CN216412297U - Leakage detection alarm device for low-temperature economizer of thermal power plant - Google Patents
Leakage detection alarm device for low-temperature economizer of thermal power plant Download PDFInfo
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- CN216412297U CN216412297U CN202122162271.5U CN202122162271U CN216412297U CN 216412297 U CN216412297 U CN 216412297U CN 202122162271 U CN202122162271 U CN 202122162271U CN 216412297 U CN216412297 U CN 216412297U
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- temperature economizer
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Abstract
The utility model discloses a leakage detection alarm device for a low-temperature economizer of a thermal power plant, which relates to the technical field of power equipment and comprises two positive and negative metal probes, wherein the probes are arranged at the bottom of a low-temperature economizer module and externally connected with a lead wire into a leakage detection control cabinet for the low-temperature economizer, the control cabinet comprises a power supply, one end of the power supply is connected with a shunt air switch, the shunt air switch controls a loop according to the current, the other end of the shunt air switch is connected with a plurality of branches of the low-temperature economizer module, one side of each branch, which is close to the shunt air switch, is connected with a current transmitter, the other end of each current transmitter is connected with a dust resistor, and the other end of each dust resistor is connected with a main switch; the structure is simple, the occupied area is small, and the installation and maintenance cost is low; the defect of the existing low-temperature economizer leakage detection technology is overcome, and the leakage detection level of the low-temperature economizer is improved.
Description
Technical Field
The utility model relates to the technical field of power equipment, in particular to a leakage detection alarm device for a low-temperature economizer of a thermal power plant.
Background
At present, in actual production, a low-temperature economizer of a boiler of a thermal power plant is generally arranged in front of electric precipitation, is washed by a large amount of fly ash during operation, is easy to leak after long-time operation, and if the leakage is not found to affect the safe operation of the electric precipitation timely and seriously, the leakage alarm of the low-temperature economizer at present judges whether the leakage occurs or not through the difference of inlet and outlet flow, but the alarm is not sensitive, the leakage is found by in-situ inspection every time, but the alarm is still not sent by DCS, and the unreliability and the hysteresis are higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a leakage detection alarm device for a low-temperature economizer of a thermal power plant, so as to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
a leakage detection alarm device for a low-temperature economizer of a thermal power plant comprises two positive and negative metal probes, wherein the probes are arranged at the bottom of a low-temperature economizer module and externally connected with a lead wire to a leakage detection control cabinet of the low-temperature economizer, the control cabinet comprises a power supply, one end of the power supply is connected with a shunt air switch, the shunt air switch controls a loop according to the current, the other end of the branch air switch is connected with a plurality of low-temperature economizer module branches, one side of each branch, which is close to the branch air switch, is connected with a current transmitter, the other end of the current transducer is connected with a gray resistor, the other end of the gray resistor is connected with a main switch, the one end connection pilot lamp that grey resistance was kept away from to master switch, the pilot lamp passes through the fuse and is connected with the power, current transmitter is connected with the controller, the controller is connected with control room DCS.
Preferably, the power supply is a direct current 24V power supply.
Preferably, the control room DCS is connected to an alarm for sending an alarm signal to the alarm.
Preferably, the alarm is a buzzer.
Compared with the prior art, the utility model has the beneficial effects that:
1) the low-temperature economizer is used for heat exchange of flue gas to water, if water flows into a flue of the low-temperature economizer after leakage of the low-temperature economizer, the water is deposited to the bottom and can be judged whether leakage is found or not by detecting the change of conductivity of bottom grey water, when the leakage of the low-temperature economizer occurs, the conductivity of the bottom grey water changes, so that a conducting circuit gives an alarm to a unit DCS, in normal operation, a shunt air switch 1-3 is in a closing state, when the loop current is too large, the air switch 1-3 trips, a fuse is fused to protect the loop when the air switch 1-3 cannot trip, a current transmitter automatically judges whether leakage is found or not through a current sensor according to the measured actual current, the PLC automatically judges whether leakage is found according to a set value, and finally transmits information to a control room DCS, the low-temperature economizer does not leak in normal operation, and a leakage circuit loop is detected to be in an open circuit state, once the low-temperature economizer leaks, the detection circuit is conducted to transmit a current signal to the unit DCS to send an alarm, so that the early leakage of the low-temperature economizer is found in time;
2) the structure is simple, the occupied area is small, and the installation and maintenance cost is low;
3) the defect of the existing low-temperature economizer leakage detection technology is overcome, and the leakage detection level of the low-temperature economizer is improved;
4) the four low-temperature economizer modules share one detection loop, the arrangement is compact, maintenance and installation are facilitated, and the installation cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a leakage detection alarm device for a low-temperature economizer of a thermal power plant.
Fig. 2 is a schematic structural diagram of a low-temperature economizer module in the leakage detection alarm device for the low-temperature economizer of the thermal power plant.
