CN206890501U - A kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content - Google Patents
A kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content Download PDFInfo
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Abstract
A kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content, including boiler, the multigroup tandem turbine being arranged on boiler, the condenser being connected respectively by vacuum pipe system with multigroup tandem turbine, the condenser connects condensate pump by vacuum pipe system, the condensate pump is connected to condensate polishing system by vacuum pipe system, the condensate polishing system connects multiple series connection low-pressure heaters by vacuum pipe system, multiple tandem high pressure heaters are connected respectively with boiler and multigroup tandem turbine respectively by vacuum pipe system；Air-cooled Unit is respectively arranged with multigroup tandem turbine, adjustment module is provided with the Air-cooled Unit, the adjustment module is used for the rotating speed that air cooling blower fan is automatically adjusted by vacuum values and degree of supercooling.
Description
Technical field
The utility model belongs to thermoelectric generator technical group field, is related to a kind of thermal power generation unit condensate dissolved oxygen content
Exceeded governing system.
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.
Excessive endangered to caused by 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
When solving oxygen severe overweight, feedwater dissolved oxygen is exceeded after also resulting in oxygen-eliminating device, influences boiler heating surface heat transfer efficiency, accelerates boiler
The accident such as pipe-line equipment corrosion and scaling or even generation boiler tube bursting, the safety of serious threat unit, economical operation；2) in steam turbine
Heat regenerative system in, using surface-type heat exchanger, the corrosion product of equipment is attached on heat-transfer surface, forms loose attachment
Layer, while contain hyperoxia in condensate, it can make to form thin film on heat-transfer surface, increase heat exchanged thermoresistance, reduce 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, the output of unit will be reduced when serious；It is another
Aspect, also cause the pumping load increase of extract system, add station-service electricity.
Utility model content
In view of this, the utility model provides a kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content.
The technical scheme that it is used is as follows：
A kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content, including boiler, are arranged on more on boiler
Group tandem turbine, the condenser being connected respectively by vacuum pipe system with multigroup tandem turbine, the condenser
Condensate pump is connected by vacuum pipe system, the condensate pump is connected to condensate polishing system by vacuum pipe system,
Make up water treatment system is additionally provided with condenser, the condensate polishing system connects multiple strings by vacuum pipe system
Join low-pressure heater, multiple series connection low-pressure heaters are connected with oxygen-eliminating device by vacuum pipe system respectively, and oxygen-eliminating device passes through true
Vacant duct system is connected to multiple tandem high pressure heaters through small pump, and multiple tandem high pressure heaters pass through vacuum pipe system
It is connected respectively with boiler and multigroup tandem turbine respectively；
Air-cooled Unit is respectively arranged with multigroup tandem turbine, regulation mould is provided with the Air-cooled Unit
Block, the adjustment module are used for the rotating speed that air cooling blower fan is automatically adjusted by vacuum values and degree of supercooling；When the degree of supercooling of condensate
During more than preset value, then the rotating speed or some air cooling blower fans of closing of air cooling blower fan will be reduced, ensures that the degree of supercooling of condensate is less than
Preset value；
One helium mass spectrometer detector, is arranged at vacuum pipe system, for detecting the vacuum pipe system of thermal power generation unit
System leaks with the presence or absence of air；When helium mass spectrometer detector show value is more than 1.0E-06 numerical value, dynamic regulation is carried out；
The moisturizing of the make up water treatment system output is respectively enterd in the moisturizing branch pipe being evenly arranged after averagely shunting, so
Sprayed into again through the atomizer on moisturizing branch pipe in condenser afterwards；And the extraction negative pressure of the air header is higher than condensate tank
Deoxygenation head.
Preferably, be provided with float ring seal at the condensate pump, the float ring seal by multistage radial floating ring and
Support ring is formed, and high pressure sealing water is passed through in the centre of multistage radial floating ring, and is existed between axle sleeve between small radial direction
Gap, the high pressure sealing water being passed through reach axial seal, multistage radial floating ring and branch by this small gap reducing pressure by regulating flow
Radial clearance between carrier ring, acted on by high pressure sealing water on the other end of multistage radial floating ring, to reach radially close
Envelope, complete dynamic regulation.
