CN110501901A - The SCR spray ammonia required based on the accurate denitration of full load adjusts the method optimized - Google Patents
The SCR spray ammonia required based on the accurate denitration of full load adjusts the method optimized Download PDFInfo
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- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
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Abstract
The invention discloses a kind of methods that the SCR spray ammonia required based on the accurate denitration of full load adjusts optimization, the following steps are included: the change rate for exporting NOx parameter using boiler smoke tolerance, denitration SCR inlet NOx, denitration SCR obtains the basic value of spray ammonia flow as feed-forward signal；To spray ammonia flow as regulated quantity, eliminate anti-interference as regulated quantity bring to spray ammonia adjusting door aperture；It is established using the real value of the outlet SCR NOx as object and adjusts corrective loop, adjust ammonia spraying amount；Eliminate deviation between the outlet SCR NOx and neat stress NOx；Judgment basis is provided to spray ammonia flow measurement failure or SCR catalyst activity decline；Parameter shielding when increasing SCR system calibration and neat stress calibration cuts off function with circuit, to keep the normal work of regulating loop in calibration process.This method utilizes the original measuring point of station boiler SCR system, introduces spray ammonia flow misalignment correction, the outlet the SCR key functions such as NOx and neat stress NOx measurement deviation correction, joined judging automatically and no-harass switch strategy in NOx meter calibration process.
Description
Technical field
The invention belongs to coal-fired power generator set fields, and in particular to a kind of SCR spray required based on the accurate denitration of full load
Ammonia adjusts optimization method.
Background technique
SCR technology (SCR) is a treatment process for NOx, i.e., under the effect of the catalyst, spray
Enter reducing agent ammonia or urea, the NOx in tail gas is reduced into N2 and H2O.SCR technology (SCR) is also widely applied
In chemical industry boiler exhaust-gas treatment, effective denitration to exhaust gas is realized.
SCR technology in the prior art has the following problems: NOx and neat stress NOx numerical bias are big after SCR, spray ammonia tune
The problems such as NOx fluctuation is excessive during section system control lag, variable working condition or change coal quality, while being also not suitable with the ultralow row of unit
It puts, full load denitration, depth peak regulation etc. require.
Summary of the invention
To solve the above problems, the invention discloses a kind of SCR spray ammonia adjusting required based on the accurate denitration of full load is excellent
The method of change, this method utilize the original measuring point of station boiler SCR system, form using the outlet SCR NOx, neat stress NOx as regulated variable
Bunch grade adjustment circuit, based on chemical reaction equilibrium, with boiler smoke tolerance (boiler oil amount+total blast volume), denitration SCR inlet
The change rate that NOx, denitration SCR export the parameters such as NOx is feedforward amount, introduces spray ammonia flow misalignment correction, SCR exports NOx and net
The key functions such as flue gas NOx measurement deviation correction joined judging automatically and no-harass switch plan in NOx meter calibration process
Slightly.
In order to reach the goals above, the invention provides the following technical scheme:
A method of the SCR spray ammonia required based on the accurate denitration of full load adjusts optimization, comprises the following steps that:
The first step, the change rate with boiler smoke tolerance, denitration SCR inlet NOx, the outlet denitration SCR NOx parameter is feedforward letter
Number, it obtains the basic value of spray ammonia flow, adapts to the adjusting requirement of variable working condition；Wherein, boiler smoke tolerance is boiler oil amount and total
Air quantity；
Second step is eliminated to spray ammonia flow as regulated quantity and adjusts door aperture to spray ammonia and ask as regulated quantity bring is anti-interference
Topic；
Third step is established as object using the small hourly value of chimney neat stress NOx and adjusts major loop, examined with adapting to environmental protection index
Core requirement；
4th step is established as object using the real value of the outlet SCR NOx and adjusts corrective loop, quickly adjusted ammonia spraying amount, solve
The long problem of adjustment process delay time；
5th step exports the measurement time difference between NOx and neat stress NOx as foundation using SCR under different load, calculates SCR
The small hourly value of measured deviation between NOx and neat stress NOx is exported, the given value of amendment SCR outlet NOx solves the outlet SCR
The big problem of deviation between NOx and neat stress NOx；
6th step establishes performance correction circuit by object of the deviation between the setting value of neat stress NOx and actual value, solution
The adjusting deviation problem after ammonia flow misalignment is certainly sprayed, while spray ammonia flow measurement failure or SCR catalyst activity decline can be mentioned
For judgment basis；Parameter shielding when increasing SCR system calibration and neat stress calibration cuts off function with circuit, to keep calibrated
The normal work of regulating loop in journey.Due to there is deviation always between the outlet synchronization SCR NOx and neat stress NOx, measure
The time required for NOx measuring point to neat stress NOx measuring point is exported from SCR with one flue gas, difference is measured according to different load
Time utilizing the different time to show that SCR under different load exports the measurement time difference between NOx and neat stress NOx
Small hourly value is calculated divided by delay time after delay summation.
