CN111413096B - Vibration protection system with high-temperature blocking function and method - Google Patents
Vibration protection system with high-temperature blocking function and method Download PDFInfo
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- CN111413096B CN111413096B CN202010312165.8A CN202010312165A CN111413096B CN 111413096 B CN111413096 B CN 111413096B CN 202010312165 A CN202010312165 A CN 202010312165A CN 111413096 B CN111413096 B CN 111413096B
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Abstract
A vibration protection system with high temperature blocking and a method thereof are provided, the method comprises the following steps: the vibration measuring probe acquires a vibration value of a turbine bearing of the generator set, and the vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe; the temperature detection module arranged on the vibration measurement probe protection box acquires the working temperature of the vibration measurement probe; a pressure transmitter arranged at a bearing shaft seal steam supply position collects the shaft seal pressure of a bearing; the unit operation signal acquisition module acquires a generator set operation signal; the alarm signal acquisition module acquires an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system; and the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal. The invention can filter out vibration measurement noise caused by sudden high temperature and avoid the generator set from generating error interruption.
Description
Technical Field
The invention relates to the technical field of detection of vibration states of steam turbine bearings of large-scale generator sets, in particular to a vibration protection system with high-temperature blocking and a method.
Background
At present, a bearing vibration measurement probe protection box is generally arranged above a turbine rotor bearing, the space is narrow, and the air circulation is not smooth. When the bearing vibration measurement probe protection box is affected by shaft seal steam leakage or other reasons, sudden high temperature occurs at the bearing vibration measurement probe protection box, so that the vibration measurement probe in the bearing vibration measurement probe protection box is damaged or vibration measurement noise deviating from a true value is caused. In the conventional design of domestic and foreign generator sets, bearing vibration measurement is an important protection monitoring signal for ensuring that a steam turbine shafting is not broken or damaged, and generally any vibration measurement value is set to exceed a design threshold value of a host factory, namely a turbine emergency interruption system sends out a unit interruption instruction, so that the whole generator set is forcibly stopped from a conventional operation state, and serious accidents of shafting damage (usually the accident loss amount reaches more than ten million yuan) are avoided. However, with the increasing of the working parameters of the generator set in recent years, the working environment of the vibration measurement probe often exceeds the temperature design limit, so that the generator set is stopped due to the error of vibration measurement noise, tens of millions of dollars of economic loss is brought to power generation enterprises, similar events occur again and again in the national range, and the vibration protection reliability research of the steam turbine becomes a key work. Therefore, it is necessary to design a vibration protection system with high temperature blocking to filter out vibration measurement noise caused by sudden high temperature and prevent economic loss caused by mistaken blocking of the generator set.
Disclosure of Invention
The invention mainly aims to provide a vibration protection system with high-temperature blocking and a method thereof, which are used for monitoring the working state of a vibration measurement probe of a turbine bearing of a generator unit in a high-temperature environment in real time, filtering out vibration measurement noise caused by sudden high temperature and avoiding the generation of false blocking of the generator unit.
The invention adopts the following technical scheme:
in one aspect, the present invention is a vibration protection system with high temperature blocking, comprising: the device comprises a vibration measuring probe, a vibration measuring probe protection box, a temperature detection module, a pressure transmitter, a unit operation signal acquisition module, an alarm signal acquisition module and a comprehensive processing module; the vibration measuring probe is used for acquiring a vibration value of a turbine bearing of the generator set, and the vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe; the temperature detection module is arranged on the vibration measuring probe protection box to acquire the working temperature of the vibration measuring probe; the pressure transmitter is arranged at the bearing shaft seal steam supply position to acquire the shaft seal pressure of the bearing; the unit operation signal acquisition module is used for acquiring an operation signal of the steam turbine generator unit; the alarm signal acquisition module is used for acquiring an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system; and the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal.
