A wet and dry combined flue gas desulfurization system and desulfurization method

Abstract

The invention discloses a flue gas desulfurization system and a desulfurization method thereof. The desulfurization system includes a dust removal booster system, a wet desulfurization system and a dry desulfurization system; The inlet end of the desulfurization system is connected; the outlet end of the wet desulfurization system is connected to the inlet end of the dry desulfurization system. Using the invention to perform desulfurization treatment on sulfur-containing flue gas can synergistically remove various pollutants, and fundamentally eliminate environmental problems caused by wet chimney discharge.

Description

technical field [0001] The invention belongs to a flue gas desulfurization system and a desulfurization method, in particular to a desulfurization system and a desulfurization method combining wet and dry methods. Background technique [0002] Controlling sulfur dioxide produced during the use of coal and other energy sources has always been a key research direction for environmental protection. There are two main types of flue gas desulfurization processes: dry process and wet process. The dry process is represented by circulating fluidized bed flue gas desulfurization (CFB-FGD), typical processes include Lurgi type (Lurgi), reflux type (RCFB), gas suspension absorption type (GSA) and humidified ash circulation (NID) and other desulfurization processes. The common feature of these processes is that the high-speed flue gas is fully contacted with the dense suspended particles (desulfurizer) carried, thereby strengthening the desulfurizer (usually calcium-based, Ca(OH) 2 )...

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Problems solved by technology

Although this process has significant advantages such as desulfurization efficiency as high as 99%, maintaining calcium-sulfur ratio at 1.03-1.05, and reliable operation, it still has high initial investment costs, high energy consumption, difficult wastewater treatment, and humidity in flue gas after desulfurization. Large, low temperature, SO 3 The formation of aerosols is difficult to diffuse and other problems

[0003] CN102698590A discloses a dry and wet combined flue gas desulfurization system, that is, a dry desulfurization system is connected in series before the original wet desulfurization system. However, it cannot completely solve the problems existing in the existing wet process such as low exhaust gas temperature, high humidity and SO 3 Defects such as low removal efficiency

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