In the figure: 1-1: a gray resistance; 1-2: a current transmitter; 1-3: a shunt air switch; 1-4: a direct current power supply; 1-5: a fuse; 1-6: a master switch; 1-7: and an indicator light.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-2, a leakage detection alarm device for a low-temperature economizer of a thermal power plant comprises two positive and negative metal probes, wherein the probes are arranged at the bottom of a low-temperature economizer module and externally connected with a lead wire into a leakage detection control cabinet of the low-temperature economizer, the control cabinet comprises a power supply 1-4, one end of the power supply 1-4 is connected with a shunt air switch 1-3, the shunt air switch 1-3 controls a loop according to the current magnitude, the other end of the shunt air switch 1-3 is connected with a plurality of branches of the low-temperature economizer module, one side of each branch close to the shunt air switch 1-3 is connected with a current transmitter 1-2, the other end of the current transmitter 1-2 is connected with an ash resistor 1-1, the other end of the ash resistor 1-1 is connected with a main switch 1-6, one end of the main switch 1-6, which is far away from the gray resistor 1-1, is connected with an indicator lamp 1-7, the indicator lamp 1-7 is connected with a power supply 1-4 through a fuse 1-5, the current transmitter is connected with a controller, and the controller is connected with a control room DCS;
specifically, in this embodiment, the low-temperature economizer is a heat exchange device of flue gas to water, if the water flows into a flue of the low-temperature economizer after leakage, the water is deposited to the bottom and can be used for judging whether leakage is found or not by detecting the conductive change of bottom grey water, when the leakage occurs in the low-temperature economizer, the conductivity of the bottom grey water is changed, so that a conducting circuit sends an alarm to a set DCS, in normal operation, a shunt air switch 1-3 is in a closing state, when a loop current is too large, the air switch 1-3 is tripped, and when the air switch 1-3 cannot be tripped, a fuse is fused to protect the loop, a current transmitter is led to a PLC module through a current sensor according to the measured actual current, the PLC automatically judges whether leakage is found according to a set value, and finally information is transmitted to a control room DCS, and no leakage exists in the normal operation of the low-temperature economizer, and once the leakage of the low-temperature economizer occurs, the detection circuit is conducted to transmit a current signal to the unit DCS to give an alarm, so that the early leakage of the low-temperature economizer is found in time.
Specifically, the distance between two positive and negative metal probes is L, the distance between the probes on two sides and the bottom end of the low-temperature economizer module is H, and the resistance value of the ash resistor 1-1 is adjusted by adjusting the distance between the two positive and negative metal probes or the height between the probes and the bottom end of the low-temperature economizer module.
As a further scheme of the embodiment of the utility model, the power supplies 1-4 are direct current 24V power supplies.
As a further scheme of the embodiment of the utility model, the control room DCS is connected with the alarm and used for sending an alarm signal to the alarm.
As a further scheme of the embodiment of the utility model, the alarm is a buzzer.
The working principle of the utility model is as follows: the low-temperature economizer is used for heat exchange of flue gas to water, if water flows into a flue of the low-temperature economizer after leakage of the low-temperature economizer, the water is deposited to the bottom and can be judged whether leakage is found or not by detecting the change of conductivity of bottom grey water, when the leakage of the low-temperature economizer occurs, the conductivity of the bottom grey water changes, so that a conducting circuit gives an alarm to a unit DCS, in normal operation, a shunt air switch 1-3 is in a closing state, when the loop current is too large, the air switch 1-3 trips, a fuse is fused to protect the loop when the air switch 1-3 cannot trip, a current transmitter automatically judges whether leakage is found or not through a current sensor according to the measured actual current, the PLC automatically judges whether leakage is found according to a set value, and finally transmits information to a control room DCS, the low-temperature economizer does not leak in normal operation, and a leakage circuit loop is detected to be in an open circuit state, once the low-temperature economizer generates leakage, the detection circuit is conducted to transmit a current signal to the unit DCS to send out an alarm.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (4)
1. A leakage detection alarm device for a low-temperature economizer of a thermal power plant comprises two positive and negative metal probes, and is characterized in that the probes are arranged at the bottom of a low-temperature economizer module and externally connected with a lead wire to a leakage detection control cabinet of the low-temperature economizer;
the control cabinet comprises a power supply, one end of the power supply is connected with a shunt air switch, the shunt air switch controls a loop according to the current, the other end of the shunt air switch is connected with a plurality of low-temperature economizer module branches, one side of each branch, which is close to the shunt air switch, is connected with a current transmitter, the other end of each current transmitter is connected with a dust resistor, the other end of each dust resistor is connected with a main switch, one end, which is far away from the dust resistor, of the main switch is connected with an indicator lamp, and the indicator lamp is connected with the power supply through a fuse;
the current transmitter is connected with the controller, and the controller is connected with the control room DCS.
2. The leakage detection and alarm device for the low-temperature economizer of the thermal power plant as claimed in claim 1, wherein the power supply is a direct current 24V power supply.
3. The leakage detection and alarm device for the low-temperature economizer of the thermal power plant as claimed in claim 1 or 2, wherein the control room DCS is connected with the alarm for sending an alarm signal to the alarm.
4. The leakage detection alarm device for the low-temperature economizer of the thermal power plant as claimed in claim 3, wherein the alarm is a buzzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122162271.5U CN216412297U (en) | 2021-09-08 | 2021-09-08 | Leakage detection alarm device for low-temperature economizer of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122162271.5U CN216412297U (en) | 2021-09-08 | 2021-09-08 | Leakage detection alarm device for low-temperature economizer of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
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| CN216412297U true CN216412297U (en) | 2022-04-29 |
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| CN202122162271.5U Active CN216412297U (en) | 2021-09-08 | 2021-09-08 | Leakage detection alarm device for low-temperature economizer of thermal power plant |
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2021
- 2021-09-08 CN CN202122162271.5U patent/CN216412297U/en active Active
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