| In this paper,aiming at the problems of low thermal efficiency,insufficient combustion and energy waste when the traditional coal-fired furnace is used to heat the solar greenhouse in winter,a biomass hot air furnace is developed in combination with the natural environmental conditions in Xinjiang and the development needs of facility agricultural equipment technology.The research is carried out from the aspects of structural design,numerical simulation analysis,structural optimization and heating performance.The research contents and conclusions include the following points :A biomass hot blast stove was designed.The overall structure is composed of storage gasification system,combustion system,heat exchange system and flue dust removal system.The storage gasification system is downdraft type and the combustion system is blast type.The design of the primary combustion air supply device is the only main air supply source of the biomass hot blast stove.By controlling the overflow valve to control the air intake of the combustion system,the combustion speed of the hot blast stove is controlled,and the outlet temperature of the hot air of the heat exchange system is controlled to realize the automatic temperature control in the room.The designed secondary combustion air supply pipe can fully burn the biomass gas and unburned large particles after gasification.Heat exchange system is shell and tube type,flue dust removal system adopts cyclone structure design.The heat exchange system was optimized.In this paper,a simulation analysis model of the heat exchange process is established for the heat exchanger.The ANSYS Workbench platform is used to simulate and analyze the heat exchanger,and its accuracy is verified by experiments.In view of the structural design defects existing in the simulation results of the heat exchanger,the structure is optimized.According to the measured data,two primary assessment indexes of biomass hot blast stove performance were compared.The results showed that the average temperature of hot blast outlet increased by 17.9 % and the thermodynamic efficiency increased by 12.9 % after optimization.In order to evaluate the heating performance of the biomass hot blast stove,experimental research was carried out on different solar greenhouses using two types of biomass hot blast stoves before and after structural optimization.The thermal environment in the experimental greenhouse and the control greenhouse were compared and analyzed.Under the same field management system,the growth parameters such as plant height,diameter,photosynthetic rate,yield and fruit quality of crops were compared and analyzed.The solar greenhouse heated by biomass hot blast stove after structural optimization was obtained.The data of crop growth were better than those before structural optimization,and the average yield per mu increased by 16.7 %. |
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