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Biogas purification standards

Biogas purification standards
The main components of biogas are CH4 and CO2, and the high-purity methane gas obtained by separating CO2 from the mixed gas is called biological natural gas. Biological natural gas can be directly used as an alternative fuel for petrochemical natural gas. The increasing demand for natural gas by humans has driven the development of bio natural gas technology. This article analyzes the differences in characteristics between biogas and natural gas, as well as the possibility of biogas purification replacing natural gas. It reviews the progress of methods for biogas purification, including pressurized water washing, chemical absorption, pressure swing adsorption (PSA), membrane separation, low-temperature separation, and in-situ methane enrichment, Among them, the pressurized water washing method and PSA method have become the two most commercially available technologies due to their comprehensive advantages in technology and economy. The performance of membrane separation technology in reducing purification costs and simplifying purification systems makes it a promising technology for development. Methane in-situ enrichment technology has advantages in using high solid content raw materials to produce biological natural gas.
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Apr 15, 2025
Henan Provincial Department of Science and Technology and Kaifeng Shunhe District Bureau of Industry and Information Technology Jointly Inspect DEAR A
Apr 10, 2025
DEAR Air Separation Collaborates with Xi'an Jiaotong University and Xi'an University of Posts & Telecommunications to Advance Intelligent Air Separati
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At present, there are two types of common condensing evaporators in domestic air separation units, plate fin condensing evaporator and tubular condensing evaporator. Tubular condensing evaporator is divided into three types: long tube, short tube and coil. The long tube and short tube are all in row. The tube is made of red copper and the tube sheet is made of brass. It is generally used in small and medium-sized air separation plants. Coil type is generally used for auxiliary condensing evaporator. Because there is no fixed liquid level in the coil, the heat transfer coefficient is small, so it has been gradually eliminated. The plate fin condenser evaporator is made of all aluminum structure, and the plate unit is arranged in vertical star shape. Its characteristics are compact structure, light weight, small volume and easy to manufacture. It is widely used in large and medium air separation plants. Due to the gradual enlargement of the air separation unit, the heat excha
Sep 16, 2025
The air is mainly composed of 78.03% nitrogen and 20.93% oxygen and other gases. Air separation is to cool the air to a certain low temperature firstly and liquefy it into liquid air. Reuse two liquids oxygen and nitrogen with different boiling points (At atmospheric pressure, the boiling point of oxygen is - 183.98°C and that of nitrogen is - 195.8°C), separation is carried out in an air fractionator equipped with sieve plates. The air separation column is also called distillation column. Air distillation column can be divided into single-stage distillation column and double-stage distillation column, and single-stage distillation column can only produce one kind of pure product. Two stage distillation column is used to produce high purity nitrogen and oxygen in common air separation unit.
Sep 08, 2025
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