Preferably, based on NH3/NOx molar ratio is approximately equal to 1 principle when denitration reaction, according to boiler oil
Amount, air quantity and SCR inlet NOx parameter show that the basic value of spray ammonia flow, the basic value for spraying ammonia flow are calculated by following formula:
GNH3=Gfluegas×(NOxinlet-NOxsp)/22.4 x 17+Bias
In formula,
GNH3: spray the basic value of ammonia flow, kg/h.
Gfluegas: boiler dry flue gas amount (butt), Nm3/h.
NOxinlet: SCR import NOx actual value, ppm.
NOxsp: SCR exports NOx setting value, ppm.
Bias:SCR exports the amendment that NOx actual value deviates setting value, kg/h；Using auxiliary PD adjuster, to actual value
Operation is carried out with the difference of setting value, while auxiliary PD adjuster output area is defined.
Preferably, being introduced different negative using the change rate of boiler smoke tolerance (boiler oil amount+total blast volume) as feedforward amount
Chemical reaction delay factor under lotus, different inlet temperatures, improves spray ammonia accuracy, delay factor is entered in different load difference
Under mouth temperature conditions, the denitrating catalyst reaction time is different, and different delay times is set according to different operating conditions.
Preferably, introducing correlation using the change rate of NOx after NOx, denitration SCR before denitration SCR as feedforward amount and judging automatically
Circuit adjusts ammonia spraying amount in advance, improves spray ammonia accuracy, judges automatically circuit according to NOx, denitration SCR before denitration SCR
The situation of change of NOx is opened big in advance or is turned down for ammonia pitch afterwards.
Preferably, considering that the difference of the small hourly value of neat stress NOx and given value carries out PI operation, related misalignment correction is introduced
The accuracy of key index control is improved in circuit.
Preferably, after SCR there is the measurement time difference and measured deviation in NOx and neat stress NOx in view of under different load,
Related misalignment correction circuit is introduced, ammonia spraying amount is modified, due to exporting NOx measuring point and net cigarette by SCR with one flue gas
Always there is a time difference in the time of gas NOx measuring point, simultaneously because the Parameters variations such as humidity, oxygen amount existing for system itself are made
At measurement, there are deviations, so just making up the measurement time difference and measured deviation bring deficiency using small hourly value.
Preferably, considering the decline of spray ammonia flow measurement accuracy, NOx measuring point representativeness deficiency etc. after SCR under different load
Problem introduces related misalignment correction circuit, is modified to ammonia spraying amount.Since there may be flow surveys long afterwards for operation hours
Amount is inaccurate, under different load after the SCR of the same side NOx measuring point only one, can not really reflect being averaged for entire space
Value is not prevented from problems and causes to adjust misalignment, we introduce the deviation between setting value and actual value with neat stress NOx
For object, the small hourly value for choosing the two respectively is compared, the adjusting deviation after both solving the problems, such as spray ammonia flow misalignment in this way,
Simultaneously judgment basis can also be provided to spray ammonia flow measurement failure or SCR catalyst activity decline.
Further, it is contemplated that abnormal parameters fluctuate when NOx meter periodic calibrating, and introducing correlation is judged automatically cuts with unperturbed
Road is gained, spray ammonia accuracy is improved.To during the calibration of different meters, control loop can be switched to former control loop, such as:
When being demarcated to neat stress NOx measuring point, control loop can be switched to control SCR outlet NOx, avoided due to calibration
The fluctuation of period abnormal parameters causes control disorder.
The present invention has the advantage that
This method is accessed into the original flogic system of unit by SLC switching device, original logic is not changed；
Using chemical reaction equilibrium, NOx is not only realized in normal course of operation without discharge beyond standards, but also realize unit
Ammonia is sprayed in shutdown process to automatically engage with NOx without discharge beyond standards.
