A desulfurization tower

Abstract

The present invention relates to the technical field of wet oxidation desulfurization, and in particular to a desulfurization tower. It comprises a tower body, wherein a coal gas outlet is arranged at the top of the tower body, and a coal gas inlet extends into the interior from the side wall of the tower body or the top of the tower body, vertically downward; a mist catching filler, a filler and a gas distribution filler are arranged in sequence from top to bottom inside the tower body; a circulating desulfurization liquid inlet, a circulating desulfurization liquid outlet and a desulfurization liquid outlet are arranged at the bottom of the tower body, and the circulating desulfurization liquid inlet is located at the bottom of the coal gas inlet. The present invention has good desulfurization effect, reduces hydrogen sulfide content, reduces the number of high-sulfur coal gas desulfurization towers or filler height, and reduces the investment in equipment related to desulfurization liquid regeneration.

Description

Technical Field

[0001] The invention relates to the technical field of wet oxidation desulfurization, in particular to a desulfurization tower. Background Art

[0002] Wet oxidation desulfurization technology is one of the desulfurization methods widely used in the domestic chemical industry. As the name suggests, it uses alkaline solution to absorb H2S in the gas phase, and elemental sulfur is precipitated in the liquid phase that absorbs H2S due to the action of the oxidation catalyst. Therefore, this technology includes H2S absorption and oxidation.

[0003] With the development of the coking industry, large-scale coke ovens and high-sulfur coal coking have become a development trend, and the supporting gas facilities have become large-scale. The existing wet oxidation desulfurization tower has the problem of uneven distribution of gas in the coal gas inlet, which affects the desulfurization effect; and the increase in hydrogen sulfide content in the coal gas requires an increase in the processing capacity of the desulfurization tower, resulting in increased investment. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a desulfurization tower with good desulfurization effect, reduced hydrogen sulfide content, reduced number of high-sulfur coal gas desulfurization towers or packing height, and reduced investment in desulfurization liquid regeneration related equipment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A desulfurization tower comprises a tower body, wherein a gas outlet is arranged at the top of the tower body, and a gas inlet extends into the interior from the side wall or the top of the tower body vertically downward; mist catching fillers, fillers and gas distribution fillers are arranged in sequence from top to bottom inside the tower body; a circulating desulfurization liquid inlet, a circulating desulfurization liquid outlet and a desulfurization liquid outlet are arranged at the lower part of the tower body, and the circulating desulfurization liquid inlet is located at the bottom of the gas inlet.

[0007] It also includes manholes, and a plurality of manholes are fixedly connected to the side wall of the tower body.

[0008] It also includes a mist capture filler support, a filler support and a gas distribution filler support; the mist capture filler support is fixedly connected to the inner wall of the tower body to support the mist capture filler; the filler support is fixedly connected to the inner wall of the tower body to support the filler; the gas distribution filler support is fixedly connected to the inner wall of the tower body to support the gas distribution filler and the gas inlet.

[0009] It also includes a mist-catching filler cleaning liquid interface, which is fixedly connected to the tower body and is located above the mist-catching filler.

[0010] A large-hole nozzle is provided at the inlet end of the circulating desulfurization liquid.

[0011] A swirl plate device is provided at the end of the coal gas inlet.

[0012] A circulating desulfurization liquid pump is provided on the pipeline connecting the circulating desulfurization liquid inlet and the circulating desulfurization liquid outlet.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The circulating desulfurization liquid inlet of the present invention is located at the bottom of the coal gas inlet, and the coal gas and the desulfurization liquid are sprayed in the opposite direction at the inlet to achieve the effect of preliminary desulfurization. The swirl plate device at the end of the coal gas inlet performs a secondary reaction on the preliminary desulfurized coal gas and the desulfurization liquid to enhance the desulfurization effect. At the same time, the external swirl plate distributes the coal gas evenly in the circumferential direction, changes the downward direction of the airflow, and the airflow does not affect the lower desulfurization liquid level. The hydrogen sulfide content of the coal gas after preliminary desulfurization is reduced, which reduces the number of high-sulfur coal gas desulfurization towers or the height of the packing, and reduces the investment in equipment related to the regeneration of the desulfurization liquid.

