Coal gasification grey water treatment zero-discharge system

A zero-discharge, gray water technology, applied in the field of water treatment, can solve problems such as water pollution, waste of water resources, equipment scaling and blockage

Pending Publication Date: 2021-05-18
HUANENG CLEAN ENERGY RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after long-term circulation, the salt in the gray water system will accumulate, and some calcium and magnesium ions will easily form precipitation, which will cause fouling and blockage of the equipment. water pollution

Method used

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  • Coal gasification grey water treatment zero-discharge system

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Embodiment Construction

[0024] The present invention is described in further detail below in conjunction with accompanying drawing:

[0025] refer to figure 1 , the coal gasification ash water treatment zero discharge system of the present invention comprises a slag water input pipeline, a medium pressure flash tank 1, a vacuum flash tank 2, a clarification tank 4, an evaporation furnace 18, a deaerator 13, and an evaporative cooler 19 , evaporation liquid separation tank 20, gray water heater 15, medium pressure flash evaporation cooler 16, medium pressure flash evaporation liquid separation tank 17, vacuum flash evaporation cooler 8, vacuum flash evaporation liquid separation tank 9 and vacuum filter 12; The slag water input pipeline is connected with the inlet of the medium pressure flash tank 1, the liquid outlet at the bottom of the medium pressure flash tank 1 is connected with the inlet of the vacuum flash tank 2, and the liquid outlet at the bottom of the vacuum flash tank 2 is connected with...

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Abstract

The invention discloses a coal gasification grey water treatment zero-discharge system which is characterized in that a liquid outlet in the bottom of a medium-pressure flash tank is communicated with an inlet of a vacuum flash tank, and a liquid outlet in the bottom of the vacuum flash tank is communicated with an inlet of a clarifying tank; an outlet in the side face of the clarifying tank is divided into two paths, one path is communicated with an inlet of an evaporation furnace, the other path is communicated with an inlet of a deaerator, a steam outlet of the evaporation furnace is communicated with an inlet of an evaporation liquid separation tank through an evaporation cooler, and a process water outlet of the evaporation liquid separation tank is communicated with an inlet of the deaerator. An outlet of the deaerator is communicated with an external washing tower through a heat absorption side of the grey water heater; a gas outlet in the top of the medium-pressure flash tank is communicated with an inlet of a medium-pressure flash liquid separation tank through a heat release side of a grey water heater and a medium-pressure flash cooler; a water outlet of the medium-pressure flash tank is communicated with an inlet of a deaerator; and the system can realize zero-emission treatment of slag water, and meanwhile, realizes resource recovery.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a zero discharge system for coal gasification ash water treatment. Background technique [0002] In the coal gasification chilling process technology, the syngas produced by the gasifier needs to be scrubbed before entering the downstream system. During the washing process, a large amount of process gray water will be produced, which contains a large amount of salt and acid gas dissolved in the gray water. In order to recycle this part of gray water, usually all the gray water slag water is sent to the primary water treatment unit for flash evaporation to remove acid gas, and then sedimentation and filtration to remove solid particles and reuse. However, after long-term circulation, the salt in the gray water system will accumulate, and some calcium and magnesium ions will easily form precipitation, which will cause fouling and blockage of the equipment. water pollution. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/34
CPCC02F1/06C02F1/20C02F9/00C02F2001/007C02F2103/34
Inventor 樊强贾会林许世森任永强陶继业刘刚李小宇刘沅陈智王鹏杰罗丽珍杨萍吴琼
Owner HUANENG CLEAN ENERGY RES INST
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