Abstract:

To make effective use of waste heat resources，different oilfield enterprises use heat pump and other technologies to replace oil and gas-fired boiler，and use waste heat of produced fluid for heat supply of oilfield production and living system. Heat pump has gradually found its application in oilfields. As the only moving part in heat pump system，compressor is the heart of heat pump. Magnetic levitation centrifugal compressor uses advanced magnetic levitation and DC frequency conversion technologies，which can greatly improve unit capacity. To investigate the impact of compressor on COP of water source heat pump and provide reference for model selection of water source heat pump，a case of actual use of waste heat of effluent is used for model selection and comparison of water source heat pump. The results indicate that while the COP of conventional screw compressor heat pump is only 2.4 in terms of waste heat utilization，the COP of magnetic levitation heat pump can reach 3.54，which is higher than the COP standard for waste heat utilization of water source heat pump and 32% higher in energy conservation rate than the original screw compressor heat pump. Counted by unit price of electricity bill of 1.0 yuan/（kW·h），it can save operating power charge of 117.33×10⁴ yuan on a yearly basis. With higher COP，load regulation performance，reliability and stability than other heat pump technologies，the magnetic levitation heat pump can reduce on-site maintenance at the same time，which is more suitable for field application in oilfields.

Key words:

electrification, water source heat pump, magnetic levitation heat pump, oil-free magnetic bearing, high efficient energy conservation

摘要：

为使余热资源得到有效利用，各油田企业采取热泵等技术替代燃油、燃气加热炉，使采出液的余热用于油田生产、生活系统供热，热泵在油田逐渐得到应用。压缩机是热泵系统中唯一的运动部件，是热泵的心脏。磁悬浮离心式压缩机采用先进的磁悬浮和直流变频技术，大大提高了机组的性能。为探讨压缩机对水源热泵能效影响，为水源热泵选型提供参考，通过一个实际脱出水余热利用案例进行了水源热泵选型对比。结果表明，在常规螺杆机热泵能效只有2.4的条件下，磁悬浮热泵能效可以达到3.54，超过水源热泵余热利用能效标准，比原螺杆机方案节能率高32%。以电费单价1.0元/（kW·h）计，年节约运行电费117.33×10⁴元。磁悬浮热泵的能效、负荷调节性、可靠性、稳定性相比其他热泵技术更高，同时可减少现场维护工作，适合油田现场应用。

关键词:

电气化, 水源热泵, 磁悬浮热泵, 无油磁悬浮轴承, 高效节能