Method for preparing high-activity lime by calcining limestone chips with circulating fluidized bed
A technology of circulating fluidized bed and calcining limestone, applied in lime production and other directions, to achieve the effects of less heat energy waste, simple process method and energy saving
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Embodiment 1
[0058] The method for preparing highly active lime by calcining limestone chips in a circulating fluidized bed furnace comprises the following steps:
[0059] a. Sieve the limestone chips into coarse particles, fine particles and fine powder, and put them into the dense-phase zone 3, the suspension section 5 and the high-temperature cyclone separator 7 in the circulating fluidized bed furnace for calcining; wherein the 1-5mm coarse Granular limestone is mainly fed into the dense phase zone 3, fine particles of 0.5-1 mm are fed into the suspension section 5, and powder materials smaller than 0.5 mm are fed from the inlet of the high-temperature cyclone separator 7;
[0060] b. Maintain the temperature of the circulating fluidized bed furnace at 850-900°C, maintain the temperature at the flue gas outlet 8 of the high-temperature cyclone separator at 700-720°C, and control the temperature in the dense phase zone 3 at 900-950°C.
Embodiment 2
[0062] The method for preparing highly active lime by calcining limestone chips in a circulating fluidized bed furnace comprises the following steps:
[0063] a. Sieve the limestone chips into coarse particles, fine particles and fine powder, and put them into the dense phase zone 3, suspension section 5 and high-temperature cyclone separator 7 of the circulating fluidized bed furnace for calcining; Granular limestone is mainly fed into the dense phase zone 3, fine particles of 0.5-1 mm are fed into the suspension section 5, and powder materials smaller than 0.5 mm are fed from the inlet of the high-temperature cyclone separator 7;
[0064] b. Maintain the temperature of the circulating fluidized bed furnace at 900-950°C, maintain the temperature at the flue gas outlet 8 of the high-temperature cyclone separator at 720-750°C, and control the temperature in the dense phase zone 3 at 950-1000°C.
experiment example 1
[0066] 1 ton / hour of limestone chips with a particle size less than 10mm is sieved into coarse particles, fine particles and fine powder, and put into the dense phase zone, suspension section and high-temperature cyclone separator 7 in the circulating fluidized bed furnace respectively; The coarse particle is that the particle size is 1.5mm, and the mass fraction of the particle on the sieve is 70-75%, and the fine powder is that the particle size is 0.3mm, and the mass fraction of the part under the sieve is 80-90%. %, the fine particles are wherein more than 70-85% of the particle size is 0.3-1.5mm;
[0067] The furnace temperature of the circulating fluidized bed is maintained at 850-950°C, the flue gas outlet temperature of the high-temperature cyclone separator is maintained at 700-750°C, and the temperature of the dense phase zone is 900-1000°C.
[0068] After the calcination is complete, the high-activity lime with a particle size of less than 200 microns is recovered f...
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