CN113654075B - Method and device for predicting lignite blending combustion proportion of coal-fired boiler - Google Patents
Method and device for predicting lignite blending combustion proportion of coal-fired boiler Download PDFInfo
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- 239000003077 lignite Substances 0.000 title claims abstract description 149
- 238000002156 mixing Methods 0.000 title claims abstract description 131
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 110
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
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Abstract
The invention provides a method for predicting the lignite blending combustion proportion of a coal-fired boiler, which comprises the following steps: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule; and (B) step (B): under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills; step C: the sum of the products of the operating time duty ratio at each load interval and the blend ratio at that load interval is taken as = lignite maximum blend ratio. The invention has the advantages that: the operation condition of the boiler in the next period is estimated through the historical data, the operation model of the boiler is simplified, the blending proportion is determined directly by the number of coal mills applicable to lignite and non-lignite, so that calculation is convenient, the maximum blending proportion meeting the operation requirement is calculated through the historical data, guidance is provided for purchasing and using lignite, and the economy of operation of a power plant is improved.
Description
Technical Field
The invention relates to the technical field of coal-fired power generation, in particular to a method and a device for predicting lignite blending combustion proportion of a coal-fired boiler.
Background
In recent years, along with the influence of market environment, coal yield, power production and other factors, the cost of fire coal in a thermal power plant rises year by year, and blending and burning of coal is an effective way for reducing the power generation cost in the thermal power plant. The thermal power plant needs to dynamically and flexibly adjust the coal purchasing strategy according to the coal market and properly blend non-designed economic coal types. The unit price of the lignite is low, the lignite is suitable for being used as a blended coal, but the lignite has lower heat value and larger heat value deviation, and a reasonable fuel purchasing plan is required to be made on the premise of ensuring the load carrying capacity of a unit, so that the running economy of a power plant is improved. Therefore, prediction calculation is required to be carried out on the blending ratio of the lignite, and the optimal economical efficiency is ensured.
The existing calculation method only estimates the data of the coming year by the statistic value of the brown coal blending amount of the previous year, and no scientific system calculation method exists. And the lignite with different heat values cannot be effectively distinguished, so that the heat values of the lignite cannot be predicted on the premise of ensuring the loading capacity and the optimal economical efficiency of the unit.
The invention patent with publication number of CN105135459A discloses a method for calculating the lignite blending and burning capacity of a coal mill, which is implemented by obtaining the maximum blending and burning amount of the coal mill in different states and taking the minimum maximum blending and burning amount as the maximum blending and burning amount. The method is simple in calculation mode, only the operation working condition of a single coal mill is considered, and future blending combustion proportion cannot be predicted from the angle of a thermal power plant.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lignite blending proportion prediction method so as to obtain blending proportion required by ensuring loading capacity and optimal economy of a unit.
The invention solves the technical problems through the following technical scheme: a method for predicting the lignite blending combustion proportion of a coal-fired boiler comprises the following steps of
Step A: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule;
and (B) step (B): under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills;
step C: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period.
According to the invention, the operation condition of the boiler in the next period is estimated through the historical data, the operation model of the boiler is simplified, and the blending ratio is directly determined by the number of coal mills applicable to lignite and non-lignite, so that the calculation is convenient, the maximum blending ratio meeting the operation requirement is calculated through the historical data, guidance is provided for purchasing and using lignite, and the economical efficiency of power plant operation is improved.
Preferably, the method further comprises the step of correcting the maximum blending ratio calculated in the step C,
step D: calculating the lower limit of the lignite heat value when the blending combustion proportion in the step B is met under different load intervals, and taking the maximum value of the calculated lower limit of the lignite heat value under different load intervals as the maximum lower limit of the lignite heat value;
step E: outputting the maximum blending combustion proportion of the lignite in the step C if the actual calorific value of the lignite is larger than the maximum lower limit of the calorific value; otherwise, turning to the step F;
step F: and C, increasing the number of the non-lignite coal mills used in each load interval in the step B by 1, recalculating the blending ratio in different load intervals, and repeating the steps C-E.
Preferably, the boiler load is divided into four load sections of 40% -50% THA, 50% -65% THA, 65% -85% THA and 85% -100% THA; the running time ratio of each load section as the next running period was a, b, c, d based on the average value of the history data of at least 1 running period before.
