A gas uniform conversion system for flue gas acid production

Abstract

The present invention relates to a flue gas uniform distribution conversion system for acid production, which is composed of an air inlet pipe, an air outlet, a connecting pipe, a primary distribution plate, a shell, a secondary distribution plate, a catalyst layer and a tertiary distribution pipe. The gas uniform distribution conversion system for flue gas acid production of the present invention adopts a primary distribution plate, a secondary distribution plate and a tertiary distribution pipe, and its gas uniform distribution effect can be improved by 60%, the system resistance increase is less than 450Pa, and the cost increase is less than 2%. The SO2 flue gas is evenly distributed with small resistance, which can ensure the balanced reaction temperature of the catalyst layer, the temperature controllability of SO2 conversion to SO3 is strong, the catalyst activity is high, the catalytic life is long, the conversion efficiency is high, the energy consumption is low, and the operating cost is low. The gas uniform distribution conversion system of the present invention has a novel structural design, simple production and manufacturing, and is very suitable for acid production supporting the smelting system.

Description

Technical Field

[0001] The invention relates to a gas uniform distribution conversion system for flue gas acid production, and specifically belongs to the field of chemical equipment. Background Art

[0002] With the development of non-ferrous metallurgical oxygen-enriched smelting technology, SO 2 Flue gas acid production projects are increasingly moving towards large-scale development. Due to production process reasons, the gas needs to be evenly distributed in the catalyst layer of the converter, and the SO 2 Convert to SO 3 The flue gas is evenly distributed, which can avoid excessive reaction of the gas in some places and cause the temperature to be too high, resulting in the destruction of the catalyst activity, and can also avoid SO 2 The gas conversion rate is not high enough, which affects the subsequent process. At present, the central tube converter does not have a systematic gas distribution system. 2 The gas distribution effect is poor, and the local reaction temperature of the catalyst layer is too high, resulting in impaired catalyst activity and short service life. The gas uniform distribution conversion system of the present invention is provided with a primary distribution plate, a secondary distribution plate, and a tertiary distribution pipe, so that the gas uniform distribution effect reaching the surface of the catalyst layer is significantly improved, and the distribution effect is improved by more than 60%. The tertiary distribution pipe is arranged in a large converter, which prolongs the residence time of the gas in the catalyst layer and improves the conversion efficiency of the conversion layer near the central tube. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of uneven gas distribution, avoid local overreaction and excessive temperature of the catalyst layer, which may lead to the destruction of catalyst activity and improve conversion efficiency.

[0004] The present invention discloses a gas uniform distribution conversion system for flue gas acid production, which comprises an air inlet pipe (1), an air outlet tube (2), a connecting pipe (3), a primary distribution plate (4), a shell (5), a secondary distribution plate (6), a catalyst layer (7), and a tertiary distribution pipe (8). The structural design of the primary distribution plate (4), the secondary distribution plate (6), and the tertiary distribution pipe (8) ensures that SO 2 The flue gas diffuses evenly into the catalyst layer (7) and prolongs the SO 2 The residence time of flue gas in the catalyst layer (7) increases SO 2 Convert SO 3 efficiency;

[0005] The structure of the gas uniform conversion system:

[0006] The air inlet pipe (1) is connected to the connecting pipe (3); the top pipe wall of the connecting pipe (3) is connected to the outer wall of the air outlet cylinder (2), and the bottom pipe wall is connected to the shell (5); the first-level distribution plate (4) is connected between the inner wall of the connecting pipe (3) and the outer wall of the air outlet cylinder (2), and is in the shape of a ring, the outer diameter of the ring is the inner diameter of the connecting pipe (3), and the inner diameter of the ring is the outer diameter of the air outlet cylinder (2); the connecting pipe (3) and the shell (5) are connected by air-permeable mesh holes evenly formed on the first-level distribution plate (4); the second-level distribution plate (6) is evenly formed with air-permeable mesh holes. The air-permeable mesh is in a circular shape, the inner ring is connected to the outer wall of the air outlet cylinder (2), and the diameter of the outer ring is larger than the inner diameter of the connecting pipe (3); a breathable catalyst layer (7) is arranged inside the shell (5), and the catalyst layer (7) is connected to the inner wall of the shell (5) and the outer wall of the air outlet cylinder (2); the three-stage distribution pipe (8) is evenly arranged along the circumference of the outer wall of the air outlet cylinder (2), one end of the three-stage distribution pipe (8) is connected to the bottom of the air outlet cylinder (2), and the other end of the three-stage distribution pipe (8) is connected to the inside of the shell (5), and adopts a structure of being longer at the top and shorter at the bottom;

