CN100432612C - Shutdown maintaining method for directly air cooling system - Google Patents
Shutdown maintaining method for directly air cooling system Download PDFInfo
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- CN100432612C CN100432612C CNB2007100172741A CN200710017274A CN100432612C CN 100432612 C CN100432612 C CN 100432612C CN B2007100172741 A CNB2007100172741 A CN B2007100172741A CN 200710017274 A CN200710017274 A CN 200710017274A CN 100432612 C CN100432612 C CN 100432612C
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Abstract
The invention discloses a maintenance method on air cooling system, which first discharges the water in system, and cleans out the accumulated water in the U-shaped connecting tube between a deoxidizer and a heat well, adds temporary block plate in the channel between the deoxidizer and the low-pressure cylinder discharge area, and arranges humidity sensors in the manholes of discharge tube, expander, and low-pressure cylinder, feeds gas inhibitor along with clean dry air generated by fan or dehumidifier into the air cooling system, to adhere the inhibitor on the inner surface of the cooling system, to form membrane at 1-2 molecule thick, to restrain the corrosion on the surface of metal, and one-way flows the clean dry air to reduce the humidity under 50%, and detects the humidity in the cooling system. The invention has simple operation and better corrosion resistance.
Description
Technical field
The invention belongs to the technical field of the direct air cooling system maintenance outage of Thermal Power Station, be specifically related to a kind of shutdown maintaining method (A protecting method for air coolingcondencetion system during it is shuting-down) of direct air cooling system.This method is earlier under moisture conditions, and vapour phase inhibitor is blasted direct air cooling system, stops the corrosion of metal under moistening environment, and residual steam in the removal system fast makes direct air cooling system enter the state of dry preservation then.
Background technology
Big capacity thermal power generation unit in the water-deficient area, if utilize direct air cooling system, the steam discharge with surrounding air condensation steam turbine then is called Direct Air-cooled Unit with this unit.The use of Direct Air-cooled Unit was just inchoate in recent years, particularly in the northern Shensi, the coal producing region of some lacks of water such as Shanxi, Inner Mongol, Ningxia.Direct Air-cooled Unit principle water-steam system figure sees shown in Figure 1.Label 4 among Fig. 1 is direct air cooling system, is also referred to as air cooling tubes condenser, and its effect is that the heat with turbine discharge is delivered in the air, thereby makes turbine discharge be condensed into water.
1, direct air cooling system (Air Cooling Condencetion System is called for short the ACC system) is made up of blow-off line, steam distributing pipe road, heat exchanger tube, condensing water conduit, condensate water collection conduit etc.Steam from turbine low pressure cylinder enters direct air cooling system through the main steam discharge pipe, and enters condenser bundles by the steam-distributing pipe header.Condenser element comprises the finned tube that is arranged in parallel.Steam cools off the horizontal tube outer surface that skims over of air simultaneously in the pipe internal surface condensation.The steam-distributing pipe header is positioned at the top of roof shape tube bank, and welds together with tube bank as parallel-flow condenser.The tube connector of tube bank bottom directly is connected with the condensate water header, and header is delivered to the condensate drain pipe road with condensate water and steam is delivered to the contraflow condenser tube bank.There is a bobbin carriage on the top of contraflow condenser tube bank, and the adapter of air on bobbin carriage is extracted.Pump-line is connected with pumped vacuum systems.
2, the condensing equipment of direct air cooling system is that (the total heat exchange area of 300MW Direct Air-cooled Unit direct air cooling system is about 656049m to a huge metal heat sink
2, and the direct-cooled unit direct air cooling system of a 600MW heat exchange surface is about 1300000m
2).The material major part of this huge metal heat sink of direct air cooling system is a carbon steel, it is generally acknowledged corrosion of Carbon Steel based on electrochemical corrosion, and electrochemical corrosion is based on the oxygen uptake corrosion.Fig. 2 provides the corrosion data of carbon steel under different air humiditys.Among the figure as can be seen, when relative humidity in the air greater than 60% the time, corrosion of Carbon Steel speed is obviously accelerated.And air cooling tower is during stopping transport, and it is saturated that internal environment humidity, relative humidity approach, so the oxygen uptake serious corrosion.From the situation of present feedback, after the stoppage in transit of direct air cooling system, do not have good method to maintain, serious corrosion, after unit started once more, the condensate water iron content that condenses through direct air cooling system was very high.
