Horizontal rigid beam corner connecting device of four-corner tangential combustion supercritical boiler

Abstract

The utility model discloses a corner connecting device for horizontal rigid beams of a corner tangential combustion supercritical boiler. The corner connecting device comprises more than two layers of horizontal rigid beams and a water wall tube panel, the length of at least two layers of horizontal rigid beams covers the width of the furnace wall on the corresponding side, corner bent plates are arranged at the corner cut positions of the four furnace walls corresponding to the two layers of horizontal rigid beams, the two outer side faces of each corner bent plate are each fixedly connected with two connecting plates, and each connecting plate is connected with the corresponding horizontal rigid beam through a corresponding double-layer hinge. The corner bent plates are fixedly connected with a plurality of finger-shaped plates, the finger-shaped plates are fixedly connected with the water-cooled wall tube panel, the corner bent plates and the water-cooled wall tube panel at the corner cutting position of the furnace wall are fixedly connected with two layers of attachment plates, and the two trapezoidal plates are connected with the attachment plates on the respective layers in a lap joint mode; according to the utility model, self-balance of internal force of the horizontal rigid beam and normal expansion sliding of the corner connecting device can be realized, damage caused by deformation can be prevented, meanwhile, the installation problem of a burner is solved, and a guarantee is provided for normal and safe operation of a boiler.

Description

Technical Field

[0001] The utility model relates to a horizontal rigid beam corner connection device for a four-corner tangential combustion supercritical boiler. Background Art

[0002] The water-cooled wall tube panel in the burner area of ​​conventional 350MW and above supercritical boilers is an inclined spiral rising membrane wall, the combustion method is front and rear wall counter combustion, the furnace cross-section structure is rectangular, and the corner connection form of the spiral section rigid beam has formed a mature technology; but at present, many small-capacity supercritical four-corner tangential combustion boilers are also popular with users, which means that the water-cooled wall tube panel in the burner area is required to be an inclined spiral rising type, and the furnace cross-section is a tangent form instead of a conventional rectangle. The rigid beams that balance the furnace pressure are as follows Figure 1 , Figure 2 As shown, it includes an upper rigid beam 21 and a lower rigid beam 22 arranged on the front and rear walls and the two side walls. The upper rigid beam 21 is arranged in the vertical water-cooled wall area, and the lower rigid beam 22 is arranged in the spiral water-cooled wall area, which is also called the burner area rigid beam. It is a grid-type arrangement form. The upper rigid beam 21 includes several horizontal rigid beams, and the lower rigid beam 22 includes several connected vertical rigid beams 23 and several layers of horizontal rigid beams 24. The vertical rigid beam 23 is connected to the vertical lap plate 26 through a small joint 25, and the vertical lap plate 26 is in contact with the water-cooled wall tube panel 27 inside the furnace. When working, the furnace pressure is transmitted to the vertical rigid beam 23 through the small joint 25 on the vertical lap plate 26, and then transmitted to the horizontal rigid beam 24 by the vertical rigid beam 23. This means that the horizontal force borne by the corner connection device of the horizontal rigid beam 24 will be very large; the existing horizontal rigid beam is relatively short, and its end is connected to the horizontal rigid corner plate through a single-layer hinge to withstand the tension transmitted to the horizontal rigid beam; but when the furnace water-cooled wall tube panel undergoes a large thermal expansion, the corner connection device is prone to deformation and damage, affecting the normal and safe operation of the boiler; in addition, the horizontal rigid beam cannot extend to the corner cantilever to support the weight of the burner, and the spiral water-cooled wall tube panel cannot withstand too much vertical load, so the burner and other equipment cannot be fixed on the spiral water-cooled wall tube panel, resulting in difficulty in installing the burner; if the horizontal rigid beam is lengthened, mutual interference will occur at the corner connection, and the self-balancing of the internal force of the rigid beam in a circle of the furnace cannot be achieved. Summary of the invention

[0003] The purpose of the utility model is to provide a corner connection device for the horizontal rigid beam of a four-corner tangential combustion supercritical boiler in view of the above-mentioned deficiencies in the prior art, which can realize self-balancing of the internal force of the horizontal rigid beam and normal expansion and sliding of the corner connection device, prevent damage caused by deformation, and solve the installation problem of the burner, thereby providing a guarantee for the normal and safe operation of the boiler.

