In response to the request of biogas generator for biogas, the disposal system in front of the biogas generator to deal with the contradiction between the gas source side and the gas side is an effective way to deal with the application of biogas generating units. The following two aspects are mainly manifested today:
1. Reducing the relative humidity of gases
The removal of water can be divided into two parts: the removal of condensate water and the removal of non-condensate water. The former can be accomplished by steam-water separator, while the latter is more complex. At present, there are mainly the following ways:
(a) Low temperature dehumidification: the refrigeration equipment reduces the temperature of the gas, condensates the water vapor in it, and then sweeps the system;
(b) Adsorption: Water in the gas is separated by adsorbent with strong adsorbing effect on water.
(c) Membrane filtration: Water is separated from gases under specific conditions using specially constructed membrane data.
2. Reducing the content of impurities in gases
Impurities in gases are comparatively complex components. Because they are for the application of the initiator, the identification of impurities is mainly based on the request of the initiator. There are the following main types:
(a) Removal of sulphur:
The removal of hydrogen sulfide mainly includes physical, chemical and biological methods. Physical method mainly refers to physical adsorption desulfurization, which is cumbersome to operate, but often requires larger equipment, and adsorbent needs regeneration. Chemical means that sulfur is solidified by chemical reaction. At present, there are dry and wet methods. The main difference is whether the physical form of the reactant is solid or liquid. Biological desulfurization is a newly developed method. Its main principle is to cultivate suitable strains in the reactor tank. These strains are fed with sulfide and fix sulfur in them. For gases with low sulfur content, physical adsorption or dry desulfurization is generally economical and applicable, and the operation is cumbersome.
In addition, according to China's environmental protection regulations, when biogas is used as energy, the H2S content in biogas should not exceed 200 mg/Nm3. Therefore, it is necessary to use biogas analyzer to stop real-time on-line monitoring of H2S content in biogas after desulfurization treatment, to provide real-time and accurate data reference for owners, to help them stop optimizing and adjusting the pretreatment process of biogas, and to improve the intake quality of biogas generating units, so as to ensure that H2S content reaches the requirement of Biogas power generation.
Because the composition of biogas is complex, besides H2S, it also contains CH4, CO2 and O2. If we want to ensure the biogas quality of biogas generating units, improve the calorific value of biogas, and ensure the efficiency of biogas extinguishing and generating electricity, besides reducing the content of H2S, the concentration of CH4 and CO2 in biogas should be monitored to provide reference basis for optimizing anaerobic fermentation process, improving the content of CH4 and reducing the content of CO2. Necessary.