A blast furnace gas scrubbing and absorption tower

Abstract

This utility model discloses a blast furnace gas scrubbing and absorption tower, including a tower body. Multiple baffles within the tower body divide its interior into first, second, and third chambers. Gas towers are installed on the baffles. The first, second, and third chambers are sequentially connected via these gas towers. The first chamber is an alkaline scrubbing chamber, the second chamber is a fresh water scrubbing chamber, and the third chamber is an absorption chamber. The lower part of the first chamber has a scrubbing wastewater outlet and a blast furnace gas inlet, while the upper part has an alkaline spray nozzle. A structured packing layer A is installed in the middle of the first chamber. The lower part of the second chamber has a semi-scrubbing wastewater outlet, the middle part has an industrial water spray nozzle, and the upper part has a structured packing layer B. The lower part of the third chamber has an absorbent outlet, and the upper and middle parts of the third chamber both have absorbent spray nozzles and a structured packing layer C. This utility model achieves efficient deacidification, desulfurization, and decarbonization treatment of blast furnace gas.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace gas purification technology, specifically to a washing and absorption tower for deacidification, desulfurization, and decarbonization of blast furnace gas. Background Technology

[0002] Under the current upgraded environmental protection policies, the sulfur content in the exhaust gas after blast furnace gas combustion often fails to meet national emission requirements. Furthermore, the cost of back-end desulfurization is about 20% higher than front-end treatment, making blast furnace gas desulfurization technology a key focus in the metallurgical industry. Meanwhile, due to the widespread adoption of dry baghouse dust collectors in the past decade, components such as HCl and H2S in blast furnace gas react with condensate to form acidic liquids, causing severe corrosion of gas pipelines and equipment, potentially leading to safety accidents. Moreover, with the guidance and development trend of national carbon emission policies, the demand for deacidification, desulfurization, and decarbonization technologies for blast furnace gas will continue to increase, while current technologies for these processes still have significant shortcomings. Utility Model Content

[0003] The present invention aims to provide a blast furnace gas scrubbing and absorption tower to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a blast furnace gas scrubbing and absorption tower, comprising a tower body, wherein multiple baffles are provided inside the tower body to divide the inner cavity of the tower body into a first, second, and third chamber arranged sequentially from bottom to top, and gas towers are provided on the baffles, wherein the first, second, and third chambers are sequentially connected through the gas towers, the first chamber is an alkaline scrubbing chamber, the second chamber is a fresh water scrubbing chamber, and the third chamber is an absorption chamber, wherein a blast furnace gas emission channel communicating with the third chamber is provided at the top of the tower body;

[0005] The lower part of the first chamber is equipped with a washing wastewater outlet and a blast furnace gas inlet. The washing wastewater outlet is connected to a wastewater treatment system. The upper part of the first chamber is equipped with an alkaline spray nozzle for spraying alkaline solution. The middle part of the first chamber is equipped with a structured packing layer A, which is used to increase the contact area between the blast furnace gas and the alkaline solution.

[0006] The lower part of the second chamber is equipped with a semi-washing wastewater outlet, which is connected to an alkali solution preparation system. The alkali solution preparation system is used to provide spray alkali solution to the first chamber. The middle part of the second chamber is equipped with an industrial water nozzle for spraying industrial water. The upper part of the second chamber is equipped with a structured packing layer B, which is used to remove water and alkali solution from the washed blast furnace gas.

[0007] The lower part of the third chamber is provided with an absorbent outlet, and the upper and middle parts of the third chamber are provided with absorbent nozzles and structured packing layer C. The absorbent nozzles spray absorbent to absorb sulfides and carbon dioxide in the blast furnace gas. The absorbent nozzles are located above the structured packing layer C.

[0008] Preferably, the structured packing layer C in the middle of the third chamber consists of two layers arranged vertically, while the structured packing layer C in the upper part of the third chamber consists of one layer.

[0009] Preferably, the absorbent is a composite amine solution.

[0010] Preferably, the partitions between the first chamber and the second chamber, and between the second chamber and the third chamber, are all arc-shaped partitions with downward openings.

[0011] Preferably, the wastewater outlet of the first chamber is funnel-shaped.

[0012] Preferably, a structured packing layer D is provided in the blast furnace gas emission channel.

[0013] Preferably, the structured filler layer C includes a wire mesh.

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

[0015] (1) Blast furnace gas flows from bottom to top through the first chamber, the second chamber and the third chamber in sequence, removing HCl, dust particles, water and alkali, sulfides and carbon dioxide from the blast furnace gas in sequence. Finally, the blast furnace gas is discharged upward through the blast furnace gas discharge channel, completing the efficient deacidification, desulfurization and decarbonization process of blast furnace gas, meeting the national emission requirements for blast furnace gas, and with lower treatment costs and better results.