[0004] In order to achieve the above-mentioned purpose, the utility model of the corner connection device of the horizontal rigid beam of the four-corner tangential combustion supercritical boiler comprises more than two layers of horizontal rigid beams fixedly arranged on the front and rear walls and the two side walls of the boiler, and the water-cooled wall tube screen arranged on the inner side of each furnace wall; the characteristic is that the length of at least two layers of horizontal rigid beams covers the width of the furnace wall on the corresponding side, and corner bent plates are arranged at the four furnace wall corners corresponding to the two layers of horizontal rigid beams, and two connecting plates are fixedly connected to the two outer sides of the corner bent plates perpendicular to each other, and each connecting plate is connected through its own double layer The hinge is connected to the corresponding horizontal rigid beam, and each connecting plate is set at an angle to the corresponding double-layer hinge. The two outer sides correspond to the double-layer hinges and are staggered in the longitudinal direction. The two outer sides of the corner bent plate are fixedly connected with several finger-shaped plates, and the finger-shaped plates are fixedly connected with the water-cooled wall tube screen on the same side; the two inner sides of the corner bent plate and the water-cooled wall tube screen at the corner of the furnace wall are fixedly connected with two layers of attached plates, each attached plate is provided with a waist-shaped hole, and the two trapezoidal plates are placed on each attached plate of each layer, and the trapezoidal plate is connected to each attached plate of the corresponding layer by several bolts and nuts passing through the waist-shaped holes.

[0005] The corner bent plate of the utility model is in a suspended state. When the furnace water-cooled wall tube panel undergoes thermal expansion during use, the expansion and contraction of several finger-shaped plates can drive the connecting plate on the corresponding side of the corner bent plate to rotate around the hinge shaft in the double-layer hinge, so as to realize the normal expansion and sliding of the corner connecting device and prevent damage caused by deformation; the corner bent plate can make the double-layer hinges on the two mutually perpendicular outer surfaces thereof staggered in the longitudinal direction without interfering with each other, and each horizontal rigid beam and each corner connecting device surround the furnace and tighten the furnace tube panel, so as to achieve self-balance of internal force, and at the same time be located The burners at the four corners can also be installed at the ends of the two horizontal rigid beams in the lower layer of the burner area through two hanging points, which solves the installation problem of the burners and provides guarantee for the normal and safe operation of the boiler; the corner bent plate is connected to the water-cooled wall tube panel through the trapezoidal plate, which can transfer the deadweight of the corner connection device to the water-cooled wall tube panel, prevent the deadweight load of the corner connection device from being transferred to the finger plate, and also facilitate the positioning of the corner bent plate. At the same time, the trapezoidal plate, the water-cooled wall tube panel and the corner bent plate are all connected by bolts + waist-shaped holes for sliding connection, so as not to hinder the thermal expansion of the furnace wall;

[0006] As a further improvement of the utility model, the finger-shaped plates are all fixedly connected with the embedded parts on the flat steel of the water-cooled wall tube panel on the same side, which is convenient for welding and fixing of the finger-shaped plates;

[0007] As a further improvement of the utility model, two layers of attachment plates are fixedly connected to the flat steel of the water-cooled wall tube panel at the corner of the furnace wall, which is convenient for welding and fixing of the attachment plates;

[0008] As a further improvement of the utility model, the trapezoidal plate located on the upper layer is provided with a hand hole, and the insulation material is filled between the two trapezoidal plates; this can prevent the insulation material from being unable to be compacted inside the corner connection device to form a heat radiation zone;

[0009] In summary, the utility model can achieve self-balancing of the internal force of the horizontal rigid beam and normal expansion and sliding of the corner connection device, prevent damage caused by deformation, and solve the installation problem of the burner, providing a guarantee for the normal and safe operation of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a partial cross-sectional view of any side wall of an existing four-corner tangential combustion boiler.

