CN113457830A - Fault diagnosis method and system for hot air adjusting baffle - Google Patents
Fault diagnosis method and system for hot air adjusting baffle Download PDFInfo
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- CN113457830A CN113457830A CN202110673287.4A CN202110673287A CN113457830A CN 113457830 A CN113457830 A CN 113457830A CN 202110673287 A CN202110673287 A CN 202110673287A CN 113457830 A CN113457830 A CN 113457830A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
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Abstract
The invention relates to a fault diagnosis method and a fault diagnosis system for a hot air adjusting baffle, wherein a feedback value of the opening degree of the hot air adjusting baffle of a coal mill is obtained; judging whether the coal mill hot air adjusting baffle has a jamming fault or a sudden closing fault according to the feedback value of the opening of the coal mill hot air adjusting baffle; through obtaining the feedback value of the opening degree of the hot air adjusting baffle of the coal mill, whether the hot air adjusting baffle has a blocking fault or a sudden-closing fault can be diagnosed, so that an effective early warning can be given to a worker, and the problem that the hot air adjusting baffle frequently has faults such as blocking, sudden-closing and the like to cause great adverse consequences is avoided.
Description
Technical Field
The invention relates to the technical field of power station boiler pulverizing system control, in particular to a fault diagnosis method and system for a hot air adjusting baffle.
Background
A large-scale thermal power plant boiler is provided with a plurality of sets of powder making systems, a medium-speed coal mill primary air positive pressure direct-fired powder making system is adopted, and the boiler operates with basic load or peak shaving. The coal mill control system has the functions of controlling the temperature of an air-powder mixture at the outlet of the coal mill and controlling the primary air volume for conveying and drying coal powder, when the coal mill runs, the cold air adjusting baffle at the inlet of the coal mill is used for adjusting the outlet temperature of the coal mill, the hot air adjusting baffle at the inlet of the coal mill is used for adjusting the primary air volume at the inlet of the coal mill, and the coal feeding volume meets the requirement of fuel master control by adjusting the rotating speed of the coal feeder.
The working area where the hot air adjusting baffle of the coal mill is located has high temperature and large vibration; the large section of the air channel causes large stress of the hot air adjusting baffle; in addition, faults such as blocking, sudden closing and the like frequently occur on a hot air adjusting baffle of the coal mill due to the reasons of track dust accumulation, guide wheel abrasion and falling, door rod falling, electric head thermal module faults and the like.
Most power plants have carried out relevant transformation to the hot-blast adjusting damper of coal pulverizer at present, try to reduce ash leakage and vibration to shortened the maintenance cycle, still can't stop the emergence of this trouble. In addition, when faults such as blocking and sudden closing of a hot air adjusting baffle of the coal mill occur, the air quantity at the inlet of the coal mill can be quickly reduced, so that coal blockage of the coal mill or low-protection tripping of the air quantity at the inlet of the coal mill can be caused; the time for operators to find and process the coal is less than 10s, so that the coal mill is difficult to prevent from tripping, the output of a unit is limited, and the combustion of a hearth is severely disturbed and even the unit trips.
Disclosure of Invention
The invention provides a fault diagnosis method and a fault diagnosis system for a hot air adjusting baffle, which aim to solve the problem of large adverse effect caused by frequent faults of blocking, sudden closing and the like of the hot air adjusting baffle of the coal mill in the prior art.
In a first aspect, to solve the above technical problem, the present invention provides a method for diagnosing a fault of a hot air adjusting baffle, including:
acquiring a feedback value of the opening of the hot air adjusting baffle of the coal mill;
and judging whether the coal mill hot air adjusting baffle has a jamming fault or a sudden switching fault according to the feedback value of the opening of the coal mill hot air adjusting baffle.
The fault diagnosis method of the hot air adjusting baffle provided by the invention has the beneficial effects that: the problem of present because the hot-blast adjustable fender of coal pulverizer frequently takes place the card and dies, suddenly close the scheduling trouble and cause great bad consequence is solved, through the feedback value who acquires the hot-blast adjustable fender's of coal pulverizer aperture, can in time know the condition of hot-blast adjustable fender, thereby the convenience is through the processing to the feedback value of the aperture of hot-blast adjustable fender, with this whether the hot-blast adjustable fender of diagnosis has appeared the jam trouble or suddenly closed the trouble, thereby accomplish to give staff an effective early warning, and then avoid because hot-blast adjustable fender frequently takes place the card and dies, suddenly close the scheduling trouble and cause great bad consequence.
On the basis of the technical scheme, the fault diagnosis method of the hot air adjusting baffle can be further improved as follows.
