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Investigation and optimization of the depth of flue gas heat recovery in surface heat exchangers

机译：地面热交换器烟气余热回收深度的研究与优化

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Economic issues associated with designing deep flue gas heat recovery units for natural gas-fired boilers are examined. The governing parameter affecting the performance and cost of surface-type condensing heat recovery heat exchangers is the heat transfer surface area. When firing natural gas, the heat recovery depth depends on the flue gas temperature at the condenser outlet and determines the amount of condensed water vapor. The effect of the outlet flue gas temperature in a heat recovery heat exchanger on the additionally recovered heat power is studied. A correlation has been derived enabling one to determine the best heat recovery depth (or the final cooling temperature) maximizing the anticipated reduced annual profit of a power enterprise from implementation of energy-saving measures. Results of optimization are presented for a surface-type condensing gas-air plate heat recovery heat exchanger for the climatic conditions and the economic situation in Tomsk. The predictions demonstrate that it is economically feasible to design similar heat recovery heat exchangers for a flue gas outlet temperature of 10°С. In this case, the payback period for the investment in the heat recovery heat exchanger will be 1.5 years. The effect of various factors on the optimal outlet flue gas temperature was analyzed. Most climatic, economical, or technological factors have a minor effect on the best outlet temperature, which remains between 5 and 20°С when varying the affecting factors. The derived correlation enables us to preliminary estimate the outlet (final) flue gas temperature that should be used in designing the heat transfer surface of a heat recovery heat exchanger for a gas-fired boiler as applied to the specific climatic conditions.
机译：研究与设计天然气锅炉深烟气热回收装置有关的经济问题。影响表面式冷凝式热回收热交换器的性能和成本的主要参数是传热表面积。燃烧天然气时，热回收深度取决于冷凝器出口处的烟气温度，并确定冷凝水蒸气的量。研究了热回收热交换器中出口烟气温度对额外回收的热功率的影响。已经得出了一种相关性，使人们能够确定最佳的热回收深度（或最终冷却温度），从而最大程度地实现电力企业因实施节能措施而减少的预期年度利润。针对托木斯克的气候条件和经济状况，提出了表面式冷凝式气-气板式热回收热交换器的优化结果。这些预测表明，为烟气出口温度为10°C设计类似的热回收热交换器在经济上是可行的。在这种情况下，热回收热交换器投资的投资回收期将为1.5年。分析了各种因素对最佳出口烟气温度的影响。大多数气候，经济或技术因素对最佳出口温度的影响较小，当改变影响因素时，最佳出口温度保持在5至20°С之间。推导的相关性使我们能够初步估计在设计用于特定气候条件的燃气锅炉的热回收热交换器的传热表面时应使用的出口（最终）烟气温度。

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