CN102644912A - 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
CN102644912A
CN102644912A CN2011104138407A CN201110413840A CN102644912A CN 102644912 A CN102644912 A CN 102644912A CN 2011104138407 A CN2011104138407 A CN 2011104138407A CN 201110413840 A CN201110413840 A CN 201110413840A CN 102644912 A CN102644912 A CN 102644912A
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station boiler
exchange tube
heat
risk
boiler
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CN102644912B (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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Priority to CN201110413840.7A priority Critical patent/CN102644912B/en
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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 the station boiler technical 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 come the heating boiler feedwater, reduces exhaust gas temperature, improves boiler efficiency, the fuel savings consumption.The effect of water-cooling wall is to absorb the heat of furnace flame and flue gas and pass to the water in the 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 the steam turbine high-pressure cylinder steam discharge to be heated to superheated steam equate or close reheat temperature, and then delivers to the acting of expanding in Steam Turbine Through IP Admission and the 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 the accident characteristic signal with the accident probability, and the damage sequence of station boiler heat-exchange tube is relevant with repair time length.Existing station boiler protective system in heat power system has the online defencive functions such as motor current of furnace pressure, steam water-level, air-introduced machine, does not also have the in-service monitoring and control function of station boiler heat-exchange tube security risk.
Summary of the invention
The purpose of this invention is to provide station boiler heat-exchange tube security risk in-service monitoring and control device and method, realize the in-service monitoring and the control of station boiler heat-exchange tube security risk.
In order to realize above purpose; 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 steam pressure sensor after boiler furnace pressure sensor, drum level measurement device, the Control Stage of Steam Turbine, air-introduced machine ammeter, smoke moisture sensor, station boiler protective system in heat power system interface, calculation server, web page server and user side browser; The boiler furnace pressure sensor is located at the horizontal flue upper wall surface and the lower wall surface of inverted U boiler; The drum level measurement device is located on the drum, and the steam pressure sensor is located on the steam turbine high-pressure cylinder after the Control Stage of Steam Turbine, and the air-introduced machine ammeter is located on the motor of air-introduced machine; The smoke moisture sensor is located on the furnace wall inwall all around of boiler back end ductwork; Steam pressure sensor, air-introduced machine ammeter, smoke moisture sensor all connect calculation server through station boiler protective system in heat power system interface after boiler furnace pressure sensor, drum level measurement device, the Control Stage of Steam Turbine, and calculation server connects web page server, and web page server connects the 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 station boiler heat-exchange tube security risk, operate on the 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: the software that uses a computer, at the probability F of line computation station boiler i kind heat-exchange tube generation pipe explosion accident Pi
In the formula, n iBe the number of times of each i kind heat-exchange tube generation pipe explosion accident of this TV station station boiler, n 0iBe 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 the software data file, t iFor this TV station station boiler 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 the software data file;
Second step: in-service monitoring furnace of power-plant boilers pressure signal: adopt the boiler furnace pressure sensor, in-service monitoring furnace of power-plant boilers pressure, according to the size of furnace pressure monitoring 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 the drum level measurement device; The steam water-level of in-service monitoring dum boiler; According to the size of Water Level in Power Plant Boiler Drums monitoring 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 the employing Control Stage of Steam Turbine; Steam pressure behind the in-service monitoring power station steam turbine governing stage; The relation that is directly proportional according to steam pressure behind main steam flow and the governing stage; At the line computation main steam flow, and increase the size of the monitoring value of amplitude, the 3rd FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence according to main steam flow under the identical unit load 3Be illustrated in table 3;
