A gas turbine combined cycle vacuum system

Abstract

The application provides a gas turbine combined cycle vacuum system, and relates to the technical field of turbine vacuum systems, which comprises a condenser, a vacuum pump and a condenser. The vacuum pump is arranged between the condenser and the condenser and is used for vacuumizing the condenser and pumping residual steam in the condenser to the condenser for condensation treatment. The condenser is composed of a condenser shell, two conical plugs and a plurality of condensing pipes uniformly arranged in the condenser shell. The conical plug is fixedly provided with a pressure plate protruding from the inside thereof, the pressure plate is inserted into the end space of the condenser shell, and the two ends of the condensing pipe are respectively penetrated and matched with the two pressure plates. The application can avoid disassembling and opening the conical plug to maintain the condensing pipe, so that the condensing pipe is separated from the pressure plate and lost from the condenser shell due to the opening of the conical plug, thereby causing unnecessary trouble.

Description

Technical Field

[0001] This invention relates to the field of steam turbine vacuum system technology, and more particularly to a combined cycle vacuum system for gas turbines. Background Technology

[0002] The circulating vacuum system is the "vacuum guarantee backing" of the steam turbine. The exhaust steam after the steam turbine has done its work needs to be cooled and condensed into water in the condenser for recycling. The vacuum environment allows the exhaust steam to condense at a lower temperature, reducing energy loss. The stability of the vacuum directly determines the operating efficiency and reliability of the unit.

[0003] In existing circulating vacuum systems, some condensers, in order to facilitate the disassembly, maintenance, or replacement of their internal condenser tubes, generally do not have a dedicated positioning component for the condenser tubes. They are usually positioned by the end covers of the condenser. However, these condensers often lack a mechanism to provide auxiliary limiting for the condenser tubes. As a result, when the end covers are opened and the condenser tubes are not disassembled for maintenance, but other components are being repaired, the condenser tubes may lose their positioning due to the open end covers and slide directly out of the condenser, causing unnecessary trouble. Summary of the Invention

[0004] In view of this, the present invention provides a combined cycle vacuum system for gas turbines to solve the problem that when the end cover is opened and the condenser tubes are not disassembled for maintenance, but other components are being repaired, the condenser tubes will lose their positioning due to the opening of the cover plate, resulting in unnecessary disassembly and separation from the condenser.

[0005] The technical solution proposed in this invention is as follows: a combined cycle vacuum system for a gas turbine, specifically including a condenser, a vacuum pump, and a condenser. The vacuum pump is located between the condenser and the condenser, used to evacuate the condenser and pump the residual exhaust steam inside the condenser to the condenser for condensation. The condenser consists of a condenser shell, two conical plugs, and a number of condenser tubes evenly distributed inside the condenser shell. A pressure plate protruding from the conical plug is fixedly installed on it, and the pressure plate is inserted into the end space of the condenser shell. The two ends of the condenser tubes are respectively connected to... Two pressure plates are connected through each other; two limiting rings are symmetrically fixed to the inner circumference of the condenser shell; two sealing pressure rings and two sets of limiting rings are symmetrically fixed to the outer circumference of the condenser tube; the pressure plate abuts against the limiting rings, and the sealing pressure ring abuts against the pressure plate; two retaining plates are symmetrically fixed to the inner circumference of the condenser, and the retaining plates have evenly distributed through holes. Multiple arched spring pieces are fixed around the inner circumference of the through holes. The limiting rings are arranged in pairs, and the diameters of the limiting rings and the sealing pressure rings are smaller than the through holes; the arched spring pieces are located between the two groups of limiting rings and abut against the two limiting rings.

[0006] Furthermore, exhaust steam inlet pipe and water outlet pipe are welded to both ends of the bottom of the condenser shell, and the conical plug on the lower side is connected to the water outlet pipe through a pipe.

[0007] Furthermore, cooling water outlet pipes and cooling water return pipes are welded to the upper and lower ends of the outer periphery of the condenser shell, respectively.

[0008] Furthermore, it also includes a circulating pump, whose pumping pipe is connected to the cooling water outlet pipe.

[0009] Furthermore, it also includes an air-cooled radiator, which is connected in series in the return water passage established between the drain pipe of the circulating pump and the return pipe of the cooling water.

[0010] Furthermore, multiple vertical connecting rods are fixedly connected around the pressure plate and the conical plug.

[0011] Furthermore, a sealing gasket is squeezed and clamped between the sealing ring and the pressure plate.

[0012] Furthermore, a sealing gasket is squeezed and clamped between the limiting ring and the pressure plate.

