Flue gas pollutant combination removal method based on high-activity solid absorbent

Abstract

The invention provides a flue gas pollutant combination removal method based on a high-activity solid absorbent. The flue gas pollutant combination removal method comprises: uniformly mixing an oxidant into boil tail flue gas to obtain oxidized flue gas, wherein the NO in the flue gas is oxidized into a high-valence nitrogen oxide, and the zero-valence mercury is oxidized to a high-valence mercuride; making the oxidized flue gas completely contact solid particles, and simultaneously removing the sulfur oxide, the high-valence nitrogen oxide and the high-valence mercuride in the flue gas so asto obtain pollutant-removed dust-containing flue gas; and carrying out dust removing on the dust-containing flue gas to obtain clean flue gas, wherein the solid particles collected from the bottom portion of a dust removing device are fed into a material storage bin, the partial solid particles are activated and humidified, the activated and humidified solid particles returns to the reactor so asto continuously participate in the reaction, and the remaining solid particles are discharged from the bottom portion of the material storage bin so as to maintain the material balance. According to the present invention, the semi-dry absorption method is used, wherein the calcium-based absorbent is sprayed into the reactor in the form of the humidified solid particles, such that the water consumption is low, the final product is the solid-state product, the treatment of the wastewater is not required, the process is simple, and the method can be widely used in the industrial flue gas treatment.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for combined removal of flue gas pollutants based on a high-activity solid absorbent, which is suitable for coal-fired industrial boilers and industrial kilns. Background technique [0002] At present, environmental protection standards are becoming increasingly strict, but small and medium-sized industrial boilers and industrial kilns often have the characteristics of small capacity, high pollutant concentration, small site, and difficult pollutant treatment, which makes treatment and transformation difficult. Compared with the low emission of large-scale power plant boilers, intensive, compact, and integrated dust removal, desulfurization, and denitrification collaborative removal technologies are the development direction of low-emission industrial boilers. [0003] The patent with the publication number CN104474857A discloses a method and device for ...

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Problems solved by technology

[0003] The patent with the publication number CN104474857A discloses a method and device for pre-oxidizing active molecules to absorb NO and SO2 in coal-fired flue gas. The strong oxidizing property of active molecular ozone is used. Higher, but the water consumption is large and the waste liquid treatment process is more complicated

[0004] Publication No. CN105056749A patent discloses a method for simultaneously removing nitrogen oxides and sulfur oxides in flue gas. This patent utilizes the catalytic oxidation of NO by a calcium-based desulfurizer, but actual industrial tests have found that the catalytic oxidation efficiency is not High, resulting in low denitrification rate, this patent also mentions that the removal rate of NOx is only above 65%

In addition, due to the humidification method of spraying water in the circulating fluidized bed tower, it is easy to cause the nozzle in the reactor to be blocked, and the local material is too wet to cause the material to stick to the wall and other problems.

[0005] Publication No. CN200610102077.5 patent discloses a method and device for simultaneous desulfurization, denitrification and demercuration of boiler flue gas. The oxygen-enriched high-activity absorbent is sprayed into the circulating fluidized bed reactor for simultaneous desulfurization, denitrification and demercuration. The removal efficiency is low, and the wet absorbent preparation (digestion) process is adopted, and the process is relatively cumbersome

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