Method and device for health monitoring, fault early warning and fault diagnosis of induced draft fan

Abstract

According to the induced draft fan health monitoring, fault early warning and fault diagnosis method and device, data monitoring can be carried out, the fault type can be determined according to the alarm type, then fault early warning and fault diagnosis are carried out, and the accuracy of early fault early warning and evaluation can be improved.

Description

Technical Field

[0001] The present invention relates to the field of computers, and in particular, to a method and device for health monitoring, fault warning and fault diagnosis of induced draft fans. Background Art

[0002] An induced draft fan is a device that generates negative pressure through the rotation of an impeller and then extracts air from a system (equipment). It is generally installed at the end of a boiler to extract hot flue gas from the furnace.

[0003] In the prior art, the operating conditions of an induced draft fan during operation can be achieved by using mature sensor technology to collect the state of targeted signals of the physical components in the module, and forming feedback on-site monitoring data in cooperation with wired or wireless communication technology, and using computer technology to form data comparison and alarms.

[0004] However, the existing monitoring technology solutions can only make direct judgments based on the set thresholds of each data for the massive on-site monitoring data to form alarm signals, unable to identify the underlying logical meaning of the alarm status, unable to form judgments on the overall operating condition stability and fault incidence rate of the induced draft fan group, and unable to effectively diagnose and evaluate potential faults during operation. Summary of the Invention

[0005] The present invention aims to provide a method and device for health monitoring, fault warning and fault diagnosis of induced draft fans that overcome the above problems or at least partially solve the above problems.

[0006] To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

[0007] One aspect of the present invention provides a method for health monitoring, fault warning and fault diagnosis of induced draft fans, including:

[0008] Determining the fault type according to the alarm type; wherein, the alarm type includes: abnormal oil temperature alarm in the lubricating oil tank, low oil level alarm in the lubricating oil tank, low lubricating oil pressure alarm, high bearing temperature alarm, large vibration alarm of the induced draft fan bearing, and large noise and large vibration alarm of the casing; the fault type includes: lubricating oil system fault, cooling water system fault, bearing lubrication fault, dynamic imbalance, vibration caused by insufficient foundation stiffness of the bearing seat, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, rotating stall and surge, and mechanical system fault;

[0009] Performing fault warning according to the determined fault type;

[0010] Generating a fault diagnosis plan according to the fault warning result.

[0011] Optionally, the determining the fault type according to the alarm type includes:

[0012] Determine that the fault type is a lubricating oil system fault based on the abnormal alarm of the oil temperature in the lubricating oil tank, the low oil level alarm of the lubricating oil tank, the low lubricating oil pressure alarm, and / or the high bearing temperature alarm;

[0013] Determine that the fault type is a cooling water system fault based on the abnormal alarm of the oil temperature in the lubricating oil tank and / or the high bearing temperature alarm;

[0014] Determine that the fault type is a bearing lubrication fault based on the high bearing temperature alarm;

[0015] Determine that the fault type is dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by rubbing between moving and static parts, abnormalities caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, and / or rotating stall and surging based on the large vibration alarm of the induced draft fan bearing;

[0016] Determine that the fault type is a mechanical system fault and an air flow system fault based on the large noise and large vibration alarm of the casing.

[0017] Optionally, the fault early warning according to the determined fault type includes:

[0018] The fault early warning according to the lubricating oil system fault includes: abnormal operation of the electric heater, cold injector not put into operation, lubricating oil pipeline blockage or low flow rate, deterioration of lubricating oil quality, lubricating oil pump failure, low lubricating oil flow rate, lubricating oil quality testing, and malfunction of the temperature control valve of the lubricating oil station;

[0019] The fault early warning according to the cooling water system fault includes: abnormal closed cooling water supply or cold oil pump failure and blockage or low flow rate of the closed cooling water pipeline;

[0020] The fault early warning according to the bearing lubrication fault includes: the bearing bush coming off or burning out;

[0021] The fault early warning according to dynamic unbalance includes: uneven wear or corrosion of the impeller or blades, uneven ash accumulation on the blades, wear-through of the blades resulting in uneven ash accumulation in the cavity, local high temperature of the main shaft causing shaft bending, cracking of the impeller, and loosening and falling off of the balance weight;

[0022] The fault early warning according to the vibration caused by insufficient stiffness of the bearing seat foundation includes: poor grouting of the bearing seat foundation, loose anchor bolts, loose gaskets, loose connection of the machine base, and low stiffness of the bearing seat;

[0023] The fault early warning according to the vibration caused by abnormal coupling includes: excessive coupling opening, excessive coupling concentricity, and coupling alignment not considering operation;

[0024] Fault warning based on vibration caused by static and dynamic friction includes: rubbing between the collector outlet and the impeller inlet, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing due to reduced stiffness of the body or base;

[0025] Fault warning based on abnormalities caused by rolling bearings includes: poor machining of the journal or shaft shoulder, bending of the journal, tilting of the bearing installation, non - coincidence of the bearing inner ring with the axis line after assembly, loosening of the fixed round nut of the rolling bearing, and wear of the balls or rollers;

[0026] Fault warning based on intermittent vibration caused by the corrosion of the air pre - heater includes: air pre - heater failure;

[0027] Fault warning based on rotating stall and surge includes: airflow system failure;

[0028] Fault warning based on mechanical system failure includes: loosening of appendages.

[0029] Optionally, the generation of a fault diagnosis plan based on the fault warning result includes:

[0030] When the fault warning result is that the electric heater operates abnormally, the generated fault diagnosis plan is: check and repair the electric heater;

[0031] When the fault warning result is that the cold oil cooler is not put into operation, the generated fault diagnosis plan is: put into operation the cold oil cooler;

[0032] When the fault warning result is that the lubricating oil pipeline is blocked or the flow rate is low, the generated fault diagnosis plan is: ultrasonic flow measurement or pipeline dredging;

[0033] When the fault warning result is that the quality of the lubricating oil deteriorates, the generated fault diagnosis plan is: lubricating oil quality testing, and filtering or changing the oil;

[0034] When the fault warning result is that the lubricating oil pump fails, the generated fault diagnosis plan is: the working current of the lubricating oil pump is low, and repair the lubricating oil pump;

[0035] When the fault warning result is that the lubricating oil flow rate is low, the generated fault diagnosis plan is: leakage in the hydraulic oil or lubricating oil system pipeline or valve, and ultrasonic flow measurement or pipeline dredging or leakage plugging;

[0036] When the fault warning result is that the temperature control door of the lubricating oil station malfunctions, the generated fault diagnosis plan is: the temperature control door of the lubricating oil station malfunctions, and check or repair the temperature control door;

[0037] When the fault result is abnormal closed - cooling water supply or cold oil pump failure, the generated fault diagnosis plan is: the working current of the cold oil pump is low, and repair the cold oil pump;

[0038] When the fault result is that the closed cooling water pipeline is blocked or the flow rate is low, the generated fault diagnosis plan is: ultrasonic flow measurement, and stop the machine to dredge the pipeline;

[0039] When the fault result is that the bearing bush is out of shape or burned out, the generated fault diagnosis plan is: stop the machine or turn over the bearing bush;

[0040] When the fault result is that the impeller or blade is unevenly worn or corroded, the generated fault diagnosis plan is: repair the impeller and blade, and conduct on-site dynamic balance tests;

[0041] When the fault result is that the blades are unevenly ash fouled, the generated fault diagnosis plan is: clean the blades, and conduct on-site dynamic balance tests;

[0042] When the fault result is that the blades are worn through, causing uneven ash fouling in the cavity, the generated fault diagnosis plan is: clean and repair the ash fouling in the cavity, and conduct on-site dynamic balance tests;

[0043] When the fault result is that the main shaft is locally overheated, causing the shaft to bend, the generated fault diagnosis plan is: straighten and repair the shaft, and conduct on-site dynamic balance tests;

[0044] When the fault result is that the impeller is cracked, the generated fault diagnosis plan is: repair the impeller, and conduct on-site dynamic balance tests;

