Heater pipeline bypass exhaust device

Abstract

The utility model discloses a bypass exhaust device for a heater pipeline, which comprises a shaft seal heater, a shaft heating fan arranged at the end part of the shaft seal heater, a bypass pipe arranged on the shaft seal heater, and a storage tank arranged at the end part of the bypass pipe, used for accommodating gas in the shaft seal heater and used for maintaining the pressure balance in the shaft seal heater; the pressure stabilizing part is used for changing the steam storage space in the storage tank so as to control the stability of steam in the shaft seal heater and prevent the shaft heater from being damaged; and the first electric control valve is arranged in the bypass pipe, a pressure difference detection unit is arranged in the first electric control valve and used for detecting the pressure difference in the storage tank and the shaft seal heater, and the first electric control valve controls opening and closing of the bypass pipe according to the pressure difference so as to control conduction of the storage tank and the shaft seal heater. According to the utility model, the bypass gas is recycled, the situation that the load of the axial fan is increased due to frequent starting of bypass exhaust is prevented, and the energy consumption is prevented from rising.

Description

Technical Field

[0001] This utility model relates to the field of shaft seal heater technology, and in particular to a heater pipeline bypass exhaust device. Background Technology

[0002] A shaft seal heater is a device that recovers leaking steam from the shaft seal and uses its heat to heat condensate, reducing energy loss and improving unit thermal efficiency. When a steam turbine adopts an internal leakage shaft seal system, a shaft seal heater is generally installed to heat condensate or demineralized water, recover leaking steam from the shaft seal, thereby reducing steam leakage and heat loss, and improving the environmental conditions in the workshop.

[0003] The prior art disclosed in 201821606165.3 is a steam turbine shaft seal heater exhaust fan drain pipe, which includes a shaft seal heater and an exhaust pipe connected to the shaft seal heater. The front end of the exhaust pipe is divided into a first exhaust fan pipe and a second exhaust fan pipe. The top vertical inner wall of the end exhaust pipe is provided with a baffle plate, and the lower part of the baffle plate is provided with a water collection tank. The bottom of the water collection tank is connected to a pressureless drain funnel through a carbon steel pipe. When the shaft seal heater is overloaded due to insufficient negative pressure or excessive steam leakage, the bypass valve opens to directly discharge part or all of the steam-gas mixture to the atmosphere to avoid system pressure runaway. However, there are still the following shortcomings: direct discharge to the atmosphere leads to loss of steam working fluid, and the heat of high-temperature steam cannot be effectively recovered, reducing the economic efficiency of the unit. Frequent use of bypass exhaust will increase the load on the shaft seal heater fan, resulting in increased energy consumption.

[0004] Therefore, a heater pipeline bypass venting device is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a heater pipeline bypass exhaust device that enables the recovery and reuse of bypass gas and prevents frequent use of bypass exhaust from increasing the load on the shaft fan, thus avoiding increased energy consumption.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a heater pipeline bypass exhaust device, comprising a shaft seal heater, a shaft fan disposed at the end of the shaft seal heater, and a bypass pipe disposed on the shaft seal heater;

[0007] A storage tank, located at the end of the bypass pipe, is used to collect the gas inside the shaft seal heater in order to maintain the pressure balance inside the shaft seal heater.

[0008] A pressure stabilizer is installed inside the storage tank to change the gas collection space inside the storage tank, thereby controlling the gas stability inside the shaft seal heater and preventing damage to the shaft seal fan.

[0009] The first electrically controlled valve is located inside the bypass pipe. The first electrically controlled valve is equipped with a differential pressure detection unit to detect the internal pressure difference between the storage tank and the shaft seal heater. The first electrically controlled valve controls the opening and closing of the bypass pipe according to the pressure difference to control the connection between the storage tank and the shaft seal heater.

[0010] Furthermore, each of the storage tanks is equipped with a pressure detector, which is used to detect the pressure inside the storage tank.

[0011] Furthermore, a cover plate is fixedly installed on the top of the storage tank, and the pressure stabilizing component includes an electric push rod located in the middle of the cover plate;

[0012] The telescopic end of the electric push rod is fixedly mounted with a disc, and the voltage stabilizer also includes a spring fixedly disposed at the bottom of the disc, with a movable disc fixedly disposed at the other end of the spring.

[0013] Furthermore, a first sealing ring is fixedly installed on the outer wall of the disk;

[0014] A second sealing ring is fixedly installed on the outer wall of the movable disc.

[0015] Furthermore, a water level detector is fixedly installed inside the storage tank;

[0016] A control box is fixedly installed on the outside of the storage tank, a controller is installed inside the control box, and a processor is fixedly installed inside the control box.

[0017] The control box is electrically connected to the pressure difference detection unit, the control box is electrically connected to the pressure detector, and the control box is electrically connected to the first solenoid valve.

[0018] Furthermore, a drain pipe is provided on the outer wall of the storage tank and below the exhaust pipe, and a third electrically controlled valve is provided inside the drain pipe;

[0019] The control box is electrically connected to the third solenoid valve.

