Method for preparing gasification coal water slurry through matching of dried pulverized coal and semicoke

• Main Authors: CHU MO, ZHAO MAN, QU YANG
• Format: Patent
• Language: English
• Published: 18.11.2015
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMISTRY; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

The invention relates to a method for preparing gasification coal water slurry through matching of dried pulverized coal and semicoke and is applicable to technological processes for increasing brown coal water slurry concentration through brown coal drying and pyrolysis processing. According to the method, the goal is preparation of high-concentration brown coal water slurry, the slurry is prepared from a drying product and a pyrolysis product through hierarchical optimization, and the concentration of the coal water slurry is up to 59%-65%. The principle for obtaining the high-concentration brown coal water slurry is as follows: the dried pulverized coal is poorer in grindability, higher in activity, suitable to be used as a coarse powder component of a slurry producing raw material and capable of effectively increasing the concentration of the coal water slurry; the slurry ability of the semicoke is greatly improved, and the semicoke is good in grindability, poorer in reactivity and suitable to be used as a fine powder component of the slurry producing raw material. The dried pulverized brown coal is used as the coarse powder component for slurry production, the defect that the slurry ability of dried brown coal is poorer can be overcome, the ore grinding energy consumption is reduced, the reactivity is good, and the gasification reaction time is required to be prolonged due to increase of the grain size. Meanwhile, coarse and fine grains in the coal water slurry have similar gasification time in an entrained-flow bed, and the carbon loss ratio is low.