Heating performance of landfill gas fuled biogas engine driven air source heat pump

doi:10.11949/j.issn.0438-1157.20161351

Abstract

Abstract:

To utilize the renewable energy source from landfill gas(LFG) and reduce the consumption of fossil fuels,an LFG fueled biogas engine driven air source heat pump heating system was presented and its heating performance was studied.The type of the LFG collecting system and the LFG purifying process suitable for this system were determined.The experimental platform established can experimentally test two operating modes respectively,i.e.,the waste heat recovery from biogas engine exhaust fume alone or from both cylinder liner cooling water and exhaust fume simultaneously,by shifting the switching valves.The heating performance of the system was tested,and factors such as biogas engine speed,condenser water flow rate and condenser inlet water temperature,which have effect on the heating performance,were analyzed.Results of the experiment indicated that the total heating output of the system increased with biogas engine speed and condenser water flow rate,but it decreased with condenser water inlet temperature rise.Although the coefficient of performance(COP)and the primary energy ratio(PER) of the system reduced with condenser water inlet temperature rise as well,but their relationship with condenser water flow rate was not monotonic one.The study also revealed that the heating performance of the system was in its maximum when the condenser water flow rate ran at 1.45-1.65 kg·s^-1,and the COP and PER of the system reached their maximum of 4.3 and 1.48 respectively when the condenser water inlet temperature was 35-45℃.

Key words: renewable energy, thermodynamics process, waste heat recovery, landfill gas, condenser water flow rate, condenser water inlet temperature, numerical analysis

摘要：

为了利用垃圾填埋气（LFG）这种可再生能源，减少化石燃料的消耗，提出一种以LFG为燃料的空气源沼气机热泵供热系统，并研究其供热性能。确定了LFG收集系统以及适合沼气机热泵系统的LFG净化方法。所构建的实验平台可经阀门切换，分别研究沼气机排烟余热单独回收利用或缸套冷却水和排烟余热同时回收利用两种模式。进行了系统供热性能的实验测试，并对影响系统供热性能的沼气机转速、冷凝器水流量、冷凝器进水温度等因素进行了分析。实验结果表明：该热泵系统的总供热量随沼气机转速和冷凝器水流量增大而增大，随冷凝器进水温度升高而减小。系统制热系数（COP）和一次能源利用率（PER）均随冷凝器进水温度升高而减小，但其与冷凝器水流量的关系并非单调变化关系。当冷凝器水流量为1.45~1.65 kg·s^-1时，系统供热性能最好；当冷凝器进水温度为35~45℃时，系统的COP最高可达到4.3，PER最高可达到1.48。

关键词: 再生能源, 热力学过程, 余热回收, 垃圾填埋气, 冷凝器水流量, 冷凝器进水温度, 数值分析

CLC Number:

TU832.2

WA Yimin, WU Jiying. Heating performance of landfill gas fuled biogas engine driven air source heat pump[J]. CIESC Journal, 2016, 67(S2): 370-377.

马益民, 吴集迎. 以LFG为燃料的空气源沼气机热泵供热性能[J]. 化工学报, 2016, 67(S2): 370-377.

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