CN106292270A - A kind of CFBB denitration automaton and method thereof - Google Patents
A kind of CFBB denitration automaton and method thereof Download PDFInfo
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- CN106292270A CN106292270A CN201610815491.4A CN201610815491A CN106292270A CN 106292270 A CN106292270 A CN 106292270A CN 201610815491 A CN201610815491 A CN 201610815491A CN 106292270 A CN106292270 A CN 106292270A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001186 cumulative effect Effects 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 218
- 239000004202 carbamide Substances 0.000 claims description 108
- 235000013877 carbamide Nutrition 0.000 claims description 108
- 239000007788 liquid Substances 0.000 claims description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000012895 dilution Substances 0.000 claims description 10
- 238000010790 dilution Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 230000003134 recirculating effect Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 106
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 240000006829 Ficus sundaica Species 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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.
-
- 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
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- 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
- B01D2251/2067—Urea
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Automation & Control Theory (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a kind of CFBB denitration automaton and method thereof.Described device includes NOx discharge control module.This module includes PID controller one, adder one, three function arithmetic unit, adders two.Utilize the NOx setting value of a pair CFBB of PID controller to be adjusted with the deviation value of NOx measured value, deviation value is controlled in the allowed band of CFBB.Adder one is sent in the output of PID controller one.Three function arithmetic unit carry out empirical function computing to the unit load of CFBB, conversion zone temperature, oxygen content respectively, and by adder two feedforward as adder one after cumulative.Adder one output order one is to control the aperture of the NOx regulation valve of CFBB.The present invention is after have employed above-mentioned NOx discharge automatic control technology, the most fruitful in terms of economic benefits, human resources configuration, energy-conserving and environment-protective and generalization etc..
Description
Technical field
The present invention relates to a kind of automaton and autocontrol method thereof, be specifically related to a kind of CFBB
Denitration automaton and autocontrol method thereof.
Background technology
Along with China is more and more higher to environmental requirement and the appearance of environmental protection electrovalence policy so that power plant is to environment protecting and power-saving
Increasingly paying attention to, this factory uses urea solution method denitration, and the double frequency conversion of two-shipper is the most standby, is changed by actuator controlling opening of valve
Become urea liquid flow and reach the purpose of denitration.
This factory is being provided without before NOx discharge automatically controls, and relies primarily on operations staff and manually adjusts urea liquid and adjust
Joint valve opening, adjusts the urea liquid amount reacted with NOx.Due to delivery pump distance burner hearth farther out, and recirculating fluidized bed itself
Have pure delay, the combustion characteristics of big inertia, so Non-follow control is delayed, it is impossible to NOx discharge is controlled in environmental requirement value
Within, or there is NOx discharge and control stable but urea liquid is serious crosses the phenomenon thrown.In the face of the pressure that environmental protection aspect is increasing
Power, this factory controls NOx typically by crossing throwing urea liquid, but thereby results in this factory's economy and occur gliding.Fig. 1 is not for throw
Automatically trendgram time.
From figure 1 it appears that when load changes or urea liquid pressure changes, NOx discharge occurs
Fluctuation, the highest fluctuation to 190mg/m3, minimum then arrive 40mg/m3, at this moment operations staff should adjust urea liquid pressure so that it is
At set-point；Urea liquid to be operated regulation valve, control NOx discharge is in allowed band, and operational ton is relatively big, but control
Effect processed is the most bad, and response speed is relatively slow.
Summary of the invention
It is an object of the invention to solve the deficiencies in the prior art, it is provided that a kind of CFBB denitration is certainly
Dynamic control device and autocontrol method thereof.
To achieve the above object, the present invention realizes by the following technical solutions: a kind of CFBB denitration
Automaton, it includes that NOx discharge control module, described NOx discharge control module include PID controller one, add
Musical instruments used in a Buddhist or Taoist mass one, three function arithmetic unit, adders two；Use NOx setting value and the NOx measured value of described CFBB
As the input of described PID controller one, the deviation value of a pair NOx setting value of described PID controller and NOx measured value is utilized to enter
Row regulation, controls in the allowed band of described CFBB by described deviation value, the output of described PID controller one
Send into described adder one；Unit load, the reaction to described CFBB respectively of described three function arithmetic unit
Regional temperature, oxygen content carry out empirical function computing, and by described adder two cumulative after as described adder one before
Feedback；Described adder one output order one is to control the aperture of the NOx regulation valve of described CFBB.
