Device and method for removing PM 2.5 from smoke

Abstract

The invention discloses a device for removing PM 2.5 from a smoke. The device is characterized in that: the device comprises a removing tower, a wet electrical dust precipitator and one or more wetting spray apparatuses; the lower part of the removing tower is provided with a smoke inlet end; the smoke inlet end of the removing tower is provided with a particle charging zone and a mixing coagulation zone; the particle charging zone is divided into a positive corona discharging zone and a negative corona discharging zone; an anode is arranged in the positive corona discharging zone; a cathode is arranged in the negative corona discharging zone; at least one stage of wetting spray apparatus is arranged in the removing tower which is above the smoke inlet end; the wet electrical dust precipitator is arranged in the removing tower which is above the wetting spray apparatus; and the top of the removing tower is provided with a smoke outlet. The invention also discloses a method for removing PM2.5 from the smoke. The method sequentially comprises steps of particle charging, mixing coagulation, dust wetting tempering, and wet electrical precipitation. The device and the method have the following advantages: fine dust PM2.5 can be removed from fire coal; fine particles of acid mist, heavy metal particles and the like can be removed from the smoke; and the PM2.5 removal rate is equal to or greater than 95%.

Description

technical field [0001] The invention relates to a method for removing PM from flue gas 2.5 devices and methods. Background technique [0002] PM 2.5 Fine dust refers to particle pollutants with an aerodynamic diameter of less than 2.5 μm. It is an important factor causing the spread of respiratory diseases. These particles are suspended in the air for a long time without settling, and are easy to carry bacteria and viruses. 80% of the particles can enter the human body It is one of the main causes of lung disease. In order to prevent the harm of PM2.5 particles to human beings, the United States has been in the original PM as early as 1997 10 Added PM to the standard 2.5 emission standards, and stipulates PM 2.5 The three-year average annual concentration of the 3 , the average 24h concentration of 99% in three years is lower than 15μg / m 3 . [0003] Coal-fired power plant flue gas is PM 2.5 one of the largest sources of emissions. The basic characteristics of my c...

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Problems solved by technology

[0004] The object of the present invention is to provide a method for removing PM from flue gas 2.5 The device and method can effectively solve the problem of existing dust control technology and equipment on PM 2.5 However, the removal ability is negligible, causing a great problem of environmental pollution

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