[0015] 2. A large-hole nozzle is provided at the inlet end of the circulating desulfurization liquid of the present invention. The circulating desulfurization liquid contains large-particle impurities such as sulfur and salts. The large-hole nozzle is used to ensure that the equipment is not blocked during the spraying process of the circulating desulfurization liquid.

[0016] 3. The present invention is provided with a gas distribution filler, and the coal gas passing through the gas distribution filler flows upward uniformly, meeting the mass transfer requirements of a large-scale coal gas desulfurization tower and ensuring the desulfurization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] In the figure: 1-tower body; 2-desulfurization liquid outlet; 3-manhole; 4-gas inlet; 5-gas outlet; 6-mist catcher filler cleaning liquid interface; 7-mist catcher filler; 8-mist catcher filler support; 9-desulfurization liquid inlet; 10-filler; 11-filler support; 12-gas distribution filler; 13-gas distribution filler support; 14-swirl plate device; 15-circulating desulfurization liquid inlet; 16-circulating desulfurization liquid outlet; 17-circulating desulfurization liquid pump. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0020] like Figure 1 As shown, a desulfurization tower includes a tower body 1, and a gas outlet 5 is provided at the top of the tower body 1. The gas inlet 4 is L-shaped, and the horizontal section of the gas inlet 4 extends from the side wall of the tower body into the interior thereof, and the vertical section of the gas inlet 4 is located on the axis of the tower body 1. A swirl plate device 14 is provided at the end of the gas inlet 4, and the swirl plate device 14 adopts an external swirl plate.

[0021] Four manholes 3 are provided on the side wall of the tower body, three of which are located above the gas inlet 4, and one of which is located below the gas inlet 4. A circulating desulfurization liquid inlet 15, a circulating desulfurization liquid outlet 16 and a desulfurization liquid outlet 2 are provided at the lower part of the side wall of the tower body, and the circulating desulfurization liquid inlet 15 is located at the bottom of the gas inlet 4. The circulating desulfurization liquid inlet 15 and the gas inlet 4 constitute a primary desulfurization device.

[0022] A circulating desulfurization liquid pump 17 is provided on the pipeline connecting the circulating desulfurization liquid inlet 15 and the circulating desulfurization liquid outlet 16. A large-hole nozzle is provided at the end of the circulating desulfurization liquid inlet 15.

[0023] The tower body 1 is provided with mist-catching filler 7, filler 10 and gas distribution filler 12 in order from top to bottom, and also includes mist-catching filler support 8, filler support 11 and gas distribution filler support 13; the mist-catching filler support 8 is fixedly connected to the inner wall of the tower body to support the mist-catching filler 7; the filler support 11 is fixedly connected to the inner wall of the tower body to support the filler 10; the gas distribution filler support 13 is fixedly connected to the inner wall of the tower body to support the gas distribution filler 12 and the coal gas inlet 4. The gas distribution filler 12 is mainly used for uniform gas distribution and plays a role in gas-liquid mass transfer.

[0024] It also includes a mist-catching filler cleaning liquid interface 6 , which is fixedly connected to the upper part of the side wall of the tower body 1 and is located above the mist-catching filler 7 .

[0025] The working principle and working process of the present invention are:

[0026] The coal gas is introduced into the tower body 1 through the coal gas inlet 4, and the circulating desulfurization liquid from the bottom of the desulfurization tower is sent to the circulating desulfurization liquid inlet 15 by the circulating desulfurization liquid pump 17. The circulating desulfurization liquid sprayed from the large-hole nozzle contacts the coal gas in reverse direction, and the gas-liquid two-phases collide in reverse direction at high speed. When the momentum of the gas-liquid two-phases reaches equilibrium, a highly turbulent foam zone is formed with a large contact surface area, and these contact surfaces are constantly and rapidly renewed, thereby achieving the effect of efficient desulfurization.

[0027] The circulating desulfurization liquid contains large particle impurities such as sulfur and salts. Large-hole nozzles are used to ensure that the equipment is not blocked during the spraying of the circulating desulfurization liquid.

[0028] The swirl plate device 14 at the end of the gas inlet 4 performs secondary reaction on the initially desulfurized gas and the desulfurized liquid to enhance the desulfurization effect. At the same time, the external swirl plate evenly distributes the gas in the circumferential direction, changing the vertical downward direction of the airflow without affecting the lower desulfurized liquid level.

