CN211717716U - 660MW thermal power generating unit drain valve leakage monitoring system - Google Patents
660MW thermal power generating unit drain valve leakage monitoring system Download PDFInfo
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- CN211717716U CN211717716U CN202020623172.5U CN202020623172U CN211717716U CN 211717716 U CN211717716 U CN 211717716U CN 202020623172 U CN202020623172 U CN 202020623172U CN 211717716 U CN211717716 U CN 211717716U
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Abstract
The utility model discloses a 660MW thermal power generating unit drain valve leakage monitoring system belongs to the interior hourglass detection technology field of steam trap. The utility model discloses a wireless temperature transmitter, wireless temperature measurement host computer, signal conversion module and DCS system control room. Wireless temperature transmitter install and gather temperature information on the monitoring point of drain valve both sides, wireless temperature measurement host computer is installed in changer radio signal coverage, and is close to unit DCS system control room, receives the temperature information of gathering and shows through wireless mode, through the signal conversion module of installing in the engineer station of DCS system control room, the temperature information that will monitor spreads into DCS control system and shows. The utility model discloses need not at hydrophobic pipeline field wiring and reform transform the pipeline, the monitoring cost is not high, and can monitor comprehensively according to the nimble wireless temperature transmitter of installation of actual need, and real-time temperature information is mastered to the wireless temperature measurement host computer of staff's accessible and DCS control system, in time overhauls.
Description
Technical Field
The utility model relates to a leak in the steam trap and detect technical field, more specifically say, relate to a 660MW thermal power generating unit drain valve leakage monitoring system.
Background
The valve of the drainage system is one of the most commonly used thermal equipment in a thermal power plant, and has the function of removing steam condensate of a steam pipeline, and the problem of internal leakage fault of the steam drainage valve is common due to factors such as high-pressure steam erosion, improper valve closing time, poor quality of the drainage valve and the like. The internal leakage of the valve can not only cause a certain amount of short circuit of steam and discharge without doing work, but also increase the heat load of the condenser, thus leading to the reduction of the vacuum of the exhaust steam of the unit, the increase of the heat consumption of power generation and the reduction of the economy of the unit. After the valve is internally leaked, the high-speed small-flow fluid erodes the valve core for a long time, so that the internal leakage of the valve is continuously increased and cannot be controlled, and meanwhile, the pipe bends and other parts become thinner, and the pipe explosion can be caused in serious conditions, thereby influencing the personal safety and the unit safety.
At present, most domestic thermal power generating units monitor the temperature of pipe walls in front of and behind a valve in a wired mode such as a control cable and a compensation lead by installing a thermal resistor and a thermocouple on a drain pipeline, the installation and maintenance cost is high, and the selection flexibility of the installation position of a measuring point is poor. For a large number of drainage pipelines on site, it is difficult to achieve comprehensive coverage of measuring points, and only daily measurement and analysis can be performed by maintenance personnel through portable equipment, so that the working efficiency is low.
Through search, the Chinese patent number ZL201920728170X, the date of the publication of authority is 1 month and 10 days in 2020, the name of the invention creation is as follows: the novel valve leakage monitoring device comprises a cavity for collecting leakage liquid and a pressure transmitter, wherein a clamping sleeve interface and a hole for releasing the leakage liquid are respectively arranged on two sides of the cavity for collecting the leakage liquid, the clamping sleeve interface is connected at the downstream part of a valve between tested pipelines, and the cavity and the valve are connected in series through the pipelines; the pressure transmitter is arranged at the top of the cavity and connected with a metal extension pipe, the metal extension pipe can be extended into the bottom of the cavity, and high/low level signals of an output signal end of the pressure transmitter are output to associated equipment to finish automatic monitoring. However, in the application, wiring and monitoring are still performed in a wired manner, and the pipeline needs to be changed to a certain extent and the measuring point is fixed, so that the full-coverage application of a place with a large number of hydrophobic pipelines is difficult.
