Low-rank coal pyrolysis furnace and graded utilization process thereof

Abstract

The invention relates to a low-rank coal pyrolysis furnace and a graded utilization process thereof, and belongs to the technical field of coal pyrolysis. The pyrolysis furnace particularly comprisesa furnace body and a plate type material conveying mechanism arranged in a length direction of the furnace body, wherein the furnace body is of a closed heat-preserving structure; a low-rank coal feeding bin is arranged at the upper part of one end of the furnace body; a coal ash discharge pipe is arranged at the lower part of one end of the furnace body; the furnace body is internally provided with a drying section, a preheating heating section, a dry distillation section and a cooling section; heat insulating walls are respectively arranged between the drying section and the preheating heating section, and the dry distillation section and the cooling section; a material passage is left between the heat insulating walls and the plate type material conveying mechanism; hot carrier gas inlet pipes, cold coal gas inlet pipes, dry gas collecting pipes and preheating gas collecting pipes are further formed in the furnace body; the hot carrier gas inlet pipes communicate with the dry distillation section; the cold coal gas inlet pipes communicate with the cooling section; the dry gas collecting pipes communicate with the drying section; and the preheating gas collecting pipes communicate with the preheating heating section. The low-rank coal pyrolysis furnace is simple in structure and convenient to use, integrates drying, preheating and heating, pyrolysis and cooling in one, and recycles the pyrolysis gas.

Description

technical field [0001] The invention relates to a low-rank coal pyrolysis furnace and its graded utilization process, belonging to the technical field of coal pyrolysis. Background technique [0002] my country is a country poor in oil, less in gas, and relatively rich in coal. The remaining exploitable reserves of oil are only 2.4 billion tons, and oil backup resources are seriously insufficient. In 2013, my country's crude oil imports exceeded 280 million tons. The degree reaches 58%. At present, the economic development of the Asian region has greatly increased the demand for petrochemical products. Similarly, many petroleum and chemical products in my country still need to rely on imports to fill the shortage. However, oil resources are basically monopolized by powerful countries. With the increasing international energy demand, petrochemical products Production costs are also increasing. In contrast, my country's coal reserves have been detected to be 1 trillion tons, a...

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Problems solved by technology

[0003] At present, the utilization of coal in my country is mainly based on single utilization, including direct combustion, gasification and liquefaction with low utilization efficiency.

In order to improve the high conversion rate of coal, complex processes and relatively harsh operating conditions are often required, resulting in complex conversion processes, large equipment, and a significant increase in investment and production costs

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