CN104296156B - A kind of method and system of desulfurization fume heat exchanger RB - Google Patents
A kind of method and system of desulfurization fume heat exchanger RB Download PDFInfo
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- CN104296156B CN104296156B CN201310306463.6A CN201310306463A CN104296156B CN 104296156 B CN104296156 B CN 104296156B CN 201310306463 A CN201310306463 A CN 201310306463A CN 104296156 B CN104296156 B CN 104296156B
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 172
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Abstract
The invention discloses the method and system of a kind of desulfurization fume heat exchanger RB.Described method includes: set the trigger condition of desulfurization fume heat exchanger RB；When meeting the trigger condition of described desulfurization fume heat exchanger RB, by unit cooperative system by stove with machine state is switched to machine following state, open desulfurization accident spray equipment, the desulfurization fume heat exchanger RB target load of setting and load reduction of speed rate are placed to the load loop of described unit cooperative system, and according to the number of units of the coal pulverizer running, carry out the coal pulverizer that trips, corresponding for described desulfurization fume heat exchanger RB target load fuel value is delivered to boiler master as fuel command, to avoid the unplanned outage of unit simultaneously.The present invention is by designing new desulfurization fume heat exchanger RB function, it is achieved desulfurizer and boiler host synchronization, long-term, stable operation, greatly reduces the generation of the unit unplanned outage causing due to desulfurization fume heat exchanger full cut-off fault.For ensureing that unit safety operation, minimizing unit unplanned outage number of times have decisive meaning, the unit safety of Power Plant Side and the power supply safety of grid side are all played an important role.
Description
Technical field
The present invention relates to technical field of electric power, particularly relate to the flue gas desulfurization technique field in power technology,
It is concretely the method and system of a kind of desulfurization fume heat exchanger RB.
Background technology
Require to implement refinement as Chinese Ministry of Environmental Protection " 12 " reduces discharging, persistently advance the total amount of pollutant to reduce discharging work
Make, for reducing the discharge of pollutant, improve Thermal generation unit synthesis desulfurating denitration efficiency, it is desirable to combustion
Coal-fired plant's desulphurization system flue duct bypass implements thoroughly closure, and therefore desulfurization duct bypass closure work is for respectively
Genco is imperative.Simultaneously this year Chinese Ministry of Environmental Protection and each Bureau of Environmental Protection of Shanxi Province each file in emphasizing repeatedly
The deadline of Desulphurization for Coal-fired Power Plant bypass closure, coal-burning power plant faces directly as emphasis emission reduction units
Pressure.
Flue gas heat-exchange unit (Gas Gas Heater, hereinafter referred to as GGH) is non-in power plant desulphurization system equipment
One of often important equipment, it utilizes former flue gas to heat the neat stress after desulfurization, makes exhaust gas temperature
Reach on dew point, the former flue-gas temperature in absorption tower can be lowered into, reduce absorption tower water consumption；All right
Improve neat stress temperature, slow down absorption tower downstream installation corrosion, favourable smoke stack emission mouth plume rise, cigarette
Gas spreads and reduces white cigarette phenomenon.Due to former flue gas in GGH by about 130 DEG C be reduced to acid dew point with
Under 80 DEG C, therefore the hot side at GGH can produce the concentrated acid liquid of substantial amounts of thickness.These acid solutions are not only
Very strong corrosiveness is had to the heat exchange element and housing of GGH, and flying in a large amount of flue gas can be adhered to
Ash.In addition, after the small slurry droplet passing through demister evaporates on the surface of heat exchange element, also can
Form the foulant of solid.These solids above-mentioned can block the passage of heat exchange element, the fouling of GGH,
Corrosion and blocking have become as FGD(Flue Gas Desulfurization, flue gas desulfurization technique) system
One of significant trouble, has a strong impact on the safe operation of FGD system and main frame.
As a example by each power plant desulphurization system fault analysis of certain genco, statistics show: nearly five
Year causes by-pass damper to open totally 190 times due to desulphurization system fault；Wherein booster fan fault 69 times,
Account for 36.3%；GGH fault causes by-pass damper to open totally 75 times, accounts for 39.5%；By to certain system
The analysis of statistical results discovery of interior power plant, owing to desulphurization system GGH fault causes desulphurization system to stop transport
Ratio is of a relatively high, reaches 39.5%.And existing control program, unit can be caused when GGH fault
MFT, so that unit unplanned outage number of times is greatly increased.And the unplanned outage of unit is to power plant
For be one of power plant safety reliability index management important indicator, unplanned outage be safety ask
Topic, is also economic problems, electric quantity loss that unplanned outage brings, equipment rehabilitation expense, fuel oil consumption,
Service life of equipment loss etc. all can cause loss economically to Generation Side, for five big electricity power groups
Operation safety management for, the unplanned outage of Power Plant is all necessary from level of factory leader to responsibility employee
Examined.For grid side, electrical network has been enter into the bulk power grid large-sized unit epoch, and large-sized unit is reliable
Property height directly influence the safe and stable operation of electrical network, the operational reliability level improving large-sized unit is electricity
The common objective of Wang Wang factory both sides, the unexpected shutdown of especially newly-built 600MW or 1000MW unit,
The frequency fluctuation of unit place electrical network can be caused, affect the safety and stability of electrical network.
