Water supply device for water seal system of steam-jet air ejector and steam-jet vacuum system
Patent Information
- Application Number
- CN202522220982.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-21
AI Technical Summary
[0003]射汽抽气器运行一段时间后，水封水量不足，导致水封系统破坏，需重新投运
本实用新型提供的射汽抽气器水封系统的补水装置，通过将水封罐串联于三级疏水管道，利用其进水口低于出水口的竖直布局形成稳定水位基础，结合液位检测器实时监测罐内液位，控制器根据检测数据联动连接管上的控制阀自动通断，实现除盐水母管向水封罐的精准补水，既能通过持续维持密封水位避免水封破坏导致的空气倒灌与机组真空度下降，省去频繁启停射汽抽气器及水环真空泵的操作，减少蒸汽浪费和厂用电消耗，降低真空泵的额外磨损，又能通过自动化控制替代人工补水，大幅降低运维成本与操作误差风险，同时利用水封罐与母管的压力差及结构设计保障补水稳定性，避免母管压力波动对水封液位的干扰，确保系统持续可靠运行，显著提升机组经济性与稳定性。
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Figure CN224838531U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steam jet ejector technology, and in particular to a water supply device for a steam jet ejector water seal system and a steam jet vacuum system. Background Technology
[0002] Steam ejectors are key equipment in the condensing system of thermal power units. They use the principle of steam injection to extract non-condensable gases from the condenser to maintain a high vacuum.
[0003] After the steam ejector has been running for a period of time, the water seal volume becomes insufficient, leading to damage to the water seal system and requiring restarting. Restarting necessitates shutting down the steam ejector and starting the water ring vacuum pump to maintain the unit's back pressure. This results in steam waste (approximately 1.5 tons / cycle) and additional plant power consumption (approximately 120 kWh / cycle). Furthermore, manual water replenishment is required 2-3 times per week, leading to high maintenance costs. Starting the water ring vacuum pump increases its wear rate by more than 30%, highlighting the urgent need for improvement. Utility Model Content
[0004] The purpose of this invention is to provide a water replenishment device for a steam jet ejector water seal system and a steam jet vacuum system to solve the problems existing in the prior art, enabling automatic water replenishment and reducing operation and maintenance costs.
[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a water replenishment device for a steam jet vacuum system, including a water seal tank, a control valve, a level detector, and a controller. The water seal tank is connected in series on the three-stage drainage pipeline of the steam jet vacuum system and is connected to the demineralized water main pipe via a connecting pipe. In the vertical direction, the inlet of the water seal tank is lower than the outlet of the water seal tank. The control valve is located on the connecting pipe and can control the opening and closing of the connecting pipe. The detection end of the level detector is located inside the water seal tank, and the level detector is used to detect the liquid level height inside the water seal tank. The controller is communicatively connected to both the control valve and the level detector.
[0006] Preferably, the control valve includes an electric valve connected in series with the connecting pipe; the electric valve is capable of controlling the opening and closing of the connecting pipe; the electric valve is communicatively connected to the controller.
[0007] Preferably, the control valve further includes a manual valve, which is connected in series on the connecting pipe and is arranged in parallel with the electric valve.
[0008] Preferably, a flow meter is installed on the connecting pipe.
[0009] Preferably, a check valve is provided on the connecting pipe.
[0010] Preferably, the liquid level detector is a liquid level gauge.
