CN109464890A - One kind being based on tandem variable element denitration autocontrol method - Google Patents
One kind being based on tandem variable element denitration autocontrol method Download PDFInfo
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- CN109464890A CN109464890A CN201811241390.6A CN201811241390A CN109464890A CN 109464890 A CN109464890 A CN 109464890A CN 201811241390 A CN201811241390 A CN 201811241390A CN 109464890 A CN109464890 A CN 109464890A
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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Abstract
The present invention provides a kind of based on tandem variable element denitration autocontrol method, comprising the following steps: adjusts reactor outlet NOx standard state value, the variable quantity of required ammonia flow is calculated by the difference of reactor outlet NOx setting value and measured value；Adjust sprayed ammonia flow, utilize ammonia nitrogen molar ratio principle, control system calculates ammonia flow according to current flue gas flow, SCR inlet NOx concentration and setting ammonia nitrogen molar ratio computing, then the setting value adjusted plus the variable quantity of the calculated ammonia flow of homophony as pair, ammonia flow setting value and practical ammonia flow difference calculate valve opening, pair is adjusted to coarse adjustment, the variation of quick response entrance NOx variation and flue gas flow；CEMS instrument automatic Calibration；It sprays ammonia automatic control loop and safety measure is set；Corresponding spray ammonia regulating valve is forcibly closed when reactor tripping, flue-gas temperature are lower than 300 DEG C or spray ammonia shut-off valve has closed.It solves denitration reaction system and has large time delay, there are the characteristics such as self-balancing to influence to control system bring.
Description
Technical field
The invention belongs to denitration automatic control technology fields, and in particular to one kind is automatically controlled based on the denitration of tandem variable element
Method.
Background technique
Large capacity fired power generating unit uses SCR denitration device substantially at present, and automatic input rate and investment effect are undesirable, single
Loop control strategy does not adapt to denitrating system spray ammonia, SCR reacts, the entire control system of variation of outlet NOx has delay, big
The characteristics such as lag.It has the following problems:
One, entire control system anti-interference is poor, causes inlet NOx concentration, flue gas flow disturbance in load fluctuation, will be to whole
A control system brings very big disturbance, and chimney entrance NOx is exceeded；
Two, single loop control system, PID adjusting over control is serious, and reactor outlet the escaping of ammonia is bigger than normal, and ammonia consumption is high, increases fortune
Row cost, and the ammonia escaped generates hydrogen sulfate ammonia with SO3 in air preheater, since hydrogen sulfate ammonia physical property is relatively viscous, adsorbs cigarette
Dust in gas is attached on air preheater heat exchanger plates, air preheater is caused to block, and seriously affects the normal operation of unit；
Three, Single Loop Control System parameter is simple and is definite value, does not adapt to the variation of operating condition and the disturbance of system, PID is always
It is in adjustment state, actuator acts frequently, and increases the failure rate and equipment deficiency rate of actuator, and that shortens actuator uses the longevity
Life；
Four, denitration CEMS system gas analyzer is easy to appear null offset, in order to guarantee analyzer zero point accuracy, analysis
Instrument carries out automatic Calibration to zero point using air every two hours, and the automatic Calibration time is 10min, during this period analysis meter
The measurement of parameter is maintained at value before calibration, and instrument shows that NOx value can not react the variation of NOx in practical flue gas, NOx at this time
It participates in reconciling no practical significance, there are deviations for instrument recovery normal measurements and instrument retention value after automatic Calibration, draw
Play control system disturbance.
Summary of the invention
The present invention provides one kind based on tandem variable element denitration autocontrol method, makes denitration automatic input rate and investment effect
Fruit is significantly improved, and is reduced operations staff's workload, is reduced the escaping of ammonia, ensure that air preheater imports and exports differential pressure.
The technical scheme is that a kind of be based on tandem variable element denitration autocontrol method, comprising the following steps:
1) reactor outlet NOx standard state value is adjusted, needed for calculating by the difference of reactor outlet NOx setting value and measured value
The variable quantity of ammonia flow；
2) sprayed ammonia flow is adjusted, using ammonia nitrogen molar ratio principle, control system is according to current flue gas flow, SCR
Entrance NOx concentration and setting ammonia nitrogen molar ratio computing calculate ammonia flow, then add the variation of the calculated ammonia flow of homophony
The setting value adjusted as pair is measured, ammonia flow setting value and practical ammonia flow difference calculate valve opening, and pair is adjusted to coarse adjustment,
The variation of quick response entrance NOx variation and flue gas flow；
3) CEMS instrument automatic Calibration, two hours of the every mistake of system carry out automatic Calibration using zero-bit of the air to analysis meter,
The automatic Calibration time is 10min, and the measurement of analysis meter parameter is maintained at value before calibration during this period；
4) safety measure is arranged in spray ammonia automatic control loop；
5) corresponding spray ammonia is forcibly closed when reactor tripping, flue-gas temperature are lower than 300 DEG C or spray ammonia shut-off valve has closed to adjust
Valve.
