Coal mill health monitoring, fault early warning and fault diagnosis method and device

Abstract

According to the coal mill health monitoring, fault early warning and fault diagnosis method and device, comprehensive monitoring of the running state of the coal mill and early fault early warning are achieved through combination of multi-parameter real-time monitoring and an intelligent diagnosis algorithm, various parameters such as vibration, temperature and pressure are collected, and the coal mill health monitoring, fault early warning and fault diagnosis method and device are obtained through spectral analysis and rule judgment. Various fault types such as oil system faults, bearing faults and grinding piece faults are accurately recognized, targeted processing suggestions are provided, and the operation reliability and maintenance efficiency of the coal mill are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fault monitoring, and in particular to a coal mill health monitoring, fault early warning and fault diagnosis method and device. BACKGROUND

[0002] The coal mill is the core equipment of the coal pulverizing system of a thermal power plant, and its operating state directly affects the safety and economy of the unit. In the prior art, coal mill fault diagnosis mainly relies on manual experience judgment and regular maintenance, and there are problems such as response lag and insufficient accuracy. Traditional monitoring systems can only provide simple parameter display, and lack intelligent fault early warning and diagnosis functions, making it difficult to discover and handle potential equipment faults in a timely manner. SUMMARY

[0003] The present application aims to provide a coal mill health monitoring, fault early warning and fault diagnosis method and device that overcomes the above problems or at least partially solves the above problems.

[0004] To achieve the above purpose, the technical solution of the present application is as follows:

[0005] One aspect of the present application provides a coal mill health monitoring, fault early warning and fault diagnosis method, comprising:

[0006] Obtaining coal mill operating parameter data and set parameter data;

[0007] Performing preset processing on the operating parameter data and the set parameter data;

[0008] Determining the fault type according to a preset rule;

[0009] Outputting a fault diagnosis result and a processing suggestion.

[0010] Optionally, the operating parameter data includes primary air flow, primary air temperature, primary air pressure, cold air door opening, hot air door opening, ventilation resistance, pulverizing output, coal mill inlet air temperature, coal mill outlet temperature, pulverizing output air volume, motor current, motor power, motor speed, reducer oil supply pressure, oil supply temperature, filter differential pressure, lubricating oil flow, loading oil pressure, dynamic separator speed, coal mill outlet pressure, coal feeder current, coal feeder power, coal feeder speed, sealing air pressure, bearing temperature, static pressure bearing oil pressure, dynamic separator outlet temperature, X / Y direction vibration signal and noise signal.

[0011] The set parameter data includes static pressure bearing low oil pressure set value, main bearing temperature high alarm set value, bearing vibration high alarm set value, coal mill outlet temperature high alarm set value, filter differential pressure high alarm or coal mill speed high alarm set value, coal mill coal level high alarm set value and coal mill coal level low alarm set value.

[0012] Optionally, the preset processing of the running parameter data and the setting parameter data comprises:

[0013] trend analysis on the running parameter data;

[0014] comparison of the running parameter data or data calculated from the running parameter data with the setting parameter data;

[0015] displacement spectrum analysis on the X / Y direction vibration signal.

[0016] Optionally, the preset processing of the running parameter data and the setting parameter data comprises:

[0017] judging whether the oil pressure of the hydrostatic bearing is lower than a low oil pressure limit value of the hydrostatic bearing;

[0018] judging whether the bearing temperature is higher than a high alarm limit value of the main bearing temperature;

[0019] judging whether the bearing vibration value is higher than a high alarm limit value of the bearing vibration;

[0020] judging whether the parameters of the coal mill during operation are mismatched;

[0021] judging whether the pressure difference between the primary air pressure and the sealing air pressure is reduced;

[0022] judging whether the outlet temperature of the coal mill is higher than a high alarm limit value of the outlet temperature of the coal mill;

[0023] judging whether the dynamic separator is faulty;

[0024] judging whether the coal mill is full of coal;

[0025] judging whether the coal mill is out of coal;

[0026] judging whether the coal mill is insufficient in output.

[0027] Optionally, the judging of the fault type according to the preset rule comprises:

[0028] if the oil pressure of the hydrostatic bearing is lower than the low oil pressure limit value of the hydrostatic bearing, it is judged that there is an oil system fault, and the oil system fault comprises an oil pump fault and an oil flow low fault;

[0029] if the bearing temperature is higher than the high alarm limit value of the main bearing temperature, it is judged that there is a lubricating oil system fault or a bearing lubrication fault;

[0030] If the X / Y direction vibration signal is subjected to frequency spectrum analysis, it is determined that there is a mill roller and millstone vibration fault if the vibration is higher than the bearing vibration high alarm setting value and there is abnormal noise;

[0031] If the primary air flow is too large and the primary air temperature is too low, it is determined that there is a parameter mismatch fault in the process of running the mill;

[0032] If the pressure difference between the primary air pressure and the sealing air pressure decreases, it is determined that there is a sealing system fault;

[0033] If the mill outlet temperature is higher than the mill outlet temperature high alarm setting value, it is determined that there is a mill cavity fault;

[0034] If the filter differential pressure is higher than the filter differential pressure high alarm or the motor speed is higher than the mill speed high alarm, or the mill output decreases, or it is determined that there is a dynamic separator clogging fault, the dynamic separator tripping or sticking or natural or ignition is determined according to the dynamic separator speed and the dynamic separator outlet temperature;

[0035] If the mill coal level is higher than the mill coal level high alarm setting value, it is determined that there is a mill full coal fault;

[0036] If the motor current suddenly drops and is lower than the mill coal level low alarm setting value, it is determined that there is a mill coal breakage fault;

[0037] If the motor rated power is small and the mill output decreases, it is determined that there is a mill output deficiency fault.