3, the manhole door distribution situation of parts such as direct air cooling system and low pressure (LP) cylinder, condensate tank, deaerating plant, accident dewatering capacity-enlarging device.Manhole distribution situation of this part and humidity sensor are seen shown in Figure 3.
A., 4 manholes, aperture 500mm are arranged on the low pressure (LP) cylinder cylinder body;
B. exhaust equipment of LP casing road (6 rice diameter) horizontal segment has 1 manhole, aperture 600mm;
C. the steam-distributing pipe house steward has 1 manhole on the air cooling tower;
D., 1 manhole is arranged respectively on each arm of steam-distributing pipe on the air cooling tower;
E. deaerating plant has upper and lower 2 manholes;
F. accident dewatering capacity-enlarging device has 1 manhole.
4, the agent structure of rotary dehumidifier is the dry runner of a honeycomb that constantly rotates.Dry runner is the critical component of adsorption moisture in the dehumidifier, and it is made of the corrugated medium that special composite heat resistance material is made.Be loaded with hygroscopic agent in the corrugated medium.Rotary dehumidifier has following outstanding advantage:
A. moisture removal is big, the efficient height.Rotary dehumidifier can be reduced to air dew point 10 ℃～-60 ℃ easily;
B. equipment volume is little, simple installation.
C. easy operating is reliable.
D. long-time running, easy maintenance.
5, vapour phase inhibitor (Vapor Phase Corrosion Inhibitor, Molecular Adsorption VPI) is in the metal surface, forming thickness is 1～2 film that molecule is thick, suppresses the corrosion of metal surface.Even big in relative humidity, temperature is high and the acid medium condition under, also have very strong antiseptic power.The main type of using of VPI has aromatic compound, aliphatic acid and mineral wet goods at present.
Summary of the invention
The objective of the invention is to, a kind of shutdown maintaining method of direct air cooling system is provided, when this method is stopped using in direct air cooling system, in direct air cooling system, blast earlier vapour phase inhibitor, stop the corrosion of metal under moistening environment.Then blast dustless dry air, residual steam in the removal system fast drops to relative humidity in the system below 50%, makes direct air cooling system enter the state of dry preservation.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of shutdown maintaining method of direct air cooling system is characterized in that, maintains after this method butt joint air cooling system is stopped transport, and specifically comprises the following steps:
After direct air cooling system is stopped transport, elder generation hydrophobic in the exhaust system, and the labor cleaning goes out the ponding in " U " shape tube connector between deaerating plant and the hot well, passage at deaerating plant and low pressure (LP) cylinder exhaust gas region adds interim closure plate, and in manhole inside, exhaust equipment of LP casing road, accident dewatering capacity-enlarging device manhole inside, low pressure (LP) cylinder cylinder body manhole inside is provided with humidity sensor, humidity sensor is positioned at the import of dustless dry air and the outlet place of system's moisture;
Adopt big flow blower fan or rotary dehumidifier that dustless dry air is provided, at first vapour phase inhibitor is blasted direct air cooling system from a manhole of direct air cooling system with dustless dry air, carry the dustless dry air of vapour phase inhibitor, be blown into from the manhole of exhaust equipment of LP casing road horizontal segment, make vapour phase inhibitor be attached to the direct air cooling system metallic interior surface, forming thickness is 1～2 film that molecule is thick, to suppress the corrosion of metal surface;
Then blast dustless dry air, per hour the dustless dry air amount that is blown into to direct air cooling system is 1～5 times of direct air cooling system volume; Dustless dry air divides two-way, and one the road blows out from low pressure (LP) cylinder cylinder body manhole, and one the road blows out from accident dewatering capacity-enlarging device manhole, produces one-way flow, after the direct air cooling system internal relative humidity is less than 50%, stops to blast dustless dry air;
After dustless dry air stops, the relative humidity that humidity sensor detects in the continuous monitoring direct air cooling system when the relative humidity of direct air cooling system inside exceeds 50%, blasts dustless dry air once more, so circulation makes the interior relative humidity of direct air cooling system all the time less than 50%.
Method of the present invention for the maintenance outage of direct air cooling system have economy, fast, use simple, the desirable characteristics of antiseptic effect.
Description of drawings
Fig. 1 is Direct Air-cooled Unit principle water-steam system figure.Label among the figure is represented respectively: 1, boiler, 2, superheater, 3, steam turbine, 4, direct air cooling system, 5, condensate pump, 6, condensate-scavenging installation, 7, bypath system, 8, low-pressure heater, 9, oxygen-eliminating device, 10, feed pump, 11, high-pressure heater, 12, condensate tank, 13, air cooling blower fan, 14, generator.
