Exhaust cooling system of compressed gas energy storage turbine
By introducing an exhaust cooling system into the compressed gas energy storage turbine and using high-pressure, low-temperature working fluid to cool the low-pressure cylinder, the problem of excessively high exhaust temperature in the low-pressure cylinder is solved, achieving a balance between safety and economy.
Patent Information
- Application Number
- CN202422265805.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The exhaust temperature of the low-pressure cylinder of the compressed gas energy storage turbine is too high, causing the unit to shut down abnormally and affecting safety.
An exhaust cooling system is used to transport the high-pressure, low-temperature working fluid in the high-pressure gas storage tank to the cooling port of the low-pressure cylinder through the medium delivery branch and the exhaust cooling branch for mixed cooling. The temperature is monitored by a temperature measuring element and the opening of the cooling valve is controlled to achieve temperature control of the low-pressure cylinder exhaust.
It effectively reduces the exhaust temperature of the low-pressure cylinder, avoids abnormal shutdown of the unit, ensures the safety of the unit, and does not affect the economy of the system.
Smart Images
Figure CN223330620U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of compressed air energy storage, and in particular relates to an exhaust cooling system of a compressed gas energy storage turbine. Background Art
[0002] With the advancement of compressed gas energy storage technology, energy storage power stations are moving towards longer-duration, higher-power development. Some projects currently in operation or under construction have already reached 300MW in capacity. During turbine design, the exhaust temperature of the low-pressure cylinder of the turbine is typically around 20-60°C. However, based on the testing requirements of conventional thermal power plants, compressed gas energy storage turbine generator sets must undergo no-load testing, electrical testing, and valve tightness testing, requiring several hours of testing at no-load.
[0003] During no-load or low-load operation, the turbine's high-pressure cylinder inlet pressure and flow are very low, while the low-pressure cylinder inlet and outlet pressures are minimal or nonexistent. This results in a severe blast effect in the low-pressure cylinder. Unlike conventional thermal power steam turbines, compressed gas energy storage turbines lack water spray cooling at the low-pressure cylinder exhaust. Exhaust temperatures can reach as high as 150-200°C, exceeding the low-pressure cylinder exhaust temperature limit, causing unplanned unit shutdowns and compromising unit safety.
[0004] Therefore, a compressed gas energy storage turbine exhaust cooling system is needed to prevent the low-pressure cylinder exhaust temperature from being too high. Utility Model Content
[0005] In response to the above problems, the present invention provides an exhaust cooling system for a compressed gas energy storage turbine, which adopts the following technical solutions:
[0006] An exhaust cooling system for a compressed gas energy storage turbine comprises a high-pressure gas storage tank, a medium delivery branch and an exhaust cooling branch;
[0007] Among them, one end of the medium delivery branch is connected to the high-pressure gas storage tank, and the other end of the medium delivery branch is connected to the air inlet of the compressed gas energy storage turbine. One end of the exhaust cooling branch is connected to the high-pressure gas storage tank, and the other end of the exhaust cooling branch is connected to the exhaust end cooling port of the compressed gas energy storage turbine.
[0008] Furthermore, the compressed gas energy storage turbine includes a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder connected in series;
[0009] Among them, a first heater is arranged between the other end of the medium delivery branch and the air inlet of the high-pressure cylinder, a second heater is arranged between the air outlet of the high-pressure cylinder and the air inlet of the medium-pressure cylinder, and a third heater is arranged between the air outlet of the medium-pressure cylinder and the air inlet of the low-pressure cylinder. The other end of the exhaust cooling branch is connected to the cooling port of the low-pressure cylinder.
[0010] Furthermore, the exhaust cooling system further comprises a low-pressure exhaust pipe and a temperature measuring element;
[0011] One end of the low-pressure exhaust pipeline is connected to the exhaust port of the low-pressure cylinder, and the temperature measuring element is arranged on the low-pressure exhaust pipeline.
[0012] Furthermore, the cooling port of the low-pressure cylinder is a cooling port in front of the last blade of the low-pressure cylinder.
[0013] Furthermore, the cooling port of the low-pressure cylinder is arranged on the low-pressure exhaust pipeline or at the front end of the air inlet of the low-pressure cylinder.
[0014] Furthermore, an outlet valve is provided on the medium delivery branch.
