KR101783152B1 - Separated Over Fire Air System with Movable Blade - Google Patents

Abstract

The present invention relates to a SOFA system with a variable blade capable of moving to provide a flexible combustion adjustment solution to efficiently perform combustion in a combustion device of a generation plant. According to an embodiment of the present invention, the SOFA system for combustion in a combustion system includes an external duct and an internal duct. The internal duct includes at least one blades and sets left and right outlet angles of air by rotating about a first rotating shaft. The blades set the left and right outlet angles of air to be wider than the left and right outlet angles set by the internal duct by rotating about second rotating shafts that the blades have. The external duct surrounds a part of or the whole of the internal duct, has a circular shape, and sets upper and lower outlet angles of air by rotating about a third rotating shaft. The SOFA system with a variable blade can supply second air to a required position by applying a tilt angle and a yaw angle of a wide area, and can efficiently reduce unburned matter by efficiently combusting a relatively large amount of the non-combustion matter, which is not completely combusted in the main combustion area, and can solve a problem of reducing the heat transfer area due to ash slag.

Description

[0001] The present invention relates to an SOFA system having a variable blade,

The present invention relates to a SOFA (Separated Over Fire Air) system, and more particularly to a SOFA system having a movable blade to provide a flexible combustion adjustment solution that allows combustion in a power plant's combustion apparatus to be more efficient. .

One of the major problems in the combustion system of power plants is the problem of air pollution such as the emission of nitrogen oxides. The problem of such nitrogen oxides emission can be greatly reduced by the use of an over fire air system. That is, the overfire air system is a device that allows a part of the combustion air to flow into the upper end of the main combustion zone in the combustion system, reducing the amount of oxygen in the main combustion zone where nitrogen oxides (NOx) are generated, By injecting part of the secondary combustion air into the upper part of the zone, it is possible to perform the delayed combustion to complete combustion and to reduce the production of nitrogen oxides.

However, in the combustion system of the T-firing and tangential type, part of the particles move to the wall by the inertia force due to the circular flame and rise up along the wall surface or attached to the wall in the form of slag there is a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tilt angle and / or yaw angle range that can be varied over a wide range so as to burn a briquette rising upward along a wall surface and to prevent slagging of the non- To provide an SOFA system.

In order to accomplish the above object, a SOFA (Separated Over Fire Air) system for supporting combustion in a combustion system according to an embodiment of the present invention includes one or more blades capable of rotating about a first rotation axis, An inner duct which is rotatable about a rotary shaft and is capable of setting a left / right outflow angle of the air; a duct which surrounds part or all of the inner duct and has a rounded shape and rotates around a third rotary shaft, An outer duct to which the angle can be set, and a wind box surrounding the outer duct. In addition, the controller may further include a controller for controlling the left / right and top / bottom outflow angles of the air by controlling the rotation angles of the first to third rotation shafts.

In particular, the first rotary shaft is separately provided for each of the blades, and the controller controls the rotation angle of the first rotary shaft separately provided for each blade separately for each blade to control the left / right and upper / can do.

The secondary air can be supplied to the required position through the application of the tile angle and the yaw angle in the wide area proposed by the present invention, whereby the size of the unburned unburned fraction in the main combustion zone is comparatively small There is an effect that the problem of reducing the heat transfer area due to the reduction of the unburnt and the ash slag can be solved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a simplified configuration of a combustion system having an overfire air system. FIG.
FIG. 2 is a view showing the fuel injection angle in the main combustion zone 150. FIG.
3 is a view showing an example of the installation positions of the fuel injection system 110 and the SOFA system 130. As shown in FIG.
4 is a diagram showing an example of the SOFA system structure.
5 is a front view, a side view, and a top view of the SOFA system structure according to an embodiment of the present invention.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being "below" other portions are described as being "above " other portions. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a view showing a simplified configuration of a combustion system having an over fire air (OFA) system.

Referring to Figure 1, a combustion system 100 includes a fuel injection system 110 for injecting fuel and air to combust fuel in the main combustion zone 150, A close coupled over fire air (CCOFA) system 120 for injecting a part of the air 160 into the upper part of the main combustion zone 150 and a part of the combustion air 160 at the uppermost part of the burner, And a SOFA (Separated Over Fire Air) system.

As a part of the combustion air 160 is introduced into the combustion system by the CCOFA and / or SOFA, the amount of oxygen in the main combustion zone 150, in which nitrogen oxides are mainly produced, can be reduced, It is possible to suppress generation of nitrogen oxides by delayed combustion by injecting a part of the secondary combustion air into the upper part. The heat generated by the combustion in the combustion system can be used for power generation or the like by heating the water flowing through the pipe 140.

When the corner combustion type combustion system is composed of a wind box of the same structure having the fuel injection system 110, the CCOFA system 120, and the SOFA system 130 at each corner of the quadrangular combustion furnace, The air nozzles in the windbox can have a vertically arranged structure.

2 is a view showing the fuel and air injection angles in the main combustion zone 150. FIG.

Referring to FIG. 2, the fuel and air injected from the fuel injection system 110 included in the wind box configured at the four corners of the combustion system may be injected into the main combustion zone 150 at a certain angle 210. A circular spark is then formed in the main combustion zone 150 of the combustion system 110 where the fuel is burned. That is, the direction of the fuel and the air injected from the fuel injection system 110 may be the connection direction of the circular flame generated in the main combustion zone 150.

However, in the case where the fuel is combusted by the circular flame in the main combustion zone 150, particles of relatively large size, which are not combusted, have relatively inertia force, and the centrifugal force is applied to the combustion system 100 It can be rotated upward along the wall while showing a tendency to move toward the wall. Particles or completely burned particles in the main combustion zone 150 have an initial deformation temperature (IDT) determined according to the content of the ash, and a part thereof is fixed to the wall surface in the form of a slag The probability becomes high.