[0020] The beneficial effects of this utility model are reflected in:

[0021] This invention uses a differential pressure detection unit to monitor the pressure difference between the shaft seal heater and the storage tank. The control box processes the differential pressure, and when the pressure difference is too large, the first electrically controlled valve on the bypass pipe opens, allowing gas to enter the storage tank. The gas then pressurizes the movable disc and spring, preventing repeated direct bypass gas discharge and avoiding damage to the shaft seal blower. When the pressure in the shaft seal heater is even higher, a pressure detector monitors the pressure inside the storage tank. An electric push rod moves the disc and movable disc upwards inside the storage tank, and as the pressure inside the storage tank continues to increase, gas is discharged through the exhaust pipe. When the pressure inside the shaft seal heater decreases, gas from the storage tank enters the shaft seal heater, allowing for the recycling of gas collected inside the storage tank and preventing direct release into the atmosphere, thus avoiding energy waste. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a perspective sectional view of the storage tank of this utility model;

[0024] Figure 3 This is a perspective view of the voltage stabilizer of this utility model;

[0025] Figure 4 This is a three-dimensional bottom view of the voltage stabilizer of this utility model.

[0026] In the picture:

[0027] 1. Shaft seal heater;

[0028] 2. Shaft-mounted fan;

[0029] 3. Bypass pipe;

[0030] 4. First electrically controlled valve;

[0031] 5. Storage tanks;

[0032] 6. Cover plate;

[0033] 7. Pressure stabilizer; 71. Electric actuator; 72. Disc; 73. First sealing ring; 74. Spring; 75. Movable disc; 76. Second sealing ring; 77. Pressure detector;

[0034] 8. Exhaust pipe;

[0035] 9. Drainage pipe. Detailed Implementation

[0036] 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 a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0037] Please see Figure 1-4 This utility model discloses a bypass exhaust device for a heater pipeline, including a shaft seal heater 1, a shaft fan 2 installed at the end of the shaft seal heater 1, and a bypass pipe 3 installed on the shaft seal heater 1. The shaft seal heater 1 is used to collect gas at the turbine shaft seal to prevent gas leakage. The bypass pipe 3 is used to depressurize the shaft seal heater 1. The shaft fan 2 uses suction to discharge uncondensed gas and a small amount of residual steam from the system, maintaining a slight negative pressure inside the shaft seal heater 1.

[0038] Storage tank 5, located at the end of bypass pipe 3, is used to collect the gas inside shaft seal heater 1 to maintain the pressure balance inside shaft seal heater 1. Storage tank 5 is used to store gas, recycle gas, and save energy.

[0039] The pressure stabilizer 7 is located inside the storage tank 5 and is used to change the gas collection space inside the storage tank 5 in order to control the gas stability inside the shaft seal heater 1, prevent damage to the shaft fan 2, and avoid damage to the shaft fan 2 when the bypass pipe 3 is used frequently for pressure relief.

[0040] The first solenoid valve 4 is located inside the bypass pipe 3. The first solenoid valve 4 is equipped with a differential pressure detection unit to detect the internal pressure difference between the storage tank 5 and the shaft seal heater 1. The first solenoid valve 4 controls the opening and closing of the bypass pipe 3 according to the pressure difference to control the connection between the storage tank 5 and the shaft seal heater 1.

[0041] In a specific embodiment, a pressure detector 77 is provided inside each storage tank 5. The pressure detector 77 is used to detect the pressure inside the storage tank 5.

[0042] like Figure 2 and Figure 3 As shown, in one embodiment, a cover plate 6 is fixedly installed on the top of the storage tank 5. The cover plate 6 is used to support the pressure stabilizing component 7. The cover plate 6 is installed on the top of the storage tank 5 by bolts. The cover plate 6 is removed for maintenance of the pressure stabilizing component 7. The pressure stabilizing component 7 includes an electric push rod 71 located in the middle of the cover plate 6.

[0043] The telescopic end of the electric push rod 71 is fixedly mounted with a disc 72, and the pressure stabilizing component 7 also includes a spring 74 fixedly mounted at the bottom of the disc 72, and the other end of the spring 74 is fixedly mounted with a movable disc 75.

[0044] In use, the electric push rod 71 drives the disc 72, spring 74 and movable disc 75 to move up and down inside the storage tank 5 to control the volume of the storage tank 5 and collect and recycle the gas.

[0045] like Figure 2 and Figure 4 As shown in the specific embodiment, a first sealing ring 73 is fixedly installed on the outer wall of the disc 72. The first sealing ring 73 is used to seal and slide the disc 72 and the storage tank 5 to prevent gas from leaking onto the disc 72 and the storage tank 5.

[0046] A second sealing ring 76 is fixedly installed on the outer wall of the movable plate 75. The second sealing ring 76 is used to seal the sliding of the movable plate and the storage tank 5 to prevent gas from leaking on the movable plate and the storage tank 5.

