CN107255270A - A kind of exceeded administering method of thermal power generation unit condensate dissolved oxygen content - Google Patents
A kind of exceeded administering method of thermal power generation unit condensate dissolved oxygen content Download PDFInfo
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- CN107255270A CN107255270A CN201710516351.1A CN201710516351A CN107255270A CN 107255270 A CN107255270 A CN 107255270A CN 201710516351 A CN201710516351 A CN 201710516351A CN 107255270 A CN107255270 A CN 107255270A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a kind of exceeded administering method of thermal power generation unit condensate dissolved oxygen content, air leak detection and improvement including vacuum system in thermal power generation unit, the adjustment of thermal power generation unit hollow cold unit condensate undercooling are administered, the transformation of the water charging system of thermal power generation unit, come in and go out axle envelope heater condensate and steam feed pump in air gate adjustment and thermal power generation unit of condensate pump seals the transformation of water water recovery apparatus in thermal power generation unit, and this method can realize the exceeded improvement of thermal power generation unit condensate dissolved oxygen content.
Description
Technical field
The invention belongs to thermoelectric generator technical group field, it is related to a kind of thermal power generation unit condensate dissolved oxygen content exceeded
Administering method.
Background technology
Thermal power generation condensate dissolved oxygen is one of important monitoring indicators of thermal power generation unit, the height of condensate dissolved oxygen
Safety, the economical operation of unit can be directly affected, the regulation requirement supervised according to thermal power generating technology, wet type generating set condenses
Water dissolved oxygen content does not allow more than 30 μ g/L, and Air-cooled Unit condensate dissolved oxygen content does not allow more than 100 μ g/L, but domestic
The problem of thermal power generation unit generally existing Excessive Dissolved Oxygen in Condensate of operation, the safe operation to unit brings extremely big danger
Evil.
The excessive harm caused to unit of oxygen content of condensate mainly has following several respects：1) condensate dissolved oxygen is significantly
It is exceeded or long-term unqualified, the generation of condensing water conduit equipment corrosion and stokehold therrmodynamic system iron dirt can be accelerated.Condense water-soluble
Solve oxygen severe overweight when, also result in after oxygen-eliminating device feed water dissolved oxygen it is exceeded, influence boiler heating surface heat transfer efficiency, accelerate boiler
The accident such as pipe-line equipment corrosion and scaling or even generation boiler tube bursting, the serious safety for threatening unit, economical operation；2) in steam turbine
Heat regenerative system in, use surface-type heat exchanger, the corrosion product of equipment is attached on heat-transfer surface, form loose attachment
Layer, while containing hyperoxia in condensate, can make to form thin film on heat-transfer surface, increase heat exchanged thermoresistance, reduction circulation
The thermal efficiency；3) in order to ensure the operation of stabilizing the economy of unit, condenser necessarily be in the vacuum state of height.Excessive air leakage
Enter condenser, vacuum can be caused to reduce, on the one hand can influence the economy of unit, exerting oneself for unit will be reduced when serious；It is another
Aspect, also causes the pumping load increase of extract system, adds station-service electricity.
The content of the invention
It is an object of the invention to the shortcoming for overcoming above-mentioned prior art, there is provided a kind of condensation of thermal power generation unit is water-soluble
The exceeded administering method of oxygen amount is solved, this method can realize the exceeded improvement of thermal power generation unit condensate dissolved oxygen content.
To reach above-mentioned purpose, the exceeded administering method of thermal power generation unit condensate dissolved oxygen content of the present invention includes
The air leak detection of vacuum system and improvement, thermal power generation unit hollow cold unit condensate undercooling in thermal power generation unit
Condensate pump discrepancy air gate adjustment and fire in adjustment improvement, the water charging system transformation of thermal power generation unit, thermal power generation unit
Axle envelope heater condensate and steam feed pump seal the transformation of water water recovery apparatus in power generator group.
The air leak detection and improvement of vacuum and system comprise the following steps in the vigor generating set：Pass through helium matter
The vacuum system of spectrometer detection thermal power generation unit is leaked with the presence or absence of air, when the vacuum system of thermal power generation unit is deposited
In air leakage, then to the vacuum system progress seal reconstruction of thermal power generation unit.
The adjustment improvement of thermal power generation unit hollow cold unit condensate undercooling comprises the following steps：It is empty using manual regulation
The rotating speed of the hollow air-cooler of cold group, while automatically adjusting turning for air cooling blower fan by the way of degree of supercooling is combined using vacuum values
Speed.
