Steam waste heat recovery equipment of steam turbine

Abstract

The invention relates to the technical field of steam turbines, in particular to steam waste heat recovery equipment of a steam turbine, which comprises a recovery box arranged at an exhaust port of the steam turbine, an exhaust box is arranged in the recovery box, and the exhaust box is communicated with the exhaust port of the steam turbine through a connecting pipe. Therefore, the dynamic compensation effect is formed, it is guaranteed that the steam pressure in the exhaust box is stable, damage to equipment caused by thermal stress and mechanical stress is avoided, meanwhile, the expanded compensation heat conduction cover is matched with the surface of the exhaust box, and the purpose of increasing the heat exchange area of steam waste heat is further achieved. And meanwhile, the steam discharge pipe on the rotary connector rotates synchronously, so that steam sprayed out of the steam discharge outlet can form disturbance jet flow in the exhaust box in the rotating state, a continuous jet flow washing effect is further formed on the inner surface of the exhaust box, impurities and scales attached to the inner surface of the exhaust box are removed, and the good heat transfer performance of the equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a steam waste heat recovery device for a steam turbine. Background Art

[0002] During the operation of the steam turbine, a large amount of steam is generated. The steam contains reusable waste heat resources. In order to reduce energy waste and reduce operating costs, the waste heat can be converted into useful thermal energy or electrical energy through waste heat recovery, thereby realizing multiple utilization of energy. The existing waste heat recovery technology usually supplies circulating cooling water to the steam discharge path, and the heat absorption of the exhaust gas is realized by heat exchange between the exhaust gas and the cooling water.

[0003] For example, the Chinese patent application number CN202110860284.1 discloses a steam turbine for recovering waste heat from a steam boiler, which is connected by fixing a connecting ring on the top surface of a vertical tube, and opening a connecting groove on the top surface of the connecting ring to communicate with the annular cavity inside the connecting ring, so that the top surface of the connecting ring is fixedly connected with a cooling outer ring and a cooling inner ring located on both sides of the connecting ring, and a side groove is opened on the side of the cooling inner ring, so that the side groove is connected to the expansion sleeve, which expands the cooling water circulation area while increasing the heat exchange area between the exhaust gas and the cooling water, improves the heat exchange efficiency of the exhaust gas, and improves the waste heat utilization effect of the steam turbine. However, the expansion sleeve only has the effect of expanding the area of ​​the cooling inner ring, but does not take into account the problem of steam flow rate. Once the steam flow rate is accelerated, the steam flow area farther from the inner surface of the cooling inner ring cannot complete the effective recovery of waste heat under fast flow rate conditions, and the steam with waste heat will also be affected by thermal expansion in the cooling ring with a fixed area, and the resulting thermal stress and mechanical stress will cause certain damage to the steam turbine. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a steam waste heat recovery device for a steam turbine to solve the technical problems in the prior art that when the steam flow rate is accelerated, the steam flow area farther away from the inner surface of the cooling inner ring cannot effectively recover the waste heat under fast flow rate conditions, and the steam with waste heat will also be affected by thermal expansion in the cooling ring with a fixed area, and the thermal stress and mechanical stress generated will cause damage to the steam turbine.

[0005] Based on the above purpose, the present invention provides a steam waste heat recovery device for a steam turbine, comprising a recovery box arranged at the exhaust port of the steam turbine, an exhaust box arranged in the recovery box, the exhaust box being connected to the exhaust port of the steam turbine through a connecting pipe, an air outlet pipe being arranged on the other side of the exhaust box through the connecting pipe, a water inlet and a water outlet being arranged on both sides of the recovery box, a protruding port being opened in a circumferential direction on the exhaust box, and the waste heat recovery device further comprising: A sliding seat, the sliding seat being slidably disposed on the connecting pipe; A steam exhaust pipe, the steam exhaust pipe is placed in the exhaust box and is connected to the connecting pipe; A connecting assembly for connecting the sliding seat and the steam exhaust pipe; A compensating heat-conducting cover, wherein the compensating heat-conducting cover is sealably and telescopically arranged in the extension opening; A transmission assembly for connecting the sliding seat and the compensating heat-conducting cover.

[0006] Furthermore, the connection component includes: A rotating connector, the middle part of which is a cavity structure, and a communication port is circumferentially arranged at one end, the steam exhaust pipe is installed between two oppositely arranged communication ports, and the rotating connector is rotatably installed on the connecting pipe; A transmission sleeve is arranged on the other side of the rotating connector, a positive rotation guide groove is arranged on the transmission sleeve, and the sliding seat is arranged in the positive rotation guide groove through a ball.

