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Boiler structure for vessel

A marine boiler and structural technology, applied in steam boilers, steam boiler accessories, water tube steam boilers, etc., can solve problems such as large corrosion, achieve the effects of reducing diversion, temperature uniformity, and reducing temperature imbalance

Active Publication Date: 2010-11-10
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the superheater 5, there is a problem that the higher the temperature is, the greater the corrosion is.

Method used

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  • Boiler structure for vessel
  • Boiler structure for vessel
  • Boiler structure for vessel

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0052] Such as figure 1 as well as Figure 2A As shown, in the marine boiler structure of this embodiment, the marine boiler 1A is configured so that the combustion gas generated by the combustion of the burner 3 flows from the furnace 2 through the superheater 5 and the evaporator tube group 6, and the furnace from the furnace 2 is provided. The bottom portion 2a supplies part of the combustion air as bottom air to the bottom air port 20 of the marine boiler 1A. The bottom air port 20 is located closer to the superheater 5 side than the center line CL of the burner 3, and the blowing direction of the bottom air blown from the bottom air port 20 is set from vertically upward to downward. The direction of the burner 3 is inclined by an angle range θ1.

[0053] And, the above-mentioned bottom air port 20 is connected to a bottom air duct 21 formed outside the furnace 2, through which air is supplied.

[0054] For example Figure 2A As shown, the number of bottom air ports 2...

no. 2 approach

[0064] based on image 3 , Fig. 4 illustrates the second embodiment of the marine boiler structure of the present invention. However, the same reference numerals are assigned to the same parts as those in the above-mentioned embodiment, and detailed description thereof will be omitted.

[0065] In this embodiment, with respect to the marine boiler 1B, the side air port 30 which supplies a part of combustion air from the upper part of the furnace 2 as side air is provided. This side air port 30 is provided inside the same wind box 3 a as the burner 3 .

[0066] The above-mentioned side air port 30 is provided closer to the superheater 5 side than the burner center line CL, and the blowing direction of the side air is set to be vertically downward toward the superheater 5 and the burner 3 . The angle range of the two-way tilt is adjustable within ±θ2. That is, θ2 at this time is preferably set to about 30 degrees, and therefore, the side air port 30 is desirably provided with...

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PUM

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Abstract

A boiler structure for vessel in which partial progress of corrosion is improved by making temperature distribution of combustion gas passing through a superheater uniform and the NOx level of combustion gas can be reduced. In the boiler structure for vessel configured such that the combustion gas generated through combustion of a burner (3) flows from a fire furnace (2) through a superheater (5) and an evaporation pipe group (6), a bottom air port (20) for supplying a part of combustion air from the bottom (2a) of the furnace (2) as bottom air is provided, the bottom air port (20) is located closer to the superheater (5) side than the center line (CL) of the burner, and a blow-off direction of bottom air is set in a range inclining from vertical upward to the direction of the burner.

Description

technical field [0001] The present invention relates to a marine boiler structure such as a marine boiler and a marine reheating boiler mounted on a ship. Background technique [0002] At present, since marine boilers mounted on ships are more restricted in installation space than land-use boilers used in power plants, etc., priority is given to a compact structure. [0003] exist Figure 5 In the shown existing marine boiler 1 , one or more burners 3 are arranged on the upper part of the furnace 2 . Combustion gas generated by burning fuel in the burner 3 passes through a front bank tube (front bank tube) 4, a superheater (superheater) 5, and an evaporator tube group (back bank tube) 6 arranged downstream of the furnace 2 in sequence, Heat exchange with fluid such as water flowing through the tube. The combustion gas thus heat-exchanged is discharged to the outside of the marine boiler 1 from the gas outlet 8 through the outlet-side gas duct 7 . In addition, reference nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C99/00F22B21/04F22B31/00F22B37/00F23L9/02F23L9/06
CPCF23C5/08F22B21/04F22B31/00F23L9/04F23C7/04F23C5/24F22B21/081F22B37/40F22G5/04F23L99/00
Inventor 今田润司内田勋
Owner MITSUBISHI HEAVY IND LTD