CN216559683U - Coal burner air door pull rod fault monitoring device - Google Patents
Coal burner air door pull rod fault monitoring device Download PDFInfo
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- CN216559683U CN216559683U CN202123124921.3U CN202123124921U CN216559683U CN 216559683 U CN216559683 U CN 216559683U CN 202123124921 U CN202123124921 U CN 202123124921U CN 216559683 U CN216559683 U CN 216559683U
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Abstract
The utility model discloses a coal burner air door pull rod fault monitoring device. The utility model comprises a tension sensor, an air door pull rod, an air door air adjusting disc, an electric actuating mechanism, a tension signal wire, a current sensor, a control system, an air box and an air box wall. The tension sensor connected with the air door connecting rod is used for detecting the tension change of the connecting rod in real time when the electric actuating mechanism acts, meanwhile, the current sensor is used for detecting the change of the current value of the electric actuating mechanism, and the fracture fault of the air door pull rod is diagnosed in real time by using the current value, the tension value and the mutual relation of the current value and the tension value, and meanwhile, the jamming fault of an air door system can be diagnosed and the jamming position can be determined. The utility model does not need to stop the furnace and enter the air box to check the condition of the air door connecting rod, diagnoses the health state of the air door system in real time during operation, and effectively improves the reliability of the operation of the equipment.
Description
Technical Field
The utility model belongs to the technical field of equipment fault monitoring of coal-fired power plants, and relates to a coal burner air door pull rod fault monitoring device.
Background
The swirl pulverized coal burner is one of the main flow types of the boiler pulverized coal burner, and the performance of the burner has obvious influence on the stability, economy, safety and pollutant discharge of combustion. The control of the damper plays a decisive role in the performance of the burner: the fuel and air required by combustion are fed into a hearth by controlling the air quantity, and a good aerodynamic field is formed in the furnace, so that the fuel can quickly and stably catch fire; air can be supplied in time to be mixed with fuel in time so as to ensure that the fuel can be completely combusted in the furnace; the coal type and load requirements are met, and the coal type and load regulation device has good regulation performance and a large regulation range; and controlling the NOx generation amount within an environment-friendly allowable range. The coal powder in the hearth is continuously and stably ignited, intensively combusted and fully combusted without the air distribution and adjustment of primary air and secondary air, so the control accuracy of the air door is the basic requirement of the coal powder combustion of the power plant boiler.
In order to ensure good performance of daily combustion of the boiler, normal operation of an air door adjusting system of the pulverized coal burner is a necessary prerequisite. However, during the daily operation of the unit, each burner damper is in a hot, dusty environment. Meanwhile, when the air quantity demand is large, the vibration of the air pipe is possibly aggravated, and along with the accumulation of time, faults such as aging, mechanical jamming and pull rod breakage can occur to certain parts of the air door actuating mechanism which is in a severe environment for a long time, especially, the faults are difficult to find in the first time if the parts such as the pull rod are positioned in the air box. If the air door fault of the pulverized coal burner cannot be timely checked and processed, the combustion state and the emission in the boiler can be directly influenced, the requirements of an environmental protection department on real-time online supervision of the emission of a power plant cannot be met, even the shutdown maintenance is needed, and the economic benefit of the power plant is influenced to a certain extent. For example: in a 1050MW front-rear wall opposed firing unit, problems of slag bonding in a furnace, overheating of the wall temperature of a heating surface, serious deviation of steam temperatures on two sides and the like exist for a long time, so that the load carrying capacity and the load changing capacity are reduced, the problems can not be solved through thermal state adjustment, and the secondary air door connecting rod of one combustor is found to be broken through a furnace shutdown and cold state test, so that the secondary air door is in a closed state.
The current pulverized coal burner air door adjusting system only has a basic function of controlling the opening degree of an air door, the opening degree value of the air door is only fed back through the state of an external actuating mechanism, and the current pulverized coal burner air door adjusting system does not have a fault monitoring and diagnosing function and condition. Therefore, the development of the coal burner air door pull rod fault monitoring device and method has important practical significance and application value.
