A low-rank coal fast pyrolysis device

Abstract

A fast pyrolysis device for ow-rank coal comprises a plurality of vertical pyrolysis chambers and heating chambers which are arranged at intervals alternately side by side, wherein each heating chamber is divided into multiple horizontal flues; heating gas in every two adjacent heating chambers flows reversely; two columns of stirrers are arranged in each vertical pyrolysis chamber, heating gas between the two columns of stirrers flows reversely, and heating gas in each column of stirrer and the heating chamber adjacent to the stirrer flows reversely; stirring pipes are arranged in the middleof each stirrer, shaft drums and beam barrels are arranged at two ends of the stirring pipes, gears driving the stirrers to rotate are arranged on the beam barrels on one sides, and every two columnsof stirrers rotate oppositely; a feed device is mounted at the top of each vertical pyrolysis chamber, and a discharge device is mounted at the bottom. Internal and external dynamic heating and dynamic and static integration are adopted, so that the defects of low oil-gas production rate, high difficulty of separation of oil-gas dust, poor quality, difficult control after pollution and the like ofa direct heating method are overcome; the defects of small static heating area, large thermal resistance, non-uniform heating, low capacity and the like of an indirect heating method are overcome.

Description

technical field [0001] The invention relates to a low-rank coal rapid pyrolysis device with internal and external dynamic heating, which belongs to the field of coal cracking and is used for pyrolysis of low-rank pulverized coal, and can also be used for pyrolysis or drying of solid organic matter. Background technique [0002] Low-rank, high-volatile coal (referred to as low-rank coal) accounts for about 55% of the total coal in my country. Low-rank coal mainly includes lignite and long-flame coal. Low-rank coal has high volatile and moisture content, and ash and sulfur content Low. Generally, 8-12% of tar and 12-16% of high calorific value gas can be recovered after pyrolysis of low-rank coal, and 65% of upgraded coal (or semi-coke) can be produced. Low-rank coal can recover valuable chemical products such as tar and gas through rapid pyrolysis, thus reducing coal cost. When the burning speed of upgraded coal decreases, the content of nitrogen oxides in flue gas will decr...

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Problems solved by technology

Because the coal material is not in direct contact with the heat carrier, the heating area is often insufficient, the thermal resistance of the static heating coal material is large, the heating is uneven, the heat transfer efficiency is low, the pyrolysis time is long, etc., and the production capacity is generally low.

Horizontal rotary kiln indirect pyrolysis devices are mostly used. Rotary kiln fast pyrolysis device has horizontal rotating outer wall heating, equipment sealing is difficult, maintenance is large, and production capacity is low; vertical furnace fast pyrolysis device static heating area Small, large thermal resistance, low production capacity

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