[0013] Furthermore, the two sealing rings are located on both ends of the condenser tube, and the two sets of limiting rings are located between the two sealing rings; The upper and lower ends of the condenser tube are connected to two conical plugs, respectively.

[0014] Furthermore, the following operating steps are included: ① First, the uncondensed residual exhaust steam inside the condenser is collected by a vacuum pump, and the inside of the condenser is then evacuated. ②. The residual exhaust gas extracted by the vacuum pump is transported into the condenser. After entering the condenser, the residual exhaust gas flows from top to bottom through the upper conical plug, numerous condenser tubes, and the lower conical plug. ③. The condenser is filled with cooling water. When the residual exhaust steam flows through the condenser tubes, it exchanges heat with the cooling water, cools down, and condenses into water droplets. ④. Condensate droplets flow down and collect in the conical plug on the lower side, and are then transported into the condenser outlet pipe and flow back into the condenser's exhaust steam condensate for repeated recycling. ⑤. The circulating pump is used to draw and drive the cooling water circulation, and the air-cooled radiator is used to blow and cool the continuously circulating cooling water so that the cooling water is kept in an effective state of low temperature and heat absorption.

[0015] The gas turbine combined cycle vacuum system provided by this invention has the following beneficial effects: 1. The condenser tube can be positioned using two conical plugs via the pressure plate. This allows the locking and unlocking of the condenser tube to be completed simultaneously when removing and installing the conical plugs for maintenance. This eliminates the need for additional unlocking or locking of the condenser tube, simplifies the disassembly and maintenance process, and improves the convenience of maintenance.

[0016] 2. The space between the two pressure plates inside the condenser shell forms a cooling chamber, which is used to hold cooling water. When the pressure plate and the limiting ring are in contact, the sealing gasket between them can seal the gap between them. When the pressure plate and the sealing ring are in contact, the sealing gasket between them can seal the gap between them. The above two sealing measures can seal and isolate the cooling chamber from the internal space of the conical plug, preventing cooling water from leaking into the conical plug through the above gaps and mixing into the exhaust gas extraction path or the condensate return path.

[0017] Third, the pressure plate is the top sealing component of the cooling chamber. The pressure plate can be used to fix the condenser and to seal the cooling chamber and the conical plug, which has the effect of dual use. This can save the need to configure an additional top sealing component for the cooling chamber, which helps to simplify the structure of the condenser and reduce its cost to a certain extent.

[0018] Fourth, the arched spring clips serve as auxiliary limiting components for the condenser tubes. When the conical plug is removed and opened, the condenser tubes are in an unlocked and loosened state. At this time, the multiple arched spring clips inside the through hole can limit the unlocked condenser tubes within the condenser through the blocking effect of the arched spring clips. Compared with existing technologies, this avoids the need to disassemble and open the conical plug to inspect other parts inside the condenser without maintaining the condenser tubes. In such cases, the condenser tubes may separate from the pressure plate and lose their positioning due to the opening of the conical plug, causing the condenser tubes to slide out of the condenser shell and fall off without the auxiliary limiting components, resulting in unnecessary trouble.

[0019] Fifth, the arched spring has elastic deformation characteristics. Simply pull the condenser tube up or down to drive the limiting ring to slide synchronously. The limiting ring squeezes the arched spring to deform, creating space for the limiting ring to pass through the through hole. This makes it easy and quick to remove and disassemble the condenser tube. This ensures that the arched spring's auxiliary limiting function for the condenser tube will not interfere with or weaken the ease of disassembly of the condenser tube, allowing the two functions to be compatible and work together normally. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0021] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0022] In the attached diagram: Figure 1 A schematic diagram of the entire invention from the right side is shown; Figure 2 A schematic diagram of the entire invention from a left-side perspective is shown; Figure 3 A schematic diagram of the internal structure of the condenser in this invention is shown in half section. Figure 4 A schematic diagram showing the disassembled state of the conical plug in this invention is shown; Figure 5 A schematic diagram of the through-assembly of the condenser tube and the retaining plate in this invention is shown; Figure 6 A schematic diagram of a half-section of the retaining disk in this invention is shown; Figure 7 The present invention is shown Figure 6 Enlarged structural diagram of section A; Figure 8 A schematic diagram of the through hole and the arched spring sheet in this invention is shown.

