Waterproof plug water jet steam extraction vacuum system
By setting a water extraction pipe at the lowest point of the pipeline of the water injection steam extraction vacuum system and controlling the opening and closing of the water pumping door, the problem of water plug formation is solved and the normal operation of the vacuum system and the safety of the steam turbine are ensured.
Patent Information
- Application Number
- CN202421176248.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-27
AI Technical Summary
In the water-shot and steam-sucking vacuum system, water is easily accumulated due to the bending and local low points of the pipeline structure, resulting in the formation of water plugs and affecting the normal operation of the vacuum system.
Set up a pipe pumping pipe at the lowest point of the first pipe and the second pipe, and control the opening and closing of the pumping door to ensure that the condensed water is pumped away by the negative pressure of the condenser to avoid the formation of water plugs.
It effectively avoids the formation of water plugs in the pipeline, ensures the normal operation of the vacuum system, and improves the safety of the steam turbine.
Smart Images
Figure CN222378834U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of thermal power generation, and particularly relates to a water-proof plug jetting steam extraction vacuum system. Background Art
[0002] The vacuum system is one of the important components of coal-fired power plants in the thermal power generation industry. Generally, the vacuum system of the steam turbine is composed of condensers, extraction equipment, circulating water pumps, condensate pumps and other equipment as well as a series of pipeline valves. The principle and function of the vacuum system are as follows: there are a large number of heat exchange tube bundles in the condenser, and the circulating water pump transports the circulating water with a lower temperature to the condenser tube bundle. The steam exhaust with a higher temperature in the low-pressure cylinder of the steam turbine enters the condensation zone of the condenser. The steam condenses into water when it is cooled, thus forming a high vacuum in the condenser, reducing the exhaust pressure of the steam turbine and increasing the ideal enthalpy drop of the steam in the steam turbine. In this process, most of the steam exhaust becomes condensate and is pumped away by the condensate pump, and the working fluid is also recovered, while the very little uncondensed steam and some non-condensable gases are pumped out by the extraction equipment to avoid accumulation in the condensation zone of the condenser and causing the vacuum to drop. It can be seen that the main task of the vacuum system in the coal-fired power generation process is to establish and maintain a vacuum.
[0003] The steam turbine vacuum system can be divided into a water jet extraction vacuum system and a water ring vacuum system according to the different principles of the steam extraction equipment in the condenser condensation zone. The core equipment of the water jet extraction vacuum system is the water jet extractor. The principle is that water flows into the water inlet pipe of the water jet extractor after being pressurized by the water jet pump, and is ejected at a high speed from the working nozzle to form a jet at the throat, so that air is sucked into the room to generate a high vacuum, thereby extracting the steam and gas mixture in the condenser.
[0004] However, there are a large number of pipes in the water-jet steam extraction vacuum system. Due to the process requirements, the water-jet steam extraction unit should be arranged at a higher height than the condenser. Because the condenser is just above the low-pressure cylinder of the turbine, and there are a large number of equipment blocking the site, the connecting pipe from the water-jet steam extraction unit to the condenser cannot be directly arranged from top to bottom. Therefore, there are many elbows on the connecting pipe, and a structure similar to a U-shaped pipe or an L-shaped pipe is inevitably formed in the local position. Therefore, there are the following problems: water is easily accumulated in the U-shaped pipe or the L-shaped pipe, especially in the pipe section from the water-jet steam extraction main pipe to the condenser. Since the steam from the condenser is easily condensed in this pipe section, water is easily accumulated in this pipe section. The direct impact is that when the amount of accumulated water reaches a certain level, a water plug will form in the pipeline, resulting in the inability to extract air from the condenser, causing the vacuum to drop, seriously affecting the safe operation of the turbine. Utility Model Content
[0005] The utility model provides a water-proof plug water-jetting steam-evacuation vacuum system, aiming to solve at least one problem existing in the above-mentioned prior art.
[0006] The utility model is implemented as follows: a waterproof plug water jet steam extraction vacuum system, comprising:
[0007] A water jetting tank, the water jetting tank is connected to a water jetting pump and is used to pressurize the liquid in the water jetting tank and then transport it to the water jetting steam extractor;
[0008] The water jet steam extractor is connected to the water jet air extraction electric door through a first pipeline, a first pipeline water extraction pipe is installed at the lowest point of the first pipeline, and a first water extraction door is arranged on the first pipeline water extraction pipe;
[0009] The water jetting and air pumping electric door is connected to the condenser through a second pipeline, a second pipeline water pumping pipe is installed at the lowest point of the second pipeline, and a second water pumping door is arranged on the second pipeline water pumping pipe;
[0010] The first pipeline water pumping pipe and the second pipeline water pumping pipe are respectively connected to a pipeline water pumping mother pipe, and the pipeline water pumping mother pipe is connected to the condensing area of the condenser.
