A semi-buried blast furnace gas desulfurization tower and a working method thereof

Abstract

This invention discloses a semi-buried blast furnace gas desulfurization tower and its operating method, belonging to the field of desulfurization tower technology. The invention includes a lower tower body and an upper tower body. The lower tower body has a lower tower steel plate inner wall on its outer ring, and a lower tower concrete outer wall on its outer ring. The upper tower body is located above the lower tower body. Both the lower and upper tower bodies are filled with internal packing devices. The bottom sides of the lower and upper tower bodies are connected to the gas inlet pipe, and the upper sides of the lower and upper tower bodies are connected to the gas outlet pipe. This invention divides the desulfurization tower into a lower tower body and an upper tower body, placing the lower tower body underground and the upper tower body above ground. This effectively reduces the tower's footprint, facilitates the hoisting of the internal packing devices, and ensures safe and reliable operation. It can adapt to conditions such as large blast furnace gas flow, low pressure, and complex composition, and has high operational value and economic benefits.

Description

Technical Field

[0001] This invention relates to the field of desulfurization tower technology, and more specifically, to a semi-buried blast furnace gas desulfurization tower and its working method. Background Technology

[0002] In response to the problem of excessive SO2 emissions from the combustion of blast furnace gas, a byproduct of steel enterprises, end-of-pipe treatment, i.e., desulfurization of the flue gas after combustion, has been the traditional approach. However, with the adjustment of national industrial policies, the emission requirements for SO2 have been significantly increased, and end-of-pipe treatment is no longer sufficient to meet the emission standards. This necessitates that steel enterprises implement precise desulfurization of blast furnace gas at the source.

[0003] Methods for fine desulfurization of blast furnace gas at its source mainly fall into two categories: dry and wet desulfurization. Regardless of the method used, the blast furnace gas desulfurization tower is the primary equipment. Because the industrial application of fine desulfurization of blast furnace gas is still in its early stages, the desulfurization towers developed by various companies are not yet fully perfect. The large flow rate, low pressure, and complex composition of blast furnace gas place high demands on the desulfurization tower.

[0004] Existing blast furnace gas desulfurization towers are all exposed tall tower structures, which have the following drawbacks during use: the tower body occupies a large area, the tower body is tall, it is not convenient to hoist the internal packing device, the maintenance operation is relatively cumbersome, and it is dangerous. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve

[0006] To address the shortcomings and deficiencies of existing technologies, this invention provides a semi-buried blast furnace gas desulfurization tower and its operating method. This invention divides the desulfurization tower into a lower tower body and an upper tower body, with the lower tower body located underground and the upper tower body located above ground. This effectively reduces the floor space occupied by the tower body, facilitates the hoisting of the packing device inside the tower, and ensures safe and reliable operation. It can adapt to conditions such as large blast furnace gas flow, low pressure, and complex composition, and has high operational value and economic benefits.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0009] The present invention provides a semi-buried blast furnace gas desulfurization tower, comprising a lower tower body and an upper tower body. The lower tower body is provided with a lower tower steel plate inner wall on its outer ring, and a lower tower concrete outer wall is provided on its outer ring. The lower part of the lower tower steel plate inner wall is provided with a lower tower arc-shaped bottom plate, and the upper part of the lower tower steel plate inner wall is provided with a lower tower top plate.

[0010] A central column is provided at the center of the lower tower body, and an upper tower body is provided at the top of the lower tower body. The interior of both the lower tower body and the upper tower body is filled with tower packing devices, and an upper tower body top plate is provided at the top of the upper tower body.

[0011] The bottom sides of the lower tower body and the upper tower body are respectively connected to the gas inlet pipe, and the upper sides of the lower tower body and the upper tower body are respectively connected to the gas outlet pipe.

[0012] Furthermore, a compensating material layer is filled between the inner wall of the lower tower steel plate and the outer wall of the lower tower concrete.

[0013] Furthermore, the lower tower arc-shaped bottom plate is welded to the inner wall of the lower tower steel plate. The lower tower arc-shaped bottom plate is arc-shaped to facilitate drainage, and several lower drainage outlets are opened on the surface of the arc-shaped bottom plate.

