CN107110488A - Feed water preheating system bypass - Google Patents
Feed water preheating system bypass Download PDFInfo
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- CN107110488A CN107110488A CN201580069782.7A CN201580069782A CN107110488A CN 107110488 A CN107110488 A CN 107110488A CN 201580069782 A CN201580069782 A CN 201580069782A CN 107110488 A CN107110488 A CN 107110488A
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- fwph
- water
- temperature
- separative element
- feedwater
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
- F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/08—Control systems for steam boilers for steam boilers of forced-flow type of forced-circulation type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/025—Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
- F22D1/12—Control devices, e.g. for regulating steam temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention provides method of the operation for the feedwater preheating system (10) of heat recovery steam generator (HRSG), feedwater preheating system includes water separative element (22), evaporator (16) and is attached to the feedwater pre-heater (FWPH, 14) of FWPH suction lines (18) and FWPH outlet lines (20).Methods described includes：Water is fed into FWPH (14) from condenser along FWPH suction lines (18), the heating water in FWPH (14)；Water is fed into evaporator (16) from FWPH (14) along FWPH outlet lines (20)；Make boiling water in evaporator (16), and the mixture of the steam of gained and water is fed into water separative element (22)；Monitor the LP temperature difference (Δ T) of water separative element (22)；Set the setting value of the LP temperature difference；When the LP temperature difference is less than setting value, some water are bypassed into FWPH (14) from FWPH suction lines (18) and are directed to FWPH outlet lines (20).The equipment that further aspect of the present invention includes the method for the monitoring LP temperature difference and performs methods described.
Description
Technical field
The present invention relates to gas turbine generating factory, and in particular to the feedwater preheating system for gas turbine generating factory.
Background technology
In traditional combined cycle power plant (CCPP), for example, resulted in from HRSG heaps or generator/lubrication
Inferior grade (low temperature level) heat, but do not develop.
A kind of method for improving CCPP efficiency is to reclaim used heat from CCPP.For example can be by reducing LP (low pressure) evaporations
Thus the device temperature difference simultaneously integrates more inferior grades heat from HRSG, to reclaim used heat.This produces increase LP steam, thus increases
Plus the power generation in LP steamturbines, and improve CCPP overall efficiency.
Currently, under design condition, at least 5K LP evaporator temperature difference is used.However, even for being somebody's turn to do under design point
The LP evaporator temperature difference, the LP evaporators temperature difference can reach 0K during non-design operation, at this point, in LP water supply control valves
It is likely to occur undesirable flashing and air pocket.This is when condition is not in the condition and range that CCPP has been designed (such as in portion
During separate loading) it is particularly present problem.
Another of existing design is limited in, during HRSG porch needs the operating condition of high feed temperature level
(such as when there is sulphur in flue gas during fuel gas or fuel oil operation), current design is completely around feedwater pre-add
Heat coil, and cold feedwater is directly sent to LP drums.This causes the performance in CCPP to reduce.
The content of the invention
The present invention is limited in appended independent claims, and these independent claims are should refer to now.Appurtenance
Profit lists the favourable feature of the present invention in requiring.
According to the first aspect of the invention the feedwater pre-add for heat recovery steam generator (HRSG) is operated there is provided one kind
The method of hot systems, the feedwater preheating system includes water separative element, evaporator and feedwater pre-heater (FWPH), described
Feedwater pre-heater is attached to FWPH suction lines and FWPH outlet lines, and methods described includes：Along the FWPH inlet tubes
Water is fed into the FWPH by line from condenser, and water is heated in the FWPH；Along FWPH outlet lines by water from described
FWPH is fed into the evaporator；Make boiling water in the evaporator, and the mixture of resulting steam and water is entered
It is given to the water separative element；Monitor the LP temperature difference (Δ T) of the water separative element；Set the setting value of the LP temperature difference；When
When the LP temperature difference is less than the setting value, by some water bypass the FWPH be directed to from the FWPH suction lines it is described
FWPH outlet lines.It the method increase plant efficiency and power output.When operating parameter changes, for example, work as load level
During reduction, the LP temperature difference may remain in appropriate level.In addition, in LP water supply control valves, can minimize or avoid the occurrence of
Flashing.
