CN113686525B - An online leakage alarm system and method for heat exchange tubes in a high-ash and low-temperature flue gas environment - Google Patents
An online leakage alarm system and method for heat exchange tubes in a high-ash and low-temperature flue gas environment Download PDFInfo
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- CN113686525B CN113686525B CN202111094161.8A CN202111094161A CN113686525B CN 113686525 B CN113686525 B CN 113686525B CN 202111094161 A CN202111094161 A CN 202111094161A CN 113686525 B CN113686525 B CN 113686525B
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- 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
- G01M3/26—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
- G01M3/28—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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Abstract
The invention discloses a heat exchange pipe online leakage alarm system and a method under a high-ash low-temperature flue gas environment, wherein an outlet of a first electric valve of a system inlet is connected with one end of an inlet valve of a heat exchanger through a second electric valve of the system inlet, the other end of the inlet valve of the heat exchanger is connected with an inlet of an inlet large header of the heat exchanger, an outlet of the inlet large header of the heat exchanger is connected with an inlet of a small header of a module inlet through an inlet valve of the module, an outlet of the small header of the module inlet is connected with an inlet of the small header of the module outlet through a heat exchange pipe, an outlet of the small header of the module outlet is connected with an inlet of the large header of the heat exchanger through an outlet valve of the module outlet, the second electric valve of the system outlet and the first electric valve of the system outlet are connected with an outlet of an n-1-level low-pressure heater, and the system and the method can find leakage of the heat exchange pipe in time.
Description
Technical Field
The invention belongs to the technical field of detection, and relates to an online leakage alarm system and method for a heat exchange tube in a high-ash low-temperature flue gas environment.
Background
The low-temperature heat exchanger is widely applied to the coal-fired generator set, mainly absorbs the waste heat of the discharged smoke of the smoke, and heats the condensed water to reduce the coal consumption of the generator set. The low-temperature heat exchanger is generally arranged at the inlet of the dust remover, and the temperature of the flue gas entering the dust remover can be reduced although the content of fly ash in the flue gas is higher, SO that the dust removal efficiency is improved, meanwhile, the flue gas temperature is reduced to be below an acid dew point, SO 3 and various metal pollutants can be removed, the exhaust gas waste heat absorbed by the low-temperature heat exchanger can also be used for heating a hot water heater, the inlet air temperature and the outlet flue gas temperature of the air preheater are greatly improved, and low-temperature corrosion and ammonium bisulfate ash blocking are effectively relieved, SO that the low-temperature heat exchanger technology is widely applied in China. However, the domestic coal quality is variable, the coal quality is poor, the base sulfur content, the ash content and the water content are high, meanwhile, ammonia in tail flue gas escapes beyond standard, the corrosiveness of the flue gas is high, and the leakage problem generally occurs after the low-temperature heat exchanger is operated for a period of time.
The low-temperature heat exchanger is arranged in the flue, the sectional area of the flue is larger, the content of fly ash in the flue gas is more, if the fly ash can not be found and treated in time after the heat exchange tube leaks, the leaked condensed water can react with the fly ash, so that the problems of hardening, ash blocking, corrosion and the like of the fly ash are caused, and meanwhile, the condensed water leaks into the electrostatic precipitator, and a series of problems such as tripping of the electrostatic precipitator or blockage of an ash dredging pipeline are also caused.
At present, leakage detection mainly passes through a hygrometer, but because the content of fly ash in flue gas is higher, a probe of the hygrometer is blocked, so that the hygrometer is invalid, the sectional area of a flue is too large, the hygrometer can only detect a little humidity, and the problem cannot be effectively solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an online leakage alarm system and an online leakage alarm method for a heat exchange tube in a high-ash low-temperature flue gas environment.
