Heat accumulating type external hot coal middle-low temperature pyrolysis furnace

Abstract

The invention discloses a heat accumulating type external hot coal middle-low temperature pyrolysis furnace. The pyrolysis furnace is characterized in that a carbonization chamber (2) is isolated from air; the temperature of the carbonization chamber (2) is controlled to 500-800 DEG C by virtue of heat transferred from a heat accumulating type rapid-reversing high temperature air combustion chamber 1 in order to heat coal so as to continuously produce a solid fuel or semicoke; all of generated gas is the volatile of the coal, thus the gas has a high heat value; and after being purified, a part of generated gas returns back to the furnace to be used as the heat source of the pyrolysis furnace, and the rest part of gas is discharged. According to the invention, a heating technology of heat accumulating type rapid-reversing high temperature air combustion is introduced; the pyrolysis furnace disclosed by the invention has the advantages of high heat efficiency and simple furnace body structure; and co-production of high-quality solid fuel or semicoke, gas and tar is achieved, and the high-altitude emission of smoke generated by heating the gas meets a national environmentally-friendly standard.

Description

technical field [0001] The invention relates to a vertical pyrolysis furnace with a heat storage type fast-reversing high-temperature air combustion chamber, in particular to a heat storage type external heat coal medium-low temperature pyrolysis furnace. Background technique [0002] Coal pyrolysis technology has been well developed in Europe as early as the beginning of the 20th century. Coking is the field of coal processing and the industry with the most mature coal pyrolysis technology and the largest processing volume. Coal coking is a process in which coal is heated from the outside to a high temperature of 950-1050°C for high-temperature dry distillation and pyrolysis under the condition of isolating the air. However, the raw materials used in coal coking are limited to caking bituminous coal, and non-caking coal is not suitable. [0003] In recent years, a number of semi-coke (semi-coke) plants using long-flame coal and non-sticky or weak-viscosity gas coal as raw...

AI Technical Summary

Problems solved by technology

Large-scale mechanized coal mining makes it difficult to ensure that the lumpiness of coal materials can meet the requirements for the lumpiness of the process, which greatly reduces the ratio of lump coal after sieving raw coal, and some pulverized coal rates are as high as 40%. The utilization of coal The efficiency is only 60%, resulting in a large amount of pulverized coal having to be sold at a low price. In addition, the waste flue gas generated by internal heat is mixed with coal volatiles, which not only results in low calorific value of the produced gas, but also increases the load of subsequent cooling and purification, and increases operating costs.

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