[0038] Optionally, the mill roller and millstone vibration fault includes:

[0039] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude>=first preset value and unstable, and the phase change in the preset time is <second preset value, accompanied by friction impact vibration, noise, it is determined that there is little or no coal in the millstone;

[0040] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude>=first preset value and unstable, and the phase change in the preset time is <second preset value, accompanied by friction impact vibration, noise, it is determined that the grinding part is damaged;

[0041] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude>=first preset value and unstable, and the phase change in the preset time is <second preset value, accompanied by friction impact vibration, noise, it is determined that there may be foreign matter in the grinding part;

[0042] If the displacement spectrum analysis, 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, the phase change within the preset time < second preset value, with step impact vibration, noise, determine the gap of the guide plate is large;

[0043] If the displacement spectrum analysis, 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, the phase change within the preset time < second preset value, with step impact vibration, noise, determine the gap of the guide plate is large;

[0044] If the displacement spectrum analysis, 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and stable, the phase change within the preset time < second preset value, determine the empty load vibration is large.

[0045] Optionally, when it is judged that the coal mill full coal fault exists, if the motor current increases, the pulverized coal output decreases, it is judged that the coal quality changes greatly, and the raw coal moisture is large; if the mill outlet temperature decreases, it is judged that the mill inlet air temperature is low; if the primary air flow decreases, it is judged that the air and coal quantity adjustment is improper, the air-coal ratio is out of adjustment, and the primary air quantity is too small; if the mill inlet and outlet pressure difference increases and the primary powder pipe pressure decreases, it is judged that the coal feeder control device fails; if the stone coal quantity of the coal mill increases and is accompanied by fine coal powder, it is judged that the stone coal hopper inlet is blocked or the slag is not discharged in time.

[0046] Optionally, when it is judged that the coal mill coal breakage fault exists, if the motor current decreases, it is judged that the coal feeding is less, the raw coal moisture is large, and the coal feeding pipe is blocked; if the primary air quantity increases, it is judged that the primary air quantity of the coal mill increases; if the mill outlet temperature increases, it is judged that the mill outlet temperature increases, and the cold air door is automatically opened.

[0047] Optionally, the output fault diagnosis result and processing suggestion include:

[0048] If it is an oil pump fault, output the information that the oil pump working current is low and the oil pump needs to be repaired;

[0049] If it is an oil flow low fault, output the information that the oil system pipeline and valve leak, ultrasonic flow measurement, pipeline dredging, and blockage leakage;

[0050] If it is a lubricating oil system fault, output the information that the lubricating oil quality is tested, oil is filtered and replaced;

[0051] If it is a bearing lubrication fault, output the information that the bearing bush is removed, the bush is burned, the machine is stopped, and the bush is turned over;

[0052] If the coal quantity in the grinding disc is relatively small or there is no coal, output the information that the coal feeding is adjusted;

[0053] If the grinding element is damaged, output the repair, replace the grinding element information;

[0054] If there may be foreign matter in the grinding element, output the check the machine, and remove the foreign matter information;

[0055] If the pressure of the grinding roller becomes larger during loading, or the accumulator fails, output the check, handle the grinding material or repair the accumulator information;

[0056] If the gap of the guide plate is large, output the hydraulic system during loading, the pull rod lateral movement is larger, replace or adjust the gap between the guide plates information;

[0057] If the empty load vibration is large, output the rotor imbalance, on-site dynamic balancing information;

[0058] If the mill parameters do not match during operation, output the adjustment of coal quantity, air quantity, and separator parameters;

[0059] If the sealing system fails, output the sealing air pipe damage or air leakage, replace or repair the sealing pipe information, or the filter at the inlet of the sealing fan is blocked, clean the filter information, or the sealing part loses its function, eliminate the sealing fan failure information;

[0060] If the mill cavity fails, output the mill outlet temperature is relatively high, stop the operation of the medium-speed mill, and input the fire-fighting steam in the system emergency information, or the coal in the raw coal bunker has started to burn, after extinguishing, the fire-fighting steam needs to be input information, or the residual coal powder is not cleaned up when the mill stops, the blasting device is restored, the medium-speed mill is ventilated and purged, and the actual situation is restored or reserved information;

[0061] If the dynamic separator fails to block, output the separator dynamic blade jam or the separator speed is too high or stalls, immediately reduce the load of the unit, slowly reduce the operating speed of the separator, and stop the mill for inspection if necessary information;

[0062] If the dynamic separator trips, output the intermediate point temperature set value is immediately reduced and maintained at the original value range information, or manually open the dynamic separator trip mill cold air regulating baffle, close the mill hot air regulating baffle information, or reduce the burner swing angle, increase the desuperheating water flow, and control the steam temperature information;

[0063] If the dynamic separator is jammed, output the check and clean the dynamic separator information;

