Wet-process and dry-process 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 comprises a dust-removing and pressurizing system, a wet-process desulfurization system and a dry-process desulfurization system, wherein the outlet end of the dust-removing and pressurizing system is connected with the inlet ends of the wet-process desulfurization system andthe dry-process desulfurization system; and the outlet end of the wet-process desulfurization system is connected with the inlet end of the dry-process desulfurization system. When the flue gas desulfurization system and the desulfurization method thereof are used for desulfurizing sulfur-containing flue gas, a variety of pollutants can be synergistically removed and the environmental problems caused by discharge from a wet chimney are fundamentally eliminated.

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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