System for simplifying coal-to-methanol production by adjusting carbon-hydrogen ratio with hydrogen and working method of system

Abstract

The invention discloses a system for simplifying coal-to-methanol production by adjusting a carbon-hydrogen ratio through hydrogen and a working method of the system, belonging to the technical field of coal chemical industry. The system mainly comprises a coal preparation unit, a coal gasification unit, a carbon-hydrogen ratio adjusting unit, a synthesis gas cooling unit, a low-temperature methanol washing unit, a unit for preparing methanol or methane from synthesis gas, a water treatment unit, a power generation unit, an electrolytic hydrogen production unit, a hydrogen collection unit, an oxygen collection unit, an air separation unit and a sulfur recovery unit. According to the invention, hydrogen obtained by electrolytic hydrogen production of renewable energy is used for adjusting the carbon-hydrogen ratio of the synthesis gas of the coal gasification unit and is directly used for preparing methanol or methane from the synthesis gas, and a conversion unit is not needed, so the load of the system is reduced, and operation cost is reduced; low-temperature waste heat of the coal gasification and synthesis gas cooling units is adopted for power generation, electric energy is provided for electrolytic hydrogen production, and extra power input is not needed, so energy consumption and production cost are reduced; and pure oxygen generated in an electrolytic hydrogen production process is used for the coal gasification unit, so the load of the air separation unit of the system is reduced, and production and operation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a system and a working method for simplifying coal-to-methanol by adjusting the carbon-hydrogen ratio with hydrogen. Background technique [0002] With the rapid development of coal chemical industry, CO in methanol production 2 Emissions are also increasing. In the coal-to-methanol process, the unit product CO 2 Emissions are 3.4 to 5.4 tons of CO 2 / ton of methanol. Under the same production scale, coal-based methanol production is nearly 8 times more carbon-emission than natural gas-based methanol production. Carbon emissions from coal-to-methanol production process accounted for 53.38%, carbon emissions from fuel combustion in thermoelectric boilers accounted for 36.25%, and carbon emissions from net purchased electricity consumption accounted for 10.36%. It can be seen that direct carbon emissions are the main CO 2 Emission source, CO 2 The...

AI Technical Summary

Problems solved by technology

It can be seen that direct carbon emissions are the main CO 2 Emission source, CO 2 There is a lot of space for emission reduction and utilization

Images