Multi-stage liquid sealing device capable of automatically supplementing liquid and discharging sewage on line

Abstract

The utility model relates to a multi-stage liquid seal device capable of automatically supplementing liquid and discharging sewage on line, which comprises multiple stages of water seal tanks arranged in parallel and a controller, a communicating pipe is arranged at the upper end between every two adjacent stages of water seal tanks, the upper end of the first-stage water seal tank is provided with a drain inlet, the lower end of the first-stage water seal tank is provided with a water replenishing pipe, and the outer end of the water replenishing pipe is connected with a water replenishing pump. A liquid level meter is arranged on the side surface of the first-stage water-sealed tank, and the liquid level meter and the make-up pump are both in signal connection with the controller; the bottom of each stage of water-sealed tank is provided with a drain outlet, the lower end of each drain outlet is provided with a blow-down tank, the upper end and the lower end of each blow-down tank are respectively provided with a control valve, each control valve is in signal connection with the controller, the bottom end of each blow-down tank is provided with a blow-down pipe, and the blow-down pipes are communicated with all the blow-down tanks; the water level of the observation station and the water seal is detected in real time through the computer, the situation that problems cannot be found in time through manual monitoring is avoided, when the water level of the multi-stage water seal drops, water supplementing operation is controlled by the computer, and meanwhile online pollution discharge can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine auxiliary equipment technical field, concretely is a multistage liquid seal device of automatic liquid supplement and on -line blowdown. BACKGROUND

[0002] Steam turbine condenser vacuum: steam is exhausted after doing work in steam turbine, and enters the condenser in vacuum state, and is condensed into water, and the latent heat released in this process is taken away by cooling water. The rapid condensation of the exhaust steam is crucial for the continuous operation of the steam turbine, as it ensures that the steam turbine can continuously receive new steam for work. The higher the vacuum degree in the condenser, the lower the pressure when the exhaust steam condenses, and the lower the corresponding saturation temperature. This means that the condensation process can be carried out at a lower temperature, thereby reducing the irreversible heat loss in the condensation process. Therefore, improving the vacuum degree of the condenser helps to improve the thermal efficiency of the steam turbine.

[0003] The steam turbine auxiliary equipment shaft seal heater drain is connected to the condenser through a multistage water seal device. The principle of the multistage water seal is that the drain is overflowed step by step, and the steam in the heater is sealed by the water column in the multistage water seal and cannot be discharged. The height of the water column of the water seal depends on the difference between the pressure in the heater and the external pressure. The multistage water seal is the drain part of the steam turbine shaft seal heater. The shaft seal heater is in a micro-negative pressure state when it is running, with a pressure of about -6 kPa. The vacuum pressure difference with the condenser is about 10 m of water column (about 100 KPa). According to the working principle of the multistage water seal, the multistage water seal must generate a resistance higher than 10 m of water column when working to ensure that the drain is smooth and air cannot leak in. In fact, the multistage water seal increases the resistance of the drain, so that the shaft seal heater drain passes through the multistage water seal and then returns to the condenser steam side with a certain height, and the flow resistance plus the pressure difference is just equal to the vacuum of the condenser. In theory, after the multistage water seal is filled with water, the water level will not fluctuate greatly, but in practice, due to abnormal conditions such as drastic changes in working conditions, it is easy to cause the drain to be not smooth (the flow resistance is large) or the flow resistance to be small due to leakage of vacuum. And considering the leakage of vacuum, the multistage water seal blowdown cannot be operated online, and can only be blowdown after shutdown. SUMMARY

[0004] The purpose of the utility model is to solve the problems existing in the prior art, and to provide a multistage liquid seal device with automatic liquid supplement and on-line blowdown.

[0005] The utility model discloses a specific scheme is: a kind of multistage liquid seal device of automatic liquid supplement and on-line pollution discharge, including multistage parallelly arranged water seal tank and controller, the upper end between each adjacent two levels water seal tank is equipped with communicating pipe, the upper end of first level water seal tank is equipped with hydrophobic inlet, and the lower end is equipped with water replenishing pipe, the outer end of water replenishing pipe is connected with water replenishing pump, liquid level meter is mounted to the side of first level water seal tank, and liquid level meter and water replenishing pump are all signal connected to the controller;The bottom of each level water seal tank is equipped with pollution discharge outlet, and the lower end of each pollution discharge outlet is equipped with pollution discharge tank, and the upper end and the lower end of each pollution discharge tank are equipped with one control valve respectively, and each control valve is signal connected with controller, and the bottom end of pollution discharge tank is equipped with one pollution discharge pipe, and pollution discharge pipe is communicated with all pollution discharge tanks.

[0006] Further, the inner end of hydrophobic inlet is equipped with coil pipe extending to the bottom of water seal tank, and each level water seal tank is equipped with downwardly extending spiral coil pipe at communicating pipe.

[0007] Further, the top of each level water seal tank is equipped with exhaust valve, and exhaust valve adopts one-way valve, and only allows water seal tank internal gas to discharge outward.

[0008] Further, the liquid level meter adopts magnetic flap liquid level meter.