Further, according to the feedback value of the aperture of the coal mill hot air adjusting baffle, whether the coal mill hot air adjusting baffle has a jamming fault or a sudden-closing fault is judged, including:
judging whether the first difference is larger than a first preset highest limit value or not to obtain a first judgment result, wherein the first difference is as follows: the difference value between the instruction value of the opening of the coal mill hot air adjusting baffle and the feedback value of the opening of the coal mill hot air adjusting baffle;
when the first judgment result is yes, judging whether the running time of the coal mill is greater than the preset running time or not to obtain a second judgment result;
and when the second judgment result is yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
The beneficial effect of adopting the further scheme is that: by judging whether the first difference value is larger than the first preset highest limit value or not, the error judgment of the fault caused by the large difference value between the instruction value and the feedback value of the opening degree of the hot air adjusting baffle can be effectively avoided. Meanwhile, by judging whether the running time of the coal mill is greater than the preset running time, the fault misjudgment caused by the fact that the coal mill is in an abnormal working condition at the initial starting stage can be avoided.
Further, still include:
judging whether the time when the first judgment result is yes is greater than first preset time or not to obtain a third judgment result;
when the second judgment result is yes, the method for judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill comprises the following steps:
and when the second judgment result and the third judgment result are both yes, judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill.
The beneficial effect of adopting the further scheme is that: whether the time when the first judgment result is yes is larger than the first preset time or not can be judged, whether a certain time delay is passed or not when the first difference value is larger than the first preset highest limit value can be detected, and meanwhile, fault misjudgment caused by too short time can be well avoided due to the setting of the first preset time.
Further, according to the feedback value of the aperture of the coal mill hot air adjusting baffle, whether the coal mill hot air adjusting baffle has a jamming fault or a sudden-closing fault is judged, including:
judging whether the feedback value of the opening degree of the hot air adjusting baffle of the coal mill is smaller than a first preset minimum limiting value or not to obtain a fourth judgment result;
when the fourth judgment result is yes, judging whether the running time of the coal mill is greater than the preset running time or not to obtain a fifth judgment result;
when the fifth judgment result is yes, judging whether the hot air adjusting baffle of the coal mill is in an automatic control state or not to obtain a sixth judgment result;
and when the sixth judgment result is yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
The beneficial effect of adopting the further scheme is that: whether the opening degree feedback value of the hot air adjusting baffle of the coal mill is smaller than a first preset minimum limit value or not can be effectively judged, and whether the hot air adjusting baffle is blocked or suddenly closed or not can be effectively judged; in addition, by judging whether the running time of the coal mill is greater than the preset running time, the fault misjudgment caused by the fact that the coal mill is in an abnormal working condition at the initial starting stage can be avoided; meanwhile, by judging whether the hot air adjusting baffle of the coal mill is in an automatic control state or not, fault misjudgment caused by manual operation of the hot air adjusting baffle can be avoided.
Further, still include:
judging whether the time when the fourth judgment result is yes is greater than second preset time or not to obtain a seventh judgment result;
when the sixth judgment result is yes, it is judged that the coal mill hot air adjusting baffle has a jamming fault or a sudden switching fault, and the method comprises the following steps:
and when the sixth judgment result and the seventh judgment result are both yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
The beneficial effect of adopting the further scheme is that: whether the time when the fourth judgment result is yes is larger than the second preset time or not can be judged, whether a certain time delay is passed or not when the feedback value of the opening degree of the hot air adjusting baffle is smaller than the first preset minimum limiting value can be detected, and meanwhile, the second preset time can be set to well avoid fault misjudgment caused by too short time.
Further, still include:
and when the coal mill hot air adjusting baffle has a blocking fault or a sudden closing fault, adjusting the coal mill cold air adjusting baffle and the coal feeder to be in a manual control state by a user, and controlling the inlet air quantity of the coal mill to be larger than the preset lowest inlet air quantity value.
The beneficial effect of adopting the further scheme is that: the cold air adjusting baffle of the coal mill and the coal feeder are adjusted to be in a manual control state of a user, so that more serious consequences caused by the fact that the coal mill continues to operate in an automatic control state after a fault occurs can be avoided; the inlet air volume of the coal mill is controlled to be larger than the preset lowest inlet air volume value, so that coal blockage or tripping caused by rapid reduction of the inlet air volume of the coal mill when the coal mill breaks down can be effectively avoided, and a period of time for fault treatment is reserved for maintainers.
Further, controlling the inlet air volume of the coal mill to be larger than a preset minimum air volume value comprises:
adjusting the opening degree of the cold air adjusting baffle of the coal mill to a preset low operation opening degree value;
and adjusting the coal feeding amount of the coal feeder to a preset low operation coal feeding amount.