Disclosure of Invention
1. Technical problem to be solved by the utility model
The utility model discloses an in overcoming the place that has a large amount of hydrophobic pipelines to the problem that wired mode installation monitoring devices flexibility is relatively poor, installation and maintenance cost are higher and be difficult to comprehensive monitoring provides a 660MW thermal power generating unit drain valve leakage monitoring system, the utility model discloses can in time detect the thermal power generating unit drain valve condition of leaking, improve unit operation economy, security.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses a 660MW thermal power generating unit drain valve leakage monitoring system, including wireless temperature transmitter, wireless temperature measurement host computer, signal conversion module and DCS system control room, wireless temperature transmitter install at the check point, wireless temperature measurement host computer is installed in wireless temperature transmitter signal coverage, signal conversion module installs in the engineer station of DCS system control room, signal conversion module converts the information of wireless temperature measurement host computer transmission to spread into DCS control system with the temperature information that wireless temperature transmitter monitored.
As the utility model discloses improve still further, wireless temperature transmitter install on the drain pipe of drain valve both sides, drain pipe intercommunication steam conduit.
As the utility model discloses improve still further, drain valve both sides drain line on be provided with the heat preservation, wireless temperature transmitter's probe is installed in this heat preservation.
As the utility model discloses improve still further, drain pipe outer wall measurement station department weld a thermal-arrest piece, perhaps directly use the stainless steel clamp, wireless temperature transmitter's probe is fixed through this thermal-arrest piece or stainless steel clamp.
As the utility model discloses improve still further, wireless temperature transmitter adopt the model TMS500W-T, its built-in lithium subcell.
As the utility model discloses improve still further, wireless temperature measurement host computer set up display screen and alarm device, show each hydrophobic point temperature value and report to the police.
As the utility model discloses improve further, DCS system control room in set up audible-visual alarm unit, carry out audible-visual alarm, and DCS control system shows each hydrophobic point temperature value through the display screen.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:
(1) the utility model discloses a 660MW thermal power generating unit drain valve leakage monitoring system adopts wireless temperature transmitter, arranges the scene outside with temperature information transmission to hydrophobic pipeline through wireless transmission, need not to carry out the field wiring, and needn't reform transform hydrophobic pipeline, can be according to actual need nimble install the changer at the monitoring scene, and the monitoring cost is not high.
(2) The utility model discloses a 660MW thermal power generating unit drain valve leakage monitoring system, wireless temperature measurement host computer are installed at the thermal power generating unit scene, receive and show the temperature information of wireless temperature transmitter transmission, report to the police when the temperature appears unusually, make things convenient for the maintainer scene to patrol and overhaul, and simultaneously, wireless temperature measurement host computer is close to unit DCS system control room, conveniently uploads to DCS control system with data.
(3) The utility model discloses a 660MW thermal power generating unit drain valve leakage monitoring system can show drainage point temperature value and carry out audible-visual alarm through DCS control system, makes operation and maintainer need not to reach the scene and can judge whether the valve has taken place interior hourglass, reduces the daily maintenance work load, and the real-time supervision drain valve leaks the condition, improves security, reliability and the economic nature of unit operation.
(4) The utility model discloses a 660MW thermal power generating unit trap leakage monitoring system sets up thermal-arrest piece or stainless steel clamp on its scene hydrophobic pipeline, still is provided with the heat preservation, installs wireless temperature transmitter's probe in the heat preservation and fixes and the temperature measurement through thermal-arrest piece or stainless steel clamp, makes the monitoring result more accurate.
Drawings
Fig. 1 is a topological diagram of a leakage monitoring system for a drain valve of a 660MW thermal power generating unit of the present invention;
FIG. 2 is a schematic diagram of the detection point selection of the wireless temperature transmitter of the present invention;
FIG. 3 is a schematic view of the installation of the wireless temperature transmitter of the present invention;
FIG. 4 is a schematic structural diagram of the wireless temperature transmitter of the present invention;
fig. 5 is a schematic diagram of the heat transfer process of the present invention.
The reference numerals in the schematic drawings illustrate:
1. a wireless temperature transmitter; 2. a wireless temperature measurement host; 3. a signal conversion module; 4. a DCS system control room; 5. a steam line; 6. a drain pipe; 7. a drain valve; 8. a heat collection block; 9. a heat-insulating layer; 10. steam; 11. air.
Detailed Description
For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
Combine fig. 1, the utility model discloses a 660MW thermal power generating unit drain valve leakage monitoring system, including wireless temperature transmitter 1, wireless temperature measurement host computer 2, signal conversion module 3 and DCS system control room 4, the temperature of 6 outer walls of wireless temperature transmitter 1 monitoring drain pipe, transmit the temperature information of gathering to wireless temperature measurement host computer 2 through wireless mode, wireless temperature measurement host computer 2 rethread signal conversion module 3 changes temperature information to send the temperature information of wireless temperature transmitter 1 monitoring to thermal power generating unit DCS control system in.
