CN104696941B - The startup restoration methods of generating set during a kind of booster fan on-mechanical exception - Google Patents
The startup restoration methods of generating set during a kind of booster fan on-mechanical exception Download PDFInfo
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Abstract
The present invention relates to the startup restoration methods of generating set during a kind of booster fan on-mechanical exception, including step one: reduce flue gas desulphurization system resistance, possess ventilation condition in system, booster fan possesses the ventilation group of starting trouble when coasting operation；Step 2: regulate boiler draft group and make the total blast volume of boiler increase, after purging, light a fire subsequently；Step 3: increase the load of unit after igniting, makes the outlet blast of air-introduced machine and boiler total blast volume keep relatively fluctuation within a narrow range to rise；Step 4: after booster fan possesses entry condition, controls the load of generating set and the total blast volume of boiler, starts booster fan；Step 5: regulator generator group recovers the parameter of normal tape splicing load, it is achieved unit properly functioning。It achieve the booster fan non-mechanism fault trip in thermal power generation unit and cause that the unit in dum boiler MFT situation quickly starts, it is to avoid after dum boiler MFT, booster fan need to overhaul and cause that generating set is forced to beat lock " unplanned outage " event。
Description
Technical field
The present invention relates to the startup restoration methods of a kind of thermal power generation unit, the startup restoration methods of generating set during especially a kind of booster fan on-mechanical exception。
Background technology
Along with the pollution of current environment is day by day serious, adding the environmental protection policy increasingly stringent of country, all design and installations of newly-built pulverized-coal fired boiler have desulfurizer, and the former generating set not installing desulfurizer has been carried out the transformation of flue gas system and has been additionally arranged desulfurizer。The resistance devices such as former flue, flue gas heat-exchange unit (GGH), absorption tower, clean flue, baffle door are flowed through due to flue gas, so booster fan need to be arranged to overcome the resistance of whole desulphurization system equipment, it is to ensure that the visual plant of desulphurization system runnability and reliability。
Booster fan ensures the properly functioning of generating set as the requisite equipment of desulphurization system, therefore the stable operation of booster fan has become the key factor affecting a generating set stable operation, but in some cases, booster fan occurs when on-mechanical fault can not be run in short-term, seriously constrain the startup of generating set, after causing boiler main fuel trip (MFT) especially for the tripping operation of subcritical dum boiler booster fan, cannot starting booster fan in short-term in, to recover boiler operatiopn low and be forced dozen lock steam turbine generator with Stream temperature degree。As the short time cannot recover, not only cause the loss of electricity, and owing to the natural heat dissipation of boiler cools down, the fuel consumption in boiler restarting procedure and coal consumption, manual operation maintenance workload can be caused to increase, bring serious economic loss to enterprise。When prior art overcomes booster fan on-mechanical fault but without effective method, quickly start and recover generating set, save start-up cost, reduce the technical scheme of economic loss。
Given this present invention is proposed。
Summary of the invention
The purpose of the present invention is for overcoming the deficiencies in the prior art, one is provided to a certain degree to reduce " unplanned outage " number of times, shorten the startup time of generating set, save the loss of fuel and manpower, the method of operation making generating set is more flexible, economic loss is at utmost reduced, the startup restoration methods of generating set during the booster fan on-mechanical exception that economic benefit is obvious and application prospect is very wide when booster fan on-mechanical accident。
In order to realize this purpose, the present invention adopts the following technical scheme that the startup restoration methods of generating set during a kind of booster fan on-mechanical exception, comprises the steps:
Step one: reduce the resistance of flue gas desulphurization system, possesses ventilation condition at desulfurizing technology system, booster fan is when possessing coasting operation, the ventilation group of starting trouble；Described coasting operation specifically refers to rotate the automatic rotation after machinery runs out of steam when meeting the basic rotational support such as bearing lubrication cooling, and mechanical part does not generally result in damage；Otherwise namely need to take brake measure to stop operating immediately in case stopping loss mistake and expanding。Specifically it is referred to steam turbine introduction of idling curve after main inlet throttle-stop valve is closed and run out of steam, is a key parameter。Booster fan possesses the implication of coasting operation condition and is namely required to meet the basic rotational support condition such as lubrication, visual examination, tentatively gets rid of mechanical breakdown。