[0011] In one embodiment, the water jetting pump includes a first water jetting pump and a second water jetting pump, and the water jetting steam extractor includes a first water jetting steam extractor and a second water jetting steam extractor. The first water jetting pump is respectively connected to the water jetting box and the first water jetting steam extractor, and the second water jetting pump is respectively connected to the water jetting box and the second water jetting steam extractor.
[0012] In one embodiment, the first water pumping gates include two, the water-jetting and air-evacuating electric gates include a first water-jetting and air-evacuating electric gate and a second water-jetting and air-evacuating electric gate, and the first water pumping gates are respectively arranged between the first water-jetting and steam extractor and the first water-jetting and steam extractor and the second water-jetting and air-evacuating electric gate.
[0013] In one embodiment, the water jetting steam extractor is connected to the water jetting tank and is used to transport the liquid delivered by the water jetting pump into the water jetting tank.
[0014] In one embodiment, the condensate in the first pipeline is transported to the first pipeline pumping pipe through the first pumping gate, and the condensate in the second pipeline is transported to the second pipeline pumping pipe through the second pumping gate.
[0015] In one embodiment, a sewage discharge door is provided on the second pipeline.
[0016] In one embodiment, a vacuum breaking door is provided on the second pipe.
[0017] In one embodiment, the condenser is connected to the circulating water pump and the condensate pump respectively.
[0018] In one embodiment, a water injection replenishment pipe is connected to the water injection tank, which is used to replace water and cool the water injection tank when the temperature of the water injection tank is greater than a preset threshold.
[0019] In one embodiment, an overflow pipe is connected to the water shooting tank, and the other end of the overflow pipe is connected to a water storage tank, so that when the water shooting replenishment pipe transports liquid to the water shooting tank, excess liquid in the water shooting tank flows into the water storage tank through the overflow pipe.
[0020] The utility model provides a water-proof plug water-jetting steam extraction vacuum system, comprising: a water-jetting box, which is connected to a water-jetting pump and is used to pressurize the liquid in the water-jetting box and then transport it to the water-jetting steam extractor; the water-jetting steam extractor is connected to a water-jetting air extraction electric door through a first pipeline, a first pipeline water extraction pipe is installed at the lowest point of the first pipeline, and a first water extraction gate is arranged on the first pipeline water extraction pipe; the water-jetting air extraction electric door is connected to a condenser through a second pipeline, a second pipeline water extraction pipe is installed at the lowest point of the second pipeline, and a second water extraction gate is arranged on the second pipeline water extraction pipe; the first pipeline water extraction pipe and the second pipeline water extraction pipe are respectively connected to a pipeline water extraction mother pipe, and the pipeline water extraction mother pipe is connected to the condensation area of the condenser. In the embodiment of the present application, by setting a pipeline pumping pipe at the lowest point of the first pipeline and the second pipeline, when the system is operating normally, the first pumping valve of the pipeline between the water ejector steam extractor and the water ejector air extraction electric door is closed, and the second pumping valve of the pipeline between the water ejector air extraction electric door and the condenser air extraction isolation door is opened, so that the condensed water in the pipeline can be pumped away by the negative pressure of the condenser, thereby avoiding the formation of water plugs in the pipeline; if the system has formed a water plug, the first pumping valve of the pipeline between the water ejector steam extractor and the water ejector air extraction electric door, and the second pumping valve of the pipeline between the water ejector air extraction electric door and the condenser are opened at the same time, so that the pipeline can be formed into a connected state, so that all condensed water is pumped away by the condenser, thereby improving the operating safety of the turbine. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the structure of a water-proof plug water-jetting steam-evacuation vacuum system provided in an embodiment of the present application. Figure 1 ;
[0022] Figure 2 This is a schematic diagram of the structure of a water-proof plug water-jetting steam-evacuation vacuum system provided in an embodiment of the present application. Figure 2 ;
