Comprehensive gasified grey water treatment and recovery device and method

Abstract

The invention belongs to a comprehensive gasified grey water treatment and recovery device and method. The device comprises a grey water clarifying tank connected with a gasification system, wherein a supernatant outlet of the grey water clarifying tank is connected with a grey water circulating system of the gasification system through a first inlet and fifth tee of the grey water tank and a 2# grey water pump; the third end of the fifth tee is connected with an inlet of one side of a dosing reaction tank through a 1# grey water pump and a 1# heat exchanger, an outlet of the other side of the dosing reaction tank is connected with the clarifying tank through a 1# lifting pump, an overflow port in the upper part of the clarifying tank is connected with a clear liquid tank, the clear liquid tank is connected with a sewage treatment system through a 2# lifting pump and a first tee, and the first tee is connected with a second inlet of the grey water tank through a second tee. The device has the advantages that ions Ca 2+, Mg 2+ and Si 2+ in grey water can be effectively removed on the premise of ensuring long-period stable running of a gasification device, the hardness of the grey water is reduced, the grey water is recycled, and the scaling rates of grey water equipment and pipelines are reduced.

Description

technical field [0001] The invention belongs to the technical field of gasification gray water utilization devices, in particular to a gasification gray water comprehensive treatment and recovery device and a treatment and recovery method. Background technique [0002] At present, the waste liquid treatment in the chemical industry has always been the bottleneck restricting the development of enterprises. The waste water produced by gasification devices accounts for 40-60% of the total waste water in chemical enterprises produced by coal gasification. The production process is as follows: the coal entering the furnace contains a certain amount SiO 2 , Fe 2 o 3 、Al 2 o 3 After being burned in the coal-water slurry pressurized gasifier, these substances enter the black water with the gas washing water, so that the concentration of suspended solids in the black water is 1000-4000mg / L, and the concentration of suspended solids in the gray water after flocculation treatment i...

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Problems solved by technology

[0003] The presence of Ca in the water system of the coal-water slurry gasification plant 2+ , Mg 2+ , Si 2+ etc. When they reach a certain concentration, they will react with the HCO in the water 3 － and CO 3 2－ Combined with the formation of carbonic acid precipitates and then scaling occurs, and in the production of CaCO 3 Scaling is the most common, CaCO at high temperature 3 Dissolved in water, CaCO when the water temperature drops 3 It resolves into crystal nuclei and grows continuously, and adheres to the inner wall of pipes and equipment to form scales. At the same time, the scales will wrap a large amount of ash, making the formation of scales faster and harder, causing more damage to the cleaning work. It is very difficult, especially after the scale flakes fall off, it will cause pipeline blockage and seriously affect the normal operation of the system

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