CN111720178B - Cold end optimization statistical analysis method for coal-fired generator set based on correlation between power supply coal consumption and investment yield - Google Patents

Cold end optimization statistical analysis method for coal-fired generator set based on correlation between power supply coal consumption and investment yield Download PDF

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CN111720178B
CN111720178B CN202010527098.1A CN202010527098A CN111720178B CN 111720178 B CN111720178 B CN 111720178B CN 202010527098 A CN202010527098 A CN 202010527098A CN 111720178 B CN111720178 B CN 111720178B
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circulating water
water pump
coal
operation mode
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CN111720178A (en
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杨勤
张震伟
王豆
孟瑜炜
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Zhejiang Zheneng Digital Technology Co Ltd
Zhejiang Energy Group Research Institute Co Ltd
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Zhejiang Energy Group Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure

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Abstract

The invention relates to a cold end optimization statistical analysis method of a coal-fired generator set based on correlation of power supply coal consumption and investment profitability, which comprises the following steps: step 1, reading a data measuring point from a set PI system, and performing data preprocessing; and 2, calculating the power supply coal consumption and the investment yield of the selected relevant measuring points within half an hour before and after the change of the running mode of the circulating water pump every time. The invention has the beneficial effects that: the method can be used for cold end optimization of 1050MW coal-fired power generating units, a calculation formula is given based on the statistic analysis of PI data of the power generating units, the internal relation between two optimization indexes of power supply coal consumption and investment yield is deduced, an index selection method for cold end optimization of the power generating units is given based on the internal relation, business personnel can be guided to rapidly carry out cold end optimization operation and obtain a better optimization result, optimization suggestions can be provided for power generating enterprises, and the method has important significance for economic operation of the coal-fired power generating units.

Description

Cold end optimization statistical analysis method for coal-fired generator set based on correlation between power supply coal consumption and investment yield
Technical Field
The invention relates to the field of optimization control of a power generation process of a coal-fired power generation unit, in particular to a cold end optimization statistical analysis method of the coal-fired power generation unit based on correlation between power supply coal consumption and investment yield.
Background
The optimization of the cold end of the coal-fired generator set mainly comprises the energy-saving reconstruction and operation optimization of cold end equipment such as a condenser, a circulating water pump and a cooling tower. The change of the running mode of the circulating water pump can cause the change of condenser vacuum, and the condenser vacuum is a main controllable running parameter influencing the economic running level of the unit, so the optimization of the cold end of the unit is generally referred to as the optimization of the running mode of the circulating water pump if no special description exists.
Research and application of cold end optimization of a coal-fired power generating unit mainly relates to three aspects:
1) the number of the units is as follows: the large and medium-sized coal-fired generating set is usually designed as a unit-making set, and a mode that two sets with the same level and the same type are arranged in parallel is adopted. According to whether circulating water systems of the two units are communicated or not and whether the circulating water systems are used as a whole or not, the operation optimization is carried out, and the cold end optimization can be divided into two situations of a single unit and two units. The former only considers the change of the running mode of the circulating water pump of a single unit, the optimization process is relatively simple, but the energy-saving potential of cold end optimization is not fully excavated. The cold end optimization energy-saving effect of the latter is more obvious than that of the former, but the optimization operation mode is more complicated.
2) Target index: the cold end of the unit is optimized to ensure that the condenser vacuum reaches or approaches an optimal value. The condenser optimal vacuum definition has two types, namely a traditional definition and a new definition, and the corresponding target indexes of the optimization of the cold end of the unit also have two types: firstly, power supply coal consumption; second, the rate of return on investment. The load is controlled by a power grid dispatching instruction in the normal operation of the unit, so that the coal consumption of the unit is reduced when the power of the steam turbine is basically unchanged instead of the power of the steam turbine corresponding to the load after the operation mode of the circulating water pump is changed. It can be seen that the optimization of the cold end of the unit based on the traditional definition of the optimal vacuum of the condenser substantially aims at the lowest coal consumption of the power supply of the unit. The reduction of the electricity price or the increase of the coal price determined by the market can cause the investment yield of the power plant and the coal consumption index of the unit power supply not to keep a one-to-one correspondence. The optimization of the cold end of the unit based on the new definition of the optimal vacuum of the condenser is just the maximum target of the most concerned investment yield in the operation of the power plant.
