CN109407637A - Control method based on Power Plant DCS System gas heat exchanger precise positioning purging - Google Patents
Control method based on Power Plant DCS System gas heat exchanger precise positioning purging Download PDFInfo
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- CN109407637A CN109407637A CN201811433059.4A CN201811433059A CN109407637A CN 109407637 A CN109407637 A CN 109407637A CN 201811433059 A CN201811433059 A CN 201811433059A CN 109407637 A CN109407637 A CN 109407637A
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- 238000010926 purge Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000004071 soot Substances 0.000 claims abstract description 32
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 239000000428 dust Substances 0.000 claims abstract description 6
- 238000013517 stratification Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 19
- 238000011217 control strategy Methods 0.000 abstract description 2
- 235000013399 edible fruits Nutrition 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 13
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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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
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4184—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by fault tolerance, reliability of production system
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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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32015—Optimize, process management, optimize production line
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Abstract
The invention discloses a kind of control methods based on Power Plant DCS System gas heat exchanger precise positioning purging, including DCS system, rotary gas-to-gas heat exchanger, soot blower and step-by-step control system, by increasing step motion control strategy in Power Plant DCS System, it realizes that soot blowing executing agency sport car precisely moves, so that nozzle is directed at each heat exchange element row steam and vertically purge；Compare nozzle diameter since soot blowing executes machine datum step pitch SIt is big many, some heat exchange elements are unable to get blow-through in a purging circulation, using this method divide in a period X times circulation and to purging point carry out an X-1 integral shift mode, realize the complete vertical purging of each point in entire plane, and Design Orientation purge time is adjustable, realizes the purging strength control of each point in entire plane.The invention provides flexile Purge methods, effectively improves the stifled purging of heat exchange element dust stratification compared with fruit, ensure that equipment reliability service.
Description
Technical field
The present invention relates to coal-fired power generation fields, specifically, being related to a kind of based on the accurate of Power Plant DCS System gas heat exchanger
Position the control method of purging.
Background technique
Currently, China's Thermal generation unit is all based on greatly DCS (distributed control systems, abbreviation
DCS), the gas-to-gas heat exchanger of Thermal generation unit air preheater and desulfurization original flue gas, neat stress generallys use rotary gas-gas and changes
(effect of Gas Gas Heater, GGH are to be heated the neat stress after desulfurization using former flue gas to hot device GGH, make smoke evacuation temperature
Degree reaches on dew point, mitigates the corrosion to flue and chimney, improves the diffusance of pollutant；It is lowered into absorption tower simultaneously
Flue-gas temperature, reduce in tower to corrosion-resistant process specifications), because dust in tail flue gas etc. is stagnant by dust when heat exchange
It stays on heat exchange element, will cause heat exchanger blocking and differential pressure is caused to become larger, its steam used purges online at present, control system
Design purge part heat exchange element cannot effectively and cause blockage problem only from boiler sootblowing steam angle of coverage.The design
It has fully considered all types of sport car situations of live soot blowing executing agency, the method that heat exchange element vertically purges entirely has been realized, to raising
Purging effect has a very important significance.
Summary of the invention
The present invention is precisely in order to the one kind for solving above-mentioned technical problem and designing is accurate based on Power Plant DCS System gas heat exchanger
Position the control method of purging.
The technical solution adopted by the present invention to solve the technical problems is:
As shown in Figure 1, foring a purging covering of the fan from nozzle to heat exchange element boiler sootblowing steam, purging effect is preferably
The purging part of face within the scope of nozzle diameter being greater than nozzle diameter situation because there is the benchmark step pitch of used sport car, there is portion
Part heat exchange element by blow-through, is not had some limitations using fixed point purging, therefore, to be adopted in a period of time
Realize that its precise positioning purges with X cycle purge mode, when method is the purging that second arrives X time, to blow device
The first step that the first step of the forward or backward of sport car is recycled than upper one increases S*1/X, and step 2 presses benchmark step pitch S to N step
It moves forward or back, so analogizes, after a period, purged by X times, each heat exchange element can receive steaming in plane
The number X of the vertical purging of vapour, purging is related with the benchmark step pitch and nozzle diameter of sport car.
