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Dry flue gas desulfurization technology discussion and common problems treatment analysis of magnesium oxide how much a ton

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Dry flue gas desulfurization technology discussion and common problems treatment analysis of magnesium oxide how much a ton

Date:2017-02-24 Author: Click:

In dry desulfurization, temperature, flow rate, residence time, Ca/S ratio, pressure drop and flow field distribution are very important parameters. To ensure desulfurization efficiency, temperature control is the primary means, and pressure drop and Ca/S ratio are important control indicators. The common problems in operation are low efficiency of desulphurization, wet wall of desulphurization tower and collapse bed. The final product of desulfurization is "dry state", which is the dry desulfurization process. Process flow diagram is as follows: flue gas from the bottom side for desulphurization, scripture venturi is accelerated, the divergent section on the upper venturi spray in turn into the absorber Ca (OH) 2 powder and atomized water, flue gas cooling and humidification, water bag Ca (OH) 2 powder droplet surface ionization reaction, generate Ca2 + and OH -, the main control steps of SO2 from the film to the liquid film diffusion, SO2 and H2O ionization generating H + and SO32 - after reaction, produce CaSO3 SO32 - and Ca2 + reaction. The main mass transfer, heat transfer and chemical reaction are as follows: in the reaction process, particles collide with each other and rub against each other, its surface is constantly updated, the flue gas heat will evaporate the desulphurization ash water in the tower, and the final product is in a dry state. After the dust removed from the bag dust collector, most of them return to the desulfurization tower to form an external circulation, and a few of the final products are out. The ash in the tower falls into the tower after being separated by the trough plate separator at the top of the tower, forming an internal circulation. Main advantages of flue gas desulfurization in circulating fluidized bed :(1) simple system and less equipment; (2) save area, less project investment and low operation cost; (3) no corrosion protection is required for the system; (4) effectively remove SO3, almost all of HCl and HF; (5) the system layout is flexible, which is very suitable for the existing unit transformation; (6) the desulfurization by-products are dry, which is conducive to comprehensive utilization and disposal and will not cause secondary pollution. Main shortcomings: (1) the desulfurization tower outlet temperature should be strictly controlled in more than 15-20 ℃ above the dew point temperature. But if the flue gas outlet temperature below 65 ℃, will be affected by any carelessness cause tower wall condensation, wet wall; (2) the Ca/S ratio is high, and there are more unreacted Ca(0H)2 in desulfurization end products; (3) high system resistance; (4) unstable pressure drop operation of fluidized bed will lead to large fluctuation of the concentration of SO2 at the outlet, so it has high requirements on the quality of operators; (5) comprehensive utilization limitation of desulfurization end products; (6) slow reaction rate. The absorbent preparation system mainly includes the quick lime bin, the slaked lime bin, the digester and the matching bag filter, the weighing screw and the electric lock air feeder. In the process of preparation, quicklime reacts with water to give off heat, and water in the hydrated lime evaporates and the hydrated lime becomes powder.

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