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NOx-reduced burning method and apparatus

A combustion method and combustion device technology, applied in the combustion method, burner, combustion type, etc., can solve the problems of increased heat loss, corrosion of machine components, and increased dew condensation, and achieve the effect of high industrial utilization value.

Inactive Publication Date: 2004-06-30
MIURA COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such enhancement of functions leads to an increase in heat loss and an increase in the amount of condensation, so there is a problem that the components of the machine are corroded due to condensation.

Method used

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  • NOx-reduced burning method and apparatus
  • NOx-reduced burning method and apparatus
  • NOx-reduced burning method and apparatus

Examples

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Embodiment

[0045] Hereinafter, an embodiment in which the combustion method and device for reducing NOx of the present invention are applied to a straight-through steam boiler as one of water tube boilers will be described with reference to the accompanying drawings. figure 1 is a longitudinal sectional view of a steam boiler to which an embodiment of the present invention is applied, figure 2 yes means figure 1 A partial cross-sectional enlargement, image 3 yes means figure 2 partial bottom view, Figure 4 shows the relationship between the NOx reduction characteristic and the water spray amount according to this example, Figure 5 shows the relationship between the NOx reduction characteristic and the water spray amount according to this example, Figure 6 Indicates the relationship between the bellows pressure characteristic and the water spray volume.

[0046] exist figure 1 Among them, the steam boiler 1 as the combustion device for reducing NOx in this embodiment is a boil...

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Abstract

Combustion method and apparatus for NOx reduction are capable of easily achieving NOx reduction to an exhaust NOx value of 30 ppm or under. The combustion method is to perform in combination a first NOx reduction step for suppressing generated NOx value to 60 ppm or under (at 0% O2 in exhaust gas, dry basis) by a low NOx burner, a second NOx reduction step for recirculating exhaust gas of the low NOx burner to a burning reaction zone formed by the low NOx burner, and a third NOx reduction step for adding water or steam to the burning reaction zone.

Description

technical field [0001] The present invention relates to a combustion method and device for reducing NOx in water tube boilers, reheaters of absorption refrigerating machines, and the like. Background technique [0002] Generally, as the principle of suppressing NOx generation, ① a method of suppressing the flame (combustion gas) temperature; ② a method of shortening the residence time of high-temperature combustion gas; ③ a method of reducing the oxygen partial pressure, etc. Therefore, there are various NOx reduction techniques employing these principles. For example, some people have proposed and implemented two-stage combustion method, rich-lean combustion method, exhaust gas recirculation combustion method, water addition combustion method, steam injection combustion method, flame cooling combustion method with water pipe group (water pipe group cooling combustion method), etc. [0003] However, people have proposed such a restriction to the small straight-through boile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C99/00F23C9/08F23D11/16F23L7/00F23N5/00
CPCY02E20/344F23C2202/50F23L7/002F23N5/006F23C2202/30F23N2037/22F23C9/08F23N2237/22F23D11/16
Inventor 茅原敏广馆野一博田洼升松成健司大久保恭铺
Owner MIURA COMPANY LIMITED
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