CN115333045A - Control device and method for eliminating protection refusal of primary fan of thermal power generating unit - Google Patents
Control device and method for eliminating protection refusal of primary fan of thermal power generating unit Download PDFInfo
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- CN115333045A CN115333045A CN202210840632.3A CN202210840632A CN115333045A CN 115333045 A CN115333045 A CN 115333045A CN 202210840632 A CN202210840632 A CN 202210840632A CN 115333045 A CN115333045 A CN 115333045A
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- 239000003245 coal Substances 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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Abstract
The invention provides a control device and a control method for eliminating protection refusal of a primary fan of a thermal power generating unit, relating to the related technical field of thermal power generation.A primary fan protection shutdown condition SPPRO module is formed by inputting 6 kilovolt low-voltage protection or main fuel trip MFT hard wire loop on the left side of a basic driving level of a motor; the method comprises the steps that a shutdown instruction module is arranged, the shutdown instruction module is connected with a STOP port on the right side of a basic driving stage of a motor, a trigger signal of a SPPRO module under a primary fan protection shutdown condition is received through the STOP port, and the shutdown instruction module comprises a frequency converter shutdown port and a jump 6KV switch port; the output ports of the frequency conversion mode and the power frequency mode are added on the left side of the driving stage, and the shutdown instruction and the frequency conversion mode and the power frequency mode are respectively output to the stop port of the frequency converter and the jump 6KV switch port, so that the technical problems of ensuring the reliability of the protection logic device and preventing the protection misoperation and the operation failure of the main auxiliary machine are solved.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a control device and method for eliminating protection refusal of a primary fan of a thermal power generating unit.
Background
The large-scale thermal power generating unit with the installed capacity of 300MW-1000MW is characterized in that two primary fans are conventionally configured to run in parallel and serve as important components of a boiler air-smoke system, outlet air of the primary fans is divided into two paths, one path of outlet air is heated by an air preheater to become hot primary air, the hot primary air is used for drying and ventilation of a coal mill, and ground coal powder is conveyed to a boiler hearth combustor; one path of the hot primary air is called cold primary air without heating, the cold primary air and the hot primary air are mixed at the inlet of the coal mill, the temperature of the inlet and the outlet of the coal mill is adjusted, and meanwhile, the hot primary air also provides ventilation force for the coal mill.
The working voltage of a conventional primary fan is 6 kilovolts, the primary fan belongs to high-energy-consumption equipment, most power generation enterprises transform a fan motor from power frequency to frequency conversion for energy conservation and consumption reduction, so that the energy consumption of the fan is reduced, the service power is saved, and the economical efficiency of a unit is improved. For the national double-carbon target of helping hand, the power generation proportion of green energy sources is greatly improved by a power system, the green energy sources such as wind energy and solar energy cannot work uninterruptedly and stably, and the safety and the continuity of a power grid can be guaranteed only by the flexible peak regulation cooperation of a thermal power generating unit. In the flexibility deep peak regulation process of the thermal power generating unit, a primary fan, a blower, a condensate pump and other main auxiliary machines are operated in a performance boundary area, the probability of protection outage is greatly improved, a frequency converter serves as an energy-saving element, and the possibility of faults exists when two modes of power frequency and frequency conversion are switched back and forth, and when the fan is started, stopped and protected.
In the prior art, after a main fuel of a thermal power generating unit trips an MFT, two primary fans which are in shutdown are protected, and a hard circuit is designed, and is connected to local equipment in parallel with a primary fan opening instruction from an MFT relay cabinet to a sequence control cabinet, so that the primary fan hard circuit trips. The operation of a primary fan is divided into a power frequency mode and a frequency conversion mode, and the primary fan of a certain thermal power generating unit operates in the frequency conversion mode for a long time, so that when the protection device is designed, an MFT action hard wire loop is connected in parallel to a primary fan frequency converter brake-separating instruction, after MFT action, the primary fan can be normally protected and stopped when operating in the frequency conversion mode, but the primary fan is mainly protected and refused to operate in the power frequency mode, the primary fan cannot be stopped and the overpressure of a boiler system is easily caused, and the great potential safety hazard exists.