Described ventilation group includes: pressure fan, air-introduced machine and grind raw coal and meet the primary air fan that pulverized coal preparation system burns to boiler pulverized coal conveying。Start booster fan, air-introduced machine and pressure fan successively during normal startup ventilation group, when adopting the technical program, owing to booster fan cannot normally start, when therefore ensureing that booster fan possesses coasting operation when starting, start air-introduced machine and pressure fan successively。Described primary air fan starts when needing to put into coal dust according to practical situation after boiler relies on the igniting such as fuel oil or combustion gas in advance and provides primary air flow for system。Wherein pressure fan provides secondary air flow for generating set, in order to overcome the resistance of air preheater, air channel and burner, inputs combustion air, maintains the burning of fuel。
Step 2: after ventilation group starts, controls boiler draft group and makes the total blast volume of boiler increase and promote the rotor of booster fan to rotate, when total blast volume reaches purging condition, to ignition of the boiler after boiler is purged；The purpose purged is to be discharged by the material easily caused by blast, and these materials are mainly the mixture such as oil, fuel gas, coal dust。Boiler lifting according to circumstances can also start primary air fan after terminating igniting when not putting into coal dust, meets the needs of fuel oil or combustion gas。
Step 3: increase the load of generating set after igniting, the outlet pressure regulating air-introduced machine makes its relatively fluctuation within a narrow range, it is therefore an objective to regulating air-introduced machine outlet pressure to overcome the resistance of desulphurization system, under nominal situation, this resistance is overcome by booster fan；And make air quantity increase in relatively fluctuation within a narrow range；The scope of its fluctuation is between the 25%～40% of specified total blast volume; 25% to bend down air quantity MFT meeting protection act; more than 40% air quantity then can cause booster fan inlet pressure level under on-mechanical failure condition higher; and then jeopardize air-introduced machine safe operation; air quantity fluctuation great Yi occurs burning deterioration to cause MFT again, and the fluctuation range that should control air quantity controls 35% ± 5%。
Step 4: after booster fan possesses entry condition, the load of stable electric generation unit, control total blast volume and the booster fan movable vane aperture of boiler, start booster fan；
Step 5: after booster fan starts, regulator generator group recovers the condition of normal tape splicing load, it is achieved generating set properly functioning。It is gradually increased air quantity and coal dust amount to produce pressure, temperature and the flow steam at certain claimed range, along with the increase of steam flow promotes Turbo-generator Set load to increase, is finally reached the normal operating conditions of generating set。
Total blast volume described in aforesaid step is the superposition of primary air flow and secondary air flow, the primary air flow that namely primary air fan produces, the summation of the secondary air flow that pressure fan produces。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, it is unimpeded and have the condition passing into flue gas that desulfurizing technology system described in step one possesses air channel that ventilation condition is desulfurizing technology system, booster fan possesses the lubricating system normal operation that condition is booster fan of coasting operation, booster fan mechanical fault。Described coasting operation specifically refers to rotate the automatic rotation after machinery runs out of steam when meeting the basic rotational support such as bearing lubrication cooling, and mechanical part does not generally result in damage；Otherwise namely need to take brake measure to stop operating immediately in case stopping loss mistake and expanding。Specifically it is referred to steam turbine introduction of idling curve after main inlet throttle-stop valve is closed and run out of steam, is a key parameter。Booster fan possesses the implication of coasting operation condition and is namely required to meet the basic rotational support condition such as lubrication, visual examination, tentatively gets rid of mechanical breakdown。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, described step one includes following content:
A) the fraction slurries circulating pump of stoppage in transit desulfurizing technology system is to reduce the resistance of flue gas desulphurization system；Quantity especially by the slurry circulating pump reduced in the prewashing tower of desulphurization system and absorption tower reaches to reduce the purpose of the resistance of flue gas desulphurization system, provides a good entry condition for starting of generating set。
