Turbine multi-stage water seal water level accurate control device

Abstract

The utility model belongs to the technical field of steam turbine shaft seal heater water seal equipment, and relates to a steam turbine multi-stage water seal water level accurate control device which comprises a condenser, the condenser is connected to a multi-stage water seal through a water seal pipeline, a water seal valve is arranged on the water seal pipeline, a first electronic liquid level meter is arranged on the multi-stage water seal, and a second electronic liquid level meter is arranged on the first electronic liquid level meter. One side of the top of the multi-stage water seal is connected to a shaft seal heater through a heating pipeline, a heating valve is arranged on the heating pipeline, a second electronic liquid level meter is arranged on the shaft seal heater, the bottom of the multi-stage water seal is connected to a condensate water mother pipe through a leading-out pipeline, and a pneumatic adjusting valve is arranged on the leading-out pipeline and electrically connected to a DCS. The steam turbine multi-stage water seal water level control system achieves double requirements of energy conservation and safe operation, efficiently achieves accurate control of the steam turbine multi-stage water seal water level, drains water from the shaft seal heater to the condenser smoothly, and prevents vacuum leakage of the multi-stage water seal water level from being too low to affect vacuum of the condenser and economical efficiency of a unit.

Description

Technical Field

[0001] This utility model belongs to the technical field of steam turbine shaft seal heater water seal equipment, specifically relating to a steam turbine multi-stage water seal water level precision control device. Background Technology

[0002] A multi-stage water seal consists of a series of vertically or inclined water seal chambers. Each water seal chamber is connected by a small hole or overflow port. Each water seal chamber maintains a certain water level, forming a water seal column. Its functions are: 1. To effectively prevent steam in the shaft seal heater from entering the condenser or the next stage heater, thus avoiding affecting the condenser vacuum and cycle thermal efficiency; 2. To ensure unobstructed drainage, allowing the condensate from the shaft seal heater and other equipment to be discharged smoothly, maintaining the normal condensate level in the shaft seal heater, and ensuring the heat exchange effect and stable shaft seal pressure of the equipment.

[0003] During steam turbine operation, multi-stage water seals often face the problem of unstable water levels. If the water level is too low, it can lead to seal failure, allowing air to leak into the condenser and affecting vacuum; if the water level is too high, it may cause malfunctions such as poor drainage. Traditional manual water replenishment methods suffer from insufficient timeliness and accuracy, failing to meet the requirements for efficient and stable operation. Therefore, a precise water level control device for multi-stage steam turbine water seals is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a precise water level control device for multi-stage water seals in steam turbines, which has the function of precise water level control for multi-stage water seals in steam turbines and solves the problem of unstable water level that often exists in existing multi-stage water seal technologies.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a multi-stage water seal water level precision control device for steam turbines, including a condenser. The condenser is connected to the multi-stage water seal through a water seal pipe. An electronic level gauge is installed on the multi-stage water seal. The top side of the multi-stage water seal is connected to the shaft seal heater through a heating pipe. An electronic level gauge is installed on the shaft seal heater. The bottom of the multi-stage water seal is connected to the condensate header pipe through an outlet pipe. A pneumatic regulating valve is installed on the outlet pipe and is electrically connected to the DCS.

[0006] Preferably, a water seal valve is installed on the water seal pipe, and a heating valve is installed on the heating pipe.

[0007] Preferably, both the electronic level gauge 1 and the electronic level gauge 2 are differential pressure level transmitters or magnetic level gauges with remote transmission.

[0008] Preferably, the multi-stage water seal is a U-shaped pipe water seal structure with at least three stages.

[0009] Preferably, the water seal pipe, heating pipe, and outlet pipe are all stainless steel pipes.

[0010] Preferably, the connection point of the electronic level gauge is located on the water chamber of the intermediate stage of the multi-stage water seal or on the cylinder of the highest-level water seal.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. This utility model achieves the dual requirements of energy saving and safe operation, efficiently realizes precise control of the multi-stage water seal level of the steam turbine, ensures smooth drainage from the shaft seal heater to the condenser, and prevents vacuum leakage caused by excessively low multi-stage water seal level, which would affect the vacuum of the condenser and the economy of the unit.

[0013] 2. This utility model has the function of precise control of water level of multi-stage water seal in steam turbine, which solves the problem of unstable water level that often exists in the multi-stage water seal of the prior art. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a multi-stage water seal precise water level control device for a steam turbine according to one embodiment;

[0016] In the above diagram, 1. Condenser, 2. Water seal pipe, 3. Water seal valve, 4. Multi-stage water seal, 5. Electronic level gauge one, 6. Heating pipe, 7. Shaft seal heater, 8. Heating valve, 9. Electronic level gauge two, 10. Condensate header, 11. Pneumatic control valve, 12. DCS, 13. Outlet pipe. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example 1, as Figure 1As shown, a multi-stage water seal 4 water level precision control device for a steam turbine includes a condenser 1. The condenser 1 receives exhaust steam from the steam turbine and condenses it into water to maintain a vacuum environment. It is the starting point of the condensate drainage system and also serves as the water source, ensuring a continuous water supply to the multi-stage water seal 4 and preventing the water seal from failing due to water shortage. The condenser 1 is connected to the multi-stage water seal 4 through a water seal pipe 2. The multi-stage water seal 4 forms water seal columns step by step through its internal water seal structure, preventing steam / air from the shaft seal heater 7 from flowing back into the condenser 1, protecting the vacuum of the condenser 1, and allowing condensate to overflow step by step to the bottom for discharge.