3) The basic method comprises the following steps: the traditional unit cold end optimization method can be summarized into three methods: calculation, test, and statistical methods. Where statistical methods are relatively more practical.
The calculation method comprises the following main calculation steps: 1) and calculating the power consumption increment after the operation mode of the circulating water pump is changed. 2) And estimating the exhaust pressure of the low-pressure cylinder of the steam turbine after the operation mode of the circulating water pump is changed. 3) And obtaining the power increment of the steam turbine from a correction curve of the exhaust pressure of the low-pressure cylinder to the power of the steam turbine. 4) And calculating the net power increase of the turbine. The calculation method does not need a large amount of experiments, but some approximate processing is needed in the calculation. The whole calculation process reflects the essence of condenser vacuum and optimal vacuum, and lays a theoretical foundation for other methods; the circulating water pump does not need to be started or stopped. However, a plurality of approximations are made in the calculation, so that the method is suitable for design calculation, and has larger errors in practical application.
The main test contents in the test method are as follows: 1) and (5) performing a circulating water pump flow power consumption test. 2) And (5) testing the variable working condition performance of the condenser. 3) And (4) testing the relation between the power of the steam turbine and the exhaust pressure of the low-pressure cylinder. In the test method, data come from field measuring points, but a large number of tests are needed to obtain the optimal operation mode of the circulating water pump under different unit loads and different temperature conditions. The actual running condition of the unit can be reflected best; the data source is accurate and reliable. But the circulating water pump needs to be started and stopped, and the test constraint conditions are more.
Statistical parameters used in the statistical method: 1) reflecting parameters related to the change conditions of the running mode of the circulating water pump; 2) judging parameters of the running mode change state of the circulating water pump; 3) and parameters reflecting the change effect of the running mode of the circulating water pump. The data used by the statistical method come from a unit PI system, and the statistical method is a more practical method. The statistical data come from many aspects and are accurate; the historical experience and the teaching can be fully absorbed; and the start-stop test of the circulating water pump is not required. However, a lot of statistics is needed to check whether the historical working conditions are consistent with the actual working conditions.
In conclusion, the statistical method is more practical; therefore, it is very important to provide a cold end optimization statistical analysis method for a coal-fired power generating unit based on the correlation between the power supply coal consumption and the investment yield.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a cold end optimization statistical analysis method of a coal-fired power generating set based on the correlation between power supply coal consumption and investment yield.
The cold end optimization statistical analysis method of the coal-fired generator set based on the correlation between the power supply coal consumption and the investment yield comprises the following steps:
step 1, reading a data measuring point from a set PI system, and performing data preprocessing:
step 1.1, selecting an average value or an accumulated value of relevant measured point data within half an hour before and after the change of a circulating water pump operation mode in order to reduce the influence of inaccurate measured point data such as coal amount measurement of a belt weigher of a coal feeder and the like and difficulty in online measurement of a low calorific value of as-fired coal on the standard coal consumption of a unit as far as possible;
step 1.2, in order to ensure that the change of the on-grid electric quantity is only caused by the change of the running mode of the circulating water pump under the condition that the load of the unit is basically stable by a power grid dispatching instruction, the start-stop operation of a coal mill, an absorption tower slurry circulating pump, a three-large fan and other large auxiliary equipment is not needed to be confirmed within half an hour after the running mode of the circulating water pump is changed;
step 2, calculating the power supply coal consumption and the investment yield of the selected relevant measuring points within half an hour before and after the change of the running mode of the circulating water pump every time:
step 2.1, calculating the standard coal amount B in unit hourb：
Figure BDA0002533975220000031
In the above formula BrlThe sum of coal amount of the coal feeder in unit hour is ton;
Figure BDA0002533975220000032
the unit is kJ/kg for receiving the base low-level calorific value of the coal as fired; qnetThe value is 29307.6kJ/kg for the low calorific value of the standard coal;
