A kind of intermediate cooling washing naphthalene tower

Abstract

The present invention relates to the technical field of naphthalene washing towers, and in particular to an intermediate cooling naphthalene washing tower. The tower body comprises a tower body, which is arranged vertically, and a gas distribution device, a liquid cut-off plate, a gas oil removal device, a gas distribution filler and a gas mist catching filler are arranged in sequence from bottom to top in the tower body; a gas inlet, an oil washing inlet, a circulating ammonia water inlet, a circulating ammonia water outlet, and a cleaning liquid inlet are fixedly connected to the side wall of the tower body; a gas outlet is fixedly connected to the top of the tower body, and an oil washing outlet is fixedly connected to the bottom of the tower body. The present invention is conducive to the uniform distribution of naphthalene-containing gas, while reducing naphthalene blockage, reducing corrosion in subsequent processes, having high oil removal efficiency, and reducing oil washing loss.

Description

Technical Field

[0001] The invention relates to the technical field of naphthalene washing towers, in particular to a mid-cooling naphthalene washing tower. Background Art

[0002] Raw gas contains impurities such as naphthalene, hydrogen sulfide, hydrogen cyanide, ammonia, and tar. The coke oven gas purification process is to remove the above impurities to obtain clean gas. During the purification process, most of the naphthalene is dissolved in the tar, but the naphthalene in a saturated state will be deposited and cause blockage due to the reduction of flow rate or temperature drop, so it is necessary to reduce the naphthalene content in the gas.

[0003] The existing naphthalene washing tower naphthalene removal process uses precooling of unsaturated coal gas to reduce the gas temperature. The unsaturated coal gas becomes saturated coal gas and further enters the oil-washing naphthalene section. The washing oil is used to absorb the naphthalene in the coal gas. The coal gas then enters the cooling section. After cooling, the coal gas enters the subsequent purification process. When the saturated coal gas enters the oil-washing naphthalene section, the water content in the washing oil increases, and impurities such as hydrogen sulfide and hydrogen cyanide are easily dissolved in the water-containing washing oil, causing serious corrosion in the subsequent processes. At the same time, the gas distribution and demisting device of the existing naphthalene washing tower affect the naphthalene removal effect. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an intermediate cooling naphthalene washing tower, which is beneficial to the uniform distribution of naphthalene-containing gas, while reducing naphthalene blockage, reducing corrosion in subsequent processes, having high oil removal efficiency, and reducing washing oil loss.

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

[0006] A mid-cooling naphthalene washing tower comprises a tower body, which is arranged vertically. A gas distribution device, a liquid cut-off plate, a coal gas oil removal device, a coal gas distribution filler and a coal gas mist catching filler are arranged in sequence from bottom to top in the tower body; a coal gas inlet, an oil washing inlet, a circulating ammonia water inlet, a circulating ammonia water outlet and a cleaning liquid inlet are fixedly connected to the side wall of the tower body; a coal gas outlet is fixedly connected to the top of the tower body, and a washing oil outlet is fixedly connected to the bottom of the tower body.

[0007] The gas distribution device comprises an arc plate, a support ring and a support beam; the support ring is fixed on the inner wall of the tower body side wall, the support beam is fixed on the support ring, and the arc plate is fixed on the support beam and the support ring.

[0008] The wash oil inlet extends into the tower body, and an atomizing nozzle is arranged at the end.

[0009] The coal gas oil removal device comprises a swirl plate, a cylinder, a ring plate, an annular wire mesh, a cone top, an inner cylinder, a drain pipe and a guide plate; the bottom of the cylinder passes through the liquid cut-off plate and extends to the bottom of the liquid cut-off plate, the inner cylinder is fixedly connected to the upper part of the cylinder through the ring plate, the cylinder, the inner cylinder and the ring plate form an annular groove, the annular wire mesh is placed in the annular groove, and the annular groove is provided with a drain pipe; the swirl plate is fixedly connected to the liquid cut-off plate, the guide plate is fixedly connected to the inner wall of the cylinder, and the guide plate spirally rises along the inner wall of the cylinder.

