CN211820035U - DCS monitoring system for abnormal state of large-scale contact fan of thermal power plant - Google Patents
DCS monitoring system for abnormal state of large-scale contact fan of thermal power plant Download PDFInfo
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- CN211820035U CN211820035U CN202020447010.0U CN202020447010U CN211820035U CN 211820035 U CN211820035 U CN 211820035U CN 202020447010 U CN202020447010 U CN 202020447010U CN 211820035 U CN211820035 U CN 211820035U
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Abstract
The utility model provides a DCS monitoring system for abnormal states of large-scale contact fans of a thermal power plant; the monitoring system comprises a monitoring module, a control module, a storage module and an alarm module; the utility model can timely judge the abnormal condition that the fan does not trip when the fan suddenly loses force during operation; the warning when the fan is abnormal reminds, and the output instruction is connected with the main pipe contact door of the fan, so that the wind of the other fan is prevented from being discharged from the side of the fault fan. The boiler is prevented from flameout due to sudden drop of the air pressure, so that operators can find fault points at the first time and timely process the fault points, and non-stop is avoided.
Description
Technical Field
The utility model relates to a large-scale contact fan abnormal state DCS monitoring system of thermal power plant.
Background
The existing fans are connected in parallel for supplying sufficient oxygen for two days often, a connection door is added on a connection pipeline to cut off the connection state, a bearing of a feedback device of a hydraulic cylinder adjusting mechanism of one fan is damaged, so that a movable blade slides down to be completely closed, the outlet baffle of the primary fan is not closed because the primary fan is not tripped, primary air is exhausted after passing through the connection door and the outlet baffle, primary air pressure drops sharply, boiler combustion deteriorates, and flameout and tripping is caused.
SUMMERY OF THE UTILITY MODEL
In order to identify the special fault state that the fan in operation does not trip but loses power in time, the reliability of the operation of the thermal power generating unit is improved. The utility model provides a large-scale contact fan abnormal state DCS monitoring system of thermal power plant.
The utility model discloses a following technical scheme can realize.
The utility model provides a DCS monitoring system for abnormal state of large-scale contact fans of thermal power plants; the monitoring system comprises a monitoring module, a control module, a storage module and an alarm module;
the monitoring module comprises a fan running state monitoring unit, a fan current monitoring unit, a fan main pipe pressure monitoring unit and a fan outlet pressure monitoring unit;
the fan running state monitoring unit monitors the running states of the two fans;
the fan current monitoring unit monitors the current value when the guide vanes of the two fans are fully closed;
the fan main pipe pressure monitoring unit monitors pressure values of two fan main pipes;
and the fan outlet pressure monitoring unit monitors the outlet pressure value when the guide vanes of the two fans are closed.
The alarm module gives an alarm and closes the contact door when the monitored data of the fan running state monitoring unit, the fan current monitoring unit, the fan main pipe pressure monitoring unit and the fan outlet pressure monitoring unit are abnormal.
The current value is abnormal, namely the current value is 1A when the current of any fan is smaller than the full-closed guide vane in the fan test.
The pressure value of the main pipe is abnormal, namely the pressure value of the main pipe of the fan is lower than the pressure value of the main pipe of the fan, the normal operation of one fan is realized, and when the guide vane of the other fan is completely closed, the pressure of the main pipe of the fan is 2 Pa.
And the abnormal outlet pressure value is 3Pa of the outlet pressure value of the fan when the outlet pressure value of any one fan is lower than the full closing of the guide vane of one fan and the other fan normally operates.
The current value is abnormal, the pressure value of the main pipe is abnormal, and the abnormal fixed value of the outlet pressure value can be adjusted according to the actual operation condition.
The beneficial effects of the utility model reside in that: the abnormal condition that the fan does not trip when the output force of the fan is suddenly lost in the operation process can be judged in time; the warning when the fan is abnormal reminds, and the output instruction is connected with the main pipe contact door of the fan, so that the wind of the other fan is prevented from being discharged from the side of the fault fan. The boiler is prevented from flameout due to sudden drop of the air pressure, so that operators can find fault points at the first time and timely process the fault points, and non-stop is avoided.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a control logic diagram of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A DCS monitoring system for abnormal states of large-scale contact fans of a thermal power plant; can carry out audible and visual alarm at the DCS picture when discerning the fan trouble, the female pipe contact door of fan is closed even to the output instruction simultaneously, prevents that the wind of another fan from discharging from trouble fan side. The boiler is prevented from flameout due to sudden drop of the air pressure, so that operators can find fault points at the first time and timely process the fault points, and non-stop is avoided.
The monitoring system comprises a monitoring module, a control module, a storage module and an alarm module;
the monitoring module comprises a fan running state monitoring unit, a fan current monitoring unit, a fan main pipe pressure monitoring unit and a fan outlet pressure monitoring unit;
the fan running state monitoring unit monitors the running states of the two fans;
the fan current monitoring unit monitors the current value when the guide vanes of the two fans are fully closed;
the fan main pipe pressure monitoring unit monitors pressure values of two fan main pipes;
and the fan outlet pressure monitoring unit monitors the outlet pressure value when the guide vanes of the two fans are closed.
