Alkali washing device for treating low-acid component gas

Abstract

The utility model provides an alkali washing device for treating gas with low acidic components, which comprises an alkali washing tank, alkali liquor for neutralizing acidic components is accommodated in the alkali washing tank, a gas outlet is arranged at the top of the alkali washing tank, and a gas inlet is arranged above the liquid level of the alkali liquor; the gas inlet is connected with an anti-suck-back gas distributor inside the alkali washing tank through a gas inlet short pipe, and the anti-suck-back gas distributor is partially immersed below the liquid level of the alkali liquor. The device disclosed by the utility model has the beneficial effects that a mode that low-acid component gas is directly contacted with alkali liquor through the anti-suck-back gas distributor to remove acid components and then is discharged to the atmosphere is adopted to replace a mode that the alkali liquor is circularly sprayed by a pump.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment in petrochemical industry, in particular to an alkali washing device for treating low-acid component gas. Background Art

[0002] In the fields of natural gas, biogas, coal chemical industry, etc., many refining and chemical plants will produce low-acid component gases, such as low-grade water vapor, biogas escape gas, molten sulfur flash steam, etc. These gases are characterized by containing very small amounts of acidic components, such as hydrogen sulfide, organic sulfur, sulfur dioxide, etc., and because they contain a large amount of water vapor and have low utilization value, they are not suitable for dry absorption and are generally treated by alkaline washing.

[0003] At present, most alkali cleaning devices adopt the method of pump circulation spraying. For example, the Chinese invention patent with publication number CN107983105A discloses an acid gas dust removal and purification device, which includes an alkali liquid preparation box, a treatment box, a purification box and a dust hopper; the baffle is obliquely arranged on both sides of the inner cavity of the treatment box and arranged on the top of the filter device; the alkali liquid preparation box is arranged on the right side of the treatment box; the agitator is arranged in the inner cavity of the alkali liquid preparation box; the secondary filter plate is arranged on the upper side of the inner cavity of the treatment box and arranged between the first spray pipe and the second spray pipe; the lower end of the exhaust fan is connected to the purification box through an exhaust pipe. The invention device connects the right end of the infusion pump to the first spray pipe and the second spray pipe respectively through the infusion pipe, and has the function of uniformly spraying alkali liquid for neutralization reaction and dust removal. However, these alkali cleaning devices all require pumps for circulation operation, and have the disadvantages of high investment and operation costs, difficult to control the concentration of the alkali solution, and the need for manual intervention.

[0004] Therefore, it is necessary to study an alkali washing device for treating low-acid component gas to solve the above problems or alleviate the impact of the above problems. Utility Model Content

[0005] The utility model provides an alkali washing device for treating low-acid component gas, which adopts a method in which the low-acid component gas directly contacts alkali liquid through an anti-backflow gas distributor to remove the acidic components and then discharges into the atmosphere, instead of a method in which a pump circulates and sprays alkali liquid.

[0006] The utility model discloses an alkali washing device for treating low-acid component gas, comprising an alkali washing tank, wherein the alkali washing tank contains alkali solution for neutralizing acid components, the alkali washing tank is provided with a gas outlet at the top, and a gas inlet is provided above the liquid level of the alkali solution; the gas inlet is connected to an anti-backflow gas distributor inside the alkali washing tank through an air inlet short pipe, and the anti-backflow gas distributor is partially submerged below the liquid level of the alkali solution, the anti-backflow gas distributor can directly contact the low-acid component gas introduced from the gas inlet with the alkali solution, and can prevent the alkali solution from being backflowed into the air inlet short pipe.

[0007] In one embodiment, the anti-backflow gas distributor is a truncated cone-shaped structure, the top of which is connected to the air inlet short pipe, and the bottom is provided with evenly distributed air holes.

[0008] In one embodiment, the angle between the truncated cone slope of the anti-backflow gas distributor and its bottom plane is 30-50°, and the height of the anti-backflow gas distributor submerged below the alkali solution surface is 1 / 10-1 / 3 of its own height.

[0009] In one embodiment, the alkali washing device further comprises an exhaust chimney connected to the gas outlet, the exhaust chimney is vertically erected, and the height of the exhaust chimney is greater than 15m.

[0010] In one embodiment, a rain cap and a splash guard are provided at the top of the exhaust chimney. The rain cap is located inside the splash guard. The rain cap is used to block the alkali liquid directly splashed out from the exhaust chimney, and the splash guard is used to collect the splashed alkali liquid.

