Over the years, China's biogas industry has developed rapidly, driven by central investment. Up to now, China's total biogas production is 15.8 billion cubic meters, which means that in the next five years, the total biogas production will increase by 31.1%. Generally speaking, biogas in China is gradually changing from household biogas to a new pattern of diversified development. Here biogas bio-desulfurization equipment manufacturers also remind you that biogas engineering is a more complex system, from raw material collection to production process to by-product utilization and absorption must ensure the smooth middle link, the whole process must be centralized monitoring technology as support, in order to achieve efficient operation, and thus significantly improve economic efficiency.
I. Optimizing Monitoring and Anaerobic Fermentation
Anaerobic digester is the core equipment of large and medium-sized biogas engineering. Microbial reproduction, decomposition and transformation of organic matter and biogas production are carried out in digester. Anaerobic fermentation is a complex process. Pretreatment, inoculation ratio, total solid concentration, raw materials, temperature and Exogenous Additives all have significant effects on anaerobic fermentation. Therefore, besides choosing suitable process type and digester structure according to fermentation raw materials, it is also the key point to ensure the efficient operation of biogas project to master the operation of anaerobic digester through monitoring system. Through the monitoring data, the anaerobic fermentation process is deeply studied, the potential of improving performance is explored, and the fermentation conditions are adjusted and optimized in time. It is of great significance to improve gas production efficiency and methane content.
2. Optimizing Monitoring and Biogas Purification
The main components of biogas are CH4 and CO2. In addition, it contains some other trace components, such as H2, H2S and so on. The incorporation of biogas into natural gas networks, or for automotive fuels, power generation, fuel cells and so on, generally has strict requirements on its components. For example, biogas usually contains more than 60% methane, while automobile natural gas contains more than 90% methane. Therefore, it is necessary to purify biogas by pressure swing adsorption (PSA), water washing, propylene carbonate and alkali solution absorption and other physical and chemical methods to make it a high quality biogas with high CH4 content, high calorific value and quality of impurity gas components in line with the requirements of natural gas standards.
Biogas is purified into biogas, which can replace gasoline and CNG as vehicle fuel. Compared with natural gas, it has the characteristics of reusable waste production, free from gas sources and geographical restrictions, and renewable. The biogas project which produces 30,000 to 40,000 cubic meters of biogas per day can produce more than 20,000 cubic meters of natural gas after purification, with considerable benefits. Using biogas analyzer to monitor methane content, grasp key data such as methane recovery rate and desulfurization efficiency, and optimize the process of anaerobic fermentation and purification accordingly, can significantly improve the economic benefits of biogas and biogas engineering. Correspondingly, the neglect of management of each link of biogas project will directly lead to a decline in profits, which is one of the important reasons why most of the small and medium-sized biogas projects in China are losing money.
3. Optimizing Monitoring and Cogeneration
In cogeneration projects, gas turbines and heat exchangers are used to heat anaerobic digestion cells and generate electricity. Gas engine driven by biogas usually requires hydrogen sulfide (H2S) removal capacity of biogas pretreatment system to reach 99.9%. Therefore, biogas quality inspection is needed. Continuous biogas monitoring enables fuel conditions to meet requirements, thus protecting generators from loss of profits due to damage and unplanned outage, and helping staff adjust internal recycling rate and pretreatment level to optimize combustion. It can be further said that improving combustion efficiency and equipment utilization time is to improve the profit margin of biogas engineering.
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