Table 3:
The 5th step: the current signal of in-service monitoring air-introduced machine motor: adopt the air-introduced machine ammeter; The motor current of in-service monitoring station boiler air-introduced machine; According to the size of the monitoring 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 the smoke moisture sensor; In-service monitoring flue gas in power station boiler humidity; Increase the size of the monitoring value of percentage, the 5th FACTOR P of definition heat-exchange tube accident possibility occurrence according to flue gas in power station boiler humidity 5Be illustrated in table 5;
Table 5:
The 7th step: the mean time to overhaul MTTR that calculates heat-exchange tube i: historic data in the software that uses a computer, at the mean time to overhaul MTTR of line computation station boiler i kind heat-exchange tube generation pipe explosion accident i
In the formula, τ 0iTotal unplanned idle time of the station boiler that causes 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 the 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 to the security risk of station boiler heat-exchange tube, expression table 6;
Table 6:
The tenth step: the maximum dynamic security risk ordering number RPN that confirms the station boiler heat-exchange tube Max: adopt following formula, the maximum dynamic security risk ordering number RPN in the dynamic security risk ranking number of calculating station boiler heat-exchange tube Max
RPN max=max{RPN i}
The 11 step: the risk control measure of taking the station boiler heat-exchange tube: according to the maximum dynamic security risk ordering number RPN of station boiler heat-exchange tube MaxCalculated value, take following risk control measure countermeasure:
(1) if RPN Max<72, the Pyatyi risk is arranged, slight risk, acceptable risk by the maintenance interval and maintenance content arrangement C level maintenance (plan light maintenance) that " electricity power enterprise's overhaul of the equipments guide rule " /> (DLT838) stipulated, is checked comprehensively;
(2) if 72≤RPN Max<168, the level Four risk is arranged, ordinary risk, acceptable risk is arranged to check in the C level maintenance (plan light maintenance) within this month comprehensively;
(3) if 168≤RPN Max<336, tertiary risk is arranged, important risk, unacceptable risk is arranged ad hoc inspection and repair in this week, check comprehensively;
(4) if 336≤RPN Max<720, the secondary risk is arranged, serious risk, unacceptable risk was arranged ad hoc inspection and repair in three days, check comprehensively;
(5) if RPN Max>=720, prime risk is arranged, material risk, unacceptable risk, ad hoc inspection and repair is arranged in blowing out immediately, 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, realized station boiler heat-exchange tube security risk in line computation and control.When if station boiler heat-exchange tube dynamic security risk ranking number increases, overhaul through rational arrangement ad hoc inspection and repair or C level and to make the security risk of station boiler heat-exchange tube be in slave mode.
Description of drawings
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;
The computer software block diagram that Fig. 3 adopts for calculation server of the present invention;
Fig. 4 is the sketch map of station boiler heat-exchange tube security risk ordering number result of calculation.
The specific embodiment
Specify the present invention below in conjunction with embodiment.
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 by boiler furnace pressure sensor 1, drum level measurement device 2, Control Stage of Steam Turbine after steam pressure sensor 3, air-introduced machine ammeter 4, smoke moisture sensor 5, station boiler protective system in heat power system interface, calculation server, web page server and user side browser form; Horizontal flue upper wall surface and lower wall surface at the inverted U boiler are installed 3 boiler furnace pressure sensors 1 respectively; Drum level measurement device 2 (comprising that 1 overlaps water level meter, 3 cover differential pressure type level measurement devices and 3 cover electric pole type level measurement devices on the spot) is installed on drum; 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; The furnace wall inwall is installed 4 smoke moisture sensors 5 around boiler back end ductwork; Steam pressure sensor 3, air-introduced machine ammeter 4, smoke moisture sensor 5 all are connected calculation server with station boiler protective system in heat power system interface after boiler furnace pressure sensor 1, drum level measurement device 2, the Control Stage of Steam Turbine, and calculation server connects web page server, and web page server connects the 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 are installed on the calculation server of station boiler heat-exchange tube security risk ordering number, be applied to station boiler heat-exchange tube security risk in line computation and control.
