Primary Research of a New Zero-Liquid-Discharge Technology of Wet Flue Gas Desulfurization Wastewater by Low-Rank Heat from Flue Gas
Primary Research of a New Zero-Liquid-Discharge Technology of Wet Flue Gas Desulfurization Wastewater by Low-Rank Heat from Flue Gas
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烟气低阶热湿法烟气脱硫废水零液排放新工艺初探
DOI：
10.3390/en14144259
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发表时间：
2021-07
期刊：
影响因子：
3.2
通讯作者：
Yang Hairui
中科院分区：
文献类型：
--
作者：
Yao Xuan;Zhang Man;Deng Boyu;Yang Xinhua;Yang Hairui
湿法烟气脱硫(WFGD)废水处理是燃煤电厂面临的关键问题。传统的化学沉淀法无法达到零液体排放(ZLD)。本文提出了一种利用烟道气低品位热能浓缩ZLD废水的新工艺。搭建了洗涤器对浓缩过程进行了验证，并对浓缩水的特性进行了分析。用Ca(OH)2中和浓缩水，提高pH值。可将废水浓缩10~25倍，以降低流量。通过投加石灰对浓缩废水的特性进行了研究。然后用压滤法进行液固分离，得到的液体主要由CaCl2组成，占73.6%。污泥由CaSO4和Mg(OH)2组成，具体取决于投加过程中的石灰消耗量。最后，压滤机后的滤液与灰分混合，达到零液体排放，污泥与煤混合后焚烧或由第三方供应商处置。该技术在某600 MW机组上得到了验证，具有较高的系统可靠性。在蒸发过程中，WFGD废水循环使用净水。结合国家环保政策和WFGD废水的巨大市场需求，该技术具有广阔的应用前景。
Wet flue gas desulfurization (WFGD) wastewater treatment is a key problem in coal-fired plants. Traditional chemical precipitation methods cannot reach zero-liquid discharge (ZLD). In this paper, a new technology using the low-rank heat from flue gas to concentrate the wastewater for ZLD is proposed. A scrubber was built to verify the concentrating process, and the characteristics of the concentrated water were analyzed. The concentrated water was neutralized by adding Ca(OH)2 to raise the pH value. The wastewater can be concentrated 10~25 times to reduce the flow rate. The characteristics of the concentrated wastewater were studied by dosing lime. Then, liquid and solids were separated by filter pressing, the liquid was mainly composed of CaCl2, which accounts for 73.6%. The sludge is composed of CaSO4 and Mg(OH)2, depending on the lime consumption of the dosing process. Finally, the filter liquor after the filter press was mixed with ash to reach zero liquid discharge, and the sludge could be burnt after mixing with the coal or disposed by third-part vendor. This technology is demonstrated in one 600 MW unit and shows a high system reliability. The clean water is recycled by the WFGD wastewater during the evaporation. Binding on the environmental policies and large market demand of the WFGD wastewater, this technology shows a great application prospect in the future.
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影响因子：
3.2
作者：
K. Robinson
通讯作者：
K. Robinson
影响因子：
3.2
作者：
M. Tańczuk;M. Masiukiewicz;S. Anweiler;R. Junga
通讯作者：
M. Tańczuk;M. Masiukiewicz;S. Anweiler;R. Junga
DOI：
10.1080/00908319608908778
发表时间：
1996-06
期刊：
Energy Sources
影响因子：
--
作者：
B. Chowdhury
通讯作者：
B. Chowdhury
pH对自养同步脱硫反硝化过程中元素硫转化和微生物群落的影响
影响因子：
2.8
作者：
Xu Jinlan;Fan Yimin;Li Zhixu
通讯作者：
Li Zhixu
影响因子：
7.4
作者：
T. Hlinčík;P. Buryan
通讯作者：
T. Hlinčík;P. Buryan