Desuperheater for gas turbine generator

Abstract

The desuperheater for the gas turbine generator comprises an outer cylinder and a main cooling pipe, a partition plate is fixedly connected in a cooling groove formed between the outer cylinder and an inner cylinder, the two ends of the inner side face of the inner cylinder are symmetrically connected with the main cooling pipe through a main fixing frame, and the end, close to an air inlet of the inner cylinder, of the main cooling pipe is fixedly connected with an auxiliary block. The main cooling pipe is fixedly connected with one end of a liquid conveying pipe, the other end of the liquid conveying pipe communicates with the outer surface of the outer cylinder, the end, away from the auxiliary block, of the main cooling pipe is symmetrically connected with branch cooling pipes, and the middles of the branch cooling pipes are fixedly connected with an auxiliary fixing frame. Through cooperation of the outer cylinder, the inner cylinder, the partition plates, the main cooling pipe and the branch cooling pipes, the desuperheater can conduct comprehensive desuperheating treatment on high-temperature steam circulating inside, the desuperheating efficiency is improved, and meanwhile the uniformity of temperature change can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbine generator set equipment, in particular to a desuperheater for a gas turbine generator. Background Art

[0002] Combined cycle gas turbines are currently widely used power generation equipment with the advantages of rapid start and stop, energy saving and environmental protection; combined cycle gas turbines have the characteristics of rapid start and stop and load changes, and the steam in the steam pipe often shows signs of overheating, and a water spray desuperheater is usually used to significantly cool the steam; since combined cycle gas power generation units are usually compactly arranged, after the existing water spray desuperheater sprays a large amount of cooling water, the pipes behind the water spray desuperheater are prone to thermal fatigue cracks due to the large temperature difference; at the same time, spraying a large amount of cooling water at one time will lead to poor cooling water atomization effect, further aggravating the generation of thermal fatigue cracks in the pipes behind the desuperheater, thereby reducing the cooling effect on high-temperature and high-pressure steam.

[0003] After searching, a desuperheater for a combined cycle gas turbine generator set disclosed in the prior art (application number: CN202322056893.9) records "an outer cylinder; at least three nozzles, spirally distributed on the outer cylinder along the steam flow direction in the outer cylinder, one end of the nozzle is suitable for connecting to a water supply pipe, and the other end is passed into the outer cylinder, suitable for spraying water into the outer cylinder; a sleeve, sleeved on the periphery of the nozzle, and the sleeve is respectively sealed with the outer wall of the nozzle and the outer cylinder."; The nozzles of the desuperheater are spirally distributed on the outer cylinder along the steam flow direction in the outer cylinder, suitable for spraying water into the outer cylinder, and are spirally distributed on the outer cylinder. At least three nozzles simultaneously spray water to different positions in the outer cylinder to synchronously cool the high-temperature steam in the outer cylinder, thereby achieving uniform and stable cooling of the high-temperature steam and improving the cooling effect; however, the circulation speed of the high-temperature steam in the desuperheater is relatively fast, and the cooling water sprayed by the nozzle will first contact the edge of the high-temperature steam fluid, and then the cooling water can contact the center part of the high-temperature steam fluid. Therefore, when the high-temperature steam fluid flows through the desuperheater quickly, the cooling water cannot fully contact the center part of the high-temperature steam fluid, so the overall cooling effect of the high-temperature steam fluid is poor, and increasing the water spraying amount of the nozzle will easily cause a waste of water resources. Utility Model Content

[0004] In order to overcome the defects of the prior art, a desuperheater for a gas turbine generator is provided to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, a desuperheater for a gas turbine generator is provided, comprising: an outer tube and a main cooling pipe, wherein the outer tube is fixedly connected to the inner tube, and a liquid inlet is provided on the upper surface of one end of the outer tube, and a liquid outlet is provided on the lower surface of the other end of the outer tube, a partition plate is fixedly connected in a cooling groove formed between the outer tube and the inner tube, and two ends of the inner side surface of the inner tube are symmetrically connected to the main cooling pipe through a main fixing frame, and one end of the main cooling pipe close to the air inlet of the inner tube is fixedly connected to an auxiliary block, the main cooling pipe is fixedly connected to one end of a liquid infusion pipe, and the other end of the liquid infusion pipe is connected to the outer surface of the outer tube, and one end of the main cooling pipe away from the auxiliary block is symmetrically connected to a branch cooling pipe, and the middle part of the branch cooling pipe is fixedly connected to a secondary fixing frame.