step 2.2, calculating the power supply coal consumption b of the unitg：
Figure BDA0002533975220000033
W in formula (2)gThe unit hour is the unit on-line electric quantity, namely the product of main transformer active power and time, and the unit is kW.h;
step 2.3, calculating the change delta b of the coal consumption of the power supply of the unit before and after the change of the operation mode of the circulating water pumpg：
Figure BDA0002533975220000034
In the formula (3) Bb1And Bb2Respectively marking the coal quantity in unit hour in ton within half an hour before and after the change of the running mode of the circulating water pump; wg1And Wg2The unit hour power on line is kW.h within half an hour before and after the operation mode of the circulating water pump is changed;
step 2.4, calculating the investment yield r:
Figure BDA0002533975220000035
p in formula (4)eThe unit is yuan/(kW.h) for the price of power on the internet; pcThe price of the marked coal is as follows: the unit is yuan/ton;
step 2.5, calculating the change delta r of the investment profitability before and after the change of the running mode of the circulating water pump:
Figure BDA0002533975220000036
p in formula (5)e1And Pe2The unit of the power price of the on-line water before and after the operation mode of the circulating water pump is changed is yuan/(kW.h); pc1And Pc2Respectively marking the coal price before and after the operation mode of the circulating water pump is changed: the unit is yuan/ton;
assuming that the power price and the coal price of the on-line water supply remain unchanged before and after the operation mode of the circulating water pump is changed, namely Pe2＝Pe1＝Pe、Pc2＝Pc1＝PcAfter the formula (5) is finished and substituted into the formula (3), the formula is simplified into the formula:
Figure BDA0002533975220000041
step 3, the conclusion that the conclusion of the change of the running mode of the circulating water pump is completely equivalent is judged by using two indexes of the coal consumption of the unit power supply and the investment yield when the power price of the on-line water and the price of the marked coal are kept unchanged before and after the running mode of the circulating water pump is changed according to the formula (6), namely whether the optimized index selection of the cold end of the unit is determined by the change of the power price and the coal price before and after the running mode of the circulating water pump is changed:
if the electricity price and the coal price are not changed before and after the operation mode of the circulating water pump is changed, judging the operation mode change of the circulating water pump by using the coal consumption of unit power supply or the unit investment yield;
if the electricity price and the coal price are changed before and after the operation mode of the circulating water pump is changed, judging the operation mode change of the circulating water pump by using the unit investment yield index;
step 4, drawing a unit circulating water pump operation optimization chart according to the calculation result of the step 3, giving a fitting formula of each circulating water pump operation mode switching critical line, and obtaining a unit cold end optimization strategy:
step 4.1, drawing a unit circulating water pump operation optimization chart according to the calculation result of the step 3, and giving a fitting formula of each circulating water pump operation mode switching critical line: taking the temperature of circulating water at the inlet of a condenser as an abscissa and the active power generated by a unit as an ordinate, and drawing a fitting formula of switching critical lines of the operating modes of each circulating water pump in single-machine operation and double-machine operation according to working condition points close to the switching critical points of each operating mode of the circulating water pump and relatively better working condition points of each operating mode of the circulating water pump;
when the market electricity price and the coal price change, the changed market electricity price and the changed coal price are substituted into the formulas (1) to (5), and data before and after each time of running mode change of the circulating water pump are recalculated to obtain a new circulating water pump switching critical line;
and 4.2, obtaining a unit cold end optimization strategy: if the coal consumption of the power supply of the unit is reduced or the investment yield of the unit is increased after the operation mode of the circulating water pump is changed, the changed operation mode is more optimal; if the unit power supply coal consumption is increased or the unit investment yield is reduced after the operation mode of the circulating water pump is changed, the operation mode before the change is more optimal; if the unit power supply coal consumption and the unit investment yield change range are small after the operation mode of the circulating water pump is changed, the working point is close to the critical point of switching two adjacent operation modes of the circulating water pump.
