CN110397614A - A kind of airflow pressure automatic control system of fired power generating unit - Google Patents
A kind of airflow pressure automatic control system of fired power generating unit Download PDFInfo
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- CN110397614A CN110397614A CN201910642575.6A CN201910642575A CN110397614A CN 110397614 A CN110397614 A CN 110397614A CN 201910642575 A CN201910642575 A CN 201910642575A CN 110397614 A CN110397614 A CN 110397614A
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- blower
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/007—Conjoint control of two or more different functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0253—Surge control by throttling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0261—Surge control by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0284—Conjoint control of two or more different functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0292—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/301—Pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a kind of airflow pressure automatic control systems of fired power generating unit, blower baffle carries out wind pressure control, in conjunction with pressure fan frequency control, blower baffle nearly reaches standard-sized sheet under high loads, aperture is also greatly improved at low load, the windage of baffle is reduced, while effectively reducing the action frequency of baffle, increases the reliability and service life of baffle.The wind pressure of burner hearth is sent into using pressure fan under this pressure fan frequency conversion automatic control and the available current loads of wind pressure Collaborative Control scheme, improve the speed that air-introduced machine regulates and controls according to combustion chamber draft, realize the automatic control of the air quantity and wind pressure of fired power generating unit, the restriction loss of system is reduced, the generation of blower surge phenomenon is reduced.Pressure fan automatic start-stop system is increased, optimal frequency converter instruction and fan operation number of units are calculated according to current loads and blower power consumption characteristics curve, optimal fan operation combination is judged, the start and stop of blower is carried out automatically controlling, system energy consumption is reduced.
Description
Technical field
The invention belongs to the automation fields of coal-fired power plant, and in particular to a kind of airflow pressure of fired power generating unit is automatic
Control system.
Background technique
Country persistently promotes Energy restructuring, and the clean energy resourcies such as wind energy, solar energy have obtained development continuously and healthily, but
Since a large amount of wind-powered electricity generations, photovoltaic concentrate construction to contradict with peak load regulation network power outage, the consumption situation of clean energy resource is caused increasingly
It is severe.On the other hand, China's imbalance between power supply and demand is changed from shortage to relative surplus.Therefore, load tune wide for fired power generating unit
The requirement of peak energy power is higher and higher, and underrun certainly will become normality.
Fired power generating unit send air inducing machine equipment to be often designed as two, under wide load peaking operation, one typhoon when underload
Machine can meet power generation requirements, and when high load capacity needs two Fans while running.Conventional air-supply fan delivery adjusting method is to send
Blower power frequency operation adjusts air output by baffle flow restriction.
The method although adjustable air quantity, but system resistance is increased, increase the restriction loss of system, pressure fan
Energy consumption of electrical machinery is not saved, and energy-efficient purpose is unable to reach；Baffle opening is too small, windage is excessive, and it is existing that blower surge also easily occurs
As bringing hidden danger to unit safety.
Summary of the invention
For in the prior art the technical issues of, the present invention provides a kind of airflow pressure of fired power generating unit automatically control be
System reduces the restriction loss of system as far as possible, reduces system its object is to realize the automatic control of the air quantity of fired power generating unit and wind pressure
System energy consumption, reduces the generation of blower surge phenomenon, it is ensured that the safety of unit.
In order to solve the above technical problems, the present invention is resolved by following scheme:
A kind of airflow pressure automatic control system of fired power generating unit, including blower, baffle, Secondary Air main-piping pressure sensing
Device, unit load acquisition module, Secondary Air main-piping pressure computing module, baffle opening control module, oxygen content measurement device, air quantity
Correction module, Wind Coverage Calculation module and fan rotary speed control module；
The blower is arranged in Secondary Air main pipe entrance；The baffle plate setting is in Secondary Air main pipe；The Secondary Air is female
Pipe pressure sensor is arranged in Secondary Air main pipe, for measuring the actual pressure value of Secondary Air main pipe；The oxygen content measurement dress
It installs at boiler flue gas outlet, for measuring the oxygen amount in boiler export flue gas；
The unit load acquisition module is sent to Secondary Air mother for acquiring unit load, and by the unit load of acquisition
Pipe pressure computing module and Wind Coverage Calculation module, the Secondary Air main-piping pressure computing module are used to calculate two according to unit load
The theoretical pressure value of secondary wind main pipe, and theoretical pressure value is sent to baffle opening control module, the baffle opening controls mould
The theory that block receives the actual pressure value that Secondary Air main-piping pressure sensor is sent and Secondary Air main-piping pressure computing module is sent
Pressure value, and compare the size of theoretical pressure value and actual pressure value, and baffle opening size is controlled according to comparison result, work as reason
When being greater than actual pressure value by pressure value, the aperture of the baffle opening control module control baffle reduces, when theoretical pressure value
When less than actual pressure value, the aperture of the baffle opening control module control baffle increases；
Oxygen amount in the boiler export flue gas of measurement is sent to air quantity correction module, the wind by the oxygen content measurement device
Amount correction module is used to calculate practical air output according to the oxygen amount in boiler export flue gas, and the Wind Coverage Calculation module is used for root
The theoretical air output that blower needs is calculated according to unit load, and theoretical air output is sent to fan rotary speed control module, it is described
Fan rotary speed control module receives practical air output and theoretical air output, and practical air output and theory air output is big
It is small, and according to the revolving speed of comparison result control blower, when practical air output is greater than theoretical air output, the rotation speed of fan control
Module controls rotation speed of fan and reduces, and when practical air output is less than theoretical air output, the fan rotary speed control module controls wind
Machine revolving speed increases.
