CN111981892B - Method for judging leakage point of surface type steam-water heat exchanger - Google Patents
Method for judging leakage point of surface type steam-water heat exchanger Download PDFInfo
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- CN111981892B CN111981892B CN202010757689.8A CN202010757689A CN111981892B CN 111981892 B CN111981892 B CN 111981892B CN 202010757689 A CN202010757689 A CN 202010757689A CN 111981892 B CN111981892 B CN 111981892B
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- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3227—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators for radiators
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Abstract
The invention discloses a method for judging leakage of a surface type steam-water heat exchanger, which regularly records various indexes of the heat exchanger every day, including liquid level, steam inlet pressure, steam inlet temperature, water inlet pressure, water inlet temperature, water outlet pressure, water outlet temperature, drainage valve opening degree, crisis drainage valve opening degree, and simultaneously records final water supply flow and pump outlet water supply flow; and synchronously calculating the temperature rise of the water side, the upper end difference and the lower end difference, then checking the data recorded in the step, and if the abnormal change of a single index or a plurality of indexes is found, judging whether the heat exchanger leaks or not and judging the leakage point by combining other indexes. The invention can quickly judge that the heat exchanger leaks and roughly determine the leakage point, thereby facilitating the timely response of equipment operators, avoiding the further expansion of the leakage point and providing directional guidance for the next overhaul.
Description
Technical Field
The invention relates to a method for judging a leakage point of a surface type steam-water heat exchanger, belonging to the technical field of thermal power steam turbines and auxiliary systems thereof.
Background
The surface type steam-water heat exchanger is a common heat exchange device, steam and feed water exchange heat through a metal wall surface, the steam and the feed water do not directly contact with each other, the steam is condensed on the shell side of the heat exchanger to release heat, and the feed water absorbs heat on the tube side of the heat exchanger. In the operation process of the surface type steam-water heat exchanger, the leakage problem of the heat exchanger is often caused by a plurality of objective practical factors such as scouring and corrosion of flowing working media, thermal stress damage caused by temperature change of the heat exchanger, quality of maintenance process and the like. After the heat exchanger leaks, the heat exchanger heat exchange efficiency is reduced, if leakage cannot be judged in the first time, leakage points can be enlarged, equipment safety is damaged, and the later-period overhauling difficulty is increased. The problems to be solved at present are: for the running surface type steam-water heat exchanger, how to quickly judge that the heat exchanger leaks and roughly determine a leakage point, so that equipment operators can timely respond conveniently and directional guidance is provided for next-step maintenance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for judging the leakage point of a surface type steam-water heat exchanger, which can quickly judge whether the heat exchanger leaks or approximately leaks, is convenient for equipment operators to stop loss at the first time and protects the equipment safety of the surface type steam-water heat exchanger to the maximum extent.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
a method for judging the leakage point of a surface type steam-water heat exchanger comprises the following steps:
s01), recording various indexes of the surface type steam-water heat exchanger at regular time every day, including the liquid level of the heat exchanger, the steam inlet pressure, the steam inlet temperature, the water inlet pressure, the water inlet temperature, the water outlet pressure, the water outlet temperature, the drainage temperature, the opening of a drainage valve and the opening of a crisis drainage valve, and simultaneously recording the final water supply flow and the pump outlet water supply flow;
s02), synchronously calculating the temperature rise of the water side, the upper end difference and the lower end difference according to the data recorded in the step S01, wherein: the temperature rise of the water side = the water outlet temperature-the water inlet temperature, the upper end difference = the saturation temperature under the steam inlet pressure-the water outlet temperature, and the lower end difference = the drainage temperature-the water inlet temperature;
s03), checking the data recorded in the steps S01 and S02, and if the single index or a plurality of indexes are found to be abnormally changed, judging whether the heat exchanger leaks or not and judging the leakage point by combining other indexes.