[0006] Preferably, the outer cylinder and the inner cylinder are both cylindrical structures, and the size of the openings at both ends of the outer cylinder is smaller than the size of the internal cavity of the outer cylinder, while the axial section of the outer cylinder is a [-shaped structure, and the outer diameters at both ends of the inner cylinder are equal to the diameters at both ends of the openings of the outer cylinder.

[0007] Preferably, the partition plate fixedly connected between the outer cylinder and the inner cylinder has a spiral structure, and a group of confluence shells are fixedly connected to the outer surface of the outer cylinder near the liquid inlet and the liquid outlet, respectively, and the cross-section of the confluence shell has a U-shaped structure. At the same time, the confluence shell near the liquid inlet is connected to the water inlet pipe, and the confluence shell near the liquid outlet is connected to the recovery pipe.

[0008] Preferably, there are two groups of total cooling pipes, both groups of total cooling pipes are cylindrical in structure, the axial cross-section of the total cooling pipe is a U-shaped structure, and the auxiliary block is a hemispherical structure. At the same time, the total cooling pipe and the infusion pipe are combined together to form an L-shaped structure, and the infusion pipe is connected to the interior of the corresponding conduit shell.

[0009] Preferably, there are six groups of branch cooling pipes, all of which are in a "J" shape, and both ends of the branch cooling pipes are respectively connected to the inner cavities of the two groups of main cooling pipes, while the main cooling pipes and the branch cooling pipes are combined together to form a "Z" shape structure.

[0010] Preferably, there are two groups of main fixing frames, and each group of main fixing frames consists of a group of fixing rings and four groups of fixing plates, and the fixing rings are in a circular ring structure, and the fixing plates are in a T-shaped structure, and the main fixing frames are in a cross-shaped structure as a whole.

[0011] Preferably, the auxiliary fixing frame is composed of a fixing block, a support plate and a positioning ring, and the fixing block is in a circular ring structure, and the arc surface of the fixing block surrounds six groups of support plates fixedly connected at equal intervals, and the six groups of support plates are all in a rectangular structure. At the same time, one end of the six groups of support plates away from the fixing block is respectively fixedly connected to a group of positioning rings, and the positioning rings are in a circular ring structure.

[0012] Compared with the prior art, the beneficial effect of the utility model is as follows: through the cooperation of the outer cylinder, the inner cylinder and the partition plate, when the high-temperature steam circulates in the desuperheater, the outer side of the high-temperature steam fluid can contact the inner cylinder, and then the cooling water in the cooling tank can cool the outer side of the high-temperature steam fluid; at the same time, through the cooperation of the infusion pipe, the main cooling pipe and the branch cooling pipe, the desuperheater can perform corresponding cooling treatment on the central part of the high-temperature steam fluid, and then the high-temperature steam fluid can be cooled synchronously inside and outside, thereby improving the cooling effect of the desuperheater on the high-temperature steam fluid and avoiding the waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view schematic diagram of an embodiment of the utility model.

[0014] Figure 2 It is a side view schematic diagram of an embodiment of the utility model.

[0015] Figure 3 It is a top view schematic diagram of an embodiment of the utility model.

[0016] Figure 4 It is a front view schematic diagram of the auxiliary fixing frame of the embodiment of the utility model.