Further, the blower includes the first blower and the second blower, and the baffle includes first baffle and second gear
Plate, the Secondary Air main pipe include the first branch pipe(tube), the second branch pipe(tube) and main pipe road, first blower and second blower
It is separately positioned on the entrance of first branch pipe(tube) and the entrance of second branch pipe(tube), the outlet of first branch pipe(tube) and institute
The outlet for stating the second branch pipe(tube) is connect with the entrance in the main pipe road, and the Secondary Air main-piping pressure sensor is arranged described
On main pipe road；The first baffle and the second baffle are separately positioned in first branch pipe(tube) and second branch pipe(tube)
It is interior.
Further, the outlet in the main pipe road is connected with air preheater.
Further, control system further includes blower current measuring device, blower start and stop judgment module and blower start and stop control
Molding block, the blower current measuring device are used to measure the actual current value of blower, and actual current value are sent to described
Blower start and stop judgment module, the blower start and stop judgment module obtain actual current value, the practical pressure of Secondary Air main pipe of blower
The power consumption characteristics curve of force value, the theoretical air output that blower needs and blower；
The blower start and stop judgment module calculates the actual power loss of blower according to the actual current value and voltage of blower, simultaneously
The blower start and stop judgment module is according to the actual pressure value of Secondary Air main pipe, the theoretical air output of blower needs and blower
The theoretical power consumption of power consumption characteristics curve calculating blower, the blower start and stop judgment module compare the actual power loss and blower of blower
Theoretical power consumption, and comparison result is sent to the blower start-up and shut-down control module, the blower start-up and shut-down control module is according to comparing
As a result the start and stop of blower are controlled.
Further, when first blower and the second blower work at the same time, the blower start and stop judgment module is calculated
The sum of actual power loss and the actual power loss of the second blower of first blower, while the blower start and stop judgment module is according to two
The power consumption characteristics curve calculating of the actual pressure value of secondary wind main pipe, the theoretical air output that the first blower needs and the first blower the
The theoretical power consumption of one blower, and compare the sum of the actual power loss of the first blower and the actual power loss of the second blower and the first blower
Comparison result is sent to the blower start-up and shut-down control module by the size of theoretical power consumption；
When the sum of the actual power loss of the first blower and the actual power loss of the second blower are less than or equal to the theory of the first blower
When power consumption, the blower start-up and shut-down control module controls first blower and the second blower continues while opening；When the first blower
Actual power loss and the sum of the actual power loss of the second blower when being greater than the theoretical power consumption of the first blower, the blower start-up and shut-down control mould
Block controls first blower and continues starting, and controls second blower and stop working.
Further, when first blower and the second blower work at the same time, the blower start and stop judgment module is calculated
The sum of actual power loss and the actual power loss of the second blower of first blower, while the blower start and stop judgment module is according to two
The power consumption characteristics curve calculating of the actual pressure value of secondary wind main pipe, the theoretical air output that the second blower needs and the second blower the
The theoretical power consumption of two blowers, and compare the sum of the actual power loss of the first blower and the actual power loss of the second blower and the second blower
Comparison result is sent to the blower start-up and shut-down control module by the size of theoretical power consumption；
When the sum of the actual power loss of the first blower and the actual power loss of the second blower are less than or equal to the theory of the second blower
When power consumption, the blower start-up and shut-down control module controls first blower and the second blower continues while opening；When the first blower
Actual power loss and the sum of the actual power loss of the second blower when being greater than the theoretical power consumption of the second blower, the blower start-up and shut-down control mould
Block controls second blower and continues starting, and controls first blower and stop working.
