Low energy consumption water-saving type flue gas de-whitening device and method

Abstract

The invention provides a low energy consumption water-saving type flue gas de-whitening device. The device comprises a heat exchanger, a fan, a flue gas duct, a hot air tube, a mixed air duct and centrifugal separation tubes, the two sides of the heat exchanger are respectively connected with the fan and the hot air tube, and the centrifugal separation tubes are vertically arranged in the heat exchanger; the flue gas duct communicated with the centrifugal separation tubes is arranged at the top of the heat exchanger, the mixed air duct communicated with the centrifugal separation tubes is arranged at the bottom of the heat exchanger, the hot air tube is communicated with the mixed air duct and then communicated with a chimney, and inlet vanes are arranged at the tops of the centrifugal separation tubes. The invention further provides a low energy consumption water-saving type flue gas de-whitening method. The method comprises the following steps that flue gas enters the centrifugal separation tubes in the heat exchanger from the flue gas duct, cold air is transported to the heat exchanger through the fan, and heat exchange is conducted on the flue gas and the cold air. The device utilizes natural air (cold air) for heat exchange to achieve the purpose of saving energy consumption; the device adopts a cyclone centrifugal pipeline, and the de-whitening efficiency is improved.

Description

technical field [0001] The invention relates to a reactor for flue gas treatment, in particular to a low-energy and water-saving flue gas dewhitening device and method. Background technique [0002] At present, wet desulfurization has become a common technology for flue gas treatment in the world, and it is a relatively mature process. Since Germany and Japan introduced this technology in China, more than 90% of large thermal power units have adopted this method, but wet desulfurization is still effective in improving SO 2 At the same time as the removal rate, it also brings new problems. [0003] In Germany and Japan, GGH is the standard device for wet desulfurization, because both countries have specific requirements for exhaust gas temperature. At the beginning of technology introduction, GGH was also installed in most domestic systems, but with the system running, the disadvantages of GGH, such as easy blockage and corrosion, gradually emerged. Since there is no specif...

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Problems solved by technology

However, the volume of the flue gas after air mixing will be obvious except for the temperature drop, and the increase in volume will reduce the relative humidity of the flue gas, which is not conducive to water removal; in many cases, the air mixing is to reduce the saturation instead of increasing the saturation

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