Further, the abnormal indexes found in the step S03 are analyzed, and if the liquid level of the heat exchanger suddenly rises, the lower end difference suddenly increases, the opening of the drain trap and the opening of the crisis drain trap are synchronously increased, the water supply flow at the outlet of the pump suddenly increases, but the final water supply flow does not change, it is determined that the heat exchanger leaks, and the leaking point is the damage of the heat exchange tube at the water outlet section or the crack of the welding seam between the tube plate at the end of the water outlet chamber and the heat exchange tube.
Further, the abnormal index in the step S03 is analyzed, if the liquid level of the heat exchanger suddenly rises, the lower end difference suddenly decreases, the opening degree of the drain trap and the opening degree of the crisis drain trap are synchronously increased, the water supply flow at the outlet of the pump suddenly increases, but the final water supply flow does not change, it is determined that the heat exchanger leaks, and the leakage point is the damage of the heat exchange tube at the water inlet section or the crack of the welding seam between the tube plate at the end of the water inlet chamber and the heat exchange tube.
Further, the abnormal index in step S03 is analyzed, and if the temperature rise at the water side suddenly decreases, the upper end difference suddenly increases, and other indexes have no obvious change, it is determined that the heat exchanger has leaked, and the leakage point is a water chamber partition.
Further, the abnormal indexes in the step S03 are analyzed, and if the liquid level of the heat exchanger suddenly fluctuates, the drain temperature suddenly rises, the lower end difference suddenly increases, the obvious vibration of the drain pipeline of the heat exchanger is checked on site, and other indexes have no obvious change, it is determined that the heat exchanger leaks, and the drain cooling section cladding at the leaking position is formed.
Further, the index recorded in steps S01 and S02 has a normal change curve, and if the change of the index is different from the normal change curve, it is an abnormal change.
The invention has the beneficial effects that: according to the invention, the leakage of the heat exchanger can be quickly judged according to the change of the operation index data, the leakage point is roughly determined, the equipment operation personnel can respond in time, the further expansion of the leakage point is avoided, and the directional guidance is provided for the next step of maintenance.
Drawings
FIG. 1 is a schematic view of a leak location of a surface type steam-water heat exchanger;
in the figure: 1. the water outlet section comprises a water outlet section heat exchange tube, 2, a welding line between a water outlet chamber end tube plate and a heat exchange tube, 3, a water outlet chamber, 4, a water chamber partition plate, 5, an end tube plate, 6, a water inlet chamber, 7, a welding line between a water inlet chamber end tube plate and a heat exchange tube, 8, a hydrophobic cooling section cladding, 9 and a water inlet section heat exchange tube.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The embodiment discloses a method for judging a leakage point of a surface type steam-water heat exchanger, which is shown in fig. 1 and is a schematic diagram of the surface type steam-water heat exchanger, and the method comprises a water outlet chamber 3 and a water inlet chamber 6, wherein the water outlet chamber 3 and the water inlet chamber 6 are separated by a water chamber partition plate 4, and a water inlet of a water inlet section heat exchange tube 9 and a water outlet of the water outlet section heat exchange tube 1 are both welded on an end tube plate 5. Among the locations where leaks may occur are: the water cooling system comprises a water inlet section heat exchange tube 9, a water outlet section heat exchange tube 1, a welding seam 2 between a water outlet chamber end tube plate and a heat exchange tube, a water chamber partition plate 4, a welding seam 7 between a water inlet chamber end tube plate and a heat exchange tube, and a hydrophobic cooling section cladding 8.
The method can judge whether the heat exchanger leaks or not and an approximate leakage point, and comprises the following specific implementation steps:
s01), recording various indexes of the surface type steam-water heat exchanger at regular time every day, including the liquid level of the heat exchanger, the steam inlet pressure, the steam inlet temperature, the water inlet pressure, the water inlet temperature, the water outlet pressure, the water outlet temperature, the drainage temperature, the opening of a drainage valve and the opening of a crisis drainage valve, and simultaneously recording the final water supply flow and the pump outlet water supply flow;
s02), synchronously calculating the temperature rise of the water side, the upper end difference and the lower end difference according to the data recorded in the step S01, wherein: the temperature rise of the water side = the water outlet temperature-the water inlet temperature, the upper end difference = the saturation temperature under the steam inlet pressure-the water outlet temperature, and the lower end difference = the drainage temperature-the water inlet temperature;
s03), checking the data recorded in the steps S01 and S02, and if the single index or a plurality of indexes are found to be abnormally changed, judging whether the heat exchanger leaks or not and judging the leakage point by combining other indexes.
