The third generation cireulating fluidized bed boiler and its system
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Supported by Institute of Engineering Thermophysics, ChineseAcademy of Sciences, the developed high parameter (parametercan be customized) CFB boiler has the following technical characteristics: 1) ful membrane hearth structure, good sealing perfor-mance. 2) using high-efticiency cyclone separator, can effectivelycapture the fine particles in the fiue gas, the separation efficiencyis high, so that the circulating material quantity can be guaranteedreliably, The reasonable internal design makes it have the characteristics of light wear, low resistance and good reliability, 3) adopinon-mechanical u-type self-balance return, the material level hasself-balance ability, and at the same time prevent the smoke fromanti-channeling, the return air is provided by the special high-pres-sure fluidization fan, throuqh the adjustment, make the materialreturn to the furnace smoothly, ensure the material stable trans-portation. 4) the Air Distribution Board is made of water-cooledwall tube, and the air cap is arranged between the tubes to formthe membrane water-cooled Air Distribution Board, which makesthe whole air chamber have good thermal expansion, easy to sealnot easy to leak, and ensures the even distribution of pressure inthe air chamber. 5) uniform distribution of cowl, ensure uniformfluidization of materials, prevent slagging, use high-quality heat-resistant cast steel as cowl material, pius unique structure, make iwear-resistant, oasy maintenance, with a strong anti-slag leakagefunction, 6} because of the high ash concentration in the circula-tion loop of the circulating fluidized bed boller combustion systemthe anti-wear of heating surface should be handled carefuly. Inorder to ensure the long-term and reliable operation of the boiler,the principle of antiwear position prediction and active fortificationis adopted in this scheme, Wear-resistant castable with pin and pinis used in some places where wear is easy to occur, Metal spraying,anti-wear cover and anti-wear measures are used in special places7) DENITRATlON: The technologies of staged air intake and air distribution, uniform coal feeding, and increasing separation officiency can significantly reduce the original NOx emissionconcentration, which is the leading level in China.