In one embodiment, by monitoring water separative element water inlet temperature and water separative element steam exit temperature,
To monitor the LP temperature difference.Preferably, the water separative element water is measured using at least one resistance temperature detector (RTD)
At least one of inlet temperature and the water separative element steam exit temperature.This can improve measurement accuracy, and multiple
RTD can also provide the redundancy of part, thus also can continue in the case of one or more sensor failures into
Row operation.
In another embodiment, the setting value is less than 5K, more preferably less than preferably less than 2K, 1K.Relatively low
Setting value is preferred, and reason is to improve efficiency.
In another embodiment, the FWPH includes FWPH entrances, and methods described is further comprising the steps of：Monitor FWPH
Inlet temperature；With when the FWPH inlet temperatures are less than setting value, the downstream of water from the FWPH entrances is set to be recycled to institute
FWPH entrances are stated, and/or guide some water to bypass the FWPH.Preferably, the FWPH comprises additionally in FWPH outlets, and makes
Water is recycled from the FWPH upstreams exported.This allows preferably efficiency (due to less available energy loss), it is easier to
Control to be used for flashing steam (the other steam that thus be accordingly used in LP steamturbines) and pre-warmed for gas turbine air
HRSG flue gases leave temperature and higher feedwater Extracting temperature.
In another embodiment, the water separative element is LP drums, and entering feedwater from the FWPH includes：Water is fed into
The LP drums, are then fed into the evaporator.
It is used to include heat recovery steam generator (HRSG) combined cycle there is provided one kind according to the second aspect of the invention
The feedwater preheating system in power plant (CCPP), it includes：FWPH and evaporator；Water separative element, the water separative element connects
It is connected to the evaporator and the FWPH；FWPH suction lines, the FWPH suction lines be used for condenser and the FWPH it
Between connection；FWPH outlet lines, the connection that the FWPH outlet lines are used between the FWPH and the evaporator；Bypass
Connecting pipeline, the bypass connecting pipe line is between the FWPH suction lines and the FWPH outlet lines；By-pass governing
Valve, the bypass control valve (BCV) is used to control by the bypass connecting pipe line to current；For monitoring the water separative element
The LP temperature difference (Δ T) device；Control system, the control system is constructed and arranged to control the bypass control valve (BCV)
And the least partially open bypass control valve (BCV) when the LP temperature difference drops below setting value.The equipment can be improved
Plant efficiency and power output.
In one embodiment, include for monitoring the device of the LP temperature difference：Sensor, it is used to measure the FWPH outlets
Temperature in pipeline；And sensor, it is used for the temperature for measuring the steam in the water separative element, and for monitoring LP temperature
The device of difference is constructed and arranged to based on the steaming in the temperature in the FWPH outlet lines and the water separative element
The temperature of vapour monitors the LP temperature difference.Preferably, for the sensor for the temperature for measuring the steam in the water separative element
In evaporator outlet pipeline.
In another embodiment, the bypass control valve (BCV) is the triple valve on the FWPH suction lines.
In another embodiment, the feedwater preheating system also includes recirculation pump, and the recirculation pump is attached at
On pipeline between the point in the FWPH suction lines downstream and the FWPH suction lines.This can provide further efficiency
Gain, and when using sulfurous fuels sulphur can be avoided to be condensate on FWPH.
In another embodiment, at least one of described sensor is resistance temperature detector (RTD).It is preferred that
Ground, each sensor includes three RTD.This can improve measurement accuracy, and multiple RTD can also provide the redundancy of part
Degree, so as to also can continue to be operated in the case of one or more sensor failures.
In another embodiment, the water separative element is LP drums, and the LP drums are in the FWPH and the evaporator
Between be plugged on the FWPH outlet lines.
According to the third aspect of the present invention there is provided a kind of combined cycle power plant, it includes above-mentioned feedwater preheating system
One of system.
Brief description of the drawings
Referring now to accompanying drawing, embodiments of the invention are described by only example, wherein：
Fig. 1 shows the feedwater preheating system according to the present invention；
Fig. 2 shows alternative feedwater preheating system according to the present invention；And
Fig. 3 shows alternative feedwater preheating system according to the present invention, and (Resistance Temperature is detected wherein RTD
Device) it is used for monitoring temperature.
