Methanol cyanogen-containing tail gas absorption treatment equipment

Abstract

The utility model provides methanol cyanogen-containing tail gas absorption treatment equipment which comprises an absorption tower, the top of the absorption tower is provided with an exhaust pipe, the bottom of the absorption tower is communicated with a wastewater pipe, the upper end in the absorption tower is provided with a sprayer used for spraying a sodium hydroxide solution, the bottom in the absorption tower is provided with an absorption tank used for containing liquid, and the wastewater pipe is communicated with the absorption tank. A tail gas pipe is inserted into the absorption tank, a booster fan is mounted on the tail gas pipe, a gas inlet pipe for introducing chlorine is inserted into the middle part of the absorption tower above the absorption tank, and the gas inlet pipe is opened downwards and is arranged below the sprayer. According to the methyl alcohol cyanogen-containing tail gas absorption treatment equipment, chlorine-containing tail gas and cyanogen-containing tail gas can be treated through one absorption tower, and the equipment expenditure and the operation cost are reduced. Sodium hypochlorite generated after the sodium hydroxide absorbs the chlorine-containing tail gas can be supplemented into the absorption tank, the cyanogen-containing tail gas is subjected to primary absorption, the rising cyanogen-containing tail gas is subjected to secondary absorption through the sprayed sodium hydroxide, and the absorption effect of the cyanogen-containing tail gas is improved.

Description

Technical Field

[0001] This application relates to the technology of absorbing and treating cyanide-containing tail gas, and particularly relates to a methanol cyanide-containing tail gas absorption and treatment device. Background Art

[0002] There are cyanides in the methanol cyanide-containing tail gas, and the cyanides need to be absorbed and treated to make the tail gas reach the non-toxic discharge standard. The existing methanol cyanide-containing tail gas contacts reversely with sodium hydroxide sprayed by an absorption tower, so that the cyanides are absorbed into the sodium hydroxide solution, achieving the purpose of removing the cyanides in the cyanide-containing tail gas.

[0003] The existing cyanide-containing tail gas and chlorine-containing tail gas are respectively treated by two sets of absorption devices. The sodium hypochlorite-containing solution generated after treating the chlorine-containing tail gas is directly discharged into the wastewater treatment, causing waste. And the cyanide-containing tail gas only absorbs the cyanides with sodium hydroxide as an absorption liquid, and the absorption effect is limited. The absorption effect can be improved by adding a sodium hypochlorite absorption process. Utility Model Content

[0004] This application provides a methanol cyanide-containing tail gas absorption and treatment device to solve the problems of single absorption method and poor absorption effect of the existing absorption tower for the cyanides in the cyanide-containing tail gas.

[0005] This application provides a methanol cyanide-containing tail gas absorption and treatment device, including an absorption tower. An exhaust pipe is arranged at the top of the absorption tower, and a wastewater pipe is connected to the bottom. A sprayer for spraying sodium hydroxide solution is installed at the upper end in the absorption tower. An absorption pool for containing liquid is arranged at the bottom in the absorption tower. The wastewater pipe is connected to the absorption pool. A tail gas pipe is inserted into the absorption pool, and a booster fan is installed on the tail gas pipe. An air inlet pipe for introducing chlorine gas is inserted into the middle of the absorption tower above the absorption pool, and the opening of the air inlet pipe faces downward and is arranged below the sprayer.

[0006] Optionally, a gas distribution pipe is fixed at the bottom of the absorption pool, and an aerator is installed on the gas distribution pipe. The tail gas pipe is connected to the gas distribution pipe.

[0007] Optionally, a mesh box is arranged in the absorption tower above the absorption pool, and activated carbon is filled in the mesh box.

[0008] Optionally, a floating plate that can float on the liquid surface of the absorption pool is fixed at the bottom of the mesh box. The floating plate is provided with a plurality of through holes, and the floating plate and the mesh box are slidably connected to the inner wall of the absorption tower.

