System for promoting fermentation of biogas from lignocellulose materials by utilizing microalgae

Abstract

The invention belongs to the field of bioenergy development and utilization and environmental protection and specifically relates to a system for promoting fermentation of biogas from lignocellulose materials by utilizing microalgae. The system comprises a raw material pretreatment device, a regulating reservoir, an anaerobic reactor, solid / liquid separation equipment, a biogas purification and separation device and a microalgae culture facility. The invention is characterized in that C / N of the fermentation liquor is regulated by culturing the microalgae and carrying out mixed anaerobic fermentation on the microalgae and the lignocellulose materials to make up the restriction of insufficient content of the lignocellulose material N to biogas generation through anaerobic fermentation, meanwhile, the microalgae participate in improving the energy yield of the whole fermentation system, the biogas generated through fermentation is purified and separated to separate CO2 from CH4, the separated CO2 is pumped into the microalgae culture facility to be used for enhancing the photosynthesis of the microalgae and the CH4 is directly used as energy or chemical raw material. The system solves the problem of insufficient nitrogen sources in most lignocellulose materials for anaerobic fermentation.

Description

technical field [0001] The invention belongs to the fields of bioenergy development and utilization and environmental protection, and in particular relates to a system for promoting biogas fermentation of lignocellulosic raw materials by using microalgae. Background technique [0002] Driven by the strong demand for developing a low-carbon economy, bioenergy has received unprecedented attention. The development of biofuels to replace fossil fuels has become an important trend in the world's energy development. To this end, countries around the world have formulated strategic plans to promote the development of bio-energy. The United States proposed the "30-30 plan", that is, 30% of the transportation fuel in the United States will be replaced by biofuels in 2030, and Europe proposed the "20-20 plan". That is, by 2020, renewable energy will account for 20% of the EU's energy consumption, and biofuels will account for more than 10% of transportation fuels. In the bio-energy ...

AI Technical Summary

Problems solved by technology

Although it is a very economical and efficient method to use manure as a mixed raw material to adjust the C / N of fermentation raw materials, the domestic application of this method mainly faces the problem of limited supply of raw materials, that is to say, in many cases, lignocellulosic biogas such as straw There is no fecal raw material available around the fermentation project, but there is basically no such problem in the foreign farm operation mode

In the absence of manure and other N-rich raw materials available, in order to adjust the nutritional balance of the fermentation broth, only the addition of chemical agents, such as NH 4 HCO 3 to supplement the N element of the fermentation raw material, while the use of chemical agents increases the operating cost of the biogas project and reduces its economic benefits

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