CN106289656A - A kind of vacuum system and Air-Cooling Island leakage inspection method - Google Patents
A kind of vacuum system and Air-Cooling Island leakage inspection method Download PDFInfo
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- CN106289656A CN106289656A CN201510350525.2A CN201510350525A CN106289656A CN 106289656 A CN106289656 A CN 106289656A CN 201510350525 A CN201510350525 A CN 201510350525A CN 106289656 A CN106289656 A CN 106289656A
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Abstract
The present invention provides a kind of vacuum system and Air-Cooling Island leakage inspection method, is applied to Direct Air-cooled Unit, said method comprising the steps of: isolated vacuum system and Air-Cooling Island, and seals the bottom of vacuum system；The tightness of vacuum system is checked by water filling leakage detection mode；If the tightness passed examination of vacuum system, then check the tightness of the pipeline of each row air cooling blower fan group in Air-Cooling Island by airing form；After the tightness of the pipeline of each row air cooling blower fan group all checks, to Air-Cooling Island exhaust pressure relief and vacuum system is discharged water；The method is not only able to check the tightness of Direct Air-cooled Unit hollow cool island; also take into account the tightness inspection of vacuum system; it is capable of determining that leak position is in vacuum system or at Air-Cooling Island; concrete leakage point can also be investigated out; this leakage inspection method is little to existing system hardware modification, low cost, and the leakage detection time is short; can quickly determine leakage point, shorten the time of equipment downtime maintenance.
Description
Technical field
The present invention relates to Power Plant equipment technical field, be specifically related to one and be applied to directly
Connect vacuum system and the Air-Cooling Island leakage inspection method of Air-cooled Unit.
Background technology
The water-saving result of Direct Air-cooled Unit is obvious, and the Air-Cooling Island in Direct Air-cooled Unit accounts for
Ground area is little, and the place that can select is the most, and under island, a lot of places can also recycle,
Therefore, current thermal power plant commonly uses Direct Air-cooled Unit and cools down, and i.e. utilizes
Vacuum system (including steam exhaust device and connected pipeline thereof and valve) is carried by Air-Cooling Island
Steam cool down.Concrete, steam turbine fills doing the vapours completed via steam discharge
Putting the finned tube being delivered to Air-Cooling Island, under the effect of air cooling blower fan, vapours cooling is raw
After becoming condensed water, conveying is back to steam exhaust device again.
Air-Cooling Island is huge due to area, easily produce flowing accelerated corrosion (FAC) and
Steam inlet pipe line and condensed water hydrophobic pipeline leakage, cause condensation water iron-holder, dissolved oxygen,
The foreign ions such as carbon dioxide exceed standard, and make Unit Steam Water system there is burn into salification, knot
The potential safety hazards such as dirt.Simultaneously as pipeline leakage causes vacuum system vacuum to decline,
Turbine back pressure increases, condensing water temperature increases, turbine efficiency declines, gross coal consumption rate
Increase, had a strong impact on the economy of unit operation.Therefore, the tightness inspection of Air-Cooling Island
It is imperative to look into.
For the condenser in vacuum system, generally the mode leakage detection of employing water filling, and pin
To Air-Cooling Island, there is presently no a kind of effective leakage detection scheme, be more not applied to directly
Air-cooled Unit can either carry out leakage detection to vacuum system, Air-Cooling Island can be carried out again
The scheme of leakage detection.
Therefore, a kind of vacuum system and Air-Cooling Island leakage detection scheme are needed badly, to solve above-mentioned skill
Art problem.
Summary of the invention
The present invention is directed to above-mentioned deficiency present in prior art, it is provided that a kind of vacuum system
And Air-Cooling Island leakage inspection method, examine in order to take into account the tightness of Direct Air-cooled Unit hollow cool island
Look into the tightness inspection with vacuum system.
The present invention solves above-mentioned technical problem, adopt the following technical scheme that
The present invention provides a kind of vacuum system and Air-Cooling Island leakage inspection method, is applied to direct sky
Cold group, said method comprising the steps of:
Isolated vacuum system and Air-Cooling Island, and seal the bottom of vacuum system；
The tightness of vacuum system is checked by water filling leakage detection mode；
If the tightness passed examination of vacuum system, then check air cooling by airing form
The tightness of the pipeline of each row air cooling blower fan group in island；
After the tightness of the pipeline of each row air cooling blower fan group all checks, Air-Cooling Island is arranged
Vacuum system is also discharged water by diarrhea due to stagnation of QI pressure.