[0064] If the dynamic separator is natural, on fire, output field fire, stop the power of the charged device, stop the coal mill ventilation, and check the coal mill top powder, check the coal mill powder leakage information;

[0065] If the coal quality changes greatly, the raw coal moisture is large, or the mill inlet air temperature is too low, output the increase in mill inlet and outlet temperature; and prevent the sudden blowing of coal powder in the mill into the furnace to cause the boiler and air pressure to rise suddenly information;

[0066] If the wind, coal quantity adjustment is improper, the wind coal ratio is out of adjustment, and the primary air quantity is too small, output the information of reducing the coal quantity and increasing the primary air quantity;

[0067] If the coal feeder control device fails, output the information of repairing the coal feeder;

[0068] If the stone coal hopper inlet is blocked or the slag is not discharged in time, output the information of increasing the stone coal discharge frequency;

[0069] If the coal feeding is less, the raw coal moisture is large, and the coal pipe is blocked, output the information of removing the automatic adjustment of the coal feeder, manually adjusting the coal quantity, or repairing the coal feeder, and starting the dredging machine to dredge the coal feeder information;

[0070] If the primary air quantity of the coal mill is increased, output the information of manually adjusting the wind coal ratio

[0071] If the mill outlet temperature increases, the cold air door automatically opens, output the information of removing the cold and hot air automatic, opening the cold air door, and closing the hot air door;

[0072] If the coal mill output is insufficient, output the information of large stone coal discharge amount of the coal mill, using qualified coal quality, and transforming the air ring; or output the information of using qualified coal quality, transforming the air ring, and adjusting the gap; or output the information of replacing the grinding parts, high-performance grinding roller and lining.

[0073] Another aspect of the present application provides a coal mill health monitoring, fault early warning and fault diagnosis device, comprising: a processor, a memory;

[0074] The memory is used for storing a computer program;

[0075] The processor is used for executing the coal mill health monitoring, fault early warning and fault diagnosis method as described above by calling the computer program.

[0076] It can be seen that the coal mill health monitoring, fault early warning and fault diagnosis method and device provided by the application realize comprehensive monitoring of the running state of the coal mill and early warning of faults by combining intelligent diagnosis algorithms with real-time monitoring of multiple parameters, collect multiple parameters such as vibration, temperature and pressure, accurately identify multiple fault types such as oil system faults, bearing faults and grinding parts faults through spectrum analysis and rule judgment, and provide targeted processing suggestions, thereby significantly improving the running reliability and maintenance efficiency of the coal mill. BRIEF DESCRIPTION OF DRAWINGS

[0077] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0078] Figure 1 The flowchart of the coal mill health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure.

[0079] Figure 2 The flowchart of the coal mill oil system and lubricating oil system health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure.

[0080] Figure 3 The flowchart of the coal mill grinding roller and grinding disc health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure.

[0081] Figure 4 The flowchart of the coal mill running parameter, sealing system and machine cavity health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure.

[0082] Figure 5 The flowchart of the coal mill rotating separator health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure.

[0083] Figure 6 The flowchart of the coal mill full coal health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure.

[0084] Figure 7 The flowchart of the coal mill coal cutting and output health monitoring, fault early warning and fault diagnosis method provided by the embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0085] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be thoroughly understood and fully conveyed to those skilled in the art.

[0086] Referring to Figures 1 to 7 The coal mill health monitoring, fault early warning and fault diagnosis method provided by the embodiments of the present application comprises:

[0087] S1, obtaining coal mill operating parameter data and set parameter data.

[0088] As an optional implementation of the embodiments of the present application, the operating parameter data comprises: primary air flow, primary air temperature, primary air pressure, cold air door opening, hot air door opening, ventilation resistance, pulverizing output, coal mill inlet air temperature, coal mill outlet temperature, pulverizing output air volume, motor current, motor power, motor speed, speed reducer oil supply pressure, oil supply temperature, filter differential pressure, lubricating oil flow, loading oil pressure, dynamic separator speed, coal mill outlet pressure, coal feeder current, coal feeder power, coal feeder speed, sealing air pressure, bearing temperature, static pressure bearing oil pressure, dynamic separator outlet temperature, X / Y direction vibration signal and noise signal; the set parameter data comprises: static pressure bearing low oil pressure setting value, main bearing temperature high alarm setting value, bearing vibration high alarm setting value, coal mill outlet temperature high alarm setting value, filter differential pressure high alarm or coal mill speed high alarm setting value, coal mill coal level high alarm setting value and coal mill coal level low alarm setting value.

[0089] Specifically, the present application sets sensors at various key positions, parameters can be obtained through the sensors, parameters can be input from the interface, and parameters can also be set through the system. When specifically implemented, the parameters that need to be accessed from the interface include:

[0090] 1. Primary air flow, temperature, pressure;

[0091] 2. Cold air door opening, hot air door opening;

[0092] 3. Ventilation resistance, pulverizing output, coal mill inlet air temperature, coal mill outlet temperature, pulverizing output air volume, motor current, power, speed, speed reducer oil supply pressure, oil supply temperature, speed reducer oil supply temperature, filter differential pressure, lubricating oil flow, loading oil pressure, dynamic separator speed, coal mill outlet pressure, coal feeder current, power, speed, sealing air pressure, bearing temperature, static pressure bearing oil pressure;

[0093] 4. Dynamic separator outlet temperature.

