CN115235537A - Power plant coal consumption monitoring method and monitoring system - Google Patents
Power plant coal consumption monitoring method and monitoring system Download PDFInfo
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Abstract
The invention discloses a power plant coal consumption monitoring method, which comprises the following steps: calculating a load correction factor C fh Boiler side coal consumption deviation index B gl Deviation index B of coal consumption of steam turbine side qj And calculating the coal consumption deviation index B at the boiler side gl Deviation index B of coal consumption on steam turbine side qj And the real-time coal consumption deviation and B are obtained f (ii) a Calculating the comprehensive plant power rate L cy ，L cy ＝(Q f +Q wj +Q kj )/W sf (ii) a Calculating to obtain a real-time coal consumption index value B g ，B g ＝B f /(1‑L cy ) Finally, the real-time coal consumption index value B g And (5) monitoring. A power plant coal consumption monitoring system comprises an instantaneous power supply and heat supply total coal consumption monitoring module, an average power supply and heat supply total coal consumption monitoring module and a display moduleAnd (5) blocking. The invention provides a power plant coal consumption monitoring method and a monitoring system which are simple, easy to popularize and strong in practicability, and can accurately acquire and display information influencing coal consumption, and timely adjust parameters, so that the economical efficiency is improved.
Description
Technical Field
The invention relates to a method for monitoring coal consumption of a power plant, which is mainly applied to the technical field of power generation and energy conservation; also relates to a monitoring system using the power plant coal consumption monitoring method.
Background
With the expansion of the power generation scale of new energy resources such as photovoltaic energy, solar energy, nuclear energy and the like and the deepening of emission reduction work, the load rate of the traditional thermal power generating unit is lower and lower, so that how to operate the unit under the optimal working condition, reduce the total coal consumption of power supply and heat supply and improve the operation benefit of the whole plant is the most concerned problem of power generation enterprises. In a thermal power generation system, an important step is to manage and monitor a thermal power generation set at a power generation site in real time, and an operator needs to make each thermal power generation set at the power generation site operate in a normal operating state and preferably make parameters of each thermal power generation set at the power generation site operate in an operating state of a standard value of the parameter, so that the purpose of not only prolonging the service life of each thermal power generation set, but also greatly reducing the energy consumption of each thermal power generation set is achieved.
In the prior art, workers generally rely on personal working experience to check the reasons possibly influencing the total coal consumption of power supply and heat supply, and then check the relevant reasons possibly influencing the total coal consumption of power supply and heat supply one by one according to the experience until the reason really influencing the total coal consumption of power supply and heat supply is found and eliminated, so that the total coal consumption of power supply and heat supply of the thermal generator set is reduced. Because the external environment around the thermal generator set at a power generation site is generally complex, the temperature and the radiation are high, the traditional site manual maintenance management mode is not adapted any more, and the original analysis system generally only has single analysis of power supply or heat supply and does not have a total simplified analysis model of the whole plant for summarizing power supply and heat supply. In order to know the operation state of the thermal generator set at the power generation site anytime and anywhere, complete maintenance management tasks which may be needed, and improve the response speed of fault handling of the thermal generator set, a safe and reliable thermal generator set operation optimization management control system and a solution thereof are urgently needed, wherein the labor cost can be reduced, the number of times of site maintenance can be reduced or avoided, and the maintenance cost and the fault handling time can be saved.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention aims to: the power plant coal consumption monitoring method and the power plant coal consumption monitoring system can accurately acquire and display information influencing coal consumption, and timely adjust parameters, so that the economy is improved.
