3×20t/h+1×10t/h Boiler Flue Gas Desulfurization Solution

In view of the current coal fired boiler sulfur dioxide produced causeincreasingly serious air pollution, in national policy intervention, the relevantfactories began to desulfurization equipment installation or renovation. Flue gasdesulfurization process is the important part of process industry, belonging toenvironmental and energy field, because our country economy development level,atmospheric pollution at present is still in the treatment after pollution status.Xi’an Municipal Environmental Protection Bureau" on further regulate our citymedium and small coal fired boiler flue gas desulfurization project constructionand management notice" is the government department of the sulfur dioxidepollution on environment policy intervention.Flue gas desulfurization by core processing technology mostly usedchemical reaction means, including absorption, adsorption, catalytic reaction.With the usual process, using chemical method to process objects, can besummarized into three parts:1. raw material pretreatment, including on theprocessed object processing, such as for coal-fired boiler flue gas dust, coolingand so on. To add a reactant, such as flue gas desulfurization of limestone milling;2.chemical reaction, such as limestone and SO₂reaction;3reaction products afterprocessing.This paper briefly introduces some methods of boiler flue gasdesulfurization, flue gas desulphurization technology in China the applicationpresent situation.Wet desulfurization is currently the most widely used methodof desulfurization desulfurization, accounted for more than90%of the total. Wetdesulfurization desulfurization absorbent materials according to different can bedivided again for limestone/lime method, ammonia, Na-Ca double alkalimethod, magnesium oxide method, in which the limestone/lime method,ammonia, Na-Ca double alkali method, magnesium oxide method to use more.,main problems existing in flue gas desulfurization technology. Combined withthe real examples of Shaanxi University of Science and Technology boiler, boiler flue gas desulfurization solution. Combined with the actual situation of theproject, from project investment, operating costs, two pollution, operation andmanagement of the difficult and many aspects considered, this design uses theNa-Ca double alkali method.Process for: From the boiler flue gas containing dust in15²2m/s flowrate through the import and flue gas into the cylinder, containing [OH^-] calledion alkaline water in different parts from the desulfurization tower by spiralnozzle, formation and flue gas into reverse multiple rows of high speed atomizedmist, smoke and sulfur oxides and water increasing the collision frequency, andmake full use of atomized droplet velocity caused by very high relative velocityof gas, to ensure that the dust removal and desulfurization effect. At the sametime gas increase the gas-liquid mass transfer surface area and turbulent turntable,improve the mass transfer rate, sulfur dioxide and alkali gas-liquid exchange,further improve the desulfurization effect. Desulfurization product with flow intothe desulfurizing tower bottom, from the overflow hole to drain away, in thebottom of the cylinder body and is provided with a seal cover to prevent leakageof flue gas from the bottom of Cao, with clearance hole for cylinder bottomcleaning.After the desulfurization waste water from the bottom of the overflow holeexcluded in the regeneration tank, through the mixer and a lime slurry fullcontact for regeneration, then flows into the sedimentation tank in sedimentationtank, solid-liquid separation, supernatant flow into the clarifier, plus sodiumalkali regeneration cycle. To sink to the bottom of the solid slurry into the plateand frame filter press is used for desulfurization. This not only solved theproblem of slag treatment, while reducing the amount of one-time investment,reduce operation cost. The purified gas, through the barrel upper extraction, so asto achieve the purpose of the dust removal and desulfurization, and finally intothe chimney into the atmosphere.