CN210511077U - Heat exchange pipe leakage online diagnosis device of heat supply unit - Google Patents
Heat exchange pipe leakage online diagnosis device of heat supply unit Download PDFInfo
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- CN210511077U CN210511077U CN201921216912.7U CN201921216912U CN210511077U CN 210511077 U CN210511077 U CN 210511077U CN 201921216912 U CN201921216912 U CN 201921216912U CN 210511077 U CN210511077 U CN 210511077U
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Abstract
The utility model provides a heat exchange tube leaks online diagnostic device for heat supply unit, heat exchange tube leak online diagnostic device carries out independent sample measurement through increasing the sampling point in every heat exchanger condensate outlet to through intelligent diagnostic system real-time supervision heat exchanger running state, when the heat exchanger can be real-time when leaking, accurate judgement concrete which heat exchanger has the leakage, for the heat supply unit does not shut down the processing heat exchange tube in service and leaks and provide accurate reliable decision-making foundation.
Description
Technical Field
The utility model relates to a power generation technical field especially relates to a heat supply unit heat exchange tube leaks online diagnostic device.
Background
Leakage of the heat exchanger of the heat supply unit is one of important hidden troubles which troubles safe operation of each power plant for a long time. After the heat exchanger takes place to leak, the condensate water is polluted, and the condensate water after most power plant's heat transfer returns the oxygen-eliminating device, in case the heat exchanger has the leakage and will lead to water supply system steam quality to worsen, causes the thermodynamic system to corrode the scale deposit, seriously threatens the safe operation of unit.
The existing heat exchange station of the heat supply unit is not provided with any leakage detection equipment, only when each water vapor index of the water supply system is unqualified, manual sampling is carried out through a heat exchanger on-site sampling valve, the sampling is analyzed and eliminated one by one, and after the leaked heat exchanger is found out, splitting or discharging is carried out.
The problems commonly existing in the manual inspection and the elimination of the leakage of the heat exchanger are as follows: 1) the leakage is not detected in time, and the leakage is detected only when the water quality of the water supply system is deteriorated, so that certain corrosion and scaling of a thermodynamic system are caused. 2) The safety risk is high, and the condensate temperature after the heat transfer is generally about 90 ℃, and there is the risk of scalding in the manual sample on the spot. 3) The sampling is poor in representativeness, the local sampling valve is always closed, the corrosion products remained in the pipeline cannot be washed clean by opening the sampling for a short time, and the manual sampling measurement error is large, so that misjudgment and traitor are easily caused.
Therefore, a new online detection technology capable of rapidly judging whether leakage exists in the operation of the heat exchanger of the heat supply unit is urgently needed by a power plant.
Disclosure of Invention
An object of the utility model is to provide an online diagnostic device is leaked to heat exchange tube of heat exchanger unit, fundamentally has solved among the heat exchange unit heat exchange tube does not have the sampling point and artifical sample measurement misjudgment, false traitor leads to the steam system to corrode scale deposit problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a heat exchanger of a heat supply unit is divided into M groups, each group of N heat exchangers, the leakage online diagnosis device of a first heat exchanger 1A in the N heat exchangers comprises a first heat exchanger 1A, a first heat supply water inlet pipeline 2A, a first heat supply water outlet pipeline 3A, a first high-temperature steam inlet pipeline 4A and a first condensed water outlet pipeline 5A which are communicated with the first heat exchanger 1A, the first condensed water outlet pipeline 5A is divided into three paths which are respectively a pipeline to an outdoor drainage tank, a pipeline to the condensed water tank and a first sampling pipeline, a connection point of the first sampling pipeline and the first condensed water outlet pipeline 5A is a first on-site sampling point 6A, and a first sampling valve 7A, a first stop valve 8A, a first Y-shaped filter 9A, a first cooler 10A, a first #1 needle-shaped regulating valve 11A, a second sampling valve 6A are sequentially arranged on the first sampling pipeline, A first electromagnetic valve 12A and a first #1 flowmeter 13A, a cooling water inlet 14 and a cooling water outlet 15 communicated with the first cooler 10A; a sampling pipeline of each heat exchanger in the N heat exchangers is gathered into a main pipeline, the inlet of the main pipeline is divided into two paths, one path is communicated with a condensate tank or an external water discharge tank, a #3 needle-shaped regulating valve 20 is arranged on the pipeline, the other path is a sampling pipeline, the outlet of the sampling pipeline is communicated with the condensate tank or the external water discharge tank, a #2 needle-shaped regulating valve 16, a #2 flow meter 17, a hydrogen exchange column 18 and a conductivity meter 19 are arranged on the sampling pipeline, the #2 needle-shaped regulating valve 16 regulates the flow of a water sample entering the conductivity meter 19, and the water sample can meet the measurement requirement, and the intelligent diagnosis system 21.
