Process flow of DDS biological desulfurization technology

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There are two process flows for the DDS biological desulfurization technology: one is the jet self-priming air regeneration process, and the other is the high tower regeneration process. The process is described as follows: a. Jet self-priming air regeneration process. Description of the jet self-priming air regeneration process: Gas flow: Gas containing hydrogen sulfide and/or organic sulfur enters the desulfurization tower from its bottom ； In the desulfurization tower, the gas comes into uniform counter-current contact with the desulfurization lean liquid that is sprayed from the top, and the hydrogen sulfide and/or organic sulfur in the gas are absorbed by this lean liquid ； The desulfurization lean liquid, which has absorbed hydrogen sulfide and/or organic sulfur, is converted into a desulfurization rich liquid and flows out from the bottom of the desulfurization tower ； The gas free of hydrogen sulfide and/or organic sulfur flows out from the top of the desulfurization tower to be used as industrial feed gas. Liquid flow: The desulfurization-rich liquid flowing out from the bottom of the desulfurization tower is pressurized by a desulfurization-rich liquid pump, then enters an injector where it mixes with the air injected therein; subsequently, it passes through an injection tail pipe to enter the injection regeneration tower from the bottom ； In the spray regeneration tower, the sulfides present in the desulfurization-rich liquid are converted into elemental sulfur foam under the combined action of DDS-Fe and sulfur-loving, oxygen-consuming, heat-resistant, and alkali-resistant bacteria, and this foam flows out through the foam overflow port of the spray regeneration tower ； After regeneration, the desulfurization rich liquid is converted into desulfurization lean liquid, which flows out from the outlet of the desulfurization lean liquid in the spray regeneration tower and enters the desulfurization lean liquid tank. From there, it is pumped back into the desulfurization tower from the top of the tower by a desulfurization lean liquid pump, thus repeating the process for full cyclic use ； The DDS catalyst series is added to the catalyst preparation tank, followed by the addition of desulfurization lean liquid; after mixing well, it is pumped into the desulfurization lean liquid tank using a catalyst feeding pump. Sulfur foam process: The sulfur foam flows out of the foam overflow port of the spray regeneration tower and enters the sulfur foam tank; it is then pumped by a foam pump to the sulfur foam filter for filtration. The filtrate goes into the filtrate tank, and from there it is pumped by a filtrate pump to the desulfurization lean liquid tank for reuse ； The filter residue is sulfur paste, which is recovered and used to refine into sulfur or to produce sulfuric acid. b. High tower regeneration process: Description of the high tower regeneration process: Gas flow: Gas containing hydrogen sulfide and/or organic sulfur enters the desulfurization tower from its bottom ； In the desulfurization tower, the gas comes into uniform counter-current contact with the desulfurization lean liquid that is sprayed from the top, and the hydrogen sulfide and/or organic sulfur in the gas are absorbed by this lean liquid ； The desulfurization lean liquid, which has absorbed hydrogen sulfide and/or organic sulfur, is converted into a desulfurization rich liquid and flows out from the bottom of the desulfurization tower ； The gas free of hydrogen sulfide and/or organic sulfur flows out from the top of the desulfurization tower and is used as an industrial feed gas. Liquid flow: The desulfurization-rich liquid flowing out from the bottom of the desulfurization tower enters the desulfurization liquid buffer tank, and is then pumped by a desulfurization pump from the bottom of the regeneration tower into the regeneration tower ； At the same time, compressed air is also blown in from the bottom of the regeneration tower. Within this tower, the sulfides present in the desulfurization-rich liquid are converted into elemental sulfur foam under the combined action of DDS-Fe and sulfur-loving, oxygen-consuming, heat-resistant, and alkali-resistant bacteria; this foam then flows out through the foam overflow port of the regeneration tower ； After regeneration, the desulfurization-rich liquid is converted into desulfurization-poor liquid, which flows out from the outlet of the desulfurization-poor liquid in the regeneration tower, enters the level-regulating buffer, and then returns into the desulfurization tower from its top, repeating this process for full cyclic use ； The DDS catalyst series is added to the catalyst preparation tank, followed by the addition of desulfurization lean liquid; after mixing thoroughly, it is pumped in via a catalyst addition pump into the level-regulating buffer to mix with the desulfurization lean liquid. Sulfur foam process: The sulfur foam flows out of the foam overflow port of the regeneration tower and enters the sulfur foam tank; it is then pumped by a foam pump to a sulfur foam filter for filtration. The filtrate goes into the mother liquor tank, and from there it is pumped by a mother liquor pump into the desulfurization solution buffer tank for reuse ； The filter residue is sulfur paste, which is recovered and used to refine into sulfur or to produce sulfuric acid.