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真空锅炉以其高效节能的优点已在暖通空调及锅炉领域引起了广泛的关注,然而其实际运行中的换热效率却总是达不到理论计算值,基于真空锅炉的换热机理理论研究目前也基本处于空白状态。文章中以一台供热量为0.35MW的真空锅炉样机的结构尺寸与运行工况为基础,使用EES软件,对该锅炉换热器的换热性能进行理论模拟。通过比较实际工况参数与理论计算参数,得出实际换热系数仅为理论换热系数的50%,导致实际换热系数低下的原因主要为,实际冷凝换热系数仅为理论冷凝换热系数的23%。同时提出如果改用铝管作为换热管,能将换热系数提高30%左右。
Due to its advantages of high efficiency and energy saving, vacuum boilers have drawn much attention in the field of HVAC and boiler. However, the heat transfer efficiency in practical operation always fails to reach the theoretical value. Based on the theory of heat transfer mechanism in vacuum boilers, At present, it is basically in a blank state. Based on the structure and operating conditions of a vacuum boiler sampler with a heating capacity of 0.35MW, EES software was used to simulate the heat transfer performance of the heat exchanger of the boiler. The actual heat transfer coefficient is only 50% of the theoretical heat transfer coefficient by comparing the actual operating parameters with the theoretical calculation parameters. The reason for the low actual heat transfer coefficient is that the actual condensation heat transfer coefficient is only the theoretical condensation heat transfer coefficient Of the 23%. At the same time, if the switch to aluminum tubes as heat exchange tubes, the heat transfer coefficient can be increased by about 30%.