Preferably, described isolated vacuum system and Air-Cooling Island specifically include: at steam exhaust device
And between Air-Cooling Island enter vapour main pipe line in the first closure plate is set, and at steam exhaust device with empty
In condensed water main pipe line between cool island, the second closure plate is set.
Preferably, described first closure plate at least can pressure 1MPa；Described second closure plate energy
Enough pressure 0.8-1.2MPa.
Preferably, described first closure plate be horizontally placed on described in enter ascent stage of vapour main pipe line
In, and the first closure plate is less than the lower edge of turbine low pressure cylinder exhaust stage blade.
Preferably, the bottom of described sealing vacuum system, specifically include: close and steam discharge
The drain valve on leakage detection flowing line that device is connected, and close steam exhaust device and oxygen-eliminating device
The drain valve on hydrophobic pipeline being connected；
The described tightness being checked vacuum system by water filling leakage detection mode, is specifically included:
By described leakage detection back with water inlet line water filling in steam exhaust device；
When the water level entered in vapour main pipe line reaches the position of the first closure plate, stop to steam discharge
Water filling in device；
Wait preset duration, in ensureing steam exhaust device and the pipeline that is connected with steam exhaust device
Pressure stability；
Check whether vacuum system exists leakage point.
Preferably, described by each row air cooling blower fan group in airing form inspection Air-Cooling Island
The tightness of pipeline, specifically includes:
The steam inlet pipe line conveying compressed air of each row air cooling blower fan group in Air-Cooling Island；
Pressure in the pipeline of each row air cooling blower fan group in detection Air-Cooling Island, when detect
When pressure is more than the threshold value preset, stop carrying to the steam inlet pipe line of each row air cooling blower fan group
Compressed air；
Check the pipeline of described each row air cooling blower fan group with or without air leakage point, if checking gas leakage
Point, then air leakage point described in labelling.
Preferably, the described steam inlet pipe line conveying pressure of each row air cooling blower fan group in Air-Cooling Island
Contracting air, specifically includes: the steam inlet pipe line of each row air cooling blower fan group in Air-Cooling Island successively
Conveying compressed air, or, the steam inlet pipe of each row air cooling blower fan group in Air-Cooling Island simultaneously
Line conveying compressed air.
Preferably, after the tightness of the pipeline of described each row air cooling blower fan group checks,
To Air-Cooling Island exhaust pressure relief, specifically include:
After in Air-Cooling Island, the tightness of the pipeline of whole air cooling blower fan groups all checks, right
The pipeline exhaust pressure relief in the lump of whole air cooling blower fan groups in Air-Cooling Island.
Further, described vacuum system is discharged water after, described method also includes:
After water emptying in vacuum system, recover the connection between vacuum system and Air-Cooling Island.
Further, described method also includes:
If the tightness of vacuum system checks defective, then repair leakage point, and really
After the tightness passed examination of fidelity do-nothing system, check in Air-Cooling Island each by airing form
The tightness of the pipeline of row air cooling blower fan group；
After the tightness of the pipeline of each row air cooling blower fan group checks, to Air-Cooling Island pressure release
And vacuum system is discharged water.
The present invention checks the tightness of vacuum system initially with water filling leakage detection mode, really
After guarantor's vacuum system strictness is qualified, airing form is just used to check Air-Cooling Island hollow cold wind
The tightness of unit pipeline, is not only able to check the tight of Direct Air-cooled Unit hollow cool island
Property, also take into account the tightness inspection of vacuum system, be not only able to determine leak position
It is in vacuum system or at Air-Cooling Island, but also concrete leakage point can be investigated out,
This leakage inspection method is little to existing system hardware modification, low cost, and the leakage detection time is short, it is possible to
Quickly determine leakage point, shorten the time of equipment downtime maintenance, in order to relevant device can
Put into production in time.