Its design the following steps are included:
(1) virtual feedback designs, and realizes that stopping is moved back in stepping, step.
DEVICE function based on DCS system, after moving forward or back instruction sending, after executing agency enters position or falls back on position
Feedback signal issues, and DEVICE is connected to this to be stopped after signal in place, is based on this function, designs in advance and retrogressing and virtually arrive
Position signal realizes that control is moved back in the stepping in the process of soot blower sport car or step.
Virtual feedback design.Virtual feedback, which is used into or moved back, to be instructed through time delay module after delay time t, and a void is generated
Intend signal as feedback signal, delay time, t was as follows.
T=T-t2 (1)
t>t1 (2)
Wherein, T is benchmark step pitch S journey time, and instruction hair is moved back in the control stepping or step from the manipulator module of DCS system
" 1 " out, after the t1 time, contactor closure connects sport car electrical source of power, which passes through time delay module and simultaneously in delay
Between t generate virtual feedback signal, the signal by manipulator module feedback pin receive after, the manipulator module output order " 1 "
It is " 0 " by involution, contactor separating brake disconnects sport car electrical source of power, and the when a length of T of the process, time T pass through test DCS output
Relay tip on DO plate is closed into the interval time acquisition that contactor separating brake disconnects electrical source of power, and unit is the second；T1 is to connect
The duration that tentaculum reclosing command is closed after issuing to contactor, unit is the second；T2 is to disconnect after virtual feedback generates to contactor
Duration, unit is the second；T1, t2 are actual measured value.
(2) precise positioning purging design.
1. benchmark step pitch calculates
By actual measurement DCS instruction issue after, used contactor can reliably close a floodgate after again separating brake shortest time be base
Quasi- step pitch journey time T, the stroke that sport car is walked after time T are benchmark step pitch S.
(1) benchmark step pitch journey time T:T is benchmark step pitch S journey time, moves back instruction from control stepping or step and issues
" 1 ", after the t1 time, contactor closure connects sport car electrical source of power, which passes through time delay module simultaneously and produce in delay time t
It is received after raw virtual feedback by manipulator module, which is contactor separating brake disconnection sport car power electric after " 0 " by involution
Source, the when a length of T of the process, time T export the relay tip on DO terminal board by test DCS and are closed into control power
The interval time that the contactor of power supply separating brake disconnects obtains.
(2) benchmark step pitch S is calculated: the stroke that the sport car of soot blowing executive device moves after benchmark step pitch journey time T, can
It is obtained by field measurement.
2. accurately purging control design case
Entire GGH heat exchange element is vertically purged to realize, the design is to carry out X circulation in a period of time
It is purged, X times cycle purge is as follows.
X=S/ ￠ -1 (3)
Wherein, X is the purging cycle-index in certain a period of time；S is benchmark step pitch, unit mm；￠ is nozzle diameter,
Unit is mm.；
Its stepping or step move back the mode of realization are as follows:
Purging is that every step pitch is moved back by benchmark step pitch S stepping or step for the first time, until end limits.
Second when purging, the first step away from being S+S*1/X, in second step into N step holding benchmark step pitch S, Zhi Daomo
End limit；Wherein, S+S*1/X is the stroke walked after sport car is out of service after delay time t+t/X generates virtual feedback.
Third time purge when, the first step away from be S+S*2/X, second step to N step in holding benchmark step pitch S, until
End limit；Wherein, S+S*2/X is the walking row that sport car is out of service after delay time t+t*2/X generates virtual feedback
Journey.
So analogize, when X time purges, step pitch is S+S* (X-1)/X, and benchmark step is kept into N step in second step
Away from S, until end limits；Wherein, S+S* (X-1)/X is the sport car after delay time t+t* (X-1)/X generates virtual feedback
Running stroke out of service；After the completion of this purging, purging is completed in the period.
