Lurgi furnace coal gasification wastewater treatment and reuse technology

Abstract

The invention discloses a Lurgi furnace coal gasification wastewater treatment and reuse technology, comprising the steps of adopting aeration adjustment, oil separation and sedimentation, hydrolysis acidification, denitrification treatment, first order carrier fluidized bed decarburization, residual COD removement with activated sludge, second order carrier fluidized bed ammonia / nitrogen removement, sludge-water separation, precipitation, oxidation reaction, residual ozone removement, organic waste removement and floating filter treatment to treat the coal gasification wastewater of a Lurgi furnace coal gasification factory and obtaining water which can be reused. The invention has simple operation and low process cost and the treated effluent can be used as the cooling water of boiler furnaces, thus fully recycling the treated Lurgi furnace coal gasification wastewater.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a Lurgi furnace coal gasification sewage treatment and reuse technology, which belongs to the technical field of sewage treatment. Background technique [0002] The direct combustion of coal can only exert 30% of its efficiency, and the remaining nearly 70% of energy is wasted in vain. In order to make full use of energy, countries all over the world attach great importance to the development of coal conversion technology. Lurgi furnace coal gasification is an efficient coal utilization method, and Lurgi furnace coal gasification sewage is also produced in the coal conversion process. Generally, Lurgi furnace coal gasification sewage comes from two ways: one is steam used as a gasification agent in the gasification process. The steam water not involved in gasification in the gasification section; the second is the waste water generated when the crude gas is cooled and washed. Gas...

AI Technical Summary

Problems solved by technology

The current treatment process and technology are difficult to achieve the standard

[0003]In order to treat the Lurgi furnace coal gasification wastewater as well as possible, in the existing technology, the combination of chemical separation and biochemical treatment is generally used at home and abroad to treat the wastewater Chemical separation includes unit processes such as stripping, extraction, and rectification to remove acid gases and recover phenol, ammonia, etc. The operation status is generally not good; while biochemical treatment mostly adopts aerobic treatment, anaerobic treatment, aerobic treatment, activated sludge or biofilm method and combined process, the requirements for biochemical treatment operation and management are high, and the biochemical capacity of different systems varies greatly , so that its promotion is limited to a certain extent, therefore, it is difficult for the current treatment process and technology to achieve discharge standards

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