Preferably, the number of coal mills participating in operation in each load zone is m n N=1, 2,3,4, the blending ratio in the different load regions in step B is respectivelyThe maximum blending ratio in the step C is
Preferably, the calculation method of the lower limit of the calorific value of the lignite in the step D is as follows:
the calculation formula of the power generation coal consumption is
Combining the above three formulas, calculating to obtain
Wherein b f g/(kW.h) is the power generation coal consumption; b (B) b The coal consumption in the statistical period is t; w (W) f The generated energy is kW.h; η (eta) gd Is pipeline efficiency; η (eta) g Is the thermal efficiency of the boiler; q is the heat rate, kJ/(kW.h); r is R h 4.1868kJ/kcal is taken as the thermal equivalent value; 7000 is the calorific value of standard coal, kcal/kg;q is the calorific value of the fire coal, kJ/kg;
let Q to Q net ,B b →m,W f E, obtain
Wherein Q is net The heat value of the coal is m, the total coal consumption in unit time is m, and E is the total power generation in unit time;
according to the formula, calculating the lower limit of the heat value of the coal under different load intervals; the lower limit of the heat value of the fire coal is the maximum heat value when the heat rate in the load interval is maximum and the heat efficiency of the boiler is lowest;
in the case where the heating value of the non-lignite is substantially unchanged, the following relationship is satisfied:
lower limit of coal heating value = non-lignite heating value + non-lignite ratio + lignite heating value + lignite ratio
Thus, the first and second substrates are bonded together,
lower limit of lignite heat value satisfying maximum blending ratio= (lower limit of coal heat value-non-lignite ratio)/lignite ratio
Based on the above formula, calculating the lower limit of the lignite heat value under different load intervals, and taking the maximum value as the maximum lower limit Q of the lignite heat value max 。
Preferably, an average value of overhaul records of the coal-fired boiler in at least one past operation period is used as an overhaul plan of the coal-fired boiler in the next operation period, when the coal-fired boiler is in an overhaul state, the number of the coal-fired boiler is reduced to one, the normal operation time is p days, the overhaul operation time is (365-p) days, the load interval and the corresponding operation time duty ratio are divided again, and the steps B-F are executed to obtain the maximum blending combustion proportion in the overhaul state.
Preferably, under the condition of considering overhaul of the coal-fired boiler, the comprehensive maximum blending combustion proportion of the next operation period is
Wherein eta is the comprehensive maximum blending ratio of lignite 1 For the maximum blending ratio of lignite under normal working condition, eta 2 The maximum blending ratio of the lignite under the overhaul state is obtained.
Preferably, the operating cycle is one year.
The invention also discloses a device for predicting the lignite blending combustion proportion of the coal-fired boiler, which comprises
Load interval dividing module: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule;
and a blend burning proportion determining module: under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills;
the calculation module: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period.
Preferably, the method further comprises the steps of,
theoretical calorific value calculation module: calculating the lower limit of the lignite heat value when the blending ratio determined by the blending ratio determining module is met under different load intervals, and taking the maximum value of the calculated lower limit of the lignite heat value under different load intervals as the maximum lower limit of the lignite heat value;
and a comparison module: outputting the maximum blending combustion proportion of the lignite if the actual calorific value of the lignite is greater than the maximum lower limit of the calorific value; otherwise, executing a blending burning mode updating module;
and a doping burning mode updating module: and increasing the number of the non-lignite coal mills used in each load interval corresponding to the current maximum blending ratio by 1, recalculating the blending ratio in different load intervals, and returning to the calculation module.
The method and the device for predicting the lignite blending combustion proportion of the coal-fired boiler have the advantages that: the operation condition of the boiler in the next period is estimated through the historical data, the operation model of the boiler is simplified, the blending proportion is determined directly by the number of coal mills applicable to lignite and non-lignite, so that calculation is convenient, the maximum blending proportion meeting the operation requirement is calculated through the historical data, guidance is provided for purchasing and using lignite, and the economy of operation of a power plant is improved. Meanwhile, whether the calculated maximum blending ratio meets the use requirement is determined based on the comparison of the lignite calorific value and the theoretical maximum lower limit, and the cross-over combustion ratio is optimized based on the comparison result so as to ensure the normal operation of the unit. In addition, the overhaul condition is further considered, and the maximum blending combustion proportion close to the real running condition is obtained.
Drawings
Fig. 1 is a flowchart of a method for predicting a lignite blending combustion ratio of a coal-fired boiler according to an embodiment of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in FIG. 1, the embodiment provides a method for predicting the lignite blending combustion ratio of a coal-fired boiler, which comprises
Step A: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule;
and (B) step (B): under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills;
step C: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period.
