CN203285709U - Auxiliary breakdown load reducing RB device of booster fan in power plant - Google Patents
Auxiliary breakdown load reducing RB device of booster fan in power plant Download PDFInfo
- Publication number
- CN203285709U CN203285709U CN2013202794552U CN201320279455U CN203285709U CN 203285709 U CN203285709 U CN 203285709U CN 2013202794552 U CN2013202794552 U CN 2013202794552U CN 201320279455 U CN201320279455 U CN 201320279455U CN 203285709 U CN203285709 U CN 203285709U
- Authority
- CN
- China
- Prior art keywords
- booster fan
- unit
- fan
- load
- power plant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Regulation And Control Of Combustion (AREA)
Abstract
The utility model provides an auxiliary breakdown load reducing RB device of a booster fan in a power plant. The auxiliary breakdown load reducing RB device comprises a trigger and a DCS controller. The trigger is used for triggering a booster fan RB under the work condition that the booster fan in a unit is in breakdown. The DCS controller is connected to the trigger in a coupling mode and used for lowering loads of the unit to the preset target loads of the booster fan RB corresponding to allowed capacity of currently-operated equipment, meanwhile, at the moment the booster fan trips, a gas flow channel is established by using fully-opening of moving vanes of the booster fan, unplanned outage of the unit is avoided, and operating of the unit is guaranteed. According to the auxiliary breakdown load reducing RB device, the novel function of the booster fan RB is designed, desulfuration main equipment and main unit equipment are controlled and maintained according to the same standards and requests, the negative effects on operation of a coal-fired generating unit due to the facts that a desulfuration by-pass damper is removed and the gas flow channel is plugged in breakdown of the booster fan are avoided, the purpose that desulfuration devices and a boiler main engine operate synchronously and stably for a long time is achieved, and unplanned outages of the unit caused by the breakdown of the booster fan are greatly reduced.
Description
Technical field
The utility model relates to the power technology field, relates in particular to the device of a kind of booster fan runback RB of power plant.
Background technique
Along with reducing discharging, Chinese Ministry of Environmental Protection " 12 " requires to implement refinement, continue to advance total amount of pollutant emission reduction work, for reducing the discharging of pollutant, improve coal fired power generation unit synthesis desulfurating denitration efficiency, requirement is implemented thorough shutoff to Desulphurization for Coal-fired Power Plant system flue duct bypass, so desulfurization duct bypass shutoff work is imperative for each genco.Simultaneously this year Chinese Ministry of Environmental Protection and each Bureau of Environmental Protection of Shanxi Province each file in repeatedly deadline of having emphasized Desulphurization for Coal-fired Power Plant bypass shutoff, coal-burning power plant reduces discharging unit as emphasis and faces direct pressure.
For domestic generally adopt with for the wet desulfurization system of spray tower, after desulfurization bypass shutoff transformation, the structure of air and flue system can be divided into the reservation booster fan and cancel these two kinds of booster fan and dilatation induced draught fans, and following this paper Main Analysis is applicable to the type with booster fan.
The desulfurization bypass flue is actually an important passage that forms main frame and desulfurization island operation, when former desulphurization system with gas bypass the time, significantly can keep by opening bypass the normal operation of host machine part under varying duty and extreme failure condition, realize the decoupling zero in desulfurization island and main frame operation, at utmost reduce the impact of desulfurization island fault on main frame; After the shutoff of desulfurization bypass flue, desulfurizer and host groups become the production system of series connection, not only rely on the induced draught fan that send of main frame to control to the very important combustion chamber draft of Host Security operation, largely depend on the control characteristic with the large air and flue system that send induced draught fan-booster fan to form, thereby greatly increased the non-number of times that stops of unit.Take each power plant desulphurization system fault analysis of Shenhua state grey hair electricity company as example, statistics show: opened totally 190 times because the desulphurization system fault causes by-pass damper in nearly 5 years; Wherein the booster fan fault is 69 times, accounts for 36.3%; GGH (Gas Gas Heater, flue gas heat-exchange unit) fault causes by-pass damper unlatching totally 75 times, accounts for 39.5%; Other equipment failures of desulphurization system cause by-pass damper unlatching totally 26 times, account for 13.7%; By-pass damper loss signal 13 times, account for 6.8%; DCS (Distributed Control Systems, decentralized control system) fault 4 times, account for 2.1%; The absorption tower line with rubber comes off 3 times, accounts for 1.6%.
