CN115440011B - Multi-parameter coupling main reheat steam temperature abnormality early warning system and method - Google Patents
Multi-parameter coupling main reheat steam temperature abnormality early warning system and method Download PDFInfo
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- G—PHYSICS
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- G—PHYSICS
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Abstract
The invention provides a multi-parameter coupling main reheat steam temperature abnormality early warning system and a method, wherein the system comprises an I/O module, a CPU module, a function switching module and an early warning module; the I/O module is used for acquiring main reheating system parameters of the unit; the CPU module is used for processing parameters of a main reheating system of the unit; the CPU module calculates early warning parameters of the main reheating system of the unit according to the parameters of the main reheating system of the unit, compares the early warning parameters of the main reheating system of the unit with set conditions, determines the steam temperature state of the unit, and generates early warning signals according to the steam temperature state of the unit and outputs the early warning signals to the early warning module. The invention can trigger an alarm before the abnormality of the main reheat steam temperature, and remind operators to dry the preset unit parameters in time, thereby avoiding the occurrence of steam temperature abnormality, greatly reducing the influence of steam temperature abnormality on the service life of a heating surface pipeline, and having remarkable safety benefit and economic benefit.
Description
Technical Field
The invention relates to the technical field of automatic control of thermal power generation, in particular to a multi-parameter coupling main reheat steam temperature abnormality early warning system and method.
Background
For the central control operation profession of the thermal power plant, except for equipment exception handling, the most abnormal event of the main reheat steam temperature occurs at ordinary times, and the abnormal main reheat steam temperature has a great influence on the service life of each heating surface. The main reheat steam temperature abnormality alarm of the DCS system is simpler, the warning of the optical word plate is triggered when the main reheat air temperature reaches a certain value, but the warning is too late for the steam temperature abnormality event, and the possibility of avoiding the occurrence of the main reheat steam temperature abnormality is very low.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-parameter coupling main reheat steam temperature abnormality early warning system and a method.
The multi-parameter coupling main reheat steam temperature abnormality early warning system comprises an I/O module, a CPU module, a function switching module and an early warning module;
the I/O module is used for acquiring main reheating system parameters of the unit;
the CPU module is used for processing parameters of the main reheating system of the unit; the CPU module calculates early warning parameters of the main reheating system of the unit according to the parameters of the main reheating system of the unit, compares the early warning parameters of the main reheating system of the unit with set conditions, determines the steam temperature state of the unit, and outputs early warning signals to the early warning module according to the steam temperature state of the unit;
the function switching module is used for switching in and switching out of the unit;
The I/O module and the acousto-optic early warning module are respectively connected with the CPU module through electrical signals; the function switching module is electrically connected with the I/O module.
In a second aspect, a multi-parameter coupling main reheat steam temperature anomaly early warning method includes:
acquiring main reheating system parameters of a unit;
according to the main reheating system parameters of the unit, the early warning parameters of the main reheating system of the unit are calculated;
comparing the early warning parameters of the main reheating system of the unit with set conditions to determine the steam temperature state of the unit;
generating an early warning signal according to the steam temperature state of the unit;
Early warning is carried out according to the early warning signal;
and the system controls the unit to be put into or out of operation according to the early warning signal.
The beneficial effects of the invention are as follows: the invention can trigger an alarm before the abnormality of the main reheat steam temperature, and remind operators to dry the preset unit parameters in time, thereby avoiding the occurrence of steam temperature abnormality, greatly reducing the influence of steam temperature abnormality on the service life of a heating surface pipeline, and having remarkable safety benefit and economic benefit.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the main reheating system parameters of the unit comprise real-time main steam pressure of the unit, sliding pressure reference main steam pressure of the unit, primary temperature reduction water flow of a superheater, real-time load of the unit and actual coal quantity of the unit; the main reheating system early warning parameters comprise the steam temperature and the steam temperature dropping rate of the unit, the excessive adding/subtracting coal amount of the unit in the first period, the pressure deviation of the unit, the primary temperature reducing water flow of the superheater and the excessive adding/subtracting coal amount of the unit in the second period.
Further, the calculation process of the coal adding/subtracting amount of the first period of the unit comprises the following steps:
acquiring a first function of the real-time load of the unit changing along with time and a second function of the actual coal quantity of the unit changing along with time t;
Determining a third function of the theoretical coal quantity of the unit load over time according to the first function;
The coal adding/subtracting amount of the first time period of the unit is the difference between the second function and the third function, and a fourth function is obtained;
and solving the fourth function to obtain the excessive coal adding/subtracting quantity of the unit in the first period.
