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Method of combustion and combustion apparatus

A combustion method and combustion device technology, which are applied in the combustion method, combustion type, combustion control and other directions, can solve problems such as difficulty in application, and achieve the effects of easy combustion control, simple adjustment, and easy adjustment

Active Publication Date: 2009-08-19
MIURA COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 that the combustion must be carried out in an excess fuel concentration state.

Method used

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  • Method of combustion and combustion apparatus
  • Method of combustion and combustion apparatus

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0175] The present invention includes Embodiment 1 of the combustion device described below. Embodiment 1 of this combustion device is a combustion device that includes: a burner that combusts a fuel containing hydrocarbons to generate a gas that does not contain hydrocarbons but contains oxygen, nitrogen oxides, and carbon monoxide; Heat-absorbing equipment for absorbing heat in the gas; an oxidation catalyst for oxidizing carbon monoxide contained in the above-mentioned gas passing through the heat-absorbing equipment with oxygen, and reducing nitrogen oxides with carbon monoxide; a sensor for detecting the air ratio of the above-mentioned burner; and an air ratio adjusting device for controlling the burner to set an air ratio based on a detection signal from the sensor, wherein the burner and the heat absorbing device are configured as follows, and when the air ratio adjusting device is used to set When the above-mentioned air ratio is adjusted to the above-mentioned set ai...

Embodiment approach 2

[0196] The present invention includes Embodiment 2 of the following combustion device. The combustion device has a burner that burns a fuel containing hydrocarbons to generate a gas that does not contain hydrocarbons but contains oxygen, nitrogen oxides, and carbon monoxide; a heat-absorbing device that absorbs heat from the gas generated by the burner; Carbon monoxide contained in the above-mentioned gas after passing through the heat-absorbing device, a catalyst for reducing nitrogen oxides by carbon monoxide; and an air ratio adjusting device for adjusting the air ratio of the above-mentioned burner, wherein the above-mentioned burner and the above-mentioned heat-absorbing device have Air ratio-NOx on the primary side of the catalyst related to the gas containing oxygen, nitrogen oxides, and carbon monoxide on the primary side of the catalyst obtained by adjusting the air ratio to around 1.0 with the air ratio adjusting device · CO characteristics (primary characteristics),...

Embodiment approach 2

[0200] (Scheme 2 of Embodiment 2)

[0201] This means 2 is characterized in that the set air ratio is set to a value such that the NOx concentration in the secondary characteristic is substantially greater than zero and lower than the NOx concentration in the primary characteristic. The above-mentioned value can be realized by setting the above-mentioned set air ratio to an air ratio in the NOx·CO reduction region of the above-mentioned secondary characteristic substantially larger than 1.0. This solution 2 can realize the above adjustment 2.

[0202] In this aspect 2, since the above-mentioned set air ratio is greater than the air ratio of 1.0, oxygen exists on the secondary side of the above-mentioned catalyst. In this case, since the oxidation reaction dominates the reduction reaction in the catalyst, the exhausted NOx concentration decreases to a value lower than the NOx concentration of the primary characteristic, but not zero, and exists on the secondary side of the cat...

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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 of combustion 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 endothermic step of absorbing heat from the gas produced by the combustion step by endothermic means; the hazardous substance reducing step of bringing the gas after the endothermic step 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 by the use of air ratio regulation means of burner on the basis of concentration ratio characteristic of the burner and endothermic means.

Description

technical field [0001] The present invention relates to a combustion method and a combustion device applied to a water tube boiler, a regenerator of an absorption refrigerator, and the like. Background technique [0002] In general, as the mechanism for suppressing the generation of NOx, suppression of flame (combustion gas) temperature, shortening of residence time of high-temperature combustion gas, and the like are known. Then, there are various NOx reduction technologies that apply these principles. For example, the two-stage combustion method, the rich combustion method, the exhaust gas recirculation combustion method, the water addition combustion method, the steam injection combustion method, the flame cooling combustion method using a water tube group, etc., have been proposed and put into practical use. [0003] However, concerns about the impact on the environment are increasing even for small-capacity NOx generating sources such as water tube boilers, and further...

Claims

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Application Information

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