High-temperature reheater of boiler

Abstract

The utility model provides a high-temperature reheater of a boiler, and belongs to the technical field of boilers. Comprising a row of U-shaped pipelines, a plurality of connecting strips are fixed on the row of U-shaped pipelines, a connecting column is connected between the upper connecting strip and the lower connecting strip, an upper box and a lower box are respectively arranged on the U-shaped pipelines, the upper box and the lower box are communicated with the U-shaped pipelines, the top of the upper box is provided with an inverted-V-shaped protrusion, the top of the lower box is provided with a concave portion, and the lower box is located under the upper box. Through the arrangement of the upper box, the lower box, the inverted-V-shaped protrusions and the sunken parts, the upper box and the lower box are installed on the U-shaped pipeline, the contact area between the U-shaped pipeline and high-temperature smoke generated by boiler combustion is increased, and meanwhile the contact area between the upper box and the lower box and the high-temperature smoke is increased through the cooperation of the inverted-V-shaped protrusions and the sunken parts; and therefore, the contact area between the U-shaped pipeline and the high-temperature flue gas is increased again, and the heat exchange rate of the high-temperature reheater is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a high-temperature reheater of a boiler. Background Art

[0002] A boiler high-temperature reheater is a device used to increase the temperature of steam. It is usually installed in the steam system of a boiler. Its main function is to further heat the steam generated by the boiler to increase its thermal energy and efficiency, thereby improving the efficiency of power generation or heating. The high-temperature reheater is usually a row of U-shaped pipes. Steam flows inside the high-temperature reheater. When the primary steam generated by the boiler passes through the high-temperature reheater, the high-temperature flue gas generated by the combustion inside the boiler passes through the high-temperature reheater, heating the steam flowing through the high-temperature reheater, heating the steam to a higher temperature, and then sending it to the turbine for energy conversion.

[0003] When a common boiler high-temperature reheater is in use, the high-temperature flue gas generated by combustion inside the boiler passes through the high-temperature reheater, thereby heating the steam flowing through the high-temperature reheater. However, the high-temperature flue gas is only in contact with the high-temperature flue gas through the U-shaped pipe of the high-temperature reheater. The contact area with the high-temperature flue gas is small, and the heat exchange rate needs to be improved. Therefore, the present application provides a boiler high-temperature reheater to meet the needs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a boiler high-temperature reheater to solve the technical problem that the heat exchange rate of the boiler high-temperature reheater needs to be improved.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A boiler high-temperature reheater includes a row of U-shaped pipes, a plurality of connecting strips are fixed on the row of U-shaped pipes, a connecting column is connected between the upper and lower connecting strips, an upper box and a lower box are respectively provided on the U-shaped pipes, the upper box and the lower box are both connected to the U-shaped pipes, an inverted V-shaped protrusion is provided on the top of the upper box, a recessed portion is provided on the top of the lower box, and the lower box is located directly below the upper box.

[0007] Preferably, a plurality of air inlets are provided on the inverted V-shaped protrusion and depression, a plurality of air outlets are provided on the bottom of the upper box and the lower box, a plurality of vertical tubes are fixed inside the upper box, the top of the vertical tubes are connected to the air inlet of the upper box, the bottom of the vertical tubes are connected to the air outlet of the upper box, a circular tube is fixed inside the lower box, the top of the circular tube is connected to the air inlet of the lower box, and the bottom of the circular tube is connected to the air outlet of the lower box.

[0008] Preferably, the circular tube includes a vertical portion and an inclined portion connected in sequence, and the number of inclined portions on the same circular tube is two, and the two inclined portions are symmetrically arranged with the central vertical plane passing through the vertical portion as the symmetry plane, the top of the vertical portion is connected to the air inlet of the lower box, and the bottom of the inclined portion is connected to the air outlet of the lower box.

[0009] Preferably, the air inlet on the lower box is located in the middle of the recessed portion.

[0010] Preferably, a plurality of convex rings are fixed on the vertical pipe.

[0011] Preferably, the circumferential surface of the convex ring is a curved surface.