In order to achieve the above purpose, the on-line leakage alarm system for the heat exchange tubes in the high ash low temperature flue gas environment comprises n-level low pressure heaters, wherein a first system inlet electric valve, a second system outlet electric valve, a first system outlet electric valve and a plurality of heat exchangers are arranged between two adjacent low pressure heaters, each heat exchanger comprises a heat exchanger inlet valve, a heat exchanger outlet valve, a heat exchanger inlet large header, a heat exchanger outlet large header and a plurality of heat exchange modules, and each heat exchange module comprises a module inlet valve, a module outlet valve, a module inlet small header, a module outlet small header and a plurality of heat exchange tubes;
The outlet of the n-level low-pressure heater is connected with the inlet of the n-1-level low-pressure heater and the inlet of a first electric valve of a system inlet, the outlet of the first electric valve of the system inlet is connected with one end of an inlet valve of a heat exchanger through a second electric valve of the system inlet, the other end of the inlet valve of the heat exchanger is connected with the inlet of an inlet large header of the heat exchanger, the outlet of the inlet large header of the heat exchanger is connected with the inlet of a small header of the module inlet through an inlet valve of the module, the outlet of the small header of the module inlet is connected with the inlet of the small header of the module outlet through a heat exchange pipe, the outlet of the small header of the module outlet is connected with the inlet of the outlet large header of the heat exchanger through an outlet valve of the heat exchanger, the second electric valve of the system outlet and the first electric valve of the system outlet, and n is a positive integer greater than or equal to 2.
And a heat exchanger on-site pressure gauge is arranged on the large heat exchanger outlet header.
And a module on-site pressure gauge is arranged on the module outlet small header.
The second electric valve of the system inlet is connected with one end of the inlet valve of the heat exchanger through the manual valve of the system inlet and the booster pump.
And a system remote pressure transmitter is arranged at the outlet of the booster pump.
The outlet of the heat exchanger outlet large header is connected with the outlet of the n-1 level low-pressure heater through a heat exchanger outlet valve, a system outlet manual valve, a system outlet second electric valve and a system outlet first electric valve.
The invention relates to an on-line leakage alarm method for a heat exchange tube in a high-ash low-temperature flue gas environment, which comprises the following steps:
Judging whether the whole system is leaked, when the whole system is leaked, firstly confirming the leaked heat exchanger, then judging the leaked heat exchange tube in a mode of isolating the heat exchange tube, and then isolating the leaked heat exchange tube, wherein the rest heat exchange tubes continue to operate.
The method specifically comprises the following steps:
1) System-on-a-whole isolation
Closing a first electric valve at the inlet of the system, a second electric valve at the inlet of the system, a first electric valve at the outlet of the system and a second electric valve at the outlet of the system, observing the change condition of the pressure at the water side to judge whether the whole system is leaked, and turning to the step 2 when the whole system is leaked;
2) Isolation of single heat exchanger
Opening a first electric valve at the inlet of the system and a second electric valve at the inlet of the system, recovering the water pressure of the heat exchanger, closing all the inlet valves and outlet valves of the heat exchanger, judging whether each heat exchanger leaks according to the change condition of the water pressure in each heat exchanger, and turning to the step 3 when any heat exchanger leaks;
3) Isolation of individual heat exchange tubes
Opening the inlet valve of the heat exchanger in the leaked heat exchanger, recovering the water pressure of the leaked heat exchanger, closing all the inlet valves and outlet valves of the modules in the leaked heat exchanger, judging whether the heat exchange tube is leaked according to the pressure change condition of the water side of each heat exchange tube, and replacing the leaked heat exchange tube.
The invention has the following beneficial effects:
When the system and the method for on-line leakage alarm of the heat exchange tube in the high-ash low-temperature flue gas environment are specifically operated, the leaked heat exchange tube is searched according to the change condition of the water side pressure of the closed system, the leaked heat exchange tube is isolated, other heat exchange tubes are restored to operate, the influence of leakage on the low-temperature heat exchanger system is reduced to the greatest extent, in addition, the first electric valve at the system inlet and the second electric valve at the system inlet are arranged, the risk of leakage in the valves is reduced to the greatest extent, meanwhile, the system leakage detection can be completed by utilizing remote operation, the system is convenient and quick, the investment is low, the practicability is high, and the leakage can be quickly found and treated.
Furthermore, the heat exchanger on-site pressure gauge is arranged on the large heat exchanger outlet header, and the module on-site pressure gauge is arranged on the small module outlet header, so that the leakage detection requirement can be met, and the cost can be reduced.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2a is a graph showing the pressure change of the working medium without internal leakage of the valve and without leakage of the heat exchange tube 11;
FIG. 2b is a graph of the pressure change of the working medium with small leakage in the valve and no leakage in the heat exchange tube 11;
FIG. 2c is a graph of the pressure change of the working medium with larger leakage in the valve and without leakage in the heat exchange tube 11;
FIG. 2d is a graph of pressure change of working medium with less leakage of the heat exchange tube 11 due to no internal leakage of the valve;
Fig. 2e is a graph of the pressure change of the working medium with no internal leakage of the valve and large leakage of the heat exchange tube 11.
