AN ALTERNATE APPROACH TO FLUE GAS HEAT RECOVERY

摘要

Many solid fuel-fired boilers are equipped with an economizer and air heater (Figure 1) to provide economical heat recovery and hot air for good combustion. There are practical limitations to how much energy a given economizer/air heater arrangement can absorb. An economizer is limited by the water-side approach to saturation temperature and feedwater inlet temperatures. This is especially true for power plants seeking maximum cycle efficiency by utilizing multiple feedwater heaters. Similarly, an air heater is limited by combustion equipment air temperature requirements and dew point considerations.