Preferably, the make up water treatment system also includes chemical moisturizing guard system, and the chemical moisturizing guard system is arranged on
The throat of multigroup tandem turbine, it is respectively：First group is respectively arranged 120 in 9 meters of layer position exhaust casing surroundings of throat's absolute altitude
Individual (30 3.0L/min are arranged per one side) atomizer, second group in 8 meters of layer position surrounding difference cloth of exhaust casing throat absolute altitude
160 (40 3.0L/min are arranged per one side) atomizers are put, meet generating set normal operation moisturizing, the 3rd group is being vented
7 meters of layer position surroundings of cylinder absolute altitude arrange 160 (40 5.0L/min are arranged per one side) atomizers, and the 3rd group as multigroup string
The standby moisturizing of connection formula steam turbine, used when rate of water make-up in the case of multigroup tandem turbine heat supply increases；Moisturizing nozzle is selected
For low discharge hollow cone fan nozzle, the material selection 1Cr18Ni9Ti of nozzle, by the adjacent spraying to multiinjector collector it
Between rational superposition sequence, it is uniform to form injection on whole spraying section.
Preferably, the make up water treatment system working pressure：0.5-1.0MPa, moisturizing temperature：30 DEG C, rate of water make-up：30‐
150t/h。
The exceeded administering method of thermal power generation unit condensate dissolved oxygen content described in the utility model in concrete operations, according to
The air leak detection of vacuum system and improvement, thermal power generation unit hollow cold unit condensate in secondary carry out thermal power generation unit
Degree of supercooling adjustment is administered, the water charging system of thermal power generation unit is transformed, condensate pump discrepancy air gate is adjusted in thermal power generation unit
The regulation of axle envelope heater condensate and steam feed pump sealing water water recovery apparatus in whole and thermal power generation unit, so as to realize to fire
The exceeded improvement of power generator group 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 present utility model.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings：
A kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content, including boiler, are arranged on more on boiler
Group tandem turbine, the condenser being connected respectively by vacuum pipe system with multigroup tandem turbine, the condenser
Condensate pump is connected by vacuum pipe system, the condensate pump is connected to condensate polishing system by vacuum pipe system,
Make up water treatment system is additionally provided with condenser, the condensate polishing system connects multiple strings by vacuum pipe system
Join low-pressure heater, multiple series connection low-pressure heaters are connected with oxygen-eliminating device by vacuum pipe system respectively, and oxygen-eliminating device passes through true
Vacant duct system is connected to multiple tandem high pressure heaters through small pump, and multiple tandem high pressure heaters pass through vacuum pipe system
It is connected respectively with boiler and multigroup tandem turbine respectively；
Air-cooled Unit is respectively arranged with multigroup tandem turbine, regulation mould is provided with the Air-cooled Unit
Block, the adjustment module are used for the rotating speed that air cooling blower fan is automatically adjusted by vacuum values and degree of supercooling；When the degree of supercooling of condensate
During more than preset value, then the rotating speed or some air cooling blower fans of closing of air cooling blower fan will be reduced, ensures that the degree of supercooling of condensate is less than
Preset value；
One helium mass spectrometer detector, is arranged at vacuum pipe system, for detecting the vacuum pipe system of thermal power generation unit
System leaks with the presence or absence of air；When helium mass spectrometer detector show value is more than 1.0E-06 numerical value, dynamic regulation is carried out；
The moisturizing of the make up water treatment system output is respectively enterd in the moisturizing branch pipe being evenly arranged after averagely shunting, so
Sprayed into again through the atomizer on moisturizing branch pipe in condenser afterwards；And the extraction negative pressure of the air header is higher than condensate tank
Deoxygenation head.
Preferably, be provided with float ring seal at the condensate pump, the float ring seal by multistage radial floating ring and
Support ring is formed, and high pressure sealing water is passed through in the centre of multistage radial floating ring, and is existed between axle sleeve between small radial direction
Gap, the high pressure sealing water being passed through reach axial seal, multistage radial floating ring and branch by this small gap reducing pressure by regulating flow
Radial clearance between carrier ring, acted on by high pressure sealing water on the other end of multistage radial floating ring, to reach radially close
Envelope, complete dynamic regulation.
Preferably, the make up water treatment system also includes chemical moisturizing guard system, and the chemical moisturizing guard system is arranged on
The throat of multigroup tandem turbine, it is respectively：First group is respectively arranged 120 in 9 meters of layer position exhaust casing surroundings of throat's absolute altitude
Individual (30 3.0L/min are arranged per one side) atomizer, second group in 8 meters of layer position surrounding difference cloth of exhaust casing throat absolute altitude
160 (40 3.0L/min are arranged per one side) atomizers are put, meet generating set normal operation moisturizing, the 3rd group is being vented
7 meters of layer position surroundings of cylinder absolute altitude arrange 160 (40 5.0L/min are arranged per one side) atomizers, and the 3rd group as multigroup string
The standby moisturizing of connection formula steam turbine, used when rate of water make-up in the case of multigroup tandem turbine heat supply increases；Moisturizing nozzle is selected
For low discharge hollow cone fan nozzle, the material selection 1Cr18Ni9Ti of nozzle, by the adjacent spraying to multiinjector collector it
Between rational superposition sequence, it is uniform to form injection on whole spraying section.
