CN111339479A - Calculation method for standard-reaching emission real-time concentration limit value of pollutants of thermal power generating unit - Google Patents
Calculation method for standard-reaching emission real-time concentration limit value of pollutants of thermal power generating unit Download PDFInfo
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Abstract
A calculation method for a real-time concentration limit value of pollutant emission of a thermal power generating unit reaching the standard comprises the following steps: 1) reading historical data of pollutant emission concentration in the time period from the current hour integer to the current moment from a pollutant emission real-time database; carrying out time weighted summation on historical emission concentration to obtain a pollutant emission concentration time integral value and a pollutant emission concentration average value in a current hour elapsed period, 2) sequentially calculating an emission progress, a time progress and a progress difference according to an emission standard; 3) judging whether the pollutant emission exceeds the standard in the current hour according to the progress value in the pollutant emission period, and jumping to the step 4 if the pollutant emission exceeds the standard; if the pollutant emission is not out of standard, calculating the pollutant emission real-time concentration limit value in the remaining time period of the current hour according to the set control distance; 4) if the current hour exceeds the standard, the emission concentration limit value within one time of exceeding the standard is calculated, and accountability and fine are avoided. The method can obtain the standard exceeding judgment result at the first time at the speed of second level.
Description
Technical Field
The invention relates to the technical field of power plant monitoring, in particular to a calculation method for a real-time concentration limit value of standard emission of pollutants of a thermal power generating unit.
Background
The country and part places make strict regulations on the emission standard of pollutants in the operation of the thermal power generating unit, and whether the hourly average emission concentration is smaller than the emission standard limit value is taken as a judgment index for whether the emission standard is met. The influence factors of pollutant emission concentration in the unit operation are many, and relate to factors such as combustion mode, coal quality, coal supply quantity, pollutant remover quality, pollutant remover flow, equipment operating conditions and the like. In the actual operation process of the unit, the instantaneous emission concentration often changes between the upper standard and the lower standard, and the result of whether the unit reaches the standard or not can be seen on the website of the environmental protection bureau after the hour is over. In order to ensure that the average concentration of pollutants in the whole hour does not exceed the standard, an operator needs to know the regulation result of the elapsed time in the current hour in time and also needs to know the emission limit value in the remaining time period, such as poor control of the elapsed time in the current hour, so as to adjust and remedy the pollutants in time.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a method for calculating the standard-exceeding pollutant emission real-time concentration limit of a thermal power generating unit, which is used for extracting historical emission concentration data after confirming that acquisition source data are reliable and time synchronization is performed, calculating the time integral value and the average value of the pollutant emission concentration in the elapsed time period of the current hour, calculating the emission progress, the time progress and the progress difference according to the emission standard, and finally calculating the emission limit in the residual time period of the current hour according to the set control distance. The emission concentration in the present invention refers to a reduced value.
In order to achieve the purpose, the invention adopts the following technical scheme:
a calculation method for a real-time concentration limit value of pollutant emission of a thermal power generating unit reaching the standard comprises the following steps:
a calculation method for a real-time concentration limit value of pollutant emission of a thermal power generating unit reaching the standard comprises the following steps:
1) reading the current hour integral point T from the pollutant discharge real-time database0To the current time TnHistorical data of pollutant emission concentration in a time period, if no corresponding historical original data exists at an integral point time, linear difference value calculation is needed to obtain corresponding data at the integral point time, and n groups of historical data (T) of pollutant emission concentration are obtained0,C0)…(Ti,Ci)…(Tn,Cn) Wherein (T)i,Ci) Is shown at TiThe concentration of pollutant emission at the moment is CiWill TiThe second value of 3600 seconds corresponding to the time is recorded as SiCarrying out time weighted summation on the historical pollutant emission concentration, and calculating to obtain a pollutant emission concentration time integral value M in the elapsed time period of the current houraAnd the average value Z of the pollutant emission concentrationa；