Find by the analysis of statistical results to power plant in state China system, the ratio that causes desulphurization system to stop transport due to desulphurization system booster fan fault is relatively high, reaches 36.3%.According to existing scheme, these No. 69 booster fan faults all can cause unit MFT (Main Fuel Trip, main burning tripping operation), thereby the unplanned stoppage in transit number of times of unit is increased greatly.The unplanned stoppage in transit of unit is to be an important indicator in power plant safety reliability index management for power plant, unplanned stoppage in transit is safety problem, also economic problems, the electric quantity loss that unplanned stoppage in transit brings, equipment rehabilitation expense, fuel consume, service life of equipment loss etc. all can cause loss economically to Generation Side, for the safe operation management of five large electricity power groups, the unplanned stoppage in transit of Power Plant all must be examined to the responsibility employee from the level of factory leader.With regard to grid side; electrical network has entered the large unit epoch of large electrical network; large unit operation reliability height directly has influence on the safe and stable operation of electrical network; the operational reliability level that improves large unit is the electrical network net both sides' of factory common objective; the unexpected shutdown of especially newly-built 600MW or 1000MW unit; can cause the frequency fluctuation of unit place electrical network, affect the safety and stability of electrical network.
According to " 12 " planning of country, national environmental protection section file requires just to issue to cancelling the desulfurization duct bypass, so experimental stage is all being groped, the domestic system reform experience that also there is no shaping by each company of electricity power group.Under this background, if the common way of each genco is directly to trigger boiler MFT after the booster fan disorderly closedown, directly blowing out is shut down.After cancelling the desulfurization bypass, the flue gas of boiler must pass through from desulphurization absorption tower system.Therefore any factor that can cause that desulphurization system is out of service, all can cause the boiler unit tripping.These factors have: dust collector efficiency is poor, deduster is out of service, booster fan trip protection, slurry circulating pump full cut-off.Take the modification scheme of power plant of Datang electricity power group as example:
Explicitly call in " China Datang Power Group Corporation's desulfurization fume bypass shutoff (or dismounting) management guidance suggestion (trying) ": " (one) desulphurization system trips into main protection of boiler, triggers MFT.The desulphurization system tripping operation triggers boiler MFT condition:. the booster fan tripping operation triggers boiler MFT, excises simultaneously the booster fan movable vane automatic, concurrent pulse command standard-sized sheet booster fan movable vane." Datang Hu County improved logical scheme of power plant desulfurization bypass shutoff is: booster fan tripping operation interlocking send, fan trip, boiler MFT, MFT afterload 15MW, the automatic standard-sized sheet of booster fan stator, ventilate and close after 15 minutes simultaneously.
Can find out from above-mentioned scheme, domestic existing technological scheme essence is when booster fan is shut down due to a variety of causes, and single for guaranteeing main frame and burner hearth safety, directly with boiler MFT, namely the unit main fuel trip, make compressor emergency shutdown.And not with by the air and flue system that gives induced draught fan and booster fan to form, as integrated integral body, being considered and design after desulfurization bypass shutoff, thereby greatly increased the non-number of times that stops of unit, increased the risk of power plant and electric power netting safe running.
In realizing the utility model process, model utility people finds that in prior art, there are the following problems at least: because the transformation of the desulfurization bypass flue shutoff of carrying out from 2010 there is no full ripe design and case study on implementation thermal control Optimization Experience is used for reference, also, without corresponding technical standard, relevant work flow process and standard support, lack long-term risk and estimate; After the desulfurization transformation, need to adapt to the new method of operation, desulphurization system significance increases suddenly, and present related domain does not still have the concrete scheme of a cover booster fan RB of power plant,, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit.
The model utility content
The utility model embodiment provides the device of a kind of booster fan runback RB of power plant,, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit.
In order to reach above-mentioned technical purpose, the utility model embodiment provides the device of a kind of booster fan runback RB of power plant, and described device comprises:
Trigger, be used for triggering booster fan RB under the operating mode that the unit booster fan breaks down;
The DCS controller; be coupled to described trigger; be used for the load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself; utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously; set up the passage of a flue gas flow;, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit.
Optionally, in the utility model one embodiment, described unit booster fan breaks down to trip and gets two judgements by booster fan trip signal three.
Optionally, in the utility model one embodiment, described trigger, also be used for after booster fan RB triggers,, if unit actual load and preset booster fan RB target load difference meet less than preset difference or operations staff's hand reset, trigger booster fan RB involution; Described DCS controller, also for restarting booster fan below the startup loading point that the load of unit is dropped to preset booster fan.
