With the increasingly strict requirements on energy saving and environmental protection, the economical, efficient and environment friendly operation of large coal‐fired units are being more and more critical. In light of the technical problems of massive energy consumption and high cost in the operation of the wet desulfurization system in a 1,000 MW ultra‐supercritical boiler, the effects of slurry circulation pump combination, slurry pH and absorption tower liquid level on desulfurization efficiency under different unit loads were tested, and the total operating costs were calculated. The results showed that the power consumption under different conditions could be greatly reduced by changing the combination of slurry circulation pumps. The power cost increases from 1,059.42 to 1,146.99 yuan/hr as the combination of slurry circulation pump changes from AC pump combination to BD pump combination under 1,000 MW, increased by 7.63%. Considering all factors, the combination of BC circulating pump can effectively reduce the power consumption cost and achieve the optimal economical operation under the load of 1,000 and 750 MW. The desulfurization efficiency is in direct proportion to the increase of slurry pH. The optimal pH of slurry under 1,000 MW is in the range of 5.50–5.60, 4.80–4.90 under 750 MW, and 4.50–4.60 under 500 MW. Besides, the absorption tower liquid level has a significant impact on the energy consumption of desulfurization system. With the decrease of the absorption tower liquid level, the power consumption cost of desulfurization system shows a downward trend. To avoid the frequent adjustment of liquid level which may result in safety accidents, the optimal liquid level of absorption tower is maintained at 8.00–9.00 m under different unit loads. The research results can provide significant guidance for the operation optimization and fine management of the desulfurization system of the same type.

中文翻译：

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超超临界燃煤电厂湿法脱硫系统的运行优化和成本分析

随着对节能环保的日益严格的要求，大型燃煤机组的经济，高效和环境友好运行变得越来越重要。针对一台1000 MW超超临界锅炉湿法脱硫系统运行中能耗大，成本高的技术​​问题，在不同条件下，浆液循环泵组合，浆液pH值和吸收塔液位对脱硫效率的影响。测试了单位负载，并计算了总运营成本。结果表明，通过改变浆料循环泵的组合，可以大大降低不同条件下的能耗。电力成本从1,059.42增加到1,146。渣浆循环泵组合由1000兆瓦以下的交流泵组合改为蓝浆泵组合，每小时增加99元/小时，增长7.63％。综合考虑所有因素，BC循环泵的组合可以有效降低功率消耗成本，并在1,000和750 MW的负载下实现最佳的经济运行。脱硫效率与浆料pH的增加成正比。在1,000 MW以下，浆料的最佳pH值在5.50–5.60之间，在750 MW以下为4.80–4.90，在500 MW以下为4.50–4.60。此外，吸收塔液位对脱硫系统的能耗有重要影响。随着吸收塔液位的降低，脱硫系统的能耗成本呈下降趋势。为避免频繁调整液位可能导致安全事故，在不同单位负载下，吸收塔的最佳液位应保持在8.00–9.00 m。研究结果可为同类型脱硫系统的运行优化和精细管理提供重要指导。