Thermal power generation unit water charging system transformation concrete operations be：The benefit of the water charging system output of thermal power generation unit
Level is respectively enterd after shunting in the moisturizing branch pipe being evenly arranged, and then sprays into condensing through the atomizer on moisturizing branch pipe again
In device；In addition, the air duct of condensate tank deoxygenation head replaced with into air header, and by the extraction negative pressure of the air header
Higher than condensate tank deoxygenation head.
The concrete operations of condensate pump discrepancy air gate adjustment are in thermal power generation unit：1) standby condensate is closed to be pumped into
Mouth evacuates valve；2) open standby condensate pump outlet and evacuate valve, make to go out to leak into air from standby condensate pump floating ring to take out
Enter to the throat of condenser, while standby condensate pump outlet is connected with condenser, the water of standby condensate pump porch
Flow into standby condensate pump, and then make to be full of water in standby condensate pump；3) operation condensate pump port evacuation valve is reduced
Opening degree, reduce air through run condensate pump port evacuation valve to operation condensate pump entrance in leak into.
The transformation process of axle envelope heater condensate and steam feed pump sealing water water recovery apparatus is in thermal power generation unit：Will
Shaft end heater condensate and steam feed pump sealing water backwater are back on the condenser water spraying tray of high-pressure side, pass through high-pressure side condensing
Device water spraying tray realizes the aqueous vapor separation of shaft end heater condensate and steam feed pump sealing water backwater, wherein the air separated
Through vacuum pumped；Simultaneously water level is installed additional on shaft end heater condensate water seal cylinder and steam feed pump sealing water water return water seal cylinder
Meter and emptying valve, when thermal power generation unit work, then Sealing Water for Feedwater Pump water return water seal tin and shaft end heater condensate water
Water is filled in sealed tube, and water pump is sealed into the water level of water water return water seal cylinder and shaft end heater condensate water seal cylinder reclaimed water less than default
During value, water water return water seal cylinder is sealed to water pump and heater condensate water seal cylinder in shaft end carries out moisturizing.
Use vacuum values with the mode that degree of supercooling is combined automatically adjust the concrete operations of the rotating speed of air cooling blower fan for：When solidifying
When the degree of supercooling born water is more than preset value, then it will reduce the rotating speed of air cooling blower fan or close some air cooling blower fans, it is ensured that condensate
Degree of supercooling be less than preset value.
Also include：Two layers of angle steel of square crossing distribution is installed in the top of hot well, wherein, two layers of angle steel is with coagulating
The distance between vapour device bottom is 500mm, and the spacing between two layers of angle steel is in 50mm, same layer angle steel between adjacent angle steel
Spacing is that the angle steel number in 30mm, every layer of angle steel is 20.
The invention has the advantages that：
The exceeded administering method of thermal power generation unit condensate dissolved oxygen content of the present invention enters successively in concrete operations
The air leak detection of vacuum system and improvement, thermal power generation unit hollow cold unit hot-well depression in row thermal power generation unit
Degree adjustment is administered, the transformation of the water charging system of thermal power generation unit, in thermal power generation unit condensate pump come in and go out air gate adjustment and
Axle envelope heater condensate and steam feed pump seal the transformation of water water recovery apparatus in thermal power generation unit, and firepower is sent out so as to realize
The exceeded improvement of group of motors condensate dissolved oxygen content, it is simple to operate, it is comprehensive preferable.
Brief description of the drawings
Fig. 1 is the flow chart of condensate；
Fig. 2 is thermal power generation unit Water, steam circulation flow chart；
Fig. 3 is moisturizing design drawing of the invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Condensate refers to the steam of boiler generation after steam turbine is attacked, the water condensed through circulating cooling water cooling, and real
The condensate of condenser hotwell is also hydrophobic including high-pressure heater, low-pressure heater etc. on border, because therrmodynamic system has steam
Loss, need to supplement a certain amount of make-up water to therrmodynamic system, therefore condensate mainly includes coagulating after steam acting in steam turbine
Bear water, various water deliverys and boiler feedwater.
The flow of condensate as shown in figure 1, condensate system refer to by condenser to pipeline related between oxygen-eliminating device with
Equipment, its main function is heat-setting water, and by condensate from condenser hot well delivers to oxygen-eliminating device, for postcritical
Unit, the quality requirements of boiler feedwater are higher, therefore condensate system needs to carry out just salt purification.In addition, condensate system pair
Condenser water level of thermal well and deaerator level will also carry out necessary regulation, to ensure the safe operation of whole system.
