CN215799350U - Coke-oven gas catalytic desulfurization and decyanation device - Google Patents

Abstract

The utility model provides a catalytic desulfurization and decyanation device for coke oven gas, which comprises a heat exchange bin, a pretreatment liquid tank and a catalysis bin; the heat exchange bin body is provided with an air inlet and a pretreatment air port, and a spiral heat exchange tube is arranged in the heat exchange bin body; the pretreatment gas port extends downwards below the liquid level of the pretreatment liquid tank; the pretreatment liquid tank is provided with a sealing top cover, the inlet end of the spiral heat exchange tube is connected with the sealing top cover in an extending way, and the outlet end of the spiral heat exchange tube extends out of the heat exchange bin body and is connected with the catalytic bin; a catalyst unit is arranged in the catalysis cabin; by the mode, heat is recovered by heat exchange, energy is saved, and the requirement of the next catalytic reaction is met; the parallel catalytic design is convenient for replacing the catalytic unit in a single catalyst bin, and simultaneously, the pressure drop of the catalytic reaction is reduced; the pretreatment liquid only carries out primary treatment on gas and does not absorb harmful substances; the solid state recovery of harmful substances through catalytic reaction provides a diversified subsequent treatment method.

Description

Coke-oven gas catalytic desulfurization and decyanation device

Technical Field

The utility model relates to the technical field of coke oven gas treatment, in particular to a catalytic desulfurization and decyanation device adopting coke oven gas.

Background

In the coking industry, desulfurization and decyanation treatment of coke oven gas is a very important process. Coal gas formed by coal coking or pyrolysis is an important chemical raw material of medium-high calorific value gas fuel, can be used for steel production, can be used as urban resident fuel gas, and can be used as raw material gas for producing products such as synthetic ammonia, methanol and the like, and the sulfur content of the coke oven gas must be reduced to a certain degree no matter which way is adopted to utilize the coke oven gas. The coking coal raw material contains 0.5-l.2% of sulfur, wherein 20-45% of sulfur enters raw gas in a sulfide form to form hydrogen sulfide gas, and a considerable amount of hydrogen cyanide is also contained. The raw gas generated by the coke oven contains various impurities and needs to be purified. The coke oven gas generally contains 4-10 g/m3 of hydrogen sulfide, 4-9 g/m3 of ammonia and 0.5-1.5 g/m3 of hydrogen cyanide. Hydrogen sulfide (H2S) and its combustion product sulfur dioxide (SO2) are toxic to humans, and hydrogen cyanide is more toxic. Hydrogen cyanide and ammonia generate Nitrogen Oxides (NOX) during combustion, sulfur dioxide and the nitrogen oxides are main substances for forming acid rain and haze, and wet desulphurization, decyanation and ammonia washing of coal gas are mainly based on the requirement of environmental protection. In addition, the sulfur content of the fuel gas used for rolling high-quality steel materials is also higher, the sulfur and cyanogen content of the gas are more strict for producing a carbon chemical product, and the existence of hydrogen sulfide in the gas not only corrodes production equipment, but also causes washing oil and water absorbing crude benzene to form emulsion, thereby influencing oil-water separation. Most processes for carbon production involve catalysts, sulfur and cyanogen have strong affinity for the catalysts, and the combination loses the catalytic effect on the production, i.e. the production process cannot be carried out. Therefore, the removal of hydrogen sulfide and cyanide is of great significance to the reduction of atmospheric and water pollution, the enhancement of environmental protection, the reduction of equipment corrosion and the long-term continuous steady-state operation of the carbon-catalyst.

At present, wet desulphurization and decyanation treatment is widely accepted due to low investment and easy operation, such as a TH method, an FRC method, an HPF method and the like, but the problems of resource utilization of waste liquid in the later period, high energy consumption and the like also restrict the application of some enterprises. Therefore, the development of the coke oven gas dry catalytic desulfurization and decyanation process with low cost, low operation intensity and convenient use is of great practical significance

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a scheme for catalytic desulfurization and decyanation of coke oven gas, which has low cost and simple and convenient operation and does not need to treat waste liquid by self.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a coke oven gas catalytic desulfurization and decyanation device comprises a heat exchange bin, a pretreatment liquid tank and a catalytic bin; the heat exchange bin body is provided with an air inlet and a pretreatment air port, and a spiral heat exchange tube is arranged in the heat exchange bin body; the pretreatment gas port extends downwards below the liquid level of the pretreatment liquid tank; the pretreatment liquid tank is provided with a sealing top cover, the inlet end of the spiral heat exchange tube is connected with the sealing top cover in an extending way, and the outlet end of the spiral heat exchange tube extends out of the heat exchange bin body and is connected with the catalytic bin; a catalyst unit is arranged in the catalysis cabin, and an air outlet is formed in one end, opposite to the spiral heat exchange tube, of the catalysis cabin.

Furthermore, the spiral heat exchange tubes are designed in three parallel connection modes and are respectively and independently connected with one catalytic bin;

preferably, the outlet end of the spiral heat exchange tube is provided with a valve;

further, the gas inlet is provided with a gas pre-filtering device;

further, the pretreatment air port is provided with a check valve;

further, the pretreatment liquid groove is provided with a liquid inlet and a liquid outlet.

