液气燃料烟气的最大余热量与节能率计算研究

在中国能源结构中,燃油与天然气所占比例迅速上升.燃烧后排烟温度一般为160℃~180℃,仍含有较多能量,可以二次利用.本文通过对液、气体燃料中具有代表性的0号轻质柴油及天然气烟气的余热量与节能率进行计算,发现低温烟气余热中的水蒸气余热量占有很大比例,柴油烟气为55.08%,天热气烟气为79.41%.回收烟气余热,尤其是其中水蒸汽的潜热对低温烟气的热回收具有重要意义.若有效回收利用,既是对一次能源的二次利用,更符合"十三五"期间国家节能减排的相关政策要求.

Calculation of Maximum Waste Heat and Recovery Rate of Liquid and Gas Fuels

The consumption of various liqui d oil and gas fuel grows rapidly in Chinese energy structure. The discharged flue's temperature is generally 160℃ ~180℃ after these fuels are combusted. This part of energy can be used as secondary energy, though whose grade is low. A lot of H elements are in the form of liquid and gas fuels, and the vapor is the flue's main ingredi-ents. In this paper, the waste heat quantity and recovery rate of 0# light diesel oil and natural gas's flue is calculated, whose tem-perature is from 180℃ to 25℃ at the condition of 1 atm. In the 0# light diesel's flue, the residual heat's proportion of the vapor's heat is about 55. 08%. In the natural gas's flue, which proportion is about 79. 41%. Moreover, the vapor's latent heat is about 3/4. Therefore, recovering the latent heat of vapor is of great significance for the heat recovery of the low temperature waste heat.