[0045] When the fault result is that the balance weight is loose and falls off, the generated fault diagnosis plan is: check and repair, and conduct on-site dynamic balance tests;

[0046] When the fault result is that the grouting of the bearing seat foundation is poor, the generated fault diagnosis plan is: re-grout, and conduct on-site dynamic balance tests;

[0047] When the fault result is that the anchor bolts are loose, the generated fault diagnosis plan is: tighten the anchor bolts, and conduct on-site dynamic balance tests;

[0048] When the fault result is that the gasket is loose, the generated fault diagnosis plan is: adjust the gasket, and conduct on-site dynamic balance tests;

[0049] When the fault result is that the connection of the machine base is not firm, the generated fault diagnosis plan is: adjust the connection stiffness, and conduct on-site dynamic balance tests;

[0050] When the fault result is that the stiffness of the bearing seat is low, the generated fault diagnosis plan is: conduct on-site dynamic balance tests;

[0051] When the fault result is that the coupling opening exceeds the standard, the coupling concentricity exceeds the standard, or the coupling alignment does not consider operation, the generated fault diagnosis plan is: adjust the coupling, and conduct on-site dynamic balance tests;

[0052] When the fault results are rubbing between the collector outlet and the impeller inlet, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: adjust the clearance and the axis center, and conduct on-site dynamic balancing tests;

[0053] When the fault result is rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: strengthen the stiffness, and conduct on-site dynamic balancing tests;

[0054] When the fault result is poor machining of the journal or shaft shoulder platform, the generated fault diagnosis plan is: repair by the manufacturer;

[0055] When the fault result is journal bending, the generated fault diagnosis plan is: repair the journal;

[0056] When the fault result is inclined installation of the bearing, the generated fault diagnosis plan is: adjust the bearing;

[0057] When the fault result is that the inner ring of the bearing does not coincide with the axis center after assembly, the generated fault diagnosis plan is: replace the bearing;

[0058] When the fault result is loose fixing nut of the rolling bearing retaining ring, the generated fault diagnosis plan is: repair the bearing;

[0059] When the fault result is wear of the balls or rollers, the generated fault diagnosis plan is: replace the bearing;

[0060] When the fault result is air preheater failure, the generated fault diagnosis plan is: repair the air preheater, conduct flue gas analysis, and ash analysis;

[0061] When the fault result is air flow system failure, the generated fault diagnosis plan is: check whether the dampers are uniform, adjust the air pressure, adjust the load, modify the air duct, or add a sound insulation cover or shock absorber;

[0062] When the fault result is looseness of accessories, the generated fault diagnosis plan is: tighten the loose parts.

[0063] Optionally,

[0064] The dynamic unbalance is judged in the following way: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is stable, and the phase change within the preset time < the second preset value;

[0065] The vibration caused by insufficient stiffness of the bearing seat foundation is judged in the following way: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is unstable, the amplitude change of the fundamental frequency within the preset time > the third preset value, and the phase change < the second preset value;

[0066] The vibration caused by the abnormality of the coupling is judged in the following way: Through displacement spectrum analysis: the amplitude ratio of the second harmonic / the amplitude of the fundamental frequency >= the preset range and is stable, and the phase change within the preset time of the fundamental frequency < the second preset value;

[0067] The vibration caused by the dynamic and static friction is judged in the following way: the vibration displacement amplitude of the fundamental frequency is unstable and the amplitude change within the preset time > the fourth preset value, and the phase change within the preset time of the fundamental frequency < the second preset value;

[0068] The rotating stall and surge are judged in the following way: Through displacement spectrum analysis: it has the characteristics of mainly fundamental frequency + low-frequency beating vibration.

[0069] Another aspect of the present invention provides a forced draft fan health monitoring, fault warning and fault diagnosis device, including:

[0070] A determination module, used to determine the fault type according to the alarm type; wherein, the alarm type includes: abnormal oil temperature alarm in the lubricating oil tank, low oil level alarm in the lubricating oil tank, low lubricating oil pressure alarm, high bearing temperature alarm, large vibration of the forced draft fan bearing, and large noise and large vibration of the casing; the fault type includes: lubricating oil system fault, cooling water system fault, bearing lubrication fault, dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by coupling abnormality, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, rotating stall and surge, and mechanical system fault;

[0071] A warning module, used to perform fault warning according to the determined fault type;

[0072] A generation module, used to generate a fault diagnosis plan according to the fault warning result.

[0073] Optionally, the determination module determines the fault type according to the alarm type in the following way:

[0074] Determine that the fault type is a lubricating oil system fault according to the abnormal oil temperature alarm in the lubricating oil tank, the low oil level alarm in the lubricating oil tank, the low lubricating oil pressure alarm, and / or the high bearing temperature alarm;

[0075] Determine that the fault type is a cooling water system fault according to the abnormal oil temperature alarm in the lubricating oil tank and / or the high bearing temperature alarm;

[0076] Determine that the fault type is a bearing lubrication fault according to the high bearing temperature alarm;

[0077] Based on the alarm of excessive vibration of the induced draft fan bearing, the fault types are determined as dynamic unbalance, vibration caused by insufficient stiffness of the bearing pedestal foundation, vibration caused by abnormal coupling, vibration caused by rubbing between moving and static parts, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, and / or rotating stall and surge;

[0078] Based on the alarms of excessive noise and excessive vibration of the casing, the fault types are determined as mechanical system faults and air flow system faults.

[0079] Optionally, the early warning module conducts fault early warning according to the determined fault types in the following manner:

[0080] Conducting fault early warning according to the lubricating oil system fault includes: abnormal operation of the electric heater, cold injector not put into operation, lubricating oil pipeline blocked or flow rate too low, deterioration of lubricating oil quality, lubricating oil pump failure, low lubricating oil flow rate, lubricating oil quality testing, and malfunction of the temperature control valve of the lubricating oil station;

[0081] Conducting fault early warning according to the cooling water system fault includes: abnormal closed cooling water supply or cold oil pump failure, and blocked or low-flow closed cooling water pipeline;

[0082] Conducting fault early warning according to bearing lubrication fault includes: the bearing bush coming off or burning out;

[0083] Conducting fault early warning according to dynamic unbalance includes: uneven wear or corrosion of the impeller or blades, uneven ash accumulation on the blades, cavity uneven ash accumulation caused by the blade being worn through, local high temperature of the main shaft causing shaft bending, impeller cracking, and loosening and falling off of the balance weight;

[0084] Conducting fault early warning according to the vibration caused by insufficient stiffness of the bearing pedestal foundation includes: poor grouting of the bearing pedestal foundation, loose anchor bolts, loose gaskets, loose connection of the machine base, and low stiffness of the bearing pedestal;

[0085] Conducting fault early warning according to the vibration caused by abnormal coupling includes: excessive coupling opening, excessive coupling concentricity, and alignment not considering operation;

[0086] Conducting fault early warning according to the vibration caused by rubbing between moving and static parts includes: rubbing between the outlet of the collector and the inlet of the impeller, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing caused by reduced stiffness of the main body or pedestal;

[0087] Conducting fault early warning according to the abnormality caused by rolling bearings includes: poor machining of the journal or shaft shoulder platform, shaft neck bending, inclined bearing installation, non-coincidence of the inner ring of the bearing with the axis line after assembly, loose fixing nut of the rolling bearing, and wear of the balls or rollers;

[0088] Conducting fault early warning according to the intermittent vibration caused by corrosion of the air preheater includes: air preheater failure;

[0089] Fault warning based on rotating stall and surge includes: air flow system failure;

[0090] Fault warning based on mechanical system failure includes: looseness of appendages.

