In the desulfurization tower, the hydrogen sulfide and sodium hydroxide in the biogas are neutralized, and the reaction product is sodium hydrogen sulfide and water to remove the hydrogen sulfide in the biogas; Then, sodium hydrosulfide is reduced to sodium hydroxide and elemental sulfur by using the role of biological bacteria.
步：脫硫反應塔內的化學方程式：
Step 1: Chemical equation in desulfurization reaction tower:
The biogas converts H2S in the biogas from the gas phase to the liquid phase through the desulfurization reaction tower, which is a scrubber. The biogas enters from the bottom of the tower and passes through the filter bed. The circulating water enters from the top of the tower, disperses through the special nozzle, and the free falling body passes through the filter bed. The special filter material can further disperse the biogas and the circulating water, extend the contact time, and improve the washing effect. Circulating water containing sulfide flows into regeneration tank from the bottom of desulfurization reaction tower.
The regeneration tank completes the process of sulfide oxidation in the circulating water. The regeneration tank creates a living environment for desulfurization bacteria in the circulating water. The heating coil in the regeneration tank provides heat for the circulating water to ensure that the temperature of the circulating water is between 30-33 degrees. The aerator provides oxygen to the circulating water to ensure proper dissolved oxygen in the circulating water.
工藝流程示意圖：
Process flow diagram:
工藝特點：
Process characteristics:
①脫硫過程中除向再生池通入少量空氣外和少量堿液，不需再額外添加催化劑和氧化劑；
① In addition to a small amount of air and a small amount of lye into the regeneration tank during the desulfurization process, no additional catalyst and oxidant need to be added;
②不需處理化學污泥；
② No need to treat chemical sludge;
③產生很少生物污染，低能耗，效率高且穩定，無臭味；
③ It produces little biological pollution, low energy consumption, high efficiency and stability, and no odor;
④技術含量高，但易控制，只需要對操作人員進行一周培訓（高中文化）。
④ High technical content, but easy to control, only one week of professional training (high school culture) is required for operators.
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2023-02-13
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