Combined flue gas pollutant removal system based on high active solid absorbent

Abstract

The invention discloses a combined flue gas pollutant removal system based on a high active solid absorbent. The combined flue gas pollutant removal system includes an oxidation reaction flue, a desulfurization denitrification demercuration reactor, a dust removal unit and a spent absorbent storage, activation and humidification unit; an ozone spraying module is disposed in the oxidation reactionflue; the outlet of the oxidation reaction flue is connected with the inlet of the desulfurization denitrification demercuration reactor; the outlet of the desulfurization denitrification demercuration reactor is connected with the dust removal unit; the flue gas outlet of the dust removal unit is in turn connected to an induced draft fan and a chimney; and the outlet of a dust falling outlet of the dust removal unit is connected with the spent absorbent storage, activation and humidification unit. When the system is used to remove pollutants, a semi-dry absorption method is adopted, the waterconsumption is small, the final product is solid, no treatment of waste water is required, and the process is simple. Therefore, the combined flue gas pollutant removal system can be widely used in industrial flue gas treatment processes.

Description

technical field [0001] The invention relates to a combined removal system of flue gas pollutants based on a high-activity solid absorbent, belonging to the field of flue gas purification. 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 publication number CN104474857A discloses that active molecules pre-oxidize and absorb NO and SO in coal-fired flue gas 2 The method and device utilize the strong o...

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Problems solved by technology

[0003] The patent with publication number CN104474857A discloses that active molecules pre-oxidize and absorb NO and SO in coal-fired flue gas 2 The method and device use the strong oxidizing properties of active molecular ozone, but the wet lye absorption process adopted downstream, although the desulfurization and denitrification efficiency is high, but the water consumption is large and the waste liquid treatment process is relatively 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. High, resulting in low denitrification rate, the patent also mentioned 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 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, but nitrogen oxides The removal efficiency is low, and the wet absorbent preparation (digestion) process is adopted, and the process is relatively cumbersome

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