Preferably, the make up water treatment system working pressure：0.5-1.0MPa, moisturizing temperature：30 DEG C, rate of water make-up：30‐
150t/h。
Condensate refers to that steam is after steam turbine is attacked caused by boiler, 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, a certain amount of make-up water need to be supplemented 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 condensate is delivered in oxygen-eliminating device from condenser hot well, 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, after water enters boiler absorption heat, it 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
Etc. reason, therefore can all steam be caused to lose；In order to safeguard the normal water of therrmodynamic system and vapour cycle operation, 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, a gland heater, three to four low-pressure heaters, a condensate supplement
Water tank and two condensate make-up pumps, while be that guarantee system is pacified when being run in startup, shutdown, underload and equipment fault
Complete reliable, system also includes many valves and valve group, the feed-water quality standard such as institute of table 1 of overcritical thermal power generation unit
Show, Ion exchange resin equipment effluent quality is as shown in table 2, and the water quality after condensate desalination is as shown in table 3：
Table 1
Table 2
| Detection project | Unit | Start | Normally |
| Hardness | μmol/L | ≤5 | 0 |
| Fe | μg/L | ≤100 | ≤8 |
| Cu | μg/L | ≤30 | ≤3 |
| SiO2 | μg/L | _ | ≤15 |
| Na+ | μg/L | _ | ≤5 |
| Electrical conductivity (25 DEG C) | μs/L | _ | ≤0.2 |
Table 3
The higher reason of condensate dissolved oxygen has following several respects
1a) power plant units condensate dissolved oxygen content is one of the important indicator for characterizing 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, shorten the service life of equipment, corrosion product, which enters boiler, to influence unit
Safe and economical operation.During unit normal operation, 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 answer≤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, and Air-cooled Unit is solidifying at present
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, the utility model analysis causes reason mainly as follows：
2a) outside air leaks into, and after outside air leaks into condenser, increases the partial pressure of air molecule, can also increase
Add solubility of the air in water, make in condensate dissolved oxygen content increase, condensate dissolved oxygen content increase with the air amount of leaking into and
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 oxygen that the reason for air enters brings into including supplementing demineralized water during unit operation, oxygen in water amount depend 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；The leakage such as joint of condensate pump sealed packing, pipeline；Unit load is low, steam stream
Small, to be worked under vacuum state region expansion is measured, 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, the oxygen of dissolving is relatively fewer, and dredging for contact air
Water is influenced by temperature larger, and the oxygen of its low hydrophobic dissolving of temperature is more, and the oxygen of the high dissolving of temperature is less, during unit operation
It should try one's best and reduce the entrance of air, and discharge incondensable gas in time, therefore the direct shadow of height of the vacuum efficiency of pump
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 are referred to as
Degree of supercooling, current clammy generating set require 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
Entering 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
It is female by collecting to main pipe, condensate that non-condensing some vapor enters the condensate water collecting that Air-Cooling Island bottom is formed together
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；Due to steam from blow-off line flow to
Flow to down-comer after heat-sink unit, resistance can be produced during flowing, cause 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 produced corrosion phenomenon, and influence the size of the 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, and it is more to bring oxygen amount inside condensate into.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 separate 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 formed, 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
Small radial clearance between the two be present, 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, and 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 contact precision of the floating ring with support ring end face,
Condensate pump entrance, which is provided with, evacuates valve, and condensate pump porch leaked-in air is evacuated to the larynx of condenser through evacuating valve
Portion, 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
Measure bad, the finishing stage of floating ring and support ring end face is bad so that the contact tightness of floating ring and 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, the fluid for being discharged into condenser substantially have 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, select the reasons such as improper, parameter is improper, variable working condition condensate dissolved oxygen content can be caused to surpass because design is discharged into position
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 establishes vacuum, and multi-level water is passed through after condenser establishes 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, is 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 to enter condenser in company with hydrophobic, 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, a part of axle envelope back-steam can be made to be directly entered in Condenser's Hot Well, wherein, it is molten
The oxygen of solution is condensed water pump and taken away into 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 described in the utility model
Air leak detection and improvement including vacuum system in thermal power generation unit, thermal power generation unit hollow cold unit condensate mistake
Cold degree adjustment is administered, the water charging system of thermal power generation unit is transformed, condensate pump discrepancy air gate adjustment in thermal power generation unit
And axle envelope heater condensate and steam feed pump seal the transformation of water water recovery apparatus in thermal power generation unit.
