The desulfurization methods: wet desulphurization and dry process desulphurization knowledge is introduced

by:J&T     2020-06-25
Desulfurization is no stranger in the industrial production, fluorine plastic and stainless steel pump is common desulphurization water pump, what methods for desulfurization, wet process and dry process desulphurization is one of the two big main desulfurization method, the difference between them is mainly realized through the following aspects: a, wet flue gas desulfurization, wet flue gas desulfurization is refers to the application of liquid absorbent ( Such as water or alkaline solution, etc. ) Cleaning flue gas removal of SO2 in flue gas. It has the advantage of high desulfurization efficiency, small equipment, low investment, easy operation, easy to control and cover an area of an area small; And defect is easy to cause the secondary pollution, waste water processing problems, high energy consumption, especially after washing of flue gas temperature is low, not conducive to the spread of the chimney exhaust, easy generation & other; White smoke & throughout; , need a second heating, severe corrosion, etc. The main methods are: limestone - Gypsum method, the process is the use of limestone/limestone slurry washing flue gas, reaction with SO2, generate calcium sulfite ( CaSO3) , after the separation of calcium sulfite can be abandoned, also can pass into the air forced oxidation and adding some additives, in the form of plaster for recycling. In order to reduce SO2 load of washing equipment, first to flue gas dust removal, and then into the dust removal equipment and absorption liquid to react. Lime/limestone - Absorbent plaster technique is mature, cheap, reliable operation, wide application, the desulfurization efficiency can reach above 90%. Ammonia method this method is to use ammonia absorbent to absorb the SO2 in flue gas, of which the product ammonium sulfite and bisulfite ammonium, using different methods dealing with intermediate recycled ammonium sulfate, gypsum, monomer sulfur and other by-products. Ammonium phosphate compound fertilizers method this method is the use of natural rock phosphate and ammonia as raw materials, in the process of flue gas desulfurization by-product for ammonium phosphate compound fertilizer, the technological process mainly includes four processes, i. e. , the system of activated carbon desulfurization and dilute sulphuric acid; Dilute sulphuric acid extraction phosphate rock with dilute sulphuric acid solution; Phosphoric acid and ammonia neutralization liquid [ ( NH4) 2HPO4] The secondary desulfurization; Dry slurry concentrated ammonium phosphate compound fertilizers. The desulfurization efficiency of more than 95%. Method this method is to use sodium hydroxide, sodium carbonate, sodium and sodium sulfite solution as the absorbent absorption of SO2 in flue gas, because of the law on SO2 absorption speed, the advantages of pipeline and equipment is not easy to jam, more extensive, so the application can absorb liquid after harmless treatment to refuse to or after appropriate treatments for by-product NaSO3 crystals, gypsum, sulfuric acid, etc. Is using the absorption performance is good and easy regeneration MgxMnOy absorbent to absorb the SO2 in flue gas, the method of the by-products - H2SO4 concentration can reach 98%. Kay Mick method is also called the magnesium oxide method, using two tandem venturi dust remover to remove tiny dust particles in flue gas, and MgO style solution to absorb the SO2 in flue gas. Generated in the process of absorbing MgSO4 & middot; 7 h2o and MgSO4 & middot; 6 h2o crystals with coke under 1000 ℃ heat decomposition with SO2 and MgO style. Regeneration of MgO style can be used as absorbent. Through the above analysis, we know the main advantages of wet desulphurization is the operation cost is low, high efficiency, but more water. Dry desulfurization optimization is not consumed water resources, but the desulfurization efficiency is not very ideal. According to the specific situation to master the use which kinds of desulfurization methods. Second, dry flue gas desulfurization dry flue gas desulfurization is refers to the application of powder or granular absorbent, adsorbent and catalyst to removing the SO2 in flue gas. It has the advantage of simple process, no sewage and sludge acid treatment, low energy consumption, especially after purification of flue gas temperature is higher, is advantageous to the chimney exhaust diffusion, won't produce & other; White smoke & throughout; Phenomenon, do not need secondary heating after purification of the flue gas, corrosion resistance; Its disadvantage is that the desulfurization efficiency is low, large equipment, large investment, covers an area of large, high operating technical requirements. Main methods are: the sorbent injection method according to different sorbent used in divided into calcium and sodium based process, sorbent can dry, wet state or grout, injection parts for furnace, economizer and flue. Calcium sulfur ratio of 2, the dry process desulphurization efficiency up to 50% ~ 70%, calcium utilization rate of 50%, this method is more suitable for old plant transformation, because do not need to add any smoke extraction process in power plant desulfurization equipment can to achieve. Contact oxidation method this method as well as industrial acid method, is based on silica as the carrier, with vanadium pentoxide or potassium sulfate as catalyst, the SO2 oxidation into SO3. SO3 and sulfuric acid or 'formed by the water vapor and ammonia generation ( NH4) 2SO4。 This method is of high temperature, operation cost is high, but the technology is relatively mature, the high concentration of flue gas at home and abroad of governance use it more. Electron beam irradiation method, this technique is simple, it is the use of high-energy electron beam photochemical reaction, using ammonia as absorbent. Decomposition of flue gas by irradiation reactor, after irradiation, produced a large number of hydroxyl and oxygen, sulfur dioxide and nitrogen oxide in flue gas to form sulfuric acid and nitric acid, then with the additives of ammonia reaction mixture of ammonium sulfate, ammonium nitrate and so on, as agricultural fertilizer.
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