Specifically, the abnormal indexes found in step S03 are analyzed, and if the liquid level of the heat exchanger suddenly rises, the lower end difference suddenly increases, the opening of the drain trap and the opening of the crisis drain trap are synchronously increased, the water supply flow at the outlet of the pump suddenly increases, but the final water supply flow does not change, it is determined that the heat exchanger leaks, and the leaking point is the damage of the heat exchange tube at the water outlet section or the crack of the weld between the tube plate at the end of the water outlet chamber and the heat exchange tube.
Specifically, the abnormal indexes in the step S03 are analyzed, if the liquid level of the heat exchanger suddenly rises, the lower end difference is suddenly reduced, the opening degree of the drain trap and the opening degree of the crisis drain trap are synchronously increased, the water supply flow at the outlet of the pump is suddenly increased, but the final water supply flow is unchanged, the heat exchanger is judged to leak, and the leakage point is that the heat exchange pipe at the water inlet section is damaged or the welding line between the pipe plate at the end of the water inlet chamber and the heat exchange pipe cracks.
Specifically, the abnormal index in step S03 is analyzed, and if the temperature rise at the water side suddenly decreases, the upper end difference suddenly increases, and other indexes have no obvious change, it is determined that the heat exchanger has leaked, and the leakage point is the water chamber partition.
Specifically, the abnormal indexes in the step S03 are analyzed, and if the liquid level of the heat exchanger suddenly fluctuates, the drain temperature suddenly rises, the lower end difference suddenly increases, the obvious vibration of the drain pipeline of the heat exchanger is checked on site, and other indexes have no obvious change, it is determined that the heat exchanger leaks, and the drain cooling section cladding at the leaking position is provided.
In this embodiment, the indicators recorded in steps S01 and S02 both have normal variation curves, and if the variation of the indicator is different from the normal variation curve, the variation is an abnormal variation.
According to the method, the leakage of the heat exchanger can be quickly judged according to the change of the operation index data, the leakage point is roughly determined, equipment operators can conveniently and timely react, the leakage point is prevented from being further expanded, and directional guidance is provided for next-step maintenance.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and modifications and substitutions by those skilled in the art are included in the scope of the present invention.
Claims (5)
1. A method for judging a leakage point of a surface type steam-water heat exchanger is characterized by comprising the following steps: the method comprises the following steps:
s01), recording various indexes of the surface type steam-water heat exchanger at regular time every day, including the liquid level of the heat exchanger, the steam inlet pressure, the steam inlet temperature, the water inlet pressure, the water inlet temperature, the water outlet pressure, the water outlet temperature, the drainage temperature, the opening of a drainage valve and the opening of a crisis drainage valve, and simultaneously recording the final water supply flow and the pump outlet water supply flow;
s02), synchronously calculating the temperature rise of the water side, the upper end difference and the lower end difference according to the data recorded in the step S01, wherein: the temperature rise of the water side = the water outlet temperature-the water inlet temperature, the upper end difference = the saturation temperature under the steam inlet pressure-the water outlet temperature, and the lower end difference = the drainage temperature-the water inlet temperature;
s03), checking the data recorded in the steps S01 and S02, if the abnormal change of a single index or a plurality of indexes is found, judging whether the heat exchanger leaks or not and judging the leakage point by combining other indexes; and (4) analyzing the abnormal indexes found in the step (S03), if the liquid level of the heat exchanger suddenly rises, the lower end difference suddenly increases, the opening degree of the drainage regulating valve and the opening degree of the crisis drainage regulating valve are synchronously increased, the water supply flow at the outlet of the pump suddenly increases, but the final water supply flow is unchanged, judging that the heat exchanger leaks, and judging that the leakage point is the damage of the heat exchange tube at the water outlet section or the crack of the welding seam between the tube plate at the end of the water outlet chamber and the heat exchange tube.
