CN106422709A - Ammonia spraying regulation automatic control method for denitrification system of thermal power plant - Google Patents
Ammonia spraying regulation automatic control method for denitrification system of thermal power plant Download PDFInfo
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- CN106422709A CN106422709A CN201610924200.5A CN201610924200A CN106422709A CN 106422709 A CN106422709 A CN 106422709A CN 201610924200 A CN201610924200 A CN 201610924200A CN 106422709 A CN106422709 A CN 106422709A
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- cems
- flue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides an ammonia spraying regulation automatic control method for a denitrification system of a thermal power plant. The method comprises the following steps of 1, using a DCS to conduct circular blowing control on sampling channels of CEMS (Continuous Emission Monitoring System) analyzers on an inlet and an outlet of each flue according to the number of flues of a same boiler; 2, acquiring the analysis values of the CEMS analyzers on the inlet and the outlet of the current flue in the process of blowing control, and adjusting the opening degree of an ammonia spraying door of the current flue according to a preset specific value relation; and 3, if the CEMS analyzers on the inlet and the outlet of the current flue are maintained or blown, replacing with the analysis values of CEMS analyzers on an inlet and an outlet of another flue. According to the provided CEMS analyzer blowing control method, the CEMS analyzers of the denitrification system can be automatically and orderly blown; besides, an automatic control strategy for ammonia spraying is designed for the blowing control method, and the blowing of the CEMS analyzers is controlled; and through the set logic switch, the ammonia spraying door is guaranteed to be constantly controllable, the undisturbed switching is guaranteed after blowing is finished, and the adjusting effect is improved.
Description
Technical field
The present invention relates to power field, the spray ammonia particularly to a kind of thermal power plant denitrating system adjusts and is not filled by flue analysis
Put the autocontrol method safeguarding impact.
Background technology
Under the requirement of energy-conserving and environment-protective, it is discharged flue gas and is required for processing through desulphurization denitration, denitration system for current thermal power plant
System is typically mounted at the inside of flue, is reacted with the nitre in flue gas by the ammonia spraying, and to reduce the nitre discharged in flue gas and to contain
Amount.The number of wherein ammonia spraying amount, is to be automatically adjusted according to the sulphur nitre content in flue gas by DCS system, and the nitre in flue gas contains
Amount is then mounted in flue entrance and the CEMS analyzer in exit obtains.
Existing CEMS analyzer needs to be serviced in use for some time, also will be to the sampling of analyzer after maintenance
Pipeline is purged, and cannot obtain the sulphur nitre content in flue gas in maintenance and purging.
The regulation of the spray ammonia door to denitrating system for the existing DCS is in the following way：CEMS analysis using flue afterbody
The data of instrument determining that in the flue gas of discharge, amount containing nitre is whether in predetermined value, tunes up if the deviation from predetermined value is then suitable
Or turn the folding amount spraying ammonia door down, therefore, once CEMS analyzer safeguards or purging all can affect the control to spray ammonia door for the DCS
System.
Additionally, the flue of an existing boiler is divided into A, B two, the entrance and exit of every flue is separately installed with CEMS
Analyzer, is automatically controlled by the purge time and order of the CEMS analyzer to each flue for the DCS, when CEMS analyzer occurs
When fault needs manual maintenance, attendant can restart to the purging program of current CEMS analyzer, now,
The purging of CEMS analyzer is set and will be conflicted with the formation that automatically controls of DCS, leads to DCS to report to the police.
Content of the invention
The invention aims to providing a kind of spray ammonia regulation of thermal power plant denitrating system not safeguarded by flue analytical equipment
The autocontrol method of impact.
Especially, the invention provides a kind of spray ammonia of thermal power plant denitrating system adjusts autocontrol method, including as follows
Step：
Step 100, DCS is according to the flue quantity of same boiler, the CEMS analyzer at each chimney intake and exit
Sampling passage be circulated purging control；
Step 200, purging control in, obtain current chimney intake at and exit CEMS analyzer assay value, and
According to ratio relation set in advance, adjust the spray ammonia door aperture of current flue；
At step 300, such as current chimney intake or exit CEMS analyzer is being safeguarded or purged, then take other flues
The assay value of entrance or exit CEMS analyzer is substituted.
Preferably, in described step 100, such as the CEMS analyzer at current import or export is being safeguarded or is being purged,
Then skip, the purging being directly entered CEMS analyzer at next import or export controls.
Preferably, in described step 100, in cycle purge control process, automatically reset alternate manner and CEMS is analyzed
The purging of instrument sets.