Disclosure of Invention
The application provides a control device method and system for eliminating protection rejection of a primary air fan of a thermal power generating unit, which are used for solving the technical problems of ensuring the reliability of a protection logic device and preventing the misoperation and rejection of the protection of a main auxiliary machine, realizing the normal shutdown of the primary air fan under a frequency conversion mode and a power frequency mode, achieving the independent protection action of the frequency conversion mode and the power frequency mode, effectively eliminating the risk of the protection rejection of the primary air fan, and avoiding the occurrence of serious hidden dangers such as boiler overpressure and the like.
In view of the above problems, the application provides a control device and method for eliminating the protection and the operation rejection of a primary air fan of a thermal power generating unit.
In a first aspect, an embodiment of the present application provides a control device is refused in protection of a primary air fan of a thermal power generating unit, the device includes: a motor primary drive stage; the primary fan protection shutdown condition SPPRO module is connected with a left digital input port of the motor basic driving stage; the shutdown instruction module is connected with a STOP port on the right side of the basic driving stage of the motor and receives a trigger signal of the SPPRO module under the condition of the primary fan protection shutdown through the port of the basic driving stage of the motor, wherein the shutdown instruction module comprises a frequency converter STOP port and a jump 6KV switch port; the frequency conversion mode output port is connected with the frequency converter stop port; the power frequency mode output port is connected with the jump 6KV switch port; when the SPPRO module under the condition of the protection shutdown of the primary air fan is triggered, the shutdown instruction module outputs a shutdown instruction, the shutdown instruction is output to the frequency converter shutdown port in a frequency conversion mode, and the shutdown instruction is output to the jump 6KV switch port in a power frequency mode, so that protection action is realized.
In a second aspect, an embodiment of the present application provides a control method for eliminating protection rejection of a primary air fan of a thermal power generating unit, where the method includes: when 6kV low-voltage protection or main fuel tripping MFT is triggered, obtaining a primary fan operation mode; when the primary air fan is operated in a frequency conversion mode, the primary air fan is connected with an output port of the frequency conversion mode through a shutdown instruction, the primary air fan is output to a stop port of the frequency converter, and the protection operation is realized through the stop of the frequency converter; when the primary air fan is operated in a power frequency mode, the primary air fan is connected with the jump 6KV switch port through the outage instruction and is output to the jump 6KV switch port, and protection operation is achieved through the jump 6KV switch.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
according to the control device and method for eliminating the protection refusal of the primary air fan of the thermal power generating unit, a primary air fan protection shutdown condition SPPRO module is formed by inputting 6 kilovolt low voltage protection or main fuel trip MFT hard line loop to the left side of a basic driving level of a motor; setting a shutdown instruction module, wherein the shutdown instruction module is connected with a STOP port on the right side of the basic drive stage of the motor and receives a trigger signal of the primary fan protection shutdown condition SPPRO module through a port of the basic drive stage of the motor, and the shutdown instruction module comprises a frequency converter STOP port and a jump 6KV switch port; meanwhile, a frequency conversion mode output port and a power frequency mode output port are added on the left side of a basic driving stage of the motor, and the STOP outage instruction is respectively AND-output to a frequency converter STOP port and a jump 6KV switch port with the frequency conversion mode and the power frequency mode; when 6kV low-voltage protection or main fuel tripping MFT is triggered, a primary fan operation mode is obtained; when the primary air fan is operated in a frequency conversion mode, the primary air fan is connected with an output port of the frequency conversion mode through a shutdown instruction, the primary air fan is output to a stop port of the frequency converter, and the protection operation is realized through the stop of the frequency converter; when the operation mode of the primary air fan is in a power frequency mode, the primary air fan is connected with the jump 6KV switch port through the shutdown instruction and output to the jump 6KV switch port, and protection operation is achieved through the jump 6KV switch. The technical problems of ensuring the reliability of a protection logic device and preventing the main auxiliary engine from being mistakenly operated and refused to operate are solved, the primary fan can be normally stopped in a frequency conversion mode and a power frequency mode, independent protection actions of the frequency conversion mode and the power frequency mode are achieved, the risk of refusing operation of primary fan protection is effectively eliminated, and the technical effects of serious hidden dangers such as boiler overpressure and the like are avoided.
