Boiler reheater outlet header structure

Abstract

The utility model discloses a boiler reheater outlet header structure, which comprises a middle hot section header, a furnace left cold section header, a furnace right cold section header and an inlet header, the middle hot section header is communicated with a hot section of a low-temperature reheater, the furnace left cold section header is communicated with a left cold section of the low-temperature reheater, the furnace right cold section header is communicated with a right cold section of the low-temperature reheater, and the inlet header is communicated with the middle hot section header. The inlet header is communicated with the high-temperature reheater; one end of the middle hot section header is communicated with the first end of the first transition header, the other end of the middle hot section header is communicated with the first end of the second transition header, the second end of the first transition header is communicated with one end of the inlet header, and the second end of the second transition header is communicated with the other end of the inlet header; the furnace left cooling section header is communicated with the first transition header, and the furnace right cooling section header is communicated with the second transition header. According to the outlet header structure of the boiler reheater, the flow deviation of the working medium of the inlet header in the width direction of the hearth is reduced, and the heat deviation between screens of the working medium entering the high-temperature reheater is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reheaters, in particular to an outlet header structure of a boiler reheater. Background Art

[0002] The complex smoke temperature distribution in the boiler causes the heating surface to have a more obvious heat absorption deviation, and the heat absorption is distributed in a double peak shape along the width of the furnace, such as Figure 1 At present, most boiler reheaters use two inlet headers for introduction at both ends and one outlet header for extraction. This structure causes the flow rate between the reheater screens to present a concave distribution law, as shown in Figure 2. Figure 1 As shown by the orange lines in the figure, the maximum flow rate occurs at the left and right ends along the furnace width, and the minimum flow rate occurs in the middle. This flow distribution deviation between screens coupled with the heat load deviation on the flue gas side causes a large thermal deviation in the reheater, which can easily cause the reheater to overheat and affect the safe and economical operation of the unit. It is more serious for supercritical and ultra-supercritical units with higher parameters. Utility Model Content

[0003] In view of this, the utility model provides a boiler reheater outlet header structure, which reduces the flow deviation of the working medium along the furnace width direction of the inlet header and reduces the thermal deviation between the screens of the working medium entering the high-temperature reheater.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A boiler reheater outlet header structure, comprising:

[0006] The intermediate hot section header is connected to the hot section of the low-temperature reheater;

[0007] The left cold section header of the furnace is connected to the left cold section of the low-temperature reheater;

[0008] The furnace right cold section header is connected to the right cold section of the low-temperature reheater;

[0009] An inlet header connected to the high temperature reheater;

[0010] One end of the intermediate hot section header is connected to the first end of the first transition header, and the other end is connected to the first end of the second transition header. The second end of the first transition header is connected to one end of the inlet header, and the second end of the second transition header is connected to the other end of the inlet header; the left cold section header of the furnace is connected to the first transition header, and the right cold section header of the furnace is connected to the second transition header.

[0011] Optionally, the left cold section header of the furnace is connected to the right cold section header of the furnace through an intermediate connecting pipe, the inner cavity of the intermediate connecting pipe and the inner cavity of the left cold section header of the furnace are separated by a first partition, and the inner cavity of the intermediate connecting pipe and the inner cavity of the right cold section header of the furnace are separated by a second partition.

[0012] Optionally, the intermediate hot section header is arranged in parallel with the furnace left cold section header, and the furnace left cold section header is arranged in parallel with the inlet header;

[0013] The furnace left cold section header is coaxially arranged with the furnace right cold section header.

[0014] Optionally, the height of the intermediate hot section header is greater than the height of the furnace left cold section header, and the height of the furnace left cold section header is greater than the height of the inlet header;

[0015] The height of the connection position between the first transition header and the intermediate hot section header is higher than the height of the connection position between the first transition header and the inlet header, and the height of the connection position between the second transition header and the intermediate hot section header is higher than the height of the connection position between the second transition header and the inlet header.

