Reviewing the Old to Discover the New (Series 5)
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To produce water gas with high levels of CO and H2 through the reaction of coal with water vapor, under what conditions should the reaction take place? Under what conditions should the reaction be carried out to produce high-calorific-value gas with a high CH4 content?
To produce water gas with high levels of CO and H2 by reacting coal with water vapor, the reaction should be carried out at high temperature and low pressure； To produce gas with a high calorific value and a high CH4 content, the reaction should be carried out at low temperature and high pressure.
To produce water gas with high levels of CO and H2 through the reaction of coal with water vapor, under what conditions should the reaction take place? Under what conditions should the reaction be carried out to produce high-calorific-value gas with a high CH4 content?
To produce water gas with high concentrations of CO and H2 by reacting coal with water vapor, the reaction must take place at high temperatures； To produce gas with a high calorific value and a high CH4 content, the reaction should be carried out at low temperature and high pressure.
To produce water gas with high concentrations of CO and H2, the reaction should take place at low pressure and high temperature; whereas to produce gas with a high calorific value and high methane content, it is advantageous to carry out the reaction at low pressure and high temperature
To produce water gas with high levels of CO and H2 by reacting coal with water vapor, the reaction should be carried out under low pressure and high temperature conditions; to obtain gas with a high heat value and high CH4 content, the reaction should take place under low pressure and high temperature conditions
Coal and water vapor react at high temperatures to produce water gas, whose main components are carbon monoxide and hydrogen. The chemical equation for this reaction is: C + H2O → high temperature → CO + H2； The reaction occurs under high-temperature conditions and is an endothermic reaction ； Based on the analysis of energy conservation and Hess’s law, converting coal into water gas does not increase the energy produced by the coal. When equal masses of methane and carbon monoxide are completely burned, the reactions are as follows: CH4 + 2O2 = CO2 + 2H2O, and 2CO + O2 = 2CO2. Assuming both substances have a mass of 1 g, the ratio of the required oxygen masses is 1 g / (16 g/mol × 2 × 32 g/mol) : 1 g / (28 g/mol × 0.5 × 32 g/mol) = 7:1
Coal reacts with water vapor to produce coal gas.