In thermal power plant, water enters boiler and absorbed after heat, is changed into the steam with certain pressure and temperature, so
After be re-fed into expansion work in steam turbine, finish work(steam be discharged into condenser be cooled water cooling be changed into condensate；Condense
Water is sent to condensate through carrying out deep purifying in processing system by condensate pump again, is then re-fed into low-pressure heater, and
Oxygen-eliminating device is delivered to after being heated in low-temperature heater, the water after deoxygenation is pumped into high-pressure heater through feedwater and heated, then through saving
Coal device enters boiler.Although Water, steam circulation is carried out under air-proof condition, because boiler water quality is unqualified and water-steam system leakage
Steam can be caused to lose etc. reason, therefore all；In order to which the normal water and vapour cycle of safeguarding therrmodynamic system are run, it is necessary to use make-up water
These losses are supplemented, make-up water needs purified processing to fill into oxygen-eliminating device, thermal power generation again after objectionable impurities in water is removed
Unit Water, steam circulation flow chart is as shown in Figure 2.
For subcritical and supercritical unit condensate system, their system composition includes two 100% capacity and stood
Formula condensate pump, precision processing device of condensation water, gland heater, three to four low-pressure heaters, a condensate supplements
Water tank and two condensate make-up pumps, while pacifying when being run for guarantee system in startup, shutdown, underload and equipment fault
Complete reliable, system also includes the valve and valve group of many, the feed-water quality standard such as institute of table 1 of overcritical thermal power generation unit
Show, as shown in table 2, the water quality after condensate desalination is as shown in table 3 for Ion exchange resin equipment effluent quality：
Table 1
Table 2
| Detection project | Unit | Start | Normally |
| Hardness | μmol/L | ≤5 | 0 |
| Fe | μg/L | ≤100 | ≤8 |
| Cu | μg/L | ≤30 | ≤3 |
| SiO | μg/L | ≤15 | |
| Na+ | μg/L | ≤5 | |
| Electrical conductivity (25 DEG C) | μs/L | ≤02 |
Table 3
The higher reason of condensate dissolved oxygen has following several respects
1a) power plant units condensate dissolved oxygen content is to characterize one of important indicator of condensate water quality, refined condensate treatment
Severe overweight is long-term unqualified, can accelerate the oxide etch of condensate system, will certainly accelerate unit condensate system
The corrosion of pipeline and each low-pressure heater steel pipe, shortens the service life of equipment, corrosion product, which enters boiler, to influence unit
Safe and economical operation.When unit is normally run, condenser under normal vacuum state, condensate dissolved oxygen be it is qualified, by
In very a variety of causes, domestic unit generally existing condensate dissolved oxygen is exceeded and long-term underproof problem.According to thermal power generation
The pertinent regulations of factory's water steam chemical supervision directive/guide, supervoltage generator group, refined condensate treatment amount answers≤40 μ g/L, subcritical generating
Unit, the μ g/L of condensate dissolved oxygen content≤30.
To solve water resources problems in thermal power plant construction, China has introduced air cooling technique, current Air-cooled Unit it is solidifying
Dissolved oxygen amount excessive problem generally existing is born water, whether Air-cooled Unit or water chiller, the reason for condensate dissolved oxygen is higher
Have a lot, present invention analysis causes reason mainly as follows：
2a) outside air is leak into, and outside air is leak into after condenser, increases the partial pressure of air molecule, can also increase
Plus solubility of the air in water, make dissolved oxygen content increase in condensate, condensate dissolved oxygen content is with the increase of the air amount of leaking into
Increase, dissolved oxygen is exceeded to make the equipment such as low pressure feed water system and boiler heating surface produce substantial amounts of corrosion.
The reason for air enters including unit operation during supplement the oxygen brought into of demineralized water, oxygen in water amount is depended on
Temperature and local atmospheric pressure, compared with condensate, supplement oxygen in water amount contains more than nearly thousand times, therefore to condensate dissolved oxygen
The influence of amount is very big；Entrainment with steam oxygen, and quantity very little；The oxygen that the air that vacuum system equipment leak source enters is brought into
It is the main source of condensate dissolved oxygen；Condensate pump sealed packing, joint of pipeline etc. are leaked；Unit load is low, steam stream
Amount is small, and the region worked under vacuum state expands, and leaked-in air amount can greatly increase；What various drain recoveries were brought into
Oxygen, for example, raw water heater is hydrophobic, recycling water tank of condensation water is hydrophobic, dissolving oxygen is relatively fewer, and dredging for contact air
Water be influenced by temperature it is larger, temperature it is low it is hydrophobic its dissolving oxygen it is more, temperature height dissolving oxygen it is less, during unit operation
It should try one's best and reduce the entrance of air, and discharge incondensable gas, therefore the direct shadow of height of the vacuum efficiency of pump in time
The dissolved oxygen amount of condensate is rung, in the case where incondensable gas total amount is certain, the gas flow of extraction is more, is redissolved in condensate
In oxygen amount it is few, vice versa.
