CN107551774A - A kind of denitration control method and system for thermal power plant - Google Patents
A kind of denitration control method and system for thermal power plant Download PDFInfo
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- CN107551774A CN107551774A CN201710971838.9A CN201710971838A CN107551774A CN 107551774 A CN107551774 A CN 107551774A CN 201710971838 A CN201710971838 A CN 201710971838A CN 107551774 A CN107551774 A CN 107551774A
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Abstract
The invention discloses a kind of denitration control method and system for thermal power plant, the NO detected by CEMS at chimneyXConcentration value is discharged, calculates NOXThe integral point of discharge rate average per hour, then judge the integral point per hour average whether in default NOXDischarge in threshold range, if higher than default NOXThreshold value is discharged, then increases ammonia spraying amount, if less than default NOXThreshold value is discharged, then reduces ammonia spraying amount.NO relative to tradition according to dischargeXReal-time concentration value is controlled for ammonia spraying amount, no matter the present invention can be to discharge NOXReal-time concentration value is how many, as long as ensureing that average meets default NO to integral point per hourXDischarge threshold value can meet environmentally friendly appraisal standards, therefore NO is being effectively ensuredXOn the premise of discharge rate meets environmental requirement, ammonia spraying amount is accurately controlled, is occurred to avoid spraying the excessive or very few situation of ammonia, and then reduces the possibility that air preheater blocks, blower fan resistance is reduced and reduces the cost of overhaul.
Description
Technical field
The present invention relates to technical field of waste gas treatment, more particularly to a kind of denitration control method for thermal power plant
And system.
Background technology
Thermal power generation is still generation mode more important at present, but with the requirement to environmental protection, how to reduce pollution
The discharge of thing, while ensure the normal operation of steam power plant, it is the main demand for development of thermal power generation.
Existing denitration control mode, mainly detect NO in reactor outletX(nitrogen oxides), but environmental protection examination mark
Standard is with the CEMS of environmental administration at chimney (Continuous Emission Monitoring System：Fume emission is continuous
Monitoring system) measured by NOXIt is defined, the flue length between two measuring points is apart from each other, and there are many visual plants centre,
Such as economizer, electric cleaner, absorption tower etc., certain delay be present, belong to big inertial element.
Secondly environmental protection examination is NOXIntegral point average per hour, if passing through NOXReal-time amount controls ammonia spraying amount, easily surpasses
Adjust, cause spray ammonia excessive, generate a large amount of NH4HSO4Air preheater is blocked, deteriorates flue environment.
In addition content sampling in pre-existing reactors gateway is single-point sampling, can not represent the flow fields environment of whole flue,
Because flue flow field environment is complicated, because single-point sample position is different, the data of measurement have larger deviation, are unfavorable for denitration
Control.
Existing the escaping of ammonia measuring point uses oblique angle to the formula of wearing, the dead angle in flue gas flow field, and easily in start and stop process
It is middle to occur, to wearing position skew, to cause measuring point distortion, therefore, it is difficult to spray ammonia environment for characterizing because expanding with heat and contract with cold.
Therefore, ammonia spraying amount how is accurately controlled, and then ensures the stable operation of denitration device, is those skilled in the art's urgency
The technical problem that need to be solved.
The content of the invention
It is an object of the invention to provide a kind of denitration control method and system for thermal power plant, can effectively solve
The problems such as ammonia spraying amount control is inaccurate.
In order to solve the above technical problems, the invention provides following technical scheme：
A kind of denitration control method for thermal power plant, including：
Obtain the NO discharged after reacted device processingXRear NOXConcentration average, and according to the rear NOXConcentration mean control
Ammonia spraying amount；
Obtain the NO that CEMS is detected at chimneyXConcentration value is discharged, according to the NOXDischarge concentration value calculates NOXDischarge
The integral point of amount average per hour；
Judge whether average meets default NO to the integral point per hourXDischarge threshold value；
If it is higher than the default NOXThreshold value is discharged, then increases ammonia spraying amount；
If it is less than the default NOXThreshold value is discharged, then reduces ammonia spraying amount.
Preferably, it is described to obtain the NO discharged after reacted device processingXRear NOXConcentration average, is specifically included：
Set in the rear manifold of the reactor multiple along the equally distributed post-sampling point of its airflow direction；
Obtain the rear NO of each post-sampling pointXConcentration value；
According to the rear NOXConcentration value calculates the rear NOXConcentration average.