[0009] Compared with the prior art, the beneficial effects of the methanol cyanide-containing tail gas absorption and treatment device provided by this application are:

[0010] In chemical production, chlorine-containing tail gas and cyanide-containing tail gas can be treated through an absorption tower, reducing equipment expenditure and operating costs. An absorption pool with sodium hypochlorite is arranged at the bottom of the absorption tower, and chlorine in the chlorine-containing tail gas is absorbed by sprayed sodium hydroxide, and the generated sodium hypochlorite can be replenished to the absorption pool. The cyanide-containing tail gas is introduced into the absorption pool and can be absorbed once through sodium hypochlorite. The rising cyanide-containing tail gas is then absorbed twice through sprayed sodium hydroxide, which can further remove hydrogen cyanide in the tail gas and improve the absorption effect of the cyanide-containing tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 is the front view of the methanol cyanide-containing tail gas absorption and treatment equipment provided by an embodiment of the present application;

[0013] Figure 2 is the methanol cyanide-containing tail gas absorption and treatment equipment provided by an embodiment of the present application Figure 1 section view;

[0014] Figure 3 is the schematic diagram of the position of the mesh box of the methanol cyanide-containing tail gas absorption and treatment equipment provided by an embodiment of the present application;

[0015] Figure 4 is the top view of the air distribution pipe of the methanol cyanide-containing tail gas absorption and treatment equipment provided by an embodiment of the present application.

[0016] Description of the reference numerals:

[0017] Absorption tower 1; exhaust pipe 2; waste water pipe 3; sprayer 4; absorption pool 5; tail gas pipe 6; booster fan 7; inlet pipe 8; air distribution pipe 9; aerator 10; mesh box 11; activated carbon 12; floating plate 13. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following clearly and completely describes the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts also belong to the scope of protection of the present application.

[0019] Such as Figures 1-4As shown in the figure, an embodiment of the present application provides a methanol-containing cyanide tail gas absorption and treatment device, including an absorption tower 1. An exhaust pipe 2 is provided at the top of the absorption tower 1, and a waste water pipe 3 is connected to the bottom. A sprayer 4 for spraying sodium hydroxide solution is installed at the upper end inside the absorption tower 1, and an absorption pool 5 for containing liquid is provided at the bottom inside the absorption tower 1. The waste water pipe 3 is connected to the absorption pool 5, and a tail gas pipe 6 is inserted into the absorption pool 5. A booster fan 7 is installed on the tail gas pipe 6, and the booster fan 7 is used to make the cyanide-containing tail gas enter the sodium hypochlorite solution. An air inlet pipe 8 for introducing chlorine gas is inserted into the middle of the absorption tower 1 above the absorption pool 5, and the air inlet pipe 8 is arranged with its opening downward below the sprayer 4.

[0020] During use, sodium hypochlorite solution is filled in the absorption pool 5. The sprayer 4 inside the absorption tower 1 sprays sodium hydroxide solution downward. At the same time, chlorine gas or tail gas containing chlorine gas is introduced through the air inlet pipe 8. The chlorine gas rises and contacts the sodium hydroxide solution, generating sodium chloride, sodium hypochlorite and water and forming a solution that flows downward into the absorption pool 5. The cyanide-containing tail gas generated by synthesizing methanol is introduced into the sodium hypochlorite solution in the absorption pool 5 through the tail gas pipe 6. The cyanide-containing tail gas is absorbed once through the sodium hypochlorite solution, and then rises from the liquid level of the absorption pool 5 to the upper end of the absorption tower 1 and is secondarily absorbed by the sodium hydroxide sprayed by the sprayer 4. The tail gas is finally discharged through the exhaust pipe 2, and the waste water generated by absorbing the tail gas is discharged through the waste water pipe 3 for further treatment.

