计及降雨量的养殖场沼气热电联供系统建模与经济分析  

Modeling and economic analysis of biogas cogeneration system for a dairy farm concerning rainfall

作　　者：李爱峰 温鹏[1,2] 贾宇琛 张瑞强[4] 张晓彤 高立艾 LI Aifeng;WEN Peng;JIA Yuchen;ZHANG Ruiqiang;ZHANG Xiaotong;GAO Liai(College of Mechatronical&Electrical Engineering,Hebei Agricultural University,Baoding 07100,China;Hebei Provincial Key Laboratory of Livestock and Poultry Breeding Intelligent Equipment and New Energy Utilization,Baoding 07100,China;College of Information Science and Technology,Hebei Agricultural University,Baoding 07100,China;Hebei Jutan Biotechnology Co.,Ltd.,Hengshui 053000,China)

机构地区：[1]河北农业大学机电工程学院,保定071000 [2]河北省畜禽养殖智能装备与新能源利用重点实验室,保定071000 [3]河北农业大学信息科学与技术学院,保定071000 [4]河北聚碳生物科技有限公司,衡水053000

出　　处：《环境工程学报》2023年第12期4116-4125,共10页Chinese Journal of Environmental Engineering

基　　金：河北省科技厅重点研发计划项目(20327307D);河北省教育厅科学技术研究项目资助(ZD2020145)。

摘　　要：针对夏季强降雨导致厌氧发酵沼气产量理论值偏离实际值的问题,构建计及降雨量的奶牛养殖场沼气热电联供系统仿真模型;然后利用仿真模型计算分析不考虑降雨时与考虑降雨时系统日净收益的偏差;最后探讨1月份发电机组与沼气锅炉的沼气合理分配问题以提高经济效益。首先基于实际现场能量流动关系,建立了厌氧发酵罐、沼气净化装置、储气罐、内燃机发电机组、缸套水换热器、沼气锅炉、蓄热水箱的数学模型。其次,考虑强降雨对料液浓度与料液密度的影响,建立降雨量模型,使雨季日沼气产量模拟值与实际值更吻合。然后在系统仿真模型基础上建立日净收益模型,分别模拟计算不考虑降雨与考虑降雨时的系统日净收益并与实际日净收益对比分析;最后利用日净收益模型求出不同日进料量条件下发电机组不同沼气用量所对应的日净收益,以确定各种进料量条件下的发电机组最佳沼气用量。利用养殖场2020年全年实际运行数据对沼气热电联供系统仿真模型进行正确性验证,建立降雨量模型后日沼气产量模拟值与实际值之间的线性回归决定系数由0.66提升至0.73;日发电量模拟值与实际值之间的线性回归决定系数为0.7;考虑降雨量后日净收益模拟值比不考虑降雨量的日净收益模拟值在准确性上有了很大提高。该研究结果表明,该模型对于该养殖场沼气热电联供系统的工艺流程模拟分析具有准确性和有效性,可为实施养殖场沼气热电联供系统的优化调度、控制规划等提供参考。To address the issue of deviation between theoretical and actual values of anaerobic fermentation biogas production caused by heavy rainfall in summer,a simulation model of biogas cogeneration system in a dairy farm considering rainfall is constructed.The simulation model is then used to calculate and analyze the deviation between the daily net income of the system when rainfall is considered or not.The reasonable allocation of biogas between the power generation unit and biogas boiler in January is explored to improve economic benefits.Firstly,based on the actual on-site energy flow relationship,mathematical models of anaerobic fermentation tanks,biogas purification device,gas storage tank,internal combustion engine generator sets,cylinder liner water heat exchangers,biogas boiler,and heat storage water tank were established.Secondly,considering the impact of heavy rainfall on the concentration and density of feed liquid,a rainfall model is established to better match the simulated and actual values of daily biogas production during the rainy season.Then,based on the system simulation model,a daily net income model is established to simulate the daily net income of the system with and without considering rainfall,and compare the simulation results with the actual daily net income.Finally,the daily net income model is used to calcuiate the daily net income corresponding to different biogas consumption of the power generation unit under different daily feed conditions,in order to determine the optimal biogas usage rates of the power generation unit under various feed conditions.The simulation model of biogas cogeneration system was verified by using the actual operation data of the farm in 2020,and the linear regression coefficient of determination between the simulation value and the actual value of daily biogas production increased from 0.66 to 0.73 after incorporating the rainfall model.The linear regression coefficient of determination between the simulated value and the actual value of daily electricity gener

关 键 词：奶牛养殖场沼气热电联供系统 仿真 厌氧发酵 降雨量 经济效益 

分 类 号：TK01[动力工程及工程热物理]