WO2022011861A1 - 一种改善锅炉大角度弯道流场烟气均匀性的装置 - Google Patents

一种改善锅炉大角度弯道流场烟气均匀性的装置 Download PDF

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WO2022011861A1
WO2022011861A1 PCT/CN2020/121309 CN2020121309W WO2022011861A1 WO 2022011861 A1 WO2022011861 A1 WO 2022011861A1 CN 2020121309 W CN2020121309 W CN 2020121309W WO 2022011861 A1 WO2022011861 A1 WO 2022011861A1
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Prior art keywords
baffle
flue
angle
baffles
uniformity
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French (fr)
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钟犁
李芊
刘冠杰
肖平
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J11/00—Devices for conducting smoke or fumes, e.g. flues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F23J13/02—Linings; Jackets; Casings

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  • the invention belongs to the technical field of boilers, and relates to a device for improving the uniformity of flue gas in a large-angle bend flow field of a boiler.
  • the purpose of the present invention is to overcome the above shortcomings of the prior art, and to provide a device for improving the uniformity of the flue gas in the large-angle bend of the boiler, which can effectively improve the uniformity of the flue gas in the large-angle bend of the boiler.
  • the device for improving the flue gas uniformity of the large-angle bend of the boiler according to the present invention includes several y-shaped baffles, several obtuse-angle baffles and several arc-shaped baffles;
  • the large-angle bend of the boiler includes an inflow flue, a connecting flue and an outflow flue.
  • the inflow flue is connected to the inlet on the left side of the connection flue, and the outflow flue is connected to the outlet on the right side of the connection flue.
  • Each of the y-shaped baffles, the obtuse-angled baffles and the arc-shaped baffles are located in the connecting flue, and face the outflow flue.
  • the positions connecting the two corners of the bottom of the flue are respectively provided with a left chamfer and a right chamfer, and the side connecting the flue is provided with a side wall deflecting angle, wherein the side wall deflecting angle is located just above the right chamfer.
  • a folding flame angle is arranged at the inlet position connecting the flue.
  • the obtuse baffle is composed of two first baffles, wherein the ends of the two first baffles are separated, and the included angle between the two first baffles is greater than 90° and less than or equal to 185°.
  • the y-shaped baffle plate is composed of a second baffle plate, a third baffle plate and a fourth baffle plate, wherein the second baffle plate is located below the third baffle plate and the fourth baffle plate, and the second baffle plate is located below the third baffle plate and the fourth baffle plate.
  • the angle between the baffle and the third baffle is 90°-175°
  • the angle between the fourth baffle and the third baffle is greater than 0° and less than 85°
  • the second baffle The third baffle plate and the fourth baffle plate are separated from each other, and the length of the fourth baffle plate is smaller than that of the second baffle plate and the third baffle plate.
  • the arc baffle is composed of a fifth baffle alone, and the fifth baffle is an arc-shaped long plate with a central angle of 30-160°.
  • the first baffle, the second baffle, the third baffle, the fourth baffle and the fifth baffle are all provided with tube panels, wherein the tube panels are connected with a header, and the first baffle is A wear-resistant castable layer is arranged on the outer walls of the plate, the second baffle, the third baffle, the fourth baffle and the fifth baffle.
  • the outlet connecting the flue is divided into N equal points, and each equal point is provided with an obtuse baffle, a Y-shaped baffle or an arc baffle.
  • the side wall deflecting angle is provided on the boiler furnace wall, wherein the angle of the side wall deflecting angle is 90°-170°, and the position of the included angle of the side wall deflecting angle is a circular arc structure or a boss type structure.
  • an obtuse-angle baffle, a Y-shaped baffle, an arc baffle, and a side wall baffle are added in the connecting flue.
  • Angle, left chamfer, right chamfer and folded flame angle can significantly improve the flow field. It has the characteristics of high flow field uniformity, less particle deposition and less wall wear, which greatly increases the uniformity of the flue flow field and makes the outlet
  • the relative standard deviation of the normal phase velocity of the flow field is significantly reduced.
  • the situation of high temperature flue gas sticking to the wall is reduced, and the degree of wall wear is reduced.
