摘要
采用fluent软件对江苏某垃圾焚烧厂的烟气2级喷水减温流程分别进行了模拟,并根据模拟结果分析了反应塔和冷却塔内烟气的温度、流速、湿度等在塔内的径向分布情况。结果表明,冷却塔和反应塔在不同进口烟气温度下将烟气温度降低到各自相应同一值时所需喷水量的模拟值和实际值均具有较好的一致性,模拟结果具有一定的可靠性;冷却塔内烟气温度分别从200、210、220、230℃降低至170℃时,随着进口烟气温度的升高,喷水量的增加,烟气降温的速度越来越快,塔内烟气温度趋于稳定的高度越来越低,反应塔内烟气温度分别从160、170℃降低至150℃时,随着进口烟气温度的升高,喷水量的增加,塔内烟气温度趋于稳定的高度也越来越低;通过对冷却塔进口烟气温度为200℃和反应塔进口烟气温度为170℃时的喷水降温过程模拟,发现冷却塔内的降温效果明显好于反应塔,2塔的烟气流速分布基本相似,而烟气湿度分布稍有不同。
The fluent software was applied for numerical simulation the 2 steps spray desuperheating process of flue gas in a waste incineration power plant.Base on the simulated results,the distributing of flue gas temperature,flow rate,humidity on radial position in cooling tower and reacting tower were obtained.The quantity of spray water was investigated by this model,and the simulation results were compared with the experimental data.Results showed that the temperature of flue gas in two towers was falling gradually and then to a stable value,water spraying quantity and flue gas cooling speed were increased with increasing the inlet flue gas temperature.The higher of inlet flue gas temperature,the lower of height temperature in stable.The simulation results agreed to experimental results perfectly,which indicated that the model was reliable.The flue gas spray desuperheating process in cooling tower（inlet temperature 200 ℃） and reaction tower（inlet temperature 170 ℃） was simulated and compared,results showed that the cooling performance in cooling tower was better than that in reaction tower,the distributing characteristics of flow rate in two towers were similar,but the humidity distribution presented little difference.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2011年第7期27-31,35,共6页
Environmental Pollution & Control
基金
中国四川省生活垃圾焚烧及资源回收可行性研究项目
关键词
垃圾焚烧
计算流体力学
烟气降温
waste incinerator
computational fluid dynamics
flue gas cooling