[0012] Preferably, guide surfaces are provided on both sides of the inner walls of the upper box and the lower box.

[0013] Preferably, the top of the inverted V-shaped protrusion is provided with a chamfer.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] In the above scheme, the upper box, the lower box, the inverted V-shaped protrusion and the recessed portion are arranged, and the upper box and the lower box are installed on the U-shaped pipe, thereby increasing the contact area between the U-shaped pipe and the high-temperature flue gas generated by the boiler combustion. At the same time, the contact area between the upper box and the lower box and the high-temperature flue gas is increased by the cooperation of the inverted V-shaped protrusion and the recessed portion, thereby further increasing the contact area between the U-shaped pipe and the high-temperature flue gas, thereby improving the heat exchange rate of the high-temperature reheater.

[0016] Through the arrangement of vertical tubes and circular tubes, when the high-temperature flue gas passes through the inverted V-shaped protrusion, part of the high-temperature flue gas enters the vertical tube, and the vertical tube reheats the steam passing through the upper box. When the high-temperature flue gas passes through the recessed part, part of the high-temperature flue gas enters the circular tube, and the circular tube reheats the steam passing through the lower box, thereby further improving the heat exchange rate of the high-temperature reheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a front cross-sectional view of the upper box of the utility model;

[0020] Figure 3 This is a schematic top view of a cross section of the vertical pipe of the present invention;

[0021] Figure 4 It is a right sectional view of the vertical pipe of the utility model;

[0022] Figure 5 It is a right sectional view of the circular tube of the present utility model;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the recessed portion of the present invention.

[0024] [Reference Signs]

[0025] 1. U-shaped pipe; 2. Upper box; 3. Lower box; 4. Inverted V-shaped protrusion; 5. Recessed portion; 6. Air inlet; 7. Air outlet; 8. Vertical pipe; 9. Circular pipe; 91. Vertical portion; 92. Inclined portion; 10. Protruding ring; 11. Connecting strip; 12. Connecting column.

[0026] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION

[0027] The following describes in detail a boiler high-temperature reheater provided by the present invention, with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0028] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0029] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0030] like Figures 1-6 As shown, an embodiment of the present invention provides a boiler high-temperature reheater, comprising a row of U-shaped pipes 1, a plurality of connecting strips 11 being fixed on the row of U-shaped pipes 1, a connecting column 12 being connected between the upper and lower connecting strips 11, an upper box 2 and a lower box 3 being respectively provided on the U-shaped pipe 1, the upper box 2 and the lower box 3 being both connected to the U-shaped pipe 1, an inverted V-shaped protrusion 4 being provided on the top of the upper box 2, a recessed portion 5 being provided on the top of the lower box 3, and the lower box 3 being located directly below the upper box 2, the connecting strips 11 being used to connect the plurality of U-shaped pipes 1 forming a row into a whole, the connecting column 12 being used to connect the upper and lower connecting strips 11, and the contact area between the U-shaped pipe 1 and the high-temperature flue gas is increased by the cooperation of the upper box 2, the lower box 3, the inverted V-shaped protrusion 4 and the recessed portion 5, thereby improving the heat exchange rate of the high-temperature reheater.