  • the design of the chamfer and the Y-shaped baffle plate greatly reduces the dead zone area of the secondary flow in the connecting flue, which can effectively reduce particle deposition. And it has no influence on the structure and heating surface layout of the original inflow flue and outflow flue, which lays a foundation for the good heat transfer efficiency and service life of the boiler.
  • Fig. 1a is the structural representation of the present invention
  • Figure 1b is a side view of the present invention
  • Fig. 2 is the internal structure schematic diagram of the first baffle
  • Embodiment 3a is a schematic structural diagram of Embodiment 1;
  • Figure 3b is a side view of the first embodiment
  • Figure 4b is a side view of the first embodiment
  • FIG. 5 is a schematic structural diagram of the third embodiment.
  • 1 is the inflow flue
  • 2 is the connecting flue
  • 3 is the outflow flue
  • 4 is an obtuse baffle
  • 5 is an arc baffle
  • 6 is a y-shaped baffle
  • 7 is a left chamfer
  • 8 is the right chamfer
  • 9 is the side wall deflecting angle
  • 10 is the folding flame angle
  • 11 is the header
  • 12 is the tube panel
  • 13 is the wear-resistant castable layer.
  • the device for improving the flue gas uniformity of the boiler's large-angle bend flow field includes a plurality of y-shaped baffles 6, a plurality of obtuse-angle baffles 4 and a plurality of arc-shaped baffles.
  • Plate 5; the large-angle bend of the boiler includes an inflow flue 1, a connecting flue 2 and an outflow flue 3, the inflow flue 1 is connected with the inlet on the left side of the connecting flue 2, and the outflow flue 3 is connected with the connecting flue.
  • the outlet on the right side of 2 is connected, wherein, each y-shaped baffle 6, obtuse baffle 4 and arc baffle 5 are all located in the connecting flue 2, and are facing the outflow flue 3.
  • the positions connecting the bottom two corners of the flue 2 are respectively provided with a left chamfer 7 and a right chamfer 8, and the side connecting the flue 2 is provided with a side wall deflecting angle 9, wherein the side wall deflecting angle 9 is located at the right chamfer.
  • a folding flame angle 10 is provided at the inlet position connecting the flue 2.
  • the obtuse-angle baffle 4 is composed of two first baffles, wherein the ends of the two first baffles are separated, and the included angle between the two first baffles is greater than 90° and less than or equal to 185°
  • y-type baffle 6 consists of the second baffle, the third baffle and the fourth baffle, wherein the second baffle is located below the third baffle and the fourth baffle, and The angle between the second baffle and the third baffle is 90°-175°, the angle between the fourth baffle and the third baffle is greater than 0° and less than 85°, and the second baffle
  • the baffle, the third baffle and the fourth baffle are separated from each other, and the length of the fourth baffle is smaller than that of the second baffle and the third baffle.
  • the arc baffle 5 is composed of a fifth baffle alone, and the fifth baffle is an arc long plate with a central angle of 30-160°.
  • first baffle Inside the first baffle, the second baffle, the third baffle, the fourth baffle and the fifth baffle are tube panels 12, wherein the tube panels 12 are connected with the header 11, the first baffle A wear-resistant castable layer 13 is provided on the outer walls of the baffle, the second baffle, the third baffle, the fourth baffle and the fifth baffle.
  • the outlet connecting the flue 2 is divided into N equal points, and each equal point is provided with an obtuse baffle 4, an arc baffle 5 or a y-shaped baffle 6; 9 is provided with a boiler furnace wall, wherein the angle of the side wall deflecting angle 9 is 90°-170°, and the position of the included angle of the side wall deflecting angle 9 is a circular arc structure or a boss-type structure.
  • the connecting flue 2 is located at the bottom, and at the same time as an ash hopper, the connecting flue 2 is divided into three equal parts, and a set of obtuse-angled baffles 4 are arranged at the left third. , a set of y-shaped baffles 6 are arranged at the right third.
  • the width of the outflow flue 3 is defined as 100 units, then the obtuse-angle baffle 4 on the left is composed of two first baffles with a length of 20 units, and the angle between the two first baffles is set.
  • the length of the second baffle and the third baffle is 30 units, and the included angle is 160 degrees; the length of the fourth baffle is 10 units, which is 20° from the vertical direction. angle.