The beneficial effect of adopting the further scheme is that: through with the aperture of coal pulverizer cold wind adjusting damper is adjusted to predetermineeing low operation opening value to and adjust the coal supply volume of feeder to predetermineeing low operation coal supply volume, can be so that the entry amount of wind of coal pulverizer can not reduce because of the trouble is quick, thereby the stifled coal that leads to or the tripping operation, and then reserve out one section for the maintainer and carry out fault handling's time.
Further, still include:
when the hot air adjusting baffle of the coal mill has a blocking fault or a sudden switch fault, the coal mill automatically gives an alarm.
The beneficial effect of adopting the further scheme is that: when the hot air adjusting baffle has a blocking fault or a sudden switch fault, the coal mill can effectively inform operating personnel that the hot air adjusting baffle of the coal mill has the fault by automatically sending an alarm, so that the operating personnel is reminded to carry out fault maintenance.
In a second aspect, the invention provides a fault diagnosis system for a hot blast adjusting baffle, which comprises a controller,
the feedback value of the opening degree of the hot air adjusting baffle of the coal mill of the controller;
and the controller judges whether the coal mill hot air adjusting baffle has a jamming fault or a sudden closing fault according to the feedback value of the opening of the coal mill hot air adjusting baffle.
The fault diagnosis system of the hot air adjusting baffle provided by the invention has the beneficial effects that: the problem of present because the hot-blast adjustable fender of coal pulverizer frequently takes place the card and dies, suddenly close the scheduling trouble and cause great bad consequence is solved, through the feedback value who acquires the hot-blast adjustable fender's of coal pulverizer aperture, can in time know the condition of hot-blast adjustable fender, thereby the convenience is through the processing to the feedback value of the aperture of hot-blast adjustable fender, with this whether the hot-blast adjustable fender of diagnosis has appeared the jam trouble or suddenly closed the trouble, thereby accomplish to give staff an effective early warning, and then avoid because hot-blast adjustable fender frequently takes place the card and dies, suddenly close the scheduling trouble and cause great bad consequence.
Further, still include the low operation module:
when the coal mill hot air adjusting baffle has a blocking fault or a sudden closing fault, the low operation module adjusts the coal mill cold air adjusting baffle and the coal feeder to be in a manual control state for a user, and controls the inlet air quantity of the coal mill to be larger than a preset lowest inlet air quantity value.
The beneficial effect of adopting the further scheme is that: the cold air adjusting baffle of the coal mill and the coal feeder are adjusted to be in a manual control state of a user, so that more serious consequences caused by the fact that the coal mill continues to operate in an automatic control state after a fault occurs can be avoided; the inlet air volume of the coal mill is controlled to be larger than the preset lowest inlet air volume value, so that coal blockage or tripping caused by rapid reduction of the inlet air volume of the coal mill when the coal mill breaks down can be effectively avoided, and a period of time for fault treatment is reserved for maintainers.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is further described below with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic flow chart of a fault diagnosis method for a hot air adjusting baffle according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a specific fault diagnosis method for a hot air adjusting baffle according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another specific fault diagnosis method for a hot air adjusting baffle according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fault diagnosis system of a hot air adjusting baffle according to an embodiment of the present invention.
Detailed Description
The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.
The following describes a fault diagnosis method of a hot air adjusting damper according to an embodiment of the present invention with reference to the drawings.
Example one
As shown in fig. 1, a method for diagnosing a fault of a hot air adjusting baffle according to an embodiment of the present invention includes the following steps:
s100, obtaining a feedback value of the opening of a hot air adjusting baffle of the coal mill;
s200, judging whether the coal mill hot air adjusting baffle has a jamming fault or a sudden closing fault according to the feedback value of the opening of the coal mill hot air adjusting baffle.
The situation of the hot air adjusting baffle can be known in time by acquiring the feedback value of the opening degree of the hot air adjusting baffle of the coal mill, so that the hot air adjusting baffle can be conveniently processed through the feedback value of the opening degree of the hot air adjusting baffle, whether jamming faults or sudden shutdown faults occur to the hot air adjusting baffle can be diagnosed, effective early warning can be given to workers, and the problem that great adverse consequences are caused due to the frequent occurrence of jamming, sudden shutdown and other faults of the hot air adjusting baffle is avoided.
Preferably, as shown in fig. 2, the determining whether the blockage fault or the sudden shutdown fault occurs on the coal mill hot air adjusting baffle according to the feedback value of the opening degree of the coal mill hot air adjusting baffle includes:
s201, judging whether the first difference is larger than a first preset highest limit value or not to obtain a first judgment result, wherein the first difference is as follows: the difference value between the instruction value of the opening of the coal mill hot air adjusting baffle and the feedback value of the opening of the coal mill hot air adjusting baffle;
s202, when the first judgment result is yes, judging whether the running time of the coal mill is greater than the preset running time to obtain a second judgment result;
s203, when the second judgment result is yes, judging that the coal mill hot air adjusting baffle has a jamming fault or a sudden closing fault.