Optionally, in the utility model one embodiment, described trigger is by general processor, or DSP digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic is realized; Described DCS controller is by general processor, or DSP digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic is realized.
technique scheme has following beneficial effect:, because adopt trigger, be used for triggering booster fan RB under the operating mode that the unit booster fan breaks down, the DCS controller, be coupled to described trigger, be used for the load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself, utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, set up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantee the technological means of the operation of unit, so reached following technique effect: the testing program of obtaining of the key parameter of the overall plan by design booster fan RB and the success of the test of guaranteeing, filled up the blank of domestic booster fan as the RB test of Important Auxiliary equipment.By designing new booster fan RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, avoid when the booster fan fault desulfurization by-pass damper remove and the flue shutoff after the negative effect that brings to the coal fired power generation unit operation, realize that desulfurizer is synchronizeed with the boiler main frame, long-term, stable operation, greatly reduce the generation of the unplanned stoppage in transit of unit that causes due to the booster fan fault.For guaranteeing that unit safety operation, the unplanned stoppage in transit number of times of minimizing unit have decisive meaning, all play important effect to the unit safety of Power Plant Side and the power supply safety of grid side.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method flow diagram of the booster fan runback RB of a kind of power plant of the utility model embodiment;
Fig. 2 is the apparatus structure schematic diagram of the booster fan runback RB of a kind of power plant of the utility model embodiment;
Fig. 3 is the air and flue system schematic diagram of the utility model application example power plant with booster fan;
Fig. 4 is the utility model application example booster fan RB logical schematic;
Fig. 5 is tripping operation coal pulverizer step and the time logical schematic of the utility model application example booster fan RB;
Fig. 6 starts the Process Design schematic diagram of booster fan again after the utility model application example booster fan RB.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technological scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making under the creative work prerequisite the every other embodiment who obtains, and all belong to the scope of the utility model protection.
The utility model embodiment provides the device of a kind of booster fan runback RB of power plant,, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit.
As shown in Figure 1, be the method flow diagram of the booster fan runback RB of a kind of power plant of the utility model embodiment, described method comprises:
101, under the operating mode that the unit booster fan breaks down, trigger booster fan RB;
102, the load of unit is down to current operational outfit and allows the corresponding preset booster fan RB target load of exerting oneself; utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously; set up the passage of a flue gas flow,, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit.
Optionally, described under the operating mode that the unit booster fan breaks down, trigger booster fan RB, comprising: when the unit booster fan breaks down tripping operation and unit cooperative system while having dropped into stove with the machine state, namely trigger booster fan RB and occur.
Optionally, the tripping operation of breaking down of described unit booster fan is got two judgements by booster fan trip signal three.
Optionally, described load with unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself, utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, set up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit, comprising: the unit cooperative system is switched to the machine following state by stove with the machine state, with speed limit not, booster fan is regulated movable vane simultaneously and open to the standard-sized sheet position; Preset booster fan RB target load is placed to the load loop of coherent system, and boiler master is delivered in the instruction that acts as a fuel of fuel quantity corresponding to preset booster fan RB target load; Will be according to the number of units of the coal pulverizer of unit operation, the step of coal pulverizer trips, jumping the mill principle is: without time delay, jump the superiors' mill, with the reality of interval 5S trip other coal pulverizer and finally keep three coal pulverizers operations of the bottom of order from top to bottom, and will jump and grind instruction and deliver to Boiler Furnace Safeguard Supervisory System FSSS system.
Optionally, described method also comprises: after booster fan RB triggers,, if unit actual load and preset booster fan RB target load difference meet less than preset difference or operations staff's hand reset, trigger booster fan RB involution: restart booster fan below the load of unit being dropped to the startup loading point of preset booster fan.
Corresponding to said method embodiment, as shown in Figure 2, be the apparatus structure schematic diagram of the booster fan runback RB of a kind of power plant of the utility model embodiment, described device comprises:
Trigger 21, be used for triggering booster fan RB under the operating mode that the unit booster fan breaks down;
Optionally, described trigger 21 is used for triggering booster fan RB under the operating mode that the unit booster fan breaks down, and comprising: when the unit booster fan breaks down tripping operation and unit cooperative system while having dropped into stove with the machine state, namely trigger booster fan RB and occur.
Optionally, the tripping operation of breaking down of described unit booster fan is got two judgements by booster fan trip signal three.
Optionally, described DCS controller 22, concrete being used for is down to the load of unit with current operational outfit and allows the corresponding preset booster fan RB target load of exerting oneself, utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, set up the passage of a flue gas flow,, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit, comprise: the unit cooperative system is switched to the machine following state by stove with the machine state, with speed limit not, booster fan is regulated movable vane simultaneously and open to the standard-sized sheet position; Preset booster fan RB target load is placed to the load loop of coherent system, and boiler master is delivered in the instruction that acts as a fuel of fuel quantity corresponding to preset booster fan RB target load; Will be according to the number of units of the coal pulverizer of unit operation, the step of coal pulverizer trips, jumping the mill principle is: without time delay, jump the superiors' mill, with the reality of interval 5S trip other coal pulverizer and finally keep three coal pulverizers operations of the bottom of order from top to bottom, and will jump and grind instruction and deliver to Boiler Furnace Safeguard Supervisory System FSSS system.