[0021] In this embodiment, the chlorine-containing tail gas and the cyanide-containing tail gas generated in chemical production can be treated through one absorption tower 1, reducing the equipment expenditure and operation cost. An absorption pool 5 with sodium hypochlorite is arranged at the bottom of the absorption tower 1, and the chlorine gas in the chlorine-containing tail gas is absorbed by the sprayed sodium hydroxide, and the generated sodium hypochlorite can supplement the absorption pool 5. The cyanide-containing tail gas is introduced into the absorption pool 5 and can be absorbed once through the sodium hypochlorite. The rising cyanide-containing tail gas is secondarily absorbed by the sprayed sodium hydroxide, which can further remove hydrogen cyanide in the tail gas and improve the absorption effect of the cyanide-containing tail gas.

[0022] In a possible implementation manner, a gas distribution pipe 9 is fixed at the bottom of the absorption pool 5, and an aerator 10 is installed on the gas distribution pipe 9. The tail gas pipe 6 is communicated with the gas distribution pipe 9.

[0023] After the cyanide-containing tail gas enters the absorption pool 5 through the tail gas pipe 6, it is dispersed and discharged from the aerator 10 by the gas distribution pipe 9, which can make the cyanide-containing tail gas contact the sodium hypochlorite solution more fully and improve the absorption effect of the cyanide-containing tail gas in the sodium hypochlorite solution.

[0024] In a possible implementation manner, a mesh box 11 is provided inside the absorption tower 1 above the absorption pool 5, and activated carbon 12 is filled in the mesh box 11.

[0025] The cyanide-containing tail gas that has risen after one absorption is further subjected to an adsorption treatment process with activated carbon 12, which can further adsorb and remove hydrogen cyanide and particulate impurities in the tail gas, enabling the tail gas to meet higher emission standards.

[0026] In a possible implementation manner, a floating plate 13 capable of floating on the liquid surface of the absorption tank 5 is fixed at the bottom of the net box 11. The floating plate 13 is provided with a plurality of through holes, and the floating plate 13 and the net box 11 are slidably connected to the inner wall of the absorption tower 1.

[0027] The net box 11 and the activated carbon 12 float above the sodium hypochlorite solution in the absorption tank 5 through the floating plate 13, and can slide up and down with the level of the liquid surface, which is used to remove the accommodation space between the liquid surface and the activated carbon, enabling the cyanide-containing tail gas after the first absorption to enter the net box 11 in a timely manner and preventing it from staying in the accommodation space.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A methanol-containing cyanide tail gas absorption and treatment device, comprising an absorption tower (1), wherein an exhaust pipe (2) is arranged at the top of the absorption tower (1), and a waste water pipe (3) is communicated at the bottom. A sprayer (4) for spraying sodium hydroxide solution is installed at the upper end in the absorption tower (1), and it is characterized in that: At the bottom inside the absorption tower (1), there is an absorption pool (5) for containing liquid. The wastewater pipe (3) is communicated with the absorption pool (5). A tail gas pipe (6) is inserted into the absorption pool (5). A booster fan (7) is installed on the tail gas pipe (6). In the middle of the absorption tower (1) above the absorption pool (5), an inlet pipe (8) for introducing chlorine gas is inserted. The opening of the inlet pipe (8) faces downward and is arranged below the sprayer (4).

2. The methanol-containing cyanide tail gas absorption and treatment equipment according to claim 1, wherein: At the bottom of the absorption pool (5), a gas distribution pipe (9) is fixed. An aerator (10) is installed on the gas distribution pipe (9). The tail gas pipe (6) is communicated with the gas distribution pipe (9).

3. The methanol-containing cyanide tail gas absorption and treatment equipment according to claim 1, characterized in that: Inside the absorption tower (1) above the absorption pool (5), a mesh box (11) is provided. Activated carbon (12) is filled in the mesh box (11).

4. The methanol-containing cyanide tail gas absorption and treatment equipment according to claim 3, characterized in that: At the bottom of the mesh box (11), a floating plate (13) that can float on the liquid surface of the absorption pool (5) is fixed. The floating plate (13) is provided with a plurality of through holes. The floating plate (13) and the mesh box (11) are slidably connected to the inner wall of the absorption tower (1).

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