B) booster fan movable vane aperture is left to 100%；This movable vane properly functioning is in adjustment state to control power of fan size, and 0% aperture then thinks closed mode。It is make maximum possible reduce systematic working medium at the resistance by this through-flow section of booster fan movable vane that movable vane aperture is opened to maximum purpose, and its purpose is also provide a good entry condition for starting of generating set。
C) ventilation unit is started。When ensureing that booster fan possesses coasting operation, and after the fraction slurries circulating pump of stoppage in transit desulfurizing technology system and booster fan movable vane aperture are opened to 100%, start air-introduced machine successively and the pressure fan of secondary air flow is provided for generating set, making generating set tentatively recover to start。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, in described step 3, when controlling the outlet pressure of air-introduced machine, ventilation should be slowly increased, total blast volume is made to increase in relatively fluctuation within a narrow range, and make booster fan movable vane rotate under air quantity promotes, make combustion chamber draft in below 300Pa fuctuation within a narrow range simultaneously；After ignition of the boiler, slowly put into fuel, reduce the fuel combustion impact on blast。Slow degree depends on the requirement of blower press limits value in air-introduced machine equipment code, not occur axial flow blower stall flutter for principle；Reference range is for controlling combustion chamber draft within+300pa slowly, and in air-introduced machine equipment code, blower press limits value does not transfinite value；Operating process supervision device parameter progressively by linearly carrying out increase air quantity operation, is avoided repeatedly to target direction one-time-reach-place in regulating scope；Significantly or repeatedly air quantity fluctuation can cause the sudden change of system flue gas pressures value, and system flow field instability can incur loss through delay next step operating time。
After ignition of the boiler, it is fuel first by fuel oil or combustion gas, opens primary air fan and put into coal dust when the load of generating set is gradually increased and possesses input coal dust when。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, in described step 3, after ignition of the boiler, before enabling primary air fan, reduce secondary air flow, after primary air fan starts, maintain air quantity and fluctuate in the scope of the 25%～40% of specified total blast volume。The scope of fluctuation is maintained between the 25%～40% of specified total blast volume, and 25% to bend down air quantity MFT protection act, it is possible to can cause detonation；More than 40% air quantity then can cause booster fan inlet pressure level under on-mechanical failure condition higher, and then jeopardizes air-introduced machine safe operation, and air quantity fluctuation great Yi occurs burning deterioration to cause MFT again, it is preferable that the fluctuation range controlling air quantity controls 35% ± 5%。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, the entry condition of the booster fan described in step 4 should meet: when booster fan failture evacuation, booster fan does not reverse, booster fan movable vane aperture is 5%～75%, it is preferable that booster fan movable vane aperture is 5%～50%；And compulsory withdrawal movable vane aperture requires the startup permissive condition less than 5%。Movable vane aperture starts blower fan less than 5% under normal circumstances is industry standard, it is adaptable to different capacity generating set；Purpose is to control agnogenic band load to start, and reduces the impact to cigarette air channel, it is prevented that damage；The booster fan entry condition of the generating set of different capacity is similar, essentially identical。
The above-mentioned booster fan movable vane aperture permissive condition that starts less than 5% answers the reason of compulsory withdrawal to be in that: one side booster fan reality has been forced band idling and has moved, under reason known case, cigarette air channel and equipment will not be caused damage, on the other hand very important person for removing the restriction of this entry condition to start booster fan recovery power drive as early as possible more than 5% startup by movable vane aperture, and this operation of ordinary circumstance is carried out compulsory withdrawal by Thermal Automation controllers and operates。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, in described step 4, control the total blast volume of boiler and booster fan movable vane aperture according to SR and maintain the pressure of air-introduced machine outlet, starting booster fan。