Embodiment
Fig. 1 shows the feedwater preheating of the heat recovery steam generator (HRSG) 12 for combined cycle power plant (CCPP)
System 10.System surrounds feedwater pre-heater (FWPH) 14 and evaporator 16 (being in this example low pressure evaporator).Evaporation
Device suction line 48 and evaporator outlet pipeline 50 lead to evaporator and extended from evaporator.FWPH suction lines 18 are used to condense
Connection between device (not shown) and feedwater pre-heater 14, the water supply pre-heater 14 of FWPH outlet lines 20 and water separation
Connection between unit, in this example embodiment, water separative element are low pressure (LP) drum 22.Bypass connecting pipe line 24 is exported for FWPH
Connection between pipeline 20 and FWPH suction lines 18, bypass control valve (BCV) (CV) (being in this case three-way control valve 26) is set
Put at the tie point between FWPH outlet lines 20 and FWPH suction lines 18.
Optionally, recirculation pump 30 (in this example embodiment including pump, check-valves and control valve) is connected to from feedwater pre-add
The tapping point in the exit of hot device to feedwater pre-heater porch point pipeline on.
In this example embodiment, water temperature sensor T1 and the saturation degree temperature sensor Tsat (saturated vapors in measurement LP drums
Temperature), water temperature sensor T1 is arranged on FWPH outlet lines 20.Saturation degree temperature sensor Tsat, which is arranged on from LP drums, to be prolonged
On the steam pipe line 34 for reaching low-pressure superheater (LPSH).Control system (not shown) can be based on the defeated of sensor T1 and Tsat
The control valve 26 is out controlled, the difference between the two outputs is referred to as the LP temperature difference.More formally, the LP temperature difference is to leave satisfying for LP drums
Temperature difference (Δ T) between the water of steam and entrance LP drums.
Another control valve 32 (LP rouses control valve) for controlling LP to rouse water level is arranged on FWPH outlet lines 20.
By the control of the control valve in recirculation pump 30, some feedwater of the heating passed through along FWPH outlet lines 20
FWPH suction lines 18 are may return to, it then again passes through FWPH herein.This can for increase FWPH porch
Feedwater temperature.
Fig. 2 shows alternative feedwater preheating system, and many parts are as described in Figure 1.In fig. 2, it is provided with
Feed water pre-heater 14, and the tapping point of recirculation pump 30 is connected to pipeline 41 between FWPH two parts.
Three-way control valve 26 is not used, and Fig. 2 embodiment provides (two-way) control valve 40.This is on bypass connecting pipe line 24
It is arranged between condenser (not shown) and FWPH outlet lines 20.
Control system 42 is shown in Fig. 2.Water temperature sensor T is equal to the water temperature sensor T1 in Fig. 1, and pressure is passed
Sensor P is used for obtaining saturation degree temperature (replacing the saturation degree temperature sensor Tsat in Fig. 1).It also show control unit 44；
The control unit monitors pressure sensor P and water temperature sensor T, and based on these input adjusting control valves 40.Carry below
For the further details of the application method of the system described in Fig. 1 and 2.
A kind of selection for measuring the LP temperature difference is that the temperature of feedwater is measured using thermocouple (at T, T1), and is counted
The saturation degree temperature (Tsat, P) with the pressure correlation of measurement is calculated to measure bulging temperature.Another selection is as shown in Figure 3.In order to
The inlet temperature of LP drums is measured, before LP drums, three resistance temperature detectors are provided with FWPH outlet lines 20
(RTD).In order to obtain temperature, these three devices are averaged.In order to measure LP drum vapor (steam) temperatures, three RTD are arranged on from steaming
Hair device is returned on the evaporator outlet pipeline 50 for extending to LP drums (such as in the return header of flash-pot is carried out), and again
Take three RTD mean temperature.
Multiple RTD advantage is, in the case of an even two RTD failures, remains able to measurement temperature, and
System can continue to operation.In this case, the precision that the LP temperature difference may be read due to temperature is reduced and increased.
