Abstract:

Compared with conventional steam boilers, slightly-pressurized submerged combustion evaporator is advantageous, which is in the absence of a heat transfer surface, with higher efficiency of heat transfer and lower emission of pollutants.Pressurized submerged combustion evaporator (PSCE）reported in this paper is its extension to high pressures and temperatures.Based on the first law of thermodynamics and with the consideration of energy consumption of compressors in PSCE and fans in steam boiler, the PSCE is compared with the steam injection boiler under the same condition.For 8—21 MPa steam, although the energy consumption of compressors constitutes a large proportion of the whole energy consumption in PSCE, the heating efficiency is high and the heat recovery of PSCE is effective.The energy saving rate of PSCE is estimated, which is usually 6%—12%.The results show that PSCE has a greater potential for energy saving than steam boiler.