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| Experimental study on application of desulfurization synergist and nano-calcium hydroxide in desulfurization system of coal-fired power plant |
| Hao Siyuan1, Yu Shu3, Huang Jun2, Fan Peng2, Luo Sheng2, Yu Zheng2 |
| 1. Yisa (Guangzhou) Intelligent Technology Corporation Ltd., Guangzhou 510000, China; 2. Guangzhou Zhujiang Power Corporation Ltd., Guangzhou 511457, China; 3. Central South University, Changsha 410083, China |
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Abstract The design of flue gas desulfurization process in coal-fired power plants was influenced by the characteristics of the coal, the site, and the sulfur content of the coal. Due to the fluctuations in the electricity coal market, it is particularly important to optimize the coal structure, reduce operating costs, and ensure that environmental indicators do not deteriorate due to frequent unit starts and stops. In order to improve the adaptability of the desulfurization system to coal types, ensure the stability of the operation status of the desulfurization facilities, and meet the emission standards of pollutants, a certain power plant actively seeks new ideas for energy conservation and consumption reduction. It conducts comparative experiments on adding desulfurization enhancers and nano calcium hydroxide in the absorption tower. Through on-site tests of adding different desulfurization additives under different working conditions, it aims to accelerate the reaction rate between limestone slurry and sulfur in the absorption tower, thereby improving desulfurization efficiency and optimizing the operation of the slurry circulation system. The research results showed that by continuously adding 3 000 kg of desulfurization enhancer for 20 days, the average concentration of SO2 in the original flue gas was 1 323.95 mg/m3, and the desulfurization efficiency reached 98.56%~ 99.02%, an increase of 0.2%~ 0.6% compared to before addition; By continuously adding 2 582 kg of nano calcium hydroxide for one week, the average concentration of SO2 in the original flue gas was 1 991 mg/m3, and the desulfurization rate could reach 98.7%, an increase of 0.5% compared to before addition. Whether adding desulfurization enhancers or nano calcium hydroxide, both increase the activity of the absorption tower slurry and improve the desulfurization efficiency of the system; In terms of not increasing investment costs, synergists are superior to nano calcium hydroxide, and the latter performs better than the former when burning high sulfur coal in the system.
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