In order to achieve the purpose, the invention provides the following technical scheme:
a power plant coal consumption monitoring method comprises the following steps: s1, monitoring real-time load C of generator in real time sj And calculating the deviation value of the load correction coefficient C from the standard value thereof to obtain a load correction coefficient C fh (ii) a S2, real-time monitoring of real power W of the generator sf Main steam temperature T zq Oxygen amount O yl And temperature T of exhaust gas py One or more of them, combined with a load correction factor C fh Calculating the deviation values of the coal consumption and the standard values, and summing to obtain a boiler side coal consumption deviation index B gl (ii) a S3, monitoring the main steam pressure P in real time qy Vacuum degree P of condenser on side of steam turbine zk Pressure of heat supply P gr And the temperature T of feed water gs One or more of them, combined with a load correction factor C fh Calculating the deviation values of the coal consumption and the standard value of the standard value, and summing to obtain a coal consumption deviation index B of the steam turbine side qj (ii) a S4, calculating a boiler side coal consumption deviation index B gl Deviation index B of coal consumption on steam turbine side qj And obtaining the real-time coal consumption deviation and B f (ii) a S5, calculating the comprehensive plant power consumption L cy The calculation formula is as follows:
L cy ＝(Q f +Q wj +Q kj )/W sf (13)
wherein Q is f Non-productive electricity consumption per week basis, Q, updated in real time according to gateway meters wj For not counting the power consumption of production, Q kj The statistical production electricity is calculated according to the current of the high-low voltage motor displayed by the existing current;
s6, according to the steps S4 and S5Calculating to obtain real-time coal consumption index value B g The calculation formula is as follows:
B g ＝B f /(1-L cy ) (14)
finally, the real-time coal consumption index value B is calculated g And (5) monitoring. The method has the beneficial effects that the real-time coal consumption index value B is obtained by calculating the deviation of each parameter and the optimal value g And the real-time display is provided for operators to refer to so as to make adjustment in time, on one hand, the economical efficiency of the coal consumption of the power plant is improved, and on the other hand, the coal consumption monitoring system of the power plant provided by the invention has the advantages of simple structure, easy popularization and strong practicability
Comprising the step S7: calculating average coal consumption index value B in T time dz The calculation formula is as follows:
finally, the real-time coal consumption index value B g And an average coal consumption index value B dz And (5) monitoring. The method has the beneficial effects that the real-time coal consumption index value B is obtained by calculating the deviation of each parameter and the optimal value g And an average coal consumption index value B dz And the real-time display is provided for operators to refer to so as to make adjustment in time, on one hand, the economical efficiency of the coal consumption of the power plant is improved, and on the other hand, the coal consumption monitoring system of the power plant provided by the invention has the advantages of simple structure, easiness in popularization and strong practicability.
Comprising the step S8: firstly, calculating the boiler side coal consumption M of the ith boiler in the T time gli The calculation formula is as follows:
wherein B is gli The deviation index of the coal consumption of the boiler side of the ith boiler is taken as the index of the coal consumption deviation of the boiler side of the ith boiler;
then, calculating the coal consumption M of the steam turbine side of the jth steam turbine in the T time qjj The calculation formula is as follows:
wherein B is qjj The deviation index of the coal consumption at the steam turbine side of the jth steam turbine is obtained;
then, the power supply coal consumption M gd The calculation formula of (a) is as follows:
M gd ＝[B js +(M gl1 +M gl2 +…+M gli )/i+(M qj1 +M qj2 +…+M qjj )/j]/(1-L cy ) (18)
wherein, B js Is the base number of coal consumption for power generation;
then, the heat supply coal consumption M gr The calculation formula of (a) is as follows:
M gr ＝B js +(M gl1 +M gl2 +…+M gli )/i (19)
then the total coal consumption M z The calculation formula of (c) is:
M z ＝M gd +M gr (20)
finally, the real-time coal consumption index value B is calculated g Average coal consumption index value B dz And total coal consumption M z One or more of the monitoring. The beneficial effect is that the total coal consumption M is added z The monitoring of (2) can make the staff to the more comprehensive understanding of coal consumption, simultaneously, increase the accuracy of whole plant economic nature analysis.
The boiler side coal consumption deviation index B gl Including but not limited to load coal consumption bias B fh Main steam temperature coal consumption deviation B qw Oxygen content and coal consumption deviation B yl Deviation from exhaust gas temperature coal consumption B py One or more of the above. The method has the advantages that the method has great influence on the coal consumption economy of the power plant unit and can better reflect the coal consumption deviation index B on the boiler side gl 。
The load coal consumption deviation B fh The calculation formula of (2) is as follows:
B fh ＝(W ed -W sf )·A fh (2)
wherein, W ed For rated power of the generator，A fh Influencing the coal consumption coefficient for the load;
the main steam temperature coal consumption deviation B qw The calculation formula of (c) is:
B qw ＝(T zqe -T zq )·A zq ·C fh (3)
wherein, T zqe For the optimum temperature value of the main steam, A zq The temperature of the main steam influences the coal consumption coefficient;
the oxygen content and coal consumption deviation B yl The calculation formula of (c) is:
B yl ＝|O yl -O yle |·A yl (4)
wherein, O yle For an optimum intermediate value of oxygen amount, A yl The oxygen quantity influences the coal consumption coefficient;
the exhaust gas temperature coal consumption deviation B py The calculation formula of (c) is:
B py ＝(T py -T pye )·A py ·C fh (5)
wherein, T pye For the optimum value of the exhaust gas temperature, A py The coal consumption coefficient is influenced by the temperature of the exhaust gas. The method has the beneficial effect that after the influence coal consumption coefficient is added, the calculation of the coal consumption deviation is more accurate.