[0023] List of reference numerals in the attached diagram: 1. Condenser; 101. Exhaust steam inlet pipe; 102. Water outlet pipe; 2. Vacuum pump; 3. Condenser; 301. Conical plug; 302. Pressure plate; 3021. Vertical connecting rod; 303. Limiting ring; 304. Retaining plate; 3041. Through hole; 3042. Arched spring; 305. Condenser tube; 3051. Sealing pressure ring; 3052. Limiting ring; 306. Condenser shell; 307. Cooling water outlet pipe; 308. Cooling water return pipe; 4. Circulating pump; 5. Air-cooled radiator. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] Please refer to Figures 1 to 6 Example 1: This embodiment proposes a combined cycle vacuum system for a gas turbine, including a condenser 1, a vacuum pump 2, and a condenser 3. The vacuum pump 2 is located between the condenser 1 and the condenser 3, and is used to evacuate the condenser 1 and pump the residual exhaust steam inside the condenser 1 to the condenser 3 for condensation. The condenser 3 consists of a condenser shell 306, two conical plugs 301 fixedly installed on the upper and lower openings of the condenser shell 306, and a number of condenser tubes 305 evenly distributed inside the condenser shell 306. A pressure plate 302 protruding from the conical plug 301 is fixedly installed on it, and the pressure plate 302 is inserted into the end space of the condenser shell 306. The two ends of the condenser tubes 305 respectively penetrate and cooperate with the two pressure plates 302. The upper part of the inner circumference of the condenser shell 306... Two limiting rings 303 are symmetrically fixed at both ends of the condenser tube 305; two sealing pressure rings 3051 and two sets of limiting rings 3052 are symmetrically fixed to the outer periphery of the condenser tube 305; the pressure plate 302 abuts against the limiting rings 303, and the sealing pressure rings 3051 abut against the pressure plate 302; two retaining plates 304 are symmetrically fixed to the inner periphery of the condenser 3 between the two limiting rings 303, and the retaining plates 304 are evenly distributed with through holes 3041. Multiple arched spring pieces 3042 are fixed around the inner periphery of the through holes 3041. The limiting rings 3052 are arranged in pairs, and the diameters of the limiting rings 3052 and the sealing pressure rings 3051 are smaller than the through holes 3041; the arched spring pieces 3042 are located between the two groups of limiting rings 3052 and abut against the two limiting rings 3052.

[0026] Preferably, a waste steam inlet pipe 101 and a water outlet pipe 102 are welded to the two ends of the bottom of the condenser 1 shell, and the conical plug 301 on the lower side is connected to the water outlet pipe 102 through a pipe.

[0027] Preferably, cooling water outlet pipe 307 and cooling water return pipe 308 are welded to the upper and lower ends of the outer periphery of the condenser shell 306, respectively.

[0028] Preferably, it also includes a circulation pump 4, the pumping pipe of which is connected to the cooling water outlet pipe 307.

[0029] Preferably, it also includes an air-cooled radiator 5, which is connected in series in the return water passage established between the drain pipe of the circulating pump 4 and the cooling water return pipe 308.

[0030] Preferably, a plurality of vertical connecting rods 3021 are fixedly connected around the pressure plate 302 and the conical plug 301.

[0031] Preferably, a sealing gasket is squeezed and clamped between the sealing ring 3051 and the pressure plate 302.

[0032] Preferably, a sealing gasket is squeezed and clamped between the limiting ring 303 and the pressure plate 302.

[0033] Preferably, the two sealing rings 3051 are located on both ends of the condenser tube 305, and the two sets of limiting rings 3052 are located between the two sealing rings 3051. The upper and lower ends of the condenser tube 305 are connected to two conical plugs 301, respectively.

[0034] Implementation 2, this embodiment is based on Implementation 1: This embodiment provides a method of use, applied to the gas turbine combined cycle vacuum system described in Embodiment 1, including the following operating steps: ①. First, the uncondensed residual exhaust steam inside the condenser 1 is collected by vacuum pump 2, and the condenser 1 is then evacuated. ②. The residual exhaust vapor extracted by the vacuum pump 2 is transported into the condenser 3. After entering the condenser 3, the residual exhaust vapor flows from top to bottom through the upper conical plug 301, numerous condenser tubes 305 and the lower conical plug 301. ③. The condenser 3 is filled with cooling water. When the residual exhaust steam flows through the condenser tube 305, it exchanges heat with the cooling water through the condenser tube 305 to cool down and condense into water droplets. ④. Condensate droplets flow down and collect in the cone-shaped plug 301 on the lower side, and are then transported into the outlet pipe 102 of the condenser 1 and flow back into the exhaust steam condensate of the condenser 1 for repeated recycling. ⑤. The circulating pump 4 is used to pump and drive the cooling water circulation, and the air-cooled radiator 5 is used to blow and cool the continuously circulating cooling water so that the cooling water is kept in an effective state of low temperature heat absorption.

