Process for recovering carbon from coal gasification ash residues
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A coal gasification ash and carbon recovery technology, which is applied in the petroleum industry, solid separation, solid fuel, etc., can solve the problems of complex process, high cost, and low carbon recovery rate, and achieve the goal of avoiding environmental pollution and improving resource utilization Effect
Inactive Publication Date: 2018-04-24
CHINA PETROLEUM & CHEM CORP +1
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[0008] The prior art has the following disadvantages: (1) the carbon recovery rate in the ash is low; (2) the process is complex and the cost is high
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Embodiment 1
[0031] The first step is pre-deashing and deslagging
[0032] The coal gasification ash with a carbon content of 15% is made into ash and the water flows into the material deashing tank by itself, and part of the fine ash is removed by means of hydraulic classification. A frequency converter is used to control the flotation feeding pump, and through frequency conversion technology, the amount of deashing can be flexibly adjusted online depending on the coal quality. The equipment is a reinforced concrete structure, which has two functions of flotation feeding buffer, deashing and slag removal. In the flotation feeding deashing tank, deashing is carried out by means of hydraulic classification, and the fine ash with an ash content of 55% is removed in advance, and the removal rate can reach 35%.
[0033] The second step coal slurry pretreatment
[0034] Input the coal slurry that has been pre-delimed and deslagged into the coal slurry preprocessor, add flotation agent to the ...
Embodiment 2
[0040] The coal gasification ash with a carbon content of 15% is subjected to deashing, slag removal and coal slurry pretreatment, the steps of which are the same as in Example 1, and will not be further elaborated here.
[0041] The third and fourth steps of flotation (rough selection first, then fine selection)
[0042] In this step, selectors with different numbers of chambers are selected for roughing and fine selection respectively. During the flotation process, in order to ensure that the amount of air per unit area is controlled at 0.5m 3 / m 2 / min. Carry out flotation then, its step is:
[0043] a. Rough selection
[0044] The pretreated coal slurry first enters the rough selection flotation machine, and then undergoes rough selection. The unit area of the rough selection jet flotation machine is 0.5m 3 / m 2 / min, the roughing time is 12 minutes, and the processing capacity per unit volume is 4m 3 / m 3 / h, sort out the rough coal with ash content of 10% and th...
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Abstract
The invention relates to a technical method for recovering carbon from coal gasification ash residues. According to the method, pre-deashing is conducted through a deashing pool, pre-processing is conducted through a coal slurry preprocessor, and rough concentration and fine concentration are conducted through a flotator. The technical method recovers clean coal from the ash residues, thereby being scientific and optimal and achieving energy saving and environment friendliness, and meanwhile, the problems of resource waste and high ash residue utilization difficulty of a coal gasification system caused by overhigh carbon content in the gasification ash residues when operation parameters such as coal types, the oxygen-coal ratio and furnace temperature are changed are effectively solved. Bymeans of the technical method for recovering carbon from the coal gasification ash residues, on the one hand, secondary utilization of residual carbon in the ash residues can be achieved, and on theother hand, the residues can reach the national pulverized ash standards of the level I, the level II and the level III. Coal dust in the ash residues is effectively recovered, the resource utilization rate is increased, resource utilization of low-carbon ash residues is further achieved, and meanwhile environmental pollution caused by stacking of a large amount of unrecycled ash residues can be avoided.
Description
technical field [0001] The invention relates to a process for recovering coal powder from coal gasification ash. technical background [0002] The coal gasification process mainly includes four units: raw material preparation, gasification, synthesis gas treatment and black water treatment. [0003] The raw material and the gasification agent (air, oxygen-enriched air or oxygen) react in the entrained bed gasifier with the participation of water vapor or water, and the crude synthesis gas (mainly composed of CO, h 2 and CO 2 etc.) contains solid particles such as coarse slag and fine ash, and the outlet syngas temperature is very high, generally 1200-1600°C. [0004] In order to remove particulate matter and recover heat, the treatment methods for the high-temperature synthesis gas at the outlet of the gasification chamber of the general entrained-flow gasifier are as follows: 1. Use the waste boiler process to produce high-grade medium-pressure steam through the sensible...
Claims
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