[0011] This utility model also provides a steam jet vacuum system, including a water supply device for the steam jet ejector water seal system as described in any of the preceding claims, a steam power supply system, a condensing device, a secondary steam ejector, a tertiary steam ejector, and at least one primary steam ejector; the steam power supply system is used to provide steam power to the working steam inlets of the secondary steam ejector, the tertiary steam ejector, and each of the primary steam ejectors; the condensing device includes a first condensing cavity, a second condensing cavity, and a third condensing cavity that are independent of each other; the output port of the first condensing cavity is provided with a first drainage channel; the output port of the second condensing cavity is provided with a second drainage channel; the output port of the third condensing cavity is provided with a third drainage channel; the end outlet of the second drainage channel is connected to the first drainage channel, and the... The end outlet of the three drainage channels is connected to the second drainage channel; and the end outlet of the third drainage channel is higher than the end opening of the second drainage channel; the water seal tank is installed on the connecting pipe between the third drainage channel and the second drainage channel; the gas inlet of each of the first-stage steam ejectors is used to draw in non-condensable gas from the condenser; and the mixed steam outlet of the first-stage steam ejector is connected to the inlet of the first condensing cavity; the gas inlet of the second-stage steam ejector is connected to the first condensing cavity; and the mixed steam outlet of the second-stage steam ejector is connected to the inlet of the second condensing cavity; the gas inlet of the third-stage steam ejector is connected to the second condensing cavity; and the mixed steam outlet of the third-stage steam ejector is connected to the inlet of the third condensing cavity.
[0012] Preferably, there are two primary steam ejectors, and each connecting pipe of the primary steam ejector is equipped with a control valve.
[0013] Preferably, a pressure stabilizing tank is connected in series on the main pipeline supplying the steam power supply system to the secondary steam ejector, the tertiary steam ejector and each of the primary steam ejectors.
[0014] Preferably, the liquid in the first hydrophobic channel is used to discharge to the exhaust device.
[0015] The present invention achieves the following technical advantages over the prior art: The water replenishment device for the steam ejector water seal system provided by this utility model connects the water seal tank in series with a three-stage drainage pipeline. Utilizing its vertical layout, with the inlet lower than the outlet, a stable water level base is formed. Combined with a level detector that monitors the tank level in real time, the controller automatically switches the control valve on the connecting pipe based on the detection data. This achieves precise water replenishment from the demineralized water header to the water seal tank. It not only maintains a continuous sealing water level to prevent air backflow and a drop in unit vacuum caused by water seal failure, but also eliminates the need for frequent start-stop operations of the steam ejector and water ring vacuum pump, reducing steam waste and plant power consumption, and minimizing wear on the vacuum pump. Furthermore, it replaces manual water replenishment with automated control, significantly reducing maintenance costs and operational error risks. Simultaneously, the pressure difference between the water seal tank and the header, along with the structural design, ensures water replenishment stability, preventing interference from header pressure fluctuations on the water seal level, ensuring continuous and reliable system operation, and significantly improving the unit's economy and stability.
[0016] This utility model also provides a steam jet vacuum system. Through the integrated design of the water seal system of the steam jet ejector, the water supply device, and the multi-stage steam ejectors and independent condensing cavities, it achieves multiple technical advantages: the steam power supply system provides stable power to each stage of the ejectors, and the series extraction structure of the first, second, and third stage steam ejectors can progressively increase the negative pressure of the extraction, efficiently extracting non-condensable gases in the condenser and significantly enhancing the vacuum maintenance capability; the independent first, second, and third condensing cavities, together with the graded drainage channels, form a stepped drainage path, which not only ensures the orderly discharge of condensate but also enhances the water seal effect by utilizing the height difference, reducing the risk of air backflow; and the water seal tank set on the connecting pipe between the third and second drainage channels, together with the liquid level detection and automatic control function of the water supply device, can maintain a stable water level in real time, ensuring the sealing reliability of the multi-stage drainage system; ultimately, it achieves multiple benefits such as improved system extraction efficiency, enhanced operational stability, and optimized unit economy. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 A schematic diagram of the overall structure of the water supply device for the steam ejector water seal system provided by this utility model. Figure 2 A schematic diagram showing the location of the water supply device for the steam jet vacuum system provided by this utility model in the original steam jet vacuum system (circled in red). Figure 3A schematic diagram showing the water supply device of the steam ejector water seal system provided by this utility model connected to the third drainage channel.
