| Most of the winter heating in the rural areas of northern China is based on burning loose coal and fuel wood,which has a low combustion efficiency and serious environmental pollution.Clean heating in rural areas is a pressing problem concerning the construction of China’s environmental environment,and a major livelihood issue.At present,the state is vigorously promoting clean heating methods such as"coal to electricity","coal to gas"and renewable energy,and despite a series of achievements,there are still certain drawbacks and limitations of a single energy source.To solve this problem,combining the biomass resource conditions and building characteristics in the rural areas of northern China,building a locally adapted biomass coupled multi-source cooperative heating system is an effective way to solve the problem of clean rural heating.Under the support of the National Key Research and Development Program of China(2020YFD1100302),a comprehensive demonstration of clean utilization technology of village resources in northeast China,clean heating technology,and a demonstration of low-NO_xcombustion of biomass mixture.Focusing on the key technical bottlenecks that restrict clean heating in rural areas,the project was combined with the construction of clean heating demonstration projects in villages and towns to build a clean heating system based on low nitrogen combustion of biomass with multiple complementary heat sources in Miao Fu’an community in Linyi County,Dezhou City.This paper introduces the biomass coupled multi-source heat pump cooperative heating system.A transient model for cooperative heating is constructed based on TRNSYS software,and transient simulations are calculated and analyzed according to the transient mathematical model and set parameters of the main equipment.The investment and operating costs of the system are fully considered,and the minimum annual cost is taken as the optimization target.Based on the dynamic balance between the building load and the heating load,the heat source equipment capacity ratio and control strategy of the heating system scheme is optimized so that the optimization results are more in line with the actual project operating conditions.Based on a full investigation of local building conditions,resource conditions,and climate characteristics,a multi-source synergistic heating system with a biomass boiler coupled with an air source heat pump and a geothermal heat pump was constructed,and the dynamic optimization results showed that the optimal configuration of the coupled system was 500 k W for the biomass boiler,310 k W for the geothermal heat pump and 251k W for the air source heat pump.This has been used as the basis for the construction and operational research of the demonstration site project,with real-time data collection through an intelligent monitoring platform.The biomass coupled multi-source heat pump cooperative heating system and the electric heating+multi-source pump heating system were tested,respectively.The test results show that the biomass coupled multi-source heat pump cooperative heating system operates significantly better than the heat pump system and has lower operating costs than the electric heating+multi-source heat pump system.System evaluation of the coupled system with the electric heating+multi-source heat pump heating system,biomass boilers,and coal-fired boilers showed that the biomass coupled multi-source heat pump synergistic heating system has significant advantages in three aspects:economic benefits,environmental benefits,and energy consumption.The operational results of the demonstration project show that the biomass coupled multi-source heat pump cooperative heating system and the optimization method proposed in this paper provide an"affordable and good"sustainable clean heating solution for rural areas in the north. |
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