Experimental Study on Characteristics of Spraying Evaporation Flow of FGD Wastewater in Flue Gas

doi:10.12096/j.2096-4528.pgt.19152

Abstract

Abstract:

The complete evaporation of flue gas desulfurization (FGD) wastewater droplets before they reach the flue duct wall is the key of safe operation of FGD wastewater treatment system in tail flue duct in thermal power plants. The main characteristics of spray evaporation include pneumatic behaviors such as breakup and polymerization, influence mechanism of droplet group size distribution and velocity. A wind tunnel was designed and constructed, and the particle size distribution and velocity of the sprayed droplet group were measured and analyzed by laser particle size analyzer and particle image velocimetry (PIV) system in different inlet conditions of injected gas pressure, nozzle water flow rate, wind speed and air heating temperature. The experimental results show that the droplets injected from the nozzle are relative bigger initially and will become smaller because of breakup. Then the droplets are polymeric. The initial particle size of the droplet is only related to the injected gas pressure and water flow. The increase of wind speed will slightly contribute to the aggregation between the droplets. Increasing the pressure of the gas, temperature, wind speed, and reducing the water flow will all contribute to the speed of the droplet group. Especially, the effect of wind speed is more obvious. The results provide the reference for the spray numerical simulation and improvement direction of spray evaporation in engineering application.

Key words: spray and evaporate, droplet breakup, droplet diameter, average velocity

CLC Number:

TM621

Wenqing WU,Xiaoze DU,Lijun YANG. Experimental Study on Characteristics of Spraying Evaporation Flow of FGD Wastewater in Flue Gas[J]. Power Generation Technology, 2020, 41(5): 561-569.