Drawings
Fig. 1 is a schematic structural diagram of a control device for eliminating protection and operation rejection of a primary air fan of a thermal power generating unit provided by the application;
fig. 2 is a schematic flow chart of a control method for eliminating protection refusal of a primary air fan of a thermal power generating unit according to the present application;
description of the reference numerals: the frequency conversion mode D1 and the power frequency mode D2 are realized by starting the primary fan D3 in a program-controlled manner, stopping the primary fan D4 in a program-controlled manner, protecting the primary fan D5 at 6KV low voltage, stopping the primary fan in an interlocking manner D6, operating the primary fan D7, stopping the primary fan D8, stopping the frequency converter D9 and tripping the 6KV switch D10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The application provides a control device and method for eliminating protection refusal of a primary air fan of a thermal power generating unit, and the control device and method are used for solving the technical problems that how to guarantee the reliability of a protection logic device and prevent the misoperation and refusal of the protection of a main auxiliary machine, realizing the normal shutdown of the primary air fan under a frequency conversion mode and a power frequency mode, achieving the independent protection action of the frequency conversion mode and the power frequency mode, effectively eliminating the risk of the protection refusal of the primary air fan, and avoiding the occurrence of the technical effects of serious hidden dangers such as boiler overpressure and the like.
Example one
As shown in fig. 1, the present application provides a control device for eliminating the protection rejection of a primary air fan of a thermal power generating unit, the device includes:
a motor primary drive stage;
the primary fan protection shutdown condition SPPRO module is connected with a left digital input port of the motor basic driving stage;
specifically, in the prior art, after the main fuel of the thermal power generating unit trips the MFT, a hard-line loop is designed for protecting two shutdown primary fans, and the hard-line loop trips of the primary fans are realized by connecting the primary fans and local equipment in parallel from the MFT relay cabinet to the sequence control cabinet and according to a primary fan opening instruction. The operation of a primary fan is divided into a power frequency mode and a frequency conversion mode, and the primary fan of a certain thermal power generating unit operates in the frequency conversion mode for a long time, so that when the protection device is designed, an MFT action hard wire loop is connected in parallel to a primary fan frequency converter brake-separating instruction, after MFT action, the primary fan can be normally protected and stopped when operating in the frequency conversion mode, but the primary fan is mainly protected and refused to operate in the power frequency mode, the primary fan cannot be stopped and the overpressure of a boiler system is easily caused, and the great potential safety hazard exists.
The embodiment of the application provides a control device for eliminating protection and operation rejection of a primary air fan of a thermal power generating unit, wherein starting and operation stopping of the primary air fan are completed by a basic motor driving stage, a primary air fan protection operation stopping condition SPPRO module is arranged in the basic motor driving stage, and a left digital quantity input port of the basic motor driving stage is connected with an SPPRO port to jointly form the primary air fan protection operation stopping condition SPPRO module.
Preferably, the primary air fan protection shutdown condition SPPRO module includes: a 6kv low voltage protection port; and the primary fan interlocking stop port and the 6kV low-voltage protection port are connected with a left digital quantity input port of the basic drive stage of the motor through a selection condition module.
Preferably, the primary fan interlock port comprises a primary fuel trip (MFT) hard line circuit.
Preferably, the selection condition module is the primary air fan interlock stop port or the 6kv low-voltage protection port as a selection condition.
The establishment of the protection shutdown condition of the primary air fan is completed through the steps, and when 6kV low-voltage protection or main fuel tripping MFT is triggered, subsequent operation is carried out, so that a foundation is provided for the protection of the subsequent primary air fan.
The shutdown instruction module is connected with a STOP port on the right side of the basic drive stage of the motor and receives a trigger signal of the SPPRO module under the condition of protecting the shutdown of the primary air fan through the port of the basic drive stage of the motor, wherein the shutdown instruction module comprises a frequency converter STOP port and a jump 6KV switch port;
the frequency conversion mode output port is connected with the frequency converter stop port;
the power frequency mode output port is connected with the jump 6KV switch port;
preferably, the frequency conversion mode output port and the power frequency mode output port are arranged on the basic drive stage of the motor.
Specifically, in the embodiment of the application, the device further comprises a shutdown instruction module, the shutdown instruction module is connected with the STOP port on the right side of the basic drive level of the motor, after the SPPRO module under the condition of primary fan protection shutdown is triggered, the shutdown instruction is output from the STOP port on the right side of the basic drive level of the motor, the STOP port on the right side of the basic drive level of the motor is connected with the STOP port of the frequency converter and the jump 6KV switch port, meanwhile, the output port of the frequency conversion mode and the output port of the power frequency mode are added on the left side of the basic drive level of the motor, and the STOP instruction and the frequency conversion mode and the power frequency mode are respectively output to the STOP port of the frequency converter and the jump 6KV switch port.