According to the embodiment, the operation working condition of the boiler in the next period is estimated through the historical data, the operation model of the boiler is simplified, the blending proportion is directly determined according to the number of coal mills applicable to lignite and non-lignite, so that calculation is convenient, the maximum blending proportion meeting the operation requirement is calculated through the historical data, and guidance is provided for purchasing and using lignite.
Further, the method also comprises the step of correcting the maximum blending ratio calculated in the step C,
step D: calculating the lower limit of the lignite heat value when the blending combustion proportion in the step B is met under different load intervals, and taking the maximum value of the calculated lower limit of the lignite heat value under different load intervals as the maximum lower limit of the lignite heat value;
step E: outputting the maximum blending combustion proportion of the lignite in the step C if the actual calorific value of the lignite is larger than the maximum lower limit of the calorific value; otherwise, turning to the step F;
step F: and C, increasing the number of the non-lignite coal mills used in each load interval in the step B by 1, recalculating the blending ratio in different load intervals, and repeating the steps C-E.
In the embodiment, whether the calculated maximum blending ratio meets the use requirement is determined based on the comparison of the lignite calorific value and the theoretical maximum lower limit, and the cross-over combustion ratio is optimized based on the comparison result so as to ensure the normal operation of the unit.
Taking a common single boiler provided with 6 coal mills as an example, a single operation period is one year, and the method for predicting the blending combustion proportion provided by the embodiment is described.
Step A: the unit load interval is divided, and the unit load is divided into four load intervals of 40-50% THA, 50-65% THA, 65-85% THA and 85-100% THA because the unit load is hardly lower than 40% THA (turbine heat acceptance, heat rate acceptance working condition) in the normal operation process of the unit, wherein the dividing basis is that the running number of coal mills under different load sections is used as a reference, namely, the four load intervals respectively correspond to 3-6 coal mills to run. The ratio of the total running time under different load intervals is a, b, c, d by referring to the average value of the previous 1-2 years; and the duty ratio of each load interval can be adjusted based on the prediction of the power consumption of the next year.
And (B) step (B): according to the purchase and operation experience of the coal, the lignite cannot be combusted by a single coal type due to the lower heat value, and the coal blending and the blending are needed. Therefore, under each load zone, the lignite is used by the rest coal mills on the basis that the common coal type is used by 1 coal mill without considering the condition that all coal mills are lignite, and the blending combustion mode is the maximum blending combustion proportion.
Step C: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period.
The following table shows the calculation result of the maximum blending ratio of lignite under the operation of 6 coal mills under ideal conditions, and the final maximum blending ratio is 0.66a+0.75b+0.80c+0.83d.
Because different lignite heat values are different, not all lignite heat values can meet the blending combustion proportion under ideal conditions. Because the maximum output of the coal mill is fixed, the lower limit of the calorific value of the lignite when the blending ratio is met under different load sections can be calculated reversely through the total coal quantity.
The calculation formula of the power generation coal consumption is as follows:
Q＝R h x 7000 where b f g/(kW.h) is the power generation coal consumption; b (B) b The coal consumption in the statistical period is t; w (W) f The generated energy is kW.h; η (eta) gd Is pipeline efficiency; η (eta) g Is the thermal efficiency of the boiler; q is the heat rate, kJ/(kW.h); r is R h 4.1868kJ/kcal is taken as the thermal equivalent value; 7000 is the calorific value of standard coal, kcal/kg; q is the calorific value of the fire coal, kJ/kg;
let Q to Q net ,B b →m,W f E, obtain
Wherein Q is net The heat value of the coal is m, the total coal consumption in unit time is m, and E is the total power generation in unit time;
according to the formula, calculating the lower limit of the heat value of the coal under different load intervals; the lower limit of the heat value of the fire coal is the maximum heat value when the heat rate in the load interval is maximum and the heat efficiency of the boiler is lowest;
the present embodiment calculates the pipeline efficiency η gd Taking the design value of a unit and the thermal efficiency eta of a boiler g And the heat consumption rate q, the coal consumption m in the statistical period and the generated energy E are determined according to thermal tests in different load intervals.
