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What does the steam-to-air ratio mean? What is being compared to what? Where does the steam come from, and where is it mixed in? Thank you
It is the ratio of water vapor to dry process gas. The process steam for weathering is specifically supplied, whereas in coal chemical processing it is generated directly by the gasification furnace. The water-to-gas ratio (H2O/dry gas) or water-to-carbon ratio (H2O/CO) is an important control parameter in the shift operation. From the equilibrium relationship, it can be seen that an increase in the water-to-gas ratio raises the equilibrium conversion rate of CO, which helps to reduce the residual CO content, suppress side reactions, accelerate the progress of the conversion reaction, and also facilitates the control of the bed temperature. However, an excessively high water vapor ratio will increase the resistance in the catalyst bed, shorten the CO residence time, increase the load on the waste heat recovery equipment, produce more process condensate, and affect the production capacity of the equipment.