The control method based on Power Plant DCS System gas heat exchanger precise positioning purging, benchmark step pitch S is that soot blowing is held
The stroke that the sport car that luggage is set moves after minimum step journey time T, the benchmark step pitch S is by used sport car movement speed
The delay time t for generating virtual feedback with setting is determined.
(3) every step stops variable purge time control
Each purge time fixed value is that rotary GGH gas-to-gas heat exchanger rotation lap time (passes through field measurement
Obtain the time), for guarantee purging effect, design a stop purge time multiple setting apparatus, be supplied to operations staff according to
The practical dust stratification situation that results in blockage changes multiple, increases fixed point purge time (normal design be fixed value 1), strong with enhancing purging
Degree.
The control method based on Power Plant DCS System gas heat exchanger purge system puts into soot blower system and automatically controls
Afterwards, realize carry out whithin a period of time X time purging, can also manual mode carry out X times and purge, system according to the X set, prolong
When time, step between stop purge time, start to carry out soot blowing after system determines that each soot blowing condition has, realize between a time
Vertical purging comprehensively is carried out every interior exchange thermal element, solution fixed point purging is unable to get for a long time there are part heat exchange element vertically to be blown
It sweeps and results in blockage, cause the big problem of differential pressure before and after heat exchanger, this method devises by adjusting the duration control of purging interval, real
Different zones purging Strength Changes control in present purging circulation.
The beneficial effects of the invention are as follows precisely being pinpointed suitable for the control of various soot blower system sport cars, heat exchange element is carried out
Complete vertical steam soot blowing, which considers sport car control precision, and provides the selection of a variety of soot-blowing modes, for operation
Personnel provide the mode of flexibility and reliability, provide support to improve operation and management level, stablize to the safety economy for improving unit
Operation is of great significance.
Detailed description of the invention
Fig. 1 is that GGH heat exchanger soot-blowing control of the present invention becomes purging point number X=2 control figure.
Fig. 2 is that soot blower sport car of the present invention step moves back control configuration figure.
Fig. 3 is that the delay time of step pitch stroke of the present invention controls configuration figure.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Fig. 2, the present invention is based on the control method of Power Plant DCS System gas heat exchanger purge system, including following step
It is rapid:
(1) it is generated after virtual feedback is delayed, realizes that step moves back stopping.
1. control strategy
Virtual feedback design.Virtual feedback, which is used into or moved back, to be instructed through time delay module after delay time t, and a void is generated
Intend signal as feedback signal, delay time, t was as follows.
T=T-t2 (1)
t>t1 (2)
Wherein, T is benchmark step pitch S journey time, and instruction hair is moved back in the control stepping or step from the manipulator module of DCS system
" 1 " out, after the t1 time, contactor closure connects sport car electrical source of power, which passes through time delay module and simultaneously in delay
Between t generate virtual feedback signal, the signal by manipulator module feedback pin receive after, the manipulator module output order " 1 "
It is " 0 " by involution, contactor separating brake disconnects sport car electrical source of power, and the when a length of T of the process, time T pass through test DCS output
Relay tip on DO plate is closed into the interval time acquisition that contactor separating brake disconnects electrical source of power, and unit is the second；T1 is to connect
The duration that tentaculum reclosing command is closed after issuing to contactor, unit is the second；T2 is to disconnect after virtual feedback generates to contactor
Duration, unit is the second；T1, t2 are actual measured value.
2. embodiment
Such as Fig. 2, after 001 receives sequence instruction, soot blower sport car proceeds to end position, starts to purge, and purges a purging
After period (it is related with setting multiple that it purges duration), 001 module " DMd2 " pin, which receives room for manoeuvre requirement and issues room for manoeuvre, to be referred to
It enables, while 003 Postponement module receives the command information, the delay time of 003 Postponement module is controlled by 002 module, by prolonging
When time t after, generate virtual feedback signal through 004 with module, 005 pulse module, 006 or module after, be sent to 001 module
" FB2 " feedback pin, involution stop instruction complete a room for manoeuvre instruction and are issued to room for manoeuvre instruction involution process；Using one
After purge cycles, 001 receives room for manoeuvre again requires and issues room for manoeuvre instruction, so analogizes；It is connected to and actually falls back on position when 001
After signal, a cycle purge is completed.