[0014] Furthermore, the top plate of the lower tower body is assembled from several sector-shaped plates, each of which can be disassembled to facilitate the periodic hoisting and replacement of the packing device inside the tower.

[0015] Furthermore, the packing device inside the tower is used to fill the desulfurizing agent.

[0016] Furthermore, the gas inlet pipe is connected in sequence to an upper tower airflow distributor and a lower tower airflow distributor, with the lower tower airflow distributor extending into the lower tower body; the upper tower airflow distributor extends into the upper tower body, and the upper tower airflow distributor and the gas inlet pipe are detachably assembled.

[0017] Furthermore, the lower tower body is located underground, while the upper tower body is located above ground.

[0018] Furthermore, during normal adsorption operation of the desulfurization tower, blast furnace gas enters the lower tower body and the upper tower body respectively from the gas inlet pipe. The gas inlet pipe is connected in sequence to the upper tower airflow distributor and the lower tower airflow distributor. The gas passes evenly through the packing device inside the tower through the upper tower airflow distributor and the lower tower airflow distributor. The packing device inside the tower is filled with desulfurizing agent material for adsorbing H2S and COS in the gas.

[0019] Furthermore, after the desulfurization tower has been running for a period of time, the desulfurizing agent becomes saturated with adsorption. At this point, the system switches to desorption mode through pipelines and valve groups. The gas inlet pipe becomes the inlet for high-temperature gas desorption, and the gas outlet pipe becomes the outlet for desorbed crude gas. The saturated desulfurizing agent recovers its adsorption capacity after high-temperature desorption.

[0020] Furthermore, if the desulfurizing agent becomes completely ineffective and cannot be desorbed and utilized after long-term operation, it needs to be replaced. At this time, the top plate of the upper tower body is removed, and then the airflow distributor of the upper tower and the top plate of the lower tower body are removed in sequence. The packing device inside the lower tower body is lifted out and replaced, and then the packing device inside the upper tower body is lifted out and replaced.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] This invention splits the desulfurization tower into a lower tower body and an upper tower body, with the lower tower body located underground and the upper tower body located above ground. This effectively reduces the floor space occupied by the tower body, facilitates the hoisting of the packing device inside the tower, and ensures safe and reliable operation. It can adapt to conditions such as large flow rate, low pressure, and complex composition of blast furnace gas, and has high operational value and economic benefits. Attached Figure Description

[0024] Figure 1 This is an overall structural diagram of the present invention;

[0025] Figure 2 This is a state diagram of the desulfurization tower of the present invention;

[0026] Figure 3 This is a structural diagram of the top plate of the lower tower body of the present invention;

[0027] Figure 4 This is a partial cross-sectional view of the lower tower body of the present invention.

[0028] In the diagram: 1. Lower tower body; 101. Lower tower concrete outer wall; 102. Lower tower steel plate inner wall; 103. Lower tower arc-shaped bottom plate; 104. Central column; 105. Lower tower body top plate; 106. Lower drainage outlet; 107. Tower packing device; 108. Gas inlet pipe; 109. Gas outlet pipe; 110. Compensation material layer; 111. Lower tower airflow distributor; 2. Upper tower body; 201. Upper tower body top plate; 202. Upper tower airflow distributor. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Example 1

[0031] from Figure 1As can be seen, a semi-buried blast furnace gas desulfurization tower of this embodiment includes a lower tower body 1 and an upper tower body 2. The lower tower body 1 is provided with a lower tower steel plate inner wall 102 on the outer ring, and a lower tower concrete outer wall 101 is provided on the outer ring of the lower tower steel plate inner wall 102. The lower part of the lower tower steel plate inner wall 102 is provided with a lower tower arc-shaped bottom plate 103, and the upper part of the lower tower steel plate inner wall 102 is provided with a lower tower top plate 105.

[0032] A central column 104 is provided at the center of the lower tower body 1. The central column 104 is a steel structure column used to support the internal components of the tower. An upper tower body 2 is provided on the upper part of the lower tower body 1. The interior of both the lower tower body 1 and the upper tower body 2 is filled with tower filling device 107. The top of the upper tower body 2 is provided with an upper tower body top plate 201.

