静态螺旋切割强化湿法烟气脱硫技术研究
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摘要
湿法烟气脱硫技术是当今世界上应用最广泛的烟气脱硫手段,但是昂贵的基建和运行成本极大地限制了其进一步的发展。开发了一套喷射混合器组合螺旋切割强化气液传质的湿法烟气脱硫系统,考察了烟气SO_2质量浓度、脱硫剂质量分数、烟气流量以及脱硫剂循环流量对烟气脱硫效果的影响,并与喷射混合接触方式下的脱硫效果进行了对比实验研究。结果表明:当脱硫剂质量分数为15%,烟气SO_2质量浓度为3 000 mg/m~3,烟气流量为18 m~3/h,脱硫剂循环流量为250 mL/min的时候,系统脱硫效果最佳,出口烟气SO_2质量浓度为0 mg/m~3;静态螺旋切割气液接触方式下,系统脱硫率相较于单独喷射混合提高了7.64%。采用螺旋切割装置强化烟气脱硫,能够显著提高系统的烟气脱硫效率,可达到超净排放,并能实现湿法烟气脱硫系统的高效化、小型化。
Wet flue gas desulfurization is the most widely used flue gas desulfurization method in the world, but expensive infrastructure and operating costs limit its further development and application. A set of wet flue gas desulfurization system based on combination of spiral cutter and jet mixer by enhancing gas-liquid mass transfer was developed and the mass concentration of SO_2 in flue gas, desulfurizer mass fraction, flue gas flow rate, and desulfurizer flow rate were investigated. Moreover, the desulfurization effect of current method was compared with that of gas-liquid contact mode of jet mixing only. The results show that desulfurization efficiency of the system reaches the best when the mass fraction of desulfurizer is 15%, the mass concentration of flue gas SO_(2 )is 3 000 mg/m~3, the flue gas flow rate is 18 m~3/h and the circulating flow rate of desulfurizer is 250 mL/min, whose mass concentration of outlet SO_2 is 0 mg/m~3. And the removal efficiency of SO_2 enhanced by static spiral cutting is 7.64% higher than that of the jet mixing only. Therefore, the current developed method and equipment can improve the efficiency of flue gas desulfurization, meet standard of ultra-clean emission and make the wet flue gas desulfurization system higher efficiency and miniaturization.
Wet flue gas desulfurization is the most widely used flue gas desulfurization method in the world, but expensive infrastructure and operating costs limit its further development and application. A set of wet flue gas desulfurization system based on combination of spiral cutter and jet mixer by enhancing gas-liquid mass transfer was developed and the mass concentration of SO_2 in flue gas, desulfurizer mass fraction, flue gas flow rate, and desulfurizer flow rate were investigated. Moreover, the desulfurization effect of current method was compared with that of gas-liquid contact mode of jet mixing only. The results show that desulfurization efficiency of the system reaches the best when the mass fraction of desulfurizer is 15%, the mass concentration of flue gas SO_(2 )is 3 000 mg/m~3, the flue gas flow rate is 18 m~3/h and the circulating flow rate of desulfurizer is 250 mL/min, whose mass concentration of outlet SO_2 is 0 mg/m~3. And the removal efficiency of SO_2 enhanced by static spiral cutting is 7.64% higher than that of the jet mixing only. Therefore, the current developed method and equipment can improve the efficiency of flue gas desulfurization, meet standard of ultra-clean emission and make the wet flue gas desulfurization system higher efficiency and miniaturization.
引文
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[2] 袁进,江霞,刘一天,等.氧化锰共生矿烟气脱硫的机理及影响因素[J].环境工程学报,2018,12(4):1104-1111.
[3] 张立强.烟气循环流化床脱硫塔物料内循环特性研究[D].济南:山东大学,2008.
[4] KEPING Y,RUINIAN L,TIANLE Z,et al.A semi-wet technological process for flue gas desulfurization by corona discharges at an industrial scale[J].Chemical Engineering Journal,2005,116(2):139-147.
[5] 唐杰林.燃煤烟气脱硫脱硝技术研究进展[J].化工管理,2016(32):156.
[6] 周理明,史永永,李海洋,等.氨法烟气脱硫过程的工艺优化[J].化学工程,2014,42(4):7-12.
[7] HONGLIANG G,CAITING L,GUANGMING Z,et al.Flue gas desulphurization based on limestone-gypsum with a novel wet-type PCF device[J].Separation and Purification Technology,2011,76(3):4944-4951.
[8] 曹露.单塔双区高效石灰石-石膏湿法脱硫工艺在大型火电厂中的应用[J].环境污染与防治,2016,38(2):111-119.
[9] 林永明.大型石灰石—石膏湿法喷淋脱硫技术研究及工程应用[D].杭州:浙江大学,2006.
[10] 陈姣,袁舒欣,杨刚,等.一种文丘里雾化喷嘴设计[J].机械研究与应用,2015,28(2):114-115.
[11] 于鹏,蒋建忠,程坤.基于螺旋切割装置的富氧水制备及其工艺优化[J].轻工机械,2018,36(2):41-47.
[12] 程坤.富氧水制备装置的设计和试验研究[D].无锡:江南大学,2017.
[13] FENG D D,GAO J M,ZHANG Y,et al.Mass transfer in ammonia-based CO2 absorption in bubbling reactor under static magnetic field[J].Chemical Engineering Journal,2018,338(1):450-456.
[14] JIE W,WEN Q Z.Simultaneous desulfurization and denitrication of sintering flue gas via composite absorbent[J].Chinese Journal of Chemical Engineering,2016,24 :1104-1111.
[15] 米俊锋,潘一,杜胜男,等.接地极雾化电晕放电技术去除SO2的研究[J].化学工程,2016,44(5):6-10.
[16] KORMáNYOS B,NAGYPáL I,PEINTLER G,et al.Effect of chloride ion on the kinetics and mechanism of the reaction between chlorite ion and hypochlorous acid[J].Inorganic Chemistry,2004,47(17):7914-7920.
[17] LEHTIMAA T,TARVO V,MORTHA G,et al.Reactions and kinetics of Cl(III) decomposition[J].Industrial & Engineering Chemistry Research,2010,47(15):5284-5290.
[18] 王启军,亓晓东.湿法烟气脱硫工艺中喷淋塔传质性能的理论分析[J].山西能源与节能,2005(3):30-31.
[19] BAL R D,SI H L,JONG H J,et al.Study on the removal of NOx from simulated flue gas using acidic NaClO2 solution[J].Journal of Environmental Sciences,2008(1):33-38.
[20] PRANEEL J T,ROBERT R.Venturi tube calibration for airflow and volume measurement[J].Flow Measurement and Instrumentation,2018,60(4):236-241.