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石灰石、石膏法脱硫
Simply put, desulfurization and denitrification are the process of neutralizing acid with alkali. Desulfurization is the removal of sulfur dioxide from boiler flue gas; Denitrification refers to the removal of nitrogen oxides from boiler flue gas; The process of desulfurization is to make alkaline desulfurizers (such as limestone, CaO, sodium hydroxide, etc.) into a slurry, mix it with boiler flue gas, sulfur dioxide reacts with water to form acid, and reacts with alkaline desulfurizers to produceCaSO4The process of denitrification of desulfurization end products such as calcium sulfate is similar to the principle of desulfurization, which is to replace the denitrification agent with ammonia water or urea.
Basic Principles
The flue gas from the boiler induced draft fan undergoes heat exchange and cooling, and the cooled flue gas enters the lower part of the absorption tower. The absorbent limestone slurry in the absorption tower is sprayed downwards from the upper part of the tower and mixed with the upward flowing flue gas in reverse flow. The sulfur dioxide in the flue gas（SO2）Oxygen in the air that reacts with the absorption slurry to generate calcium sulfite and is further blown into it（O2）Oxidation to calcium sulfate（ CaSO4·2H2O）Namely gypsum; The clean saturated flue gas after desulfurization is sequentially treated with a defogger to remove fog droplets, and then discharged into the atmosphere through a flue window by a desulfurization fan.
Scope of Application
Coal fired power plant flue gas desulfurization, kiln desulfurization, chemical tail gas desulfurization, etc.
Product Features
★ High desulfurization efficiency;
★ Wide adaptability to changes in coal type and sulfur content;
★ Mature process technology;
★ The desulfurization by-product gypsum can be utilized;
★ Reliable and stable operation;
★ The highest market share.
process flow
Basic principle of magnesium oxide desulfurization
The wet magnesium oxide process mainly consists of a flue gas system, a slurry preparation system, a washing and absorption system, a dehydration and drying system, etc. The by-product of the device, magnesium sulfite, is roasted in the sulfuric acid plant to produce magnesium oxide, which is then returned to the desulfurization device.
Scope of Application
Suitable for flue gas desulfurization in thermal power generation, steelmaking blast furnace, etc; Magnesium oxide rich production areas have certain installation advantages.
Product Features
★ High desulfurization efficiency;
★ High operational safety and reliability;
★ Low investment costs and small footprint;
★ No secondary pollution;
★ Low operating costs;
★ Wide range of applications.
process flow
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