Fig. 2 is the corrosion data of carbon steel under different air humiditys.
Fig. 3 is a direct air cooling system manhole distribution map.
The present invention is described in further detail below in conjunction with embodiment that principle and inventor provide.
The specific embodiment
According to method of the present invention, after direct air cooling system is stopped using, by draining system, the remaining ponding of part such as emptying hot well, deaerating plant, blow-off line of trying one's best earlier.Open exhaust equipment of LP casing road horizontal segment manhole, drain the ponding in " U " shape tube connector between deaerating plant and the hot well with pump.Add interim closure plate, the passage of sealing deaerating plant and low pressure (LP) cylinder exhaust gas region, the short-channel of sealing low pressure (LP) cylinder and condensate tank, and in manhole inside, exhaust equipment of LP casing road, accident dewatering capacity-enlarging device manhole inside, low pressure (LP) cylinder cylinder body manhole inside etc. locate to be provided with humidity sensor;
Adopt big flow blower fan or rotary dehumidifier that dustless dry air is provided, and will carry the wind of vapour phase inhibitor, be blown into from the manhole of exhaust equipment of LP casing road horizontal segment, divide two-way, the one road blows out from low pressure (LP) cylinder cylinder body manhole, and one the road blows out from accident dewatering capacity-enlarging device manhole, produce one-way flow, make vapour phase inhibitor be attached to the direct air cooling system metallic interior surface, forming thickness is 1～2 film that molecule is thick, thereby suppresses the corrosion of metal surface.
Blast clean dustless dry air source and have two kinds: the one, in the very dry place of northern area, when outside air relative humidity less than 50% the time, by filter clean dustless dry air is blasted by big flow blower fan; Greater than 50% place, then provide dustless dry air in relative humidity by big flow dehumidifier.Internal system relative humidity stops to blast dustless dry air less than after 50%.Relative humidity in the continuous monitor system exceeds at 50% o'clock then, blasts dustless dry air again, makes the interior relative humidity of direct air cooling system all the time less than 50%.
Embodiment 1:
After direct air cooling system is stopped transport, open the hydrophobic door in bottom, exhaust equipment of LP casing road, the hydrophobic door of hot well, the remaining water of parts such as emptying hot well, deaerating plant, blow-off line, radiator as far as possible.Open exhaust equipment of LP casing road horizontal segment manhole, the labor cleaning goes out the ponding in " U " shape tube connector between deaerating plant and the hot well, adds interim closure plate at the passage of deaerating plant and low pressure (LP) cylinder exhaust gas region; Open a low pressure (LP) cylinder cylinder body manhole, open accident dewatering capacity-enlarging device manhole.The worn-out mouthful container that vapour phase inhibitor is housed is put in the distance of inner 1 meter of exhaust equipment of LP casing road horizontal segment manhole.And, then blower fan or the dustless dry air outlet of rotary dehumidifier are connected to exhaust equipment of LP casing road horizontal segment manhole at above-mentioned hand-hole installation humidity sensor, humidity sensor is installed here equally; Start blower fan or rotary dehumidifier from blasting dustless dry air here, discharge from low pressure (LP) cylinder manhole and accident dewatering capacity-enlarging device hand-hole, dustless dry air amount hourly is 1～5 times of air cooling tower volume.The placement amount of vapour phase inhibitor is that 4 hours amounts of all volatilizing are (because of different vapour phase inhibitors volatilization concentration differences, here according to the use amount of time to vapour phase inhibitor, vapour phase inhibitor adopts the product of market routine, as bicyclohexylamine nitrite, sad dicyclohexyl amine, carbonic acid cyclohexyl ester, phytic acid etc.).Continue to blast dustless dry air, to the outlet relative humidity of low pressure (LP) cylinder manhole and accident dewatering capacity-enlarging device manhole less than till 50%.Monitor the relative humidity (i.e. monitoring is installed in the humidity sensor of exhaust equipment of LP casing road horizontal segment manhole, low pressure (LP) cylinder manhole and accident dewatering capacity-enlarging device manhole outlet) in the direct air cooling system then, exceed 50% allowed band at humidity sensor after, start blower fan or rotary dehumidifier, feed dustless dry air again, make to remain in the system below 50% the relative humidity.
Embodiment 2:
Different is that relative humidity is controlled in 45% for present embodiment and embodiment 1.Dustless dry air and vapour phase inhibitor are to be blown into from accident dewatering capacity-enlarging device manhole, discharge from low pressure (LP) cylinder row cylinder body manhole, allow the circulation passage of dustless dry air and vapour phase inhibitor be one the tunnel exactly, are not the two-way among the embodiment 1.
