A polygeneration method for joint conversion of multiple coal types

Abstract

The invention discloses a joint-converted polygeneration method for multiple coal types. The method comprises the following steps: (1) subjecting coking coal to coal washing so as to obtain coal gangue, middlings and washed coal, and subjecting the coal gangue, limestone and feldspar to processing, so as to obtain decorative wall panels; (2) carrying out coal blending on gasified coal and the middlings, and then, subjecting the blend to a reaction with oxygen gas, so as to obtain crude synthetic gas; (3) subjecting gas coal and / or coking coal and the washed coal to coal coking so as to obtain coke oven gas, coal tar and coke, converting the coke oven gas so as to obtain crude synthetic gas, and hydrogenating the coal tar so as to obtain liquefied petroleum gas, naphtha and diesel oil; (4) subjecting the crude synthetic gas to conversion and purification, so as to obtain purified synthetic gas; (5) subjecting the purified synthetic gas to Fischer-Tropsch synthesis so as to produce Fischer-Tropsch intermediate oil, Fischer-Tropsch synthetic water and Fischer-Tropsch exhaust gas, subjecting the Fischer-Tropsch synthetic water to Fischer-Tropsch synthesis treatment so as to obtain chemicals, subjecting the Fischer-Tropsch exhaust gas to exhaust gas treatment so as to obtain fuel gas and liquefied petroleum gas, and subjecting the Fischer-Tropsch intermediate oil to processing so as to obtain liquefied petroleum gas, naphtha and diesel oil. According to the method, the comprehensive utilization of the multiple coal types is achieved; the graded utilization of coal of multiple ranks is achieved through coal washing.

Description

technical field [0001] The invention relates to a polygeneration method for joint conversion of multiple coal types. Background technique [0002] China is a major coal producer and consumer in the world. In 2014, China's raw coal output was 3.874 billion tons, which was 2.5% lower than the same period last year, but still accounted for 47.45% of the world's raw coal output, ranking first in the world. Coal accounts for about 70% of China's primary energy consumption, and coal for thermal power generation accounts for 40% to 43% of the total coal consumption. China's coal-fired power generation will continue to grow and will gradually replace fuel-fired power generation. The scale of coal gasification, coal liquefaction and other coal chemical production will also increase year by year. It can be seen that coal is still an important part of China's energy at this stage, and the energy pattern dominated by coal will be difficult to change for a long time. [0003] China's c...

AI Technical Summary

Problems solved by technology

However, the raw materials in the existing polygeneration systems or methods generally use a single type of coal, and do not fully consider the comprehensive utilization of multi-type coal and multi-rank coal.

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