Preferably, described according to the rear NOXAfter concentration mean control ammonia spraying amount, in addition to：
Amount of ammonia slip is detected by reflective the escaping of ammonia detector in situ；
According to actual ammonia spraying amount and the amount of ammonia slip, the aperture of adjustment spray ammonia valve door.
Preferably, after amount of ammonia slip is detected by reflective the escaping of ammonia detector in situ, in addition to：
Judge whether the amount of ammonia slip exceedes default escape threshold value；
If so, then reduce the aperture of the spray ammonia valve door.
Preferably, before the aperture of the adjustment spray ammonia valve door, in addition to：
Obtain the NO before entering the reactor reactionXPreceding NOXConcentration average；
According to air quantity and coal amount and the preceding NOXConcentration average, calculate theoretical ammonia spraying amount；
According to the theoretical ammonia spraying amount, the actual ammonia spraying amount and the amount of ammonia slip, opening for the spray ammonia valve door is corrected
Degree.
Preferably, theoretical ammonia spraying amount is also calculated according to ature of coal simultaneously.
Preferably, the NO obtained before entering the reactor reactionXPreceding NOXConcentration average, including：
Set in the preceding manifold of the reactor multiple along the equally distributed preceding sampled point of its airflow direction；
Obtain the preceding NO of each preceding sampled pointXConcentration value；
According to the preceding NOXConcentration value calculates the preceding NOXConcentration average.
A kind of denitration control system for thermal power plant, including：
Integral point average acquisition device per hour, average acquisition device detects the integral point according to CEMS at chimney per hour
NOXConcentration value is discharged, calculates NOXThe integral point of discharge rate average per hour；
NOXConcentration average acquisition device and control device and ammonia-gas spraying device, the control device is according to the NOXConcentration
The rear NO discharged after the reacted device processing that average acquisition device is gotXConcentration average, the ammonia-gas spraying device is controlled to be sprayed
Ammonia, the control device are additionally operable to that average is higher than default NO per hour when the integral pointXWhen discharging threshold value, the spray ammonia dress is controlled
Put increase ammonia spraying amount；When the integral point, average is less than default NO per hourXWhen discharging threshold value, the ammonia-gas spraying device is controlled to reduce spray
Ammonia amount.
Preferably, the NOXConcentration average acquisition device be included in the reactor preceding manifold and after conflux mother
Along the equally distributed multiple NO of airflow direction in pipeXConcentration detection apparatus.
Preferably, in addition to for detecting the reflective the escaping of ammonia detector in situ of amount of ammonia slip.
Compared with prior art, above-mentioned technical proposal has advantages below：
A kind of denitration control method and system for thermal power plant provided by the present invention, by CEMS at chimney
The NO of detectionXConcentration value is discharged, calculates NOXThe integral point of discharge rate average per hour, then judges that average is the integral point per hour
It is no to be in default NOXDischarge in threshold range, if higher than default NOXThreshold value is discharged, then increases ammonia spraying amount, if less than default NOXRow
Go out threshold value, then reduce ammonia spraying amount.NO relative to tradition according to dischargeXReal-time concentration value is controlled for ammonia spraying amount, the present invention
No matter can be to discharge NOXReal-time concentration value is how many, as long as ensureing that average meets default NO to integral point per hourXDischarge threshold value, you can
Meet environmentally friendly appraisal standards, therefore NO is being effectively ensuredXOn the premise of discharge rate meets environmental requirement, spray ammonia is accurately controlled
Amount, occur to avoid spraying the excessive or very few situation of ammonia, and then reduce the possibility that air preheater blocks, reduce blower fan resistance and reduction
The cost of overhaul.
Brief description of the drawings
, below will be to embodiment or prior art in order to illustrate more clearly of technical scheme of the invention or of the prior art
The required accompanying drawing used is briefly described in description, it should be apparent that, drawings in the following description are some of the present invention
Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also be attached according to these
Figure obtains other accompanying drawings.
A kind of denitration control method for thermal power plant that Fig. 1 is provided for a kind of embodiment of the present invention
Schematic flow sheet；
A kind of denitration control system for thermal power plant that Fig. 2 is provided for a kind of embodiment of the present invention
Structural representation.
Embodiment
In order that the above objects, features and advantages of the present invention can become apparent it is understandable, below in conjunction with the accompanying drawings to this hair
Bright embodiment is described in detail.
