FGD flue gas desulfurization slurry circulating pump technology and the method

FGD flue gas desulfurization is industry and efficient desulfurization methods for large-scale application, the system can mainly from coal-fired flue gas so2 in accordance with the sulfide absorber and the modality of the by-product, the slurry circulating water pump will absorb tower constantly slurry circulation, make the sulfur dioxide in flue gas is absorbed completely.

FGD flue gas desulfurization technology can be divided into three types of dry, half dry method and wet method. Dry desulfurization technology solid sorbent was mainly used to remove the SO2 in flue gas, generally the limestone powder is sprayed into the furnace, the thermal decomposition into CaO, absorb the SO2 in flue gas, generated CaSO3, with fly ash in dust collection or through the chimneys. Wet flue gas desulfurization is a liquid absorbent in ion under the condition of gas liquid reaction, and then remove the SO2 in flue gas, system equipment used is simple, stable and reliable running, high desulfurization efficiency. The biggest advantage of dry process desulphurization is no waste water, waste acid in the treatment of the discharge, reduce the secondary pollution; Defect is the desulfurization efficiency is low, large equipment. Wet desulphurization using liquid absorbent washing to remove SO2 flue gas, the equipment is simple, easy to operate, high desulfurization efficiency; But after desulfurization of flue gas temperature is low, the equipment corrosion is relatively dry.

limestone ( Lime) - Gypsum

limestone wet flue gas desulfurization technology ( Lime) Wet desulfurization technology with absorbent cheap, widely used in the field of wet FGD. The limestone as the absorber reaction mechanism as: SO2 absorption: ( g） → SO2（ L） +H2O → H++HSO3- → H+ +SO32- Solubility: CaCO3 ( s） + H +→Ca2 + + HCO3 - Neutral: HCO3 - + H +→二氧化碳( g） + H2O oxidation: HSO3 - + 1/2O2→SO32 - +H+       SO32- + 1/2O2→SO42 - Crystal: Ca2 + + SO42 - +1/2H2O →CaSO4·1/2H2O（ s） This process is characterized by high desulfurization efficiency ( > 95%) , high utilization rate of absorbent ( > 90%) , can adapt to the high concentration of SO2 flue gas condition, low calcium sulfur ratio ( Generally 92%, operation and maintenance cost is low. The flue gas after dust, by the blower fan into gas Air heat exchanger and cooling, and then into the absorption tower. Within the desulfurization absorption tower, contact with large amounts of water from the circulating cooling system, flue gas sulfur dioxide is absorbed in removal, water discharged after oxidation. After removal of sulfur dioxide of the flue gas by heat exchanger to heat up, by flue emissions.

seawater flue gas desulfurization technology subject to regional restriction, applies only to have rich water resources engineering, especially for seawater circulating cooling water of power plant, but need to properly solve internal absorption tower, absorption tower drainage pipeline and its rear flue and chimney, aeration tank and aeration device corrosion problems.

spray spray drying process of drying process ( SDA) Is a kind of semi dry FGD technology, its market share is second only to wet. The law is the absorber slurry Ca ( 哦) 2 within the reaction tower spray droplets in the absorption of SO2 in flue gas by thermal evaporation flue gas at the same time, the solid and the capture by the filter. When calcium sulfur ratio is 1. 3 to 1. 6, the desulfurization efficiency can reach 80% ~ 90%. Semi dry FGD technology and general characteristics of dry method and wet method. Its main drawback is the use of lime milk elimination as absorbent, system easy to scale and plugging, and need special equipment for the preparation of absorbent, so investment cost is larger; Desulfurization efficiency and the utilization rate of absorbent and the limestone/gypsum method is high.

spray drying technique in the burning low sulfur and sulfur in coal is used in medium and small capacity of the unit with more. Domestic in January 1990 in baima power plant built a medium-sized test device. But many units also USES the desulfurization process, the technology has been basically mature.

electron beam flue gas desulfurization technology ( The EBA method)

electron beam radiation technology desulfurization process is a dry process desulphurization technology, is a physical method and chemical method with the combination of new and high technology. The process of cooling process is made up of smoke dust, flue gas, ammonia into, electron beam irradiation and by-products of capture process. Boiler flue gas discharge, after dust collector of the coarse filter processing into the cooling tower, spray cooling water in cooling towers, flue gas cooling to suitable for desulfurization and denitration process temperature ( About 70 ℃) 。 The dew point of flue gas is usually about 50 ℃. Through the smoke flow in the reactor cooling tower after, injected close to stoichiometric ratio of ammonia, compressed air and soft water injection, to join the amount depends on the SOx and NOx concentrations of ammonia, after electron beam irradiation, SOx and NOx in the middle of the free radicals generated under the action of sulfuric acid and nitric acid. And sulfuric acid and nitric acid with the coexistence of ammonia neutralization reaction, producing powder particles to a mix of ammonium sulfate and ammonium nitrate. Desulfurization rate can reach more than 90%, denitration rate can reach more than 80%. In addition, still can use sodium, magnesium and ammonia as absorbent, general reaction of the ammonium sulfate and ammonium nitrate particles were generated by deputy product separation and capture dust collector, after purification of flue gas booster emissions into the atmosphere.

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