[0023] Among them, 1. water jetting tank; 2. water jetting pump; 3. water jetting steam extractor; 4. first pipeline; 5. water jetting air extraction electric door; 6. first water extraction door; 7. second pipeline; 8. condenser; 9. second pipeline water extraction pipe; 10. second water extraction door; 11. pipeline water extraction mother pipe; 12. first air extraction isolation door; 13. second air extraction isolation door; 14. third pipeline; 15. sewage door; 16. vacuum destruction door; 17. circulating water pump; 18. condenser hot well; 19. condensate pump; 20. water jetting water supply pipe; 21. overflow pipe; 22. water storage tank; 23. first pipeline water extraction pipe; 2-1. first water jetting pump; 2-2. second water jetting pump; 3-1. first water jetting steam extractor; 3-2. second water jetting steam extractor; 6-1. first water jetting air extraction electric door; 6-2. second water jetting air extraction electric door. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0025] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] In an embodiment of the present application, a waterproof plug water-jetting steam extraction vacuum system is provided, including: a water-jetting box 1, wherein the water-jetting box 1 is connected to a water-jetting pump 2, and is used to pressurize the liquid in the water-jetting box 1 and then transport it to the water-jetting steam extractor 3; the water-jetting steam extractor 3 is connected to a water-jetting air extraction electric door 5 through a first pipeline 4, and a first pipeline water extraction pipe 23 is installed at the lowest point of the first pipeline 4, and a first water extraction gate 6 is arranged on the first pipeline water extraction pipe 5; the water-jetting air extraction electric door 5 is connected to a condenser 8 through a second pipeline 7, and a second pipeline water extraction pipe 9 is installed at the lowest point of the second pipeline 7, and a second water extraction gate 10 is arranged on the second pipeline water extraction pipe 9; the first pipeline water extraction pipe 23 and the second pipeline water extraction pipe 9 are respectively connected to a pipeline water extraction mother pipe 11, and the pipeline water extraction mother pipe 11 is connected to the condensation zone of the condenser 8. By setting pipeline pumping pipes at the lowest points of the first pipeline and the second pipeline, when the system is operating normally, closing the first pumping valve of the pipeline between the water ejector steam extractor and the water ejector air extraction electric door, and opening the second pumping valve of the pipeline between the water ejector air extraction electric door and the condenser air extraction isolation door, the condensed water in the pipeline can be pumped away by the negative pressure of the condenser, thereby avoiding the formation of water plugs in the pipeline; if water plugs have already formed in the system, opening the first pumping valve of the pipeline between the water ejector steam extractor and the water ejector air extraction electric door, and the second pumping valve of the pipeline between the water ejector air extraction electric door and the condenser at the same time can make the pipeline form a connected state, so that all condensed water is pumped away by the condenser, thereby improving the operating safety of the turbine.
[0028] The lowest point of the pipeline refers to the position in the first pipeline or the second pipeline that is closest to the ground. For example, when the first pipeline 4 or the second pipeline 7 is an L-shaped pipeline, the lowest point may include multiple ones, and any one of them can be selected as the lowest point.
[0029] The first pumping door 6 and the second pumping door 10 may be isolation doors, such as valves, for isolating the first pipeline 4 from the first pipeline pumping pipe 23 and isolating the second pipeline 9 from the second pipeline pumping pipe 9 .
[0030] In the embodiment of the present application, the second water pumping door 10 is connected to the condenser 8 via a third pipe 14 , and the third pipe 16 is provided with a first air pumping isolation door 12 and a second air pumping isolation door 13 .
[0031] In the embodiment of the present application, the water jetting steam extractor 3 is connected to the water jetting tank 1, and is used to transport the liquid transported by the water jetting pump 2 to the water jetting tank 1. For example, when the water jetting pump 2 is running, the liquid in the water jetting tank 1 flows into the water jetting pump 2 by gravity, and is transported to the water jetting steam extractor 3 after being pressurized by the water jetting pump 2. The high-speed water flow is ejected at the throat of the water jetting steam extractor 3 and returns to the water jetting tank 1, forming a cycle.
[0032] In the embodiment of the present application, the condensed water in the first pipeline 4 is transported to the first pipeline pumping pipe 5 through the first pumping gate 6, and the condensed water in the second pipeline 7 is transported to the second pipeline pumping pipe 9 through the second pumping gate 10. The pipeline between the ejector steam extractor 3 and the ejector air pumping electric gate 5, and the pipeline between the ejector air pumping electric gate 5 and the condenser 8, because the local low point of the above pipeline, especially the part where the U-shaped tube is formed, is prone to water accumulation, when the amount of accumulated water reaches a certain level, a water plug will be formed in the pipeline, resulting in the inability to extract air from the condenser, causing the vacuum to drop, seriously affecting the safe operation of the turbine, so by arranging the pipeline pumping pipe at the lowest point, and the pipeline pumping pipe can be connected to the condenser, the condensed water in the pipeline can be discharged to avoid the formation of water plugs.
