摘要
为实现高效回收脱硫浆液余热,必须探究不同工艺对泵功的影响,不凝结气体温度、压力和溶解度对闪蒸影响。针对石灰石-石膏、镁法、双碱法脱硫工艺,应用Aspen Plus进行物性仿真。气体溶解度与压力成正比,非线性,各工艺的CO_2与SO_2的含量相近,在10 kPa都未超过33 kg/h。SO_2与CO_2含量尽不相同,与反应成分有关,石灰石法中SO_2与CO_2含量在100 kPa时是在10 kPa时的8.1倍,镁法与双碱法各为7.02倍与6.89倍。低压中比凝结气体的比重更小,利于水的回收,不凝结气体的蓄热能力弱,低压时对余热回收影响不大。各工艺的泵功压力曲线皆为双凹线,中间有拐点,分别为14 kPa、13.1 kPa与12.3 kPa。综合闪蒸效率与泵功消耗,三种工艺的尾部压力不宜低于11 kPa。
To recover the waste heat of desulfurization slurry more efficiently, it is necessary to investigate the effect of different technologies on pump work. And the effect of non-condensation gas temperature,pressure and solubility on flash evaporation were also studied. Aspen Plus was carried out to simulate limestone-gypsum, magnesium and double alkali desulphurization processes. The gas solubility is non-linear and proportional to pressure. The CO 2 and SO 2 in different processes are similar and lower than 33 kg/h at 0.1 bar. The content of SO 2 and CO 2 are different which related to the reaction compoents. In limestone method, the content of SO 2 and CO 2 at 0.1 bar are 8 times than that at 1bar. For magnesium method and double alkali method, this ratio can reach 7.02 and 6.89. In low pressure condition, the content of non-condesation gas is lower which is helpful to water recycle. The heat storage capacity of non-condesation gas is so weak that have little impact on heat recovery at low pressure. Pump work pressure curves of all technologies are double concave lines with an middle inflection point which are 0.14 bar, 0.131 bar and 0.123 bar respectively. With flashing efficiency and pump work consumption being considered, the tail pressure should not be lower than 0.11 bar.
作者
于经伟
高建民
王伟业
杜谦
吴少华
YU Jing-wei;GAO Jian-min;WANG Wei-ye;DU Qian;WU Shao-hua(School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
出处
《节能技术》
CAS
2019年第1期21-26,52,共7页
Energy Conservation Technology
基金
国际科技合作项目(2010DFA24580-502)
