CN114576149B - Optimal operation control system and method for circulating water pump of thermal power plant - Google Patents
Optimal operation control system and method for circulating water pump of thermal power plant Download PDFInfo
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- CN114576149B CN114576149B CN202210108271.3A CN202210108271A CN114576149B CN 114576149 B CN114576149 B CN 114576149B CN 202210108271 A CN202210108271 A CN 202210108271A CN 114576149 B CN114576149 B CN 114576149B
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Abstract
The invention discloses a control system and a method for optimizing operation of a circulating water pump of a thermal power plant, wherein the control system comprises the following components: the historical data acquisition module is used for acquiring historical operation data of the unit; the steady-state working condition judging module is used for determining the steady-state working condition of the unit in steady operation in the historical data acquisition module; the economic evaluation module is used for evaluating the economic performance of the unit operation under different operation modes of the circulating water pump; and the optimal operation decision module is used for sending out an operation mode control instruction of the circulating water pump and carrying out self-learning updating. The invention solves the problem that the error is uncontrollable caused by the traditional method according to performance tests, design parameters, mathematical model calculation, correction and the like, and has high safety and low maintenance cost; in addition, the optimal operation instruction of the circulating water pump is self-updated through real-time operation data, so that the circulating water pump is always in an optimal operation mode which accords with the actual operation mode of the unit, the influence of aging and overhaul of the unit on the performance of the unit is overcome, and the energy-saving effect is remarkable.
Description
Technical Field
The invention relates to the technical field of optimal operation of a cold end of a pure condensing unit of a thermal power plant, in particular to an optimal operation control system and method of a circulating water pump of the thermal power plant.
Background
At present, cold end optimization operation research at home and abroad often adopts two modes. One is a numerical simulation and theoretical calculation method, such as simulating the heat transfer condition of a condenser and the parameter pressure, temperature and the like of a fluid flow field; flow field structure and aerodynamic performance inside the low-pressure exhaust system of the steam turbine, and detailed two-dimensional distribution of air flow velocity, enthalpy value, moisture content and water temperature inside the cooling tower. The numerical simulation result is often used for evaluating the design condition of equipment, and the guidance on the optimized operation of the cold end is relatively lacking; the other is to adopt the method of the performance test, seek the maximum difference between the output increase value of the unit and the power consumption of the circulating water pump, the method cost of the test is higher, in addition, can't carry on the test of all entry temperatures, adopt the method of correction to draw the operation curve in a large number, when the operation parameter deviates from the design value greatly, the error is uncontrollable.
Chinese patent CN107829924B discloses a control method and apparatus for the most energy-saving of a circulating water pump set based on big data, which maintains water pumps with different rated powers at different frequencies to operate simultaneously, and realizes the optimal energy consumption under the condition of meeting the total flow output. The patent mainly realizes energy conservation of the circulating water pump set, and does not consider the influence of different circulating water pump operation modes on the operation economy of the steam turbine.
Xu Cold end optimization of a turboset based on data mining is disclosed in China Motor engineering journal 2021, volume 41 (2 nd phase), 423-431, and the cold end optimization method of the turboset based on data mining is implemented by establishing a vacuum prediction model and comparing a predicted value with a residual error of a reference value, wherein the reference value is fixed, and the deterioration of the performance of the turboset along with the operation duration is not considered.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a circulating water pump optimal operation control system and a circulating water pump optimal operation control method for determining an optimal operation mode of a circulating water pump under each working condition based on historical operation big data and performing self-learning updating on the optimal operation mode according to real-time operation conditions of a unit.
The invention solves the problems by adopting the following technical scheme: an optimizing operation control system for a circulating water pump of a thermal power plant is characterized by comprising:
the historical data acquisition module is used for acquiring historical operation data of the unit;
the steady-state working condition judgment module is used for determining the steady-state working condition of the unit in the historical data acquisition module in steady operation based on a steady-state working condition judgment criterion;
the economic evaluation module is used for evaluating the economic performance of the running of the unit under the same working condition and different running modes of the circulating water pump under the steady-state working condition, recording the historical optimal running mode of the circulating water pump under each working condition in the module, and self-learning and updating the optimal running mode of the circulating water pump under each working condition according to the real-time running condition of the unit;
and the optimal operation decision module is used for evaluating whether the current operation mode of the circulating water pump is optimal or not according to the historical optimal operation mode of the circulating water pump and the load prediction curve under each working condition stored in the economy evaluation module and sending out a control instruction.
