JP2816096B2 - Boiler equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a boiler device.

[0002]

2. Description of the Related Art A burner is provided on one side of a boiler main body having upper and lower drums, and a group of water tubes for suppressing NOx generation communicating with the upper and lower drums is provided near the downstream side of the burner in the boiler main body. In addition to suppressing NOx generation, a heat collecting water pipe group communicating the upper and lower drums with a space therebetween is provided on the downstream side, and a space between the NOx generation suppressing water pipe group and the heat collecting water pipe group is provided. There is a boiler device in which a portion is formed as an adiabatic space for CO oxidation to promote oxidation of CO.

[0003]

In such a conventional boiler device, the internal pressure is applied to the upper and lower drum walls located in a space portion as an adiabatic space where no water tube group is provided, so that the strength is maintained. In order to do so, it was necessary to increase the thickness of the wall. In addition, since there is no factor that disturbs the gas flow in the space, the oxidation of CO is difficult to proceed sufficiently. An object of the present invention is to solve such a problem and to promote the oxidation reaction of CO in a space part as an adiabatic space, and to maintain the strength without increasing the thickness of a wall body. It is.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a burner is provided on one side of a boiler main body having a vertical drum, and a vertical burner is provided near a downstream side of the burner in the boiler main body. A water pipe group communicating with the drums is provided, and a water pipe group communicating the upper and lower drums is provided downstream of the water pipe group with a space as an adiabatic space, and the upper and lower drums are communicated with the space between these water pipe groups. The present invention proposes a boiler device in which a small number of water pipes are provided, and a vortex forming protrusion is formed in the small number of water pipes.

[0005]

The temperature of the flame formed in the burner is immediately lowered by a group of water tubes near the downstream side of the burner, and the generation of nitrogen oxides (NOx) is suppressed. After passing through the space, the combustion gas that has passed through the water pipes is collected and exhausted by the water pipes. The combustion gas is disturbed by a large number of small vortices formed on the downstream side by the bluff body effect of a small number of water tubes forming vortex forming protrusions in the space as an adiabatic space, and mixing is very good. As a result, combustion is promoted, and CO is oxidized well. The small number of water pipes that form a small vortex of combustion gas by the vortex forming projections are located in this space because they are configured to communicate with the upper and lower drums of the space as an adiabatic space where no water pipe group is provided. The upper and lower drum walls can be reinforced.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a boiler main body that forms a drum 7 above and below, and a burner 2 is provided on one side of the boiler main body 1. In the boiler main body 1, a water pipe group 3 communicating with the upper and lower drums 7 is provided near the downstream side of the burner 2, and the upper and lower drums 7 are separated by a space part 4 as an adiabatic space on the downstream side. A water pipe group 6 is provided for communication, and upper and lower drums 7 are provided in a space 4 between the water pipe group 3 and the water pipe group 6.
Is provided with a small number of water pipes 5. The water pipe 5 has a vortex forming projection 8.

In the above configuration, the temperature of the flame formed in the burner 2 is immediately lowered by the water pipe group 3 near the downstream side of the burner 2 to reduce the temperature of the nitrogen oxide (NO).
x) is suppressed. The water pipe group 3 is designed so that the temperature of the combustion gas in the space portion 4 as the heat insulating space on the downstream side is, for example, 1000 ° C. or more and 1500 ° C. or less. The combustion gas that has passed through the water pipe group 3 has a size that ensures a residence time necessary for oxidation of CO in the combustion gas, for example, a size such that the passage time of the combustion gas is about 0.01 second. After the CO enters the space 4 where the CO is oxidized by passing through the space 4, the water is collected and exhausted in the water tube group 6. A small number of water pipes 5 are installed in the space section 4 as an adiabatic space, and the vortex forming projections 8 are formed in the water pipes 5. The turbulence is caused by a large number of small vortices 9 formed downstream of the turbulence, so that the mixing is very good, the combustion is promoted, and the CO is oxidized well. The small number of water pipes 5 installed in the space 4 in this way has the effect of accelerating the oxidation reaction of CO, but at the same time, the upper and lower walls of the upper and lower drums 7 located in the space 4 where the water pipe group is not provided. Since it also serves as reinforcement of the body, an unexpected situation caused by the internal pressure of the drum 7 can be avoided.

[0008]

As described above, according to the present invention, a small number of CO oxidation accelerating units having a vortex-forming projection formed in a space as an adiabatic space formed between a water tube group for suppressing NOx generation and a water tube group for heat collection. By installing the water pipe for reinforcement, the upper and lower drums can be reinforced simultaneously with the promotion of oxidation.
That is, the combustion gas is remarkably promoted by a large number of small eddies formed in the space as an adiabatic space, so that oxidation of CO is remarkably promoted. The size can be made smaller than before, and as a result, the boiler device itself can be downsized, and at the same time, the wall of the drum located in the space can be reinforced, and the The present invention has excellent effects such as being able to prevent an unexpected situation due to an increase in the internal pressure.

[Brief description of the drawings]

FIG. 1 is a partial vertical cross-sectional explanatory view of a boiler device of the present invention.

FIG. 2 is a partial cross-sectional explanatory view of the boiler device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Burner 3 Water pipe group (for NOx generation suppression) 4 Space part (CO heat insulating space) 5 Water pipe (for CO oxidation promotion and reinforcement) 6 Water pipe group (for heat collection) 7 Upper and lower drum 8 Vortex formation Projection 9 Small eddy current

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F22B 31/00

Claims (1)

(57) [Claims] 1. A boiler main body having a vertically arranged drum.
A burner is installed on the side, and the burner is
When water pipe groups communicating the upper and lower drums are provided near the downstream side
Both are separated by a space as a heat insulating space on the downstream side.
A water pipe group that communicates with the lower drum is provided, and between these water pipe groups
A small number of water pipes connecting the upper and lower drums
That the vortex-forming projections were formed on this small number of water pipes.
Characteristic boiler equipment