CN108844688B - System and method for monitoring leakage of low-temperature heat exchanger - Google Patents
System and method for monitoring leakage of low-temperature heat exchanger Download PDFInfo
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- CN108844688B CN108844688B CN201810664087.0A CN201810664087A CN108844688B CN 108844688 B CN108844688 B CN 108844688B CN 201810664087 A CN201810664087 A CN 201810664087A CN 108844688 B CN108844688 B CN 108844688B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/182—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a system and a method for monitoring leakage of a low-temperature heat exchanger, comprising a thermal resistance temperature acquisition module and a plurality of temperature measuring sleeves, wherein one end of each temperature measuring sleeve is positioned in a heat exchange medium pipeline of the low-temperature heat exchanger, the other end of each temperature measuring sleeve is positioned outside the heat exchange medium pipeline of the low-temperature heat exchanger, a plurality of armored thermal resistance temperature probes are arranged on the outer wall of each temperature measuring sleeve, each armored thermal resistance temperature probe is positioned in the heat exchange medium pipeline of the low-temperature heat exchanger, and each armored thermal resistance temperature probe is connected with the thermal resistance temperature acquisition module through a thermal resistance compensation wire.
Description
Technical Field
The invention belongs to the technical field of leakage monitoring, and relates to a system and a method for monitoring leakage of a low-temperature heat exchanger.
Background
At present, haze weather in large areas of China frequently occurs, and the environment is very severe. The notification of the national development and reform commission, the environmental protection department and the national energy bureau for combined delivery of modified energy [2014]2093 about the "coal-to-electricity energy saving and emission reduction upgrading and modification action plan (2014-2020)" of the national energy bureau clearly proposes that the emission concentration of atmospheric pollutants of a newly built coal-fired power generating unit in the eastern region basically reaches the emission limit value of the gas turbine unit (namely, the emission concentration of smoke, sulfur dioxide and nitrogen oxides is not higher than 10 mg/cubic meter respectively under the condition of the reference oxygen content of 6%), and the newly built unit in the middle region is basically close to or reaches the emission limit value of the gas turbine unit, so that the newly built unit in the western region is encouraged to be close to or reach the emission limit value of the gas turbine unit.
Meanwhile, with the deep development of the national energy conservation and emission reduction work, after the national third agency issues the national energy conservation and emission reduction upgrade and transformation action plan (2014-2020), the national energy bureau issues the spirit of the national energy bureau comprehensive department on decomposing and realizing the task goal of the energy conservation, emission reduction upgrade and transformation of the coal and electricity, and higher requirements are put forward on the energy consumption level of the thermal power unit. By 2020, the average power supply coal consumption after the modification of the active thermal power unit is lower than 310 g/(kW.h), wherein the average power supply coal consumption after the modification of the active 60-kilowatt and above unit (except the air cooling unit) is lower than 300 g/(kW.h).
The low-temperature heat exchanger comprises a low-temperature economizer, a flue gas cooler, a heater, a flue gas reheater and the like, is equipment for exchanging heat between low-temperature condensate water and flue gas or air, and simultaneously adopts a flue gas waste heat utilization technology with the low-temperature heat exchanger as a core to reduce the power generation coal consumption of a unit by 2-4 g/(kW.h), so that the low-temperature heat exchanger is rapidly developed under the great background of ultra-low emission and energy conservation and emission reduction policies.
