A low energy consumption biogas system adapted to cold regions

Abstract

The invention belongs to the field of biomass energy utilization and environmental protection, and in particular relates to a low energy consumption operation biogas system suitable for cold regions. The low energy consumption operation biogas system includes an anaerobic fermentation tank, a fermentation tank heat-insulation system, a fermentation tank hydraulic mixing and fluid state material feeding system integrated system, a fermented material online solid-liquid separation system and a dry material under-liquid-level non-plugging spiral feeding system, the fermentation tank heat-insulation system is arranged on the anaerobic fermentation tank outer wall and the bottom of the tank body, the fermentation tank hydraulic mixing and fluid state material feeding system integrated system and the fermented material online solid-liquid separation system are connected with the anaerobic fermentation tank, the dry material under-liquid-level non-plugging spiral feeding system is arranged on the upper end of the anaerobic fermentation tank, and a dry material is conveyed under the liquid level of the anaerobic fermentation tank by the e dry material under-liquid-level non-plugging spiral feeding system; the low energy consumption operation biogas system can reduce tank body heat dissipation and tank body feeding energy consumption, improves the tank body discharging heat recovery, improves the engineering energy output, and overcomes the disadvantages that biogas in the cold regions is very high in energy consumption and is difficult to run.

Description

technical field [0001] The invention belongs to the field of biomass energy utilization and environmental protection, in particular to a low-energy-consumption biogas system adapted to cold regions. Background technique [0002] The northern regions of my country such as Northeast China, North China and Northwest China are the main agricultural production areas in my country. Agriculture and animal husbandry are developed, and a large amount of crop straw and livestock and poultry manure are produced every year, which has a good raw material base for the development of biomass energy industry. However, in these areas, especially the northeast and northwest regions, the winter climate is very cold, and the energy consumption of traditional biogas projects in winter operation is very high (mainly the heat consumption of project operation), and the energy consumption / energy output of biogas projects in winter operation is between 50% and 100%. %, and even some projects consume ...

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Problems solved by technology

However, in these areas, especially the northeast and northwest regions, the winter climate is very cold, and the energy consumption of traditional biogas projects in winter operation is very high (mainly the heat consumption of project operation), and the energy consumption / energy output of biogas projects in winter operation is between 50% and 100%. %, even part of the project energy consumption is higher than the energy output, the energy and economic benefits of biogas projects are very poor

There are many reasons for this phenomenon, which can be divided into three categories: first, the feed concentration of the material is low. The feed concentration of traditional mud pumps and screw pumps is between 4% and 8%. Traditional poultry manure raw materials often need to add water to remove sand, so the fermentation concentration of the material is very low, and most of the heat (more than 80%) in the operation of the biogas project comes from the fermentation material (mainly the moisture contained in the fermentation material) Warming, the material concentration is very low means that the heat energy required for warming is very high; second, the tank insulation method is backward, the current tank insulation is basically based on laying benzene board and rock wool on the outer wall of the tank, and the bottom of the tank is basically not As an insulation layer, the insulation effect is poor, and the heat dissipation in winter operation is large; third, the heat waste of the tank discharge unit is serious, and there is no waste heat recovery method for biogas residue and biogas slurry; fourth, the raw material is single, mainly livestock manure, and the output The gas potential is small, and the production capacity of the fermentation process is low

The above reasons together lead to the high energy consumption and poor energy output of my country's existing biogas projects in the cold northern regions.

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