The technology emphasis of regulable control for turning down process can gradually rise due to throttling action SR rising air-introduced machine outlet pressure along with booster fan movable vane regulated by 100% aperture, corresponding boiler total air volume control in 25～40% situations this throttling action booster fan movable vane turn down to less than 40% more apparent while relevant with boiler total blast volume size。The purpose turning down throttling booster fan movable vane is to prepare to reach the balancing effect of driving force and load for starting booster fan, starts booster fan motor and can cause electromotor overload and cause the dynamic impact in serious cigarette air channel in movable vane aperture 100% situation。Preferably turn down booster fan movable vane to control the aperture movable vane experience aperture that is suitably larger than under corresponding air quantity load and can start booster fan immediately, it may be achieved start without impacting undisturbed。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, after booster fan starts, regulate the experience aperture under the movable vane aperture extremely corresponding air quantity load of booster fan immediately。So-called experience aperture can be known according to the corresponding relation of normal course of operation booster fan movable vane aperture, unit load and boiler draft amount parameter, the unit with DCS control system all has historical data memory function for inquiry, it is also possible to according to the operation note of technical staff。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, after booster fan starts, the combustion chamber draft of setting boiler and air-introduced machine outlet pressure are to normal value, and wherein the normal range of the combustion chamber draft of boiler is 0Pa～-300Pa；Air-introduced machine outlet pressure controls in the scope of ± 500pa；Guarantee that (whether working properly can be seen that from electric current, electric current fluctuation is the more apparent sign that blower fan surge is abnormal on the other hand less than the rated value of electric current for the electric current of air-introduced machine；Movable vane aperture is automatically adjusted to normal range, movable vane aperture and electric current corresponding relation is made to match, determine a value range with universality: 0～100% is interior and normal with electric current corresponding relation, i.e. aperture and electric current Non Apparent Abnormality, referring generally to empirical value), and then realize the generating set normal tape splicing load of recovery。Air-introduced machine outlet pressure follows the cooperation of air-introduced machine outlet and booster fan inlet pressure level, it is desirable to be intended in design con-trol scope。
During aforesaid this booster fan on-mechanical exception in the startup restoration methods of generating set, before ventilation group starts, especially by the operation number of the slurry circulating pump on prewashing tower and absorption tower in minimizing desulfurizing technology system to reduce the flue gas resistance of desulfurizing technology system。
After adopting technical solutions according to the invention, bring following beneficial effect: under the operation of method of the present invention:
1, achieve the tripping operation of thermal power generation unit desulphurization devices non-mechanical nature and cause that the unit in boiler main fuel trip situation quickly starts recovery, avoid boiler to be forced make lock and possess follow-up recovery tape splicing load-bearing capacity because of MFT (booster fan tripping operation needs maintenance) Turbo-generator Set afterwards, make generating set be in running status in a sense；
2, at booster fan because starting booster fan after can realizing leading igniting, on-load when certain reason does not possess entry condition, adding the multiformity that generating set starts, the site problems for solving generating set provides new thinking；This operational approach is similarly applied to adopt the start-up course during supercritical thermal power unit booster fan non-mechanical nature fault with type desulfurizer。
3, booster fan section components plan repair is without generating set defect elimination of stopping transport, and booster fan defect elimination of can stopping transport maintains boiler operatiopn and maintains operation according to SR band portions load。This operational approach is similarly applied to adopt with booster fan stoppage in transit maintenance process in the supercritical thermal power unit operation of type desulfurizer。
4, adopting the technical scheme of the application can reduce the start-up cost of generating set when on-mechanical fault occurs in booster fan, have better application prospect, this method need not set up other equipment, less costly。For 600MW unit, booster fan fault unit is non-to stop, maintenance of fan 10 hours, unit load average load rate 75% calculates, 10 hours loss electricity 4,500,000 degree, and unit hot starting, hot start needs two hours to 300MW, loss electricity is about 750,000 degree, amounts to loss electricity 5,250,000 degree；Adopt the technical scheme of the application, according to calculating by on-load 200MW after " starting without booster fan " accident, 10 hours loss electricity 2,500,000 degree, start and recover loss 350,000 degree, amount to loss electricity 2,850,000 degree, its effect just can be seen that from data。