[0011] In one embodiment, the rain cap is located below 1 / 3 of the height of the splash guard, a drainage outlet is provided at the bottom of the splash guard, and the drainage outlet is connected to the waste liquid pipeline through a first pipeline.

[0012] In one embodiment, the alkali washing device also includes an alkali liquid storage tank, which is located at a position higher than the installation position of the alkali washing tank. The alkali liquid storage tank is connected to the alkali washing tank through a second pipe, and the alkali liquid storage tank can replenish the alkali washing tank with the alkali liquid in a gravity flow manner; the second pipe is provided with a first switch valve for controlling the connection of the second pipe.

[0013] In one embodiment, a waste liquid outlet is provided at the bottom of the alkali washing tank, and the waste liquid outlet is connected to a waste liquid pipeline via a second switch valve, and the second switch valve controls the discharge of the waste liquid.

[0014] In one embodiment, the alkali washing tank is provided with a liquid level meter and an alkali solution concentration detector, and both the liquid level meter and the alkali solution concentration detector are linked with the first switch valve and the second switch valve for control.

[0015] In one embodiment, an inverted U-shaped tube is provided on one side of the alkali washing tank, one end of the inverted U-shaped tube is connected to the alkali washing tank, and the other end is connected to the waste liquid pipeline, and the top of the inverted U-shaped tube is at the same level as the liquid level of the alkali solution in the alkali washing tank.

[0016] The utility model provides an alkali washing device for treating low-acid component gas, which has at least the following beneficial effects compared with the prior art:

[0017] The utility model uses an alkali washing device for treating low-acid component gas to directly contact alkali liquid through an anti-backflow gas distributor to remove acidic components and then discharge into the atmosphere, instead of using a pump to circulate and spray alkali liquid. This eliminates the need for a pump, reduces initial equipment investment, and reduces daily operating costs. In addition, the anti-backflow gas distributor can prevent alkali liquid from being backflowed into the gas production device, making it safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of an alkali washing device according to an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the bottom of the anti-backflow gas distributor of the embodiment of the utility model.

[0021] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0022] Reference numerals:

[0023] 1-alkaline washing tank, 2-gas outlet, 3-gas inlet, 4-air inlet short pipe, 5-anti-backflow gas distributor, 6-air hole, 7-exhaust pipe, 8-rain cap, 9-splash-proof cylinder, 10-first pipeline, 11-waste liquid pipeline, 12-alkaline liquid storage tank, 13-second pipeline, 14-first switch valve, 15-second switch valve, 16-liquid level meter, 17-alkaline liquid concentration detector, 18-inverted U-shaped tube. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1As shown, the utility model of the alkali washing device for treating low-acid component gas includes an alkali washing tank 1, which contains alkali solution for neutralizing acidic components. The alkali washing tank 1 is provided with a gas outlet 2 at the top, and a gas inlet 3 is provided above the liquid level of the alkali solution; the gas inlet 3 is connected to the anti-backflow gas distributor 5 inside the alkali washing tank 1 through an air inlet short pipe 4, and the anti-backflow gas distributor 5 is partially submerged below the liquid level of the alkali solution. The anti-backflow gas distributor 5 can directly contact the low-acid component gas introduced from the gas inlet 3 with the alkali solution, and at the same time can prevent the alkali solution from being back-sucked into the air inlet short pipe 4.

[0026] Specifically, the alkali washing tank 1 can accommodate alkali liquid and provide a reaction space for the acidic substances of the alkali liquid to neutralize the low-acid component gas. The position of the gas inlet 3 is higher than the liquid level of the alkali liquid, so that the alkali liquid can be prevented from being sucked back into the gas production device in combination with the air inlet short pipe 4 and the anti-backflow gas distributor 5. The specific processing process is to allow the low-acid component gas to first enter the air inlet short pipe 4 through the gas inlet 3, and then enter the alkali liquid through the anti-backflow gas distributor 5, so that the low-acid component gas is fully in contact with the alkali liquid and reacts to remove the acidic component by neutralization, and the gas with the acidic component removed is finally discharged into the atmosphere through the gas outlet 2. The alkali liquid can generally be selected according to the actual situation of the acidic component, for example, potassium hydroxide or sodium hydroxide can be selected.