Preferably, the data of the relevant measuring points in the step 1.1 meet the condition that the load rate change and the main steam pressure change of each unit are less than or equal to 3% in half an hour before and after the operation mode of the circulating water pump changes.
Preferably, the fitting formula of the critical line in the step 4.1 is used for guiding the power plant operator to perform the optimization operation of the cold end of the unit.
The invention has the beneficial effects that: the method can be used for cold end optimization of 1050MW coal-fired power generating units, a calculation formula is given based on the statistic analysis of PI data of the power generating units, the internal relation between two optimization indexes of power supply coal consumption and investment yield is deduced, an index selection method for cold end optimization of the power generating units is given based on the internal relation, business personnel can be guided to rapidly carry out cold end optimization operation and obtain a better optimization result, optimization suggestions can be provided for power generating enterprises, and the method has important significance for economic operation of the coal-fired power generating units. The invention embodies the concept of mining the operation experience knowledge of operators of the power plant from historical big data, is not only suitable for cold end optimization of two researched 1000MW grades of coal-fired power generation, but also can be popularized to other 1000MW, 600MW and 300MW grades of closed cycle coal-fired power generating sets.
Drawings
FIG. 1 is a diagram of a cold-end system arrangement of a unit in an embodiment;
FIG. 2 is a diagram showing the influence of the change of the operation mode of the circulating water pump on the coal consumption and the investment yield of the unit power supply;
in fig. 3, a) is a circulation water pump operation optimization diagram for single machine operation, and b) is a circulation water pump operation optimization diagram for double machine operation.
Description of reference numerals: the system comprises a communication valve 1, a circulating water pump A2, a circulating water pump B3, a circulating water pump C4 and a circulating water pump outlet valve 5.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
The invention provides a calculation formula and deduces the internal relation of two optimization indexes of power supply coal consumption and investment profitability based on the statistic analysis of the PI data of the unit, provides an index selection method for cold end optimization of the unit based on the internal relation, and can obtain a circulating water pump operation optimization chart for guiding cold end optimization operation of power plant operators and a fitting formula of a switching critical line. The method provided by the invention can guide business personnel to quickly carry out cold end optimization operation and obtain a better optimization result, can provide optimization suggestions for power generation enterprises, has important significance for economic operation of a coal-fired power generating set, and has wide popularization prospects.
The optimization idea of the invention is as follows:
1) cold side optimization should cover as much of the time periods of single machine operation and dual machine operation as possible. The vacuum value of the condenser is close to the lower limit, except short-time special operation working conditions such as multiple operation circulating water pumps and one-machine double-tower operation in summer.
2) The target index of cold end optimization should take into account two conditions of power supply coal consumption and investment yield, and is selected by related personnel of the power plant according to the condition.
3) And the utilization of the PI data of the unit is emphasized. The unit PI system records data before and after operation of the change of the running mode of the circulating water pump in the past, and the data are subjected to statistical analysis according to selected target indexes to obtain a unit cold end optimization strategy.
The invention will be further described in detail with reference to the accompanying drawings and two specific examples of 1050MW coal-fired power generating units of a certain coastal power plant.
As shown in fig. 1, the turbines of the two units are ultra supercritical, single shaft, four cylinder, four steam exhaust, double back pressure, condensing turbines. Each turbine is equipped with high-pressure and low-pressure condensers, and 3 circulating water pumps (a circulating water pump A2, a circulating water pump B3 and a circulating water pump C4) supply circulating cooling water. And a communicating valve 1 is arranged on the inlet and outlet circulating water main pipe of each unit circulating water pump. When two machine sets operate simultaneously, the communicating valve 1 is in an opening state; and a circulating water pump outlet valve 5 is arranged behind each unit circulating water pump.