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail。
Accompanying drawing explanation
Fig. 1: the schematic flow sheet of starting method of the present invention。
Detailed description of the invention
Specific embodiments of the invention one: the startup restoration methods of generating set during a kind of booster fan on-mechanical exception, it is characterised in that: comprise the steps:
Step one: reduce the resistance of flue gas desulphurization system, possesses ventilation condition at desulfurizing technology system, booster fan is when possessing coasting operation, the ventilation group of starting trouble；
Step 2: after ventilation group starts, controls boiler draft group and makes the total blast volume of boiler increase and promote the rotor of booster fan to rotate, when total blast volume reaches purging condition, boiler is purged, to ignition of the boiler after purging；
Step 3: increase the load of generating set after igniting, the outlet pressure constantly controlling air-introduced machine makes its relatively fluctuation within a narrow range, and makes total blast volume increase in relatively fluctuation within a narrow range；
Step 4: after booster fan possesses entry condition, controls the load of generating set and the total blast volume of boiler, starts booster fan；
Step 5: after booster fan starts, regulator generator group progressively recovers the condition of normal tape splicing load, it is achieved generating set properly functioning。
In step one, to possess air channel that ventilation condition is desulfurizing technology system unimpeded and have the condition passing into flue gas for desulfurizing technology system, and booster fan possesses the lubricating system normal operation that condition is booster fan of coasting operation, booster fan mechanical fault。
Described step one includes following content:
A) the fraction slurries circulating pump of stoppage in transit desulfurizing technology system is to reduce the resistance of flue gas desulphurization system；This SR is overcome by booster fan under normal circumstances；
B) booster fan movable vane aperture is left to 100%；
C) starting trouble ventilation unit。
In described step 3, when controlling the outlet blast of air-introduced machine, ventilation should be slowly increased, make total blast volume increase in relatively fluctuation within a narrow range, and make booster fan movable vane rotate under air quantity promotes, make combustion chamber draft at below 300Pa simultaneously；After ignition of the boiler, slowly put into fuel, reduce the fuel combustion impact on blast。
In described step 3, after ignition of the boiler, before enabling primary air fan, reduce secondary air flow, after primary air fan starts, maintain air quantity and fluctuate in the scope of the 25%～40% of total blast volume。
The entry condition of the booster fan described in step 4 should meet: when booster fan failture evacuation, booster fan does not reverse, and booster fan movable vane aperture is 5%～75%, it is preferable that booster fan movable vane aperture is 5%～50%；And compulsory withdrawal movable vane aperture requires the startup permissive condition less than 5%。
In described step 4, regulate the movable vane aperture of booster fan according to SR and maintain the pressure of air-introduced machine outlet, starting booster fan。
After booster fan starts, regulate the experience aperture under the movable vane aperture extremely corresponding air quantity load of booster fan immediately。
After booster fan starts, the combustion chamber draft of setting boiler and air-introduced machine outlet pressure are to normal value, and wherein the normal range of the combustion chamber draft of boiler is 0Pa～-300Pa；Air-introduced machine outlet pressure controls in the scope of ± 500pa；Guarantee the electric current rated value less than electric current of air-introduced machine；Movable vane aperture is automatically adjusted to normal range, makes movable vane aperture and electric current corresponding relation match；Realize generating set and recover normal tape splicing load。
Before ventilation group starts, especially by the operation number of the slurry circulating pump on prewashing tower and absorption tower in minimizing desulfurizing technology system to reduce the flue gas resistance of desulfurizing technology system。
Specific embodiments of the invention two: the startup restoration methods of generating set during the booster fan on-mechanical exception of a kind of 600MW unit, comprise the steps:
Step one: reduce the resistance of flue gas desulphurization system, possesses ventilation condition at desulfurizing technology system, booster fan is when possessing coasting operation, the ventilation group of starting trouble；Described ventilation group includes pressure fan, air-introduced machine, grind raw coal meets the primary air fan that pulverized coal preparation system burns to boiler pulverized coal conveying。When entry condition possesses, first start air-introduced machine and pressure fan, control the negative pressure of burner hearth at about 100Pa；Then open the movable vane of pressure fan, it is determined that air-introduced machine regulates normal, and fluctuation does not occur air-introduced machine outlet pressure；The total blast volume making boiler rises。Wherein pressure fan provides secondary air flow for generating set。
