Novel gas turbine waste heat boiler header

Abstract

The utility model discloses a novel gas turbine waste heat boiler header which comprises a header body, the header body is divided into a header left barrel and a header right barrel through a middle partition plate, a high-pressure cavity and a medium-pressure cavity which are independent are formed, and the high-pressure cavity and the medium-pressure cavity are connected with heating surface tube bundles of a high-pressure economizer and a medium-pressure economizer respectively. The left header barrel and the right header barrel are located on the same axis. The header structure is shared by the high-pressure economizer and the medium-pressure economizer, double-system splicing is achieved by segmenting the header and using the middle partition plate, traditional modular limitation is broken through, the transverse row number of the heating surface of the medium-pressure economizer can be dynamically adjusted, and therefore the approaching point temperature is accurately controlled, and the waste heat utilization efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of gas-fired steam combined cycle waste heat boiler technology, and in particular to a novel gas turbine waste heat boiler header, which is a shared header structure for the high-pressure economizer and medium-pressure economizer of a gas turbine waste heat boiler with a three-pressure reheat system, and is particularly suitable for gas turbine waste heat boiler systems of class 9F and above. Background Technology

[0002] Conventional 9F-class and above gas turbine waste heat boilers employ a three-pressure (high-pressure, medium-pressure, and low-pressure) reheat system. This system achieves efficient recovery and utilization of waste heat from the gas turbine exhaust by interleaving heating surfaces at each stage and ensuring specific node and proximity temperatures for each system. The medium-pressure economizer is typically arranged as an independent module. For example, it may be a separate unit with one or more rows of heating surface tube bundles and an independent header positioned in front of or behind other heating surfaces. Alternatively, it may be arranged horizontally alongside the high-pressure economizer but in a different module (e.g., a waste heat boiler horizontally arranged with three modules on the left, middle, and right; the left and middle modules are for the high-pressure economizer, and the right module is for the medium-pressure economizer). An example of an independent header arrangement is attached. Figure 1 As shown.

[0003] However, with the intensification of competition among combined cycle units and the increasing demands on heat balance parameters, the parameters of the intermediate-pressure system are becoming increasingly stringent. The node and proximity point temperatures are further decreasing, leading to increasingly deteriorated heat exchange in the intermediate-pressure system. The two traditional intermediate-pressure economizer arrangement methods listed above can no longer meet the requirements and have the following drawbacks:

[0004] 1. Modular limitation: The medium-pressure economizer is arranged separately or in parallel with the high-pressure economizer. The number of horizontal rows of the heating surface is fixed. Although the number of vertical rows can be adjusted, it is difficult to adjust flexibly. This results in insufficient control accuracy of node temperature and proximity point temperature, which affects the cascade utilization of waste heat.

[0005] 2. Large space occupation: Independent headers and modules require additional space, increasing the overall size of the boiler and manufacturing costs.

[0006] 3. Uneven heat exchange: If the medium-pressure economizer is arranged separately, it may occupy the high-efficiency heat exchange area and affect the heat exchange of other modules. If it is arranged in parallel with the high-pressure economizer, the heat exchange capacity may be significantly different from that of the high-pressure economizer, resulting in uneven flue gas temperature after heat exchange and affecting the heat exchange of subsequent modules. Utility Model Content

[0007] In view of the shortcomings of the existing technology, this utility model designs a new type of gas turbine waste heat boiler header to solve the problems mentioned in the background technology.

[0008] The present invention adopts the following technical solution:

[0009] A novel header for a gas turbine waste heat boiler includes a header body, which is divided into a left header cylinder and a right header cylinder by a central partition, forming independent high-pressure chamber and medium-pressure chamber to ensure no mixing of the working fluid. The high-pressure chamber and the medium-pressure chamber are respectively connected to the heat-receiving tube bundles of the high-pressure economizer and the medium-pressure economizer. The left header cylinder and the right header cylinder are on the same axis, which is the center line of the header.

