CN102644912B - Online monitoring and controlling device and method for safety risk of heat exchange tube of power station boiler - Google Patents

Online monitoring and controlling device and method for safety risk of heat exchange tube of power station boiler Download PDF

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Publication number
CN102644912B
CN102644912B CN201110413840.7A CN201110413840A CN102644912B CN 102644912 B CN102644912 B CN 102644912B CN 201110413840 A CN201110413840 A CN 201110413840A CN 102644912 B CN102644912 B CN 102644912B
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station boiler
exchange tube
heat
risk
boiler
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CN102644912A (en
Inventor
史进渊
杨宇
沈海鸥
施峻
邓志成
汪勇
张峰
王�华
史啸曦
朱惠英
曹忠伟
徐俊强
张琳
李汪繁
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ELECTRIC EQUIPMENT ENGINEERING Co Ltd OF SHANGHAI POWER EQUIPMENT RESEARCH INSTITUTE
Power Equipment Engineering Co Ltdof Shanghai Power Equipment Research Institute
Shanghai Power Equipment Research Institute Co Ltd
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ELECTRIC EQUIPMENT ENGINEERING Co Ltd OF SHANGHAI POWER EQUIPMENT RESEARCH INSTITUTE
Power Equipment Engineering Co Ltdof Shanghai Power Equipment Research Institute
Shanghai Power Equipment Research Institute Co Ltd
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Abstract

The invention provides an online monitoring and controlling device and method for a safety risk of a heat exchange tube of a power station boiler. The online monitoring and controlling device for the safety risk of the heat exchange tube of the power station boiler is characterized by comprising a boiler furnace pressure sensor, a steam bag water level measuring device, a turbine regulating stage post-steam pressure sensor, a draught fan ampere meter, a smoke humidity sensor, a power station boiler thermal process protection system interface, a compute server, a webpage server and a user-side browser, wherein the boiler furnace pressure sensor, the steam bag water level measuring device, the turbine regulating stage post-steam pressure sensor, the draught fan ampere meter and the smoke humidity sensor are respectively connected with the computer sensor through the power station boiler thermal process protection system interface; the computer server is connected with the webpage server; and the webpage server is connected with the user-side browser. According to the online monitoring and controlling device for the safety risk of the heat exchange tube of the power station boiler, the online computation and control for the safety risk of the heat exchange tube of the power station boiler is realized.

Description

Station boiler heat-exchange tube security risk in-service monitoring and control device and method
Technical field
The present invention relates to station boiler heat-exchange tube security risk in-service monitoring and control device and method, belong to Utility Boiler Technology field.
Background technology
The heat-exchange tube of station boiler comprises economizer, water-cooling wall, superheater and reheater.The effect of economizer is to utilize the heat of boiler tail low-temperature flue gas to carry out heating boiler feedwater, reduces exhaust gas temperature, improves boiler efficiency, saves Fuel Consumption.The effect of water-cooling wall is absorb the heat of furnace flame and flue gas and pass to the water in water-cooling wall pipe, makes it be evaporated to saturated vapor.The effect of superheater is that saturated vapor is heated into the superheated steam with uniform temperature, to improve the thermal efficiency of fired power generating unit.The effect of reheater is that steam turbine high-pressure cylinder steam discharge is heated to and is equated with superheated steam or close reheat temperature, and then delivers to expansion acting in Steam Turbine Through IP Admission and low pressure (LP) cylinder, further improves the thermal efficiency of fired power generating unit.Station boiler heat-exchange tube generation pipe explosion accident, consequence is serious.The security risk of station boiler heat-exchange tube is relevant with heat-exchange tube pipe explosion accident consequence with heat-exchange tube generation pipe explosion accident possibility; Station boiler heat-exchange tube generation pipe explosion accident possibility is relevant with Accident Characteristic signal with accident probability, and the damage sequence of station boiler heat-exchange tube is relevant with repair time length.Existing station boiler protection system in heat power engineering, has the online defencive function such as motor current of furnace pressure, steam water-level, air-introduced machine, the in-service monitoring that also there is no a station boiler heat-exchange tube security risk with control function.