The low-temperature heat exchanger is a flue gas/air-water heat exchanger which is formed by nearly ten thousand heat exchange tubes, condensed water flows in the heat exchange tubes, and flue gas or air is transversely swept outside the heat exchange tubes to release heat. For a low-temperature economizer or a flue gas cooler arranged at the inlet of the dust remover, leakage phenomenon often occurs due to higher ash content in the flue gas; for the air heater, although clean air flows outside the pipe, leakage phenomenon also exists due to the risk of freezing the pipe in winter; for flue gas reheaters, wet flue gas with very little ash content flows outside the tube, but leakage is also present due to the higher risk of corrosion. Leakage is mainly due to heat exchange tube quality problems or wear, corrosion, freezing. With the continuous improvement of the manufacturing process, leakage caused by the quality problem of the heat exchange tube is less and less, and most of leakage is caused by other reasons. The low-pressure condensate water after leakage is sprayed into the flue gas/air, so that the humidity of the flue gas/air is greatly increased, the follow-up dust remover, the air preheater, the flue and the like are blocked and corroded, the machine set is seriously stopped, and the great hidden danger is brought to the safe and stable operation of a flue gas waste heat utilization system, so that the leakage monitoring of the low-temperature heat exchanger is very important.
The leakage alarm of the traditional low-temperature heat exchanger adopts a hygrometer or an observation method to alarm. The hygrometer alarms after obvious change of the humidity of the flue gas/air after the equipment leaks, but the actual operation shows that the sectional area of the flue gas/air channel is too large, the hygrometer is difficult to consider, the ash content in the flue gas is too large, and the measurement accuracy of the hygrometer is poor. The observation method is that the temperature of the flue gas or the temperature of the air can be obviously changed after leakage occurs or the related monitoring data of the dust remover/air preheater is abnormal, so that the leakage of the low-temperature heat exchanger can be judged, but the method has larger contingency, and can only be monitored by other data when the leakage is serious. Even if leakage occurs, the position of the leakage point cannot be judged in time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a system and a method for monitoring leakage of a cryogenic heat exchanger, which can rapidly detect whether the cryogenic heat exchanger leaks or not and rapidly determine the position of a leakage point after the leakage occurs.
In order to achieve the above purpose, the system for monitoring leakage of the cryogenic heat exchanger comprises a thermal resistance temperature acquisition module and a plurality of temperature measuring sleeves, wherein one end of each temperature measuring sleeve is positioned in a heat exchange medium pipeline of the cryogenic heat exchanger, the other end of each temperature measuring sleeve is positioned outside the heat exchange medium pipeline of the cryogenic heat exchanger, a plurality of armored thermal resistance temperature probes are arranged on the outer wall of each temperature measuring sleeve, each armored thermal resistance temperature probe is positioned in the heat exchange medium pipeline of the cryogenic heat exchanger, and each armored thermal resistance temperature probe is connected with the thermal resistance temperature acquisition module through a thermal resistance compensation wire.
One armored thermal resistance temperature measuring probe corresponds to one thermal resistance compensation wire, wherein one end of the thermal resistance compensation wire is connected with the armored thermal resistance temperature measuring probe, and the other end of the thermal resistance compensation wire passes through a temperature measuring sleeve corresponding to the armored thermal resistance temperature measuring probe and then is connected with the thermal resistance temperature acquisition module.
Each armored thermal resistance temperature measuring probe is positioned on the windward side of the temperature measuring sleeve.
The distance between two adjacent armored thermal resistance temperature measuring probes on the same temperature measuring sleeve is 0.5 meter, and the distance between two adjacent temperature measuring sleeves is 0.5 meter.
The length of each armored thermal resistance temperature measuring probe is 10mm, and the diameter of each temperature measuring sleeve is 20mm.
The temperature measuring sleeve is fixed on the reinforcing rib of the heat exchange medium pipeline of the low-temperature heat exchanger.
The intelligent temperature control system also comprises an upper computer, a display and an alarm, wherein the upper computer is connected with the display, the alarm and the thermal resistance temperature acquisition module.
The method for monitoring leakage of the low-temperature heat exchanger comprises the following steps of:
the thermal resistance temperature acquisition module detects temperature information of different positions of a heat exchange medium pipeline of the low-temperature heat exchanger in real time through each armored thermal resistance temperature measuring probe, and sends the temperature information of different positions of the heat exchange medium pipeline of the low-temperature heat exchanger to the upper computer, the upper computer displays the temperature information of different positions of the heat exchange medium pipeline of the low-temperature heat exchanger through the display, when the variation amplitude of the temperature of any position is greater than or equal to a preset value, the position is indicated to be leaked, and the upper computer gives an alarm through the alarm to remind workers of the position to be leaked.
