Abstract:Aiming to solve the problems of insufficient aeration and low spray uniformity in the existing equipment during the actual operation of the microaerobic synchronous preheating sequential batch dry fermentation process, accelerate the degradation of fiber materials and the conversion of intermediate substances and improve the efficiency of gas production, the equipment spray system and aeration system were innovatively designed, micro-aerobic pre-heating sequential batch anaerobic dry fermentation integrated equipment was optimized and integrated, realizing micro-aerobic rapid pre-heating, spray uniform inoculation, and efficient production of biogas. The spiral nozzles suitable for the circulation of viscous biogas slurry were selected through the comparison of nozzle characteristics, and it was calculated that when the spray area was 0.6m×0.6m, the best nozzle spacing and pipe diameter were 0.37m and 0.08m, respectively, and the spray coverage area can reach 87.33% of the surface area of the material. In order to facilitate the entry and exit of materials, the aeration pipes were designed to be symmetrically distributed on both sides of the materials, and a total of six parallel aeration pipes were set up. The distance between the pipes on one side and the pipes at both ends was 0.5m and 0.7m, respectively. The equipment was integrated and coupled with a micro-aerobic synchronous pre-heating sequential batch dry fermentation process. Through long-term experiments, it was determined that the sequential batch start-up control strategy of multiple reactors in actual operation should be eight reactors, the start interval was 3d, and the fermentation period was 24d. Based on the calculation of the economic benefits of technical equipment application in large-scale dairy farms, it was concluded that the investment recovery period was about 4 years, which was about 1.3 years less than the traditional wet anaerobic fermentation technology. This research can provide a theoretical basis for the efficient operation of the sequencing batch anaerobic dry fermentation technology in the actual application process.