Summary of the invention
The object of this invention is to provide station boiler heat-exchange tube security risk in-service monitoring and control device and method, realize in-service monitoring and the control of station boiler heat-exchange tube security risk.
In order to realize above object, the invention provides a kind of in-service monitoring and control device of station boiler heat-exchange tube security risk, it is characterized in that, comprise boiler furnace pressure sensor, Level Measuring Equipment in Steam Drum, steam pressure sensor after Control Stage of Steam Turbine, air-introduced machine ammeter, smoke moisture sensor, station boiler protection system in heat power engineering interface, calculation server, web page server and user side browser, boiler furnace pressure sensor is located at horizontal flue upper wall surface and the lower wall surface of inverted U boiler, Level Measuring Equipment in Steam Drum is located on drum, after Control Stage of Steam Turbine, steam pressure sensor is located on steam turbine high-pressure cylinder, air-introduced machine ammeter is located on the motor of air-introduced machine, smoke moisture sensor is located on the surrounding furnace wall inwall of boiler back end ductwork, boiler furnace pressure sensor, Level Measuring Equipment in Steam Drum, steam pressure sensor after Control Stage of Steam Turbine, air-introduced machine ammeter, smoke moisture sensor all connects calculation server by station boiler protection system in heat power engineering interface, and calculation server connects web page server, and web page server connects user side browser.
The present invention also provides a kind of security risk in-service monitoring and control method of station boiler heat-exchange tube, it is characterized in that, use said apparatus, adopt the software for calculation of C language compilation station boiler heat-exchange tube security risk, operate on calculation server, be applied to station boiler heat-exchange tube security risk in-service monitoring and control, concrete steps are:
The first step: the accident probability F that calculates station boiler heat-exchange tube generation booster pi: use computer software, at the probability F of line computation station boiler i kind heat-exchange tube generation pipe explosion accident pi
In formula, n ifor the number of times of each i kind heat-exchange tube generation pipe explosion accident of this TV station station boiler, n 0ifor the historical data statistical value of the total degree of the corresponding i kind of existing same model station boiler heat-exchange tube generation pipe explosion accident in software data file, t ifor this TV station station boiler is from putting into operation to current calendar hourage, t 0istatistical value for the historical data of total calendar hourage of existing same model station boiler use in software data file;
Second step: in-service monitoring Pressure Signals in Furnace of Utility Boiler Using: adopt boiler furnace pressure sensor, in-service monitoring furnace of power-plant boilers pressure, according to the size of furnace pressure supervision value, the 1st FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 1be illustrated in table 1;
Table 1:
The 3rd step: in-service monitoring Water Level in Power Plant Boiler Drums signal: adopt Level Measuring Equipment in Steam Drum, the steam water-level of in-service monitoring dum boiler, according to the size of Water Level in Power Plant Boiler Drums supervision value, the 2nd FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 2be illustrated in table 2;
Table 2:
The 4th step: in-service monitoring station boiler main steam flow signal: steam pressure sensor after employing Control Stage of Steam Turbine, steam pressure after in-service monitoring power station steam turbine governing stage, the relation being directly proportional to steam pressure after governing stage according to main steam flow, at line computation main steam flow, and according to main steam flow under identical unit load, increase the size of significantly supervision value, the 3rd FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 3be illustrated in table 3;
Table 3:
The 5th step: the current signal of in-service monitoring air-introduced machine motor: adopt air-introduced machine ammeter, the motor current of in-service monitoring station boiler air-introduced machine, according to the size of the supervision value of the motor current of station boiler air-introduced machine, the 4th FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 4be illustrated in table 4;
Table 4:
The 6th step: in-service monitoring flue gas in power station boiler moisture signal: adopt smoke moisture sensor, in-service monitoring flue gas in power station boiler humidity, according to flue gas in power station boiler humidity, increase the size of the supervision value of percentage, the 5th FACTOR P of definition heat-exchange tube accident possibility occurrence 5be illustrated in table 5;
Table 5:
The 7th step: the mean time to overhaul MTTR that calculates heat-exchange tube i: use existing historical data in computer software, at the mean time to overhaul MTTR of line computation station boiler i kind heat-exchange tube generation pipe explosion accident i
In formula, τ 0itotal unplanned idle time of the station boiler causing for the corresponding i kind of the existing same model station boiler of software data file heat-exchange tube generation pipe explosion accident;
The 8th step: the dynamic security risk ranking that calculates station boiler heat-exchange tube is counted RPN i: use software for calculation, calculate the dynamic security risk ranking of station boiler i kind heat-exchange tube generation pipe explosion accident and count RPN i
RPN i=F Pi×P 1×P 2×P 3×P 4×P 5×MTTR i
The 9th step: evaluation station boiler heat-exchange tube security risk grade: according to the RPN of station boiler heat-exchange tube dynamic security risk ranking number isize, is divided into 5 grades the security risk of station boiler heat-exchange tube, represents table 6;
Table 6:
The tenth step: the maximum dynamic security risk ranking of determining station boiler heat-exchange tube is counted RPN max: adopt following formula, the maximum dynamic security risk ranking in the dynamic security risk ranking number of calculating station boiler heat-exchange tube is counted RPN max
RPN max=max{RPN i}
The 11 step: the risk control measure of taking station boiler heat-exchange tube: count RPN according to the maximum dynamic security risk ranking of station boiler heat-exchange tube maxcalculated value, take following risk control measure countermeasure:
(1) if RPN max<72, there is Pyatyi risk, slight risk, acceptable risk, maintenance interval and the maintenance content arrangement C level maintenance (plan light maintenance) of pressing the overhaul of the equipments guide rule > > of < < electricity power enterprise (DL/T838) regulation check comprehensively;
(2) if 72≤RPN max<168, has level Four risk, ordinary risk, and acceptable risk arranges, in C level maintenance (plan light maintenance), to check within this month comprehensively;
(3) if 168≤RPN max<336, has tertiary risk, important risk, and unacceptable risk arranges ad hoc inspection and repair within this week, checks comprehensively;
(4) if 336≤RPN max<720, has secondary risk, serious risk, and unacceptable risk arranged ad hoc inspection and repair in three days, checked comprehensively;
(5) if RPN max>=720, there is prime risk, material risk, unacceptable risk, blowing out immediately arranges ad hoc inspection and repair, checks comprehensively.
Advantage of the present invention is in-service monitoring and the control device that has provided station boiler heat-exchange tube security risk, has realized the online calculation and control of station boiler heat-exchange tube security risk.If when station boiler heat-exchange tube dynamic security risk ranking number increases, overhaul to make the security risk of station boiler heat-exchange tube in slave mode by rational arrangement ad hoc inspection and repair or C level.
Accompanying drawing explanation
Fig. 1 is the block diagram of station boiler heat-exchange tube security risk in-service monitoring of the present invention and control device;
Fig. 2 is the flow chart of station boiler heat-exchange tube security risk in-service monitoring of the present invention and control method;
Fig. 3 is the computer software block diagram that calculation server of the present invention adopts;
Fig. 4 is the schematic diagram of station boiler heat-exchange tube security risk sequence number result of calculation.
The specific embodiment
Below in conjunction with embodiment, illustrate the present invention.