Further, the obtaining the historical operating data of the unit at least includes: unit load, operation mode of a circulating water pump, circulating water flow, circulating water inlet temperature, circulating water outlet temperature, circulating water pump power and steam turbine exhaust pressure;
the judgment criteria of the steady-state working condition are as follows: when the operation mode of the circulating water pump is the same within 30 minutes, and the fluctuation of 5 variables such as the unit load, the main steam pressure, the main steam temperature, the reheat steam temperature, the feedwater flow and the like is smaller than the allowable value, the operation working condition is indicated to be a steady-state working condition;
the same working condition means that the deviation of the unit load and the circulating water inlet temperature is smaller than an allowable value;
the economy of the unit operation means that the smaller the heat loss rate of the unit is, the better the operation economy is under the same working condition and different operation modes of the circulating water pump;
the optimal operation mode of the circulating water pump capable of self-learning and updating each working condition refers to the condition data stored in the economic evaluation module when the real-time operation working condition of the unit reaches the steady-state working condition requirement. When the historical operation working condition which is the same as the real-time operation working condition exists, if the operation mode of the circulating water pump is the same, updating the economic data under the operation mode in the economic evaluation module; if the running modes of the circulating water pump are different, comparing the economical efficiency of the real-time running working condition with that of the historical optimal running mode, if the economical efficiency of the real-time running working condition is better, storing the running mode of the circulating water pump in the real-time running working condition as the optimal running mode into an economical efficiency evaluation module and keeping the running mode to run, otherwise, adjusting the running mode of the circulating water pump to be the historical optimal running mode. When the historical operation working condition which is the same as the real-time operation working condition does not exist, the working condition data of the operation mode of the circulating water pump at the moment is stored into the economic evaluation module, and the operation mode is kept to operate.
The optimization operation method of the circulating water pump comprises the following steps:
s1, acquiring unit operation history data;
s2, according to the historical data, obtaining the running mode of the circulating water pump under each steady-state working condition;
s3, evaluating the economy of the unit under the same working condition and different operation modes of the circulating water pump, and recording the historical optimal operation mode of the circulating water pump under each working condition;
and S4, according to the real-time running condition of the unit, combining the historical optimal running mode of the circulating water pump and a load prediction curve, sending out a control instruction, and self-learning and updating the optimal running mode of the circulating water pump under each working condition.
Furthermore, the economy of unit operation means that the larger the difference value between the output increasing value of the unit and the power consumption increasing value of the circulating water pump is, the better the unit operation economy is under the same working condition and different running modes of the circulating water pump.
Compared with the prior art, the invention has the following advantages and effects: according to the invention, the optimal operation mode of the circulating water pump is determined according to the actual operation history data of the unit, the problem that errors are uncontrollable due to performance tests, design parameters, mathematical model calculation, correction and the like in the traditional method is solved, any transformation on equipment is not needed, the safety is high, and the maintenance cost is low. In addition, the invention also carries out self-updating on the optimal operation instruction of the circulating water pump through real-time operation data, thereby overcoming the influence of unit aging and overhaul on the performance of the circulating water pump, leading the circulating water pump to be always in an optimal operation mode which accords with the actual practice of the unit, and having remarkable energy-saving effect.
Drawings
FIG. 1 is a schematic diagram of a control system according to the present invention.
Fig. 2 is a correction chart of an embodiment of the present invention.
FIG. 3 is a flow chart of a control method of the present invention.
Detailed Description
For a better understanding of the object of the present invention, the data processing manner and function of the control system, the present invention will be described in further detail with reference to the accompanying drawings, and the present invention is not limited to the following embodiments.