Further, when first blower works, the blower start and stop judgment module calculates first blower
Actual power loss, while the blower start and stop judgment module is according to the actual pressure value of Secondary Air main pipe, the first blower and the second wind
The first blower of power consumption characteristics curve calculating and the second blower of theoretical air output and the first blower and the second blower that machine needs
The sum of theoretical power consumption, and compare the big of the actual power loss of the first blower and the sum of the theoretical power consumption of the first blower and the second blower
It is small, comparison result is sent to the blower start-up and shut-down control module；
It is described when the actual power loss of the first blower is less than or equal to the sum of the first blower and the theoretical power consumption of the second blower
Blower start-up and shut-down control module controls first blower and continues starting；When the actual power loss of the first blower is greater than the first blower and the
When the sum of the theoretical power consumption of two blowers, the blower start-up and shut-down control module controls first blower and continues starting, and controls institute
The second blower is stated also to open.
Further, when second blower works, the blower start and stop judgment module calculates second blower
Actual power loss, while the blower start and stop judgment module is according to the actual pressure value of Secondary Air main pipe, the first blower and the second wind
The first blower of power consumption characteristics curve calculating and the second blower of theoretical air output and the first blower and the second blower that machine needs
The sum of theoretical power consumption, and compare the big of the actual power loss of the second blower and the sum of the theoretical power consumption of the first blower and the second blower
It is small, comparison result is sent to the blower start-up and shut-down control module；
It is described when the actual power loss of the second blower is less than or equal to the sum of the first blower and the theoretical power consumption of the second blower
Blower start-up and shut-down control module controls second blower and continues starting；When the actual power loss of the second blower is greater than the first blower and the
When the sum of the theoretical power consumption of two blowers, the blower start-up and shut-down control module controls second blower and continues starting, and controls institute
The first blower is stated also to open.
Further, the blower start-up and shut-down control module is corresponding while controlling the first blower and the second blower start and stop
Control the opening and closing of first baffle and second baffle；When the first blower is opened, corresponding first baffle is opened；When the second wind
When machine is opened, corresponding second baffle is opened.
Compared with prior art, the present invention at least has the advantages that a kind of air quantity of fired power generating unit of the invention
Wind pressure automatic control system, blower baffle carry out wind pressure control, and due to combining pressure fan frequency control, blower is kept off under high loads
Plate nearly reaches standard-sized sheet, and aperture is also greatly improved at low load, reduces the windage of baffle, is effectively reduced simultaneously
The action frequency of baffle, considerably increases the reliability and service life of baffle.Using the frequency conversion of this pressure fan automatically control and
Pressure fan is sent into the wind pressure of burner hearth under the available current loads of wind pressure Collaborative Control scheme, can be used for air-introduced machine feedforward, mentions
The speed that high air-introduced machine regulates and controls according to combustion chamber draft realizes the air quantity and wind of fired power generating unit so that combustion chamber draft is more stable
The automatic control of pressure reduces the restriction loss of system as far as possible, reduces the generation of blower surge phenomenon, it is ensured that the safety of unit.
Further, blower start and stop judgment module calculates the practical function of blower according to the actual current value and voltage of blower
Consumption, while the theoretical air output and wind that blower start and stop judgment module is needed according to the actual pressure value of Secondary Air main pipe, blower
The theoretical power consumption of the power consumption characteristics curve calculating blower of machine, blower start and stop judgment module compare the actual power loss and blower of blower
Theoretical power consumption, and comparison result is sent to the blower start-up and shut-down control module, blower start-up and shut-down control module is according to comparison result
Control the start and stop of blower.Automatic start-stop control is carried out to blower by blower start-up and shut-down control module, reaches blower automatic control
Energy-efficient purpose reduces operations staff blindly operation and labor intensity.It can be seen that invention increases pressure fan automatic start-stop system,
Optimal frequency converter instruction and fan operation number of units, judgement can be calculated according to current loads and blower power consumption characteristics curve
Optimal fan operation combination, carries out automatically controlling the start and stop of blower, reduces system energy consumption, it is seen that uses frequency control
And blower start and stop automatically control, and can reduce secondary wind pressure in safe range, increase baffle opening, significantly reduce section
Stream loss, frequency conversion reduce pressure fan energy consumption, reach energy-efficient purpose, and which system reduces the labor intensity of operations staff, improve
The automatization level of power plant ensure that the economy and safety of unit operation.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate more clearly of the technical solution in the specific embodiment of the invention, specific embodiment will be retouched below
Attached drawing needed in stating is briefly described, it should be apparent that, the accompanying drawings in the following description is some realities of the invention
Mode is applied, it for those of ordinary skill in the art, without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the schematic diagram of automatic control system of the present invention.