By judging whether the first difference value is larger than the first preset highest limit value or not, the error judgment of the fault caused by the large difference value between the instruction value and the feedback value of the opening degree of the hot air adjusting baffle can be effectively avoided. Meanwhile, by judging whether the running time of the coal mill is greater than the preset running time, the fault misjudgment caused by the fact that the coal mill is in an abnormal working condition at the initial starting stage can be avoided.
Further, still include:
s204, judging whether the time when the first judgment result is yes is greater than first preset time or not to obtain a third judgment result;
when the second judgment result is yes, the method for judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill comprises the following steps:
s205, when the second judgment result and the third judgment result are both yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
Whether the time when the first judgment result is yes is larger than the first preset time or not can be judged, whether a certain time delay is passed or not when the first difference value is larger than the first preset highest limit value can be detected, and meanwhile, fault misjudgment caused by too short time can be well avoided due to the setting of the first preset time.
Specifically, the first preset maximum limit value is set to 20%, and the preset operation time is 1200S.
1) When the instruction value of the opening degree of the hot air adjusting baffle is 80%, the feedback value of the opening degree of the hot air adjusting baffle is 50%, and the coal mill is operated for 3 minutes;
the first judgment result is yes because 80% -50% is more than 20%;
when the first judgment result is yes, continuously judging whether the running time of the coal mill is greater than the preset running time, wherein the second judgment result is no because the 3 minutes is equal to 180 seconds and 180 is less than 1200;
2) when the instruction value of the opening degree of the hot air adjusting baffle is 80%, the feedback value of the opening degree of the hot air adjusting baffle is 65%, and the coal mill is operated for 20 minutes;
because 80% -65% < 20%, the first judgment result is no, and the subsequent judgment is not carried out at this time;
3) when the instruction value of the opening degree of the hot air adjusting baffle is 80%, the feedback value of the opening degree of the hot air adjusting baffle is 55%, and the coal mill is operated for 25 minutes;
the first judgment result is yes because 80% -55% is more than 20%;
and when the first judgment result is yes, continuously judging whether the running time of the coal mill is greater than the preset running time, wherein the running time is equal to 1500 seconds in 25 minutes and is more than 1500, so that the second judgment result is yes, and at the moment, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
Preferably, in the case 3), it may be further determined whether the time when the first determination result is yes is greater than a first preset time, the first preset time is set to 60 seconds, and when the time when the first determination result is yes is 120 seconds, the third determination result is yes;
and at the moment, if the second judgment result and the third judgment result are both yes, judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill.
The first preset highest limit value is represented by a percentage, and can be set by a worker according to experience or automatically set by a system according to conditions; the unit of the preset operation time is a time unit and is generally expressed by seconds, specific numerical values are flexibly set by workers according to experience and the operation condition of the coal mill, and generally, the parameters start to normally operate about 600 seconds after the coal mill is started, so the preset operation time is generally more than 600 seconds; the unit of the first preset time is a time unit, generally expressed in seconds, and the specific numerical value is flexibly set by a worker according to experience and the operation condition of the coal mill, or can be automatically set by the system according to the condition.
Preferably, as shown in fig. 3, the determining whether the blockage fault or the sudden shutdown fault occurs on the coal mill hot air adjusting baffle according to the feedback value of the opening degree of the coal mill hot air adjusting baffle includes:
s211, judging whether a feedback value of the opening degree of the hot air adjusting baffle of the coal mill is smaller than a first preset minimum limit value or not, and obtaining a fourth judgment result;
s212, when the fourth judgment result is yes, judging whether the running time of the coal mill is greater than the preset running time to obtain a fifth judgment result;
s213, when the fifth judgment result is yes, judging whether the hot air adjusting baffle of the coal mill is in an automatic control state or not to obtain a sixth judgment result;
s214, when the sixth judgment result is yes, judging that the coal mill hot air adjusting baffle has a jamming fault or a sudden switching fault.
Whether the opening degree feedback value of the hot air adjusting baffle of the coal mill is smaller than a first preset minimum limit value or not can be effectively judged, and whether the hot air adjusting baffle is blocked or suddenly closed or not can be effectively judged; in addition, by judging whether the running time of the coal mill is greater than the preset running time, the fault misjudgment caused by the fact that the coal mill is in an abnormal working condition at the initial starting stage can be avoided; meanwhile, by judging whether the hot air adjusting baffle of the coal mill is in an automatic control state or not, fault misjudgment caused by manual operation of the hot air adjusting baffle can be avoided.
