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  • 影响废气吸收塔吸收效率的因素
  • 本站编辑:杭州恒创环保科技有限公司发布日期:2018-01-09 10:58 浏览次数:
1、废气吸收塔塔顶循环量偏小,液体流率和填料湿润情况均不理想。由于尾气中AN在水中溶解度不大(7.35%,25℃),在吸收过程中,其传质阻力主要集中于液相,故在原操作条件下,塔内液体流率和填料湿润情况限制了填料塔内传质系数的提高。
1. The top cycle of the exhaust gas absorption tower is small, and the liquid flow rate and the wetting condition of the packing are not ideal. Because the solubility of AN in tail gas is not large (7.35%, 25 C) in the water, the mass transfer resistance is mainly concentrated in the liquid phase during absorption. Therefore, under the original operation conditions, the liquid flow rate in the tower and the wetting condition of the packing limit the increase of mass transfer coefficient in the packed column.
2、喷嘴分布效果差。喷嘴喷淋范围集中于塔填料一侧,同时部分喷淋水沿塔壁下流,实际上部分填料没有发挥吸收能力,降低了塔的吸收效率。
2. The effect of nozzle distribution is poor. The nozzle spray range in packing dirty side, while part of the spray water along the tower wall, actually did not play the part of filler absorption capacity, reduce the efficiency of absorption tower.
3、气体夹带液体雾滴。在风机运行时,喷嘴射出的喷淋水一部分被气流夹带上行,由于设备原设计中并无除雾装置,该部分含AN液滴经过汽化,被直接排放到大气中,导致外排废气AN居高不卜。
3. Gas entrainment liquid droplets. In the fan operation, nozzle spray water part by air entrainment upstream, because no demisting device equipment in the original design, the AN containing droplets after vaporization, is directly discharged into the atmosphere, resulting in waste AN high.
4、工业废气吸收塔的塔顶液相丙烯腈含量偏高。由于塔顶新鲜水补加量受工艺条件限制,无法继续提高(回收水罐仅能处理废水4~5m3/hr),使得塔顶液相中丙烯腈含量偏高(12200ppm),全塔吸收推动力减小,如继续提高塔顶补加水量,则只有将部分含AN污水直排,从而对下游污水造成冲击,同时在较高补加水量的情况卜,吸收塔液位也难以控制。
4. The content of the liquid acrylonitrile in the top of the tower is higher than that of the industrial waste gas absorption tower. Due to the addition of fresh water by process conditions, can not continue to improve (recovery tank can only deal with 4~5m3/hr, the wastewater) makes the liquid phase high acrylonitrile content (12200ppm), the whole tower absorption driving force is reduced, such as to improve the added amount of water, only part of AN containing sewage straight row, which impact on the at the same time in the downstream of sewage, high added water the Bu, absorption tower level is also difficult to control.
六、废气吸收塔的应用
Six. Application of exhaust gas absorption tower
废气吸收塔可应用于各种行业、吸收的气体种类、浓度、温度等技术条件不尽相同,塔所回收的产品种类也不一样,所以,本系列设备应根据实际条件进行针对性地设计选型,为用户量身定作具有实用性、经济性的废气吸收塔。
Can be used in various industries waste gas absorption and absorption type, gas concentration and temperature conditions are not the same, the recovery tower products are not the same, so, this series of equipment should be targeted to design selection according to the actual conditions, provide users tailor-made has practical and economical waste gas absorption tower.
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