Operation Mode of Solar and Untreated Sewage Source Heat Pump System for Heating Biogas Digesters
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摘要: 针对现有热泵沼液增温系统投资高、运行困难的缺陷,设计了一套太阳能-污水热泵沼液增温系统(solar and untreated sewage source heat pump system,SUSSHPS).该系统设定3种系统运行模式,分别为全年中温增温模式、全年高温增温模式和夏季高温增温、冬季中温增温模式,并从系统运行能耗、环保性、经济性与产气量最大化角度对各增温模式进行理论计算,同时,构建太阳能-污水热泵沼液增温系统运行模式综合评价体系,运用改进熵值法对评价指标进行综合赋权.研究结果表明,全年中温增温模式、全年高温增温模式和夏季高温增温-冬季中温增温模式的综合评价值分别为0.293 0、0.327 5和0.379 5,夏季高温增温-冬季中温增温模式是三者中最优的运行模式.Abstract: A solar and untreated sewage source heat pump system (SUSSHPS) for heating biogas digesters was designed because of the high investment and difficult operation of current heating systems. To determine the optimal operation mode, three operation modes were designed: annual middle-temperature fermentation mode (mode 1), annual high-temperature fermentation mode (mode 2), and summer high-temperature fermentation and winter middle-temperature fermentation mode (mode 3). The three modes were evaluated from four perspectives: energy consumption, environmental protection, economy, and gas production. Finally, a comprehensive evaluation system of SUSSHPS operation mode was built based on comprehensiveness and independence. The evaluation index was a comprehensive weight calculated via an improved entropic coefficient method. The results indicate that model 3 (0.379 5) > model 2 (0.327 5) > model 1 (0.293 0), thus model 3 is the optimal operation mode.
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Key words:
- untreated sewage /
- solar energy /
- heating system /
- heat pump /
- biogas /
- operation mode
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表 1 不同模式下系统年产气量
Table 1. Biogas production in different modes
参数 模式1 模式2 模式3 Ri/(m3•a–1) 2 141.1 2 635.2 2 388.2 表 2 不同模式下系统运行能耗
Table 2. Energy consumption of different modes
参数 模式1 模式2 模式3 Wre 0.55 1.25 0.89 Qzq 0.53 1.08 0.80 Qsx 0.05 0.11 0.08 Plx 0.19 0.19 0.16 Pqx 0.21 0.21 0.18 Pzx 0.38 0.38 0.38 Qi 1.34 2.03 1.61 Ei 1.66 2.46 2.21 表 3 不同模式下系统运行能量收益
Table 3. Energy income of different modes
参数 模式1 模式2 模式3 ${Q'_i}$ 10 570.66 16 056.70 12 753.69 ${Q_0}$ 52 671.06 59 819.04 56 246.28 ${Q''_i}$ 42 100.40 43 762.34 43 492.59 表 4 不同模式下系统运行费用
Table 4. System consumption of different modes
参数 模式1 模式2 模式3 Pc 8 132.14 8 548.51 7 934.84 C 1 556.24 2 363.90 1 877.63 S 162.64 170.97 158.70 Ac 2 674.08 3 538.98 2 968.35 表 5 不同模式下系统运行环保效益
Table 5. System environmental protection benefits of different modes
参数 模式1 模式2 模式3 Hi/(MJ•a–1) 34 252.28 49 408.21 40 281.67 ηi/% 30.67 0 18.47 By/(t•a–1) 5.63 5.63 5.63 Py/(t•a–1) 2.65 4.32 3.37 Ey/(t•a–1) 3.12 1.04 2.24 表 6 不同模式下评价指标熵权值计算结果
Table 6. Entropy and weight of each index under various modes
指标 Ej θj wj γj Ri/(m3•a–1) 0.965 6 0.120 7 0.143 3 0.138 5 Qi/kW 0.966 0 0.119 6 0.084 1 0.080 5 Ei 0.965 5 0.121 0 0.186 4 0.180 6 ${Q''_i}$/(MJ•a–1) 0.963 7 0.127 5 0.165 2 0.168 7 Pc/元 0.965 8 0.120 3 0.102 3 0.098 5 Ac/元 0.957 1 0.150 6 0.109 7 0.132 2 T/a 0.965 6 0.120 7 0.104 5 0.101 0 Ey/(t•a–1) 0.966 0 0.119 6 0.104 5 0.100 0 表 7 不同模式综合评价值
Table 7. Comprehensive evaluation value of different modes
模式1 模式2 模式3 0.293 0 0.327 5 0.379 5 -
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