Further, still include:
s214, judging whether the time when the fourth judgment result is yes is longer than second preset time or not to obtain a seventh judgment result;
when the sixth judgment result is yes, it is judged that the coal mill hot air adjusting baffle has a jamming fault or a sudden switching fault, and the method comprises the following steps:
s215, when the sixth judgment result and the seventh judgment result are both yes, judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill.
Whether the time when the fourth judgment result is yes is larger than the second preset time or not can be judged, whether a certain time delay is passed or not when the feedback value of the opening degree of the hot air adjusting baffle is smaller than the first preset minimum limiting value can be detected, and meanwhile, the second preset time can be set to well avoid fault misjudgment caused by too short time.
Specifically, the first preset minimum limit value is set to 15%, and the preset operation time is 1200S.
When the feedback value of the opening degree of the hot air adjusting baffle of the coal mill is 10% and the running time of the coal mill is 25 minutes, the fourth judgment result is yes because 10% is less than 15%;
continuously judging whether the running time of the coal mill is greater than the preset running time or not, wherein the running time is 1500-1200, so that the fifth judgment result is yes;
whether the hot air adjusting baffle of the coal mill is in an automatic control state or not is continuously judged, a lowest value is set for an instruction value of the opening degree of the hot air adjusting baffle under a general condition, and the lowest value is larger than a first preset lowest limit value, so that whether the hot air adjusting baffle is in the automatic control state or not is judged, and fault misjudgment caused by manual operation of the hot air adjusting baffle can be well avoided. When the hot air adjusting baffle of the coal mill is in an automatic control state, the sixth judgment result is yes; at the moment, the blockage fault or the sudden switch fault of the coal mill hot air adjusting baffle can be judged.
Preferably, it may be further determined whether the time when the fourth determination result is yes is greater than the second preset time, the first preset time is set to 60 seconds, and when the time when the fourth determination result is yes is 120 seconds, the seventh determination result is yes;
and at the moment, if the fourth judgment result and the seventh judgment result are both yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
Preferably, as shown in fig. 1, the method further comprises:
s300, when the coal mill hot air adjusting baffle has a blocking fault or a sudden closing fault, adjusting the coal mill cold air adjusting baffle and the coal feeder to be in a manual control state by a user, and controlling the inlet air volume of the coal mill to be larger than the preset lowest inlet air volume value.
The coal mill cold air adjusting baffle and the coal feeder are adjusted to be in a manual control state by a user, so that more serious consequences caused by the fact that the coal mill continues to operate in an automatic control state after a fault occurs can be avoided; the inlet air volume of the coal mill is controlled to be larger than the preset lowest inlet air volume value, so that coal blockage or tripping caused by rapid reduction of the inlet air volume of the coal mill when the coal mill breaks down can be effectively avoided, and a period of time for fault treatment is reserved for maintainers.
Preferably, the method further comprises the following steps: the control coal pulverizer's entry amount of wind is greater than preset minimum amount of wind value and includes:
s301, adjusting the opening of the cold air adjusting baffle of the coal mill to a preset low operation opening value;
and S302, adjusting the coal feeding amount of the coal feeder to a preset low-operation coal feeding amount.
Through with the aperture of coal pulverizer cold wind adjusting damper is adjusted to predetermineeing low operation opening value to and adjust the coal supply volume of feeder to predetermineeing low operation coal supply volume, can be so that the entry amount of wind of coal pulverizer can not reduce because of the trouble is quick, thereby the stifled coal that leads to or the tripping operation, and then reserve out one section for the maintainer and carry out fault handling's time.
Preferably, the method further comprises the following steps: when the hot air adjusting baffle of the coal mill has a blocking fault or a sudden switch fault, the coal mill automatically gives an alarm.
When the hot air adjusting baffle has a blocking fault or a sudden switch fault, the coal mill can effectively inform operating personnel that the hot air adjusting baffle of the coal mill has the fault by automatically sending an alarm, so that the operating personnel is reminded to carry out fault maintenance.
Preferably, the method further comprises the following steps: and before fault diagnosis, the hot air adjusting baffle of the coal mill is adjusted to be in an automatic control state in advance. When the coal mill is in an automatic control state, fault misjudgment caused by manual operation can be avoided.
In the foregoing embodiments, although the steps are numbered as S100, S200, S300, etc., but only the specific embodiments are given in the present application, and a person skilled in the art may adjust the execution sequence of S100, S200, S300, etc. according to the actual situation, which is also within the protection scope of the present invention, and it is understood that some embodiments may include some or all of the above embodiments.
