CN206037003U - Secondary reheating unit EC BEST steam turbine steam exhaust heating deoxidization boiler feed water's thermodynamic system - Google Patents
Secondary reheating unit EC BEST steam turbine steam exhaust heating deoxidization boiler feed water's thermodynamic system Download PDFInfo
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- CN206037003U CN206037003U CN201620989640.4U CN201620989640U CN206037003U CN 206037003 U CN206037003 U CN 206037003U CN 201620989640 U CN201620989640 U CN 201620989640U CN 206037003 U CN206037003 U CN 206037003U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 238000003303 reheating Methods 0.000 title abstract description 8
- 238000000605 extraction Methods 0.000 claims abstract description 19
- 238000010248 power generation Methods 0.000 claims description 57
- 238000006392 deoxygenation reaction Methods 0.000 claims description 33
- 230000005611 electricity Effects 0.000 claims description 10
- 230000002209 hydrophobic effect Effects 0.000 claims description 9
- 210000004907 gland Anatomy 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 238000009998 heat setting Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000003795 desorption Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 17
- 230000001172 regenerating effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000010977 unit operation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000006213 oxygenation reaction Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Abstract
The utility model discloses a secondary reheating unit EC BEST steam turbine steam exhaust heating deoxidization boiler feed water's thermodynamic system, steam gets into the secondary reheating unit super -high pressure cylinder acting by the boiler, and the steam extraction gets into the boiler respectively and heats once more, do you get into EC the BEST steam turbine does work and provides high pressure heater and draws gas, the high pressure feed water heater heating boiler feedwater gets into. After getting into the steam reheat of boiler, get into the acting of high, medium and low pressure jar, the steam extraction is the condensate water in the condenser condensation, and the pump is congealed to the one -level of flowing through in proper order, and bearing seal, low pressure mixing heater, second grade congeal the pump, and surperficial formula is low to be added, the water -feeding pump, and surperficial formula high pressure heater gets into the boiler at last and accomplishes the circulation. Do you get into EC low pressure mixing heater, heating deoxidization condensate water are introduced to steam extraction after the steam acting of BEST steam turbine. This low pressure mixing heater utilizes little quick -witted steam extraction to heat the low temperature and low pressure condensate water to the saturation water state, and with oxygen and other the incondensable gas desorptions that dissolves in the condensate water, use of surface formula low pressure feed water heater replaces the oxygen -eliminating device, and does not need a high position to arrange.
Description
Technical field
The utility model is related to the therrmodynamic system that a kind of turbine discharge heats deoxygenation boiler feedwater, and in particular to Yi Zhongchao
Supercritical double-reheat generating set configures EC-BEST (Echelon Cycle-Backpressure Extraction Steam
Turbine) the therrmodynamic system of steam turbine and the heating deoxygenation boiler feedwater of EC-BEST turbine discharges.
Background technology
In the circulation system of ultra supercritical double reheat generating set, boiler produce steam ultra-high pressure cylinder,
High pressure cylinder is heated in returning the single reheat device of boiler, secondary reheater after doing work respectively again, compares single reheat system, vapour
Turbine increases a ultra-high pressure cylinder, and the part steam discharge of ultra-high pressure cylinder does work into EC-BEST steam turbines, and provides high-pressure feed water system
Regenerative steam needed for system, EC-BEST turbine discharges enter oxygen-eliminating device.Subject matter present in the therrmodynamic system is once
After reheating and double reheat, the temperature drawn gas is higher, and the degree of superheat is big, and the energy of superheat section is also used to heating with the latent heat of vaporization
Boiler feedwater, affects unit efficiency of thermal cycle.