The specific process of the cold end optimization statistical analysis method of the coal-fired generator set based on the correlation between the power supply coal consumption and the investment yield is as follows:
step 1: and (4) preprocessing data. The method specifically comprises the following substeps:
step 1.1: in order to reduce the influence of inaccurate measurement point data such as coal amount measurement of a belt scale of a coal feeder and the like and difficulty in online measurement of low calorific value of as-fired coal on the standard coal consumption of the unit as far as possible, the average value or the accumulated value of the relevant measurement point data in half an hour before and after the operation mode of the circulating water pump is changed is selected, and the load rate change and the main steam pressure change of each unit are not more than 3% in half an hour before and after the operation mode of the circulating water pump is changed;
step 1.2: in order to ensure that the change of the on-grid electric quantity is only caused by the change of the running mode of the circulating water pump under the condition that the load of the unit is basically stable by a power grid dispatching instruction, the start-stop operation of other large-scale auxiliary equipment such as a coal mill, an absorption tower slurry circulating pump, a three-large fan and the like is not needed to be confirmed within half an hour after the running mode of the circulating water pump is changed. Through screening, the number of times of the running mode change of the circulating water pump meeting the conditions is found to be 121.
Step 2: and (4) calculating and analyzing related parameters such as power supply coal consumption, investment yield and the like. The operation modes of the unit circulating water pump related to the operation mode change of the 121-time circulating water pump include 8 modes of one-machine one-pump, one-machine two-pump, one-machine three-pump, two-machine two-pump, two-machine three-pump, two-machine four-pump, two-machine five-pump and two-machine six-pump under the single-machine operation. Calculating relevant parameters before and after half an hour of each change of the running mode of the circulating water pump, wherein the step specifically comprises the following substeps:
step 2.1: calculating the unit hour standard coal quantity Bb
Figure BDA0002533975220000061
In the formula (1) BrlThe sum of coal amount of the coal feeder in unit hour is ton;
Figure BDA0002533975220000062
the unit of kJ is the low calorific value of the coal as fired/kg；QnetThe value is 29307.6kJ/kg for the lower calorific value of the standard coal.
Step 2.2: computer set power supply coal consumption bg
Figure BDA0002533975220000063
W in formula (2)gThe unit hour is the unit on-line electric quantity, namely the product of main transformer active power and time, and the unit is kW.h.
Step 2.3: calculating the change delta b of the coal consumption of the power supply of the unit before and after the change of the running mode of the circulating water pumpg
Figure BDA0002533975220000071
In the formula (3) Bb1、Bb2Respectively marking the coal quantity in unit hour in ton within half an hour before and after the change of the running mode of the circulating water pump; wg1、Wg2The unit hour power on line is kW.h within half an hour before and after the change of the operation mode of the circulating water pump.
Step 2.4: calculating the rate of return on investment r
Figure BDA0002533975220000072
P in formula (4)eThe unit is yuan/(kW.h) for the price of power on the internet; pcThe price of the marked coal is as follows: the unit is yuan/ton.
Step 2.5: calculating the change delta r of the investment profitability before and after the change of the running mode of the circulating water pump
Figure BDA0002533975220000073
P in formula (5)e1、Pe2Respectively the unit of the power price of the on-line before and after the change of the running mode of the circulating water pump is yuan/kW.h; pc1、Pc2Respectively for circulating water pumpMarking coal price before and after line mode change: the unit is yuan/ton.
The price of the power on the internet and the price of the marked coal can be considered to be unchanged before and after the operation mode of the circulating water pump is changed, namely Pe2＝Pe1＝PeAnd Pc2＝Pc1＝PcAfter the formula (5) is finished and substituted into the formula (3), the formula is simplified into the formula:
Figure BDA0002533975220000074
the formula (6) shows that the conclusion of judging the change of the operation mode of the circulating water pump by using two indexes of the unit power supply coal consumption and the investment yield is completely equivalent when the price of the power supply for surfing the internet and the price of the coal marked are kept unchanged before and after the operation mode of the circulating water pump is changed. According to the practical situation of the experiment: 0.42 yuan/kW.h, 773.8 yuan/ton and 21594.3kJ/kg are taken. If the two machines are operated, the two machines are regarded as a whole to be calculated. Three representative examples of calculations using the above formula are shown in the table below. The following table 1 is a calculation table for switching a two-machine four-pump mode into a two-machine five-pump mode, namely after one circulating water pump is started, the power supply coal consumption is reduced and the investment profitability is increased, and the operation mode after the pump is started is better;
TABLE 1 example table for switching two-machine four-pump to two-machine five-pump
Figure BDA0002533975220000081
The following table 2 is an example table for switching one circulation water pump into two pumps, namely, after one circulation water pump is started, the power supply coal consumption is increased and the investment yield is reduced; the operation mode before starting the pump is better.