[0091] Optionally, the generation module generates a fault diagnosis plan according to the fault warning result in the following way:

[0092] When the fault warning result is that the electric heater operates abnormally, the generated fault diagnosis plan is: check and repair the electric heater;

[0093] When the fault warning result is that the cold oil cooler is not put into operation, the generated fault diagnosis plan is: put the cold oil cooler into operation;

[0094] When the fault warning result is that the lubricating oil pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement or pipeline dredging;

[0095] When the fault warning result is that the quality of the lubricating oil deteriorates, the generated fault diagnosis plan is: lubricating oil quality testing, and filtering or changing the lubricating oil;

[0096] When the fault warning result is that the lubricating oil pump fails, the generated fault diagnosis plan is: the working current of the lubricating oil pump is too low, and repair the lubricating oil pump;

[0097] When the fault warning result is that the flow rate of the lubricating oil is too low, the generated fault diagnosis plan is: leakage in the hydraulic oil or lubricating oil system pipeline or valve, and perform ultrasonic flow measurement or dredge the pipeline or block and leak;

[0098] When the fault warning result is that the temperature control valve of the lubricating oil station fails, the generated fault diagnosis plan is: the temperature control valve of the lubricating oil station fails, and check or repair the temperature control valve;

[0099] When the fault result is abnormal closed cooling water supply or cold oil pump failure, the generated fault diagnosis plan is: the working current of the cold oil pump is too low, and repair the cold oil pump;

[0100] When the fault result is that the closed cooling water pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement, and stop the machine to dredge the pipeline;

[0101] When the fault result is that the bearing shell is out of shape or burned out, the generated fault diagnosis plan is: stop the machine or turn over the bearing shell;

[0102] When the fault result is uneven wear or corrosion of the impeller or blade, the generated fault diagnosis plan is: repair the impeller and blade, and perform an on-site dynamic balance test;

[0103] When the fault result is uneven ash accumulation on the blade, the generated fault diagnosis plan is: clean the blade, and perform an on-site dynamic balance test;

[0104] When the fault result is uneven ash accumulation in the cavity due to blade wear-through, the generated fault diagnosis plan is: clean the ash accumulation in the cavity and repair it, and conduct an on-site dynamic balance test;

[0105] When the fault result is shaft bending caused by local high temperature of the main shaft, the generated fault diagnosis plan is: straighten the shaft and repair it, and conduct an on-site dynamic balance test;

[0106] When the fault result is impeller cracking, the generated fault diagnosis plan is: repair the impeller and conduct an on-site dynamic balance test;

[0107] When the fault result is the loosening and falling off of the balance weight, the generated fault diagnosis plan is: check and repair it, and conduct an on-site dynamic balance test;

[0108] When the fault result is poor grouting of the bearing seat foundation, the generated fault diagnosis plan is: re-grout and conduct an on-site dynamic balance test;

[0109] When the fault result is loose anchor bolts, the generated fault diagnosis plan is: tighten the anchor bolts and conduct an on-site dynamic balance test;

[0110] When the fault result is loose gaskets, the generated fault diagnosis plan is: adjust the gaskets and conduct an on-site dynamic balance test;

[0111] When the fault result is loose connection of the machine base, the generated fault diagnosis plan is: adjust the connection stiffness and conduct an on-site dynamic balance test;

[0112] When the fault result is low stiffness of the bearing seat, the generated fault diagnosis plan is: conduct an on-site dynamic balance test;

[0113] When the fault results are excessive coupling opening, excessive coupling concentricity, and the coupling alignment not considering operation, the generated fault diagnosis plan is: adjust the coupling and conduct an on-site dynamic balance test;

[0114] When the fault results are rubbing between the outlet of the collector and the inlet of the impeller, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing due to reduced stiffness of the body or pedestal, the generated fault diagnosis plan is: adjust the clearance and the axis center, and conduct an on-site dynamic balance test;

[0115] When the fault result is rubbing due to reduced stiffness of the body or pedestal, the generated fault diagnosis plan is: strengthen the stiffness and conduct an on-site dynamic balance test;

[0116] When the fault result is poor machining of the journal or shaft shoulder, the generated fault diagnosis plan is: repair by the manufacturer;

[0117] When the fault result is journal bending, the generated fault diagnosis plan is: repair the journal;

[0118] When the fault result is that the bearing is installed obliquely, the generated fault diagnosis plan is: adjust the bearing;

[0119] When the fault result is that the inner ring of the bearing is not coincident with the axis line after assembly, the generated fault diagnosis plan is: replace the bearing;

[0120] When the fault result is that the fixing nut of the rolling bearing is loose, the generated fault diagnosis plan is: repair the bearing;

[0121] When the fault result is that the ball or roller is worn, the generated fault diagnosis plan is: replace the bearing;

[0122] When the fault result is an air preheater fault, the generated fault diagnosis plan is: repair the air preheater, conduct flue gas analysis and ash analysis;

[0123] When the fault result is an air flow system fault, the generated fault diagnosis plan is: check whether the dampers are uniform, adjust the air pressure, adjust the load, modify the air duct or add a sound insulation cover or shock absorber;

[0124] When the fault result is that the accessories are loose, the generated fault diagnosis plan is: tighten the loose parts.

[0125] Optionally, the dynamic unbalance is judged in the following way: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is stable, and the phase change within the preset time < the second preset value;

[0126] The vibration caused by insufficient stiffness of the bearing seat foundation is judged in the following way: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is unstable, the amplitude change of the fundamental frequency within the preset time > the third preset value, and the phase change < the second preset value;

[0127] The vibration caused by abnormal coupling is judged in the following way: through displacement spectrum analysis: the amplitude of the second harmonic frequency / the amplitude of the fundamental frequency >= the preset range, and it is stable, and the phase change of the fundamental frequency within the preset time < the second preset value;

[0128] The vibration caused by rubbing between the moving and static parts is judged in the following way: the vibration displacement amplitude of the fundamental frequency is unstable and the amplitude change within the preset time > the fourth preset value, and the phase change of the fundamental frequency within the preset time < the second preset value;

[0129] The rotating stall and surge are judged in the following way: through displacement spectrum analysis: having the characteristics of mainly fundamental frequency + low-frequency beating vibration.

[0130] It can be seen that through the induced draft fan health monitoring, fault warning and fault diagnosis method and device provided by the present invention, data monitoring can be carried out, the fault type can be determined according to the alarm type, and then fault warning and fault diagnosis can be carried out, which can improve the accuracy of early fault warning and evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0131] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative work.

[0132] Figure 1 is a flowchart of the induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiment of the present invention;

[0133] Figure 2 is a partial flowchart of the specific application of an induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiment of the present invention;

[0134] Figure 3 is another partial flowchart of the specific application of an induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiment of the present invention;

[0135] Figure 4 is yet another partial flowchart of the specific application of an induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiment of the present invention;

[0136] Figure 5 is a structural schematic diagram of the induced draft fan health monitoring, fault warning and fault diagnosis device provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0137] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0138] Figure 1 shows a flowchart of the induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiment of the present invention. Refer to Figure 1 , the induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiment of the present invention includes:

[0139] S1. Determine the fault type according to the alarm type. Among them, the alarm type includes: abnormal oil temperature alarm in the lubricating oil tank, low oil level alarm in the lubricating oil tank, low lubricating oil pressure alarm, high bearing temperature alarm, large vibration alarm of the induced draft fan bearing, and large noise and large vibration alarm of the casing. The fault type includes: lubricating oil system fault, cooling water system fault, bearing lubrication fault, dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, rotating stall and surge, and mechanical system fault.

[0140] S2. Conduct fault early warning according to the determined fault type.

[0141] S3. Generate a fault diagnosis plan according to the fault early warning result.

[0142] Specifically, the present invention can realize data acquisition through the interface input parameters and sensor input parameters shown in Table 1, and then obtain the alarm information and the alarm type.

[0143] Table 1

[0144]

[0145]

[0146] The following combines Figures 2 to 4 , and elaborates on the present invention in detail:

[0147] As an optional implementation manner of an embodiment of the present invention, the determining the fault type according to the alarm type includes:

[0148] Determine that the fault type is a lubricating oil system fault according to the abnormal oil temperature alarm in the lubricating oil tank, the low oil level alarm in the lubricating oil tank, the low lubricating oil pressure alarm, and / or the high bearing temperature alarm;

[0149] Determine that the fault type is a cooling water system fault according to the abnormal oil temperature alarm in the lubricating oil tank and / or the high bearing temperature alarm;

[0150] Determine that the fault type is a bearing lubrication fault according to the high bearing temperature alarm;

[0151] Determine that the fault type is dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, and / or rotating stall and surge according to the large vibration alarm of the induced draft fan bearing;

[0152] Determine that the fault type is a mechanical system fault and an air flow system fault according to the large noise and large vibration alarm of the casing.

