Cold resistant mash gas preparing process

Abstract

The cold resistant mash gas producing process includes the preparation of mash gas material and the preparation of heat raising and heat insulating heating material. The mash gas material is compounded in semi-humid solid state with water content of 22-85 %; and the heat raising and heat insulating heating material set outside the container has water content of 30-85 %. Through normal anaerobic fermentation, great amount of heat is generated to maintain the fermentation at 30-55 deg.c so as to resist cold and generate mash gas at high efficiency. In addition, the present invention can save great amount of water.

Description

technical field [0001] The invention relates to a method for preparing biogas raw materials and thermal insulation materials, in particular to a cold-resistant biogas preparation method. Background technique [0002] As a clean new energy, biogas has been popularized and promoted for more than 30 years. It has solved part of the problem of living and cooking energy in rural areas and has a good role in environmental protection, and has been welcomed by farmers. However, at present, most of the traditional biogas digesters are buried in the ground with a dry matter concentration of only 4-6% of the "wet fermentation" method. If the dry matter concentration exceeds 6%, it will cause crusting on the liquid surface inside the biogas digester. The problem is that once crusts appear, the biogas cannot be produced and used normally. At the same time, because a large amount of liquid water is in the underground environment in the cold season, it is consistent with the ground tempera...

AI Technical Summary

Problems solved by technology

However, at present, most of the traditional biogas digesters are buried in the ground with a dry matter concentration of only 4-6% of the "wet fermentation" method. If the dry matter concentration exceeds 6%, it will cause crusting on the liquid surface inside the biogas digester. The problem is that once crusts appear, the biogas cannot be produced and used normally. At the same time, because a large amount of liquid water is in the underground environment in the cold season, it is consistent with the ground temperature, and it is not easy to raise the temperature. Therefore, the fermentation of biogas raw materials is at a low temperature. Normal and low temperature fermentation state, the temperature range is 8-18°C (four seasons), and the methanogens that play the main role in gas production are very inactive at low temperature and normal temperature, the activity is greatly weakened when it is below 15°C, and it will become weak when it is below 8°C. Stop fermentation, so traditional underground biogas digesters often produce little or no gas in winter and cannot be used

In the northern part of my country, due to the low temperature and ground temperature in autumn, winter and spring, there are 5-7 months in a year that cannot produce gas normally. Small, resulting in the failure to produce biogas normally for a considerable amount of time, thus affecting the normal use of biogas