[0010] The top of the cylinder is flush with the top of the inner cylinder, and the cone top is fixedly connected to the cylinder and the top of the inner cylinder.

[0011] The gas distribution filler is a random filler or a structured filler.

[0012] The circulating ammonia water inlet extends into the tower body, and an atomizing nozzle is arranged at the end.

[0013] It also includes a gas distribution filler support, which is fixed to the inner wall of the tower body side wall to support the gas distribution filler.

[0014] It also includes a gas mist catcher filler support, which is fixedly connected to the inner wall of the tower body side wall to support the gas mist catcher filler.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The gas distribution device of the present invention is conducive to the uniform distribution of naphthalene-containing gas and reduces naphthalene blockage.

[0017] 2. The unsaturated coal gas of the present invention enters the oil-washing naphthalene section, which reduces the water content in the washing oil and reduces corrosion in subsequent processes.

[0018] 3. The gas deoiling device of the present invention adopts a two-stage deoiling method of a cyclone plate and a wire mesh, which has high deoiling efficiency and reduces oil washing loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic front view of the structure of the present invention;

[0020] Figure 2 It is a schematic front view of the structure of the gas distribution device of the present invention;

[0021] Figure 3 A schematic top view of the structure of the gas distribution device of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the coal gas oil removal device of the present invention.

[0023] In the figure: 1-tower body 2-gas inlet 3-gas distribution device 4-manhole 5-liquid cut-off plate 6-gas oil removal device 7-gas distribution filler support 8-gas distribution filler 9-gas mist capture filler support 10-gas mist capture filler 11-gas outlet 12-end 13-cleaning liquid inlet 14-circulating ammonia water inlet 15-circulating ammonia water outlet 16-wash oil inlet 17-wash oil outlet 31-arc plate 32-support ring 33-support beam 60-swirl plate 61-cylinder 62-ring plate 63-annular wire mesh 64-support plate 65-cone top 66-inner cylinder 67-drain pipe 68-guide plate DETAILED DESCRIPTION

[0024] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0025] like Figure 1-4 As shown, an intermediate cooling naphthalene washing tower includes a tower body 1, a gas inlet 2, a gas distribution device 3, a manhole 4, a liquid cut-off plate 5, a gas oil removal device 6, a gas distribution filler support 7, a gas distribution filler 8, a gas mist catcher filler support 9, a gas mist catcher filler 10, a gas outlet 11, a head 12, a cleaning liquid inlet 13, a circulating ammonia water inlet 14, a circulating ammonia water outlet 15, a washing oil inlet 16 and a washing oil outlet 17.

[0026] The tower body 1 is arranged vertically, and the tower body of the tower body 1 is cylindrical, and the top and bottom are provided with heads 12. The wash oil outlet 17 is L-shaped, and its vertical pipe is fixedly connected to the bottom center of the tower body 1, and the end of the horizontal pipe is provided with a flange.

[0027] The gas inlet 2 is fixedly connected to the side wall of the tower body 1 and is located at the lower part of the side wall.

[0028] The gas distribution device 3 is fixed inside the tower body 1 and is located above the gas inlet 2. The gas distribution device 3 includes an arc plate 31, a support ring 32 and a support beam 33; the support ring 32 is fixed to the inner wall of the side wall of the tower body 1, the support beam 33 is fixed to the support ring 32, the arc plate 31 is fixed to the support beam 33, and the end portion is fixed to the support ring 32.

[0029] The wash oil inlet 16 is fixedly connected to the side wall of the tower body 1 and is located above the gas distribution device 3. The wash oil inlet 16 extends into the center of the tower body 1 and is provided with an atomizing nozzle at the end to spray the wash oil.