TABLE 2 example table for switching one-machine-two-pump to one-machine-three-pump
Figure BDA0002533975220000082
The following table 3 is a calculation table for switching a two-machine two-pump to a two-machine three-pump, that is, after one circulating water pump is started at this time, the variation range of the power supply coal consumption and the investment yield of the unit is very small. The working condition point at this time is very close to the critical point of switching two modes of the two-machine two-pump and the two-machine three-pump.
TABLE 3 example table for switching two-machine two-pump to two-machine three-pump
Figure BDA0002533975220000083
The optimization strategy can be obtained and verified through the steps and the analysis: the optimized index selection of the cold end of the unit is determined by whether the electricity price and the coal price change before and after the operation mode of the circulating water pump changes. If not, the judgment results of the two indexes of the coal consumption and the investment yield are equivalent; if the electricity price and the coal price change, the investment earning rate is suitable. A graph of the influence of the change of the operation mode of the circulating water pump on the coal consumption and the return on investment of the power supply of the unit is shown in figure 2, and figure 2 combs and compares the influence of the change of the operation mode of the circulating water pump on the coal consumption and the return on investment of the power supply of the unit from the perspective of system thinking.
Taking the temperature of circulating water at the inlet of the condenser as an abscissa and the active power generated by the unit as an ordinate, and drawing a circulating water pump operation optimization diagram for single-machine operation and double-machine operation and a critical line fitting formula for switching the operating modes of the circulating water pump according to the operating condition points close to the critical points of the operating modes of the circulating water pump and the operating condition points with relatively better operating modes of the circulating water pump as shown in the following table 4.
Table 4 critical line fitting formula table for operation mode switching of circulating water pump
Figure BDA0002533975220000084
Figure BDA0002533975220000091
In the above table 4, x represents the condenser inlet circulating water temperature in units; y represents the active power generated by the unit,unit 103kW; x and y respectively correspond to the abscissa and the ordinate of the running optimization chart (namely, figure 3) of the circulating water pump.
And the power plant operator can decide the optimal operation mode of the circulating water pump under different unit loads and different condenser inlet circulating water temperatures (corresponding to the atmospheric environment temperature) in real time.

Claims (3)

1. A cold end optimization statistical analysis method for a coal-fired power generating unit based on correlation between power supply coal consumption and investment profitability is characterized by comprising the following steps:
step 1, reading a data measuring point from a set PI system, and performing data preprocessing:
step 1.1, selecting an average value or an accumulated value of relevant measured point data within half an hour before and after the change of the operation mode of the circulating water pump;
step 1.2, confirming that starting and stopping operations of a coal mill, an absorption tower slurry circulating pump and three fans are not performed within half an hour after the operation mode of the circulating water pump is changed;
step 2, calculating the power supply coal consumption and the investment yield of the selected relevant measuring points within half an hour before and after the change of the running mode of the circulating water pump every time:
step 2.1, calculating the standard coal amount B in unit hourb：
Figure FDA0003527404430000011
In the above formula BrlThe sum of coal amount of the coal feeder in unit hour is ton;
Figure FDA0003527404430000012
the unit is kJ/kg for receiving the base low-level calorific value of the coal as fired; qnetThe value is 29307.6kJ/kg for the low calorific value of the standard coal;
step 2.2, calculating the power supply coal consumption b of the unitg：
Figure FDA0003527404430000013
W in formula (2)gThe unit hour is the unit on-line electric quantity, namely the product of main transformer active power and time, and the unit is kW.h;
step 2.3, calculating the change delta b of the coal consumption of the power supply of the unit before and after the change of the operation mode of the circulating water pumpg：
Figure FDA0003527404430000014