[0010] Preferably, a header end cap is connected to the left end of the left cylinder of the header and the right end of the right cylinder of the header.

[0011] Preferably, a first connecting hole is provided on the upper part of the left cylinder of the header, the first connecting hole is parallel to the center line of the header, and a header pipe connector one is connected to the first connecting hole, the header pipe connector one being connected to an external system pipeline; a second connecting hole is provided on the upper part of the right cylinder of the header, the second connecting hole is parallel to the center line of the header, and a header pipe connector two is connected to the second connecting hole, the header pipe connector two being connected to an external system pipeline.

[0012] Preferably, the upper part of the left cylinder and the upper part of the right cylinder of the header are respectively connected to the header lifting lugs perpendicular to the center line of the header, and the header lifting lugs are respectively connected to the hanging device and fixed on the boiler body.

[0013] Preferably, the lower part of the left cylinder of the header, parallel to the center line of the header, has one or more rows of third connecting holes, which are connected to header small pipe joints or heating surface pipes to form a pipe screen type; the lower part of the right cylinder of the header, parallel to the center line of the header, has one or more rows of fourth connecting holes, which are connected to header small pipe joints or heating surface pipes to form a pipe screen type.

[0014] Preferably, the partition plate is welded and sealed to the left and right cylinders of the header, and the other end of the header is welded and sealed to the end cover, all using a full-penetration weld structure. Furthermore, the thickness of the partition plate has been verified through strength calculations to ensure that the working fluid in the left and right chambers of the header does not mix or leak under high pressure.

[0015] Preferably, the heat exchange surface tube bundles of the high-pressure economizer and the medium-pressure economizer are arranged laterally side by side in the same flue area to form a continuous heat exchange surface.

[0016] The beneficial effects of this utility model are: (1) By using the shared header and partition technology, the heating surfaces of the high-pressure and medium-pressure economizers are compactly integrated, breaking through the limitations of modular design; (2) The number of horizontal rows of the medium-pressure economizer tube bundle can be dynamically adjusted, accurately matching flue gas parameters, accurately controlling the node and proximity point temperatures, and improving the waste heat recovery efficiency; (3) The modular design takes into account both sealing and maintainability, reducing the total life cycle cost. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a conventional solution using existing technology.

[0018] Figure 2 This is a structural schematic diagram of a novel header provided in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram showing the unfolded cylinder of a novel header according to an embodiment of this application.

[0020] Figure 4 This application provides a slope diagram of a novel header splice in one embodiment, showing the high-pressure chamber and the medium-pressure chamber separated by a partition.

[0021] Reference numerals in the attached drawings: 1. Left cylinder of the header; 2. Right cylinder of the header; 3. Pipe joint 1 of the header; 4. Pipe joint 2 of the header; 5. End cover of the header; 6. Middle partition plate; 7. Ear plate of the header; 11. First connecting hole; 21. Second connecting hole; 12. Third connecting hole; 22. Fourth connecting hole. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0023] Example: Figures 2 to 4As shown, a novel header for a gas turbine waste heat boiler includes a left header body 1 and a right header body 2. The left header body 1 and the right header body 2 are located on the same axis, which is the center line of the header. The left header body 1 and the right header body 2 are connected and fixed by a partition plate 6. The thickness of the partition plate 6 has been verified through strength calculations to ensure that the working fluid in the left and right chambers of the header does not mix or leak under high pressure. The other end of the left header body 1 and the right header body 2 is welded to the end cover 5 for sealing, both using a full-penetration weld structure to ensure no leakage under high pressure. The upper part of the left cylinder 1 of the header is provided with a first connecting hole 11, which is parallel to the center line of the header. A header pipe connector 3 is connected to the first connecting hole 11, and the header pipe connector 3 is connected to the external system pipeline. The upper part of the right cylinder 2 of the header is provided with a second connecting hole 21, which is parallel to the center line of the header. A header pipe connector 4 is connected to the second connecting hole 21, and the header pipe connector 4 is connected to the external system pipeline. After the header is divided into two systems, the heat exchange of each system is ensured to proceed smoothly through pipe connectors of different sizes. The upper parts of the left cylinder 1 and the right cylinder 2 of the header are respectively connected to header lifting lugs 7, which are connected to a hanging device, which is fixed to the boiler body. Since the header is welded into a whole by the middle partition 6, the entire module can be hung and fixed by a conventional hanging device. A header end cover 5 is connected to the left end of the left cylinder and the right end of the right cylinder.

