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FGD System

XIRI Light Energy Limited Corporation
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XIRI SDS-DRY DESULFURZATION TECHNOLOGY INTRODUCTION Dry gas desulfurization, also know as dry flue gas desulfurization, refers to the use of powdery granular absorbent, adsorbent or catalyst to remove sulfide gas in the flue gas.  Dry desulfurization is to use the reducibility and flammability of SO2, USE solid oxidant or adsorbent to desulfurate or directly make it burn. Dry desulfurization is a method to generate Na2SO4 by a reaction of NaHCO3 and SO2, which is called dry desulfurization.  
XIRI Light Energy Limited Corporation
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XIRI SDS-DRY DESULFURZATION WORKING PRINCIPLE The flue gas (230℃) taken from the flue enters the SDS desulfurization and dust removal system. The flue gas first enters the SDS reactor, and then the ultra-fine sodium bicarbonate powder is injected into the SDS reactor. Under the action of high-temperature flue gas, the ultra-fine sodium bicarbonate powder decomposes the highly active sodium carbonate and carbon dioxide. The highly active Na2CO3 fully contacts with SO2 and other acidic media in the flue gas to produce a chemical reaction and absorbed and purified. Main reactions 2NaHCO3(S) = Na2CO3(S) + H2O(g) + CO2(g)     (1) 2SO2(g) + 2NaCO3(s) + O2 = 2Na2SO4(s) +2CO2(g)     (2) Side             effects : SO3(g) + Na2CO3(s) = Na2SO4(s) +CO2(g)     (3) 2HCL(g) + Na2CO3(s) = 2NaCL(s) + CO2(g)     (4) SO2 + Ca(OH)2 = CaSO3 + H2O     (5)  
XIRI Light Energy Limited Corporation
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XIRI CFB-SEMI-DRY DESULFURZATION TECHNOLOGY INTRODUCTION Semi-dry technology is a simple, low investment, high-performance desulfurization process, which refers to the use of water and desulfurizer in a sensible semi-wet state of desulfurizer slurry and flue gas to fully mix and react to achieve the desulfurization effect. During the drying process, the sulfur dioxide in the flue gas after reacts with sulfur dioxide to form a dry powder product. To improve desulfurization efficiency, lime powder digestion pulping is usually used as a desulfurization agent. Desulfurization slag is a free-flowing dry powder mixture without secondary pollution and can be further comprehensively utilized. This method is mainly applied to the flue gas desulfurization of power station boilers. The flue gas processing capacity of a single tower can be applied to boilers whose evaporation capacity is between 75t/h and 1025t/h, and the removal rate of sulfur dioxide can reach more than 99%. This method has the largest single tower processing capacity and the most superior comprehensive desulfurization benefits in dry and semi-dry desulfurization technologies.
XIRI Light Energy Limited Corporation
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XIRI CFB-SEMI-DRY DESULFURZATION WORKING PRINCIPLE Flue gas from boiler air preheater by desulfurization tower bottom through ventilation device into the desulfurization tower, and then the flue gas by the acceleration of the bottom of the venturi tube for desulphurization into the circulating fluidized bed body, material in circulating fluidized bed, the gas-solid two-phase due to the effect of airflow, produce intense turbulent and mixing, full contact, in the process of rising, constantly forming poly group back down, and gathered group content and dissolution continually in the intense turbulent gas life, the gas-solid slip velocity between the slip up to single-particle velocity of dozens of times, pushing the bed up within the Ca/S ratio is as high as more than 87%. During the reaction process, the temperature of the flue gas is adjusted to about 70℃ by the atomized water injected. Qualified absorbent ( qualified fineness Ca(OH)2 ) dry powder is pneumatically transported into the absorption tower by the jet pump to conduct desulfurization chemical reaction with the flue gas in the tower. After the reaction, a large amount of gas-solid mixture is discharged from the top of the absorption tower. The gas-solid two-phase flow mechanism in the circulating fluidized bed greatly enhances the mass transfer and heat transfer between gas and solid and provides a fundamental guarantee for the realization of high desulfurization rate. The cleaned dust and smoke is discharged laterally from the top of the desulfurization tower, and then into the efficient dust collector, and then discharged into the chimney through the boiler fan. The solid particles collected by the dust client pass through the recirculation system under the dust collector, return to the desulfurization tower and continue to participate in the reaction, and so on.
XIRI Light Energy Limited Corporation
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XIRI WET DESULFURZATION TECHNOLOGY INTRODUCTION Limestone/gypsum desulphurization process is a kind of desulphurization process, which uses limestone, or dolomite as the desulphurization absorbent to remove SO2 from the exhaust gas, among which limestone is the most widely used and one of the earliest absorbents for flue gas desulphurization. It is the most widely used standard desulfurization technology with the most mature technology in the word. It uses cheap and easy to obtain limestone or lime as desulfurization absorbent, limestone is crushed and ground into powder, mixed with water and stirred into absorption slurry. When lime is used as absorbent, lime powder is digested and then added with water to make an absorbent slurry. In the absorption tower, the absorption slurry is mixed with the flue gas inContact, the sulfur dioxide in the flue gas is removed by chemical reaction with the calcium carbonate in the slurry and the injected oxidized air, and the final reaction product is gypsum. After desulfurization, the flue gas is removed by the defoamer, and then heated by the heat exchanger and sent back to the chimney. The desulphurized gypsum slurry is recovered after dehydration by the dehydration device. Due to the recycling of absorption slurry, the utilization rate of desulfurization absorber is very high. Limestone materials are widely available, raw materials are readily available, and prices are low, so the lime/gypsum method is by far the least expensive of the desulphurization methods.  
XIRI Light Energy Limited Corporation
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XIRI WET DESULFURZATION WORKING PRINCIPLE The slurry made of limestone powder and water was pumped into the absorption tower as absorbent and mixed with the sulfur-dioxide of the flue gas. the calcium carbonate in the slurry and the air pumped in from the lower part of the tower was oxidized to produce the calcium sulfate, which reached a certain saturation and crystallized to form dihydrate gypsum. The gypsum slurry discharged by the absorption tower is concentrated and dehydrated so that its water content is less than 10%. Then the slurry is sent to the gypsum storage warehouse by the conveyor. The flue gas after desulfurization is removed by the mist eliminator. Because the absorber slurry in the absorber tower circulates repeatedly with the flue gas through the circulating pump, the absorbent utilization rate is very high, the calcium sulfur is relatively low, the desulfurization efficiency can be than 99%.     
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