2. The method for judging the leakage point of the surface type steam-water heat exchanger according to claim 1, wherein the method comprises the following steps: and S03, analyzing the abnormal indexes, if the liquid level of the heat exchanger suddenly rises, the lower end difference suddenly decreases, the opening of the drain trap and the opening of the crisis drain trap are synchronously increased, the water supply flow at the outlet of the pump suddenly increases, but the final water supply flow is unchanged, judging that the heat exchanger leaks, and judging that the leakage point is the damage of the heat exchange tube at the water inlet section or the crack of the welding line between the tube plate at the water inlet chamber end and the heat exchange tube.
3. The method for judging the leakage point of the surface type steam-water heat exchanger according to claim 1, wherein the method comprises the following steps: and (4) analyzing the abnormal indexes in the step S03, if the temperature rise at the water side is suddenly reduced, the upper end difference is suddenly increased, and other indexes have no obvious change, judging that the heat exchanger leaks, and the leakage point is a water chamber partition plate.
4. The method for judging the leakage point of the surface type steam-water heat exchanger according to claim 1, wherein the method comprises the following steps: and (4) analyzing the abnormal indexes in the step S03, if the liquid level of the heat exchanger suddenly fluctuates, the hydrophobic temperature suddenly rises, the lower end difference suddenly increases, and the obvious vibration of the water pipeline of the heat exchanger is checked on site, and other indexes have no obvious change, judging that the heat exchanger leaks, and cladding the hydrophobic cooling section at the leaking position.
5. The method for judging the leakage point of the surface type steam-water heat exchanger according to any one of claims 2 to 4, wherein: the index recorded in steps S01 and S02 has a normal change curve, and if the index change is different from the normal change curve, it is an abnormal change.
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| CN113029467B (en) * | 2021-03-09 | 2022-09-13 | 山东大学 | System for judging insufficient welding degree of plate-fin heat exchanger and working method |
| CN112880919A (en) * | 2021-03-25 | 2021-06-01 | 中电华创电力技术研究有限公司 | Method and device for detecting pipe side leakage of high-pressure heater of steam turbine system |
| CN113218596B (en) * | 2021-04-29 | 2023-09-05 | 中电华创电力技术研究有限公司 | Leakage detection method and device for #4 low-pressure heater of coal-fired power generation unit |
| CN113218595B (en) * | 2021-04-29 | 2023-06-30 | 中电华创电力技术研究有限公司 | Method, device and system for detecting side leakage of low-pressure heater tube of steam turbine |
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| CN104596347A (en) * | 2014-12-31 | 2015-05-06 | 天津渤化中河化工有限公司 | Method and device capable of rapidly judging cooler leakage in maleic anhydride production |
| CN104567531A (en) * | 2014-12-31 | 2015-04-29 | 天津渤化中河化工有限公司 | Method for quickly determining condenser leakage in maleic anhydride production |
| CN105043159B (en) * | 2015-07-24 | 2017-11-07 | 东方电气集团东方锅炉股份有限公司 | A kind of steam condenser cartridge igniter monitoring system and its monitoring method |
| CN105091631A (en) * | 2015-09-01 | 2015-11-25 | 中国科学院上海高等研究院 | Coaxial tubular heat exchanger with function of monitoring leakage in real time |
| CN106545957B (en) * | 2016-10-11 | 2019-04-23 | 广东工业大学 | Variable frequency air conditioner refrigerant leakage detection method based on speed interval parameters |
| CN206656625U (en) * | 2017-04-11 | 2017-11-21 | 北京市煤气热力工程设计院有限公司 | A kind of shell-and-tube heat exchanger for heated by natural gas of band leakage warning function |
| CN109307258A (en) * | 2018-09-03 | 2019-02-05 | 福建省鸿山热电有限责任公司 | A kind of overcritical heat supply thermal power plant high temperature heater (HTH) leak judgment method |
| CN110197049B (en) * | 2019-07-01 | 2023-05-26 | 常州港华燃气有限公司 | Non-metal pipeline leakage positioning method based on transient inverse problem |
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