Example two
As shown in fig. 4, a fault diagnosis system for a hot air adjusting baffle according to an embodiment of the present invention includes a controller 100;
the controller 100 acquires a feedback value of the opening degree of the coal mill hot air adjusting baffle through a potentiometer 103 arranged on the coal mill hot air adjusting baffle 200;
the controller 100 judges whether the coal mill hot air adjusting baffle 200 has a jamming fault or a sudden closing fault according to the feedback value of the opening degree of the coal mill hot air adjusting baffle 200.
The controller 100 can timely know the condition of the hot air adjusting baffle by acquiring the feedback value of the opening degree of the hot air adjusting baffle of the coal mill, so that the hot air adjusting baffle can be conveniently processed through the feedback value of the opening degree of the hot air adjusting baffle, whether jamming faults or sudden shutdown faults occur in the hot air adjusting baffle can be diagnosed, effective early warning can be given to workers, and the problem that the faults such as jamming, sudden shutdown and the like frequently occur to the hot air adjusting baffle to cause large adverse consequences can be avoided.
Preferably, the controller 200 determines whether the coal mill hot air adjusting baffle 200 has a jamming fault or a sudden failure according to a feedback value of the opening degree of the coal mill hot air adjusting baffle 200, including:
as shown in fig. 4, the controller further includes a first determining module 101, where the first determining module 101 determines whether a first difference is greater than a first preset maximum limit value to obtain a first determination result, where the first difference is: the difference value between the instruction value of the opening of the coal mill hot air adjusting baffle 100 and the feedback value of the opening of the coal mill hot air adjusting baffle 100;
when the first judgment result is yes, the first judgment module 101 judges whether the running time of the coal mill is greater than the preset running time to obtain a second judgment result;
when the second judgment result is yes, the first judgment module 101 judges that the coal mill hot air adjusting baffle 200 has a jamming fault or a sudden-closing fault.
Whether the first difference value is greater than the first preset maximum limit value or not is judged through the first judging module 101 of the controller 200, so that misjudgment of faults caused by a large difference value between the instruction value and the feedback value of the opening degree of the hot air adjusting baffle can be effectively avoided. Meanwhile, by judging whether the running time of the coal mill is greater than the preset running time, the fault misjudgment caused by the fact that the coal mill is in an abnormal working condition at the initial starting stage can be avoided.
The above preferred embodiment further comprises:
the first judging module 101 judges whether the time when the first judging result is yes is longer than a first preset time to obtain a third judging result;
when the second judgment result is yes, the first judgment module 101 judges that the coal mill hot air adjusting baffle 200 has a jamming fault or a sudden-closing fault, and the method includes:
when the second judgment result and the third judgment result are both yes, the first judgment module 101 judges that the coal mill hot air adjusting baffle 200 has a jam fault or a sudden shutdown fault.
Whether the time when the first judgment result is yes is larger than the first preset time or not can be judged, whether a certain time delay is passed or not when the first difference value is larger than the first preset highest limit value can be detected, and meanwhile, fault misjudgment caused by too short time can be well avoided due to the setting of the first preset time.
The first preset highest limit value is represented by a percentage, and can be set by a worker according to experience or automatically set by a system according to conditions; the unit of the preset operation time is a time unit and is generally expressed by seconds, specific numerical values are flexibly set by workers according to experience and the operation condition of the coal mill, and generally, the parameters start to normally operate about 600 seconds after the coal mill is started, so the preset operation time is generally more than 600 seconds; the unit of the first preset time is a time unit, generally expressed in seconds, and the specific numerical value is flexibly set by a worker according to experience and the operation condition of the coal mill, or can be automatically set by the system according to the condition.
Preferably, the controller 200 determines whether the coal mill hot air adjusting baffle 200 has a jamming fault or a sudden failure according to a feedback value of the opening degree of the coal mill hot air adjusting baffle 200, including:
as shown in fig. 4, the controller further includes a second determining module 102, where the second determining module 102 determines whether a feedback value of the opening degree of the coal mill hot air adjusting baffle is smaller than a first preset minimum limit value, so as to obtain a fourth determination result;
when the fourth judgment result is yes, the second judgment module 102 judges whether the running time of the coal mill is greater than the preset running time to obtain a fifth judgment result;
when the fifth judgment result is yes, the second judgment module 102 judges whether the coal mill hot air adjusting baffle 200 is in an automatic control state, so as to obtain a sixth judgment result;
when the sixth judgment result is yes, the second judgment module 102 judges that the coal mill hot air adjusting baffle 200 has a jam fault or a sudden shut fault.