Specifically, with reference to fig. 2 and 3, the drain pipes 6 on both sides of the steam drain valve 7 are selected as temperature measuring points, the drain pipes 6 are communicated with the steam pipe 5, a heat collecting block 8 is welded at the measuring point on the outer wall of the drain pipe 6, a heat insulating layer 9 is arranged outside the drain pipe 6 and the heat collecting block 8, a probe of the wireless temperature transmitter 1 is installed in the heat insulating layer 9, and a temperature measuring probe thereof is fixed on the heat collecting block 8, so that the measured temperature is more accurate, and whether the drain valve 7 leaks or not is conveniently judged. The model TMS500W-T is selected as the wireless temperature transmitter 1, the wireless temperature transmitter is a thermocouple measurement principle, temperature thermoelectric force is converted through the wireless temperature transmitter 1, and data are sent to the wireless temperature measurement host 2 by adopting a Wavemesh wireless ad hoc network protocol; referring to fig. 4, the wireless temperature transmitter 1 is built in a lithium sub-battery without external power supply. Due to the characteristics of wireless transmission and autonomous power supply, the problem of field wiring does not need to be considered when the temperature measuring point is set, the wireless temperature transmitter 1 can be flexibly installed on a monitoring field according to actual needs, the drain pipeline 6 does not need to be modified, and the wireless temperature transmitter can be conveniently applied to places with a large number of drain pipelines 6.
Wireless temperature measurement host computer 2 install in 1 wireless signal coverage of wireless temperature transmitter, and be close to unit DCS system control room 4, conveniently upload to the DCS control system of DCS system control room 4 with data, signal conversion module 3 installs in the engineer station of DCS system control room 4.
Wherein, the signal adopts wireless transmission (wireless ad hoc network technique) between wireless temperature transmitter 1 and the wireless temperature measurement host computer 2, and wireless temperature measurement host computer 2 has a display screen and alarm device, can show each drainage point temperature value at the scene to report to the police when the temperature is unusual, make things convenient for maintainer on-the-spot to patrol and overhaul. The signal adopts digital communication (Modbus communication protocol) between wireless temperature measurement host computer 2 and the signal conversion module 3, DCS control system passes through signal conversion module 2 and receives temperature information, and be provided with display screen and audible-visual alarm unit in the DCS system control room 4, show hydrophobic point temperature value and carry out audible-visual alarm when the temperature risees unusually through monitoring the picture, make operation and maintainer need not to arrive the scene and can judge whether interior hourglass has taken place for drain valve 7, reduce the daily maintenance work load, be convenient for real-time supervision drain valve 7's the leakage condition, improve the security of unit operation, reliability and economic nature.
It is worth mentioning that the present embodiment relies on the principle shown in fig. 5, i.e. the steam flow and heat transfer in the steam pipe 5. Wherein t is the temperature of the steam 10, t1, t2 and t3 are the temperatures of the inner wall, the outer wall and the outer wall of the insulating layer 9 of the hydrophobic pipeline 6 respectively, and ta is the ambient temperature. When the drain valve 7 leaks, steam 10 with temperature higher than ambient temperature flows in the drain pipeline 6, and the steam 10 in the drain pipeline 6 conducts heat outwards through the drain pipeline 6 and the heat preservation layer 9. If the internal leakage is not changed, the heat transfer tends to be stable, and the heat emitted by the drain pipe 6 and the temperatures of the inner wall and the outer wall of the drain pipe are kept constant. (two conditions are distinguished, the first condition is that the on-site drain pipe 6 is short, the drain pipe 6 between the drain valve 7 and the steam pipe 5 is short, the heat loss of a medium in the steam pipe 5 is small before the medium is conducted to the drain valve 7, if the drain valve 7 leaks internally, the medium flows through the drain pipe 6, the temperature of the front part of the drain valve 7 is not greatly changed compared with the temperature of the steam pipe 5, if the drain valve 7 does not leak internally, the temperature of the medium in the drain pipe 6 is gradually reduced to a certain value (commonly called 'dead water'). the second condition is that the drain pipe 6 between the on-site drain valve 7 and the steam pipe 5 is long, the heat loss of the medium in the steam pipe 5 is large before the medium is conducted to the drain valve 7, if the drain valve 7 leaks internally, the medium flows through the drain pipe 6, the temperature of the front part of the drain valve 7 is deviated from the temperature of the steam pipe 5, and if the drain valve 7 does not, then a different temperature deviation occurs and the deviation value is monitored by the wireless temperature transmitter 1. ) According to the relation between the temperature of the front and rear pipe walls of the drain valve 7 and the inner leakage grade, the inner leakage fault can be quantitatively diagnosed by measuring the temperature of the pipe wall near the drain valve 7.