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 leaks with the presence or absence of air, when the vacuum system of thermal power generation unit is deposited
Leaked in air, then seal reconstruction is carried out to the vacuum system 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, what the utility model used applying right and largely implemented
A kind of thermal power generation unit vacuum system leakage detection method (patent No. 201410453111.8), to generating set vacuum system
Leakage is detected, and to accomplish 100% inspection, to ensure the tightness of whole vacuum system, air is entered by the system leak
The oxygen amount for entering condensate eliminates.
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 turning for air cooling blower fan is automatically adjusted by the way of degree of supercooling is combined using vacuum values
Speed；Wherein, the mode for using vacuum values to be combined with degree of supercooling 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 the rotating speed or some air cooling blower fans of closing of air cooling blower fan will be reduced, ensures condensate
Degree of supercooling be less than preset value.Such as：When degree of supercooling is more than 1 degree during unit operation in the winter time, adjustment in time reduces Air-Cooling Island fortune
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 saturation temperature value corresponding to 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, the purpose is to make the degree of supercooling of condensate be not more than 1 degree, prevents from condensing water-soluble
Oxygen is exceeded because the reason causes.
Thermal power generation unit water charging system transformation concrete operations be：The benefit of the water charging system output of thermal power generation unit
Respectively enterd after horizontal shunting in the moisturizing branch pipe being evenly arranged, then spray 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.
In thermal power generation unit condensate pump come in and go out air gate adjustment concrete operations be：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, air is reduced through being leak at operation condensate pump port evacuation valve into operation condensate pump entrance, so as to
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 works, then Sealing Water for Feedwater Pump water return water seal cylinder 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, avoids water seal from being destroyed, and it is empty
Gas, which enters condenser, influences Tightness Property of Condenser Vacuum System, and it is exceeded in turn result in condensate dissolved oxygen content.
The utility model also includes：In two layers of angle steel of the top of hot well installation square crossing distribution, wherein, described two
Layer the distance between angle steel and condenser bottom are 500mm, and the spacing between two layers of angle steel is 50mm, adjacent in same layer angle steel
Spacing between angle steel is 30mm, and the angle steel number in every layer of angle steel is 20,
Splashed so that condensing water attack on angle steel, form tiny current, it is fully dispersed, increase the surface area of current, improve
The deaerating effect of condenser, so as to reduce the dissolved oxygen of condensate.
Furthermore it is also possible to transformed as follows：1b) condensate pump is run under negative pressure state, and it uses packing
The mode of encryption water shutoff seals, the press water that sealing water exports 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 in 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 utility model is using helium mass spectrometer detector to condensing
Pump entrance pipeline and its sealing of condensate pump body are detected, when helium mass spectrometer detector has data reflection, if helium matter
Spectrometer show value is more than 1.0E-06 numerical value, to the part of appliance detected, carries out sealing replacing.
In addition, be discharged into condenser it is additional it is hydrophobic substantially have it is 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, and position selection is improper, parameter is improper due to being discharged into,
Excessive Dissolved Oxygen in Condensate can be caused.Particularly demineralized water, only it is chemically treated, does not carry out deep deoxygenization, work as rate of water make-up
Increase during spray equipment imperfection, be then 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 part is hydrophobic to enter condenser (steam discharge
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 utility model, and are being discharged into cylinder
The interior mouth of pipe installs nozzle additional, and the hydrophobic change for making to enter in cylinder nebulizes, so that the partial coagulation water enters the secondary deoxygenation of cylinder interior
Effect.
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 the requires of the utility model condensate pump must have a certain amount of current in operation
Go out, it is ensured that will not leak into air between condensation pump pump shaft.If pump shaft is watertight in operation, air certainly will be caused to leak into
In pump, make the dissolved oxygen of condensate increase, therefore, 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, the economy and security of generating set are directly influenced, 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
More than 100 μ g/L scope, pertinent regulations, super-pressure unit condensate generally are supervised more than power technology for the dissolved oxygen of group condensate
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 are that generating set exhaust casing throat design water charging system is unreasonable, cause to condense
Water moisturizing oxygen content directly fills into and Excessive Dissolved Oxygen in Condensate is caused in condenser close to saturation.