The utility model has the following technical effects:

1. the coke oven gas is treated by the pretreatment liquid, so that solid and liquid impurities in the gas are effectively removed, and the loss of the catalyst is reduced;

2. heat is recovered by heat exchange, so that energy is saved and the requirement of the next catalytic reaction is met;

3. the parallel catalytic design is convenient for replacing the catalytic unit in a single catalyst bin, and simultaneously, the pressure drop of the catalytic reaction is reduced;

4. the pretreatment liquid only carries out primary treatment on gas and does not absorb harmful substances; the solid state recovery of harmful substances through catalytic reaction provides a diversified subsequent treatment method.

Drawings

FIG. 1 is a schematic structural diagram of a catalytic desulfurization and decyanation device for coke oven gas.

Wherein:

1. a heat exchange chamber; 11. an air inlet; 12. pre-treating the gas port; 13. a non-return valve; 14. a gas pre-filtration device; 2. A pretreatment liquid tank; 3. a spiral heat exchange tube; 31. an inlet end of a spiral heat exchange tube; 32. the outlet end of the spiral heat exchange tube; 33. a valve; 4. and a catalysis cabin.

Detailed Description

The technical solutions of the present invention are further described below by referring to the drawings and the following examples, which are only used to more clearly illustrate the technical solutions of the present invention and should not be taken as limiting the scope of the present invention.

Example 1

A coke oven gas catalytic desulfurization and decyanation device comprises a heat exchange bin 1, a pretreatment liquid tank 2 and a catalytic bin 4; the heat exchange bin body is provided with an air inlet 11 and a pretreatment air port 12, and three parallel spiral heat exchange tubes 3 are arranged in the heat exchange bin body; the pretreatment air port 12 extends downwards below the liquid level of the pretreatment liquid tank 2; the pretreatment liquid tank 2 is provided with a closed top cover, the inlet end 31 of the spiral heat exchange tube is connected with the closed top cover in an extending way, and the outlet end 32 of the spiral heat exchange tube extends out of the bin body of the heat exchange bin 1 and is respectively connected with the catalytic bins 4; a catalyst unit is arranged in the catalysis cabin 4, and an air outlet is formed in one end, opposite to the spiral heat exchange tube 3, of the catalysis cabin 4.

A valve 33 is arranged at the outlet end of the spiral heat exchange tube 3;

the gas inlet 11 is provided with a gas pre-filtering device 14;

the pretreatment air port 12 is provided with a check valve 13;

the pretreatment liquid groove is provided with a liquid inlet and a liquid outlet.

Coke oven gas enters the heat exchange bin through the gas inlet pre-filtering device and enters the pretreatment liquid from the pretreatment gas port to further remove solid and liquid impurities; the pretreated gas rises to be discharged out of the liquid level, enters a spiral heat exchange tube, exchanges heat with high-temperature gas newly entering a heat exchange bin, reduces the temperature of the gas before pretreatment, and improves the problem of the pretreated gas; the gas enters a catalytic reaction chamber for absorption, and desulfurization and decyanation are realized for the next step of application. The catalytic bins are designed in parallel, and the catalyst can be replaced without shutdown only by closing the air inlet valves of the corresponding catalytic bins.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A coke oven gas catalytic desulfurization and decyanation device comprises a heat exchange bin, a pretreatment liquid tank and a catalytic bin; the method is characterized in that:

the heat exchange bin body is provided with an air inlet and a pretreatment air port, and a spiral heat exchange tube is arranged in the heat exchange bin body; the pretreatment gas port extends downwards below the liquid level of the pretreatment liquid tank; the pretreatment liquid tank is provided with a sealing top cover, the inlet end of the spiral heat exchange tube is connected with the sealing top cover in an extending way, and the outlet end of the spiral heat exchange tube extends out of the heat exchange bin body and is connected with the catalytic bin; a catalyst unit is arranged in the catalysis cabin, and an air outlet is formed in one end, opposite to the spiral heat exchange tube, of the catalysis cabin.

2. The catalytic desulfurization and decyanation device of coke oven gas as claimed in claim 1, characterized in that:

the spiral heat exchange tubes are designed in three parallel connection modes and are respectively and independently connected with one catalytic cabin.

3. The coke oven gas catalytic desulfurization and decyanation device according to claim 1 or 2, characterized in that:

and a valve is arranged at the outlet end of the spiral heat exchange tube.

4. The catalytic desulfurization and decyanation device of coke oven gas as claimed in claim 1, characterized in that:

the air inlet is provided with an air pre-filtering device.

5. The catalytic desulfurization and decyanation device of coke oven gas as claimed in claim 1, characterized in that:

the pretreatment air port is provided with a check valve.

6. The catalytic desulfurization and decyanation device of coke oven gas as claimed in claim 1, characterized in that:

the pretreatment liquid groove is provided with a liquid inlet and a liquid outlet.

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