Slaked lime feeding device for half dry desulfurization of coal-fired flue gas

Abstract

The invention relates to the technical field of desulfurization of coal-fired flue gas and particularly relates to a slaked lime feeding device for half dry desulfurization of coal-fired flue gas. Thedevice comprises a stock bin, a roof scrubber arranged on the top of the stock bin, a conveying pipeline communicating to the bottom end of the stock bin and extending downward, a variable frequencyflow control electric valve connected to the conveying pipeline in series, a first particle concentration detector arranged in a flue gas inlet channel of a desulfurizing tower, a second particle concentration detector arranged in a circulating ash reflux tank of the desulfurizing tower and a controller; the first particle concentration detector, the second particle concentration detector and thevariable frequency flow control electric valve are electrically connected to the controller, separately; an annular divider is arranged at the discharge port of the lower end of the conveying pipeline; the discharge port of the annular divider communicates to a plurality of feeding holes for feeding distributed along the circumference of the wall of the desulfurizing tower on the desulfurizing tower. The slaked lime feeding device provided by the invention is uniform to charge and high in desulfurizing efficiency.

Description

technical field [0001] The invention relates to the technical field of coal-fired flue gas desulfurization, in particular to a slaked lime feeding device for semi-dry desulfurization of coal-fired flue gas. Background technique [0002] Boiler coal-fired flue gas contains a large amount of sulfur dioxide and other acid gases, which must be desulfurized and dust-removed before being discharged. Usually desulfurization is carried out in the desulfurization tower. In the desulfurization tower adopting semi-dry desulfurization, the sulfur dioxide and other acid gases in the flue gas react with the alkaline slaked lime and atomized water added to the desulfurization tower to generate calcium sulfite. and calcium sulfate and other calcium salts to remove sulfur dioxide and other acid gases. In the subsequent treatment process, the flue gas circulating ash desulfurized by the desulfurization tower is then dedusted by the dust collector, and the flue gas circulating ash after dust ...

AI Technical Summary

Problems solved by technology

[0004] First, the existing slaked lime feeding device is only provided with one feed port when feeding into the desulfurization tower, which is likely to cause uneven dispersion of slaked lime after being added to the desulfurization tower, and the unevenly dispersed slaked lime is likely to cause the slaked lime to fall into the desulfurization tower on the one hand. The bottom of the desulfurization tower causes waste of resources. On the other hand, it causes insufficient contact between the slaked lime and the flue gas in the desulfurization tower, resulting in a decrease in desulfurization efficiency; Automatically adjusts to volume changes for feed optimization

[0005] Second, because the upper part of the silo of the slaked lime feeding device needs to be connected to the dust collector on the top of the silo, there is ventilation between the inside of the silo and the outside air, and the slaked lime placed in the silo is easy to absorb moisture, resulting in fouling of the silo and the conveying pipeline Or blockage; because the silo is generally large, manual cleaning is more troublesome

[0006] Third, there is generally only an ordinary material level indicator on the silo. When using a slaked lime feeding pump truck to feed the silo, it is necessary to manually monitor the material level in the silo. When the material level is reached, the manual stop operation is automated. to a lesser extent

[0007] Fourth, the connection position between the discharge port of the material conveying pipeline and the desulfurization tower has not been optimized. If the position of the discharge port is too low or too high, it will easily lead to insufficient mixing of slaked lime powder and flue gas, and the slaked lime cannot be fully utilized, resulting in desulfurization. Reduced efficiency

Images