[0030] The liquid cut-off tray 5 is fixedly connected to the tower body 1 and is located above the wash oil inlet 16. The circulating ammonia water outlet 15 is an L-shaped pipe. The vertical pipe is connected to the liquid cut-off tray 5, and the horizontal pipe is fixedly connected to the side wall of the tower body 1. The circulating ammonia water outlet 15 is located between the liquid cut-off tray 5 and the wash oil inlet 16. A drain pipe 67 is provided at the bottom of the liquid cut-off tray 5.

[0031] There are four manholes 4 in total, all of which are fixedly connected to the side wall of the tower body 1. The first manhole 4 is located between the gas distribution device 3 and the liquid cut-off plate 5, the second manhole 4 is located between the gas distribution filler support 7 and the liquid cut-off plate 5, the third manhole 4 is located between the gas mist catcher filler 10 and the gas distribution filler 8, and the fourth manhole 4 is located above the gas mist catcher filler 10.

[0032] The coal gas oil removal device 6 comprises a swirl plate 60 , a cylinder 61 , a ring plate 62 , an annular screen 63 , a support plate 64 , a cone top 65 , an inner cylinder 66 , a drain pipe 67 and a guide plate 68 .

[0033] The cylinder 61 passes through the liquid cut-off plate 5 and extends to the bottom of the liquid cut-off plate 5. The ring plate 62 is fixedly connected to the inner wall of the cylinder 61. The inner cylinder 66 is fixedly connected to the ring plate 62. The cylinder 61, the inner cylinder 66 and the ring plate 62 form an annular groove. The annular wire mesh 63 is placed in the annular groove. The bottom of the annular groove is provided with a drain pipe 67. The swirl plate 60 is fixedly connected to the liquid cut-off plate 5. The guide plate 68 is fixedly connected to the inner wall of the cylinder 61. The guide plate 68 spirally rises along the inner wall of the cylinder 61.

[0034] The top of the cylinder 61 is flush with the top of the inner cylinder 66, and the cone top 65 is fixedly connected to the top of the cylinder 61 and the inner cylinder 66. The support plate 64 is fixedly connected to the outer wall of the cylinder 61 and connected to the cone top 65 to play a supporting role.

[0035] The gas distribution packing support 7 is fixedly connected to the inner wall of the side wall of the tower body 1, supports the gas distribution packing 8, and is located above the gas deoiling device 6. The gas distribution packing 8 is a random packing or a structured packing.

[0036] The gas mist catching filler support 9 is fixedly connected to the inner wall of the side wall of the tower body 1 , supports the gas mist catching filler 10 , and is located above the gas distribution filler 8 .

[0037] The circulating ammonia water inlet 14 is fixedly connected to the side wall of the tower body 1 and is located between the gas mist capture filler support 9 and the gas distribution filler 8. The circulating ammonia water inlet 14 extends into the center of the tower body 1 and is provided with an atomizing nozzle at the end to spray ammonia water.

[0038] The cleaning liquid inlet 13 is fixedly connected to the side wall of the tower body 1 and is located above the gas mist catching filler 10. The cleaning liquid inlet 13 extends into the center of the tower body 1 and a nozzle is provided at the end.

[0039] The gas outlet 11 is fixedly connected to the top cover 12 and is located at the center.