[0016] (2) The blast furnace gas scrubbing absorption tower of this utility model adopts a vertical tower structure, which integrates deacidification, desulfurization and decarbonization functions, greatly saving the floor space. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0018] Attached diagram labels: 1. Tower body, 2. Baffle plate, 3. Gas tower, 4. First chamber, 5. Second chamber, 6. Third chamber, 7. Blast furnace gas exhaust channel, 8. Washing wastewater outlet, 9. Blast furnace gas inlet, 10. Alkali spray nozzle, 11. Structured packing layer A, 12. Semi-washing wastewater outlet, 13. Alkali preparation system, 14. Industrial water spray nozzle, 15. Structured packing layer B, 16. Absorbent outlet, 17. Absorbent spray nozzle, 18. Structured packing layer C, 19. Structured packing layer D, 20. Wastewater treatment system. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] See Figure 1 As shown in the figure, as an embodiment of the present invention, a blast furnace gas scrubbing and absorption tower is provided, including a tower body 1. Multiple partitions 2 are provided inside the tower body 1 to divide the inner cavity of the tower body 1 into a first, second, and third chamber 6 arranged sequentially from bottom to top. A gas tower 3 is provided on the partition 2. The first chamber 4, the second chamber 5, and the third chamber 6 are sequentially connected through the gas tower 3. The first chamber 4 is an alkaline scrubbing chamber, the second chamber 5 is a fresh water scrubbing chamber, and the third chamber 6 is an absorption chamber. A blast furnace gas discharge channel 7 connected to the third chamber 6 is provided at the top of the tower body 1.

[0023] The lower part of the first chamber 4 is provided with a washing wastewater outlet 8 and a blast furnace gas inlet 9. The washing wastewater outlet 8 is connected to a wastewater treatment system 20. The upper part of the first chamber 4 is provided with an alkaline spray nozzle 10 for spraying alkaline solution. The middle part of the first chamber 4 is provided with a structured packing layer A11, which is used to increase the contact area between blast furnace gas and alkaline solution.

[0024] The lower part of the second chamber 5 is provided with a semi-washing wastewater outlet 12, and the semi-washing wastewater outlet 12 is connected to an alkaline solution preparation system 13. The alkaline solution preparation system 13 is used to provide spray alkaline solution to the first chamber 4. The middle part of the second chamber 5 is provided with an industrial water nozzle 14 for spraying industrial water. The upper part of the second chamber 5 is provided with a structured packing layer B15, which is used to remove water and alkaline solution from the washed blast furnace gas.

[0025] The lower part of the third chamber 6 is provided with an absorbent outlet 16. The upper and middle parts of the third chamber 6 are provided with absorbent nozzles 17 and structured packing layers C18. The absorbent nozzles 17 spray absorbent to absorb sulfides and carbon dioxide in the blast furnace gas. The absorbent nozzles 17 are located above the structured packing layers C18. The structured packing layers C18 in the middle of the third chamber 6 are arranged in two layers, one above the other. The structured packing layers C18 in the upper part of the third chamber 6 are one layer.

[0026] The working principle of this blast furnace gas scrubbing and absorption tower is as follows: Blast furnace gas is introduced into the first chamber 4 through the blast furnace gas inlet 9 and flows upward. Alkali spray nozzles 10 spray alkaline solution to wash the blast furnace gas, initially removing HCl and dust particles. The structured packing layer A11 increases the contact area between the blast furnace gas and the alkaline solution, making the alkaline scrubbing effect more thorough. The alkaline solution flows from top to bottom and finally accumulates at the bottom of the first chamber 4, then is discharged through the wastewater outlet 8 to the wastewater treatment system 20 for treatment. The blast furnace gas in the first chamber 4 continues to flow upward and is introduced into the second chamber 5 through the gas tower 3. Industrial water is sprayed from the nozzles, and the blast furnace gas is washed from bottom to top by the industrial water to remove residual HCl and particulate dust. At the same time, the alkaline solution entrained in the gas is diluted. The structured packing layer B15 removes water and alkaline solution from the washed blast furnace gas. Finally, the industrial water after washing collects from top to bottom at the bottom of the second chamber 5 and is discharged through the semi-washing wastewater outlet 12. Finally, it is transported through the pipeline to the alkaline solution preparation system 13 to provide spray alkaline solution for the first chamber 4. Then, the blast furnace gas in the second chamber 5 continues to flow upwards and is introduced into the third chamber 6 through the gas tower 3. The absorbent spray nozzle 17 sprays the absorbent liquid. The blast furnace gas flows upwards and comes into full contact with the absorbent liquid at the structured packing layer C18. The absorbent liquid absorbs the sulfides and carbon dioxide in the blast furnace gas. After being sprayed and absorbed by two layers of absorbent liquid, the blast furnace gas has sufficient absorption of sulfides and carbon dioxide. Then, it passes through the upper structured packing layer C18 to remove water and absorbent liquid from the blast furnace gas, while the absorbent liquid that has absorbed carbon dioxide and sulfides... The gas accumulates at the bottom of the third chamber 6 and is discharged to the outside through the absorbent outlet 16. Finally, the blast furnace gas is discharged upward through the blast furnace gas discharge channel 7, completing the efficient deacidification, desulfurization, and decarbonization process of the blast furnace gas. This meets the national emission requirements for blast furnace gas, has lower processing costs, better results, and can effectively prevent severe corrosion of gas pipelines and equipment, avoiding safety accidents. In addition, the blast furnace gas scrubbing absorption tower of this utility model adopts a vertical tower structure, integrating deacidification, desulfurization, and decarbonization functions, which greatly saves the floor space.