[0019] In the picture: 1-Steam power supply system; 101-Steam from the fourth stage extraction stage; 102-Steam from the deaerator exhaust; 103-Pressure stabilizing tank; 2-Condensation device; 201-First condensation cavity; 202-Second condensation cavity; 203-Third condensation cavity; 204-First drainage channel; 205-Second drainage channel; 206-Third drainage channel; 301 - First-stage steam ejector; 302 - Second-stage steam ejector; 303 - Third-stage steam ejector; 4-Exhaust device; 5-Water seal tank; 501-Level detector; 502-Check valve; 503-Flow meter; 504-Electric valve; 505-Manual valve; 506-Demineralized water header. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] The purpose of this invention is to provide a water replenishment device for a steam jet ejector water seal system and a steam jet vacuum system to solve the problems existing in the prior art, enabling automatic water replenishment and reducing operation and maintenance costs.
[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0023] Example 1 This embodiment provides a water supply device for a steam ejector water seal system, such as... Figures 1-3 As shown, the system includes a water seal tank 5, a control valve, a level detector 501, and a controller. The water seal tank 5 is connected in series on the three-stage condensate drain pipe of the steam jet vacuum system. The water seal tank 5 is connected to the demineralized water main pipe 506 via a connecting pipe. In the vertical direction, the inlet of the water seal tank 5 is lower than the outlet of the water seal tank 5. The control valve is located on the connecting pipe and can control the opening and closing of the connecting pipe. The detection end of the level detector 501 is located inside the water seal tank 5, and the level detector 501 is used to detect the liquid level height inside the water seal tank 5. The controller is communicatively connected to both the control valve and the level detector 501.
[0024] By connecting the water seal tank 5 in series with the three-stage drainage pipeline, a stable water level foundation is formed by utilizing its vertical layout where the inlet is lower than the outlet. Combined with the real-time monitoring of the liquid level in the tank by the liquid level detector 501, the controller automatically opens and closes the control valve on the connecting pipe based on the detection data, realizing precise water replenishment from the demineralized water header 506 to the water seal tank 5. This not only prevents air backflow and unit vacuum reduction caused by water seal failure by continuously maintaining the sealed water level, but also eliminates the need for frequent start-stop operations of the steam ejector and water ring vacuum pump, reducing steam waste and plant power consumption, and reducing additional wear on the vacuum pump. Furthermore, the automated control replaces manual water replenishment, significantly reducing operation and maintenance costs and operational error risks. At the same time, the pressure difference between the water seal tank 5 and the header and the structural design ensure the stability of water replenishment, avoiding interference from header pressure fluctuations on the water seal level, ensuring continuous and reliable system operation, and significantly improving the unit's economy and stability.
[0025] Specifically, automatic water replenishment is achieved through closed-loop control of water level and valves.
[0026] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the control valve includes an electric valve 504, which is connected in series to the connecting pipe; the electric valve 504 can control the opening and closing of the connecting pipe; the electric valve 504 is communicatively connected to the controller.
[0027] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the control valve also includes a manual valve 505, which is connected in series on the connecting pipe and is configured in parallel with the electric valve 504. Specifically, the manual and automatic dual-mode design ensures system reliability.
[0028] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, a flow meter 503 is installed on the connecting pipe.
[0029] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, a check valve 502 is installed on the connecting pipe.
[0030] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, level detector 501 is a level gauge.