RB(Runback, fast cutback function, hereinafter referred to as RB) test function is as whole-process automatic
Do not allow the automatic control system of manual intervention, it be undertake the Important Auxiliary equipment equipment of generating set such as give,
Air-introduced machine, primary air fan, coal pulverizer or feed pump quickly reduce during arbitrary fault trip unit load,
And make unit load adapt with the peak load that still can undertake at the subsidiary engine equipment running and realize
The control of RB process.The setting of RB project be the difference according to machine set type, trip device difference and
Depending on the difference of operating condition, for thermal power plant's typical case's unit, typically contain following items: feed pump
RB, stove water pump RB, coal pulverizer RB, primary air fan RB, send air-introduced machine RB.
Before not blocking in desulfurization bypass, in desulphurization system, the stoppage in transit of visual plant can be de-by opening
Sulphur bypass realizes the off-the-line of desulphurization system and host computer system, and i.e. in desulphurization system, the stoppage in transit of visual plant will not
Having influence on the shutdown of main frame, therefore unit RB function is concentrated mainly in the Important Auxiliary equipment of main frame, but desulfurization
After bypass closure, the stoppage in transit of visual plant in desulphurization system also can trigger the stoppage in transit of main frame, therefore RB function
Also desulphurization system should be progressively extended to, using the main frame after desulfurization bypass closure and desulfurization island as integrated
Overall consideration and design.
According to national " 12 " planning, national environmental protection portion file requires to cancelling desulfurization duct bypass
Just issuing, therefore experimental stage is all being groped by company of each electricity power group, domestic also do not shape be
System modification Experience.In this context, the usual way of each genco is owing to a variety of causes stops as GGH
Directly triggering boiler main fuel trip action when spline is moved, direct blowing out is shut down, and off-the-line desulphurization system.Cancel de-
After sulphur bypass, the flue gas of boiler must pass through from desulphurization absorption tower system.Therefore any desulfurization can be caused
System factor out of service, all can cause boiler controller system to trip.These factors include: GGH stoppage in transit,
Deduster is out of service, booster fan trips, slurry circulating pump full cut-off.
From above-mentioned scheme it can be seen that domestic existing technical scheme essence is when GGH is due to various former
Because shutting down and when absorption tower outlet cigarette temperature is high, single for guaranteeing main frame and burner hearth safety, directly by boiler
MFT, i.e. unit main fuel trip, make compressor emergency shutdown.And by desulfurization bypass closure after main frame and
Desulfurization island considers as integrated entirety and design, thus considerably increases the non-number of times stopping of unit, increases
Jia Liao power plant and the risk of electric power netting safe running.
Content of the invention
The embodiment of the present invention provides the method and system of a kind of desulfurization fume heat exchanger RB, to avoid unit
Unplanned outage, it is ensured that the operation of unit.
In order to achieve the above object, the embodiment of the invention discloses the side of a kind of desulfurization fume heat exchanger RB
Method, comprising: set the trigger condition of desulfurization fume heat exchanger RB；When meeting described desulfurization fume heat exchanger
During the trigger condition of RB, by unit cooperative system by stove with machine state is switched to machine following state, open de-
Desulfurization fume heat exchanger RB target load and the load reduction of speed rate of setting are placed to by sulphur accident spray equipment
The load loop of described unit cooperative system, and according to the number of units of the coal pulverizer running, carry out the coal-grinding that trips
Corresponding for described desulfurization fume heat exchanger RB target load fuel value is delivered to as fuel command by machine simultaneously
Boiler master, to avoid the unplanned outage of unit.
Further, in one embodiment, the trigger condition of described desulfurization fume heat exchanger RB includes: institute
The actual load stating desulfurization fume heat exchanger is not less than described desulfurization fume heat exchanger RB target load；Described
Desulfurization fume heat exchanger stops；And described unit cooperative system has put into stove with machine state.
Further, in one embodiment, the described number of units according to the coal pulverizer running, carries out tripping operation mill
The jump mill principle of coal machine is: no-delay jump runs coal pulverizer the superiors mill, to be spaced the reality of 5S by up to
Lower order trips other coal pulverizers finally retain three coal pulverizers of the bottom and run, and jumps is ground instruction send
To Boiler Furnace Safeguard Supervisory System.