[0007] Furthermore, there are a plurality of steam exhaust pipes, and the plurality of steam exhaust pipes are respectively arranged in an annular direction on the rotating connector.

[0008] Furthermore, the surface of the steam exhaust pipe is uniformly distributed with exhaust outlets, and the exhaust outlets are all obliquely arranged on the steam exhaust pipe and face the inner surface of the exhaust box.

[0009] Furthermore, the transmission assembly includes: A connecting rod, one end of which is hinged to the sliding seat; A slider, the slider being hinged to the other end of the connecting rod; An adjusting plate, wherein a sliding rod is provided at the end of the adjusting plate, and the sliding block is slidably arranged on the sliding rod; A connecting seat, the connecting seat is mounted on the adjusting plate; A telescopic plate, wherein the telescopic plate is movably arranged in the connecting seat, a push-pull rod is hinged at the lower end of the telescopic plate, and the other end of the push-pull rod is hinged to the slider; A tension spring, one end of which is connected to the lower end of the telescopic plate, and the other end of which is connected to the hollow inner cavity of the connecting seat; The compensating heat-conducting cover is installed at the end of the telescopic plate.

[0010] Furthermore, extension sections are provided at both ends of the connection seat, and the extension sections are embedded in the edge area of ​​the extension opening to form a reinforced sealing environment.

[0011] Furthermore, a fixing groove is also provided on the adjustment plate, and the connecting seat is adjustably installed in the fixing groove by means of bolts.

[0012] Furthermore, the upper and lower surfaces of the compensating heat-conducting cover are both wavy structures, and the exhaust box and the compensating heat-conducting cover are both made of heat-conducting materials.

[0013] Furthermore, a sewage valve is provided at the bottom of the recovery box.

[0014] Furthermore, a buffer plate is slidably provided between the connecting pipe and the sliding seat, and a buffer block is provided at a side end of the buffer plate.

[0015] The beneficial effects of the present invention are as follows: a steam waste heat recovery device for a steam turbine of the present invention can be used. When in use, the extension degree of the compensation heat-conducting hood from the extension port can be different according to the flow rate, so as to form a dynamic compensation effect, ensure the stability of the steam pressure inside the exhaust box, and avoid damage to the equipment caused by thermal stress and mechanical stress. At the same time, the expanded compensation heat-conducting hood cooperates with the surface of the exhaust box to further achieve the purpose of increasing the heat exchange area of ​​the steam waste heat. At the same time, the steam exhaust pipe on the rotating connector is rotated synchronously. This rotational state can make the steam ejected from the exhaust outlet form a disturbed jet in the exhaust box, thereby forming a continuous jet flushing effect on the inner surface of the exhaust box, removing impurities and scaling attached to the inner surface of the exhaust box, and ensuring good heat transfer performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or 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 in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the internal structure of the present invention; Figure 2 It is a schematic diagram of the external structure of the present invention; Figure 3 It is a schematic diagram of the assembly of the transmission component and the connection component in the present invention; Figure 4 It is a schematic diagram of the structure of the exhaust box in the present invention; Figure 5 It is a schematic diagram of the assembly of some structures in the present invention; Figure 6 It is a partial assembly schematic diagram of some structures in the present invention; Figure 7 It is a schematic diagram of assembling the telescopic plate and the compensating heat-conducting cover in the present invention; Figure 8 It is a schematic diagram of the assembly of the buffer plate and the connecting pipe in the present invention; Fig. 9It is a schematic diagram of the internal structure of another part of the structure in the present invention.

[0018] The markings in the figure are: 1. Steam turbine exhaust port; 2. Recovery box; 3. Exhaust box; 4. Pipe connection; 5. Water inlet; 6. Water outlet; 7. Extension port; 8. Sliding seat; 9. Buffer plate; 10. Rotating connector; 11. Transmission sleeve; 12. Steam discharge pipe; 13. Exhaust outlet; 14. Connecting rod; 15. Adjusting plate; 16. Fixed groove; 17. Connecting seat; 18. Telescopic plate; 19. Tension spring; 20. Compensating heat-conducting cover; 21. Extension section; 22. Push-pull rod; 23. Sliding block; 24. Sewage valve. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In a first aspect of the present invention, a steam waste heat recovery device for a steam turbine is provided, such as Figure 1-9 As shown, it includes a recovery box 2 arranged at the exhaust port 1 of the steam turbine, an exhaust box 3 is arranged in the recovery box 2, the exhaust box 3 is connected to the exhaust port 1 of the steam turbine through a connecting pipe 4, an air outlet pipe is arranged on the other side of the exhaust box 3 through the connecting pipe 4, a water inlet 5 and a water outlet 6 are arranged on both sides of the recovery box 2, and a protruding port 7 is opened in a circumferential direction on the exhaust box 3. The waste heat recovery equipment also includes: A sliding seat 8 is slidably disposed on the pipe 4; A steam exhaust pipe 12, which is placed in the exhaust box 3 and connected to the connecting pipe 4; A connecting assembly for connecting the sliding seat 8 and the steam exhaust pipe 12; A compensating heat-conducting cover 20, which is sealed and retractably arranged in the extension opening 7; A transmission component for connecting the sliding seat 8 and the compensating heat-conducting cover 20.

