Drainage inner leakage on-line detection system

Abstract

The utility model relates to a drainage inner leakage on-line detection system, the drainage inner leakage on-line detection system comprises a steam pipeline and a drainage pipeline connected on the steam pipeline, the drainage pipeline is provided with a first valve, one side of the first valve far away from the steam pipeline is provided with a second valve, and the second valve is connected with the steam pipeline. A third valve is arranged on the side, away from the first valve, of the second valve. A drainage header is arranged at the end, away from the second valve, of the third valve. The first thermodetector is arranged on the drainage pipeline between the first valve and the steam pipeline; and the second thermodetector is arranged on the drainage pipeline between the first valve and the second valve. When the drain inner leakage on-line detection system is used, the second valve is isolated by closing the first valve and the third valve, and whether the first valve is completely closed or not is detected by the first thermodetector and the second thermodetector, so that a worker is prevented from being damaged by high-temperature steam sprayed out of the second valve when taking down the second valve; and the safety of workers is further protected.

Description

Technical Field

[0001] The utility model relates to the technical field of drain water discharge systems in power plants, in particular to an online detection system for drain internal leakage. Background Art

[0002] Energy conservation and consumption reduction is a very important task for power plants now and in the future. In the field of steam pipeline draining (regular draining rather than startup draining), when the generator set is operating under load, the normal state of the drain system valve is closed, and the hot standby system drain valve is in a slightly open state to ensure that steam is always flowing; however, as long as the valve is not fully open, the valve core will be flushed. When the hot standby drain valve is fully closed again, the valve will leak internally.

[0003] The conventional layout of the drainage system is as follows: Figure 1 As shown, there is a manual isolation valve and a remote-controlled electric or pneumatic steam trap isolation valve; the normal operation mode is: the manual valve 1 is generally fully open, and the remote control is used for steam trap control. When the remote-controlled steam trap valve 2 is switched on and off after the heating pipe is under pressure, the valve core will be eroded. After the unit is started and stopped several times, the remote-controlled steam trap valve 2 will have internal leakage. When the valve of the conventional steam trap system is replaced, the unit must be shut down for replacement or maintenance, resulting in significant economic losses. Utility Model Content

[0004] The utility model provides an online detection system for internal leakage of a hydrophobic device, so as to solve the technical problem in the prior art that a valve cannot be replaced or detected without stopping operation.

[0005] In order to solve the above problems, the utility model provides an online detection system for hydrophobic internal leakage, which adopts the following technical solutions:

[0006] A drain internal leakage online detection system comprises a steam pipe and a drain pipe connected to the steam pipe, wherein the drain pipe is provided with a first valve, a second valve is provided on the side of the first valve away from the steam pipe, a third valve is provided on the side of the second valve away from the first valve, and a drain manifold is provided on the end of the third valve away from the second valve; the drain pipe is also provided with a first thermometer and a second thermometer, wherein the first thermometer is located between the first valve and the steam pipe; and the second thermometer is located between the first valve and the second valve.

[0007] The beneficial effect is: when the utility model is used, the first valve and the third valve are fully opened, and then the second valve is opened to a slightly open state. Then, when the second valve is damaged and needs to be replaced or maintained, the first valve and the third valve are closed, and then the temperature is measured by the first thermometer and the second thermometer. When the temperature measured by the second thermometer is significantly lower than the temperature measured by the first thermometer, it means that the first valve is completely closed, and the second valve can be replaced at this time. When the utility model is used, the first valve and the third valve are closed to isolate the second valve, and the first thermometer and the second thermometer are used to measure whether the first valve is completely closed, so as to avoid the staff from being hurt by the high-temperature steam sprayed from the second valve when removing the second valve, thereby protecting the safety of the staff.

[0008] Furthermore, a fourth valve is provided between the second valve and the third valve, and a third temperature measuring instrument is provided between the fourth valve and the third valve.

[0009] Beneficial effect: when the second valve needs to be opened from completely closed, the fourth valve is closed first, then the second valve is opened, and finally the fourth valve is opened, so that water first reaches the fourth valve along the second valve. At this time, the drain is basically still to avoid the water flow in the second valve from scouring the second valve, reducing the wear of the valve core of the second valve due to the drain differential pressure; the third thermometer is used to measure the temperature between the fourth valve and the third valve to compare with the data of the first thermometer, so as to ensure that the fourth valve is completely closed.

[0010] Furthermore, a pressure measuring instrument is provided on the drain pipe between the first valve and the steam pipe.

[0011] Beneficial effect: It is convenient to determine the saturated steam temperature value corresponding to the pressure tester, so as to compare it with the temperatures measured by the second thermometer and the first thermometer.

[0012] Furthermore, the second valve is a pneumatic steam trap or an electric steam trap.

[0013] Beneficial effects: It is convenient for workers to remotely control, thereby improving efficiency and preventing steam leakage from harming workers.

[0014] Furthermore, the fourth valve is a pneumatic steam trap or an electric steam trap.

[0015] Beneficial effects: It is convenient for workers to remotely control, thereby improving efficiency and preventing steam leakage from harming workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 It is a conventionally arranged drainage system in the prior art;

[0018] Figure 2 The utility model is a structural schematic diagram of an online detection system for hydrophobic internal leakage.