In the case where the heating value of the non-lignite is substantially unchanged, the following relationship is satisfied:
lower limit of coal heating value = non-lignite heating value + non-lignite ratio + lignite heating value + lignite ratio
Thus, the first and second substrates are bonded together,
lower limit of lignite heat value satisfying maximum blending ratio= (lower limit of coal heat value-non-lignite ratio)/lignite ratio
Based on the above formula, calculating the lower limit of the lignite heat value under different load intervals, and taking the maximum value as the maximum lower limit Q of the lignite heat value max 。
If the actual heating value of the purchased lignite is not less than Q max Under the current blending ratio, the output requirement of the coal mill can be met, the current calculated maximum blending ratio of 0.66a+0.75b+0.80c+0.83d is taken as the final result to be output, and if the actual calorific value of the purchased lignite is smaller than Q max Under the current blending ratio, the energy provided by the lignite can not meet the output requirement of the coal mill, at the moment, the number of the coal mills which use non-lignite under each working condition is increased by one, and the maximum blending ratio is calculated again according to the method, wherein the maximum blending ratio is shown in the following table:
the final calculated maximum blending ratio is 0.33a+0.50b+0.60c+0.66d, and then the maximum lower limit Q of the lignite calorific value under the blending ratio is recalculated max And comparing with the actual heat value, if the output requirement of the coal mill is not met, continuously increasing the number of the coal mills using the non-lignite until the actual heat value of the lignite is not less than Q max And outputting the corresponding maximum brown coal blending ratio.
Example 2
In the long-term operation process of the coal mill, maintenance is required to be arranged, the coal mill cannot operate during maintenance, the factors can influence the determination of the brown coal blending ratio, in the embodiment, the maintenance duration of the next year is predicted by referring to the maintenance records of the coal mill in the previous 1-2 years and the future maintenance plan, in the maintenance state, one coal mill cannot operate, other coal mills normally operate, the normal operating condition time of 6 coal mills is p days, and the maintenance operating condition duration of 5 coal mills is (365-p) days.
And the load of the unit is divided into three load sections of 40-50% THA, 50-75% THA and 75-1000% THA for the operation conditions of 5 coal mills, and the load sections respectively correspond to the operation conditions of 3-5 coal mills. The calculation process based on the maximum blending ratio of the 6 coal mills comprises the following calculation results:
for the maximum blending ratio, the maximum lower limit of the theoretical heat value of the lignite is calculated, and compared with the actual heat value, the number of coal mills which are not used for lignite is increased under the condition that the output requirement of the coal mills is not met, and the maximum blending ratio meeting the requirement is calculated.
After the calculation of the maximum blending ratio of 5 coal mills and 6 coal mills is completed respectively, the comprehensive maximum blending ratio of the whole year needs to be comprehensively determined, and the method comprises the following steps:
wherein eta is the comprehensive maximum blending ratio of lignite 1 For the maximum blending ratio of lignite under normal working condition, eta 2 The maximum blending ratio of the lignite under the overhaul state is obtained.
The embodiment also provides a device for predicting the lignite blending combustion proportion of the coal-fired boiler, which comprises
Load interval dividing module: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule;
and a blend burning proportion determining module: under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills;
the calculation module: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period.
Further, the method also comprises the steps of,
theoretical calorific value calculation module: calculating the lower limit of the lignite heat value when the blending ratio determined by the blending ratio determining module is met under different load intervals, and taking the maximum value of the calculated lower limit of the lignite heat value under different load intervals as the maximum lower limit of the lignite heat value;
and a comparison module: outputting the maximum blending combustion proportion of the lignite if the actual calorific value of the lignite is greater than the maximum lower limit of the calorific value; otherwise, executing a blending burning mode updating module;
and a doping burning mode updating module: and increasing the number of the non-lignite coal mills used in each load interval corresponding to the current maximum blending ratio by 1, recalculating the blending ratio in different load intervals, and returning to the calculation module.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for predicting the lignite blending combustion proportion of a coal-fired boiler is characterized by comprising the following steps: comprising
Step A: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule;
and (B) step (B): under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills;
step C: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period;
the method also comprises the step of correcting the maximum blending ratio calculated in the step C,
step D: calculating the lower limit of the lignite heat value when the blending combustion proportion in the step B is met under different load intervals, and taking the maximum value of the calculated lower limit of the lignite heat value under different load intervals as the maximum lower limit of the lignite heat value;
step E: outputting the maximum blending combustion proportion of the lignite in the step C if the actual calorific value of the lignite is larger than the maximum lower limit of the calorific value; otherwise, turning to the step F;