Further, in one embodiment, described method also includes: when desulfurization fume heat exchanger RB triggers
After, if unit actual load meets with described desulfurization fume heat exchanger RB target load difference is less than preset difference
Value or operations staff's hand resetting, then trigger desulfurization fume heat exchanger RB involution, standby to put into
Desulfurization fume heat exchanger works.
In order to achieve the above object, the embodiment of the invention also discloses a kind of desulfurization fume heat exchanger RB is
System, including PLC, Boiler Furnace Safeguard Supervisory System, desulfurization DCS system and unit cooperative
System；
Wherein, described PLC and described Boiler Furnace Safeguard Supervisory System, desulfurization DCS system with
And unit cooperative system is connected；
Described PLC sets the trigger condition of described desulfurization fume heat exchanger RB, described when meeting
During the trigger condition of desulfurization fume heat exchanger RB, control described unit cooperative system by stove with machine state switches
To machine following state, and control the desulfurization accident spray system opened in described desulfurization DCS system；
Described PLC sets desulfurization fume heat exchanger RB target load and load reduction of speed rate, when completely
During the trigger condition of the described desulfurization fume heat exchanger RB of foot, described desulfurization fume heat exchanger RB target is born
Lotus and load reduction of speed rate are placed to the load loop of described unit cooperative system, and control described boiler furnace
Safety monitoring system, according to the number of units of the coal pulverizer running, carries out the coal pulverizer that trips, by described desulfurization fume
The corresponding fuel value of heat exchanger RB target load delivers to boiler master as fuel command.
Further, in one embodiment, the desulfurization fume heat exchanger RB that described PLC sets
Trigger condition include: the actual load of described desulfurization fume heat exchanger be not less than described desulfurization fume heat exchange
Device RB target load；Described desulfurization fume heat exchanger stops；And described unit cooperative system puts into
Stove is with machine state.
Further, in one embodiment, the described boiler furnace security monitoring of described PCL controller control
System according to the number of units of the coal pulverizer running, the jump mill principle carrying out tripping operation coal pulverizer is: no-delay jump is transported
Row coal pulverizer the superiors mill, trips other coal pulverizers finally protecting with the reality order from top to bottom being spaced 5S
Stay three coal pulverizers of the bottom to run, and Boiler Furnace Safeguard Supervisory System is delivered in jump mill instruction.
Further, in one embodiment, described PLC is additionally operable to as desulfurization fume heat exchanger RB
After triggering, if unit actual load and described desulfurization fume heat exchanger RB target load difference meet less than in advance
When putting difference, trigger desulfurization fume heat exchanger RB involution, to put into standby desulfurization fume heat exchanger work.
Further, in one embodiment, described PLC also includes involution button, be used for people
Work hand resetting, to trigger the artificial involution of desulfurization fume heat exchanger RB, standby to put into
Desulfurization fume heat exchanger works.
The method and system of the desulfurization fume heat exchanger RB of the embodiment of the present invention have the advantages that logical
Cross and design this new desulfurization fume heat exchanger RB function, by desulfurization main equipment with host groups equipment according to together
The standard of sample and requirement are controlled and safeguard, avoid by desulfurization when desulfurization fume heat exchanger fault stops
Road baffle plate is removed and runs, to Thermal generation unit, the negative effect bringing after flue closure, it is achieved desulfurization fills
Put and boiler host synchronization, long-term, stable operation, greatly reduce owing to desulfurization fume heat exchanger stops
The generation of the unit unplanned outage that fault causes, for guarantee unit safety operation, reduces the non-meter of unit
Draw stoppage in transit number of times and there is decisive meaning, equal to the unit safety of Power Plant Side and the power supply safety of grid side
Play an important role.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
The accompanying drawing executing required use in example or description of the prior art is briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those skilled in the art, not
On the premise of paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the method flow diagram of the desulfurization fume heat exchanger RB of the embodiment of the present invention；
Fig. 2 is the structural representation of the system of the desulfurization fume heat exchanger RB of the embodiment of the present invention；
Fig. 3 is the logical schematic of the present invention one application example desulfurization fume heat exchanger RB；
Fig. 4 is the tripping operation coal pulverizer step of the present invention one application example desulfurization fume heat exchanger RB and the time patrols
Collect schematic diagram；
Fig. 5 is the smoke temperature change conditional curve figure of the present invention one application example.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
The every other embodiment being obtained under the premise of going out creative work, broadly falls into the scope of protection of the invention.