Whether the feedback value of the opening degree of the hot air adjusting baffle of the coal mill is smaller than a first preset minimum limit value or not is judged through a second judging module 102 of the controller 200, so that whether the hot air adjusting baffle is blocked or has a sudden failure or not can be effectively judged; in addition, by judging whether the running time of the coal mill is greater than the preset running time, the fault misjudgment caused by the fact that the coal mill is in an abnormal working condition at the initial starting stage can be avoided; meanwhile, by judging whether the hot air adjusting baffle of the coal mill is in an automatic control state or not, fault misjudgment caused by manual operation of the hot air adjusting baffle can be avoided.
The above preferred embodiment further comprises:
the second judging module 102 judges whether the time when the fourth judging result is yes is longer than a second preset time, so as to obtain a seventh judging result;
when the sixth determination result is yes, the second determining module 102 determines that the coal mill hot air adjusting baffle 200 has a jam fault or a sudden shutdown fault, including:
when the sixth judgment result and the seventh judgment result are both yes, the second judgment module 102 judges that the coal mill hot air adjusting baffle 200 has a jam fault or a sudden shutdown fault.
Whether the time when the fourth judgment result is yes is longer than the second preset time or not is judged through the controller 200, whether a certain time delay is passed or not in the case that the feedback value of the opening degree of the hot air adjusting baffle is smaller than the first preset minimum limiting value can be checked, and meanwhile, the fault misjudgment caused by the fact that the time is too short can be well avoided through the setting of the second preset time.
The first preset minimum limit value is represented by a percentage, and can be set by a worker according to experience or automatically set by a system according to conditions; the unit of the preset operation time is a time unit and is generally expressed by seconds, specific numerical values are flexibly set by workers according to experience and the operation condition of the coal mill, and generally, the parameters start to normally operate about 600 seconds after the coal mill is started, so the preset operation time is generally more than 600 seconds; the unit of the second preset time is a time unit, generally expressed in seconds, and the specific numerical value is flexibly set by a worker according to experience and the operation condition of the coal mill, or can be automatically set by the system according to the condition.
Preferably, as shown in fig. 4, a low operation module 300 is further included;
when the coal mill hot air adjusting baffle 200 has a jam fault or a sudden-closing fault, the low operation module 300 adjusts the coal mill cold air adjusting baffle 400 and the coal feeder 500 to be in a manual control state by a user, and controls the inlet air volume of the coal mill to be larger than the preset lowest inlet air volume value.
Preferably, the controlling the inlet air volume of the coal mill to be larger than the preset minimum air volume value comprises:
the low-operation module 300 adjusts the opening of the coal mill cold air adjusting baffle 400 to a preset low-operation opening value;
the low operation module 300 adjusts the coal feed amount of the coal feeder 500 to a preset low operation coal feed amount.
Specifically, the preset low-operation opening value is set to be 100%, and the preset low-operation coal feeding amount is 20 t/h. When the coal mill hot air adjusting baffle 200 has a jamming fault or a sudden switching fault, the low operation module is triggered, then an instruction is sent to a control loop of the coal mill cold air adjusting baffle 400 and a control loop of the coal feeder 500, and the coal mill cold air adjusting baffle 400 and the coal feeder 500 are switched to a user manual control state; meanwhile, an instruction for adjusting the opening degree of the cold air adjusting baffle is sent to a control loop of the cold air adjusting baffle 400, and the opening degree of the cold air adjusting baffle 400 of the coal mill is adjusted to a preset low-operation opening value; in addition, an instruction for adjusting the coal feeding amount is sent to the control loop of the coal feeder 500, and the coal feeding amount of the coal feeder 500 is adjusted to the preset low-operation coal feeding amount.
The cold air adjusting baffle of the coal mill and the coal feeder are adjusted to be in a manual control state of a user, so that the more serious consequence caused by the fact that the coal mill continues to operate in an automatic control state after a fault occurs can be avoided.
The preset low-operation opening value is generally expressed by percentage, can be set by a worker according to experience and conditions, or can be automatically set by a system according to conditions, and the maximum preset low-operation opening value can be 100%; the unit of the coal feeding amount is ton, and the coal feeding amount can be set by workers according to experience and conditions or can be automatically set by a system according to conditions.
The unit of the preset lowest inlet air volume value is ton/hour, and under the ordinary condition, as long as the preset lowest inlet air volume value is larger than 45t/h after the opening degree of the cold air adjusting baffle 400 and the coal feeding amount of the coal feeder 500 are set, coal blockage or tripping caused by rapid reduction of the inlet air volume can be effectively avoided when the coal mill breaks down, so that a period of time for fault treatment is reserved for maintainers.