(2) precise positioning purging design.
1. benchmark step pitch calculates
By actual measurement DCS instruction issue after, used contactor can reliably close a floodgate after again separating brake shortest time be base
Quasi- step pitch journey time T, the stroke that sport car is walked after time T are benchmark step pitch S.
(1) benchmark step pitch journey time T:T is benchmark step pitch S journey time, moves back instruction from control stepping or step and issues
" 1 ", after the t1 time, contactor closure connects sport car electrical source of power, which passes through time delay module simultaneously and produce in delay time t
It is received after raw virtual feedback by manipulator module, which is contactor separating brake disconnection sport car power electric after " 0 " by involution
Source, the when a length of T of the process, time T export the relay tip on DO terminal board by test DCS and are closed into control power
The interval time that the contactor of power supply separating brake disconnects obtains.
(2) benchmark step pitch S is calculated: the stroke that the sport car of soot blowing executive device moves after benchmark step pitch journey time T, can
It is obtained by field measurement.
2. accurately purging control design case
Entire GGH heat exchange element 22 is vertically purged to realize, the design is in a period of time follow for X times
Ring is purged, and X times cycle purge is as follows.
X=S/ ￠ -1 (3)
Wherein, X is the purging cycle-index in certain a period of time；S is benchmark step pitch, unit mm；￠ is that nozzle 21 is straight
Diameter, unit mm..
Its stepping or step move back the mode of realization are as follows:
Purging is that every step pitch is moved back by benchmark step pitch S stepping or step for the first time, until end limits.
Second when purging, the first step away from being S+S*1/X, in second step into N step holding benchmark step pitch S, Zhi Daomo
End limit；Wherein, S+S*1/X is the stroke walked after sport car is out of service after delay time t+t/X generates virtual feedback.
Third time purge when, the first step away from be S+S*2/X, second step to N step in holding benchmark step pitch S, until
End limit；Wherein, S+S*2/X is the walking row that sport car is out of service after delay time t+t*2/X generates virtual feedback
Journey.
So analogize, when X time purges, step pitch is S+S* (X-1)/X, and benchmark step is kept into N step in second step
Away from S, until end limits；Wherein, S+S* (X-1)/X is the sport car after delay time t+t* (X-1)/X generates virtual feedback
Running stroke out of service；After the completion of this purging, purging is completed in the period.
The control method based on Power Plant DCS System gas heat exchanger precise positioning purging, benchmark step pitch S is that soot blowing is held
The stroke that the sport car that luggage is set moves after minimum step journey time T, the benchmark step pitch S is by used sport car movement speed
The delay time t for generating virtual feedback with setting is determined.
Embodiment
Such as Fig. 3, according to benchmark step pitch and 21 aperture of nozzle, it has been determined that the purging number of the present embodiment is X=3.
(1) first soot blowing recycles (X=1).
The selection of first step delay time.The step pitch of first purging circulation is purged by the movement of benchmark step pitch, therefore,
The delay time of the first step is identical as the delay time design of other steps, the method implemented are as follows: when selection carries out steam soot blowing
And it is program-controlled effective in run signal, this 2 signals are " 1 " with output after module through 102,104 pulse counter modules are sent to, when
104 modules are connected to the signal for the first time, and output pin " Y " output is 1, which is sent to 105,106,107 comparison modules respectively,
105 comparison module conditions meet output " 1 ", after being sent to 108 more options module pins " Z1 ", select the of first purging circulation
The delay time of one step is sent to 109 selecting module X1 pins for 0.5.