References

1	张志荣,冉景煜.火电厂湿法烟气脱硫废水喷雾蒸发处理方法关键问题研究[D].重庆:重庆大学, 2011.
1	Zhang Z R, Ran J Y.Study on key problems of the thermal power plant FGD waste water with evaporation treatment[D].Chongqing: Chongqing University, 2011.
2	李文鼎, 高惠华, 蔡文丰. 石灰石-石膏湿法脱硫吸收塔结垢分析及预防措施[J]. 发电技术, 2019, 40 (1): 51- 55.
2	Li W D , Gao H H , Cai W F . Scaling analysis and preventive measures of limestone-gypsum wet flue gas desulfurization[J] Power Generation Technology, 2019, 40 (1): 51- 55.
3	吴优福, 刘捷, 海玉琰, 等. 超超临界1000 MW机组脱硫废水零排放技术[J]. 热力发电, 2017, 46 (5): 108- 110.
3	Wu Y F , Liu J , Hai Y Y , et al. Discussions on zero-discharge technology of desulfurization wastewater for ultra supercritical units[J] Thermal Power Generation, 2017, 46 (5): 108- 110.
4	谈宾宾, 李超. 火力发电厂烟气脱硫废水处理工艺研究[J]. 化工管理, 2016, (36): 146.
4	Tan B B , Li C . Study on the treatment process of flue gas desulfurization wastewater from fossil-fuel power station[J] Chemical Enterprise Management, 2016, (36): 146.
5	叶春松, 操容, 梁巍, 等. 脱硫废水高温烟气蒸发过程中氯盐和铵盐的分解[J]. 发电技术, 2019, 40 (4): 362- 366.
5	Ye C S , Cao R , Liang W , et al. Decomposition of chloride and ammoniate in the evaporation process of desulfurization wastewater with high temperature flue gas[J] Power Generation Technology, 2019, 40 (4): 362- 366.
6	禾志强, 祁利明. 火力发电厂烟气脱硫废水处理工艺[J]. 水处理技术, 2010, 36 (3): 133- 135.
6	He Z Q , Qi L M . Wastewater treatment process of flue gas desulfurization in the power plant[J] Technology of Water Treatment, 2010, 36 (3): 133- 135.
7	Deng J , Pan L M , Chen D Q , et al. Numerical simulation and field test study of desulfurization wastewater evaporation treatment through flue gas[J] Water Science & Technology, 2014, 70 (7): 1285- 1291.
8	周正, 吴畏, 郑昕, 等. 喷嘴雾化特性及脱硫废水蒸发数值模拟[J]. 化工进展, 2018, 37 (1): 32- 38.
8	Zhou Z , Wu W , Zheng X , et al. Experimental research on spray characteristics of nozzle and numerical simulation of desulfurization wastewater evaporation[J] Chemical Industry and Engineering Progress, 2018, 37 (1): 32- 38.
9	连鹏, 王凯亮. 脱硫废水烟气蒸发处理技术的分析及应用[J]. 华电技术, 2018, 40 (10): 59- 62.
9	Lian P , Wang K L . Analysis and application of flue gas evaporation treatment technology for desulfurization wastewater[J] Huadian Technology, 2018, 40 (10): 59- 62.
10	Hou Y , Tao Y J , Huai X L , et al. Numerical characterization of multi-nozzle spray cooling[J] Applied Thermal Engineering, 2012, 39, 163- 170.
11	刘秋生. 烟气脱硫废水"零排放"技术应用[J]. 热力发电, 2014, 43 (12): 114- 117.
11	Liu Q S . Application and comparison of discharge technology for desulfurization waste water[J] Thermal Power Generation, 2014, 43 (12): 114- 117.
12	Ma S C , Chai J , Chen G , et al. Research on desulfurization wastewater evaporation:Present and future perspectives[J] Renewable & Sustainable Energy Reviews, 2016, 58, 1143- 1151.
13	Yang S Z , Li X S , David L S , et al. In-nozzle flash boiling flow of multi-component fuel and its effect on near-nozzle spray[J] Fuel, 2019, 55- 67.
14	Saha K , Som S , Battistoni M , et al. Numerical simulation of internal and near-nozzle flow of a gasoline direct injection fuel injector[J] Journal of Physics:Conference Series, 2015, 656, 012100.
15	Montazeri H , Blocken B , Hensen J L M . Evaporative cooling by water spray systems:CFD simulation, experimental validation and sensitivity analysis[J] Building & Environment, 2015, 83, 129- 141.
16	Orzechowski T , Wcislik S . Analysis of D2-law in case of Leidenfrost drop evaporation[J] Experimental Thermal & Fluid Science, 2014, 59, 230- 237.
17	Turns S R . An introduction to combustion:concepts and applications[M]. Beijing: Tsinghua University Press, 2015.
18	马力, 仇性启, 王健, 等. 单液滴蒸发影响因素实验研究[J]. 现代化工, 2013, 33 (1): 103- 106.
18	Ma L , Qiu X Q , Wang J , et al. Experimental research on single droplet evaporation factors[J] Modern Chemical Industry, 2013, 33 (1): 103- 106.
19	陶垚.喷雾直接蒸发冷却过程数值模拟与实验研究[D].重庆:重庆大学, 2014.
19	Tao Y.Numerical simulation and experimental study of heat and mass transfer mechanisms of droplet evaporation[D].Chongqing: Chongqing University, 2014.
20	张志荣, 冉景煜. 废水液滴在低温烟气中的蒸发特性数值研究[J]. 环境工程学报, 2011, 5 (9): 2048- 2053.
20	Zhang Z R , Ran J Y . Numerical study on evaporation characteristics of waste water droplet in low temperature flue gas[J] Chinese Journal of Environmental Engineering, 2011, 5 (9): 2048- 2053.
21	王少龙.脱硫废水雾化试验及模拟研究[D].武汉:华中科技大学, 2016.
21	Wang S L.Experiment test and numerical simulation on the thermal power plant FGD waste water with evaporation treatment[D].Wuhan: Huazhong University of Science and Technology, 2016.
22	Alkhedhair A , Guan Z , Jahn I , et al. Water spray for pre-cooling of inlet air for natural draft dry cooling towers-experimental study[J] International Journal of Thermal Sciences, 2015, 90 (90): 70- 78.
23	马双忱, 柴峰, 吴文龙, 等. 脱硫废水烟道喷雾蒸发的数值模拟[J]. 计算机与应用化学, 2016, 33 (1): 47- 53.
23	Ma S C , Chai F , Wu W L . The numerical simulation of flue gas desulphurization wastewater spray evaporation[J] Computers and Applied Chemistry, 2016, 33 (1): 47- 53.
24	李洪波.内混式空气雾化喷嘴内流对雾化效果影响试验研究[D].西安:长安大学, 2018.
24	Li H B.Experimental study on the influence of internal flow on atomization effects of an internal-mixing air-assisted atomizer[D].Xi'an: Chang'an University, 2018.
25	穆文乐.内混式空气助力喷嘴喷雾特性的试验及数值模拟研究[D].西安:长安大学, 2014.
25	Mu W L.Experiment research and numerical simulation on spray characteristics of an internal mixing air-blast-atomizer[D].Xi'an: Chang'an University, 2014.
26	Yubiao S , Alkhedhair A M , Zhiqiang G , et al. Numerical and experimental study on the spray characteristics of full-cone pressure swirl atomizers[J] Energy, 2018, 160, 678- 692.
27	朱长安.基于红外热成像的热表面附近气流场测量技术的研究[D].哈尔滨:哈尔滨工业大学, 2017.
27	Zhu C A.Study on technique of airflow field measurement near heated surfaces based on infrared thermal image[D].Harbin: Harbin Institute of Technology, 2017.
28	Boomsma A, Bhattacharya S, Troolin D, et al.PIV uncertainty: computational & experimental evaluation of uncertainty methods[Z].TSI, 2015.
29	Sciacchitano A , Wieneke B . PIV uncertainty propagation[J] Measurement Science & Technology, 2016, 27 (8): 084006.
30	曹建明. 射流表面波理论的研究进展[J]. 新能源进展, 2014, 2 (3): 165- 172.
30	Cao J M . Theoretical investigation evolvement of surface waves in liquid jet sprays[J] Advances in New and Renewable Energy, 2014, 2 (3): 165- 172.
31	Feng S , Xiao L , Ge Z , et al. Parameter analysis of atomized droplets sprayed evaporation in flue gas flow[J] International Journal of Heat and Mass Transfer, 2019, 129, 936- 952.

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