[0153] As an alternative implementation of the embodiment of the present invention, the fault warning according to the determined fault type includes:

[0154] The fault warning according to the lubricating oil system fault includes: abnormal operation of the electric heater, cold injector not put into operation, lubricating oil pipeline blockage or low flow rate, deterioration of lubricating oil quality, lubricating oil pump fault, low lubricating oil flow rate, lubricating oil quality testing, and malfunction of the temperature control valve of the lubricating oil station;

[0155] The fault warning according to the cooling water system fault includes: abnormal closed cooling water supply or cold oil pump fault, and blockage or low flow rate of the closed cooling water pipeline;

[0156] The fault warning according to the bearing lubrication fault includes: the bearing bush coming off or burning out;

[0157] The fault warning according to dynamic unbalance includes: uneven wear or corrosion of the impeller or blade, uneven ash accumulation on the blade, uneven ash accumulation in the cavity due to the blade being worn through, local high temperature of the main shaft causing shaft bending, impeller cracking, and loosening and falling off of the balance weight;

[0158] The fault warning according to the vibration caused by insufficient rigidity of the bearing seat foundation includes: poor grouting of the bearing seat foundation, loose anchor bolts, loose gaskets, loose connection of the machine base, and low rigidity of the bearing seat;

[0159] The fault warning according to the vibration caused by abnormal coupling includes: excessive coupling opening, excessive coupling concentricity, and coupling alignment not considering operation;

[0160] The fault warning according to the vibration caused by rubbing between the moving and static parts includes: rubbing between the outlet of the collector and the inlet of the impeller, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing due to the reduction of the rigidity of the body or the base;

[0161] The fault warning according to the abnormality caused by the rolling bearing includes: poor machining of the journal or shaft shoulder, shaft neck bending, inclined bearing installation, non - coincidence of the inner ring of the bearing with the axis line after assembly, loose fixing nut of the rolling bearing, and wear of the ball or roller;

[0162] The fault warning according to the intermittent vibration caused by the corrosion of the air preheater includes: air preheater fault;

[0163] The fault warning according to rotating stall and surge includes: air flow system fault;

[0164] The fault warning according to the mechanical system fault includes: loosening of appendages.

[0165] As an alternative implementation of the embodiment of the present invention, the generation of the fault diagnosis plan according to the fault warning result includes:

[0166] When the fault warning result is that the electric heater is operating abnormally, the generated fault diagnosis plan is: check and repair the electric heater;

[0167] When the fault warning result is that the cold oil injector is not put into operation, the generated fault diagnosis plan is: put the cold oil cooler into operation;

[0168] When the fault warning result is that the lubricating oil pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement or pipeline dredging;

[0169] When the fault warning result is that the quality of the lubricating oil deteriorates, the generated fault diagnosis plan is: lubricating oil quality testing, and filter or change the lubricating oil;

[0170] When the fault warning result is that the lubricating oil pump fails, the generated fault diagnosis plan is: the working current of the lubricating oil pump is too low, and repair the lubricating oil pump;

[0171] When the fault warning result is that the lubricating oil flow rate is too low, the generated fault diagnosis plan is: hydraulic oil or lubricating oil system pipeline or valve leakage, and ultrasonic flow measurement or pipeline dredging or leakage plugging;

[0172] When the fault warning result is that the temperature control valve of the lubricating oil station fails, the generated fault diagnosis plan is: the temperature control valve of the lubricating oil station fails, and check or repair the temperature control valve;

[0173] When the fault result is that the closed cooling water supply is abnormal or the cold oil pump fails, the generated fault diagnosis plan is: the working current of the cold oil pump is too low, and repair the cold oil pump;

[0174] When the fault result is that the closed cooling water pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement, and stop the machine to dredge the pipeline;

[0175] When the fault result is that the bearing bush is out of shape or burned out, the generated fault diagnosis plan is: stop the machine or turn over the bearing bush;

[0176] When the fault result is that the impeller or blade is unevenly worn or corroded, the generated fault diagnosis plan is: repair the impeller and blade, and conduct an on-site dynamic balance test;

[0177] When the fault result is that the blade ash accumulation is uneven, the generated fault diagnosis plan is: clean the blade, and conduct an on-site dynamic balance test;

[0178] When the fault result is that the blade is worn through, resulting in uneven ash accumulation in the cavity, the generated fault diagnosis plan is: clean and repair the cavity ash accumulation, and conduct an on-site dynamic balance test;

[0179] When the fault result is that the main shaft is locally overheated, causing the shaft to bend, the generated fault diagnosis plan is: straighten and repair the shaft, and conduct an on-site dynamic balance test;

[0180] When the failure result is that the impeller cracks, the generated fault diagnosis plan is: repair the impeller and conduct an on-site dynamic balance test;

[0181] When the failure result is that the balance weight loosens and falls off, the generated fault diagnosis plan is: check and repair, and conduct an on-site dynamic balance test;

[0182] When the failure result is that the grouting of the bearing seat foundation is poor, the generated fault diagnosis plan is: re-grout and conduct an on-site dynamic balance test;

[0183] When the failure result is that the anchor bolts are loose, the generated fault diagnosis plan is: tighten the anchor bolts and conduct an on-site dynamic balance test;

[0184] When the failure result is that the gasket is loose, the generated fault diagnosis plan is: adjust the gasket and conduct an on-site dynamic balance test;

[0185] When the failure result is that the connection of the machine base is not firm, the generated fault diagnosis plan is: adjust the connection stiffness and conduct an on-site dynamic balance test;

[0186] When the failure result is that the stiffness of the bearing seat is low, the generated fault diagnosis plan is: conduct an on-site dynamic balance test;

[0187] When the failure results are that the coupling opening exceeds the standard, the coupling concentricity exceeds the standard, and the coupling alignment does not consider operation, the generated fault diagnosis plan is: adjust the coupling and conduct an on-site dynamic balance test;

[0188] When the failure results are that there is rubbing between the outlet of the collector and the inlet of the impeller, between the impeller and the casing, between the main shaft and the seal, and between the body or the base with reduced stiffness, the generated fault diagnosis plan is: adjust the clearance and the axis center, and conduct an on-site dynamic balance test;

[0189] When the failure result is that there is rubbing due to the reduced stiffness of the body or the base, the generated fault diagnosis plan is: strengthen the stiffness and conduct an on-site dynamic balance test;

[0190] When the failure result is that the machining of the journal or the shaft shoulder is poor, the generated fault diagnosis plan is: repair by the manufacturer;

[0191] When the failure result is that the journal is bent, the generated fault diagnosis plan is: repair the journal;

[0192] When the failure result is that the bearing is installed obliquely, the generated fault diagnosis plan is: adjust the bearing;

[0193] When the failure result is that the inner ring of the bearing does not coincide with the axis center after assembly, the generated fault diagnosis plan is: replace the bearing;

[0194] When the failure result is that the fixing nut of the rolling bearing is loose, the generated fault diagnosis plan is: repair the bearing;

[0195] When the failure result is that the ball or roller is worn, the generated fault diagnosis plan is: replace the bearing;

[0196] When the failure result is an air preheater failure, the generated fault diagnosis plan is: repair the air preheater, conduct flue gas analysis, and ash analysis;

[0197] When the failure result is an air flow system failure, the generated fault diagnosis plan is: check whether the air dampers are uniform, adjust the air pressure, adjust the load, modify the air duct, or add a sound insulation cover or shock absorber;

[0198] When the failure result is that the accessories are loose, the generated fault diagnosis plan is: tighten the loose components.