Before sport car starts the first step of first circulation, sends the delay time t of the first step to and generate prolonging for virtual feedback
When module, implementation method are as follows: carry out steam soot blowing and it is program-controlled run signal effectively through 102 with module output " 1 ", and before
The useful signal in place of limit switch is held to be sent to 113 step-by-step countings after 110 pulse modules, 111 and module, 112 pulse modules
Module exports " 1 ", meets output pin " D " through 119 comparison module Rule of judgment and is sent after for 1 to the pin of 109 selecting modules
" Z ", 109 selected the numerical value 0.5 of module pin " X1 " to be sent to 101 after be then sent through generate virtual feedback time delay module delay
Time pin, that is, the delay time to regress in the preset in advance first step.
The delay time setting that second step is walked to N, implementation method are as follows: after issuing first step control instruction, the letter
Number through 115 pulse counter modules, 117 comparison modules, 118 delay set modules generate slot signals be sent to 113 pulsimeter digital-to-analogues
Block makes it count reset, is unsatisfactory for 119 comparison module conditions, and output pin is that " 0 " is sent to 109 selecting modules, makes this
109 selecting module output pin " Y " numerical value are the numerical value 0.5 of the module pin " X2 ", that is, complete the control of first step stroke
Afterwards, the delay time before second step starts benchmark step pitch stroke is sent to 002 time delay module of Fig. 2 through 101 modules, makes next
A room for manoeuvre stroke is benchmark stroke；When first soot blowing circulation, which regresses, arrives end position (intermediate limit switches signal), refer to moving back
115 pulse counter module involutions are enabled, the delay time for the selection second step of next circulation prepares.
(2) second soot blowings recycle (X=2).
The selection of first step delay time.The first step of the first step of second purging circulation away from than first purging circulation is more
Mobile S*1/X is purged, and therefore, the delay time of the first step has increase accordingly t/X, the method implemented are as follows: when again
Selection carry out steam soot blowing and program-controlled effective in run signal, this 2 signals are " 1 " with output after module through 102, are sent to
104 pulse counter modules, when 104 modules are connected to the signal again, output pin " Y " output becomes 2, which is sent to respectively
105,106,107 comparison module, 106 comparison module conditions meet output " 1 ", after being sent to 108 more options module pins " Z2 ", choosing
The delay time for selecting the first step of second purging circulation is sent to 109 selecting module X1 pins for 0.625.
Before the first step for starting mobile second circulation in sport car, it is virtual anti-that the delay time t of the first step is sent to generation
The time delay module of feedback, implementation method are as follows: when again carry out steam soot blowing and it is program-controlled in run signal effectively through 102 it is defeated with module
" 1 " out, and front end limit switch useful signal in place through 110 pulse modules, 111 be sent to after module, 112 pulse modules
113 pulse counter modules export " 1 ", meet output pin " D " through 119 comparison module Rule of judgment and are sent after for 1 to 109 selection moulds
The pin " Z " of block, 109 selected the numerical value 0.625 of module pin " X1 " to be sent to 101 after be then sent through generate virtual feedback delay
The delay time pin of module, that is, the delay time to regress in the preset in advance first step.
The delay time setting that second step is walked to N, implementation method are as follows: after issuing first step control instruction, the letter
Number through 115 pulse counter modules, 117 comparison modules, 118 delay set modules generate slot signals be sent to 113 pulsimeter digital-to-analogues
Block makes it count reset, is unsatisfactory for 119 comparison module conditions, and output pin is that " 0 " is sent to 109 selecting modules, makes this
109 selecting module output pin " Y " numerical value are the numerical value " 0.5 " of the module pin " X2 ", that is, complete the control of first step stroke
After system, the delay time before second step starts benchmark step pitch stroke is sent to 002 time delay module of Fig. 2 through 101 modules, under making
One room for manoeuvre stroke is benchmark stroke；When second soot blowing circulation regresses to end position (intermediate limit switches signal), moving back
115 pulse counter module involutions are instructed, the delay time for the selection second step of next circulation prepares.