Scheme further, in the step 1) reactor outlet NOx setting value 20mg/Nm3~40mg/Nm3 it
Between, when setting reactor outlet NOx and its setting value deviation as e mg/Nm3 , ∣ e ∣ > 8mg/Nm3, proportional band 200, when integral
Between 250, regulator parameter is strong, reduces deviation as early as possible；When 4mg/Nm3 < ∣ e ∣ < 8mg/Nm3, proportional band 260, the time of integration
350, adjuster ginseng is relatively weak, is normally adjusted；When ∣ e ∣ < 4mg/Nm3, proportional band 360, the time of integration 450, adjuster ginseng
Number is very weak, maintains ammonia flow, makes SCR fully reacting, system autobalance.
Further, meter calibration is that denitration A, B side reaction device 4 block analysis instrument of entrance are automatic to scheme in the step 3)
Setting difference half an hour time of calibration, when the side entrance A analyzer automatic Calibration, the side entrance A NOx is according to the side entrance B NOx
Variation records the side entrance A NOx and the side entrance B NOx ratio value before automatic Calibration, in the side entrance A analyzer automatic Calibration to adjust
When, the side entrance A NOX is equal to record ratio multiplied by the side entrance B NOx ratio value, can also react the true side entrance A NOx variation in this way；
When entrance analyzer automatic Calibration, outlet NOx is adjusted according to changing with side entrance NOx, is gone out before recording automatic Calibration
Mouthful NOx with side entrance NOx ratio value, in exit analysis instrument automatic Calibration, outlet NOx be equal to record ratio multiplied by it is ipsilateral enter
Mouth NOx can also react true outlet NOx variation in this way.
Further, the safety measure in the step 4) includes: scheme
1, when exit NOx concentration is greater than 45mg/Nm3, locking is closed instruction by the manual operator of executing agency；
2, setting spray ammonia regulating valve instructs the upper limit 90%, lower limit 10%.Integral saturation in order to prevent, secondary controller export the upper limit 90%,
Lower limit 10%, master selector exports upper limit 88t/h, lower limit 20t/h, when valve is opened to 90%, ammonia flow 88t/h, valve open to
When 10%, ammonia flow 20t/h；
3, rationally setting regulating valve cuts manual condition, any condition triggering, and regulating valve is switched to manually simultaneously soft light word warning reminding fortune
Administrative staff.
Scheme further, the reasonable setting regulating valve and manual condition is:
A, reactor inlet NOx bad point；
B, reactor outlet NOx bad point；
C, ammonia flow bad point；
D, regulating valve instruction is greater than 10% with feedback deviation value；
E, it exports NOx setting value and measured value deviation is greater than 25mg/Nm3；
F, Benitration reactor trips.
The invention has the advantages that the use for the cascade control strategy that tandem variable element and theoretical ammonia flow are adjusted as pair,
It solves denitration reaction system and has large time delay, there are the characteristics such as self-balancing to influence to control system bring, the system that tightens control is anti-
Ability is disturbed, so that spray ammonia automatic control system is stablized investment, devoting rate is improved to 90% or more, and ammonia has been greatly reduced
Consumption, also ensures the normal operation of air preheater, electric precipitation, lowers operations staff's manipulation strength, when reducing the super row of denitration
Between, it ensure that the safe and economic operation of unit.
Specific embodiment
Clear and complete description is done to the present invention below, so that those skilled in the art is not needing to make creative labor
Under conditions of dynamic, it can sufficiently implement the present invention.
A specific embodiment of the invention is: one kind being based on tandem variable element denitration autocontrol method, including following step
It is rapid:
1) reactor outlet NOx standard state value is adjusted, needed for calculating by the difference of reactor outlet NOx setting value and measured value
The variable quantity of ammonia flow；
2) sprayed ammonia flow is adjusted, using ammonia nitrogen molar ratio principle, control system is according to current flue gas flow, SCR
Entrance NOx concentration and setting ammonia nitrogen molar ratio computing calculate ammonia flow, then add the variation of the calculated ammonia flow of homophony
The setting value adjusted as pair is measured, ammonia flow setting value and practical ammonia flow difference calculate valve opening, and pair is adjusted to coarse adjustment,
The variation of quick response entrance NOx variation and flue gas flow；
3) CEMS instrument automatic Calibration, two hours of the every mistake of system carry out automatic Calibration using zero-bit of the air to analysis meter,
The automatic Calibration time is 10min, and the measurement of analysis meter parameter is maintained at value before calibration during this period；
4) safety measure is arranged in spray ammonia automatic control loop；
5) corresponding spray ammonia is forcibly closed when reactor tripping, flue-gas temperature are lower than 300 DEG C or spray ammonia shut-off valve has closed to adjust
Valve.