Preferably, the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal, and specifically comprises:
a. the value of the learning confirmation coefficient is judged as follows:
wherein K represents a learning confirmation coefficient; r represents a unit operation signal, the unit operation is 1, and the unit non-operation is 0; s represents whether an alarm signal exists or not, the alarm is set to be 1, and the alarm is not set to be 0;
indicating that S is negated; t isHIndicating whether the working temperature exceeds a preset working temperature threshold value, and if so, taking 1, otherwise, taking 0; pHIndicating whether the shaft seal pressure exceeds a preset shaft seal pressure threshold value, and taking 1 if the shaft seal pressure exceeds the preset shaft seal pressure threshold value, or taking 0 if the shaft seal pressure does not exceed the preset shaft seal pressure threshold value; represents a logical AND; + represents a logical or;
b. if the learning confirmation coefficient is 1, judging whether the vibration value exceeds a first preset vibration threshold value, if so, sending a vibration high-temperature early warning signal, and judging whether the vibration value exceeds a second preset vibration threshold value; if the vibration value exceeds a second preset vibration threshold value, a vibration high-temperature blocking signal with preset duration is sent out, and when the high-temperature blocking signal is sent out, the vibration value cannot send out a unit vibration blocking signal even if the vibration value exceeds the vibration blocking value; and if the vibration value still exceeds a second preset vibration threshold value and reaches a vibration interruption value after the preset time length, sending a vibration interruption signal.
Preferably, the temperature detection module comprises a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor is arranged at the inner bottom of the vibration measurement probe protection box; the second temperature sensor is arranged on the inner side surface, close to the heat source, of the vibration measurement probe protection box; the third temperature sensor is arranged on the outer side surface, close to the heat source, of the vibration measurement probe protection box.
Preferably, said T isHThe acquisition method comprises the following steps:
TH＝(TAH+TBH)·TCH
wherein, TAHThe temperature acquired by the first temperature sensor is represented as whether being greater than a first preset temperature threshold, and the value of the temperature includes 0 or 1; TBHWhether the temperature acquired by the second temperature sensor is greater than a second preset temperature threshold value or not is represented, and the value includes 0 or 1; TC (tungsten carbide)HAnd whether the temperature acquired by the third temperature sensor is greater than a third preset temperature threshold value or not is represented, and the value includes 0 or 1.
Preferably, the first preset temperature threshold, the second preset temperature threshold and the third preset temperature threshold are obtained by performing statistical analysis on historical collected data.
Preferably, the preset shaft seal pressure threshold value is set as a pressure alarm value specified by an operation regulation of the steam turbine generator unit.
Preferably, the method for acquiring the first preset vibration threshold includes:
comparing the vibration mutation value of the bearing with a vibration mutation initial estimation threshold, and if the vibration mutation value of the bearing is smaller than the vibration mutation initial estimation threshold in a learning period, setting the vibration mutation threshold as the vibration mutation initial estimation threshold minus a preset value; if the vibration mutation values of the bearings in one learning period are all larger than the vibration mutation initial estimation threshold value, setting the vibration mutation threshold value as the vibration mutation initial estimation threshold value plus a preset value; setting a vibration sudden change threshold as a vibration sudden change initial estimation threshold if the bearing vibration sudden change value fluctuates in a vibration sudden change initial estimation threshold interval within one learning period;
setting a vibration sudden change threshold value obtained after one or more learning periods as a first preset vibration threshold value;
the bearing vibration variation value is set to be PHThe maximum value of the vibration value of the steam turbine bearing of the generator set within a time range before and after 1, or the sudden change value of the vibration of the bearing is set as THThe maximum value of the vibration value of the turbine bearing of the generator unit in a time range before and after 1.
Preferably, the method for acquiring the second preset vibration threshold includes:
and selecting a certain value between the first preset vibration threshold value and the vibration interruption value as a second preset vibration threshold value.