[0031] Example 2 This embodiment provides a vapor injection vacuum system, such as... Figures 1-3As shown, the system includes a water supply device for the steam ejector water seal system of Embodiment 1, a steam power supply system 1, a condensing device 2, a secondary steam ejector 302, a tertiary steam ejector 303, and at least one primary steam ejector 301 (two are provided, one for winter and the other for summer); the steam power supply system 1 provides steam power to the working steam inlets of the secondary steam ejector 302, the tertiary steam ejector 303, and each primary steam ejector 301; the condensing device 2 includes independent first condensing cavities 201. The second condensing cavity 202 and the third condensing cavity 203; the outlet of the first condensing cavity 201 is provided with a first drainage channel 204 (the condensing device 2 is a condenser, and the condensing cavity of the condenser is divided into the first condensing cavity 201, the second condensing cavity 202 and the third condensing cavity 203 by a partition; one path of condensate water is used for heat exchange through the condenser, the second path of condensate water is connected in parallel with the path supplied to the condenser to one end of the condenser's condensing outlet; the third path of condensate water is directly supplied, and these three paths of condensate water are finally collected and supplied to the shaft seal heater); the second condensing cavity 202 and the third condensing cavity 203; the outlet of the first condensing cavity 201 is provided with a first drainage channel 204 (the condensing device 2 is a condenser, and the condensing cavity of the condenser is divided into the first condensing cavity 201, the second condensing cavity 202 and the third condensing cavity 203 by a partition, the third path of condensate water is directly supplied, and these three paths of condensate water are finally collected and supplied to the shaft seal heater); the second condensing cavity 202 and the third condensing cavity 203; the outlet of the first condensing cavity 201 is provided with a first drainage channel 204 (the condensing device 2 is a condenser, and the condensing cavity of the condenser is divided into the first condensing cavity 201, ... The outlet of cavity 202 is provided with a second drain channel 205; the outlet of the third condensing cavity 203 is provided with a third drain channel 206; the end outlet of the second drain channel 205 is connected to the first drain channel 204, and the end outlet of the third drain channel 206 is connected to the second drain channel 205; and the end outlet of the third drain channel 206 is higher than the end opening of the second drain channel 205; a water seal tank 5 is provided on the connecting pipe between the third drain channel 206 and the second drain channel 205; the pumped steam of each first-stage steam ejector 301 is... The gas inlet is used to draw in non-condensable gas from the condenser; and the mixed steam outlet of the first-stage steam ejector 301 is connected to the inlet of the first condensing cavity 201; the gas inlet of the second-stage steam ejector 302 is connected to the first condensing cavity 201; and the mixed steam outlet of the second-stage steam ejector 302 is connected to the inlet of the second condensing cavity 202; the gas inlet of the third-stage steam ejector 303 is connected to the second condensing cavity 202; and the mixed steam outlet of the third-stage steam ejector 303 is connected to the inlet of the third condensing cavity 203.
[0032] By integrating the water supply device of the steam ejector water seal system with the multi-stage steam ejectors and independent condensing cavities, multiple technical advantages are achieved: the steam power supply system 1 provides stable power to each stage of the ejectors, and combined with the series extraction structure of the first, second, and third stage steam ejectors 303, the extraction negative pressure can be increased step by step, efficiently extracting non-condensable gases in the condenser and significantly enhancing the vacuum maintenance capability; the independent first, second, and third condensing cavities 203, together with the graded drainage channels, form a stepped drainage path, which not only ensures the orderly discharge of condensate, but also enhances the water seal effect by utilizing the height difference, reducing the risk of air backflow; and the water seal tank 5 set on the connecting pipe of the third and second drainage channels 205, together with the liquid level detection and automatic control function of the water supply device, can maintain a stable water level in real time, ensuring the sealing reliability of the multi-stage drainage system; ultimately, multiple benefits are achieved, including improved system extraction efficiency, enhanced operational stability, and optimized unit economy.
[0033] Specifically, the steam source of the steam power supply system 1 comes from the fourth-stage extraction steam 101 and the deaerator exhaust steam 102.
[0034] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 As shown, there are two primary steam ejectors 301, and each connecting pipe of the primary steam ejector 301 is equipped with a control valve.
[0035] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 As shown, a pressure stabilizing tank 103 is connected in series on the main pipeline that supplies steam power supply system 1 to the secondary steam ejector 302, the tertiary steam ejector 303 and each primary steam ejector 301.
[0036] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 As shown, the liquid in the first drainage channel 204 is used to discharge to the exhaust device 4.
