阅读说明：本技术 燃烧锅炉的风箱 (Wind box of combustion boiler ) 是由 何金龟 宁志 王清华 杜继臻 潘秀兰 李永胜 聊方伦 徐文亮 梅振锋 俞胜捷 于 2019-09-20 设计创作，主要内容包括：本发明公开一种燃烧锅炉的风箱,该燃烧锅炉的风箱包括：箱体,所述箱体开设有风箱进风口；多个燃烧器,多个所述燃烧器设置于所述箱体内,多个所述燃烧器的周向面上开设有外二次风进风口,其中,靠近所述风箱进风口的所述燃烧器为第一燃烧器；聚风部,所述聚风部设置于所述箱体内,且位于所述风箱进风口与所述第一燃烧器之间,所述聚风部为筒状结构,在第一方向上,所述聚风部的横截面面积逐渐减小,其中,所述风箱进风口指向所述第一燃烧器的方向为第一方向。该风箱缩小了第一燃烧器与其他燃烧器的外二次风风量偏差,有效的抑制了燃烧锅炉水冷壁高温腐蚀问题,提高了燃烧锅炉运行的安全性和可靠性。(The invention discloses a wind box of a combustion boiler, comprising: the air box comprises a box body, a first air inlet and a second air inlet, wherein the box body is provided with an air box air inlet; the plurality of burners are arranged in the box body, and outer secondary air inlets are formed in the circumferential surfaces of the plurality of burners, wherein the burners close to the air inlets of the air box are first burners; gather wind portion, gather wind portion set up in the box, and be located bellows air intake with between the first combustor, gather wind portion for tubular structure, in the first direction, the cross sectional area who gathers wind portion reduces gradually, wherein, the bellows air intake is directional the direction of first combustor is first direction. The air box reduces the air quantity deviation of the external secondary air of the first combustor and other combustors, effectively inhibits the high-temperature corrosion problem of the water wall of the combustion boiler, and improves the operation safety and reliability of the combustion boiler.)

1. A windbox of a combustion boiler, comprising:

the air box comprises a box body (100), wherein the box body (100) is provided with an air box air inlet (110);

the burners are arranged in the box body (100), the circumferential surfaces of the burners are provided with outer secondary air inlets (210), and the burners close to the air box inlets (110) are first burners (200);

gather wind portion (300), gather wind portion (300) set up in box (100), and be located bellows air intake (110) with between first combustor (200), gather wind portion (300) and be the tubular structure, in the first direction, the cross sectional area who gathers wind portion (300) reduces gradually, wherein, bellows air intake (110) point to the direction of first combustor (200) is first direction.

2. A wind box according to claim 1, characterized in that a plurality of flow deflectors (400) are provided at the wind inlet (110) of the wind box, and a plurality of the flow deflectors (400) are arranged at intervals in a second direction, which is perpendicular to the first direction.

3. A wind box according to claim 2, wherein at least one of the baffles (400) is of a circular arc configuration.

4. A wind box according to claim 3, wherein a plurality of said baffles (400) are of a circular arc configuration, and said box (100) comprises a top plate (120) and a bottom plate (130) which are disposed opposite to each other, and the arc degree of said plurality of said baffles (400) is gradually increased in a direction in which said top plate (120) is directed to said bottom plate (130).

5. A windbox according to claim 4, wherein the flow guiding surfaces (410) of the plurality of flow guiding plates (400) gradually increase in area in the direction in which the top plate (120) points towards the bottom plate (130).

6. A windbox according to claim 1, wherein the windgathering portion (300) comprises a first flat plate (310), a second flat plate (320), a third flat plate (330) and a fourth flat plate (340), which are connected in sequence to form a cylindrical structure, the first flat plate (310) is opposed to the third flat plate (330), the second flat plate (320) is opposed to the fourth flat plate (340), and in the first direction, a distance between the first flat plate (310) and the third flat plate (330) is gradually reduced, and a distance between the second flat plate (320) and the fourth flat plate (340) is gradually reduced.

7. A windbox according to claim 1, wherein the wind gathering portion (300) has a first end facing the windbox inlet (110), and a ratio between a height of the first end and a height of a circumferential face of the outer secondary wind inlet (210), which is a dimension in a direction perpendicular to the first direction, is 2 or more.

8. A windbox according to claim 7, wherein the ratio between the width of the first end and the width of the outer secondary air inlet (210), which is the dimension in the axial direction of the first burner (200), is 2 or more.

9. A wind box according to claim 1, wherein the wind gathering portion (300) has a second end facing the outer secondary wind intake opening (210), a ratio between a height of the second end and a height of a circumferential face of the outer secondary wind intake opening (210) being equal to 1, the height being a dimension in a direction perpendicular to the first direction.

10. A wind box according to claim 9, wherein the ratio between the width of the second end and the width of the outer secondary air intake (210), which is the dimension in the axial direction of the first burner (200), is equal to 1.

