Energy-saving decarbonization process for biogas

Abstract

The invention discloses an energy-saving decarbonization process for biogas. Biogas which is subjected to desulfurization is compressed by a compressor, then the compressed biogas flows through an absorption tower, CO2 is absorbed, and methane is discharged; a liquid phase at the tower bottom of the absorption tower flows through a hydraulic turbine for energy recovery, then the liquid phase which is subjected to energy recovery flows through an analytic tower for analysis, CO2 is discharged, and the liquid phase at the tower bottom of the analytic tower is conveyed to the absorption tower and is used as an absorbent to be recycled. In the decarbonization process, freeze water is not needed, washing water is water at the normal temperature of less than 30 DEG C, absorption and analysis are performed at normal temperature, and energy required by freezing is not needed to be provided; by the hydraulic turbine, energy can be recycled; and a two-stage absorption tower is used for absorption, so that the yield of methane is improved, and energy consumption and cost are greatly reduced.

Description

technical field [0001] The invention relates to a biogas energy-saving decarbonization process. Background technique [0002] With the shortage of petrochemical resources, the development of secondary energy has become the main development strategy of all countries in the world. Biogas is not only rich in raw materials, but also low in cost, cheap, high in combustion thermal efficiency, and renewable. It is a clean fuel with excellent performance and is also the main aspect of the current new energy development. [0003] Biogas usually contains about (55~60)% methane, (40~45)% carbon dioxide and other small amounts of impurity gases. Domestic biogas is mainly used as fuel for rural stoves, which is not widely used and has low use value. After biogas is purified and decarbonized, its methane content can reach more than 95%, which can be called bio-natural gas, which can be used as vehicle fuel gas and chemical raw materials. wider. [0004] At present, the decarbonization ...

AI Technical Summary

Problems solved by technology

[0007] The energy in the above-mentioned decarbonization process is not effectively utilized, the energy consumption is high, the absorption water temperature is low, refrigeration equipment is required, and energy is consumed

CO dissolved in water 2 Relying on flash analysis, there are more residues, which affects the absorption capacity and increases the amount of circulating water

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