[0015] Furthermore, a high-pressure main gas valve and a high-pressure regulating valve are provided in series between the working medium side outlet of the first heater and the air inlet of the high-pressure cylinder.
[0016] Furthermore, a medium-pressure main air valve and a medium-pressure regulating valve are provided in series between the working medium side outlet of the second heater and the air inlet of the medium-pressure cylinder.
[0017] Furthermore, a low-pressure regulating valve is provided between the working medium side outlet of the third heater and the air inlet of the low-pressure cylinder.
[0018] Furthermore, a cooling control valve is provided on the exhaust cooling branch.
[0019] The beneficial effects of this utility model include utilizing the exhaust cooling branch to transport high-pressure, low-temperature working fluid from the high-pressure gas storage tank to the exhaust cooling port of the compressed gas energy storage turbine for mixing, resulting in effective cooling while simultaneously preventing the introduction of new working fluid into the compressed gas energy storage turbine. When the compressed gas energy storage turbine is operating normally or when the exhaust temperature falls below the control value, the cooling control valve remains closed, thus minimizing system economics.
[0020] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 A schematic structural diagram of an exhaust gas cooling system for a compressed gas energy storage turbine according to an embodiment of the present utility model is shown.
[0023] In the figure: 1. Generator; 2. High-pressure gas storage tank; 3. Medium conveying branch; 4. Exhaust cooling branch; 5. Low-pressure exhaust pipeline; 6. Temperature measuring element; 7. High-pressure cylinder; 8. Medium-pressure cylinder; 9. Low-pressure cylinder; 10. First heater; 11. Second heater; 12. Third heater; 13. Outlet valve; 14. High-pressure main air valve; 15. High-pressure regulating valve; 16. Medium-pressure main air valve; 17. Medium-pressure regulating valve; 18. Low-pressure regulating valve; 19. Cooling control valve. DETAILED DESCRIPTION
[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0025] It should be noted that the terms "first," "second," etc., in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so as to facilitate the embodiments of the present application described herein.
[0026] The utility model provides a compressed gas energy storage turbine exhaust cooling system, which reduces the low-pressure exhaust temperature at no load or low load by introducing low-temperature compressed gas for mixed cooling, avoids excessively high low-pressure cylinder exhaust temperature, and ensures the safety of the unit.
[0027] An exhaust cooling system for a compressed gas energy storage turbine, wherein a rotating shaft of the compressed gas energy storage turbine is drivingly connected to a generator 1, and the compressed gas energy storage turbine is used to drive the generator 1 to generate electricity.
[0028] like Figure 1 As shown, the exhaust cooling system includes a high-pressure gas storage tank 2, a medium delivery branch 3, an exhaust cooling branch 4, a low-pressure exhaust pipeline 5 and a temperature measuring element 6.
[0029] Among them, one end of the medium delivery branch 3 is connected to the high-pressure gas storage tank 2, and the other end of the medium delivery branch 3 is connected to the air inlet of the compressed gas energy storage turbine. One end of the exhaust cooling branch 4 is connected to the high-pressure gas storage tank 2, and the other end of the exhaust cooling branch 4 is connected to the exhaust end cooling port of the compressed gas energy storage turbine.
[0030] For example, the compressed gas energy storage turbine includes a high-pressure cylinder 7, a medium-pressure cylinder 8 and a low-pressure cylinder 9 connected in series in sequence. A first heater 10 is arranged between the other end of the medium conveying branch 3 and the air inlet of the high-pressure cylinder 7, a second heater 11 is arranged between the air outlet of the high-pressure cylinder 7 and the air inlet of the medium-pressure cylinder 8, and a third heater 12 is arranged between the air outlet of the medium-pressure cylinder 8 and the air inlet of the low-pressure cylinder 9.
[0031] One end of the medium conveying branch 3 is connected to the high-pressure gas storage tank 2, and the other end of the medium conveying branch 3 is connected to the working fluid side inlet of the first heater 10, the working fluid side outlet of the first heater 10 is connected to the air inlet of the high-pressure cylinder 7, the air outlet of the high-pressure cylinder 7 is connected to the working fluid side inlet of the second heater 11, the working fluid side outlet of the second heater 11 is connected to the air inlet of the medium-pressure cylinder 8, the air outlet of the medium-pressure cylinder 8 is connected to the working fluid side inlet of the third heater 12, and the working fluid side outlet of the third heater 12 is connected to the air inlet of the low-pressure cylinder 9.
