direction is toward the surface of the second-level denitrification filter bag 132.

[0024] In an optional embodiment, the device body 2 is made of carbon steel.

[0025] The present invention is an integrated device for dry desulfurization, SCR denitrification and bag dust removal of coke oven flue gas based on powder catalyst; during operation, the first-level blowing pipe 11 and the second-level blowing pipe 12 spray the double-layer filter bag assembly 13 respectively, wherein the jet direction of the second-level blowing pipe 12 is toward the outer surface of the dust removal filter bag 131, and the jet direction of the first-level blowing pipe 11 is toward the surface of the second-level denitrification filter bag 132; the high-temperature flue gas enters the interior of the device body 2 through the exhaust gas feed pipe 1, and at the same time, the desulfurizer enters the exhaust gas feed pipe 1 through the desulfurizer pipe 7, and the ammonia enters the exhaust gas feed pipe 1 through the ammonia pipe 8, thereby realizing that the desulfurizer and ammonia are mixed with the high-temperature flue gas and enter the device body 2 together.

[0026] In the present invention, SO2 in the high-temperature flue gas reacts with the desulfurizer to undergo a desulfurization reaction, and the reaction byproducts are captured by the dust removal filter bag 131 and discharged through the ash outlet 5 of the waste ash hopper 3. The desulfurized gas passes through the dust removal filter bag 131 to reach the surface of the secondary denitration filter bag 132, and undergoes a denitration reaction with the split catalyst sprayed on the surface of the secondary denitration filter bag 132. The byproducts of the denitration reaction and part of the powder catalyst fall into the waste catalyst discharge pipe 6 and are discharged. Among them, the upper part of the double-layer filter bag assembly 13 is arranged on the support frame 15, and the lower part thereof is arranged on the support plate 17. The outer layer of the double-layer filter bag assembly 13 realizes the dust removal function, and the inner layer realizes the denitration function.

[0027] Under timed (or constant differential pressure) conditions, the double-layer filter bag assembly 13 is purged by the primary blowing pipe 11 and the secondary blowing pipe 12 respectively, and the captured dust and denitrification by-products are discharged from corresponding independent exhaust ports respectively without affecting each other, thereby realizing the integrated desulfurization, denitrification and dust removal of coke oven flue gas in the device, which well meets the characteristics of compact coke oven site and small footprint, and the equipment has high desulfurization, denitrification and dust removal efficiency.

[0028] In an optional embodiment, the particle size of the powder catalyst in the powder catalyst storage bin 10 is less than 20 μm.

[0029] In an optional embodiment, the powder catalyst is a porous catalyst.

[0030] It should be noted that the powder catalyst is a catalyst in powder form with a particle size specification of less than 20μm that is obtained by crushing the recycled catalyst and then processing it. A new catalyst in powder form that meets the particle size specification (less than 20μm) can also be used. The powder catalyst is sprayed on the outer layer of the secondary denitrification filter bag 132 at regular intervals. The powder catalyst has the advantages of large gas-solid contact area, good denitrification catalytic reaction effect, and strong load adaptability, which can greatly reduce the investment cost of the system.

[0031] In an optional embodiment, the angle between the inner wall of the waste ash hopper 3 and the horizontal plane is greater than 60 degrees, so as to improve the discharge speed and efficiency.

[0032] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A denitrification and dust removal integrated equipment based on powder catalyst, characterized in that: It comprises a device body (2), a waste catalyst discharge pipe (6), a plurality of double-layer filter bag assemblies (13), a desulfurizing agent pipe (7), an ammonia pipe (8), a support frame (15), a partition (16), a support plate (17), a powder catalyst storage bin (10), a compressed air pipe (14), a plurality of primary blowing pipes (11) and a plurality of secondary blowing pipes (12); A purification chamber is formed at the upper part of the device body (2), and a gas outlet (4) is arranged at the top of the purification chamber; a waste ash hopper (3) is integrally arranged at the bottom of the device body (2), and a ash outlet (5) is arranged at the bottom of the waste ash hopper (3); the middle part of the device body (2) is connected to the discharge end of the waste gas feed pipe (1), and the waste gas feed pipe (1) is simultaneously connected to the discharge ends of the desulfurizer pipe (7) and the ammonia pipe (8); A partition (16) is arranged above the middle of the device body (2), a support plate (17) is arranged below the middle of the device body (2), and a support frame (15) is arranged on the partition (16); a plurality of groups of double-layer filter bag assemblies (13) are arranged side by side and vertically inside the device body (2), wherein the upper part of the double-layer filter bag assembly (13) is arranged on the support frame (15), and the lower part thereof is arranged on the support plate (17); the double-layer filter bag assembly (13) comprises a dust removal filter bag (131) located on the outer layer and a secondary denitration filter bag (132) located on the inner layer; the lower end of the double-layer filter bag assembly (13) is connected to a waste catalyst discharge pipe (6) through a pipeline; and the discharge end of the waste catalyst discharge pipe (6) passes through the outer side of the device body (2); The discharge port of the powder catalyst storage bin (10) is connected to a compressed air pipe (14); the compressed air pipe (14) passes through the device body (2) and extends into the device body (2); the air inlet end of the compressed air pipe (14) is connected to the air outlet of the high-pressure jet, and the air outlet end of the compressed air pipe (14) is respectively connected to the air inlets of a plurality of first-level blowing pipes (11) and the air inlets of a second-level blowing pipe (12); the jetting direction of the second-level blowing pipe (12) is toward the outer surface of the dust removal filter bag (131); the air outlet of the first-level blowing pipe (11) extends into the interior of the double-layer filter bag assembly (13), and its jetting direction is toward the surface of the second-level denitration filter bag (132); The particle size of the powder catalyst in the powder catalyst storage bin (10) is less than 20 μm; The angle between the inner wall of the waste ash hopper (3) and the horizontal plane is greater than 60 degrees.

2. The integrated denitration and dust removal equipment based on powder catalyst according to claim 1 is characterized in that: Powder catalyst is a porous catalyst.

3. The integrated denitration and dust removal equipment based on powder catalyst according to claim 1 is characterized in that: The device body (2) is made of carbon steel.

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