[0024] In this embodiment, the header body is divided into a left header cylinder 1 and a right header cylinder 2 by a partition 6. The two chambers are respectively connected to the heating surface tubes of the high-pressure economizer and the medium-pressure economizer. While ensuring that the total length of the header and the number of tubes in a single row of the header remain unchanged, the number of tube rows of the high-pressure and medium-pressure economizers can be adjusted to each other, which can better match the flue gas parameters under different operating conditions and loads, accurately control the near-point temperature of the economizer, and improve the efficiency of the waste heat boiler heating surface.

[0025] like Figures 2 to 4 As shown in the embodiments of this application, the lower parts of the left header 1 and the right header 2, parallel to the center line of the header, have a row of third connecting holes 12 and fourth connecting holes 22. These third connecting holes 12 and fourth connecting holes 22 can connect to header small pipe joints or heated surface pipes, and can be combined into a single-pipe panel or large module structure through socket welding or full penetration welding. If necessary, the lower part of the header can have two or more rows of connecting holes to connect two or more rows of heated surface pipes to meet performance design and other related requirements.

[0026] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A novel header for a gas turbine waste heat boiler, comprising a header body, characterized in that, The header body is divided into a left header cylinder and a right header cylinder by a middle partition, forming an independent high-pressure chamber and a medium-pressure chamber. The high-pressure chamber and the medium-pressure chamber are respectively connected to the heating surface tube bundles of the high-pressure economizer and the medium-pressure economizer. The left header cylinder and the right header cylinder are on the same axis, which is the center line of the header.

2. The novel gas turbine waste heat boiler header according to claim 1, characterized in that, The left end of the left cylinder of the header and the right end of the right cylinder of the header are each connected to a header end cap.

3. A novel gas turbine waste heat boiler header according to claim 1, characterized in that, The upper part of the left cylinder of the header is provided with a first connecting hole, which is parallel to the center line of the header. A header pipe connector one is connected to the first connecting hole, and the header pipe connector one is connected to an external system pipeline. The upper part of the right cylinder of the header is provided with a second connecting hole, which is parallel to the center line of the header. A header pipe connector two is connected to the second connecting hole, and the header pipe connector two is connected to an external system pipeline.

4. A novel gas turbine waste heat boiler header according to claim 1, characterized in that, The upper parts of the left and right cylinders of the header are respectively connected to header lifting lugs perpendicular to the center line of the header. The header lifting lugs are respectively connected to the hanging device and fixed to the boiler body.

5. A novel gas turbine waste heat boiler header according to claim 1, characterized in that, The lower part of the left cylinder of the header, parallel to the center line of the header, has one or more rows of third connecting holes. The third connecting holes are connected to header small pipe joints or heating surface pipes to form a pipe screen type. The lower part of the right cylinder of the header, parallel to the center line of the header, has one or more rows of fourth connecting holes. The fourth connecting holes are connected to header small pipe joints or heating surface pipes to form a pipe screen type.

6. A novel gas turbine waste heat boiler header according to claim 1, characterized in that, The central partition is welded and sealed to the left and right cylinders of the header, and the other end of the header is welded and sealed to the end cover, all of which adopt a full-penetration weld structure.

7. A novel gas turbine waste heat boiler header according to claim 1, characterized in that, The heat exchange surface tube bundles of the high-pressure economizer and the medium-pressure economizer are arranged horizontally side by side in the same flue area to form a continuous heat exchange surface.

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