Crude coal gas purifying method and crude coal gas purifying device
A purification device and crude gas technology, applied in the field of coal gasification, can solve the problems of secondary pollution, complex purification process, large equipment investment, etc., and achieve the effect of less equipment investment, simple process, and reduced waste water output
Active Publication Date: 2015-03-25
ENN SCI & TECH DEV
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Problems solved by technology
[0004] This traditional purification process directly sprays circulating ammonia water for cooling, which will produce a large amount of phenol-containing wastewater and cause secondary pollution; in addition, the purification process is complicated and the investment in equipment is large
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Embodiment
[0109] Such as figure 2 As mentioned above, raw coal and raw gas undergo a coal gasification reaction in the gasifier 70 to produce high-temperature crude gas containing oil and ash; the crude gas is purified and cooled at the outlet of the gasifier 70, and the gas is quenched, and the temperature drops, stopping The side reaction improves the yield and quality of tar in the crude gas. Since the crude gas at the outlet of the gasifier 70 entrains a large amount of solid particles and has a relatively high dust content, in order to avoid the influence of the dust on the after-treatment system after chilling, it is first necessary to remove the dust. The cyclone separator 51 is initially used to remove the large-particle dust with a particle size greater than 10 μm, which usually accounts for >80% of the mass fraction of dust in the crude gas, and then the remaining very small amount of large-particle dust and large particles are removed through the high-temperature filter 52. ...
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Abstract
The invention discloses a crude coal gas purifying method and a crude coal gas purifying device, relating to the technological field of coal gasification. According to the crude coal gas purifying method and the crude coal gas purifying device, crude coal gas can be cooled in a grading manner to obtain high-quality oil and high-quality purified coal gas, the purification process is simple and the equipment investment is low. The crude coal gas purifying method comprises the following steps: (1) directly spraying and cooling crude coal gas by using heavy tar as quenching oil so as to wash dust in the crude coal gas; (2) spraying crude coal gas with light oil so as to recover heavy tar and part of light oil in the crude coal gas; and (3) re-cooling the crude coal gas by a washing process to remove residual light oil and foreign gases in the crude coal gas, thus obtaining the purified coal gas. The crude coal gas purifying method and the crude coal gas purifying device are suitable for coal gasification post-processing process.
Description
technical field [0001] The invention relates to the technical field of coal gasification, in particular to a crude coal gas purification method and device. Background technique [0002] Raw coal gasification or pyrolysis to obtain clean fuels or other primary chemical products has broad application prospects in our country. The raw coal gas produced during the gasification or pyrolysis process contains a large amount of dust, water vapor and tar, as well as H 2 S and NH 3 and other impurity gases are produced. In order to produce clean gas that is suitable for sale or meet downstream processes, and consider the recovery of tar by-products in the crude gas, the crude gas must be purified. [0003] At present, the traditional purification process includes cooling, dust removal, washing and other main processes. Taking traditional coke oven gas as an example, the process of gas purification, dust removal and tar recovery is to directly spray circulating ammonia water into h...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C10K1/02C10K1/06C10K1/10C10K1/16
CPCY02P20/129C10K1/02C10K1/002C10K1/004C10K1/04C10K1/085C10K1/101C10K1/16C10K1/18
Inventor 汪国庆周三郑征马志超方科学聂永广
Owner ENN SCI & TECH DEV