[0199] As an optional implementation manner of the embodiment of the present invention, the dynamic unbalance is judged in the following manner: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is stable, and the phase change within the preset time < the second preset value;

[0200] The vibration caused by insufficient stiffness of the bearing seat foundation is judged in the following manner: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is unstable, the amplitude change of the fundamental frequency within the preset time > the third preset value, and the phase change < the second preset value;

[0201] The vibration caused by the abnormal coupling is judged in the following manner: through displacement spectrum analysis: the amplitude of the second harmonic frequency / the amplitude of the fundamental frequency >= the preset range, and it is stable, and the phase change of the fundamental frequency within the preset time < the second preset value;

[0202] The vibration caused by the dynamic and static friction is judged in the following manner: the vibration displacement amplitude of the fundamental frequency is unstable and the amplitude change within the preset time > the fourth preset value, and the phase change of the fundamental frequency within the preset time < the second preset value;

[0203] The rotating stall and surge are judged in the following manner: through displacement spectrum analysis: having the characteristics of mainly fundamental frequency + low-frequency beat vibration.

[0204] The following summarizes the induced draft fan health monitoring, fault warning and fault diagnosis methods provided by the embodiments of the present invention through Table 2:

[0205] Table 2

[0206]

[0207]

[0208]

[0209]

[0210] It can be seen that through the induced draft fan health monitoring, fault warning and fault diagnosis method provided by the embodiments of the present invention, data monitoring can be carried out, the fault type can be determined according to the alarm type, and then fault warning and fault diagnosis can be carried out, which can improve the accuracy of early fault warning and assessment.

[0211] Figure 5 The structural schematic diagram of the induced draft fan health monitoring, fault warning and fault diagnosis device provided by the embodiments of the present invention is shown. This induced draft fan health monitoring, fault warning and fault diagnosis device applies the above method. Only a simple description of the structure of the induced draft fan health monitoring, fault warning and fault diagnosis device is given below. For other matters not covered, please refer to the relevant descriptions in the above induced draft fan health monitoring, fault warning and fault diagnosis method. See Figure 5 The induced draft fan health monitoring, fault warning and fault diagnosis device provided by the embodiments of the present invention includes:

[0212] A determination module, configured to determine the fault type according to the alarm type; wherein, the alarm type includes: abnormal oil temperature alarm in the lubricating oil tank, low oil level alarm in the lubricating oil tank, low lubricating oil pressure alarm, high bearing temperature alarm, large vibration alarm of the induced draft fan bearing, and large noise and large vibration alarm of the casing; the fault type includes: lubricating oil system fault, cooling water system fault, bearing lubrication fault, dynamic unbalance, vibration caused by insufficient foundation stiffness of the bearing seat, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, rotating stall and surging, and mechanical system fault;

[0213] A warning module, configured to perform fault warning according to the determined fault type;

[0214] A generation module, configured to generate a fault diagnosis plan according to the fault warning result.

[0215] As an optional implementation manner of the embodiments of the present invention, the determination module determines the fault type according to the alarm type in the following manner:

[0216] Determine that the fault type is a lubricating oil system fault according to the abnormal oil temperature alarm in the lubricating oil tank, the low oil level alarm in the lubricating oil tank, the low lubricating oil pressure alarm, and / or the high bearing temperature alarm;

[0217] Determine that the fault type is a cooling water system fault according to the abnormal oil temperature alarm in the lubricating oil tank and / or the high bearing temperature alarm;

[0218] Determine that the fault type is a bearing lubrication fault according to the high bearing temperature alarm;

[0219] Based on the large vibration alarm of the induced draft fan bearing, the fault types are determined as dynamic unbalance, vibration caused by insufficient foundation stiffness of the bearing seat, vibration caused by abnormal coupling, vibration caused by rubbing between moving and stationary parts, abnormalities caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, and / or rotating stall and surging;

[0220] Based on the large noise and large vibration alarm of the casing, the fault types are determined as mechanical system faults and air flow system faults.

[0221] As an optional implementation manner of the embodiment of the present invention, the early warning module performs fault early warning according to the determined fault types in the following manner:

[0222] Performing fault early warning according to the lubricating oil system fault includes: abnormal operation of the electric heater, cold injector not put into operation, lubricating oil pipeline blockage or low flow rate, deterioration of lubricating oil quality, lubricating oil pump fault, low lubricating oil flow rate, lubricating oil quality testing, and malfunction of the temperature control valve of the lubricating oil station;

[0223] Performing fault early warning according to the cooling water system fault includes: abnormal closed cooling water supply or cold oil pump fault, and blockage or low flow rate of the closed cooling water pipeline;

[0224] Performing fault early warning according to the bearing lubrication fault includes: the bearing bush coming off or burning out;

[0225] Performing fault early warning according to dynamic unbalance includes: uneven wear or corrosion of the impeller or blade, uneven ash accumulation on the blade, cavity uneven ash accumulation caused by the blade being worn through, shaft bending caused by local high temperature of the main shaft, impeller cracking, and loosening and falling off of the balance weight;

[0226] Performing fault early warning according to the vibration caused by insufficient foundation stiffness of the bearing seat includes: poor grouting of the bearing seat foundation, loose anchor bolts, loose gaskets, loose connection of the machine base, and low stiffness of the bearing seat;

[0227] Performing fault early warning according to the vibration caused by abnormal coupling includes: excessive coupling opening, excessive coupling concentricity, and coupling alignment not considering operation;

[0228] Performing fault early warning according to the vibration caused by rubbing between moving and stationary parts includes: rubbing between the outlet of the collector and the inlet of the impeller, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing caused by the reduction of the stiffness of the main body or the base;

[0229] Performing fault early warning according to the abnormalities caused by rolling bearings includes: poor machining of the journal or shaft shoulder platform, shaft neck bending, bearing installation inclination, non - coincidence of the inner ring of the bearing with the axis line after assembly, loosening of the fixed round nut of the rolling bearing, and wear of the ball or roller;

[0230] Performing fault early warning according to the intermittent vibration caused by corrosion of the air preheater includes: air preheater fault;

[0231] Fault warning based on rotating stall and surge includes: airflow system failure;

[0232] Fault warning based on mechanical system failure includes: looseness of appendages.

[0233] As an alternative implementation of the embodiment of the present invention, the generating module generates a fault diagnosis plan according to the fault warning result in the following manner:

[0234] When the fault warning result is that the electric heater operates abnormally, the generated fault diagnosis plan is: check and repair the electric heater;

[0235] When the fault warning result is that the cold oil injector is not put into operation, the generated fault diagnosis plan is: put into operation the cold oil cooler;

[0236] When the fault warning result is that the lubricating oil pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement or pipeline dredging;

[0237] When the fault warning result is that the quality of the lubricating oil deteriorates, the generated fault diagnosis plan is: lubricating oil quality testing, and filtering or changing the lubricating oil;

[0238] When the fault warning result is that the lubricating oil pump fails, the generated fault diagnosis plan is: the working current of the lubricating oil pump is too low, and repair the lubricating oil pump;

[0239] When the fault warning result is that the flow rate of the lubricating oil is too low, the generated fault diagnosis plan is: leakage of the hydraulic oil or lubricating oil system pipeline or valve, and ultrasonic flow measurement or pipeline dredging or leakage plugging;

[0240] When the fault warning result is that the temperature control door of the lubricating oil station fails, the generated fault diagnosis plan is: the temperature control door of the lubricating oil station fails, and check or repair the temperature control door;

[0241] When the fault result is abnormal closed cooling water supply or cold oil pump failure, the generated fault diagnosis plan is: the working current of the cold oil pump is too low, and repair the cold oil pump;

[0242] When the fault result is that the closed cooling water pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement, and stop the machine to dredge the pipeline;

[0243] When the fault result is that the bearing bush is out of shape or burned out, the generated fault diagnosis plan is: stop the machine or turn over the bearing bush;

[0244] When the fault result is uneven wear or corrosion of the impeller or blade, the generated fault diagnosis plan is: repair the impeller and blade, and conduct an on-site dynamic balance test;

