RESEARCH AND DEVELOPMENT OF VERY HIGH PERFORMANCE BOILER WITH OXYGEN COMBUSTION AND LATENT HEAT RECOVERY FROM EXHAUST GAS

摘要

Recently, energy conservation has progressed in both areas of industry and domestic use. However, some original hardware could not support the above progress, because their efficiency performance was saturated by the energy conservation target. For instance, the thermal efficiency performance of a boiler is kept at 90% LHV which seems to leave only a small possibility of improvement of a few percentage points or less. Considering the thermal efficiencies based on LHV and HHV, the former does not include latent heat and its LHV value will be higher than that of HHV by a few percentage points. When we succeed in recovering the latent heat from exhaust gas, the thermal efficiency of the boiler may exceed 100% LHV but not 100% HHV, Next, both the exhaust gas volume and the thermal efficiency of the boiler are affected by the oxygen content of oxidizer. Therefore, we conduct the research and development of oxygen combustion and latent heat recovery to improve the thermal efficincy perform- ance of the boiler. Our test results showed that it is possible to have a very high thermal efficiency of about 105% LHV and 98% LHV with oxygen rich combustion and latent heat recovery from exhaust gas.