高温烟气急冷过程数值模拟

Numerical simulation of the high-temperature flue-gas quenching process

为解决含氯有机废液、废气焚烧时高温烟气降温过程中会产生二噁英的问题,提出了高温烟气急冷工艺.将焚烧产生的高温烟气直接通入水槽中进行冷却,通过分析不同烟气温度、不同入口速度时烟气在冷却水槽中的温度、体积以及速度分布,得到高温烟气降温所需要的冷却水液面高度和溢流堰宽度随烟气温度和入口速度的变化规律,为工程实际应用提供理论基础.计算结果表明,高温烟气的温度越高,进入水槽的速度越大,所需冷却水液面高度越大,溢流堰宽度越大.

When incinerating chlorine-containing organic wastewater and waste gas, dioxins may be produced during flue-gas temperature drop. In order to bring down the formation of dioxins, the high-temperature flue-gas quenching process was suggested. The high- temperature flue gas from the incinerator was introduced directly into a water tank for cooling. By analyzing the temperature, volume and velocity distributions of the flue gas in the water tank at different inlet temperatures and velocities, the water level and overflow- dam width were obtained for high-temperature flue-gas quenching. The calculating results indicated that the water level and overflow-dam width increase with increasing inlet temperature and velocity of the flue gas.