Super Opticlaus
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In the ultra-high Claus process, where do CO and H2 come from in the process gas fed to the high-grade Claus reaction? And what is the specific content? Are there any process parameters?
The source of hydrogen for hydrogenation reduction is that, under the action of a catalyst, CH4 reacts with H2O to produce hydrogen, and CO reacts with H2O to produce hydrogen; no external hydrogen supply is required.
Reply to 2# wgonline: If the concentration of acidic gases is low, isn’t it still necessary to add liquid nitrogen to the fuel gas for washing, given that it contains methane, H2, CO, and N2?
This post was last edited by wgonline on 2010-12-25 at 13:38. Reply to 3# baozhu200499: Liquid nitrogen is used to clean fuel gas, but its calorific value is very low and it varies considerably; therefore it is not used as an auxiliary gas source for the main combustion chamber. Natural gas or coal gas is generally used instead. Liquid nitrogen tail gas cleaning is generally used in tail gas incineration systems. The concentration of acidic gas can be adjusted through the reflux line for low-methane gas; this will only result in a decrease in the volume of acidic gas sent to sulfur recovery, but the concentration can still be maintained above 25%. If the concentration is not adjusted, there will be problems with the operation of the low-methane gas system. The main function of the external gas supply is to maintain the combustion temperature in the main combustion chamber; for example, when ammonia is to be burned, the furnace temperature must be kept above 1250 degrees Celsius for ammonia to decompose into nitrogen and hydrogen. If the combustion temperature can be reached, the auxiliary gas supply is generally not turned on.
Reply to 4# wgonline: If the concentration of hydrogen sulfide imported is too low, it won’t be possible to reach 25% regardless of how much recycling is done. Striving for a higher concentration increases energy consumption, and the sulfur content in the lean methanol also becomes higher.
The purpose of hydrogenation before entering the super Claus reactor is to cause SO2, unconverted COS, CS2, etc. to react with hydrogen to form H2S; under the action of the super Claus catalyst, H2S reacts with O2 to produce elemental sulfur. Hydrogenation can use hydrogen with hydrogen recovery.
Hydrogen is produced by side reactions. Combustion with another fuel is required when the concentration is too low