The load influences the coal consumption coefficient A fh The main steam temperature influences the coal consumption coefficient A zq The oxygen amount influences the coal consumption coefficient A yl And the exhaust gas temperature influences the coal consumption coefficient A py The value range of (A) is 0.5-1.
The side coal consumption deviation index B of the steam turbine qj Including but not limited to main steam pressure coal consumption deviation B qy Vacuum coal consumption deviation B zk Heat supply pressure coal consumption deviation B gr Deviation value B of coal consumption from feedwater temperature gs One or more of the above. The method has the advantages that the method has great influence on the economical efficiency of coal consumption of the power plant unit and can better reflect the coal consumption deviation index B on the steam turbine side qj 。
The main steam pressure coal consumption deviation B qy The calculation formula of (2) is as follows:
B qy ＝(P qye -P qy )·A qy ·C fh (7)
wherein, P qye For rated main steam pressure, A qy The main steam pressure coal consumption influence coefficient;
the vacuum coal consumption deviation B zk The calculation formula of (c) is:
B zk ＝(P zke -P zk )·A zk (8)
wherein, P zke Is the optimum vacuum degree of the condenser on the steam turbine side, A zk Influencing the coal consumption coefficient for vacuum;
the heat supply pressure coal consumption deviation B gr The calculation formula of (2) is as follows:
B gr ＝(P gre -P gr )·A gr (9)
wherein, P gre For optimum heating pressure, A gr Influencing the coal consumption coefficient for the heating pressure;
the feed water temperature coal consumption deviation value B gs The calculation formula of (c) is:
B gs ＝(T gse -T gs )·A gs (10)
wherein, T gse For optimum feed water temperature, A gs The coal consumption coefficient is influenced by the feed water temperature. The method has the beneficial effects that after the coal consumption coefficient is influenced, the calculation of the coal consumption deviation is more accurate.
Main steam pressure coal consumption influence coefficient A qy The vacuum influences the coal consumption coefficient A zk The heat supply pressure influences the coal consumption coefficient A gr And the feed water temperature influences the coal consumption coefficient A gs The value range of (A) is 0-0.5.
A power plant coal consumption monitoring system comprises an instantaneous power supply and heat supply total coal consumption monitoring module for monitoring a real-time coal consumption index value, an average power supply and heat supply total coal consumption monitoring module for monitoring an average coal consumption index value, and a display module for displaying any one or more of real-time coal consumption deviation and information of real-time coal consumption index value, average coal consumption index value and total coal consumption, wherein the instantaneous power supply and heat supply total coal consumption monitoring module is connected with a plurality of detectors through signals, the detectors are arranged in a thermal power generator set, the average power supply and heat supply total coal consumption monitoring module is connected with the instantaneous power supply and heat supply total coal consumption monitoring module through signals, and the display module is connected with the average power supply and heat supply total coal consumption monitoring module and the instantaneous power supply and heat supply total coal consumption monitoring module through signals. The monitoring system has the advantages of simple structure, easy popularization, strong practicability and capability of timely and accurately displaying various indexes.
Compared with the prior art, the invention has the beneficial effects that:
the method selects parameters with great influence on the economical efficiency of the coal consumption of the power plant unit such as load coal consumption, main steam temperature, oxygen amount, vacuum degree and the like, and obtains a real-time coal consumption index value B by calculating the deviation of each parameter and an optimal value g And an average coal consumption index value B dz And the real-time display is provided for operators to refer to so as to make adjustment in time, on one hand, the economical efficiency of the coal consumption of the power plant is improved, and on the other hand, the coal consumption monitoring system of the power plant provided by the invention has the advantages of simple structure, easiness in popularization and strong practicability. The labor cost is reduced, the on-site maintenance frequency is reduced or avoided, the maintenance cost and the fault processing time are saved, and the safe and reliable operation optimization management control of the thermal generator set is realized.
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In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a power plant coal consumption monitoring system according to a fourth embodiment of the present invention.