[0094] Parameters required to be input from sensors: X, Y direction vibration; noise.

[0095] Fixed value parameters required to be input manually: 1. low oil pressure fixed value of static pressure bearing; 2: high alarm fixed value of main bearing temperature; 3. high alarm fixed value of bearing vibration; 4. high alarm fixed value of mill outlet temperature; 5. high alarm fixed value of filter differential pressure or mill speed; 6. high alarm fixed value of mill coal level; 7. low alarm fixed value of mill coal level; 8. low alarm fixed value of mill coal level.

[0096] S2, preset processing is performed on the running parameter data and the setting parameter data.

[0097] As an optional implementation manner of the embodiment of the application, the preset processing performed on the running parameter data and the setting parameter data comprises:

[0098] trend analysis is performed on the running parameter data;

[0099] the running parameter data or data obtained by calculation on the running parameter data is compared with the setting parameter data;

[0100] displacement spectrum analysis is performed on the X / Y direction vibration signal.

[0101] Specifically, the trend analysis performed on the running parameter can know whether the running is normal, the comparison of the parameter value or the calculated data with the pre-set parameter can know whether a fault occurs, and the displacement spectrum analysis performed on the vibration signal can know whether a vibration fault occurs.

[0102] As an optional implementation manner of the embodiment of the application, the preset processing performed on the running parameter data and the setting parameter data comprises:

[0103] whether the oil pressure of the static pressure bearing is lower than the low oil pressure fixed value of the static pressure bearing is judged;

[0104] whether the bearing temperature is higher than the high alarm fixed value of the main bearing temperature is judged;

[0105] whether the bearing vibration value is higher than the high alarm fixed value of the bearing vibration is judged;

[0106] whether the parameters of the mill do not match in the running process is judged;

[0107] whether the pressure difference between the primary air pressure and the sealing air pressure is reduced is judged;

[0108] whether the mill outlet temperature is higher than the high alarm fixed value of the mill outlet temperature is judged;

[0109] whether a dynamic separator fault exists is judged;

[0110] whether a mill full-coal fault exists is judged;

[0111] determining whether there is a coal mill coal breakage fault;

[0112] determining whether there is a coal mill output deficiency fault.

[0113] Specifically, the present application can monitor the health status of the coal mill and determine whether there is a preset fault.

[0114] S3, determining the fault type according to a preset rule.

[0115] As an optional implementation of the embodiment of the present application, determining the fault type according to a preset rule includes:

[0116] If the static pressure bearing oil pressure is lower than the static pressure bearing low oil pressure setting value, it is determined that there is an oil system fault, and the oil system fault includes an oil pump fault and an oil flow low fault;

[0117] If the bearing temperature is higher than the main bearing temperature high alarm setting value, it is determined that there is a lubricating oil system fault or a bearing lubrication fault;

[0118] If the X / Y direction vibration signal is subjected to frequency spectrum analysis, it is determined that it is higher than the bearing vibration high alarm setting value and there is abnormal noise, and it is determined that there is a coal mill roller and disc vibration fault;

[0119] If the primary air flow is too large and the primary air temperature is too low, it is determined that there is a parameter mismatch fault in the process of running the coal mill;

[0120] If the pressure difference between the primary air pressure and the sealing air pressure decreases, it is determined that there is a sealing system fault;

[0121] If the coal mill outlet temperature is higher than the coal mill outlet temperature high alarm setting value, it is determined that there is a coal mill cavity fault;

[0122] If the filter differential pressure is higher than the filter differential pressure high alarm or the motor speed is higher than the coal mill speed high alarm, or the pulverized coal output decreases, or it is determined that there is a dynamic separator blockage fault, the dynamic separator tripping or jamming or natural or ignition is determined according to the dynamic separator speed and the dynamic separator outlet temperature;

[0123] If the coal mill coal level high alarm setting value is exceeded, it is determined that there is a coal mill full coal fault;

[0124] If the motor current suddenly drops and is lower than the coal mill coal level low alarm setting value, it is determined that there is a coal mill coal breakage fault;

[0125] If the motor rated power is small and the pulverized coal output decreases, it is determined that there is a coal mill output deficiency fault.

[0126] The coal mill roller and disc vibration fault includes:

[0127] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, phase change in preset time < second preset value, with friction impact vibration, noise, it is determined that the coal amount in the grinding disc is less or there is no coal;

[0128] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, phase change in preset time < second preset value, with friction impact vibration, noise, it is determined that the grinding part is damaged;

[0129] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, phase change in preset time < second preset value, with friction impact vibration, noise, it is determined that there may be foreign matter in the grinding part;

[0130] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, phase change in preset time < second preset value, with step impact vibration, noise, it is determined that the pressure of the grinding roller is large during loading, or the accumulator has a fault;

[0131] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and unstable, phase change in preset time < second preset value, with impact vibration, noise, it is determined that the gap of the guide plate is large;

[0132] If the displacement spectrum analysis is 1 times frequency amplitude / 2 times frequency amplitude >= first preset value, and stable, phase change in preset time < second preset value, it is determined that the no-load vibration is large.