[0017] In the figure: 1. outer tube; 2. partition plate; 3. inner tube; 4. main fixing frame; 5. main cooling pipe; 6. auxiliary block; 7. infusion pipe; 8. cooling trough; 9. liquid inlet; 10. confluence shell; 11. branch cooling pipe; 12. auxiliary fixing frame; 13. fixing block; 14. support plate; 15. positioning ring. DETAILED DESCRIPTION

[0018] Reference Figures 1 to 4 As shown, the utility model provides a desuperheater for a gas turbine generator, comprising: an outer tube 1 and a main cooling pipe 5, wherein the outer tube 1 is fixedly connected to the inner tube 3, and a liquid inlet 9 is provided on the upper surface of one end of the outer tube 1, and a liquid outlet is provided on the lower surface of the other end of the outer tube 1, and a partition plate 2 is fixedly connected to the cooling groove 8 formed between the outer tube 1 and the inner tube 3, and both ends of the inner side surface of the inner tube 3 are symmetrically connected to the main cooling pipe 5 through a main fixing frame 4, and one end of the main cooling pipe 5 close to the air inlet of the inner tube 3 is fixedly connected to an auxiliary block 6, the main cooling pipe 5 is fixedly connected to one end of a liquid infusion pipe 7, and the other end of the liquid infusion pipe 7 is connected to the outer surface of the outer tube 1, and one end of the main cooling pipe 5 away from the auxiliary block 6 is symmetrically connected to a branch cooling pipe 11, and the middle of the branch cooling pipe 11 is fixedly connected to a secondary fixing frame 12.

[0019] In this embodiment, when the high-temperature steam generated by the generator set of the gas turbine flows into the inner tube 3 through the air inlet of the desuperheater, the solenoid valve of the water inlet pipe is opened, so that the cooling water in the water inlet pipe can flow into the corresponding confluence shell 10, and then part of the cooling water flows into the cooling tank 8 through the liquid inlet 9, and the other part of the cooling water flows into the main cooling pipe 5 through the liquid delivery pipe 7, and the cooling water in the main cooling pipe 5 flows into another group of main cooling pipes 5 through the branch cooling pipe 11, and is discharged from the outer tube 1 again through the liquid delivery pipe 7. At this time, the cooling tank 8 discharges the coolant from the outer tube 1 through the liquid outlet, so the discharged cooling water can be recovered through the cooperation of the confluence shell 10 and the recovery pipe. The high-temperature steam fluid can be recycled and utilized to reduce the chance of wasting water resources. Then, when the high-temperature steam fluid flows inside the inner tube 3, the outer side of the high-temperature steam fluid will fit with the inner surface of the inner tube 3, and then the outer side of the high-temperature steam fluid will perform corresponding heat exchange with the cooling water in the cooling tank 8 to achieve cooling treatment of the outer side of the high-temperature steam fluid, and the central part of the high-temperature steam fluid will fully contact the surface of the main cooling pipe 5 and the branch cooling pipe 11, so that the central part of the high-temperature steam fluid will also perform sufficient heat exchange with the cooling water to achieve cooling treatment of the central part of the high-temperature steam fluid. Therefore, when the high-temperature steam fluid flows through the desuperheater, it can achieve a good cooling effect and improve the cooling efficiency.

[0020] As a preferred embodiment, the outer cylinder 1 and the inner cylinder 3 are both cylindrical structures, and the size of the openings at both ends of the outer cylinder 1 is smaller than the size of the internal cavity of the outer cylinder 1, and the axial section of the outer cylinder 1 is a [-shaped structure, and the outer diameters at both ends of the inner cylinder 3 are equal to the diameters of the openings at both ends of the outer cylinder 1.

[0021] In this embodiment, if Figure 1 The outer tube 1 is made of heat-insulating material, while the inner tube 3 is made of heat-conducting material, which can effectively enhance the cooling effect of the cooling water in the cooling tank 8 on the high-temperature steam fluid, and can also reduce the chance of accidental scalding when workers accidentally touch the desuperheater shell.

[0022] As a preferred embodiment, the partition plate 2 fixedly connected between the outer cylinder 1 and the inner cylinder 3 has a spiral structure, and a group of confluence shells 10 are fixedly connected to the outer surface of the outer cylinder 1 near the liquid inlet 9 and the liquid outlet, respectively. The cross-section of the confluence shell 10 has a U-shaped structure. At the same time, the confluence shell 10 near the liquid inlet 9 is connected to the water inlet pipe, and the confluence shell 10 near the liquid outlet is connected to the recovery pipe.