Preferably, in described step 300, when taking the assay value of CEMS analyzer at other flue outlets, with reference to
The currently load value of whole unit, and sued for peace with the assay value of this load value and this exit CEMS analyzer, as it
The assay value of its exit CEMS analyzer.
Preferably, in described step 300, such as at current chimney intake or exit CEMS analyzer purges, can be straight
Connect with the load value of current unit after treatment, as the assay value of this entrance or exit CEMS analyzer.
Preferably, to load value before processing, the increase and decrease first current loads value being carried out in the scheduled time calculates, then will
Result after this load value and increase and decrease calculating exports after being sued for peace.
Preferably, the CEMS analyzer at each flue outlet is provided with setting value, and this setting value is fume emission to big
Standard compliant setting during gas, just needs adjustment spray ammonia door aperture when assay value has difference with this setting value.
Preferably, when the flue quantity of same boiler is more than one, cycle purge control mode is：The entering of current flue
The loop control mode successively of the inlet-outlet of mouth-outlet-other flues.
Preferably, when the flue quantity of same boiler is more than one, cycle purge control mode is；The entering of same flue
The control mode of mouth-outlet independent loops.
Preferably, DCS is as follows to the purging control process of every CEMS analyzer：
Step 101, judges current CEMS analyzer whether fault；
Step 102, does not have fault then to execute purging program to it, if faulty, jumps directly to step 104, if
Purge, after being connected to the signal that purging completes, terminate the current program that purges and enter next step；
Step 103, purging completes and sends corresponding signal, after receipt signal, the time delay of the execution scheduled time；
Step 104, time delay reaches, and the purging carrying out next CEMS analyzer controls.
The CEMS analyzer purging control method that the present invention provides, the automatic order of achievable denitrating system CEMS analyzer
Purging, is simultaneous for this purging control method, devises the spray automatic control strategy of ammonia, the purging of CEMS analyzer is controlled
System, by set logic switch it is ensured that spray ammonia door constantly controlled and purging terminate after no-harass switch, improve adjust effect
Really.
Brief description
Fig. 1 is that the spray ammonia according to one embodiment of the present invention adjusts autocontrol method schematic flow sheet；
Fig. 2 is the Multi-flue circulation controlling means schematic flow sheet according to one embodiment of the present invention；
Fig. 3 is each flue independent loops control method schematic flow sheet according to one embodiment of the present invention；
Fig. 4 is to seem control flow schematic diagram according to every blowing of a CEMS analyzer of one embodiment of the present invention；
Fig. 5 is the schematic flow sheet according to one embodiment of the present invention using other flue assay values；
Fig. 6 is the schematic flow sheet of the employing unit load according to one embodiment of the present invention.
Specific embodiment
Denitrating system is to spray into ammonia into flue, by the NO in flue gasxIt is reduced to nitrogen and water, thus reducing to big
The pollution of gas, the ammonia amount therefore spraying into affects the treatment effect of flue gas.
The DCS of thermal power plant passes through to the NO in the flue gas entering fluexIt is analyzed, and in the flue gas of flue outlet
NOxAnalysis, to determine the ammonia amount that current flue gas needs.As the NO according to chimney intake firstxContent can just successive step spray ammonia
The aperture of door, ammonia amount now is an ammonia amount that disclosure satisfy that reduction requires in theory, further according to the NO at flue outletxContain
Measure it may be determined that whether the ammonia amount currently spraying into achieves reduction purpose, if the NO in flue gasxContent exceeds discharge standard,
Or the scope less than discharge standard, then spray ammonia door is finely adjusted, suitable decreases or increases ammonia spraying amount.
NOxContent realized by CEMS analyzer, this CEMS analyzer is pacified respectively in the outlet of flue and entrance
Fill one, flue gas is introduced by exhaust gases passes by it, be then analyzed, after long-time use, cigarette in exhaust gases passes, can be piled up
Dirt, now, is accomplished by exhaust gases passes are purged at set intervals, and during purging, CEMS analyzer cannot enter
Row work, DCS also just cannot obtain respective value, leads to the fume emission under this state uncontrollable.
In addition, the purging program of general CEMS analyzer can be executed by its own it is also possible to quote control by DCS
System, it is according to predetermined purging interval that DCS quotes control, controls each CEMS analyzer execution purging program.Once CEMS divides
Analyzer breaks down, and operating personnel can be safeguarded in time, after the completion of maintenance, then needs its exhaust gases passes is purged, this
When, the purging that operating personnel press controls, and its time is to be defined by now, again presses interval time execution, such setting
Can produce with the control of DCS and conflict, that is, the purging interval upsetting DCS sets, and leads to the warning that takes place frequently.