[0016] Optionally, the length of the left cold section header of the furnace is the same as that of the right cold section header of the furnace, and the length of the first transition header is the same as that of the second transition header.

[0017] Optionally, the furnace left cold section header is connected to the tube panel of the low-temperature reheater through a first header, the furnace right cold section header is connected to the tube panel of the low-temperature reheater through a second header, and the middle hot section header is connected to the tube panel of the low-temperature reheater through a third header.

[0018] Optionally, the inlet header is connected to the high-temperature reheater through a fourth header.

[0019] Optionally, the intermediate hot section header is connected to the first transition header and / or the second transition header by a right-angle elbow;

[0020] The inlet header is connected to the first transition header and / or the second transition header by a right-angle elbow.

[0021] Optionally, the furnace left cold section header is directly connected to the tube panel of the low-temperature reheater, the furnace right cold section header is directly connected to the tube panel of the low-temperature reheater, and the middle hot section header is directly connected to the tube panel of the low-temperature reheater.

[0022] Optionally, the intermediate hot section header is vertically arranged with the first transition header, the first transition header is parallelly arranged with the second transition header, and the inlet header is vertically arranged with the first transition header.

[0023] It can be seen from the above technical scheme that the boiler reheater outlet manifold structure provided by the utility model is used to supplement the flow rate and temperature of the working fluid flowing out of the left cold section manifold and the right cold section manifold by setting the intermediate hot section manifold. The fluid in the left cold section manifold of the furnace is mixed with the fluid in the intermediate hot section manifold in the first transition manifold, and the right cold section manifold of the furnace is mixed with the intermediate hot section manifold in the second transition manifold. The fluids in the first transition manifold and the second transition manifold are merged into the inlet manifold of the next stage reheater, that is, the inlet manifold of the high-temperature reheater. The temperature and flow rate of the fluid after the fluid in the left cold section manifold of the furnace is mixed with the fluid in the intermediate hot section manifold are close to the temperature and flow rate of the fluid after the fluid in the right cold section manifold of the furnace is mixed with the fluid in the intermediate hot section manifold, thereby reducing the flow deviation of the fluid (working fluid) of the inlet manifold along the width direction of the furnace, reducing the thermal deviation between the panels of the working fluid entering the high-temperature reheater, and effectively alleviating the occurrence of accidents such as over-temperature and tube explosion during the operation of the tube panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the deviation coefficient of working fluid flow and the deviation coefficient of tube screen heat absorption;

[0026] Figure 2 A schematic structural diagram of a boiler reheater outlet header structure at an angle provided by an embodiment of the utility model;

[0027] Figure 3 A schematic structural diagram of a boiler reheater outlet header structure from another angle provided in an embodiment of the utility model;

[0028] Figure 4 A structural schematic diagram of the position of the fourth header of the boiler reheater outlet header structure provided by an embodiment of the utility model;

[0029] Figure 5 A structural schematic diagram of a boiler reheater outlet header structure from another angle provided in an embodiment of the utility model;

[0030] Figure 6 A schematic diagram of the connection structure between the left cold section header and the first header of the furnace provided in an embodiment of the utility model;

[0031] Figure 7 A schematic diagram of the connection structure between the intermediate hot section header and the third header provided in an embodiment of the utility model;

[0032] Figure 8 A schematic diagram of the connection structure between the furnace right cold section header and the second collecting pipe provided in an embodiment of the utility model.

[0033] in:

[0034] 1. Low-temperature reheater; 2. Second transition header; 3. Right cold section header; 4. Intermediate hot section header; 5. Left cold section header; 6. First transition header; 7. Inlet header; 8. High-temperature reheater; 9. Intermediate connecting pipe; 10. Third header; 11. First header; 12. Second header; 13. Fourth header. DETAILED DESCRIPTION

[0035] The utility model discloses a boiler reheater outlet header structure, which reduces the flow deviation of working medium in the inlet header along the furnace width direction and reduces the thermal deviation between screens of working medium entering the high-temperature reheater.

