Biogas deoxidization technology

Abstract

The invention discloses a biogas deoxidization technology. Under the action of a catalyst, methane in the raw material biogas is subjected to catalytic combustion reaction with oxygen so as to be deoxidized, a large amount of reaction heat is discharged along with the reaction process, the high-temperature gas after the reaction is subjected to heat recovering, the raw material gas after the deoxidization treatment is returned back to the deoxidization reaction system as recycling gas which is mixed with the un-treated raw material gas, and the amount of the recycling gas is reduced by multi-stage feeding; the catalytic reactor is a single multi-layer adiabatic reactor or multiple serially connected insulation reactors; and the high-temperature deoxidized gas after the reaction is subjected to heat recovering, and the produced superheated steam is returned back to the deoxidization system to provide power for the system or heat the boiler. By adoption of the biogas deoxidization technology disclosed by the invention, the oxygen in the biogas with the oxygen concentration of 0.4% to 12% can be removed effectively and safely, the heat is used completely and reasonably by the recovering of the reaction heat, and the energy consumption in the deoxidization technology process is effectively reduced, thus the technology is a clean biogas deoxidization technology with low energy consumption.

Description

technical field [0001] The invention relates to a mixed gas deoxygenation technology, in particular to a biogas catalytic deoxidation process and comprehensive utilization of reaction heat. Background technique [0002] Biogas is a mixture of various gases, generally containing 50-70% methane, the rest is 20%-40% carbon dioxide, 0%-5% nitrogen, less than 1% hydrogen, less than 0.4% oxygen and 0. 1% ~ 3% hydrogen sulfide, etc., its characteristics are similar to natural gas. The explosion limit of methane in air at normal temperature and pressure is between 5% and 15%. If the air contains 8.6% to 20.8% (by volume) of biogas, an explosive gas mixture will be formed. Due to the air mixed in the pumping process, there are great safety hazards in the pipeline transportation or separation and concentration production process of biogas, so the deoxygenation treatment of biogas is the premise and basis for further utilization. [0003] The biogas deoxygenation method currently ava...

AI Technical Summary

Problems solved by technology

If the oxygen content is too high, the outlet temperature will be too high, causing methane cracking and catalyst sintering

[0005] On the other hand, the processing cost of the biogas deoxidation process mainly comes from the power consumption of the raw material booster and the cycle gas compressor, and the power consumption accounts for about 50% of the processing cost of the entire deoxidation process.

In the process of biogas deoxygenation, methane and oxygen undergo a catalytic combustion reaction, which releases a large amount of heat and causes the temperature of the deoxidized gas to rise. If the heat is not properly utilized, it will even cost energy and equipment to cool it, resulting in a large amount of heat energy. waste