The present invention is the solution proposing on the basis of the above, is in control all the time with the discharge standard ensureing flue gas
In.
As shown in figure 1, the spray ammonia of thermal power plant's denitrating system of one embodiment of the present invention adjusts autocontrol method one
As property ground comprise the steps：
Step 100, DCS is according to the flue quantity of same boiler, the CEMS analyzer at each chimney intake and exit
Sampling passage be circulated purging control.
In this step, when the flue quantity of same boiler is more than one, cycle purge control mode is：Current flue
The loop control mode successively of the inlet-outlet of inlet-outlet-other flue.I.e. the quantity according to flue control successively each
Individual CEMS analyzer, this is the control mode all over wheel.
As shown in Fig. 2 DCS controls the CEMS analyzer of A side chimney intake first, the CEMS of A side flue outlet is controlled to divide
Analyzer, then remove to control the CEMS analyzer of B side-entrance, the CEMS analyzer of B side outlet, then return again to control A side flue
The CEMS analyzer of import, circulates like this.
Another kind of control mode is：When the flue quantity of same boiler is more than one, the inlet-outlet of same flue is independent
The control mode of circulation.I.e. two flues are separate, each self-loopa respectively.
As shown in figure 3, DCS controls the CEMS analyzer of A side-entrance and the CEMS analyzer of outlet to circulate control back and forth simultaneously
System, and the CEMS analyzer loop control back and forth of the CEMS analyzer of B side-entrance and outlet.
In above two control mode, the structure of the twice flue of same boiler is just the same.In entering of per pass flue
It is separately installed with CEMS analyzer with exit, the spray ammonia door of twice flue is completely independent at mouthful.
For impact CEMS analyzer work purging program, DCS to current CEMS analyzer execution purging program before,
First the state of this CEMS analyzer is analyzed, such as it is being safeguarded or is purging, then directly skip this CEMS analyzer, directly
The purging entering next CEMS analyzer controls.
Additionally, DCS is when skipping this CEMS analyzer, automatically resets alternate manner and the purging of CEMS analyzer set,
The purging programmable interval time resetting this CEMS analyzer is so as to consistent with DCS.By this process it is ensured that DCS is controlled
The uniqueness of system, thus eliminate purge conflicting between controlling because of the artificial purging setting CEMS analyzer with DCS.
Step 200, purging control in, obtain current chimney intake at and exit CEMS analyzer assay value, and
According to ratio relation set in advance, adjust the spray ammonia door aperture of current flue.
This step is the normal processing steps of adjustment spray ammonia door, and this state is all CEMS analyzers all in normal condition
Under adjustment process, the mode of adjustment with aforementioned adjustment explanation consistent.
CEMS analyzer at each flue outlet is provided with setting value, and this setting value is that fume emission accords with to during air
The setting of standardization, just needs adjustment spray ammonia door aperture when assay value has difference with this setting value.
At step 300, such as current chimney intake or exit CEMS analyzer is being safeguarded or purged, then take other flues
The assay value of entrance or exit CEMS analyzer is substituted.
This step is the spray ammonia door adjustment side of this flue for solving when CEMS analyzer is in maintenance or malfunction
Formula.The Gas Parameters that the twice flue of same boiler passes through are likewise, therefore, at the CEMS analyzer of wherein one flue
The assay value of the CEMS analyzer at another road flue same location when maintenance or malfunction, can be quoted.
The key parameter of the denitrating system of present embodiment is ammonia spraying amount, therefore adopts good control measure to spray ammonia door
Being controlled is the automatic emphasis of denitration, and CEMS analyzer purging not only decreases the effective time of CEMS analyzer measurement, special
It is not cannot to realize normally measuring in real time during purging, lead to denitration ammonia spraying amount to be at this moment nearly in no-console condition.This enforcement
The CEMS analyzer purging control method that mode provides, the automatic order purging of achievable denitrating system CEMS analyzer, simultaneously
For this purging control method, devise the spray automatic control strategy of ammonia, the purging of CEMS analyzer is controlled, by setting
Fixed logic switch it is ensured that spray ammonia door constantly controlled and purging terminate after no-harass switch, improve regulating effect.