Step 2: after ventilation group starts, controls boiler draft group and makes the total blast volume of boiler increase and promote the rotor of booster fan to rotate, when total blast volume reaches purging condition, boiler is purged, to ignition of the boiler after purging；After air quantity reaches the 25%～30% of total blast volume, when air-introduced machine outlet pressure fluctuates within the scope of 800～900Pa, start boiler is purged, light a fire immediately。
Preferential after ignition of the boiler starting upper strata oil gun, make Stream temperature degree and main vapour pressure go up as early as possible, avoid low temperature and beat lock value, the whole process lighted a fire to load 150MW is looked over one's shoulder the outlet pressure of air-introduced machine, it is prevented that disturbance cause greatly outlet blast fluctuation。
Step 3: increase the load of generating set after igniting, the outlet pressure constantly controlling air-introduced machine makes its relatively fluctuation within a narrow range, and makes total blast volume increase in relatively fluctuation within a narrow range；After igniting a period of time, start primary air fan and be simultaneously fed into coal dust as fuel, while starting primary air fan, suitably reducing secondary air flow, and ensure that total blast volume fluctuation is less。Fuel oil is first passed through for being generating set heat supply as fuel when igniting, first ignition of the boiler starts upper strata oil gun, make Stream temperature degree and main vapour pressure go up as early as possible, beat lock value avoiding low temperature, send into coal dust when the reception load of generating set and start primary air fan。
Following table is the relevant parameter successfully starting up the igniting of ventilation group after 600MW generating set MFT (main fuel trip) to 150MW:
Find through long-term practice, in whole operating process, control air-introduced machine outlet pressure in OK range, be determine to start scheme whether successfully key factor without booster fan, and it is little to control air-introduced machine outlet pressure pulsations, it should below several processes note:
Starting after ventilation group, adding in the process of air quantity that operation must be slow。
After ignition of the boiler, the process putting into burning is wanted slowly。
Before starting primary air fan, reducing secondary air flow, after primary air fan starts, the fluctuation maintaining total blast volume is not quite critically important。
Step 4: after booster fan possesses entry condition, controls the load of generating set and the total blast volume of boiler, starts booster fan；Before booster fan starts, following preparation should be done:
1) ruuning situation of booster fan is checked, it is ensured that the movable vane of booster fan does not reverse；
2) force booster fan to start to allow: compulsory withdrawal movable vane aperture requires the startup permissive condition less than 5%；
3) after booster fan possesses entry condition, reduce the total blast volume of boiler, turn down the movable vane of booster fan, start booster fan, adjust rapidly movable vane, keep booster fan inlet pressure in normal range。
4) after booster fan is ready to complete, stable electric generation unit load, slowly turn down booster fan movable vane according to the experience respective value of boiler total blast volume Yu booster fan movable vane aperture, maintain the maximum 1800Pa of air-introduced machine outlet pressure, start booster fan。
Mainly reduce the total blast volume of boiler, turn down the movable vane aperture of booster fan and to 30% and maintain the pressure of air-introduced machine outlet within 2000Pa, depend on this type air-introduced machine outlet pressure design load, corresponding total head value also considers flue pressure-bearing scope, not occur premised on the stall of axial flow blower, surge, the short time controls pressure herein does not transfinite in below 2000pa emphasis supervision air-introduced machine total head value。
Step 5: after booster fan starts, regulator generator group progressively recovers the condition of normal tape splicing load, it is achieved generating set properly functioning。After booster fan starts, turn down the movable vane of booster fan immediately to the aperture under corresponding load, preventing air-introduced machine outlet pressure and being widely varied of combustion chamber draft from causing unsafe accident, booster fan starts after normally, regulates the normal value of combustion chamber draft, air-introduced machine pressure extremely corresponding load。
