关键词: 畜禽粪污, 无害化处理, 加热系统, 堆肥试验

Abstract: In order to solve the problems of slow material heating, long processing time and inadequate killing of pathogens in the current aerobic fermentation equipment, the heating system of high temperature rapid and harmless treatment equipment for livestock and poultry manure was optimized. Through the combination of heat transfer theory analysis and fluid simulation, Fluent software was used to simulate the flow field in different oil channel structures, analyze the flow path, temperature and wall temperature of the thermal oil path, the structure of heat conduction oil channel was optimized, and the composting experiment was carried out. The results showed that in the simulation, by adding baffles to the heat conduction oil channel, the heat conduction oil flow path was increased, the distribution was more uniform, and the heat transfer effect was better. In the composting experiment, the temperature of thermal oil was kept above 100℃ and the temperature difference between inlet and outlet was about 8℃, so the heat transfer was stable, meanwhile, the correctness of the simulation analysis was verified. The materials in the equipment were heated up to 50℃ within two hours and kept above 60℃ for a long time, reaching the temperature required for killing pathogenic bacteria and other compost. The organic matter and nutrient content of the treated materials reached the national organic fertilizer standard.

Key words: livestock and poultry, harmless treatment, heating system, composting experiment