At present, the design of thermal power generation unit typical RB function specifically include that R/B signal triggering,
The switching of unit allocation mode, jump time consuming are multiple with load shedding speed, RB with step, RB target load
Return major part.The design of desulfurization fume heat exchanger RB function equally also includes the content of above-mentioned six functions.Other
After road baffle plate is cancelled, owing to without bypass, the importance of desulphurization system rises, the same with main process equipment,
If after desulphurization system visual plant goes wrong, very big to main frame influence on system operation, and result is exactly machine
The necessary improper stoppage in transit of group, therefore designs new desulfurization fume heat exchanger RB.And design desulfurization fume heat exchange
Device RB it is crucial that need design Site for Unit test judge when the equipment of desulphurization system goes wrong, i.e. when
After desulfurization fume heat exchanger GGH stops transport, whether the change of the temperature of desulphurization system can allow operations staff have
Enough time reflects, if can be reduced the pressure of desulphurization system by reducing sub-load, then again
Control temperature in conjunction with two-stage accident spray, put into a set of standby new desulfurization fume heat exchanger simultaneously and drive
Dynamic device.If said process is controlled, then when desulfurization fume heat exchanger is stopped transport, then without triggering main frame MFT
Action, can trigger newly-designed desulfurization fume heat exchanger RB and unit load drops to desulphurization system energy automatically
In the range of bearing, thus greatly reduce that main frame is non-stops number of times, improve the safe and reliable of desulphurization system simultaneously
Property.
The embodiment of the present invention provides the method and system of a kind of desulfurization fume heat exchanger RB, by various not
It with the selection of operating mode and the Logic judgment under the method for operation and control strategy, is automatically performed the load of unit
Be down to and currently run equipment and allow corresponding target load of exerting oneself, maintain unit major parameter (load,
Flue gas, cigarette temperature) in allowed band, after stable conditions, manually put into the standby dress of a set of GGH increasing
Put, make unit energy continue to run with, thus greatly reduce the non-of unit and stop number of times, it is ensured that the operation of unit.
As it is shown in figure 1, the method flow diagram of the desulfurization fume heat exchanger RB for the embodiment of the present invention, described
Method includes:
Step S101, sets the trigger condition of desulfurization fume heat exchanger RB；
Step S102, when meeting the trigger condition of described desulfurization fume heat exchanger RB, by unit cooperative
System is opened desulfurization accident spray equipment by stove with machine state is switched to machine following state, de-by set
The load that sulphur flue gas heat-exchange unit RB target load and load reduction of speed rate are placed to described unit cooperative system returns
Road, and according to the number of units of the coal pulverizer running, carry out the coal pulverizer that trips, described desulfurization fume is changed simultaneously
The corresponding fuel value of hot device RB target load delivers to boiler master as fuel command, to avoid the non-of unit
Planned outage.
Further, in the present embodiment, the trigger condition of described desulfurization fume heat exchanger RB includes: institute
The actual load stating desulfurization fume heat exchanger is not less than described desulfurization fume heat exchanger RB target load；Institute
State desulfurization fume heat exchanger full cut-off；And described unit cooperative system has put into stove with machine state.
Further, in the present embodiment, the described number of units according to the coal pulverizer running, carries out tripping operation mill
The jump mill principle of coal machine is: no-delay jump runs coal pulverizer the superiors mill, to be spaced the reality of 5S by up to
Lower order trips other coal pulverizers finally retain three coal pulverizers of the bottom and run, and jumps is ground instruction send
To Boiler Furnace Safeguard Supervisory System.
Further, in the present embodiment, described method also includes: when desulfurization fume heat exchanger RB triggers
After, if unit actual load and desulfurization fume heat exchanger RB target load difference meet be less than preset difference or
Person's operations staff's hand resetting, then trigger desulfurization fume heat exchanger RB involution, standby to put into
Desulfurization fume heat exchanger works.
Corresponding to said method embodiment, as in figure 2 it is shown, be the desulfurization fume heat exchange of the embodiment of the present invention
The structural representation of the system of device RB, described system includes:
PLC the 1st, Boiler Furnace Safeguard Supervisory System (Furnace Safety Supervision System,
FSSS) the 2nd, desulfurization DCS system 3 and unit cooperative system 4；Wherein, described PLC 1
It is connected with described Boiler Furnace Safeguard Supervisory System the 2nd, desulfurization DCS system 3 and unit cooperative system 4
Connect；Described PLC 1 sets the trigger condition of described desulfurization fume heat exchanger RB, when meeting
When stating the trigger condition of desulfurization fume heat exchanger RB, control described unit cooperative system 4 by stove with machine state
It is switched to machine following state, and control the desulfurization accident spray system opened in described desulfurization DCS system 3；
Described PLC 1 sets desulfurization fume heat exchanger RB target load and load reduction of speed rate, when meet
During the trigger condition of described desulfurization fume heat exchanger RB, by described desulfurization fume heat exchanger RB target load
It is placed to the load loop of described unit cooperative system 4 with load reduction of speed rate, and control described boiler furnace
Safety monitoring system 2, according to the number of units of the coal pulverizer running, carries out the coal pulverizer that trips, by described desulfurization cigarette
The corresponding fuel value of gas heat exchanger RB target load delivers to boiler master as fuel command.