For the subcritical 300MW control of certain model combined-circulation once-through boiler; The alarming value of furnace pressure is 0.996kPa; The steam water-level alarming value is-178mm; The alarming value that increases amplitude with main steam flow under the load is 2%, and 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 device shown in Figure 1, flow chart shown in Figure 2 and computer software shown in Figure 3, and Fig. 4 is the sketch map 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 at a time is following with the 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:
The 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 went on foot with the 3rd: the software that uses a computer, the FACTOR P that is worth going out by 300MW furnace of power-plant boilers pressure in-service monitoring 1The FACTOR P that draws with the steam water-level monitoring value 2Calculated value list in table 8;
Table 8:
The 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 the flue-gas temperature in-service monitoring 5Calculated value list in table 9;
Table 9:
The 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:
The accident title MTTR i(h)
The economizer booster 90.19
The water-cooling wall booster 87.93
The superheater booster 88.94
The reheater booster 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:
The heat-exchange tube position RPN i Risk class
The economizer booster 52.34 Slight risk
The water-cooling wall booster 242.62 Important risk
The superheater booster 449.37 Serious risk
The reheater booster 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, the secondary risk is arranged, serious risk, the pipe explosion accident of heat-exchange tube is the superheater booster, the security risk control measure of taking are to arrange ad hoc inspection and repair in three days, and superheater is checked comprehensively.
Adopt the in-service monitoring and the control device of station boiler heat-exchange tube security risk provided by the invention; Realized the security risk ordering number of online quantitative Analysis 300MW station boiler heat-exchange tube; Maximum dynamic security risk ordering number according to the station boiler heat-exchange tube is arranged ad hoc inspection and repair or the maintenance of C level, makes the security risk of this 300MW station boiler heat-exchange tube be in slave mode.

Claims (2)

1. the in-service monitoring and the control device of a station boiler heat-exchange tube security risk; It is characterized in that; Comprise steam pressure sensor (3) after boiler furnace pressure sensor (1), drum level measurement device (2), the Control Stage of Steam Turbine, air-introduced machine ammeter (4), smoke moisture sensor (5), station boiler protective system in heat power system interface, calculation server, web page server and user side browser; Boiler furnace pressure sensor (1) is located at the horizontal flue upper wall surface and the lower wall surface of inverted U boiler; Drum level measurement device (2) is located on the drum; Steam pressure sensor (3) is located on the steam turbine high-pressure cylinder after the Control Stage of Steam Turbine; Air-introduced machine ammeter (4) is located on the motor of air-introduced machine; Smoke moisture sensor (5) is located on the furnace wall inwall all around of boiler back end ductwork; Steam pressure sensor (3), air-introduced machine ammeter (4), smoke moisture sensor (5) all connect calculation server through station boiler protective system in heat power system interface after boiler furnace pressure sensor (1), drum level measurement device (2), the Control Stage of Steam Turbine, and calculation server connects web page server, and web page server connects the user side browser.
2. the security risk in-service monitoring and the control method of a station boiler heat-exchange tube; It is characterized in that; Use the in-service monitoring and the control device of the described station boiler heat-exchange tube of claim 1 security risk, adopt the software for calculation of C language station boiler heat-exchange tube security risk, operate on the 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: the software that uses a computer, at the probability F of line computation station boiler i kind heat-exchange tube generation pipe explosion accident Pi
In the formula, n iBe the number of times of each i kind heat-exchange tube generation pipe explosion accident of this TV station station boiler, n 0iBe 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 the software data file, t iFor this TV station station boiler 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 the software data file;