Further, when taking the assay value of CEMS analyzer at other flue outlets, can be with reference to currently whole
The load value of unit, and sued for peace with the assay value of this load value and this exit CEMS analyzer, as other exits
The assay value of CEMS analyzer.The load value of current unit represents current boiler working condition, and that is, load value is big, shows boiler
Output is high, now, NO in flue gasxContent is also big, and equally, load value is little, shows that boiler exports low, the NO of flue gasxContent
Little.Therefore, the load value of unit is also NO in impact flue gasxOne key value of content.Consider the load value changes of unit, also
The aperture of spray ammonia door can be adjusted in advance, the flue gas change gradually increasing to adapt to or being gradually reduced.
In another embodiment example, such as at current chimney intake or exit CEMS analyzer purges, not
In the case of considering other flues, can directly with the load value of current unit after treatment, as this entrance or exit
The assay value of CEMS analyzer.The manner is a kind of rough adjustment mode, is based on load variations and the NO of unitxContain
The corresponding relation of amount, so that it is determined that currently what aperture spray ammonia door should adjust to.The manner is adapted to only boiler and only has one
Road flue, or the situation that the CEMS analyzer of twice flue same position breaks down simultaneously.
Further, in an embodiment of the invention, in the load value before processing to unit, can be first to current
The increase and decrease that load value was carried out in the scheduled time calculates, then this load value is sued for peace with the result after increase and decrease calculating
After export.It is according to the change in a period of time of load value that increase and decrease calculates, and confirms that it is in propradation, or
It is in decline state, thus providing lead when determining the aperture of spray ammonia door.
As shown in figure 4, in an embodiment of the invention, the purging control process to every CEMS analyzer for the DCS
As follows：
Step 101, judges current CEMS analyzer whether fault；
Step 102, does not have fault then to execute purging program to it, if faulty, jumps directly to step 104, if
Purge, after being connected to the signal that purging completes, terminate the current program that purges and enter next step；
Step 103, purging completes and sends corresponding signal, after receipt signal, the time delay of the execution scheduled time；
Step 104, time delay reaches, and the purging carrying out next CEMS analyzer controls.
In the present embodiment, DCS is when controlling CEMS analyzer, may current CEMS analyzer safeguarding or
Purging, if safeguarding, then can only skip current CEMS analyzer；If purging, then can wait, as this CEMS
After the completion of analyzer purging, can send, to DCS, the signal that purging completes, after being connected to this signal, DCS can take over this CEMS analyzer
Purging control.
Provide the aperture adjustment embodiment of spray ammonia door below in conjunction with foregoing teachings.
Embodiment 1：Control method using the assay value of another flue CEMS analyzer.
As shown in figure 5, the CEMS analyzer as current A side outlet is working properly, then directly adopt its assay value.As current
The CEMS analyzer fault of A side outlet or purging, then adopt the assay value of B side outlet CEMS analyzer, this value is by B side
Outlet NOxActual value and NOxSetting value obtains after PID process, and the value after obtaining carries out phase add operation with unit load again,
NO with A side entrance CEMS analyzer afterwardsxAssay value carries out phase add operation, if A side entrance CEMS analyzer safeguarding or
Blow and seem, then directly adopt the assay value of B side entrance CEMS analyzer.Go manually or automatically to adjust according to result obtained above
The spray ammonia door aperture of whole A side flue.
In addition, the spray ammonia door aperture method of adjustment of B side flue is identical with the method.
Embodiment 2：Do not adopt the control method of the assay value of another flue CEMS analyzer.
As shown in fig. 6, the CEMS analyzer as current A side outlet is normal, then directly adopt its assay value.As current A side
The CEMS analyzer fault of outlet or purging, then adopt unit load value, this load value includes the current actual negative of unit
Charge values, and the load value through raising or delayed process, after two values are added, then are exported through predetermined function process.With
When, such as the CEMS analyzer of A side-entrance is normal, then defeated after being directly added with the assay value of A side outlet using its assay value
Go out, otherwise consider the load value of current unit, the process to unit load value is consistent with A side outlet.Assay value after addition
Manually or automatically go to adjust the spray ammonia door aperture of A side flue.
In addition, the spray ammonia door aperture method of adjustment of B side flue is identical with the method.
So far, although those skilled in the art will appreciate that detailed herein illustrate and describe the multiple of the present invention and show
Example property embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure
Determine or derive other variations or modifications of many meeting the principle of the invention.Therefore, the scope of the present invention is it is understood that and recognize
It is set to and cover other variations or modifications all these.