[0022] In this embodiment, the connection component includes: The rotating connector 10 has a hollow structure in the middle and a connecting port is provided in a circumferential direction at one end. The steam discharge pipe 12 is installed between two oppositely arranged connecting ports. The rotating connector 10 is installed on the connecting pipe 4. The transmission sleeve 11 is arranged on the other side of the rotating connector 10. The transmission sleeve 11 is provided with a positive rotation guide groove, and the sliding seat 8 is arranged in the positive rotation guide groove through a ball.

[0023] In this embodiment, the transmission assembly includes: A connecting rod 14, one end of which is hinged on the sliding seat 8; A slider 23, the slider 23 is hinged to the other end of the connecting rod 14; An adjusting plate 15, wherein a sliding rod is provided at the end of the adjusting plate 15, and a slider 23 is slidably arranged on the sliding rod; A connecting seat 17, wherein the connecting seat 17 is mounted on the adjusting plate 15; The telescopic plate 18 is movably disposed in the connecting seat 17, and a push-pull rod 22 is hinged at the lower end of the telescopic plate 18, and the other end of the push-pull rod 22 is hinged to the slider 23; A tension spring 19, one end of which is connected to the lower end of the telescopic plate 18, and the other end of which is connected to the hollow inner cavity of the connecting seat 17; The compensating heat-conducting cover 20 is installed at the end of the telescopic plate 18 .

[0024] In this embodiment, when in use, steam is discharged into the steam waste heat recovery device through the turbine exhaust port 1 via the connecting pipe 4, and the steam enters each steam discharge pipe 12 through the middle cavity structure of the rotating connector 10, and the steam is then transported to the exhaust box 3 through the exhaust outlet 13 on the steam discharge pipe 12, and cooling water is supplied to the water inlet 5 at the same time, and the cooling water flow is filled in the gap between the recovery box 2 and the exhaust box 3, and the heat in the steam is conducted to the cooling water between the recovery box 2 and the exhaust box 3 to be recovered; When the steam flow rate is fast and cannot be discharged quickly in a short time, a large amount of steam will quickly accumulate in the exhaust box 3, forming a strong positive air pressure in the exhaust box 3. Under the supporting effect of the air pressure, a plurality of telescopic plates 18 movably arranged in the connecting seat 17 will be pushed out at the same time, and the plurality of telescopic plates 18 respectively drive their corresponding compensating heat-conducting covers 20 to expand and extend from the extension opening 7 on the exhaust box 3, thereby expanding the size of the steam storage space in the exhaust box 3. In this process, under the tension of the tension spring 19, the extension degree of the telescopic plate 18 can be controlled. The greater the steam pressure inside the exhaust box 3, the greater the expansion degree of the compensation heat-conducting cover 20 from the extension port 7 on the exhaust box 3, and vice versa. It is achieved that the extension degree of the compensation heat-conducting cover 20 from the extension port 7 can be different according to the flow rate, thereby forming a dynamic compensation effect, ensuring the stability of the steam pressure inside the exhaust box 3, avoiding thermal stress and mechanical stress from causing damage to the equipment, and at the same time, the expanded compensation heat-conducting cover 20 increases the contact area between the cooling water flow and the steam inside the exhaust box 3, further achieving the purpose of increasing the heat exchange area of ​​the steam waste heat; During the extension of the telescopic plate 18, the push-pull rod 22 is also driven to move, and then the slider 23 hinged to the lower end of the push-pull rod 22 is driven to slide on the slider, and then the sliding seat 8 is driven to slide on the connecting rod 4 through the connecting rod 14. Since the transmission sleeve 11 is provided with a positive rotation guide groove, the ball on the sliding seat 8 cooperates with the positive rotation guide groove on the transmission sleeve 11, so that the rotating connector 10 can be rotated on the connecting pipe 4, and a connecting port is circumferentially arranged at one end of the rotating connector 10, and the steam exhaust pipe 12 is installed between the two relatively arranged connecting ports. The rotation of the rotating connector 10 will drive the multiple steam exhaust pipes 12 installed on the rotating connector 10 to rotate synchronously. The synchronous rotation of the multiple steam exhaust pipes 12 can make the steam ejected from the exhaust outlet 13 form a disturbed multi-beam jet in the exhaust box 3, and then form a continuous jet flushing effect on the inner surface of the exhaust box 3, remove impurities and scaling attached to the inner surface of the exhaust box 3, and reduce the maintenance frequency, so as to ensure the good heat transfer performance of the equipment; When the steam flow rate returns to a slower state, the telescopic plate 18 is reset and retracted under the elastic tension of the tension spring 19. At this time, the tension spring 19 is hidden in the connecting seat 17 to avoid corrosion caused by long-term contact with steam and affect the elastic effect. Finally, the steam after waste heat recovery is discharged through the exhaust pipe, and the hot water after heat transfer is discharged through the water outlet 6.