In figure: the first blower of 1-；The second blower of 2-；3- air preheater；4- first baffle；5- second baffle；6- bis- times
Wind main-piping pressure sensor；7- unit load acquisition module；8- Secondary Air main-piping pressure computing module；9- baffle opening controls mould
Block；10- oxygen content measurement device；11- air quantity correction module；12- Wind Coverage Calculation module；13- fan rotary speed control module；14- wind
Electromechanical flow measuring apparatus；15- blower start and stop judgment module；16- blower start-up and shut-down control module.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
It should be noted that description and claims of this specification and term " first " in above-mentioned Detailed description of the invention,
" second " etc. is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that in this way
The data used are interchangeable under appropriate circumstances, so that the embodiment of the present invention described herein can be in addition to scheming herein
Sequence other than those of showing or describe is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
In cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units need not
Those of be limited to be clearly listed step or unit, but may include be not clearly listed or for these process, methods,
The other step or units of product or equipment inherently.
As shown in Figure 1, as a certain preferred embodiment of the invention, a kind of airflow pressure automatic control system of fired power generating unit
System, including blower, baffle, air preheater 3, Secondary Air main-piping pressure sensor 6, unit load acquisition module 7, Secondary Air are female
Pipe pressure computing module 8, baffle opening control module 9, oxygen content measurement device 10, air quantity correction module 11, Wind Coverage Calculation module
12, fan rotary speed control module 13, blower current measuring device 14, blower start and stop judgment module 15 and blower start-up and shut-down control module
16, blower is arranged in Secondary Air main pipe entrance；Baffle plate setting is in Secondary Air main pipe；Secondary Air main-piping pressure sensor 6 is arranged
In Secondary Air main pipe, for measuring the actual pressure value of Secondary Air main pipe；The setting of oxygen content measurement device 10 goes out in boiler smoke
At mouthful, for measuring the oxygen amount in boiler export flue gas.The baffle controls Secondary Air main pipe wind pressure of fan outlet, fan frequency conversion change
Variable speed realizes control air output, so that the airflow pressure during realizing fan operation automatically controls.On the other hand, according to
Blower power consumption characteristics curve calculates, thus judge optimal fan operation combination, thus realize the automatic start-stop control of blower,
It realizes band pressure fan automatic start-stop, realizes that overall process automatically controls.
Specifically, blower includes the first blower 1 and the second blower 2, baffle includes first baffle 4 and second baffle 5, secondary
Wind main pipe includes the first branch pipe(tube), the second branch pipe(tube) and main pipe road, and the first blower 1 and the second blower 2 are separately positioned on first
The entrance of the entrance of pipeline and the second branch pipe(tube), the outlet of the first branch pipe(tube) and exporting for the second branch pipe(tube) enter with main pipe road
Mouth connection, the outlet in main pipe road are connected with air preheater 3, and Secondary Air main-piping pressure sensor 6 is arranged on main pipe road；First
Baffle 4 and second baffle 5 are separately positioned in the first branch pipe(tube) and in the second branch pipe(tube).Such as Fig. 1, the first blower 1 and the second wind
Air is pressurized by machine 2, and the second baffle 5 flowed separately through in the first baffle 4 and the second branch pipe(tube) in the first branch pipe(tube) converges
Enter in main pipe road, is sent into after air preheater 3 preheats and is sent into boiler combustion.
The unit load of acquisition is sent to Secondary Air main pipe for acquiring unit load by unit load acquisition module 7
Calculation of pressure module 8 and Wind Coverage Calculation module 12, Secondary Air main-piping pressure computing module 8 are used to be calculated according to unit load secondary
The theoretical pressure value of wind main pipe, and theoretical pressure value is sent to baffle opening control module 9, baffle opening control module 9 connects
Receive the actual pressure value that Secondary Air main-piping pressure sensor 6 is sent and the theoretical pressure that Secondary Air main-piping pressure computing module 8 is sent
Force value, and compare the size of theoretical pressure value and actual pressure value, and baffle opening size is controlled according to comparison result, work as theory
When pressure value is greater than actual pressure value, the aperture that baffle opening control module 9 controls baffle reduces, when theoretical pressure value is less than in fact
When the pressure value of border, the aperture that baffle opening control module 9 controls baffle increases, the constantly control baffle of baffle opening control module 9
The size of aperture, when theoretical pressure value is equal to actual pressure value, baffle opening control module 9 controls baffle opening size and protects
It holds constant.
