A concise algorithm for calculating absorption height in spray tower for wet limestone–gypsum flue gas desulfurization

Zhu, Jie; Ye, Shi-chao; Jie, Bai; Wu, Zewei; Liu, Zhenhua; Yang, Yunlei

doi:10.1016/j.fuproc.2014.07.002

Cited by 64 publications

(27 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The purification involves removing solid particles, nitrogen oxides and sulfur oxides. Desulfurization of gases is most often carried out with a wet lime method, consisting of spraying the gases with a solution of lime milk or limestone [1][2][3]. The desulfurization product is calcium sulfate -gypsum [4,5], which is separated from the wastewater.…”

Section: Introductionmentioning

confidence: 99%

Application of aluminum-based coagulants for improving efficiency of flue gas desulfurization wastewater treatment in coal – fired power plant

et al. 2019

View full text Add to dashboard Cite

Pollution released into the environment as the result of the combustion of energy fuels is a significant global threat. For instance, wastewater in coal–fired power plants is often heavily polluted by organic compounds, heavy metals and boron. Therefore, there is an urgent need for efficient flue gases and wastewater treatment. However, to be industrially implemented, the treatment processes have to be simultaneously effective and inexpensive. This research systematically studied the efficiency of inexpensive coagulation processes using aluminum-based coagulants applied to flue gas desulfurization (FGD) wastewater treatment. Additionally, the differences in the efficiency of total organic carbon (TOC) and chemical oxygen demand (COD) removal between sedimentation and coagulation processes were systematically studied. It was found that coagulation with the appropriate dose of PAX19XL coagulant achieved a satisfactory effect with significant boron removal and almost complete heavy metals removal. The polyelectrolyte use did not improve coagulation effectiveness and did not accelerate sludgesedimentation and volume decreasing. The detailed statistical analyses did not confirm the positive, pronounced effect of coagulation compared to sedimentation, although there were observed exceptions that should be considered separately. The results obtained suggest that inexpensive aluminum-based coagulants may be effective in improving the efficiency of flue gas desulfurization wastewater treatment in coal–fired power plants.

show abstract

Section: Introductionmentioning

confidence: 99%

Application of aluminum-based coagulants for improving efficiency of flue gas desulfurization wastewater treatment in coal – fired power plant

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Currently, the main instruments used in wet desulfurization include rotating packed beds, impinging stream reactors, and absorption towers, and the desulfurization rates of these three instruments are ≥ 80%, ≥ 90%, and 68%-90%, respectively (Chang et al, 2011;Gong and Yang, 2011;Wang et al, 2015;Kobayashi et al, 2016). Absorption towers are widely used in the desulfurization industry, but they exhibit problems such as a large land area required, high operation cost, and equipment corrosion and fouling (Michalski, 2000;Bao et al, 2012;Zhu et al, 2015). Although some wet flue-gas desulfurization (WFGD) technologies are available, more cost-effective and efficient equipment and technologies still need to be developed for the industry environment.…”

Section: Introductionmentioning

confidence: 99%

Application of Gas Cyclone-Liquid Jet Absorption Separator for Flue-Gas Desulfurization

Wang

Yang

et al. 2017

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

A gas cyclone-liquid jet absorption separator integrates the functions of cyclone separation, liquid jet atomization, and absorption separation. This study employed this device to conduct a wet flue-gas desulfurization experiment on a gas mixture consisting of air in room temperature and sulfur dioxide (SO 2 ) to explore this device's prospect of tail gas purification. Sodium hydroxide (NaOH) and sodium carbonate (Na 2 CO 3 ) solutions at various concentrations were used as absorbents under room temperature. The changes in the SO 2 removal efficiency and air pressure drop were investigated with parameters including total gas flow, SO 2 concentration in the flue gas, and absorbent flow. The SO 2 removal efficiency increased to a certain extent as the absorbent concentration, total gas flow, and absorbent flow increased. The maximum SO 2 removal efficiencies of NaOH and Na 2 CO 3 were 85% and 77%, respectively. Under identical experimental conditions, the changes in SO 2 removal efficiencies of NaOH and Na 2 CO 3 exhibited essentially identical trends, in which NaOH exhibited a 5%-8% greater SO 2 removal efficiency than Na 2 CO 3 .

show abstract

“…Some researchers point out smaller droplet diameter is beneficial for mass transfer but will cause local entrainment of droplets when droplet diameter is too small . However, they just use a droplet diameter, which is big enough to keep falling down in the whole column, then when the desulfurization efficiency cannot be afforded, a higher liquid flow rate is used to achieve the goal (Neveux: L/G = 20, u g = 2.33 m/s, d = 1.7 mm; Warych: L/G = 8–15, u g = 3 m/s, d = 2 mm–3 mm; Zhu: L/G = 10–20, u g = 2–4, d = 2‐3 mm; Gerbec: L/G = 36, u g = 2.09 m/s, d = 2.7 mm; Lin: L/G = 15, u g = 1.95 m/s). Two features can be found in these typical examples: (a) The gas velocity is not large, which can prevent the entrainment, but it will decrease the throughput of the column; (b) The L/G is large to provide sufficient interfacial area for mass transfer, but in a relatively big droplet diameter.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect between spraying layers on the performance of the WFGD spray column

Wang

Dai

2018

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

In a WFGD spray column, spraying droplets have dual duties of optimizing flow uniformity and providing interfacial area for mass transfer but have contradiction in selection of diameter. In this paper, a synergistic effect between smaller and bigger droplets is proposed to improve the performance of the column, which is to enlarge the interfacial area and optimize the flow uniformity in different layers, and it is used to create a novel design scheme. Through the study of the flow uniformity in the spray column, the detail of this design scheme is proposed as followed: The minimum flow rate and proper droplet diameter should be selected in the bottom layer to achieve the flow uniformity, and smaller droplets can be used in the rest layer to enlarge the interfacial area as much as possible. Compared with the traditional scheme, the liquid hold-up has increased 16%-30%, and the interfacial area has increased 32%-56% in novel scheme. In practice, this novel design scheme can provide reference and guidance for large scale spray columns. KEYWORDS droplet self-adjustment effect, flow uniformity, interfacial area, synergistic effect

show abstract

A concise algorithm for calculating absorption height in spray tower for wet limestone–gypsum flue gas desulfurization

Cited by 64 publications

References 32 publications

Application of aluminum-based coagulants for improving efficiency of flue gas desulfurization wastewater treatment in coal – fired power plant

Application of aluminum-based coagulants for improving efficiency of flue gas desulfurization wastewater treatment in coal – fired power plant

Application of Gas Cyclone-Liquid Jet Absorption Separator for Flue-Gas Desulfurization

Synergistic effect between spraying layers on the performance of the WFGD spray column

Contact Info

Product

Resources

About