生物质热风炉传热过程的数值分析及结构优化

Numerical Analysis and Structure Optimization of Heat Transfer Process in Biomass Hot Blast Stove

为解决日光温室所使用传统燃煤热风炉存在的热效率低、污染环境、浪费能源等问题,研制了一种生物质热风炉,主要由储料系统、燃烧系统、热交换系统、烟道除尘系统及温控系统组成。由于其热交换系统性能直接影响设计的实用性、经济型和可靠性,因此根据生物质热风炉热交换器的结构特点,建立了传热过程的数值分析模型,并采用数值模拟软件ANSYA对设备进行了数值分析研究及验证。同时,针对热交换器存在的问题,对结构进行优化设计,结果表明:改进后的结构明显优于原结构,在表征性能的两个主要评价指标中,空气平均出口温度提高了11.76%,热效率提高了13.86%。

In order to solve the problems of low thermal efficiency,environmental pollution and energy waste in traditional coal-fired hot blast stove used in solar greenhouse,a biomass hot blast stove was developed.The whole structure consisted of storage system,combustion system,heat exchange system,flue dust removal system and temperature control system.The performance of the heat exchange system directly affects the practicability,economy and reliability of this design.According to the structural characteristics of the heat exchanger of the biomass hot blast stove,this paper establishes a numerical analysis model of the heat transfer process,and uses the numerical simulation software ANSYA to carry out the numerical analysis and verification of the equipment.In view of the existing problems of the heat exchanger,the structure is optimized.The data show that the improved new structure is significantly better than the original structure.Among the two main evaluation indexes of the performance,the average outlet temperature of the air increases by 11.76%,and the thermal efficiency increases by 13.86%.