[0020] An electronic level gauge 5 is installed on the multi-stage water seal 4. The electronic level gauge 5 monitors the water level at the core position of the multi-stage water seal 4 in real time. The top side of the multi-stage water seal 4 is connected to the shaft seal heater 7 through a heating pipe 6. The shaft seal heater 7 recovers the heat from the steam leakage from the turbine shaft seal and heats the condensate. The condensate is discharged through the multi-stage water seal 4, improving the system's thermal efficiency. At the same time, the water seal isolates the steam, preventing it from affecting the vacuum of the condenser 1. An electronic level gauge 9 is installed on the shaft seal heater 7. The electronic level gauge 9 monitors the condensate level of the shaft seal heater 7 and determines the condensate flow. The electronic level gauge 9 and the level gauge 5 work together to verify the system status. For example, if the electronic level gauge 9 is too high and the electronic level gauge 5 is too low, it indicates pipe blockage, preventing overflow failure and avoiding water entering the turbine due to the shaft seal heater 7 being full of water.

[0021] The bottom of the multi-stage water seal 4 is connected to the condensate header 10 via an outlet pipe 13. The outlet pipe 13 transports the drainage from the multi-stage water seal 4 to the condensate header 10 for recycling. The condensate is recycled into the thermal cycle, improving energy efficiency. A pneumatic regulating valve 11 is installed on the outlet pipe 13. The pneumatic regulating valve 11 is controlled by the DCS 12 to regulate the drainage flow, maintain a constant water seal level, withstand high-temperature steam environments, and has high reliability. The pneumatic regulating valve 11 is electrically connected to the DCS 12. The DCS 12 receives real-time signals from electronic level gauges 5 and 9, and dynamically adjusts the opening of the pneumatic regulating valve 11 using a PID algorithm (e.g., closing the valve to reduce drainage when the water level is low). This achieves fully automatic control, replacing manual intervention, eliminating response delays, triggering alarms and linking shutdown protection when the water level is abnormal.

[0022] The specific design of the aforementioned key components will be discussed in detail below:

[0023] A water seal valve 3 is installed on the water seal pipe 2, and a heating valve 8 is installed on the heating pipe 6. The water seal valve 3 controls the opening and closing of the water seal pipe 2, which can isolate the condenser 1 from the multi-stage water seal 4, facilitating maintenance. The heating valve 8 controls the opening and closing of the heating pipe 6, which can isolate the shaft seal heater 7 from the multi-stage water seal 4.

[0024] Both electronic level gauge 5 and electronic level gauge 9 are differential pressure level transmitters or magnetic level gauges with remote transmission. Electronic level gauge 5 is preferably a differential pressure level transmitter for the harsh working conditions of the multi-stage water seal 4, while electronic level gauge 9 can be a magnetic level gauge with remote transmission for the shaft seal heater 7, which also ensures visibility and provides a continuous electrical signal to provide real-time data support for the DCS12 dynamic regulating pneumatic valve.

[0025] The multi-stage water seal 4 features at least three U-shaped pipe water seal structures. Each U-shaped pipe forms an independent water seal column, automatically resetting when the water level fluctuates, offering superior stability compared to straight-tube structures. The U-shaped bends prevent gas leakage, eliminating drainage interruptions caused by "air blockage." The water seal pipe 2, heating pipe 6, and outlet pipe 13 are all made of stainless steel. The stainless steel used is SUS304 / 316L, ensuring complete sealing and durability.

[0026] The electronic level gauge 5 connection point is located on the water chamber of the intermediate stage of the multi-stage water seal 4 or on the cylinder of the highest-level water seal. The intermediate-stage water chamber, such as the second stage of a 3-stage water seal, can reflect the system's equilibrium water level, avoiding inlet disturbances and drainage lag, and serves as the main control signal for DCS12 to achieve stable control; the highest-level cylinder directly monitors the weak points of the seal, and immediately alarms when the water level is below the threshold to prevent vacuum leakage.

[0027] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A device for accurate control of water level in multi-stage water seal of steam turbine, characterized in that, The system includes a condenser connected to a multi-stage water seal via a water seal pipe. An electronic level gauge is installed on the multi-stage water seal. The top side of the multi-stage water seal is connected to a shaft seal heater via a heating pipe. An electronic level gauge is installed on the shaft seal heater. The bottom of the multi-stage water seal is connected to a condensate header via an outlet pipe. A pneumatic regulating valve is installed on the outlet pipe and is electrically connected to a DCS.

2. A device for precise control of water level in a multi-stage water seal of a steam turbine according to claim 1, characterized in that, A water seal valve is installed on the water seal pipe, and a heating valve is installed on the heating pipe.

3. A device for precise control of water level in multi-stage water seal of steam turbine as claimed in claim 1 wherein, Both electronic level gauge 1 and electronic level gauge 2 are differential pressure level transmitters or magnetic level gauges with remote transmission.

4. A device for precise control of water level in a multi-stage water seal of a steam turbine according to claim 1, characterized in that, The multi-stage water seal is a U-shaped pipe water seal structure with at least three stages.

5. A device for precise control of water level in multi-stage water seal of steam turbine as claimed in claim 1 wherein, The water seal pipe, heating pipe, and outlet pipe are all made of stainless steel.

6. A device for precise control of water level in a multi-stage water seal of a steam turbine according to claim 1, characterized in that, The connection point of the electronic level gauge is located on the water chamber of the intermediate stage of the multi-stage water seal or on the cylinder of the highest-level water seal.

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