Second step: in-service monitoring furnace of power-plant boilers pressure signal: adopt boiler furnace pressure sensor (1); In-service monitoring furnace of power-plant boilers pressure; According to the size of furnace pressure monitoring 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 drum level measurement device (2); The steam water-level of in-service monitoring dum boiler; According to the size of Water Level in Power Plant Boiler Drums monitoring 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 the employing Control Stage of Steam Turbine; Steam pressure behind the in-service monitoring power station steam turbine governing stage; The relation that is directly proportional according to steam pressure behind main steam flow and the governing stage; At the line computation main steam flow, and increase the size of the monitoring value of amplitude, the 3rd FACTOR P of definition station boiler heat-exchange tube accident possibility occurrence according to main steam flow under the identical unit load 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 monitoring 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; Increase the size of the monitoring value of percentage, the 5th FACTOR P of definition heat-exchange tube accident possibility occurrence according to flue gas in power station boiler humidity 5Be illustrated in table 5;
Table 5:
The 7th step: the mean time to overhaul MTTR that calculates heat-exchange tube i: historic data in the software that uses a computer, at the mean time to overhaul MTTR of line computation station boiler i kind heat-exchange tube generation pipe explosion accident i
In the formula, τ 0iTotal unplanned idle time of the station boiler that causes 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 the 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 to the security risk of station boiler heat-exchange tube, expression table 6;
Table 6:
The tenth step: the maximum dynamic security risk ordering number RPN that confirms the station boiler heat-exchange tube Max: adopt following formula, the maximum dynamic security risk ordering number RPN in the dynamic security risk ranking number of calculating station boiler heat-exchange tube Max
RPN max=max{RPN i}
The 11 step: the risk control measure of taking the station boiler heat-exchange tube: according to the maximum dynamic security risk ordering number RPN of station boiler heat-exchange tube MaxCalculated value, take following risk control measure countermeasure:
(1) if RPN Max<72, the Pyatyi risk is arranged, slight risk, acceptable risk by the maintenance interval and the maintenance of maintenance content arrangement C level of " electricity power enterprise's overhaul of the equipments guide rule " /> DLT838 regulation, is checked comprehensively;
(2) if 72≤RPN Max<168, the level Four risk is arranged, ordinary risk, acceptable risk is arranged to check in the C level maintenance (plan light maintenance) within this month comprehensively;
(3) if 168≤RPN Max<336, tertiary risk is arranged, important risk, unacceptable risk is arranged ad hoc inspection and repair in this week, check comprehensively;
(4) if 336≤RPN Max<720, the secondary risk is arranged, serious risk, unacceptable risk was arranged ad hoc inspection and repair in three days, check comprehensively;
(5) if RPN Max>=720, prime risk is arranged, material risk, unacceptable risk, ad hoc inspection and repair is arranged in blowing out immediately, 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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Publication number Priority date Publication date Assignee Title
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
CN109696928A (en) * 2018-12-24 2019-04-30 西北化工研究院有限公司 A kind of reacting furnace heat recovery chamber tank level control system and method
CN109974027A (en) * 2019-02-22 2019-07-05 上海发电设备成套设计研究院有限责任公司 A kind of coal grill pan burner security risk in-service monitoring control method and device

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CN201397466Y (en) * 2009-05-22 2010-02-03 赵斌 System for synchronously optimizing, simulating and monitoring operation states of thermal power units
CN101763089A (en) * 2009-12-14 2010-06-30 江西省电力科学研究院 Output optimal operation method of thermal power unit based on electricity marketization environment

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Publication number Priority date Publication date Assignee Title
CN1845029A (en) * 2005-11-11 2006-10-11 南京科远控制工程有限公司 Setting method for fault diagnosis and accident prediction
JP2008146371A (en) * 2006-12-11 2008-06-26 Hitachi Ltd Controller of boiler plant
CN101270872A (en) * 2008-05-01 2008-09-24 刘德胜 Combustion energy-saving automatic control device of coal-burning chain boiler
CN101387616A (en) * 2008-10-09 2009-03-18 聚光科技(杭州)有限公司 Measurement method and apparatus for humidity in discharged flue gas
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109696928A (en) * 2018-12-24 2019-04-30 西北化工研究院有限公司 A kind of reacting furnace heat recovery chamber tank level control system and method
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
CN109974027A (en) * 2019-02-22 2019-07-05 上海发电设备成套设计研究院有限责任公司 A kind of coal grill pan burner security risk in-service monitoring control method and device

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