The alarm module gives an alarm and closes the contact door when the monitored data of the fan running state monitoring unit, the fan current monitoring unit, the fan main pipe pressure monitoring unit and the fan outlet pressure monitoring unit are abnormal.
The current value is abnormal, namely the current value is 1A when the current of any fan is smaller than the full-closed guide vane in the fan test.
The pressure value of the main pipe is abnormal, namely the pressure value of the main pipe of the fan is lower than the pressure value of the main pipe of the fan, the normal operation of one fan is realized, and when the guide vane of the other fan is completely closed, the pressure of the main pipe of the fan is 2 Pa.
And the abnormal outlet pressure value is 3Pa of the outlet pressure value of the fan when the outlet pressure value of any one fan is lower than the full closing of the guide vane of one fan and the other fan normally operates.
The current value is abnormal, the pressure value of the main pipe is abnormal, and the abnormal fixed value of the outlet pressure value can be adjusted according to the actual operation condition.
Fig. 2 is the control logic of the present invention, the logic for judging the abnormal state of the fan is as follows: phase of conditioned
1. Two fans are operated;
2. the current of the fan is lower than a fixed value 1;
3. the pressure of the wind outlet main pipe is lower than a fixed value 2 (2 is taken as 3);
4. the outlet pressure of the primary air fan is lower than a fixed value 3;
in the figure, the customization adjustments are: the fixed value is 1: the current value of the guide vane when the guide vane is fully closed in the fan test; the fixed value is 2: when one fan normally operates and the guide vane of the other fan is fully closed, the pressure of a main pipe of the fan is increased; the fixed value is 3: when one fan guide vane is completely closed and the other fan runs normally, the guide vane is closed to obtain the fan outlet pressure value.
Claims (5)
1. The utility model provides a large-scale contact fan abnormal state DCS monitoring system of thermal power plant which characterized in that: the monitoring system comprises a monitoring module, a control module, a storage module and an alarm module;
the monitoring module comprises a fan running state monitoring unit, a fan current monitoring unit, a fan main pipe pressure monitoring unit and a fan outlet pressure monitoring unit;
the fan running state monitoring unit monitors the running states of the two fans;
the fan current monitoring unit monitors the current value when the guide vanes of the two fans are fully closed;
the fan main pipe pressure monitoring unit monitors pressure values of two fan main pipes;
and the fan outlet pressure monitoring unit monitors the outlet pressure value when the guide vanes of the two fans are closed.
2. The DCS monitoring system for the abnormal state of the large-scale connecting fan of the thermal power plant as claimed in claim 1, wherein: the alarm module gives an alarm and closes the contact door when the monitored data of the fan running state monitoring unit, the fan current monitoring unit, the fan main pipe pressure monitoring unit and the fan outlet pressure monitoring unit are abnormal.
3. The DCS monitoring system for the abnormal state of the large-scale connecting fan of the thermal power plant as claimed in claim 2, wherein: the current value is abnormal, namely the current value is 1A when the current of any fan is smaller than the full-closed guide vane in the fan test.
4. The DCS monitoring system for the abnormal state of the large-scale connecting fan of the thermal power plant as claimed in claim 2, wherein: the pressure value of the main pipe is abnormal, namely the pressure value of the main pipe of the fan is lower than the pressure value of the main pipe of the fan, the normal operation of one fan is realized, and when the guide vane of the other fan is completely closed, the pressure of the main pipe of the fan is 2 Pa.
5. The DCS monitoring system for the abnormal state of the large-scale connecting fan of the thermal power plant as claimed in claim 2, wherein: and the abnormal outlet pressure value is 3Pa of the outlet pressure value of the fan when the outlet pressure value of any one fan is lower than the full closing of the guide vane of one fan and the other fan normally operates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020447010.0U CN211820035U (en) | 2020-03-31 | 2020-03-31 | DCS monitoring system for abnormal state of large-scale contact fan of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020447010.0U CN211820035U (en) | 2020-03-31 | 2020-03-31 | DCS monitoring system for abnormal state of large-scale contact fan of thermal power plant |
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| CN211820035U true CN211820035U (en) | 2020-10-30 |
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| CN202020447010.0U Active CN211820035U (en) | 2020-03-31 | 2020-03-31 | DCS monitoring system for abnormal state of large-scale contact fan of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153793A (en) * | 2021-03-18 | 2021-07-23 | 华能(广东)能源开发有限公司海门电厂 | Primary air fan and fan hydraulic cylinder fault automatic detection and emergency processing system |
-
2020
- 2020-03-31 CN CN202020447010.0U patent/CN211820035U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153793A (en) * | 2021-03-18 | 2021-07-23 | 华能(广东)能源开发有限公司海门电厂 | Primary air fan and fan hydraulic cylinder fault automatic detection and emergency processing system |
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