The above-mentioned parameters and steps of implementing corresponding functions in the fault diagnosis system of the hot air adjusting baffle according to the present invention refer to the above-mentioned parameters and steps in the embodiment of the fault diagnosis method of the hot air adjusting baffle, which are not described herein again.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A fault diagnosis method of a hot air adjusting baffle is characterized in that:
acquiring a feedback value of the opening of the hot air adjusting baffle of the coal mill;
and judging whether the coal mill hot air adjusting baffle has a jamming fault or a sudden switching fault according to the feedback value of the opening of the coal mill hot air adjusting baffle.
2. The method for diagnosing the fault of the hot air adjusting baffle plate of the coal mill according to claim 1, wherein the step of judging whether the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle plate of the coal mill according to the feedback value of the opening degree of the hot air adjusting baffle plate of the coal mill comprises the following steps:
judging whether the first difference is larger than a first preset highest limit value or not to obtain a first judgment result, wherein the first difference is as follows: the difference value between the instruction value of the opening of the coal mill hot air adjusting baffle and the feedback value of the opening of the coal mill hot air adjusting baffle;
when the first judgment result is yes, judging whether the running time of the coal mill is greater than the preset running time or not to obtain a second judgment result;
and when the second judgment result is yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
3. The method for diagnosing a malfunction of a hot air adjusting baffle according to claim 2, further comprising:
judging whether the time when the first judgment result is yes is greater than first preset time or not to obtain a third judgment result;
when the second judgment result is yes, the method for judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill comprises the following steps:
and when the second judgment result and the third judgment result are both yes, judging that the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle of the coal mill.
4. The method for diagnosing the fault of the hot air adjusting baffle plate of the coal mill according to claim 1, wherein the step of judging whether the blockage fault or the sudden shutdown fault occurs on the hot air adjusting baffle plate of the coal mill according to the feedback value of the opening degree of the hot air adjusting baffle plate of the coal mill comprises the following steps:
judging whether the feedback value of the opening degree of the hot air adjusting baffle of the coal mill is smaller than a first preset minimum limiting value or not to obtain a fourth judgment result;
when the fourth judgment result is yes, judging whether the running time of the coal mill is greater than the preset running time or not to obtain a fifth judgment result;
when the fifth judgment result is yes, judging whether the hot air adjusting baffle of the coal mill is in an automatic control state or not to obtain a sixth judgment result;
and when the sixth judgment result is yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
5. The method for diagnosing a malfunction of a hot air adjusting baffle according to claim 4, further comprising:
judging whether the time when the fourth judgment result is yes is greater than second preset time or not to obtain a seventh judgment result;
when the sixth judgment result is yes, it is judged that the coal mill hot air adjusting baffle has a jamming fault or a sudden switching fault, and the method comprises the following steps:
and when the sixth judgment result and the seventh judgment result are both yes, judging that the blockage fault or the sudden switch fault occurs on the hot air adjusting baffle of the coal mill.
6. The method for diagnosing a malfunction of a hot air adjusting baffle according to claim 1, further comprising:
and when the coal mill hot air adjusting baffle has a blocking fault or a sudden closing fault, adjusting the coal mill cold air adjusting baffle and the coal feeder to be in a manual control state by a user, and controlling the inlet air quantity of the coal mill to be larger than the preset lowest inlet air quantity value.
7. The method for diagnosing the fault of the hot air adjusting baffle according to claim 6, wherein the controlling the inlet air volume of the coal mill to be larger than the preset minimum air volume value comprises:
adjusting the opening degree of the cold air adjusting baffle of the coal mill to a preset low operation opening degree value;
and adjusting the coal feeding amount of the coal feeder to a preset low operation coal feeding amount.
8. The method for diagnosing a malfunction of a hot blast adjusting baffle according to any one of claims 1 to 6, further comprising:
when the hot air adjusting baffle of the coal mill has a blocking fault or a sudden switch fault, the coal mill automatically gives an alarm.
9. The fault diagnosis system of the hot air adjusting baffle is characterized by comprising a controller;
the feedback value of the opening degree of the hot air adjusting baffle of the coal mill of the controller;
and the controller judges whether the coal mill hot air adjusting baffle has a jamming fault or a sudden closing fault according to the feedback value of the opening of the coal mill hot air adjusting baffle.
10. The system for diagnosing faults of a hot blast adjusting baffle according to claim 9, further comprising a low operation module:
when the coal mill hot air adjusting baffle has a blocking fault or a sudden closing fault, the low operation module adjusts the coal mill cold air adjusting baffle and the coal feeder to be in a manual control state for a user, and controls the inlet air quantity of the coal mill to be larger than a preset lowest inlet air quantity value.
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