Time integral value M of pollutant emission concentrationaCalculating an expression:
wherein: ciThe unit is mg/m3，SiIs in seconds and is recorded as s, MaIn units of mg.s/m3；
Mean value of pollutant emission concentration ZaThe calculation expression of (1):
Za＝Ma/Sn(2)
wherein: snIs the current time TnCorresponding to the second value in 3600 seconds, the unit is s;
2) according to the time integral value M of pollutant emission concentrationaAnd standard value B of pollutant emission concentrationgCalculating the concentration discharge progress P of the pollutants at the current houraCalculating the elapsed time progress P of the current hourbDischarge progress P from the concentration of pollutants at the current houraMinus the elapsed time progress P of the current hourbObtaining a progress difference delta P;
the calculation expression of the pollutant concentration emission progress at the current hour is as follows:
Pa＝100*Ma/(3600*Bg) (3)
a computational expression of the current hour elapsed time progress:
Pb＝100*Sn/3600 (4)
3) according to the discharge schedule PaJudging whether the pollutant emission in the current hour exceeds the standard or not: such as PaIf the discharge rate is more than 100, judging that the pollutant discharge in the current hour exceeds the standard, and directly jumping to the step 4; such as PaLess than 100, the pollutant emission in the current hour does not exceed the standard, and the control distance B of the red line operation is pressed according to the set pollutant emission concentrationfCalculating the real-time pollutant emission concentration limit value Z in the remaining time period of the current hour1；
Real-time concentration limit for pollutant emissions Z1The calculation expression of (1):
4) the pollutant emission per hour exceeds the standard, if the pollutant emission per hour exceeds the standard and more than one time, P isaIf the hour is more than 200, the calculation of the hour is stopped; if the standard is exceeded and is within one time, the P is more than 100aIf the control target value is less than 200, the control standard is required to be within one time, otherwise, the power generation enterprises cannot enjoy the environment-friendly electricity price and still accept fine and be blamed for, and at the moment, the control target value is within one time of the standard, and the calculation standard is required to be within one time of the standardReal-time concentration limit for internal emissions Z2；
Real-time concentration limit Z of emissions within one time of exceeding standard2The calculation expression of (1):
the invention discloses a calculation method for a real-time concentration limit value of standard emission of pollutants of a thermal power unit, and supports three pollutants SO of the thermal power unit2、NOxAnd dust calculation.
The invention takes a continuous flue gas emission monitoring system (CEMS) or a data acquisition instrument as a data acquisition source, stores operation data into a real-time library of a Distributed Control System (DCS) or a plant-level monitoring information system (SIS), provides a calculation method of the standard-reaching emission real-time concentration limit value of pollutants of a thermal power generating unit based on a specified emission standard and a set control distance, calculates the time integral value, the average value and the standard-reaching emission limit value in the remaining period of the current hour pollutant emission concentration, calculates the current emission progress and time progress, calculates the difference between the current emission progress and the time progress and other data, and can display the calculation result in real time in a DCS or SIS monitoring picture for operators to refer. Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention supports the calculation of the real-time pollutant emission control result of the current hour at the speed of second level, including the emission concentration time integral value, the emission progress, the time progress and the progress difference, and can be displayed in real time in a DCS in an intuitive mode.
2. The method supports real-time calculation of the pollutant emission standard emission limit value in the remaining time period of the current hour at the speed of second level, can be displayed in real time in a DCS in an intuitive mode, provides the reference limit value of pollutant emission standard control for operating personnel, and can be used as the reference basis of operation control.
3. If the operation exceeds the standard, the method can obtain the exceeding judgment result at the first time at the speed of second level, and does not need to wait for hours to end, and simultaneously calculate the pollutant emission limit value within one time exceeding the standard, and can be displayed in real time in a DCS in a visual mode to be used as a reference basis for operation control.
4. The invention relates to a general calculation method for supporting three pollutants SO of a thermal power generating unit2、NOxDust calculation, real-time data source may be instantaneous or minute mean.
5. The measuring points and data amount used for calculation are small, the calculation is simple and convenient, and the realization is easy.
Drawings
FIG. 1 is an explanatory diagram of the calculation method of the present invention.
Detailed Description
The invention is described in further detail below with reference to fig. 1 and examples of applications in engineering.