Reference numerals are as follows:
1-instantaneous power supply and heat supply total coal consumption monitoring module, 2-average power supply and heat supply total coal consumption monitoring module, 3-display module and 4-thermal generator set.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment discloses a power plant coal consumption monitoring method, which comprises the following steps:
s1, monitoring real-time load C of generator in real time sj And calculating a load correction coefficient C fh 。
Specifically, the load correction coefficient C is fh The calculation formula of (2) is as follows:
C fh ＝1+(C hd -C sj ) (1)
wherein, C hd Setting a load, namely the design load of the generator; c sj Is the actual load, i.e. the real-time load of the generator.
S2, real-time monitoring of actual power W of generator sf Main steam temperature T zq Oxygen amount O yl And temperature T of exhaust gas py One or more of them, combined with a load correction factor C fh Calculating the deviation values of the coal consumption and the standard values, and summing to obtain a boiler side coal consumption deviation index B gl 。
Specifically, the boiler-side coal consumption deviation index B gl Including but not limited to load coal consumption bias B fh Main steam temperature coal consumption deviation B qw Oxygen and coal consumption deviation B yl Deviation from exhaust gas temperature coal consumption B py One or more of the above.
The load coal consumption deviation B fh The calculation formula of (2) is as follows:
B fh ＝(W ed -W sf )·A fh (2)
wherein, W ed For rated power of the generator, A fh The coal consumption coefficient is influenced for the load. In experiments, the larger the load and the current of the generator are, the more the electric power of the generator is usedLarge load influence coal consumption coefficient A fh The values of (c) need to be determined from different power plants, boilers, turbines and generators. Preferably, the load influences the coal consumption coefficient A fh The value range of (A) is 0.5-1.
The deviation B of the main steam temperature coal consumption qw The calculation formula of (2) is as follows:
B qw ＝(T zqe -T zq )·A zq ·C fh (3)
wherein, T zqe For the optimum temperature value of the main steam, A zq The temperature of the main steam influences the coal consumption coefficient. The main steam temperature is also called main steam temperature, and is generally related to factors such as the ash deposition degree of a superheater, the water supply temperature, the excess air combustion coefficient and the like. In experiments, the temperature of the main steam is reduced by 10 ℃ to cause the coal consumption of the generator to rise by about 0.35%, and the temperature of the main steam influences the coal consumption coefficient A zq Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the temperature of the main steam influences the coal consumption coefficient A zq The value range of (A) is 0.5-1.
The above-mentioned oxygen content and coal consumption deviation B yl The calculation formula of (c) is:
B yl ＝|O yl -O yle |·A yl (4)
wherein, O yle Is the average value of the maximum value of the optimal oxygen quantity and the minimum value of the optimal oxygen quantity, namely the intermediate value of the optimal oxygen quantity, A yl The oxygen amount affects the coal consumption coefficient. The thermal generator set measures the oxygen content of the boiler flue gas and is used for judging whether the combustion is sufficient or not, the oxygen content is too low, and possibly the air supply quantity is too low, so that the combustion is insufficient, and the coal combustion quantity increases the load without correspondingly increasing; the oxygen content is too high, and may be too large air volume due to too much air supply, which causes too much smoke to take away heat, and causes heat loss. The oxygen content influences the coal consumption coefficient A yl Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the amount of oxygen affects the coal consumption coefficient A yl The value range of (A) is 0.5-1.
The deviation B of the exhaust gas temperature and coal consumption py The calculation formula of (2) is as follows:
B py ＝(T py -T pye )·A py ·C fh (5)
wherein, T pye For optimum value of exhaust gas temperature, A py The coal consumption coefficient is influenced by the temperature of the exhaust gas. The rise of the exhaust gas temperature is generally related to factors such as ash accumulation on a heated surface, large excess air coefficient of combustion, afterburning of a tail flue and the like. In experiments, the temperature of the exhaust gas is found to rise by 10 ℃ to cause the coal consumption to rise by about 0.5 percent. Coefficient of coal consumption A influenced by exhaust gas temperature py Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the exhaust gas temperature influences the coal consumption coefficient A py The value range of (a) is 0.5 to 1.
Then, the deviation index B of coal consumption on the boiler side gl Deviation of coal consumption for load B fh Main steam temperature coal consumption deviation B qw Oxygen content and coal consumption deviation B yl Deviation from exhaust gas temperature coal consumption B py The sum is the sum of the formulas (2), (3), (4) and (5). When there are other parameters, they are added to the calculation. The calculation formula is as follows:
B gl ＝B fh +B qw +B yl +B py (6)
in the equation (6), if the load coal consumption deviation B fh Main steam temperature coal consumption deviation B qw Oxygen and coal consumption deviation B yl Deviation from exhaust gas temperature coal consumption B py If one or more of them is not added to the calculation, its value is 0.