Detail is elaborated in the following description in order to fully understand the present invention.But the present invention can with it is a variety of not
Other manner described here is same as to implement, those skilled in the art can do class in the case of without prejudice to intension of the present invention
Like popularization.Therefore the present invention is not limited by following public embodiment.
It refer to Fig. 1, a kind of denitration for thermal power plant that Fig. 1 is provided for a kind of embodiment of the present invention
The schematic flow sheet of control method.
A kind of embodiment of the present invention provides a kind of denitration control method for thermal power plant, including with
Lower step：
S100：Obtain the NO discharged after reacted device processingXRear NOXConcentration average, and according to rear NOXConcentration average control
Ammonia spraying amount processed.Because the flow fields environment of reactor inner flue is complex, by detecting the rear NO discharged after reacted device processingX
Concentration average, it can effectively control ammonia spraying amount.
S200：Obtain the NO that CEMS is detected at chimneyXConcentration value is discharged, according to NOXDischarge concentration value calculates NOXRow
The integral point of output average per hour.
Because environmental protection examination is with NOXAverage is standard to the integral point of discharge rate per hour, therefore by integral point per hour
Foundation of the average as spray ammonia control, can be effectively ensured NOXOn the premise of discharge rate meets environmental requirement, ammonia is reduced as far as possible
Gas demand.
S300：Judge whether average meets predetermined threshold value to integral point per hour.If it is not, then follow the steps below：
S400：If higher than default NOXThreshold value is discharged, then increases ammonia spraying amount.The aperture of ammonia valve door can be wherein sprayed by increasing
To improve ammonia spraying amount.
S401：If less than default NOXThreshold value is discharged, then reduces ammonia spraying amount.The aperture of ammonia valve door can be wherein sprayed by reducing
To reduce ammonia spraying amount.
By above-mentioned control method, ammonia spraying amount can be effectively controlled, is occurred to avoid spraying the excessive or very few situation of ammonia, and then
The possibility that air preheater blocks is reduced, blower fan resistance is reduced and reduces the cost of overhaul.
Further, the NO discharged after reacted device processing is obtainedXRear NOXConcentration average, specifically includes following steps：
Set in the rear manifold of reactor multiple along the equally distributed post-sampling point of its airflow direction.Wherein sample
The number of point can suitably be selected according to the specification of reactor.
Obtain the rear NO of each post-sampling pointXConcentration value.
According to rear NOXConcentration value calculates rear NOXConcentration average.
Further, according to NOXAfter concentration mean control ammonia spraying amount, in addition to：
Amount of ammonia slip is detected by reflective the escaping of ammonia detector in situ.Relative to traditional to wearing the detection of formula the escaping of ammonia
Instrument, it can effectively avoid the situation of the escaping of ammonia function caused by reactor expands with heat and contract with cold.
Ammonia spraying amount and amount of ammonia slip according to the actual requirements, the aperture of adjustment spray ammonia valve door.Due to can accurately obtain the escaping of ammonia
Amount, therefore can further improve the accurate control of ammonia spraying amount.
Secondly, it is further comprising the steps of after amount of ammonia slip is detected by reflective the escaping of ammonia detector in situ：
Judge whether amount of ammonia slip exceedes default escape threshold value, if so, then reducing the aperture of spray ammonia valve door.If the escaping of ammonia
Amount is excessive, then explanation spray ammonia is excessive, if spray ammonia excessively not only wastes, can also influence the normal operation of equipment.
In one embodiment of the invention, it is further comprising the steps of before the aperture of adjustment spray ammonia valve door：
Obtain the NO before entering reactor reactionXPreceding NOXConcentration average.
According to air quantity and coal amount and preceding NOXConcentration average, calculate theoretical ammonia spraying amount.It is understood that pass through reason
The aperture of spray ammonia valve door can be tentatively controlled by ammonia spraying amount, to avoid the hysteresis quality of denitration.
According to theoretical ammonia spraying amount, actual ammonia spraying amount and amount of ammonia slip, the aperture of amendment spray ammonia valve door.Ammonia valve is sprayed by correcting
The aperture of door, the precision of ammonia spraying amount can be effectively improved.
Further, when calculating theoretical ammonia spraying amount, can also be calculated simultaneously according to ature of coal.Due to coal quality not
Together, there is larger error when can cause to calculate theoretical ammonia spraying amount, therefore by introducing ature of coal parameter, ammonia spraying amount can be effectively improved
Precision.