High-temperature steam in the first high-temperature steam inlet pipeline 4A enters the first heat exchanger 1A and is condensed into condensed water, the heat supply inlet water in the first heat supply inlet pipeline 2A is heated by the first heat exchanger 1A to be heat supply outlet water, and the heat supply outlet water supplies heat to users through the first heat supply outlet pipeline 3A.
The first cooler 10A is internally provided with a serpentine cooling pipe, cooling water flows in the serpentine cooling pipe to cool condensed water outside the serpentine cooling pipe, the N coolers share the cooling water, and the cooling water of the N coolers is arranged in series.
The intelligent diagnosis system 21 comprises a data acquisition module and a PLC (programmable logic controller) connected with the data acquisition module, wherein the data acquisition module is connected with the conductivity meter 19, and the PLC is connected with an electromagnetic valve of each sampling pipeline to control the opening and closing of the electromagnetic valve.
According to the online diagnosis method of the online diagnosis device for the leakage of the heat exchange pipes of the heat supply unit, the measured value is N heat exchanger condensed water mixed samples during normal operation, if the hydrogen conductivity of the condensed water mixed samples is kept unchanged, no leakage exists, condensed water flows to a condensed water tank, and when the hydrogen conductivity of the condensed water mixed samples is changed, the PLC of the intelligent diagnosis system 21 controls the electricity of each sampling pipeline in an interlocking modeOpening and closing the magnetic valve, acquiring 19 data of the conductivity meter on each sampling pipeline one by the data acquisition module, comparing the conductivity measurement results of different measuring points by the PLC, and when the value of the conductivity meter 19 on a certain sampling pipeline is higher than the values of the conductivity meters 19 on other sampling pipelines, indicating that the heat exchanger corresponding to the sampling pipeline leaks, and discharging the condensed water at the outlet of the heat exchanger to an external water discharge tank; according to the interlocking control process, the electromagnetic valve of each sampling pipeline is opened in sequence, the leakage condition of the corresponding heat exchanger can be judged, and the heat supply and water inlet conductivity K is combinedHeating ofAnd calculating the leakage rate, the leakage amount and the equivalent diameter of the leakage hole according to the flow rate V and the flow rate mu of the condensate.
Compared with the prior art, the utility model has the following advantages.
1) And whether leakage exists in each heat exchanger can be judged in real time.
2) The leakage of which heat exchanger can be quickly and accurately judged, precious time is won for the heat exchanger which is split in operation, damage to the unit caused by leakage of the heat exchanger is avoided or reduced to the maximum extent, and meanwhile, a basis is provided for follow-up heat exchanger maintenance.
3) Avoid the water vapor quality deterioration of the water supply system and the thermal corrosion and scaling.
4) The whole process adopts automatic control, and the labor cost is reduced.
Drawings
Fig. 1 is a schematic diagram of the heat exchange tube leakage online diagnosis device of the heat supply unit of the present invention.
