Ultra-low emission circulating fluidized bed boiler with three stages of desulfurization systems

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...

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Problems solved by technology

[0010] Obviously, the existing technology has low desulfurization efficiency, high operating costs, and poor quality of fly ash that cannot be comprehensively util...

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