Door fixing rod leakage steam recovery device

Abstract

The utility model discloses a steam leakage recovery device for a valve rod of a main steam valve of a steam turbine in a thermal power plant. Aiming at the problems of energy waste, relatively high indoor temperature and humidity and potential safety hazards caused by direct discharge of leaked steam in the prior art, the device is improved through the following structure: each leaked steam discharge port of a main steam valve of a steam turbine is connected to a convergence bin through an eduction tube, and the leaked steam enters a spiral cooling tube of a shaft seal cooler through a connecting tube; low-temperature industrial water is introduced into a water inlet pipe and a water outlet pipe at the two ends of the shaft seal cooler for heat exchange, and steam is condensed into room-temperature liquid which is discharged into a trench through a discharge pipe. The core innovation points include that the spiral cooling pipe increases the heat exchange area, the flexible eduction pipe adapts to thermal expansion displacement, and the intelligent adjusting valve maintains low-temperature operation of industrial water. The device can recover steam heat for factory heat supply, reduces indoor temperature and humidity, eliminates scald and insulation hidden dangers, and has the advantages of energy conservation, safety and easiness in maintenance.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, and in particular to a device for recovering steam leakage from the main steam valve stem of a steam turbine. Background Technology

[0002] In the field of thermal power generation, steam leakage from the main steam valve stem of a steam turbine has long been a technical challenge. Because the valve stem sealing structure is prone to wear or thermal deformation under high temperature and pressure conditions, steam leaks through the gap between the valve stem and the valve body. The steam leakage from the main steam valve stem of a single 600MW unit can reach 1.5-2.0 tons per hour. If directly discharged, the annual heat loss would be equivalent to thousands of tons of standard coal, resulting in significant energy waste.

[0003] Existing technologies mostly employ direct venting into the atmosphere or simple outdoor exposure, which has multiple drawbacks:

[0004] Serious energy waste: High-temperature steam (250-400℃, pressure 0.5-1.0MPa) is not recovered; the annual steam leakage of a single unit is equivalent to approximately 30,000 tons of steam, resulting in an energy loss equivalent to 1.2 × 10⁻⁶ tons. 7 kilowatt-hours of electricity.

[0005] Environmental and equipment hazards: Vapor leakage and diffusion lead to indoor humidity exceeding 85% and temperature rising by 5-8℃, accelerating the aging of electrical equipment insulation. A certain power plant experienced more than 3 insulation failures per year.

[0006] The safety risks are significant: high-temperature steam can easily cause burns, and hot water (60-80℃) discharged into the drain exacerbates the heat island effect in the workshop, with summer temperatures reaching over 40℃.

[0007] In summary, there is an urgent need for a gate valve steam recovery device that is compact, has high heat exchange efficiency, and is highly adaptable, in order to solve the problems of energy waste, environmental degradation, and safety hazards, and meet the long-term stable operation requirements of power plants. Utility Model Content

[0008] To address the technical problems existing in the background art, this utility model proposes a steam recovery device for a fixed gate rod.

[0009] This utility model proposes a steam leakage recovery device for a fixed valve stem, including a turbine main steam valve, wherein the side wall of the turbine main steam valve is provided with several leakage discharge ports, and the device further includes:

[0010] A collection chamber is used to collect leaking vapor;

[0011] A shaft seal cooler has a cooling pipe inside, one end of which is connected to the collection chamber via a connecting pipe, and the other end is connected to the discharge pipe;

[0012] Each leakage discharge port of the main steam valve of the steam turbine is connected to the collection chamber through a discharge pipe;

[0013] The shell of the shaft seal cooler is connected to an inlet pipe and an outlet pipe at both ends. The inlet pipe is used to introduce industrial water from the plant area, and the outlet pipe is used to discharge the industrial water after heat exchange.

[0014] The discharge pipe is used to drain the condensed liquid in the cooling pipe into the trench.

