A method for pre-drying, pulverizing and conveying raw coal and its special processing system

Abstract

The invention discloses a method for predrying, powdering and conveying feed coal and a special processing system thereof. The method comprises the following steps that 1, coom in a predrying feeding bin is conveyed into a fluid bed drying oven to be predried, and the obtained predried coom enters a powdering feeding coal bunker; 2, the predried coom is fed into a coal pulverizer from the powdering feeding coal bunker to be pulverized to obtain pulverized coal to be fed into a pulverized coal bunker; 3, the pulverized coal is conveyed into a high-pressure pulverized coal tank through a solid pulverized coal conveying pump. The special processing system comprises the feeding bin, the fluid bed drying furnace, the powdering feeding coal bunker, the coal pulverizer, the pulverized coal bunker, the solid pulverized coal conveying pump and the high-pressure pulverized coal tank which are connected in sequence. The feed coal drying effect is good, and energy is saved; the coal pulverizing and drying operation is safer, the pulverized coal conveying energy consumption is small, and efficiency is high.

Description

technical field [0001] The invention relates to a method for pre-drying, pulverizing and transporting raw coal and a special treatment system thereof, belonging to the field of coal chemical industry. Background technique [0002] Entrained bed pulverized coal pressurized gasification technology is one of the most advanced coal gasification technologies today. It has technical advantages such as wide adaptability of coal types, low raw material consumption, high carbon conversion rate, high cold gas efficiency, long equipment life, and easy scale-up. , the prepared synthesis gas can be used as raw material gas for coal direct liquefaction and indirect liquefaction process, fuel gas for IGCC power generation, and can also be used to produce synthetic ammonia, methanol, dimethyl ether, etc. For raw coal with low water content, the current conventional raw coal pretreatment process mainly includes raw coal crushing, coal grinding and drying, and pulverized coal pressurized tran...

AI Technical Summary

Problems solved by technology

The traditional pulverized coal conveying device not only has a complex structure, but also consumes a lot of energy and gas, and the synthesis gas from the gasifier has a high content of nitrogen or carbon dioxide

This has a great impact on the efficiency of the downstream production of methanol and coal-to-oil, etc., and to a certain extent weakens the advantages of reduced oxygen consumption and coal consumption brought about by dry pulverized coal gasification

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