[0007] The operation process of the gas uniform conversion system:

[0008] SO 2 After the flue gas enters the connecting pipe (3) from the air inlet pipe (1), it flows vertically downward along the interlayer between the outer wall of the air outlet tube (2) and the inner wall of the connecting pipe (3) to the primary distribution plate (4); SO 2 After passing through the primary distribution plate (4), the flue gas is evenly distributed and enters the housing (5); a portion of the SO 2 The flue gas diffuses vertically downward through the mesh of the secondary distribution plate (6), and the other part of SO 2 The flue gas diffuses directly into the housing (5), causing SO 2 The flue gas is evenly distributed in the space between the inner wall of the shell (5) and the outer wall of the exhaust pipe (2), and flows vertically downward through the catalyst layer (7), thereby avoiding SO 2 The smoke gathers near the outer wall of the exhaust pipe (2); SO 2 The flue gas flows evenly through the catalyst layer (7) and is converted into SO 3 The reaction temperature of each part of the catalyst layer (7) is kept uniform; the SO 3 The gas enters the gas outlet tube (2) through a three-stage distribution pipe (8) having a long upper and short lower structure at the gas inlet, and then flows vertically upward in the gas outlet tube (2) to evenly distribute the gas to the converter system, thereby avoiding a large amount of SO 3 The gas enters the gas outlet (2) along the catalyst near the gas outlet (2), prolonging the SO 2 The reaction time of the flue gas in the catalyst layer (7).

[0009] The mesh apertures of the primary distribution plate (4) and the secondary distribution plate (6) are 40-150 mm, and the opening rate is 50%-65%.

[0010] The outer ring diameter of the secondary distribution plate (6) is 300-500 mm larger than the inner diameter of the connecting pipe (3).

[0011] The distance between the secondary distribution plate (6) and the catalyst layer (7) is not less than 1000 mm.

[0012] The sum of the cross-sectional areas of the three-stage distribution pipe (8) is not less than the cross-sectional area of ​​the air intake pipe (1).

[0013] Beneficial effects of the present invention:

[0014] The gas uniform distribution conversion system for flue gas acid production of the present invention adopts a primary distribution plate, a secondary distribution plate and a tertiary distribution pipe, and its gas uniform distribution effect can be improved by 60%, the system resistance increase is less than 450Pa, the cost increase is less than 2%, and SO 2 The flue gas is evenly distributed with low resistance, which can ensure the balanced reaction temperature of the catalyst layer. 2 Convert SO 3 The temperature controllability is strong, the catalyst activity is high, the catalytic life is long, the conversion efficiency is high, the energy consumption is low, and the operating cost is low. The system of the present invention has a novel structural design and is easy to produce, and is very suitable for acid production in the smelting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the gas uniform distribution conversion system for flue gas acid production of the present invention;

[0016] Figure 2-1 This is a front view of the primary distribution plate of the present invention;

[0017] Figure 2-2 A top view of a primary distribution plate of the present invention;

[0018] Figure 3-1 This is a front view of the secondary distribution plate of the present invention;

[0019] Figure 3-2 A top view of the secondary distribution plate of the present invention;

[0020] Figure 4-1 It is a partial front view of the connection between the gas outlet tube and the three-stage distribution pipe of the present invention;

[0021] Figure 4-2 It is a partial top view of the connection between the gas outlet tube and the three-stage distribution pipe of the present invention;