[0027] In this embodiment, the absorbent is a composite amine solution (MDEA+NHD), which improves the absorption of sulfides and carbon dioxide in blast furnace gas.

[0028] In this embodiment, the partitions 2 between the first chamber 4 and the second chamber 5, and between the second chamber 5 and the third chamber 6, are all arc-shaped partitions with downward openings, which facilitates the collection and discharge of liquid.

[0029] In this embodiment, the washing wastewater outlet 8 of the first chamber 4 is funnel-shaped, which facilitates the collection and discharge of alkaline solution.

[0030] In this embodiment, a structured packing layer D19 is provided in the blast furnace gas emission channel 7, which improves the removal effect of water and absorbent in the blast furnace gas.

[0031] In this embodiment, the structured packing layer C18 includes wire mesh, which is economical and has a better effect on removing water and absorbent from blast furnace gas.

[0032] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A blast furnace gas scrubbing and absorption tower, characterized in that: The tower body includes a multi-partitioned structure that divides the interior of the tower body into three chambers arranged sequentially from bottom to top: a first chamber, a second chamber, and a third chamber. Each partition has a gas tower, and the first, second, and third chambers are connected sequentially through the gas towers. The first chamber is an alkaline washing chamber, the second chamber is a fresh water washing chamber, and the third chamber is an absorption chamber. The top of the tower body has a blast furnace gas exhaust channel that connects to the third chamber. The lower part of the first chamber is equipped with a washing wastewater outlet and a blast furnace gas inlet. The washing wastewater outlet is connected to a wastewater treatment system. The upper part of the first chamber is equipped with an alkaline spray nozzle for spraying alkaline solution. The middle part of the first chamber is equipped with a structured packing layer A, which is used to increase the contact area between the blast furnace gas and the alkaline solution. The lower part of the second chamber is equipped with a semi-washing wastewater outlet, which is connected to an alkali solution preparation system. The alkali solution preparation system is used to provide spray alkali solution to the first chamber. The middle part of the second chamber is equipped with an industrial water nozzle for spraying industrial water. The upper part of the second chamber is equipped with a structured packing layer B, which is used to remove water and alkali solution from the washed blast furnace gas. The lower part of the third chamber is provided with an absorbent outlet, and the upper and middle parts of the third chamber are provided with absorbent nozzles and structured packing layer C. The absorbent nozzles spray absorbent to absorb sulfides and carbon dioxide in the blast furnace gas. The absorbent nozzles are located above the structured packing layer C.

2. The blast furnace gas scrubbing and absorption tower according to claim 1, characterized in that: The structured packing layer C in the middle of the third chamber consists of two layers arranged vertically, while the structured packing layer C in the upper part of the third chamber consists of one layer.

3. The blast furnace gas scrubbing and absorption tower according to claim 1, characterized in that: The absorbent is a composite amine solution.

4. The blast furnace gas scrubbing and absorption tower according to claim 1, characterized in that: The partitions between the first and second chambers, and between the second and third chambers, are all arc-shaped partitions with downward openings.

5. The blast furnace gas scrubbing and absorption tower according to claim 1, characterized in that: The wastewater outlet of the first chamber is funnel-shaped.

6. The blast furnace gas scrubbing and absorption tower according to claim 1, characterized in that: A structured packing layer D is installed in the blast furnace gas emission channel.

7. The blast furnace gas scrubbing and absorption tower according to claim 1, characterized in that: The structured filler layer C includes wire mesh.

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