The data source of the invention can adopt the real-time data of the CEMS or the data acquisition instrument, the real-time data of the data acquisition instrument can be instantaneous values or minute mean values, the database can adopt a DCS real-time base or an SIS real-time base as a data storage historical base, and the final calculation result is correspondingly displayed according to the position of the calculation real-time base. In order to facilitate reference of operators and obtain better real-time performance, the real-time performance is implemented in a DCS (distributed control system), a real-time library is a DCS real-time library, the calculation process of data and the display of calculation results are completed in the DCS, and the method aims at three pollutants SO of the thermal power generating unit2、NOxAnd performing related calculation on the dust, wherein the calculation frequency in the implementation process is consistent with the acquisition frequency of the data source.
The embodiment of the invention provides a method for calculating a real-time concentration limit value of pollutant discharged by a thermal power generating unit after reaching the standard, which comprises the following steps:
1. after the GPS clock is used for confirming that the time of the CEMS and the time of the calculation server are both taken and are periodically synchronized, SO is calculated according to the real-time coal feeding quantity, the sulfur calculation and the like2Theoretical real time value of produced amount SO'2(m); according to the actual measurement of the flue gas flow and the raw flue gas SO by CEMS2Concentration to obtain SO2Actually measured calculation value SO of amount of production "2(m), mixing SO'2(m) and SO "2(m) comparing and checking the validity of the CEMS measurement result.
1) The most common electric dust remover is selected by the dust removing mode of the machine setDust collector, SO2Theoretical real time value of produced amount SO'2The computational expression of (m) is as follows:
SO'2(m)＝2*K*G*(1-Q4/100)*Sar/100
wherein K is the conversion of sulfur to SO in the combustion process of coal2The ratio of (A) to (B);
g is the real-time coal feeding amount in the boiler combustion process, t/h;
Q4heat loss due to incomplete combustion of the boiler machinery;
Sarthe test value of the current day should be adopted for the received basic sulfur content,%, of the fire coal.
2)SO2Actually measured calculation value SO of amount of production "2The computational expression of (m) is as follows:
SO”(m)＝L*R*10-6
wherein L is the measured value of the flow rate of the raw flue gas, Nm3/h；
R is raw flue gas SO2Reduced concentration in mg/m3。
Prepared from SO'2(m) and SO "2And (m) comparing, wherein the units of the two calculation results need to be unified, the unit is converted into kg/h, and if the deviation of the two calculation results exceeds 10%, the CEMS is verified and calibrated.
Specifically, the method comprises the following steps: the power plant is generally provided with a GPS satellite synchronous clock device during planning and construction, network time synchronization service is provided through an NTP (network time protocol), and clock synchronous sources of a CEMS (central office system monitoring system), a data acquisition instrument and a computing server are checked to be GPS clocks; if no GPS clock exists, the clock synchronization can be manually carried out, the CEMS clock is ensured to be synchronous with the Beijing time, and the calculation server is synchronous with the CEMS; for the pulverized coal furnace, the upper limit value of K is 0.9; sarThe test value of the coal quality of the day is adopted for the received basic sulfur content of the fire coal; the variation of load in operation causes the parameter to be unstable, and G, L, R in the formula (1) and the formula (2) is recommended to be calculated by adopting a mean value of 10 minutes.