Optionally, described trigger 21, also be used for after booster fan RB triggers, and, if unit actual load and preset booster fan RB target load difference meet less than preset difference or operations staff's hand reset, triggers booster fan RB involution; Described DCS controller, also for restarting booster fan below the startup loading point that the load of unit is dropped to preset booster fan.
Optionally, described trigger 21 is by general processor, or DSP digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic is realized; Described DCS controller 22 is by general processor, or DSP digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic is realized.
the utility model embodiment technique scheme has following beneficial effect:, because adopt trigger, be used for triggering booster fan RB under the operating mode that the unit booster fan breaks down, the DCS controller, be coupled to described trigger, be used for the load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself, utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, set up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantee the technological means of the operation of unit, so reached following technique effect: the testing program of obtaining of the key parameter of the overall plan by design booster fan RB and the success of the test of guaranteeing, filled up the blank of domestic booster fan as the RB test of Important Auxiliary equipment.By designing new booster fan RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, avoid when the booster fan fault desulfurization by-pass damper remove and the flue shutoff after the negative effect that brings to the coal fired power generation unit operation, realize that desulfurizer is synchronizeed with the boiler main frame, long-term, stable operation, greatly reduce the generation of the unplanned stoppage in transit of unit that causes due to the booster fan fault.For guaranteeing that unit safety operation, the unplanned stoppage in transit number of times of minimizing unit have decisive meaning, all play important effect to the unit safety of Power Plant Side and the power supply safety of grid side.
Below in conjunction with application example, the utility model embodiment such scheme is described in detail:
As shown in Figure 3, be the air and flue system schematic diagram of the utility model application example power plant with booster fan.Because the transformation of the desulfurization bypass flue shutoff of carrying out from 2010 there is no full ripe design and case study on implementation thermal control Optimization Experience is used for reference, also without corresponding technical standard, relevant work flow process and standard support, the shortage long-term risk is estimated; After the desulfurization transformation, need to adapt to the new method of operation, desulphurization system significance increases suddenly.After above-mentioned transformation is completed, the air and flue system of unit, combustion system characteristic have greatly changed, and need to optimize RB (RUNBACK, the runback) function of unit air and flue system comprehensively.And above-mentioned transformation runs through from design, type selecting, transformation enforcement, opens machine operation, test, later stage assessment overall process.The RB test function is as the whole-process automatic automatic control system that does not allow manual intervention, it is the major pant item equipment of bearing generator set as sending, fast reducing unit load during arbitrary fault trip in induced draught fan, primary air fan, coal pulverizer or feed water pump, and unit load and the maximum load that still at the subsidiary engine equipment of operation, can bear is adapted and realize the control of RB process.The setting of RB project is according to the difference of the difference of the difference of machine set type, trip device and operating conditions and fixed, with regard to thermal power plant typical case unit, generally contain following items: feed water pump RB, stove water pump RB, coal pulverizer RB, primary air fan RB, send induced draught fan RB.
After Desulphurization for Coal-fired Power Plant system flue duct bypass is implemented thorough shutoff, for guaranteeing unit safe operation under new desulfurization air and flue system operating conditions, reducing the unplanned stoppage in transit number of times of unit, guarantee the unit safety of Power Plant Side and the power supply safety of grid side, the utility model proposes a kind of runback function (RUNBACK is called for short RB)---booster fan RB of new unit.booster fan RB design is exactly to guarantee under the fast transient operating mode that the unit booster fan breaks down, by the selection of the judgement of the logic under various different operating modes and the method for operation with control strategy, automatically complete the load of unit is down to current operational outfit and is allowed the corresponding target load of exerting oneself, utilize the movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, set up the express passway of a flue gas flow, guarantee that main regulating system is working properly, keep the unit major parameter in allowed band, thereby greatly reduce the non-number of times that stops of unit, guarantee the safe and stable operation of unit.By designing new booster fan RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, avoid when the booster fan fault desulfurization by-pass damper remove and the flue shutoff after the negative effect that brings to the coal fired power generation unit operation, realize that desulfurizer is synchronizeed with the boiler main frame, long-term, stable operation, greatly reduce the generation of the unplanned stoppage in transit of unit that causes due to the booster fan fault.