Further, in the step 1) reactor outlet NOx setting value between 20mg/Nm3~40mg/Nm3, if
When to determine reactor outlet NOx and its setting value deviation be e mg/Nm3 , ∣ e ∣ > 8mg/Nm3, proportional band 200, the time of integration 250,
Regulator parameter is strong, reduces deviation as early as possible；When 4mg/Nm3 < ∣ e ∣ < 8mg/Nm3, proportional band 260, the time of integration 350 is adjusted
Device ginseng is relatively weak, is normally adjusted；When ∣ e ∣ < 4mg/Nm3, proportional band 360, the time of integration 450, regulator parameter is very weak,
Ammonia flow is maintained, SCR fully reacting, system autobalance are made.
Further, meter calibration is 4 block analysis instrument automatic Calibration of denitration A, B side reaction device entrance in the step 3)
Time setting difference half an hour, when the side entrance A analyzer automatic Calibration, the side entrance A NOx according to the side entrance B NOx change
It adjusts, records the side entrance A NOx and the side entrance B NOx ratio value before automatic Calibration, in the side entrance A when analyzer automatic Calibration, A
Side entrance NOX is equal to record ratio multiplied by the side entrance B NOx ratio value, can also react the true side entrance A NOx variation in this way；When out
When entrance analyzer automatic Calibration, outlet NOx is adjusted according to changing with side entrance NOx, exports NOx before recording automatic Calibration
With same side entrance NOx ratio value, in exit analysis instrument automatic Calibration, outlet NOx is equal to record ratio multiplied by same side entrance NOx,
True outlet NOx variation can be also reacted in this way.
Further, the safety measure in the step 4) includes:
1, when exit NOx concentration is greater than 45mg/Nm3, locking is closed instruction by the manual operator of executing agency；
2, setting spray ammonia regulating valve instructs the upper limit 90%, lower limit 10%.Integral saturation in order to prevent, secondary controller export the upper limit 90%,
Lower limit 10%, master selector exports upper limit 88t/h, lower limit 20t/h, when valve is opened to 90%, ammonia flow 88t/h, valve open to
When 10%, ammonia flow 20t/h；
3, rationally setting regulating valve cuts manual condition, any condition triggering, and regulating valve is switched to manually simultaneously soft light word warning reminding fortune
Administrative staff.
Further, the reasonable setting regulating valve and manual condition is:
A, reactor inlet NOx bad point；
B, reactor outlet NOx bad point；
C, ammonia flow bad point；
D, regulating valve instruction is greater than 10% with feedback deviation value；
E, it exports NOx setting value and measured value deviation is greater than 25mg/Nm3；
F, Benitration reactor trips.
Presently preferred embodiments of the present invention is described above, it should be pointed out that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, technology according to the present invention
Essence any simple modifications, equivalents, and modifications made to the above embodiment still fall within technical solution of the present invention protection
In the range of.
Claims (5)
1. one kind is based on tandem variable element denitration autocontrol method, which comprises the following steps:
1) reactor outlet NOx standard state value is adjusted, needed for calculating by the difference of reactor outlet NOx setting value and measured value
The variable quantity of ammonia flow；
2) sprayed ammonia flow is adjusted, using ammonia nitrogen molar ratio principle, control system is according to current flue gas flow, SCR
Entrance NOx concentration and setting ammonia nitrogen molar ratio computing calculate ammonia flow, then add the variation of the calculated ammonia flow of homophony
The setting value adjusted as pair is measured, ammonia flow setting value and practical ammonia flow difference calculate valve opening, and pair is adjusted to coarse adjustment,
The variation of quick response entrance NOx variation and flue gas flow；
3) CEMS instrument automatic Calibration, two hours of the every mistake of system carry out automatic Calibration using zero-bit of the air to analysis meter,
The automatic Calibration time is 10min, and the measurement of analysis meter parameter is maintained at value before calibration during this period；
4) safety measure is arranged in spray ammonia automatic control loop；
5) corresponding spray ammonia is forcibly closed when reactor tripping, flue-gas temperature are lower than 300 DEG C or spray ammonia shut-off valve has closed to adjust
Valve.
2. according to claim 1 a kind of based on tandem variable element denitration autocontrol method, which is characterized in that the step
It is rapid 1) in reactor outlet NOx setting value between 20mg/Nm3~40mg/Nm3, setting reactor outlet NOx set with it
When value deviation is e mg/Nm3 , ∣ e ∣ > 8mg/Nm3, proportional band 200, the time of integration 250, regulator parameter is strong, reduces as early as possible inclined
Difference；When 4mg/Nm3 < ∣ e ∣ < 8mg/Nm3, proportional band 260, the time of integration 350, adjuster ginseng is relatively weak, is normally adjusted；
When ∣ e ∣ < 4mg/Nm3, proportional band 360, the time of integration 450, regulator parameter is very weak, maintains ammonia flow, has reacted SCR
Entirely, system autobalance.