Embodiment
As shown in Figure 1, block diagram for station boiler heat-exchange tube security risk in-service monitoring of the present invention and control device, station boiler heat-exchange tube security risk in-service monitoring of the present invention and control device are by boiler furnace pressure sensor 1, Level Measuring Equipment in Steam Drum 2, steam pressure sensor 3 after Control Stage of Steam Turbine, air-introduced machine ammeter 4, smoke moisture sensor 5, station boiler protection system in heat power engineering interface, calculation server, web page server and user side browser form, horizontal flue upper wall surface and lower wall surface at inverted U boiler are installed respectively 3 boiler furnace pressure sensors 1, Level Measuring Equipment in Steam Drum 2(is installed on drum and comprises that 1 overlaps water-level gauge on the spot, 3 cover differential pressure water level measuring devices and 3 cover electric pole type level measurement devices), steam pressure sensor 3 after steam turbine high-pressure cylinder is installed 2 Control Stage of Steam Turbine, 2 air-introduced machine ammeters 4 are installed on the motor of two air-introduced machines, surrounding furnace wall inwall at boiler back end ductwork is installed 4 smoke moisture sensors 5, boiler furnace pressure sensor 1, Level Measuring Equipment in Steam Drum 2, steam pressure sensor 3 after Control Stage of Steam Turbine, air-introduced machine ammeter 4, smoke moisture sensor 5 is all connected calculation server with station boiler protection system in heat power engineering interface, calculation server connects web page server, web page server connects user side browser.
As shown in Figure 2, the flow chart of station boiler heat-exchange tube security risk in-service monitoring of the present invention and control method, as shown in Figure 3, the computer software block diagram that calculation server of the present invention adopts, this software is arranged on the calculation server of station boiler heat-exchange tube security risk sequence number, be applied to station boiler heat-exchange tube security risk in line computation and control.
For the subcritical 300MW controlled circulation of certain model boiler, the alarming value of furnace pressure is 0.996kPa, steam water-level alarming value is-178mm, with the lower main steam flow of load, increasing significantly alarming value is 2%, the alarming value of the motor current of air-introduced machine is 126 amperes, and the alarming value of the increase percentage of smoke moisture is 20%.This 300MW station boiler heat-exchange tube adopts the computer software shown in device, the flow chart shown in Fig. 2 and the Fig. 3 shown in Fig. 1, and Fig. 4 is the schematic diagram of this 300MW station boiler heat-exchange tube security risk result of calculation at a time.The supervision of the heat-exchange tube of this 300MW station boiler security risk is at a time as follows with control result:
The first step: the accident probability F of station boiler heat-exchange tube generation booster pionline result of calculation list in table 7;
Table 7:
Heat-exchange tube title Pipe explosion accident probability F Pi
Economizer 2.901777×10 -1
Water-cooling wall 6.897997×10 -1
Superheater 6.315633×10 -1
Reheater 3.283326×10 -1
Second step and the 3rd step: use computer software, the FACTOR P that is worth going out by 300MW furnace of power-plant boilers pressure in-service monitoring 1the FACTOR P that is worth going out with Monitoring Drum Water Level 2calculated value list in table 8;
Table 8:
Heat-exchange tube title P 1 P 2
Economizer 1 1
Water-cooling wall 2 1
Superheater 2 1
Reheater 2 1
The 4th step, the 5th step and the 6th step: the FACTOR P that is worth going out by 300MW station boiler main steam flow in-service monitoring 3, air-introduced machine the motor current in-service monitoring FACTOR P that is worth going out 4the FACTOR P that is worth going out with flue-gas temperature in-service monitoring 5calculated value list in table 9;
Table 9:
Heat-exchange tube title P 3 P 4 P 5
Economizer 1 2 1
Water-cooling wall 2 1 1
Superheater 2 2 1
Reheater 2 1 1
The 7th step: the mean time to overhaul MTTR of 300MW station boiler heat-exchange tube ithe result of calculation of historical data list in table 10;
Table 10:
Accident title MTTR i(h)
Economizer booster 90.19
Water-cooling wall booster 87.93
Superheater tubes burst 88.94
Reheater bursting 94.85
The 8th step and the 9th step: this 300MW station boiler heat-exchange tube dynamic security risk ranking is counted RPN icalculated value and the evaluation result of risk class list in table 11;
Table 11:
Heat-exchange tube position RPN i Risk class
Economizer booster 52.34 Slight risk
Water-cooling wall booster 242.62 Important risk
Superheater tubes burst 449.37 Serious risk
Reheater bursting 124.57 Ordinary risk
The tenth step and the 11 step: this 300MW station boiler heat-exchange tube is RPN in the maximum of the dynamic security risk ranking number in this moment max=449.37>236, has secondary risk, serious risk, and the pipe explosion accident of heat-exchange tube is superheater tubes burst, the security risk control measure of taking are to arrange ad hoc inspection and repair in three days, and superheater is checked comprehensively.