[0245] When the fault result is uneven ash accumulation on the blade, the generated fault diagnosis plan is: clean the blade, and conduct an on-site dynamic balance test;

[0246] When the failure result is uneven ash accumulation in the cavity due to blade wear-through, the generated fault diagnosis plan is: clean the ash accumulation in the cavity and repair it, and conduct an on-site dynamic balance test;

[0247] When the failure result is shaft bending due to local high temperature of the main shaft, the generated fault diagnosis plan is: straighten the shaft and repair it, and conduct an on-site dynamic balance test;

[0248] When the failure result is impeller cracking, the generated fault diagnosis plan is: repair the impeller and conduct an on-site dynamic balance test;

[0249] When the failure result is the loosening and falling off of the balance weight, the generated fault diagnosis plan is: check and repair it, and conduct an on-site dynamic balance test;

[0250] When the failure result is poor grouting of the bearing seat foundation, the generated fault diagnosis plan is: re-grout and conduct an on-site dynamic balance test;

[0251] When the failure result is loose anchor bolts, the generated fault diagnosis plan is: tighten the anchor bolts and conduct an on-site dynamic balance test;

[0252] When the failure result is loose gasket, the generated fault diagnosis plan is: adjust the gasket and conduct an on-site dynamic balance test;

[0253] When the failure result is loose connection of the machine base, the generated fault diagnosis plan is: adjust the connection stiffness and conduct an on-site dynamic balance test;

[0254] When the failure result is low stiffness of the bearing seat, the generated fault diagnosis plan is: conduct an on-site dynamic balance test;

[0255] When the failure results are excessive coupling opening, excessive coupling concentricity, and the coupling alignment not considering operation, the generated fault diagnosis plan is: adjust the coupling and conduct an on-site dynamic balance test;

[0256] When the failure results are rubbing between the collector outlet and the impeller inlet, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: adjust the clearance and the axis center, and conduct an on-site dynamic balance test;

[0257] When the failure result is rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: strengthen the stiffness and conduct an on-site dynamic balance test;

[0258] When the failure result is poor machining of the journal or shaft shoulder platform, the generated fault diagnosis plan is: repair by the manufacturer;

[0259] When the failure result is journal bending, the generated fault diagnosis plan is: repair the journal;

[0260] When the fault result is that the bearing is installed obliquely, the generated fault diagnosis plan is: adjust the bearing;

[0261] When the fault result is that the inner ring of the bearing does not coincide with the axis line after assembly, the generated fault diagnosis plan is: replace the bearing;

[0262] When the fault result is that the fixing nut of the rolling bearing is loose, the generated fault diagnosis plan is: repair the bearing;

[0263] When the fault result is that the balls or rollers are worn, the generated fault diagnosis plan is: replace the bearing;

[0264] When the fault result is an air preheater fault, the generated fault diagnosis plan is: repair the air preheater, conduct flue gas analysis and ash analysis;

[0265] When the fault result is an air flow system fault, the generated fault diagnosis plan is: check whether the dampers are uniform, adjust the air pressure, adjust the load, modify the air duct or add a sound insulation cover or shock absorber;

[0266] When the fault result is that the accessories are loose, the generated fault diagnosis plan is: tighten the loose parts.

[0267] As an alternative implementation manner of the embodiment of the present invention, the dynamic unbalance is judged in the following manner: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is stable, and the phase change within the preset time < the second preset value;

[0268] The vibration caused by insufficient stiffness of the bearing seat foundation is judged in the following manner: through displacement spectrum analysis: the amplitude of the fundamental frequency / the amplitude of the second harmonic frequency >= the first preset value, and it is unstable, the amplitude change of the fundamental frequency within the preset time > the third preset value, and the phase change < the second preset value;

[0269] The vibration caused by the abnormality of the coupling is judged in the following manner: through displacement spectrum analysis: the amplitude of the second harmonic frequency / the amplitude of the fundamental frequency >= the preset range, and it is stable, and the phase change of the fundamental frequency within the preset time < the second preset value;

[0270] The vibration caused by the dynamic and static friction is judged in the following manner: the vibration displacement amplitude of the fundamental frequency is unstable and the amplitude change within the preset time > the fourth preset value, and the phase change of the fundamental frequency within the preset time < the second preset value;

[0271] The rotating stall and surge are judged in the following manner: through displacement spectrum analysis: having the characteristics of mainly fundamental frequency + low-frequency beat vibration.

[0272] It can be seen that through the induced draft fan health monitoring, fault warning and fault diagnosis device provided by the embodiments of the present invention, data monitoring can be carried out, the fault type can be determined according to the alarm type, and then fault warning and fault diagnosis can be carried out, which can improve the accuracy of early fault warning and assessment.

[0273] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A method for health monitoring, fault warning and fault diagnosis of an induced draft fan, characterized in that Including: Determine the fault type according to the alarm type; wherein, the alarm type includes: abnormal oil temperature alarm in the lubricating oil tank, low oil level alarm in the lubricating oil tank, low lubricating oil pressure alarm, high bearing temperature alarm, large vibration alarm of the induced draft fan bearing, and large noise and large vibration alarm of the casing; the fault type includes: lubricating oil system fault, cooling water system fault, bearing lubrication fault, dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, rotating stall and surge, and mechanical system fault; Conduct fault early warning according to the determined fault type; Generate a fault diagnosis plan according to the result of the fault early warning.

2. The method according to claim 1, wherein The determining the fault type according to the alarm type includes: Determine that the fault type is a lubricating oil system fault according to the abnormal oil temperature alarm in the lubricating oil tank, the low oil level alarm in the lubricating oil tank, the low lubricating oil pressure alarm, and / or the high bearing temperature alarm; Determine that the fault type is a cooling water system fault according to the abnormal oil temperature alarm in the lubricating oil tank and / or the high bearing temperature alarm; Determine that the fault type is a bearing lubrication fault according to the high bearing temperature alarm; Determine that the fault type is dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, and / or rotating stall and surge according to the large vibration alarm of the induced draft fan bearing; Determine that the fault type is a mechanical system fault and an air flow system fault according to the large noise and large vibration alarm of the casing.

3. The method according to claim 2, wherein The conducting fault early warning according to the determined fault type includes: The conducting fault early warning according to the lubricating oil system fault includes: abnormal operation of the electric heater, cold injector not put into use, lubricating oil pipeline blocked or flow rate too low, deterioration of lubricating oil quality, lubricating oil pump fault, low lubricating oil flow rate, lubricating oil quality testing, and malfunction of the temperature control valve of the lubricating oil station; The conducting fault early warning according to the cooling water system fault includes: abnormal closed cooling water supply or cold oil pump fault and blocked or low flow rate of the closed cooling water pipeline; The conducting fault early warning according to the bearing lubrication fault includes: the bearing bush coming off or burning out; The conducting fault early warning according to the dynamic unbalance includes: uneven wear or corrosion of the impeller or blade, uneven ash accumulation on the blade, uneven ash accumulation in the cavity caused by the blade being worn through, local high temperature of the main shaft causing the shaft to bend, impeller cracking, and loosening and falling off of the balance weight; The conducting fault early warning according to the vibration caused by insufficient stiffness of the bearing seat foundation includes: poor grouting of the bearing seat foundation, loosening of the anchor bolts, loosening of the gasket, loose connection of the machine base, and low stiffness of the bearing seat; The conducting fault early warning according to the vibration caused by abnormal coupling includes: excessive opening of the coupling, excessive concentricity of the coupling, and failure to consider operation during coupling alignment; The conducting fault early warning according to the vibration caused by dynamic and static friction includes: rubbing between the outlet of the collector and the inlet of the impeller, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing caused by reduced stiffness of the body or pedestal; Fault warning based on abnormalities caused by rolling bearings includes: poor machining of journal or shaft shoulder, bent journal, inclined bearing installation, non - coincidence of the inner ring of the bearing with the axis line after assembly, loose fixing nut of the rolling bearing, and worn balls or rollers; Fault warning based on the intermittent vibration caused by the corrosion of the air pre - heater includes: air pre - heater failure; Fault warning based on rotating stall and surging includes: airflow system failure; Fault warning based on mechanical system failure includes: loose appendages.

