A new coal gas desulfurization tower

Abstract

The utility model discloses a novel coal gas desulfurization tower belongs to coal gas purification equipment technical field. Aiming at traditional desulfurization tower energy consumption is high, and the problem such as low efficiency, complex structure, this desulfurization tower includes pre-desulfurization tower, main desulfurization tower and regenerator, forms "pre-desulfurization - main desulfurization - regeneration" closed loop system. Pre-desulfurization tower is equipped with three layers of light porcelain plum blossom ring packing, and rich liquid is contacted with coal gas to realize preliminary desulfurization, and the bottom of main desulfurization tower is equipped with coal gas inlet, and four layers of light porcelain plum blossom ring packing of ladder type distribution cooperate lean liquid gravity flow and form countercurrent contact, and deep desulfurization, and regenerator makes rich liquid and air reaction and generates sulfur foam through injector, and realizes lean liquid gravity flow circulation using the height difference with main desulfurization tower. Main desulfurization tower wall adopts the steel of phi 9000mm, and wall thickness 20mm and is strengthened with annular channel steel, and the bottom is equipped with reducing transition section and optimizes airflow. The design realizes energy consumption to reduce significantly, and investment cost reduces through structural optimization and process planning, and improves desulfurization efficiency through multistage desulfurization mechanism, and has remarkable industrial application value.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal gas purification equipment, specifically relating to a new type of coal gas desulfurization tower, which is suitable for desulfurization treatment of sulfur-containing coal gas. Background Technology

[0002] In the field of coal gas desulfurization, traditional desulfurization towers have many shortcomings: some desulfurization towers rely on a large amount of power equipment to drive the gas-liquid flow, resulting in high energy consumption and high operating costs; the gas-liquid contact method is singular, making it difficult to guarantee desulfurization efficiency; and the equipment structure is complex, leading to high construction costs. To address these problems, this utility model provides a novel desulfurization tower with optimized structure. Through innovative tower body zoning design and process planning, it achieves a technological breakthrough of "low energy consumption, low investment, and high desulfurization efficiency." Utility Model Content

[0003] The present invention aims to provide a new type of coal gas desulfurization tower with reasonable structure, low energy consumption, low investment and excellent desulfurization effect, which solves the technical defects of traditional desulfurization towers in terms of energy consumption, cost and efficiency.

[0004] The technical solution adopted in this utility model is as follows:

[0005] 1. Overall structural composition

[0006] This novel desulfurization tower consists of three main parts, the structure and components of which are as follows:

[0007] Pre-desulfurization tower: Utilizing a three-layer lightweight ceramic plum blossom ring packing system, the rich liquor is driven by a rich liquor pump and flows downwards in a co-current manner with the sulfur-containing coal gas, achieving preliminary desulfurization. The pre-desulfurization tower is equipped with a rich liquor circulation system to ensure that the rich liquor continuously participates in the co-current contact reaction.

[0008] Main desulfurization tower: A gas inlet is set at the bottom of the tower, and the gas flows from bottom to top, forming a countercurrent contact with the lean liquid flowing down from the top of the tower. Four layers of light ceramic plum blossom ring packing are arranged inside the tower. The gas-liquid mass transfer is enhanced through a stepped distribution to achieve deep desulfurization.

[0009] The main desulfurization tower wall is made of Φ9000mm steel with a wall thickness of 20mm, and is reinforced by annular channel steel with a spacing of 3000mm on the outside; a transition section from Φ12000mm to Φ9000mm is set at the bottom to optimize airflow distribution.

[0010] Regeneration tower: Receives rich liquid from the rich liquid pump, and uses an ejector to ensure full contact and reaction between the rich liquid and air, completing the oxidation reaction in the regeneration section; the generated sulfur foam floats to the top and flows by gravity to the foam tank.

[0011] The regeneration tower is 13m high (the main desulfurization tower is 10m high). The height difference allows the regenerated lean liquor to flow directly to the top of the main desulfurization tower and be recycled for desulfurization.

[0012] 2. Connection relationship

[0013] The bottom of the pre-desulfurization tower is connected to the middle of the main desulfurization tower via a pipeline. The rich liquid outlet at the bottom of the main desulfurization tower is connected to the rich liquid inlet at the bottom of the regeneration tower via a pipeline; the lean liquid outlet of the regeneration tower is connected to the lean liquid inlet at the top of the main desulfurization tower via a pipeline, forming a closed-loop desulfurization system of "pre-desulfurization - main desulfurization - regeneration".

[0014] This utility model has the following beneficial effects:

[0015] (1) Significantly reduced energy consumption: The main desulfurization tower utilizes the gravity flow of lean liquor to achieve gas-liquid countercurrent contact, eliminating the need for an external lean liquor pump. The lean liquor from the regeneration tower flows by gravity to the main desulfurization tower, reducing the use of power equipment and lowering energy consumption.

[0016] (2) Reduced investment costs: The combined design of the pre-desulfurization tower and the main desulfurization tower simplifies the process flow, reduces the number of equipment such as pumps, reduces the complexity of pipeline layout, and effectively controls construction investment.