The utility model application example booster fan RB Summary on design:
At present, the design of the typical RB function of thermal power generation unit mainly comprises: the switching of the triggering of RB signal, unit control mode, jumping time consuming and step, RB target load and load shedding speed, RB involution major part.The design of booster fan RB function equally also comprises the content of above-mentioned six functions.
the maximum difference of the utility model application example booster fan RB and existing other blower fans RB function is: for other blower fans RB, (for example A draws when the tripping operation blower fan, A send, the A primary air fan) after the action, (for example B draws working fan, B send, the B primary air fan) still can normally operation in self maximum output allowed band, but the booster fan of most of units is the separate unit configuration, therefore need to utilize the quick standard-sized sheet of booster fan movable vane to set up unobstructed flue in booster fan moment of tripping, keep unit band portion load operation by strengthening exerting oneself of induced draught fan under this flue gas channel, thereby avoid the unplanned stoppage in transit of unit.Under this kind operating mode, the exhaust gas volumn that the target load of booster fan RB is determined and target load is corresponding is calculated (preventing the induced draught fan surge), is the emphasis of booster fan RB Functional Design.
The target load of the utility model application example booster fan RB determine and the startup load of the calculated value of the exhaust gas volumn that target load is corresponding, booster fan RB involution rear fan can carry out fan characteristic test, unit flue cold conditions when on-load (not), hot (during on-load) resistance test and combustion test on the spot in power plant, consider and draw according to the result of above-mentioned test.Take off resistance test as example take unit flue cold conditions, can be by under booster fan full cut-off after experimental test desulfurization bypass shutoff and booster fan movable vane standard-sized sheet operating mode and the flue resistance situation of lower desulphurization system, the test unit starts again after the flue resistance situation of lower desulphurization system under booster fan full cut-off and booster fan movable vane complete shut-down operating mode after the bearable load under this operating mode and flue gas flow parameter, test desulfurization bypass shutoff, the tripping operation of test booster fan minimum load point (relation of air quantity and movable vane aperture).And the unit load point when the on-load ability (booster fan tripping operation RB target load) of the unit while can be further according to hot resistance test result, determining again the booster fan tripping operation and booster fan startup.Shaanxi Jin Jie 600MW Site for Unit is carried out above-mentioned test, record induced draught fan maximum flue gas flow that bears in the air and flue system that the flue gas channel that booster fan movable vane standard-sized sheet is set up forms, the electric load of conversion unit when hot must not be greater than 300MW.The minimum steady combustion load that obtains unit according to the combustion test of unit is 240MW, consider working control allowance problem, the target load of design booster fan be greater than minimum steady combustion load for 240MW less than air and flue system bearable load 300MW, therefore designing booster fan RB target load is 280MW.And draw the parameter value that booster fan starts again: the movable vane aperture is not more than 10%, again starts unit load and is not more than 160MW.
The overall plan of the utility model application example booster fan RB design:
Draw a unit that increases configuration for 600MW and air and flue system two, can control Functional Design existing according to Power Plant DCS System and build shown in following Fig. 4 of control logic, 5 of booster fan RB: wherein, as shown in Figure 4, be the utility model application example booster fan RB logical schematic; As shown in Figure 5, be tripping operation coal pulverizer step and the time logical schematic of the utility model application example booster fan RB.Designed logic has contained 3 sub-systems in the Power Plant DCS, comprise MCS(Modulating Control System, analog control system) system (coordinating and the RB logic), FSSS(Furnace Safety Supervision System, Boiler Furnace Safeguard Supervisory System, can be described as again burner management system (Burner Management System)) system (tripping operation mill logic), desulfurization DCS system.Determined that by site test booster fan RB target load is 280MW for above-mentioned 600MW unit, the booster fan RB control flow of design is as follows:
1, the triggering of booster fan RB: (by booster fan trip signal three, get two judgements) and the unit cooperative system has dropped into stove when the machine state when actual load is not less than 320MW and booster fan fault trip, namely trigger booster fan RB and occur.
2, the switching of unit control mode: booster fan RB is in case trigger, be about to the unit cooperative system and be switched to the machine following state by stove with the machine state, with maximum rate (namely not speed limit), booster fan is regulated movable vane simultaneously and open to (100% aperture position, standard-sized sheet position by current location.）
3, RB target load and load shedding speed: booster fan RB is in case trigger, booster fan RB target load 280MW and load reduction of speed rate 900MW/Min are placed to the load loop of coherent system, and boiler master is delivered in the instruction that acts as a fuel of fuel quantity corresponding to 280MW load.
4, jump time consuming and step (as shown in Figure 5): booster fan RB is in case trigger, will be according to the number of units of the coal pulverizer of unit operation, the step of coal pulverizer trips, jumping the mill principle is: without time delay, jump the superiors' mill, with the reality of interval 5S trip other coal pulverizer and finally keep three coal pulverizers operations of the bottom of order from top to bottom, and will jump and grind instruction and deliver to the FSSS system.Shown in table 1 specific as follows:
Table 1
5, RB involution: after booster fan RB triggered, unit actual load and booster fan R B target load difference met less than 20MW or operations staff's hand reset (as shown in Figure 4), and booster fan RB involution condition meets.