[0032] Heat exchange medium flows into the heat exchange sides of the first heater 10 , the second heater 11 and the third heater 12 to heat the gas on the working medium side.
[0033] The number of turbine stages, number of heating stages, compressed gas medium, source of cooling medium, and specific cooling medium inlet location in this utility model are not limited to the above-described application examples and can be adjusted according to specific circumstances. For example, the number of turbine stages can be changed to two or four, the number of heating stages can be changed to two or four, the compressed gas medium can be air, carbon dioxide, hydrogen, etc., and the cooling medium can come from a compressor or other process system. These adjusted solutions are all within the scope of the utility model.
[0034] One end of the exhaust cooling branch 4 is connected to the high-pressure gas storage tank 2, and the other end of the exhaust cooling branch 4 is connected to the cooling port of the low-pressure cylinder 9. The exhaust cooling branch 4 is used to transport the high-pressure and low-temperature gas working medium in the high-pressure gas storage tank 2 to the cooling port of the low-pressure cylinder 9 to mix with the exhaust of the low-pressure cylinder 9 to cool the exhaust temperature.
[0035] One end of the low-pressure exhaust pipeline 5 is communicated with the exhaust port of the low-pressure cylinder 9 , and the temperature measuring element 6 is arranged on the low-pressure exhaust pipeline 5 .
[0036] For example, the cooling port of the low-pressure cylinder 9 may be a cooling port before the last blade of the low-pressure cylinder 9 , or may be provided on the low-pressure exhaust pipe 5 or at the air inlet of the low-pressure cylinder 9 .
[0037] For example, an outlet valve 13 is provided on the medium delivery branch 3 . When the outlet valve 13 is opened, the high-pressure gas medium in the high-pressure gas storage tank 2 is delivered to the working medium side of the first heater 10 through the medium delivery branch 3 .
[0038] For example, a high-pressure main air valve 14 and a high-pressure regulating valve 15 are arranged in series between the working fluid side outlet of the first heater 10 and the air inlet of the high-pressure cylinder 7, a medium-pressure main air valve 16 and a medium-pressure regulating valve 17 are arranged in series between the working fluid side outlet of the second heater 11 and the air inlet of the medium-pressure cylinder 8, and a low-pressure regulating valve 18 is arranged between the working fluid side outlet of the third heater 12 and the air inlet of the low-pressure cylinder 9.
[0039] When the compressed gas energy storage and release power generation side is running, the high-pressure main gas valve 14, the medium-pressure main gas valve 16, the medium-pressure regulating valve 17, and the low-pressure regulating valve 18 are fully opened, and the unit load is controlled by adjusting the opening of the high-pressure regulating valve 15.
[0040] For example, a cooling control valve 19 is provided on the exhaust cooling branch 4. When the cooling control valve 19 is opened, the exhaust cooling branch 4 transports the high-pressure and low-temperature gas working medium in the high-pressure gas storage tank 2 to the cooling port of the low-pressure cylinder 9, and controls the exhaust temperature of the turbine by controlling the opening of the cooling control valve 19.
[0041] When the exhaust temperature of the low-pressure cylinder 9 is high, the cooling pipeline valve can be opened or the heat exchange side of the third heater 12 at the air inlet of the low-pressure cylinder 9 can be replaced by a cold medium instead of a hot medium.
[0042] The operating principle of this utility model is as follows: When the compressed gas energy storage turbine is operating on the energy-discharging and power-generating side, outlet valve 13 is opened, and the high-pressure gas medium in the high-pressure gas storage tank 2 is introduced into the first heater 10, second heater 11, and third heater 12 for heating. The heated gas then enters the turbine's high-pressure cylinder 7, intermediate-pressure cylinder 8, and low-pressure cylinder 9 to perform work. By fully opening the high-pressure main air valve 14, intermediate-pressure main air valve 16, intermediate-pressure regulating valve 17, and low-pressure regulating valve 18, the compressed gas energy storage turbine load is controlled by adjusting the high-pressure regulating valve 15 degrees.