  • the left chamfer 7 is 25 units wide, and the included angle with the horizontal direction is 45°;
  • the right chamfer 8 is 25 units wide, and the included angle with the horizontal direction is 50° °.
  • a side wall deflecting angle 9 is set at the upper wall of the right chamfer 8. As a part of the boiler furnace wall, the angle between the two sides is 130°, the side wall deflecting angle 9 is 10 units long, and the tip is rounded. Arc structure, no folding flame angle 10 is provided.
  • this embodiment can reduce the relative standard deviation of the normal phase velocity of the outlet flow field by about 76%, greatly improve the uniformity of the flow field, and increase the flue resistance by only about 4%.
  • the connecting flue 2 is located at the top, the connecting flue 2 is divided into quarters, and a set of obtuse baffles 4 are arranged at the left quarter, and the middle half is Two sets of y-shaped baffles 6 are arranged at the first and right quarters.
  • the width of the outflow flue 3 is defined as 100 units, then the obtuse-angled baffle 4 on the left is composed of two first baffles with a length of 15 units.
  • the angle between the two first baffles are 160° and do not touch each other.
  • the length of the second baffle plate and the third baffle plate is 25 units, and the included angle is 170 degrees; the length of the fourth baffle plate is 10 units, and the included angle is 20° with the vertical direction.
  • a right chamfer 8 is added at the upper right corner of the connecting flue 2, with a width of 25 units and an included angle of 50° with the horizontal direction.
  • a side wall deflecting angle 9 is set at the lower wall of the right chamfer 8. As a part of the boiler furnace wall, the angle between the two sides is 130°, the side wall deflecting angle 9 is 10 units long, and the tip adopts a circular arc. structure.
  • a folding flame angle 10 is set at the inlet position connecting the flue 2, the angle between the two sides is 110°, the side length of the folding flame angle 10 is 20 units, and the left chamfer 7 is not provided.
  • this embodiment can reduce the relative standard deviation of the normal phase velocity of the outlet flow field by about 80%, greatly improve the uniformity of the flow field, and increase the flue resistance by only about 5%.
  • the connecting flue 2 is located at the bottom, and at the same time, as an ash hopper, the connecting flue 2 is divided into five equal parts, and a set of arc baffles 5 are arranged at each equal part, with a total of 4 sets Curved baffles.
  • the arc baffle 5 of the first group on the left is an arc-shaped long plate with a radius of 15 units and a central angle of 85 degrees
  • the arc of the second group on the left is an arc-shaped long plate with a radius of 15 units and a central angle of 85 degrees
  • the baffle 5 is an arc-shaped long plate with a radius of 22 units and a central angle of 90 degrees
  • the arc-shaped baffles 5 of the third group on the left are arc-shaped long plates with a radius of 27 units and a central angle of 85 degrees.
  • the arc baffle 5 of the fourth group on the left is an arc long plate with a radius of 35 units and a central angle of 90 degrees.
  • a side wall deflecting angle 9 is set at the upper wall of the right chamfer 8. As a part of the boiler furnace wall, the angle between the two sides is 130°, the side wall deflecting angle 9 is 10 units long, and the tip is rounded. Arc structure, no folding flame angle 10 is provided.