After other blower fans RB, then increasing and decreasing load is different if can directly start blower fan after the fault blower fan can be worked, and after booster fan RB involution, the Starting mode of follow-up booster fan is also another key content that can not ignore.
The design of follow-up startup scheme after the utility model application example booster fan RB involution:
As shown in Figure 6, for again starting the Process Design schematic diagram of booster fan after the utility model application example booster fan RB.After booster fan RB involution, the follow-up startup scheme of booster fan is with different with other blower fans RB: after other blower fans RB, after the elimination fault can be moved if the fault blower fan ascertains the reason, can start blower fan and then directly complete the work of increasing and decreasing load on original load.But after booster fan RB involution, if the fault of booster fan is got rid of, can put into operation, can not directly directly start booster fan on the basis of existing load, but load will be dropped to below the startup loading point 160MW of booster fan, the startup of booster fan load can be determined by preceding method.
The booster fan RB test of the utility model application example reality is as follows:
According to above-mentioned design proposal and test data, carried out actual booster fan RB test in state Hua Jin circle power plant, stoppage in transit booster fan when unit load 550MW, trigger booster fan RB action, the rear hearth negative pressure recovered stable in 26 seconds, load steadily dropped to 262MW in 5 minutes, whole process of the test is without any human intervention.Test is success once, and is specific as follows:
Carried out the RB test of booster fan one day.Before test, the unit operating mode is as follows:
Unit load: 550MW
Coordinated control mode: stove is coordinated with machine
Operation mill situation: A, B, C, D, E
Total coal-supplying amount: 191.3t/h
Total blast volume: 1991.4t/h
Combustion chamber draft :-0.07KPa
Pressure: 16.42MPa before machine
Steam water-level :-10mm
Main stripping temperature: 543 ℃
The 20:16:24 operations staff stops booster fan on the spot, after booster fan stops, triggers booster fan RB action:
---open booster fan without time delay take maximum rate after → RB occurs and regulate movable vane to the standard-sized sheet position (the actual act time is as 31s)
---→ unit cooperative control mode is coordinated automatically to be switched to machine by stove with machine and is followed mode, unit load is down to 267MW by 550MW with the speed of 600MW/MIN, set sliding pressure variable Rate 0.21MPa/Min, set the sliding pressure desired value and be down to 11.3MPa from 16.42Mpa, locking increases machine comprehensive valve bit instruction
---jump the E mill without time delay after → FSSS system RB occurs,, with the actual tripping operation D coal pulverizer of interval 5S, finally keep three coal pulverizer operations of the bottom, the final fuel command of coal pulverizer is by by flue resistance test and combustion test, being calculated as 95.4t/h.
---→ RB resets target load by by flue resistance test and combustion test, being calculated as 276MW.
---other blower fan of → air and flue system (comprise send, air inducing and primary air fan) all keeps automatic adjustment state, keeps the stable of combustion chamber draft, air output, primary air pressure.Steam water-level, main Stream Temperature Control System all keep automatic adjustment state.
---→ total system tends towards stability after 4 minutes 22 seconds.
In whole process, maximin such as the following table 2 of the change curve of each major parameter of unit in change procedure:
Table 2
The utility model application example scheme: the test that (1) carries out Site for Unit is the basis of the critical data of design supercharging wind RB function.At first carry out cold conditions, hot wind and smoke resistance test according to preceding method, and in conjunction with the feasibility of the data assessment booster fan RB function of fan characteristic test and combustion test, determine after exhaust gas volumn corresponding to the target load of booster fan RB and target load, booster fan RB involution after the startup of the unit calculated value of loading.And characteristic and the shut-in time of mensuration booster fan actuator.(2) booster fan RB Functional Design is according to preceding method; directly can realize by configuration and modification Logical Configuration in the Power Plant DCS logic, the key signal of triggering booster fan RB increases after hard connecting line gets two by desulfurization DCS three and delivers to main frame DCS in the time of can shutting down light maintenance according to power plant as " the booster fan fault is stopped ".(3) completing after (1) and (2) (to be the rated load of unit 60% than low-load at unit, can load at 400MW for the 600MW unit) time, carry out preliminary experiment one time, according to test data and test result, bulk testing scheme, Key experiments data are optimized and improve.(4) can carry out formal booster fan RB test after completing (1) and (2), (3) when high load.