The SOFA system 130 may be provided to reduce the generation of complete combustion and the generation of harmful substances such as nitrogen oxides. Referring to FIG. 1, the SOFA system 130 may be provided at a top remote from the fuel injection system 110, and may be included in a single windbox, such as a fuel injection system. That is, the fuel injection system 110 may be provided at the lower end of the wind box installed at each corner of the combustion system 100, and the SOFA system 130 may be provided at an upper end of the fuel injection system 110 . The SOFA system 130 can change the air injection direction to assist combustion. Generally, the SOFA system 130 is operated at an angle of +30 degrees to +30 degrees in the upward / downward direction (tilt angle) and at +15 degrees in the lateral direction (yaw angle) An angle change of 15 degrees may be possible.

This small angle change can make it difficult to inject air into the wall surface by the SOFC system 130, thereby burning the unburned material that rises along the wall surface, or it may be difficult to treat the material that sticks to the wall in the form of slag .

3 is a view showing an example of a SOFA system structure provided in a wind box.

Referring to FIG. 3, the SOFA system 130 generally includes a rectangular structure 410 for introducing air into the combustion system 100, and the blades 420 of each structure are fixed. Control of the tilt angle and yaw angle of the SOFA system 130 may be accomplished by controlling the quadrilateral structure 410.

4 is a front view, a side view, and a top view of the SOFA system structure according to an embodiment of the present invention.

4, the SOFA system according to an embodiment of the present invention can be installed in a wind box 530 and includes an outer duct 520 and an inner duct 510 . The wind box 530 surrounds the outer duct 520 and the inner duct 510 may protrude partially from the front surface with respect to the outer duct 520 and the wind box 530. Further, the inner duct 510 is partitioned by the blades 540 and 541, and air can be supplied to the combustion system 100 through the space between the blades.

The inner duct 510 rotates about the rotary shaft 550 to adjust the yaw angle at which the air flows into the combustion system 100. The outer duct 520 rotates up and down about the rotary shaft 560 to adjust the tilt angle at which the air flows into the combustion system 100. In particular, the outer duct 520 is formed in a round shape so that the angle can be easily adjusted.

In addition, the blade of the present invention is not fixed but can be rotated about the rotating shafts 571 and 572. The yaw angle can be changed in a wider range by the rotation of the blades.

5 is a diagram illustrating a configuration for setting yaw angle and tilt angle of a SOFA system using a mechanical link according to an embodiment of the present invention.

Referring to FIG. 5, the rotation of the rotating shafts 550, 560, 571 and 572, which can change the yaw angle and tilt angle, can be constituted by a mechanical link. That is, the rotating shaft 550 of the inner duct, the rotating shaft 560 of the outer duct, and the rotating shafts 571 and 572 of the blades are connected to the remote controllers or mechanisms 650, 660, 671, and 672 by mechanical links, The desired yaw angle and tilt angle can be set by rotating the rotating shafts 550, 560, 571 and 572 by the operation of the mechanism devices 650, 660, 671,

The SOFA system according to the present invention has a round outer duct to facilitate the setting of the yaw angle and the tilt angle. The SOFA system has a yaw angle and a tilt angle that can be set using a non-stationary, To be extended widely. As a result, unburned components that are not completely burned in the main combustion zone can be efficiently burned with a relatively large size, thereby reducing unburned components and nitrogen oxides. In addition, The area reduction problem can be solved.

Especially, it is possible to provide a smoother combustion adjustment method and to meet the enhanced nitrogen oxide requirement through the application of the SOFA system proposed in the present invention at the time of reinforcing to enhance the output of a standard 500MW power plant in Korea.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

510: inner duct
520: outer duct
530: wind box
540, 541:
550: inner duct rotating shaft
560: outer duct rotating shaft
5771, 572:

Claims (5)

As a SOFA (Separated Over Fire Air) system for combustion in a combustion system,
An outer duct and an inner duct;
The inner duct
And has at least one blade, and can rotate about the first rotation axis to set the left / right outflow angle of air,
The one or more blades rotate about the second rotation axis of each blade to set the left / right outflow angle of air to be wider than the left / right outflow angle set by the inner duct,
The outer duct
A portion of or the whole of the inner duct is enclosed and has a round shape and can rotate around the third rotation axis to set the up / down outflow angle of the air
SOFA system.
The method according to claim 1,
Further comprising: a controller for controlling a rotation angle of the first to third rotation shafts to control left / right and up / down outflow angles of air,
SOFA system
3. The method of claim 2,
The second rotary shaft is provided separately for each blade,
The controller controls the rotation angles of the second rotation shaft separately for each blade separately for each blade to control the left / right and up / down outflow angles of the air
SOFA system. As a combustion system,
A fuel injection system for injecting fuel and air to combust fuel in the main combustion zone,
A closed coupled over fire air (CCOFA) system which is integrally coupled to the fuel injection system and injects a part of the combustion air into the upper part of the main combustion zone;
The SOFA system according to any one of claims 1 to 3, which is separately provided above the CCOFA and supplies a part of the combustion air to the top of the burner.
Combustion system.
As a power generation system,
A combustion system and piping,
The combustion system
A fuel injection system for injecting fuel and air to combust fuel in the main combustion zone,
A closed coupled over fire air (CCOFA) system which is integrally coupled to the fuel injection system and injects a part of the combustion air into the upper part of the main combustion zone;
The SOFA system according to any one of claims 1 to 3, separately provided above the CCOFA, and supplying a part of the combustion air to the top of the burner,
Wherein the heat generated by the combustion in the combustion system warms up the water flowing in the pipe,
Power generation system.

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