[0035] The following provides a detailed explanation of the specific details, implementation steps, functions and interrelationships of the features in the above embodiments, and the roles these features play in implementing this technical solution: The high-temperature steam introduced into the gas turbine does work inside the gas turbine to generate low-temperature exhaust steam. The low-temperature exhaust steam is introduced into the condenser 1 for condensation treatment. After the exhaust steam is condensed, it forms condensate. The condensate is introduced into the boiler and reheated to form high-temperature steam for recycling. The exhaust steam enters the condenser 1 through the exhaust steam inlet pipe 101, and the condensate is discharged from the condenser 1 through the outlet pipe 102.

[0036] When the two conical plugs 301 are fixed to the end opening of the condenser 3, the pressure plate 302 and the sealing ring 3051 press against each other, and the condenser tube 305 can be pressed and positioned in the condenser housing 306 by the pressure plate 302. When the two conical plugs 301 are disassembled from the condenser housing 306, the pressure plate 302 and the sealing ring 3051 are separated, which can release the positioning effect on the condenser tube 305. Then, through the pressure plate 302, the condenser tube 305 can be positioned by the two conical plugs 301. This allows the locking and unlocking of the condenser tube 305 to be completed at the same time when the conical plugs 301 are removed for maintenance. This saves the trouble of unlocking or locking the condenser tube 305 separately, which helps to simplify the disassembly and maintenance steps of the condenser tube 305 and improve the convenience of its maintenance.

[0037] The space between the two pressure plates 302 inside the condenser shell 306 forms a cooling chamber, which is used to hold cooling water. When the pressure plate 302 and the limiting ring 303 come into contact, the sealing gasket between them can seal the gap between them. When the pressure plate 302 and the sealing ring 3051 come into contact, the sealing gasket between them can seal the gap between them. The above two sealing measures can seal and isolate the cooling chamber from the internal space of the conical plug 301, preventing cooling water from leaking into the conical plug 301 through the above gaps and mixing into the exhaust gas extraction path or the condensate return path. The pressure plate 302 is a top sealing component for the cooling chamber. The pressure plate 302 can be used to fix the condenser 3 and to seal the cooling chamber and the conical plug 301. It has the effect of dual use, which can save the need to configure an additional top sealing component for the cooling chamber, and helps to simplify the structure of the condenser 3 and reduce its cost to a certain extent.

[0038] The arched spring 3042 is an auxiliary limiting component for the condenser tube 305. When the conical plug 301 is disassembled and opened, the condenser tube 305 is in an unlocked and loosened state. At this time, the multiple arched springs 3042 inside the through hole 3041 can limit the unlocked condenser tube 305 in the condenser 1 through the blocking effect of the arched springs 3042. Compared with the prior art, this can avoid disassembling and opening the conical plug 301 to inspect other parts inside the condenser 3. If the condenser tube 305 is not maintained, it will be separated from the pressure plate 302 and lose its positioning due to the opening of the conical plug 301. This will cause the condenser tube 305 to slide out of the condenser shell 306 and fall off without the auxiliary limiting component, causing unnecessary trouble.

[0039] The arched spring 3042 has elastic deformation characteristics. Simply pull the condenser tube 305 up or down to drive the limiting ring 3052 to slide synchronously. The limiting ring 3052 squeezes the arched spring 3042 to deform, creating space for the limiting ring 3052 to pass through the through hole 3041. This allows for convenient and quick removal and disassembly of the condenser tube 305. This ensures that the auxiliary limiting function of the arched spring 3042 on the condenser tube 305 does not interfere with or weaken the ease of disassembly of the condenser tube 305, allowing the two functions to be compatible and work together normally.

[0040] Working principle: First, the uncondensed residual exhaust steam inside the condenser 1 is drawn and collected by the vacuum pump 2, and the condenser 1 is evacuated. The residual exhaust steam drawn by the vacuum pump 2 is transported into the condenser 3. After entering the condenser 3, the residual exhaust steam flows from top to bottom through the upper conical plug 301, numerous condenser tubes 305, and the lower conical plug 301. The condenser 3 is filled with cooling water. When the residual exhaust steam flows through the condenser tubes 305, it exchanges heat with the cooling water, cools down, and condenses into water droplets. The condensed water droplets flow down and collect in the lower conical plug 301, and are transported into the outlet pipe 102 of the condenser 1 to flow back into the exhaust steam condensate of the condenser 1 for repeated recycling. The circulation pump 4 is used to draw and drive the cooling water circulation, and the air-cooled radiator 5 is used to blow and cool the continuously circulating cooling water to keep the cooling water in an effective state of low temperature heat absorption.