3a) condense supercooling the reason for, specifically, condensate undercooling characterize be condensate in Condenser's Hot Well mistake
Cooling degree, condensate hot well outlet condensing water temperature and the condenser difference of corresponding saturation temperature under exhaust steam pressure is referred to as
Degree of supercooling, current clammy generating set requires that condenser its degree of supercooling is no more than 0.5~1 DEG C.
Because the steam discharge of air cooling turbo-generator needs to be cooled down with air, Air-cooled Unit is because heat transfer area is larger, flow process
Grow, drag losses is big, simultaneously because the reason such as radiating of discharge duct and decline pipeline can produce serious supercooling.Steam discharge is by air cooling
Enter at the top of island heat-sink unit, steam carries out heat exchange by spreader surface and air, most of steam condensation Cheng Shui, and with
Non-condensing some vapor enters condensate water collecting that Air-Cooling Island bottom formed to main pipe together, and condensate is female by collecting
Pipe, confluxes into condensate water collecting case；A small amount of steam and incondensable gas are entered by Air-Cooling Island counter flow cell bottom, are then entered again
The further cooling of row, incondensable gas is finally extracted out drained into by vavuum pump in air；Because steam is flowed to from blow-off line
Down-comer is flowed to after heat-sink unit, resistance can be produced during flowing, causes lower steam pressure to be less than upper pressure, and bottom condenses
Coolant-temperature gage is low compared with top, so as to produce supercooling.Degree of supercooling increase, condensate dissolved oxygen content is consequently increased, therefore degree of supercooling is not
Low pressure feed water system equipment is only set to produce corrosion phenomenon, and the size of the influence condensate air amount of leaking into, so as to have impact on
The economy and security of unit.
The problem of 4a) water charging system is present, specifically, the normal moisturizing of generation current unit is the desalination without deoxygenation
Water, rate of water make-up is bigger, brings oxygen amount inside condensate into more.Demineralized water in sweet-water tank is directly entered solidifying by desalination water pump
Bear water case or the deoxygenation head on condensate tank top.Because sweet-water tank is placed on outdoor, desalination coolant-temperature gage is substantially environment temperature
Degree, less than the condensing water temperature in condensate tank, substantial amounts of low temperature demineralized water is direct in the case of any heating of no process
Condensate tank is filled into, both the above mode can not make the demineralized water filled into reach the saturation temperature under corresponding exhaust back pressure, its
In, the large quantity of air of dissolving can not be separated out, so as to cause Excessive Dissolved Oxygen in Condensate；Simultaneously because mounting design condensate filling pipe
Shower nozzle atomizing effect it is bad, the hole count on the shower nozzle of filling pipe is less, hole amount it is thicker so that generating set moisturizing can not be equal
Even sprinkling also can increase condensate dissolved oxygen into tiny water droplet.
5a) the float ring seal effect of condensate pump is bad, condensate pump float ring seal by multistage radial floating ring and
Support ring is constituted, and to improve sealing effectiveness, high pressure sealing water is passed through in the centre of multistage ring, on the axle sleeve of floating ring set, this
There is small radial clearance between the two, the high pressure sealing water being passed through reaches axle by this small gap reducing pressure by regulating flow
To sealing, the radial clearance between floating ring and support ring is also to be acted on by high pressure sealing water on the other end of floating ring,
To reach radial seal.And the radial seal effect of floating ring is decided by the floating ring precision of the contact with support ring end face,
Condensate pump porch leaked-in air is evacuated to the larynx of condenser by condensate pump entrance provided with valve is evacuated through evacuating valve
Portion, is taken away by vavuum pump, to reduce condensate pump porch leaked-in air；The float ring seal of condensate pump is due to installing matter
Amount is bad, and the finishing stage of floating ring and support ring end face is bad so that the floating ring tightness of the contact with support ring end face
Poor, air is leak into standby condensate pump at the contact surface of standby condensate pump floating ring and support ring end face, then from standby
With the entrance that operation pump is leak at the port evacuation valve of pump, because negative pressure is more than condenser negative pressure at operation pump intake, leak into
Air just flowed into condensate in operation pump, air is dissolved in condensate after operation pump is boosted so that condense water-soluble
Solve oxygen increase.