2. Reading the current hour integral point T from the pollutant discharge real-time database0To the current time TnHistorical data of pollutant emission concentration in time period, e.g. no at all timeCorresponding to the historical original data, calculating by using a linear difference value to obtain corresponding data of an integral point time to obtain n groups of pollutant emission concentration historical data (T)0,C0)…(Ti,Ci)…(Tn,Cn) Wherein (T)i,Ci) Is shown at TiThe concentration of pollutant emission at the moment is CiWill TiThe second value of 3600 seconds corresponding to the time is recorded as SiCarrying out time weighted summation on the historical pollutant emission concentration, and calculating to obtain a pollutant emission concentration time integral value M in the elapsed time period of the current houraAnd the average value Z of the pollutant emission concentrationa；
Time integral value M of pollutant emission concentrationaCalculating an expression:
wherein: ciThe unit is mg/m3，SiIs in seconds and is recorded as s, MaIn units of mg.s/m3；
Mean value of pollutant emission concentration ZaThe calculation expression of (1):
Za＝Ma/Sn(2)
wherein: snIs the current time TnCorresponding to the second value in 3600 seconds, the unit is s;
3. according to the time integral value M of pollutant emission concentrationaAnd standard value B of pollutant emission concentrationgCalculating the concentration discharge progress P of the pollutants at the current houraCalculating the elapsed time progress P of the current hourbDischarge progress P from the concentration of pollutants at the current houraMinus the elapsed time progress P of the current hourbObtaining a progress difference delta P;
the calculation expression of the pollutant concentration emission progress at the current hour is as follows:
Pa＝100*Ma/(3600*Bg) (3)
a computational expression of the current hour elapsed time progress:
Pb＝100*Sn/3600 (4)
the calculation expression of the emission progress and time progress difference is as follows:
ΔP＝Pa-Pb
specifically, the method comprises the following steps: the interpolation at the integral point time is calculated to carry out linear interpolation according to the time; for BgIf the local pollutant emission standard is defined, the local specification is taken as the standard, if the local specification is not defined, the national standard is taken as the standard, and the delta P is positive, the current emission average concentration exceeds the limit value, the emission concentration in the rest period can reach the hour average concentration without exceeding the standard only if the emission concentration is lower than the emission standard, and the larger the delta P is, the lower the subsequent emission concentration needs to be controlled; the negative delta P represents that the current average emission concentration is lower than the limit value, the emission concentration in the remaining time period can be properly higher than the emission standard, and the larger the absolute value of delta P is, the subsequent emission concentration control value can be properly improved; the calculation of these data is performed at a certain frequency (including the calculations in steps 3 and 4, which are not repeated later), and the loop calculation is performed over time, and if the remaining time is too short (less than 1 minute), the adjustment is not in time, so that the next hour is waited for.
4. According to the concentration discharge progress P of the pollutants at the current houraAnd judging whether the pollutant emission in the current hour exceeds the standard or not. Such as PaIf the discharge time is more than 100, judging that the pollutant discharge exceeds the standard in the current hour, and directly jumping to the step 4, wherein the method can obtain the exceeding judgment result in the first time without waiting for the end of the hour; such as PaLess than 100, the pollutant emission in the current hour does not exceed the standard, and the control distance B of the red line operation is pressed according to the set pollutant emission concentrationfReferring to FIG. 1, a real-time pollutant emission concentration limit Z for the remaining period of the current hour is calculated1。
Real-time concentration limit for pollutant emissions Z1The computational expression of (2).
In the formula BfAnd pressing the control distance of red line operation for the set pollutant emission concentration.
Specifically, the method comprises the following steps: in the actual operation control process, the control result may have a certain deviation from the target, and the line pressing operation is not required as much as possible, so that the control distance of the pollutant emission concentration needs to be set, and the standard 10% is generally adopted.
5. The pollutant emission per hour is out of standard, such as being out of standard and more than one time (P)a> 200), the calculation of the hour is stopped; if the standard is exceeded and is within one time (100 < P)aLess than 200), the standard exceeding is required to be controlled within one time, otherwise, the power generation enterprises cannot enjoy the environment-friendly electricity price and still accept fine and be blamed for, at the moment, the target value of the control is within one time of the standard exceeding, and the real-time concentration limit value Z of the emission within one time of the standard exceeding is required to be calculated2。
Real-time concentration limit Z of emissions within one time of exceeding standard2The computational expression of (2).
Specifically, the method comprises the following steps: and 4, in the cyclic calculation of the step 4, only the time integral value, the average value and the emission limit value within one time of exceeding standard of the historical emission concentration of the pollutants are calculated, and the progress data and the like can not be calculated any more.
In the specific implementation process, when the data acquisition source is a data acquisition instrument and the real-time data is the minute mean value data, attention is paid to the meaning of acquiring the historical data: ciRepresents the average emission concentration at the i minute (period of time), (T)0,C0)…(Ti,Ci)…(Tn,Cn) The average value of n +1 minutes is obtained, the subsequent data calculation principle and method are basically the same as the steps 2, 3 and 4, but the calculation expression is obviously simplified, and the calculation frequency is one minute for the historical emission concentration integral according to minutes rather than seconds.
