Travertine Stone At present, most of FGD is limestone-gypsum wet desulfurization process. Desulphurization agent for Limestone (CaCO3) and water preparation of the concentration of 30% of suspended slurry, the principle is to introduce flue gas into the absorber tower, make the sulfur dioxide in flue gas and limestone slurry fully contact with chemical reaction, produce half water calcium sulfite, and then after the reaction with the forced oxidation of air to produce calcium sulfate, after the separation of gypsum slurry cyclone and vacuum dehydration system dehydration to produce a by-product gypsum, so as to remove sulfur dioxide in the flue gas. The limestone block is transported from the unloading truck to the factory and discharged into the unloading hopper, Travertine Stone and the upper part of the hopper is provided with a vibrating steel grate which prevents the large size limestone from entering, and the lower part is provided with a vibrating conveyor. Bucket elevator will be transported limestone to Sankang buried scraper conveyor. A limestone silo discharging port corresponds to a grinding machine system. Travertine Stone The discharging port is provided with an electromagnetic vibrating feeder and a weighing belt conveyor, weighing belt conveyor after weighing into the wet ball mill, wet ball mill made of 20%-30% of the concentration of limestone slurry, and then according to the absorption tower slurry ph value needs from the limestone slurry pump to the absorption tower slurry pool for the reaction.
1.2 Working principle of wet ball mill
Wet-type ball mill is a low-speed cylindrical grinder, steel balls and limestone through the rotating cylinder in the rotation of friction and centrifugal force by the lifting strip to a certain altitude, because of gravity, it will be thrown, limestone in the impact and grinding action crushed. Limestone in the wet ball mill is milled into slurry and artesian to the circulation box, and then from the ball mill circulation pump to the limestone slurry cyclone. The bottom flow of cyclone is recycled to the inlet of the wet ball mill, Travertine Stone and the overflow is poured into the limestone slurry tank, and the final wet ball mill is made into 20%-30% limestone slurry, which is pumped from the limestone slurry pump to the absorption tower slurry pool.
1.3 Working principle of limestone cyclone
Gypsum Hydrocyclone is a kind of separation and classification equipment, using the principle of centrifugal sedimentation. The cyclone itself has no power plant, the suspension fluid under certain pressure action under the pressure from the hydrocyclone periphery cuts into the hydrocyclone, Travertine Stone produces the intense eddy current, the internal Eddy current continues movement. Because of the particle size difference between coarse particles and fine particles, which is affected by centrifugal sedimentation, the bulk particles are discharged by the bottom flow of the cyclone, and most of the fine particles are discharged by the overflow tube, and the separation classification is achieved.
The fineness of limestone slurry refers to the size of the limestone particles in the slurry, which directly relates to the increase of the consumption of limestone slurry in the absorber tower, which also increases the power consumption of the slurry circulating pump. As well as the abnormal wear of the impeller, substandard slurry in the bottom of the absorption tower caused by slurry deposition, Travertine Stone when pushed to a certain height after plugging slurry circulation pump imports lead to the system liquid-gas ratio drop, improve the operating costs of the system, in the long-term will lead to incomplete reaction of calcium sulfite adhesion on the surface Cause the condition of the sulfite blinding. The final effect of desulphurization efficiency and the quality of by-product gypsum. Serious impact on Environmental protection indicators and Unit safety and economic operation.
In order to ensure the desulfurization efficiency of unit, reduce the bottom deposition of absorber tower, reduce the consumption of limestone and the energy consumption of ball mill, Travertine Stone we need to improve the fineness of limestone slurry to improve the reaction degree of the slurry and sulphur dioxide. The failure of the hydrocyclone overflow fineness is the main factor that causes the fineness of limestone slurry to be unqualified. If the problem can be solved effectively, it can improve the fineness of limestone slurry to ensure the quality of the slurry.