It is to prevent the oxygen of circulation system right under the high temperature conditions to arrange oxygen-eliminating device in circulation system
The oxide etch of boiler feedwater pipeline, boiler heating surface and heat exchanger, eliminates the incondensable gases such as oxygen and heat exchange is imitated
The impact of rate, it is ensured that the Steam-water Quality of circulation system.Oxygen-eliminating device is arranged in low pressure condensate water system and high-pressure feed water system
Between.Oxygen-eliminating device is heated to boiler feedwater the saturation temperature under relevant pressure using extracted steam from turbine, and reclaims heater
Steam that hydrophobic and boiler blow down flash device is produced etc., to reduce the loss of steam and water of power plant.But with thermal power generation technology to
The aspects such as Large Copacity, high parameter develop, and research finds that the particular procedure technique of original feedwater has flowing accelerated corrosion, in feedwater
Under the reproducibility environment of deoxygenation, the Fe that metal erosion is generated3O4Short texture, it is impossible to make metal enter passivation region.Added by feedwater
The mode of oxygen process, makes the reproducibility environment of boiler feedwater be converted into oxidative environment, by original Fe3O4Film becomes fine and close
Fe2O3Diaphragm, can suppress the generation of pipeline and equipment flowing accelerated corrosion.The employing of feed water oxygenation technology is to existing heating power
The oxygen-eliminating device of system standard configuration proposes challenge, and its deoxygenation function reduction even becomes unnecessary.Also there is following disadvantage in oxygen-eliminating device
End：(1) cause boiler feedwater flow process complicated, and reduce unit operation economy.By backheat on the basis of oxygen-eliminating device operating pressure
System is divided into low pressure heat regenerative system and high-pressure extraction system.In high-pressure extraction system, before feed pump is for preventing cavitation erosion from needing to arrange
Pump is put, and in order to ensure fore pump safe operation, oxygen-eliminating device must high-order arrangement.In low pressure heat regenerative system, condensate pump will be selected
Select high-lift, to overcome the oxygen-eliminating device on-way resistance of high-order arrangement.There is " a boosting (solidifying pump)-step-down in whole water supply system
(oxygen-eliminating device)-boosting (fore pump)-boosting (feed pump) " process, flow process is complicated and energy loss is huge.(2) increase engineering base
Plinth is invested.The high-order arrangement of oxygen-eliminating device increased Thermal Power Station's civilwork engineering quantity, and increased condensing water conduit and supply line
Length.In main building, dispose the deaerator bay of oxygen-eliminating device to increase the distance between boiler room and steam turbine building, and it is big to increased four
Pipeline investment and pipeline crushing.(3), there is potential safety hazard in high temperature and high pressure containers, increase safety management and in-service surveillance workload.
In Thermal Power Station, oxygen-eliminating device belongs to a type III pressure vessel, and which is bulky, and cost is higher, stores huge medium energy,
Once explosion or leakage, very harmful.The rupture of deoxygenation water tank occurred both at home and abroad causes the accident of casualties.
At present, increasing ultra supercritical double reheat power generation sets are in normal operation, using Feedwater oxygen treatment mode.
Cancel original deaerator equipment, reduce the regenerative steam degree of superheat, be optimized design to circulation system, reduce heating power thermoelectricity
Factory engineering cost and raising Unit Economic performance, are ultra supercritical double reheat power generation sets therrmodynamic system development trends.
Utility model content
For the above-mentioned deficiency of the ultra supercritical double reheat therrmodynamic system of prior art, the utility model provides a kind of two
Secondary reheating embrittlement EC-BEST turbine discharges heat the therrmodynamic system of deoxygenation boiler feedwater, can reduce EC-BEST steam turbines row
Vapour back pressure, increases unit generation amount；Oxygen-eliminating device and fore pump can be cancelled, simplify boiler feedwater flow process；Large Copacity can be reduced
High temperature and high pressure containers, improve unit safety；The high pressure extraction degree of superheat can be reduced, unit economy is improved；Being capable of " zero end
Difference " utilizes EC-BEST turbine discharges, improves effectiveness of regenerator；Low-pressure heater can be reclaimed hydrophobic, reduce condenser cold end and damage
The ultra supercritical double reheat power generation sets therrmodynamic system of mistake.
In order to solve above technical problem, the technical solution of the utility model is：
A kind of double reheat power generation sets EC-BEST turbine discharges heat the therrmodynamic system of deoxygenation boiler feedwater, including boiler,
Described boiler includes air intake I, the venthole I for the connecting and air intake II and venthole II for connecting；Venthole I and it is secondary again
Heat engine group ultra-high pressure cylinder air intake is connected；The steam drain of described double reheat power generation sets ultra-high pressure cylinder again enters vapour with boiler respectively
The mouth air intake of II, EC-BEST steam turbine is connected with the air intake of high-pressure heater；Described EC-BEST steam turbines are driving
Boiler feed pump；The venthole II of the boiler is connected with the high pressure cylinder of the double reheat power generation sets being sequentially connected in series, intermediate pressure cylinder, low pressure (LP) cylinder
It is logical, drive double reheat power generation sets to generate electricity；The exhaust steam outlet of described double reheat power generation sets is coagulated with the condenser, one-level being sequentially connected in series
Bear water pump, gland heater, low pressure contact(-type) heater, two grades of condensate pumps, multistage surface-type low-pressure heater, boiler feedwaters
Pump is connected with multistage surface-type high-pressure heater；And along boiler feedwater direction, the steam positioned at the high-pressure heater of final stage goes out
Mouth is connected with air intake I；It is connected by low pressure condensate water pipeline between multistage surface-type low-pressure heater, and in low pressure condensate water
Chemical feeding points are set on pipeline.In double reheat power generation sets, low pressure (LP) cylinder draws gas backheat condensate；EC-BEST extracted steam from turbine backheat pots
Stove feeds water.System does not set oxygen-eliminating device, and the steam drain of EC-BEST steam turbines is connected with the air intake of low pressure contact(-type) heater, plus
Hot deoxygenation low-temp low-pressure condensate.