In another aspect, the invention relates to a vibration protection method with high temperature blocking, comprising:
the vibration measuring probe acquires a vibration value of a turbine bearing of the generator set, and the vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe;
the temperature detection module arranged on the vibration measurement probe protection box acquires the working temperature of the vibration measurement probe;
a pressure transmitter arranged at a bearing shaft seal steam supply position collects the shaft seal pressure of a bearing;
the unit operation signal acquisition module acquires a generator set operation signal;
the alarm signal acquisition module acquires an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system;
and the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal.
Preferably, the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal, and specifically comprises:
a. the value of the learning confirmation coefficient is judged as follows:
wherein K represents a learning confirmation coefficient; r represents a unit operation signal, the unit operation is 1, and the unit non-operation is 0; s represents whether an alarm signal exists or not, the alarm is set to be 1, and the alarm is not set to be 0;
indicating that S is negated; t isHIndicating whether the working temperature exceeds a preset working temperature threshold value, and if so, taking 1, otherwise, taking 0; pHIndicating whether the shaft seal pressure exceeds a preset shaft seal pressure threshold value, and taking 1 if the shaft seal pressure exceeds the preset shaft seal pressure threshold value, or taking 0 if the shaft seal pressure does not exceed the preset shaft seal pressure threshold value; represents a logical AND; + represents a logical or;
b. if the learning confirmation coefficient is 1, judging whether the vibration value exceeds a first preset vibration threshold value, if so, sending a vibration high-temperature early warning signal, and judging whether the vibration value exceeds a second preset vibration threshold value; if the vibration value exceeds a second preset vibration threshold value, a vibration high-temperature blocking signal with preset duration is sent out, and when the high-temperature blocking signal is sent out, the vibration value cannot send out a unit vibration blocking signal even if the vibration value exceeds the vibration blocking value; and if the vibration value still exceeds a second preset vibration threshold value and reaches a vibration interruption value after the preset time length, sending a vibration interruption signal.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a vibration protection system with high-temperature blocking and a method thereof, which are used for monitoring the working state of a vibration measuring probe of a turbine bearing of a generator set in a high-temperature environment in real time, and when high temperature is detected and vibration mutation occurs, firstly, a high-temperature early warning signal is sent out to remind operation and maintenance personnel to take intervention measures in advance, and then, a vibration high-temperature blocking signal is sent out, and a vibration blocking signal is sent out only when the vibration mutation exceeds a certain duration and a certain threshold, so that the phenomenon that the generator set is blocked and stopped due to the error measurement of the vibration measuring probe in the high-temperature environment is avoided.
Drawings
FIG. 1 is a schematic structural view of a vibration protection system with high temperature block of the present invention;
FIG. 2 is a flow chart of the vibration protection method with high temperature block of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the present invention relates to a vibration protection system with high temperature blocking, comprising: the device comprises a vibration measuring probe, a vibration measuring probe protection box, a temperature detection module, a pressure transmitter, a unit operation signal acquisition module, an alarm signal acquisition module and a comprehensive processing module; the vibration measuring probe is used for acquiring a vibration value of a turbine bearing of the generator set, and the vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe; the temperature detection module is arranged on the vibration measuring probe protection box to acquire the working temperature of the vibration measuring probe; the pressure transmitter is arranged at the bearing shaft seal steam supply position to acquire the shaft seal pressure of the bearing; the unit operation signal acquisition module is used for acquiring a generator set operation signal; the alarm signal acquisition module is used for acquiring an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system; and the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal.
Specifically, the comprehensive processing module judges whether to send out vibration high temperature early warning signal, vibration high temperature blocking signal or vibration blocking signal based on the vibration value, the operating temperature, the shaft seal pressure, the unit operation signal and the alarm signal, and specifically includes:
a. the value of the learning confirmation coefficient is judged as follows:
wherein K represents a learning confirmation coefficient; r represents a unit operation signal, the unit operation is 1, and the unit non-operation is 0; s represents whether an alarm signal exists or not, the alarm is set to be 1, and the alarm is not set to be 0;
indicating that S is negated; t isHIndicating whether the working temperature exceeds a preset working temperature threshold value, and if so, taking 1, otherwise, taking 0; pHIndicating whether the shaft seal pressure exceeds a preset shaft seal pressure threshold value, and taking 1 if the shaft seal pressure exceeds the preset shaft seal pressure threshold value, or taking 0 if the shaft seal pressure does not exceed the preset shaft seal pressure threshold value; represents a logical AND; + represents a logical or, i.e. 1, as long as the operating temperature exceeds the preset operating temperature threshold or the gland seal pressure exceeds the preset gland seal pressure threshold.