  • this embodiment can reduce the relative standard deviation of the normal phase velocity of the outlet flow field by about 87%, greatly improve the uniformity of the flow field, and increase the flue resistance by only about 3%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chimneys And Flues (AREA)
  • Incineration Of Waste (AREA)

Abstract

一种改善锅炉大角度弯道流场烟气均匀性的装置，包括若干y型折流板（6）、若干钝角折流板（4）及若干弧形折流板（5）；锅炉大角度弯道包括入流烟道（1）、连接烟道（2）及出流烟道（3），入流烟道（1）与连接烟道（2）左侧的入口相连通，出流烟道（3）与连接烟道（2）右侧的出口相连通，各y型折流板（6）、钝角折流板（4）及弧形折流板（5）均位于连接烟道（2）内，且正对出流烟道（3），该装置能够有效改善锅炉大角度弯道流场烟气的均匀性。

Description

一种改善锅炉大角度弯道流场烟气均匀性的装置 技术领域
本发明属于锅炉技术领域，涉及一种改善锅炉大角度弯道流场烟气均匀性的装置。
背景技术
在锅炉结构设计中，为方便受热面布置、优化传热效率，防止局部出现严重的超温、积灰或磨损，一般对烟气均匀性的要求较高。然而在锅炉结构设计中，难免存在大角度转弯烟道的结构形式，这种结构使得烟气在拐弯后存在着较大的速度梯度，导致截面上烟气均匀性较差，有时甚至会存在高温烟气贴壁的情况。这样的弯道结构在不加以优化的情况下不仅会引起严重的壁面磨损，而且无法进行合理的受热面布置，锅炉实际运行情况将与理论设计存在巨大偏差。
对于大角度弯道中的流场优化，一般采用密集的格栅板、导流板或布风板，可以取得较好的均流效果，但是由于材料用量巨大，而且无法耐受高温，因此仅用于锅炉低温部分，如一二次风、空预器后尾部烟气。在锅炉的高温部分，如炉膛出口，由于温度非常高，上述结构难以应用，因此一般采用加设折焰角的优化方法，但优化效果非常有限。因此，对于锅炉中的大角度弯道，尤其对于炉膛出口的高温部分，尚缺乏系统的同时考虑流场均匀性、粒子沉积性和工程可实施性的流场均匀性优化方法。
发明内容
本发明的目的在于克服上述现有技术的缺点，提供了一种改善锅炉大角度弯道流场烟气均匀性的装置，该装置能够有效改善锅炉大角度弯道流场烟气的均匀性。
为达到上述目的，本发明所述的改善锅炉大角度弯道流场烟气均匀性的装置包括若干y型折流板、若干钝角折流板及若干弧形折流板；
锅炉大角度弯道包括入流烟道、连接烟道及出流烟道，入流烟道与连接烟道左侧的入口相连通，出流烟道与连接烟道右侧的出口相连通，其中，各y型折流板、钝角折流板及弧形折流板均位于连接烟道内，且正对出流烟道。
连接烟道底部两角的位置处分别设置有左倒角及右倒角，连接烟道的侧面设置有边壁折流角，其中，边壁折流角位于右倒角的正上方。
连接烟道的入口位置处设置有折焰角。
钝角折流板由两块第一折流板组成，其中，两块第一折流板的端部分离，且两块第一折流板之间的夹角大于90°且小于等于185°。
y型折流板由第二折流板、第三折流板及第四折流板组成，其中，第二折流板位于第三折流板及第四折流板的下方，且第二折流板与第三折流板之间的夹角为90°-175°，第四折流板与第三折流板之间的夹角大于0°小于85°，且第二折流板、第三折流板及第四折流板相互分离，第四折流板的长度小于第二折流板及第三折流板。
弧形折流板由第五折流板单独组成，第五折流板为圆心角为30-160°的圆弧形长板。
第一折流板、第二折流板、第三折流板、第四折流板及第五折流板 的内部均设置有管屏，其中，管屏连接有集箱，第一折流板、第二折流板、第三折流板、第四折流板及第五折流板的外壁上均设置有耐磨浇注料层。
连接烟道的出口分为N个等分点，每个等分点处设置有一个钝角折流板、一个y型折流板或者一个弧形折流板。
边壁折流角设置有锅炉炉墙上，其中，边壁折流角的角度为90°-170°，且边壁折流角夹角的位置处为圆弧形结构或者凸台型结构。
本发明具有以下有益效果：