Pressure sensor P input can be also used for control unit 44, be used as the intersection for temperature and/or Stress control
Check.
In the application method of equipment shown in the drawings, feedwater enters from condenser (not shown).Feedwater enters along FWPH
Mouth pipeline 18 enters FWPH14 through three-way control valve 26.In FWPH14, it passes through the waste gas stream in HRSG12
Heat transfer and be heated.Then, the feedwater of heating enters LP drums along FWPH outlet lines 20 through control valve 32.From LP
Drum, steam is delivered to LPSH (not shown) along steam pipe line 34.Any water in LP drums is entered by evaporator inlet pipeline 48
Evaporator 16 is given to, water is heated with the heat transfer of the stream in HRSG12, further to produce steam, the steam is via evaporator
Outlet line 50 is fed into LP drums.
The LP temperature difference can be monitored using water temperature sensor T1 and saturation degree temperature sensor Tsat.The LP temperature difference is to enter LP
The temperature difference (Δ T) between saturation degree temperature under bulging feedwater and drum pressure, wherein feed temperature has relatively low value.It is based on
The LP temperature difference temperature, changes bypass CV state.If the LP temperature difference drops below setting value (i.e. the minimum LP temperature difference), then other
Logical CV (the threeway CV26 in Fig. 1) will be opened and be sprayed cold water, to reduce the temperature T1 in FWPH outlet lines 20.The setting value
It is less than 5K, is preferably less than 2K and more preferably less than 1K the LP temperature difference.
Control temperature T1 reduce LP drum control valve 32 in flashing risk, even in few fractional load (low load or
Extremely low load) operation during.
Preferably, the LP temperature difference (such as monitoring per second is once) is constantly monitored.In the case where continuing to monitor, with work as
When condition changes, thus it is possible to vary the amount that bypass CV is opened.
The monitoring of the LP temperature difference be valuable situation example include turbine load change during, and fractional load phase
Between, during especially few fractional load.In the case of fractional load, heat is transferred to the cold of boiler (being in this example embodiment HRSG)
End, therefore bypass control valve (BCV) need not be adjusted to allow more water to pass through bypass connecting pipe line, at this compared with normal condition
Under normal circumstances, the LP temperature difference will generally decline and will appear from flashing in LP rouses control valve.
The embodiment of feedwater preheating system 10 described in accompanying drawing can be incorporated into combustion gas turbine systems.Specifically,
They can be incorporated into the system of steamturbine upstream.Shown example is in the upstream of low-pressure steam turbine, but feeds water
Preheating system can be used for medium or high pressure steamturbine.In the downstream of water separative element, feedwater preheating system can
To be fed into superheater (SH) or be fed directly into steamturbine (ST).
In order to more heat feedwater, HRSG12 can have the bigger table than being set in water supply system before this
Face (bigger area of heat transfer).
Bypass connecting pipe line 24 is connected to FWPH outlet lines 20 an end.Bypass connecting pipe line can be connected to
At any point between FWPH outlet and water separative element inlet temperature sensor.In another end, bypass connecting pipe
FWPH suction lines are connected at any that line can be between condenser and FWPH.Although recirculation pump is being illustrated as
Connect into than bypass connecting pipe line closer to FWPH, but bypass connecting pipe line can be in one or two end than recycling
Pump line line closer to.With control valve (such as control valve 26,40), to control the current in bypass connecting pipe line.Shown in Fig. 2
Control valve can be used for the embodiment shown in Fig. 1 and 3, and Fig. 1 and 3 control valve can be used for Fig. 2 embodiment.
Temperature sensor may be positioned so that the entrance being connected close to FWPH suction lines with FWPH.The Sensor monitoring
FWPH entrance streams.In embodiment of the fuel comprising sulphur (such as during oil or fuel gas operation), FWPH entrance streams temperature should
When preferably keeping higher, ideally higher than the condensation temperature of sulphur, to minimize or avoid sulphur from being deposited on FWPH outside.Can
With the output control recirculation pump 30 based on the temperature sensor, the feed-water intake temperature for FWPH is kept above setting
Value.Setting value can be the condensation temperature of sulphur.