[0023] In this embodiment, if Figure 1 , Figure 2 and Figure 3 The setting of the partition plate 2 can not only limit the flow path of the cooling water in the cooling groove 8, but also enhance the stability of the connection between the outer tube 1 and the inner tube 3. At the same time, the setting of the confluence shell 10 facilitates the diversion and confluence of the cooling water.

[0024] As a preferred embodiment, there are two groups of total cooling pipes 5, both groups of total cooling pipes 5 are cylindrical structures, the axial cross-section of the total cooling pipes 5 is a U-shaped structure, and the auxiliary blocks 6 are hemispherical structures. At the same time, the total cooling pipes 5 and the infusion pipes 7 are combined together to form an L-shaped structure, and the infusion pipes 7 are connected to the interior of the corresponding conduit shell 10.

[0025] In this embodiment, if Figure 1 and Figure 3 The infusion pipe 7 and the main cooling pipe 5 are both made of heat-conducting materials, which can improve the cooling effect of the cooling water flowing in the infusion pipe 7 and the main cooling pipe 5 on the high-temperature steam fluid. At the same time, the setting of the auxiliary block 6 can reduce the impact interference of the high-temperature steam fluid on the main cooling pipe 5.

[0026] As a preferred embodiment, there are six groups of branch cooling pipes 11, and the six groups of branch cooling pipes 11 are all in a "J" shape structure, and the two ends of the branch cooling pipes 11 are respectively connected to the inner cavities of the two groups of main cooling pipes 5. At the same time, the main cooling pipes 5 and the branch cooling pipes 11 are combined together to form a "Z" shape structure.

[0027] In this embodiment, if Figure 1 and Figure 2 The branch cooling pipe 11 is made of heat-conducting material, and the setting of the branch cooling pipe 11 can effectively increase the total contact area between the central part of the high-temperature steam fluid and the cooling water, thereby helping to enhance the cooling effect of the central part of the high-temperature steam fluid.

[0028] As a preferred embodiment, there are two groups of main fixing frames 4, and each group of main fixing frames 4 is composed of a group of fixing rings and four groups of fixing plates. The fixing rings are in a circular ring structure, and the fixing plates are in a T-shaped structure. At the same time, the main fixing frames 4 are in a cross-shaped structure as a whole.

[0029] In this embodiment, if Figure 1 and Figure 2 The setting of the main fixing frame 4 can help enhance the stability of the main cooling pipe 5 set at the center of the inner tube 3, ensuring that the main cooling pipe 5 and the branch cooling pipe 11 can fully contact the central part of the high-temperature steam fluid.

[0030] As a preferred embodiment, the auxiliary fixed frame 12 is composed of a fixed block 13, a support plate 14 and a positioning ring 15, and the fixed block 13 is a circular ring structure, and the arc surface of the fixed block 13 surrounds six groups of support plates 14 fixedly connected at equal intervals, and the six groups of support plates 14 are all rectangular structures. At the same time, the ends of the six groups of support plates 14 away from the fixed block 13 are respectively fixedly connected to a group of positioning rings 15, and the positioning rings 15 are a circular ring structure.

[0031] In this embodiment, if Figure 1 , Figure 2 and Figure 4The provision of the auxiliary fixing frame 12 can help enhance the structural strength between the two groups of branch cooling pipes 11 , thereby helping reduce the interference effect of the airflow and reducing the probability of damage to the branch cooling pipes 11 .

[0032] The desuperheater for a gas turbine generator of the utility model cooperates with an outer tube 1, an inner tube 3, a partition plate 2, a main cooling pipe 5 and a branch cooling pipe 11, so that the desuperheater can perform comprehensive desuperheating treatment on the high-temperature steam circulating inside, thereby improving the desuperheating efficiency and the uniformity of the temperature change, and at the same time can also improve the utilization rate of water resources and reduce the problem of water resource waste.