Further, the set conditions comprise a low steam temperature early warning condition and an ultra steam temperature early warning condition; when the early warning parameters of the main reheating system of the unit meet the low steam temperature early warning conditions, the steam temperature state of the unit is a low air temperature state; when the pre-warning parameters of the main reheating system of the unit meet the super-steam temperature pre-warning conditions, the steam temperature state of the unit is the super-steam temperature state;
the low steam temperature early warning condition is: the steam temperature of the unit is smaller than a first set value, the steam temperature falling rate is larger than a second set value, the coal reduction amount of the unit in a first period of time is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is smaller than a fifth set value, and the coal reduction amount of the unit in a second period of time is larger than a sixth set value;
The super steam temperature early warning condition is: the steam temperature of the unit is smaller than a seventh set value, the steam temperature rising rate is larger than a second set value, the overfeeding coal amount of the unit in a first period is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is larger than an eighth set value, and the overfeeding coal amount of the unit in a second period is larger than a sixth set value.
Further, the main reheating system parameters of the unit are obtained from a DCS system.
Further, the CPU module is connected with a communication module.
Further, the CPU module is connected with a memory; the memory is used for recording action events of the unit; the steam temperature state data of the unit, the input and output data of the unit and the audible and visual alarm time data.
Further, the early warning module is an audible and visual alarm.
Drawings
FIG. 1 is a schematic diagram of a multi-parameter coupling main reheat steam temperature abnormality warning system provided in embodiment 1 of the present invention;
FIG. 2 is a logic schematic diagram of low steam temperature early warning in embodiment 1 of the present invention;
FIG. 3 is a logic schematic diagram of the super-steam temperature early warning in embodiment 1 of the present invention;
FIG. 4 is a flowchart of a multi-parameter coupling main reheat steam temperature abnormality warning method provided in embodiment 2 of the present invention;
FIGS. 5, 9, 13 and 17 are graphs of unit loads during actual operation;
Fig. 6, 10, 14 and 18 are graphs of actual coal quantity of the unit and coal quantity corresponding to load in actual operation process;
FIGS. 7, 11, 15, and 19 are graphs of actual main pressure versus slip pressure reference main pressure during actual operation;
Fig. 8, 12, 16 and 20 are graphs of main steam temperature, reheat steam temperature and main steam temperature after low steam temperature in actual operation.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
As an embodiment, as shown in FIG. 1, to solve the above technical problems, the embodiment provides a multi-parameter coupling main reheat steam temperature abnormality early warning system, which comprises an I/O module, a CPU module, a function switching module and an early warning module;
The I/O module is used for acquiring main reheating system parameters of the unit;
The CPU module is used for processing parameters of a main reheating system of the unit; the CPU module calculates early warning parameters of the main reheating system of the unit according to the parameters of the main reheating system of the unit, compares the early warning parameters of the main reheating system of the unit with set conditions, determines the steam temperature state of the unit, and outputs early warning signals to the early warning module according to the steam temperature state of the unit;
The functional switching module is used for switching in and switching out the unit;
the I/O module and the acousto-optic early warning module are respectively connected with the CPU module through electrical signals; the function switching module is electrically connected with the I/O module.
Optionally, the main reheating system parameters of the unit comprise real-time main steam pressure of the unit, sliding pressure reference main steam pressure of the unit, primary temperature reduction water flow of a superheater, real-time load of the unit and actual coal quantity of the unit; the early warning parameters of the main reheating system comprise the steam temperature and the steam temperature dropping rate of the unit, the excessive adding/subtracting coal amount of the unit in the first period, the pressure deviation of the unit, the primary temperature reducing water flow of the superheater and the excessive adding/subtracting coal amount of the unit in the second period.
In the actual application process, the real-time main steam pressure of the unit is a function changing along with time t, and is set as P (t) and the unit is megapascal Mpa; the unit slip pressure reference main steam pressure is a function changing along with time t, and is set as p (t), and the unit megapascal Mpa; the flow rate of the primary desuperheating water of the superheater is a function changing along with time t and is set as J (t) and is expressed in megapascal t/h.
Unit pressure deviation:
optionally, the calculation process of the coal adding/subtracting amount in the first period of the unit is as follows:
acquiring a first function of the real-time load of the unit changing along with time and a second function of the actual coal quantity of the unit changing along with time t;
Determining a third function of the theoretical coal quantity of the unit load over time according to the first function;
The coal adding/subtracting amount of the first time period of the unit is the difference between the second function and the third function, so as to obtain a fourth function;
and solving a fourth function to obtain the coal adding/subtracting amount of the first time period of the unit.
