Black water coupling processing apparatus and method

Abstract

The invention discloses a black water coupling processing apparatus. The apparatus mainly comprises a solid-liquid separation unit used for removing solid particles from black water to form gray water and a gray water evaporation unit used for removing mineral matters from the gray water. The invention further discloses a black water coupling processing method, which comprises steps: 1) separating solid particles from black water through solid-liquid separation technology to form gray water; and 2) separating mineral matters from gray water through evaporation technology to obtain purified gray water. Solid-liquid separation technology and evaporation technology are well combined to be applied to process black water from a coal gasification apparatus. Compared with a common black water processing process, the method allows safety and stability of operation of a black water processing apparatus to be improved, the technical process to be simplified, area occupation and difficulties of arrangement, operation and maintenance of the apparatus to be reduced, and the cost for treating black water to be reduced.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to the treatment of black water in a coal gasification device. Background technique [0002] my country's basic national conditions of being rich in coal, poor in oil, and low in gas determine that the economical, efficient, and clean utilization of coal is crucial to ensuring the sustainable development of the economy, society, and ecological environment, and national energy security. role. Coal gasification technology, especially entrained-bed coal gasification technology, is one of the core technologies of modern coal clean conversion, and it is coal-based chemicals (methanol, dimethyl ether, natural gas, etc.), coal-based liquid fuels, advanced IGCC power generation, multiple The basis of cogeneration systems, hydrogen production and other process technologies is the common technology, key technology and leading technology of these industries. [0003] The typical chilled ...

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Problems solved by technology

The disadvantages of this black water treatment process are: 1) The process is long, the equipment is large, the floor area is large, and the layout is difficult; 2) Because the heat of the vacuum flash steam needs to be removed by circulating water, the energy consumption is high , the consumption of circulating water is large; 3) Since the soluble impurities in gray water, such as chloride and hardness, are not removed, they will gradually accumulate in the system with the operation of the device, resulting in gasification and black water system scaling, Blockage and wear make maintenance and operation more difficult, which brings great pressure to the long-term stable operation of the gasification device; 4) The amount of gray water sent out is large, and the system needs to replenish more fresh water and desalinated water; 5 ) It is necessary to add additional water quality treatment agents to alleviate the scaling and wear problems of black water and gray water systems, which increases the operating cost of the device

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