Claims

1. A desuperheater for a gas turbine generator, comprising: Outer cylinder (1) and main cooling pipe (5), an inner cylinder (3) is fixedly connected inside the outer cylinder (1), and a liquid inlet (9) is provided on the upper surface at one end of the outer cylinder (1), and a liquid outlet is provided on the lower surface at the other end of the outer cylinder (1). It is characterized in that: a partition plate (2) is fixedly connected in the cooling tank (8) formed between the outer cylinder (1) and the inner cylinder (3), and both ends of the inner side surface of the inner cylinder (3) are symmetrically connected to the main cooling pipe (5) through main fixing frames (4), and an auxiliary block (6) is fixedly connected to one end of the main cooling pipe (5) close to the air inlet of the inner cylinder (3). One end of the main cooling pipe (5) is fixedly connected to one end of a liquid delivery pipe (7), the other end of the liquid delivery pipe (7) communicates with the outer surface of the outer cylinder (1), and branch cooling pipes (11) are symmetrically connected to the end of the main cooling pipe (5) far from the auxiliary block (6), and a secondary fixing frame (12) is fixedly connected to the middle of the branch cooling pipe (11).

2. A desuperheater for a gas turbine generator according to claim 1, characterized in that: Both the outer cylinder (1) and the inner cylinder (3) are in a cylindrical structure, and the dimensions of the openings at both ends of the outer cylinder (1) are smaller than the dimensions of the inner cavity of the outer cylinder (1), and the axial section of the outer cylinder (1) is in a [ shape structure, and at the same time, the outer diameters at both ends of the inner cylinder (3) are equal to the diameters of the openings at both ends of the outer cylinder (1).

3. A desuperheater for a gas turbine generator according to claim 1, characterized in that: The partition plate (2) fixedly connected between the outer cylinder (1) and the inner cylinder (3) is in a spiral structure, and a set of confluence shells (10) are respectively fixedly connected to the positions on the outer surface of the outer cylinder (1) close to the liquid inlet (9) and the liquid outlet. The cross section of the confluence shell (10) is in a 冂 shape structure, and at the same time, the confluence shell (10) close to the liquid inlet (9) communicates with the water inlet pipe, and the confluence shell (10) close to the liquid outlet communicates with the recovery pipe.

4. A desuperheater for a gas turbine generator according to claim 1, characterized in that: There are two groups of the main cooling pipes (5), both groups of the main cooling pipes (5) are in a cylindrical structure, and the axial section of the main cooling pipe (5) is in a 口 shape structure, and the auxiliary block (6) is in a hemispherical structure. At the same time, the main cooling pipe (5) and the liquid delivery pipe (7) are combined to form an L-shaped structure, and the liquid delivery pipe (7) communicates with the inside of the corresponding confluence shell (10).

5. A desuperheater for a gas turbine generator according to claim 1, characterized in that: There are six groups of the branch cooling pipes (11), all six groups of the branch cooling pipes (11) are in a 几 shape structure, and both ends of the branch cooling pipe (11) respectively communicate with the inner cavities of the two groups of main cooling pipes (5). At the same time, the main cooling pipe (5) and the branch cooling pipe (11) are combined to form a 中 shape structure.

6. A desuperheater for a gas turbine generator according to claim 1, characterized in that: There are two groups of the main fixing frames (4), and each group of the main fixing frames (4) is composed of a set of fixing rings and four sets of fixing plates. The fixing ring is in a circular ring structure, and the fixing plate is in a T shape structure. At the same time, the main fixing frame (4) as a whole is in a cross shape structure.

7. A desuperheater for a gas turbine generator according to claim 1, characterized in that: The secondary fixing frame (12) is composed of a fixing block (13), a support plate (14) and a positioning ring (15). The fixing block (13) is in a circular ring structure, and six sets of support plates (14) are fixedly connected to the arc surface of the fixing block (13) at equal intervals around. All six sets of support plates (14) are in a rectangular structure. At the same time, one end of the six sets of support plates (14) far from the fixing block (13) are respectively fixedly connected to a set of positioning rings (15), and the positioning ring (15) is in a circular ring structure.

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