[0011] Figure 2 for Figure 1 Right view of .

[0012] Figure 3 It is a top view of a four-corner tangential combustion boiler using an embodiment of the utility model.

[0013] Figure 4 for Figure 3 An enlarged view of the corner connection device of one of the horizontal rigid beams.

[0014] Figure 5 of Figure 4 AA section view.

[0015] Figure 6 of Figure 4 BB cross-sectional view.

[0016] Figure 7 of Figure 4 CC cross-sectional view.

[0017] Figure 8 for Figure 5 Enlarged view of point D.

[0018] Fig. 9 for Figure 4 Enlarged view of point E. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings.

[0020] like Figures 3 to 9As shown, the corner connection device of the horizontal rigid beam of the four-corner tangential combustion supercritical boiler of this embodiment comprises four layers of horizontal rigid beams 1 fixedly arranged on the front and rear walls and the two side walls of the boiler, and a water-cooled wall tube panel 2 arranged on the inner side of each furnace wall, and the four layers of horizontal rigid beams 1 correspond to the burnout air area and the burner area of ​​the furnace respectively; wherein the lengths of the two layers of horizontal rigid beams 1 corresponding to the upper burnout air area and the lower burner area respectively cover the width of the corresponding furnace wall on one side (the front and rear walls and the two side walls), and corner bent plates 3 are arranged at the four furnace wall cut corners corresponding to the two layers of horizontal rigid beams 1, and the corner bent plates 3 are C-shaped bent plates with two 45° angles corresponding to the furnace wall cut corners, and two connecting plates 4, 5 are welded and fixedly connected on the two outer side surfaces perpendicular to each other of the corner bent plates 3, and each connecting plate 4, 5 is connected to the corresponding horizontal rigid beam 1 through its own double-layer hinge 6 or 7, and the double-layer hinges 6, 7 are Two hinge shafts 18 are provided, and each connecting plate 4, 5 and the corresponding double-layer hinge 6 or 7 are arranged at an angle, and the angle is generally 2-6 degrees. The double-layer hinges 6, 7 corresponding to the two outer sides are staggered in the longitudinal direction. The two outer sides of the corner bent plate 3 are welded and fixedly connected with four finger-shaped plates 8 (several plates are separated like finger shapes), and the finger-shaped plates 8 are welded and fixedly connected with the embedded parts 9 on the flat steel of the water-cooled wall tube panel 2 on the same side; two layers of attached plates 11 are welded and fixedly connected on the two inner sides of the corner bent plate 3 and the flat steel 10 of the water-cooled wall tube panel 2 at the cut corner of the furnace wall, and each attached plate 11 is provided with a waist-shaped hole 12, and two trapezoidal plates 13, 14 are placed on each attached plate 11 of each layer, and the trapezoidal plates 13, 14 are connected with each attached plate 11 of the corresponding layer by several bolts 15 and nuts passing through the waist-shaped holes 12; the two trapezoidal plates 13 are provided with hand holes 16, and the two trapezoidal plates 13, 14 are filled with thermal insulation materials 17;