Claims (10)
1. the spray ammonia of thermal power plant's denitrating system adjusts autocontrol method it is characterised in that comprising the steps：
Step 100, DCS according to the flue quantity of same boiler, to taking of the CEMS analyzer at each chimney intake and exit
Sample passage is circulated purging control；
Step 200, purging control in, obtain current chimney intake at and exit CEMS analyzer assay value, and according to
Ratio relation set in advance, adjusts the spray ammonia door aperture of current flue；
At step 300, such as current chimney intake or exit CEMS analyzer is being safeguarded or purged, then take other chimney intakes
The assay value of place or exit CEMS analyzer is substituted.
2. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
In described step 100, such as the CEMS analyzer at current import or export is being safeguarded or is being purged, then skip, directly
The purging entering CEMS analyzer at next import or export controls.
3. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
In described step 100, in cycle purge control process, automatically reset alternate manner and the purging of CEMS analyzer is set
Fixed.
4. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
In described step 300, when taking the assay value of CEMS analyzer at other flue outlets, with reference to currently whole unit
Load value, and sued for peace with the assay value of this load value and this exit CEMS analyzer, as other exit CEMS
The assay value of analyzer.
5. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
In described step 300, such as at current chimney intake or exit CEMS analyzer purges, can be directly with current unit
Load value after treatment, as the assay value of this entrance or exit CEMS analyzer.
6. according to claim 5 spray ammonia adjust autocontrol method it is characterised in that
To load value before processing, the increase and decrease first current loads value being carried out in the scheduled time calculates, then by this load value with
Result after increase and decrease calculating exports after being sued for peace.
7. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
CEMS analyzer at each flue outlet is provided with setting value, this setting value be fume emission to air when meet standard
Setting, just need adjustment to spray ammonia door aperture when assay value and this setting value have difference.
8. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
When the flue quantity of same boiler is more than one, cycle purge control mode is：Inlet-outlet-other of current flue
The loop control mode successively of the inlet-outlet of flue.
9. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
When the flue quantity of same boiler is more than one, cycle purge control mode is；The inlet-outlet of same flue independently follows
The control mode of ring.
10. according to claim 1 spray ammonia adjust autocontrol method it is characterised in that
DCS is as follows to the purging control process of every CEMS analyzer：
Step 101, judges current CEMS analyzer whether fault；
Step 102, does not have fault then to execute purging program to it, if faulty, jumps directly to step 104, if
Purging, then after being connected to the signal that purging completes, terminates the current program that purges and enters next step；
Step 103, purging completes and sends corresponding signal, after receipt signal, the time delay of the execution scheduled time；
Step 104, time delay reaches, and the purging carrying out next CEMS analyzer controls.
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Cited By (11)
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|---|---|---|---|---|
| CN106731829A (en) * | 2017-03-31 | 2017-05-31 | 华北电力大学（保定） | Suppress control system and method for the purging on thermal power plant's discharged nitrous oxides influence |
| CN107551774A (en) * | 2017-10-18 | 2018-01-09 | 华润电力湖北有限公司 | A kind of denitration control method and system for thermal power plant |
| CN107803114A (en) * | 2017-12-04 | 2018-03-16 | 烟台龙源电力技术股份有限公司 | A kind of denitration control system and its control method and control device |
| CN108816043A (en) * | 2018-06-07 | 2018-11-16 | 大唐韩城第二发电有限责任公司 | A kind of denitration device and its autocontrol method |
| CN108970394A (en) * | 2018-07-23 | 2018-12-11 | 北京能源集团有限责任公司 | A kind of thermal power plant's SCR system optimization spray ammonia method and system |
| CN112162530A (en) * | 2020-08-25 | 2021-01-01 | 嘉兴新嘉爱斯热电有限公司 | Control system and method for CMES (China Mobile communications System) blowing system |
| CN112221323A (en) * | 2020-08-11 | 2021-01-15 | 华电电力科学研究院有限公司 | NOx partition measuring method based on flow velocity weighting |
| CN113274878A (en) * | 2021-04-07 | 2021-08-20 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Thermal power plant denitration outlet nitrogen oxide standard exceeding phenomenon control method |
| CN113433980A (en) * | 2021-04-27 | 2021-09-24 | 国能南京电力试验研究有限公司 | Calculating denitration inlet NO under blowing working condition by system error methodxMethod for measuring values |
| CN114870583A (en) * | 2022-04-28 | 2022-08-09 | 山东电力工程咨询院有限公司 | All-condition denitration control system and method based on ammonia escape monitoring |
| CN117379944A (en) * | 2023-10-16 | 2024-01-12 | 国能龙源环保有限公司 | Method, device, equipment and medium for controlling emission of clean flue gas sulfur dioxide |
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