Oxygen amount in the boiler export flue gas of measurement is sent to air quantity correction module 11 by oxygen content measurement device 10, and air quantity is repaired
Positive module 11 is used to calculate practical air output according to the oxygen amount in boiler export flue gas, and Wind Coverage Calculation module 12 is used for according to machine
The theoretical air output that group carry calculation blower needs, and theoretical air output is sent to fan rotary speed control module 13, blower turns
Fast control module 13 receives practical air output and theoretical air output, and the size of practical air output and theoretical air output, and
The revolving speed that blower is controlled according to comparison result, when practical air output is greater than theoretical air output, fan rotary speed control module 13 is controlled
Rotation speed of fan processed reduces, and when practical air output is less than theoretical air output, fan rotary speed control module 13 controls rotation speed of fan liter
Height, fan rotary speed control module 13 constantly control the size of rotation speed of fan, when practical air output is equal to theoretical air output,
Fan rotary speed control module 13 controls rotation speed of fan and keeps constant.
In the case where baffle opening control module 9 and fan rotary speed control module 13 cooperate, baffle is controlled to adjust respectively and is opened
Spend size and rotation speed of fan size, baffle opening increasing or reducing slowly, rotation speed of fan being decreased or increased slowly, when finding
When common equalization point, baffle opening size and rotation speed of fan size respectively maintain stable state.
As shown in Figure 1, blower current measuring device 14 is used to measure the actual current value of blower, and actual current value is sent out
Blower start and stop judgment module 15 is given, blower start and stop judgment module 15 obtains actual current value, the reality of Secondary Air main pipe of blower
The power consumption characteristics curve of border pressure value, the theoretical air output that blower needs and blower, blower start and stop judgment module 15 is from secondary
The actual pressure value of Secondary Air main pipe is obtained at wind main-piping pressure sensor 6, blower start and stop judgment module 15 is from Wind Coverage Calculation mould
The theoretical air output that blower needs is obtained at block 12, the power consumption characteristics curve of every Fans is fixed；Blower start and stop judgement
Module 15 calculates the actual power loss of blower, while 15 basis of blower start and stop judgment module according to the actual current value and voltage of blower
The reason of the power consumption characteristics curve calculating blower of the actual pressure value of Secondary Air main pipe, the theoretical air output of blower needs and blower
By power consumption, blower start and stop judgment module 15 compares the actual power loss of blower and the theoretical power consumption of blower, and comparison result is sent
Fan start-up and shut-down control module 16, blower start-up and shut-down control module 16 control the start and stop of blower according to comparison result.I.e. by Secondary Air
Main-piping pressure sensor 6 measures obtained main-piping pressure, according to the calculated theoretical wind of current loads downdraft computing module 12
The blower electric current that amount and blower current measuring device 14 measure is sent into blower start and stop judgment module 15 and is calculated, using current
Fan operation combination leeward electromechanics stream, voltage acquire the practical wasted work of current operation blower, while being asked using fan performance curve
The wasted work that other fan operations combine lower blowers is obtained, is compared and obtains optimal fan operation combination.Pass through blower start-up and shut-down control
Module 16 carries out automatic start-stop control to blower, achievees the purpose that blower auto-controlled energy-saving, reduces operations staff and blindly operates
And labor intensity.It is specific as follows:
When the first blower 1 and the second blower 2 work at the same time, blower start and stop judgment module 15 calculates the reality of the first blower 1
The sum of the actual power loss of border power consumption and the second blower 2, while blower start and stop judgment module 15 is according to the practical pressure of Secondary Air main pipe
The theory of the first blower of power consumption characteristics curve calculating 1 of force value, the theoretical air output that the first blower 1 needs and the first blower 1
Power consumption, and compare the theoretical power consumption of the sum of the actual power loss of the first blower 1 and the actual power loss of the second blower 2 with the first blower 1
Size, by comparison result send fan start-up and shut-down control module 16.When the actual power loss and second blower 2 of the first blower 1
When the sum of actual power loss is less than or equal to the theoretical power consumption of the first blower 1, blower start-up and shut-down control module 16 controls 1 He of the first blower
Second blower 2 continues while opening；When the sum of the actual power loss of the first blower 1 and the actual power loss of the second blower 2 are greater than first
When the theoretical power consumption of blower 1, blower start-up and shut-down control module 16 controls the first blower 1 and continues starting, and controls the second blower 2 and stop
Work.
When the first blower 1 and the second blower 2 work at the same time, blower start and stop judgment module 15 calculates the reality of the first blower 1
The sum of the actual power loss of border power consumption and the second blower 2, while blower start and stop judgment module 15 is according to the practical pressure of Secondary Air main pipe
The theory of the second blower of power consumption characteristics curve calculating 2 of force value, the theoretical air output that the second blower 2 needs and the second blower 2
Power consumption, and compare the theoretical power consumption of the sum of the actual power loss of the first blower 1 and the actual power loss of the second blower 2 with the second blower 2
Size, by comparison result send fan start-up and shut-down control module 16.When the actual power loss and second blower 2 of the first blower 1
When the sum of actual power loss is less than or equal to the theoretical power consumption of the second blower 2, blower start-up and shut-down control module 16 controls 1 He of the first blower
Second blower 2 continues while opening；When the sum of the actual power loss of the first blower 1 and the actual power loss of the second blower 2 are greater than second
When the theoretical power consumption of blower 2, blower start-up and shut-down control module 16 controls the second blower 2 and continues starting, and controls the first blower 1 and stop
Work.
