Self-heating heat-pump energy-saving device for lurgi furnace gasification sewage and method for sewage pretreatment with device

A technology for gasifying sewage and energy-saving devices, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., which can solve the problems of high energy consumption, high operating cost, and easy blockage of equipment. , to achieve the effect of reducing energy consumption and treatment costs, eliminating crystallization and scaling, and achieving obvious energy-saving effects
CN103073144BInactive Publication Date: 2014-01-22CHINA COAL ENERGY HEILONGJIANG COAL CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA COAL ENERGY HEILONGJIANG COAL CHEM
Publication Date
2014-01-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a sewage pretreatment device and a method for sewage pretreatment with the device, in particular to a self-heating heat-pump energy-saving device for lurgi furnace gasification sewage and a method for the sewage pretreatment with the device. The problems that the existing lurgi furnace sewage treatment technology is high in energy consumption and operating cost, and equipment is blocked easily are solved. The self-heating heat-pump energy-saving device for the lurgi furnace gasification sewage comprises a vacuum extraction and sedimentation compound tower, an evacuating device, a heat exchange knockout tower, a circulating pump, an aqua-ammonia pump and a sewage circulating pump. The method comprises the steps that hot sewage enters the vacuum extraction and sedimentation compound tower; sensible heat in the sewage entering the vacuum extraction and sedimentation compound tower is converted to gasification latent heat by pressure reduction through the evacuating device; pressure is recovered after the sewage enters the heat exchange knockout tower; the latent heat is released to be converted to the sensible heat; and the heat is sent back by heat-exchange heating low-temperature sewage for cycling. The device and the method can be applied to pretreatment of the lurgi furnace gasification sewage.
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Description

technical field

[0001] The invention relates to a sewage pretreatment device and a sewage pretreatment method using the same. Background technique

[0002] Lurgi furnace is a type of coal gasification furnace with many applications and stable operation. The commonly used furnace type has a daily production capacity of 480,000 standard cubic meters of city gas and a daily processing of about 500 tons of raw coal. Since the crude gas is washed with water, the volume of gas washing sewage generated during the production process is 42 tons per hour. The pollution load of these sewage is very high, containing a large amount of ammonia, carbon monoxide, carbon dioxide, hydrogen sulfide, phenol, tar and coal dust, etc. After pretreatment such as flash evaporation and sedimentation, the total phenol concentration is 6000mg / L, and the COD value is 20000mg / L , the pH value is about 9~10.5.

[0003] At present, the combination of chemical treatment process and biochemical treatment o...

Claims

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