Further, before described hybrid low-pressure heater can be independently disposed to any one-level surface-type low-pressure heater
Or after, can also substitute any one-level surface-type low-pressure heater, receive in double reheat power generation sets, low pressure (LP) cylinder draws gas.
Further, along boiler feedwater flow direction, first order surface-type low-pressure heater it is hydrophobic enter it is hybrid low
In pressure heater.
Further, the vapour side joint in described low pressure contact(-type) heater enters auxiliary steam and carrys out heat-setting water.
Further, described one-level condensate pump, its lift need to only meet low pressure contact(-type) heater feed-water intake pressure
Power；Two grades of described condensate pumps, its lift need to only meet the edge of the low-pressure heater before boiler feedwater to feed pump and pipeline
Journey resistance.
Further, along boiler feedwater flow direction, positioned at the surface-type low-pressure heating of boiler feedwater pump intake previous stage
Device is replaced from steam heater.
Further, any one-level surface-type low-pressure heater or surface-type high-pressure heater all can select steam-water mixing
Device replaces.
Further, described EC-BEST steam turbines are provided with multichannel extraction line and are connected with surface-type high-pressure heater
Logical, the high-pressure heater of any one-level all arranges outer steam cooler.
Further, the surface-type low-pressure heater or surface-type high-pressure heater of any one-level is respectively provided with drainage pump.
Compared with prior art, the beneficial effects of the utility model are：
(1) cancel oxygen-eliminating device, reduce Large Copacity high-temperature high-pressure apparatus, improve unit safety.Adopt in the utility model
Thermal de-aeration low-temp low-pressure condensate in low pressure contact(-type) heater is entered with EC-BEST turbine discharges；Using with deoxygenation
The condenser equipment of function；Using boiler feedwater oxygenation technique, chemical chemical feeding points are set on low pressure condensate water pipeline, three are arranged
Apply Collaborative Control boiler feedwater oxygen content, it is ensured that in unit running process, feedwater oxygen content meets requirement.With prior art phase
Than the utility model no longer needs to arrange oxygen-eliminating device.Oxygen-eliminating device belongs to a type III pressure vessel, and HTHP is bulky, high-order
Arrangement, stores huge medium energy, once explosion or leakage, very harmful, constitutes greatly safety to unit uninterrupted service hidden
Suffer from.The utility model improves unit safety.
(2) EC-BEST turbine discharge back pressures are reduced, increased EC-BEST steam turbine power generation amounts.According to station service need
Ask, EC-BEST steam turbines can be equipped with small generators, supplying power for outside.In prior art, the steam discharge of EC-BEST steam turbines enters
Enter oxygen-eliminating device, limited by oxygen-eliminating device operating pressure, EC-BEST turbine discharges back pressure is high and temperature is high, the energy grade of steam discharge
Higher, the ability for generating electricity of still doing work with pushing turbine is but used directly to heat the boiler feedwater in oxygen-eliminating device.This reality
In new, the steam discharge of EC-BEST steam turbines is entered in low pressure contact(-type) heater, for heating low-temp low-pressure condensate, its
The running parameter of exhaust pressure and temperature far smaller than oxygen-eliminating device, the energy grade of steam discharge are extremely low, and very big limit is using in steam discharge
Energy increased EC-BEST steam turbine power generation amounts.
(3) condenser cold end loss is reduced, improves unit economy.In prior art, main steam turbine low pressure (LP) cylinder final stage is taken out
The hydrophobic cold end loss for being directly discharged in condenser, increased condenser of the corresponding low-pressure heater of vapour.In the utility model,
Along boiler feedwater direction, the hydrophobic of corresponding low-pressure heater of drawing gas enters in low pressure contact(-type) heater the first order, is used for
Heating low-temp low-pressure condensate, reduces into the hydrophobic amount in condenser, reduces cold end loss, improve systematic economy
Property.
(4) simplify boiler feedwater flow process.In prior art, the feed pump of high-pressure extraction system is to prevent the needs that cavitate
Fore pump is set, and in order to ensure fore pump safe operation, oxygen-eliminating device must high-order arrangement；The condensate pump of low pressure heat regenerative system
Select high-lift, to overcome the oxygen-eliminating device on-way resistance of high-order arrangement.Whole water supply system presence one " boosting (solidifying pump)-
Step-down (oxygen-eliminating device)-boosting (fore pump)-boosting (feed pump) " process, flow process is complicated and energy loss is huge.The utility model
In, oxygen-eliminating device being changed to into surface heater, and cancels the fore pump of feed pump, the intake pressure of feed pump is by two grades of condensates
Pump is provided after low-pressure heaters at different levels, and whole water supply system is reduced to "-boosting (two grades of solidifying pumps)-of boosting (one-level coagulates pump)
Boosting (feed pump) " process.