Further, in the present embodiment, the desulfurization fume heat exchanger RB that described PLC 1 sets
Trigger condition include: the actual load of described desulfurization fume heat exchanger be not less than described desulfurization fume heat exchange
Device RB target load；Described desulfurization fume heat exchanger full cut-off；And described unit cooperative system has put into stove
With machine state.
Further, in the present embodiment, described PCL controller 1 controls described boiler furnace and supervises safely
Ore-controlling Role 2 according to the number of units of the coal pulverizer running, the jump mill principle carrying out tripping operation coal pulverizer is: no-delay
Jump and run coal pulverizer the superiors mill, trip other coal pulverizers to be spaced the reality of 5S order from top to bottom
Retain three coal pulverizers of the bottom eventually to run, and Boiler Furnace Safeguard Supervisory System 2 is delivered in jump mill instruction.
Further, in the present embodiment, described PLC 1 is additionally operable to when desulfurization fume heat exchanger
After RB triggers, if unit actual load and desulfurization fume heat exchanger RB target load difference meet less than in advance
When putting difference, trigger desulfurization fume heat exchanger RB involution, to put into standby desulfurization fume heat exchanger work.
Further, in the present embodiment, described PLC 1 also includes involution button, be used for
Involution manually, to trigger the artificial involution of desulfurization fume heat exchanger RB, standby to put into
Desulfurization fume heat exchanger works.
The technique scheme of the embodiment of the present invention has the advantages that by this new taking off of design
Sulphur flue gas heat-exchange unit RB function, by desulfurization main equipment and host groups equipment according to same standard and require into
Row control and maintenance, avoid desulfurization by-pass damper to remove and flue when desulfurization fume heat exchanger fault stops
Run, to Thermal generation unit, the negative effect that brings after closure, it is achieved desulfurizer and boiler host synchronization,
For a long time, stable operation, greatly reduces owing to desulfurization fume heat exchanger stops the non-meter of unit that fault causes
Draw the generation stopped transport, for guarantee unit safety operation, minimizing unit unplanned outage number of times, there is decision
The meaning of property, all plays an important role to the unit safety of Power Plant Side and the power supply safety of grid side.
Describe in detail below in conjunction with the such scheme to the embodiment of the present invention for the application example:
The GGH device of general power plant only has a set of, and this programme adds a set of stand-by provision, increases newly and adds
The standby daily stoppage in transit state that is in, regular no-load running, can install in time if desired and put in place.And on absorption tower
Entrance increase accident spray equipment, is mainly used under accident condition spray and reduces flue-gas temperature, prevent flue gas
Temperature exceedes the temperature that the anti-corrosion materials such as absorption tower can bear.In GGH device stoppage in transit interlocking unlatching accident
Spray equipment.
GGH stops transport and is distinct from the fluctuation that blower fan RB can cause furnace pressure, simply to desulfurization system
System has an impact, and will not affect greatly main frame and miscellaneous equipment, and its rapidity requirement does not has main frame yet
RB require so fast, main target is to reduce load, reduces exhaust gas volumn, so there is GGH dress
When putting tripping operation RB, load shedding rated design is 300MW/min.
For the unit of 600MW, can be according to Power Plant DCS System existing control subsystem and PLC control
Device processed designs and builds the control logic below figure of desulfurization fume heat exchanger RB the 3rd, shown in 4.Wherein, scheme
The logical schematic that 3 is the present invention one application example desulfurization fume heat exchanger RB；Fig. 4 is that the present invention one should
By tripping operation coal pulverizer step and the time logical schematic of example desulfurization fume heat exchanger RB.
Logic designed in Fig. 3 covers 3 subsystems of power plant, including boiler furnace security monitoring
System (Furnace Safety Supervision System, FSSS), desulfurization DCS system and unit
Coordination system.Use GGH stoppage in transit signal as triggering GGH RB operation condition, according to Actual combustion
Result of the test, the coal pulverizer number of units retaining after the coal pulverizer number of units tripping after determining RB triggering and RB；With
When flue gas flow and flue-gas temperature are determined RB after target load arrange and representated by desulphurization system
Large-sized unit goes out force value, and specific practice is:
1st, the triggering of desulfurization fume heat exchanger RB: when actual load is not less than 300MW and when flue gas changes
When hot device stopping time and unit cooperative system have put into stove with machine state, i.e. trigger flue gas heat-exchange unit RB and send out
Raw.
2nd, the switching of unit allocation mode: flue gas heat-exchange unit RB once triggers, will unit cooperative system
By stove with machine state is switched to machine following state.
The input of the 3rd, desulfurization accident spray system: flue gas heat-exchange unit RB once triggers, i.e. automatically engages de-
Sulphur accident spray system.