Technical Field

The invention relates to the technical field of combustion equipment, in particular to a wind box of a combustion boiler.

Background

When the combustion boiler is in operation, the primary air entering the hearth along with the fuel cannot make the fuel fully combusted, so secondary air needs to be conveyed to the combustion boiler to make the fuel fully combusted.

Conventional combustion boiler is provided with bellows, and the bellows air intake has been seted up, is provided with the multiunit combustor in the bellows, and every group combustor transversely arranges, has seted up outer overgrate air intake on the circumference face of combustor. The secondary air enters the air box and enters the hearth through an outer secondary air inlet on the combustor so as to enable the fuel to be fully combusted.

As the air speed is gradually reduced and the static pressure is gradually improved when secondary air flows in the air box, and the secondary air enters the inner cavity of the air box with larger space from the smaller air inlet of the air box, vortex flow is easily formed in the area near the junction, so that the air quantity of the external secondary air distributed by the burner close to the air inlet of the air box is less, the air quantity deviation of the external secondary air of the burner and other burners is overlarge, the high-temperature corrosion problem of the water-cooled wall of the combustion boiler is caused, and the operation safety and reliability of the combustion boiler are reduced.

Disclosure of Invention

The invention discloses an air box of a combustion boiler, which aims to improve the safety and the reliability of the operation of the combustion boiler.

In order to solve the problems, the invention adopts the following technical scheme:

a windbox of a combustion boiler, comprising:

the air box comprises a box body, a first air inlet and a second air inlet, wherein the box body is provided with an air box air inlet;

the plurality of burners are arranged in the box body, and outer secondary air inlets are formed in the circumferential surfaces of the plurality of burners, wherein the burners close to the air inlets of the air box are first burners;

gather wind portion, gather wind portion set up in the box, and be located bellows air intake with between the first combustor, gather wind portion for tubular structure, in the first direction, the cross sectional area who gathers wind portion reduces gradually, wherein, the bellows air intake is directional the direction of first combustor is first direction.

The technical scheme adopted by the invention can achieve the following beneficial effects:

in the air box disclosed by the invention, an air gathering part is arranged between the air inlet of the air box and the first combustor. And the cross section area of the wind gathering part is gradually reduced in the direction of the wind inlet of the wind box pointing to the first combustor. The structure can gather secondary air entering the box body, the external secondary air volume of the first combustor is increased, the external secondary air volume deviation of the first combustor and other combustors is reduced, the high-temperature corrosion problem of the water wall of the combustion boiler is effectively inhibited, and the safety and the reliability of the operation of the combustion boiler are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a wind box disclosed in an embodiment of the present invention;

fig. 2 is a schematic diagram of relative positions of the wind gathering portion and the first burner in the wind box according to the embodiment of the invention.

Description of reference numerals:

100-box body, 110-wind box air inlet, 120-top plate, 130-bottom plate, 200-first combustor, 210-outer secondary air inlet, 300-wind gathering part, 310-first flat plate, 320-second flat plate, 330-third flat plate, 340-fourth flat plate, 400-guide plate and 410-guide surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 2, an embodiment of the present invention discloses a wind box of a combustion boiler, which may specifically include a box body 100, a plurality of burners, and a wind gathering portion 300.

The case 100 is an integral body of a bellows, which has an inner cavity. An air box inlet 110 is formed in the box body 100, and secondary air enters the box body 100 through the air box inlet 110. The specific structure of the box 100 and the wind inlet 110 of the wind box may be set according to the structure of the combustion boiler under actual conditions, and therefore, the present disclosure is not limited thereto.

The arrangement of the burners is different according to the type of the combustion boiler. The burners are usually arranged in groups, each group being arranged laterally. The plurality of burners are disposed in the case 100, and an outer secondary air inlet 210 is formed in a circumferential surface of the plurality of burners, and secondary air entering the case 100 enters the burners through the outer secondary air inlet 210. Among the plurality of burners, the burner near the windbox inlet 110 is the first burner 200, and the first burner 200 may be one burner or two or more burners.

The wind collecting portion 300 is a cylindrical structure disposed in the case 100, and is located between the wind box inlet 110 and the first burner 200, and the cross-sectional area of the wind collecting portion 300 is gradually reduced in a first direction, in which a direction in which the wind box inlet 110 is directed toward the first burner 200 is the first direction. The wind gathering part 300 can gather the secondary wind entering the box 100, increase the external secondary wind amount of the first burner 200, and reduce the external secondary wind amount deviation of the first burner 200 and other burners, thereby effectively inhibiting the high-temperature corrosion problem of the water wall of the combustion boiler, and improving the safety and reliability of the operation of the combustion boiler. Specifically, the wind gathering portion 300 may be welded to the case 100, or may be connected to the case 100 or the first combustor 200 in other manners, which is not limited herein.