[0027] In general, the alkali washing device uses a method in which the low-acid component gas directly contacts the alkali solution through the anti-backflow gas distributor 5 to remove the acidic components and then discharges them into the atmosphere, instead of using a pump to circulate and spray the alkali solution. This method does not require a pump, can reduce initial equipment investment, and reduce daily operating costs. In addition, the anti-backflow gas distributor 5 can prevent the alkali solution from being backflowed into the gas production device, which is safer and more reliable.

[0028] In an example, Figure 1 and Figure 2 As shown, the anti-backflow gas distributor 5 is a truncated cone structure, the top of which is connected to the air inlet short pipe 4, and the bottom is provided with evenly distributed air holes 6.

[0029] Specifically, the bottom of the anti-backflow gas distributor 5 is submerged below the alkali liquid surface, and the low-acid component gas is introduced into the alkali liquid through the evenly distributed air holes 6, so that the low-acid component gas can be in direct contact with the alkali liquid. The anti-backflow gas distributor 5 is a truncated cone-shaped structure that gradually increases from top to bottom. When the alkali liquid is backflowed by the short air inlet pipe 4, it is difficult to be sucked into the gas production device due to the influence of the truncated cone slope and the dead weight of the alkali liquid, so as to achieve the function of preventing the backflow of the alkali liquid.

[0030] In one example, the angle between the truncated cone slope of the anti-backflow gas distributor 5 and its bottom plane is 30 to 50°, for example, it can be 30°, 35°, 40°, 45°, 50°, etc.; the height of the anti-backflow gas distributor 5 submerged below the liquid level of the alkali solution is 1 / 10 to 1 / 3 of its own height, for example, it can be 1 / 10, 1 / 8, 1 / 6, 1 / 4, 1 / 3, etc.

[0031] Furthermore, the angle between the truncated cone slope of the anti-backflow gas distributor 5 and the bottom plane thereof is 45°, and the height of the anti-backflow gas distributor 5 submerged below the liquid surface of the alkali solution is 1 / 8 of its own height.

[0032] In an example, Figure 1 As shown, the alkali washing device also includes an exhaust pipe 7 connected to the gas outlet 2, the exhaust pipe 7 is vertically set up, and the height of the exhaust pipe 7 is greater than 15m. Such an arrangement of the exhaust pipe 7 can discharge the gas after alkali washing at a higher position, reduce the impact of the discharged gas on the surrounding environment, and prevent the alkali liquid from splashing out to a certain extent.

[0033] In an example, Figure 1 As shown, a rain cap 8 and a splash guard 9 are provided at the top of the exhaust pipe 7. The rain cap 8 is located inside the splash guard 9. The rain cap 8 is used to block the alkali liquid splashing directly from the exhaust pipe 7, and the splash guard 9 is used to collect the splashed alkali liquid.

[0034] Specifically, the splash-proof tube 9 is a cylindrical structure with its opening facing upward, and its bottom is sleeved on the top of the exhaust tube 7. The rain cap 8 is umbrella-shaped and blocks the top outlet end of the exhaust tube 7, so that the rain cap 8 can block the alkali liquid directly splashed out from the exhaust tube 7 and prevent the alkali liquid from splashing into the external environment, while the splash-proof tube 9 can collect the splashed alkali liquid.

[0035] In one example, the rain cap 8 is located below 1 / 3 of the height of the splash guard 9 , a drainage outlet is provided at the bottom of the splash guard 9 , and the drainage outlet is connected to the waste liquid pipeline 11 through the first pipeline 10 .

[0036] Specifically, the portion of the top of the splash-proof tube 9 that is higher than the rain cap 8 accounts for more than 2 / 3 of its overall height, which can further prevent the alkali liquid from splashing out to the external environment. The alkali liquid splashing out of the exhaust tube 7 is shielded and protected by the rain cap 8 and falls into the splash-proof tube 9, and then can be discharged through the drainage outlet at the bottom of the splash-proof tube 9 and flow into the waste liquid pipeline 11 through the first pipeline 10.

[0037] In an example, Figure 1As shown, the alkali washing device also includes an alkali liquid storage tank 12, which is located at a position higher than the installation position of the alkali washing tank 1. The alkali liquid storage tank 12 is connected to the alkali washing tank 1 through a second pipe 13, and the alkali liquid storage tank 12 can replenish alkali liquid to the alkali washing tank 1 in a gravity manner; the second pipe 13 is provided with a first switch valve 14 for controlling the connection of the second pipe 13.

