Hot water circulation system for biogas engineering and user heating and control method thereof

Abstract

The invention relates to a hot water circulation system for biogas engineering and user heating and a control method thereof, and belongs to the field of intelligent control. The hot water circulationsystem comprises a hot water supply system, a heating room, a reaction tank and a heat exchanger installed in the reaction tank; the hot water supply system comprises a solar water heater, a heat preservation storage tank, a temperature adjusting tank, a buffer tank, a controller and a power module. The solar water heater is communicated with the heat preservation storage tank, an electronic constant-temperature water mixing valve is installed on the temperature adjusting tank, and the heat preservation storage tank and the buffer tank are communicated with the hot water inlet end and the cold water inlet end of the electronic constant-temperature water mixing valve respectively. The temperature adjusting tank is connected with the heating room, and the heat exchanger is connected with the buffer tank for storage; and the controller controls the conveying of hot water or cold water in each stage of pipeline. Hot water resources can maintain the biogas engineering fermentation temperature, the temperature of the heating system can be accurately controlled, then the utilization rate of the hot water resources is increased, the fermentation speed is guaranteed, and the biogas productivity is improved.

Description

technical field [0001] The invention belongs to the technical field of intelligent control, and in particular relates to a hot water circulation system and a control method for biogas engineering and user heating. Background technique [0002] With the rapid development of my country's economy, the demand for energy is expanding day by day, and the problem of energy shortage has become an important issue affecting the rapid development of China's economy. Among many new energy sources, biogas is a clean and green energy with a broad market and development space. In the biogas engineering system, the low temperature of anaerobic fermentation is a key factor restricting the development of biogas engineering. Because the temperature is too low to restrict the activity of biogas fermentation microorganisms, especially in winter, the biogas production is insufficient to meet the needs of farmers, so that the biogas project does not have a stable gas supply guarantee. It is very...

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Problems solved by technology

At present, the temperature increase of biogas projects mainly adopts spraying, air heating, and water circulation heating methods, but the cost of spraying and air heating is relatively high. In comparison, solar heating is generally used for water circulation heating, which is relatively cost-effective

[0003] However, the precise temperature control of solar water circulation heating is difficult, and it is also greatly affected by the weather. As a result, the temperature in the reaction tank of the biogas project is unstable. It is possible that the temperature in summer is extremely high, and the biogas is extremely enhanced, while the temperature in winter is not high. , the effect of increasing gas production is not significant, etc.

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