[0015] Preferably, the cooling pipe has a spiral structure and extends along the length of the shaft seal cooler to increase the contact area between leaking steam and industrial water.

[0016] Preferably, the housing of the shaft seal cooler is provided with a guide plate, which is located outside the cooling pipe and is used to guide industrial water to form turbulence and uniformly cover the surface of the cooling pipe.

[0017] Preferably, the outlet pipe is a flexible metal corrugated pipe, one end of which is welded and sealed to the gas leakage outlet, and the other end is detachably connected to the collection chamber through a flange.

[0018] Preferably, the inner wall of the collection chamber is provided with an anti-corrosion coating, the coating thickness is 0.5-1 mm, and the material is polytetrafluoroethylene or epoxy resin.

[0019] Preferably, the inlet pipe and the outlet pipe are respectively equipped with a flow meter and a regulating valve. The regulating valve automatically adjusts its opening according to the water temperature signal of the outlet pipe to maintain the water temperature in the shaft seal cooler within the range of 15-25℃.

[0020] The steam leakage recovery device for a fixed gate rod proposed in this utility model has the following technical effects:

[0021] Energy saving and consumption reduction: The shaft seal cooler recovers steam heat, reducing energy waste;

[0022] Environmental optimization: The condensed hydrophobic material is close to room temperature, preventing an increase in indoor temperature and humidity;

[0023] Safety Enhancement: Eliminates the risk of burns from high-temperature steam and reduces potential insulation hazards in electrical equipment;

[0024] Easy maintenance: The outlet pipe is made of flexible metal corrugated pipe, which can adapt to different installation positions, and the collection chamber can be disassembled and cleaned.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2This is a structural schematic diagram of the convergence chamber of this utility model from the perspective of its design.

[0028] Figure 3 This is the front view of the present invention.

[0029] The following are the labels in the diagram: 1. Main steam valve of the steam turbine; 101. Outlet pipe; 2. Collection bin; 3. Connecting pipe; 4. Shaft seal cooler; 401. Cooling pipe; 402. Water inlet pipe; 403. Water outlet pipe; 404. Discharge pipe. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] like Figures 1-3 A steam leakage recovery device for a fixed gate rod, as shown, includes:

[0032] The main steam valve 1 of the steam turbine has several leakage discharge ports on its side wall;

[0033] Collection chamber 2 is used to collect leaking steam;

[0034] The shaft seal cooler 4 has a cooling pipe 401 inside. One end of the cooling pipe 401 is connected to the collection chamber 2 through the connecting pipe 3, and the other end is connected to the discharge pipe 404.

[0035] The industrial water system includes an inlet pipe 402 and an outlet pipe 403, which are respectively connected to both ends of the shell of the shaft seal cooler 4, for introducing low-temperature industrial water and discharging the heat-exchanged hot water.

[0036] The drain pipe 404 is used to drain the condensed liquid in the cooling pipe 401 into the drain.

[0037] Steam leakage collection: Each steam leakage outlet of the turbine main steam valve 1 is connected to the collection bin 2 through the outlet pipe 101 to ensure centralized collection of steam leakage;

[0038] High-efficiency heat exchange: Cooling pipe 401 adopts a spiral shape to increase the contact area between steam and industrial water;

[0039] Intelligent control: Flow meters and regulating valves (not shown in the figure) are installed on the inlet pipe 402 and the outlet pipe 403 to automatically adjust the industrial water flow rate according to the water temperature and maintain the water temperature within the range of 15-25℃.

[0040] Each leakage discharge port of the main steam valve 1 of the steam turbine is connected to the collection chamber 2 through the outlet pipe 101. The outlet pipe 101 is made of high temperature resistant flexible corrugated pipe, and its two ends are welded and sealed to the leakage discharge port and connected to the flange of the collection chamber 2, respectively.

[0041] The inner wall of the convergence chamber 2 is coated with a polytetrafluoroethylene anti-corrosion layer, and the outer wall is equipped with a 3 cm thick insulation layer to reduce heat loss.

