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Flue gas desulfurization and denitration method

A technology for desulfurization, denitrification, and flue gas, which is applied in the field of flue gas purification, can solve the problems of impact and low denitrification efficiency, and achieve the effects of high efficiency, small equipment footprint, and low investment costs

Active Publication Date: 2016-08-17
HUATIAN ENG & TECH CORP MCC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the above-mentioned traditional oxidation absorption method, the denitrification efficiency is not high or it is easily affected by SO 2 Influenced by the problem, the present invention provides a method for flue gas desulfurization and denitration that can realize synchronous desulfurization and denitrification

Method used

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Embodiment 1

[0061] The method of flue gas desulfurization and denitrification in this embodiment will be specifically described by taking the flue gas treatment of a coal-fired power plant as an example.

[0062] The temperature of flue gas after dust removal in a coal-fired power plant is 190°C, SO 2 The concentration is 800mg / m 3 , NO concentration is 600mg / m 3 . 2% hydrogen peroxide solution is stored, and the flue gas after dust removal enters the Venturi mixer 2 and mixes with the 2% hydrogen peroxide solution in the hydrogen peroxide solution storage tank 1 . Hydrogen peroxide converts part of the SO 2 and NO are oxidized to SO 3 and NO 2 . Then the flue gas enters the absorption tower 11, and the SO produced by pre-oxidation 3 and NO 2 Dissolved in the absorption liquid to generate sulfuric acid and nitric acid respectively, at the same time, ethylenediamine cobalt in the absorption liquid catalyzes the oxidation of residual NO into high-valence nitrogen oxides. The alkali...

Embodiment 2

[0069] The method of flue gas desulfurization and denitrification in this embodiment is described by taking the treatment of flue gas from a sintering machine in a steel plant as an example.

[0070] The temperature of the flue gas from a sintering machine in a steel plant is 150°C after dust removal and waste heat recovery, SO 2 The concentration is 2000mg / m 3 , NO concentration is 700mg / m 3 . The flue gas after dedusting enters Venturi mixer 2 and mixes with 10% hydrogen peroxide solution. Hydrogen peroxide converts part of the SO 2 and NO are oxidized to SO 3 and NO 2 . Then the flue gas enters the absorption tower 11, and the SO produced by pre-oxidation 3 and NO 2 Dissolved in the absorption liquid to generate sulfuric acid and nitric acid respectively, at the same time, ethylenediamine cobalt in the absorption liquid catalyzes the oxidation of residual NO into high-valence nitrogen oxides. The alkaline slurry is 5% urea solution, and the amount of urea solution ...

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Abstract

The invention discloses a flue gas desulfurization and denitration method and is intended mainly to solve the problem that a traditional oxidation absorption method is low in denitration efficiency or susceptible to SO2. The flue gas desulfurization and denitration method includes: for dedusted flue gas, pre-oxidizing with hydrogen peroxide solution, and desulfurizing and denitrating synchronously with a mixed solution of ethylenediamine cobalt and an alkaline slurry. The flue gas desulfurization and denitration method is high in desulfurization and denitration efficiency, small in floor area, low in investment cost and suitable for simultaneous denitration with desulfurization after modification based on an existing wet desulfurizing device.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a method for desulfurization and denitrification of flue gas. Background technique [0002] Sulfur dioxide and nitrogen oxides are important air pollutants that cause haze pollution. With the development of the economy, the total amount of sulfur dioxide and nitrogen oxides emitted by my country's industries has increased year by year. With the improvement of emission standards and the introduction and advancement of the country's ultra-clean emission requirements, thermal power and other industries are facing increasing pressure to reduce sulfur dioxide and nitrogen oxide emissions. Currently, separate desulfurization and denitrification technologies are diverse and relatively mature. In order to meet the discharge standards of various pollutants in the flue gas, various industrial enterprises need to build and operate desulfurization and denitrification devices at the sam...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/80B01D53/75B01D53/60B01D53/96
CPCB01D53/60B01D53/75B01D53/78B01D53/80B01D53/96B01D2251/102B01D2251/106B01D2251/2067B01D2251/404B01D2258/0283
Inventor 范维义
Owner HUATIAN ENG & TECH CORP MCC
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