The invention has the following beneficial effects:
according to the system and the method for monitoring the leakage of the low-temperature heat exchanger, when the low-temperature heat exchanger leaks according to engineering practical experience, the medium temperature in the heat exchange medium pipeline can be obviously changed.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a view showing an installation position of the sheathed thermal resistance temperature measurement probe 4 according to the present invention.
Wherein, 1 is a thermal resistance temperature acquisition module, 2 is a thermal resistance compensation wire, 3 is a temperature measuring sleeve, 4 is an armored thermal resistance temperature measuring probe, 5 is a heat exchange medium pipeline, and 6 is a reinforcing rib.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1 and 2, the system for monitoring leakage of a cryogenic heat exchanger according to the present invention comprises a thermal resistance temperature acquisition module 1 and a plurality of temperature measurement sleeves 3, wherein one end of each temperature measurement sleeve 3 is located in a heat exchange medium pipeline 5 of the cryogenic heat exchanger, the other end of each temperature measurement sleeve 3 is located outside the heat exchange medium pipeline 5 of the cryogenic heat exchanger, a plurality of armored thermal resistance temperature measurement probes 4 are arranged on the outer wall of each temperature measurement sleeve 3, each armored thermal resistance temperature measurement probe 4 is located in the heat exchange medium pipeline 5 of the cryogenic heat exchanger, and each armored thermal resistance temperature measurement probe 4 is connected with the thermal resistance temperature acquisition module 1 through a thermal resistance compensation wire 2.
One armored thermal resistance temperature measuring probe 4 corresponds to one thermal resistance compensation wire 2, wherein one end of the thermal resistance compensation wire 2 is connected with the armored thermal resistance temperature measuring probe 4, and the other end of the thermal resistance compensation wire 2 passes through a temperature measuring sleeve 3 corresponding to the armored thermal resistance temperature measuring probe 4 and then is connected with the thermal resistance temperature acquisition module 1.
Each armored thermal resistance temperature measuring probe 4 is positioned on the windward side of the temperature measuring sleeve 3; the distance between two adjacent armored thermal resistance temperature measuring probes 4 on the same temperature measuring sleeve 3 is 0.5 meter, and the distance between two adjacent temperature measuring sleeves 3 is 0.5 meter; the length of each armored thermal resistance temperature measuring probe 4 is 10mm, and the diameter of each temperature measuring sleeve 3 is 20mm; the temperature measuring sleeve 3 is fixed on the reinforcing rib 6 of the heat exchange medium pipeline 5 of the low-temperature heat exchanger.
The invention also comprises an upper computer, a display and an alarm, wherein the upper computer is connected with the display, the alarm and the thermal resistance temperature acquisition module 1.
According to engineering practical experience, when the low-temperature heat exchanger leaks, the temperature of the medium in the heat exchange medium pipeline 5 can be obviously changed, and when any position leaks, the temperature measured by the armored thermal resistance temperature measuring probe 4 at the position can be obviously changed.
Based on the engineering practical experience, the method for monitoring the leakage of the cryogenic heat exchanger comprises the following steps of:
the thermal resistance temperature acquisition module 1 detects temperature information of different positions of the heat exchange medium pipeline 5 of the low-temperature heat exchanger in real time through each armored thermal resistance temperature measuring probe 4, and sends the temperature information of different positions in the heat exchange medium pipeline 5 of the low-temperature heat exchanger to the upper computer, the upper computer displays the temperature information of different positions in the heat exchange medium pipeline 5 of the low-temperature heat exchanger through the display, when the variation amplitude of the temperature of any position is greater than or equal to a preset value, the position is indicated to be leaked, and the upper computer alarms through the alarm to remind workers of the position leakage.
In addition, it should be noted that the system for monitoring leakage of the cryogenic heat exchanger according to the present invention is arranged in the downstream direction of the cryogenic heat exchanger.
