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Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility

A technology of boiler equipment and air port, which is applied in the field of air port for fuel combustion, can solve the problem that the balanced reduction of NOx concentration and CO concentration is not considered, and achieve the effect of reducing NOx concentration and CO concentration

Inactive Publication Date: 2006-07-26
BABCOCK HITACHI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, depending on the type of fuel, the concentration of carbon monoxide (hereinafter referred to as CO) in the combustion gas may increase. Needless to say, the above-mentioned Patent Document 1 does not consider reducing the CO concentration, let alone reducing the NOx concentration and the CO concentration in a balanced manner.

Method used

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  • Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility
  • Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility
  • Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0089] figure 2 is a cross-sectional view showing Embodiment 1 of the air port of the present invention ( Figure 4 A-A' section view), image 3 is a perspective view with a part omitted, Figure 4 It is a figure which shows the air port seen from inside a furnace. Figure 5 is a graph showing the flow velocity at the outlet of the air port. Figure 6 , 7 8 and 8 are schematic diagrams showing the relationship between the state of air flow in the furnace 23 and the incomplete combustion area (where there are many combustible gases).

[0090] The air port 100 is arranged in the bellows 103 . The air nozzle mechanism of the air port has the primary nozzle 1, the secondary nozzle 2 that ejects the air that swirls along the outer periphery of the primary nozzle as secondary air, and the air that flows from the outer side of the primary nozzle 1 to the center line of the air port. Tertiary nozzle 3 as tertiary air jet.

[0091] The primary nozzle 1, the secondary nozzle 2, a...

Embodiment 1-2

[0113] Fig. 9 is a sectional view showing Embodiment 1-2 of the air port 100 of the present invention.

[0114] The difference from Embodiment 1-1 is that a movable sleeve 15 movable in the axial direction by operating a handle 21 from the outside is provided between the outer periphery of the primary nozzle 1 and the inner periphery of the secondary nozzle 2 . Furthermore, a movable sleeve 16 movable integrally with the movable sleeve 15 is provided. That is, the movable sleeve has a two-layer structure.

[0115] The movable sleeves 15 , 16 are connected to each other by a connecting member 18 and are movable in the axial direction by guide rollers 17 . A movable sleeve 15 is guided and movable in the axial direction on the inner circumference of the secondary nozzle 2 , and on the one hand a movable sleeve 16 is guided and movable on the outer circumference of the primary nozzle 1 .

[0116] Since the movable sleeve 15 becomes a part of the wall of the secondary nozzle 2, ...

Embodiment 1-3

[0125] Fig. 12 is a sectional view showing Embodiment 1-3 of the air port of the present invention.

[0126] Although this example also has movable sleeves (movable nozzle: nozzle adjusting member) 15, 16, it is different from Embodiment 1-2 in the following points. In this example, among the conical front wall 301 and rear wall 302 constituting the tertiary nozzle 3 , the rear wall 302 can slide in the axial direction. The opening area of ​​the outlet 3A of the tertiary nozzle can be changed by sliding the rear wall 302 . In this example, the rear wall 302 is integrated with the movable sleeve 15 of the secondary nozzle 2 , and the rear wall 302 can also move simultaneously when the movable sleeve 15 is moved. The front wall 301 is fixedly supported in the bellows 13 .

[0127] Even in this embodiment, when the flow rate of the tertiary air 11 is reduced (including zero flow rate) and the flow rate of the secondary air is increased, the movable sleeve 15 is moved closer to ...

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Abstract

The boiler is provided with a burner (101) and an air port (100). The air port (100) is an air port for supplying an amount of air necessary for complete combustion to the incomplete combustion region below the theoretical air ratio formed by the burner (101) in the furnace (23). The air port (100) includes a nozzle mechanism for ejecting combustion air including an axial velocity component and a velocity component toward the center of the air flow, and a mechanism for changing the velocity component ratio. The nozzle mechanism consists of a primary nozzle (1) that ejects primary air that advances linearly in the axial direction of the air port, a secondary nozzle (2) that ejects secondary air accompanied by a swirling flow, and a secondary nozzle (2) that ejects the air from the outside of the primary nozzle. The flowing air is constituted as a tertiary nozzle (3) for ejecting tertiary air.

Description

technical field [0001] The invention relates to an air port for fuel combustion and a manufacturing method thereof, a boiler and boiler equipment, an operation method of the boiler equipment and a modification method thereof. Background technique [0002] In combustion furnaces such as boilers, it is necessary to reduce the concentration of nitrogen oxides (NOx) and reduce the unburned portion, etc., and in order to meet such requirements, the post-combustion method is used. [0003] In the combustion furnace, the burner is used to form an incomplete combustion area (area with more combustible gas) below the theoretical air ratio (theoretical fuel air amount). The secondary combustion method uses the air port (rear side) installed on the downstream side of the burner. Air port) A combustion method that supplies the necessary amount of air for complete combustion to the combustible gas in the above-mentioned incomplete combustion region. This combustion method suppresses the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L9/00
Inventor 山本研二冈崎洋文谷口正行安田和巳木山研滋矢野隆则马场彰越智健一折田久幸折井明仁上川由贵仓增公治
Owner BABCOCK HITACHI KK
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