Condensing equipment is in high vacuum when running, excessive air, which leaks into, can cause generating set vacuum to drop
It is low, increase the aggregate amount of air in condenser, aggravate the burden of pumped vacuum systems, prevent the noncondensing gas of condenser from taking out in time
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, the operating pressure of condenser is improved, reduce the thermal efficiency of unit, the electricity consumption of increase power plant.
Claims (3)
1. a kind of exceeded governing system of thermal power generation unit condensate dissolved oxygen content, it is characterised in that including boiler, be arranged on pot
Multigroup tandem turbine on stove, the condenser being connected respectively by vacuum pipe system with multigroup tandem turbine, institute
State condenser and condensate pump is connected by vacuum pipe system, the condensate pump is connected at condensate by vacuum pipe system
Reason system, is additionally provided with make up water treatment system at condenser, and the condensate polishing system is connected by vacuum pipe system
Multiple series connection low-pressure heaters are connect, multiple series connection low-pressure heaters are connected with oxygen-eliminating device by vacuum pipe system respectively, deoxygenation
Device is connected to multiple tandem high pressure heaters by vacuum pipe system through small pump, and multiple tandem high pressure heaters pass through vacuum
Pipe-line system is connected respectively with boiler and multigroup tandem turbine respectively；
Air-cooled Unit is respectively arranged with multigroup tandem turbine, adjustment module, institute are provided with the Air-cooled Unit
State the rotating speed that adjustment module is used to automatically adjust air cooling blower fan by vacuum values and degree of supercooling；
One helium mass spectrometer detector, is arranged at vacuum pipe system；
The moisturizing of the make up water treatment system output is respectively enterd in the moisturizing branch pipe being evenly arranged after averagely shunting, Ran Houzai
Sprayed into through the atomizer on moisturizing branch pipe in condenser；And the extraction negative pressure of the air header is higher than condensate tank deoxygenation
Head.
2. the exceeded governing system of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that；Institute
State and float ring seal is provided with condensate pump, the float ring seal is made up of multistage radial floating ring and support ring, in multistage
The centre of radial floating ring is passed through high pressure sealing water, and small radial clearance between axle sleeve be present, the high pressure sealing being passed through
Water reaches axial seal by this small gap reducing pressure by regulating flow, between the radial direction between multistage radial floating ring and support ring
Gap, acted on by high pressure sealing water on the other end of multistage radial floating ring, to reach radial seal, complete dynamic regulation.
3. the exceeded governing system of thermal power generation unit condensate dissolved oxygen content according to claim 1, it is characterised in that；Institute
State make up water treatment system and also include chemical moisturizing guard system, the chemical moisturizing guard system is arranged on multigroup tandem turbine
Throat, it is respectively：First group is respectively arranged 120 in 9 meters of layer position exhaust casing surroundings of throat's absolute altitude and (30 is arranged per one side
3.0L/min) atomizer, second group is respectively arranged 160 in 8 meters of layer position surroundings of exhaust casing throat absolute altitude and (is arranged per one side
40 3.0L/min) atomizer, meet generating set normal operation moisturizing, the 3rd group in 7 meters of layer positions four of exhaust casing absolute altitude
Arrange 160 (40 5.0L/min are arranged per one side) atomizers week, the 3rd group as the standby benefit of multigroup tandem turbine
Water, used when rate of water make-up in the case of multigroup tandem turbine heat supply increases；Moisturizing nozzle is selected to be fanned for low discharge hollow cone
Shape nozzle.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255270A (en) * | 2017-06-29 | 2017-10-17 | 西安亨特电力科技有限公司 | A kind of exceeded administering method of thermal power generation unit condensate dissolved oxygen content |
| CN113860414A (en) * | 2021-09-02 | 2021-12-31 | 华电湖北发电有限公司武昌热电分公司 | Heat supply first station condensation return water nitrogen regulation deoxidization system |
-
2017
- 2017-06-28 CN CN201720763500.XU patent/CN206890501U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255270A (en) * | 2017-06-29 | 2017-10-17 | 西安亨特电力科技有限公司 | A kind of exceeded administering method of thermal power generation unit condensate dissolved oxygen content |
| CN113860414A (en) * | 2021-09-02 | 2021-12-31 | 华电湖北发电有限公司武昌热电分公司 | Heat supply first station condensation return water nitrogen regulation deoxidization system |
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