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后的漿液進入循環(huán)氧化區(qū)，在循環(huán)氧化區(qū)中，亞硫酸鈣被鼓入的空氣氧化成石膏晶體。同時，由吸收劑制備系統(tǒng)向吸收氧化系統(tǒng)供給新鮮的石灰石漿液，用于補充被消耗掉的石灰石，使吸收漿液保持一定的pH值。反應生成物漿液達到一定密度時排至脫硫副產品系統(tǒng)，經過脫水形成石膏。
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.工藝特點
5. Process characteristics
1、脫硫效率高，可保證95%以上；
1. High desulfurization efficiency, ensuring over 95%;
2、應用為廣泛、技術成熟、運行可靠性好；
2. The most widely used, mature technology, and good operational reliability;
3、對煤種變化、負荷變化的適應性強，適用于高硫煤；
3. Strong adaptability to coal type and load changes, suitable for high sulfur coal;
4、脫硫劑資源豐富，價格便宜；
4. Rich in desulfurizer resources and cheap in price;
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2023-03-27
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