Device and method for flue gas desulfurization in thermal power plant

Abstract

The invention discloses a device and a method for flue gas desulfurization in a thermal power plant. The device includes a chimney, a regenerative heat exchanger, a self-priming pulse jet desulfurizer, a separation tower, a slurry regulating system and an induced draft fan. The chimney communicates with the regenerative heat exchanger. The regenerative heat exchanger is connected to the separationtower through the self-priming pulse jet desulfurizer. The separation tower communicates with the self-priming pulse jet desulfurizer through the slurry regulating system. The separation tower communicates with the regenerative heat exchanger through the induced draft fan. The device and the method for flue gas desulfurization in a thermal power plant has the following beneficial effects: complexequipment for flue gas extraction, slurry mixing and the like in a typical desulfurization process is realized by a set of equipment, which makes the desulfurization process simpler and easier in popularization; and mixing methods which are most important in the desulfurization process are innovatively innovated, the conventional mixing methods such as spraying and mist spraying are converted into suction mixing, and an impeller is directly used to throw slurry out at high speed in a form of blocks part by part to form vacuum extraction flue gas, which realizes highly ordered mixing and improves the mixing efficiency.

Description

technical field [0001] The invention relates to the technical field of energy saving in thermal power plants, in particular to a device and method for flue gas desulfurization in thermal power plants. Background technique [0002] Flue gas desulfurization technology is currently recognized as the most effective technology for controlling sulfur dioxide pollution. The typical gypsum flue gas desulfurization technology is to use the limestone-containing slurry to wash the flue gas to neutralize the sulfur dioxide in the flue gas to achieve flue gas desulfurization emissions. The mixing degree and effect of flue gas and slurry directly affect the effect of flue gas desulfurization. In order to fully mix flue gas and slurry, the existing method uses an absorption tower for countercurrent mixing. The typical mixing process is: the limestone slurry is sprayed downward from the upper part of the tower and mixed with the flue gas flowing upwards in countercurrent. The sulfur dioxid...

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Problems solved by technology

[0003] The flue gas desulfurization method using limestone slurry is the most extensive and mature flue gas desulfurization control technology, but since the key to desulfurization efficiency lies in the mixing intensity of the slurry and flue gas, the core of its technology development is how to make the flue gas Fully mixed with the slurry, although the typical enhanced mixing methods such as spraying, stirring, spraying and other technologies can achieve a flue gas desulfurization efficiency of more than 95%, but the high energy consumption and complicated process structure introduced by it

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