[0009] Compared with prior art, the utility model has the following advantages: solve the problem of when multistage water seal water level fluctuation influence vacuum;By computer real-time detection observation and water seal water level, avoid the situation that human monitoring disc cannot find problem in time, when multistage water seal water level drops, and water replenishing operation is controlled by computer, and on-line pollution discharge can be realized simultaneously;Reduce the input of artificial, and the device is simple in design, reduce installation difficulty, and maintenance cost in later period. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structure schematic diagram of the utility model;

[0011] In the drawing: 1, water seal tank;2, spiral coil pipe;3, pollution discharge tank;4, water replenishing pipe;5, pollution discharge pipe;6, control valve;7, magnetic flap liquid level meter;8, hydrophobic inlet;9, exhaust valve;10, communicating pipe. DETAILED DESCRIPTION

[0012] See Figure 1The embodiment is a multi-stage liquid seal device with automatic liquid supplement and online pollution discharge, comprising multi-stage parallelly arranged water seal tanks 1 and a controller, a communicating pipe 10 is arranged at the upper end between every two adjacent water seal tanks 1, a drain inlet 8 is arranged at the upper end of the first water seal tank 1, a water supplement pipe 4 is arranged at the lower end of the first water seal tank 1, the outer end of the water supplement pipe 4 is connected with a water supplement pump, a liquid level meter is arranged on the side of the first water seal tank 1, and the liquid level meter and the water supplement pump are signal connected to the controller; a pollution discharge port is arranged at the bottom of each water seal tank 1, a pollution discharge tank 3 is arranged at the lower end of each pollution discharge port, a control valve 6 is arranged at the upper end and the lower end of each pollution discharge tank 3, each control valve 6 is signal connected to the controller, and a pollution discharge pipe 5 is arranged at the bottom end of the pollution discharge tank 3 and communicates with all the pollution discharge tanks 3.

[0013] Further, the inner end of the drain inlet 8 is provided with a coil pipe extending to the bottom of the water seal tank 1, and a spiral coil pipe 2 extending downward is arranged at the communicating pipe 10 of each water seal tank 1, so that the heat exchange effect is enhanced by arranging the spiral coil pipe 2.

[0014] Further, the top end of each water seal tank 1 is provided with an exhaust valve 9, the exhaust valve 9 is a one-way valve, and only allows the gas in the water seal tank 1 to be discharged outward.

[0015] Further, the liquid level meter is a magnetic float liquid level meter 7.

[0016] The working principle of the utility model is as follows: the drain of the shaft seal heater flows into the first water seal tank 1 from the drain inlet 8, and then overflows to the subsequent multi-stage water seal tanks 1 for cooling and discharge; in the process, the multi-stage water seal liquid level is monitored online by the magnetic float liquid level meter 7, when the liquid level is reduced to the set value, the water is automatically supplemented by the controller signal control, and the water supplement pump is automatically closed after the liquid level is restored to normal; meanwhile, the online pollution discharge device is increased, and the control is realized by the upper and lower control valves 6 of the pollution discharge tank 3. When discharging pollution, the controller opens the control valve 6 above the pollution discharge tank 3, closes the control valve 6 below the pollution discharge tank 3, so that the water is discharged into the pollution discharge tank 3, then the control valve 6 above the pollution discharge tank 3 is closed, the control valve 6 below the pollution discharge tank 3 is opened, and the pollution is discharged step by step, so that the online pollution discharge is realized, and the water quality in the water seal tank 1 is controlled.

Claims

1. A multi-stage liquid seal device with automatic liquid replenishment and online sewage discharge, characterized in that: The system includes multiple water seal tanks arranged in parallel and a controller. A connecting pipe is provided at the upper end between each pair of adjacent water seal tanks. The upper end of the first-stage water seal tank is provided with a drainage inlet, and the lower end is provided with a water supply pipe. The outer end of the water supply pipe is connected to a water supply pump. A level gauge is installed on the side of the first-stage water seal tank. The level gauge and the water supply pump are both signal-connected to the controller. Each water seal tank has a drain outlet at the bottom. Each drain outlet is connected to a drain tank at the lower end. Each drain tank has a control valve at the upper and lower ends. Each control valve is signal-connected to the controller. A drain pipe is provided at the bottom of the drain tank, and the drain pipe is connected to all drain tanks.

2. The multi-stage liquid seal device for automatic liquid replenishment and online sewage discharge according to claim 1, characterized in that: The inner end of the hydrophobic inlet is provided with a coil extending towards the bottom of the water seal tank, and each stage of the water seal tank is provided with a downward-extending spiral coil at the connecting pipe.

3. The multi-stage liquid seal device for automatic liquid replenishment and online sewage discharge according to claim 1, characterized in that: Each water seal tank is equipped with an exhaust valve at the top. The exhaust valve is a one-way valve, which only allows the gas inside the water seal tank to be discharged to the outside.

4. The multi-stage liquid seal device for automatic liquid replenishment and online sewage discharge according to claim 1, characterized in that: The level gauge is a magnetic float level gauge.

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