In step one, to possess air channel that ventilation condition is desulfurizing technology system unimpeded and have the condition passing into flue gas for desulfurizing technology system, and booster fan possesses the lubricating system normal operation that condition is booster fan of coasting operation, makes booster fan mechanical fault。
Described step one includes following content:
A) the fraction slurries circulating pump of stoppage in transit desulfurizing technology system is to reduce the resistance of flue gas desulphurization system；
B) booster fan movable vane aperture is left to 100%；
C) starting trouble ventilation group。
In described step 3, when controlling the outlet pressure of air-introduced machine, ventilation should be slowly increased, make total blast volume increase in relatively fluctuation within a narrow range, and make booster fan movable vane rotate under air quantity promotes, make combustion chamber draft in below 300Pa fuctuation within a narrow range simultaneously；After ignition of the boiler, slowly put into fuel, reduce the fuel combustion impact on blast。
In described step 3, after ignition of the boiler, before enabling primary air fan, reduce secondary air flow, after primary air fan starts, maintain air quantity and fluctuate in the scope of the 25%～40% of total blast volume。
The entry condition of the booster fan described in step 4 should meet: when booster fan failture evacuation, booster fan does not reverse, and booster fan movable vane aperture is 5%～75%, it is preferable that booster fan movable vane aperture is 5%～50%；And compulsory withdrawal movable vane aperture requires the startup permissive condition less than 5%。
In described step 4, regulate the aperture of wind motor leaf according to SR and maintain the pressure of air-introduced machine outlet, starting booster fan。
After booster fan starts, regulate the experience aperture under the movable vane aperture extremely corresponding air quantity load of booster fan immediately。
After booster fan normally starts, the combustion chamber draft of setting boiler and air-introduced machine outlet pressure are to normal value, and wherein the normal range of the combustion chamber draft of boiler is 0Pa～-300Pa；Air-introduced machine outlet pressure controls in the scope of ± 500pa；Guarantee the electric current rated value less than electric current of air-introduced machine；Movable vane aperture is automatically adjusted to normal range, makes movable vane aperture and electric current corresponding relation match；Realize generating set and progressively recover normal tape splicing load。
The experience aperture about 26% under the extremely corresponding air quantity load of movable vane of booster fan is turned down immediately after startup, prevent air-introduced machine outlet pressure and being widely varied of combustion chamber draft from causing dangerous accident, booster fan start normal after, set combustion chamber draft, air-introduced machine outlet pressure to combustion chamber draft 0～-300pa；Air-introduced machine outlet pressure ± below 500pa, it then follows tiny structure burner hearth furnace pressure normal regulating scope；Air-introduced machine outlet pressure follows the cooperation of air-introduced machine outlet and booster fan inlet pressure level, checks that the electric current of air-introduced machine, movable vane aperture turned down automatically to normal range, and unit progressively recovers normal tape splicing load。
Following table is load relevant parameter to 300MW before and after 160MW startup booster fan:
Before ventilation group starts, especially by the operation number of the slurry circulating pump on prewashing tower and absorption tower in minimizing desulfurizing technology system to reduce the flue gas resistance of desulfurizing technology system。Above-mentioned technical scheme is also applied on subcritical drum boiler and the direct current unit of other power plant, the non-of unit can be reduced to a certain extent and stop number of times, shorten the startup time of unit, save the expenses such as the fire coal in unit starting, fuel oil and human resources's loss。This scheme is by improving operational approach, raising labour efficiency, and substantially, application prospect is very wide for no fund investment and safety, economic benefit。The method has practical originality and promotional value。
The present invention is directed to employing wet flue gas desulfurizer and booster fan is not provided with the fired power generating unit that bypath system, booster fan and air-introduced machine are arranged apart。
The foregoing is only the preferred embodiment of the present invention, to adopt limestone/gypsum wet flue gas desulphurization device and booster fan to be not provided with the 600MW fired power generating unit that bypath system, booster fan and air-introduced machine are arranged apart, operational approach is equally applicable to other fired power generating unit such as same type desulfurizer 300MW, 900MW and adopts booster fan stoppage in transit maintenance process in the supercritical thermal power unit cold start with type desulfurizer and operation。It should be pointed out that, for the ordinary skill in the art, without departing from the principles of the present invention, it is also possible to make various deformation and improvement, this also should be considered as protection scope of the present invention。