4th, RB target load and load shedding speed: flue gas heat-exchange unit RB once triggers, by flue gas heat exchange
Device RB target load 300MW and load reduction of speed rate 300MW/Min are placed to the negative of unit cooperative system
Lotus loop, and corresponding for 300MW load fuel quantity is delivered to boiler master as fuel command.
5th, time consuming and step (as shown in Figure 4) are jumped: flue gas heat-exchange unit RB once triggers, by basis
The number of units of the coal pulverizer of unit operation, the step carrying out tripping operation coal pulverizer, jumping mill principle is: no-delay jump is
Upper strata is ground, and trips other coal pulverizers the final reservation bottom three to be spaced the reality of 5S order from top to bottom
Platform coal pulverizer runs, and jump mill instruction is delivered to Boiler Furnace Safeguard Supervisory System.Table 1 institute specific as follows
Show:
Table 1
6th, RB involution: after flue gas heat-exchange unit RB triggers, unit actual load and R B target load
Difference meets less than 20MW or operations staff's hand-reset (as shown in Figure 3), then flue gas heat-exchange unit
RB involution condition meets.
7th, after flue gas heat-exchange unit RB involution, in principal parameters such as main unit load, combustion chamber draft, flue-gas temperatures
Under stable operating mode, a set of standby new GGH driving means can be put into, make unit can recover normal
Variable load operation under operating mode.
According to above-mentioned design and test data, carry out the flue gas heat-exchange unit RB of reality in certain power plant
Test:
Unit load 600MW before test, five coal pulverizers of A, B, C, D, E run, unit commitment
Coordination mode runs, and load and vapour pressure are stable, is manually stopped transport flue gas heat-exchange unit by power plant operations staff, 3 seconds
Rear triggering flue gas heat-exchange unit RB action:
→ RB is no-delay after occurring triggers the startup of desulfurization accident spray system with maximum rate；
→ unit cooperative control mode is coordinated automatically to be switched to machine by stove with machine and is followed mode, unit load
600MW is down to 300MW with the speed of 300MW/MIN, sets sliding pressure variable Rate
0.21MPa/Min, sets sliding pressure desired value and is down to 14.1MPa from 16.5Mpa, and locking increases machine comprehensive valve
Bit instruction；
After → Boiler Furnace Safeguard Supervisory System RB occurs, no-delay jump E grinds, and is then spaced 10 seconds
Final three (A, B, C) coal pulverizers of the bottom that retain of tripping operation D mill run.
→ RB reset target load is 300MW by experiment calculation.
The all important automatic control systems of → main frame (include giving, air inducing and primary air fan, Stream temperature,
Steam water-level) all keep automatically adjusting state, maintain combustion chamber draft, air output, primary air pressure, drum
Water level, the stablizing of Stream temperature.
Furnace pressure actual value up to 0.17kPa, the minimum-0.78kPa that arrives are all very safe in regulation parameter
Working range in.Flue gas heat-exchange unit RB is manual in the state of host parameter is stablized after triggering 17 minutes
Involution, is put into a set of standby new flue gas heat-exchange unit driving means by operations staff, success of the test.This
The flue-gas temperature conditional curve of embodiment is as shown in Figure 5.As seen from Figure 5, flue gas heat-exchange unit stops it
Before, flue-gas temperature 82 DEG C before accident spray, FGD exports cigarette temperature 50 DEG C, stops transport when flue gas heat-exchange unit and triggers
Flue gas heat-exchange unit RB, after accident spray equipment puts into, after accident spray, flue-gas temperature is down to about 49 DEG C,
And FGD outlet cigarette temperature during whole flue gas heat-exchange unit RB relatively steadily, do not have substantially rising and
Temperature declines phenomenon, illustrates that the function that flue gas heat-exchange unit RB designs serves good systems stabilisation effect.
The method and system of the desulfurization fume heat exchanger RB of the embodiment of the present invention have the advantages that logical
Cross and design this new desulfurization fume heat exchanger RB function, by desulfurization main equipment with host groups equipment according to together
The standard of sample and requirement are controlled and safeguard, avoid by desulfurization when desulfurization fume heat exchanger fault stops
Road baffle plate is removed and runs, to Thermal generation unit, the negative effect bringing after flue closure, it is achieved desulfurization fills
Put and boiler host synchronization, long-term, stable operation, greatly reduce owing to desulfurization fume heat exchanger stops
The generation of the unit unplanned outage that fault causes, for guarantee unit safety operation, reduces the non-meter of unit
Draw stoppage in transit number of times and there is decisive meaning, equal to the unit safety of Power Plant Side and the power supply safety of grid side
Play an important role.
