Boiler/Kiln ->Dust Remover ->Induced Draft Fan ->Absorption Tower ->Chimney The flue gas from the boiler or kiln enters the absorption tower under the action of the induced draft fan after being removed from the dust. The absorption tower is a countercurrent spray empty tower structure that integrates absorption and oxidation functions. The upper part is an absorption zone, and the lower part is an oxidation zone. The flue gas after dust removal is in reverse contact with the circulating slurry in the absorption tower.
The system is generally equipped with 3-5 slurry circulating pumps, each of which corresponds to a layer of atomization spray layer. When only one unit is operating or the load is low, 1-2 layers of spray layers can be shut down, while the system still maintains a high liquid gas ratio to achieve the desired desulfurization effect. A two-stage mist eliminator is installed at the upper part of the absorption zone, and the free water content in the flue gas at the outlet of the mist eliminator does not exceed 75mg/Nm3\
吸收SO2后的浆液进入循环氧化区，在循环氧化区中，亚硫酸钙被鼓入的空气氧化成石膏晶体。同时，由吸收剂制备系统向吸收氧化系统供给新鲜的石灰石浆液，用于补充被消耗掉的石灰石，使吸收浆液保持一定的pH值。反应生成物浆液达到一定密度时排至脱硫副产品系统，经过脱水形成石膏。
The slurry after absorbing SO2 enters the circulating oxidation zone, where calcium sulfite is oxidized into gypsum crystals by the blown air. At the same time, the absorbent preparation system supplies fresh limestone slurry to the absorption oxidation system to supplement consumed limestone and maintain a certain pH value of the absorption slurry. When the reaction product slurry reaches a certain density, it is discharged to the desulfurization by-product system and dehydrated to form gypsum.
5.工艺特点
5. Process characteristics
1、脱硫效率高，可保证95%以上；
1. High desulfurization efficiency, ensuring over 95%;
2、应用为广泛、技术成熟、运行可靠性好；
2. The most widely used, mature technology, and good operational reliability;
3、对煤种变化、负荷变化的适应性强，适用于高硫煤；
3. Strong adaptability to coal type and load changes, suitable for high sulfur coal;
4、脱硫剂资源丰富，价格便宜；
4. Rich in desulfurizer resources and cheap in price;
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2023-03-27
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