Wherein: 1A-1N are a first heat exchanger to an Nth heat exchanger, 2A-2N are a first heat supply water inlet pipeline to an Nth heat supply water inlet pipeline, 3A-3N are a first heat supply water outlet pipeline to an Nth heat supply water outlet pipeline, 4A-4N are a first high-temperature steam inlet pipeline to an Nth high-temperature steam inlet pipeline, 5A-5N are a first condensate outlet pipeline to an Nth condensate outlet pipeline, 6A-6N are a first on-site sampling point to an Nth on-site sampling point, 7A-7N are a first sampling valve to an Nth sampling valve, 8A-8N are a first stop valve to an Nth stop valve, 9A-9N are a first Y-type filter to an NY-type filter, 10A-10N are a first cooler to an Nth cooler, 11A-11N are a first #1 needle-shaped regulating valve to an Nth #1 needle-shaped regulating valve, 12A-12N are a first electromagnetic valve to an Nth electromagnetic valve, 13A to 13N are a first #1 flowmeter to an N #1 flowmeter, 14 is cooling water inlet water, 15 is cooling water outlet water, 16 is a #2 needle regulating valve, 17 is a #2 flowmeter, 18 is a hydrogen exchange column, 19 is an electric conductivity meter, 20 is a #3 needle regulating valve, and 21 is an intelligent diagnosis system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention relates to an online diagnosis device for heat exchange tube leakage of a heat supply unit, wherein the heat exchangers of the heat supply unit are divided into M groups, N heat exchangers are arranged in each group, and a first heat exchanger 1A of the N heat exchangers is taken as an example for explanation.
The online leakage diagnosis device for the first heat exchanger 1A of the N heat exchangers includes the first heat exchanger 1A, a first heat supply water inlet pipeline 2A, a first heat supply water outlet pipeline 3A, a first high-temperature steam inlet pipeline 4A and a first condensed water outlet pipeline 5A which are communicated with the first heat exchanger 1A, wherein the first condensed water outlet pipeline 5A is divided into three paths which are respectively a pipeline to an outdoor drain tank, a pipeline to a condensed water tank and a first sampling pipeline, the connection point of the first sampling pipeline and the first condensed water outlet pipeline 5A is a first on-site sampling point 6A, the first sampling pipeline is sequentially provided with a first sampling valve 7A, a first stop valve 8A, a first Y-shaped filter 9A, a first cooler 10A, a first #1 needle-shaped regulating valve 11A, a first electromagnetic valve 12A and a first #1 flowmeter 13A, and a cooling water inlet 14 and a cooling water outlet 15 which are communicated with the first cooler 10A; a sampling pipeline of each heat exchanger in the N heat exchangers is gathered into a main pipeline, the inlet of the main pipeline is divided into two paths, one path is communicated with a condensate tank or an external water discharge tank, a #3 needle-shaped regulating valve 20 is arranged on the pipeline, the other path is a sampling pipeline, the outlet of the sampling pipeline is communicated with the condensate tank or the external water discharge tank, a #2 needle-shaped regulating valve 16, a #2 flow meter 17, a hydrogen exchange column 18 and a conductivity meter 19 are arranged on the sampling pipeline, the #2 needle-shaped regulating valve 16 regulates the flow of a water sample entering the conductivity meter 19, and the water sample can meet the measurement requirement, and the intelligent diagnosis system 21.
High-temperature steam in the first high-temperature steam inlet pipeline 4A enters the first heat exchanger 1A and is condensed into condensed water, heat supply inlet water in the first heat supply inlet pipeline 2A is heated by the first heat exchanger 1A to be heat supply outlet water, and the heat supply outlet water supplies heat to users through the first heat supply outlet pipeline 3A. The condensed water in the first condensed water outlet pipeline 5A is delivered to the condensed water tank under the qualified condition, and is delivered to the external drainage tank under the unqualified condition. The temperature of the condensed water is generally about 90 ℃, the water temperature is higher and contains certain impurities, and the temperature of the condensed water is reduced to room temperature through a first cooler 10A after insoluble impurities are removed from the condensed water by a first Y-shaped filter 9A.
The first cooler 10A is internally provided with a serpentine cooling pipe, cooling water flows in the serpentine cooling pipe to cool condensed water outside the serpentine cooling pipe, the N coolers share the cooling water, and the cooling water of the N coolers is arranged in series.
The intelligent diagnosis system 21 comprises a data acquisition module and a PLC (programmable logic controller) connected with the data acquisition module, wherein the data acquisition module is connected with the conductivity meter 19, and the PLC is connected with an electromagnetic valve of each sampling pipeline to control the opening and closing of the electromagnetic valve.