All the other are with embodiment 1.
Embodiment 3:
Different is that the dustless dry air that blasts improves dustless drying air temperature by electric heater unit, makes wind-warm syndrome reach 45 ℃ for present embodiment and embodiment 1.
All the other are with embodiment 1.
Certainly, a kind of shutdown maintaining method invention of direct air cooling system of the present invention is not limited to the foregoing description, needs only the scope that provides in technical scheme of the present invention through repeatedly experiment showed, of applicant, all can reach purpose of the present invention.
Claims (3)
1. the shutdown maintaining method of a direct air cooling system, this method maintain after direct air cooling system is stopped transport, and it is characterized in that, specifically comprise the following steps:
After direct air cooling system is stopped transport, elder generation hydrophobic in the exhaust system, and the labor cleaning goes out the ponding in " U " shape tube connector between deaerating plant and the hot well, passage at deaerating plant and low pressure (LP) cylinder exhaust gas region adds interim closure plate, and in manhole inside, exhaust equipment of LP casing road, accident dewatering capacity-enlarging device manhole inside, low pressure (LP) cylinder cylinder body manhole inside is provided with humidity sensor, humidity sensor is positioned at the import of dustless dry air and the outlet place of system's moisture;
Adopt big flow blower fan or rotary dehumidifier that dustless dry air is provided, at first vapour phase inhibitor is blasted direct air cooling system from a manhole of direct air cooling system with dustless dry air, carry the dustless dry air of vapour phase inhibitor, be blown into from the manhole of exhaust equipment of LP casing road horizontal segment, make vapour phase inhibitor be attached to the direct air cooling system metallic interior surface, forming thickness is 1～2 film that molecule is thick, to suppress the corrosion of metal surface;
Then blast dustless dry air, per hour the dustless dry air amount that is blown into to direct air cooling system is 1～5 times of direct air cooling system volume; Dustless dry air divides two-way, and one the road blows out from low pressure (LP) cylinder cylinder body manhole, and one the road blows out from accident dewatering capacity-enlarging device manhole, produces one-way flow, after the direct air cooling system internal relative humidity is less than 50%, stops to blast dustless dry air;
After dustless dry air stops, the relative humidity that humidity sensor detects in the continuous monitoring direct air cooling system when the relative humidity of direct air cooling system inside exceeds 50%, blasts dustless dry air once more, so circulation makes the interior relative humidity of direct air cooling system all the time less than 50%.
2. the shutdown maintaining method of direct air cooling system according to claim 1 is characterized in that, the placement amount of described vapour phase inhibitor is 4 hours all amounts of volatilization.
3. the shutdown maintaining method of direct air cooling system according to claim 1 is characterized in that, described dustless dry air is the dustless dry air of electric heater unit heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100172741A CN100432612C (en) | 2007-01-23 | 2007-01-23 | Shutdown maintaining method for directly air cooling system |
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| CNB2007100172741A CN100432612C (en) | 2007-01-23 | 2007-01-23 | Shutdown maintaining method for directly air cooling system |
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| CN101017060A CN101017060A (en) | 2007-08-15 |
| CN100432612C true CN100432612C (en) | 2008-11-12 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102288064B (en) * | 2011-06-17 | 2013-06-12 | 河北省电力建设调整试验所 | Protection method for joint stop of air cooling island and unit |
| CN103215600A (en) * | 2013-04-02 | 2013-07-24 | 国家电网公司 | Gas phase inflation protection device of direct air cooling system and protection method thereof |
| CN103322828A (en) * | 2013-05-23 | 2013-09-25 | 西安热工研究院有限公司 | Shutdown protection device of direct air cooled condenser of thermal power plant |
| CN103541871A (en) * | 2013-11-11 | 2014-01-29 | 上海电力学院 | Self-volatilizing active wind generator cabin dehumidification rust prevention device |
| CN108548169A (en) * | 2018-03-23 | 2018-09-18 | 上海电力学院 | A kind of combined cycle generating unit boiler Shut-down Protection system and application method |
| CN110004447A (en) * | 2019-04-01 | 2019-07-12 | 国网浙江平湖市供电有限公司 | A kind of anti-corrosion method of electric system active service steel pipe pole inner wall |
| CN111429601A (en) * | 2020-03-30 | 2020-07-17 | 杨志 | Automatic inspection device for air cooling island |
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