In the actual application process, the real-time load of the unit is a first function changing along with time t, and is set as W (t) and MW is set as a unit megawatt; the actual coal quantity of the unit is a second function which changes along with time t, and is set as f (t), and the unit ton/hour t/h; the theoretical coal quantity of unit load is a third function which changes along with time t, g (t) is set as t/h of unit ton/h, and then:
g(t)＝W(t)×1.625/3.6；
Let Δq=f (t) -g (t);
Then the unit coal quantity is over-added with a criterion: Δq >4, let t 1＝0,t2＝t1+60,t3＝t1 +120; the first time period t 1 to t 2 unit overfeeding coal amount: The second time period t 1 to t 3 unit overcoal amount: /(I)
Unit coal quantity over-reduction criterion: Δq >4, the first time period unit over-abate coal amount: the unit excess coal reduction amount in the second time period: /(I)
Calculating an integral by using a complex trapezoidal product formula, wherein T k represents the integral value over a subinterval (x k,xk+1); t n denotes the integrated value over subinterval (a, b), then:
wherein h= (b-a)/n; x k = a + kH, (k = 0,1,2,3, …, n);
namely:
Or:
Where n=60 is calculated for the intervals [ t1, t2], and n=120 is calculated for the intervals [ t1, t3], so that the cut-off error is negligible in 1 part per second.
Optionally, the set conditions include a low steam temperature early warning condition and an ultra steam temperature early warning condition; when the early warning parameters of the main reheating system of the unit meet the low steam temperature early warning conditions, the steam temperature state of the unit is a low air temperature state; when the pre-warning parameters of the main reheating system of the unit meet the super-steam temperature pre-warning conditions, the steam temperature state of the unit is the super-steam temperature state;
The low steam temperature early warning condition is: the steam temperature of the unit is smaller than a first set value, the steam temperature falling rate is larger than a second set value, the coal reduction amount of the unit in the first period is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is smaller than a fifth set value, and the coal reduction amount of the unit in the second period is larger than a sixth set value;
The super steam temperature early warning condition is: the steam temperature of the unit is smaller than a seventh set value, the steam temperature rising rate is larger than a second set value, the coaling quantity of the unit in a first period is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is larger than an eighth set value, and the coaling quantity of the unit in a second period is larger than a sixth set value.
In the practical application process, the first set value is 405 ℃, the second set value is 0.04 ℃/s, the third set value is 4, the fourth set value is 7%, the fifth set value is 10, the sixth set value is 8, the seventh set value is 450 ℃, and the eighth set value is 50.
The specific low steam temperature early warning conditions are as follows:
Condition 1: the steam temperature of the unit is less than 405 ℃ and the steam temperature falling rate is more than 0.04 ℃/s;
condition 2: the coal reduction quantity Q 1 of the first period of the unit is more than 4;
condition 3: the unit pressure deviation delta P is more than 7%;
condition 4: the primary de-icing water flow J (t) of the superheater is smaller than 10;
condition 5: the coal quantity Q 2 of the second period of the unit is more than 8;
As shown in figure 2, when the unit meets the conditions 1-4 and simultaneously meets the condition 5, the low steam temperature early warning condition is met.
The specific super steam temperature early warning conditions are as follows:
Condition 6: the steam temperature of the unit is less than 450 ℃ and the steam temperature falling rate is more than 0.04 ℃/s;
condition 7: the coal reduction quantity Q 3 of the first period of the unit is more than 4;
Condition 8: the unit pressure deviation delta P is more than 7%;
condition 9: the primary de-superheating water flow J (t) of the superheater is more than 50;
condition 10: the coaling quantity Q 4 in the second period of the unit is more than 8;
As shown in figure 3, when the unit meets the conditions 1-4 and simultaneously meets the condition 5, the super-steam temperature early warning condition is met.
Optionally, the main reheat system parameter of the unit is obtained from the DCS system.
After the steam temperature abnormality alarm is triggered, an operator on duty can timely adjust the actual coal quantity of the unit according to the corresponding relation between the load and the coal quantity, and timely take intervention measures to avoid the occurrence of steam temperature abnormality events.
Optionally, the CPU module is connected with a communication module.