The utility model discloses heat supply unit heat exchange tube leaks on-line diagnosis device's online diagnostic method, each heat exchanger of intelligent diagnosis system real-time supervision leaks the condition, introduces the data acquisition module with electric conductivity table 19 data, and the data acquisition module feeds back data to the PLC program, and the conductivity measurement result of the different measurement stations of PLC comparison, PLC and solenoid valve 12(A ~ N) interlocking control. When the heat exchanger leaks, the hydrogen conductivity is increased, the data acquisition module feeds the result back to the PLC, the PLC controls the electromagnetic valves 12 (A-N), the first electromagnetic valve 12A is opened, the electromagnetic valves 12B-12N are closed, the hydrogen conductivity change condition is observed, if the original level is kept, no leakage exists, condensed water flows to a condensed water tank, and if the conductivity meter value is increased, the leakage of the first heat exchanger 1A is indicated, and the condensed water flows to an external drainage tank; according to the interlocking control program, the leakage condition of the heat exchangers (1A-1N) can be judged by sequentially opening 12B-12N, and the heat supply and water inlet conductivity K is combinedHeating ofAnd calculating the leakage rate, the leakage amount and the equivalent diameter of the leakage hole according to the flow rate V and the flow rate mu of the condensate.
Claims (3)
1. The utility model provides a heat supply unit heat exchange tube leaks online diagnostic device, the heat exchanger of heat supply unit divide into M group, every N heat exchangers of group, its characterized in that: the leakage online diagnosis device of a first heat exchanger in the N heat exchangers comprises a first heat exchanger (1A), a first heat supply water inlet pipeline (2A) communicated with the first heat exchanger (1A), a first heat supply water outlet pipeline (3A), a first high-temperature steam inlet pipeline (4A) and a first condensed water outlet pipeline (5A), wherein the first condensed water outlet pipeline (5A) is divided into three paths, namely a pipeline to an outdoor drain tank, a pipeline to a condensed water tank and a first sampling pipeline, the connection point of the first sampling pipeline and the first condensed water outlet pipeline (5A) is a first on-site sampling point (6A), a first sampling valve (7A), a first stop valve (8A), a first Y-shaped filter (9A), a first cooler (10A), a first #1 needle-shaped regulating valve (11A), a first electromagnetic valve (12A) and a first #1 flow meter (13A) are sequentially arranged on the first sampling pipeline, a cooling water inlet (14) and a cooling water outlet (15) which are communicated with the first cooler (10A); a sampling pipeline of each heat exchanger in the N heat exchangers is gathered into a main pipeline, the inlet of the main pipeline is divided into two pipelines, one pipeline is connected to a condensate tank or an outer water discharge tank, a #3 needle-shaped regulating valve (20) is arranged on the pipeline, the other pipeline is a sampling pipeline, the outlet of the sampling pipeline is communicated with the condensate tank or the outer water discharge tank, a #2 needle-shaped regulating valve (16), (a #2 flow meter (17), a hydrogen exchange column (18) and a conductivity meter (19) are arranged on the sampling pipeline, and the intelligent diagnosis system (21) is further included.
2. The heat supply unit heat exchange pipe leakage online diagnosis device according to claim 1, characterized in that: the first cooler (10A) is internally provided with a serpentine cooling pipe, cooling water flows in the serpentine cooling pipe to cool condensed water outside the serpentine cooling pipe, the N coolers share the cooling water, and the cooling water of the N coolers is arranged in series.
3. The heat supply unit heat exchange pipe leakage online diagnosis device according to claim 1, characterized in that: the intelligent diagnosis system (21) comprises a data acquisition module and a PLC (programmable logic controller) connected with the data acquisition module, wherein the data acquisition module is connected with a conductivity meter (19), and the PLC is connected with an electromagnetic valve of each sampling pipeline to control the opening and closing of the electromagnetic valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332468A (en) * | 2019-07-30 | 2019-10-15 | 西安热工研究院有限公司 | A kind of thermal power plant unit heat exchanger tube leakage on-line diagnosing apparatus and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332468A (en) * | 2019-07-30 | 2019-10-15 | 西安热工研究院有限公司 | A kind of thermal power plant unit heat exchanger tube leakage on-line diagnosing apparatus and method |
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