Those skilled in the art are it will also be appreciated that the various illustrative components, blocks listed of the embodiment of the present invention
(illustrative logical block), unit, and step can pass through electronic hardware, computer software, or
Both combinations realize.For clearly showing that the replaceability (interchangeability) of hardware and software,
Above-mentioned various illustrative components (illustrative components), unit and step are universally retouched
State their function.Such function is to realize depending on specifically applying by hardware or software
Design with whole system requires.Those skilled in the art can be able to make for every kind of specific application
Realize described function by various methods, but this realization is understood not to protect beyond the embodiment of the present invention
The scope protected.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general
Processor, digital signal processor, special IC (ASIC), field programmable gate array or its
Its programmable logic device, discrete gate or transistor logic, discrete hardware components, or any of the above described combination
Design realize or operate described function.General processor can be microprocessor, alternatively,
This general processor also can be any traditional processor, controller, microcontroller or state machine.Place
Reason device also can be realized by the combination of computing device, such as digital signal processor and microprocessor,
Multi-microprocessor, one or more microprocessors combine a Digital Signal Processor Core, or any its
Its similar configuration realizes.
The step of the method described in the embodiment of the present invention or algorithm can be directly embedded into hardware, processor
The software module performing or the combination of both.Software module can be stored in RAM memory, sudden strain of a muscle
Deposit, ROM memory, eprom memory, eeprom memory, register, hard disk, can move
In movable magnetic disc, CD-ROM or this area in other any form of storage media.Exemplarily, store
Medium can be connected with processor, so that processor can read information from storage medium, it is possible to
Deposit write information to storage medium.Alternatively, store medium can also be integrated in processor.Processor and
Storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, process
Device and storage medium also can be arranged in the different parts in user terminal.
In one or more exemplary designs, the above-mentioned functions described by the embodiment of the present invention can be
Any combination of hardware, software, firmware or this three realizes.If realized in software, these work(
Can store with on the medium of computer-readable, with one or more instruction or code form be transmitted in electricity
On the readable medium of brain.Computer readable medium include computer storage medium and be easy to so that allow computer program from
The telecommunication media in other places is transferred in one place.Storage medium can be any general or special computer
Can be with the useable medium of access.For example, such computer readable media can include but is not limited to
RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic are deposited
Storage device, or other any may be used for carrying storage with instruct or data structure and other can be general
Or special computer or general or special processor read the medium of the program code of form.Additionally, it is any
Connection can be properly termed computer readable medium, for example, if software is from website station
Point, server or other remote resources are used by a coaxial cable, fiber optic cables, twisted-pair feeder, numeral
Family line (DSL) or with the wireless way for transmittings such as example infrared, wireless and microwave be also contained in defined
Computer readable medium in.Described video disc (disk) and disk (disc) include Zip disk, radium-shine
Dish, CD, DVD, floppy disk and Blu-ray Disc, disk is generally with magnetic duplication data, and video disc is usual
Carry out optical reproduction data with laser.Combinations of the above also may be embodied in computer readable medium.
Particular embodiments described above, is carried out to the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the specific embodiment that the foregoing is only the present invention,
The protection domain being not intended to limit the present invention, all within the spirit and principles in the present invention, done appoint
What modification, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (9)
1. the method for a desulfurization fume heat exchanger RB, it is characterised in that described method includes:
Set the trigger condition of desulfurization fume heat exchanger RB；
When meeting the trigger condition of described desulfurization fume heat exchanger RB, by unit cooperative system by stove with machine
State is switched to machine following state, opens desulfurization accident spray equipment, the desulfurization fume heat exchanger that will set
RB target load and load reduction of speed rate are placed to the load loop of described unit cooperative system, and according to operation
The number of units of coal pulverizer, carry out the coal pulverizer that trips, simultaneously by described desulfurization fume heat exchanger RB target load
Corresponding fuel value delivers to boiler master as fuel command, to avoid the unplanned outage of unit.
2. the method for desulfurization fume heat exchanger RB according to claim 1, it is characterised in that institute
The trigger condition stating desulfurization fume heat exchanger RB includes:
The actual load of described desulfurization fume heat exchanger is born not less than described desulfurization fume heat exchanger RB target
Lotus；
And described desulfurization fume heat exchanger stops；
And described unit cooperative system has put into stove with machine state.
3. the method for desulfurization fume heat exchanger RB according to claim 1, it is characterised in that institute
Stating the number of units according to the coal pulverizer running, the jump mill principle carrying out tripping operation coal pulverizer is:
No-delay jump runs coal pulverizer the superiors mill, and the reality order from top to bottom to be spaced 5S trips other
Coal pulverizer simultaneously finally retains three coal pulverizers operations of the bottom, and jump mill instruction is delivered to boiler furnace safety
Monitoring system.
4. the method for desulfurization fume heat exchanger RB as claimed in claim 1, it is characterised in that
Described method also includes:
After desulfurization fume heat exchanger RB triggers, if unit actual load and described desulfurization fume heat exchanger
RB target load difference meets less than preset difference or operations staff's hand resetting, then trigger desulfurization fume
Heat exchanger RB involution, to put into standby desulfurization fume heat exchanger work.