Disclosure of Invention
The purpose of the utility model is: in order to prevent the operation safety risk and economic loss of a power plant caused by the failure of the air door of the burner, a coal powder burner air door pull rod failure monitoring device is provided. Whether effective action has been carried out at the operation in-process to the air door pull rod through the device can be monitored, whether judge combustor air door pull rod and be in the card and die or the fracture state, find in time whether coal burner air door pull rod breaks down, avoided because of the power plant economic benefits loss that this trouble brought.
The basic principle of the utility model is as follows: in order to find out the fault caused by the air door actuating mechanism in time, the actual working state of the air door pull rod is monitored in real time by combining the air door pull rod with the tension sensor technology and combining a method of mutual fault tolerance of the tension change of the connecting rod and the current change of the actuating mechanism.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model comprises a tension sensor, an air door pull rod, an air door air adjusting disc, an electric actuating mechanism, a tension signal wire, a current sensor, a control system and an air box;
the tension sensor adopts an S-shaped tension sensor and is respectively connected with the air door pull rod and the air door air adjusting disc through internal thread holes at two ends; and in the high-temperature environment in the bellows, a tension sensor with high temperature resistance of more than 350 ℃ needs to be selected;
the air door pull rod is a stainless steel pipe with an external thread interface at one end, the external thread interface is used for being connected with the tension sensor, and the other end of the air door pull rod is connected with the electric actuating mechanism;
the tension signal wire outputs a tension signal of the tension sensor to the control system, and the tension sensor is arranged between the air door pull rod and the air door air adjusting disc, so that the tension signal wire has the performance of resisting high temperature of over 330 ℃ and is arranged in the anti-abrasion sleeve;
the current sensor is used for detecting the current of the electric actuator during operation.
Further, if the tension sensor can not meet the requirement of high temperature resistance, a conventional tension sensor is selected, and the conventional tension sensor needs to be arranged between an air door pull rod outside the air box and the electric actuating mechanism.
Further, if the tension sensor is arranged outside the air box, the air door pull rod is connected with the air door air adjusting disc, and the air door pull rod is connected with the electric actuating mechanism through the conventional tension sensor.
Furthermore, the air adjusting disc of the air door is an existing air volume adjusting device of the combustor. The electric actuating mechanism is an existing device.
Further, when the air door of the combustor adopts a pneumatic actuator, a current sensor does not need to be arranged.
The fault detection method of the device is realized as follows:
a tension signal of the tension sensor and a current signal of the electric actuating mechanism enter the DCS and collect data in real time, and the DCS diagnoses the action condition of the air door pull rod according to the changes of the tension signal and the current signal; establishing normal value ranges of tension and current under the condition of determining that the action of the combustor is normal;
(1) when the current is zero, no diagnosis is performed;
(2) when the current value is smaller than or equal to the normal value range, if the tension value is within the normal value range, the air door pull rod is normal, and if the tension value is smaller than the lower limit of the normal value, the possibility that the pull rod is broken is shown;
(3) when the current value is larger than the normal value range and the tension sensor is arranged in the air box, if the tension value is smaller than or equal to the normal value range, the possibility of jamming between the air door pull rod and the air box wall is shown, and if the tension value is larger than the normal value range, the possibility of jamming between the air door air adjusting disc is shown; when the current value is larger than the normal value range and the tension sensor is arranged outside the air box, if the tension value is larger than the normal value range, the possibility that the air door pull rod, the air box wall and the air door air adjusting disc are jammed is indicated;
(4) if the pneumatic actuator is adopted, judging whether the air door acts according to the change of the opening degree of the actuator; if the tension value is smaller than the normal value range when the air door is in motion, the possibility of breakage of the air door pull rod is indicated.
The tension sensor is arranged between the air door pull rod and the air door air adjusting disc, so that the execution traction force of the air door air adjusting disc can be detected and diagnosed more effectively, and misdiagnosis caused by possible jamming of the air door pull rod and the bellows wall is avoided. If the tension sensor is insufficient in high temperature resistance and dustproof capacity, the tension sensor can also be installed at the connecting end of the air door pull rod outside the air box and the electric actuating mechanism, the fracture fault of the air door pull rod can be diagnosed at the moment, and the specific position of the air door adjusting system is difficult to distinguish if the air door adjusting system is jammed.
The tension sensor can also adopt other structural forms which are convenient to install and use, and the connection mode of the tension sensor and other components can be adjusted correspondingly.