When the work of the first blower 1, blower start and stop judgment module 15 calculates the actual power loss of the first blower 1, while blower
The theoretical air output that start and stop judgment module 15 is needed according to the actual pressure value of Secondary Air main pipe, the first blower 1 and the second blower 2
And first blower 1 and the second blower 2 power consumption characteristics curve calculating the first blower 1 and the second blower 2 the sum of theoretical power consumption,
And compare the size of the sum of the actual power loss of the first blower 1 and the theoretical power consumption of the first blower 1 and the second blower 2, knot will be compared
Fruit sends fan start-up and shut-down control module 16.When the actual power loss of the first blower 1 is less than or equal to the first blower 1 and the second blower
When the sum of 2 theoretical power consumption, blower start-up and shut-down control module 16 controls the first blower 1 and continues starting；When the practical function of the first blower 1
When consumption is greater than the sum of the theoretical power consumption of the first blower 1 and the second blower 2, blower start-up and shut-down control module 16 control the first blower 1 after
It is continuous to open, and control the second blower 2 and also open.
When the work of the second blower 2, blower start and stop judgment module 15 calculates the actual power loss of the second blower 2, while blower
The theoretical air output that start and stop judgment module 15 is needed according to the actual pressure value of Secondary Air main pipe, the first blower 1 and the second blower 2
And first blower 1 and the second blower 2 power consumption characteristics curve calculating the first blower 1 and the second blower 2 the sum of theoretical power consumption,
And compare the size of the sum of the actual power loss of the second blower 2 and the theoretical power consumption of the first blower 1 and the second blower 2, knot will be compared
Fruit sends fan start-up and shut-down control module 16.When the actual power loss of the second blower 2 is less than or equal to the first blower 1 and the second blower
When the sum of 2 theoretical power consumption, blower start-up and shut-down control module 16 controls the second blower 2 and continues starting；When the practical function of the second blower 2
When consumption is greater than the sum of the theoretical power consumption of the first blower 1 and the second blower 2, blower start-up and shut-down control module 16 control the second blower 2 after
It is continuous to open, and control the first blower 1 and also open.
As a certain preferred embodiment of the invention, blower start-up and shut-down control module 16 is controlling the first blower 1 and the second wind
While 2 start and stop of machine, the opening and closing of corresponding control first baffle 4 and second baffle 5；It is corresponding when the first blower 1 is opened
First baffle 4 is opened；When the second blower 2 is opened, corresponding second baffle 5 is opened.
The present invention can also pass through the blower electric current 14 and Secondary Air main-piping pressure of monitoring blower current measuring device measurement
Sensor 6 measures the fluctuation situation of obtained main-piping pressure, can judge fan operation situation, if blower asthma occur
The bad conditions such as vibration cut off to manual operation control the control of pressure fan automatic start-stop.
The present invention realizes the automatic control of the air quantity and wind pressure of fired power generating unit, reduces the restriction loss of system, reduces system
System energy consumption, reduces the generation of blower surge phenomenon, it is ensured that the safety of unit, while realizing the automatic start-stop control of unit, it reduces
Operations staff's labor intensity avoids power of fan caused by the pressure fan start stop operation of blindness from losing.