(5) after completing booster fan RB test, handle the booster fan fault, after booster fan can put into operation, by preceding method carry out booster fan RB complete after the startup of booster fan.As seen, its advantage has three: 1, the conceptual design implementation is strong, and existing theoretical calculating,, again in conjunction with unit actual tests data, be convenient to mate according to the unit self character.2, this programme does not need extra equipment to realize, based on the DCS control platform of unit, can complete, and operability and control security are strong, are convenient to promote.3, the domestic design proposal that proposes first booster fan RB, and in conjunction with this scheme, verify on state Hua Jin circle 600MW unit, test is success once.Technical merit is reliable, ripe.In the face of Chinese Ministry of Environmental Protection " 12 " reduces discharging requirement, the shutoff work of each Desulphurization for Coal-fired Power Plant bypass is imperative, the overall plan of the utility model application example by design booster fan RB and the testing program of obtaining of the key parameter of the success of the test guaranteed, filled up the blank of domestic booster fan as the RB test of Important Auxiliary equipment.By designing new booster fan RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, avoid when the booster fan fault desulfurization by-pass damper remove and the flue shutoff after the negative effect that brings to the coal fired power generation unit operation, realize that desulfurizer is synchronizeed with the boiler main frame, long-term, stable operation, greatly reduce the generation of the unplanned stoppage in transit of unit that causes due to the booster fan fault.For guaranteeing that unit safety operation, the unplanned stoppage in transit number of times of minimizing unit have decisive meaning, all play important effect to the unit safety of Power Plant Side and the power supply safety of grid side.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the utility model embodiment lists, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of specific application and whole system by hardware or software.Those skilled in the art can be for every kind of specific application, and can make ins all sorts of ways realizes described function, but this realization should not be understood to exceed the scope of the utility model embodiment protection.
Various illustrative logical block described in the utility model embodiment, or unit can pass through general processor, DSP digital signal processor, specific integrated circuit (ASIC), field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize by the combination of computing device, for example DSP digital signal processor and microprocessor, multi-microprocessor, Digital Signal Processor Core of one or more microprocessors associating, or any other similarly configuration realize.
Method described in the utility model embodiment or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storage, flash memory, ROM storage, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or related domain.Exemplarily, storage medium can be connected with processor so that processor can be from storage medium reading information, and can deposit write information to storage medium.Alternatively, storage 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, processor and storage medium also can be arranged in different parts in user terminal.
In one or more exemplary designs, the described above-mentioned functions of the utility model embodiment can realize in hardware, software, firmware or this three's combination in any.If realize in software, these functions can be stored on medium with computer-readable, or with one or more instructions or code form, are transmitted on the medium of computer-readable.The computer-readable medium comprises the computer storage medium and is convenient to make allows computer program transfer to other local telecommunication media from a place.Storage medium can be the useable medium that any general or special computer can access.For example, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly can be used for carrying or storage and can be read by general or special computer or general or special processor the medium of the program-code of form with instruction or data structure and other.In addition, any connection can suitably be defined as the computer-readable medium, for example, if software is by a concentric cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in defined computer-readable medium with wireless way for transmittings such as infrared, wireless and microwave from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable medium.
Above-described embodiment; the purpose of this utility model, technological scheme and beneficial effect are further described; institute is understood that; the foregoing is only embodiment of the present utility model; and be not used in and limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. the device of the booster fan runback RB of power plant, is characterized in that, described device comprises:
Trigger, be used for triggering booster fan RB under the operating mode that the unit booster fan breaks down;
The DCS controller; be coupled to described trigger; be used for the load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself; utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously; set up the passage of a flue gas flow;, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit.
2. the device of power plant's booster fan runback RB as claimed in claim 1, is characterized in that, the tripping operation of breaking down of described unit booster fan is got two judgements by booster fan trip signal three.
3. the device of power plant's booster fan runback RB as claimed in claim 1, is characterized in that,
Described trigger, also be used for after booster fan RB triggers, and, if unit actual load and preset booster fan RB target load difference meet less than preset difference or operations staff's hand reset, triggers booster fan RB involution;
Described DCS controller, also for restarting booster fan below the startup loading point that the load of unit is dropped to preset booster fan.