5. the system of a desulfurization fume heat exchanger RB, it is characterised in that described system includes that PLC is controlled
Device processed, Boiler Furnace Safeguard Supervisory System, desulfurization DCS system, unit cooperative system and standby taking off
Sulphur flue gas heat-exchange unit；
Wherein, described PLC and described Boiler Furnace Safeguard Supervisory System, desulfurization DCS system with
And unit cooperative system is connected；
Described PLC sets the trigger condition of described desulfurization fume heat exchanger RB, described when meeting
During the trigger condition of desulfurization fume heat exchanger RB, control described unit cooperative system by stove with machine state switches
To machine following state, and control the desulfurization accident spray system opened in described desulfurization DCS system；
Described PLC sets desulfurization fume heat exchanger RB target load and load reduction of speed rate, when completely
During the trigger condition of the described desulfurization fume heat exchanger RB of foot, described desulfurization fume heat exchanger RB target is born
Lotus and load reduction of speed rate are placed to the load loop of described unit cooperative system, and control described boiler furnace
Safety monitoring system, according to the number of units of the coal pulverizer running, carries out the coal pulverizer that trips, by described desulfurization fume
The corresponding fuel value of heat exchanger RB target load delivers to boiler master as fuel command.
6. the system of desulfurization fume heat exchanger RB according to claim 5, it is characterised in that institute
The trigger condition stating the desulfurization fume heat exchanger RB that PLC sets includes:
The actual load of described desulfurization fume heat exchanger is born not less than described desulfurization fume heat exchanger RB target
Lotus；
And described desulfurization fume heat exchanger stops；
And described unit cooperative system has put into stove with machine state.
7. the system of desulfurization fume heat exchanger RB according to claim 5, it is characterised in that institute
State the number of units of the coal pulverizer according to operation for the described Boiler Furnace Safeguard Supervisory System of PLC control, enter
The jump mill principle of row tripping operation coal pulverizer is:
No-delay jump runs coal pulverizer the superiors mill, and the reality order from top to bottom to be spaced 5S trips other
Coal pulverizer simultaneously finally retains three coal pulverizers operations of the bottom, and jump mill instruction is delivered to boiler furnace safety
Monitoring system.
8. the system of desulfurization fume heat exchanger RB as claimed in claim 5, it is characterised in that described
PLC is additionally operable to after desulfurization fume heat exchanger RB triggers, if unit actual load is de-with described
When sulphur flue gas heat-exchange unit RB target load difference meets less than preset difference, trigger desulfurization fume heat exchanger
RB involution, to put into described standby desulfurization fume heat exchanger work.
9. the system of desulfurization fume heat exchanger RB as claimed in claim 5, it is characterised in that described
Also include involution button in PLC, be used for involution manually, to trigger desulfurization fume heat exchanger
The artificial involution of RB, to put into described standby desulfurization fume heat exchanger work.
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| JP2008069763A (en) * | 2006-09-11 | 2008-03-27 | Yoshio Sekine | Load setter follow-up boiler-turbine parallel control runback control system |
| CN101482449A (en) * | 2008-01-08 | 2009-07-15 | 浙江省电力试验研究院 | Risk limitation method for fast runback test of thermoelectric generating set |
| CN101609327A (en) * | 2008-06-18 | 2009-12-23 | 浙江省电力试验研究院 | All-working-condition automatic RB control method |
| CN103016379A (en) * | 2012-12-04 | 2013-04-03 | 广东红海湾发电有限公司 | Control method for unbypassed booster fan of desulphurization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57164218A (en) * | 1981-04-01 | 1982-10-08 | Hitachi Ltd | Runback control system for multiple type fuel mixture combustion boiler |
| JPH11287403A (en) * | 1998-04-01 | 1999-10-19 | Mitsubishi Heavy Ind Ltd | Run back control method for boiler and control circuit therefor |
| JPH11294704A (en) * | 1998-04-14 | 1999-10-29 | Mitsubishi Heavy Ind Ltd | Method and circuit for controlling runback of boiler |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008069763A (en) * | 2006-09-11 | 2008-03-27 | Yoshio Sekine | Load setter follow-up boiler-turbine parallel control runback control system |
| CN101482449A (en) * | 2008-01-08 | 2009-07-15 | 浙江省电力试验研究院 | Risk limitation method for fast runback test of thermoelectric generating set |
| CN101609327A (en) * | 2008-06-18 | 2009-12-23 | 浙江省电力试验研究院 | All-working-condition automatic RB control method |
| CN103016379A (en) * | 2012-12-04 | 2013-04-03 | 广东红海湾发电有限公司 | Control method for unbypassed booster fan of desulphurization system |
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