[0031] like Figure 1 、 Figure 4 、 Figure 5 and Figure 6 As shown, in this embodiment, a plurality of air inlets 6 are provided on the inverted V-shaped protrusion 4 and the recessed portion 5, and a plurality of air outlets 7 are provided at the bottom of the upper box 2 and the lower box 3. A plurality of vertical pipes 8 are fixed inside the upper box 2, and the top of the vertical pipe 8 is connected to the air inlet 6 of the upper box 2, and the bottom of the vertical pipe 8 is connected to the air outlet 7 of the upper box 2. A circular tube 9 is fixed inside the lower box 3, and the top of the circular tube 9 is connected to the air inlet 6 of the lower box 3, and the bottom of the circular tube 9 is connected to the air outlet 7 of the lower box 3. Part of the high-temperature flue gas passing through the inverted V-shaped protrusion 4 enters the vertical pipe 8 from the air inlet 6 of the upper box 2 and is discharged from the air outlet 7 at the bottom of the upper box 2. When the high-temperature flue gas passes through the vertical pipe 8, the steam passing through the upper box 2 is heated again through the vertical pipe 8. At the same time, the high-temperature flue gas discharged from the bottom of the upper box 2 and the high-temperature flue gas passing through the upper box 2 flow through the recessed portion 5 at the top of the lower box 3. Under the gathering effect of the recessed portion 5, the residence time of the high-temperature flue gas at the top of the lower box 3 is increased, and the heat exchange rate of the lower box 3 is improved. At the same time, part of the high-temperature flue gas enters the circular tube 9 from the air inlet 6 at the top of the lower box 3 and is then discharged from the air outlet 7 at the bottom of the lower box 3. The high-temperature flue gas passing through the circular tube 9 heats the steam passing through the lower box 3 again, and the heat exchange rate of the lower box 3 is further improved.

[0032] like Figure 5 As shown, in this embodiment, the circular tube 9 includes a vertical portion 91 and an inclined portion 92 connected in sequence. There are two inclined portions 92 on the same circular tube 9, and the two inclined portions 92 are symmetrically arranged with the central vertical plane passing through the vertical portion 91 as the symmetry plane. The top of the vertical portion 91 is connected to the air inlet 6 of the lower box 3, and the bottom of the inclined portion 92 is connected to the air outlet 7 of the lower box 3. The cooperation between the vertical portion 91 and the inclined portion 92 increases the contact area between the steam and the circular tube 9, thereby improving the heat exchange rate between the circular tube 9 and the steam.

[0033] like Figure 5 As shown, in this embodiment, the air inlet 6 on the lower box 3 is located in the middle of the recessed portion 5, and the high-temperature flue gas flowing through is gathered through the recessed portion 5. The air inlet 6 on the lower box 3 is located in the middle of the recessed portion 5, which can increase the air intake amount entering the circular tube 9 from the air inlet 6, thereby further improving the heat exchange rate between the circular tube 9 and the steam.

[0034] like Figure 4 As shown, in this embodiment, a plurality of convex rings 10 are fixed on the vertical pipe 8. The convex rings 10 are used to increase the contact area between the vertical pipe 8 and the steam, thereby improving the heating effect of the steam.

[0035] like Figure 4 As shown, in this embodiment, the circumferential surface of the convex ring 10 is a curved surface, which is used to guide the steam flowing through so that the steam contacts the vertical pipe 8 under the action of guidance, thereby further improving the heating effect of the vertical pipe 8 on the steam.

[0036] like Figure 2 As shown, in this embodiment, guide surfaces are provided on both sides of the inner walls of the upper box 2 and the lower box 3, and the guide surfaces are used to guide the steam to flow smoothly through the upper box 2 and the lower box 3, thereby reducing the blockage of steam in the upper box 2 and the lower box 3.

[0037] like Figure 4 As shown, in this embodiment, the top of the inverted V-shaped protrusion 4 is provided with a chamfer, and the chamfer is used to reduce the erosion of the top of the inverted V-shaped protrusion 4 when the high-temperature flue gas flows through the inverted V-shaped protrusion 4.