Accompanying drawing explanation
Fig. 1 is the structural representation of Direct Air-cooled Unit；
Vacuum system that Fig. 2 provides for the embodiment of the present invention and Air-Cooling Island leakage detection flow chart；
The flow chart of the inspection vacuum system strictness that Fig. 3 provides for the embodiment of the present invention；
Fig. 4 checks each row air cooling blower fan group in Air-Cooling Island for what the embodiment of the present invention provided
The schematic flow sheet of pipeline tightness.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is carried out clearly
Chu, complete description, it is clear that described embodiment is the part enforcement of the present invention
Example rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other enforcement that technical staff is obtained on the premise of not making creative work
Example, broadly falls into the scope of protection of the invention.
The present invention by Direct Air-cooled Unit being divided into vacuum system and Air-Cooling Island two parts,
To two parts leakage detection respectively, the most first vacuum system is carried out water filling leakage detection, guaranteeing vacuum
After system tightness is qualified, then the pipeline of row air cooling blower fan group each in Air-Cooling Island is filled
Gas leakage detection, is not only able to check the tightness of Direct Air-cooled Unit hollow cool island, also takes into account
The tightness inspection of vacuum system.
As it is shown in figure 1, vacuum system include steam exhaust device 1 and with steam exhaust device 1 phase
Connect enters vapour main pipe line 10, and the other end entering vapour main pipe line 10 connects Air-Cooling Island 2.Steam discharge
The top of device 1 connects leakage detection back with water inlet line 20, for being used for steam exhaust device 1 conveying
The liquid of water filling leakage detection, leakage detection back with water inlet line 20 is provided with water intaking valve 201.Steam discharge fills
The bottom putting 1 connects leakage detection flowing line 30 and hydrophobic pipeline 40, leakage detection flowing line
Being provided with drain valve 301 on 30, the other end of hydrophobic pipeline 40 is connected with oxygen-eliminating device 3.
Air-Cooling Island 2 includes that multiple row air cooling blower fan group 4, each row air cooling blower fan group 4 set side by side
Put, the steam inlet pipe line 11 of each row air cooling blower fan group 4 all with enter vapour main pipe line 10 and be connected.
The condensate piping 51 of each row air cooling blower fan group 4 all by condensed water main pipe line 50 with true
The steam exhaust device 1 of do-nothing system is connected.
Taking out of each row air cooling blower fan group 4 of one end of evacuation main pipe line 60 and Air-Cooling Island 2
Vacuum pipeline 61 is connected, and the other end is connected with vacuum pump (not illustrating in figure), respectively arranges sky
The vacuum lines 61 of cold wind unit 4 and the steam inlet pipe line 11 of these row air cooling blower fan group 4
It is connected.In initial start stage, vacuum pump forms negative pressure, it is possible to by each row air cooling blower fan group 4
Vacuum lines 61 by evacuation in the steam inlet pipe line 11 of each row air cooling blower fan group 4,
Each row air cooling blower fan group 4 can be entered smoothly with the steam facilitating steam exhaust device 1 to carry
In steam inlet pipe line 11.
The middle part of evacuation main pipe line 60 connects leakage detection inlet manifold's line 70, leakage detection air inlet
Main pipe line 70 connects source of the gas, the gas in source of the gas, i.e. for inflating the gas of leakage detection, and can
The vacuum lines 61 of each row air cooling blower fan group 4 it is transported to by evacuation main pipe line 60.
Preferably, leakage detection admission line 70 can be thickness 4.5mm, the pipe of a diameter of 40mm
Line, leakage detection inlet manifold's line 70 is provided with total intake valve 701.Evacuation main pipe line 60
Middle part be also connected with leakage detection exhaust main line 80, leakage detection exhaust main line 80 will be for being filled with
In Air-Cooling Island 2, the pipeline of each row air cooling blower fan group 4 (includes steam inlet pipe line 11 and condensed water
Pipeline 51) in gas discharge in the lump, leakage detection exhaust main line 80 is provided with air bleeding valve
801。
The vacuum lines 61 of each row air cooling blower fan group 4 is additionally provided with branch road intake valve
611, in the vacuum system and Air-Cooling Island leakage detection scheme of the present invention, each branch road intake valve 611
Can control whether to inflate leakage detection in the steam inlet pipe line 11 of these row air cooling blower fan group 4.
Below in conjunction with Fig. 1 and Fig. 2, describe technical scheme in detail.
The present invention provides a kind of vacuum system and Air-Cooling Island leakage inspection method, as in figure 2 it is shown,
Comprise the following steps:
Step 1, isolated vacuum system and Air-Cooling Island, and seal the bottom of vacuum system.