(5) reduce unit operation control difficulty.As oxygen-eliminating device is changed to surface heater, original deaerator storage tank water
Position need not control, and can cancel the deaerator level regulation station of condensate system, and condensate pump adopts variable frequency adjustment, makes condensation
The water yield meets the needs of load variations.
(6) reduce condensate pump lift.In prior art, for preventing feed pump and preposition pump cavitation, oxygen-eliminating device from all adopting
With high-order arrangement, cause condensate pump lift larger, need to overcome the resistance of surface-type low-pressure heaters at different levels, pipeline valve edge
Journey resistance, and the arrangement height of oxygen-eliminating device.In the utility model, low pressure contact(-type) heater high-order need not be arranged, one-level
Condensate pump lift need to only meet condensate saturation pressure and on-way resistance in low pressure contact(-type) heater.Two grades of condensate pumps
Lift need to only meet low-pressure heater resistances at different levels and the pipeline valve on-way resistance that condensate is flowed through to before entrance of water-supplying pump.Two
The lift summation of level condensate pump is less than lift needed for prior art.
(7) station-service electricity is saved, improves Benefit of Unit.In the utility model, low pressure contact(-type) heater need not a high position
Arrangement, the lift summation of two-stage condensate pump need to match somebody with somebody less than the solidifying pump lift needed for the high-order arrangement of oxygen-eliminating device in prior art
Standby condensate pump power reduction, the power plant's own demand in running are reduced, and unit supplying power for outside amount increases, and economy is carried
It is high.
(8) save engineering foundation investment.Oxygen-eliminating device instead of using surface heater in the utility model, height is eliminated
Position arrangement, reduces foundation of civil work quantities, and reduces the length of condensing water conduit and supply line.In the utility model
Deaerator bay is eliminated in power plant main power house, is reduced the distance between boiler room and steam turbine building, and is reduced four big pipeline investments
With pipeline crushing, construction investment is saved, and improves system effectiveness.
(9) reduce system cost.Draw gas from EC-BEST steam turbines in the utility model, extraction temperature is low, reduce phase
Extraction line, valve, the material rate of heater is closed, the manufacturing cost of pipeline, valve and equipment has been saved；EC-BEST steamers
High pressure cylinder steam discharge of the machine vapour source for main steam turbine, this some vapor will not enter back into reheat system, and can substantially reduce and enter reheating
The steam flow of device, reduces the heat exchange area of reheater, so as to reduce the cost of reheat system.
(10) degree of superheat of extracted steam from turbine is reduced, unit economy is improve.It is in prior art, single reheat, secondary
Reheating Turbo-generator Set is drawn gas from big steam turbine, and extraction temperature is high, the degree of superheat is big.Using secondary in the utility model
The part steam discharge of reheating embrittlement ultra-high pressure cylinder drives EC-BEST steam turbines, draws gas, using the degree of superheat from EC-BEST steam turbines
Relatively low draws gas and steam discharge, comes heat-setting water and feedwater into heater, can improve efficiency of thermal cycle.
Description of the drawings
With reference to the accompanying drawings and examples the utility model is further illustrated.
Fig. 1 is the heating power that double reheat power generation sets EC-BEST turbine discharges of the present utility model heat deoxygenation boiler feedwater
The system diagram of system.
Fig. 2 is the heating power that double reheat power generation sets EC-BEST turbine discharges of the present utility model heat deoxygenation boiler feedwater
System mesolow contact(-type) heater receives the system that EC-BEST turbine discharges and double reheat power generation sets final stage are drawn gas simultaneously
Figure.
Fig. 3 is the heating power that double reheat power generation sets EC-BEST turbine discharges of the present utility model heat deoxygenation boiler feedwater
System mesolow contact(-type) heater receives EC-BEST turbine discharges simultaneously and double reheat power generation sets penultimate stage low pressure is taken out
The system diagram of vapour.Wherein, the low-pressure pumping steam of the double reheat power generation sets of connection can be any one level.
Fig. 4 is the heating power that double reheat power generation sets EC-BEST turbine discharges of the present utility model heat deoxygenation boiler feedwater
System diagram of the entrance of water-supplying pump previous stage low-pressure heater using steam heater in system.Wherein, any one-level feedwater (condenses
Water) heater can adopt steam heater.
