The complex iron desulfurization technology is applied to remove hydrogen sulfide gas contained in biogas. It seems simple, but there are many engineering essentials in it.
Biogas comes from various sources. Biogas is a kind of combustible gas produced by various organic substances through the fermentation of microorganisms under the conditions suitable for temperature and humidity. It is generally a mixture of gases, including methane, carbon dioxide, hydrogen sulfide, carbon monoxide, hydrogen, oxygen, nitrogen and other gases. The main components are methane and dioxygen The content of other components is low.
Biogas extinguishment can supply energy, and at the same time, it can synthesize substances that are not needed, so the application of fermentation can complete the environmental protection function and can also recover energy. Generally, hydrogen sulfide removal is required in the application process of biogas, which is very common and mature.
The traditional civil biogas digesters mostly use iron oxide desulfurizer, which is small in quantity, suitable and convenient.
Compared with the recently used complex iron desulfurization technology, we tend to discuss the treatment of fermentation biogas digesters in small and medium-sized enterprises. For example, biogas for livestock and poultry breeding, biogas purification for urban sewage, biogas for pharmaceutical plants, biogas for paper mills, biogas for distilleries, biogas for sugar factories, biogas digesters for waste disposal, etc. all have biogas disposal needs. The main reason that limits the application of complex iron desulfurization technology in general biogas desulfurization is that the application of complex iron desulfurization technology in biogas is economical only in a certain range, and at the same time, complex iron desulfurization technology in biogas has certain technical know-how.
From the perspective of domestic application of complex iron desulfurization technology, localization has been stopped in relevant research institutes, and it is mainly in the field of oil field. The main reason is that the early complex iron desulfurization catalyst was introduced from abroad with high price and high technical cost. It can only be used in oil and gas fields with high value to support. However, with the development of agents, universities, research institutes and enterprises, the application of the whole complex iron desulfurization industry seems to be developing rapidly. Among them, Tangshan Lvyuan environmental protection Co., Ltd., which has made great contribution, has made more research and development investment and market cultivation for private enterprises specially engaged in complex iron desulfurization technology and hydrogen sulfide management. At the same time, the enterprise is also a researcher, developer and cultivator in the field of domestic complex iron desulfurization.
In the process of complex iron desulfurization, the oxidation recovery property of basic complex iron catalyst is applied to absorb H2S in feed gas. H2S is directly oxidized by iron complex catalyst to generate elemental sulfur, which is converted into iron complex. Then air is blown in the regeneration process to oxidize the iron complex in the rich solution of catalyst by air, so that the iron complex in the rich solution of catalyst can be converted into iron complex, so as to be recycled. The generated sulfur is disposed by sulfur recovery system.
Biogas is desulfurized by complex iron with the following characteristics
1. H2S content in purified gas after treatment: ≤ 10ppm;
2. Operation flexibility: 60-120%;
3. Skid integration can be stopped;
4. By product sulfur paste or sulfur with high quality
As the selectivity of the complex iron catalyst for the conversion of hydrogen sulfide to sulfur reaches over 99%, there is no by-salt produced, and there is no need to discharge the waste liquid outward. The locally discharged gas can be discharged safely and without pollution after the solution carried by the regeneration waste gas separator is recovered. There is no large solid waste and noise pollution source in the installation.
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