Concrete, by entering vapour main pipe line 10 between steam exhaust device 1 and Air-Cooling Island 2
First closure plate 5, and the condensed water house steward between steam exhaust device 1 and Air-Cooling Island 2 are inside set
Second closure plate 6 is set in line 50, in order to isolated vacuum system and Air-Cooling Island 2.Owing to entering
Vapour main pipe line 10 is relatively thick, pipeline diameter about 2-3m, use valve cannot realize effectively every
From, it is merely able to be entered manual installation the first closure plate 5 in vapour main pipe line 10 by workman.And
Condensed water main pipe line 50 is for entering vapour main pipe line 10, and diameter is much smaller, because of
This, the second closure plate 6 can be realized by lock gate hatch, i.e. pre-in condensed water main pipe line 50
Lock gate hatch is first set, Air-Cooling Island 2 normally work time control lock gate hatch open, with open
Condensed water main pipe line 50, and during vacuum system and Air-Cooling Island leakage detection, can pass through
Control lock gate hatch close and at condensed water main pipe line 50 isolated vacuum system and Air-Cooling Island 2.
First closure plate 5 and the second closure plate 6 are used for isolated vacuum system and Air-Cooling Island 2, the
One closure plate 5 is subjected to carry out entering during water filling leakage detection the hydraulic pressure in vapour main pipe line 10, it is preferred that
First closure plate 5 at least can pressure 1MPa, such as, the first closure plate 5 can use thickness
Steel plate for about 20mm.Second closure plate 6 is subjected to be inflated condensed water during leakage detection
Air pressure in main pipe line 50, it is preferred that the second closure plate can pressure 0.8-1.2MPa.
As it is shown in figure 1, Air-Cooling Island 2 is generally located on the platform that 40m is high, steam turbine
Low pressure (LP) cylinder 7 be generally located on the high platform of 12.6m, steam exhaust device 1 again with steamer
The bottom of the low pressure (LP) cylinder 7 of machine is connected, say, that the position of Air-Cooling Island 2 is far above row
The position of vapour device 1, therefore, connect steam exhaust device 1 and Air-Cooling Island 2 enters vapour house steward
Line 10 includes horizontal segment and ascent stage.First closure plate 5 is horizontally placed on into vapour main pipe line 10
Ascent stage in, and the first closure plate 5 is less than the lower edge of turbine low pressure cylinder exhaust stage blade.
Preferably, the first closure plate 5 can be arranged within the ascent stage of vapour main pipe line 10 low
The lower position along about 1m in turbine low pressure cylinder exhaust stage blade.
By arranging the first closure plate 5 and the second closure plate 6 so that Air-Cooling Island 2 fills with steam discharge
Putting and have obvious isolating interface between 1, the inflating pressure of follow-up Air-Cooling Island is looked into
Leakage.
By closing the drain valve on the leakage detection flowing line 30 being connected with steam exhaust device 1
301, and close on the hydrophobic pipeline 40 that steam exhaust device 1 is connected with oxygen-eliminating device 3 hydrophobic
Valve 401, seals the bottom of vacuum system, so that steam exhaust device 1 can be formed airtight
Container.
Step 2, checks the tightness of vacuum system, as truly by water filling leakage detection mode
The tightness passed examination of do-nothing system, then perform step 4, if the tightness of vacuum system
Check defective, then perform step 3.
Concrete, by water filling in steam exhaust device 1, check steam exhaust device 1 and connect
Whether adapter line leaks checks the tightness of vacuum system, is examined by water filling leakage detection mode
Look into that the process of vacuum system strictness is follow-up to be described in detail again.
Power plant produces the highest to water quality requirement, in order to prevent equipment being produced corrosion, at this
In inventive embodiments, water filling leakage detection mode is used to check the tightness of vacuum system, permissible
Demineralized water is injected in steam exhaust device 1.
Step 3, repairs leakage point, after guaranteeing the tightness passed examination of vacuum system,
Perform step 4 and subsequent step.
Concrete, if the tightness of vacuum system checks defective, find leakage point also
After repairing leakage point, also need to check again for the tightness of vacuum system, guaranteeing vacuum system
After the tightness passed examination of system, airing form can be continued through and check in Air-Cooling Island
The tightness of the pipeline of each row air cooling blower fan group, i.e. performs step 4 and subsequent step.