As the further improvement of such scheme, described CFBB denitration automaton also includes carbamide
Solution pressure control module, described urea liquid pressure control module includes PID controller two；Described PID controller two receives
The urea liquid pressure measuring value of described CFBB and urea liquid pressure set points output order two are to control
The urea liquid delivery pump of described CFBB urea liquid pressure in course of conveying.
As the further improvement of such scheme, described CFBB denitration automaton also includes carbamide
Solution concentration control module, described urea concentration control module includes PID controller three, adder three, divider, multiplication
Device；Described adder three adds up the former urea concentration of described CFBB and the urea concentration of needs, and
Input in described divider；The urea concentration of the described divider described needs of reception is as division factor, and inputs described
In multiplier, the urea liquid flow that described multiplier receives described CFBB current is as multiplication factor and defeated
Enter described PID controller three；Described PID controller three also receives a given parameters i.e. dilution water flow measurement, and exports
Instruction three is to control the aperture of the urea liquid regulation valve of described CFBB.
The present invention also provides for a kind of CFBB denitration autocontrol method, and it comprises the following steps:
One, NOx discharge controls
The NOx setting value of described CFBB is adjusted with the deviation value of NOx measured value, by corresponding deviation
Value controls in the allowed band of described CFBB；
Respectively the unit load of described CFBB, conversion zone temperature, oxygen content are carried out empirical function fortune
Can be regarded as feedforward time cumulative；
In described deviation value, cumulative described feedforward forms instruction one to control the NOx regulation of described CFBB
The aperture of valve.
As the further improvement of such scheme, described CFBB denitration autocontrol method also includes following
Step:
Two, urea liquid Stress control
Urea liquid pressure measuring value and the deviation value of urea liquid pressure set points to described CFBB
It is adjusted；
The deviation value of urea liquid pressure controlling step forms instruction two to control the carbamide of described CFBB
Solution transfer pump urea liquid pressure in course of conveying.
As the further improvement of such scheme, described CFBB denitration autocontrol method also includes following
Step:
Three, urea concentration controls
The former urea concentration of cumulative described CFBB and the urea concentration of needs, obtain accumulated value
One；
The urea concentration of described needs is obtained business as division factor by described accumulated value one,
Urea liquid flow current for described CFBB is amassed by described business as multiplication factor；
One given parameters i.e. dilution water flow measurement and described long-pending deviation value are adjusted；
The deviation value of urea concentration rate-determining steps forms instruction three to control the carbamide of described CFBB
The aperture of solution regulation valve.
The present invention is in this factory by test run internal a period of time, and expects to move towards market, walks out our factory for more
Many enterprises services.The present invention, after have employed above-mentioned NOx discharge automatic control technology, joins from economic benefits, human resources
Put, the aspect such as energy-conserving and environment-protective and generalization the most fruitful.In terms of economic benefits, single unit amount of urea is by average every day
16 tons drop to 11 tons, and with 2000 yuan of calculating per ton, two units probably save 20,000 yuan every day, within 1 year, probably save about 7,000,000
Unit, improves the economy of this factory；In terms of human resources utilization, decrease operations staff's operational ton, improve operations staff
Prison dish efficiency, saves this factory's human cost；Energy-saving and emission-reduction aspect, denitration is effectively controlled this power plant nitrogen oxides row automatically
Put, serve greatly effect to building environmental protection power plant, have received good social effect, saved carbamide greatly simultaneously
Consumption；Optimizing so far to this control system, operational effect is good, it is ensured that the qualified discharge of NOx, this automatic control technology pole
Tool generalization, can promote the use of in other similar power plant.