6a) the hydrophobic recovery of therrmodynamic system, being discharged into the fluid of condenser substantially has to sow：Condenser water replenishing, steam-operating are given
Water pump sealing water backwater, normal hydrophobic, the flash vessel centralized drainage of low-pressure heater and axle envelope pressurizer are hydrophobic, these hydrophobic entrance
Condenser, can cause condensate dissolved oxygen content to surpass because design is discharged into the reasons such as the position selection improper, variable working condition of improper, parameter
Mark.
Feed pump uses mechanical seal, and sealing water is supplied water using condensate, and one grade of drain charge water returns to preposition feed pump and is pumped into
Mouthful, two grades of sealing water backwater are discharged to trench before condenser sets up vacuum, and multi-level water is passed through after condenser sets up vacuum
Low-pressure side condenser is returned to after sealed tube；Because steam feed pump sealing water return water seal cylinder does not install water-level gauge in the design, only
Water filling door, be not vented valve, put into operation sealing water before, need to water seal cylinder carry out water filling, but water seal cylinder whether fill water without
Method is judged whether operation reclaimed water sealed tube water level normally can not also be monitored, if sealing drum water level is low will to lose water
The effect of envelope, and damage of water block causes feed pump low pressure seal return water system negative pressure leakage, thus the hollow gas of condenser is caused, make
It is exceeded into condensate dissolved oxygen content.The normal hydrophobic gravity flow step by step of steam turbine low-pressure heater enters condenser, if low-pressure heating
Device it is normal hydrophobic to condenser pipeline imprecision, air can be made in company with hydrophobic entrance condenser, cause condenser vacuum tight
Property decline simultaneously condensate dissolved oxygen content it is exceeded the problem of；Turbine shaft seal heater condensate enters condensing by multi-level water sealed tube
Device, if gland heater water level is too low, can be such that a part of axle envelope back-steam is directly entered in Condenser's Hot Well, wherein, it is molten
The oxygen of solution, which is condensed water pump and taken away, enters condensate system, so as to cause condensate dissolved oxygen content exceeded.
To solve the above problems, the exceeded administering method of thermal power generation unit condensate dissolved oxygen content of the present invention includes
The air leak detection of vacuum system and improvement, thermal power generation unit hollow cold unit condensate undercooling in thermal power generation unit
Condensate pump discrepancy air gate adjustment and fire in adjustment improvement, the water charging system transformation of thermal power generation unit, thermal power generation unit
Axle envelope heater condensate and steam feed pump seal the transformation of water water recovery apparatus in power generator group.
The air leak detection and improvement of vacuum and system comprise the following steps in the vigor generating set：Pass through helium matter
The vacuum system of spectrometer detection thermal power generation unit is leaked with the presence or absence of air, when the vacuum system of thermal power generation unit is deposited
In air leakage, then to the vacuum system progress seal reconstruction of thermal power generation unit；Because vacuum system equipment is very huge, even
Adapter road is intricate, once having, leakage searching work amount is especially big, and the present invention is using applying right and the one kind largely implemented
Thermal power generation unit vacuum system leakage detection method (patent No. 201410453111.8), is leaked generating set vacuum system
Detected, to accomplish 100% inspection, to ensure the tightness of whole vacuum system, air is entered solidifying by the system leak
The oxygen amount born water is eliminated.
The adjustment improvement of thermal power generation unit hollow cold unit condensate undercooling comprises the following steps：It is empty using manual regulation
The rotating speed of the hollow air-cooler of cold group, while automatically adjusting turning for air cooling blower fan by the way of degree of supercooling is combined using vacuum values
Speed；Wherein, use vacuum values with the mode that degree of supercooling is combined automatically adjust the concrete operations of the rotating speed of air cooling blower fan for：When solidifying
When the degree of supercooling born water is more than preset value, then it will reduce the rotating speed of air cooling blower fan or close some air cooling blower fans, it is ensured that condensate
Degree of supercooling be less than preset value.For example：When degree of supercooling is more than 1 degree during unit operation in the winter time, the Air-Cooling Island fortune of adjustment reduction in time
Row rotation speed of fan is to low speed, or each cooling unit interval stops 2-3 platforms operation blower fan, to control exhaust casing saturation in time
Difference between the corresponding saturation temperature value of pressure and condensation water temperature, so as to ensure the degree of supercooling of air cooling tubes condenser condensate 1
Within DEG C, meanwhile, when air cooling tubes condenser is run in the winter time, strengthen the lower collecting box or Air-Cooling Island heat-sink unit of Air-Cooling Island condensate
Anti-cold lagging facility is covered on two units of outermost, is not more than 1 degree the purpose is to the degree of supercooling for making condensate, prevents from condensing water-soluble
Oxygen causes exceeded due to the reason.
