Method for preparing highly active lime by calcining limestone chips in a circulating fluidized bed furnace
A technology of circulating fluidized bed and calcining limestone, which is applied in the direction of lime production and the like, achieves the effects of simple process method, improved utilization rate and yield, and improved utilization rate of raw materials
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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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