Claims (11)
1. the startup restoration methods of generating set during a booster fan on-mechanical exception, it is characterised in that: comprise the steps:
Step one: reduce the resistance of flue gas desulphurization system, possesses ventilation condition at desulfurizing technology system, booster fan is when possessing coasting operation, the ventilation group of starting trouble；
Step 2: after ventilation group starts, controls boiler draft group and makes the total blast volume rising of boiler promote the rotor of booster fan to rotate, when total blast volume reaches purging condition, boiler is purged, to ignition of the boiler after purging；
Step 3: increase the load of generating set after igniting, the outlet blast controlling air-introduced machine makes its relatively fluctuation within a narrow range, and makes total blast volume increase in relatively fluctuation within a narrow range；
Step 4: after booster fan possesses entry condition, controls the load of generating set and the total blast volume of boiler, starts booster fan；
Step 5: after booster fan starts, regulator generator group recovers the condition of normal tape splicing load, it is achieved generating set properly functioning。
2. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: it is unimpeded and have the condition passing into flue gas that the desulfurizing technology system described in step one possesses air channel that ventilation condition is desulfurizing technology system, booster fan possesses the lubricating system normal operation that condition is booster fan of coasting operation, booster fan mechanical fault。
3. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterised in that: described step one includes following content:
A) the fraction slurries circulating pump of stoppage in transit desulfurizing technology system is to reduce the resistance of flue gas desulphurization system；
B) regulate booster fan movable vane aperture to open to 100%；
C) starting trouble ventilation unit。
4. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: in described step 3, when controlling the outlet blast of air-introduced machine, ventilation should be slowly increased, and make booster fan movable vane rotate under air quantity promotes, make combustion chamber draft in below 300Pa fuctuation within a narrow range simultaneously；After ignition of the boiler, slowly put into fuel, reduce the fuel combustion impact on blast。
5. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: in described step 3, after ignition of the boiler, before enabling primary air fan, reduce secondary air flow, after primary air fan starts, maintain air quantity and fluctuate in the scope of the 25%～40% of total blast volume。
6. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: the entry condition of the booster fan described in step 4 should meet: when booster fan failture evacuation, booster fan does not reverse, booster fan movable vane aperture is 5%～75%, and compulsory withdrawal movable vane aperture requires the startup permissive condition less than 5%。
7. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: in described step 4, regulate the dynamic leaf divergence of booster fan according to SR and maintain the pressure of air-introduced machine outlet, starting booster fan。
8. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterised in that: after booster fan starts, regulate the experience aperture under the movable vane aperture extremely corresponding air quantity load of booster fan immediately。
9. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: after booster fan starts, the combustion chamber draft of setting boiler and air-introduced machine outlet pressure are to normal value, and wherein the normal range of the combustion chamber draft of boiler is 0Pa～-300Pa；Air-introduced machine outlet pressure controls in the scope of ± 500pa；Guarantee the electric current rated value less than electric current of air-introduced machine；Movable vane aperture is automatically adjusted to normal range, makes movable vane aperture and electric current corresponding relation match；Realize generating set and recover normal tape splicing load。
10. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 1, it is characterized in that: before ventilation group starts, especially by the operation number of the slurry circulating pump on prewashing tower and absorption tower in minimizing desulfurizing technology system to reduce the flue gas resistance of desulfurizing technology system。
11. the startup restoration methods of generating set during booster fan on-mechanical exception according to claim 6, it is characterized in that: the entry condition of the booster fan described in step 4 should meet: when booster fan failture evacuation, booster fan does not reverse, and booster fan movable vane aperture is 5%～50%；And compulsory withdrawal movable vane aperture requires the startup permissive condition less than 5%。
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| 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 |
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