[0029] After the coal gas passes through the gas distribution packing 12 upward, the coal gas is evenly distributed upward. In the gas distribution packing layer, due to the downward desulfurization liquid, it also plays a role in gas-liquid mass transfer. In the packing layer, the coal gas contacts the desulfurization liquid regenerated in the regeneration tower in reverse direction, which plays a major role in mass transfer. The desulfurized coal gas passes through the mist capture packing 7 to remove the mist droplets in the coal gas and is sent to the subsequent process section for treatment.

[0030] The coal gas of the present invention is sprayed in the opposite direction to the desulfurization liquid at the inlet to achieve the effect of preliminary desulfurization. The swirl plate device 14 at the end of the coal gas inlet 4 performs a secondary reaction on the preliminary desulfurized coal gas and the desulfurization liquid to enhance the desulfurization effect. At the same time, the external swirl plate evenly distributes the coal gas in the circumferential direction to change the downward direction of the airflow, and the airflow does not affect the liquid level of the lower desulfurization liquid. The coal gas that has undergone preliminary desulfurization has a reduced hydrogen sulfide content, which reduces the number of high-sulfur coal gas desulfurization towers or the height of the packing, and reduces the investment in equipment related to the regeneration of the desulfurization liquid. The present invention is provided with a gas distribution filler 12, and the coal gas that has passed through the gas distribution filler flows evenly upward, meeting the mass transfer requirements of a large-scale coal gas desulfurization tower and ensuring the desulfurization effect.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A desulfurization process, characterized in that: The desulfurization tower used comprises a tower body, wherein a gas outlet is arranged at the top of the tower body, and a gas inlet extends into the tower body from the side wall or the top of the tower body, vertically downward; a mist catching filler, a filler and a gas distribution filler are arranged in sequence from top to bottom inside the tower body; a circulating desulfurization liquid inlet, a circulating desulfurization liquid outlet and a desulfurization liquid outlet are arranged at the lower part of the tower body, and the circulating desulfurization liquid inlet is located at the bottom of the gas inlet; The circulating desulfurization liquid inlet end is provided with a large-hole nozzle; The gas inlet end is provided with a swirl plate device; A circulating desulfurization liquid pump is provided on the pipeline connecting the circulating desulfurization liquid inlet and the circulating desulfurization liquid outlet; The details are as follows: The coal gas is introduced into the tower body from the coal gas inlet, and the circulating desulfurization liquid from the bottom of the desulfurization tower is pumped into the circulating desulfurization liquid inlet by the circulating desulfurization liquid pump. The circulating desulfurization liquid sprayed from the large-hole nozzle contacts the coal gas in reverse direction, achieving the effect of efficient desulfurization; The swirl plate device at the end of the gas inlet performs secondary reaction on the initially desulfurized gas and desulfurized liquid to enhance the desulfurization effect. At the same time, the external swirl plate evenly distributes the gas in the circumferential direction, changing the vertical downward direction of the airflow, and the airflow does not affect the level of the desulfurized liquid at the bottom; After passing through the gas distribution packing, the coal gas is evenly distributed upwards. In the gas distribution packing layer, due to the downward desulfurization liquid, it also plays a role in gas-liquid mass transfer. In the packing layer, the coal gas contacts the desulfurization liquid after regeneration in the regeneration tower in reverse, which plays a major role in mass transfer. The desulfurized coal gas passes through the mist collecting filler to remove the droplets in the coal gas and is sent to the subsequent process for treatment.

2. A desulfurization process according to claim 1, characterized in that: It also includes manholes, and a plurality of manholes are fixedly connected to the side wall of the tower body.

3. A desulfurization process according to claim 1, characterized in that: It also includes a mist capture filler support, a filler support and a gas distribution filler support; the mist capture filler support is fixedly connected to the inner wall of the tower body to support the mist capture filler; the filler support is fixedly connected to the inner wall of the tower body to support the filler; the gas distribution filler support is fixedly connected to the inner wall of the tower body to support the gas distribution filler and the gas inlet.

4. A desulfurization process according to claim 1, characterized in that: It also includes a mist-catching filler cleaning liquid interface, which is fixedly connected to the tower body and is located above the mist-catching filler.

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