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富氧气氛下由于烟气量的减少以及锅炉热效率提高所带来的燃料量的减少使得烟气中的粉尘量得到一定的降低,为电站锅炉水平烟道烟气流速的提高带来了可能。增加烟气流速虽然强化了传热,但同时也增大了风机的电耗。采用基于初投资分摊费用和经营成本的动态费用分析法对不同烟气流速下对流受热面的换热进行经济性分析。计算结果表明,最佳工况比空气燃烧方式下的烟道更加紧凑,但是流速超过一定范围之后带来的引风机耗电量的增加超过了流速增加所带来的强化换热的收益,因此是不经济的。采用动态费用法为富氧燃烧方式下对流受热面最佳流速的选择提供依据,对新型富氧燃烧锅炉换热器的设计具有一定的指导意义。
In the oxygen-enriched atmosphere, the decrease of the amount of flue gas and the decrease of the amount of fuel caused by the increase of the thermal efficiency of the boiler reduce the amount of dust in the flue gas, which makes it possible to increase the flue gas velocity in the horizontal flue of a power station boiler. Increasing the flue gas flow rate, while enhancing heat transfer, also increases the power consumption of the fan. The dynamic cost analysis method based on the initial investment cost-sharing and operating cost is used to analyze the heat transfer of the convective heating surface under different flue gas flow rates. The calculation results show that the optimal operating conditions are more compact than the flue gas combustion, but the increase of power consumption of the induced draft fan after the flow rate exceeds a certain range exceeds the gain of enhanced heat transfer due to the increase of the flow rate It is uneconomical. Adopting the dynamic cost method to provide the basis for choosing the optimal flow velocity of the convection heating surface under the oxygen-rich combustion mode, which is of guiding significance for the design of the new oxygen-enriched combustion heat exchanger.