[0042] Cooling tube 401 is a spiral copper-nickel alloy tube with an inner diameter of 15 mm and a wall thickness of 1.5 mm, which is coiled along the length of shaft seal cooler 4. Figure 2 ;

[0043] The shaft seal cooler 4 has a baffle plate inside the housing to guide industrial water to form turbulence and evenly cover the surface of the cooling pipe 401.

[0044] High-temperature steam leakage enters the collection chamber 2 through the outlet pipe 101, and then enters the cooling pipe 401 through the connecting pipe 3;

[0045] Low-temperature industrial water at 15-20℃ enters the shell of shaft seal cooler 4 through water inlet pipe 402 and exchanges heat with steam in cooling pipe 401 in a counter-current manner.

[0046] The steam condenses into a room temperature liquid of approximately 25°C, which is then discharged into the sewer through a 404 drain pipe.

[0047] The hot water, at approximately 40-45℃ after heat exchange, is discharged through outlet pipe 403 and can be used for boiler preheating or plant heating.

[0048] The temperature sensor on the discharge pipe 404 monitors the condensate temperature in real time, and the regulating valve automatically adjusts the opening of the inlet pipe 402 according to the water temperature signal to ensure that the industrial water flow matches the steam load.

[0049] The 401 material used for cooling pipes must be able to withstand high steam temperatures of 300-500℃ and corrosion from industrial water.

[0050] The outlet pipe 101 needs to have flexible compensation capabilities to adapt to the thermal expansion displacement of the steam turbine.

[0051] The shaft seal cooler 4 needs to be cleaned regularly to prevent scale from affecting heat exchange efficiency.

[0052] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A kind of door pole steam leakage recovery device, including steam turbine main valve (1), the side wall of the steam turbine main valve (1) is equipped with several air leakage discharge port, it is characterized by: The device also comprises: a gathering bin (2) for collecting the steam leakage; a shaft seal cooler (4) with a cooling pipe (401) inside, one end of the cooling pipe (401) being connected to the gathering bin (2) through a connecting pipe (3), and the other end being connected to a discharge pipe (404); each steam leakage discharge port of the steam turbine main valve (1) being connected to the gathering bin (2) through a discharge pipe (101); the shell of the shaft seal cooler (4) being connected to an inlet pipe (402) and an outlet pipe (403) at both ends, respectively, the inlet pipe (402) being used for guiding the industrial water from the plant area, and the outlet pipe (403) being used for guiding the industrial water after heat exchange; the discharge pipe (404) being used for discharging the condensed liquid in the cooling pipe (401) to a ditch.

2. A device for recovering vapor escaping from a door hinge according to claim 1, wherein The cooling pipe (401) is in a spiral or S-shaped structure, and is arranged along the length direction of the shaft seal cooler (4) to increase the contact area between the steam leakage and the industrial water.

3. The device of claim 1, wherein, The shell of the shaft seal cooler (4) is provided with a flow guide plate outside the cooling pipe (401), which is used for guiding the industrial water to form a turbulent flow and uniformly cover the surface of the cooling pipe (401).

4. The device of claim 1, wherein, The discharge pipe (101) is a flexible metal bellows, one end of which is welded and sealed with the steam leakage discharge port, and the other end is detachably connected to the gathering bin (2) through a flange.

5. The gate lever vapor recovery apparatus of claim 1, wherein: The inner wall of the gathering bin (2) is provided with an anti-corrosion coating, the thickness of the coating is 0.5-1mm, and the material is polytetrafluoroethylene or epoxy resin.

6. The gate lever vapor recovery apparatus of claim 1, wherein: Flow meters and regulating valves are respectively arranged on the inlet pipe (402) and the outlet pipe (403), the regulating valve automatically adjusts the opening degree according to the water temperature signal of the outlet pipe (403), and the water temperature in the shaft seal cooler (4) is maintained within the range of 15-25℃.

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