A kind of embodiment of the present invention additionally provides a kind of denitration control system for thermal power plant, wraps
Include：Integral point average acquisition device 1 per hour, the integral point NO that average acquisition device 1 detects according to CEMS at chimney per hourXRow
Go out concentration value, calculate NOXThe integral point of discharge rate average per hour；NOx concentration average acquisition device 2 and control device 3 and
Ammonia-gas spraying device 4, the rear NO discharged after the reacted device processing that control device 3 is got according to NOx concentration average acquisition device 2X
Concentration average, control ammonia-gas spraying device 4 carry out spray ammonia, and control device 3 is additionally operable to that average is higher than default NO per hour when integral pointXDischarge
During threshold value, control ammonia-gas spraying device 4 increases ammonia spraying amount；When integral point, average is less than default NO per hourXWhen discharging threshold value, control spray ammonia
Device 4 reduces ammonia spraying amount.
In the present embodiment, due to reactor for treatment NOXThe NO discharged afterwardsXConcentration is not equally distributed, if passing through list
Point detection is difficult then the NO that accurate response goes out in flue gas ductXDistribution situation, therefore pass through rear NOXConcentration average controls spray ammonia
Amount, the accuracy of spray ammonia can be effectively improved.In addition, existing denitration control mainly passes through NOXThe instantaneous value of concentration sprays to adjust
Ammonia amount, easily there is the excessive situation of spray ammonia, even and if NOXThe instantaneous value of concentration meets emission request, but can not protect
Demonstrate,prove NOXAverage meets the standard of environmental protection examination to the integral point of discharge rate per hour, therefore is controlled by the denitration of the present embodiment offer
System, can by integral point per hour average be used as spray ammonia foundation, NO can be effectively ensuredXBefore discharge rate meets environmental requirement
Put, reduce ammonia demand as far as possible.
Further, NOx concentration average acquisition device 2 be included in reactor preceding manifold and rear manifold in edge
The equally distributed multiple NO of airflow directionXConcentration detection apparatus.It is provided with multiple NO in preceding manifoldXConcentration Testing
Device can detect the NO of its opposite positionXConcentration value, with this NOXConcentration value is come the preceding NO in manifold before calculatingXConcentration is equal
Value, passes through preceding NOXConcentration average can be used for the calculating of theoretical ammonia spraying amount；Next is arranged on multiple NO in rear manifoldXConcentration
Detection means can detect the NO of its opposite positionXConcentration value, with this NOXConcentration value is come the rear NO in manifold after calculatingXIt is dense
Average is spent, passes through rear NOXConcentration average can be used for the calculating of actual ammonia spraying amount.
Further, in addition to for detecting the reflective the escaping of ammonia detector in situ of amount of ammonia slip.Relative to tradition
To wearing formula the escaping of ammonia detector, can effectively avoid the situation of the escaping of ammonia function caused by reactor expands with heat and contract with cold.
It should also be noted that, herein, such as first and second or the like relational terms are used merely to one
Entity or operation make a distinction with another entity or operation, and not necessarily require or imply between these entities or operation
Any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant are intended to contain
Lid nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
- A kind of 1. denitration control method for thermal power plant, it is characterised in that including：NO is discharged after obtaining reacted device processingXRear NOXConcentration average, and according to the rear NOXConcentration mean control sprays ammonia Amount；Obtain the NO that CEMS is detected at chimneyXConcentration value is discharged, according to the NOXDischarge concentration value calculates NOXDischarge rate Integral point average per hour；Judge whether average meets default NO to the integral point per hourXDischarge threshold value；If it is higher than the default NOXThreshold value is discharged, then increases ammonia spraying amount；If it is less than the default NOXThreshold value is discharged, then reduces ammonia spraying amount.
- 2. denitration control method according to claim 1, it is characterised in that described to obtain what is discharged after reacted device is handled NOXRear NOXConcentration average, is specifically included：Set in the rear manifold of the reactor multiple along the equally distributed post-sampling point of its airflow direction；Obtain the rear NO of each post-sampling pointXConcentration value；According to the rear NOXConcentration value calculates the rear NOXConcentration average.
- 3. denitration control method according to claim 2, it is characterised in that described according to the rear NOXConcentration average control After ammonia spraying amount processed, in addition to：Amount of ammonia slip is detected by reflective the escaping of ammonia detector in situ；According to actual ammonia spraying amount and the amount of ammonia slip, the aperture of adjustment spray ammonia valve door.