In the practical application process, the communication module adopts a wired data transmission or wireless data transmission mode, for example, the wired data transmission mode adopts an RS232 module or an RS 232-to-RS 485 module, and the wireless data transmission mode adopts a 4G module or a Bluetooth module or a WiFi module, so that remote data transmission can be realized on unit data acquired through a DCS system, and meanwhile, remote early warning can also be realized.
Optionally, the CPU module is connected with a memory; the memory is used for recording action events of the unit; steam temperature state data of the unit, input and exit data of the unit and audible and visual alarm time data.
In the practical application process, the memory can record the steam temperature state data, the input and output data and the audible and visual alarm time data of the unit, and simultaneously record the action event of the unit, thereby being beneficial to monitoring the running state of the unit and inquiring the reason of the occurrence of the event after the occurrence of the unexpected event.
Optionally, the early warning module is an audible and visual alarm.
In the practical application process, the audible and visual alarm can inform personnel of the impending steam temperature abnormal event in an audible and visual mode.
Example 2
Based on the same principle as the system shown in the embodiment 1 of the present invention, the embodiment of the present invention further provides a multi-parameter coupling main reheat steam temperature abnormality early warning method, as shown in fig. 4, including:
acquiring main reheating system parameters of a unit;
According to the parameters of the main reheating system of the unit, the early warning parameters of the main reheating system of the unit are calculated;
comparing the early warning parameters of the main reheating system of the unit with set conditions to determine the steam temperature state of the unit;
generating an early warning signal according to the steam temperature state of the unit;
Early warning is carried out according to the early warning signal;
and the system control controls the unit to be put into or out of operation according to the early warning signal.
As shown in fig. 5-8, fig. 9-12, fig. 13-16, and fig. 17-20, the main reheat steam temperature anomaly event curve in four actual runs. S1, S8, S15 and S22 are actual coal amounts of the unit, S2, S9, S16 and S23 are load corresponding coal amounts, and S3, S10, S17 and S24 are actual main steam pressures; s4, S11, S18 and S25 are slip pressure reference main steam pressure; s5, S12, S19 and S26 are the main steam temperature after the low steam temperature; s6, S13, S20 and S27 are reheat steam temperatures; s7, S14, S21 and S28 are main steam temperatures. According to the graph, the early warning system can trigger an alarm before the abnormal steam temperature occurs, reminds operators to intervene in time, and greatly reduces the occurrence probability of main reheat steam temperature abnormal events.
The invention can trigger an alarm before the abnormality of the main reheat steam temperature, and remind operators to dry the preset unit parameters in time, thereby avoiding the occurrence of steam temperature abnormality, greatly reducing the influence of steam temperature abnormality on the service life of a heating surface pipeline, and having remarkable safety benefit and economic benefit.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The multi-parameter coupling main reheat steam temperature abnormality early warning system is characterized by comprising an I/O module, a CPU module, a function switching module and an early warning module;
The I/O module is used for acquiring main reheating system parameters of the unit; the main reheating system parameters of the unit comprise real-time main steam pressure of the unit, sliding pressure reference main steam pressure of the unit, primary temperature reduction water flow of a superheater, real-time load of the unit and actual coal quantity of the unit; the real-time main steam pressure of the unit is a function changing along with time t, and is set as P (t) and the unit megapascal Mpa; the unit slip pressure reference main steam pressure is a function changing along with time t, and is set as p (t), and the unit megapascal Mpa; the primary de-superheating water flow of the superheater is a function changing along with time t, and is set as J (t), unit megapascal t/h, and unit pressure deviation is as follows:
；
The CPU module is used for processing parameters of the main reheating system of the unit; the CPU module calculates early warning parameters of the main reheating system of the unit according to the parameters of the main reheating system of the unit, compares the early warning parameters of the main reheating system of the unit with set conditions, determines the steam temperature state of the unit, and generates early warning signals according to the steam temperature state of the unit and outputs the early warning signals to the early warning module; the main reheating system early warning parameters comprise the steam temperature and the steam temperature reduction rate of the unit, the excessive adding/subtracting coal amount of the unit in a first period, the pressure deviation of the unit, the primary temperature reduction water flow of the superheater and the excessive adding/subtracting coal amount of the unit in a second period;