[0017] (3) Improved desulfurization efficiency: The pre-desulfurization tower achieves initial sulfur removal through co-current contact, while the main desulfurization tower achieves deep desulfurization through counter-current contact. Combined with the efficient oxidation and regeneration process of the regeneration tower, a multi-stage desulfurization mechanism is formed to ensure the desulfurization effect of coal gas. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model patent, the following related drawings are provided:

[0019] Figure 1 This is a schematic diagram of the structure of a new type of desulfurization tower. In the diagram: 1. Pre-desulfurization tower; 2. Regeneration tower; 3. Main desulfurization tower; 4. Rich liquid tank; 5. Gas inlet; 6. Gas outlet; 7. Lean liquid inlet; 8. Lean liquid outlet; 9. Rich liquid inlet ring pipe; 10. Rich liquid outlet; 11. Pre-desulfurization liquid inlet #1; 12. Pre-desulfurization liquid inlet #2; 13. Pre-desulfurization liquid inlet #3; 14. Pre-desulfurization liquid inlet #4; 15. Top cover; 16. Ejector; 17. Labyrinth diffuser; 18. Steam inlet; 19. Condensate outlet; 20. Sulfur foam annular tank; 21. Manhole; 22. Wire mesh demister. Detailed Implementation

[0020] To further understand this utility model, the following description is provided in conjunction with the accompanying drawings and specific embodiments. It should be noted that the direction of the dashed arrows in the drawings indicates the flow direction of the gas.

[0021] Pre-desulfurization tower desulfurization: Sulfur-containing coal gas is introduced from the coal gas inlet 5 at the top of the pre-desulfurization tower 1. The rich liquid is transported to the pre-desulfurization tower by the rich liquid pump. The gas and liquid contact in the three-layer light ceramic plum blossom ring packing area in a co-current manner. The rich liquid absorbs part of the sulfur in the coal gas. The coal gas after preliminary desulfurization enters the main desulfurization tower 3 from the bottom, and the rich liquid flows into the bottom of the main desulfurization tower 3.

[0022] Desulfurization in the main desulfurization tower: The pre-desulfurized coal gas flows upward from the bottom inlet of the main desulfurization tower 3. The lean liquid generated in the regeneration tower 2 flows by gravity to the top of the main desulfurization tower due to the height difference. The gas and liquid come into countercurrent contact in the area of ​​four layers of light ceramic plum blossom ring packing, and the sulfur is removed deeply through mass transfer reaction. The purified coal gas is discharged from the coal gas outlet 6 at the top of the tower. The lean liquid that has absorbed sulfur is transformed into rich liquid and flows into the regeneration tower 2.

[0023] Regeneration tower treatment: The rich liquor in regeneration tower 2 is mixed with air through an ejector and reacts to complete the oxidation reaction in the regeneration section, converting sulfides into sulfur foam. The sulfur foam floats to the top of regeneration tower 2 and flows by gravity into the sulfur foam annular tank 20 through a pipeline; the regenerated lean liquor flows by gravity to the top of the main desulfurization tower 3 for recycling due to the height difference.

[0024] This invention achieves efficient desulfurization of coal gas through structural optimization and process design, while reducing energy consumption and investment costs, and has significant industrial application value.

Claims

1. A novel gas desulfurization tower, characterized in that, The system comprises a pre-desulfurization tower, a main desulfurization tower, and a regeneration tower, forming a closed-loop desulfurization system of "pre-desulfurization - main desulfurization - regeneration". The pre-desulfurization tower is equipped with three layers of light ceramic plum blossom ring packing, and the rich liquid is driven by a rich liquid pump to contact the sulfur-containing coal gas in the same direction. The main desulfurization tower has a coal gas inlet at the bottom and is equipped with four layers of light ceramic plum blossom ring packing. The lean liquid flows down from the top of the tower by gravity and contacts the coal gas in the opposite direction. The regeneration tower uses an ejector to make the rich liquid react with the air, and the regenerated lean liquid flows to the top of the main desulfurization tower by gravity due to the height difference.

2. The novel gas desulfurization tower according to claim 1, characterized in that, The bottom of the pre-desulfurization tower is connected to the middle of the main desulfurization tower via a pipeline. The rich liquid outlet at the bottom of the main desulfurization tower is connected to the rich liquid inlet at the bottom of the regeneration tower via a pipeline. The lean liquid outlet at the regeneration tower is connected to the lean liquid inlet at the top of the main desulfurization tower via a pipeline.

3. The novel gas desulfurization tower according to claim 1, characterized in that, The main desulfurization tower wall is made of steel with a diameter of 9000mm and a wall thickness of 20mm. It is reinforced with annular channel steel with a spacing of 3000mm on the outside and a transition section with a diameter of 12000mm to 9000mm is set at the bottom.

4. The novel gas desulfurization tower according to claim 1, characterized in that, The regeneration tower is 13m high, the main desulfurization tower is 10m high, and a sulfur foam annular trough is set at the top of the regeneration tower, with sulfur foam flowing by gravity into the foam trough.

5. The novel gas desulfurization tower according to claim 1, characterized in that, The pre-desulfurization tower is equipped with a rich liquor circulation system to ensure that the rich liquor continuously participates in the co-current contact reaction.

6. The novel gas desulfurization tower according to claim 1, characterized in that, The four layers of lightweight ceramic plum blossom ring packing in the main desulfurization tower are distributed in a stepped manner to enhance gas-liquid mass transfer.

7. The novel gas desulfurization tower according to claim 1, characterized in that, The rich liquid in the regeneration tower is mixed with air through an injector, and the oxidation reaction is completed in the regeneration section to generate sulfur foam.

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