[0037] Specifically, in this embodiment, the steam jet vacuum system differs from other existing steam jet vacuum systems in that the condensation method of the condensing device 2 and the first-stage steam ejector 301, the second-stage steam ejector 302, and the third-stage steam ejector 303 is different from the condensation method of other existing steam jet vacuum systems, and a water supply device for the steam jet ejector water seal system of Embodiment 1 is added. Other settings are the same as those of existing equipment. Other necessary valves, wastewater discharge, shaft heater (shaft seal heater), condensate tank, vacuum pump, condensate pit, small machine vacuum pipeline, exhaust steam vacuum pipeline, etc. can be reasonably set as needed.
[0038] Specifically, Figure 2 The term "condensate water" refers to water coming from the outlet of the condensate pump.
[0039] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A water supply device for a steam ejector water seal system, characterized in that: Includes water seal tank, control valve, level detector and controller; The water seal tank is used to be installed in series on the three-stage condensate drain pipe of the steam jet vacuum system. The water seal tank is connected to the demineralized water main pipe through a connecting pipe. In the vertical direction, the water inlet of the water seal tank is lower than the water outlet of the water seal tank. The control valve is installed on the connecting pipe, and the control valve can control the opening and closing of the connecting pipe; The detection end of the liquid level detector is located inside the water seal tank, and the liquid level detector is used to detect the liquid level height inside the water seal tank; The controller is communicatively connected to the control valve and the liquid level detector.
2. The water supply device for the steam ejector water seal system according to claim 1, characterized in that: The control valve includes an electric valve, which is connected in series to the connecting pipe; the electric valve can control the opening and closing of the connecting pipe; the electric valve is communicatively connected to the controller.
3. The water replenishment device for the steam ejector water seal system according to claim 2, characterized in that: The control valve also includes a manual valve, which is connected in series on the connecting pipe and is arranged in parallel with the electric valve.
4. The water supply device for the steam ejector water seal system according to claim 1, characterized in that: A flow meter is installed on the connecting pipe.
5. The water replenishment device for the water seal system of the steam ejector according to claim 1, characterized in that: A check valve is installed on the connecting pipe.
6. The water replenishment device for the water seal system of the steam ejector according to claim 1, characterized in that: The liquid level detector is a liquid level gauge.
7. A vapor injection vacuum system, characterized in that: It includes a water supply device, a steam power supply system, a condenser, a secondary steam ejector, a tertiary steam ejector, and at least one primary steam ejector for the steam ejector water seal system as described in any one of claims 1 to 6. The steam power supply system is used to provide steam power to the working steam inlets of the secondary steam ejector, the tertiary steam ejector and each of the primary steam ejectors; The condensation device includes a first condensation cavity, a second condensation cavity, and a third condensation cavity that are independent of each other; the first condensation cavity has a first drainage channel at its output port; the second condensation cavity has a second drainage channel at its output port; and the third condensation cavity has a third drainage channel at its output port; the end outlet of the second drainage channel is connected to the first drainage channel, and the end outlet of the third drainage channel is connected to the second drainage channel; and the end outlet of the third drainage channel is higher than the end opening of the second drainage channel. The water seal tank is installed on the connecting pipe between the third drainage channel and the second drainage channel; The gas inlet of each of the first-stage steam ejectors is used to draw in non-condensable gas from the condenser; and the mixed steam outlet of each of the first-stage steam ejectors is connected to the inlet of the first condensation cavity. The gas inlet of the secondary steam ejector is connected to the first condensing cavity; and the mixed steam outlet of the secondary steam ejector is connected to the inlet of the second condensing cavity. The inlet of the pumped gas of the three-stage steam ejector is connected to the second condensing cavity; and the outlet of the mixed steam of the three-stage steam ejector is connected to the inlet of the third condensing cavity.
8. The vapor injection vacuum system according to claim 7, characterized in that: There are two primary steam ejectors, and each connecting pipe of the primary steam ejector is equipped with a control valve.
9. The vapor injection vacuum system according to claim 7, characterized in that: A pressure stabilizing tank is connected in series on the main pipeline that supplies steam power to the secondary steam ejector, the tertiary steam ejector and each of the primary steam ejectors.
10. The vapor injection vacuum system according to claim 7, characterized in that: The liquid in the first hydrophobic channel is used to discharge to the exhaust device.