Claims (6)
1. The system for monitoring leakage of the low-temperature heat exchanger is characterized by comprising a thermal resistance temperature acquisition module (1) and a plurality of temperature measuring sleeves (3), wherein one end of each temperature measuring sleeve (3) is positioned in a heat exchange medium pipeline (5) of the low-temperature heat exchanger, the other end of each temperature measuring sleeve (3) is positioned outside the heat exchange medium pipeline (5) of the low-temperature heat exchanger, a plurality of armored thermal resistance temperature measuring probes (4) are arranged on the outer wall of each temperature measuring sleeve (3), each armored thermal resistance temperature measuring probe (4) is positioned in the heat exchange medium pipeline (5) of the low-temperature heat exchanger, and each armored thermal resistance temperature measuring probe (4) is connected with the thermal resistance temperature acquisition module (1) through a thermal resistance compensation wire (2);
one armored thermal resistance temperature measuring probe (4) corresponds to one thermal resistance compensation wire (2), wherein one end of the thermal resistance compensation wire (2) is connected with the armored thermal resistance temperature measuring probe (4), and the other end of the thermal resistance compensation wire (2) passes through a temperature measuring sleeve (3) corresponding to the armored thermal resistance temperature measuring probe (4) and is connected with a thermal resistance temperature acquisition module (1);
each armored thermal resistance temperature measuring probe (4) is positioned on the windward side of the temperature measuring sleeve (3).
2. The system for monitoring leakage of a cryogenic heat exchanger according to claim 1, characterized in that the distance between two adjacent sheathed thermal resistance temperature measurement probes (4) on the same temperature measurement sleeve (3) is 0.5 meter and the distance between two adjacent temperature measurement sleeves (3) is 0.5 meter.
3. The system for monitoring leakage of a cryogenic heat exchanger according to claim 1, characterized in that the length of each armoured thermal resistance temperature measuring probe (4) is 10mm and the diameter of each temperature measuring sleeve (3) is 20mm.
4. System for cryogenic heat exchanger leakage monitoring according to claim 1, characterized in that the temperature measuring sleeve (3) is fixed to the stiffening rib (6) of the cryogenic heat exchanger heat exchange medium conduit (5).
5. The system for monitoring leakage of the cryogenic heat exchanger according to claim 1, further comprising an upper computer, a display and an alarm, wherein the upper computer is connected with the display, the alarm and the thermal resistance temperature acquisition module (1).
6. A method for cryogenic heat exchanger leak monitoring, characterized by the system for cryogenic heat exchanger leak monitoring according to claim 5, comprising the steps of:
the thermal resistance temperature acquisition module (1) detects temperature information of different positions of a heat exchange medium pipeline (5) of the low-temperature heat exchanger in real time through each armored thermal resistance temperature measurement probe (4), and sends the temperature information of different positions in the heat exchange medium pipeline (5) of the low-temperature heat exchanger to the upper computer, the upper computer displays the temperature information of different positions in the heat exchange medium pipeline (5) of the low-temperature heat exchanger through the display, when the variation amplitude of the temperature of any position is greater than or equal to a preset value, the position is indicated to be leaked, and the upper computer gives an alarm through the alarm to remind workers of the position leakage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810664087.0A CN108844688B (en) | 2018-06-25 | 2018-06-25 | System and method for monitoring leakage of low-temperature heat exchanger |
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| CN201810664087.0A CN108844688B (en) | 2018-06-25 | 2018-06-25 | System and method for monitoring leakage of low-temperature heat exchanger |
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| CN108844688B true CN108844688B (en) | 2023-06-13 |
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| CN109682539A (en) * | 2018-11-23 | 2019-04-26 | 国网天津市电力公司电力科学研究院 | The integrated valve leakage current tester of more measuring techniques |
| CN115435619A (en) * | 2022-09-13 | 2022-12-06 | 西安热工研究院有限公司 | Gas-water heat exchanger leakage monitoring system and method |
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