System and process for preparing methyl alcohol through coke-oven gas-assisted coal gasification

Abstract

The invention discloses a system and a process for preparing methyl alcohol through coke-oven gas-assisted coal gasification. The system comprises a water-coal-slurry preparation unit, a coal gasification unit, a synthesis gas purification unit, a methyl alcohol synthesis unit, a coke-oven gas purification and separation unit, a triple reforming reaction unit and a gas mixer, wherein the water-coal-slurry preparation unit, the coal gasification unit, the synthesis gas purification unit and the methyl alcohol synthesis unit are sequentially connected with one another. According to the system and the process, effective utilization of coal resources is achieved by complementary utilization of elements of coal and the coke-oven gas and the waste of active elements and energy consumption, caused by a component adjustment operation, can be avoided; and since carbon dioxide and coke-oven gas are used by integration of the triple reforming reaction unit, the operation units are relatively simple, the reaction process is relatively strong in flexibility, and the equipment investment is relatively low.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and in particular relates to a coke oven gas-assisted coal gasification system and process for methanol production. Background technique [0002] Methanol is an important chemical basic product and an important raw material for the manufacture of various organic products such as formaldehyde, acetic acid, methyl chloride, methylamine and dimethyl sulfate, as well as C1 chemicals such as ethylene and propylene. In 2010, my country's methanol production capacity reached 37.57 million tons, with an output of 15.75 million tons, making it the world's largest producer of methanol. At present, my country mainly uses coal as raw material to produce methanol. [0003] The existing coal-to-methanol process has high energy consumption and CO 2 There are two main problems with large emissions. CO 2 The main reason for the large emissions and low energy efficiency is that the hydroge...

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Problems solved by technology

However, the methanol synthesis gas produced by this process needs to be composed of four strands (coal gasification synthesis gas, dry weight integrated gas, wet weight integrated gas, hydrogen), and the operation flexibility is small, and the system flexibility is low. The composition of the raw materials changes, and the process may not be able to obtain the synthesis gas that meets the hydrogen-to-carbon ratio required for methanol synthesis; and the introduction of too many operating units also greatly increases the equipment investment of the process

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