Step 4, checks the pipeline of each row air cooling blower fan group in Air-Cooling Island by airing form
Tightness.
Concrete, in embodiments of the present invention, in order to reduce the cost of leakage detection maintenance, with
And protection environment, compressed air can be selected as source of the gas, in Air-Cooling Island 2, be filled with pressure
Contracting air.Preferably, compressed-air actuated pressure can be 0.3-0.8MPa.
Step 5, after the tightness of the pipeline of each row air cooling blower fan group all checks, empty
Vacuum system is also discharged water by cool island exhaust pressure relief.
After in Air-Cooling Island, the tightness of whole air cooling blower fan group pipelines checks, illustrate true
Do-nothing system leakage detection and Air-Cooling Island leakage detection all complete, now can to Air-Cooling Island exhaust pressure relief also
Vacuum system is discharged water.
It should be noted that can to Air-Cooling Island 2 pressure release and vacuum system be put simultaneously
Water, Air-Cooling Island 2 pressure release required time is shorter, and the time that vacuum system discharges water is longer, lets out
Pressure is prior to having discharged water, after pressure release completes, waterproof when carrying out, can be to finding
The air leakage point of Air-Cooling Island 2 is repaired.
Concrete, it is first-selected by opening the air bleeding valve 801 on leakage detection exhaust main line 80,
The pipeline of row air cooling blower fan group each in Air-Cooling Island (is included steam inlet pipe line 11 and condensate pipe
Line 51) in compressed air discharge, compressed air is nontoxic, can be directly discharged into big
Gas.Then, by opening the drain valve 301 on leakage detection flowing line 30, steam discharge is filled
Put 1 to discharge with the demineralized water entered in vapour main pipe line 10.
Preferably, in order to reduce to Air-Cooling Island inflation, the frequency of aerofluxus, in Air-Cooling Island
After all the tightness of the pipeline of air cooling blower fan group all checks, can be in Air-Cooling Island
The pipeline exhaust pressure relief in the lump of whole each row air cooling blower fan groups.Concrete, set by unlatching
Put the air bleeding valve 801 on leakage detection exhaust main line 80, whole Air-Cooling Island aerofluxus will be let out
Pressure.
By above-mentioned steps 1-5 it can be seen that first use water filling leakage detection mode to check vacuum
The tightness of system, after guaranteeing that vacuum system strictness is qualified, just uses airing form
Check the tightness of the pipeline of each row air cooling blower fan group in Air-Cooling Island, use this segmentation to look into
The method of leakage, or the leakage point of vacuum system can be directly found, or can be direct
Get rid of the probability of vacuum system leakage.Follow-up it is inflated leakage detection for Air-Cooling Island, fills
Gas scope is limited in Air-Cooling Island, and the gas for leakage detection being filled with will not leak to vacuum
In system, it is ensured that the effect of Air-Cooling Island leakage detection.The present invention is not only able to check direct sky
The tightness of cold group hollow cool island, has also taken into account the tightness inspection of vacuum system, no
But be capable of determining that leak position is in vacuum system or at Air-Cooling Island, but also can
Investigating out concrete leakage point, this leakage inspection method is little to existing system hardware modification, cost
Low, the leakage detection time is short, it is possible to quickly determine leakage point, shorten equipment downtime maintenance time
Between.
Further, as in figure 2 it is shown, described method can also comprise the following steps:
Step 6, after the water emptying in vacuum system, recover vacuum system and Air-Cooling Island it
Between connection.
Concrete, owing to the required duration that discharges water is longer than duration needed for pressure release, in vacuum system
Water emptying after, the compression that illustrate in Air-Cooling Island 2 in the pipeline of each row air cooling blower fan group sky
Gas is drained, at this point it is possible to recover by removing the first closure plate 5 and the second closure plate 6
Connection between vacuum system and Air-Cooling Island 2, thus put into operation for Direct Air-cooled Unit
Ready.
Below in conjunction with Fig. 3, describe in detail and check vacuum system by the way of water filling leakage detection
The flow process of tightness, as it is shown on figure 3, this flow process comprises the following steps:
Step 201, by the water filling in steam exhaust device of leakage detection back with water inlet line.
Concrete, open water intaking valve 201, by leakage detection back with water inlet line 20 to steam exhaust device
Demineralized water is injected in 1.
