Reactions in the converter in methanol production from coke oven gas
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(1) Combustion reactions in the upper part of the converter: CH4 + 2O2 = CO2 + 2H2O + Q; H2 + 1/2O2 = H2O + Q. (2) The methane conversion reactions take place mainly in the catalyst layer. The reactions for the conversion of methane vapor are as follows: CH4 + H2O = CO + 3H2 – Q; CH4 + CO2 = 2CO + 2H2 – Q; CnHm + nH2O = nCO + (m/2 + n)H2 – Q. What other side reactions occur in the converter besides these main reactions? Are there any side reactions that produce hydrogen sulfide?
Catalytic conversion does not involve any reactions involving sulfur; it is generally assumed that desulfurization is completed prior to this step, and what follows is the shift reaction: CO + H2O = CO2 + H2
In fact, the main reaction in the combustion zone is the combustion of hydrogen, as hydrogen is highly reactive and burns very quickly. As for the formation of hydrogen sulfide, it generally does not occur, unless the desulfurization accuracy is insufficient; in that case, when organic sulfur enters the second furnace at high temperatures, it turns into hydrogen sulfide and sulfur oxides.
But the sulfur content in the gas after desulfurization is within the acceptable range, at less than 0.1 ppm. I don’t know why the sulfur content increases again after normal-temperature oxidation with zinc oxide I’m talking about the methanol production process using coke oven gas, the one designed by the Second Chemical Engineering Institute
But the sulfur content in the gas after desulfurization is within the acceptable range, at less than 0.1 ppm. I don’t know why the sulfur content increases again after normal-temperature oxidation with zinc oxide I’m talking about the methanol production process using coke oven gas, the one designed by the Second Chemical Engineering Institute
The combustion rate of hydrogen is more than 1,000 times that of methane; therefore, combustion in the combustion section of the converter is primarily due to hydrogen. Of course, other oxidation reactions also occur, such as the oxidation of organic sulfur, etc., but in very small amounts.
Hehe, is it possible that the zinc oxide is saturated with sulfur and needs more sulfur added?
In a conversion furnace, organic sulfur is converted into hydrogen sulfide. For catalytic conversion, it is necessary to ensure that the total sulfur content at the inlet does not exceed the specified limits. If the sulfur content at the outlet after desulfurization is within acceptable levels but increases after conversion, it is necessary to check whether any undetected organic sulfur has entered the conversion furnace
If the temperature and water-carbon ratio in the converter are not properly adjusted, carbon precipitation reactions can occur. Additionally, the converter absorbs some sulfur while driving, and if the conditions are not properly controlled, sulfur may be released.
Is it the heat exchanger for your coke oven gas and converted gas that is leaking, causing excessive sulfur levels in the subsequent processing stages?
In such a situation, by carefully examining the chromatogram of gas sulfur analysis, it is certain that there are other peaks corresponding to sulfur compounds as well