In the formula (3) Bb1And Bb2Respectively marking the coal quantity in unit hour in ton within half an hour before and after the change of the running mode of the circulating water pump; wg1And Wg2The unit hour power on line is kW.h within half an hour before and after the operation mode of the circulating water pump is changed;
step 2.4, calculating the investment yield r:
Figure FDA0003527404430000015
p in formula (4)eThe unit is yuan/(kW.h) for the price of power on the internet; pcThe price of the marked coal is as follows: the unit is yuan/ton;
step 2.5, calculating the change delta r of the investment profitability before and after the change of the running mode of the circulating water pump:
Figure FDA0003527404430000021
p in formula (5)e1And Pe2The unit of the power price of the on-line water before and after the operation mode of the circulating water pump is changed is yuan/(kW.h); pc1And Pc2Respectively marking the coal price before and after the operation mode of the circulating water pump is changed: the unit is yuan/ton;
assuming that the power price of the on-line water and the price of the marked coal are kept unchanged before and after the operation mode of the circulating water pump is changed, the formula (5) is arranged and substituted into the formula (3), and then the operation mode is simplified:
Figure FDA0003527404430000022
and step 3, obtaining the following result from the formula (6):
if the electricity price and the coal price are not changed before and after the operation mode of the circulating water pump is changed, judging the operation mode change of the circulating water pump by using the coal consumption of unit power supply or the unit investment yield;
if the electricity price and the coal price are changed before and after the operation mode of the circulating water pump is changed, judging the operation mode change of the circulating water pump by using the unit investment yield index;
step 4, drawing a unit circulating water pump operation optimization chart according to the calculation result of the step 3, giving a fitting formula of each circulating water pump operation mode switching critical line, and obtaining a unit cold end optimization strategy:
step 4.1, drawing a unit circulating water pump operation optimization chart according to the calculation result of the step 3, and giving a fitting formula of each circulating water pump operation mode switching critical line: drawing a fitting formula of each circulating water pump operation mode switching critical line of single-machine operation and double-machine operation according to working condition points close to each operating mode switching critical point of the circulating water pump by taking the circulating water temperature at the inlet of the condenser as an abscissa and the active power generated by the unit as an ordinate;
when the market electricity price and the coal price change, the changed market electricity price and the changed coal price are substituted into the formulas (1) to (5), and data before and after each time of running mode change of the circulating water pump are recalculated to obtain a new circulating water pump switching critical line;
and 4.2, obtaining a unit cold end optimization strategy: if the coal consumption of the power supply of the unit is reduced or the investment yield of the unit is increased after the operation mode of the circulating water pump is changed, the changed operation mode is more optimal; if the unit power supply coal consumption is increased or the unit investment yield is reduced after the operation mode of the circulating water pump is changed, the operation mode before the change is more optimal; if the unit power supply coal consumption and the unit investment yield change range are small after the operation mode of the circulating water pump is changed, the working point is close to the critical point of switching two adjacent operation modes of the circulating water pump.
2. The cold end optimization statistical analysis method for the coal-fired power generating unit based on the correlation between the coal consumption and the return rate of investment as claimed in claim 1, wherein the cold end optimization statistical analysis method comprises the following steps: and in the step 1.1, the related measuring point data meet the requirement that the load rate change and the main steam pressure change of each unit are less than or equal to 3% in half an hour before and after the operation mode of the circulating water pump changes.
3. The cold end optimization statistical analysis method for the coal-fired power generating unit based on the correlation between the coal consumption and the return rate of investment as claimed in claim 1, wherein the cold end optimization statistical analysis method comprises the following steps: and 4.1, a fitting formula of the critical line in the step 4.1 is used for guiding power plant operators to carry out unit cold end optimization operation.
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