When the SPPRO module under the condition of primary air fan protection shutdown is triggered, the shutdown instruction is output through the shutdown instruction module, the shutdown instruction is output to the frequency converter shutdown port in a frequency conversion mode, the shutdown instruction is output to the jump 6KV switch port in a power frequency mode, after 6KV low voltage or main fuel tripping MFT triggering is achieved, the primary air fan can be correctly shut down in the frequency conversion and power frequency modes, and the possibility of primary air fan protection rejection is eliminated.
Furthermore, the basic driving stage of the motor comprises a program control input port, and the program control input port is connected with a program control starting primary air fan port and a program control stopping primary air fan port.
Further, the motor base drive stage further includes: the STTD output end is connected with the program-controlled starting primary air fan port and outputs a primary air fan running instruction; and the STPD output end is connected with the program-controlled stop primary air fan port and outputs a primary air fan stop instruction.
The device provided by the embodiment of the application only needs to lay a small number of signal cables, 3 input and output ports such as a frequency conversion mode, a power frequency mode and a jump 6KV switch are added on the original driving stage, hardware of the control system of the existing thermal power generating unit can meet requirements, and the investment cost is low; besides the primary air fan, the device can also be applied to high-power frequency conversion equipment such as air blowers, induced draft fans, condensate pumps and the like, has a good effect on improving the reliability of the system, and has strong popularization significance.
To sum up, the control device for eliminating the protection and the refusal of the primary air fan of the thermal power generating unit provided by the embodiment of the application has the following technical effects:
1. according to the control device for eliminating the protection and the refusal of the primary fan of the thermal power generating unit, the primary fan protection shutdown condition SPPRO module is formed by inputting 6 kilovolt low-voltage protection or main fuel tripping MFT hard line loop to the left side of a basic driving level of a motor; setting a shutdown instruction module, wherein the shutdown instruction module is connected with a STOP port on the right side of the basic drive level of the motor, and receives a trigger signal of the primary air fan protection shutdown condition SPPRO module through the STOP port of the basic drive level of the motor, and the shutdown instruction module comprises a frequency converter STOP port and a jump 6KV switch port; meanwhile, a frequency conversion mode output port and a power frequency mode output port are added on the left side of a basic driving stage of the motor, and the STOP outage instruction is respectively AND-output to a frequency converter STOP port and a jump 6KV switch port with the frequency conversion mode and the power frequency mode; the technical problems of ensuring the reliability of a protection logic device and preventing the main auxiliary machine protection from being mistakenly operated and refused are solved, the primary fan can be normally shut down in a frequency conversion mode and a power frequency mode, independent protection actions of the frequency conversion mode and the power frequency mode are achieved, the risk of refusing the primary fan protection is effectively eliminated, and the technical effects of serious hidden dangers such as boiler overpressure and the like are avoided.
2. The device provided by the application only needs to lay a small number of signal cables, 3 input and output ports such as a frequency conversion mode, a power frequency mode, a jump 6KV switch and the like are added on the original driving stage, the hardware of the control system of the existing thermal power generating unit can meet the requirements, and the investment cost is low; besides the primary air fan, the device can also be applied to high-power frequency conversion equipment such as an air feeder, an induced draft fan, a condensate pump and the like, has a good effect on improving the reliability of a system, and has a strong popularization significance.
Example two
As shown in fig. 2, the application provides a control method for eliminating protection rejection of a primary air blower of a thermal power generating unit, and the method includes:
s100: when 6kV low-voltage protection or main fuel tripping MFT is triggered, a primary fan operation mode is obtained;
s200: when the operation mode of the primary air fan is in a frequency conversion mode, the primary air fan is connected with an output port of the frequency conversion mode through an outage instruction, the frequency is output to a stop port of a frequency converter, and the protection operation is realized through the stop of the frequency converter;
s300: when the primary air fan is operated in a power frequency mode, the primary air fan is connected with the jump 6KV switch port through the outage instruction and is output to the jump 6KV switch port, and protection operation is achieved through the jump 6KV switch.