Example 2
The utility model discloses a 660MW thermal power generating unit trap leakage monitoring system, basically with embodiment 1, its difference lies in, 6 outer wall survey points of hydrophobic pipeline no longer weld thermal-arrest piece 8, but directly use the stainless steel clamp, simple and convenient.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a 660MW thermal power generating unit trap leakage monitoring system which characterized in that: including wireless temperature transmitter (1), wireless temperature measurement host computer (2), signal conversion module (3) and DCS system control room (4), wireless temperature transmitter (1) install at the check point, install in wireless temperature transmitter (1) signal coverage in wireless temperature measurement host computer (2), install in the engineer station of DCS system control room (4) signal conversion module (3), signal conversion module (3) convert the information of wireless temperature measurement host computer (2) transmission to transmit into DCS control system with the temperature information of wireless temperature transmitter (1) monitoring.
2. The 660MW thermal power generating unit drain valve leakage monitoring system of claim 1, characterized in that: the wireless temperature transmitter (1) is arranged on the drain pipes (6) at two sides of the drain valve (7), and the drain pipes (6) are communicated with the steam pipe (5).
3. The 660MW thermal power generating unit drain valve leakage monitoring system of claim 2, characterized in that: the heat-insulating layer (9) is arranged on the drain pipelines (6) on the two sides of the drain valve (7), and the probe of the wireless temperature transmitter (1) is installed in the heat-insulating layer (9).
4. The 660MW thermal power generating unit drain valve leakage monitoring system of claim 3, characterized in that: a heat collection block (8) is welded at a measuring point of the outer wall of the drainage pipeline (6), or a stainless steel hoop is directly used, and a probe of the wireless temperature transmitter (1) is fixed through the heat collection block (8) or the stainless steel hoop.
5. The 660MW thermal power generating unit drain valve leakage monitoring system of claim 4, characterized in that: the wireless temperature transmitter (1) adopts the model TMS500W-T, and a lithium subcell is arranged in the wireless temperature transmitter.
6. The 660MW thermal power generating unit drain valve leakage monitoring system of claim 5, characterized in that: the wireless temperature measurement host (2) is provided with a display screen and an alarm device, displays the temperature value of each drainage point and gives an alarm.
7. The 660MW thermal power generating unit drain valve leakage monitoring system of claim 5, characterized in that: and an acousto-optic alarm unit is arranged in the DCS control room (4) to carry out acousto-optic alarm, and the DCS control system displays the temperature value of each hydrophobic point through a display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020623172.5U CN211717716U (en) | 2020-04-21 | 2020-04-21 | 660MW thermal power generating unit drain valve leakage monitoring system |
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| CN202020623172.5U CN211717716U (en) | 2020-04-21 | 2020-04-21 | 660MW thermal power generating unit drain valve leakage monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924115A (en) * | 2021-03-16 | 2021-06-08 | 中电华创(苏州)电力技术研究有限公司 | Device and method for monitoring internal leakage of high-temperature and high-pressure pipeline valve |
| CN113324700A (en) * | 2021-05-10 | 2021-08-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Leakage fault detection system and method for drain valve |
| CN114061835A (en) * | 2021-10-22 | 2022-02-18 | 中核核电运行管理有限公司 | Nuclear power station nuclear island valve leakage monitoring system and method |
-
2020
- 2020-04-21 CN CN202020623172.5U patent/CN211717716U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924115A (en) * | 2021-03-16 | 2021-06-08 | 中电华创(苏州)电力技术研究有限公司 | Device and method for monitoring internal leakage of high-temperature and high-pressure pipeline valve |
| CN113324700A (en) * | 2021-05-10 | 2021-08-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Leakage fault detection system and method for drain valve |
| CN114061835A (en) * | 2021-10-22 | 2022-02-18 | 中核核电运行管理有限公司 | Nuclear power station nuclear island valve leakage monitoring system and method |
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