[0041] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0042] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0043] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A combined cycle vacuum system for a gas turbine, comprising a condenser (1), a vacuum pump (2) and a condenser (3), wherein the vacuum pump (2) is disposed between the condenser (1) and the condenser (3) for evacuating the condenser (1) and pumping the residual exhaust steam inside the condenser (1) to the condenser (3) for condensation. Its features are, The condenser (3) is composed of a condenser shell (306), two conical plugs (301), and several condenser tubes (305) evenly distributed inside the condenser shell (306). A pressure plate (302) protruding from the conical plug (301) is fixedly installed on it. The pressure plate (302) is inserted into the end space of the condenser shell (306), and the two ends of the condenser tubes (305) are respectively connected to the two pressure plates (302). Two limiting rings (303) are symmetrically fixed to the inner circumference of the condenser shell (306). Two sealing pressure rings (3051) and two sets of limiting rings (3052) are symmetrically fixed to the outer circumference of the condenser tubes (305). The disc (302) abuts against the limiting ring (303), and the sealing pressure ring (3051) abuts against the pressure disc (302); the condenser (3) has two retaining discs (304) symmetrically fixed to its inner circumference, and the retaining discs (304) have through holes (3041) evenly distributed on them. Multiple arched spring pieces (3042) are fixed around the inner circumference of the through holes (3041). The limiting rings (3052) are arranged in pairs, and the diameters of the limiting rings (3052) and the sealing pressure rings (3051) are smaller than the through holes (3041); the arched spring pieces (3042) are located between the two limiting rings (3052) arranged in pairs, and abut against the two limiting rings (3052).

2. The combined cycle vacuum system for a gas turbine according to claim 1, characterized in that, The condenser (1) has exhaust steam inlet pipe (101) and water outlet pipe (102) welded to the two ends of the bottom of the shell. The conical plug (301) on the lower side is connected to the water outlet pipe (102) through a pipe.

3. The combined cycle vacuum system for a gas turbine according to claim 1, characterized in that, Cooling water outlet pipe (307) and cooling water return pipe (308) are welded to the upper and lower ends of the outer periphery of the condenser shell (306), respectively.

4. A combined cycle vacuum system for a gas turbine according to claim 3, characterized in that, It also includes a circulating pump (4), whose pumping pipe is connected to the cooling water outlet pipe (307).

5. A combined cycle vacuum system for a gas turbine according to claim 4, characterized in that, It also includes an air-cooled radiator (5), which is connected in series in the return water passage between the drain pipe of the circulating pump (4) and the cooling water return pipe (308).

6. A combined cycle vacuum system for a gas turbine according to claim 1, characterized in that, Multiple vertical connecting rods (3021) are fixedly connected around the pressure plate (302) and the conical plug (301).

7. A combined cycle vacuum system for a gas turbine according to claim 1, characterized in that, A sealing gasket is squeezed and clamped between the sealing ring (3051) and the pressure plate (302).

8. A combined cycle vacuum system for a gas turbine according to claim 1, characterized in that, A sealing gasket is squeezed and clamped between the limiting ring (303) and the pressure plate (302).

9. A combined cycle vacuum system for a gas turbine according to claim 1, characterized in that, The two sealing rings (3051) are located on both ends of the condenser tube (305), and the two sets of limiting rings (3052) are located between the two sealing rings (3051); The upper and lower ends of the condenser tube (305) are connected to two conical plugs (301) respectively.

10. A method of use, applied to the combined cycle vacuum system of a gas turbine as described in any one of claims 1 to 9, characterized in that, The following steps are included: ①. First, the uncondensed residual exhaust steam inside the condenser (1) is collected by vacuum pump (2), and the condenser (1) is evacuated. ②. The residual exhaust gas extracted by the vacuum pump (2) is transported into the condenser (3). After entering the condenser (3), the residual exhaust gas flows from top to bottom through the upper conical plug (301), numerous condenser tubes (305) and the lower conical plug (301). ③. The condenser (3) is filled with cooling water. When the residual exhaust steam flows through the condenser tube (305), it exchanges heat with the cooling water through the condenser tube (305) to cool down and condense into water droplets. ④. Condensate droplets flow down and collect in the cone-shaped plug (301) on the lower side, and are transported into the outlet pipe (102) of the condenser (1) and flow back into the exhaust steam condensate of the condenser (1) for repeated recycling. ⑤. The circulating pump (4) is used to pump and drive the cooling water circulation, and the air-cooled radiator (5) is used to blow and cool the continuously circulating cooling water so that the cooling water is kept in an effective state of low temperature heat absorption.

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