In this embodiment, the unit operation signal, the working temperature, the shaft seal pressure and the alarm information can be collected by a DCS system. For the unit operation signal, as long as the turbine generator unit is in an operation state, R is a value of 1, and when the turbine generator unit stops operating, R is a value of 0, and the specific acquisition method of the unit operation information may be any one of the existing acquisition methods, which is not limited in this embodiment. When the self-checking of a steam turbine state detection TSI system or a bearing vibration measurement system is normal, alarm information is not sent to a DCS, and S takes a value of 0; when the self-checking of the steam turbine state detection TSI system or the bearing vibration measurement system is abnormal, namely when the occurrence of preset alarm information is detected, the alarm information is sent to the DCS, and the value of S is 1.
In summary, the learning confirmation coefficient is 1 only when the turbonator unit is in an operating state, no preset alarm signal appears, and the working temperature exceeds the preset working temperature threshold or the shaft seal pressure exceeds the preset shaft seal pressure threshold.
b. If the learning confirmation coefficient is 1, judging whether the vibration value exceeds a first preset vibration threshold value, if so, sending a vibration high-temperature early warning signal, and judging whether the vibration value exceeds a second preset vibration threshold value; if the vibration value exceeds a second preset vibration threshold value, a vibration high-temperature blocking signal with preset duration is sent out, and when the high-temperature blocking signal is sent out, the vibration value cannot send out a unit vibration blocking signal even if the vibration value exceeds the vibration blocking value; and if the vibration value still exceeds a second preset vibration threshold value and reaches a vibration interruption value after the preset time length, sending a vibration interruption signal.
In this embodiment, the temperature detection module includes a first temperature sensor, a second temperature sensor, and a third temperature sensor; the first temperature sensor is arranged at the inner bottom of the vibration measuring probe protection box, and a temperature signal measured by the first temperature sensor is represented as TA(ii) a The second temperature sensor is arranged on the inner side surface, close to the heat source, of the vibration measurement probe protection box, and a temperature signal measured by the second temperature sensor is represented as TB(ii) a The third temperature sensor is arranged on the outer side surface of the vibration measurement probe protection box close to the heat source, and a temperature signal measured by the third temperature sensor is represented as TC。
Specifically, first temperature sensor with second temperature sensor can adopt SMD sensor, first temperature sensor pastes the interior bottom of vibration measuring probe protection box, second temperature sensor pastes a medial surface of vibration measuring probe protection box. Or a slot is formed in the inner side or the inner bottom of the vibration measurement probe protection box, so that the first temperature sensor and the second temperature sensor can be just clamped into the slot.
Further, said THThe acquisition method comprises the following steps:
TH＝(TAH+TBH)·TCH
wherein, TAHThe temperature acquired by the first temperature sensor is represented as whether being greater than a first preset temperature threshold, and the value of the temperature includes 0 or 1; TBHWhether the temperature acquired by the second temperature sensor is greater than a second preset temperature threshold value or not is represented, and the value includes 0 or 1; TC (tungsten carbide)HIndicating whether the temperature collected by the third temperature sensor is greater than a third preset temperature thresholdValues, including 0 or 1; + represents a logical or.
In this embodiment, the first preset temperature threshold, the second preset temperature threshold, and the third preset temperature threshold are obtained by performing statistical analysis on historical collected data.