Fig. 5 is the heating power that double reheat power generation sets EC-BEST turbine discharges of the present utility model heat deoxygenation boiler feedwater
In system, draw gas corresponding heater of double reheat power generation sets level third from the bottom arranges the system diagram of drainage pump.Wherein, any one-level
Feedwater (condensate) heater can arrange drainage pump.
Fig. 6 is the heating power that double reheat power generation sets EC-BEST turbine discharges of the present utility model heat deoxygenation boiler feedwater
In system, final stage feed-water heater (feedwater flow direction) arranges the system diagram of outer steam cooler.Wherein, any one-level is given
Water (condensate) heater can arrange outer steam cooler.
In figure：1. boiler；2. double reheat power generation sets ultra-high pressure cylinder；3. double reheat power generation sets high pressure cylinder；4. double reheat machine
Group intermediate pressure cylinder；5. double reheat power generation sets low pressure (LP) cylinder；6. generator；7.EC-BEST steam turbines；8. condenser；9. one-level condensate
Pump；10. gland heater；11. low pressure contact(-type) heaters；12. 2 grades of condensate pumps；13. surface-type low-pressure heaters；14.
Boiler feed pump；15. surface-type high-pressure heaters；16. steam heaters；17. drainage pumps；18. outer steam coolers.
Specific embodiment
Below in conjunction with the accompanying drawings the utility model is described in detail：
The technical solution of the utility model is that a kind of double reheat power generation sets EC-BEST turbine discharges heating deoxygenation boiler is given
The therrmodynamic system of water, can cancel oxygen-eliminating device, reduce Large Copacity high-temperature high-pressure apparatus, improve unit safety；Can reduce
EC-BEST turbine discharge back pressures, increased EC-BEST steam turbine power generation amounts；Fore pump can be cancelled, simplify boiler feedwater stream
Journey technique；Unit operation control difficulty can be reduced；Condensate pump lift can be reduced；Station-service electricity can be saved, is improved
Benefit of Unit；Engineering foundation investment can be saved；System cost can be reduced；Condenser cold end loss can be reduced, machine is improved
Group economy；The degree of superheat of extracted steam from turbine can be reduced, the ultra supercritical double reheat power generation sets heat of unit economy is improve
Force system.
For the deficiency of the double reheat therrmodynamic system of prior art, in order to solve above technical problem, the utility model
A kind of double reheat power generation sets EC-BEST turbine discharges of offer heat the therrmodynamic system of deoxygenation boiler feedwater, mainly solve
The following technical problem that existing therrmodynamic system is present：
(1) oxygen-eliminating device is set in existing system, is jumbo high-temperature high-pressure apparatus, there is potential safety hazard, reduce machine
Group security.If not adopting oxygen-eliminating device, the oxygen content of boiler feedwater cannot be adjusted, and unit operation security is difficult to ensure that.
(2) in existing system, EC-BEST turbine discharges back pressure is high.The steam discharge of EC-BEST steam turbines enters oxygen-eliminating device, receives
Oxygen-eliminating device operating pressure is limited, and EC-BEST turbine discharges back pressure is high and temperature is high, and the energy grade of steam discharge is higher, still has
There is the ability that pushing turbine acting generates electricity not utilized.
(3) in existing system, condenser cold end loss is big.Main steam turbine low pressure (LP) cylinder final stage is drawn gas corresponding low-pressure heater
The hydrophobic cold end loss for being directly discharged in condenser, increased condenser, reduce system economy.
(4) in existing system, boiler feedwater flow process is complicated, and the feed pump of high-pressure extraction system is to prevent the needs that cavitate
Fore pump is set, and in order to ensure fore pump safe operation, oxygen-eliminating device must high-order arrangement；The condensate pump of low pressure heat regenerative system
Select high-lift, to overcome the oxygen-eliminating device on-way resistance of high-order arrangement.Whole water supply system presence one " boosting (solidifying pump)-
Step-down (oxygen-eliminating device)-boosting (fore pump)-boosting (feed pump) " process, flow process is complicated and energy loss is huge.
(5) in existing system, unit operation control difficulty is larger.Equipped with deoxygenation water tank, its water level needs control to oxygen-eliminating device
System, need to arrange the deaerator level regulation station of condensate system, and condensate pump need to adopt variable frequency adjustment, to meet load variations
Needs.
(6) need the condensate pump lift for configuring larger in existing system.For preventing feed pump and preposition pump cavitation, deoxygenation
Device all adopts high-order arrangement, and condensate pump needs larger lift, to overcome resistance, the pipeline valve of surface-type low-pressure heaters at different levels
The arrangement height of door on-way resistance and oxygen-eliminating device.