Adopt in-service monitoring and the control device of station boiler heat-exchange tube security risk provided by the invention, realized the online security risk sequence number that quantitatively calculates 300MW station boiler heat-exchange tube, according to the maximum dynamic security risk ranking number of station boiler heat-exchange tube, arrange ad hoc inspection and repair or the maintenance of C level, make the security risk of this 300MW station boiler heat-exchange tube in slave mode.

Claims (2)

1. in-service monitoring and the control device of a station boiler heat-exchange tube security risk, it is characterized in that, comprise boiler furnace pressure sensor (1), Level Measuring Equipment in Steam Drum (2), steam pressure sensor (3) after Control Stage of Steam Turbine, air-introduced machine ammeter (4), smoke moisture sensor (5), station boiler protection system in heat power engineering interface, calculation server, web page server and user side browser, boiler furnace pressure sensor (1) is located at horizontal flue upper wall surface and the lower wall surface of inverted U boiler, Level Measuring Equipment in Steam Drum (2) is located on drum, after Control Stage of Steam Turbine, steam pressure sensor (3) is located on steam turbine high-pressure cylinder, air-introduced machine ammeter (4) is located on the motor of air-introduced machine, smoke moisture sensor (5) is located on the surrounding furnace wall inwall of boiler back end ductwork, boiler furnace pressure sensor (1), Level Measuring Equipment in Steam Drum (2), steam pressure sensor (3) after Control Stage of Steam Turbine, air-introduced machine ammeter (4), smoke moisture sensor (5) all connects calculation server by station boiler protection system in heat power engineering interface, calculation server connects web page server, web page server connects user side browser.
2. security risk in-service monitoring and the control method of a station boiler heat-exchange tube, it is characterized in that, right to use requires in-service monitoring and the control device of the station boiler heat-exchange tube security risk described in 1, adopt the software for calculation of C language compilation station boiler heat-exchange tube security risk, operate on calculation server, be applied to station boiler heat-exchange tube security risk in-service monitoring and control, concrete steps are:
The first step: the accident probability F that calculates station boiler heat-exchange tube generation booster pi: use computer software, at the probability F of line computation station boiler i kind heat-exchange tube generation pipe explosion accident pi
In formula, n ifor the number of times of each i kind heat-exchange tube generation pipe explosion accident of this TV station station boiler, n 0ifor the historical data statistical value of the total degree of the corresponding i kind of existing same model station boiler heat-exchange tube generation pipe explosion accident in software data file, t ifor this TV station station boiler is from putting into operation to current calendar hourage, t 0istatistical value for the historical data of total calendar hourage of existing same model station boiler use in software data file;
Second step: in-service monitoring Pressure Signals in Furnace of Utility Boiler Using: adopt boiler furnace pressure sensor (1), in-service monitoring furnace of power-plant boilers pressure, according to the size of furnace pressure supervision value, the 1st FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 1be illustrated in table 1;
Table 1:
The 3rd step: in-service monitoring Water Level in Power Plant Boiler Drums signal: adopt Level Measuring Equipment in Steam Drum (2), the steam water-level of in-service monitoring dum boiler, according to the size of Water Level in Power Plant Boiler Drums supervision value, the 2nd FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 2be illustrated in table 2;
Table 2:
The 4th step: in-service monitoring station boiler main steam flow signal: steam pressure sensor (3) after employing Control Stage of Steam Turbine, steam pressure after in-service monitoring power station steam turbine governing stage, the relation being directly proportional to steam pressure after governing stage according to main steam flow, at line computation main steam flow, and according to main steam flow under identical unit load, increase the size of significantly supervision value, the 3rd FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 3be illustrated in table 3;