4. the device of power plant's booster fan runback RB as claimed in claim 1, is characterized in that,
Described trigger is by general processor, or DSP digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic is realized;
Described DCS controller is by general processor, or DSP digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202794552U CN203285709U (en) | 2013-05-21 | 2013-05-21 | Auxiliary breakdown load reducing RB device of booster fan in power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202794552U CN203285709U (en) | 2013-05-21 | 2013-05-21 | Auxiliary breakdown load reducing RB device of booster fan in power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203285709U true CN203285709U (en) | 2013-11-13 |
Family
ID=49542075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202794552U Expired - Lifetime CN203285709U (en) | 2013-05-21 | 2013-05-21 | Auxiliary breakdown load reducing RB device of booster fan in power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203285709U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076801A (en) * | 2014-07-10 | 2014-10-01 | 大唐阳城发电有限责任公司 | Automatic ultrahigh tension long-distance transmission line malfunction load shedding system and method |
| WO2014187224A1 (en) * | 2013-05-21 | 2014-11-27 | 国家电网公司 | Power plant booster fan runback (rb) method and device |
| CN110553242A (en) * | 2019-08-08 | 2019-12-10 | 华北电力科学研究院有限责任公司 | Direct current furnace unit RB control method and device based on differentiation parameters |
| CN113898969A (en) * | 2021-09-29 | 2022-01-07 | 华电莱州发电有限公司 | Control system and method for improving RB working condition of thermal power generating unit blower |
-
2013
- 2013-05-21 CN CN2013202794552U patent/CN203285709U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187224A1 (en) * | 2013-05-21 | 2014-11-27 | 国家电网公司 | Power plant booster fan runback (rb) method and device |
| CN104179704A (en) * | 2013-05-21 | 2014-12-03 | 国家电网公司 | Method and device for power plant booster fan runback (RB) |
| CN104179704B (en) * | 2013-05-21 | 2016-05-04 | 国家电网公司 | Method and the device of a kind of booster fan runback RB of power plant |
| CN104076801A (en) * | 2014-07-10 | 2014-10-01 | 大唐阳城发电有限责任公司 | Automatic ultrahigh tension long-distance transmission line malfunction load shedding system and method |
| CN104076801B (en) * | 2014-07-10 | 2017-02-15 | 大唐阳城发电有限责任公司 | Automatic ultrahigh tension long-distance transmission line malfunction load shedding system and method |
| CN110553242A (en) * | 2019-08-08 | 2019-12-10 | 华北电力科学研究院有限责任公司 | Direct current furnace unit RB control method and device based on differentiation parameters |
| CN113898969A (en) * | 2021-09-29 | 2022-01-07 | 华电莱州发电有限公司 | Control system and method for improving RB working condition of thermal power generating unit blower |
| CN113898969B (en) * | 2021-09-29 | 2023-09-19 | 华电莱州发电有限公司 | Control system and method for improving RB working condition of blower of thermal power generating unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104179704B (en) | Method and the device of a kind of booster fan runback RB of power plant | |
| CN103133147B (en) | Method and apparatus for changing the power output in combustion gas turbine systems | |
| Lu et al. | Short-term scheduling of combined cycle units | |
| CN203285709U (en) | Auxiliary breakdown load reducing RB device of booster fan in power plant | |
| US20110037276A1 (en) | Method for controlling a gas turbine in a power station, and a power station for carrying out the method | |
| CN103016379B (en) | Control method for unbypassed booster fan of desulphurization system | |
| CN104235819A (en) | Control method for parallel operation of steam-driven induced draft fan and electric induced draft fan of thermal power generating unit | |
| CN202735797U (en) | Distributed control system for coal mine ventilation air oxidation generator set | |
| CN203718738U (en) | Primary fan RB control system for supercritical unit | |
| CN103574578A (en) | Anti-implosion control method for boiler furnace and smoke system in 1045 MW thermal power generating unit by adopting three-in-one induced draft fan | |
| Michailos et al. | A modelling study of post-combustion capture plant process conditions to facilitate 95–99% CO2 capture levels from gas turbine flue gases | |
| CN104020737A (en) | Slurry circulating pump RB control method of thermal power generating unit | |
| Brasington | Integration and operation of post-combustion capture system on coal-fired power generation: load following and peak power | |
| Carraretto | Power plant operation and management in a deregulated market | |
| CN108265152B (en) | Converter steelmaking gas full recovery process based on nitrogen compensation and control method thereof | |
| CN104295475B (en) | The method and system of a kind of desulfurization slurry recycle pump RB | |
| CN104296156B (en) | A kind of method and system of desulfurization fume heat exchanger RB | |
| CN203375464U (en) | Linkage type air induction device in thermal power plant desulfurization smoke system | |
| US20130261818A1 (en) | Integrated electric power generation and steam demand control system for a post combustion co2 capture plants | |
| CN203615353U (en) | Desulphurization system of coal power generating unit | |
| CN106287673A (en) | There is w-type combustion boiler and the control method thereof of thermoelectricity motility regulatory function | |
| CN203656953U (en) | Desulfurization GGH (gas gas heater) RB (runback) system | |
| CN103335325B (en) | Coordinated type blower unit in heat-engine plant desulfurized flue gas system and method for operating thereof | |
| CN113970890A (en) | Thermal power generating unit automatic start-stop system based on digital simulation and development method thereof | |
| CN110296386B (en) | Fuel control method under FCB working condition of coal-fired unit for mixed combustion of coal gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |