Coupling technology of thermoelectric methanol from coals

Abstract

The invention discloses a coupling technology of thermoelectric methanol from coals. In the coupling technology, a plasma gasifier is coupled with a thermal power plant system, the plasma gasifier isused to replace a traditional gasifier, the electric energy and coal powder required for the plasma gasifier can both be directly acquired from a power plant, a hydrogen generation station of a thermal power plant provides H2 to a methanol generation system, and the problem of energy and water consumption caused by using gas-water conversion device is avoided; expect being used for synthesizing methanol, unreacted synthesis gas after being gasified is introduced into a boiler of the thermal power plant to increase the quantity of heat production and save coals; discharge gas of the gasifier contains a great quantity of sensible heat, a part of the sensible heat is used for producing high-temperature and high-pressure vapour to be provided to the gasifier after being recovered or preheat feedwater of the boiler, and the air extraction quantity of a steam turbine is reduced; a gas purification system recovers CO2 produced in the process, and carbon emission is reduced; and according to the method, a gas-water reaction system is cancelled, the water consumption is reduced, the heat is recovered, the energy utilization ratio is improved, and the coal consumption is reduced.

Description

Technical field [0001] The invention relates to a combined process of coal polygeneration, in particular to a system combined process method of coal-to-heat / electricity / methanol. Background technique [0002] Methanol is an important chemical raw material, and it can also be used as a substitute for liquid fuel to alleviate the energy crisis. At present, the annual output of methanol is very large, which greatly meets the demand for methanol for downstream methanol products. [0003] At present, methanol is mainly produced through natural gas, coal, heavy oil, etc. The production of methanol with natural gas as a raw material is the one with the least pollution and the lowest cost in the production of methanol. However, the reserves of natural gas are small and the price is high. Petroleum also has the same problem. Two kinds of resources, coal has huge reserves in our country, and the use of coal chemical technology is an effective way to achieve high-efficiency and clean utilizat...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned prior art, the present invention provides a coal-to-thermoelectric methanol coupling process, the main purpose of which is to deal with coal slag after gasification, a large amount of sensible heat that cannot be effectively utilized, low-load operation efficiency of thermal power plants, and energy consumption in the transformation process Water consumption and other issues

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