[0025] In this embodiment, if Figure 1 , Figure 3 As shown, there are several steam exhaust pipes 12, and the several steam exhaust pipes 12 are respectively arranged in an annular direction on the rotating connecting head 10, so that the ejected steam jet can not only clean the impurities and scale attached to the inner surface of the exhaust box 3, but also overlap with each other in the gap area between the several steam exhaust pipes 12, so as to enhance the uniformity of steam diffusion in the exhaust box 3 and improve the waste heat transfer effect.

[0026] In this embodiment, if Figure 1 , Figure 3As shown, the surface of the steam exhaust pipe 12 is evenly distributed with exhaust outlets 13, and the exhaust outlets 13 are all obliquely arranged on the steam exhaust pipe 12 and face the inner surface of the exhaust box 3, so that the steam jet can be obliquely sprayed along the exhaust outlet 13, and can cover all the inner surfaces of the exhaust box 3, avoiding the steam jet directly hitting the inner surface of the exhaust box 3, causing the inner wall of the exhaust box 3 to show striped scaling, thereby ensuring the cleaning effect of the inner surface of the exhaust box 3.

[0027] In this embodiment, if Figure 5 , Figure 6 As shown, extension sections 21 are provided at both ends of the connection seat 17, and the extension sections 21 are embedded in the edge area of ​​the extension port 7 to form a reinforced sealing environment to prevent leakage gaps from appearing in the edge area of ​​the connection seat 17 and the extension port 7 when the waste heat recovery equipment is used for a long time, causing steam to directly leak into the cooling water flow gap between the recovery box 2 and the exhaust box 3, seriously affecting the recovery effect of the steam waste heat.

[0028] In this embodiment, if Figure 5 , Figure 6 As shown, a fixing groove 16 is also provided on the adjustment plate 15, and the connecting seat 17 is adjustably installed in the fixing groove 16 by means of bolts. The installation position of the connecting seat 17 in the fixing groove 16 is adjusted accordingly by loosening and tightening the bolts, so as to adjust the embedding position of the two end extension sections 21 on the connecting seat 17 at the extension port 7, which is convenient for replacement and maintenance.

[0029] In this embodiment, if Figure 1 , Figure 3 As shown, the upper and lower surfaces of the compensating heat-conductive cover 20 are both wavy structures, and the exhaust box 3 and the compensating heat-conductive cover 20 are both made of heat-conductive materials. The compensating heat-conductive cover 20 with wavy structures on the upper and lower surfaces can further increase the effective contact area between the waste heat steam and the cooling water, and can be sprayed obliquely along the exhaust outlet 13 in conjunction with the steam jet. Even if the wavy structures on the upper and lower surfaces of the compensating heat-conductive cover 20 are prone to scaling, a better cleaning effect can still be achieved on the inner surface of the exhaust box 3 under the coverage of the obliquely sprayed steam jet.

[0030] In this embodiment, if Figure 2 As shown, a sewage valve 24 is provided at the bottom of the recovery box 2. When the recovery box 2 is not used for a long time, the stored cooling water can be discharged through the sewage valve 24 to avoid rust.

[0031] In this embodiment, if Figure 1 As shown, a buffer plate 9 is slidably provided between the pipe 4 and the sliding seat 8, and a buffer block is provided at the side end of the buffer plate 9. The buffer blocks on the buffer plate 9 abut against the inner walls on both sides of the exhaust box 3 to buffer the influence of sudden changes in air pressure on the strength of the exhaust box 3.

[0032] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention, including the claims, is limited to these examples; within the spirit of the present invention, the technical features in the above embodiments or in different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the above aspects of the present invention, which are not provided in detail for the sake of simplicity.

