System and method for producing coal tar gas by pyrolysis of low-rank coal in vertical furnace

Abstract

The invention belongs to the technical field of coal chemical industry, and relates to a system and method for preparing coal tar and a coal gas by low-rank coal pyrolysis in a vertical furnace. The system comprises a drying system, a pyrolysis furnace system and a cooling blowing system; the drying system communicates with the pyrolysis furnace system; and the pyrolysis furnace system communicates with the cooling blowing system and the drying system. The system and method for preparing the coal tar and the coal gas by the low-rank coal pyrolysis in the vertical furnace provided by the invention have the advantages that adaptability of raw materials is strong, a calorific value of the coal gas is high, the coal tar has less impurities, semicoke has good quality and the running costs are low.

Description

Technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to a coal tar gas preparation system and preparation method, in particular to a system and method for preparing coal tar gas by pyrolysis of low-rank coal in a vertical furnace. Background technique [0002] The pyrolysis of low-rank coal is a key step in the grading and utilization of coal. Through pyrolysis, low-rank coal can be used in cascade and qualitative ways to increase the added value of the product and make the coal cleaner. [0003] There are various ways of low-rank coal pyrolysis, according to the form there are vertical furnace pyrolysis process, rotary kiln pyrolysis process, fluidized bed pyrolysis process and entrained bed pyrolysis process. According to the heating method, there are direct heating pyrolysis process and indirect heating pyrolysis process. Among them, direct heating includes gas heat carrier, solid heat carrier and gas solid heat carrier; indi...

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Problems solved by technology

Using the external heating vertical furnace derived from high-temperature coking for coal pyrolysis, the adaptability of raw materials is strong, the quality of gas semi-coke products is good, the yield of tar is moderate, and the operating cost is low, which is a good solution to the problem of dust removal of high-temperature raw gas, but The use of a large number of refractory materials results in huge investment, and problems such as expansion cracks of refractory materials cannot be solved well, and the thermal efficiency needs to be further improved.

[0004] The carbonization chamber of a vertical furnace for carbonization of low-rank coal with the application number 201410153775.2 of China Metallurgical Coking Resistance Engineering Technology Co., Ltd. is a representative of the externally heated vertical furnace. The combustion chamber and the pyrolysis chamber (carbonization chamber) are arranged at intervals. There is a heat storage and heat exchange room next to it, all of which are built with high-quality refractory bricks. The raw materials of this device have good adaptability, high gas calorific value, low impurities in coal tar, good quality semi-coke products, and low operating costs. However, the investment is too large, and the problem of gas leakage in expansion cracks of refractory materials cannot be solved well

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