S3, monitoring the main steam pressure P in real time qy Vacuum degree P of condenser on side of steam turbine zk Pressure of heat supply P gr And the temperature T of feed water gs One or more of them, combined with a load correction factor C fh Calculating the deviation values of the coal consumption and the standard values, summing to obtain a coal consumption deviation index B of the steam turbine side qj 。
Specifically, the steam turbine-side coal consumption deviation index B qj Including but not limited to main steam pressure coal consumption deviation B qy Vacuum coal consumption deviation B zk Heat supply pressure coal consumption deviation B gr Deviation value B of coal consumption from feedwater temperature gs One or more of the above.
The main steam pressure coal consumption deviation B qy The calculation formula of (c) is:
B qy ＝(P qye -P qy )·A qy ·C fh (7)
wherein, P qye For rated main steam pressure, A qy Is the main steam pressure coal consumption influence coefficient. In experiments, the main steam pressure is increased by 1.0MPa, which results in about 0.5% increase of coal consumption. Main steam pressure coal consumption influence coefficient A qy Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the main steam pressure coal consumption influence coefficient A qy The value range of (a) is 0 to 0.5.
The above-mentioned vacuum coal consumption deviation B zk The calculation formula of (c) is:
B zk ＝(P zke -P zk )·A zk (8)
wherein, P zke Is the optimum vacuum degree of the condenser on the steam turbine side, A zk Influencing the coal consumption coefficient for vacuum. The reasons for the reduction of the vacuum degree mainly relate to the heat transfer coefficient of the condenser, the heat load of the condenser, the flow rate of cooling water and the temperature. In experiments, it was found that a vacuum drop of 1kPa results in an increase in coal consumption of around 0.75%. Coefficient of coal consumption influenced by vacuum zk Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the vacuum influences the coal consumption coefficient A zk The value range of (a) is 0 to 0.5.
The deviation B of coal consumption of the heat supply pressure gr The calculation formula of (2) is as follows:
B gr ＝(P gre -P gr )·A gr (9)
wherein, P gre For optimum heating pressure, A gr The coal consumption coefficient is influenced by the heat supply pressure. Vacuum influence coal consumption coefficient A zk Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the vacuum influences the coal consumption coefficient A zk The value range of (a) is 0 to 0.5.
The deviation value B of coal consumption of the feed water temperature gs The calculation formula of (c) is:
B gs ＝(T gse -T gs )·A gs (10)
wherein, T gse For optimum feed water temperature, A gs The coal consumption coefficient is influenced by the temperature of the feed water. The change of the temperature of the feed water causes the change of the quantity of the regenerative extraction steam to influence the work capacity on the one hand, and causes the change of the temperature of the exhaust smoke of the boiler to influence the efficiency of the boiler on the other hand. In experiments it was found that a 10 ℃ drop in feedwater temperature would result in a 0.2% increase in coal consumption. Coefficient of coal consumption A influenced by feed water temperature gs Measurements need to be made from different power plants, boilers, turbines and generators. Preferably, the feed water temperature influences the coal consumption coefficient A gs The value range of (A) is 0-0.5.
Then, the deviation index B of coal consumption on the steam turbine side qj Deviation of coal consumption under main steam pressure B qy Vacuum coal consumption deviation B zk Coal consumption deviation B of heat supply pressure gr Deviation value B of coal consumption from feedwater temperature gs The sum of the equations (7), (8), (9) and (10). When there are other parameters, they are added to the calculation. The calculation formula is as follows:
B qj ＝B qy +B zk +B gr +B gs (11)
in the formula (11), if the main steam pressure coal consumption deviation B qy Vacuum coal consumption deviation B zk Heat supply pressure coal consumption deviation B gr Deviation value B of coal consumption of feed water temperature gs If one or more of them is not added to the calculation, the value is 0.
S4, calculating the real-time coal consumption deviation and B f I.e. boiler side coal consumption deviation index B gl Deviation index B of coal consumption of steam turbine side qj And (4) the sum.