Utilize the parameters such as boiler smoke tolerance (boiler oil amount+total blast volume), denitration SCR inlet NOx, the outlet denitration SCR NOx
Change rate be feedforward amount, introduce spray ammonia flow misalignment correction, the outlet SCR NOx and neat stress NOx measurement deviation correction, reduction
Ammonia consumption avoids ammonium hydrogen sulfate deposition；
Compared with the existing technology, the invention has the following advantages:
Control function is strong, eliminates ammonia spraying amount caused by the operating conditions such as sudden load-changing, start and stop pulverized coal preparation system disturb substantially
Fluctuation and neat stress NOx are instantaneously exceeded；
Adjustable range is wide.The unit full load period can bringing normally into operation, SCR inlet NOx concentration 100mg/m3~
It can normal regulating within the scope of 500mg/m3；
It is high to control precision.It realizes and neat stress NOx is accurately controlled, deviation between the small hourly value of neat stress and setting value
No more than 1mg/m3, unit neat stress NOx realizes that small hourly value zero is exceeded；
It is good in economic efficiency, by the operation innovation work room independent research function, no expense expenditure, compared with INFIT control system
Save about 100,000 yuan of technological transformation expense；Excessive spray ammonia is eliminated by being precisely controlled, neat stress NOx control is relatively reliable, only subtracts
Few liquefied ammonia consumption (about 3%) one can save about 120,000 yuan of expense, on the other hand reduce the escaping of ammonia, alleviate ammonium hydrogen sulfate
In the deposition of SCR catalyst, air preheater, cigarette cooler etc., denitration SCR catalyst is run more than 8 years at present, but WGGH cigarette cooler
Resistance is only the 50% of design value, and air preheater resistance is only the 80% of design value, only reduction station service power consumption rate (about 0.03%) one
It can make a profit about 600,000 yuan.
Detailed description of the invention
Fig. 1, spray ammonia pitch control logic figure；
Fig. 2, denitration SCR NH3 SPOUT logic chart；
Fig. 3, denitration SCR pipeline difference compensation logic figure；
Fig. 4, neat stress NOX setting value and the small hourly value logic chart of actual value difference；
Fig. 5, SCR inlet dry flue gas mass flow calculation logic chart.
Wherein: 1, denitration SCR NH3SPA；2, theoretical consumption ammonia；3, denitration SCR COR FACT；4, denitration SCR
NH3SPOUT；, denitration SCR mixing ammonia flow；6, denitration SCR inlet dry flue gas mass flow；7, denitration SCR reactor inlet
NOx concentration；8, denitration SCR reactor outlet NOx concentration；9, chimney entrance NOx concentration setting value；10, denitration SCR pipeline difference
Compensation；11, denitration chimney entrance NOx concentration comes from FGD；12, the small hourly value of denitration SCR NOX AVR theory actual difference；13,
Boiler total blast volume；14, boiler oil amount.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the invention.
Embodiment 1, as Figure 1-Figure 5, a kind of SCR spray ammonia required based on the accurate denitration of full load adjust the side of optimization
Method comprises the following steps that:
The first step, the change rate with boiler smoke tolerance, denitration SCR inlet NOx, the outlet denitration SCR NOx parameter is feedforward letter
Number, it obtains the basic value of spray ammonia flow, adapts to the adjusting requirement of variable working condition；Wherein, boiler smoke tolerance is boiler oil amount and total
Air quantity；
Second step is eliminated to spray ammonia flow as regulated quantity and adjusts door aperture to spray ammonia and ask as regulated quantity bring is anti-interference
Topic；
Third step is established as object using the small hourly value of chimney neat stress NOx and adjusts major loop, examined with adapting to environmental protection index
Core requirement；
4th step is established as object using the real value of the outlet SCR NOx and adjusts corrective loop, quickly adjusted ammonia spraying amount, solve
The long problem of adjustment process delay time；
5th step exports the measurement time difference between NOx and neat stress NOx as foundation using SCR under different load, calculates SCR
The small hourly value of measured deviation between NOx and neat stress NOx is exported, the given value of amendment SCR outlet NOx solves the outlet SCR
The big problem of deviation between NOx and neat stress NOx；
6th step establishes performance correction circuit by object of the deviation between the setting value of neat stress NOx and actual value, solution
The adjusting deviation problem after ammonia flow misalignment is certainly sprayed, while spray ammonia flow measurement failure or SCR catalyst activity decline can be mentioned
For judgment basis；Parameter shielding when increasing SCR system calibration and neat stress calibration cuts off function with circuit, to keep calibrated
The normal work of regulating loop in journey.Due to there is deviation always between the outlet synchronization SCR NOx and neat stress NOx, measure
The time required for NOx measuring point to neat stress NOx measuring point is exported from SCR with one flue gas, difference is measured according to different load
Time utilizing the different time to show that SCR under different load exports the measurement time difference between NOx and neat stress NOx
Small hourly value is calculated divided by delay time after delay summation.