After the first temperature sensor, the second temperature sensor and the third temperature sensor are installed, the T collected for any 100 days (which can be specifically selected according to actual conditions, and is only an example) is takenA、TBAnd TCRespectively carrying out statistical analysis on the historical data, and respectively taking the median between the mode and the maximum extreme value of the normal operation temperature range as a first preset temperature threshold value TAMAXA second predetermined temperature threshold TBMAXAnd a third preset temperature threshold TCMAX。TAHA value of 1 represents the temperature T acquired in real timeAIs greater than or equal to a first preset temperature threshold TAMAX，TBHA value of 1 represents the temperature T acquired in real timeBIs more than or equal to a second preset temperature threshold value TBMAX，TCHT for real-time acquisition is denoted by 1CGreater than or equal to a third preset temperature threshold TCMAX。
Mode is a statistical term that represents the average level of data with a statistically significant number of central trend points. Is the value that appears most frequently in a set of data, called the mode. Simply, it is the most proportional number of a set of data.
The preset shaft seal pressure threshold value PMAXAnd setting a pressure alarm value specified by the operation regulation of the steam turbine generator unit. PH1 represents that the shaft seal pressure value P measured in real time at the measured bearing is more than or equal to the preset shaft seal pressure threshold value PMAX。
The method for acquiring the first preset vibration threshold comprises the following steps:
designing a vibration sudden change threshold beta in an integrated processing modulenThe bearing vibration variation value VB of the iterative learning loopMAXAnd initial estimation threshold beta of vibration mutation0Comparing if the bearing vibration variation value VB in a learning periodMAXAre all less than the vibration sudden change initialEstimate threshold beta0Then the vibration is abruptly changed by a threshold value beta1Setting as the initial estimation threshold beta of the sudden vibration change0Reducing a preset value; if the bearing vibration variation value VB in a learning periodMAXAre all larger than the initial estimation threshold beta of the vibration mutation0Then the vibration is abruptly changed by a threshold value beta1Setting as the initial estimation threshold beta of the sudden vibration change0Adding a preset value; if the bearing vibration variation value VB in a learning periodMAXInitial estimation of threshold beta at sudden changes in vibration0If the interval fluctuates, the vibration is suddenly changed to a threshold value beta1Setting as the initial estimation threshold beta of the sudden vibration change0；
The vibration mutation threshold value beta obtained after one or more learning cyclesnSet to a first preset vibration threshold.
The preset value may be selected according to actual conditions, and specifically, may be set to 5 in this embodiment.
The bearing vibration variation value VBMAXIs set to be PHThe maximum value of the vibration value of the steam turbine bearing of the generator set within a time t range before and after 1, or the vibration sudden change value VB of the bearingMAXIs set to THThe maximum value of the vibration value of the steam turbine bearing of the generator unit within a time t range before and after 1. The t is generally selected for 2-10 minutes according to the actual field parameter change condition.
The initial estimation threshold beta of the vibration mutation0The vibration alarm value VBH designed by the original turbine state detection system TSI or the bearing monitoring system can be used.
Specifically, the vibration mutation threshold beta is subjected to iterative learning in a DCS (distributed control system) to obtain a historical optimal value betan. When a sudden change of vibration occurs once, learning is performed after the learning confirmation coefficient K is judged to be valid (namely K is 1), and learning is not performed when the learning confirmation coefficient K is judged to be invalid. Every time learning is performed, the learning rate is added by 1. Setting a learning rate lambda termination value, terminating the DCS iterative learning when the learning times reach the learning rate lambda termination value, and obtaining a historical optimal value beta of the vibration mutation threshold valuen。
For example, the learning rate λ is set to 5 times (the specific times can be set according to actual conditions) as a weekAnd (4) period. If in a learning period, the bearing vibration variation value VBMAXAre all smaller than the initial estimation threshold beta of the vibration mutation0Then the vibration abruptly changes the threshold value beta1＝β0-5; if in a learning period, the bearing vibration variation value VBMAXAre all larger than the initial estimation threshold beta of the vibration mutation0Then the vibration abruptly changes the threshold value beta1＝β0+ 5; if in a learning period, the bearing vibration variation value VBMAXInitial estimation of threshold beta at sudden changes in vibration0If the interval fluctuates, the vibration mutation threshold value beta is obtained1＝β0. The obtained vibration mutation threshold beta is obtained after a plurality of learning cycles (the specific cycle number can be set according to the actual situation)nI.e. the historical optimum.
