Power plant emissions of sulfur dioxide main ways are: coal washing, clean coal combustion technology and flue gas desulfurization. Coal Washing currently only partial removal of inorganic sulfur coal for coal organic sulfur removal technology not yet economically viable. Although clean coal combustion technology has proven commercial technology, but stand-alone capacity is not large; and a large investment, high technical requirements, it is difficult in a short time in the country in large scale use ...
Circulating fluidized bed flue gas desulfurization (dry FGD) process characteristics: CFB FGD process by portion absorbent preparation, absorption, desulfurization ash recirculation, filter and control system components. The process is commonly used as a dry powder of lime absorber, can also be used for other reactions of sulfur dioxide absorption capacity as the absorbent powder or slurry. Furnace Sorbent Injection humidifier rear flue gas desulfurization (LIFAC) process characteristics: coal-fired boilers in the appropriate temperature zone of limestone powder spray, and after the boiler air preheater additional activation reactor for removal of flue gas SO2. Its small craft investment, small footprint, no wastewater discharge.
The first stage
Beneficiation, crushing limestone, ground powder 200-300 purpose.
The second stage
The limestone powder made by adding water as the absorbent slurry is pumped into the absorber full contact with the flue gas mixing.
The third stage
Flue gas sulfur dioxide with calcium carbonate slurry and the oxidation reaction column from the lower portion air blown calcium sulfate, calcium sulfate after a certain saturation, the formation of gypsum crystals. Absorber is discharged through the concentrated gypsum slurry, dehydrated to a moisture content less than 10%.
The fourth stage
By conveyor to the dehydration of gypsum stack silos, flue gas desulfurization after removing the droplet through the demister, and then after a heat exchanger to heat up the chimney into the atmosphere.
At present, a lot of sulfur dioxide in urban air pollution, coal-dominated energy consumption structure is the most important cause of sulfur dioxide pollution worsening. Coal-fired power stations are the main coal consumption, its sulfur dioxide emissions have been close to 50% of the total emissions of the whole society. This feature determines the control of sulfur dioxide emissions from coal burning is the focus of sulfur dioxide pollution control, control of sulfur dioxide emissions from coal-fired thermal power plant to control sulfur dioxide pollution is a major breakthrough. Since 2000, the state developed a "two control zones of acid rain and sulfur dioxide pollution control" 15 "plan" in the acid rain control zones and sulfur dioxide control area (two control zones), the focus will cut sulfur dioxide emissions control on fire on pollution power plants, has taken a series of measures. Coal-fired flue gas desulphurization technology is currently the most widely used, the maximum efficiency of desulfurization technology. For coal-fired power plants in the future, a fairly long period of time, FGD will be the main way to control SO2 emissions. At present, domestic and international trends FGD technology are: high desulfurization efficiency, large capacity, advanced technology, investment, small footprint, low operating costs, high degree of automation, reliability and so on.