[0033] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steam waste heat recovery device for a steam turbine, comprising a recovery box (2) arranged at an exhaust port (1) of the steam turbine, an exhaust box (3) arranged inside the recovery box (2), the exhaust box (3) being connected to the exhaust port (1) of the steam turbine via a connecting pipe (4), an air outlet pipe being arranged on the other side of the exhaust box (3) via the connecting pipe (4), a water inlet (5) and a water outlet (6) being arranged on both sides of the recovery box (2), characterized in that: The exhaust box (3) is provided with a protruding opening (7) in a circular direction, and the waste heat recovery device further comprises: A sliding seat (8), the sliding seat (8) being slidably disposed on the connecting pipe (4); a steam exhaust pipe (12), the steam exhaust pipe (12) being disposed in the exhaust box (3) and being connected to the connecting pipe (4); A connecting assembly for connecting the sliding seat (8) and the steam exhaust pipe (12); A compensating heat-conducting cover (20), the compensating heat-conducting cover (20) being sealed and telescopically arranged in the extension opening (7); A transmission component used for connecting the sliding seat (8) and the compensating heat-conducting cover (20).

2. The steam waste heat recovery device for a steam turbine according to claim 1, characterized in that: The connection component comprises: A rotating connector (10), wherein the middle portion of the rotating connector (10) is a hollow structure, and a communication port is provided in a circumferential direction at one end portion of the rotating connector, the steam exhaust pipe (12) is installed between two communication ports arranged opposite to each other, and the rotating connector (10) is installed on the connecting pipe (4); A transmission sleeve (11), the transmission sleeve (11) being arranged on the other side of the rotating connector (10), the transmission sleeve (11) being provided with a positive rotation guide groove, and the sliding seat (8) being arranged in the positive rotation guide groove via a ball.

3. The steam waste heat recovery device for a steam turbine according to claim 2, characterized in that: There are a plurality of steam exhaust pipes (12), and the plurality of steam exhaust pipes (12) are respectively arranged in an annular direction on the rotating connector (10).

4. The steam waste heat recovery device for a steam turbine according to claim 2, characterized in that: The surface of the steam exhaust pipe (12) is uniformly distributed with exhaust outlets (13); the exhaust outlets (13) are all arranged obliquely on the steam exhaust pipe (12) and face the inner surface of the exhaust box (3).

5. The steam waste heat recovery device for a steam turbine according to claim 1, characterized in that: The transmission assembly comprises: A connecting rod (14), one end of the connecting rod (14) being hinged to the sliding seat (8); A slider (23), the slider (23) being hinged to the other end of the connecting rod (14); An adjustment plate (15), wherein a sliding rod is provided at an end of the adjustment plate (15), and the sliding block (23) is slidably arranged on the sliding rod; A connecting seat (17), wherein the connecting seat (17) is mounted on the adjusting plate (15); a telescopic plate (18), the telescopic plate (18) being movably disposed in the connecting seat (17) with a gap, a push-pull rod (22) being hingedly connected at the lower end of the telescopic plate (18), and the other end of the push-pull rod (22) being hingedly connected to the sliding block (23); A tension spring (19), one end of the tension spring (19) being connected to the lower end of the telescopic plate (18), and the other end of the tension spring (19) being connected to the hollow inner cavity of the connecting seat (17); The compensating heat-conducting cover (20) is installed at the end of the telescopic plate (18).

6. The steam waste heat recovery device for a steam turbine according to claim 5, characterized in that: Protruding sections (21) are provided at both ends of the connection seat (17), and the protruding sections (21) are embedded in the edge area of ​​the protruding opening (7) to form a reinforced sealing environment.

7. The steam waste heat recovery device for a steam turbine according to claim 5, characterized in that: A fixing groove (16) is also provided on the adjustment plate (15), and the connection seat (17) is adjustably mounted in the fixing groove (16) by means of bolts.

8. The steam waste heat recovery device for a steam turbine according to claim 1, characterized in that: The upper and lower surfaces of the compensating heat-conducting cover (20) are both wavy structures, and the exhaust box (3) and the compensating heat-conducting cover (20) are both made of heat-conducting materials.

9. The steam waste heat recovery device for a steam turbine according to claim 1, characterized in that: A sewage valve (24) is provided at the bottom of the recovery box (2).

10. The steam waste heat recovery device for a steam turbine according to claim 1, characterized in that: A buffer plate (9) is slidably provided between the connecting pipe (4) and the sliding seat (8), and a buffer block is provided at the side end of the buffer plate (9).

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