The method for acquiring the second preset vibration threshold gamma comprises the following steps:
a certain value between the first preset vibration threshold value and the vibration cutoff value VBHH is selected as the second preset vibration threshold value.
The vibration interruption value VBHH can use the vibration interruption trip value designed by the original turbine state detection system TSI or the bearing monitoring system.
In particular, when learning confirms that the coefficient K is equal to 1 and the vibration value V is acquired in real timenGreater than or equal to the vibration sudden change threshold betanThen, sending out a vibration high-temperature early warning signal through a DCS system; when learning confirms that the coefficient K is equal to 1 and VnWhen the frequency is more than or equal to gamma, the DCS sends a high-temperature blocking signal with the time length of 3-5 s to the ETS cabinet of the turbine emergency blocking system, namely, if the vibration value of the bearing is higher than the vibration blocking value VBHH in 3-5 s, the blocking signal is not sent, if the vibration value of the bearing collected in real time is still higher than the vibration blocking value VBHH after 3-5 s, in order to ensure the safety of the turbine or the rotating machinery, the ETS cabinet of the turbine emergency blocking system sends the vibration blocking signal.
Referring to fig. 2, in another aspect, the present invention provides a method for vibration protection with high temperature blocking, including:
s201, a vibration measuring probe collects a vibration value of a steam turbine bearing of the generator set, and a vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe;
s202, a temperature detection module arranged on a vibration measurement probe protection box acquires the working temperature of the vibration measurement probe;
s203, collecting the shaft seal pressure of the bearing at a pressure transmitter at a bearing shaft seal steam supply position;
s204, a generator set operation signal acquisition module acquires a generator set operation signal;
s205, an alarm signal acquisition module acquires an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system;
and S206, the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal.
The step identification is only used as a convenient identification, and in an actual process, S201 to S205 may be performed simultaneously or have another acquisition sequence.
Further, the comprehensive processing module judges whether to send out vibration high temperature early warning signal, vibration high temperature blocking signal or vibration blocking signal based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal, and specifically comprises:
a. the value of the learning confirmation coefficient is judged as follows:
wherein K represents a learning confirmation coefficient; r represents a unit operation signal, the unit operation is 1, and the unit non-operation is 0; s represents whether an alarm signal exists or not, the alarm is set to be 1, and the alarm is not set to be 0;
indicating that S is negated; t isHIndicating whether the working temperature exceeds a preset working temperature threshold value, and if so, taking 1, otherwise, taking 0; pHIndicating whether the shaft seal pressure exceeds a preset shaft seal pressure threshold value, and taking 1 if the shaft seal pressure exceeds the preset shaft seal pressure threshold value, or taking 0 if the shaft seal pressure does not exceed the preset shaft seal pressure threshold value; represents a logical AND;+ represents a logical or;
b. if the learning confirmation coefficient is 1, judging whether the vibration value exceeds a first preset vibration threshold value, if so, sending a vibration high-temperature early warning signal, and judging whether the vibration value exceeds a second preset vibration threshold value; if the vibration value exceeds a second preset vibration threshold value, a vibration high-temperature blocking signal with preset duration is sent out, and when the high-temperature blocking signal is sent out, the vibration value cannot send out a unit vibration blocking signal even if the vibration value exceeds the vibration blocking value; and if the vibration value still exceeds a second preset vibration threshold value and reaches a vibration interruption value after the preset time length, sending a vibration interruption signal.
