Energy-saving and consumption-reducing flue gas pre-scrubbing device for wet flue gas desulfurization system

Abstract

The invention discloses an energy-saving and consumption-reducing flue gas pre-scrubbing device for a wet flue gas desulfurization system. The flue gas pre-scrubbing device comprises a pre-scrubbing slurry buffer tank, wherein a pre-scrubbing slurry buffer tank stirrer is positioned on the top of the pre-scrubbing slurry buffer tank, two side ends of a pre-scrubbing slurry circulating pump are respectively connected with a spraying device and the pre-scrubbing slurry buffer tank, and two side ends of a pre-scrubbing drain pit pump are respectively connected with a pre-scrubbing drain pit and the pre-scrubbing slurry buffer tank; a pre-scrubbing drain pit stirrer is positioned on the top of the a pre-scrubbing drain pit; the spraying device comprises an induced draft fan flue and a nozzle, two side ends of the spraying device are respectively connected with a boiler induced-draft fan and an absorbing tower inlet, and the lower end of the spraying device is connected with the pre-scrubbing drain pit. According to the flue gas pre-scrubbing device disclosed by the invention, the defects such as too much oil dirt in flue gas, high temperature and high dust concentration in the prior art are overcome.

Description

technical field [0001] The invention relates to the field of desulfurization equipment, in particular to a flue gas pre-washing device for energy saving and consumption reduction of a wet flue gas desulfurization system. Background technique [0002] At present, the desulfurization of thermal power units in my country mainly adopts limestone / gypsum wet flue gas desulfurization technology, which not only reduces the emission of air pollutants in power plants and improves the environment, but also significantly increases energy consumption; FGD (limestone / gypsum wet flue gas desulfurization) The system is mainly composed of flue gas subsystem, SO 2 Absorption subsystem, limestone slurry preparation and supply subsystem, gypsum dehydration subsystem and accident slurry subsystem, etc. Each subsystem includes many energy-consuming equipment such as pumps and fans, and the energy consumption characteristics of each energy-consuming equipment vary greatly; Among them, the booster ...

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Problems solved by technology

[0004] However, after canceling the FGD (limestone / gypsum wet flue gas desulfurization) system flue gas bypass, any flue gas generated during the operation of the main engine will enter the desulfurization system at all times, and the soot concentration at the FGD (limestone / gypsum wet flue gas desulfurization) inlet It also affects the normal operation and power consumption of the desulfurization device; the main reason is that after a long period of operation, the acid-insoluble matter and fly ash in the flue dust are easily deposited in the flue, fan blades, GGH (flue gas-flue gas reheater) Deposition and fouling on equipment such as demisters and demisters will increase system resistance and increase power consumption of induced draft fans; in addition, heavy metals and fluoride ions in the smoke have a shielding effect on the dissolution of limestone; the smoke concentration remains high for a long time level, the pH value of the slurry in the absorption tower will be low, and the amount of limestone slurry will be additionally increased, resulting in prolonged running time of the ball mill and increased power consumption; therefore, the technical problem that needs to be solved is to eliminate the above-mentioned disadvantages adverse effects to ensure the normal operation of the desulfurization system after canceling the bypass

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