[0047] During use, the gas inside the storage tank 5 compresses the movable disc 75, and the movable disc 75 pressurizes the spring 74 on the disc 75, automatically controlling the internal volume of the storage tank 5 to prevent direct discharge through the bypass pipe 3 multiple times, avoids excessively reducing the gas pressure inside the shaft seal heater 1, and prevents damage to the shaft seal blower 2.

[0048] like Figure 2 As shown, in one embodiment, a water level detector is fixedly installed inside the storage tank 5;

[0049] A control box is fixedly installed on the outside of the storage tank 5. A controller is installed inside the control box, and a processor is fixedly installed inside the control box. The controller and the processor are electrically connected.

[0050] The control box is electrically connected to the pressure difference detection unit, the pressure detector 77, and the first solenoid valve 4.

[0051] The pressure detector is used to detect the air pressure inside the storage tank 5. The air pressure inside the storage tank 5 is compared with the air pressure inside the shaft seal heater 1 and processed to collect, reuse or discharge the air pressure inside the storage tank 5.

[0052] like Figure 2 As shown in the specific embodiment, an exhaust pipe 8 is fixedly provided on the outer wall of the storage tank 5 and below the bypass pipe 3, and a second electrically controlled valve is provided inside the exhaust pipe 8;

[0053] The control box is electrically connected to the second electric control valve.

[0054] When the pressure inside the storage tank 5 is detected as too high by the pressure detector 77, the processor is electrically connected to the second solenoid valve to control the opening and closing of the second solenoid valve, so as to discharge the gas inside the storage tank 5 and reduce the pressure inside the storage tank 5.

[0055] like Figure 2 As shown, in one embodiment, a drain pipe 9 is provided on the outer wall of the storage tank 5 and below the exhaust pipe 8, and a third electrically controlled valve is provided inside the drain pipe 9;

[0056] The control box is electrically connected to the third electric control valve.

[0057] The controller inside the control box is electrically connected to the third solenoid valve, and the processor is electrically connected to the third solenoid valve to control the opening and closing of the third solenoid valve to discharge the liquid inside the storage tank 5.

[0058] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0059] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0060] Additionally, "multiple" refers to two or more.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bypass exhaust device for a heater pipeline, comprising a shaft seal heater (1), a shaft seal fan (2) disposed at the end of the shaft seal heater (1), and a bypass pipe (3) disposed on the shaft seal heater (1), characterized in that: Storage tank (5) is located at the end of bypass pipe (3) to collect the gas inside shaft seal heater (1) and to maintain the pressure balance inside shaft seal heater (1). A pressure stabilizer (7) is installed inside the storage tank (5) to change the gas storage space inside the storage tank (5) in order to control the gas stability inside the shaft seal heater (1) and prevent damage to the shaft seal fan (2). The first solenoid valve (4) is located inside the bypass pipe (3). The first solenoid valve (4) is equipped with a differential pressure detection unit to detect the internal pressure difference between the storage tank (5) and the shaft seal heater (1). The first solenoid valve (4) controls the opening and closing of the bypass pipe (3) according to the pressure difference to control the connection between the storage tank (5) and the shaft seal heater (1).

2. The heater pipeline bypass venting device according to claim 1, characterized in that: Each of the storage tanks (5) is equipped with a pressure detector (77) to detect the pressure inside the storage tank (5).

3. The heater pipeline bypass venting device according to claim 1, characterized in that: The top of the storage tank (5) is fixedly installed with a cover plate (6), and the pressure stabilizing component (7) includes an electric push rod (71) located in the middle of the cover plate (6); The telescopic end of the electric push rod (71) is fixedly mounted with a disc (72), and the pressure stabilizing component (7) also includes a spring (74) fixedly disposed at the bottom of the disc (72), and the other end of the spring (74) is fixedly provided with a movable disc (75).

4. The heater pipeline bypass venting device according to claim 3, characterized in that: A first sealing ring (73) is fixedly installed on the outer wall of the disk (72); A second sealing ring (76) is fixedly installed on the outer wall of the movable disc (75).

5. The heater pipeline bypass venting device according to claim 2, characterized in that: A water level detector is fixedly installed inside the storage tank (5); The storage tank (5) is fixedly provided with a control box on the outside, and a controller is provided inside the control box. A processor is fixedly provided inside the control box. The control box is electrically connected to the differential pressure detection unit, the control box is electrically connected to the pressure detector (77), and the control box is electrically connected to the first solenoid valve (4).

6. The heater pipeline bypass venting device according to claim 5, characterized in that: An exhaust pipe (8) is fixedly provided on the outer wall of the storage tank (5) and below the bypass pipe (3), and a second electrically controlled valve is provided inside the exhaust pipe (8); The control box is electrically connected to the second solenoid valve.

7. The heater pipeline bypass venting device according to claim 6, characterized in that: The storage tank (5) has a drain pipe (9) on its outer wall and below the exhaust pipe (8), and a third electrically controlled valve is provided inside the drain pipe (9); The control box is electrically connected to the third solenoid valve.

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