Desulfurizing system based on phase-change activated coke dry process

Abstract

The invention discloses a desulfurizing system based on a phase-change activated coke dry process. The desulfurizing system comprises a flue gas input pipeline, a condensed water inlet pipeline, a condensed water outlet pipeline, a flue gas phase-change heat exchanger, an activated coke desorption tower, a vibration screen, a chimney and N activated coke desulfurizing adsorption towers, the flue gas inlet pipeline is communicated with a flue gas inlet of the flue gas phase-change heat exchanger, a flue gas outlet of the flue gas phase-change heat exchanger is communicated with flue gas inlets of the activated coke desulfurizing adsorption towers, flue gas outlets of the activated coke desulfurizing adsorption towers are communicated with the chimney, activated coke outlets of the activated coke desulfurizing adsorption towers are communicated with an inlet of the activated coke desoprtion tower, an outlet of the activated coke desorption tower is communicated with activated coke inlets of the activated coke desulfurizing adsorption towers through the vibration screen, and the condensed water outlet pipeline is communicated with a condensed water outlet of a flue gas phase-change heat exchanger. The desulfurizing system is low in desulfurizing cost and high in desulfurizing efficiency.

Description

technical field [0001] The invention relates to a desulfurization system, in particular to a desulfurization system based on a phase change active coke dry method. Background technique [0002] In the field of flue gas desulfurization of coal-fired power plants, more than 90% of them currently use limestone-gypsum wet flue gas desulfurization technology. Although this technology is mature and widely used, its shortcomings are gradually emerging during the application process: 1) High water consumption: For power plant boiler flue gas desulfurization devices without flue gas heat exchanger GGH, the equivalent water consumption per million kilowatt units is as high as 150-200m 3 / h; 2) Chimney anti-corrosion and "gypsum rain" problems: the flue gas at the outlet of the wet desulfurization device is saturated wet flue gas, and high-level anti-corrosion must be carried out on the chimney, and the problem of "gypsum rain" on the chimney may also occur, causing damage to the surro...

AI Technical Summary

Problems solved by technology

[0002] In the field of flue gas desulfurization of coal-fired power plants, more than 90% of them currently use limestone-gypsum wet flue gas desulfurization technology. Although this technology is mature and widely used, its shortcomings are gradually emerging during the application process: 1) High water consumption: For power plant boiler flue gas desulfurization devices without flue gas heat exchanger GGH, the equivalent water consumption per million kilowatt units is as high as 150-200m 3 / h; 2) Chimney anti-corrosion and "gypsum rain" problems: the flue gas at the outlet of the wet desulfurization device is saturated wet flue gas, and high-level anti-corrosion must be carried out on the chimney, and the problem of "gypsum rain" on the chimney may also occur, causing damage to the surrounding environment Secondary pollution; 3) Carrying of liquid droplets in clean flue gas: the liquid droplets carried in clean flue gas are gypsum slurry with a concentration of about 20%, which contains certain solid particles, which is dust pollution when discharged into the atmosphere; 4) Limestone Extensive mining and gypsum accumulation: due to the widespread use of limestone-gypsum wet flue gas desulfurization technology, a large number of limestone mountains have been mined, and desulfurization gypsum accumulation in some areas

[0005] The contact reaction time between activated coke and flue gas should be controlled in the activated coke adsorption tower. Generally, the volume of the adsorption tower is large or the number of desulfurization units in the activated coke adsorption tower increases, resulting in a large area of ​​active coke dry desulfurization system and high initial construction investment. In addition, the adsorption and desulfurization efficiency of activated coke is greatly affected by the flue gas temperature. In order to achieve a higher desulfurization efficiency, the initial construction investment will increase. These factors are not conducive to the popularization and application of activated coke dry desulfurization. New system of desulfurization system investment cost

Images