[0133] If the motor current increases, the pulverizing output decreases when the full-coal fault of the coal mill is determined, it is determined that the coal quality changes greatly and the moisture of raw coal is large; if the outlet temperature of the coal mill decreases, it is determined that the inlet air temperature of the coal mill is low; if the primary air flow decreases, it is determined that the air and coal amount are not adjusted properly, the air-coal ratio is out of control, and the primary air amount is too small; if the pressure difference between the inlet and outlet of the coal mill increases and the primary powder pipe pressure decreases, it is determined that the coal feeder control device is faulty; if the stone coal amount of the coal mill increases and is accompanied by fine coal powder, it is determined that the stone coal hopper inlet is blocked or the slag is not discharged in time.

[0134] If the motor current decreases when the coal mill fault is determined, it is determined that the coal is less, the moisture of raw coal is large, and the coal pipe is blocked; if the primary air amount increases, it is determined that the primary air amount of the coal mill increases; if the outlet temperature of the coal mill increases, it is determined that the outlet temperature of the coal mill increases, and the cold air door is automatically opened.

[0135] Specifically, the present application can determine whether a preset fault exists according to parameter comparison or calculation.

[0136] S4, outputting the fault diagnosis result and the processing suggestion.

[0137] As an optional implementation of the embodiment of the present application, outputting the fault diagnosis result and the processing suggestion comprises:

[0138] If it is a fault of the oil pump, outputting information that the working current of the oil pump is low and repairing the oil pump;

[0139] If it is a fault of low oil flow, outputting information that the pipeline and valve of the oil system leak, ultrasonic flow measurement is performed, the pipeline is dredged, and the leakage is blocked;

[0140] If it is a fault of the lubricating oil system, outputting information that the quality of the lubricating oil is tested, oil is filtered, and oil is changed;

[0141] If it is a fault of bearing lubrication, outputting information that the bearing shell is separated, the bearing shell is burned, the machine is stopped, and the bearing shell is turned over;

[0142] If the amount of coal in the mill is relatively small or there is no coal, outputting information that the coal is adjusted;

[0143] If the milling part is damaged, outputting information that the milling part is repaired or replaced;

[0144] If there is a foreign matter in the milling part, outputting information that the machine is checked and the foreign matter is removed;

[0145] If the pressure of the milling roller is large during loading or the accumulator is faulty, outputting information that the milling material is checked and handled or the accumulator is repaired;

[0146] If the gap of the guide plate is large, outputting information that the amount of transverse movement of the pull rod of the hydraulic system during loading is large, the gap between the guide plates is adjusted or replaced;

[0147] If the idle vibration is large, outputting information that the rotor is unbalanced and the rotor is dynamically balanced on site;

[0148] If the parameters of the coal mill do not match during operation, outputting information that the amount of coal, the amount of air, and the parameters of the separator are adjusted;

[0149] If the sealing system is faulty, outputting information that the sealing air pipeline is damaged or leaks, the sealing pipeline is repaired or replaced, a filter at the inlet of the sealing fan is blocked, the filter is cleaned, or a sealing part loses its function and the fault of the sealing fan is eliminated;

[0150] If the mill cavity failure, output mill exit temperature is high, stop the operation of the medium speed mill, in the system emergency into the fire steam information or coal bunker kind of coal has begun to burn, after the fire extinguishing treatment, need to put into the fire steam information or stop grinding the remaining part of the coal powder can not clean up, will blast device to restore, to the medium speed mill ventilation and purge, combined with the actual situation to restore operation or leave as a spare information;

[0151] If the dynamic separator appears jam fault, output separator dynamic blade jam or separator speed is too high or stall, immediately reduce the load of the unit, slowly reduce the running speed of the separator, if necessary, need to stop the mill for inspection information;

[0152] If the dynamic separator tripping, output immediately reduce the intermediate point temperature set value, maintain at the original value range information, or manually open the dynamic separator tripping mill cold air regulation baffle, close the mill hot air regulation baffle information, or reduce the burner swing angle, increase the desuperheating water flow, control the steam temperature information;

[0153] If the dynamic separator jam, output check, clean the dynamic separator information;

[0154] If the dynamic separator natural, fire, output on-site fire extinguishing, power equipment, stop the mill ventilation, and check the mill top powder, check the mill powder leakage information;

[0155] If the coal quality changes greatly, the moisture content of raw coal is large or the mill inlet air temperature is too low, output the mill inlet and outlet temperature; And prevent the sudden blowing of coal powder into the furnace, causing the boiler and air pressure to rise information;

[0156] If the wind and coal quantity adjustment is improper, the wind coal ratio is out of adjustment, and the primary air quantity is too small, output the coal quantity, increase the primary air quantity information;

[0157] If the coal feeder control device fails, output repair the coal feeder information;

[0158] If the stone coal hopper inlet is blocked or the slag is not discharged in time, output the increase of stone coal discharge frequency information;

[0159] If the coal is less, the moisture content of raw coal is large, and the coal pipe is blocked, output the manual adjustment of the coal feeder information, or the coal feeder is faulty, repair the coal feeder, and start the dredging machine to dredge the coal feeder information;

[0160] If the primary air quantity of the mill increases, output manual adjustment of the air coal ratio information

[0161] If the mill outlet temperature increases, the cold air door automatically opens, output the cold and hot air automatic, open the cold air door, close the hot air door information;

[0162] If the output of the coal mill is insufficient, the output of the coal mill is large, the qualified coal quality is adopted, the information of the transformed air ring is transformed, or the output of the coal mill is large, the qualified coal quality is adopted, the information of the transformed air ring is transformed, or the output of the coal mill is large, the information of the transformed air ring is transformed.