Thermal power generation unit water charging system transformation concrete operations be：The benefit of the water charging system output of thermal power generation unit
Level is respectively enterd after shunting in the moisturizing branch pipe being evenly arranged, and then sprays into condensing through the atomizer on moisturizing branch pipe again
In device；In addition, the air duct of condensate tank deoxygenation head replaced with into air header, and by the extraction negative pressure of the air header
Higher than condensate tank deoxygenation head.
The concrete operations of condensate pump discrepancy air gate adjustment are in thermal power generation unit：1) standby condensate is closed to be pumped into
Mouth evacuates valve；So just can not be at the port evacuation valve of standby condensate pump from leaked-in air at stand-by pump floating ring
The entrance of operation pump is leak into, greatly reduces the air capacity of operation condensate pump porch, reduces oxygen in operation condensate pump
The probability of middle dissolving.2) open standby condensate pump outlet and evacuate valve, make to go out to leak into air from standby condensate pump floating ring
It is pumped into the throat of condenser, while standby condensate pump outlet is connected with condenser, standby condensate pump porch
Water is flowed into standby condensate pump, and then makes to be full of water in standby condensate pump；3) operation condensate pump port evacuation gas is reduced
The opening degree of door, reduces air through being leak at operation condensate pump port evacuation valve into operation condensate pump entrance, so that
Reduce from leaked-in air amount at standby condensate pump floating ring.
The transformation process of axle envelope heater condensate and steam feed pump sealing water water recovery apparatus is in thermal power generation unit：Will
Shaft end heater condensate and steam feed pump sealing water backwater are back on the condenser water spraying tray of high-pressure side, pass through high-pressure side condensing
Device water spraying tray realizes the aqueous vapor separation of shaft end heater condensate and steam feed pump sealing water backwater, wherein the air separated
Through vacuum pumped；Simultaneously water level is installed additional on shaft end heater condensate water seal cylinder and steam feed pump sealing water water return water seal cylinder
Meter and emptying valve, when thermal power generation unit work, then Sealing Water for Feedwater Pump water return water seal tin and shaft end heater condensate water
Water is filled in sealed tube, and water pump is sealed into the water level of water water return water seal cylinder and shaft end heater condensate water seal cylinder reclaimed water less than default
During value, water water return water seal cylinder is sealed to water pump and heater condensate water seal cylinder in shaft end carries out moisturizing, it is to avoid water seal is destroyed, and empty
Gas, which enters condenser, influences Tightness Property of Condenser Vacuum System, in turn results in condensate dissolved oxygen content exceeded.
Present invention additionally comprises：Two layers of angle steel of square crossing distribution is installed in the top of hot well, wherein, described two layers jiao
The distance between steel and condenser bottom are that the spacing between 500mm, two layers of angle steel is adjacent angle steel in 50mm, same layer angle steel
Between spacing be 30mm, the angle steel number in every layer of angle steel is 20, splashes on angle steel, is formed tiny so that condensing water attack
Current, it is fully dispersed, increase the surface area of current, the deaerating effect of condenser is improved, so as to reduce the dissolved oxygen of condensate.
Furthermore it is also possible to be transformed as follows：1b) condensate pump is run under negative pressure state, and it uses packing
The mode of encryption water shutoff is sealed, the press water that sealing water is exported from condensate pump., may when condensate pump is in stand-by state
Cause water-stop not strict, air, which is leak into condensate pump, causes the oxygen content of condensate to increase, Excessive Dissolved Oxygen in Condensate, together
When, condensate pump inlet valve filler chamber uses general filler packing_seal, when not changed in time when valve packing aging,
Air leaks into system, causes Excessive Dissolved Oxygen in Condensate, and for above mentioned problem, the present invention is using helium mass spectrometer detector to condensate pump
Inlet duct and its sealing of condensate pump body are detected, when helium mass spectrometer detector has data reflection, if helium mass spectrum is examined
Survey instrument show value and be more than 1.0E-06 numerical value, to the part of appliance detected, carry out sealing replacing.