本发明所述的改善锅炉大角度弯道流场烟气均匀性的装置在具体操作时，在连接烟道内增设钝角折流板、y型折流板、弧形折流板、边壁折流角、左倒角、右倒角及折焰角，以显著改善流场，具有流场均匀性高、粒子沉积少、壁面磨损小的特点，大大增加了烟道流场的均匀性，使出口流场法相速度相对标准偏差显著降低。同时，消减了高温烟气贴壁的情形，减轻了壁面磨损的程度。另外，倒角和Y型折流板的设计大幅减小了连接烟道中二次流死区面积，可以有效地减少粒子沉积，结构简单，工程可实施性良好，对烟气阻力的影响小，并且对原有入流烟道和出流烟道的结构和受热面布置无影响，为锅炉良好的传热效率和使用寿命打下了基础。
附图说明
图1a为本发明的结构示意图；
图1b为本发明的侧视图；
图2为第一折流板的内部结构示意图；
图3a为实施例一的结构示意图；
图3b为实施例一的侧视图；
图4a为实施例二的结构示意图；
图4b为实施例一的侧视图；
图5为实施例三的结构示意图。
其中，1为入流烟道、2为连接烟道、3为出流烟道、4为钝角折流板、5为弧形折流板、6为y型折流板、7为左倒角、8为右倒角、9为边壁折流角、10为折焰角、11为集箱、12为管屏、13为耐磨浇注料层。
具体实施方式
下面结合附图对本发明做进一步详细描述：
参考图1a、图1b及图2，本发明所述的改善锅炉大角度弯道流场烟气均匀性的装置包括若干y型折流板6、若干钝角折流板4及若干弧形折流板5；锅炉大角度弯道包括入流烟道1、连接烟道2及出流烟道3，入流烟道1与连接烟道2左侧的入口相连通，出流烟道3与连接烟道2右侧的出口相连通，其中，各y型折流板6、钝角折流板4及弧形折流板5均位于连接烟道2内，且正对出流烟道3。
连接烟道2底部两角的位置处分别设置有左倒角7及右倒角8，连接烟道2的侧面设置有边壁折流角9，其中，边壁折流角9位于右倒角8的正上方；连接烟道2的入口位置处设置有折焰角10。
钝角折流板4由两块第一折流板组成，其中，两块第一折流板的端部分离，且两块第一折流板之间的夹角大于90°且小于等于185°；y型折流板6由第二折流板、第三折流板及第四折流板组成，其中，第二 折流板位于第三折流板及第四折流板的下方，且第二折流板与第三折流板之间的夹角为90°-175°，第四折流板与第三折流板之间的夹角大于0°小于85°，且第二折流板、第三折流板及第四折流板相互分离，第四折流板的长度小于第二折流板及第三折流板。弧形折流板5由第五折流板单独组成，第五折流板为圆心角为30-160°的圆弧形长板。
第一折流板、第二折流板、第三折流第四折流板及第五折流板的内部均设置有管屏12，其中，管屏12连接有集箱11，第一折流板、第二折流板、第三折流板、第四折流板及第五折流板的外壁上均设置有耐磨浇注料层13。
连接烟道2的出口分为N个等分点，每个等分点处设置有一个钝角折流板4、一个弧形折流板5或者一个y型折流板6；边壁折流角9设置有锅炉炉墙上，其中，边壁折流角9的角度为90°-170°，且边壁折流角9夹角的位置处为圆弧形结构或者凸台型结构。
实施例一
参考图3a及图3b，在本实施例中，连接烟道2位于底部，同时作为灰斗，将连接烟道2进行三等分，左侧三分之一处设置一组钝角折流板4，右侧三分之一处设一组y型折流板6。
将出流烟道3的宽度定义为100单位，则左侧的钝角折流板4由两块长度为20单位的第一折流板组成，两块第一折流板之间的夹角设为110°，并且互不接触，第二折流板及第三折流板的长度为30单位，夹角为160度；第四折流板的长度为10单位，与竖直方向成20°夹角。
在连接烟道2的底部两角处增设倒角，其中，左倒角7宽25单位， 与水平方向的夹角为45°；右倒角8宽25单位，与水平方向的夹角为50°。在右倒角8的上方壁面处设边壁折流角9，作为锅炉炉墙的一部分，两条边之间的角度为130°，边壁折流角9边长为10单位，尖端采用圆弧结构，未设置折焰角10。
经计算，本实施例可使出口流场法相速度相对标准偏差减小约76％，使流场均匀性大大提升，同时烟道阻力增加仅约4％。
实施例二
参考图4a及图4b，在本实施例中，连接烟道2位于顶部，将连接烟道2进行四等分，左侧四分之一处设置一组钝角折流板4，中间二分之一及右侧四分之一处设两组y型折流板6。
将出流烟道3的宽度定义为100单位，则左侧的钝角折流板4，由两块长度为15单位的第一折流板组成，两块第一折流板之间的夹角为160°，并且互不接触。第二折流板及第三折流板的长度为25单位，夹角为170度；第四折流板的长度为10单位，与竖直方向成20°夹角。
同时，在连接烟道2的右上角处增设右倒角8，宽25单位，与水平方向的夹角为50°。右倒角8的下方壁面处设边壁折流角9，作为锅炉炉墙的一部分，两条边之间的角度为130°，边壁折流角9边长为10单位，尖端采用圆弧结构。在连接烟道2的入口位置设折焰角10，两条边之间的角度为110°，折焰角10边长为20单位，未设置左倒角7。