[0163] Specifically, the present application can also output fault warning and fault diagnosis information in the case of determining the presence of a fault, thereby facilitating the corresponding maintenance of the coal mill by the maintenance personnel and improving the maintenance work efficiency.

[0164] The following fault diagnosis can be realized in the present application:

[0165] 1. Oil system fault diagnosis:

[0166] The static pressure bearing oil pressure is monitored, and an alarm is triggered when it is lower than the set threshold;

[0167] The oil pump working current is checked, and if it is low, it is determined that the oil pump is faulty, and the oil pump is recommended to be repaired;

[0168] If the oil pump current is normal, ultrasonic flow measurement is performed to determine whether there is pipeline leakage;

[0169] According to the diagnosis result, it is suggested to dredge the pipeline or block the leakage point.

[0170] 2. Abnormal vibration diagnosis:

[0171] The bearing vibration value is monitored, and an alarm is triggered when Vrms> 4.5mm / s or the shaft vibration peak value exceeds the threshold

[0172] Displacement spectrum analysis is performed:

[0173] If the 1x frequency / 2x frequency amplitude ratio is greater than or equal to 9 and unstable, the phase change is less than 300°, and there is friction impact vibration:

[0174] Check the amount of coal on the grinding disc, and adjust the coal supply if it is insufficient

[0175] Check the state of the grinding part, and replace it if it is damaged

[0176] Check whether there is foreign matter and remove it

[0177] If the vibration is stable and the characteristic frequency is obvious, it is determined that the rotor is unbalanced, and on-site dynamic balancing is recommended

[0178] 3. Dynamic separator fault handling:

[0179] The separator speed and current are monitored:

[0180] If the current is 0 and the speed is 0, it is determined that the separator is tripped

[0181] Immediately reduce the coal supply, adjust the damper opening

[0182] Control the main steam temperature, increase the flow of desuperheating water

[0183] If the current fluctuates frequently, it is determined that it is stuck, and it is recommended to clean the separator

[0184] The specific parameters, specific contents and specific diagnosis methods of the coal mill health monitoring, fault early warning and fault diagnosis method of the application can refer to Table 1 as follows:

[0185] Table 1

[0186]

[0187]

[0188]

[0189]

[0190] As can be seen, the coal mill health monitoring, fault early warning and fault diagnosis method provided by the embodiments of the application can solve the technical problems of low fault diagnosis efficiency, insufficient accuracy and response lag of the coal mill in the prior art, realize real-time monitoring and intelligent diagnosis of the running state of the coal mill, improve the accuracy of fault diagnosis through comprehensive analysis of multiple parameters, provide targeted fault handling suggestions, shorten the fault handling time, reduce unplanned downtime and improve the reliability of equipment operation.

[0191] Another aspect of the application also provides a coal mill health monitoring, fault early warning and fault diagnosis device, comprising: a processor, a memory;

[0192] The memory is used for storing a computer program.

[0193] The processor is used for executing the above-mentioned coal mill health monitoring, fault early warning and fault diagnosis method by calling the computer program.

[0194] As can be seen, the coal mill health monitoring, fault early warning and fault diagnosis device provided by the embodiments of the application can solve the technical problems of low fault diagnosis efficiency, insufficient accuracy and response lag of the coal mill in the prior art, realize real-time monitoring and intelligent diagnosis of the running state of the coal mill, improve the accuracy of fault diagnosis through comprehensive analysis of multiple parameters, provide targeted fault handling suggestions, shorten the fault handling time, reduce unplanned downtime and improve the reliability of equipment operation.

[0195] The above merely provides an example of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A method for health monitoring, fault early warning, and fault diagnosis of a coal mill, characterized in that, include: Obtain coal mill operating parameter data and set parameter data; The operating parameter data and the setting parameter data are pre-processed; Determine the fault type based on preset rules; Output fault diagnosis results and handling suggestions.

2. The method according to claim 1, characterized in that, The operating parameter data includes: primary air flow rate, primary air temperature, primary air pressure, cold air damper opening, hot air damper opening, ventilation resistance, pulverizing output, coal mill inlet air temperature, coal mill outlet temperature, pulverizing output air volume, motor current, motor power, motor speed, reducer oil supply pressure, oil supply temperature, filter differential pressure, lubricating oil flow rate, loading oil pressure, dynamic separator speed, coal mill outlet pressure, coal feeder current, coal feeder power, coal feeder speed, sealing air pressure, bearing temperature, hydrostatic bearing oil pressure, dynamic separator outlet temperature, X / Y direction vibration signal and noise signal; The set parameter data includes: low oil pressure setting value for hydrostatic bearing, high alarm setting value for main bearing temperature, high alarm setting value for bearing vibration, high alarm setting value for coal mill outlet temperature, high alarm setting value for filter differential pressure or high alarm setting value for coal mill speed, high alarm setting value for coal mill coal level, and low alarm setting value for coal mill coal level.