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] See also Figures 1 to 8 The outlet header structure of the boiler reheater of the utility model comprises an intermediate hot section header 4, a furnace left cold section header 5, a furnace right cold section header 3 and an inlet header 7. The intermediate hot section header 4 is connected to the hot section of the low-temperature reheater 1, the furnace left cold section header 5 is connected to the left cold section of the low-temperature reheater 1, and the furnace right cold section header 3 is connected to the right cold section of the low-temperature reheater 1. The inlet header 7 is connected to the heat exchange pipe of the high-temperature reheater 8. One end of the intermediate hot section header 4 is connected to the first end of the first transition header 6, and the other end is connected to the first end of the second transition header 2, the second end of the first transition header 6 is connected to one end of the inlet header 7, and the second end of the second transition header 2 is connected to the other end of the inlet header 7. The inner cavity of the furnace left cold section header 5 is connected to the inner cavity of the first transition header 6, and the inner cavity of the furnace right cold section header 3 is connected to the inner cavity of the second transition header 2.

[0038] The inner cavities of the left cold section header 5 and the right cold section header 3 are not connected, so that the fluid in the left cold section header 5 flows to the first transition header 6, and the fluid in the right cold section header 3 flows to the second transition header 2. The second transition header 2 is arranged on the right side of the furnace, and the first transition header 6 is arranged on the left side of the furnace.

[0039] In the outlet header structure of the boiler reheater of the utility model, the hot working medium in the middle hot section header 4 is supplemented with the cold working medium flowing out of the left cold section header 5 and the right cold section header 3 of the furnace for flow and temperature, and the two working mediums are mixed, which reduces the heat load deviation on the flue gas side, so that the heat deviation of the reheater is small. The fluid in the left cold section header 5 of the furnace is mixed with the fluid in the middle hot section header 4 in the first transition header 6, and the right cold section header 3 of the furnace is mixed with the middle hot section header 4 in the second transition header 2. The fluids in the first transition header 6 and the second transition header 2 are merged into the inlet header 7 of the next stage reheater, that is, the inlet header 7 of the high temperature reheater 8. The temperature and flow rate of the fluid obtained by mixing the fluid in the left cold section header 5 and the fluid in the middle hot section header 4 are close to the temperature and flow rate of the fluid obtained by mixing the fluid in the right cold section header 3 and the fluid in the middle hot section header 4, thereby reducing the flow deviation of the fluid (working fluid) in the inlet header 7 along the width direction of the furnace, reducing the thermal deviation between the panels of the working fluid entering the high-temperature reheater, and effectively alleviating the occurrence of accidents such as over-temperature and tube burst during operation of the tube panel.

[0040] In one embodiment, the furnace left cold section header 5 is connected to the furnace right cold section header 3 through an intermediate connecting pipe 9. The inner cavity of the intermediate connecting pipe 9 and the inner cavity of the furnace left cold section header 5 are separated by a first partition, and the inner cavity of the intermediate connecting pipe 9 and the inner cavity of the furnace right cold section header 3 are separated by a second partition. The intermediate connecting pipe 9 is used to connect and support the furnace left cold section header 5 and the furnace right cold section header 3, thereby improving the structural strength of the left cold section header 5 and the furnace right cold section header 3 and extending the service life. The furnace left cold section header 5, the furnace right cold section header 3 and the intermediate connecting pipe 9 are coaxially arranged.

[0041] Reference Figure 2 and Figure 5 , the middle hot section header 4 is arranged in parallel with the left cold section header 5 of the furnace, the left cold section header 5 of the furnace is arranged in parallel with the inlet header 7, and the left cold section header 5 of the furnace is arranged coaxially with the right cold section header 3 of the furnace. Among them, the middle hot section header 4, the left cold section header 5 of the furnace and the inlet header 7 are all arranged parallel to the ground. Since the left cold section header 5 of the furnace is coaxially arranged with the right cold section header 3 of the furnace, the connecting line of the left cold section header 5 of the furnace and the right cold section header 3 of the furnace is arranged parallel to the middle hot section header 4.