As shown in fig. 1, the optimized operation control system of the circulating water pump of the thermal power plant is located in a Distributed Control System (DCS) of a turbo generator set, and includes: the historical data acquisition module is nested in the DCS and is used for acquiring historical operation data from the steam turbine generator unit, the condenser and the circulating water pump unit, and at least comprises unit load, a circulating water pump operation mode, circulating water inlet temperature, circulating water outlet temperature, circulating water pump power and steam turbine exhaust pressure.
Because the thermal power generating unit adjusts the load according to the electric quantity demand at the power grid side in the actual operation process, the load is fluctuated, and the economical efficiency cannot be judged under the unstable working condition. And the steady-state working condition judging module determines the steady-state working condition of the unit in steady operation according to the steady-state working condition judging criterion. According to the embodiment, the steady-state working condition of the unit on engineering application is defined by combining the thermal performance acceptance test rule of the GB/T8117.1-2008 steam turbine with the actual running condition: within 30 minutes, the unit is considered to reach steady state when the difference between the maximum and minimum values of the 5 variables in table 1 is less than twice the absolute value of the fluctuation value.
Table 1 criterion for judging steady-state conditions
After a plurality of stable operation conditions are obtained from the historical data, the data of the stable operation conditions are transmitted to an economy evaluation module, and the module is used for judging the economy of the operation of the steady-state working condition unit under the same working condition and different operation modes of the circulating water pump. For example, a certain 300MW machine is assembled to form two circulating water pumps, one of which is modified at high speed and low speed, and then the circulating water pumps are operated in four modes, namely, one low-speed pump operation (abbreviated as "one low"), one high-speed pump operation (abbreviated as "one high"), one low-speed pump and one high-speed pump operation (abbreviated as "one high-speed pump and one low-speed pump operation) and two high-speed pumps operation (abbreviated as" two high ") simultaneously. The power consumption and the flow rate of the circulating water pump are shown in table 2.
Table 2 data list of different operation modes of circulating water pump
| Operation mode of circulating water pump | Circulating water flow (t/h) | Circulating pump power consumption (kW) |
| "Yi Low" | 17998 | 1063.0 |
| "Yigao" | 21599 | 1388.5 |
| "one high and one low" | 27677 | 2403.9 |
| "two high" | 31678 | 2883.1 |
The operation data of the history of the last year is searched, statistical analysis of the load of the unit and the temperature of the circulating water inlet in the steady-state working condition judging module shows that the fluctuation range of the load of the unit is 150-300 MW, the temperature of the circulating water is 5-36 ℃, and the analysis shows that when the load fluctuation is within 7.5MW and the temperature of the circulating water inlet is 4 ℃, the main operation parameters of the cold end system can be basically unchanged, so that the neighborhood interval of the load and the temperature of the circulating water inlet is 7.5MW and 2 ℃ when the working condition is divided. The working condition data which are the same as the temperature of the 280MW circulating water inlet at 14 ℃ are obtained, the load is 272.5-287.5 MW, and the temperature of the circulating water inlet is 12-16 ℃. The average value of the basic data under different running modes of the circulating water pump is shown in table 3.
TABLE 3 historical data list of operating conditions 280MW and 14℃
According to fig. 2, when the unit load is 280MW, the influence of different operation modes of the circulating water pump on the unit output is shown in table 4.
TABLE 4 Unit output increment for different circulating Water Pump modes of operation
| Running mode change of circulating pump | Circulating pump output increase value kW | Output increasing value kW of unit | Net added value kW |
| "Low" to "high" | 325.5 | 455.616 | 130.1 |
| "high" to "high-low" | 1015.4 | 894.96 | -120.4 |
| "one high and one low" to "two high" | 479.2 | 195.264 | -283.9 |
As can be seen from Table 4, when the operation mode of the 280MW and 14 ℃ circulating water pump is adjusted from "low" to "high", the net output of the unit is increased by 130.1kW, when the operation mode of the circulating water pump is adjusted from "high" to "high" and "low", the net output of the unit is reduced by 120.4kW, and when the operation mode of the circulating water pump is adjusted from "high" to "low" to "high", the net output of the unit is reduced by 283.9kW, so that when the 280MW and 14 ℃ operating mode of the circulating water pump is "high", the unit operation economy is the best, and at the moment, the operation mode of the circulating water pump is the best.