Accompanying drawing explanation
Fig. 1 be CFBB do not use the present invention CFBB denitration automaton time
The trendgram of indices.
Fig. 2 is the structure chart of the NOx discharge control module of CFBB denitration automaton of the present invention.
Fig. 3 is the structure of the urea liquid pressure control module of CFBB denitration automaton of the present invention
Figure.
Fig. 4 is the structure of the urea concentration control module of CFBB denitration automaton of the present invention
Figure.
Fig. 5 is urea liquid Stress control design sketch of the present invention.
Fig. 6 is that urea concentration of the present invention controls design sketch.
Fig. 7 is that NOx discharge of the present invention controls design sketch.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
Embodiment 1
Referring to Fig. 2, the CFBB denitration automaton of the present invention includes that NOx (nitrogen oxides) discharges
Amount control module.Described NOx discharge control module includes: PID controller 1；Adder 1；Three function arithmetic unit
3；Adder 24.
Use the NOx setting value of described CFBB and NOx measured value as the input of PID controller 1, profit
It is adjusted by the deviation value of one 1 pairs of NOx setting values of PID controller with NOx measured value, controls to follow described by described deviation value
In the allowed band of circulation fluidized bed boiler.Adder 1 is sent in the output of PID controller 1；Three function arithmetic unit 3 points
The other unit load to described CFBB, conversion zone temperature, oxygen content carry out empirical function computing, and pass through institute
State the feedforward as described adder 1 after adder 24 adds up.Adder 1 output order one is to control described recycle stream
The aperture of the NOx regulation valve 100 of fluidized bed boiler.
Corresponding CFBB denitration autocontrol method comprises the following steps:
One, NOx discharge controls
The NOx setting value of described CFBB is adjusted with the deviation value of NOx measured value, by corresponding deviation
Value controls in the allowed band of described CFBB；
Respectively the unit load of described CFBB, conversion zone temperature, oxygen content are carried out empirical function fortune
Can be regarded as feedforward time cumulative；
In described deviation value, cumulative described feedforward forms instruction one to control the NOx regulation of described CFBB
The aperture of valve 100.
Embodiment 2
Referring to Fig. 3, described CFBB denitration automaton is except including the NOx emission of embodiment 1
Amount control module, also includes urea liquid pressure control module.
Urea liquid pressure control module includes PID controller 25.PID controller 25 receives described recirculating fluidized bed pot
The urea liquid pressure measuring value of stove and urea liquid pressure set points output order two are to control described recirculating fluidized bed pot
The urea liquid delivery pump 101 of stove urea liquid pressure in course of conveying.
In like manner, corresponding CFBB denitration autocontrol method is further comprising the steps of:
Two, urea liquid Stress control
Urea liquid pressure measuring value and the deviation value of urea liquid pressure set points to described CFBB
It is adjusted；
The deviation value of urea liquid pressure controlling step forms instruction two to control the carbamide of described CFBB
The solution transfer pump 101 urea liquid pressure in course of conveying.
Embodiment 3
Referring to Fig. 4, described CFBB denitration automaton is except including the NOx emission of embodiment 2
Amount control module and urea liquid pressure control module, also include urea concentration control module.
Described urea concentration control module includes PID controller 36, adder 37, divider 8, multiplier 9.Add
Musical instruments used in a Buddhist or Taoist mass 37 adds up the former urea concentration of described CFBB and the urea concentration of needs, and inputs described
In divider 8.Described divider 8 receives the urea concentration of described needs as division factor, and inputs described multiplier 9
In, described multiplier 9 receives the current urea liquid flow of described CFBB as multiplication factor, and inputs described
PID controller 36.PID controller 36 also receives a given parameters i.e. dilution water flow measurement, and output order three with
Control the aperture of the urea liquid regulation valve 102 of described CFBB.
In like manner, corresponding CFBB denitration autocontrol method is further comprising the steps of:
Three, urea concentration controls
The former urea concentration of cumulative described CFBB and the urea concentration of needs, obtain accumulated value
One；
The urea concentration of described needs is obtained business as division factor by described accumulated value one,
Urea liquid flow current for described CFBB is amassed by described business as multiplication factor；
One given parameters i.e. dilution water flow measurement and described long-pending deviation value are adjusted；
The deviation value of urea concentration rate-determining steps forms instruction three to control the carbamide of described CFBB
The aperture of solution regulation valve 102.