Compared with the existing combustor air door connecting rod, the utility model has the following beneficial effects:
the utility model adds a tension sensor, and utilizes the tension sensor connected with the air door connecting rod to detect the tension change of the connecting rod in real time when the electric actuating mechanism acts, and simultaneously utilizes the current sensor to detect the current value change of the electric actuating mechanism, and utilizes the current value, the tension value and the mutual relation thereof to diagnose the breakage fault of the air door pull rod in real time, and simultaneously can diagnose the jamming fault of the air door system. The utility model does not need to stop the furnace and enter the air box to check the condition of the air door connecting rod, diagnoses whether the air door connecting rod has a fault or not in real time during operation through the tension value of the air door pull rod and the current value of the electric actuating mechanism, can diagnose the jamming fault of the equipment at the same time, and effectively improves the reliability of the operation of the equipment.
Drawings
Fig. 1 is a schematic overall structural diagram of a coal burner air door tie rod fault monitoring device provided by the utility model.
In the figure, a tension sensor 1, a throttle pull rod 2, a throttle adjusting disc 3, an electric actuator 4, a tension signal wire 5, a current sensor 6, a control system 7, an air bellow 8 and an air bellow 9 are arranged.
Detailed Description
The following detailed description of the embodiments of the utility model refers to the accompanying drawings.
As shown in FIG. 1, the device for monitoring the fault of the air door pull rod of the pulverized coal burner comprises a tension sensor 1, an air door pull rod 2, an air door air adjusting disc 3, an electric actuator 4, a tension signal wire 5, a current sensor 6, a control system 7, an air box 8 and an air box wall 9.
The tension sensor 1 is an S-shaped tension sensor and is respectively connected with the air door pull rod 2 and the air door air adjusting disc 3 through internal thread holes at two ends. The tension sensor 1 is in a high-temperature and high-dust environment with the temperature of above 330 ℃, and a high-temperature resistant and dustproof tension sensor is required. If the tension sensor 1 has insufficient high temperature resistance and dust prevention capability, the tension sensor can also be arranged between the air door pull rod 2 and the electric actuating mechanism 4 outside the air box.
The tension sensor 1 can also adopt other structural forms which are convenient to install and use, and the connection mode of the tension sensor 1 and other components can be adjusted correspondingly.
The air door pull rod 2 is made of a stainless steel pipe with an external thread interface at one end, the external thread interface is used for being connected with the tension sensor 1, and the other end of the external thread interface is connected with the electric actuating mechanism 4. If the tension sensor 1 is arranged outside the bellows 8, the damper lever 2 is connected to the damper register 3. The connection mode of the air door pull rod 2 and the electric actuator 4 or the air door air adjusting disc 3 can be designed according to requirements.
The tension signal wire 5 outputs the tension signal of the tension sensor to the control system 7, and if the tension sensor 1 is arranged between the air door pull rod 2 and the air door air adjusting disc 3, the tension signal wire 5 has the performance of resisting high temperature of over 330 ℃ and is arranged in the anti-abrasion sleeve.
The current sensor 6 is installed on a power line of the electric actuator 4 and used for detecting current when the electric actuator 4 operates, and generally adopts a current transformer, and can also adopt other types of sensors meeting current detection requirements. If a pneumatic actuator is used for the burner damper, the current sensor 6 need not be arranged.
The control system is an existing control system, such as a power plant DCS system and the like.
The wind box is an existing part of the boiler.
The bellows wall is the outer wall of the bellows.
The air adjusting plate of the air door is the existing air adjusting device of the combustor, the air adjusting modes of the combustors of different models can be different, for example, sleeve air doors and the like are adopted, but the transmission modes are basically the same, and the utility model is also applicable.
And a sensor signal output line is arranged in the middle of the tension sensor and used for converting the force signal into an electric signal and outputting the electric signal to the DCS control system.
A fault detection implementation method of a coal burner air door pull rod fault monitoring device is specifically implemented as follows:
the method comprises the steps of collecting a tension signal of a tension sensor and a current signal of an electric actuating mechanism in real time, transmitting the tension signal and the current signal into a DCS, and diagnosing the action condition of an air door pull rod by the DCS according to the changes of the tension signal and the current signal. Due to the possible differences in the processing and installation of different burners and the possible deformation of different burners after operation, the tension and current reference values of different burners may have certain differences.