3. The method according to claim 2, characterized in that, The preset processing of the operating parameter data and the set parameter data includes: Perform trend analysis on the aforementioned operating parameter data; The operating parameter data or the data calculated from the operating parameter data is compared with the set parameter data; Displacement spectrum analysis was performed on the vibration signals in the X / Y directions.

4. The method according to claim 2, characterized in that, The preset processing of the operating parameter data and the set parameter data includes: Determine whether the oil pressure of the hydrostatic bearing is lower than the low oil pressure set value of the hydrostatic bearing; Determine whether the bearing temperature is higher than the high temperature alarm setpoint of the main bearing. Determine whether the bearing vibration value is higher than the high bearing vibration alarm setpoint. Determine whether there is parameter mismatch during the operation of the coal mill; Determine whether the pressure difference between the primary air pressure and the sealing air pressure decreases; Determine whether the outlet temperature of the coal mill is higher than the high alarm value for the outlet temperature of the coal mill. Determine if the dynamic separator malfunctions. Determine if there is a coal mill overfilling fault; Determine if there is a coal mill coal shortage fault; Determine if there is a problem with insufficient output from the coal mill.

5. The method according to claim 4, characterized in that, The step of determining the fault type according to preset rules includes: If the hydrostatic bearing oil pressure is lower than the hydrostatic bearing low oil pressure set value, it is determined that there is an oil system fault. The oil system fault includes oil pump fault and low oil flow fault. If the bearing temperature is higher than the high alarm value of the main bearing temperature, it is determined that there is a fault in the lubrication system or a bearing lubrication fault. If the X / Y direction vibration signal is analyzed by spectrum and it is found to be higher than the bearing vibration high alarm value and there is abnormal noise, it is determined that there is a vibration fault in the grinding roller and grinding disc of the coal mill. If the primary air flow rate is too high and the primary air temperature is too low, it is determined that there is a parameter mismatch fault in the operation of the coal mill. If the pressure difference between the primary air pressure and the sealing air pressure decreases, it is determined that there is a fault in the sealing system; If the outlet temperature of the coal mill is higher than the high alarm value of the coal mill outlet temperature, it is determined that there is a fault in the coal mill cavity; If the differential pressure of the filter is higher than the high alarm of the differential pressure of the filter, or the speed of the motor is higher than the high alarm of the speed of the coal mill, or the pulverizing output is reduced, or it is determined that there is a blockage fault in the dynamic separator, the dynamic separator is tripped, jammed, spontaneously combusted, or ignited based on the speed of the dynamic separator and the outlet temperature of the dynamic separator; If the coal level exceeds the high coal level alarm setpoint of the coal mill, it is determined that there is a coal mill full coal fault. If the motor current suddenly drops and falls below the low coal level alarm setting of the coal mill, it is determined that there is a coal mill coal shortage fault. If the rated power of the motor is low, the pulverizing output will decrease, indicating that there is a fault of insufficient output of the coal mill.

6. The method according to claim 5, characterized in that, The vibration faults of the coal mill grinding rollers and grinding discs include: If, during displacement spectrum analysis, the amplitude of the first harmonic / second harmonic is greater than or equal to the first preset value and is unstable, and the phase change within the preset time is less than the second preset value, accompanied by frictional impact vibration and noise, it is determined that there is relatively little coal or no coal in the grinding disc; If, during displacement spectrum analysis, the amplitude of the first harmonic / second harmonic is greater than or equal to the first preset value and is unstable, and the phase change within the preset time is less than the second preset value, accompanied by frictional impact vibration and noise, it is determined that the grinding part is damaged. If, during displacement spectrum analysis, the amplitude of the first harmonic / second harmonic is greater than or equal to the first preset value and is unstable, and the phase change within the preset time is less than the second preset value, accompanied by frictional impact vibration and noise, it is determined that there may be foreign matter inside the grinding part. If, during displacement spectrum analysis, the amplitude of the first harmonic / second harmonic is greater than or equal to the first preset value and is unstable, the phase change within the preset time is less than the second preset value, accompanied by step impact vibration and noise, it is determined that the pressure of the grinding roller increases during loading, or the accumulator malfunctions. If, during displacement spectrum analysis, the amplitude of the first harmonic / the amplitude of the second harmonic is greater than or equal to the first preset value and is unstable, and the phase change within the preset time is less than the second preset value, accompanied by impact vibration and noise, it is determined that the gap of the guide plate is large. If, during displacement spectrum analysis, the amplitude of the first harmonic / the amplitude of the second harmonic is greater than or equal to the first preset value and is stable, and the phase change within the preset time is less than the second preset value, it is determined that the unloaded vibration is large.

7. The method according to claim 6, characterized in that, When a coal mill full-coal fault is detected, if the motor current increases and the pulverizing output decreases, it indicates a significant change in coal quality and high moisture content in the raw coal; if the coal mill outlet temperature decreases, it indicates a low inlet air temperature; if the primary air flow rate decreases, it indicates improper adjustment of the air and coal flow rates, an imbalance in the air-to-coal ratio, and insufficient primary air flow; if the coal mill inlet-outlet pressure difference increases and the primary pulverizing pipe pressure decreases, it indicates a fault in the coal feeder control device; if the amount of coke and gravel in the coal mill increases and is accompanied by fine coal dust, it indicates a blockage at the coke hopper inlet or failure to discharge slag in a timely manner.

