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Coal gasification wastewater treating and recycling method and device

A coal gasification waste water, gas water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficult to meet discharge standards, and achieve a small footprint of the device , large processing capacity, and the effect of process optimization

Active Publication Date: 2014-07-16
TIANJI COAL CHEM IND GROUP
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Problems solved by technology

[0013] For the treatment of coal gasification wastewater, it is difficult to meet the discharge standards by purely physical, physical chemical, chemical, and biological methods. It often requires a treatment system composed of several methods to meet the treatment requirements.

Method used

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  • Coal gasification wastewater treating and recycling method and device

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Embodiment Construction

[0050] For further disclosing the technological route of the present invention, below in conjunction with description figure 2 Describe the process route in detail.

[0051] After the coal gasification wastewater transported from the coal pressurized gasification device is pretreated by tar separation, light oil separation, and double-media filtration, the high-pressure gas water pump 1 is used for medium-pressure stripping, and then the gas water is transported to the heat exchanger 2 Carry out preheating, the gas water after the preheating enters stripping tower 3 and carries out medium-pressure stripping, and medium-pressure superheated steam directly leads to the bottom of stripping tower, and 20% lye is sent to the bottom of stripping tower by lye metering pump 4 Feed line, stripping out CO 2 、H 2 S, NH 3 and trace inert gas and other volatile substances, the saturated steam after stripping is sent to the gasifier for reuse as a gasification agent, and the high-temper...

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Abstract

The invention relates to a coal gasification wastewater treating and recycling method and device. The coal gasification wastewater treating and recycling method comprises the following steps: carrying out medium-pressure steam stripping on coal gasification wastewater generated by coal pressure gasification, exchanging heat, preheating / cooling, sequentially carrying out shallow air-floatation, hydrolytic acidification, anaerobic-aerobic biological treatment, membrane biological reaction and ozone oxidation, adsorbing matters by using carbon, filtering by using multiple mediums, sequentially carrying out self-cleaning filtration, ultrafiltration, cartridge filtration, reverse osmosis and ion exchange adsorption, and feeding into a water feeding system of a high pressure boiler. The coal gasification wastewater treating and recycling method optimally combines various wastewater treatment methods and is used for solving the problems that after being treated, the coal gasification wastewater is difficult to reach the discharge standard, and the realization of zero discharge by recycling is difficult.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a coal gasification wastewater treatment and recycling process. The invention also relates to a device for carrying out the method. Background technique [0002] In recent years, Lurgi’s pressurized coal gasification technology has been widely used in coal chemical plants such as coal-to-gas, coal-to-ammonia, and coal-to-oil in China. However, this process will produce a large amount of highly polluted wastewater with complex water components. Wastewater not only contains a large amount of suspended solids and water-soluble inorganic compounds, but also contains a large amount of phenolic compounds, benzene and its derivatives, pyridine, etc., and also contains toxic and harmful substances such as cyanide, inorganic fluoride ions, and ammonia nitrogen. High-concentration organic industrial wastewater that is difficult to biodegrade. Therefore, the trea...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 丁明公刘金亮王福存崔建则郭晓霞段志栋黄海燕
Owner TIANJI COAL CHEM IND GROUP
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