Understanding in conjunction with three above embodiment, the present invention can be summarized as follows.
1, main design idea
By being analyzed and theoretical research unit is properly functioning, the generation of available NOx and coal burning mode, combustion
Burning temperature, excess air coefficient are closely related in factors such as residing time in furnaces with flue gas.Then affect urea liquid anti-with NOx
The influence factor answered mainly has urea liquid amount, conversion zone temperature, oxygen content, coal feeding amount.Owing to coal-supplying amount is according to unit
AGC instruction draws after boiler master computing, and while NOx emission, urea liquid control valve opening adjusts, to stove
Urea liquid amount and NOx that thorax conveying is corresponding carry out chemical reaction.
So the main body control thinking of NOx discharge is exactly to input as PID with measured value by NOx setting value, coal-supplying amount,
Oxygen content and conversion zone temperature are as feedforward.When unit load, oxygen content etc. change, according to corresponding summed up warp
Test function curve and suitably adjust control valve opening, without wait NOx change after be adjusted again, when NOx measured value with
When setting value has certain deviation, PID regulator is utilized to be adjusted again.This control mode can fast, efficiently, control dynamically
NOx discharge processed.
2, control principle drawing
NOx discharge control principle drawing as shown in Figure 2, urea liquid Stress control schematic diagram as shown in Figure 3, Fig. 4
Shown urea concentration control principle drawing.
For control urea liquid pressure at set-point, taked control strategy as shown in Figure 4, because affecting urea liquid pressure
Fluctuating factor is less, therefore uses single loop control system to control urea liquid pressure.Fig. 3 is urea concentration control, logical
After crossing the required urea concentration of setting, by series of computation, calculate required dilution water flow, with dilution water flow measurement
Send into PID controller, control diluting water regulating valve and regulate dilution water flow, thus reach to control the mesh of urea concentration
's.Fig. 2 is NOx Automatic Control Theory figure, and when the factor such as unit load, oxygen content changes, empirical function computing is direct
Deliver to instruction output, thus quickly, efficiently control the disturbance of NOx；Simultaneously utilize PID controller that deviation value is adjusted
Joint, is controlled in allowed band.
3, effect after transformation
In NOx automatically controls debugging, complete the amendment to its logic parameter, achieve through debugging and continuing to optimize
Well Control platform.As Fig. 5, Fig. 6, Fig. 7 be automatically control the trendgram after coming into operation: Fig. 5 be urea liquid Stress control effect
Fruit figure；Fig. 6 is that urea concentration controls design sketch；Fig. 7 is that NOx discharge controls design sketch.
Urea liquid pressure oscillation is not very big as can be seen from Figure 5, and when there being slight perturbations, PID controller can be immediately
Send instruction, by Stress control in setting value.Fig. 6 has reacted the control effect that urea concentration is good, when operator according to
When operation needs to be adjusted concentration, PID can make adjustment in time, makes dilution water flow in given range.Fig. 7 shows
The control effect that this control strategy is good, no matter stable operation of unit or variable load operation, NOx can control in setting value
In the range of.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (6)
1. a CFBB denitration automaton, it is characterised in that: it includes NOx discharge control module,
Described NOx discharge control module includes PID controller one, adder one, three function arithmetic unit, adders two；Use
The NOx setting value of described CFBB and NOx measured value, as the input of described PID controller one, utilize described PID
A pair NOx setting value of controller is adjusted with the deviation value of NOx measured value, controls described deviation value described ciculation fluidized
In the allowed band of bed boiler, described adder one is sent in the output of described PID controller one；Described three function arithmetic unit
Respectively the unit load of described CFBB, conversion zone temperature, oxygen content are carried out empirical function computing, and pass through
As the feedforward of described adder one after described adder two is cumulative；Described adder one output order one is to control described circulation
The aperture of the NOx regulation valve of fluidized-bed combustion boiler.