3. according to claim 1 a kind of based on tandem variable element denitration autocontrol method, which is characterized in that the step
It is rapid 3) in meter calibration be 4 block analysis instrument automatic Calibration of denitration A, B side reaction device entrance time setting difference half an hour, when
When the analyzer automatic Calibration of the side entrance A, the side entrance A NOx changes according to the side entrance B NOx to adjust, and records A before automatic Calibration
Side entrance NOx and the side entrance B NOx ratio value, in the side entrance A when analyzer automatic Calibration, the side entrance A NOX is equal to record ratio
Multiplied by the side entrance B NOx ratio value, the true side entrance A NOx variation can be also reacted in this way；When entrance analyzer automatic Calibration,
Outlet NOx is adjusted according to changing with side entrance NOx, record before automatic Calibration outlet NOx with side entrance NOx ratio value,
When exit analysis instrument automatic Calibration, outlet NOx is equal to record ratio multiplied by same side entrance NOx, can also react true outlet in this way
NOx variation.
4. according to claim 1 a kind of based on tandem variable element denitration autocontrol method, which is characterized in that the step
It is rapid 4) in safety measure include:
(1) when exit NOx concentration is greater than 45mg/Nm3, locking is closed instruction by the manual operator of executing agency；
(2) setting spray ammonia regulating valve instructs the upper limit 90%, lower limit 10%.Integral saturation in order to prevent, secondary controller export the upper limit
90%, lower limit 10%, master selector exports upper limit 88t/h, lower limit 20t/h, when valve is opened to 90%, ammonia flow 88t/h, and valve
When opening to 10%, ammonia flow 20t/h；
(3) rationally setting regulating valve cuts manual condition, any condition triggering, and regulating valve is switched to manually simultaneously soft light word warning reminding fortune
Administrative staff.
5. according to claim 4 a kind of based on tandem variable element denitration autocontrol method, which is characterized in that the conjunction
Regulating valve is arranged in reason and manual condition is:
A, reactor inlet NOx bad point；
B, reactor outlet NOx bad point；
C, ammonia flow bad point；
D, regulating valve instruction is greater than 10% with feedback deviation value；
E, it exports NOx setting value and measured value deviation is greater than 25mg/Nm3；
F, Benitration reactor trips.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109794150A (en) * | 2019-03-20 | 2019-05-24 | 中国华能集团清洁能源技术研究院有限公司 | A method and system for controlling flue gas denitration of a CFB boiler with an external bed |
| CN111228979A (en) * | 2020-03-05 | 2020-06-05 | 瀚蓝工程技术有限公司 | Advanced automatic control method and control device for PSR (polymer dispersed particulate reactor) polymer denitration dosage |
| CN112506237A (en) * | 2020-11-09 | 2021-03-16 | 华能铜川照金煤电有限公司 | Control method for automatically adjusting urea flow distribution of single urea spray gun |
| CN113578006A (en) * | 2021-07-02 | 2021-11-02 | 大唐东北电力试验研究院有限公司 | SCR (selective catalytic reduction) denitration control method based on control strategy optimization |
| CN114035426A (en) * | 2021-11-17 | 2022-02-11 | 华电电力科学研究院有限公司 | Control method, device and equipment of cascade regulation system and storage medium |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109794150A (en) * | 2019-03-20 | 2019-05-24 | 中国华能集团清洁能源技术研究院有限公司 | A method and system for controlling flue gas denitration of a CFB boiler with an external bed |
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| CN111228979A (en) * | 2020-03-05 | 2020-06-05 | 瀚蓝工程技术有限公司 | Advanced automatic control method and control device for PSR (polymer dispersed particulate reactor) polymer denitration dosage |
| CN112506237A (en) * | 2020-11-09 | 2021-03-16 | 华能铜川照金煤电有限公司 | Control method for automatically adjusting urea flow distribution of single urea spray gun |
| CN113578006A (en) * | 2021-07-02 | 2021-11-02 | 大唐东北电力试验研究院有限公司 | SCR (selective catalytic reduction) denitration control method based on control strategy optimization |
| CN113578006B (en) * | 2021-07-02 | 2024-06-14 | 大唐东北电力试验研究院有限公司 | SCR denitration control method based on control strategy optimization |
| CN114035426A (en) * | 2021-11-17 | 2022-02-11 | 华电电力科学研究院有限公司 | Control method, device and equipment of cascade regulation system and storage medium |
| CN114035426B (en) * | 2021-11-17 | 2023-06-30 | 华电电力科学研究院有限公司 | Control method, device, equipment and storage medium of cascade control system |
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Application publication date: 20190315 |