Pyrolysis system for pyrolysis of broken coal, and device and method for producing semicoke, tar and coal gas by pyrolysis of broken coal

Abstract

The invention discloses a pyrolysis system for pyrolysis of broken coal, and a device and a method for producing semicoke, tar and coal gas by pyrolysis of broken coal. The pyrolysis system comprises a pyrolyzer, a particle size classifier, a distributing cabin, a cyclone separator, a small hopper, a large hopper and a discharge tube, wherein the pyrolyzer, the distributing cabin, the small hopper and the large hopper are tightly connected; the small hopper and the large hopper are connected below the distributing cabin; the particle size classifier is connected to the outlet of the pyrolyzer and is arranged inside the distributing cabin; the cyclone separator is arranged inside the distributing cabin, and used for separating pyrolysis gas discharged by the pyrolyzer to obtain solid particles and purified pyrolysis gas. The device comprises the pyrolysis system. The tar obtained by adopting the method is high in yield and high in quality, the coal gas is high in effective components and high in heating value, the yield of the semicoke is improved, the whole energy efficiency is high, and the device can run within a long period.

Description

technical field [0001] The present invention relates to a pyrolysis system for pyrolysis of crushed coal and a device and method for producing semi-coke, tar and gas by pyrolysis of crushed coal, in particular to a pyrolysis system for pyrolysis of crushed coal, including the pyrolysis system A device for producing semi-coke, tar and gas by pyrolysis of crushed coal and a method for producing semi-coke, tar and gas by pyrolysis of crushed coal on the device. Background technique [0002] At present, there are a large number of cheap crushed coal resources in China, which urgently need efficient and clean conversion and utilization. Although relevant research work has been carried out for many years at home and abroad, there is still no mature technology available. At present, the pulverized coal pyrolysis technology is mainly based on solid heat carrier, and most of them use moving bed or fluidized bed pyrolysis reactor. A large number of investigations and analyzes have sh...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the pyrolysis gas produced during the pyrolysis process must be transported to a dust removal device other than the pyrolyzer for dust removal. It is inevitable that due to the decrease of the ambient temperature, the tar vapor in the pyrolysis gas will condense, which will affect the smoothness of the pipeline. It also reduces the tar yield; the pyrolyzer is a moving bed pyrolyzer, it is difficult to ensure that the dry coal and the semi-coke heat carrier are evenly mixed, the processing capacity of a single device is limited, and the production efficiency is low; the rotary dryer uses hot semi-coke and semi-coke Direct countercurrent contact heat exchange of raw coal, co-current contact heat exchange between hot flue gas and raw coal to complete drying of raw coal and cooling of hot semi-coke, the manufacture of double-sleeve rotary dryer is complicated and difficult to control during operation; Self-produced gas is used as the heat source of the system, and the high-value gas is burned directly, which reduces the economy of the system

The disadvantage of this method is: the pyrolysis gas discharged from the pyrolysis rotary kiln enters the tail gas treatment system without separating the dust, so that the dust content in the obtained tar is high, which reduces the quality of the tar; the self-produced gas is used as the system The high-value gas is burned directly, which reduces the economy of the system; in addition, the drying process of the rotary kiln adopts co-current direct contact drying, and the drying temperature of coal is low, which will lead to an increase in the amount of semi-coke heat carrier. The corresponding system load increases

[0005] It can be seen that the prior art has the problems of high dust content in tar products and waste of gas products. In addition, tar is easy to condense in the pipeline and affects the long-term stable operation of the device.

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