Specifically, the above-mentioned real-time coal consumption deviation and B f For the sum of equations (6) and (11), the calculation is as follows:
B f ＝B gl +B qj (12)
s5, calculating the comprehensive plant power rate L cy The calculation formula is as follows:
L cy ＝(Q f +Q wj +Q kj )/W sf (13)
wherein Q f According to the gatewayReal-time updated weekly reference non-production power usage, Q wj For not counting the power consumption of production, Q kj The method is a statistical production electricity which is calculated according to the current of the high-low voltage motor displayed by the existing current. In the experiment, the coal consumption is increased by about 1% when the comprehensive plant power rate is increased by 1%, and the equipment is stopped in time under a reasonable working condition during operation so as to reduce the consumption of plant power.
S6, calculating a real-time coal consumption index value B according to the formulas (12) and (13) g The calculation formula is as follows:
B g ＝B f /(1-L cy ) (14)。
s7, calculating an average coal consumption index value B in the T time according to the formula (14) dz The calculation formula is as follows:
and S8, calculating the total coal consumption in the power plant time T according to the formulas (6), (11) and (13).
Specifically, total coal consumption M z For supplying power with coal M gd And heat supply coal consumption M gr And (4) the sum.
Firstly, calculating the boiler side coal consumption M of the ith boiler in the T time gli The calculation formula is as follows:
wherein B is gli The deviation index of the coal consumption of the boiler side of the ith boiler is taken as the index of the coal consumption deviation of the boiler side of the ith boiler;
then, calculating the coal consumption M of the steam turbine side of the jth steam turbine in the T time qjj The calculation formula is as follows:
wherein B is qjj The deviation index of coal consumption at the steam turbine side of the jth steam turbine is obtained;
then the user can use the device to make a visual display,power supply coal consumption M gd The calculation formula of (c) is as follows:
M gd ＝[B js +(M gl1 +M gl2 +…+M gli )/i+(M qj1 +M qj2 +…+M qjj )/j]/(1-L cy ) (18)
wherein, B js Is a base number of coal consumption for power generation and a base number of coal consumption for power generation B js Setting according to a technical and economic index calculation method of a thermal power plant, power plant operation parameters, a boiler design specification, a steam turbine manufacturer specification and a generator specification;
then, heat supply coal consumption M gr The calculation formula of (a) is as follows:
M gr ＝B js +(M gl1 +M gl2 +…+M gli )/i (19)
then the total coal consumption M z The calculation formula of (c) is:
M z ＝M gd +M gr (20)
s9, monitoring real-time coal consumption deviation and B f Real-time coal consumption index value B g Average coal consumption index value B dz And total coal consumption M z Any one or more of them.
Example two:
the embodiment discloses a method for monitoring coal consumption of a power plant, which is different from the first embodiment only in that: the power of the generator set is 12MW-15MW; base number of coal consumption for power generation B js =450g/kwh; rated power W of generator ed 15.5g/kwh; optimal temperature value T of main steam zqe 449 deg.C; optimum oxygen amount intermediate value O yle 3.5 percent; optimum vacuum degree P zke At 96kPa; rated main steam pressure P qye Is 5.2MPa; optimum value T of exhaust gas temperature pye Is 110 ℃; optimum feedwater temperature T gse The temperature was 160 ℃. The parameters can be obtained by referring to a DL/T904-2004 thermal power plant technical economic index calculation method, power plant operation parameters, boiler design specifications, steam turbine manufacturer specifications and generator specifications.
Example three:
the embodiment discloses a method for monitoring coal consumption of a power plant, and the method and the embodimentThe only difference is that: the power of the generator set is 25MW-35MW; base number of coal consumption for power generation B js =360g/kwh; rated power W of generator ed 33.5g/kwh; optimal temperature value T of main steam zqe At 544 ℃; optimum oxygen intermediate value O yle 2.5 percent; optimum vacuum degree P zke At 96kPa; rated main steam pressure P qye Is 13.3MPa; optimum value T of exhaust gas temperature pye Is 110 ℃; optimum feedwater temperature T gse The temperature was 230 ℃. The above parameters can be obtained by referring to the technical and economic index calculation method of the DL/T904-2004 thermal power plant, the operation parameters of the plant, the design specifications of the boiler, the specifications of the manufacturer of the steam turbine and the specifications of the generator.
