Dry quenching gas regulation method of coal internal heat low temperature pyrolysis

Abstract

The invention discloses a dry quenching gas regulation method of coal internal heat low temperature pyrolysis. The method comprises: performing tar separation and collection to gas which is generated from a pyrolysis segment through pyrolysis, returning a part of cool purified gas to a quenching segment, allowing heat transfer to be carried out between hot semi-coke in the quenching segment and the part of cool purified gas to reduce the temperature of semi-coke to a non-reignition temperature, and discharging the hot gas; leading the hot gas after heat transfer from the quenching segment to the pyrolysis segment; leading a combustion-supporting gas from micropores of a lattice wall or a gas distribution channel to the pyrolysis segment, allowing the combustion-supporting gas to meet the hot gas for combustion; and mixing high-temperature gas produced from combustion with uncombusted hot gas to form high-temperature mixed gas meeting the temperature and flow of low temperature pyrolysis requirements, and performing heat transfer between the high-temperature mixed gas and coal in the pyrolysis segment so as to carry out coal pyrolysis. According to the method, in a situation that the circulating gas amount in the pyrolysis segment is basically kept constant, the gas circulating amount in the quenching segment is further increased, so that the quenching effect is ensued, and the physical heat of semi-coke can be fully used, and therefore, the energy saving effect is good. According to the method, since no dependent combustor, combustion gas blower fan, pipeline or valve is required, so that the system is further simplified.

Description

technical field [0001] The invention relates to the technical fields of coal chemical industry, new energy and environmental protection, and in particular to a coke dry quenching gas control method of internal thermal low-temperature dry distillation of coal. Background technique [0002] my country's Shanxi, Shaanxi, Ningxia and Inner Mongolia regions are rich in low-metamorphic coal resources. This type of coal is weakly sticky and non-sticky coal with high volatile content and high tar content. Low-temperature dry distillation can obtain gas and semi-coke while separating tar. (Semi-coke), which is an effective method for quality-based comprehensive utilization or coal upgrading, has developed rapidly in recent years. According to reports, in Shanxi, Shaanxi, Ningxia and Inner Mongolia, as well as Xinjiang, Yunnan and Guizhou, the production capacity can reach more than 60 million tons / a, and it has become the main coal conversion industry in these places. [0003] For se...

AI Technical Summary

Problems solved by technology

[0005] One is that the internal heat adopts the combustion heating method of air and gas in the furnace, and the combustion waste gas is mixed into the gas, which not only reduces the calorific value of the gas, but also increases the processing capacity of the purification system, and the low calorific value gas lacks a reasonable high additional value of the gas. value utilization;

[0006] The second is to use water spray or water immersion to quench coke, which not only wastes precious local water resources, but also the physical heat of semi-coke is consumed in vain and has not been effectively utilized.

[0007] Third, it is difficult to separate tar and dust;

[0008] Fourth, crushed coal cannot be put into the furnace for dry distillation;

[0009] Fifth, it is difficult to treat dry distillation wastewater

Insufficient gas and gas blower capacity to process

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