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Treatment process for removing hydrogen sulfide, hydrogen cyanide and ammonia from coal gas

A technology of hydrogen sulfide and hydrogen cyanide, which is used in combustible gas purification, combustible gas purification/transformation, petroleum industry, etc., and can solve the problems of heating, increasing process energy consumption, waste water discharge, increasing floor space and investment, etc. , to achieve the effect of improving desulfurization efficiency, reducing equipment material requirements, and small footprint

Active Publication Date: 2019-02-01
上海同特化工科技有限公司
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  • Application Information

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Problems solved by technology

Since the fixed ammonium tower and the volatile ammonia tower also need steam stripping, the pressurized deacidification tower cannot use the fixed ammonium tower and the volatile ammonia tower for heating, and consumes medium-pressure steam. Therefore, the content of this patent publication increases the energy consumption of the process , waste water discharge
In terms of equipment layout, a hydrolysis tower is added to increase the floor area and investment

Method used

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  • Treatment process for removing hydrogen sulfide, hydrogen cyanide and ammonia from coal gas
  • Treatment process for removing hydrogen sulfide, hydrogen cyanide and ammonia from coal gas
  • Treatment process for removing hydrogen sulfide, hydrogen cyanide and ammonia from coal gas

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Experimental program
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Embodiment 1

[0032] according to figure 1 With the aforementioned process, the gas of a coking plant is processed with a processing capacity of 50,000 Nm 3 Gas, its specific technical operation indicators and results are shown in Table 1.

Embodiment 2

[0034] according to figure 1 With the aforementioned process, the gas of a coking plant is processed with a processing capacity of 80,000 Nm 3 Gas, its specific technical operation indicators and results are shown in Table 1.

[0035]

[0036]

[0037] From the data in Table 1, it can be concluded that:

[0038] 1. After the gas is purified, H in the gas 2 The content of S is less than 200mg / Nm 3 , in line with industry access standards.

[0039] 2. It meets the requirements that the hydrogen sulfide content of the bottom wastewater of the deacidification and deamination tower is less than 100mg / L, and the total ammonia content of the tower bottom wastewater is less than 100mg / L.

[0040] 3. The steam consumption is 120-150kg per ton of desulfurized rich liquid.

[0041] 4. The ammonia content in the acid gas of the Claus furnace is less than 0.5% (volume fraction).

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Abstract

The invention discloses a treatment technology for removing hydrogen sulfide, hydrogen cyanide and ammonia in coal gas. The treatment technology comprises feeding coal gas containing hydrogen sulfide, hydrogen cyanide and ammonia from the tower bottom into a composite washing tower, orderly treating the coal gas through a cooling section, a desulfuration section, an alkaline washing section and an ammonia washing section from top to bottom, and after hydrogen sulfide, hydrogen cyanide and ammonia removal, treating the coal gas through a tower top mist catcher and then feeding the coal gas into the next unit. The treatment technology satisfies the national environmental protection relevant law and regulation requirements, has high sulfur, ammonia and cyanogen removal efficiency, realizes low process energy consumption and device integration and has a wide application range.

Description

technical field [0001] The invention relates to a new process for desulfurization, deammoniation and decyanation from coal gas, belongs to chemical engineering technology, and specifically relates to an integrated high-efficiency, low-consumption desulfurization, deammoniation and decyanation process for gas purification. Background technique [0002] At present, most domestic gas desulfurization processes adopt absorption method and catalytic oxidation method, among which the absorption method is mainly vacuum carbonate method, AS method and organic amine absorption method, and the catalytic oxidation method is mainly HPF and PDS. These operating processes have their own characteristics. Among them, HPF and PDS have better desulfurization effects, but desulfurization waste liquid and low-quality sulfur paste are difficult to deal with. The vacuum carbonate method also has the problem that the desulfurization waste liquid is difficult to deal with. Although the AS process d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/12C10K1/10
Inventor 余兆祥刘忠安黄恒波杨勇李桂成张婧
Owner 上海同特化工科技有限公司
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