Finally, it should be noted that above embodiments, only a specific embodiment of the invention, to illustrate skill of the invention
Art scheme, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to the present invention into
Go detailed description, those skilled in the art should understand that: anyone skilled in the art is at this
It invents in the technical scope disclosed, can still modify or can be thought easily to technical solution documented by previous embodiment
To variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make corresponding
The essence of technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection scope of the present invention
Within.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. a kind of airflow pressure automatic control system of fired power generating unit, it is characterised in that: including blower, baffle, Secondary Air main pipe
Pressure sensor (6), unit load acquisition module (7), Secondary Air main-piping pressure computing module (8), baffle opening control module
(9), oxygen content measurement device (10), air quantity correction module (11), Wind Coverage Calculation module (12) and fan rotary speed control module (13)；
The blower is arranged in Secondary Air main pipe entrance；The baffle plate setting is in Secondary Air main pipe；The Secondary Air main pipe pressure
Force snesor (6) is arranged in Secondary Air main pipe, for measuring the actual pressure value of Secondary Air main pipe；The oxygen content measurement device
(10) it is arranged at boiler flue gas outlet, for measuring the oxygen amount in boiler export flue gas；
The unit load acquisition module (7) is sent to Secondary Air mother for acquiring unit load, and by the unit load of acquisition
Pipe pressure computing module (8) and Wind Coverage Calculation module (12), the Secondary Air main-piping pressure computing module (8) are used for according to unit
The theoretical pressure value of carry calculation Secondary Air main pipe, and theoretical pressure value is sent to baffle opening control module (9), the gear
Plate aperture control module (9) receives the actual pressure value and Secondary Air main-piping pressure that Secondary Air main-piping pressure sensor (6) are sent
The theoretical pressure value that computing module (8) is sent, and compare the size of theoretical pressure value and actual pressure value, and according to comparison result
Baffle opening size is controlled, when theoretical pressure value is greater than actual pressure value, the baffle opening control module (9) controls baffle
Aperture reduce, when theoretical pressure value is less than actual pressure value, the aperture of the baffle opening control module (9) control baffle
Increase；
Oxygen amount value in the boiler export flue gas of measurement is sent to air quantity correction module (11) by the oxygen content measurement device (10),
The air quantity correction module (11) receives the oxygen amount value in boiler export flue gas, and the air quantity correction module (11) is used for basis and connects
Oxygen amount value in the boiler export flue gas of receipts calculates practical air output, and the Wind Coverage Calculation module (12) is used for negative according to unit
Lotus calculates the theoretical air output that blower needs, and theoretical air output is sent to fan rotary speed control module (13), the blower
Rotational speed control module (13) receives practical air output and theoretical air output, and practical air output and theory air output is big
It is small, and according to the revolving speed of comparison result control blower, when practical air output is greater than theoretical air output, the rotation speed of fan control
Module (13) controls rotation speed of fan and reduces, when practical air output is less than theoretical air output, the fan rotary speed control module
(13) control rotation speed of fan increases.
2. a kind of airflow pressure automatic control system of fired power generating unit according to claim 1, it is characterised in that: the wind
Machine includes the first blower (1) and the second blower (2), and the baffle includes first baffle (4) and second baffle (5), described secondary
Wind main pipe includes the first branch pipe(tube), the second branch pipe(tube) and main pipe road, and first blower (1) and second blower (2) are respectively
The entrance of first branch pipe(tube) and the entrance of second branch pipe(tube), the outlet of first branch pipe(tube) and described are set
The outlet of two branch pipe(tube)s is connect with the entrance in the main pipe road, and the Secondary Air main-piping pressure sensor (6) is arranged described
On main pipe road；The first baffle (4) and the second baffle (5) are separately positioned in first branch pipe(tube) and described second
In branch pipe(tube).
3. a kind of airflow pressure automatic control system of fired power generating unit according to claim 2, it is characterised in that: described dry
The outlet of pipeline is connected with air preheater (3).
4. a kind of airflow pressure automatic control system of fired power generating unit according to claim 2, it is characterised in that: control system
System further includes blower current measuring device (14), blower start and stop judgment module (15) and blower start-up and shut-down control module (16), described
Blower current measuring device (14) is used to measure the actual current value of blower, and actual current value is sent to the blower start and stop
Judgment module (15), the blower start and stop judgment module (15) obtain actual current value, the practical pressure of Secondary Air main pipe of blower
The power consumption characteristics curve of force value, the theoretical air output that blower needs and blower；
The blower start and stop judgment module (15) calculates the actual power loss of blower according to the actual current value and voltage of blower, simultaneously
The theoretical air output and wind that the blower start and stop judgment module (15) needs according to the actual pressure value of Secondary Air main pipe, blower
The theoretical power consumption of the power consumption characteristics curve calculating blower of machine, the blower start and stop judgment module (15) compare the actual power loss of blower
With the theoretical power consumption of blower, and comparison result is sent to the blower start-up and shut-down control module (16), the blower start-up and shut-down control
Module (16) controls the start and stop of blower according to comparison result.
5. a kind of airflow pressure automatic control system of fired power generating unit according to claim 4, it is characterised in that: when described
When first blower (1) and the second blower (2) work at the same time, the blower start and stop judgment module (15) calculates first blower
(1) the sum of the actual power loss of actual power loss and the second blower (2), while the blower start and stop judgment module (15) is according to secondary
The power consumption characteristics curve of the actual pressure value of wind main pipe, the theoretical air output that the first blower (1) needs and the first blower (1) pushes away
Calculate the theoretical power consumption of the first blower (1), and compare the first blower (1) actual power loss and the second blower (2) actual power loss it
With the size of the theoretical power consumption with the first blower (1), comparison result is sent to the blower start-up and shut-down control module (16)；
When the sum of the actual power loss of the first blower (1) and the actual power loss of the second blower (2) are less than or equal to the first blower (1)
When theoretical power consumption, the blower start-up and shut-down control module (16) controls first blower (1) and the second blower (2) continues while opening
It opens；When the sum of the actual power loss of the first blower (1) and the actual power loss of the second blower (2) are greater than the theoretical function of the first blower (1)
Time-consuming, the blower start-up and shut-down control module (16) controls first blower (1) and continues starting, and controls second blower
(2) it stops working.
