采用不同热源驱动多效蒸馏(MED)或多级闪蒸(MSF)系统,对燃煤电厂湿法脱硫工艺废水进行处理,有望实现废水的低成本零排放。针对"预处理-浓缩-蒸发脱盐"工艺中已经过预处理的脱硫废水,提出5种不同的集成方案以实现"浓缩-...采用不同热源驱动多效蒸馏(MED)或多级闪蒸(MSF)系统,对燃煤电厂湿法脱硫工艺废水进行处理,有望实现废水的低成本零排放。针对"预处理-浓缩-蒸发脱盐"工艺中已经过预处理的脱硫废水,提出5种不同的集成方案以实现"浓缩-深度脱盐"。分别建立了各方案的热经济性分析模型,定量研究了造水比和热成本的变化规律。结果表明:从热源角度分析,厂用汽热源成本较高,烟气成本低廉而泵功成为主要成本;从提浓与脱盐工艺角度,采用M E D-T V C (multi-effect distillation-thermal vapor compressor)方案可提高造水比10%~100%,降低热成本10%~50%,但是降膜蒸发结构的MED对废水盐浓度的波动比较敏感,且不适合处理高浓度废水,强制循环蒸发结构可改善该问题;MSF工艺对盐浓度具有更强的适应性,采用烟气供热的成本为0.3~1.2元/t。展开更多
The combustion process of pulverized coal injected into blast furnace involves a lot of physical and chemical reactions. Based on the combustion behaviors of pulverized coal, the conception of coal effective calorific...The combustion process of pulverized coal injected into blast furnace involves a lot of physical and chemical reactions. Based on the combustion behaviors of pulverized coal, the conception of coal effective calorific value representing the actual thermal energy provided for blast furnace was proposed. A cost performance evaluation model of coal injection was built up for the optimal selection of various kinds of coal based on effective calorific value. The model contains two indicators: coal effective calorific value which has eight sub-indicators and coal injection cost which includes four sub-indicators. In addition, the calculation principle and application of cost performance evaluation model in a Chinese large-scale iron and steel company were comprehensively introduced. The evaluation results finally confirm that this novel model is of great significance to the optimal selection of blast furnace pulverized coal.展开更多
文摘采用不同热源驱动多效蒸馏(MED)或多级闪蒸(MSF)系统,对燃煤电厂湿法脱硫工艺废水进行处理,有望实现废水的低成本零排放。针对"预处理-浓缩-蒸发脱盐"工艺中已经过预处理的脱硫废水,提出5种不同的集成方案以实现"浓缩-深度脱盐"。分别建立了各方案的热经济性分析模型,定量研究了造水比和热成本的变化规律。结果表明:从热源角度分析,厂用汽热源成本较高,烟气成本低廉而泵功成为主要成本;从提浓与脱盐工艺角度,采用M E D-T V C (multi-effect distillation-thermal vapor compressor)方案可提高造水比10%~100%,降低热成本10%~50%,但是降膜蒸发结构的MED对废水盐浓度的波动比较敏感,且不适合处理高浓度废水,强制循环蒸发结构可改善该问题;MSF工艺对盐浓度具有更强的适应性,采用烟气供热的成本为0.3~1.2元/t。
基金Project(51134008)supported by the National Natural Science Foundation of ChinaProject(2012CB720401)supported by the National Basic Research Program of China
文摘The combustion process of pulverized coal injected into blast furnace involves a lot of physical and chemical reactions. Based on the combustion behaviors of pulverized coal, the conception of coal effective calorific value representing the actual thermal energy provided for blast furnace was proposed. A cost performance evaluation model of coal injection was built up for the optimal selection of various kinds of coal based on effective calorific value. The model contains two indicators: coal effective calorific value which has eight sub-indicators and coal injection cost which includes four sub-indicators. In addition, the calculation principle and application of cost performance evaluation model in a Chinese large-scale iron and steel company were comprehensively introduced. The evaluation results finally confirm that this novel model is of great significance to the optimal selection of blast furnace pulverized coal.