The system comprises a low-pressure heater of level 1, a low-pressure heater of level 2 and a first electric valve of system inlet 3, a second electric valve of system inlet 4, a manual valve of system inlet 5, a booster pump 6, a heat exchanger inlet valve 7, a heat exchanger outlet valve 8, a heat exchanger inlet large header 9, a heat exchanger outlet large header 10, a heat exchange tube 11, a module inlet small header 12, a module outlet small header 13, a manual valve of system outlet 14, a second electric valve of system outlet 15, a first electric valve of system outlet 16, a module on-site pressure gauge 17, a remote pressure transmitter of system 18, a local pressure gauge of heat exchanger 19, a module inlet valve 20 and a module outlet valve 21.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, the on-line leakage alarm system and method for heat exchange tubes in high ash low temperature flue gas environment of the invention comprise n stages of low pressure heaters 1, wherein a first system inlet electric valve 3, a second system inlet electric valve 4, a manual system inlet valve 5, a booster pump 6, a manual system outlet valve 14, a second system outlet electric valve 15, a first system outlet electric valve 16 and a plurality of heat exchangers are arranged between two adjacent stages of low pressure heaters, wherein each heat exchanger comprises a heat exchanger inlet valve 7, a heat exchanger outlet valve 8, a heat exchanger inlet header 9, a heat exchanger outlet header 10 and a plurality of heat exchange modules, each heat exchange module comprises a module inlet valve 20, a module outlet valve 21, a module inlet header 12, a module outlet header 13 and a plurality of heat exchange tubes 11;
The outlet of the n-level low-pressure heater 1 is connected with the inlet of the n-1-level low-pressure heater 2 and the inlet of the first electric valve 3 of the system inlet, the outlet of the first electric valve 3 of the system inlet is connected with the inlet of the manual valve 5 of the system inlet and the inlet of the booster pump 6 through the second electric valve 4 of the system inlet, the inlet of the booster pump 6 is connected with one end of the inlet valve 7 of the heat exchanger, the other end of the inlet valve 7 of the heat exchanger is connected with the inlet of the inlet big header 9 of the heat exchanger, the outlet of the inlet big header 9 of the heat exchanger is connected with the inlet of the small header 12 of the module inlet through the inlet valve 20 of the module, the outlet of the small header 12 of the module inlet is connected with the inlet of the small header 13 of the module outlet through the heat exchange tube 11, the outlet of the small header 13 of the module outlet is connected with the inlet of the big header 10 of the heat exchanger outlet through the outlet valve 21, the outlet of the big header 10 of the heat exchanger is connected with the outlet valve 8 of the heat exchanger, the manual valve 14 of the system outlet, the second electric valve 15 of the system outlet and the first electric valve 16 of the system outlet are connected with the outlet of the n-1-level low-pressure heater 2, and n is a positive integer greater than or equal to 2.
A system remote pressure transmitter 18 is mounted at the outlet of the booster pump 6.
The heat exchanger on-site pressure gauge 19 is mounted on the heat exchanger outlet header 10.
The module outlet small header 13 is provided with a module on-site pressure gauge 17.
The invention relates to an on-line leakage alarm method for a heat exchange tube in a high-ash low-temperature flue gas environment, which comprises the following steps:
The first electric valve 3 at the system inlet, the second electric valve 4 at the system inlet, the first electric valve 16 at the system outlet and the second electric valve 15 at the system outlet are closed, so that the cryogenic heat exchanger system forms a closed system, and the pressure in the system changes when the heat exchange tube 11 leaks due to the fact that the working medium in the system is incompressible fluid. Specifically, according to the change curve of working medium pressure, whether the system leaks is judged, and whether the first electric valve 3 of system entry and the second electric valve 4 of system entry leak in the emergence simultaneously is judged, if leak in the emergence, in time change to influence leak hunting effect.