6. a kind of airflow pressure automatic control system of fired power generating unit according to claim 4, it is characterised in that: when described
When first blower (1) and the second blower (2) work at the same time, the blower start and stop judgment module (15) calculates first blower
(1) the sum of the actual power loss of actual power loss and the second blower (2), while the blower start and stop judgment module (15) is according to secondary
The power consumption characteristics curve of the actual pressure value of wind main pipe, the theoretical air output that the second blower (2) needs and the second blower (2) pushes away
Calculate the theoretical power consumption of the second blower (2), and compare the first blower (1) actual power loss and the second blower (2) actual power loss it
With the size of the theoretical power consumption with the second blower (2), comparison result is sent to the blower start-up and shut-down control module (16)；
When the sum of the actual power loss of the first blower (1) and the actual power loss of the second blower (2) are less than or equal to the second blower (2)
When theoretical power consumption, the blower start-up and shut-down control module (16) controls first blower (1) and the second blower (2) continues while opening
It opens；When the sum of the actual power loss of the first blower (1) and the actual power loss of the second blower (2) are greater than the theoretical function of the second blower (2)
Time-consuming, the blower start-up and shut-down control module (16) controls second blower (2) and continues starting, and controls first blower
(1) it stops working.
7. a kind of airflow pressure automatic control system of fired power generating unit according to claim 4, it is characterised in that: when described
When first blower (1) works, the blower start and stop judgment module (15) calculates the actual power loss of first blower (1), simultaneously
The blower start and stop judgment module (15) needs according to the actual pressure value of Secondary Air main pipe, the first blower (1) and the second blower (2)
The first blower of power consumption characteristics curve calculating (1) and second of the theoretical air output and the first blower (1) and the second blower (2) wanted
The sum of the theoretical power consumption of blower (2), and compare the actual power loss and the first blower (1) and the second blower (2) of the first blower (1)
Comparison result is sent to the blower start-up and shut-down control module (16) by the size of the sum of theoretical power consumption；
When the actual power loss of the first blower (1) is less than or equal to the sum of the theoretical power consumption of the first blower (1) and the second blower (2)
When, the blower start-up and shut-down control module (16) controls first blower (1) and continues starting；When the practical function of the first blower (1)
When consumption is greater than the sum of the theoretical power consumption of the first blower (1) and the second blower (2), the blower start-up and shut-down control module (16) controls institute
It states the first blower (1) to continue starting, and controls second blower (2) and also open.
8. a kind of airflow pressure automatic control system of fired power generating unit according to claim 4, it is characterised in that: when described
When second blower (2) works, the blower start and stop judgment module (15) calculates the actual power loss of second blower (2), simultaneously
The blower start and stop judgment module (15) needs according to the actual pressure value of Secondary Air main pipe, the first blower (1) and the second blower (2)
The first blower of power consumption characteristics curve calculating (1) and second of the theoretical air output and the first blower (1) and the second blower (2) wanted
The sum of the theoretical power consumption of blower (2), and compare the actual power loss and the first blower (1) and the second blower (2) of the second blower (2)
Comparison result is sent to the blower start-up and shut-down control module (16) by the size of the sum of theoretical power consumption；
When the actual power loss of the second blower (2) is less than or equal to the sum of the theoretical power consumption of the first blower (1) and the second blower (2)
When, the blower start-up and shut-down control module (16) controls second blower (2) and continues starting；When the practical function of the second blower (2)
When consumption is greater than the sum of the theoretical power consumption of the first blower (1) and the second blower (2), the blower start-up and shut-down control module (16) controls institute
It states the second blower (2) to continue starting, and controls first blower (1) and also open.
9. according to a kind of described in any item airflow pressure automatic control systems of fired power generating unit of claim 5~8, feature exists
In: the blower start-up and shut-down control module (16) is while controlling the first blower (1) and the second blower (2) start and stop, corresponding control
The opening and closing of first baffle (4) and second baffle (5)；When the first blower (1) is opened, corresponding first baffle (4) is opened；
When the second blower (2) are opened, corresponding second baffle (5) is opened.
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| CN110985429A (en) * | 2019-12-17 | 2020-04-10 | 浙江浙能技术研究院有限公司 | Control device and method for detecting and eliminating fan stall |
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