One Question per Day: Methanol Technology Discussion Edition 20180712

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Last edited by Small and on 2018-7-12 19:27. Brief overview of the characteristics of dry coal powder feeding: Coal powder particles with sizes between 20 and 90 microns are transported using inert gases, with high-pressure nitrogen or carbon dioxide being used to feed them into the gasification furnace. CO2 can undergo a reduction reaction with C to form CO, absorbing heat in the process, while nitrogen does not participate in the reaction. That is, CO2 can serve both as a carrier gas and as a reactant gas. Therefore, after successful driving of the process, the CO2 generated as a by-product of low-temperature methanol washing is utilized; after pressurization, it replaces N2 as the gas used for transporting pulverized coal. Some of this CO2 undergoes a reduction reaction with the pulverized coal at high temperatures to produce CO, thereby increasing the content of the useful gas CO in the syngas. This approach enables an increase in methanol production while reducing greenhouse gas emissions of CO2. Problems existing: 1. Due to the incorporation of CO2, the CO2 content in the syngas is only of reference value and cannot directly reflect the operating conditions of the gasifier, posing certain difficulties for process operation. 2. Due to the different densities of CO2 and N2, transporting pulverized coal can affect the measurement accuracy of flow meters, resulting in a slight discrepancy between the actual flow rate of the pulverized coal and the calculated flow rate.