(7) in existing system, station-service electricity is larger.The solidifying pump lift that system is equipped with is larger, and configuration power of motor is big, consumes
Station-service electricity it is also larger.
(8) in existing system, engineering foundation investment is high.The high-order arrangement of oxygen-eliminating device, increased foundation of civil work quantities, and increases
The length of condensing water conduit and supply line is added.Deaerator bay is such as set, and the distance between boiler room and steam turbine building will be bigger, meeting
Further increase by four big pipeline investments and pipeline crushing, increase construction investment.
(9) in existing system, system cost is high.Draw gas from big steam turbine, extraction temperature is high, cause related extraction line,
Valve, the material rate of equipment have high demands, and manufacturing cost is high.
(10) in existing system, the degree of superheat of extracted steam from turbine is big, reduces unit economy.Single reheat, double reheat
Turbo-generator Set is drawn gas from big steam turbine, and extraction temperature is high, and the degree of superheat is big, is directly used in heating boiler feed water, heat
Loss is big.
Specific structure is as follows：
As shown in figure 1, double reheat power generation sets EC-BEST turbine discharges heating deoxygenation boiler feedwater of the present utility model
Therrmodynamic system, mainly includes：In figure：1. boiler；2. double reheat power generation sets ultra-high pressure cylinder；3. double reheat power generation sets high pressure cylinder；4.
Double reheat power generation sets intermediate pressure cylinder；5. double reheat power generation sets low pressure (LP) cylinder；6. generator；7.EC-BEST steam turbines；8. condenser；9.
One-level condensate pump；10. gland heater；11. low pressure contact(-type) heaters；12. 2 grades of condensate pumps；13. surface-type low pressure
Heater；14. boiler feed pumps；15. surface-type high-pressure heaters.
Described boiler includes air intake I, the venthole I for the connecting and air intake II and venthole II for connecting；Venthole I
Connect with double reheat power generation sets ultra-high pressure cylinder air intake；The steam drain of described double reheat power generation sets ultra-high pressure cylinder again respectively with pot
The air intake of air intake II, EC-BEST steam turbine of stove is connected with the air intake of high-pressure heater；The venthole II of the boiler
Connect with the double reheat power generation sets high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder that are sequentially connected in series, drive Turbo-generator Set to generate electricity；Described
The exhaust steam outlet of double reheat power generation sets it is hybrid with the condenser, one-level condensate pump, gland heater, low pressure that are sequentially connected in series plus
Hot device, two grades of condensate pumps, multistage low-pressure heater, boiler feed pumps are connected with multistage pressure heater；And give along boiler
Water direction, the steam (vapor) outlet positioned at the high-pressure heater of final stage are connected with air intake I.
Further, described multistage low-pressure heater, multistage pressure heater each include it is multiple be sequentially connected in series it is low
Pressure heater or multiple high-pressure heaters being sequentially connected in series, and low-pressure heater and high-pressure heater are surface-type heating
Device.
Specific works mode is：
Steam is flowed out by boiler 1, is done work in double reheat power generation sets ultra-high pressure cylinder 2, and steam discharge is divided into three tunnels, the first via
Return boiler to heat again, the second tunnel enters does work and provide high pressure extractions at different levels in EC-BEST steam turbines 7, the 3rd tunnel enters
Heating boiler feed water in high-pressure heater 15.
The steam for returning boiler 1 flows out again, sequentially enters in double reheat power generation sets high pressure cylinder 3, intermediate pressure cylinder 4, low pressure (LP) cylinder 5
Acting, drives generator 6 to generate electricity, finally becomes exhaust steam, be condensed into condensate in condenser 8, flow into one-level condensate pump 9
Middle boosting, flows through gland heater 10, and in low pressure contact(-type) heater 11, heated deoxygenation, into two grades of condensate pumps
12, flow through surface-type low-pressure heaters 13 at different levels after boosting step by step, into boiler feed pump 14, after boosting, become high-pressure feed water,
Surface-type high-pressure heaters 15 at different levels are flowed through step by step, are finally entered boiler and are completed circulation.
EC-BEST turbine discharges are introduced into low pressure contact(-type) heater in the utility model, deoxygenation low-temp low-pressure is heated
Condensate.
Oxygen-eliminating device of the prior art is replaced using surface-type low-pressure heater in the utility model, and no longer carries out a high position
Arrangement.
Low-temp low-pressure condensate is heated to by the low pressure contact(-type) heater adopted in the utility model using little machine steam discharge
Saturated-water phase, the oxygen dissolved in condensate and other incondensable gases are removed.
