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A treatment method and technology of coal gasification, which are applied in the fields of gaseous effluent wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. The problem of high residual carbon content
Inactive Publication Date: 2016-02-03
张晓峰
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[0012] In view of the above-mentioned problems and deficiencies in the prior art, the object of the present invention is to provide a coal gasification ash water treatment method, which effectively solves the problem o
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Embodiment 1
[0033] figure 2 A process flow chart of the treatment method of a kind of coal gasification ash water of the present invention is provided, and it comprises the following steps
[0034] 1) Flash concentration
[0035] The black water discharged from the gasification furnace and scrubber is concentrated by 2-stage or 3-stage flash evaporation to recover heat and separate acid gas;
[0036] 2) Concentration and separation of black water
[0037] The black water after flash evaporation enters the concentrator. The concentrator has two functions, one is to concentrate black water to facilitate flotation; the other is to separate floating beads;
[0038] In the concentrator, the floating beads float up, and the other components sink because the density is greater than water, so that the black water is divided into two layers, the upper layer is the floating bead slurry, and the lower layer is the concentrated black water. Concentrated black water enters the flotation machine f...
Embodiment 2
[0048] image 3 Provide the working principle diagram of the specific implementation device of the treatment method of coal gasification ash water of the present invention, comprise the steps:
[0049] 1) Flash concentration
[0050] The black water from the Texaco gasifier and washing tower passes through the high-pressure flash tower 1, the low-pressure flash tower 2 and the vacuum flash tower 3, and then enters the concentrator 4 after being flashed and decompressed to separate the acid gas.
[0051] 2) Concentrate and separate floating beads
[0052] Under the agitation of the concentrator 4, the floating beads float up and overflow, and then enter the floating bead extraction device 5 to extract the floating beads. The black water concentrate in the lower layer of the concentrator enters the flotation device 6 .
[0053] The clear liquid that has extracted floating pearl enters gray water tank 9.
[0054] 3) Flotation residual carbon
[0055] The mechanical stirring ...
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Abstract
The invention relates to a coal gasification ash water treatment method. The problem that in the prior art, gasified fine residue is too high in carbon residue and reused ash water contains plenty of suspended particles is solved mainly. The ash water treatment method comprises the steps that black water coming from a gasification furnace and a washing tower undergoes two-stage or three-stage flash evaporation and concentration and then enters a thickener; under the stirring effect, the black water coming from the thickener is divided into two layers, floating bead slurry of the upper layer overflows and enters an ash water circulation system or a sedimentation tank after floating beads are separated; the concentrated black water of the lower layer enters a carbon residue classifier, carbon residue undergoes floatation, tailing slurry of a lower layer of a floatator; supernatant of a settling tank enters the ash water circulation system, and lower layer turbidity solution of the settling tank enters a filter to be dehydrated to obtain filter cake (gasified fine residue). By adopting the ash water treatment method, the carbon residue content of the coal gasified fine residue can be reduced, the utilization of the gasified fine residue is facilitated, and the suspended particles in reused ash water can be reduced.
Description
technical field [0001] The invention relates to a coal gasification ash water treatment method, in particular to an ash water treatment method for entrained gas wet slag removal. Background technique [0002] In the entrained bed gasifier, coal and gasification agent react chemically, which can transform coal into fuel gas or chemical synthesis gas. At present, the Texaco gasifier process using coal water slurry as raw material and the Shell gasifier process using dry pulverized coal as raw material are often used. Both gasification processes can operate safely and stably, but there are still some problems to be solved in their gray water treatment methods. [0003] The fuel gas or synthesis gas produced from the coal gasifier is called crude gas, which contains a large amount of fly ash. At present, the relatively mature crude gas purification process is a wet purification process, which uses water to quench and wash the crude gas to remove fly ash and acid gas in the cru...
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