CN210863063U - Online leakage detection device for heat exchange tube - Google Patents
Online leakage detection device for heat exchange tube Download PDFInfo
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- CN210863063U CN210863063U CN201921656211.5U CN201921656211U CN210863063U CN 210863063 U CN210863063 U CN 210863063U CN 201921656211 U CN201921656211 U CN 201921656211U CN 210863063 U CN210863063 U CN 210863063U
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- exchange tube
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Abstract
The utility model discloses an online leak hunting device of heat exchange tube, including heat exchanger, host computer, alarm, humidity transducer and signal amplifier. The heat exchanger comprises a shell and a heat pipe, wherein an installation space is arranged in the shell, and the heat pipe is fixedly arranged in the installation space of the shell. The shell is also provided with a plurality of mounting holes penetrating through the inside and the outside of the mounting space, the mounting holes are arranged at intervals along the axial direction of the shell, and each mounting hole is provided with the humidity sensor; the signal amplifier is connected with the humidity sensor, the host is connected with the signal amplifier to obtain a real-time humidity value, the host sets a humidity alarm threshold and judges whether an alarm instruction is generated or not according to the real-time humidity value and the humidity alarm threshold, and if the alarm instruction is generated, the alarm instruction is transmitted to the alarm to enable the alarm to send an alarm signal. It has the following advantages: and the leakage detection is carried out through the humidity signal, so that whether the heat pipe leaks or not can be judged in time, and maintenance personnel are reminded to take corresponding measures in time when the heat pipe leaks.
Description
Technical Field
The utility model relates to a power generation technical field generates heat, especially relates to an online leak hunting device of heat exchange tube.
Background
The heat exchange pipe is an important part of the low-temperature electric dust remover for utilizing waste heat, is generally arranged from an outlet of a boiler air preheater to a flue of the electric dust remover or at a horn position of an inlet of the electric dust remover, and a heat exchange medium is medium-low pressure water and is used for absorbing the waste heat of the flue gas at the tail part of the boiler. Because the heat exchange tube wraps up in loudspeaker or flue completely, heat transfer device need maintain a very low state at the inside humidity of during operation, damage on the heat exchange tube can lead to the water leakage in the water pipe, can obviously change the inside humidity of heat transfer device, if leak, not only influence the equipment operation, the water of leaking when more serious can flow into other electrical equipment, like electrostatic precipitator, will cause the interior deposition caking of electrostatic precipitator ash bucket, ash bucket stifled ash, ash conveying system is defeated grey unsmooth, and then threatens electrostatic precipitator safety. In order to solve the technical problems, the Chinese patent database discloses: 1. The invention of CN102967420A discloses an on-line leak detection device for heat exchange tube, which is used to predict whether a leak will occur by detecting the abnormal sound of intensity and frequency generated during the leak; 2. CN100529706B, a device for online detection and leakage prevention of leakage points of tubular heat exchangers, which uses pressure difference to detect whether leakage occurs; 3. CN104949806A, a leakage detection device for waste heat recovery heat exchanger, which uses current method to detect whether leakage occurs; the above solution is complicated in equipment, and the predicted result lacks reliable data to confirm whether the heat pipe has leakage in the near future.
SUMMERY OF THE UTILITY MODEL
The utility model provides an online leak hunting device of heat exchange tube, it has overcome the not enough that heat exchange tube leak hunting device exists among the background art.
The utility model provides one of the technical scheme who adopts of its technical problem is:
the online leakage detection device for the heat exchange tube comprises a heat exchanger, a host and an alarm, wherein the heat exchanger comprises a shell and the heat tube, an installation space is arranged in the shell, the heat tube is fixedly installed in the installation space of the shell, and the host is connected with the alarm; the device also comprises a humidity sensor and a signal amplifier; the shell is also provided with a plurality of mounting holes penetrating through the inside and the outside of the mounting space, the mounting holes are arranged at intervals along the axial direction of the shell, and the humidity sensor is mounted on each mounting hole; the signal amplifier is connected with the humidity sensor, the host is connected with the signal amplifier to obtain a real-time humidity value, the host sets a humidity alarm threshold and judges whether an alarm instruction is generated or not according to the real-time humidity value and the humidity alarm threshold, and if the alarm instruction is generated, the alarm instruction is transmitted to the alarm to enable the alarm to send an alarm signal.
In one embodiment: the plurality of mounting holes are evenly arranged along the axial direction of the shell at intervals.
In one embodiment: the heat pipe is located on the central axis of the heat exchanger.
In one embodiment: the humidity sensor is arranged in the mounting hole of the shell and fixed in the heat exchanger.
In one embodiment: the main machine is connected with the display to display the humidity of different parts in the heat exchanger in real time.
In one embodiment: the distance between every two adjacent mounting holes in the plurality of mounting holes is 0.5 to 2 m.
