燃煤电厂高含盐废水近零排放研究
发布时间：2019-05-16 11:00
【摘要】：随着环保要求的不断提高,燃煤电厂面临着废水难以达标排放的压力,因此必须寻求新的途径解决电厂的实际问题。目前适用于燃煤电厂高含盐废水处理的技术除常规的三联箱工艺外,还有两级澄清软化工艺、膜处理技术、热法处理技术等工艺。本论文主要针对燃煤电厂高含盐废水水质特点,优先考察了湿式捞渣机系统利用的可行性和适用性,然后研究了高压反渗透技术、正渗透技术在处理脱硫废水方面技术的适用性及经济的可行性。为了降低费用,国内部分电厂利用湿式捞渣机来消耗脱硫废水,本论文对该方案的可行性进行了论证,并针对现场试验过程中发现的问题提出了应对措施。为了考察脱硫废水引入捞渣机后对锅炉本体的影响,搭建实验室模拟平台进行了相应的试验验证,分析了脱硫废水引入渣系统的蒸汽成份对燃烧系统的影响行为。结果表明采用湿除渣系统的电厂在严格控制水量的前提下可以有效利用湿式捞渣机来消耗高含盐废水,从而减轻后续处理的压力。正渗透技术在国外的垃圾渗滤液处理方面已得到了很好的应用,在处理燃煤电厂高含盐废水方面实际应用案例较少,目前在国内已有正渗透技术处理脱硫废水的案例,但由于运行时间较短,对该技术的工程应用情况还需要深入的研究。研究结果表明当正渗透系统进水含盐量(TDS)在41000mg/L左右时,一级两段MBC系统浓缩倍数约为4-4.5,浓水经汽提后含盐量在180000-200000mg/l之间,同时,试验运行期间正渗透膜组件没有发现污堵和结垢迹象。反渗透技术在水处理领域也有多年的成果应用案例,凭借其宽流道结构及能有效减缓物理堵塞等独特性能,在处理燃煤电厂高含盐废水方面也呈现潜在优势。实验结果高压反渗透组件可以选择75bar、150bar和200bar三个等级的操作压力,在浓缩倍数高的应用中,其含固量可以达到30%以上。结合正渗透和反渗透的优势,提出两者有机结合降低系统能耗提高膜技术在处理燃煤电厂高含盐废水领域的技术方案。
[Abstract]:With the continuous improvement of environmental protection requirements, coal-fired power plants are facing the pressure that it is difficult to meet the discharge of wastewater, so we must find new ways to solve the practical problems of power plants. At present, the technologies suitable for the treatment of high salt wastewater in coal-fired power plants are not only the conventional triple-box process, but also the two-stage clarification and softening process, membrane treatment technology, thermal treatment technology and so on. In this paper, according to the water quality characteristics of high salt wastewater in coal-fired power plant, the feasibility and applicability of wet slag fishing machine system are investigated, and then the high pressure reverse osmosis technology is studied. The applicability and economic feasibility of positive osmosis technology in desulphurization wastewater treatment. In order to reduce the cost, some domestic power plants use wet slag fishing machine to consume desulphurization wastewater. The feasibility of this scheme is demonstrated in this paper, and the countermeasures are put forward in view of the problems found in the field test. In order to investigate the influence of desulphurization wastewater on boiler body after desulphurization wastewater was introduced into slag fishing machine, the corresponding experimental verification was carried out on the laboratory simulation platform, and the influence behavior of steam composition of desulphurization wastewater slag introduction system on combustion system was analyzed. The results show that the power plant with wet slag removal system can effectively use wet slag fishing machine to consume high salt wastewater under the premise of strict control of water quantity, so as to reduce the pressure of subsequent treatment. Positive osmosis technology has been well applied in the treatment of landfill leachate in foreign countries, and there are few practical application cases in the treatment of high salt wastewater from coal-fired power plants. At present, there are cases of desulphurization wastewater treatment by positive osmosis technology in China. However, due to the short running time, the engineering application of this technology still needs to be deeply studied. The results show that when the influent salt content (TDS) of the positive osmotic system is about 41000mg/L, the concentration multiple of the first stage two-stage MBC system is about 4 鈮，
本文编号：2478239
[Abstract]:With the continuous improvement of environmental protection requirements, coal-fired power plants are facing the pressure that it is difficult to meet the discharge of wastewater, so we must find new ways to solve the practical problems of power plants. At present, the technologies suitable for the treatment of high salt wastewater in coal-fired power plants are not only the conventional triple-box process, but also the two-stage clarification and softening process, membrane treatment technology, thermal treatment technology and so on. In this paper, according to the water quality characteristics of high salt wastewater in coal-fired power plant, the feasibility and applicability of wet slag fishing machine system are investigated, and then the high pressure reverse osmosis technology is studied. The applicability and economic feasibility of positive osmosis technology in desulphurization wastewater treatment. In order to reduce the cost, some domestic power plants use wet slag fishing machine to consume desulphurization wastewater. The feasibility of this scheme is demonstrated in this paper, and the countermeasures are put forward in view of the problems found in the field test. In order to investigate the influence of desulphurization wastewater on boiler body after desulphurization wastewater was introduced into slag fishing machine, the corresponding experimental verification was carried out on the laboratory simulation platform, and the influence behavior of steam composition of desulphurization wastewater slag introduction system on combustion system was analyzed. The results show that the power plant with wet slag removal system can effectively use wet slag fishing machine to consume high salt wastewater under the premise of strict control of water quantity, so as to reduce the pressure of subsequent treatment. Positive osmosis technology has been well applied in the treatment of landfill leachate in foreign countries, and there are few practical application cases in the treatment of high salt wastewater from coal-fired power plants. At present, there are cases of desulphurization wastewater treatment by positive osmosis technology in China. However, due to the short running time, the engineering application of this technology still needs to be deeply studied. The results show that when the influent salt content (TDS) of the positive osmotic system is about 41000mg/L, the concentration multiple of the first stage two-stage MBC system is about 4 鈮，
本文编号：2478239
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