In addition, being discharged into the additional of condenser hydrophobic substantially has following several:Moisturizing, condensate recycling water, Gao Jia,
It is hydrophobic in the low hydrophobic and flash vessel added.These are hydrophobic to be discharged into condenser, selects improper, parameter improper due to being discharged into position,
Excessive Dissolved Oxygen in Condensate can be caused.Particularly demineralized water, is only chemically treated, and is not carried out deep deoxygenization, is worked as rate of water make-up
Increase and during spray equipment imperfection, then be easier to cause Excessive Dissolved Oxygen in Condensate, because thermal power generation unit is all hydrophobic
And its moisturizing pipeline is relatively low into condenser (exhaust casing) design connecting portion, causes the hydrophobic entrance condenser (steam discharge in the part
Cylinder) it is internal, it is improper due to being discharged into Position Design, cause in exhaust casing that secondary deaerating effect is bad, finally make refined condensate treatment
Exceeded, for above mentioned problem, all hydrophobic connectors of existing generating set are moved up 1-2m by the present invention, and are being discharged into cylinder
The mouth of pipe installs nozzle additional, the hydrophobic change entered in cylinder is nebulized, so that the partial coagulation water enters the secondary deaerating effect of cylinder interior.
Strengthen the adjustment of parameter in 2b) running, particularly packing pressure must be adjusted in the range of code defined；It is right
In the adjustment for condensing pump shaft seal, the packing of application claims condensate pump must have a certain amount of water to flow out in operation, can
To ensure that between condensation pump pump shaft air will not be leak into.If pump shaft is watertight in operation, air certainly will be caused to leak into pump,
Making the dissolved oxygen of condensate increases, therefore, and the packing of condensate pump should control to be advisable in slight leak out.
3b) thermal power generation unit exhaust casing moisturizing design is improper, causes secondary deaerating effect difference to cause refined condensate treatment to surpass
Mark, directly influences the economy and security of generating set, existing a large amount of Direct Air-cooled Units are in the northern area of China in addition
Put into operation, the research saved water and energy seems particularly important, from the point of view of current state time generator group running situation, most of machine
The scope of the dissolved oxygen of group condensate generally more than 100 μ g/L, pertinent regulations, super-pressure unit condensate are supervised more than power technology
Dissolved oxygen amount is less than or equal to 40 μ g/L, and the subcritical generating set refined condensate treatment amount person of should be less than is equal to 30 μ g/L, through undue
Analysis research, the subject matter for causing this reason is that generating set exhaust casing throat design water charging system is unreasonable, causes to condense
Water moisturizing oxygen content directly fills into and Excessive Dissolved Oxygen in Condensate is caused in condenser close to saturation.
High vacuum is in when condensing equipment is run, excessive air, which leaks into, can cause generating set vacuum to drop
Low, the aggregate amount of air, aggravates the burden of pumped vacuum systems, prevents the noncondensing gas of condenser from taking out in time in increase condenser
Go out, further increase the aggregate amount of air in condenser, the exothermic coefficient of steam is greatly lowered, so as to reduce condenser
Heat exchange efficiency, improves the operating pressure of condenser, reduces the thermal efficiency of unit, the electricity consumption of increase power plant.
Generating set throat moisturizing design method, by chemical filling pipe position at 9 meters, 8 meters and 7 meter three of throat's absolute altitude,
This position possesses three conditions of thermal de-aeration：A) saturation temperature that must be heated the water under operating pressure, b) both carbonated drink
Between must have sufficient contact area, the oxygen of precipitation must c) be discharged in time；Chemical moisturizing is after atomizer is atomized
Exhaust steam can be made full use of to carry out deoxygenation, vapour source is sufficient, aloft drop is big for moisturizing position, when carbonated drink has sufficiently contact heating
Between, ensure that and be heated to saturation temperature, while longer apart from vacuum pumping opening flow, the gas of precipitation can easily by
Vavuum pump is from pump-line is discharged to air.The present invention design be：First group in 9 meters of layer position exhaust casings of throat's absolute altitude
Surrounding is respectively arranged 120 (30 3.0L/min are arranged per one side) atomizers, and second group in 8 meters of layers of exhaust casing throat absolute altitude
Position surrounding is respectively arranged 160 (40 3.0L/min are arranged per one side) atomizers, meets generating set and normally runs benefit
Water, the 3rd group is arranged 160 (40 5.0L/min are arranged per one side) atomizers in 7 meters of layer position surroundings of exhaust casing absolute altitude,
3rd group, as the standby moisturizing of generating set, uses when rate of water make-up in the case of unit heat supply increases；Moisturizing nozzle is selected to be small
Flow hollow cone fan nozzle, the material selection 1Cr18Ni9Ti of nozzle, by being closed between the adjacent spraying to multiinjector collector
The superposition sequence of reason, forms on whole spraying section and sprays uniform effect, heat and mass fully, and is conducive to the analysis of gas
Go out；Design parameter of the present invention is：Moisturizing operating pressure：0.5-1.0MPa, moisturizing temperature：30 DEG C, rate of water make-up：30-150t/h.