[0043] When the compressed gas energy storage turbine is operating at no load or low load, the temperature of the low-pressure exhaust line 5 is monitored by temperature measuring element 6. When the exhaust temperature exceeds a set value (e.g., 100°C), the cooling control valve 19 is gradually opened, and the exhaust cooling branch 4 transports the high-pressure, low-temperature gas from the high-pressure gas storage tank 2 to the cooling port of the low-pressure cylinder 9 to cool the low-pressure cylinder 9. The temperature of the low-pressure exhaust line 5 is controlled (e.g., 80°C) by adjusting the opening of the cooling control valve 19 or controlling the intake temperature of the low-pressure cylinder 9. The intake temperature of the low-pressure cylinder 9 is controlled by controlling the temperature of the heat exchange side of the third heater 12. When the compressed gas energy storage turbine is operating at high load or full load, the temperature of the low-pressure exhaust line 5 decreases as the load increases, and the cooling control valve 19 is closed.
[0044] This utility model utilizes the high-pressure, low-temperature working fluid in the high-pressure gas storage tank 2 to mix with the turbine exhaust through throttling, resulting in a superior cooling effect. Furthermore, the compressed gas energy storage turbine does not introduce new working fluid. When the compressed gas energy storage turbine is operating normally or the exhaust temperature is below the control value, the cooling control valve 19 does not open, thus not affecting the system's economic efficiency.
[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. An exhaust cooling system for a compressed gas energy storage turbine, characterized in that: It includes high-pressure gas storage tank, medium delivery branch and exhaust cooling branch; Among them, one end of the medium delivery branch is connected to the high-pressure gas storage tank, and the other end of the medium delivery branch is connected to the air inlet of the compressed gas energy storage turbine. One end of the exhaust cooling branch is connected to the high-pressure gas storage tank, and the other end of the exhaust cooling branch is connected to the exhaust end cooling port of the compressed gas energy storage turbine.
2. The exhaust gas cooling system of the compressed gas energy storage turbine according to claim 1, characterized in that: The compressed gas energy storage turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder connected in series; Among them, a first heater is arranged between the other end of the medium delivery branch and the air inlet of the high-pressure cylinder, a second heater is arranged between the air outlet of the high-pressure cylinder and the air inlet of the medium-pressure cylinder, and a third heater is arranged between the air outlet of the medium-pressure cylinder and the air inlet of the low-pressure cylinder. The other end of the exhaust cooling branch is connected to the cooling port of the low-pressure cylinder.
3. The exhaust gas cooling system of the compressed gas energy storage turbine according to claim 2, characterized in that: The exhaust cooling system also includes a low-pressure exhaust line and a temperature measuring element; One end of the low-pressure exhaust pipeline is connected to the exhaust port of the low-pressure cylinder, and the temperature measuring element is arranged on the low-pressure exhaust pipeline.
4. The exhaust gas cooling system of the compressed gas energy storage turbine according to claim 2, characterized in that: The cooling port of the low-pressure cylinder is a cooling port in front of the last blade of the low-pressure cylinder.
5. The exhaust gas cooling system of the compressed gas energy storage turbine according to claim 3, characterized in that: The cooling port of the low-pressure cylinder is arranged on the low-pressure exhaust pipeline or at the front end of the air inlet of the low-pressure cylinder.
6. The exhaust gas cooling system of a compressed gas energy storage turbine according to any one of claims 1 to 5, characterized in that: An outlet valve is provided on the medium delivery branch.
7. The exhaust gas cooling system of a compressed gas energy storage turbine according to any one of claims 2 to 5, characterized in that: A high-pressure main gas valve and a high-pressure regulating valve are provided in series between the working medium side outlet of the first heater and the air inlet of the high-pressure cylinder.
8. The exhaust gas cooling system of a compressed gas energy storage turbine according to any one of claims 2 to 5, characterized in that: A medium-pressure main air valve and a medium-pressure regulating valve are provided in series between the working medium side outlet of the second heater and the air inlet of the medium-pressure cylinder.
9. The exhaust gas cooling system of a compressed gas energy storage turbine according to any one of claims 2 to 5, characterized in that: A low-pressure regulating valve is provided between the working medium side outlet of the third heater and the air inlet of the low-pressure cylinder.
10. The exhaust gas cooling system of a compressed gas energy storage turbine according to any one of claims 1 to 5, characterized in that: A cooling control valve is provided on the exhaust cooling branch.