Double-tower serially-connected device and method for removing SO2 and NOx from smoke by using biological method

Abstract

The invention discloses a double-tower serially-connected device and a method for removing SO2 and NOx from smoke by using a biological method, belonging to the field of waste gas treatment. The smoke in a flue sequentially enters a cooling dust removing tower, a packed tower I and a packer tower II through a draught fan, wherein defogger devices are respectively arranged on the tops of the cooling dust removing tower, the packed tower I and the packer tower II; spraying layers are respectively arranged below the defogger devices; circulating liquid storing devices are respectively arranged on the packed tower I and the packed tower II; an aerating device and a stirring device are arranged in each circulating liquid storing device. A pH value on-line monitor and an automatic feeding device which is connected with the pH value on-line monitor are also arranged in each circulating liquid storing device. The device disclosed by the invention can be used for preventing changes of the liquid level of circulating liquid and also preventing fluctuation of the pH value of the circulating liquid so as to further improve the removal effect on the SO2 and the NOx in the smoke.

Description

technical field [0001] The invention belongs to the field of waste gas treatment, and in particular relates to a biological method for removing SO in flue gas 2 and NO x The double-column series device and method. Background technique [0002] Currently, SO emissions from industrial activities 2 and NO x As a source of environmental pollution, the harm to the environment is becoming more and more obvious, and this problem has always been the main subject of research and governance in countries around the world. With the development of industrial technology, people hope to develop new technologies and equipment that can simultaneously remove SO in exhaust gas 2 and NO x remove. The search for technologically advanced and economically reasonable new flue gas simultaneous desulfurization and denitrification technology and equipment has always been one of the frontier research hotspots of new technologies and equipment in the field of environmental protection. At present,...

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Problems solved by technology

However, because this technical method uses a front-end catalytic-biofilm packed tower system connected in series with a rear-end biofilm packed tower system, the raw flue gas is pretreated and passes through two packings in sequence, but because the process is saturated wet flue gas, it will flow from The front-end carries a large amount of circulating fluid into the back-end, which not only affects the liquid level of the front-end circulating fluid, but also causes serious fluctuations in the pH of the back-end circulating fluid, affecting the growth of microorganisms, and thus affecting the SO 2 and NO x Once the pH value changes, it is necessary to add buffer components to adjust the pH value of the circulating fluid, and the buffer components must be added in time, otherwise the growth of microorganisms will be inhibited or even die

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