- 4. denitration control method according to claim 3, it is characterised in that passing through reflective the escaping of ammonia detector in situ After detecting amount of ammonia slip, in addition to：Judge whether the amount of ammonia slip exceedes default escape threshold value；If so, then reduce the aperture of the spray ammonia valve door.
- 5. denitration control method according to claim 4, it is characterised in that it is described adjustment spray ammonia valve door aperture it Before, in addition to：Obtain the NO before entering the reactor reactionXPreceding NOXConcentration average；According to air quantity and coal amount and the preceding NOXConcentration average, calculate theoretical ammonia spraying amount；According to the theoretical ammonia spraying amount, the actual ammonia spraying amount and the amount of ammonia slip, the aperture for spraying ammonia valve door is corrected.
- 6. denitration control method according to claim 5, it is characterised in that theoretical spray ammonia is also calculated according to ature of coal simultaneously Amount.
- 7. denitration control method according to claim 6, it is characterised in that described to obtain into before the reactor reaction NOXPreceding NOXConcentration average, including：Set in the preceding manifold of the reactor multiple along the equally distributed preceding sampled point of its airflow direction；Obtain the preceding NO of each preceding sampled pointXConcentration value；According to the preceding NOXConcentration value calculates the preceding NOXConcentration average.
- A kind of 8. denitration control system for thermal power plant, it is characterised in that including：Integral point average acquisition device per hour, the integral point NO that average acquisition device detects according to CEMS at chimney per hourX Concentration value is discharged, calculates NOXThe integral point of discharge rate average per hour；NOXConcentration average acquisition device and control device and ammonia-gas spraying device, the control device is according to the NOXConcentration average The rear NOx concentration average discharged after the reacted device processing that acquisition device is got, controls the ammonia-gas spraying device to carry out spray ammonia, institute State control device and be additionally operable to that average is higher than default NO per hour when the integral pointXWhen discharging threshold value, the ammonia-gas spraying device is controlled to increase Big ammonia spraying amount；When the integral point, average is less than default NO per hourXWhen discharging threshold value, the ammonia-gas spraying device is controlled to reduce spray ammonia Amount.
- 9. denitration control system according to claim 8, it is characterised in that the NOXConcentration average acquisition device is included in Along the equally distributed multiple NO of airflow direction in the preceding manifold and rear manifold of the reactorXConcentration detection apparatus.
- 10. denitration control system according to claim 9, it is characterised in that also include being used for the original for detecting amount of ammonia slip The reflective the escaping of ammonia detector in position.
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| CN108187492A (en) * | 2018-01-17 | 2018-06-22 | 广东电网有限责任公司电力科学研究院 | A kind of spray ammonia control method and device |
| CN111437679A (en) * | 2020-04-07 | 2020-07-24 | 盐城摩因宝新材料有限公司 | Coal dust atmospheric particulate prevention and control dust fall and control dust control method and system |
| CN112774433A (en) * | 2020-12-31 | 2021-05-11 | 华能山东发电有限公司烟台发电厂 | Ammonia spraying control method and equipment for SCR system of thermal power plant |
| CN113069919A (en) * | 2021-04-27 | 2021-07-06 | 国能南京电力试验研究有限公司 | Method for calculating continuous hourly mean value of NOx concentration |
| CN113304609A (en) * | 2021-05-28 | 2021-08-27 | 上海明华电力科技有限公司 | Balance control method for thermal power generating unit denitration system |
| CN114063661A (en) * | 2021-04-27 | 2022-02-18 | 国能南京电力试验研究有限公司 | Method for calculating fixed value of NOx concentration control system at SCR denitration outlet |
| CN114063661B (en) * | 2021-04-27 | 2024-06-25 | 国能南京电力试验研究有限公司 | Method for calculating fixed value of SCR denitration outlet NOx concentration control system |
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| CN111437679A (en) * | 2020-04-07 | 2020-07-24 | 盐城摩因宝新材料有限公司 | Coal dust atmospheric particulate prevention and control dust fall and control dust control method and system |
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| CN113069919A (en) * | 2021-04-27 | 2021-07-06 | 国能南京电力试验研究有限公司 | Method for calculating continuous hourly mean value of NOx concentration |
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| CN114063661B (en) * | 2021-04-27 | 2024-06-25 | 国能南京电力试验研究有限公司 | Method for calculating fixed value of SCR denitration outlet NOx concentration control system |
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Application publication date: 20180109 |