Based on NH3/NOx molar ratio is approximately equal to 1 principle when denitration reaction, according to boiler oil amount, air quantity and
SCR inlet NOx parameter show that the basic value of spray ammonia flow, the basic value for spraying ammonia flow are calculated by following formula:
GNH3=Gfluegas×(NOxinlet-NOxsp)/22.4 x 17+Bias
In formula,
GNH3: spray the basic value of ammonia flow, kg/h.
Gfluegas: boiler dry flue gas amount (butt), Nm3/h.
NOxinlet: SCR import NOx actual value, ppm.
NOxsp: SCR exports NOx setting value, ppm.
Bias:SCR exports the amendment that NOx actual value deviates setting value, kg/h；Using auxiliary PD adjuster, to actual value
Operation is carried out with the difference of setting value, while auxiliary PD adjuster output area is defined.
Using the change rate of boiler smoke tolerance (boiler oil amount+total blast volume) as feedforward amount, different load, different entrances are introduced
At a temperature of chemical reaction delay factor, improve spray ammonia accuracy, delay factor is in different load difference inlet temperature situation
Under, the denitrating catalyst reaction time is different, and different delay times is set according to different operating conditions.
Using the change rate of NOx after NOx, denitration SCR before denitration SCR as feedforward amount, introduces correlation and judge automatically circuit, to spray
Ammonia amount is adjusted in advance, is improved spray ammonia accuracy, is judged automatically circuit according to the change of NOx after NOx, denitration SCR before denitration SCR
Change situation to open big or turned down for ammonia pitch in advance.
Consider that the difference of the small hourly value of neat stress NOx and given value carries out PI operation, introduces related misalignment correction circuit, improve
The accuracy of key index control.
In view of under different load, NOx and neat stress NOx has the measurement time difference and measured deviation after SCR, related lose is introduced
Quasi- corrective loop, is modified ammonia spraying amount, due to one flue gas by SCR outlet NOx measuring point and neat stress NOx measuring point
Always there is a time difference in the time, simultaneously because the Parameters variations such as humidity, oxygen amount existing for system itself cause measurement to exist
Deviation, so just making up the measurement time difference and measured deviation bring deficiency using small hourly value.
Consider the problems such as NOx measuring point is representative insufficient after SCR under the decline of spray ammonia flow measurement accuracy, different load, introduces
Related misalignment correction circuit, is modified ammonia spraying amount.Since there may be flow measurements to be not allowed long afterwards for operation hours, no
With NOx measuring point after the same side SCR under load only one, can not really reflect the average value in entire space, be not prevented from
Problems cause to adjust misalignment, we introduce using the deviation between the setting value of neat stress NOx and actual value as object, point
Not Xuan Qu both small hourly value be compared, the adjusting deviation after both solving the problems, such as spray ammonia flow misalignment in this way while can also
Judgment basis is provided to spray ammonia flow measurement failure or SCR catalyst activity decline.
When in view of NOx meter periodic calibrating abnormal parameters fluctuate, introduce correlation judge automatically with no-harass switch circuit, mention
Height spray ammonia accuracy.To during the calibration of different meters, control loop can be switched to former control loop, such as: to net cigarette
When gas NOx measuring point is demarcated, control loop can be switched to control SCR outlet NOx, avoided due to parameter during calibration
Unusual fluctuations cause control disorder.
It is as shown in figure 1, figure 2, figure 3, figure 4 and figure 5 calculating logic figure of the invention.Boiler total blast volume (13) and boiler combustion
By denitration SCR inlet dry flue gas mass flow (6) is calculated after doses (14) addition；Chimney entrance NOx concentration setting value
(9) and denitration chimney entrance NOx concentration (11) from FGD subtract each other after respectively after different delay times summation take average meter
Calculation obtains the denitration SCR NOX small hourly value of AVR theory actual difference (12) then via controller output denitration SCR COR FACT
(3)；Since denitration SCR reactor outlet NOx concentration (8) and denitration chimney entrance NOx concentration (11) exist partially between FGD
Difference introduces boiler total blast volume (13) calculated function of time and calculates denitration SCR pipeline difference (10) compensation after being delayed；
With denitration SCR inlet dry flue gas mass flow (6), denitration SCR reactor inlet NOx concentration (7), denitration SCR reactor outlet
The change rate of NOx concentration (8) is that feedforward amount obtains denitration SCR NH3SPA (1) i.e. pitch opening degree instruction after PID arithmetic.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of method that the SCR spray ammonia required based on the accurate denitration of full load adjusts optimization, it is characterised in that: including following work
Skill step:
The first step, using boiler smoke tolerance, denitration SCR inlet NOx, denitration SCR outlet NOx parameter change rate as feed-forward signal,
Obtain the basic value of spray ammonia flow；Wherein, boiler smoke tolerance is boiler oil amount and total blast volume；
Second step is eliminated anti-interference as regulated quantity bring to spray ammonia adjusting door aperture using spraying ammonia flow as regulated quantity；
Third step is established as object using the small hourly value of chimney neat stress NOx and adjusts major loop；
4th step is established as object using the real value of the outlet SCR NOx and adjusts corrective loop, adjusts ammonia spraying amount；
5th step exports the measurement time difference between NOx and neat stress NOx as foundation using SCR under different load, calculates the outlet SCR
The small hourly value of measured deviation between NOx and neat stress NOx, amendment SCR outlet NOx given value, eliminate SCR outlet NOx with
Deviation between neat stress NOx；
6th step establishes performance correction circuit by object of the deviation between the setting value of neat stress NOx and actual value, to spray ammonia
Flow measurement failure or SCR catalyst activity decline provide judgment basis；Increase ginseng when SCR system calibration and neat stress calibration
Number shielding cuts off function with circuit, to keep the normal work of regulating loop in calibration process.