The set conditions comprise low steam temperature early warning conditions and super steam temperature early warning conditions; when the early warning parameters of the main reheating system of the unit meet the low steam temperature early warning conditions, the steam temperature state of the unit is a low air temperature state; when the pre-warning parameters of the main reheating system of the unit meet the super-steam temperature pre-warning conditions, the steam temperature state of the unit is the super-steam temperature state;
the low steam temperature early warning condition is: the steam temperature of the unit is smaller than a first set value, the steam temperature falling rate is larger than a second set value, the coal reduction amount of the unit in a first period of time is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is smaller than a fifth set value, and the coal reduction amount of the unit in a second period of time is larger than a sixth set value;
the super steam temperature early warning condition is: the steam temperature of the unit is smaller than a seventh set value, the steam temperature rising rate is larger than the second set value, the overfeeding coal amount of the unit in a first period is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is larger than an eighth set value, and the overfeeding coal amount of the unit in a second period is larger than a sixth set value;
The calculation process of the coal adding/subtracting amount of the first time period of the unit comprises the following steps: acquiring a first function of the real-time load of the unit changing along with time and a second function of the actual coal quantity of the unit changing along with time t; determining a third function of the theoretical coal quantity of the unit load over time according to the first function; subtracting the third function from the second function to obtain a fourth function; obtaining the coal adding/subtracting amount of the unit in the first period according to the fourth function;
The real-time load of the unit is a first function changing along with time t, and is set as W (t), and the unit megawatt MW; the actual coal quantity of the unit is a second function changing along with the time t and is set as T/h in tons/hour; the theoretical coal quantity of the unit load is a third function changing along with time t and is set as/>Let the fourth function be/>, t/h per ton/hourThen:
；
Order the ; Then the unit coal quantity is over-added with a criterion: /(I)4, Let t 1=0,t2=t1+60,t3=t1 +120; the first time period t 1 to t 2 unit overfeeding coal amount: /(I); The second time period t 1 to t 3 unit overcoal amount: /(I)；
Unit coal quantity over-reduction criterion: 4, excessive coal reduction amount of the first time period unit: /(I) ; The unit excess coal reduction amount in the second time period: /(I)；
Calculating an integral by adopting a complex trapezoid product formula,Expressed in subintervals/>Integral value of the upper; /(I)Expressed in subintervals/>Integral value of the upper; let/>Representation/>Time-of-day unit actual coal quantity minus/>A difference value obtained by the theoretical coal quantity of the unit load at moment; /(I)Representation/>Time-of-day unit actual coal quantity minus/>A difference value obtained by the theoretical coal quantity of the unit load at moment; /(I)Representation/>Time-of-day unit actual coal quantity minus/>A difference value obtained by the theoretical coal quantity of the unit load at moment; n represents dividing the integration interval, i.e., time, into n equal parts when calculating the integration value; /(I)The difference value obtained by subtracting the theoretical coal quantity of the unit load at the moment a from the actual coal quantity of the unit at the moment a is represented; /(I)The difference value obtained by subtracting the unit load theoretical coal quantity at the moment b from the unit actual coal quantity at the moment b is represented; then:
；
Wherein, ；/>，/>；
；
Namely:
Or:
；
Wherein, when the interval [ t 1,t2 ] is calculated, n=60, and when the interval [ t 1,t3 ] is calculated, n=120, so that each second is divided into 1 part, and the cut-off error is ignored;
the function switching module is used for switching in and switching out of the unit;
the I/O module and the early warning module are respectively connected with the CPU module through electrical signals; the function switching module is electrically connected with the I/O module.
2. The multi-parameter coupling main reheat steam temperature abnormality pre-warning system according to claim 1, wherein the unit main reheat system parameter obtaining mode is obtained from a DCS system.
3. The multi-parameter coupled main reheat steam temperature anomaly early warning system of claim 1, wherein the CPU module is connected with a communication module.
4. The multi-parameter coupling main reheat steam temperature abnormality warning system of claim 1, wherein the CPU module is connected with a memory; the memory is used for recording action events of the unit: the steam temperature state data of the unit, the input and output data of the unit and the audible and visual alarm time data.
5. The multi-parameter coupled main reheat steam temperature anomaly early warning system of claim 1, wherein the early warning module is an audible and visual alarm.