In addition, the economy of the unit under different operation modes of the circulating water pump can be evaluated by adopting a heat loss rate method, and the heat loss of a cold source is minimized by adjusting the number of the operation modes of the circulating water pump, so that the energy consumed by the whole turbo generator unit is minimized, and the operation mode of the circulating water pump is the optimal operation mode. The calculation formula of the heat loss rate is as follows:
wherein q is L Is the heat loss rate (kJ/kW); p (P) e Power for generator (kW); q (Q) 2 For heat (kJ/h) carried away by circulating cooling water, P p Power (kW) of a circulating water pump; p (P) a For other auxiliary power (kW).
The meaning of the heat loss rate is the cold source loss corresponding to the unit internet power, the operation mode of the circulating water pump is switched under the same output power of the generator, when q L And the minimum time is the optimal running mode of the circulating water pump under the load.
The heat loss rate of the unit under different operation modes of the circulating water pump is calculated according to the data of the table 3 and is shown in the table 5.
TABLE 5 Heat loss rate of units under different operation modes of circulating water pumps
| Circulating pump operation mode | Heat loss rate kJ/kW |
| "Yi Low" | 5327.6 |
| "Yigao" | 5298.1 |
| "one high and one low" | 5369.4 |
| "two high" | 5929.4 |
As can be seen from Table 5, when the operation mode of the 280MW and 14 ℃ working condition circulating water pump is 'high', the heat loss rate of the unit is minimum, so that the optimal operation mode of the 280MW and 14 ℃ working condition circulating water pump is 'high'. Therefore, the economy of different running modes of the circulating water pump is evaluated according to a net increase value method and a heat loss rate method of the unit output, and the results are consistent.
As shown in fig. 3, the optimal operation decision module evaluates the optimal operation mode of the circulating water pump under the same working condition according to the economic evaluation result and the load prediction curve, and sends out a control instruction. The specific working procedure is as follows: first, according to a given load prediction curve of the power grid, if the current unit load fluctuates by less than 2.5% over the next 2 hours, the module is triggered as described in table 1. Secondly, retrieving data in the economic evaluation module, (1) judging whether the operation mode of the circulating water pump is the same when the historical operation condition which is the same as the real-time operation condition exists, and if so, updating the economic data in the economic evaluation module under the operation mode; if the running modes are different, comparing the economical efficiency of the real-time running working condition with that of the historical optimal running mode, if the economical efficiency is better, storing the running mode of the circulating water pump under the real-time running working condition as the optimal running mode into an economical efficiency evaluation module, and keeping the running mode to run, otherwise, adjusting the running mode of the circulating water pump to be the historical optimal running mode, so as to realize self-updating of the optimal running mode of the circulating water pump. (2) When the historical operation working condition which is the same as the real-time operation working condition does not exist, the working condition data of the operation mode of the circulating water pump at the moment is stored into the economical efficiency evaluation module, so that the data in the module are more complete.
The optimization operation control method of the circulating water pump comprises the following steps:
s1, acquiring unit operation history data;
specifically, at least unit load, a circulating water pump running mode, circulating water flow, circulating water inlet temperature, circulating water outlet temperature and steam turbine exhaust pressure are obtained.
S2, according to the historical data, obtaining the running mode of the circulating water pump under each steady-state running condition;
specifically, according to a steady-state working condition judgment criterion, as shown in table 1, dividing a steady-state working condition, such as a steady-state working condition 1 load of 272.5-287.5 MW, and a circulating water inlet temperature of 12-16 ℃; the load of the stable working condition 2 is 272.5-287.5 MW, the inlet temperature of the circulating water is 16-18 ℃, and the like.
S3, judging the economy of different circulating water pump operation modes under the same working condition, and recording a historical optimal operation mode;
specifically, according to the stable operation working conditions, the optimal operation mode of the historical circulating water pump under each working condition is recorded.