[0033] In the embodiment of the present application, a sewage discharge door 15 is provided on the second pipe 7. The sewage discharge door 15 is arranged between the water jetting and air pumping electric door 5 and the second water pumping door 10, and is used to discharge the sewage in the pipe to avoid blockage of the pipe.
[0034] In the embodiment of the present application, the second pipeline is also provided with a vacuum breaking door 16. The vacuum breaking door 16 is used to break the vacuum environment of the water jet steam extraction vacuum system, and can be used for emergency shutdown and rapid shutdown when over critical speed and to prevent damage caused by unit resonance.
[0035] In an embodiment of the present application, the condenser 8 can be connected to the inlet and outlet of the circulating water pump 17 respectively, and a condenser hot well 18 is arranged under the condenser 8, and the condenser 10 can also be connected to the condensate pump 19 to pump the condensate under the action of the condensate pump 19.
[0036] In the embodiment of the present application, the water jetting pump 2 includes a first water jetting pump 2-1 and a second water jetting pump 2-2, and the water jetting steam extractor 3 includes a first water jetting steam extractor 3-1 and a second water jetting steam extractor 3-2. The first water jetting pump 2-1 is respectively connected to the water jetting box 1 and the first water jetting steam extractor 31, and the second water jetting pump 2-1 is respectively connected to the water jetting box 1 and the second water jetting steam extractor 3-2.
[0037] Similarly, the first water pumping gate 6 includes two, namely, a first water pumping gate A and a second water pumping gate B, and the water-jetting air pumping electric gate 5 includes a first water-jetting air pumping electric gate 6-1 and a second water-jetting air pumping electric gate 6-2. The first water pumping gate A is arranged between the first water-jetting steam pump 3-1 and the first water-jetting air pumping electric gate 6-1, and the first water pumping gate B is arranged between the second water-jetting steam pump 3-2 and the second water-jetting air pumping electric gate 6-2.
[0038] When the first water ejector pump 2-1 is running, the first water ejector air pumping electric door 6-1 is opened, the second water ejector air pumping electric door 6-2 is closed, the first water pumping door A is closed, the first water pumping door B is closed, the second water pumping door 10 is opened, the first air pumping isolation door 12 and the second air pumping isolation door 13 are both kept open, and the sewage gate is closed. At this time, the uncondensed gas in the condenser 8 is pumped away under the suction action of the water ejector 3; when the second water ejector pump 2-2 is running, the second water ejector air pumping electric door 6-2 is opened, the first water ejector air pumping electric door 6-1 is closed, the first water pumping door A is closed, the first water pumping door B is closed, the second water pumping door 10 is opened, the first air pumping isolation door 12 and the second air pumping isolation door 13 are both kept open, and the sewage gate is closed. Similarly, the uncondensed gas in the condenser 8 is pumped away under the suction action of the water ejector.
[0039] If a large amount of condensate accumulates in the pipeline between the water jet steam extractor 3 and the condenser 8, the first pumping gate A, the first pumping gate B and the second pumping gate 10 can be opened at the same time, and the condensate will be pumped away by the negative pressure of the condenser. Then the first pumping gate A and the first pumping gate B can be closed to restore the system to normal operation.
[0040] In the embodiment of the present application, the water jetting tank 1 is connected with a water jetting water supply pipe 20, which is used to replace water and cool down the water jetting tank 1 when the temperature of the water jetting tank 1 is greater than a preset threshold. The water jetting water supply pipe 20 can be used to connect a water supply end, such as a water supply structure formed by a water pump and a water tank, to transport the liquid provided by the water supply end to the water jetting tank to cool down the water jetting tank.
[0041] Furthermore, the water jetting tank 1 is connected with an overflow pipe 21, and the other end of the overflow pipe 21 is connected with a water storage tank 22, so that when the water jetting water supply pipe 20 delivers liquid to the water jetting tank 1, the excess liquid in the water jetting tank 1 flows into the water storage tank 22 through the overflow pipe 21. Thus, the liquid in the water jetting tank can be kept at a stable water level, and water supply and cooling can be achieved.