[0022] In the figure: 1. air inlet pipe; 2. air outlet pipe; 3. connecting pipe; 4. primary distribution plate; 5. shell; 6. secondary distribution plate; 7. catalyst layer; 8. tertiary distribution pipe. DETAILED DESCRIPTION

[0023] Example 1

[0024] SO 2 The gas uniform distribution converter system for flue gas acid production comprises an air inlet pipe (1), an air outlet tube (2), a connecting pipe (3), a primary distribution plate (4), a shell (5), a secondary distribution plate (6), a catalyst layer (7), and a tertiary distribution pipe (8);

[0025] The air inlet pipe (1) is connected to the connecting pipe (3); the first-stage distribution plate (4) has a circular cross-section, the outer diameter of the ring is the inner diameter of the connecting pipe (3), and the inner diameter of the ring is the outer diameter of the air outlet tube (2); the circular first-stage distribution plate (4) is evenly provided with air-permeable mesh holes, which are arranged between the connecting pipe (3) and the shell (5), so that the connecting pipe (3) and the shell (5) are connected;

[0026] The secondary distribution plate (6) is located inside the shell (5) and above the catalyst layer (7); the secondary distribution plate (6) is evenly provided with air-permeable mesh holes; the shell (5) is provided with an air-permeable catalyst layer (7); the bottom end of the air outlet tube (2) is connected to the shell (5) through evenly distributed tertiary distribution pipes (8); the air inlet of the tertiary distribution pipe (8) is a structure in which the pipe wall is longer at the top and shorter at the bottom;

[0027] The top pipe wall of the connecting pipe (3) is connected to the outer wall of the gas outlet cylinder (2) by welding, and the bottom pipe wall is connected to the wall of the shell (5) by welding; the first-level distribution plate (4) is respectively connected to the inner wall of the connecting pipe (3) and the outer wall of the gas outlet cylinder (2) by welding; the bottom of the shell (5) is connected to the outer wall of the gas outlet cylinder (3) by welding; and the third-level distribution pipe (8) is fixed to the bottom of the gas outlet cylinder (2) by welding.

[0028] Example 2

[0029] SO 2 After the flue gas enters the connecting pipe (3) from the air inlet pipe (1), it flows vertically downward along the interlayer between the outer wall of the air outlet tube (2) and the inner wall of the connecting pipe (3) to the primary distribution plate (4); SO 2 After passing through the primary distribution plate (4), the flue gas is evenly distributed and enters the housing (5); a portion of the SO 2 The flue gas diffuses vertically downward through the mesh of the secondary distribution plate (6), and the other part of SO 2 The flue gas diffuses directly into the housing (5), causing SO 2 The flue gas is evenly distributed in the space between the inner wall of the shell (5) and the outer wall of the exhaust pipe (2), and flows vertically downward through the catalyst layer (7), thereby avoiding SO2 The smoke gathers near the outer wall of the exhaust pipe (2); SO 2 The flue gas flows evenly through the catalyst layer (7) and is converted into SO 3 The reaction temperature of each part of the catalyst layer (7) is kept uniform; the SO 3 The gas enters the gas outlet tube (2) through a three-stage distribution pipe (8) having a long upper and short lower structure at the gas inlet, and then flows vertically upward in the gas outlet tube (2) to evenly distribute the gas to the converter system, thereby avoiding a large amount of SO 3 The gas enters the gas outlet (2) along the catalyst layer near the gas outlet (2), prolonging the SO 2 The reaction time of the flue gas in the catalyst layer (7).