[0033] The bottom sides of the lower tower body 1 and the upper tower body 2 are connected to the gas inlet pipe 108, and the upper sides of the lower tower body 1 and the upper tower body 2 are connected to the gas outlet pipe 109.

[0034] from Figure 4 It can be seen that a compensating material layer 110 is filled between the inner wall 102 of the lower tower steel plate and the outer concrete wall 101 of the lower tower. The outer concrete wall 101 of the lower tower is used to resist soil pressure, stabilize the tower body, and play a certain role in waterproofing. The compensating material layer 110 is used to compensate for the temperature deformation of the inner wall of the lower tower steel plate.

[0035] The lower tower arc-shaped bottom plate 103 is welded to the inner wall 102 of the lower tower steel plate. The lower tower arc-shaped bottom plate 103 is arc-shaped to facilitate drainage. Several lower drainage outlets 106 are opened on the surface of the arc-shaped bottom plate 3. The drainage is discharged into the water collection well for treatment.

[0036] from Figure 3 It can be seen that the top plate 105 of the lower tower body is assembled from several sector plates. Each sector plate can be disassembled to facilitate the periodic hoisting and replacement of the packing device 107 inside the tower.

[0037] The tower filling device 107 is used to fill the desulfurizing agent, and the tower filling device 107 is composed of detachable hoisting modules.

[0038] The lower tower body 1 is located underground, while the upper tower body 2 is located on the ground. This effectively reduces the floor space occupied by the tower body, facilitates the hoisting of the internal packing device 107, and ensures safe and reliable operation.

[0039] Example 2

[0040] from Figure 1As can be seen, in this embodiment of a semi-buried blast furnace gas desulfurization tower, an upper tower airflow distributor 202 and a lower tower airflow distributor 111 are connected sequentially on the gas inlet pipe 108. The lower tower airflow distributor 111 extends into the lower tower body 1; the upper tower airflow distributor 202 extends into the upper tower body 2, and the upper tower airflow distributor 202 and the gas inlet pipe 108 are detachably assembled.

[0041] During normal adsorption operation of the desulfurization tower, blast furnace gas enters the lower tower body 1 and the upper tower body 2 from the gas inlet pipe 108. The gas inlet pipe 108 is connected in sequence to the upper tower airflow distributor 202 and the lower tower airflow distributor 111. The gas passes through the upper tower airflow distributor 202 and the lower tower airflow distributor 111 evenly through the packing device 107 inside the tower. The packing device 107 inside the tower is filled with desulfurizing agent material, which is used to adsorb H2S and COS in the gas.

[0042] The gas inlet pipe 108 is used for exhaust. After the gas is purified by the desulfurizing agent in the packing device 107 inside the tower, it is discharged from the tower body.

[0043] Example 3

[0044] from Figure 2 As can be seen, in the working method of a semi-buried blast furnace gas desulfurization tower in this embodiment, after the desulfurization tower has been running for a period of time, the desulfurizing agent becomes saturated. At this time, the system switches to the desorption state through pipelines and valve groups. At this time, the gas inlet pipe 108 becomes the high-temperature gas inlet for desorption, and the gas outlet pipe 109 becomes the desorption crude gas outlet. The saturated desulfurizing agent restores its adsorption capacity after high-temperature desorption.

[0045] Example 4

[0046] This embodiment describes a method for operating a semi-buried blast furnace gas desulfurization tower. After the desulfurizing agent has been running for a long time and has completely failed and can no longer be desorbed and utilized, it needs to be replaced. At this time, the top plate 201 of the upper tower body is removed, and then the upper tower airflow distributor 202 and the lower tower top plate 105 are removed in sequence. The packing device 107 inside the lower tower body 1 is lifted out and replaced, and then the packing device 107 inside the upper tower body 2 is lifted out and replaced.

