CN217351275U

CN217351275U - Gas fine desulfurization device

Info

Publication number: CN217351275U
Application number: CN202221289250.8U
Authority: CN
Inventors: 王建军
Original assignee: Sichuan Xiyou Zhicheng Petroleum Technology Co ltd
Current assignee: Sichuan Xiyou Zhicheng Petroleum Technology Co ltd
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-09-02
Anticipated expiration: 2032-05-26

Abstract

The utility model discloses a coal gas fine desulfurization device, which comprises a desulfurization unit, a regeneration unit and a filtering unit; the desulfurization unit comprises a raw material gas liquid separation tank, a preprocessor, a spray absorption tower and a purified gas liquid separation tank which are sequentially connected with sulfur-containing coal gas; a mixing pipe is arranged in the preprocessor, the outlet of the mixing pipe faces the bottom of the preprocessor, and the coal gas and the barren solution enter the mixing pipe in a convection mode and then enter the preprocessor from the outlet of the mixing pipe for gas-liquid separation; the spray absorption tower is a bubble tower; the lean solution is absorbed by hydrogen sulfide in the preprocessor and the spray absorption tower to generate a rich solution, the rich solution in the preprocessor, the spray absorption tower and the purified gas liquid separation tank enters a buffer tank for flash evaporation, and the flash evaporated rich solution enters a regeneration unit for regeneration. The utility model discloses adopt the empty tower desulfurization that mass transfer efficiency is lower with the help of the fast advantage of complex iron desulfurizer desulfurization, simplified under the little condition of desulfurization efficiency bulk change and sprayed the absorption tower structure, difficult sulphur is stifled, and operation elasticity is big moreover.

Description

Gas fine desulfurization device

Technical Field

The utility model relates to a coal gas desulfurization technical field specifically is a coal gas fine desulphurization device.

Background

For many years, in the coke oven gas desulfurization, a cobalt phthalocyanine sulfonate (PDS) desulfurizer is mainly used, and a relatively mature process device is provided, however, the process has high secondary salt yield, and in view of the above reasons, in recent years, people begin to apply a complex iron (one of liquid phase oxidation reduction methods) desulfurization technology to the coke oven gas, and the problems of large consumption and easy poisoning failure of the complex iron desulfurizer are overcome by improving the complex iron desulfurizer, so some achievements are obtained, for example, the complex iron desulfurizer disclosed in Chinese patent CN202010040218.5 has the advantages of low secondary salt yield, high regeneration speed and high sulfur capacity, however, the effect of the desulfurizer cannot be fully exerted due to the adoption of the process flow of the original PDS desulfurization method in the coke oven gas desulfurization at present, for example, the process and the device for purifying the coke oven gas based on the complex iron catalyst disclosed in CN202010979596.X, the packing spray absorption tower is adopted, the number of internal components is large, the problem of sulfur blockage is easy to occur, and for the packing tower, the problem of uneven distribution caused by bias flow exists when the flow rate of a desulfurizer is small, so that the desulfurization efficiency is seriously influenced, the operation flexibility is limited, and the desulfurization liquid of the packing spray absorption tower needs to be larger than a certain value no matter how low the gas load is, and cannot be continuously reduced.

SUMMERY OF THE UTILITY MODEL

In view of above technical problem, an object of the utility model is to provide a coal gas fine desulphurization device, this device adopts the empty tower desulfurization that mass transfer efficiency is lower with the help of the fast advantage of complex iron desulfurizer desulfurization, has simplified the absorption tower structure that sprays under the little condition of desulfurization efficiency overall change, and difficult sulphur is stifled, and operation elasticity is big moreover.