4. The method according to claim 3, wherein The generation of a fault diagnosis plan according to the fault warning result includes: When the fault warning result is that the electric heater operates abnormally, the generated fault diagnosis plan is: check and repair the electric heater; When the fault warning result is that the cold oil cooler is not put into operation, the generated fault diagnosis plan is: put the cold oil cooler into operation; When the fault warning result is that the lubricating oil pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement or pipeline dredging; When the fault warning result is that the quality of the lubricating oil deteriorates, the generated fault diagnosis plan is: lubricating oil quality testing, and filtering or changing the oil; When the fault warning result is that the lubricating oil pump fails, the generated fault diagnosis plan is: the working current of the lubricating oil pump is too low, and repair the lubricating oil pump; When the fault warning result is that the lubricating oil flow rate is too low, the generated fault diagnosis plan is: leakage of hydraulic oil or lubricating oil system pipelines or valves, and ultrasonic flow measurement or pipeline dredging or leakage plugging; When the fault warning result is that the temperature control door of the lubricating oil station fails, the generated fault diagnosis plan is: the temperature control door of the lubricating oil station fails, and check or repair the temperature control door; When the fault result is abnormal closed - cooling water supply or cold oil pump failure, the generated fault diagnosis plan is: the working current of the cold oil pump is too low, and repair the cold oil pump; When the fault result is that the closed - cooling water pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement, and stop the machine to dredge the pipeline; When the fault result is that the bearing bush is out of shape or burned, the generated fault diagnosis plan is: stop the machine or turn over the bearing bush; When the fault result is uneven wear or corrosion of the impeller or blade, the generated fault diagnosis plan is: repair the impeller and blade, and conduct an on - site dynamic balance test; When the fault result is uneven ash accumulation on the blade, the generated fault diagnosis plan is: clean the blade, and conduct an on - site dynamic balance test; When the fault result is that the blade is worn through, resulting in uneven ash accumulation in the cavity, the generated fault diagnosis plan is: clean and repair the cavity ash accumulation, and conduct an on - site dynamic balance test; When the fault result is that the main shaft is locally overheated, causing the shaft to bend, the generated fault diagnosis plan is: straighten the shaft and repair it, and conduct an on - site dynamic balance test; When the fault result is that the impeller cracks, the generated fault diagnosis plan is: repair the impeller, and conduct an on - site dynamic balance test; When the fault result is that the balance weight is loose and falls off, the generated fault diagnosis plan is: check and repair it, and conduct an on - site dynamic balance test; When the fault result is poor grouting of the bearing seat foundation, the generated fault diagnosis plan is: re - grout, and conduct an on - site dynamic balance test; When the fault result is that the anchor bolts are loose, the generated fault diagnosis plan is: tighten the anchor bolts, and conduct an on - site dynamic balance test; When the failure result is that the gasket is loose, the generated fault diagnosis plan is: adjust the gasket and conduct an on-site dynamic balance test; When the failure result is that the machine base connection is not firm, the generated fault diagnosis plan is: adjust the connection stiffness and conduct an on-site dynamic balance test; When the failure result is that the bearing housing stiffness is low, the generated fault diagnosis plan is: conduct an on-site dynamic balance test; When the failure results are that the coupling opening exceeds the standard, the coupling concentricity exceeds the standard, and the coupling alignment does not consider operation, the generated fault diagnosis plan is: adjust the coupling and conduct an on-site dynamic balance test; When the failure results are that there is rubbing between the collector outlet and the impeller inlet, between the impeller and the casing, between the main shaft and the seal, and rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: adjust the clearance and the axis center and conduct an on-site dynamic balance test; When the failure result is rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: strengthen the stiffness and conduct an on-site dynamic balance test; When the failure result is that the journal or shaft shoulder platform is poorly machined, the generated fault diagnosis plan is: repair by the manufacturer; When the failure result is that the journal is bent, the generated fault diagnosis plan is: repair the journal; When the failure result is that the bearing is installed obliquely, the generated fault diagnosis plan is: adjust the bearing; When the failure result is that the inner ring of the bearing does not coincide with the axis line after assembly, the generated fault diagnosis plan is: replace the bearing; When the failure result is that the fixing nut of the rolling bearing is loose, the generated fault diagnosis plan is: repair the bearing; When the failure result is that the balls or rollers are worn, the generated fault diagnosis plan is: replace the bearing; When the failure result is an air preheater failure, the generated fault diagnosis plan is: repair the air preheater, conduct flue gas analysis and ash analysis; When the failure result is an air flow system failure, the generated fault diagnosis plan is: check whether the dampers are uniform, adjust the air pressure, adjust the load, modify the air duct or add a sound insulation cover or shock absorber; When the failure result is that the accessories are loose, the generated fault diagnosis plan is: tighten the loose parts.

5. According to the method described in claim 4, wherein, The dynamic unbalance is judged in the following way: through displacement spectrum analysis: the amplitude of the 1x frequency / the amplitude of the 2x frequency >= the first preset value and is stable, and the phase change within the preset time < the second preset value; The vibration caused by insufficient stiffness of the bearing housing foundation is judged in the following way: through displacement spectrum analysis: the amplitude of the 1x frequency / the amplitude of the 2x frequency >= the first preset value and is unstable, the amplitude change of the 1x frequency within the preset time > the third preset value, and the phase change < the second preset value; The vibration caused by abnormal coupling is judged in the following way: through displacement spectrum analysis: the amplitude of the 2x frequency / the amplitude of the 1x frequency >= the preset range and is stable, and the phase change of the 1x frequency within the preset time < the second preset value; The vibration caused by dynamic and static friction is judged in the following way: the vibration displacement amplitude of the 1x frequency is unstable and the amplitude change within the preset time > the fourth preset value, and the phase change of the 1x frequency within the preset time < the second preset value; The rotating stall and surge are judged in the following way: through displacement spectrum analysis: having the characteristics of mainly 1x frequency + low-frequency beat vibration.

6. A device for the health monitoring, fault warning and fault diagnosis of an induced draft fan, characterized in that, Including: A determination module, configured to determine a fault type according to an alarm type; wherein, the alarm type includes: abnormal oil temperature alarm in the lubricating oil tank, low oil level alarm in the lubricating oil tank, low lubricating oil pressure alarm, high bearing temperature alarm, large vibration alarm of the induced draft fan bearing, and large noise and large vibration alarm of the casing; the fault type includes: lubricating oil system fault, cooling water system fault, bearing lubrication fault, dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, rotating stall and surge, and mechanical system fault; A warning module, configured to perform fault warning according to the determined fault type; A generation module, configured to generate a fault diagnosis plan according to the fault warning result.

7. The device according to claim 6, characterized in that, The determination module determines the fault type according to the alarm type in the following manner: Determine that the fault type is a lubricating oil system fault according to the abnormal oil temperature alarm in the lubricating oil tank, the low oil level alarm in the lubricating oil tank, the low lubricating oil pressure alarm, and / or the high bearing temperature alarm; Determine that the fault type is a cooling water system fault according to the abnormal oil temperature alarm in the lubricating oil tank and / or the high bearing temperature alarm; Determine that the fault type is a bearing lubrication fault according to the high bearing temperature alarm; Determine that the fault type is dynamic unbalance, vibration caused by insufficient stiffness of the bearing seat foundation, vibration caused by abnormal coupling, vibration caused by dynamic and static friction, abnormality caused by rolling bearings, intermittent vibration caused by corrosion of the air preheater, and / or rotating stall and surge according to the large vibration alarm of the induced draft fan bearing; Determine that the fault type is a mechanical system fault and an air flow system fault according to the large noise and large vibration alarm of the casing.