[0042] In the embodiment of the present application, a temperature sensor may be provided on the water shooting box 1 for detecting the temperature value of the water shooting box. A liquid level meter may also be provided on the water shooting box 1 for replenishing water into the water shooting box 1 through the water shooting replenishing pipe 20 in time when the liquid level in the water shooting box 1 is lower than a preset water level.
[0043] In the embodiment of the present application, by setting a pipeline pumping pipe at the lowest point of the first pipeline and the second pipeline, when the system is operating normally, the first pumping valve of the pipeline between the water ejector steam extractor and the water ejector air extraction electric door is closed, and the second pumping valve of the pipeline between the water ejector air extraction electric door and the condenser air extraction isolation door is opened, so that the condensed water in the pipeline can be pumped away by the negative pressure of the condenser, thereby avoiding the formation of water plugs in the pipeline; if the system has formed a water plug, the first pumping valve of the pipeline between the water ejector steam extractor and the water ejector air extraction electric door, and the second pumping valve of the pipeline between the water ejector air extraction electric door and the condenser are opened at the same time, so that the pipeline can be formed into a connected state, so that all condensed water is pumped away by the condenser, thereby improving the operating safety of the turbine.
[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A water-proof plug water jetting steam vacuum system, characterized in that: The system comprises: A water jetting tank, the water jetting tank is connected to a water jetting pump and is used to pressurize the liquid in the water jetting tank and then transport it to the water jetting steam extractor; The water jet steam extractor is connected to the water jet air extraction electric door through a first pipeline, a first pipeline water extraction pipe is installed at the lowest point of the first pipeline, and a first water extraction door is arranged on the first pipeline water extraction pipe; The water jetting and air pumping electric door is connected to the condenser through a second pipeline, a second pipeline water pumping pipe is installed at the lowest point of the second pipeline, and a second water pumping door is arranged on the second pipeline water pumping pipe; The first pipeline water pumping pipe and the second pipeline water pumping pipe are respectively connected to a pipeline water pumping mother pipe, and the pipeline water pumping mother pipe is connected to the condensing area of the condenser.
2. The water-proof plug water jetting steam vacuum system according to claim 1, characterized in that: The water jetting pump includes a first water jetting pump and a second water jetting pump, and the water jetting steam extractor includes a first water jetting steam extractor and a second water jetting steam extractor. The first water jetting pump is connected to the water jetting box and the first water jetting steam extractor respectively, and the second water jetting pump is connected to the water jetting box and the second water jetting steam extractor respectively.
3. The water-proof plug water jetting steam vacuum system according to claim 2, characterized in that: The first water pumping gates include two, and the water-jetting and air-evacuating electric gates include a first water-jetting and air-evacuating electric gate and a second water-jetting and air-evacuating electric gate. The first water pumping gates are respectively arranged between the first water-jetting and steam extractor and the first water-jetting and air-evacuating electric gate, and between the second water-jetting and steam extractor and the second water-jetting and air-evacuating electric gate.
4. The water-proof plug water jetting steam vacuum system according to claim 1, characterized in that: The water jetting steam extractor is connected to the water jetting tank and is used to transport the liquid transported by the water jetting pump to the water jetting tank.
5. The water-proof plug water jetting steam extraction vacuum system according to claim 1, characterized in that: The condensate in the first pipeline is transported to the first pipeline pumping pipe through the first pumping gate, and the condensate in the second pipeline is transported to the second pipeline pumping pipe through the second pumping gate.
6. The water-proof plug water jetting steam vacuum system according to claim 1, characterized in that: The second pipeline is provided with a sewage discharge door.
7. The water-proof plug water jetting steam vacuum system according to claim 1, characterized in that: The second pipeline is provided with a vacuum breaking door.
8. The water-proof plug water jetting steam vacuum system according to claim 1, characterized in that: The condenser is connected to the circulating water pump and the condensate pump respectively.
9. The water-proof plug water jetting steam vacuum system according to claim 1, characterized in that: The water jetting tank is connected with a water jetting replenishment pipe, which is used to replace water and cool down the water jetting tank when the temperature of the water jetting tank is greater than a preset threshold.
10. The water-proof plug water jetting steam extraction vacuum system according to claim 9, characterized in that: The water jetting tank is connected to an overflow pipe, and the other end of the overflow pipe is connected to a water storage tank, so that when the water jetting replenishment pipe transports liquid to the water jetting tank, the excess liquid in the water jetting tank flows into the water storage tank through the overflow pipe.