The utility model adopts the following technical proposal:

a coal gas fine desulfurization device comprises a desulfurization unit, a regeneration unit and a filtering unit; the desulfurization unit is used for removing hydrogen sulfide in the coal gas, and meanwhile, the barren solution absorbs the hydrogen sulfide to generate rich solution; the regeneration unit is used for mixing and reacting the rich solution and air to regenerate lean solution and generate sulfur at the same time; the filtering unit is used for filtering sulfur in the barren solution;

the desulfurization unit comprises a raw material gas liquid separation tank, a preprocessor, a spray absorption tower and a purified gas liquid separation tank which are sequentially connected with the sulfur-containing coal gas; the raw gas separation liquid tank and the purified gas separation liquid tank are used for separating condensate liquid in gas; the preprocessor and the spray absorption tower are both provided with barren liquor inlets for removing hydrogen sulfide in the sulfur-containing gas; the pretreater is of a tank-shaped structure, a mixing pipe is arranged in the pretreater, the outlet of the mixing pipe faces the bottom of the pretreater, and the coal gas and the desulfurization liquid enter the mixing pipe in a convection mode and then enter the pretreater from the outlet of the mixing pipe for gas-liquid separation; the spray absorption tower is a bubble tower, and sulfur-containing coal gas enters the spray absorption tower through a central pipe positioned at the lower part of the spray absorption tower; the barren solution generates rich solution after absorbing hydrogen sulfide in the preprocessor and the spray absorption tower, the rich solution in the preprocessor, the spray absorption tower and the purified gas liquid separation tank enters a buffer tank for flash evaporation, and the flash evaporated rich solution enters a regeneration unit for regeneration.

As an embodiment of the present invention, the regeneration unit includes a regeneration tower, a lean solution tank, a sulfur foam tank, a blower, a regeneration air cooler, and a lean solution circulating pump; the air provided by the blower is cooled by a regeneration air cooler and then is sent to the lower part of the regeneration tower for regeneration of the pregnant solution; the regeneration tower is a bubble tower, and the rich liquid from the buffer tank is mixed with air and then enters the regeneration tower through a central pipe positioned at the lower part of the regeneration tower; the liquid phase in the middle of the regeneration tower enters a lean solution tank; the sulfur foam in the regeneration tower automatically flows into a sulfur foam tank through an annular groove at the upper part in the body, and the regenerated air in the regeneration tower is directly discharged; the liquid phase in the barren liquor tank is sent into a desulfurization unit through a barren liquor circulating pump; a stirrer is arranged in the sulfur foam tank and used for stirring the solution and assisting the sulfur foam to be crushed, and liquid in the sulfur foam tank is sent to the filtering unit through a sulfur foam pump;

as an embodiment of the present invention, the filtering unit includes a filter press, a filtrate collecting tank, and a filtrate recycling pump; and the solid-liquid mixture in the sulfur foam tank enters a filter press through a sulfur foam pump to be filtered, solid sulfur is filtered out, the filtered liquid is clear liquid and directly enters a filtrate collecting tank, and a filtrate recycling pump is used for sending the clear liquid (barren liquid) in the filtrate collecting tank into a regeneration unit for recycling.

As a specific embodiment of the present invention, the buffer tank is communicated with the barren liquor tank through a communicating pipe. The method is mainly suitable for the working condition with extremely low operating load, for example, 10% of operating load, the required lean solution amount is very small, but at the moment, the blockage of a bottom outlet caused by the precipitation of micro sulfur particles in a preprocessor and a spray absorption tower still needs to be prevented, so that a certain flow rate, namely a certain circulating amount of the desulfurization solution, is required to be maintained, at the moment, the sulfur capacity of the rich solution in a buffer tank is low, the capacity of reabsorption is achieved, the rich solution returns to the lean solution tank and is continuously used without regeneration, the regeneration cost can be saved, and the regeneration part can be regenerated even in an intermittent mode to save energy.

As a specific embodiment of the present invention, the gas phase outlet of the purified gas liquid separation tank is communicated with the second desulfurizing tower, and the second desulfurizing tower is filled with a solid desulfurizing agent for strictly ensuring the quality of the produced gas.

The utility model has the advantages as follows: the utility model discloses adopt the empty tower desulfurization that mass transfer efficiency is lower with the help of the fast advantage of complex iron desulfurizer desulfurization, simplified the absorption tower structure that sprays under the little condition of desulfurization efficiency overall change, difficult sulphur is stifled, and operation elasticity is big moreover.