(2) third soot blowing circulation (X=3).
The selection of first step delay time.The first step of the first step away from than second purging circulation of third purging circulation is more
Mobile S*1/X is purged, that is, moves the first step of the first step away from than first purging circulation of third purging circulation more
Dynamic S*2/X is purged, and therefore, the delay time of the first step has increase accordingly t*2/X, the method implemented are as follows: when the 3rd time
Selection carries out steam soot blowing and program-controlled effective in run signal, this 2 signals are " 1 " with output after module through 102, is sent to 104
Pulse counter module, when 104 modules are connected to the signal again, output pin " Y " output becomes 3, which is sent to respectively
105,106,107 comparison module, 107 comparison module conditions meet output " 1 ", after being sent to 108 more options module pins " Z3 ", choosing
The delay time for selecting the first step of third purging circulation is sent to 109 selecting module X1 pins for 0.75.
Before the first step for starting mobile third circulation in sport car, it is virtual anti-that the delay time t of the first step is sent to generation
The time delay module of feedback, implementation method are as follows: when again carry out steam soot blowing and it is program-controlled in run signal effectively through 102 it is defeated with module
" 1 " out, and front end limit switch useful signal in place through 110 pulse modules, 111 be sent to after module, 112 pulse modules
113 pulse counter modules export " 1 ", meet output pin " D " through 119 comparison module Rule of judgment and are sent after for 1 to 109 selection moulds
The pin " Z " of block, 109 selected the numerical value 0.75 of module pin " X1 " to be sent to 101 after be then sent through generate virtual feedback delay
The delay time pin of module, that is, the delay time to regress in the preset in advance first step.
The delay time setting that second step is walked to N, implementation method are as follows: after issuing first step control instruction, the letter
Number through 115 pulse counter modules, 117 comparison modules, 118 delay set modules generate slot signals be sent to 113 pulsimeter digital-to-analogues
Block makes it count reset, is unsatisfactory for 119 comparison module conditions, and output pin is that " 0 " is sent to 109 selecting modules, makes this
109 selecting module output pin " Y " numerical value are the numerical value " 0.5 " of the module pin " X2 ", that is, complete the control of first step stroke
After system, the delay time before second step starts benchmark step pitch stroke is sent to 002 time delay module of Fig. 2 through 101 modules, under making
One room for manoeuvre stroke is benchmark stroke；When third soot blowing circulation regresses to end position (intermediate limit switches signal), moving back
115 pulse counter module involutions are instructed, the delay time for the selection second step of next circulation prepares.
Originally after circulation terminates, 107 comparison module pins " D=1 " and " the program-controlled blowing beam of soot blowing " signal are effectively through 103 and mould
Block calculates, and send to 104 pulse counter module pins " Rst ", which exports " Y=3 " by reset after involution.
When starting the soot blowing of next period, the circulation will be executed again.
(3) every step stops variable purge time control
1. purging strength control
This method, which mainly passes through, increases purge time method: each purge time fixed value is that rotary gas-gas is changed
Hot device rotates lap time (obtaining the time by field measurement), to guarantee purging effect, designs a time multiple setting
Device is provided as operations staff according to the practical dust stratification situation that results in blockage and changes multiple, and increasing fixed point purge time, (normal design is
Fixed value 1), which can change in purge, to reinforce the purging intensity of any region.
2. embodiment
Time setting, implementation method are as follows: according to fig. 2, operations staff can blow 015 setting module by operation screen
The setting of flyback time multiple, the value with purge cycles after 013 multiplier module is multiplied, set by the delay as 016 delay set module
The position time.
The time moves back the judgement of instruction as being again started up.Its implementation method are as follows: be low electricity by the room for manoeuvre instruction of involution
Flat " 0 ", is high level " 1 " through 012 non-module, which is sent to 016 delay set module, the 016 delay set module
Delay time is purge time, when delay setting time condition meets, sends out high level signal through more than 017 or module, 018 or mould
After block, 001 operation module is sent to as the signal that regresses again, 001 operation module is made to issue room for manoeuvre instruction again.