[0047] This invention divides the desulfurization tower into a lower tower body 1 and an upper tower body 2, with the lower tower body 1 located underground and the upper tower body 2 located on the ground. This effectively reduces the floor space occupied by the tower, facilitates the hoisting of the packing device 107 inside the tower, and ensures safe and reliable operation. It can adapt to conditions such as large flow rate, low pressure, and complex composition of blast furnace gas, and has high operational value and economic benefits.

[0048] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for operating a semi-buried blast furnace gas desulfurization tower, wherein the desulfurization tower structure includes a lower tower body (1) and an upper tower body (2), characterized in that: When the desulfurization tower is in normal adsorption operation, the blast furnace gas enters the lower tower body (1) and the upper tower body (2) from the gas inlet pipe (108). The gas inlet pipe (108) is connected in sequence to the upper tower airflow distributor (202) and the lower tower airflow distributor (111). The gas passes through the upper tower airflow distributor (202) and the lower tower airflow distributor (111) and passes evenly through the packing device (107) inside the tower. The packing device (107) inside the tower is filled with desulfurizing agent material for adsorbing H2S and COS in the gas.

2. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 1, characterized in that: After the desulfurization tower has been running for a period of time, the desulfurizing agent becomes saturated. At this time, the system switches to the desorption state through pipelines and valve groups. At this time, the gas inlet pipe (108) becomes the high-temperature gas inlet for desorption, and the gas outlet pipe (109) becomes the desorption crude gas outlet. The saturated desulfurizing agent recovers its adsorption capacity after high-temperature desorption.

3. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 2, characterized in that: After the desulfurizing agent has been running for a long time and has completely failed and can no longer be desorbed and utilized, it is necessary to replace the desulfurizing agent. At this time, the top plate (201) of the upper tower body is removed, and then the airflow distributor (202) of the upper tower and the top plate (105) of the lower tower body are removed in sequence. The packing device (107) inside the lower tower body (1) is lifted out and replaced, and then the packing device (107) inside the upper tower body (2) is lifted out and replaced.

4. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 1, characterized in that: The lower tower body (1) is provided with a lower tower steel plate inner wall (102) on the outer ring, a lower tower concrete outer wall (101) is provided on the outer ring of the lower tower steel plate inner wall (102), a lower tower arc-shaped bottom plate (103) is provided at the lower part of the lower tower steel plate inner wall (102), and a lower tower top plate (105) is provided at the upper part of the lower tower steel plate inner wall (102). A central column (104) is provided at the center of the lower tower body (1), and an upper tower body (2) is provided at the top of the lower tower body (1). The interior of both the lower tower body (1) and the upper tower body (2) is filled with a tower packing device (107), and an upper tower body top plate (201) is provided at the top of the upper tower body (2). The bottom sides of the lower tower body (1) and the upper tower body (2) are respectively connected to the gas inlet pipe (108), and the upper sides of the lower tower body (1) and the upper tower body (2) are respectively connected to the gas outlet pipe (109).

5. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 4, characterized in that: A compensating material layer (110) is filled between the inner wall (102) of the lower tower steel plate and the outer wall (101) of the lower tower concrete.

6. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 4, characterized in that: The lower tower arc-shaped bottom plate (103) is welded to the inner wall (102) of the lower tower steel plate. The lower tower arc-shaped bottom plate (103) is arc-shaped to facilitate drainage. Several lower drainage outlets (106) are opened on the surface of the arc-shaped bottom plate (3).

7. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 4, characterized in that: The lower tower top plate (105) is assembled from several sector plates. Each sector plate can be disassembled to facilitate the periodic hoisting and replacement of the packing device (107) inside the tower.

8. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 4, characterized in that: The tower packing device (107) is used to fill the desulfurizing agent.

9. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 4, characterized in that: The gas inlet pipe (108) is connected in sequence to an upper tower airflow distributor (202) and a lower tower airflow distributor (111). The lower tower airflow distributor (111) extends into the lower tower body (1). The upper tower airflow distributor (202) extends into the upper tower body (2). The upper tower airflow distributor (202) and the gas inlet pipe (108) are detachably assembled.

10. The working method of a semi-buried blast furnace gas desulfurization tower according to claim 4, characterized in that: The lower tower body (1) is located underground, and the upper tower body (2) is located on the ground.

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