Drawings

FIG. 1 is a flow chart of a desulfurization unit according to the present invention;

fig. 2 is a flow chart of the preprocessor of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

A coal gas fine desulfurization device comprises a desulfurization unit, a regeneration unit and a filtering unit; the desulfurization unit is used for removing hydrogen sulfide in the coal gas, and meanwhile, the barren solution absorbs the hydrogen sulfide to generate a rich solution; the regeneration unit is used for mixing and reacting the rich solution and air to regenerate lean solution and generate sulfur at the same time; the filtering unit is used for filtering the sulfur in the barren solution.

The desulfurization unit comprises a raw material gas liquid separation tank 1, a preprocessor 2, a spray absorption tower 3, a purified gas liquid separation tank 4 and a second desulfurization tower 5 which are sequentially connected with sulfur-containing coal gas. The raw material gas divides the liquid tank 1 and purifies the gas and divides the liquid tank 4 to have the demister in the fluid tank, used for separating the condensate liquid in the gas, wherein, the liquid in the raw material gas divides the liquid tank 1 to be the sulphur, oily sewage, send to the sewage treatment unit to process, purify the liquid that divides the liquid tank 4 to be the rich solution or barren solution, send into the regeneration unit to process after passing buffer tank 6 together with the rich solution. The preprocessor 2 and the spray absorption tower 3 are both provided with lean solution inlets for removing hydrogen sulfide in the sulfur-containing gas. Referring to fig. 2, the pre-processor 2 is a tank-shaped structure, a mixing pipe 21 is arranged in the pre-processor, an outlet of the mixing pipe 21 faces the bottom of the pre-processor 2, and the gas and the barren solution enter the mixing pipe in a convection manner and then enter the pre-processor 2 from an outlet of the mixing pipe 21 for gas-liquid separation; the spray absorption tower 3 is a bubble tower, and sulfur-containing coal gas enters the spray absorption tower through a central pipe positioned at the lower part of the spray absorption tower 3; the lean solution is absorbed by hydrogen sulfide in the preprocessor 2 and the spray absorption tower 3 to generate a rich solution, the liquids in the preprocessor 2, the spray absorption tower 3 and the purified gas liquid separation tank 5 enter the buffer tank 6 for flash evaporation, the flash evaporated rich solution enters the regeneration unit for regeneration, and the second desulfurization tower 5 is filled with a solid desulfurizer for strictly ensuring the quality of the produced gas.

The regeneration unit comprises a blower 7, a regeneration air cooler 8, a regeneration tower 9, a barren liquor tank 10 and a sulfur foam tank 11; the air provided by the blower 7 is cooled by a regeneration air cooler 8 and then is sent to the lower part of a regeneration tower 9 for rich liquid regeneration; the regeneration tower 9 is a bubble tower, the rich solution from the buffer tank 6 is pressurized by a rich solution pump 13 and then mixed with air, and the mixture of the rich solution and the air enters the regeneration tower 9 through a central pipe positioned at the lower part of the regeneration tower 9; the liquid phase in the middle of the regeneration tower 9 enters a lean solution tank 10; the sulfur foam in the regeneration tower 9 automatically flows into a sulfur foam tank 11 through an annular groove at the upper part in the body, and the regenerated air in the regeneration tower 9 is directly discharged; the liquid phase in the lean liquor tank 10 is sent to a desulfurization unit through a lean liquor circulating pump 14; a stirrer is arranged in the sulfur foam tank 11 and used for stirring solution and assisting the sulfur foam to be crushed, and liquid in the sulfur foam tank 11 is sent to the filtering unit through a sulfur foam pump 12.

The filtering unit comprises a filter press 15, a filtrate collecting tank 16 and a filtrate recovery pump 17; the solid-liquid mixture in the sulfur foam tank 11 enters a filter press 15 through a sulfur foam pump 12 to be filtered, solid sulfur is filtered, the filtered liquid is clear liquid and directly enters a filtrate collecting tank 16, and a filtrate recycling pump 17 is used for sending the clear liquid (barren liquid) in the filtrate collecting tank 16 into a barren liquid tank 10 of a regeneration unit to be recycled.