[0021] During operation, under the action of the pressure in the furnace, the reaction force at the end of the horizontal rigid beam 1 is transmitted to the water-cooled wall tube panel 2 in the vertical direction through the finger-shaped plate 8 welded on the water-cooled wall tube panel 2, so as to achieve force balance; the utility model is provided with corner connection devices at the four cut corners of the furnace corresponding to each layer of the horizontal rigid beam 1, and its corner bent plate 3 is in a suspended state and is easy to deform. When the water-cooled wall tube panel 2 on one side of the furnace undergoes thermal expansion during use, the expansion and contraction of several finger-shaped plates 8 can drive the connecting plate 4 or 5 on the corresponding side of the corner bent plate 3 to rotate around the hinge shaft 18 in the double-layer hinge 6 or 7 (the connecting plate and the double-layer hinge are arranged at an angle to avoid the generation of a rotation dead point), so as to realize the normal expansion and sliding of the corner connection device and prevent damage caused by deformation; the height of the corner bent plate 3 can make the double-layer hinges 6 and 7 on the two mutually perpendicular outer surfaces staggered in the longitudinal direction without interfering with each other, so that Each horizontal rigid beam 1 and each corner connection device surrounds the furnace and tightens the furnace tube panel to balance the pressure in the furnace, which can achieve internal force self-balance. At the same time, each burner located at the four corners can also be installed on the ends of the two lower horizontal rigid beams 1 in the burner area through two hanging points, which solves the installation problem of the burner and provides a guarantee for the normal and safe operation of the boiler; the corner bent plate 3 is overlapped and connected with the water-cooled wall tube panel 2 through two trapezoidal plates 13 and 14, and the deadweight of the corner connection device can be transmitted to the water-cooled wall tube panel 2 to prevent the deadweight load of the corner connection device from being transmitted to the finger plate 8, which is also convenient for positioning the corner bent plate 3. At the same time, the trapezoidal plates 13 and 14 are all connected to the water-cooled wall tube panel 2 and the corner bent plate 3 by bolts + waist-shaped holes for sliding connection so as not to hinder the thermal expansion of the furnace wall; the hand hole 16 can prevent the failure of compacting the insulation material 17 inside the corner connection device to form a heat radiation zone;

[0022] The above embodiments are used for illustration, but it should be understood that the above embodiments are only used for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments.

Claims

1. A corner connection device for horizontal rigid beams of a four-corner tangential combustion supercritical boiler, comprising more than two layers of horizontal rigid beams fixedly arranged on the front and rear walls and both side walls of the boiler, and water-cooled wall tube panels arranged on the inner side of each furnace wall; characterized in that: The length of at least two layers of horizontal rigid beams covers the width of the furnace wall on the corresponding side. Corner bent plates are provided at the four furnace wall corners corresponding to the two layers of horizontal rigid beams. Two connecting plates are fixedly connected to the two outer sides of the corner bent plates which are perpendicular to each other. Each connecting plate is connected to the corresponding horizontal rigid beam through its own double-layer hinge. Each connecting plate is arranged at an angle to the corresponding double-layer hinge. The double-layer hinges corresponding to the two outer sides are staggered in the longitudinal direction. Several finger-shaped plates are fixedly connected to the two outer sides of the corner bent plates. The finger-shaped plates are fixedly connected to the water-cooled wall tube screens on the same side. Two layers of attached plates are fixedly connected to the two inner sides of the corner bent plates and the water-cooled wall tube screens at the furnace wall corners. Each attached plate is provided with a waist-shaped hole. Two trapezoidal plates are placed on each attached plate of each layer. The trapezoidal plates are connected to each attached plate of the corresponding layer by several bolts and nuts passing through the waist-shaped holes.

2. The corner connection device of horizontal rigid beam of a four-corner tangential combustion supercritical boiler according to claim 1, characterized in that: The finger-shaped plates are all fixedly connected with the embedded parts on the flat steel of the water-cooled wall tube panel on the same side.

3. The corner connection device of horizontal rigid beam of a four-corner tangential combustion supercritical boiler according to claim 1 or 2, characterized in that: Two layers of attached plates are fixedly connected to the flat steel of the water-cooled wall tube panel at the cut corner of the furnace wall.

4. The corner connection device of horizontal rigid beam of a four-corner tangential combustion supercritical boiler according to claim 3, characterized in that: The trapezoidal plate located on the upper layer is provided with a hand hole, and the space between the two trapezoidal plates is filled with a heat-insulating material.

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