Research On Thermal Performance Of The New Type Energy-saving Stove And The Collectors Built-in Firewall

With the continuous development of the rural economy and the increasing of living standard, people’s demand for indoor thermal comfort environment is gradually increasing. However, the progress of agricultural science and technology makes the biomass fuel consumption rate decrease year by year, and the heating energy consumption gradually turn to commercial energy. The residual biomass fuels are burned in the open air, which not only increase the pressure on the energy crisis, but also cause serious environmental pollution. How to improve the utilization of biomass fuel and improve the structure of rural energy consumption will become the focus of people’s attention.Rural life’s energy can be generally provided by burning biomass fuels stove, including cooking, living hot water and indoor heating energy. How to improve the utilization ratio of biomass fuels has been gradually paid more attention. At present, thermal utilization rate of the biomass fuels of stove body which has the built-in water heat collector can reach more than 70%. The main research content of this paper is based on this stove, to reduce the processing material and cost to improve the structure of the stove, and analyze the thermal performance of the new type energy-saving stove through the experimental test. At the same time, the impact of internal and external factors on the thermal performance of stoves was explored by changing experimental conditions.Through the experimental test and comparative analysis, the thermal utilization rate of the biomass fuels stove could reach up to 72% averagely, and the comprehensive thermal efficiency can reach up to 84% . Inner stove ash and retaining ring of fire were conducted to improve the percentage of cooking heat gain. However, inner stove ash and retaining ring of fire would reduce the percentage of collector heat gain and had little effect on the flue gas heat gain. Eventually, the thermal utilization rate of biomass fuel decreased by 2.41%and 7.07% respectively in the function of inner stove ash and retaining ring of fire. The change of fuel mass prolonged the time of the system in the evaporation stage, and increased the heat quantity. However, the change of fuel mass didn’t affect the heat utilization rate of the stove. Different system terminal forms lead to the part heat percent gap slightly in the different stages, but had little effect on the thermal utilization rate of the stove. The heating efficiency of the new energy-saving stoves combined with Kang heating system could reach up to 68%. According to the results of a large number of experimental tests, the relationship between the heat energy and the total amount of fuel in the new energy saving stove was summarized, which could be used to obtain the mass of different fuels according to the indoor heat demand.Based on the new type of energy-saving stoves in the structure of heat collectors, a new firewall built-in the collector was designed in this paper combined with the more common firewall heating system used in the northern region. The groove type structure increased the area of heating surface to 2 times of the original. Through the test analysis, the heating supply efficiency was increased from 35% to 68% by the heating system application of the new firewall built-in the collector.Through developing and improving the heating equipment, the heating efficiency of the heating system in rural areas continues to improve. The study of heating systems will greatly increase the utilization rate of biomass fuel, and reduce the use of coal and other commercial energy. Furthermore, it has important significance to improve the environment quality and promote the development of energy-saving emission reduction policies.