An ultra-low emission circulating fluidized bed boiler with three-stage desulfurization system

Abstract

The invention discloses an ultra-low emission circulating fluidized bed boiler with three stages of desulfurization systems. The three stages of desulfurization systems include a front desulfurizing agent adding system, an inner desulfurizing agent conveying system and a deep flue gas desulfurization system, the front desulfurizing agent adding system is positioned in a coal yard area in front of the boiler, the inner desulfurizing agent conveying system is positioned in a plant area of the boiler, and the deep flue gas desulfurization system is positioned in a tail area of the boiler; the front desulfurizing agent adding system comprises a front desulfurizing agent bin and a front desulfurizing agent gravimetric adding machine below the front desulfurizing agent bin, the inner desulfurizing agent conveying system comprises an inner desulfurizing agent bin and an inner desulfurizing agent conveying feeder below the inner desulfurizing agent bin, and an efficient desulfurizing agent circulating system and a flue gas supplementary dust removing device are further arranged on the deep flue gas desulfurization system. The ultra-low emission circulating fluidized bed boiler has the advantages that the systems are simple, are low in running energy consumption, can be regulated and controlled easily and conveniently, are high in desulfurizing agent utilization rate and desulfurization efficiency and free of water resource consumption and are widely suitable to be used with new circulating fluidized bed boilers in an environment-friendly manner and to modify existing circulating fluidized bed boilers in an environment-friendly manner, and space and equipment investment can be effectively saved.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to an ultra-low emission circulating fluidized bed boiler with a three-stage desulfurization system. Background technique [0002] my country is the world's major coal producer and consumer, and also a country that uses coal as its primary energy source. The flue gas produced by coal combustion contains a large amount of pollutants such as sulfur dioxide, nitrogen oxides and heavy metals, causing serious environmental pollution. According to the 2012 Bulletin on the State of the Environment in China, the national emission of sulfur dioxide in waste gas was as high as 21.176 million tons in 2012, and thermal power generation has always been one of the main sources of sulfur dioxide emission. [0003] In order to strengthen environmental protection and achieve the goal of energy conservation and emission reduction, the "Emission Standard of Air Pollutants fo...

AI Technical Summary

Problems solved by technology

The device desulfurizes flue gas in the boiler, cyclone separator and semi-dry desulfurizer. The flue outlet pipe of the device adopts a bifurcated structure, one of which is connected tangentially to the higher part of the semi-dry desulfurizer , The other road is tangentially connected to the lower part of the semi-dry desulfurizer. Since slaked lime is mainly used as the desulfurizer and still needs to be sprayed with water, the water consumption is high and the desulfurization efficiency is low. The fly ash cannot be comprehensively utilized and the scope of application is limited. The requirements of the latest environmental standards

[0010] Obviously, the existing technology has low desulfurization efficiency, high operating costs, and poor quality of fly ash that cannot be comprehensively utilized. In addition, the transformation workload is large, water consumption is high, and the scope of application is small. Regions, water-scarce areas are not applicable

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