Table 3:
The 5th step: the current signal of in-service monitoring air-introduced machine motor: adopt air-introduced machine ammeter (4), the motor current of in-service monitoring station boiler air-introduced machine, according to the size of the supervision value of the motor current of station boiler air-introduced machine, the 4th FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence 4be illustrated in table 4;
Table 4:
The 6th step: in-service monitoring flue gas in power station boiler moisture signal: adopt smoke moisture sensor (5), in-service monitoring flue gas in power station boiler humidity, according to flue gas in power station boiler humidity, increase the size of the supervision value of percentage, the 5th FACTOR P of definition heat-exchange tube accident possibility occurrence 5be illustrated in table 5;
Table 5:
The 7th step: the mean time to overhaul MTTR that calculates heat-exchange tube i: use existing historical data in computer software, at the mean time to overhaul MTTR of line computation station boiler i kind heat-exchange tube generation pipe explosion accident i
In formula, τ 0itotal unplanned idle time of the station boiler causing for the corresponding i kind of the existing same model station boiler of software data file heat-exchange tube generation pipe explosion accident;
The 8th step: the dynamic security risk ranking that calculates station boiler heat-exchange tube is counted RPN i: use software for calculation, calculate the dynamic security risk ranking of station boiler i kind heat-exchange tube generation pipe explosion accident and count RPN i
The 9th step: evaluation station boiler heat-exchange tube security risk grade: according to the RPN of station boiler heat-exchange tube dynamic security risk ranking number isize, is divided into 5 grades the security risk of station boiler heat-exchange tube, represents table 6;
Table 6:
The tenth step: the maximum dynamic security risk ranking of determining station boiler heat-exchange tube is counted RPN max: adopt following formula, the maximum dynamic security risk ranking in the dynamic security risk ranking number of calculating station boiler heat-exchange tube is counted RPN max
The 11 step: the risk control measure of taking station boiler heat-exchange tube: count RPN according to the maximum dynamic security risk ranking of station boiler heat-exchange tube maxcalculated value, take following risk control measure countermeasure:
(1) if RPN max<72, there is Pyatyi risk, slight risk, acceptable risk, maintenance interval and the maintenance of maintenance content arrangement C level of pressing the overhaul of the equipments guide rule > > DL/T838 of < < electricity power enterprise regulation check comprehensively;
(2) if 72≤RPN max<168, there is level Four risk, ordinary risk, acceptable risk, arrange within this month to press in the C level maintenance of the overhaul of the equipments guide rule > > DL/T838 of < < electricity power enterprise regulation, check comprehensively;
(3) if 168≤RPN max<336, has tertiary risk, important risk, and unacceptable risk arranges ad hoc inspection and repair within this week, checks comprehensively;
(4) if 336≤RPN max<720, has secondary risk, serious risk, and unacceptable risk arranged ad hoc inspection and repair in three days, checked comprehensively;
(5) if RPN max>=720, there is prime risk, material risk, unacceptable risk, blowing out immediately arranges ad hoc inspection and repair, checks comprehensively.
CN201110413840.7A 2011-12-13 2011-12-13 Online monitoring and controlling device and method for safety risk of heat exchange tube of power station boiler Active CN102644912B (en)

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CN106195959A (en) * 2015-05-07 2016-12-07 北京兆阳光热技术有限公司 A kind of light thermo-power station heat collecting and circulating system
CN109696928B (en) * 2018-12-24 2021-07-30 西北化工研究院有限公司 Liquid level control system and method for heat recovery chamber of reaction furnace
CN109974027B (en) * 2019-02-22 2020-07-21 上海发电设备成套设计研究院有限责任公司 Method and device for online monitoring and controlling safety risk of coal electric boiler burner

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