Before or after in the utility model, hybrid low-pressure heater can be independently disposed to any one-level low-pressure heater,
Can substitute any one-level surface-type low-pressure heater, receive in double reheat power generation sets, low pressure (LP) cylinder draws gas.
In the utility model, hybrid low-pressure heater can draw gas bleeder heater (along boiler for the boiler feedwater first order
Feedwater flow direction, disregards gland heater), the hydrophobic of second level surface-type low-pressure heater enters low pressure contact(-type) heater
In, condenser is no longer entered, the cold end loss produced in condenser is reduced.
The low pressure contact(-type) heater adopted in the utility model can enter auxiliary steam come heat-setting water in vapour side joint.
The condenser adopted in the utility model has deoxygenation function.
In the utility model, boiler feedwater adopts oxygenated treatment, can arrange dosing on arbitrary low pressure condensate water pipeline
Point, during unit normally runs, the oxygen content in feedwater is adjusted by chemical feeding quantity.
In the utility model, condenser outlet arranges one-level condensate pump, and its lift need to only meet low pressure contact(-type) heater
Feed-water intake pressure；Low pressure contact(-type) heater outlet arrange two grades of condensate pumps, its lift need to only meet boiler feedwater to
The on-way resistance of low-pressure heater and pipeline before water pump.
In the utility model in addition to hybrid low-pressure heater, such as other low-pressure heaters all adopt surface-type, can be with
Cancel the fore pump of boiler feedwater pump intake, entrance of water-supplying pump pressure is directly provided by two grades of condensate pumps.
In the utility model, the low-pressure heater of boiler feedwater pump intake previous stage (along boiler feedwater flow direction) can be with
From steam heater, to reduce the heat exchange difference of heater.
In the utility model, any one surface-type high pressure or low-pressure heater can select steam heater.
In the utility model, Turbo-generator Set is extra-supercritical unit.
Therrmodynamic system of the Turbo-generator Set using double reheat in the utility model.
Using the EC-BEST steam turbines of EC-BEST two-shipper heat regenerative systems driving boiler feed pump in the utility model.
In the utility model, EC-BEST steam turbines are equipped with small generators.
In fig. 2, low pressure contact(-type) heater 11 receives BEST turbine discharges simultaneously and the final stage of big steam turbine is drawn gas,
In Fig. 2, no the part implication of mark is not identical with Fig. 1.
In figure 3, low pressure contact(-type) heater 11 receives the penultimate stage of BEST turbine discharges and big steamer simultaneously
Low-pressure pumping steam.Wherein, the low-pressure pumping steam of the big steam turbine of connection can be any one level；In Fig. 3 no the part implication of mark with
It is identical in Fig. 1.
In the diagram, entrance of water-supplying pump previous stage low-pressure heater adopts steam heater.Wherein, any one-level high pressure or
Low-pressure heater (feedwater or condensation water heater) can adopt steam heater；In Fig. 4 no the part implication of mark with
It is identical in Fig. 1.
In Figure 5, draw gas corresponding heater of big steam turbine level third from the bottom arranges drainage pump.Wherein, any one-level is high
Pressure or low-pressure heater (feedwater or condensation water heater) can arrange drainage pump；In Fig. 5 no the part implication of mark with
It is identical in Fig. 1.
In figure 6, final stage feed-water heater (feedwater flow direction) arranges outer steam cooler.Wherein, any one-level
High pressure or low-pressure heater (feedwater or condensation water heater) can arrange outer steam cooler；Do not mark in Fig. 6
Part implication is identical with Fig. 1.Although the above-mentioned accompanying drawing that combines is described to specific embodiment of the present utility model,
But the not restriction to the utility model protection domain, one of ordinary skill in the art are should be understood that in technology of the present utility model
On the basis of scheme, various modifications or deform still at this that those skilled in the art are made by need not paying creative work
Within the protection domain of utility model.
Claims (9)
1. a kind of double reheat power generation sets EC-BEST turbine discharges heat the therrmodynamic system of deoxygenation boiler feedwater, including boiler, institute
The boiler stated includes air intake I, the venthole I for the connecting and air intake II and venthole II for connecting；Venthole I and double reheat
Unit ultra-high pressure cylinder air intake is connected；Characterized in that, the steam drain of described double reheat power generation sets ultra-high pressure cylinder again respectively with
The air intake of air intake II, EC-BEST steam turbine of boiler is connected with the air intake of high-pressure heater；Described EC-BEST vapour
Turbine is driving boiler feed pump；The venthole II of the boiler and the high pressure cylinder of the double reheat power generation sets being sequentially connected in series, middle pressure
Cylinder, low pressure (LP) cylinder connection, drive double reheat power generation sets to generate electricity；The exhaust steam outlet of described double reheat power generation sets is solidifying with what is be sequentially connected in series
Vapour device, one-level condensate pump, gland heater, low pressure contact(-type) heater, two grades of condensate pumps, multistage surface-type low-pressure heatings
Device, boiler feed pump are connected with multistage surface-type high-pressure heater；And along boiler feedwater direction, positioned at the hyperbaric heating of final stage
The steam (vapor) outlet of device is connected with air intake I；It is connected by low pressure condensate water pipeline between multistage surface-type low-pressure heater, and
On low pressure condensate water pipeline, chemical feeding points are set.
2. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that before described hybrid low-pressure heater can be independently disposed to any one-level surface-type low-pressure heater or
Afterwards, can also substitute any one-level surface-type low-pressure heater, receive in double reheat power generation sets, low pressure (LP) cylinder draws gas.
3. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that along boiler feedwater flow direction, the hydrophobic of first order surface-type low-pressure heater enter hybrid low pressure and add
In hot device.
4. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that enter auxiliary steam in the vapour side joint of described low pressure contact(-type) heater and carry out heat-setting water.
5. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that described one-level condensate pump, its lift need to only meet low pressure contact(-type) heater feed-water intake pressure；
Two grades of described condensate pumps, its lift need to only meet the low-pressure heater before boiler feedwater to feed pump and hinder along journey with pipeline
Power.
6. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that along boiler feedwater flow direction, the surface-type low-pressure heater positioned at boiler feedwater pump intake previous stage is selected
Replaced with steam heater.
7. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that arbitrarily one-level surface-type low-pressure heater or surface-type high-pressure heater all can select steam heater
Replace.
8. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that described EC-BEST steam turbines are provided with multichannel extraction line and are connected with surface-type high-pressure heater,
The high-pressure heater of arbitrarily one-level all arranges outer steam cooler.
9. double reheat power generation sets EC-BEST turbine discharges as claimed in claim 1 heat the heating power system of deoxygenation boiler feedwater
System, it is characterised in that the surface-type low-pressure heater or surface-type high-pressure heater of arbitrarily one-level is respectively provided with drainage pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620989640.4U CN206037003U (en) | 2016-08-30 | 2016-08-30 | Secondary reheating unit EC BEST steam turbine steam exhaust heating deoxidization boiler feed water's thermodynamic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620989640.4U CN206037003U (en) | 2016-08-30 | 2016-08-30 | Secondary reheating unit EC BEST steam turbine steam exhaust heating deoxidization boiler feed water's thermodynamic system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108049922A (en) * | 2018-01-08 | 2018-05-18 | 华北电力大学 | A kind of width operating mode double reheat two-shipper heat regenerative system |
| CN108626715A (en) * | 2017-03-24 | 2018-10-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Heat regenerative system equipped with multistage deaerator |
| CN109296413A (en) * | 2018-10-30 | 2019-02-01 | 中国华能集团清洁能源技术研究院有限公司 | A bypass secondary reheat power generation device and method using deep seawater cooling |
| CN110793007A (en) * | 2019-10-25 | 2020-02-14 | 上海发电设备成套设计研究院有限责任公司 | Reheating steam combined middle-exhaust steam heating water supply and heat supply system and method |
| CN113932213A (en) * | 2020-07-14 | 2022-01-14 | 国家能源投资集团有限责任公司 | Steam Turbine Unit Steam-Water System and Coal-fired Generator Unit |
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2016
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626715A (en) * | 2017-03-24 | 2018-10-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Heat regenerative system equipped with multistage deaerator |
| CN108049922A (en) * | 2018-01-08 | 2018-05-18 | 华北电力大学 | A kind of width operating mode double reheat two-shipper heat regenerative system |
| CN109296413A (en) * | 2018-10-30 | 2019-02-01 | 中国华能集团清洁能源技术研究院有限公司 | A bypass secondary reheat power generation device and method using deep seawater cooling |
| CN109296413B (en) * | 2018-10-30 | 2024-01-30 | 中国华能集团清洁能源技术研究院有限公司 | Bypass secondary reheating power generation device and method cooled by deep seawater |
| CN110793007A (en) * | 2019-10-25 | 2020-02-14 | 上海发电设备成套设计研究院有限责任公司 | Reheating steam combined middle-exhaust steam heating water supply and heat supply system and method |
| CN113932213A (en) * | 2020-07-14 | 2022-01-14 | 国家能源投资集团有限责任公司 | Steam Turbine Unit Steam-Water System and Coal-fired Generator Unit |
| CN113932213B (en) * | 2020-07-14 | 2024-04-05 | 国家能源投资集团有限责任公司 | Steam-water system of power generation turbine unit and coal-fired power generation unit |
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