In one embodiment: each of the moisture sensors is associated with an alarm device as described above.
Compared with the background technology, the technical scheme has the following advantages:
and the leakage detection is carried out through the humidity signal, so that whether the heat pipe leaks or not can be judged in time, and maintenance personnel are reminded to take corresponding measures in time when the heat pipe leaks.
Judging whether the difference between the real-time humidity values of two adjacent numbered humidity sensors along the flowing direction of the high-temperature gas of the heat exchanger is greater than a humidity alarm threshold value or not, judging the leakage position of the heat pipe according to the sudden humidity change position sensed by the humidity sensors, and timely finding and accurately judging the leakage position and the leakage degree of the heat pipe to remind maintenance personnel to take corresponding measures; the device has simple structure and low cost, can find and position leakage points at the initial stage of leakage of the heat pipe, not only avoids the electrical equipment from being damaged due to leakage of the heat pipe, but also fully utilizes the residual service life of the heat exchanger and saves the equipment cost.
Drawings
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
FIG. 1 is a schematic structural diagram of an online leak detection device for a heat exchange tube of an embodiment;
fig. 2 is a front view of a sensor mounting structure of an online leak detection apparatus for a heat exchange tube according to an embodiment.
Fig. 3 is a top view of a sensor mounting structure of an in-line leak detection apparatus with an embodiment of a heat exchange tube.
Detailed Description
Referring to fig. 1 to 3, an online leak detection device for a heat exchange tube includes a heat exchanger 1, a humidity sensor 2, a signal amplifier 3, a host 4, a display 5, and an alarm 6.
The heat exchanger 1 comprises a shell 1.2 and a heat pipe 1.1, wherein an installation space and a plurality of installation holes penetrating through the inside and the outside of the installation space are arranged in the shell 1.2, the installation holes are uniformly arranged at intervals along the axial direction of the shell 1.2, and the distance between every two adjacent installation holes is 0.5-2 m; the heat pipe 1.1 is arranged in the shell 1.2 and is arranged along the central axis of the heat exchanger 1; and each mounting hole is provided with a humidity sensor 2, and the humidity sensors 2 are arranged in the mounting holes of the shell of the heat exchanger 1 and fixed in the heat exchanger 1.
The signal amplifier 3 is connected with the humidity sensor 2 through a lead and is used for amplifying signals of the sensor 2; the host 4 is connected with the signal amplifier 3 through a lead to obtain a real-time humidity value, the display 5 is connected with the host 4 to display the humidity of different parts in the heat exchanger 1 in real time, the host 4 sets a humidity alarm threshold value and judges whether an alarm instruction is generated or not according to the real-time humidity value and the humidity alarm threshold value and sends the alarm instruction to the alarm 6, wherein the host 4 can judge if a counter is directly adopted, and the host 4 can adopt a PLC control system if the counter is directly adopted. The alarm 6 is connected with the host 4 to send out an alarm signal when receiving an alarm instruction, and the signal sent by the alarm is an acoustic signal and an optical signal, such as buzzing sound and light flashing.
During operation, dry high temperature gas in the heat exchanger 1 flows into the intake pipe, if the heat pipe does not leak, its water is less and can volatilize fast, if the heat pipe leaks, the initial leakage makes dry gaseous humidity increase, be sensed by humidity transducer 2, humidity transducer 2's signal of telecommunication is enlarged through signal amplifier 3 and is transmitted to host computer 4, and show different humidity transducer 2's humidity value on display 5, if along high temperature gas flow direction, humidity from certain position forward is greater than certain settlement threshold value than humidity behind, then host computer 4 judges that the heat pipe leakage appears between these two positions, and produce alarm command, alarm command is received in order to send out the police dispatch newspaper to the alarm.
The online leak detection method of the online leak detection device for the heat exchange tube is characterized by comprising the following steps: the method comprises the following steps:
step 31, acquiring a real-time humidity signal and generating a real-time humidity value by a host;
and 32, judging whether the difference between the real-time humidity values of two adjacent serial number humidity sensors along the flowing direction of the high-temperature gas of the heat exchanger is greater than a humidity alarm threshold value, if so, generating an alarm instruction, if the two adjacent serial number are i and i-1, judging that the area between the two humidity alarm threshold values with the serial numbers i and i-1 leaks, transmitting the alarm instruction to an alarm corresponding to the serial number i or/and the serial number i-1, and sending an alarm signal by the alarm.
In order to verify the leak detection effect and the influence factors on the leak detection effect of the embodiment, the following data is that a control variable method is adopted, the position of a leak point is judged according to the numerical fluctuation of 4 instruments, a preset humidity change threshold value is set to be 0.5%, meanwhile, the position of the leak point is set between 3 and 4, and an air inlet is arranged at 4.