[0042] In order to facilitate the flow of working medium, the height of the middle hot section header 4 is greater than the height of the left cold section header 5 of the furnace, and the height of the left cold section header 5 of the furnace is greater than the height of the inlet header 7. Since the left cold section header 5 of the furnace is coaxially arranged with the right cold section header 3 of the furnace, the height of the right cold section header 3 of the furnace is greater than the height of the inlet header 7, so that the working medium in the middle hot section header 4, the left cold section header 5 of the furnace and the right cold section header 3 can flow to the inlet header 7. The height of the connection position of the first transition header 6 with the middle hot section header 4 is higher than the height of the connection position of the first transition header 6 with the inlet header 7, so that the first transition header 6 is arranged on the inclined ground, and the height of the end connected to the middle hot section header 4 is high, and the height of the end connected to the inlet header 7 is low. Similarly, the height of the connection position of the second transition header 2 with the middle hot section header 4 is higher than the height of the connection position of the second transition header 2 with the inlet header 7, that is, the second transition header 2 is arranged on the inclined ground, and the height of the end connected to the middle hot section header 4 is high, and the height of the end connected to the inlet header 7 is low. The above structural arrangement facilitates the working fluid in the middle hot section header 4, the furnace left cold section header 5 and the furnace right cold section header 3 to flow smoothly into the inlet header 7.

[0043] The lengths of the left cold section header 5, the right cold section header 3 and the middle hot section header 4 are divided according to the flow rate, and the flow rate division method can be based on the numerical simulation or thermal calculation method to calculate the heat flux of each tube panel. Figure 5 As shown, the lengths of the left cold section header 5 and the right cold section header 3 of the furnace are the same, and the length of the first transition header 6 is the same as the length of the second transition header 2.

[0044] In one embodiment, the left cold section header 5 of the furnace is connected to the cold section tube panel of the low temperature reheater 1 through the first header 11. Figure 6 As shown in the figure, the first header 11 is not connected to the intermediate hot section header 4. The right cold section header 3 of the furnace is connected to the cold section tube panel of the low temperature reheater 1 through the second header 12, as shown in FIG. Figure 8 As shown in the figure, the second header 12 is not connected to the intermediate hot section header 4. The intermediate hot section header 4 is connected to the hot section tube panel of the low temperature reheater 1 through the third header 10, as shown in FIG. Figure 7 As shown, in this figure, the third collecting pipe 10 is not connected to the intermediate connecting pipe 9.

[0045] In other embodiments, the furnace left cold section header 5 can also be directly connected to the cold section tube panel of the low-temperature reheater 1, the furnace right cold section header 3 can be directly connected to the cold section tube panel of the low-temperature reheater 1, and the middle hot section header 4 can be directly connected to the hot section tube panel of the low-temperature reheater 1, which is not limited here.

[0046] The inlet header 7 can be connected to the high temperature reheater 8 through the fourth header 13. Figure 4 As shown, it can also be directly connected to the tube panel of the high-temperature reheater 8.

[0047] Specifically, the intermediate hot section header 4 is connected to the first transition header 6 and the second transition header 2 by a right-angle elbow. The inlet header 7 is connected to the first transition header 6 and the second transition header 2 by a right-angle elbow to reduce the resistance of the working medium flow. A part of the working medium in the intermediate hot section header 4 flows into the first transition header 6 through the right-angle elbow, and after mixing with the cold section working medium flowing from the left cold section header 5 of the furnace to the first transition header 6 in the first transition header 6, it flows to the inlet header 7 through the right-angle elbow. Another part of the working medium in the intermediate hot section header 4 flows into the second transition header 2 through the right-angle elbow, and after mixing with the cold section working medium flowing from the right cold section header 3 of the furnace to the second transition header 2 in the second transition header 2, it flows to the inlet header 7 through the right-angle elbow.