6. The multi-parameter coupling main reheat steam temperature abnormality early warning method is characterized by comprising the following steps of:
Acquiring main reheating system parameters of a unit; the main reheating system parameters of the unit comprise real-time main steam pressure of the unit, sliding pressure reference main steam pressure of the unit, primary temperature reduction water flow of a superheater, real-time load of the unit and actual coal quantity of the unit; the real-time main steam pressure of the unit is a function changing along with time t, and is set as P (t) and the unit megapascal Mpa; the unit slip pressure reference main steam pressure is a function changing along with time t, and is set as p (t), and the unit megapascal Mpa; the primary de-superheating water flow of the superheater is a function changing along with time t, and is set as J (t), unit megapascal t/h, and unit pressure deviation is as follows:
；
According to the main reheating system parameters of the unit, the early warning parameters of the main reheating system of the unit are calculated; the main reheating system early warning parameters comprise the steam temperature and the steam temperature reduction rate of the unit, the excessive adding/subtracting coal amount of the unit in a first period, the pressure deviation of the unit, the primary temperature reduction water flow of the superheater and the excessive adding/subtracting coal amount of the unit in a second period;
The calculation process of the coal adding/subtracting amount of the first time period of the unit comprises the following steps: acquiring a first function of the real-time load of the unit changing along with time and a second function of the actual coal quantity of the unit changing along with time t; determining a third function of the theoretical coal quantity of the unit load over time according to the first function; subtracting the third function from the second function to obtain a fourth function; obtaining the coal adding/subtracting amount of the unit in the first period according to the fourth function;
The real-time load of the unit is a first function changing along with time t, and is set as W (t), and the unit megawatt MW; the actual coal quantity of the unit is a second function changing along with the time t and is set as T/h in tons/hour; the theoretical coal quantity of the unit load is a third function changing along with time t and is set as/>Let the fourth function be/>, t/h per ton/hourThen:
；
Order the ; Then the unit coal quantity is over-added with a criterion: /(I)4, Let t 1=0,t2=t1+60,t3= t1 +120; the first time period t 1 to t 2 unit overfeeding coal amount: /(I); The second time period t 1 to t 3 unit overcoal amount: /(I)；
Unit coal quantity over-reduction criterion: 4, excessive coal reduction amount of the first time period unit: /(I) ; The unit excess coal reduction amount in the second time period: /(I)；
Calculating an integral by adopting a complex trapezoid product formula,Expressed in subintervals/>Integral value of the upper; /(I)Expressed in subintervals/>Integral value of the upper; let/>Representation/>Time-of-day unit actual coal quantity minus/>A difference value obtained by the theoretical coal quantity of the unit load at moment; /(I)Representation/>Time-of-day unit actual coal quantity minus/>A difference value obtained by the theoretical coal quantity of the unit load at moment; /(I)Representation/>Time-of-day unit actual coal quantity minus/>A difference value obtained by the theoretical coal quantity of the unit load at moment; n represents dividing the integration interval, i.e., time, into n equal parts when calculating the integration value; /(I)The difference value obtained by subtracting the theoretical coal quantity of the unit load at the moment a from the actual coal quantity of the unit at the moment a is represented; /(I)The difference value obtained by subtracting the unit load theoretical coal quantity at the moment b from the unit actual coal quantity at the moment b is represented; then:
；
Wherein, ；/>，/>；
；
Namely:
Or:
；
Wherein, when the interval [ t 1,t2 ] is calculated, n=60, and when the interval [ t 1,t3 ] is calculated, n=120, so that each second is divided into 1 part, and the cut-off error is ignored;
comparing the early warning parameters of the main reheating system of the unit with set conditions to determine the steam temperature state of the unit;
The set conditions comprise low steam temperature early warning conditions and super steam temperature early warning conditions; when the early warning parameters of the main reheating system of the unit meet the low steam temperature early warning conditions, the steam temperature state of the unit is a low air temperature state; when the pre-warning parameters of the main reheating system of the unit meet the super-steam temperature pre-warning conditions, the steam temperature state of the unit is the super-steam temperature state;
the low steam temperature early warning condition is: the steam temperature of the unit is smaller than a first set value, the steam temperature falling rate is larger than a second set value, the coal reduction amount of the unit in a first period of time is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is smaller than a fifth set value, and the coal reduction amount of the unit in a second period of time is larger than a sixth set value;
the super steam temperature early warning condition is: the steam temperature of the unit is smaller than a seventh set value, the steam temperature rising rate is larger than the second set value, the overfeeding coal amount of the unit in a first period is larger than a third set value, the pressure deviation of the unit is larger than a fourth set value, the primary temperature reduction water flow of the superheater is larger than an eighth set value, and the overfeeding coal amount of the unit in a second period is larger than a sixth set value;
generating an early warning signal according to the steam temperature state of the unit;
Early warning is carried out according to the early warning signal;
and the system controls the unit to be put into or out of operation according to the early warning signal.
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