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Method for denitrifying flue gas by using amino reducing agent with high reaction activity

A reducing agent and active technology, applied in the field of flue gas denitrification, can solve the problems of high reaction energy consumption, high catalyst input cost, and difficult regeneration.

Inactive Publication Date: 2012-07-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of high catalyst input cost, difficult regeneration, and high operating costs in the selective catalytic reduction (SCR) technology, as well as the energy consumption of the aqueous solution of the reducing agent (ammonia and urea) in the selective non-catalytic reduction (SNCR) technology High, inaccurate reaction temperature field, and low efficiency of reducing agent utilization, the present invention provides a method for flue gas denitrification using highly reactive amino reducing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Flue gas denitrification in thermal power plants, NO X About 500ppmv.

[0040] NO in flue gas of thermal power plant X The main component is NO, accounting for about X More than 95% of the rest is NO 2 .

[0041] Add 34.5g of cyanuric acid into the reactor, control the temperature at about 350°C, and heat to produce active ammonia reducing agent cyanic acid and isocyanic acid, which are injected into the grid and mixed with NO X The flue gas is fully mixed into the denitrification reaction zone, and the NO X The molar ratio of the reaction is 0.8:1. After the reaction is carried out at a temperature of about 550° C. for 1 second, the reaction effluent enters the nitrogen oxide analyzer. Analysis of NO in flue gas before and after purification X Concentration, the removal rate of nitrogen oxides reaches 86%.

Embodiment 2

[0043] As described in Example 1, the difference is:

[0044] (1) Pre-decomposition of raw materials: 48g of urea is heated and decomposed into cyanuric acid and ammonia at 250°C;

[0045] (2) Gained cyanuric acid is carried out flue gas denitrification by the method for embodiment 1 again as the raw material of active amino reducing agent. Analysis of NO in flue gas before and after purification X Concentration, the removal rate of nitrogen oxides reaches 86%.

[0046] The ammonia gas in step (1) is used at 350°C for catalytic reduction and denitrification in the SCR system.

Embodiment 3

[0048] As described in Example 1, the difference is: 18.6g of methylamine is added to the reactor, the temperature is controlled at about 100°C, and the active ammonia reducing agent gaseous methylamine produced by heating is combined with NO X The molar ratio of the reaction is 0.6:1, and the reaction temperature is maintained at 540-580 ° C. After the reaction stays for 1 second, the reaction effluent enters the nitrogen oxide analyzer. NO in flue gas before and after purification X Concentration analysis shows that the removal rate of nitrogen oxides reaches 75%.

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Abstract

The invention relates to a method for denitrifying flue gas by using an amino reducing agent with high reaction activity. The method comprises the following steps of: spraying the amino reducing agent NR3 with high reaction activity into a denitrification reaction zone to ensure that the amino reducing agent and the flue gas are fully mixed, and reacting the amino reducing agent and NOX in the flue gas at the temperature of 350 - 800 DEG C to fulfill the aim of removing the NOX, wherein the denitrification efficiency can reach 70 to 90 percent. By the technology for denitrifying the flue gas by using the active amino reducing agent NR3, the disadvantages of a selective catalytic reduction (SCR) denitrification technology and a selective non-catalytic reduction (SNCR) denitrification technology are overcome, the reaction temperature is moderate, and the reaction selectivity is high. The method is applicable to the flue gas denitrification of multiple kinds of industrial boilers and industrial kilns and the treatment of automobile exhaust.

Description

technical field [0001] The invention relates to a method for denitrating flue gas by using a high-reactivity amino reducing agent, and belongs to the technical field of flue gas denitrification. technical background [0002] With the development of our country's economy, the environmental pollution caused by a large amount of energy consumption is becoming more and more serious. my country is a country where coal is the main energy source. Harmful substances such as soot, sulfur dioxide, and nitrogen oxides contained in coal-burning flue gas have caused serious air pollution. At present, my country has carried out large-scale flue gas desulfurization and achieved good results; but flue gas denitrification has not yet been carried out on a large scale. During the "Twelfth Five-Year Plan" period, the state will increase the control of nitrogen oxide emissions, and flue gas denitrification is imperative. [0003] Currently, flue gas denitrification technologies mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/56
Inventor 朱维群王倩宋名秀阿不都拉江・那斯尔刘晓明孙洪志
Owner SHANDONG UNIV
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