[0019] Description of reference numerals:

[0020] 1. Manual valve; 2. Isolation valve; 3. Steam pipe; 4. Drain pipe; 5. First valve; 6. Second valve; 7. Third valve; 8. Fourth valve; 9. First thermometer; 10. Second thermometer; 11. Third thermometer; 12. Pressure measuring instrument; 13. Drain header. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0023] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0024] Embodiment 1 of a hydrophobic internal leakage online detection system provided by the utility model:

[0025] like Figure 1As shown, an online detection system for drain internal leakage of the utility model comprises a steam pipe 3 and a drain pipe 4 connected to the steam pipe 3, a first valve 5, a second valve 6, a fourth valve 8 and a third valve 7 are sequentially arranged on the drain pipe 4 from close to the steam pipe 3 to far away from the steam pipe 3, a drain manifold 13 is arranged at one end of the third valve 7 far away from the fourth valve 8, and a first thermometer 9 is arranged on the drain pipe 4 between the first valve 5 and the steam pipe 3, a pressure measuring instrument 12 is arranged between the first thermometer 9 and the first valve 5; a second thermometer 10 is arranged between the first valve 5 and the second valve 6; a third thermometer 11 is arranged between the fourth valve 8 and the third valve 7.

[0026] The first valve 5 and the third valve 7 are manual steam traps, and the second valve 6 and the fourth valve 8 are pneumatic steam traps capable of remote control.

[0027] In this embodiment, the first valve 5, the second valve 6, the fourth valve 8, the third valve 7, the first thermometer 9, the second thermometer 10, the third thermometer 11 and the pressure measuring instrument 12 are all prior art, and their structures and working principles are not described in detail here.

[0028] When the utility model is used, the first valve 5, the second valve 6, the fourth valve 8 and the third valve 7 are fully opened to discharge the drain in the steam pipeline; and when it is necessary to detect whether the drain system has internal leakage, it is only necessary to open the first valve 5 and the third valve 7, and then close the fourth valve 8 and then close the second valve 6. At this time, when the temperature values ​​measured by the first thermometer 9, the second thermometer 10 and the third thermometer 11 are always the same and higher than the corresponding saturation temperature value at the pressure measuring instrument 12, the drain system has internal leakage, and the second valve 6 or the fourth valve 8 needs to be replaced at this time. At this time, the first valve 5 and the third valve 7 are closed again. After closing, when the temperature values ​​displayed by the second thermometer 10 and the third thermometer 11 have a continuous downward trend, it can be considered that the first valve 5 and the third valve 7 are fully closed, and the second valve 6 and the fourth valve 8 can be repaired or replaced at this time.

[0029] When the utility model is used, the first valve and the third valve are closed to isolate the second valve and the fourth valve, and the first, second and third thermometers are used to measure whether the first valve and the third valve are completely closed, so as to avoid the staff from being hurt by the high-temperature steam sprayed from the second valve when taking off the second valve, thereby protecting the staff safety. At the same time, when in use, since the first valve and the third valve are always completely open, the first valve and the third valve are difficult to be damaged, and since the fourth valve is closed first when the second valve is closed, the drain in the second valve can fill the pipeline between the second valve and the fourth valve when the second valve is closed, so that the second valve is flushed by the drain for a short time and the second valve is not easily damaged.

[0030] Embodiment 2 of a hydrophobic internal leakage online detection system provided by the utility model:

[0031] The main difference between it and embodiment 1 is that in embodiment 1, the first valve and the third valve are manual steam traps.

[0032] In this embodiment, the first valve and the third valve are pneumatic steam traps or electric steam traps.

[0033] Embodiment 3 of a hydrophobic internal leakage online detection system provided by the utility model:

[0034] The main difference between it and embodiment 1 is that in embodiment 1, the second valve is a pneumatic steam trap.

[0035] In this embodiment, the second valve is an electric steam trap.

[0036] Embodiment 3 of a hydrophobic internal leakage online detection system provided by the utility model:

[0037] The main difference between it and embodiment 1 is that in embodiment 1, the fourth valve is a pneumatic steam trap.

[0038] In this embodiment, the fourth valve is an electric steam trap.

[0039] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A drain internal leakage online detection system, comprising a steam pipe and a drain pipe connected to the steam pipe, characterized in that: The drain pipe is provided with a first valve, a second valve is provided on the side of the first valve away from the steam pipe, a third valve is provided on the side of the second valve away from the first valve, and a drain manifold is provided on the end of the third valve away from the second valve; the drain pipe is also provided with a first thermometer and a second thermometer, the first thermometer is located between the first valve and the steam pipe; the second thermometer is located between the first valve and the second valve.

2. The hydrophobic internal leakage online detection system according to claim 1 is characterized in that: A fourth valve is provided between the second valve and the third valve, and a third temperature measuring instrument is provided between the fourth valve and the third valve.

3. The hydrophobic internal leakage online detection system according to claim 1, characterized in that: A pressure measuring instrument is also provided on the drain pipe between the first valve and the steam pipe.

4. A hydrophobic internal leakage online detection system according to any one of claims 1 to 3, characterized in that: The first valve and the third valve are manual steam traps.

5. The on-line detection system for hydrophobic internal leakage according to claim 4 is characterized in that: The second valve is a pneumatic steam trap or an electric steam trap.

6. The hydrophobic internal leakage online detection system according to claim 2, characterized in that: The fourth valve is a pneumatic steam trap or an electric steam trap.

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