In a vibration protection method with high temperature blocking, the same vibration protection system with high temperature blocking is specifically set for the method and parameters, and the embodiment will not be described repeatedly.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (7)
1. A vibration protection system with high temperature blocking, comprising: the device comprises a vibration measuring probe, a vibration measuring probe protection box, a temperature detection module, a pressure transmitter, a unit operation signal acquisition module, an alarm signal acquisition module and a comprehensive processing module; the vibration measuring probe is used for acquiring a vibration value of a turbine bearing of the generator set, and the vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe; the temperature detection module is arranged on the vibration measuring probe protection box to acquire the working temperature of the vibration measuring probe; the pressure transmitter is arranged at the bearing shaft seal steam supply position to acquire the shaft seal pressure of the bearing; the unit operation signal acquisition module is used for acquiring a generator set operation signal; the alarm signal acquisition module is used for acquiring an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system; the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal;
the temperature detection module comprises a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor is arranged at the inner bottom of the vibration measurement probe protection box; the second temperature sensor is arranged on the inner side surface, close to the heat source, of the vibration measurement probe protection box; the third temperature sensor is arranged on the outer side surface, close to the heat source, of the vibration measurement probe protection box;
the comprehensive processing module judges whether to send out vibration high temperature early warning signal, vibration high temperature blocking signal or vibration blocking signal based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal, and specifically comprises:
a. the value of the learning confirmation coefficient is judged as follows:
wherein K represents a learning confirmation coefficient; r represents a unit operation signal, the unit operation is 1, and the unit non-operation is 0; s represents whether an alarm signal exists or not, the alarm is set to be 1, and the alarm is not set to be 0;
indicating that S is negated; t isHIndicating whether the working temperature exceeds a preset working temperature threshold value, and if so, taking 1, otherwise, taking 0; pHIndicating whether the shaft seal pressure exceeds a preset shaft seal pressure threshold value, and taking 1 if the shaft seal pressure exceeds the preset shaft seal pressure threshold value, or taking 0 if the shaft seal pressure does not exceed the preset shaft seal pressure threshold value; represents a logical AND; + represents a logical or;
b. if the learning confirmation coefficient is 1, judging whether the vibration value exceeds a first preset vibration threshold value, if so, sending a vibration high-temperature early warning signal, and judging whether the vibration value exceeds a second preset vibration threshold value; if the vibration value exceeds a second preset vibration threshold value, a vibration high-temperature blocking signal with preset duration is sent out, and when the high-temperature blocking signal is sent out, the vibration value cannot send out a unit vibration blocking signal even if the vibration value exceeds the vibration blocking value; and if the vibration value still exceeds a second preset vibration threshold value and reaches a vibration interruption value after the preset time length, sending a vibration interruption signal.
2. The vibration protection system with high temperature block according to claim 1, wherein the T isHThe acquisition method comprises the following steps:
TH＝(TAH+TBH)·TCH
wherein, TAHWhether the temperature acquired by the first temperature sensor is greater than a first preset temperature threshold value is represented, 1 is exceeded, and otherwise 0 is obtained; TBHWhether the temperature acquired by the second temperature sensor is greater than a second preset temperature threshold value is represented, 1 is exceeded, and otherwise 0 is obtained; TC (tungsten carbide)HAnd indicating whether the temperature acquired by the third temperature sensor is greater than a third preset temperature threshold value, exceeding 1, and otherwise, taking 0.
3. The vibration protection system with high temperature block according to claim 2, wherein the first, second and third preset temperature thresholds are obtained by statistical analysis of historical collected data.
4. The vibration protection system with high temperature block according to claim 1, wherein the preset shaft seal pressure threshold is set to a pressure alarm value prescribed by a turbine generator set operation regulation.