CFBB denitration automaton the most according to claim 1, it is characterised in that: described recycle stream
Fluidized bed boiler denitration automaton also includes urea liquid pressure control module, described urea liquid pressure control module bag
Include PID controller two；Described PID controller two receives urea liquid pressure measuring value and the carbamide of described CFBB
Solution pressure setting value output order two are to control the urea liquid delivery pump of described CFBB at course of conveying
In urea liquid pressure.
CFBB denitration automaton the most according to claim 1 and 2, it is characterised in that follow described in:
Circulation fluidized bed boiler denitration automaton also includes urea concentration control module, and described urea concentration controls mould
Block includes PID controller three, adder three, divider, multiplier；Described adder three adds up described CFBB
Former urea concentration and the urea concentration of needs, and input in described divider；Described divider receives described needs
Urea concentration as division factor, and input in described multiplier, described multiplier receives described recirculating fluidized bed pot
The current urea liquid flow of stove is as multiplication factor, and inputs described PID controller three；Described PID controller three also receives
One i.e. dilution water flow measurement of given parameters, and output order three is to control the urea liquid of described CFBB
The aperture of regulation valve.
4. a CFBB denitration autocontrol method, it is characterised in that: it comprises the following steps:
One, NOx discharge controls
The NOx setting value of described CFBB is adjusted with the deviation value of NOx measured value, by corresponding deviation value control
System is in the allowed band of described CFBB；
Respectively the unit load of described CFBB, conversion zone temperature, oxygen content are carried out empirical function computing work
For feedforward time cumulative；
In described deviation value, cumulative described feedforward forms instruction one to control the NOx regulation valve of described CFBB
Aperture.
CFBB denitration autocontrol method the most according to claim 4, it is characterised in that: described recycle stream
Fluidized bed boiler denitration autocontrol method is further comprising the steps of:
Two, urea liquid Stress control
The urea liquid pressure measuring value of described CFBB and the deviation value of urea liquid pressure set points are carried out
Regulation；
The deviation value of urea liquid pressure controlling step forms instruction two to control the urea liquid of described CFBB
Delivery pump urea liquid pressure in course of conveying.
6. according to the CFBB denitration autocontrol method described in claim 4 or 5, it is characterised in that follow described in:
Circulation fluidized bed boiler denitration autocontrol method is further comprising the steps of:
Three, urea concentration controls
The former urea concentration of cumulative described CFBB and the urea concentration of needs, obtain accumulated value one；
The urea concentration of described needs is obtained business as division factor by described accumulated value one,
Urea liquid flow current for described CFBB is amassed by described business as multiplication factor；
One given parameters i.e. dilution water flow measurement and described long-pending deviation value are adjusted；
The deviation value of urea concentration rate-determining steps forms instruction three to control the urea liquid of described CFBB
The aperture of regulation valve.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108443870A (en) * | 2018-03-22 | 2018-08-24 | 黄陵矿业煤矸石发电有限公司 | A kind of Properties of CFB urea liquid automatically engages optimization device and method |
| CN108786428A (en) * | 2018-06-07 | 2018-11-13 | 光大环保技术研究院（南京）有限公司 | A kind of SNCR denitration optimal control system and control method |
| CN109107360A (en) * | 2018-11-01 | 2019-01-01 | 国家能源投资集团有限责任公司 | Spray ammonia control method and device based on denitrating system |
| CN109782582A (en) * | 2019-01-14 | 2019-05-21 | 中国华能集团清洁能源技术研究院有限公司 | The control method of SNCR denitration system control device based on uniformly accelerated motion equivalence |
| CN109794149A (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 kind of CFB boiler denitrating flue gas autocontrol method and system |
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| CN109107360B (en) * | 2018-11-01 | 2021-09-21 | 国家能源投资集团有限责任公司 | Ammonia injection control method and device based on denitration system |
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| CN109794149A (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 kind of CFB boiler denitrating flue gas autocontrol method and system |
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