[0048] Furthermore, the intermediate hot section header 4 is arranged vertically to the first transition header 6 , the first transition header 6 is arranged parallel to the second transition header 2 , and the inlet header 7 is arranged vertically to the first transition header 6 .

[0049] The utility model reduces the boiler reheater outlet header structure along the furnace width direction ( Figure 5 The flow deviation of the working fluid in the left and right directions in the heat exchanger is reduced, which reduces the thermal deviation of the working fluid between the tube panels entering the next stage reheater, and effectively alleviates the occurrence of accidents such as over-temperature and tube burst during the operation of the tube panel.

[0050] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this solution.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this solution, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A boiler reheater outlet header structure, characterized in that: include: The intermediate hot section header is connected to the hot section of the low-temperature reheater; The left cold section header of the furnace is connected to the left cold section of the low-temperature reheater; The furnace right cold section header is connected to the right cold section of the low-temperature reheater; An inlet header connected to the high temperature reheater; One end of the intermediate hot section header is connected to the first end of the first transition header, and the other end is connected to the first end of the second transition header. The second end of the first transition header is connected to one end of the inlet header, and the second end of the second transition header is connected to the other end of the inlet header; the left cold section header of the furnace is connected to the first transition header, and the right cold section header of the furnace is connected to the second transition header.

2. The boiler reheater outlet header structure according to claim 1, characterized in that: The left cold section header of the furnace is connected to the right cold section header of the furnace through an intermediate connecting pipe, the inner cavity of the intermediate connecting pipe and the inner cavity of the left cold section header of the furnace are separated by a first partition, and the inner cavity of the intermediate connecting pipe and the inner cavity of the right cold section header of the furnace are separated by a second partition.

3. The boiler reheater outlet header structure according to claim 1 or 2, characterized in that: The intermediate hot section header is arranged in parallel with the furnace left cold section header, and the furnace left cold section header is arranged in parallel with the inlet header; The furnace left cold section header is coaxially arranged with the furnace right cold section header.

4. The boiler reheater outlet header structure according to claim 1, characterized in that: The height of the intermediate hot section header is greater than the height of the left cold section header of the furnace, and the height of the left cold section header of the furnace is greater than the height of the inlet header; The height of the connection position between the first transition header and the intermediate hot section header is higher than the height of the connection position between the first transition header and the inlet header, and the height of the connection position between the second transition header and the intermediate hot section header is higher than the height of the connection position between the second transition header and the inlet header.

5. The boiler reheater outlet header structure according to claim 1, characterized in that: The length of the left cold section header of the furnace is the same as that of the right cold section header of the furnace, and the length of the first transition header is the same as that of the second transition header.

6. The boiler reheater outlet header structure according to claim 1, characterized in that: The left cold section header of the furnace is connected to the tube panel of the low-temperature reheater through the first header, the right cold section header of the furnace is connected to the tube panel of the low-temperature reheater through the second header, and the middle hot section header is connected to the tube panel of the low-temperature reheater through the third header.

7. The boiler reheater outlet header structure according to claim 6, characterized in that: The inlet header is communicated with the high-temperature reheater through a fourth header.

8. The boiler reheater outlet header structure according to claim 1, characterized in that: The intermediate hot section header is connected to the first transition header and / or the second transition header by a right-angle elbow; The inlet header is connected to the first transition header and / or the second transition header by a right-angle elbow.

9. The boiler reheater outlet header structure according to claim 1, characterized in that: The furnace left cold section header is directly connected to the tube panel of the low temperature reheater, the furnace right cold section header is directly connected to the tube panel of the low temperature reheater, and the middle hot section header is directly connected to the tube panel of the low temperature reheater.

10. The boiler reheater outlet header structure according to claim 1, characterized in that: The intermediate hot section header is vertically arranged with the first transition header, the first transition header is parallelly arranged with the second transition header, and the inlet header is vertically arranged with the first transition header.

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