Alternatively or additionally, the bypass connecting pipe line stream controlled by control valve can enter according to FWPH
Mouthful (HRSG entrances, FWPH enter HRSG point) place temperature and change.Setting value is fallen below at a temperature of FWPH entrances
When (such as the condensation temperature of sulphur), some the feedwater streams for carrying out condenser are changed its course by bypass connecting pipe line.Which reduce pass through
FWPH's gives current.Again, when needing high FWPH inlet temperatures this method can be used, such as to relax asking for sulphur condensation
Topic.If the feedwater provided by bypass connecting pipe line mean enter LP rouse water it is not hot enough, then LP steam produce and/or
Extra steam (start and stop reserve steam) can for increase water temperature.In addition, steam condenser, condensate heat exchanger,
Live (open) steam, which injects (DSI) or electric heater, to increase the temperature of LP feedwater for being fed into taking a step forward for HRSG in water.
Recirculation pump 30 can connect (tap) and (namely go out in the downstream (such as Fig. 1) of feedwater pre-heater in FWPH
After mouthful, i.e. FWPH leaves HRSG point), or it can also be partially by feedwater pre-heater connection (such as Fig. 2).
There is tap (intermediate tap) (upstream of last feedwater pre-heater outlet, when setting in the feed water upstream of pre-heater outlet
When having multiple feedwater pre-heaters) in the case of, compared with carrying out tap in feedwater pre-heater exit or downstream, relatively
The pre-add hot water of the lower temperature of high quality stream is recycled.Then, the remaining water in tapping point downstream is heated to than not having
The situation that water is recycled higher temperature relatively, this provides preferably efficiency (due to less available energy loss), and
It is more easily controlled HRSG flue gases and leaves temperature.It can be provided for flashing steam and (thus be accordingly used in LP steamturbines in addition
Steam) and/or for the pre-warmed higher feedwater Extracting temperature of gas turbine air.
Control valve 32 is arranged between bypass line and water separative element on FWPH outlet lines.LP CV32, LP rouse and
Pipeline between them may be designed to be used for flashing situation, for example by using hardening steel making they.This is possible into one
Step improves efficiency (the further reduction LP temperature difference), and reason is that infringement of the flashing to these parts is smaller.Alternatively select
Select, flashing hardened component can be used as acknowledgment copy so that these parts are caused due to temperature survey or control element failure
Resist and damage in the case of flashing.
Saturation degree temperature sensor Tsat can be pressure sensor, and wherein steam reference table is with coming by calculation of pressure temperature
Degree.
In figure 3, three RTD are illustrated on evaporator outlet pipeline, but they can also be arranged on steam pipe
On line (LP outlet lines) or LP drums, as shown in the sensor in Fig. 1 and 2.Similarly, in the sensor Tsat and Fig. 2 in Fig. 1
Sensor P can be arranged on evaporator outlet pipeline, rouse exit in LP, or in LP drums more than water level.These steam
Stripping temperature measurement sensor be placed on they only measure LP drum in steam temperature without directly being roused by LP in water temperature
In the position of the influence of degree.
In figure 3, for measurement every time, three RTD are used for higher precision, but can generally use one or more
RTD, the quantity used is for example depending on cost consideration and required precision level.
The degassing of feedwater can be performed in condenser (such as water-cooled condenser), and/or can be performed in LP drums de-
Gas.Setting value can be adjusted, to allow the degassing that enough LP temperature difference are used for during LP is roused.This provides extra degassing energy
Power.
In the case where not departing from the present invention being defined by the following claims, those skilled in the art can be to described
Embodiment carry out various modifications.