In addition, aiming at the situation that the sulfur capacity of the rich liquid in the buffer tank is low and the desulfurization can be continued when the gas load is extremely low, a rich liquid circulation flow is designed to save energy, specifically, the buffer tank 6 is communicated with the lean liquid tank 10 through a communicating pipe, and a hand valve is arranged on the communicating pipe.

The filtrate collection tank 16 is also connected with a medicament and water replenishing pipeline 18 for replenishing medicament and water to the system to maintain the properties of the desulfurizing agent of the system and the liquid level stability of each tower and tank.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Various other modifications and changes can be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims.

Claims

1. A gas fine desulfurization device comprises a desulfurization unit, a regeneration unit and a filtering unit; the desulfurization unit is used for removing hydrogen sulfide in the coal gas, and meanwhile, the barren solution absorbs the hydrogen sulfide to generate rich solution; the regeneration unit is used for mixing and reacting the rich solution and air to regenerate lean solution and generate sulfur at the same time; the filtering unit is used for filtering sulfur in the barren solution and is characterized in that,

the desulfurization unit comprises a raw material gas liquid separation tank, a preprocessor, a spray absorption tower and a purified gas liquid separation tank which are sequentially connected with the sulfur-containing coal gas; the preprocessor and the spray absorption tower are both provided with barren liquor inlets; a mixing pipe is arranged in the preprocessor, the outlet of the mixing pipe faces the bottom of the preprocessor, a gas pipeline at the top of the raw material gas liquid separating tank is connected with the mixing pipe, a lean solution inlet of the preprocessor extends into the mixing pipe, and the lean solution inlet of the preprocessor is over against the outlet of the gas pipeline at the top of the raw material gas liquid separating tank; the spray absorption tower is a bubble tower, and sulfur-containing coal gas enters the spray absorption tower through a central pipe positioned at the lower part of the spray absorption tower; the liquid phase in the preprocessor, the spray absorption tower and the purified gas liquid separation tank is connected with the buffer tank through a pipeline, and the liquid phase of the buffer tank is connected with the regeneration unit through a pipeline.

2. The fine coal gas desulfurization device according to claim 1, wherein a gas phase outlet of the purified gas-liquid separation tank is communicated with a second desulfurization tower, and the second desulfurization tower is filled with a solid desulfurizing agent.

3. The fine gas desulfurization device according to claim 1, wherein the regeneration unit comprises a regeneration tower, a lean solution tank, a sulfur foam tank, a blower, a regeneration air cooler and a lean solution circulating pump; the outlet of the blower is connected with the inlet of the regeneration air cooler, the regeneration tower is a bubble tower, a liquid outlet pipeline of the buffer tank and the outlet of the regeneration air cooler are both connected with a central pipe positioned at the lower part of the regeneration tower, and the outlet of the central pipe positioned at the lower part of the regeneration tower is positioned at the lower part of the regeneration tower; the middle part of the regeneration tower is connected with a barren liquor tank through a pipeline, an annular groove is arranged at the upper part of the regeneration tower body, the annular groove is connected with a sulfur foam tank, and the inlet of the pipeline connecting the annular groove and the sulfur foam tank is positioned above the outlet; a gas emptying pipeline is arranged at the top of the regeneration tower; the liquid phase in the barren liquor tank is connected with a desulfurization unit through a barren liquor circulating pump; a stirrer is arranged in the sulfur foam tank; the liquid in the froth tank is connected with the filtering unit through a froth pump.

4. The coal gas fine desulfurization device according to claim 3, characterized in that the buffer tank is communicated with the lean solution tank through a communicating pipe, and a hand valve is arranged on the communicating pipe.

5. The fine coal gas desulfurization device according to claim 1, wherein the filtration unit comprises a filter press, a filtrate collection tank, a filtrate recovery pump; the outlet of the sulfur foam pump is connected with the inlet of the filter press, the liquid outlet of the filter press is connected with the filtrate collecting tank, and the liquid phase of the filtrate collecting tank is connected with the regeneration unit through the filtrate recovery pump.