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Method of treating gas containing nitrogen oxide

A technology of nitrogen oxides and treatment methods, which is applied in the direction of chemical instruments and methods, combustion methods, separation methods, etc., can solve problems such as difficulty in application, and achieve the effects of easy combustion control and significant reduction of harmful substances

Active Publication Date: 2009-04-22
MIURA COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent document 7, it is difficult to apply to a combustion device such as a boiler using a burner that contains oxygen in the exhaust gas due to the restriction of combustion that makes the concentration of combustion excessive.

Method used

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  • Method of treating gas containing nitrogen oxide
  • Method of treating gas containing nitrogen oxide
  • Method of treating gas containing nitrogen oxide

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0094] A combustion device such as a boiler to which an embodiment of the method for treating nitrogen oxide-containing gas according to the present invention is typically provided as a main part: a burner; The tank body of the (water pipe) group; an oxidation catalyst that oxidizes carbon monoxide and simultaneously reduces nitrogen oxides through contact with and passage of gases containing oxygen, nitrogen oxides, and carbon monoxide that have passed through the above-mentioned heat transfer pipe group at a predetermined concentration ratio; fuel supply means for supplying gaseous fuel to the above-mentioned burner; combustion air supply means for premixing combustion gas and fuel while supplying combustion air to the above-mentioned burner; downstream of the above-mentioned oxidation catalyst, a sensor for detecting oxygen concentration; input Signals from the sensor and the like, and a controller that controls the fuel supply device, the combustion air supply device, and t...

Embodiment approach 2

[0097] Embodiment 1 of the present invention can be expressed using Embodiment 2 below. Embodiment 2 of the present invention is a method for treating nitrogen oxide-containing gas in which nitrogen oxides contained in the gas are brought into contact with an oxidation catalyst to reduce nitrogen oxides contained in the gas generated by burning fuel with a burner, and is characterized by comprising the following steps: Combustion of hydrocarbon-containing fuel using the above-mentioned burner to produce a gas containing no hydrocarbon, oxygen, nitrogen oxides and carbon monoxide; bringing the above-mentioned gas into contact with an oxidation catalyst, and using oxygen to convert the gas contained in the above-mentioned gas carbon monoxide oxidation, reduction of harmful substances using carbon monoxide to reduce nitrogen oxides; a concentration ratio adjustment step of adjusting the concentration ratio K of oxygen, nitrogen oxides, and carbon monoxide in the gas on the primary...

Embodiment 1

[0150] Next, an embodiment in which the combustion apparatus of the present invention is applied to a steam boiler will be described with reference to the drawings. figure 1 It is a schematic diagram of the longitudinal section of the steam boiler of the present embodiment 1, figure 2 for along figure 1 Sectional view of line II-II, image 3 Indicates that viewed from the direction of exhaust flow figure 2 Diagram of the composition of the main parts of the oxidation catalyst, Figure 4 It is a graph showing the air ratio-NOx·CO characteristic of Example 1, Figure 5 It is a schematic diagram of a part of the section of the use state of the damper position adjusting device of the same embodiment 1, Image 6 It is a schematic diagram of a part of the section of the damper position adjustment device in use, Figure 7 A schematic diagram for explaining the characteristics of the burner and the heat absorbing device and the characteristics of the catalyst of the present e...

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Abstract

It is intended first to reduce the amount of nitrogen oxide emission next to zero and reduce the amount of carbon monoxide emission to tolerance levels; second to realize energy saving by combustion at a low air ratio close to 1.0; and third to stably carry out the control of air ratio within the combustion region at a low air ratio.; The method is characterized by including the combustion step of combusting a hydrocarbon-containing fuel by a burner to thereby produce a gas containing oxygen, nitrogen oxide and carbon monoxide but not containing hydrocarbons; the hazardous substance reducing step of bringing the gas into contact with an oxidation catalyst to thereby attain oxidization by oxygen of carbon monoxide contained in the gas and reduction by carbon monoxide of nitrogen oxide contained therein; ; and the concentration ratio regulation step of regulating the concentration ratio of oxygen, nitrogen oxide and carbon monoxide in the gas on the primary side of the oxidation catalyst to a given concentration ratio wherein on the secondary side of the oxidation catalyst the concentration of nitrogen oxide is substantially zero or a given value or below and the concentration of carbon monoxide is also substantially zero or a given value or below.

Description

technical field [0001] The present invention relates to a treatment method for nitrogen oxide-containing gas suitable for water tube boilers, regenerators of absorption refrigerators, and the like. Background technique [0002] In general, as the principle of suppressing the generation of NOx, suppressing the temperature of the flame (combustion gas), shortening the residence time of the high-temperature combustion gas, and the like are known. Furthermore, there are various NOx reduction technologies that apply these principles. For example, the two-stage combustion method, the rich-lean combustion method, the exhaust gas recirculation combustion method, the hydrogenation combustion method, the steam injection combustion method, and the flame-cooled combustion method using water pipe groups have been proposed and put into practical use. [0003] In addition, small NOx generation sources such as water tube boilers also have an increased impact on the environment, and further...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C99/00F23C13/00B01D53/94F23N1/02F23N5/00
CPCF23N2035/06F23N2035/12F23N2035/10F23N1/022F23N2041/04F23N5/006F23J2219/10F23N2235/06F23N2235/10F23N2235/12F23N2241/04
Inventor 田中收德永幸博冈本裕介安井贤志
Owner MIURA COMPANY LIMITED