2. the method as described in claim 1, it is characterised in that: according to boiler oil amount, total blast volume and SCR inlet NOx parameter,
Show that the basic value of spray ammonia flow, the basic value for spraying ammonia flow are calculated by following formula:
GNH3=Gfluegas×(NOxinlet-NOxsp)/22.4x17+Bias
In formula,
GNH3: spray the basic value of ammonia flow, kg/h.
Gfluegas: boiler dry flue gas amount, butt, Nm3/h.
NOxinlet: SCR import NOx actual value, ppm.
NOxsp: SCR exports NOx setting value, ppm.
Bias:SCR exports the amendment that NOx actual value deviates setting value, kg/h；Using auxiliary PD adjuster, to actual value with set
The difference of definite value carries out operation, while being defined to auxiliary PD adjuster output area.
3. method according to claim 2, it is characterised in that: using the change rate of boiler smoke tolerance as feedforward amount, introduce different
Chemical reaction delay factor under load, different inlet temperatures, improves spray ammonia accuracy.
4. method as claimed in claim 2 or claim 3, it is characterised in that: with the change rate of NOx after NOx, denitration SCR before denitration SCR
For feedforward amount, introducing judges automatically circuit, is adjusted in advance to ammonia spraying amount, improves spray ammonia accuracy, judges automatically circuit root
It opens big according to the situation of change of NOx after NOx, denitration SCR before denitration SCR or is turned down for ammonia pitch in advance.
5. the method as described in claim 1, it is characterised in that: the difference of the small hourly value of neat stress NOx and given value carries out PI fortune
It calculates, introduces misalignment correction circuit.
6. the method as described in claim 1, it is characterised in that: according under different load, NOx and neat stress NOx exists after SCR
The time difference and measured deviation are measured, misalignment correction circuit is introduced, ammonia spraying amount is modified.
7. the method as described in claim 1, it is characterised in that: according to SCR under the decline of spray ammonia flow measurement accuracy, different load
NOx measuring point is representative insufficient afterwards, introduces misalignment correction circuit, is modified to ammonia spraying amount.
8. the method as described in claim 1, it is characterised in that: fluctuated, introduced according to abnormal parameters when NOx meter periodic calibrating
It judges automatically and no-harass switch circuit, raising spray ammonia accuracy.
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| CN113406282A (en) * | 2021-06-18 | 2021-09-17 | 国网安徽省电力有限公司电力科学研究院 | Power station boiler tail flue oxygen field calibration method |
| CN113457396A (en) * | 2021-06-29 | 2021-10-01 | 华能伊敏煤电有限责任公司 | Ammonia spraying automatic control method based on SCR denitration control system of thermal power plant |
| CN113457396B (en) * | 2021-06-29 | 2023-12-22 | 华能伊敏煤电有限责任公司 | Automatic ammonia spraying control method based on SCR denitration control system of thermal power plant |
| CN114632417A (en) * | 2022-03-17 | 2022-06-17 | 国能龙源环保有限公司 | Take accurate feedforward signal's denitration ammonia supply automatic regulating system |
| CN114904379A (en) * | 2022-04-06 | 2022-08-16 | 华光环保能源(西安)设计研究院有限公司 | Optimization method for automatic ammonia injection of denitration system of power station boiler |
| CN115155310A (en) * | 2022-07-13 | 2022-10-11 | 浙江大学 | Ammonia spraying accurate optimization method for SCR denitration system |
| CN115155310B (en) * | 2022-07-13 | 2024-04-26 | 浙江大学 | SCR denitration system ammonia spraying accurate optimization method |
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