Specifically, after 6 kilovolt low-voltage protection or main fuel tripping MFT in a SPPRO module under a primary fan protection shutdown condition is triggered, a shutdown instruction is output from a STOP port on the right side of a basic driving level of a motor to obtain a primary fan operation mode, whether the primary fan operates in a frequency conversion mode or a power frequency mode is judged, and when the primary fan operation mode is in the frequency conversion mode, the shutdown instruction is connected with an output port of the frequency conversion mode and output to a STOP port of a frequency converter, protection operation is realized by stopping the frequency converter, and protection operation in the frequency conversion mode is realized; when the primary air fan is operated in a power frequency mode, the primary air fan is connected with the jump 6KV switch port through the outage instruction and is output to the jump 6KV switch port, and protection operation in the power frequency mode is achieved through the jump 6KV switch.
The embodiment of the application adopts the independent protection action of the frequency conversion mode and the power frequency mode, can effectively eliminate the risk of refusing the protection of the primary air fan, and avoids serious hidden dangers such as overpressure of the boiler and the like.
A person skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an eliminate protection of thermal power generating unit primary air fan and refuse to move controlling means which characterized in that, the device includes:
a motor primary drive stage;
the primary air fan protection shutdown condition SPPRO module is connected with a left digital quantity input port of the motor basic driving stage;
the shutdown instruction module is connected with a STOP port on the right side of the basic driving stage of the motor and receives a trigger signal of the SPPRO module under the condition of the primary fan protection shutdown through the port of the basic driving stage of the motor, wherein the shutdown instruction module comprises a frequency converter STOP port and a jump 6KV switch port;
the frequency conversion mode output port is connected with the frequency converter stop port;
the power frequency mode output port is connected with the jump 6KV switch port;
after the primary air fan protection shutdown condition SPPRO module is triggered, a shutdown instruction is output through the shutdown instruction module, the shutdown instruction is output to the frequency converter shutdown port in a frequency conversion mode, and the shutdown instruction is output to the jump 6KV switch port in a power frequency mode, so that protection action is achieved.
2. The apparatus of claim 1, wherein the primary fan protection outage condition SPPRO module comprises:
a 6kv low voltage protection port;
and the primary fan interlocking stop port and the 6kV low-voltage protection port are connected with a left digital input port of the basic drive stage of the motor through a selection condition module.
3. The apparatus of claim 2, wherein the primary fan interlock port comprises a primary fuel trip (MFT) hard-line loop.
4. The apparatus of claim 1, wherein the variable frequency mode output port and the power frequency mode output port are provided on a primary drive stage of the motor.
5. The apparatus of claim 1, wherein the motor primary drive stage includes a programmed input port connected to a programmed start primary blower port, a programmed stop primary blower port.
6. The apparatus of claim 5, wherein the motor base drive stage further comprises:
the STTD output end is connected with the program-controlled starting primary air fan port and outputs a primary air fan running instruction;
and the STPD output end is connected with the program-controlled stop primary air fan port and outputs a primary air fan stop instruction.
7. The apparatus of claim 2, wherein the selection condition module is the primary blower interlock shut-off port or the 6 kilovolt low voltage protection port as a selection condition.
8. A control method for eliminating protection refusal of a primary air fan of a thermal power generating unit is characterized in that the method is applied to the device of any one of claims 1-7, and the method comprises the following steps:
when 6kV low-voltage protection or main fuel tripping MFT is triggered, a primary fan operation mode is obtained;
when the primary air fan is operated in a frequency conversion mode, the primary air fan is connected with an output port of the frequency conversion mode through a shutdown instruction, the primary air fan is output to a stop port of the frequency converter, and the protection operation is realized through the stop of the frequency converter;
when the primary air fan is operated in a power frequency mode, the primary air fan is connected with the jump 6KV switch port through the outage instruction and is output to the jump 6KV switch port, and protection operation is achieved through the jump 6KV switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210840632.3A CN115333045A (en) | 2022-07-18 | 2022-07-18 | Control device and method for eliminating protection refusal of primary fan of thermal power generating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210840632.3A CN115333045A (en) | 2022-07-18 | 2022-07-18 | Control device and method for eliminating protection refusal of primary fan of thermal power generating unit |
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| Publication Number | Publication Date |
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| CN115333045A true CN115333045A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210840632.3A Pending CN115333045A (en) | 2022-07-18 | 2022-07-18 | Control device and method for eliminating protection refusal of primary fan of thermal power generating unit |
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| CN (1) | CN115333045A (en) |
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- 2022-07-18 CN CN202210840632.3A patent/CN115333045A/en active Pending
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