Method for removing contaminations under oxygen-enriched combustion condition

Abstract

The invention discloses a method for removing contaminations under an oxygen-enriched combustion condition. In an O2/CO2 combustion mode, adsorbent is sprayed into high-temperature tail flue gas from a coal burning boiler and a garbage incinerator to realize the combined removal of multiple contaminations by chemical reaction and physical adsorption. Metal compounds in the flue gas and volatile S are adsorbed by the adsorbent are converted into solid particulates with an aerodynamic size greater than 1mm which can be easily removed by a dust catcher, thereby greatly reducing the quantity of PM1 formed by metal and S so as to greatly decrease PM1. The most effective adsorbent and the optimum temperature range for removal vary with fuel. When the content of alkali metals (Na and K) in the fuel is greater than 1mg/g or the content of heavy metals (Pb and Cd) is greater than 10mu g/g, Si-Al-based adsorbent, such as kaolin and the like, is used; when the content of sulfur in the fuel is greater than 0.5%, Ca-based adsorbent, such as limestone and the like, is used; and when both the contents of the metals and the sulfur in the fuel are high, mixed adsorbent is used. In the O2/CO2 combustion mode, the optimum temperature range for the combined removal of multiple contaminations by adsorbent spraying is 1000-1200 DEG C.

Description

technical field [0001] The invention belongs to clean combustion and pollutant discharge control technology, and specifically relates to the new type O 2 / CO 2 In the oxygen-enriched combustion mode, the adsorbent is sprayed in the furnace to treat submicron particles (PM 1 , that is, a combined removal method for various pollutants such as particulate matter with an aerodynamic diameter of less than 1 micron), alkali metals, heavy metals, and sulfur. Background technique [0002] with CO 2 The large amount of greenhouse gas emissions represented is the main cause of the greenhouse effect. At present, CO in the atmosphere 2 The concentration is about 385ppm, which is more than 35% higher than the level (280ppm) before the industrial revolution. According to the current growth rate, by the middle of the 21st century, the atmospheric CO 2 The concentration will be doubled. If atmospheric CO 2 When the concentration doubles, the temperature will rise by 1.5-5.5°C. Such a...

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Problems solved by technology

[0008] The object of the present invention is to aim at O 2 / CO 2 The problem of pollutant control under the new combustion method provides a method for removing pollutants under oxygen-enriched combustion, which can realize O 2 / CO 2 Combined removal of submicron particles, alkali metals, heavy metals and sulfur under combustion to reduce emissions of submicron particles

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