Step 202, when the water level entered in vapour main pipe line reaches the position of the first closure plate,
Stop water filling in steam exhaust device.
Concrete, owing to being turned off the drain valve on leakage detection flowing line 30 in step 1
301 and hydrophobic pipeline 4 on drain valve 401, thus by the sealed bottom of steam exhaust device 1,
And the first closure plate 5 was set within the ascent stage entering vapour main pipe line 10, therefore, to row
The demineralized water injected in vapour device 1 enters after vapour main pipe line 10, steam exhaust device 1 with enter
Vapour main pipe line 10 is the formation of linker, the liquid level in steam exhaust device 1 with enter vapour main pipe line
Water level at the ascent stage of 10 always remains in same level.
Owing to the first closure plate 5 was horizontally placed within the ascent stage of vapour main pipe line 10, and the
One closure plate 5 is less than the lower edge of turbine low pressure cylinder exhaust stage blade, in entering vapour main pipe line 10
Water level when reaching the position of the first closure plate 5, illustrate that the water level in steam exhaust device 1 also reaches
Arrive corresponding position, now, the water intaking valve 201 in leakage detection back with water inlet line 20 can have been closed,
To stop to steam exhaust device 1 water filling.
In order to avoid turbine water induction, cause security incident, the water level in steam exhaust device 1
Need the low pressure (LP) cylinder 7 with steam turbine to have a certain distance, steam turbine at least can be had low
The lower edge of the exhaust stage blade of cylinder pressure.
Step 203, wait preset duration, with ensure steam exhaust device and with steam exhaust device phase
Pressure stability in pipeline even.
Concrete, stop in steam exhaust device 1 after water filling, after needing to wait preset duration
Reexamine leakage point, it is intended that make steam exhaust device 1 and be connected with steam exhaust device 1
Pipeline in pressure within the sufficiently long time, reach equilibrium, stable.
Preferably, described preset duration is more than or equal to 24 hours.
Step 204, checks whether vacuum system exists leakage point.
Stop after preset duration described in steam exhaust device 1 water filling, start to check vacuum system
Whether there is leakage point.
First check the outer leak source of vacuum system, reexamine the interior leak source of vacuum system.Specifically
, can directly observe steam exhaust device 1 and the outward appearance of connected pipeline by artificial, determine
The phenomenon whether there is seepage, dripping, for interior leak source, outer leak source is easier to
Find.After outer finding leak source, open the equipment and pipeline being connected with steam exhaust device 1
Valve or flange, if the flange of the valve of this equipment or pipeline has water, then illustrate
Demineralized water in steam exhaust device 1 has leaked in this equipment or pipeline, thus can be true
Make interior leak source.
It should be noted that can also be by steam exhaust device 1 in observation timing statistics
Water level decreasing situation judges whether leakage point, such as, if in 24 hours, and steam discharge
Water level decreasing in device 1 is more than 0.2-0.5%, then explanation vacuum system exists leakage point,
Need to find out further the position of leakage point.
If not checking leakage point in vacuum system, then perform step 4, carry out sky
The inspection of cool island tightness.If checking leakage point in vacuum system, then perform step
Rapid 3, repair leakage point, and after whole leakage points are repaired, check again for vacuum system
Whether system exists leakage point, only after not checking leakage point, just can perform step 4
And subsequent step.
Below in conjunction with Fig. 4, describe in detail and check that Air-Cooling Island is tight by the way of inflation leakage detection
The flow process of close property, as shown in Figure 4, this flow process comprises the following steps:
Step 301, the steam inlet pipe line conveying compression of each row air cooling blower fan group in Air-Cooling Island
Air.
When the water level entered in vapour main pipe line 10 reaches the position of the first closure plate 5, Air-Cooling Island
2 have used water segregation with the steam discharge part (i.e. steam exhaust device 1) of the low pressure (LP) cylinder 7 of steam turbine
Coming, the low pressure (LP) cylinder 7 of steam turbine no longer connects with Air-Cooling Island 2, now to Air-Cooling Island 2
During interior inflation, gas will not be leaked by the low pressure (LP) cylinder 7 of steam exhaust device 1 and steam turbine,
Such that it is able to check the tightness of Air-Cooling Island part.