[0038] Specifically, since the installation position of the alkali liquid storage tank 12 is higher than the installation position of the alkali washing tank 1, and the alkali liquid storage tank 12 is connected to the alkali washing tank 1 by a second pipe 13, that is, there is a height difference between the liquid level of the alkali liquid storage tank 12 and the liquid level of the alkali washing tank 1, a pressure difference is formed based on the gravity potential energy of the alkali liquid, so that the alkali liquid in the alkali liquid storage tank 12 can flow into the alkali washing tank 1 by gravity, without the need for a pump to supply energy. The first switch valve 14 on the second pipe 13 can control the alkali liquid storage tank 12 to replenish the alkali washing tank 1 with alkali liquid.

[0039] Further, the bottom position of the alkali liquid storage tank 12 is higher than the top position of the alkali washing tank 1. One end of the second pipeline 13 is connected to the bottom of the alkali liquid storage tank 12, and the other end is connected to the middle of the alkali washing tank 1.

[0040] In one example, a waste liquid outlet is provided at the bottom of the alkali cleaning tank 1, and the waste liquid outlet is connected to the waste liquid pipeline 11 through the second switch valve 15, and the second switch valve 15 controls the discharge of the waste liquid. When the alkali liquid concentration in the alkali cleaning tank 1 is too low, the alkali cleaning tank 1 can be controlled to discharge the waste liquid through the second switch valve 15, and discharged into the waste liquid storage tank through the waste liquid pipeline 11.

[0041] In an example, Figure 1 As shown, the alkali washing tank 1 is provided with a liquid level meter 16 and an alkali solution concentration detector 17 , and both the liquid level meter 16 and the alkali solution concentration detector 17 are linked with the first switch valve 14 and the second switch valve 15 for control.

[0042] Specifically, the control logic of the liquid level meter 16 and the alkali solution concentration detector 17 for controlling the first switch valve 14 and the second switch valve 15 in linkage includes: when the alkali solution concentration detector 17 detects that the concentration of the alkali solution in the alkali washing tank 1 is too low, the second switch valve 15 is opened to drain the liquid; when the liquid level meter 16 detects that the liquid level in the alkali washing tank 1 is lower than 1 / 3 of the normal liquid level, the second switch valve 15 is closed, and the first switch valve 14 is opened to replenish the alkali solution; when the liquid level meter 16 detects that the liquid level in the alkali washing tank 1 reaches the normal liquid level, the first switch valve 14 is closed to stop replenishing the alkali solution. In this way, the alkali solution level of the alkali washing tank 1 can be automatically controlled by the alkali solution concentration detector 17 and the liquid level meter 16 in linkage with the first switch valve 14 and the second switch valve 15, without the need for manual detection and operation, reducing manual work, and reducing labor intensity and labor risks.

[0043] In an example, Figure 1As shown, an inverted U-shaped pipe 18 is provided on one side of the alkali washing tank 1, one end of the inverted U-shaped pipe 18 is connected to the alkali washing tank 1, and the other end thereof is connected to the waste liquid pipeline 11, and the top of the inverted U-shaped pipe 18 is at the same level as the liquid level of the alkali solution in the alkali washing tank 1. When the liquid level of the alkali solution in the alkali washing tank 1 rises, the excess alkali solution will be discharged into the waste liquid pipeline 11 through the inverted U-shaped pipe 18 to maintain the normal liquid level of the alkali solution, which can prevent the alkali solution from being discharged from the top outlet due to excessive liquid level.

[0044] In order to better understand the above embodiments, the working process of the alkali washing device of the present invention for treating flash steam of a continuous sulfur melting device is further described below by taking the alkali washing device of the present invention as an example.

[0045] First, the flash steam from the continuous sulfur melting device enters the alkali washing tank 1 from the gas inlet 3, and comes into direct contact with the alkali solution through the anti-backflow gas distributor 5 after passing through the air inlet short pipe 4. The acidic components in the flash steam are neutralized and absorbed by the alkali solution, and the purified gas is discharged into the atmosphere from the top outlet of the alkali washing tank 1 through the exhaust pipe 7.

[0046] When the volume or pressure of flash steam fluctuates greatly and causes alkali liquid to splash out of the exhaust pipe 7, the splashed alkali liquid is protected by the rain cap 8 and the splash-proof cylinder 9, and falls back into the splash-proof cylinder 9, and then flows into the waste liquid pipe 11 through the drainage outlet at the bottom of the splash-proof cylinder 9 through the first pipe 10.