S4, according to the real-time running condition of the unit, a control instruction is sent out by combining the historical optimal running mode of the circulating water pump and a load prediction curve, and the optimal running mode of the circulating water pump under each working condition is self-learned and updated;
specifically, according to the actual running condition of the unit, the optimal running mode of the circulating water pump in the step S3 is combined with a power grid side load prediction curve, and a running mode adjustment decision of the circulating water pump is made. And self-learning updating is carried out on the optimal running mode of the circulating water pump under each working condition.
What is not described in detail in this specification is all that is known to those skilled in the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (2)
1. The utility model provides a thermal power plant circulating water pump optimization operation control method which is characterized in that the system includes:
the historical data acquisition module is used for acquiring historical operation data of the unit;
the steady-state working condition judgment module is used for determining the steady-state working condition of the unit in the historical data acquisition module in steady operation based on a steady-state working condition judgment criterion;
the economic evaluation module is used for evaluating the economic performance of the running of the unit under the same working condition and different running modes of the circulating water pump under the steady-state working condition, recording the historical optimal running mode of the circulating water pump under each working condition in the module, and self-learning and updating the optimal running mode of the circulating water pump under each working condition according to the real-time running condition of the unit;
the optimal operation decision module is used for evaluating whether the current operation mode of the circulating water pump is optimal or not according to the historical optimal operation mode of the circulating water pump and the load prediction curve under each working condition stored in the economy evaluation module and sending out a control instruction;
the obtaining of the historical operating data of the unit at least comprises the following steps: unit load, operation mode of a circulating water pump, circulating water flow, circulating water inlet temperature, circulating water outlet temperature, circulating water pump power and steam turbine exhaust pressure;
the judgment criteria of the steady-state working condition are as follows: when the running mode of the circulating water pump is the same within 30 minutes or more and the fluctuation of the unit load, the main steam pressure, the main steam temperature, the reheat steam temperature and the feedwater flow is smaller than the allowable value, the running condition is a steady-state condition;
the same working condition means that the deviation of the unit load and the circulating water inlet temperature is smaller than an allowable value;
the economy of the unit operation means that the smaller the heat loss rate of the unit is, the better the operation economy is under the same working condition and different operation modes of the circulating water pump;
the optimal operation mode of the circulating water pump for self-learning and updating of each working condition refers to the condition data stored in the economic evaluation module when the real-time operation working condition of the unit reaches the steady-state working condition requirement; when the historical operation working condition which is the same as the real-time operation working condition exists, if the operation mode of the circulating water pump is the same, updating the economic data under the operation mode in the economic evaluation module; if the running modes of the circulating water pump are different, comparing the economical efficiency of the real-time running working condition with that of the historical optimal running mode, if the economical efficiency of the real-time running working condition is better, storing the running mode of the circulating water pump in the real-time running working condition as the optimal running mode into an economical efficiency evaluation module and keeping the running mode running, otherwise, adjusting the running mode of the circulating water pump to be the historical optimal running mode; when the historical operation working condition which is the same as the real-time operation working condition does not exist, the working condition data of the operation mode of the circulating water pump at the moment is stored into the economic evaluation module, and the operation mode is kept to operate;
the method comprises the following steps:
s1, acquiring unit operation history data;
s2, according to the historical data, obtaining the running mode of the circulating water pump under each steady-state working condition;
s3, evaluating the economy of the unit under the same working condition and different operation modes of the circulating water pump, and recording the historical optimal operation mode of the circulating water pump under each working condition;
and S4, according to the real-time running condition of the unit, combining the historical optimal running mode of the circulating water pump and a load prediction curve, sending out a control instruction, and self-learning and updating the optimal running mode of the circulating water pump under each working condition.
2. The optimal operation control method for the circulating water pump of the thermal power plant according to claim 1, wherein: the economy of unit operation refers to that under the same working condition and different operation modes of the circulating water pump, the larger the difference value between the output increasing value of the unit and the power consumption increasing value of the circulating water pump is, the better the unit operation economy is.
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