Reference
10 combined cycle power plants (CCPP)
12 heat recovery steam generators (HRSG)
14 feedwater pre-heaters (FWPH)
16 evaporators
18 FWPH suction lines (water-supply line)
20 FWPH outlet lines (outlet line)
22 low pressure (LP) drum
24 bypass connecting pipe lines
26 bypass control valve (BCV)s
30 recirculation pumps
32 control valves (LP rouses control valve)
34 steam pipe lines
40 control valves
41 pipelines
42 control systems
44 control units
48 evaporator inlet pipelines (suction line)
50 evaporator outlet pipelines (outlet line)
P pressure sensors
T water temperature sensors
T1 water temperature sensors
Tsat saturation degree temperature sensors
LP evaporators=low pressure evaporator
LPCV=low-pressure control valves
LPST=low-pressure steam turbines
LPSH=low-pressure superheaters
FWPH=feedwater pre-heaters
HRSG=heat recovery steam generators
CCPP=combined cycle gas turbines
RTD=resistance temperature detectors
Claims (15)
1. one kind operates the method for the feedwater preheating system (10) for heat recovery steam generator (HRSG, 12), the feedwater
Preheating system includes water separative element (22), evaporator (16) and feedwater pre-heater (FWPH, 14), the feedwater preheating
Device is attached to FWPH suction lines (18) and FWPH outlet lines (20), and methods described includes：
Water is fed into the FWPH (14) from condenser along the FWPH suction lines (18),
The heating water in the FWPH (14),
Water is fed into the evaporator (16) from the FWPH (14) along FWPH outlet lines (20),
Make boiling water in the evaporator (16), and the mixture of resulting steam and water is fed into the water separation
Unit (22),
The LP temperature difference (Δ T) of the water separative element (22) is monitored,
The setting value of the LP temperature difference is set,
When the LP temperature difference is less than the setting value, some water are bypassed into the FWPH (14) from the FWPH suction lines
(18) the FWPH outlet lines (20) are directed to.
2. according to the method described in claim 1, it is characterised in that separate list by monitoring water separative element inlet temperature and water
First outlet temperature, to monitor the LP temperature difference.
3. method according to claim 2, it is characterised in that surveyed using at least one resistance temperature detector (RTD)
Measure at least one of the water separative element inlet temperature and the water separative element outlet temperature.
4. according to the method described in claim 1, it is characterised in that the setting value is less than 5K, preferably less than 2K, most preferably
Ground is less than 1K.
5. according to any method of the preceding claims, it is characterised in that the FWPH (14) includes FWPH entrances,
Methods described is further comprising the steps of：
FWPH inlet temperatures are monitored, and
When the FWPH inlet temperatures are less than setting value, the downstream of water from the FWPH entrances is recycled to the FWPH and enter
Mouthful, and/or guide some water to bypass the FWPH (14).
6. method according to claim 5, it is characterised in that the FWPH (14) comprises additionally in FWPH outlets, and makes
Water is recycled from the FWPH upstreams exported.
7. method according to any one of claim 1 to 6, it is characterised in that the water separative element is LP drums, from institute
Stating FWPH (14) and entering feedwater includes：Water is fed into the LP drums (22), the evaporator (16) is then fed into.
8. feedwater preheating system of the one kind for the heat recovery steam generator (HRSG, 12) of combined cycle power plant (CCPP)
(10), it includes：
Feed water pre-heater (FWPH, 14) and evaporator (16),
Water separative element (22), the water separative element is connected to the evaporator (16) and the FWPH (14),
FWPH suction lines (18), the connection that the FWPH suction lines are used between condenser and the FWPH (14),
FWPH outlet lines (20), the company that the FWPH outlet lines are used between the FWPH (14) and the evaporator (16)
Connect,
Bypass connecting pipe line (24), the bypass connecting pipe line is in the FWPH suction lines (18) and the FWPH outlets
Between line (20),
Control valve (32), the control valve is in the FWPH outlet lines (20) in the downstream of the bypass connecting pipe line (24)
On,
Bypass control valve (BCV) (26), the bypass control valve (BCV) is used to control by the bypass connecting pipe line (24) to current,
For the device for the LP temperature difference (Δ T) for monitoring the water separative element (22),
Control system, the control system is constructed and arranged to control the bypass control valve (BCV) (26) and in the LP
The temperature difference drops below the least partially open bypass control valve (BCV) (26) during setting value.