1) And calculating the time integral value of the pollutant emission concentration in the elapsed time period of the current hour.
2) And calculating the average value of the pollutant emission concentration in the elapsed time period of the current hour.
Z'a＝M'a/(n+1) (8)
3) And calculating the current hour emission schedule.
P'a＝100*M'a/(60*Bg) (9)
4) Calculation of current hourly time progress
P'b＝(n+1)/60 (10)
5) And calculating the real-time limit of the pollutant emission at the current hour.
6) And calculating the real-time concentration limit value of the emission within one time exceeding the standard in the current hour.
Claims (2)
1. A calculation method for a thermal power generating unit pollutant discharge standard real-time concentration limit value is characterized by comprising the following steps: the method comprises the following steps:
1) reading the current hour integral point T from the pollutant discharge real-time database0To the current time TnHistorical data of pollutant emission concentration in a time period, if no corresponding historical original data exists at an integral point time, linear difference value calculation is needed to obtain corresponding data at the integral point time, and n groups of historical data (T) of pollutant emission concentration are obtained0,C0)…(Ti,Ci)…(Tn,Cn) Wherein (T)i,Ci) Is shown at TiThe concentration of pollutant emission at the moment is CiWill TiThe second value of 3600 seconds corresponding to the time is recorded as SiAnd carrying out time weighted summation on the historical emission concentration of the pollutants,calculating to obtain a pollutant emission concentration time integral value M in the elapsed time period of the current houraAnd the average value Z of the pollutant emission concentrationa；
Time integral value M of pollutant emission concentrationaCalculating an expression:
wherein: ciThe unit is mg/m3，SiIs in seconds and is recorded as s, MaIn units of mg.s/m3；
Mean value of pollutant emission concentration ZaThe calculation expression of (1):
Za＝Ma/Sn(2)
wherein: snIs the current time TnCorresponding to the second value in 3600 seconds, the unit is s;
2) according to the time integral value M of pollutant emission concentrationaAnd standard value B of pollutant emission concentrationgCalculating the concentration discharge progress P of the pollutants at the current houraCalculating the elapsed time progress P of the current hourbDischarge progress P from the concentration of pollutants at the current houraMinus the elapsed time progress P of the current hourbObtaining a progress difference delta P;
the calculation expression of the pollutant concentration emission progress at the current hour is as follows:
Pa＝100*Ma/(3600*Bg) (3)
a computational expression of the current hour elapsed time progress:
Pb＝100*Sn/3600 (4)
3) according to the concentration discharge progress P of the pollutants at the current houraJudging whether the pollutant emission in the current hour exceeds the standard or not: such as PaIf the discharge rate is more than 100, judging that the pollutant discharge in the current hour exceeds the standard, and directly jumping to the step 4; such as PaLess than 100, the pollutant emission in the current hour does not exceed the standard, and the control distance B of the red line operation is pressed according to the set pollutant emission concentrationfCalculating the real-time pollutant emission concentration limit value Z in the remaining time period of the current hour1；
Real-time concentration limit for pollutant emissions Z1The calculation expression of (1):
4) the pollutant emission per hour exceeds the standard, if the pollutant emission per hour exceeds the standard and more than one time, P isaIf the hour is more than 200, the calculation of the hour is stopped; if the standard is exceeded and is within one time, the P is more than 100aIf the concentration is less than 200, the standard exceeding is required to be controlled within one time, otherwise, the power generation enterprises cannot enjoy the environment-friendly electricity price and still accept fine and be blamed for, and at the moment, the target value of the control is within one time of the standard exceeding, and the real-time concentration limit value Z of the emission within one time of the standard exceeding is required to be calculated2；
Real-time concentration limit Z of emissions within one time of exceeding standard2The calculation expression of (1):
2. the method for calculating the real-time concentration limit value of the pollutant of the thermal power generating unit reaching the standard according to claim 1, is characterized in that: support three major pollutants SO of thermal power generating unit2、NOxAnd dust calculation.
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