Influence of air temperature on leak detection effect, as shown in table one:
(II) influence of water temperature on leak detection effect, as shown in table II:
(III) influence of water pressure on leak detection effect, as shown in Table III:
(IV) the influence of the position of the humidity sensor on the leak detection effect is shown in a table IV:
and (4) experimental conclusion:
from table one, it can be seen that: the higher the air temperature, the longer the time to reach the humidity change threshold.
From table two, it can be seen that: the higher the water temperature, but the shorter the time to reach the humidity change threshold. The reason for this is analyzed to be that the higher the water temperature, the faster the water evaporates, and the faster the humidity changes.
From the table three, it can be seen that: the greater the water pressure, the less the initial humidity is affected, but the shorter the humidity change threshold time is reached. The reason for this analysis is that the higher the water pressure is, the higher the leak flow rate is, and the faster the humidity change occurs at the damaged portion.
From the table four, it can be seen that: the humidity sensor is positioned on the upper part of the heat exchanger, and has slightly better effect than the middle part and obviously better effect than the bottom part. The reason for analyzing the heat exchanger is that the temperature is high in the heat exchanger, and a large amount of moisture exists in a gas form and rises to the upper middle part of the heat exchanger.
Comparing 4 tables, the air temperature and the water pressure have great influence on the time when the instrument reaches the preset fluctuation value. The water temperature and humidity sensor positions have little effect on the time for the instrument to reach the preset fluctuation value.
Therefore, in a controllable range, the smoke temperature of the environment where the heat exchange tube is located should be as small as possible, the water pressure of the heat exchange tube should be as large as possible, and the positions of the water temperature and the humidity sensor can be reasonably controlled in a most economical and convenient mode. Therefore, the instrument can give an alarm at the first time during detection, and workers can overhaul according to the alarm position, so that the loss is reduced to the minimum.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.
Claims (7)
1. The online leakage detection device for the heat exchange tube comprises a heat exchanger, a host and an alarm, wherein the heat exchanger comprises a shell and the heat tube, an installation space is arranged in the shell, the heat tube is fixedly installed in the installation space of the shell, and the host is connected with the alarm; the method is characterized in that: the device also comprises a humidity sensor and a signal amplifier; the shell is also provided with a plurality of mounting holes penetrating through the inside and the outside of the mounting space, the mounting holes are arranged at intervals along the axial direction of the shell, and the humidity sensor is mounted on each mounting hole; the signal amplifier is connected with the humidity sensor, the host is connected with the signal amplifier to obtain a real-time humidity value, the host sets a humidity alarm threshold and judges whether an alarm instruction is generated or not according to the real-time humidity value and the humidity alarm threshold, and if the alarm instruction is generated, the alarm instruction is transmitted to the alarm to enable the alarm to send an alarm signal.
2. The online leakage detection device for the heat exchange tube of claim 1, characterized in that: the plurality of mounting holes are evenly arranged along the axial direction of the shell at intervals.
3. The online leakage detection device for the heat exchange tube of claim 1, characterized in that: the heat pipe is located on the central axis of the heat exchanger.
4. The online leakage detection device for the heat exchange tube of claim 1, characterized in that: the humidity sensor is arranged in the mounting hole of the shell and fixed in the heat exchanger.
5. The online leakage detection device for the heat exchange tube of claim 1, characterized in that: the main machine is connected with the display to display the humidity of different parts in the heat exchanger in real time.
6. The online leakage detection device for the heat exchange tube of claim 1, characterized in that: the distance between every two adjacent mounting holes in the plurality of mounting holes is 0.5 to 2 m.
7. The online leakage detection device for the heat exchange tube of claim 1, characterized in that: each of the moisture sensors is associated with an alarm device as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921656211.5U CN210863063U (en) | 2019-09-30 | 2019-09-30 | Online leakage detection device for heat exchange tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921656211.5U CN210863063U (en) | 2019-09-30 | 2019-09-30 | Online leakage detection device for heat exchange tube |
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| CN210863063U true CN210863063U (en) | 2020-06-26 |
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| CN201921656211.5U Active CN210863063U (en) | 2019-09-30 | 2019-09-30 | Online leakage detection device for heat exchange tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530579A (en) * | 2019-09-30 | 2019-12-03 | 华侨大学 | The online leakage detection apparatus of heat exchanger tube and its online leak hunting method |
| CN113776736A (en) * | 2021-07-30 | 2021-12-10 | 嘉兴石化有限公司 | Equipment leak detection system |
-
2019
- 2019-09-30 CN CN201921656211.5U patent/CN210863063U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530579A (en) * | 2019-09-30 | 2019-12-03 | 华侨大学 | The online leakage detection apparatus of heat exchanger tube and its online leak hunting method |
| CN113776736A (en) * | 2021-07-30 | 2021-12-10 | 嘉兴石化有限公司 | Equipment leak detection system |
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