When the leakage of the first electric valve 3 at the system inlet or the second electric valve 4 at the system inlet is larger than that of the heat exchange tube 11 and the leakage of the valve is smaller, the pressure change curve of the working medium is shown in figure 2b;
when the leakage of the first electric valve 3 at the system inlet or the second electric valve 4 at the system inlet is larger than that of the heat exchange tube 11 and the leakage of the valve is larger, the pressure change curve of the working medium is shown as figure 2c;
When the leakage of the first electric valve 3 at the system inlet or the second electric valve 4 at the system inlet is smaller than that of the heat exchange tube 11 and the leakage of the heat exchange tube 11 is smaller, the pressure change curve of the working medium is shown in figure 2d;
And when the leakage of the first electric valve 3 at the system inlet or the second electric valve 4 at the system inlet is smaller than that of the heat exchange tube 11 and the leakage of the heat exchange tube 11 is larger, the pressure change curve of the working medium is shown in figure 2e.
When the leakage of the system is found, firstly judging the leaked heat exchanger, then judging the leaked heat exchange tube 11 in a mode of isolating the heat exchange tube 11, and then isolating the leaked heat exchange tube 11, wherein the rest heat exchange tubes 11 continue to operate, and the specific measures are as follows:
1) Closing a first electric valve 3 at a system inlet, a second electric valve 4 at a system inlet, a first electric valve 16 at a system outlet and a second electric valve 15 at a system outlet, observing the change condition of the pressure at the water side, and judging whether the whole system leaks or not;
2) Shan Huanre, isolating the heat exchanger, namely after the integral isolation of the system is found to leak, performing single heat exchanger isolation operation, opening a first electric valve 3 at the inlet of the system and a second electric valve 4 at the inlet of the system, recovering the water pressure of the heat exchanger again, closing all inlet valves 7 and outlet valves 8 of the heat exchanger, and judging whether the heat exchanger leaks according to the change condition of the water pressure in the heat exchanger;
3) The individual heat exchange tubes 11 are isolated and after finding the leaking heat exchanger, the leaking heat exchange tube 11 is found further. Opening a heat exchanger inlet valve 7 of the leakage heat exchanger, recovering the water pressure of the heat exchanger again, closing all module inlet valves 20 and module outlet valves 21 in the leakage heat exchanger, judging whether the heat exchange tube 11 leaks according to the water side pressure change condition of each heat exchange tube 11, repeating the steps, detecting all the leaked heat exchangers, and marking the leaked heat exchange tubes 11;
4) System recovery operation
Isolating all leaked heat exchange pipes 11, opening other valves, integrally isolating the system according to the step 1), and recovering the operation of the whole system after confirming no leakage.
It should be noted that, when the heat exchanger is operating normally, the first electrically operated valve 3 at the system inlet, the second electrically operated valve 4 at the system inlet, the first electrically operated valve 16 at the system outlet and the second electrically operated valve 15 at the system outlet are closed, so that the cryogenic heat exchanger system forms a closed system, and because the working medium in the system is incompressible fluid, if the heat exchange tube 11 leaks, the pressure in the system will change, at this time, according to the change curve of the working medium pressure, whether the system leaks is judged, and meanwhile, whether the first electrically operated valve 3 at the system inlet, the second electrically operated valve 4 at the system inlet, the first electrically operated valve 16 at the system outlet and the second electrically operated valve 15 at the system outlet leak, if so, the leak detection effect is not affected, the system should be replaced in time. When the leakage of the system is found, the leaked heat exchanger is judged firstly, then the leaked heat exchange tube 11 is judged by isolating the heat exchange tube 11, then the leaked heat exchange tube 11 is isolated, and the rest heat exchange tubes 11 continue to operate.