Claims

1. A gas uniform conversion system for flue gas acid production, characterized in that: The gas uniform distribution conversion system comprises an air inlet pipe (1), an air outlet tube (2), a connecting pipe (3), a primary distribution plate (4), a shell (5), a secondary distribution plate (6), a catalyst layer (7), and a tertiary distribution pipe (8). The structural design of the primary distribution plate (4), the secondary distribution plate (6), and the tertiary distribution pipe (8) ensures that SO2 flue gas is uniformly diffused into the catalyst layer (7), prolongs the retention time of SO2 flue gas in the catalyst layer (7), and improves the efficiency of SO2 to SO3 conversion. The structure of the gas uniform conversion system: The air inlet pipe (1) is connected to the connecting pipe (3); the top pipe wall of the connecting pipe (3) is connected to the outer wall of the air outlet cylinder (2), and the bottom pipe wall is connected to the shell (5); the first-level distribution plate (4) is connected between the inner wall of the connecting pipe (3) and the outer wall of the air outlet cylinder (2), and is in the shape of a ring, the outer diameter of the ring is the inner diameter of the connecting pipe (3), and the inner diameter of the ring is the outer diameter of the air outlet cylinder (2); the connecting pipe (3) and the shell (5) are connected by air-permeable mesh holes evenly formed on the first-level distribution plate (4); the second-level distribution plate (6) is evenly formed with air-permeable mesh holes. The air-permeable mesh is in a circular shape, the inner ring is connected to the outer wall of the air outlet cylinder (2), and the diameter of the outer ring is larger than the inner diameter of the connecting pipe (3); a breathable catalyst layer (7) is arranged inside the shell (5), and the catalyst layer (7) is connected to the inner wall of the shell (5) and the outer wall of the air outlet cylinder (2); the three-stage distribution pipe (8) is evenly arranged along the circumference of the outer wall of the air outlet cylinder (2), one end of the three-stage distribution pipe (8) is connected to the bottom of the air outlet cylinder (2), and the other end of the three-stage distribution pipe (8) is connected to the inside of the shell (5), and adopts a structure of being longer at the top and shorter at the bottom; The operation process of the gas uniform conversion system: After the SO2 flue gas enters the connecting pipe (3) from the air inlet pipe (1), it flows vertically downward along the interlayer between the outer wall of the air outlet tube (2) and the inner wall of the connecting pipe (3) to the primary distribution plate (4); after the SO2 flue gas passes through the primary distribution plate (4), it enters the shell (5) in a uniformly distributed manner; a portion of the SO2 flue gas that passes through the primary distribution plate (4) diffuses vertically downward through the mesh of the secondary distribution plate (6), and another portion of the SO2 flue gas diffuses directly into the shell (5), so that the SO2 flue gas is evenly distributed in the space between the inner wall of the shell (5) and the outer wall of the air outlet tube (2), and flows vertically downward through the catalyst layer (7). , preventing SO2 flue gas from gathering near the outer wall of the gas outlet tube (2); SO2 flue gas flows through the catalyst layer (7) in a uniform distribution and is converted into SO3 gas therein, and the reaction temperature of each part of the catalyst layer (7) is kept balanced; SO3 gas flowing out of the catalyst layer (7) enters the gas outlet tube (2) through a three-stage distribution pipe (8) having a long upper and short lower structure at the gas inlet, and then flows out of the gas outlet tube (2) vertically upward. The gas uniform converter system prevents a large amount of SO3 gas from entering the gas outlet tube (2) along the catalyst near the gas outlet tube (2), thereby prolonging the reaction time of the SO2 flue gas in the catalyst layer (7).

2. A flue gas sulphuric acid uniform conversion system according to claim 1, characterized in that: The mesh apertures of the primary distribution plate (4) and the secondary distribution plate (6) are 40-150 mm, and the opening rate is 50%-65%.

3. The gas uniform conversion system for flue gas acid production according to claim 1, characterized in that: The outer ring diameter of the secondary distribution plate (6) is 300-500 mm larger than the inner diameter of the connecting pipe (3).

4. The gas uniform conversion system for flue gas acid production according to claim 1, characterized in that: The distance between the secondary distribution plate (6) and the catalyst layer (7) is not less than 1000 mm.

5. The gas uniform conversion system for flue gas acid production according to claim 1, characterized in that: The sum of the cross-sectional areas of the three-stage distribution pipe (8) is not less than the cross-sectional area of ​​the air intake pipe (1).

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