Deep purification and treatment technology and system for fluorine-containing coal gas water

Abstract

The invention discloses a deep purification and treatment technology and system for fluorine-containing coal gas water. The technology comprises the following steps: carrying out flash evaporation separation, air floating filtering and middle-pressure steam stripping on high-pressure fluorine-containing coal gas water to be treated, so as to realize pre-treatment of the coal gas water; then distributing and adding lime milk and calcium chloride to strengthen and promote a chemical sediment effect of fluorine ions in the fluorine-containing coal gas water; then realizing deep purification and treatment of the fluorine-containing coal gas water through a coagulating sedimentation and flocculation sedimentation treatment technology; discharging after the fluorine content of the treated fluorine-containing coal gas water meets discharging standards of being less than or equal to 10mg / L and is qualified. According to the deep purification and treatment technology and system, disclosed by the invention, the fluorine ions can be deeply removed and the removal rate is high (95 percent to 99 percent) and is better than the removal rate of traditional defluorinating and purification technological method and device in which a single defluorinating agent is added; the deep purification and treatment technology and system have the advantages of small defluorinating agent dosage, small sludge yield, small scale, small consumption and small occupied area of the device, environmental friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to a process and a device for gas water purification process, in particular to a process and system for deeply purifying fluorine-containing gas water in coal chemical industry. Background technique [0002] In the field of coal chemical industry, the Lurgi furnace belongs to the fixed-bed pressurized gasifier. Due to the characteristics of the process conditions of the gasification process, when coal is gasified, crude gas washing, condensation separation, purification and other operating processes produce gas water, its composition is complex Diverse, containing a large amount of coal dust, light oil, tar, phenols, benzene, ammonia, etc., the treatment is relatively difficult, which is also one of the main problems encountered in the application and promotion of this coal gasification technology in the market; when fluorine-containing coal is used as When the raw mate...

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Problems solved by technology

[0004] Conventional purification and treatment of fluorine-containing wastewater at home and abroad: precipitation method, adsorption method and ion exchange method cannot complete the defluorination of fluorine-containing gas water with the above-mentioned complex components

How to realize the task of further defluorinating the gas water containing fluorine, which is difficult to deal with, has become a thorny problem in solving the gas water treatment of fluorine-containing coal using Lurgi furnace coal to gas

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