9. feedwater preheating system (10) according to claim 8, it is characterised in that the device bag for monitoring the LP temperature difference
Include：
Sensor (T1, T, RTD), it is used to measure the temperature in the FWPH outlet lines (20), and
Sensor (Tsat, P, RTD), it is used for the temperature for measuring the steam in the water separative element (22), and
For monitor the device of the LP temperature difference be constructed and arranged to based on the temperature in the FWPH outlet lines (20) and
The temperature of steam in the water separative element (22) monitors the LP temperature difference.
10. feedwater preheating system according to claim 9, it is characterised in that for measuring the water separative element
(22) sensor (RTD) of the temperature of the steam in is in evaporator outlet pipeline (50).
11. the feedwater preheating system (10) according to any one of claim 8 to 10, it is characterised in that the bypass
Control valve is the triple valve (26) on the FWPH suction lines (18).
12. feedwater preheating system (10) according to claim 8, it is characterised in that the feedwater preheating system is also
Including recirculation pump (30), the recirculation pump is attached at the point and the FWPH entrances in FWPH suction lines (20) downstream
On pipeline between pipeline (18).
13. the feedwater preheating system (10) according to any one of claim 9 to 12, it is characterised in that the sensing
At least one of device is resistance temperature detector (RTD).
14. feedwater preheating system (10) according to claim 13, it is characterised in that each in the sensor
Sensor includes three RTD.
15. a kind of combined cycle power plant, it includes the feedwater preheating system according to any one of claim 8 to 14
(10)。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14199167.9 | 2014-12-19 | ||
| EP14199167 | 2014-12-19 | ||
| PCT/EP2015/079779 WO2016096847A1 (en) | 2014-12-19 | 2015-12-15 | System and method for fluid medium preheating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107110488A true CN107110488A (en) | 2017-08-29 |
| CN107110488B CN107110488B (en) | 2020-10-16 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580069782.7A Active CN107110488B (en) | 2014-12-19 | 2015-12-15 | Feed water preheating system bypass |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107110488B (en) |
| WO (1) | WO2016096847A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6730195B2 (en) | 2014-04-28 | 2020-07-29 | ゼネラル エレクトリック テクノロジー ゲゼルシャフト ミット ベシュレンクテル ハフツングＧｅｎｅｒａｌ Ｅｌｅｃｔｒｉｃ Ｔｅｃｈｎｏｌｏｇｙ ＧｍｂＨ | Fluid medium preheating system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2099558A (en) * | 1981-05-26 | 1982-12-08 | Gen Electric | Heat recovery steam generator |
| WO2010054934A2 (en) * | 2008-11-13 | 2010-05-20 | Siemens Aktiengesellschaft | Method for operating a waste heat steam generator |
| CN102016411A (en) * | 2007-03-22 | 2011-04-13 | 努特-艾瑞克森公司 | High efficiency feedwater heater |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3910236A (en) * | 1974-10-10 | 1975-10-07 | Applied Eng Co | Economizer for steam boiler |
| EP0931978B1 (en) * | 1998-01-21 | 2003-12-03 | ALSTOM (Switzerland) Ltd | Process for preventing steaming in a forced circulation steam generator |
| DE19926326A1 (en) * | 1999-06-09 | 2000-12-14 | Abb Alstom Power Ch Ag | Process and plant for heating a liquid medium |
| US6460490B1 (en) * | 2001-12-20 | 2002-10-08 | The United States Of America As Represented By The Secretary Of The Navy | Flow control system for a forced recirculation boiler |
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2015
- 2015-12-15 WO PCT/EP2015/079779 patent/WO2016096847A1/en active Application Filing
- 2015-12-15 CN CN201580069782.7A patent/CN107110488B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2099558A (en) * | 1981-05-26 | 1982-12-08 | Gen Electric | Heat recovery steam generator |
| CN102016411A (en) * | 2007-03-22 | 2011-04-13 | 努特-艾瑞克森公司 | High efficiency feedwater heater |
| WO2010054934A2 (en) * | 2008-11-13 | 2010-05-20 | Siemens Aktiengesellschaft | Method for operating a waste heat steam generator |
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| 包伟业: "《动力工程概论》", 31 August 1994, 上海交通大学出版社 * |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107110488B (en) | 2020-10-16 |
| WO2016096847A1 (en) | 2016-06-23 |
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