8. The device according to claim 7, characterized in that, The warning module performs fault warning according to the determined fault type in the following manner: Performing fault warning according to the lubricating oil system fault includes: abnormal operation of the electric heater, cold injector not put into use, lubricating oil pipeline blockage or low flow rate, deterioration of lubricating oil quality, lubricating oil pump failure, low lubricating oil flow rate, lubricating oil quality testing, and malfunction of the temperature control valve of the lubricating oil station; Performing fault warning according to the cooling water system fault includes: abnormal closed cooling water supply or cold oil pump failure and blockage or low flow rate of the closed cooling water pipeline; Performing fault warning according to the bearing lubrication fault includes: the bearing bush coming off or burning out; Performing fault warning according to dynamic unbalance includes: uneven wear or corrosion of the impeller or blade, uneven ash accumulation on the blade, uneven ash accumulation in the cavity caused by the blade being worn through, local high temperature of the main shaft causing the shaft to bend, impeller cracking, and loosening and falling off of the balance weight; Performing fault warning according to the vibration caused by insufficient stiffness of the bearing seat foundation includes: poor grouting of the bearing seat foundation, loosening of the anchor bolts, loosening of the gasket, loose connection of the machine base, and low stiffness of the bearing seat; Performing fault warning according to the vibration caused by abnormal coupling includes: excessive opening of the coupling, excessive concentricity of the coupling, and failure to consider operation during coupling alignment; Performing fault warning according to the vibration caused by dynamic and static friction includes: rubbing between the outlet of the collector and the inlet of the impeller, rubbing between the impeller and the casing, rubbing between the main shaft and the seal, and rubbing caused by reduced stiffness of the main body or the base; Fault warning based on abnormalities caused by rolling bearings includes: poor machining of journal or shaft shoulder, bent journal, inclined bearing installation, non - coincidence of the inner ring of the bearing with the axis line after assembly, loose fixing nut of the rolling bearing, and wear of balls or rollers; Fault warning based on the intermittent vibration caused by the corrosion of the air pre - heater includes: air pre - heater failure; Fault warning based on rotating stall and surging includes: air flow system failure; Fault warning based on mechanical system failure includes: loosening of appendages.

9. The device according to claim 8, wherein The generation module generates a fault diagnosis plan according to the fault warning result in the following way: When the fault warning result is that the electric heater works abnormally, the generated fault diagnosis plan is: check and repair the electric heater; When the fault warning result is that the cold oil cooler is not put into operation, the generated fault diagnosis plan is: put into operation the cold oil cooler; When the fault warning result is that the lubricating oil pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement or pipeline dredging; When the fault warning result is that the quality of the lubricating oil deteriorates, the generated fault diagnosis plan is: lubricating oil quality test, and filter or change the oil; When the fault warning result is that the lubricating oil pump fails, the generated fault diagnosis plan is: the working current of the lubricating oil pump is too low, and repair the lubricating oil pump; When the fault warning result is that the lubricating oil flow rate is too low, the generated fault diagnosis plan is: leakage of hydraulic oil or lubricating oil system pipeline or valve, and ultrasonic flow measurement or pipeline dredging or leakage plugging; When the fault warning result is that the temperature control door of the lubricating oil station fails, the generated fault diagnosis plan is: the temperature control door of the lubricating oil station fails, and check or repair the temperature control door; When the fault result is abnormal closed - cooling water supply or cold oil pump failure, the generated fault diagnosis plan is: the working current of the cold oil pump is too low, and repair the cold oil pump; When the fault result is that the closed - cooling water pipeline is blocked or the flow rate is too low, the generated fault diagnosis plan is: ultrasonic flow measurement, and stop the machine to dredge the pipeline; When the fault result is that the bearing bush is out of shape or burned, the generated fault diagnosis plan is: stop the machine or turn over the bearing bush; When the fault result is uneven wear or corrosion of the impeller or blade, the generated fault diagnosis plan is: repair the impeller and blade, and conduct an on - site dynamic balance test; When the fault result is uneven ash accumulation on the blade, the generated fault diagnosis plan is: clean the blade, and conduct an on - site dynamic balance test; When the fault result is that the blade is worn through and causes uneven ash accumulation in the cavity, the generated fault diagnosis plan is: clean and repair the ash accumulation in the cavity, and conduct an on - site dynamic balance test; When the fault result is that the main shaft is locally overheated and causes the shaft to bend, the generated fault diagnosis plan is: straighten the shaft and repair it, and conduct an on - site dynamic balance test; When the fault result is that the impeller cracks, the generated fault diagnosis plan is: repair the impeller, and conduct an on - site dynamic balance test; When the fault result is that the balance weight is loose and falls off, the generated fault diagnosis plan is: check and repair, and conduct an on - site dynamic balance test; When the fault result is poor grouting of the bearing seat foundation, the generated fault diagnosis plan is: re - grout, and conduct an on - site dynamic balance test; When the fault result is that the anchor bolts are loose, the generated fault diagnosis plan is: tighten the anchor bolts, and conduct an on - site dynamic balance test; When the failure result is that the gasket is loose, the generated fault diagnosis plan is: adjust the gasket and conduct on-site dynamic balancing tests; When the failure result is that the machine base connection is not firm, the generated fault diagnosis plan is: adjust the connection stiffness and conduct on-site dynamic balancing tests; When the failure result is that the bearing housing stiffness is low, the generated fault diagnosis plan is: conduct on-site dynamic balancing tests; When the failure results are that the coupling opening exceeds the standard, the coupling concentricity exceeds the standard, and the coupling alignment does not consider operation, the generated fault diagnosis plan is: adjust the coupling and conduct on-site dynamic balancing tests; When the failure results are that there is rubbing between the collector outlet and the impeller inlet, between the impeller and the casing, between the main shaft and the seal, and rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: adjust the clearance and the axis center and conduct on-site dynamic balancing tests; When the failure result is rubbing due to reduced stiffness of the body or base, the generated fault diagnosis plan is: strengthen the stiffness and conduct on-site dynamic balancing tests; When the failure result is that the journal or shaft shoulder platform is poorly machined, the generated fault diagnosis plan is: repair by the manufacturer; When the failure result is that the journal is bent, the generated fault diagnosis plan is: repair the journal; When the failure result is that the bearing is installed obliquely, the generated fault diagnosis plan is: adjust the bearing; When the failure result is that the inner ring of the bearing does not coincide with the axis line after assembly, the generated fault diagnosis plan is: replace the bearing; When the failure result is that the fixing nut of the rolling bearing is loose, the generated fault diagnosis plan is: repair the bearing; When the failure result is that the balls or rollers are worn, the generated fault diagnosis plan is: replace the bearing; When the failure result is an air preheater failure, the generated fault diagnosis plan is: repair the air preheater, conduct flue gas analysis and ash analysis; When the failure result is an air flow system failure, the generated fault diagnosis plan is: check whether the dampers are uniform, adjust the air pressure, adjust the load, modify the air duct or add a sound insulation cover or shock absorber; When the failure result is that the accessories are loose, the generated fault diagnosis plan is: tighten the loose parts.

10. The device according to claim 9, characterized in that, The dynamic unbalance is judged by the following method: through displacement spectrum analysis: the amplitude of the 1x frequency / the amplitude of the 2x frequency >= the first preset value, and it is stable, and the phase change within the preset time < the second preset value; The vibration caused by insufficient stiffness of the bearing housing foundation is judged by the following method: through displacement spectrum analysis: the amplitude of the 1x frequency / the amplitude of the 2x frequency >= the first preset value, and it is unstable, the amplitude change of the 1x frequency within the preset time > the third preset value, and the phase change < the second preset value; The vibration caused by abnormal coupling is judged by the following method: through displacement spectrum analysis: the amplitude of the 2x frequency / the amplitude of the 1x frequency >= the preset range, and it is stable, and the phase change of the 1x frequency within the preset time < the second preset value; The vibration caused by dynamic and static friction is judged by the following method: the vibration displacement amplitude of the 1x frequency is unstable and the amplitude change within the preset time > the fourth preset value, and the phase change of the 1x frequency within the preset time < the second preset value; The rotating stall and surge are judged by the following method: through displacement spectrum analysis: having the characteristics of mainly 1x frequency + low-frequency beating vibration.

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