Claims (6)
1. The heat exchange tube online leakage alarm system under the high-ash low-temperature flue gas environment is characterized by comprising n stages of low-pressure heaters (1), wherein a first system inlet electric valve (3), a second system inlet electric valve (4), a second system outlet electric valve (15), a first system outlet electric valve (16) and a plurality of heat exchangers are arranged between two adjacent stages of low-pressure heaters, each heat exchanger comprises a heat exchanger inlet valve (7), a heat exchanger outlet valve (8), a heat exchanger inlet large header (9), a heat exchanger outlet large header (10) and a plurality of heat exchange modules, and each heat exchange module comprises a module inlet valve (20), a module outlet valve (21), a module inlet small header (12), a module outlet small header (13) and a plurality of heat exchange tubes (11);
the outlet of the n-level low-pressure heater (1) is connected with the inlet of the n-1-level low-pressure heater (2) and the inlet of the first electric valve (3) of the system inlet, the outlet of the first electric valve (3) of the system inlet is connected with one end of the inlet valve (7) of the heat exchanger through the second electric valve (4) of the system inlet, the other end of the inlet valve (7) of the heat exchanger is connected with the inlet of the inlet large header (9) of the heat exchanger, the outlet of the inlet large header (9) of the heat exchanger is connected with the inlet of the small header (12) of the module inlet through the inlet valve (20) of the module, the outlet of the small header (12) of the module inlet is connected with the inlet of the small header (13) of the module outlet through the outlet valve (21) of the module, the outlet of the large header (10) of the heat exchanger is connected with the outlet of the large header (10) of the heat exchanger through the outlet valve (8) of the system outlet second electric valve (15) and the first electric valve (16) of the system outlet, and n is an integer greater than or equal to 2;
a heat exchanger on-site pressure gauge (19) is arranged on the heat exchanger outlet large header (10);
And a module on-site pressure gauge (17) is arranged on the module outlet small header (13).
2. The on-line leakage alarm system for the heat exchange tube in the high-ash low-temperature flue gas environment according to claim 1, wherein the second electric valve (4) at the system inlet is connected with one end of the valve (7) at the heat exchanger inlet through the manual valve (5) at the system inlet and the booster pump (6).
3. The on-line leakage alarm system for heat exchange tubes in a high ash low temperature flue gas environment according to claim 2, wherein a system remote pressure transmitter (18) is installed at the outlet of the booster pump (6).
4. The on-line leakage alarm system for heat exchange tubes in a high ash low temperature flue gas environment according to claim 1, wherein the outlet of the heat exchanger outlet large header (10) is connected with the outlet of the n-1 level low pressure heater (2) through a heat exchanger outlet valve (8), a system outlet manual valve (14), a system outlet second electric valve (15) and a system outlet first electric valve (16).
5. The on-line leakage alarm method for the heat exchange tube in the high-ash low-temperature flue gas environment is characterized by comprising the following steps of:
judging whether the whole system is leaked, when the whole system is leaked, firstly confirming the leaked heat exchanger, then judging the leaked heat exchange tube (11) in a mode of isolating the heat exchange tube (11), and then isolating the leaked heat exchange tube (11), wherein the rest heat exchange tubes (11) continue to operate.
6. The on-line leakage alarm method for the heat exchange tube in the high-ash low-temperature flue gas environment according to claim 5, which is characterized by comprising the following steps:
1) System-on-a-whole isolation
Closing a first electric valve (3) at a system inlet, a second electric valve (4) at a system inlet, a first electric valve (16) at a system outlet and a second electric valve (15) at a system outlet, observing the change condition of the pressure at the water side to judge whether the whole system leaks, and turning to the step 2 when the whole system leaks;
2) Isolation of single heat exchanger
Opening a first electric valve (3) at the inlet of the system and a second electric valve (4) at the inlet of the system, recovering the water pressure of the heat exchangers, closing all the inlet valves (7) and outlet valves (8) of the heat exchangers, judging whether each heat exchanger leaks according to the change condition of the water pressure in each heat exchanger, and turning to the step 3 when any heat exchanger leaks;
3) Isolation of individual heat exchange tubes (11)
Opening a heat exchanger inlet valve (7) in the leaked heat exchanger, recovering the water pressure of the leaked heat exchanger, closing all module inlet valves (20) and module outlet valves (21) in the leaked heat exchanger, judging whether the heat exchange tube (11) leaks according to the water side pressure change condition of each heat exchange tube (11), and replacing the leaked heat exchange tube (11).
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| CN107063587B (en) * | 2017-04-21 | 2018-12-25 | 河北冀研能源科学技术研究院有限公司 | Power plant boiler flue low-level (stack-gas) economizer heat-exchanging tube bundle leakage anticipation device and method |
| JP7084155B2 (en) * | 2018-02-20 | 2022-06-14 | 三菱重工エンジニアリング株式会社 | Tube leak detection device and tube leak detection method |
| CN111750371A (en) * | 2020-07-23 | 2020-10-09 | 西安西热锅炉环保工程有限公司 | A kind of steam heating system and method for on-line treatment of ammonium hydrogen sulfate viscous ash deposition |
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