[0047] When the liquid level in the alkali washing tank 1 rises due to excessive water content brought in by the flash steam, the excess alkali solution will be discharged into the waste liquid pipeline 11 through the inverted U-shaped pipe 18.

[0048] When the alkali solution concentration detector 17 detects that the concentration of the alkali solution in the alkali washing tank 1 is too low, the second switch valve 15 is controlled to open for drainage. When the liquid level meter 16 detects that the liquid level in the alkali washing tank 1 is lower than 1 / 3 of the normal liquid level, the second switch valve 15 is controlled to close and the first switch valve 14 is opened. The alkali solution is replenished from the alkali solution storage tank 12 to the alkali washing tank 1 through the second pipeline 13 by gravity. When the liquid level meter 16 detects that the liquid level in the alkali washing tank 1 reaches the normal liquid level, the first switch valve 14 is closed to stop replenishing the alkali solution.

[0049] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An alkali washing device for treating low-acid component gas, characterized in that: The alkali washing device comprises an alkali washing tank, wherein the alkali washing tank contains alkali solution for neutralizing acidic components, the alkali washing tank is provided with a gas outlet at the top, and a gas inlet is provided above the liquid level of the alkali solution; The gas inlet is connected to the anti-backdraw gas distributor inside the alkali washing tank through an air inlet short pipe, and the anti-backdraw gas distributor is partially submerged below the liquid level of the alkali solution. The anti-backdraw gas distributor can directly contact the low-acid component gas introduced from the gas inlet with the alkali solution, and at the same time can prevent the alkali solution from being backdrawn into the air inlet short pipe.

2. The alkali washing device for treating low-acid component gas according to claim 1, characterized in that: The anti-backflow gas distributor is a truncated cone structure, the top of which is connected to the air inlet short pipe, and the bottom of which is provided with evenly distributed air holes.

3. The alkali washing device for treating low-acid component gas according to claim 2, characterized in that: The angle between the truncated cone slope of the anti-backflow gas distributor and its bottom plane is 30-50°, and the height of the anti-backflow gas distributor submerged below the liquid level of the alkali solution is 1 / 10-1 / 3 of its own height.

4. The alkali washing device for treating low-acid component gas according to claim 1, characterized in that: The alkaline washing device also includes an exhaust chimney connected to the gas outlet, the exhaust chimney is vertically erected, and the height of the exhaust chimney is greater than 15m.

5. The alkali washing device for treating low-acid component gas according to claim 4, characterized in that: A rain cap and a splash proof cylinder are provided at the top of the exhaust pipe. The rain cap is located inside the splash proof cylinder. The rain cap is used to block the alkali liquid directly splashed out from the exhaust pipe, and the splash proof cylinder is used to collect the splashed alkali liquid.

6. The alkali washing device for treating low-acid component gas according to claim 5, characterized in that: The rain cap is located below 1 / 3 of the height of the splash-proof tube. A drainage outlet is provided at the bottom of the splash-proof tube, and the drainage outlet is connected to a waste liquid pipeline through a first pipeline.

7. The alkali washing device for treating low-acid component gas according to claim 1, characterized in that: The alkali washing device also includes an alkali liquid storage tank, which is located at a position higher than the installation position of the alkali washing tank. The alkali liquid storage tank is connected to the alkali washing tank through a second pipeline, and the alkali liquid storage tank can replenish the alkali washing tank with the alkali liquid in a gravity flow manner; the second pipeline is provided with a first switch valve for controlling the connection of the second pipeline.

8. The alkali washing device for treating low-acid component gas according to claim 7, characterized in that: A waste liquid outlet is provided at the bottom of the alkali cleaning tank, and the waste liquid outlet is connected to a waste liquid pipeline through a second switch valve, and the second switch valve controls the discharge of the waste liquid.

9. The alkali washing device for treating low-acid component gas according to claim 8, characterized in that: The alkali washing tank is provided with a liquid level meter and an alkali solution concentration detector, and both the liquid level meter and the alkali solution concentration detector are linked with the first switch valve and the second switch valve for control.

10. The alkali washing device for treating low-acid component gas according to claim 1, characterized in that: An inverted U-shaped tube is provided on one side of the alkali cleaning tank, one end of the inverted U-shaped tube is connected to the alkali cleaning tank, and the other end is connected to the waste liquid pipeline, and the top of the inverted U-shaped tube is at the same level as the liquid level of the alkali solution in the alkali cleaning tank.

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