经计算，本实施例可使出口流场法相速度相对标准偏差减小约80％，使流场均匀性大大提升，同时烟道阻力仅增加仅约5％。
实施例三
参考图5，在本实施例中，连接烟道2位于底部，同时作为灰斗，将连接烟道2进行五等分，在每等分处设置一组弧形折流板5，共4组弧形折流板。
将出流烟道3的宽度定义为100单位，则左侧第一组的弧形折流板5为半径为15单位，圆心角为85度的弧形长板，左侧第二组的弧形折流板5为半径为22单位，圆心角为90度的弧形长板，左侧第三组的弧形折流板5为半径为27单位，圆心角为85度的弧形长板，左侧第四组的弧形折流板5为半径为35单位，圆心角为90度的弧形长板。
在连接烟道2的底部两角处增设倒角，其中，左倒角7宽25单位，与水平方向的夹角为45°；右倒角8宽25单位，与水平方向的夹角为50°。在右倒角8的上方壁面处设边壁折流角9，作为锅炉炉墙的一部分，两条边之间的角度为130°，边壁折流角9边长为10单位，尖端采用圆弧结构，未设置折焰角10。
经计算，本实施例可使出口流场法相速度相对标准偏差减小约87％，使流场均匀性大大提升，同时烟道阻力增加仅约3％。

Claims (9)

  1. 一种改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，包括若干y型折流板(6)、若干钝角折流板(4)及若干弧形折流板(5)；
    锅炉大角度弯道包括入流烟道(1)、连接烟道(2)及出流烟道(3)，入流烟道(1)与连接烟道(2)左侧的入口相连通，出流烟道(3)与连接烟道(2)右侧的出口相连通，其中，各y型折流板(6)、钝角折流板(4)及弧形折流板(5)均位于连接烟道(2)内，且正对出流烟道(3)。
  2. 根据权利要求1所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，连接烟道(2)底部两角的位置处分别设置有左倒角(7)及右倒角(8)，连接烟道(2)的侧面设置有边壁折流角(9)，其中，边壁折流角(9)位于右倒角(8)的正上方。
  3. 根据权利要求1所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，连接烟道(2)的入口位置处设置有折焰角(10)。
  4. 根据权利要求1所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，钝角折流板(4)由两块第一折流板组成，其中，两块第一折流板的端部分离，且两块第一折流板之间的夹角大于等于90°且小于等于175°。
  5. 根据权利要求4所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，y型折流板(6)由第二折流板、第三折流板及第四折流板组成，其中，第二折流板位于第三折流板及第四折流板的下方，且第二折流板与第三折流板之间的夹角为90°-175°，第四折流板与第三折流板之间的夹角大于0°小于85°，且第二折流板、第三折流板及第四折流板相互分离，第四折流板的长度小于第二折流板及第三折流板。
  6. 根据权利要求5所述的改善锅炉大角度弯道流场烟气均匀性的装 置，其特征在于，弧形折流板(5)由第五折流板单独组成，第五折流板为圆心角为30-160°的圆弧形长板。
  7. 根据权利要求6所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，第一折流板、第二折流板、第三折流板、第四折流板及第五折流板的内部均设置有管屏(12)，其中，管屏(12)连接有集箱(11)，第一折流板、第二折流板、第三折流板及第四折流板的外壁上均设置有耐磨浇注料层(13)。
  8. 根据权利要求1所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，连接烟道(2)的出口分为N个等分点，每个等分点处设置有一个钝角折流板(4)、一个y型折流板(6)或者一个弧形折流板(5)。
  9. 根据权利要求2所述的改善锅炉大角度弯道流场烟气均匀性的装置，其特征在于，边壁折流角(9)设置有锅炉炉墙上，其中，边壁折流角(9)的角度为90°-170°，且边壁折流角(9)夹角的位置处为圆弧形结构或者凸台型结构。
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