And establishing normal value ranges of the pulling force and the current under the condition of determining that the combustor acts normally.
(1) When the current is zero, no diagnosis is performed.
(2) When the current value is smaller than or equal to the normal value range, if the tension value is within the normal value range, the air door pull rod is normal, and if the tension value is smaller than the lower limit of the normal value, the possibility that the pull rod is broken is indicated.
(3) When the current value is larger than the normal value range, the tension sensor is arranged in the air box, if the tension value is smaller than or equal to the normal value range, the possibility that the air door pull rod is blocked with the air box wall is shown, and if the tension value is larger than the normal value range, the possibility that the air door air adjusting disc is blocked is shown. When the current value is larger than the normal value range, the tension sensor is arranged outside the air box, and if the tension value is larger than the normal value range, the possibility that the air door pull rod, the air box wall and the air door air adjusting disc are jammed is indicated.
If a pneumatic actuator is used (the same applies to an electric actuator if a current sensor is not provided), it is determined whether or not the damper is operating based on a change in the opening degree of the actuator. If the tension value is smaller than the normal value range when the air door is in motion, the possibility of breakage of the air door pull rod is indicated.
The device and the method for monitoring the faults of the air door pull rod of the pulverized coal burner are characterized in that a tension monitoring device is added on the basis of the original air door pull rod of the burner of a coal-fired power plant, the actual working state of the air door pull rod in the operation process is monitored by a method of mutual fault tolerance of tension variation of a tension sensor and current variation of an actuating mechanism, and a worker can judge whether the air door pull rod has faults or not only by monitoring the stress condition of the air door pull rod in real time on a control system. The device effectively relieves the fussy process of fault diagnosis and avoids the safety problem or economic loss of the coal-fired power plant caused by untimely fault finding of the air door.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A coal burner air door pull rod fault monitoring device is characterized by comprising a tension sensor, an air door pull rod, an air door air adjusting disc, an electric actuating mechanism, a tension signal wire, a current sensor, a control system and an air box;
the tension sensor adopts an S-shaped tension sensor and is respectively connected with the air door pull rod and the air door air adjusting disc through internal thread holes at two ends; and in the high-temperature environment in the bellows, a tension sensor with high temperature resistance of more than 350 ℃ needs to be selected;
the air door pull rod is a stainless steel pipe with an external thread interface at one end, the external thread interface is used for being connected with the tension sensor, and the other end of the air door pull rod is connected with the electric actuating mechanism;
the tension signal wire outputs a tension signal of the tension sensor to the control system, and the tension sensor is arranged between the air door pull rod and the air door air adjusting disc, so that the tension signal wire has the performance of resisting high temperature of over 330 ℃ and is arranged in the anti-abrasion sleeve;
the current sensor is used for detecting the current of the electric actuator during operation.
2. The pulverized coal burner air door pull rod fault monitoring device as claimed in claim 1, wherein if the tension sensor cannot meet the high temperature resistance requirement, a conventional tension sensor is selected, and at the moment, the conventional tension sensor needs to be arranged between an air door pull rod outside the air box and the electric actuator.
3. The pulverized coal burner damper pull rod fault monitoring device as claimed in claim 2, wherein if the tension sensor is arranged outside the wind box, the damper pull rod is connected with the damper wind adjusting disc, and the damper pull rod is connected with the electric actuator through a conventional tension sensor.
4. The pulverized coal burner damper pull rod fault monitoring device as claimed in claim 3, wherein the damper disk is an existing burner air volume adjusting device.
5. The pulverized coal burner damper pull rod fault monitoring device as claimed in claim 3, wherein when a pneumatic actuator is adopted for the burner damper, no current sensor is required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123124921.3U CN216559683U (en) | 2021-12-13 | 2021-12-13 | Coal burner air door pull rod fault monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123124921.3U CN216559683U (en) | 2021-12-13 | 2021-12-13 | Coal burner air door pull rod fault monitoring device |
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| Publication Number | Publication Date |
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| CN216559683U true CN216559683U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123124921.3U Active CN216559683U (en) | 2021-12-13 | 2021-12-13 | Coal burner air door pull rod fault monitoring device |
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| CN (1) | CN216559683U (en) |
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- 2021-12-13 CN CN202123124921.3U patent/CN216559683U/en active Active
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