Concrete, can the steam inlet pipe of each row air cooling blower fan group 4 in Air-Cooling Island 2 successively
Line 11 carries compressed air, or, each row air cooling blower fan group 4 in Air-Cooling Island 2 simultaneously
Steam inlet pipe line 11 carry compressed air.Each row air cooling blower fan group in Air-Cooling Island 2 simultaneously
It is preferred version that the steam inlet pipe line 11 of 4 carries compressed air.
If the steam inlet pipe line 11 conveying pressure of each row air cooling blower fan group 4 in Air-Cooling Island 2 successively
Contracting air, then open the branch road air inlet in total intake valve 701 and corresponding air cooling blower fan group 4
Valve 611, by compressed air via leakage detection inlet manifold's line 70, evacuation main pipe line 60 and
The vacuum lines 61 of this row air cooling blower fan group 4 is delivered to entering of this row air cooling blower fan group 4
In steam pipe line 11 and condensate piping 51.
If the steam inlet pipe line 11 conveying pressure of each row air cooling blower fan group 4 in Air-Cooling Island 2 simultaneously
Contracting air, then open the branch road air inlet in total intake valve 701 and Ge Lie air cooling blower fan group 4
Valve 611 (in this case, also may be used by the branch road intake valve 611 of each row air cooling blower fan group 4
To be not provided with), by compressed air via leakage detection inlet manifold's line 70, evacuation main pipe line
The vacuum lines 61 of 60 and Ge Lie air cooling blower fan groups 4 is delivered to each row air cooling blower fan group 4
Steam inlet pipe line 11 and condensate piping 51 in.
Step 302, the pressure in the pipeline of each row air cooling blower fan group in detection Air-Cooling Island,
If the pressure detected is more than the threshold value preset, stop entering vapour to each row air cooling blower fan group
Pipelined compressed air.
Concrete, can pressure transducer 8 be set on inlet manifold's line 10, be used for examining
Surveying into the pressure in vapour main pipe line 10, the force value detected when pressure transducer 8 is more than
During with default threshold value, close total intake valve 701, to stop to Air-Cooling Island conveying compression sky
Gas.Preferably, described threshold value is 0.1-0.3MPa.
It should be noted that owing to the first closure plate 5 and the second closure plate 6 are by Air-Cooling Island
2 isolation, when simultaneously in Air-Cooling Island 2 the steam inlet pipe line 11 of each row air cooling blower fan group 4 defeated
When sending compressed air, enter vapour main pipe line 10, condensed water main pipe line 50, each row air cooling blower fan
The steam inlet pipe line 11 of group all connects with condensate piping 51, and in this case, pressure passes
Sensor 8 can be arranged on one of underground pipelines upper: enters vapour main pipe line 10, condensed water house steward
Line 50, the steam inlet pipe line 11 of any row air cooling blower fan group and condensate piping 51.
Step 303, check the pipeline of each row air cooling blower fan group with or without air leakage point, if find
Air leakage point, then air leakage point described in labelling.
Concrete, can be by pipeline (the steam inlet pipe line 11 in each row air cooling blower fan group 4
With condensate piping 51) the mode of surface sprinkling suds search air leakage point, if finding
Air leakage point, then labelling air leakage point, in order to follow-up repair.
The vacuum system of the present invention and Air-Cooling Island leakage inspection method, first against vacuum system portion
Dividing and use water filling leakage detection mode to check tightness, the position of vacuum system is relatively low, relates to
Pipeline, valve are more, use water filling leakage detection mode to be easier to find leak source.Guaranteeing very
After do-nothing system tightness passed examination, then use inflation leakage detection mode for Air-Cooling Island part
Check tightness, Air-Cooling Island kept apart with vacuum system, it is to avoid leakage detection gas leaks,
Leakage detection is better.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present
And the illustrative embodiments used, but the invention is not limited in this.For ability
For those of ordinary skill in territory, in the situation without departing from spirit and substance of the present invention
Under, various modification and improvement can be made, these modification and improvement are also considered as the present invention's
Protection domain.
Claims (10)
1. vacuum system and an Air-Cooling Island leakage inspection method, be applied to Direct Air-cooled Unit,
It is characterized in that, said method comprising the steps of:
Isolated vacuum system and Air-Cooling Island, and seal the bottom of vacuum system；
The tightness of vacuum system is checked by water filling leakage detection mode；
If the tightness passed examination of vacuum system, then check air cooling by airing form
The tightness of the pipeline of each row air cooling blower fan group in island；
After the tightness of the pipeline of each row air cooling blower fan group all checks, Air-Cooling Island is arranged
Vacuum system is also discharged water by diarrhea due to stagnation of QI pressure.