5. The vibration protection system with high temperature block according to claim 1, wherein the method for obtaining the first preset vibration threshold value comprises:
comparing the vibration mutation value of the bearing with a vibration mutation initial estimation threshold, and if the vibration mutation value of the bearing is smaller than the vibration mutation initial estimation threshold in a learning period, setting the vibration mutation threshold as the vibration mutation initial estimation threshold minus a preset value; if the vibration mutation values of the bearings in one learning period are all larger than the vibration mutation initial estimation threshold value, setting the vibration mutation threshold value as the vibration mutation initial estimation threshold value plus a preset value; setting a vibration sudden change threshold as a vibration sudden change initial estimation threshold if the bearing vibration sudden change value fluctuates in a vibration sudden change initial estimation threshold interval within one learning period;
setting a vibration sudden change threshold value obtained after one or more learning periods as a first preset vibration threshold value;
the bearing vibration variation value is set to be PHThe maximum value of the vibration value of the steam turbine bearing of the generator set within a time range before and after 1, or the sudden change value of the vibration of the bearing is set as THThe maximum value of the vibration value of the turbine bearing of the generator unit in a time range before and after 1.
6. The vibration protection system with high temperature block according to claim 1, wherein the method for obtaining the second preset vibration threshold value comprises:
and selecting a certain value between the first preset vibration threshold value and the vibration interruption value as a second preset vibration threshold value.
7. A method of vibration protection with high temperature blocking, comprising:
the vibration measuring probe acquires the vibration value of the steam turbine bearing of the generator set, and the vibration measuring probe protection box is arranged as a fixing device and an outer cover of the vibration measuring probe;
the temperature detection module arranged on the vibration measurement probe protection box acquires the working temperature of the vibration measurement probe;
a pressure transmitter arranged at a bearing shaft seal steam supply position collects the shaft seal pressure of a bearing;
the unit operation signal acquisition module acquires a generator set operation signal;
the alarm signal acquisition module acquires an alarm signal of the self-checking abnormity of the generator set turbine bearing vibration monitoring system;
the comprehensive processing module judges whether to send out a vibration high-temperature early warning signal, a vibration high-temperature blocking signal or a vibration blocking signal or not based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal;
the temperature detection module comprises a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor is arranged at the inner bottom of the vibration measurement probe protection box; the second temperature sensor is arranged on the inner side surface, close to the heat source, of the vibration measurement probe protection box; the third temperature sensor is arranged on the outer side surface, close to the heat source, of the vibration measurement probe protection box;
the comprehensive processing module judges whether to send out vibration high temperature early warning signal, vibration high temperature blocking signal or vibration blocking signal based on the vibration value, the working temperature, the shaft seal pressure, the unit operation signal and the alarm signal, and specifically comprises:
a. the value of the learning confirmation coefficient is judged as follows:
wherein K represents a learning confirmation coefficient; r represents a unit operation signal, the unit operation is 1, and the unit non-operation is 0; s represents whether an alarm signal exists or not, the alarm is set to be 1, and the alarm is not set to be 0;
indicating that S is negated; t isHIndicating whether the working temperature exceeds a preset working temperature threshold value, and if so, taking 1, otherwise, taking 0; pHIndicating whether the shaft seal pressure exceeds a preset shaft seal pressure threshold value, and taking 1 if the shaft seal pressure exceeds the preset shaft seal pressure threshold value, or taking 0 if the shaft seal pressure does not exceed the preset shaft seal pressure threshold value; represents a logical AND; + represents a logical or;
b. if the learning confirmation coefficient is 1, judging whether the vibration value exceeds a first preset vibration threshold value, if so, sending a vibration high-temperature early warning signal, and judging whether the vibration value exceeds a second preset vibration threshold value; if the vibration value exceeds a second preset vibration threshold value, a vibration high-temperature blocking signal with preset duration is sent out, and when the high-temperature blocking signal is sent out, the vibration value cannot send out a unit vibration blocking signal even if the vibration value exceeds the vibration blocking value; and if the vibration value still exceeds a second preset vibration threshold value and reaches a vibration interruption value after the preset time length, sending a vibration interruption signal.
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