[0040] The coal gas enters the tower from the lower part of the tower body 1, passes through the arc plate 31 of the gas distribution device 3, and through the homogenization of the airflow, the airflow is evenly distributed after passing through the gas distribution device 3, and fully reacts with the washing oil after atomization in the upper part to wash the naphthalene in the coal gas. The gas distribution device 3 has a large gap and is not easily blocked by naphthalene. Due to the gradually shrinking and expanding arc structure, the washing oil and the coal gas form a strong gas-liquid two-phase turbulence. The coal gas passes through the arc plate 31 at a high speed, flushing the naphthalene on the arc plate 31, reducing scaling, and at the same time, in the gas distribution device 3, it also plays a role in the washing oil absorbing naphthalene. The unsaturated coal gas enters the oil-washing naphthalene section, reducing the moisture in the washing oil and reducing corrosion in subsequent processes. The coal gas without naphthalene passes through the swirl plate 60 of the coal gas de-oiling device 6, rotates along the guide plate 68 in the cylinder 61, and enters the vertically placed annular wire mesh 63 demisting device. The rotation generates centrifugal force to improve the demisting effect. At the same time, the upper resistance of the wire mesh is smaller than the lower resistance. The airflow passes through the upper wire mesh, and the washing oil flows downward along the wire mesh and is discharged through the drain pipe 67. The coal gas without naphthalene is evenly distributed through the coal gas distribution filler 8, and then washed with ammonia water to reduce the coal gas temperature. At the same time, the distribution filler also plays a mass transfer role. The coal gas passes through the coal gas mist catching filler 10 again to remove the mist droplets in the coal gas, and the subsequent process operation is carried out.

[0041] The invention is beneficial to the uniform distribution of naphthalene-containing gas, and at the same time reduces naphthalene blockage, reduces corrosion in subsequent processes, has high oil removal efficiency, and reduces washing oil loss.

[0042] 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 medium cooling naphthalene washing tower, characterized in that: It comprises a tower body, which is arranged vertically, and a gas distribution device, a liquid cut-off plate, a gas oil removal device, a gas distribution filler and a gas mist catching filler are arranged in sequence from bottom to top in the tower body; a gas inlet, an oil washing inlet, a circulating ammonia water inlet, a circulating ammonia water outlet and a cleaning liquid inlet are fixedly connected to the side wall of the tower body; a gas outlet is fixedly connected to the top of the tower body, and an oil washing outlet is fixedly connected to the bottom of the tower body; The gas distribution device comprises an arc plate, a support ring and a support beam; the support ring is fixed on the inner wall of the tower body side wall, the support beam is fixed on the support ring, and the arc plate is fixed on the support beam and the support ring; due to the gradually shrinking and expanding arc structure, the wash oil and coal gas form a strong gas-liquid two-phase turbulence; The coal gas oil removal device comprises a swirl plate, a cylinder, a ring plate, an annular wire mesh, a cone top, an inner cylinder, a liquid discharge pipe and a guide plate; the bottom of the cylinder passes through the liquid cut-off plate and extends to the bottom of the liquid cut-off plate, the inner cylinder is fixedly connected to the upper part of the cylinder through the ring plate, the cylinder, the inner cylinder and the ring plate form an annular groove, the annular wire mesh is placed in the annular groove, and the annular groove is provided with a liquid discharge pipe; the swirl plate is fixedly connected to the liquid cut-off plate, the guide plate is fixedly connected to the inner wall of the cylinder, and the guide plate spirally rises along the inner wall of the cylinder; The top of the cylinder is flush with the top of the inner cylinder, and the cone top is fixedly connected to the cylinder and the top of the inner cylinder.

2. A medium cold washing naphthalene tower according to claim 1, characterized in that: The wash oil inlet extends into the tower body, and an atomizing nozzle is arranged at the end.

3. A medium cooling and washing naphthalene tower according to claim 1, characterized in that: The gas distribution filler is a random filler or a structured filler.

4. A medium cooling and washing naphthalene tower according to claim 1, characterized in that: The circulating ammonia water inlet extends into the tower body, and an atomizing nozzle is arranged at the end.

5. A medium cooling and washing naphthalene tower according to claim 1, characterized in that: It also includes a gas distribution filler support, which is fixed to the inner wall of the tower body side wall to support the gas distribution filler.

6. A medium cooling and washing naphthalene tower according to claim 1, characterized in that: It also includes a gas mist catcher filler support, which is fixedly connected to the inner wall of the tower body side wall to support the gas mist catcher filler.

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