8. The method according to claim 7, characterized in that, When a coal mill coal shortage fault is detected, if the motor current decreases, it indicates insufficient coal supply, high moisture content in the raw coal, and blockage in the coal feed pipe; if the primary air volume increases, it indicates an increase in the primary air volume of the coal mill; if the coal mill outlet temperature increases, it indicates an increase in the coal mill outlet temperature, and the cold air damper automatically opens wider.

9. The method according to claim 8, characterized in that, The output fault diagnosis results and handling suggestions include: If the problem is with the oil pump, the output oil pump operating current is too low. Repair the oil pump. If the fault is low oil flow, it indicates a leak in the oil output system pipeline or valve. Perform ultrasonic flow measurement, clear the pipeline, and identify the leak. If the problem is a lubrication system malfunction, output information on lubrication quality testing, oil filtration, and oil change. If the problem is a bearing lubrication failure, the output shaft bearing will come off, the bearing will burn out, the machine will stop, and the bearing will be damaged. If there is little or no coal in the millstone, output information to adjust the coal feeding. If the grinding part is damaged, output information on repairing or replacing the grinding part. If there are foreign objects inside the grinding parts, output the message "Inspect the machine and remove the foreign objects". If the pressure on the grinding roller increases during loading, or if the accumulator malfunctions, check the output, process the abrasive, or repair the accumulator information. If the gap between the guide plates is large, the pull rod will move laterally during the loading process of the output hydraulic system. Replace or adjust the gap between the guide plates. If the no-load vibration is large, the output rotor is unbalanced, and on-site dynamic balancing information is required. If a parameter mismatch occurs during the operation of the coal mill, adjust the parameters of the coal quantity, air volume, and separator. If the problem is a sealing system malfunction, such as damage or leakage in the output sealing air duct, the sealing duct needs to be replaced or repaired. Alternatively, if the filter at the inlet of the sealing blower is clogged, the filter needs to be cleaned. Or, if the seals at the sealing parts have lost their function, the sealing blower malfunction information should be cleared. If the problem is a malfunction in the coal mill chamber, resulting in a high outlet temperature, stop the operation of the medium-speed mill. In case of an emergency, activate the fire-fighting steam system. Alternatively, if the coal in the raw coal bunker has started to spontaneously combust, activate the fire-fighting steam system after fire extinguishing. Or, if some residual coal dust was not cleaned up when the mill was stopped, restore the blasting device, ventilate and purge the medium-speed coal mill, and then resume operation based on the actual situation or keep it as a backup. If the dynamic separator experiences a blockage, such as jammed output separator blades, excessively high separator speed, or stall, immediately reduce the unit load and slowly decrease the separator's operating speed. If necessary, stop the coal mill for inspection. If the dynamic separator trips, the output should immediately reduce the intermediate point temperature setpoint to maintain it within the original range. Alternatively, the output can be manually opened to activate the cold air regulating damper of the coal mill that tripped the dynamic separator, or the hot air regulating damper of the coal mill can be closed. Or the burner swing angle can be reduced, the desuperheating water flow rate can be increased, and the steam temperature can be controlled. If the dynamic separator is stuck, check the output and clear the dynamic separator information. If the dynamic separator spontaneously combusts or catches fire, the following actions should be taken: fire extinguishing, power outage of live equipment, stopping ventilation of the coal mill, checking for dust accumulation at the top of the coal mill, and checking for coal mill dust leakage information. If the coal quality changes significantly, the raw coal has high moisture content, or the inlet air temperature of the coal mill is too low, the output should increase the mill inlet and outlet temperatures; and prevent pulverized coal from being suddenly blown into the furnace, causing a sudden increase in boiler and gas pressure. If the air and coal quantities are not properly adjusted, the air-coal ratio is out of balance, the primary air volume is too small, and the output should reduce the coal feed rate and increase the primary air volume. If the fault is in the coal feeder control device, output coal feeder repair information; If the inlet of the stone and coal hopper is blocked or slag is not discharged in time, information will be output indicating an increase in the number of stone and coal discharges. If the problem is insufficient coal feed, high moisture content in the raw coal, or blockage in the coal feeder pipe, disable the automatic adjustment of the coal feeder and manually adjust the coal feed information. Alternatively, if the coal feeder is malfunctioning, repair the coal feeder and start the unblocking machine to clear the coal feeder information. If the primary air volume of the coal mill is increased, information for manually adjusting the air-coal ratio will be output. If the outlet temperature of the coal mill increases, the cold air damper will automatically open wider, the output will deactivate the automatic hot and cold air function, and the cold air damper will be opened wider and the hot air damper will be closed. If the problem is insufficient output of the coal mill, resulting in a large amount of stone and coal discharged from the mill, use qualified coal and modify the air ring; or if the dynamic and static clearances inside the mill are too large, use qualified coal, modify the air ring, and adjust the clearances; or if the grinding parts are worn, replace the high-performance grinding rollers and liners.

10. A coal mill health monitoring, fault early warning, and fault diagnosis device, characterized in that, include: Processor, memory; The memory is used to store computer programs; The processor is configured to execute the coal mill health monitoring, fault early warning and fault diagnosis method as described in any one of claims 1 to 9 by calling the computer program.

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