In an alternative embodiment, the wind gathering part 300 may include a first flat plate 310, a second flat plate 320, a third flat plate 330, and a fourth flat plate 340, which are connected in sequence to form a cylindrical structure, wherein the first flat plate 310 is opposite to the third flat plate 330, the second flat plate 320 is opposite to the fourth flat plate 340, and in the first direction, the distance between the first flat plate 310 and the third flat plate 330 is gradually decreased, and the distance between the second flat plate 320 and the fourth flat plate 340 is gradually decreased. At this time, the wind collecting portion 300 has a greater tendency to change in cross-sectional area in the first direction, and thus has a better wind collecting effect. Specifically, the four flat plates may be connected by welding. Of course, there are many ways of connecting these four plates, and this is only a preferred embodiment provided herein and is not intended to limit the specific structure of the present invention.

In an alternative embodiment, the wind gathering portion 300 has a first end facing the wind box inlet 110, and a ratio of a height of the first end to a height of a circumferential surface of the outer secondary wind inlet 210 is 2 or more, where the height of the first end and the height of the circumferential surface of the outer secondary wind inlet 210 are both dimensions in a direction perpendicular to the first direction. This configuration can improve the wind collecting effect of the wind collecting portion 300.

Specifically, the ratio of the width of the first end to the width of the outer secondary air inlet 210 is greater than or equal to 2, where the width of the first end and the width of the outer secondary air inlet 210 are both the axial dimension of the first burner 200. According to the scheme, the width of the first end can be properly increased, so that the first end is opened as much as possible, more external secondary air is guided into the first combustor 200, and the air gathering effect of the air gathering part 300 is improved.

In order to maximize the effect of the secondary air gathered by the air gathering portion 300 on the outer secondary air inlet 210, in an alternative embodiment, the air gathering portion 300 has a second end facing the outer secondary air inlet 210, a ratio between a height of the second end and a height of a circumferential surface of the outer secondary air inlet 210 is equal to 1, where the height of the second end and the height of the circumferential surface of the outer secondary air inlet 210 are both dimensions in a direction perpendicular to the first direction. That is, the outer secondary air flowing out from the second end can substantially and completely enter the outer secondary air inlet 210, so that the leakage flow of the outer secondary air is reduced, and the utilization rate of the outer secondary air is improved.

Further, the ratio of the width of the second end to the width of the outer secondary air inlet 210 is equal to 1, where the width of the first end and the width of the outer secondary air inlet 210 are both the axial dimension of the first burner 200. On the basis of the scheme, the scheme further improves the utilization rate of the external secondary air.

When secondary air enters the larger inner cavity of the box body 100 from the smaller air box air inlet 110, the flow velocity of each layer of the inner cavity of the box body 100 is uneven, the pressure difference of the box body 100 is larger, and the air quantity difference of the external secondary air distributed by a plurality of burners is larger. In an alternative embodiment, a plurality of baffles 400 are disposed at the wind inlet 110 of the wind box, and the plurality of baffles 400 are spaced in a second direction perpendicular to the first direction. The secondary air entering the box 100 is dispersed to each layer of the box 100 under the shunting action of the guide plate 400, so that the static pressure distribution uniformity in the box 100 is improved, and the deviation of the external secondary air volume of each combustor is reduced.

The plurality of baffles 400 may be provided as a plane plate installed obliquely, but the wind resistance of the plane plate is large. Thus, further, at least one of the plurality of baffles 400 is a circular arc structure. Compared with a flat plate, the wind resistance of the arc structure is smaller.

In an alternative embodiment, the plurality of baffles 400 are all arc structures. In a specific embodiment, the box 100 may include a top plate 120 and a bottom plate 130, which are oppositely disposed, and in a direction in which the top plate 120 points to the bottom plate 130, the radians of the plurality of baffles 400 are gradually increased, so that the area in which the baffles 400 can be divided is increased, the static pressure distribution in the box 100 can be more uniform, and the external secondary air volume deviation between the burners is further reduced.

Further, the flow guide surfaces 410 of the plurality of flow guide plates 400 gradually increase in area in a direction in which the top plate 120 is directed toward the bottom plate 130. When the radian of the baffle 400 is increased, the area of the flow guide surface 410 of the baffle 400 is increased, so that the flow guide effect of the baffle 400 is stronger, the secondary air in the box body 100 is more uniform, and the external secondary air volume of the first combustor 200 can be further improved. The number of the plurality of baffles 400 may be set according to the size of the air inlet 110 of the air box, and specifically, the number of the baffles 400 may be set to 3 to 5.

In the above embodiments of the present invention, the difference between the embodiments is mainly described, and different optimization features between the embodiments can be combined to form a better embodiment as long as they are not contradictory, and further description is omitted here in view of brevity of the text.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.