Example four:
referring to fig. 1, the embodiment discloses a power plant coal consumption monitoring system, which includes an instantaneous power supply and heat supply total coal consumption monitoring module 1 for monitoring a real-time coal consumption index value, an average power supply and heat supply total coal consumption monitoring module 2 for monitoring an average coal consumption index value, and a display module 3 for displaying any one or more of a real-time coal consumption deviation sum, a real-time coal consumption index value, an average coal consumption index value and total coal consumption. The instantaneous power supply and heat supply total coal consumption monitoring module 1 is connected with a plurality of detectors through signals. The detector is arranged in the thermal generator set 1. The average power supply and heat supply total coal consumption monitoring module 2 is in signal connection with the instantaneous power supply and heat supply total coal consumption monitoring module 1. The display module 3 is in signal connection with the average power supply and heat supply total coal consumption monitoring module 2 and the instantaneous power supply and heat supply total coal consumption monitoring module 1. Through the optimized design, the average power supply and heat supply total coal consumption monitoring module 2 and the instantaneous power supply and heat supply total coal consumption monitoring module 1 can obtain accurate real-time coal consumption deviation sum, real-time coal consumption index value, average coal consumption index value and total coal consumption information, and the display module 3 can display the information for the reference of workers, so that the workers can make adjustment in time, the power generation cost is reduced, and the power generation efficiency is improved.
The above-mentioned detailed description of the method and the device for monitoring the coal consumption of the power plant provided by the present invention is provided, and the structure and the working principle of the present invention are explained by applying specific examples, and the description of the above-mentioned embodiments is only used to help understanding the method and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for monitoring coal consumption of a power plant is characterized by comprising the following steps:
s1, monitoring real-time load C of generator in real time sj And calculating the deviation value of the load correction coefficient C from the standard value thereof to obtain a load correction coefficient C fh ；
S2, real-time monitoring of actual power W of generator sf Main steam temperature T zq Oxygen amount O yl And the temperature T of exhaust gas py One or more of them, combined with a load correction factor C fh Calculating the deviation values of the coal consumption and the standard values, and summing to obtain a boiler side coal consumption deviation index B gl ；
S3, monitoring the main steam pressure P in real time qy Vacuum degree P of condenser on side of steam turbine zk Heating pressure P gr And the feed water temperature T gs One or more of them, combined with a load correction factor C fh Calculating the deviation values of the coal consumption and the standard values, summing to obtain a coal consumption deviation index B of the steam turbine side qj ；
S4, calculating a coal consumption deviation index B on the boiler side gl Deviation index B of coal consumption on steam turbine side qj And the real-time coal consumption deviation and B are obtained f ；
S5, calculating the comprehensive plant power consumption L cy The calculation formula is as follows:
L cy ＝(Q f +Q wj +Q kj )/W sf (13)
wherein Q is f Non-productive electricity consumption per week basis, Q, updated in real time according to gateway meters wj For not counting the power consumption, Q kj The statistical production electricity is calculated according to the current of the high-low voltage motor displayed by the existing current;
s6, calculated according to the steps S4 and S5Obtaining the real-time coal consumption index value B g The calculation formula is as follows:
B g ＝B f /(1-L cy ) (14)
and for real-time coal consumption index value B g And (5) monitoring.
2. The power plant coal consumption monitoring method according to claim 1, comprising step S7:
calculating the average coal consumption index value B in the T time dz The calculation formula is as follows:
and the average coal consumption index value B dz And (5) monitoring.
3. The power plant coal consumption monitoring method according to claim 2, characterized by comprising the step S8:
calculating the boiler side coal consumption M of the ith boiler in the T time gli The calculation formula is as follows:
wherein B is gli The deviation index of the coal consumption of the boiler side of the ith boiler is taken as the index of the coal consumption deviation of the boiler side of the ith boiler;
calculating the coal consumption M of the steam turbine side of the jth steam turbine in the T time qjj The calculation formula is as follows:
wherein B is qjj The deviation index of the coal consumption at the steam turbine side of the jth steam turbine is obtained;
then, the power supply coal consumption M gd The calculation formula of (c) is as follows:
M gd ＝[B js +(M gl1 +M gl2 +…+M gli )/i+(M qj1 +M qj2 +…+M qjj )/j]/(1-L cy ) (18)
wherein, B js The base number of coal consumption for power generation;
then, the heat supply coal consumption M gr The calculation formula of (a) is as follows:
M gr ＝B js +(M gl1 +M gl2 +…+M gli )/i (19)
then the total coal consumption M z The calculation formula of (2) is as follows:
M z ＝M gd +M gr (20)
and for real-time coal consumption index value B g Average coal consumption index value B dz And total coal consumption M z One or more of the monitoring.