The present invention is not limited to above-mentioned preferred forms, anyone obtain under the inspiration of the present invention other it is any with
The identical or similar product of the present invention, is within the scope of the present invention.
Claims (3)
1. a kind of control method based on Power Plant DCS System gas heat exchanger precise positioning purging, including dcs
DCS, rotary gas-to-gas heat exchanger, soot blower and step-by-step control system, sport car is mobile with nozzle (21), and nozzle (21) is right
Quasi- heat exchange element (22) purging；It is characterized by: increasing step-by-step control system in power plant dcs DCS, control
The sport car made in rotary gas-to-gas heat exchanger precisely moves, and so that nozzle (21) is directed at each heat exchange element (22) and carries out steam
Purging carries out vertical steam blowing to entire rotary gas-to-gas heat exchanger heat exchange element to realize, uses in a time
Divide X circulation in section and X-1 integral shift mode is carried out to purging point, realizes the complete of each point in entire plane and vertically blow
It sweeps, X times cycle purge is as follows；
Wherein, X is the purging cycle-index in certain a period of time；S is benchmark step pitch, unit mm；For nozzle diameter, unit
For mm.；
Its stepping or step move back the mode of realization are as follows:
Purging is that every step pitch is moved back by benchmark step pitch S stepping or step for the first time, until end limits；
Second when purging, and the first step keeps benchmark step pitch S into N step away from being S+S*1/X, in second step, until end limit
Position；Wherein, S+S*1/X is the stroke walked after sport car is out of service after delay time t+t/X generates virtual feedback；
Third time purge when, the first step away from be S+S*2/X, second step to N step in holding benchmark step pitch S, until end
Limit；Wherein, S+S*2/X is the running stroke that sport car is out of service after delay time t+t*2/X generates virtual feedback；
So to analogize, when X time purges, step pitch is S+S* (X-1)/X, benchmark step pitch S is kept into N step in second step,
Until end limits；Wherein, S+S* (X-1)/X is that sport car stops after delay time t+t* (X-1)/X generates virtual feedback
The running stroke of operation；After the completion of this purging, purging is completed in the period；
Wherein, virtual feedback, which is used into or moved back, instructs through time delay module after delay time t, generates a virtual signal as anti-
Feedback signal, delay time, t was as follows；
T=T-t2 [1]
t>t1 [2]
Wherein, T is benchmark step pitch S journey time, and the control stepping or step from the manipulator module of DCS system are moved back instruction and issued
" 1 ", after the t1 time, contactor closure connects sport car electrical source of power, which passes through time delay module and simultaneously in delay time t
Virtual feedback signal is generated, after which is received by manipulator module feedback pin, which is answered
It is classified as " 0 ", contactor separating brake disconnects sport car electrical source of power, and the when a length of T of the process, time T export DO plate by test DCS
On relay tip be closed into contactor separating brake disconnect electrical source of power interval time obtain, unit is the second；T1 is contactor
The duration that reclosing command is closed after issuing to contactor, unit is the second；T2 be virtual feedback generate after to contactor disconnect when
Long, unit is the second；T1, t2 are actual measured value.
2. the control method according to claim 1 based on Power Plant DCS System gas heat exchanger precise positioning purging, feature
Be: benchmark step pitch S is the stroke that the sport car of soot blowing executive device moves after minimum step journey time T, benchmark step pitch S
It is determined by the delay time t that used sport car movement speed and setting generate virtual feedback.
3. the control method according to claim 1 based on Power Plant DCS System gas heat exchanger precise positioning purging, feature
Be: every step stops purge time and is controlled by step-by-step control system, and duration is variable；Each purge time fixed value is revolution
Formula gas-to-gas heat exchanger rotates lap time, and step-by-step control system has a stop purge time multiple setting apparatus, and operations staff can
According to practical dust stratification result in blockage situation change multiple, increase fixed point purge time, to enhance purging intensity.
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