Claims (7)
1. a kind of exceeded administering method of thermal power generation unit condensate dissolved oxygen content, it is characterised in that including thermal power generation unit
The air leak detection of middle vacuum system and improvement, the adjustment of thermal power generation unit hollow cold unit condensate undercooling are administered, fire
The water charging system transformation of power generator group, condensate pump comes in and goes out in air gate adjustment and thermal power generation unit in thermal power generation unit
Gland heater is hydrophobic and steam feed pump seals the transformation of water water recovery apparatus.
2. the exceeded administering method of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that institute
The air leak detection and improvement for stating vacuum and system in vigor generating set comprise the following steps：Examined by helium mass spectrometer detector
The vacuum system for surveying thermal power generation unit is leaked with the presence or absence of air, is let out when the vacuum system of thermal power generation unit has air
Leakage, then to the vacuum system progress seal reconstruction of thermal power generation unit.
3. the exceeded administering method of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that fire
The adjustment improvement of power generator group hollow cold unit condensate undercooling comprises the following steps：It is hollow using manual regulation Air-cooled Unit
The rotating speed of air-cooler, while automatically adjusting the rotating speed of air cooling blower fan by the way of degree of supercooling is combined using vacuum values.
4. the exceeded administering method of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that fire
Power generator group water charging system transformation concrete operations be：The moisturizing of the water charging system output of thermal power generation unit is averagely shunted
Respectively enter in the moisturizing branch pipe being evenly arranged, then sprayed into again through the atomizer on moisturizing branch pipe in condenser afterwards；In addition,
The air duct of condensate tank deoxygenation head is replaced with into air header, and the extraction negative pressure of the air header is higher than condensate
Case deoxygenation head.
5. the exceeded administering method of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that fire
The concrete operations of condensate pump discrepancy air gate adjustment are in power generator group：1) standby condensate pump port evacuation gas is closed
Door；2) open the outlet of standby condensate pump and evacuate valve, make to go out to leak into air from standby condensate pump floating ring and be pumped into condensing
The throat of device, while making standby condensate pump outlet be connected with condenser, the water inflow of standby condensate pump porch is standby
In condensate pump, and then make to be full of water in standby condensate pump；3) opening degree of operation condensate pump port evacuation valve is reduced,
Reduce air and leak into through running condensate pump port evacuation valve into operation condensate pump entrance.
6. the exceeded administering method of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that fire
The transformation process of axle envelope heater condensate and steam feed pump sealing water water recovery apparatus is in power generator group：By shaft end heater
Hydrophobic and steam feed pump sealing water backwater is back on the condenser water spraying tray of high-pressure side, real by high-pressure side condenser water spraying tray
The aqueous vapor separation of existing shaft end heater condensate and steam feed pump sealing water backwater, wherein the air separated is through vacuum pumping
Go out；Water-level gauge is installed additional on shaft end heater condensate water seal cylinder and steam feed pump sealing water water return water seal cylinder and drop a hint simultaneously
Door, when thermal power generation unit works, is then filled in Sealing Water for Feedwater Pump water return water seal cylinder and shaft end heater condensate water seal cylinder
Water, and when water pump is sealed into the water level of water water return water seal cylinder and shaft end heater condensate water seal cylinder reclaimed water less than preset value, then it is right
Water pump sealing water water return water seal cylinder and shaft end heater condensate water seal cylinder carry out moisturizing.
7. the exceeded administering method of thermal power generation unit condensate dissolved oxygen content according to claim 3, it is characterised in that adopt
It is with vacuum values with the concrete operations that the mode that degree of supercooling is combined automatically adjusts the rotating speed of air cooling blower fan：When the supercooling of condensate
When degree is more than preset value, then it will reduce the rotating speed of air cooling blower fan or close some air cooling blower fans, it is ensured that the degree of supercooling of condensate is small
In preset value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109813138A (en) * | 2019-03-07 | 2019-05-28 | 大唐东营发电有限公司 | A kind of boiler condenser two-stage vacuum pump control system |
| CN115842399A (en) * | 2023-02-21 | 2023-03-24 | 成都睿宝电子科技有限公司 | Power supply device and control method of helium mass spectrometer leak detector |
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| CN204225935U (en) * | 2014-10-28 | 2015-03-25 | 西安亨特电力科技有限公司 | The energy-conservation water replenishing device of a kind of thermal power generation unit exhaust casing |
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Application publication date: 20171017 |