4. The power plant coal consumption monitoring method of claim 1, wherein the boiler side coal consumption deviation index B gl Including load coal consumption deviation B fh Main steam temperature coal consumption deviation B qw Oxygen content and coal consumption deviation B yl Deviation from exhaust gas temperature coal consumption B py One or more of them.
5. A power plant coal consumption monitoring method according to claim 4, characterized in that the load coal consumption deviation B fh The calculation formula of (2) is as follows:
B fh ＝(W ed -W sf )·A fh (2)
wherein, W ed For rated power of the generator, A fh Influencing the coal consumption coefficient for the load;
the main steam temperature coal consumption deviation B qw The calculation formula of (c) is:
B qw ＝(T zqe -T zq )·A zq ·C fh (3)
wherein, T zqe For the optimum temperature value of the main steam, A zq The temperature of the main steam influences the coal consumption coefficient;
the oxygen content and coal consumption deviation B yl The calculation formula of (2) is as follows:
B yl ＝|O yl -O yle |·A yl (4)
wherein, O yle For an optimum intermediate value of oxygen amount, A yl The oxygen quantity influences the coal consumption coefficient;
the exhaust gas temperature coal consumption deviation B py The calculation formula of (2) is as follows:
B py ＝(T py -T pye )·A py ·C fh (5)
wherein, T pye For optimum value of exhaust gas temperature, A py The coal consumption coefficient is influenced by the exhaust gas temperature.
6. A power plant coal consumption monitoring method according to claim 5, characterized in that the load affects the coal consumption coefficient A fh The main steam temperature influences the coal consumption coefficient A zq The oxygen amount influences the coal consumption coefficient A yl And the exhaust gas temperature influences the coal consumption coefficient A py The value range of (a) is 0.5 to 1.
7. A power plant coal consumption monitoring method according to claim 1, characterized in that the steam turbine side coal consumption deviation index B qj Comprises main steam pressure coal consumption deviation B qy Vacuum coal consumption deviation B zk Coal consumption deviation B of heat supply pressure gr Deviation value B of coal consumption of feed water temperature gs One or more of them.
8. The power plant coal consumption monitoring method according to claim 7, wherein the main steam pressure coal consumption deviation B qy The calculation formula of (c) is:
B qy ＝(P qye -P qy )·A qy ·C fh (7)
wherein, P qye For rated main steam pressure, A qy The main steam pressure coal consumption influence coefficient;
the vacuum coal consumption deviation B zk The calculation formula of (2) is as follows:
B zk ＝(P zke -P zk )·A zk (8)
wherein, P zke Is the optimum vacuum degree of the condenser on the steam turbine side, A zk Influencing the coal consumption coefficient for vacuum;
the heat supply pressure coal consumption deviation B gr The calculation formula of (c) is:
B gr ＝(P gre -P gr )·A gr (9)
wherein, P gre For optimum heating pressure, A gr Influencing the coal consumption coefficient for the heating pressure;
the feed water temperature coal consumption deviation value B gs The calculation formula of (c) is:
B gs ＝(T gse -T gs )·A gs (10)
wherein, T gse For optimum feed water temperature, A gs The coal consumption coefficient is influenced by the temperature of the feed water.
9. The power plant coal consumption monitoring method of claim 8, wherein the main steam pressure coal consumption influence coefficient A qy The vacuum influences the coal consumption coefficient A zk The heat supply pressure influences the coal consumption coefficient A gr And the feed water temperature influences the coal consumption coefficient A gs The value range of (A) is 0-0.5.
10. The power plant coal consumption monitoring system is characterized by comprising an instantaneous power supply and heat supply total coal consumption monitoring module (1) for monitoring a real-time coal consumption index value, an average power supply and heat supply total coal consumption monitoring module (2) for monitoring an average coal consumption index value and a display module (3) for displaying any one or more of a real-time coal consumption deviation, a real-time coal consumption index value, an average coal consumption index value and total coal consumption, wherein the instantaneous power supply and heat supply total coal consumption monitoring module (1) is connected with a plurality of detectors through signals, the detectors are arranged in a thermal power generating set (1), the average power supply and heat supply total coal consumption monitoring module (2) is in signal connection with the instantaneous power supply and heat supply total coal consumption monitoring module (1), and the display module (3) is in signal connection with the average power supply total coal consumption monitoring module (2) and the instantaneous power supply total coal consumption monitoring module (1).
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