Thermal power plant desulfurization methods

There are many desulfurization methods

(1) Limestone and gypsum flue gas desulfurization process

Limestone and gypsum desulfurization process is the most widely used desulfurization process in the world. Technology, about 90% of flue gas desulfurization devices used in thermal power plants in Japan, Germany and the United States use this process.

(2) Flue gas desulfurization process by rotary spray drying

(3) Flue gas desulfurization process by ammonium phosphate fertilizer method< /p>

(4) Calcium spray tail in Furnace Humidified Flue Gas Desulfurization Process

(5) Flue Gas Circulating Fluidized Bed Desulfurization Process

p>

(6) Seawater desulfurization process

(7) Electron beam method Desulfurization process

(8) Desulfurization processation by ammonia washing method

Post-combustion desulfurization, also known as flue gas desulfurization (FGD for short), in FGD technology, depending on the desulfurization agent. The types are divided into the following five methods: calcium method based on CaCO3 (limestone), magnesium method based on MgO, sodium method based on Na2SO3, ammonia method based on NH3, alkali method organic based on the organic alkali method. The most widely used commercial technology worldwide is the calcium method, which accounts for more than 90%.

Hydrated lime is commonly used in thermal power plants to absorb sulfur dioxide gas produced by coal combustion and recover useful gypsum.

Assume x grams of limestone containing 80% calcium carbonate is required to obtain sulfuric acid containing calcium 80% crude product y grams

2CaCO3+2SO2+O2=2CaSO4+2CO2

2*100 2*64 2*136

x *80 % 6.4 y*80%

List the calculation of the proportion

x=200*6.4/(2*64*0.8)=12.5 g

y =2 *136*6.4/(2*64*0.8)=17 g

In thermal power plants, limestone slurry is used to absorb sulfur dioxide present in the exhaust gases in order to prevent environmental pollution. 2CaCO 3 (powder) + 2SO 2

SO2+Ca(OH)2=CaSO3+H2O2CaSO3+O2=2CaSO4CaSO4+2H2O=CaSO4.2H2O Overall reaction formula: 2SO2+2Ca(OH)2+O2+ 2H2O=2CaSO4.2H2O< /p>