[0038] Working principle: The steam passing through the U-shaped pipe 1 passes through the upper box 2 and the lower box 3 in turn. When the high-temperature flue gas passes through the U-shaped pipe 1, the contact area between the U-shaped pipe 1 and the high-temperature flue gas generated by the boiler combustion is increased through the upper box 2 and the lower box 3. At the same time, the contact area between the upper box 2 and the lower box 3 and the high-temperature flue gas is increased through the cooperation of the inverted V-shaped protrusion 4 and the recessed part 5, and the contact area between the U-shaped pipe 1 and the high-temperature flue gas is increased again. Part of the high-temperature flue gas passing through the inverted V-shaped protrusion 4 enters the vertical pipe 8 from the air inlet 6 of the upper box 2 and is then discharged from the air outlet 7 at the bottom of the upper box 2. When the high-temperature flue gas passes through the vertical pipe 8, the steam passing through the upper box 2 is heated again through the cooperation of the vertical pipe 8 and the convex ring 10. At the same time, the high-temperature flue gas discharged from the bottom of the upper box 2 The high-temperature flue gas together with the high-temperature flue gas passing through the upper box 2 flows through the recessed portion 5 at the top of the lower box 3. Under the gathering effect of the recessed portion 5, the residence time of the high-temperature flue gas at the top of the lower box 3 is increased, thereby improving the heat exchange rate of the lower box 3. At the same time, part of the high-temperature flue gas enters the circular tube 9 from the air inlet 6 at the top of the lower box 3, passes through the vertical portion 91 and the inclined portion 92 of the circular tube 9 in turn, and is then discharged from the air outlet 7 at the bottom of the lower box 3. The high-temperature flue gas passing through the circular tube 9 heats the steam passing through the lower box 3 again, thereby improving the heat exchange rate of the lower box 3 again. The heat exchange rate of the U-shaped pipe 1 is greatly increased through the upper box 2, the lower box 3, the inverted V-shaped protrusion 4, the recessed portion 5, the vertical pipe 8 and the circular pipe 9, thereby improving the heating effect of the steam passing through the U-shaped pipe 1.

[0039] The present invention encompasses any substitutions, modifications, equivalent methods, and solutions that are not within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail in the preferred embodiments of the present invention above, but those skilled in the art can fully understand the present invention without these detailed descriptions.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A boiler high-temperature reheater, comprising a row of U-shaped pipes (1), characterized in that: A plurality of connecting bars (11) are fixed on a row of the U-shaped pipes (1), and a connecting column (12) is connected between the upper and lower connecting bars (11). An upper box (2) and a lower box (3) are respectively provided on the U-shaped pipe (1), and both the upper box (2) and the lower box (3) are connected to the U-shaped pipe (1). An inverted V-shaped protrusion (4) is provided on the top of the upper box (2), and a recessed portion (5) is provided on the top of the lower box (3). The lower box (3) is located directly below the upper box (2).

2. The boiler high-temperature reheater according to claim 1, characterized in that: The inverted V-shaped protrusion (4) and the recessed portion (5) are both provided with a plurality of air inlets (6), and the bottoms of the upper box (2) and the lower box (3) are both provided with a plurality of air outlets (7). A plurality of vertical tubes (8) are fixed inside the upper box (2), the tops of the vertical tubes (8) are connected to the air inlets (6) of the upper box (2), and the bottoms of the vertical tubes (8) are connected to the air outlets (7) of the upper box (2). A circular tube (9) is fixed inside the lower box (3), the tops of the circular tubes (9) are connected to the air inlets (6) of the lower box (3), and the bottoms of the circular tubes (9) are connected to the air outlets (7) of the lower box (3).

3. The boiler high-temperature reheater according to claim 2, characterized in that: The circular tube (9) comprises a vertical portion (91) and an inclined portion (92) connected in sequence. The number of the inclined portions (92) on the same circular tube (9) is two, and the two inclined portions (92) are symmetrically arranged with a central vertical plane passing through the vertical portion (91) as a symmetry plane. The top of the vertical portion (91) is connected to the air inlet (6) of the lower box (3), and the bottom of the inclined portion (92) is connected to the air outlet (7) of the lower box (3).

4. The boiler high-temperature reheater according to claim 2, characterized in that: The air inlet (6) on the lower box (3) is located in the middle of the recessed portion (5).

5. The boiler high-temperature reheater according to claim 2, characterized in that: A plurality of convex rings (10) are fixed on the vertical pipe (8).

6. The boiler high-temperature reheater according to claim 5, characterized in that: The circumferential surface of the convex ring (10) is a curved surface.

7. The boiler high-temperature reheater according to claim 1, characterized in that: Guide surfaces are provided on both sides of the inner walls of the upper box (2) and the lower box (3).

8. The boiler high-temperature reheater according to claim 1, characterized in that: The top of the inverted V-shaped protrusion (4) is provided with a chamfer.

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