Medium or small-sized boiler exhaust gas plasma de-nitrating method

A technology of plasma and boiler exhaust gas, which is applied in the field of plasma denitrification to achieve high safety, high denitrification efficiency, and the effect of eliminating hidden dangers of explosion

Active Publication Date: 2015-05-06
水木清研生态环保(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a large number of small and medium-sized boilers in China, there is always a lack of an efficient and low-cost exhaust gas treatment method

Method used

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  • Medium or small-sized boiler exhaust gas plasma de-nitrating method
  • Medium or small-sized boiler exhaust gas plasma de-nitrating method
  • Medium or small-sized boiler exhaust gas plasma de-nitrating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 A plasma denitration method for waste gas from small and medium-sized boilers

[0041] The exhaust gas discharged from the boiler contains NO, which is mixed with reducing gas by a static mixer, and the above-mentioned mixed gas is brought into the electrode zone or the reaction zone behind the electrode zone in the plasma reaction vessel. In this zone, the NO in the exhaust gas is Reducing gas is reduced to N 2 And CO 2 And water and other harmless gases. The reducing gas can undergo a reduction reaction with NO under the action of plasma, and is preferably one of hydrogen, chlorine, carbon monoxide, hydrogen sulfide, methane, sulfur dioxide, ozone, propylene, ethylene, hydrogen bromide or hydrogen iodide. One or more mixed gases.

Embodiment 2

[0043] The exhaust gas discharged from the boiler is cooled and dust removed, so that the temperature of the exhaust gas is lower than 80°C, and then the above exhaust gas is mixed with the reducing gas and brought into the electrode zone in the plasma reaction vessel or the reaction zone behind the electrode zone. In this area, NO in exhaust gas is reduced to N 2 And CO 2 And water and other harmless gases. The NOx removal efficiency can be further improved by controlling the addition ratio of the exhaust gas and the reducing gas, and it is preferable that the ratio of the number of molecules of the reducing gas to NO is 1:2-5.

Embodiment 3

[0045] The exhaust gas discharged from the boiler contains NO, which is mixed with reducing gas by a static mixer, and the above-mentioned mixed gas is brought into the electrode zone or the reaction zone behind the electrode zone in the plasma reaction vessel. In this zone, the NO in the exhaust gas is Reduce to N 2 And CO 2 And water and other harmless gases. The said plasma reaction vessel uses the principle of dielectric barrier discharge. Under the action of high-energy electrons, charged particles are formed or the chemical bonds between molecules are broken to generate active particles such as free radicals. The entire discharge is composed of many randomly distributed in space and time. The micro-discharge composition of the micro-discharge, the duration of these micro-discharges is very short, generally on the order of 10ns. The dielectric layer has two main functions for this type of discharge: one is to limit the movement of charged particles in the microdischarge, s...

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Abstract

The invention discloses a medium or small-sized boiler exhaust gas plasma de-nitrating method. The method comprises the following steps: adding the exhaust gas containing NO and reducing gases into a plasma reactor simultaneously and de-nitrating by a reducing method. The method is characterized by capability of processing nitrogen oxide in boiler exhaust gases under normal temperature, high de-nitrating efficiency, simplicity in operation, low operation cost and wide application range. According to the method, the de-nitrating efficiency is high, that de-nitrating rate can be higher than 90% under graded control of plasma, the operation cost is low, the reaction can be completed at low temperature, and an additional heating system is not needed.

Description

Technical field [0001] The invention belongs to the field of industrial waste gas treatment, and particularly relates to a plasma denitration method for medium and small boiler waste gas. Background technique [0002] The problem of industrial waste gas treatment has always been the main issue to be solved by the environmental protection department. With the development of my country's national economy, energy utilization has increased year by year, and dust and emissions have also shown an upward trend year by year. As of the end of 2012, there were 620,300 boilers in use in my country, of which more than 70% were small and medium-sized boilers. Small and medium-sized boilers have a large volume and a wide area, and low chimneys have a great impact on air pollution. Therefore, in order to prevent and control air pollution, protect and improve the living environment and ecological environment, save energy, research and develop new exhaust gas purification devices, and control t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/79B01D53/56
CPCB01D53/56B01D53/76B01D53/79
Inventor 李瑞莲
Owner 水木清研生态环保(山东)有限公司
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