2. the method for claim 1, it is characterised in that described isolated vacuum system
System and Air-Cooling Island specifically include: entering in vapour main pipe line between steam exhaust device and Air-Cooling Island
Set in first closure plate, and the condensed water main pipe line between steam exhaust device and Air-Cooling Island are set
Put the second closure plate.
3. method as claimed in claim 2, it is characterised in that described first closure plate is extremely
Less can pressure 1MPa；Described second closure plate can pressure 0.8-1.2MPa.
4. method as claimed in claim 2, it is characterised in that described first closure plate water
Put down in the ascent stage entering vapour main pipe line described in being arranged at, and the first closure plate is low less than steam turbine
The lower edge of cylinder pressure exhaust stage blade.
5. method as claimed in claim 4, it is characterised in that described sealing vacuum system
The bottom of system, specifically includes: close on the leakage detection flowing line being connected with steam exhaust device
Drain valve, and close the drain valve on the hydrophobic pipeline that steam exhaust device is connected with oxygen-eliminating device；
The described tightness being checked vacuum system by water filling leakage detection mode, is specifically included:
By described leakage detection back with water inlet line water filling in steam exhaust device；
When the water level entered in vapour main pipe line reaches the position of the first closure plate, stop to steam discharge
Water filling in device；
Wait preset duration, in ensureing steam exhaust device and the pipeline that is connected with steam exhaust device
Pressure stability；
Check whether vacuum system exists leakage point.
6. the method for claim 1, it is characterised in that described by inflation side
Formula checks the tightness of the pipeline of each row air cooling blower fan group in Air-Cooling Island, specifically includes:
The steam inlet pipe line conveying compressed air of each row air cooling blower fan group in Air-Cooling Island；
Pressure in the pipeline of each row air cooling blower fan group in detection Air-Cooling Island, when detect
When pressure is more than the threshold value preset, stop carrying to the steam inlet pipe line of each row air cooling blower fan group
Compressed air；
Check the pipeline of described each row air cooling blower fan group with or without air leakage point, if checking gas leakage
Point, then air leakage point described in labelling.
7. method as claimed in claim 6, it is characterised in that described in Air-Cooling Island
The steam inlet pipe line conveying compressed air of each row air cooling blower fan group, specifically includes: successively to sky
The steam inlet pipe line conveying compressed air of each row air cooling blower fan group in cool island, or, simultaneously to
The steam inlet pipe line conveying compressed air of each row air cooling blower fan group in Air-Cooling Island.
8. the method for claim 1, it is characterised in that described each row air cooling wind
After the tightness of the pipeline of unit checks, to Air-Cooling Island exhaust pressure relief, specifically include:
After in Air-Cooling Island, the tightness of the pipeline of whole air cooling blower fan groups all checks, right
The pipeline exhaust pressure relief in the lump of whole air cooling blower fan groups in Air-Cooling Island.
9. the method for claim 1, it is characterised in that described to vacuum system
After discharging water, described method also includes:
After water emptying in vacuum system, recover the connection between vacuum system and Air-Cooling Island.
10. the method as described in any one of claim 1-9, it is characterised in that described
Method also includes:
If the tightness of vacuum system checks defective, then repair leakage point, and really
After the tightness passed examination of fidelity do-nothing system, check in Air-Cooling Island each by airing form
The tightness of the pipeline of row air cooling blower fan group；
After the tightness of the pipeline of each row air cooling blower fan group checks, to Air-Cooling Island pressure release
And vacuum system is discharged water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510350525.2A CN106289656A (en) | 2015-06-23 | 2015-06-23 | A kind of vacuum system and Air-Cooling Island leakage inspection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510350525.2A CN106289656A (en) | 2015-06-23 | 2015-06-23 | A kind of vacuum system and Air-Cooling Island leakage inspection method |
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| CN106289656A true CN106289656A (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510350525.2A Pending CN106289656A (en) | 2015-06-23 | 2015-06-23 | A kind of vacuum system and Air-Cooling Island leakage inspection method |
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Application publication date: 20170104 |