Daily Question: Methanol and Purification Technology Forum Edition 20191018

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Additional information is welcome on the effects of excessively high or low temperatures in the vaporization furnace on the system. Excessively high temperatures can lead to: (1) a decrease in the viscosity of the slag, increased fluidity of the slag, and reduced ability of the slag to protect the furnace walls, which in turn reduces the service life of the furnace’s refractory lining. (2) Excessively high temperatures reduce the effective components in the syngas, increase the carbon dioxide content, and disrupt the oxygen-to-fuel ratio. (3) Excessively high temperatures also increase the thermal load on the system, leading to an increase in the water vapor ratio. It not only increases the burden on the downstream system but also affects the composition of the gas. (4) Excessively high temperatures increase the fine ash in the sludge; this is due to an increase in fine carbon black in the water vapor, which makes it difficult to remove and thus affects water quality. Effects of too low temperature: (1) The viscosity of the ash increases, making it difficult to remove the ash; this can lead to blockages at the ash outlet, resulting in increased resistance in the gasification furnace and even forcing a shutdown of the furnace. (2) The carbon conversion rate decreases, gas production falls, and energy consumption increases.