step F: increasing the number of non-lignite coal mills used in each load interval in the step B by 1, recalculating the blending ratio in different load intervals, and repeating the steps C-E;
the boiler load is divided into four load sections of 40% -50% THA, 50% -65% THA, 65% -85% THA and 85% -100% THA; based on the average value of the historical data of at least 1 operation period before, the operation time proportion of each load interval of the next operation period is a, b, c, d respectively;
the number of coal mills participating in operation under each load interval is m respectively n N=1, 2,3,4, the blending ratio in the different load regions in step B is respectivelyThe maximum blending ratio in the step C is
The calculation method of the lignite calorific value lower limit in the step D comprises the following steps:
the calculation formula of the power generation coal consumption is
Q＝R h ×7000
Combining the above three formulas, calculating to obtain
Wherein b f g/(kW.h) is the power generation coal consumption; b (B) b The coal consumption in the statistical period is t; w (W) f The generated energy is kW.h; η (eta) gd Is pipeline efficiency; η (eta) g Is the thermal efficiency of the boiler; q is the heat rate, kJ/(kW.h); r is R h 4.1868kJ/kcal is taken as the thermal equivalent value; 7000 is the calorific value of standard coal, kcal/kg; q is the calorific value of the fire coal, kJ/kg;
let Q to Q net ,B b →m,W f E, obtain
Wherein Q is net The heat value of the coal is m, the total coal consumption in unit time is m, and E is the total power generation in unit time;
according to the formula, calculating the lower limit of the heat value of the coal under different load intervals; the lower limit of the heat value of the fire coal is the maximum heat value when the heat rate in the load interval is maximum and the heat efficiency of the boiler is lowest;
in the case where the heating value of the non-lignite is substantially unchanged, the following relationship is satisfied:
lower limit of coal heating value = non-lignite heating value + non-lignite ratio + lignite heating value + lignite ratio
Thus, the first and second substrates are bonded together,
lower limit of lignite heat value satisfying maximum blending ratio= (lower limit of coal heat value-non-lignite ratio)/lignite ratio
Based on the above formula, calculating the lower limit of the lignite heat value under different load intervals, and taking the maximum value as the maximum lower limit Q of the lignite heat value max 。
2. The method for predicting the brown coal blending combustion ratio of the coal-fired boiler according to claim 1, which is characterized by comprising the following steps: taking an average value of overhaul records of the coal-fired boiler in at least one past operation period as an overhaul plan of the coal-fired boiler in the next operation period, simplifying the coal-fired boiler into one less total coal mill when the coal-fired boiler is in an overhaul state, wherein the normal operation time is p days, the overhaul operation time is (365-p) days, and the load interval and the corresponding operation time duty ratio are re-divided, so that the maximum blending combustion proportion in the overhaul state is obtained.
3. The method for predicting the brown coal blending combustion ratio of the coal-fired boiler according to claim 2, which is characterized in that: under the condition of considering overhaul of the coal-fired boiler, the comprehensive maximum blending combustion proportion of the next operation period is
Wherein eta is the comprehensive maximum blending ratio of lignite 1 For the maximum blending ratio of lignite under normal working condition, eta 2 The maximum blending ratio of the lignite under the overhaul state is obtained.
4. The method for predicting the brown coal blending combustion ratio of the coal-fired boiler according to claim 1, which is characterized by comprising the following steps: the operating cycle is one year.
5. A lignite blending combustion ratio prediction device based on the coal-fired boiler according to any one of claims 1 to 4, which is characterized in that: comprising
Load interval dividing module: dividing a boiler load zone according to the number of coal mills in a working state in the use of the boiler, and obtaining the operation time duty ratio of different load zones in the next operation period based on a historical operation rule;
and a blend burning proportion determining module: under each load interval, the blending ratio is obtained in a mode that one coal mill uses all lignite instead of the rest coal mills;
the calculation module: taking the sum of the products of the operating time duty ratio under each load interval and the blending ratio under the load interval as the maximum blending ratio of the lignite in the next operating period.
6. The device for predicting the lignite blending combustion ratio of the coal-fired boiler according to claim 5, wherein the device is characterized in that: also included is a method of manufacturing a semiconductor device,
theoretical calorific value calculation module: calculating the lower limit of the lignite heat value when the blending ratio determined by the blending ratio determining module is met under different load intervals, and taking the maximum value of the calculated lower limit of the lignite heat value under different load intervals as the maximum lower limit of the lignite heat value;
and a comparison module: outputting the maximum blending combustion proportion of the lignite if the actual calorific value of the lignite is greater than the maximum lower limit of the calorific value; otherwise, executing a blending burning mode updating module;
and a doping burning mode updating module: and increasing the number of the non-lignite coal mills used in each load interval corresponding to the current maximum blending ratio by 1, recalculating the blending ratio in different load intervals, and returning to the calculation module.
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