CN106917780B - Multistage steam injecting type pumped vacuum systems and its adjusting method - Google Patents
Multistage steam injecting type pumped vacuum systems and its adjusting method Download PDFInfo
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- CN106917780B CN106917780B CN201710157814.XA CN201710157814A CN106917780B CN 106917780 B CN106917780 B CN 106917780B CN 201710157814 A CN201710157814 A CN 201710157814A CN 106917780 B CN106917780 B CN 106917780B
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
- F04F5/22—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating of multi-stage type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/48—Control
- F04F5/52—Control of evacuating pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
Abstract
The present invention provides a kind of multistage steam injecting type pumped vacuum systems and its adjusting method, and multistage steam injector, steam buffer tank, steam condenser and the valves and fittings for connecting relevant apparatus are included in this system.Multistage steam injector uses adjustable+fixed combination, and power steam is drawn gas using power plant's main frame, and cooler cooling water uses opened water or main frame condensate, cooler drain recovery to hot well.This set system can automatically adjust adjustable steam ejector according to the economy of main frame, realize adaptive when the dosage of power steam changes with outer work condition, reduce the power steam dosage under the conditions of full working scope, improve the economy of pumped vacuum systems.
Description
Technical field
The present invention relates to power plant unit pumped vacuum systems, more particularly, to multistage steam injecting type pumped vacuum systems and its
Adjusting method.
Background technology
One of the Important Auxiliary equipment of pumped vacuum systems as power plant, its main function is during unit starting, coagulates cold end
Vapour device establishes rapidly vacuum, and, it is able to maintain that condenser inner vacuum. in unit during normal operation.Power plant is conventional at present takes out
Vacuum equipment is water-ring vacuum pump, is easily influenceed in the operation of this complete equipment by working solution temperature, not only constrains exhaust capacity,
And cavitation easily occurs, cause blade to crack or be broken, influence unit operation safety, add repair and maintenance expense.
The characteristics of additionally, due to vavuum pump itself, its operating efficiency when maintaining unit vacuum are also relatively low.Application No.
The vacuum that 201520433961.1 Chinese patent discloses a kind of fired power generating unit keeps system, and its nucleus equipment is that liquid-ring type is true
The tandem compound of empty pump+lobe pump, system solves the problem the problem of Water-ring vacuum pump cavitation, also improve take out to a certain extent
The efficiency of vacuum system, but aspirate humid air and easily cause the failures such as the emulsification of lobe pump, internal corrosion, rotation is added in addition to be set
Standby, maintenance workload is big.The Chinese patent of Application No. 201420174151.4 discloses one kind using steam jet ejector as core component
Pumped vacuum systems, one-level is employed in the system and starts injector as the vacuum of establishing during unit starting, three steam
Injector is by two-stage series connection maintaining the high and low condenser vacuum of unit.The system avoids by using steam jet ejector
The problem of Water-ring vacuum pump cavitation, it ensure that the security under the conditions of unit operation.But under the conditions of current unit back pressuce, two level
Steam jet ejector series efficiency deviation, and using fixed steam jet ejector combination off-design point in the variable working condition of unit
Operation, causes that power steam dosage is bigger than normal, and efficiency is poor, the working range of injector is deviateed when serious, pumped vacuum systems can not
Normal work.
To sum up, subject matter present in prior art is：
1st, water ring vacuum pump pumped vacuum systems noise is big, the easy cavitation of the pump housing, and maintenance workload is big；
2nd, lobe pump working environment is severe, and emulsification and internal corrosion easily occurs under the conditions of pump housing suction humid air；
3rd, the operational efficiency of the pumped vacuum systems under the conditions of current steam jet ejector pumped vacuum systems variable working condition is low, power
Steam consumption quantity is big.
The content of the invention
In order to solve above mentioned problem of the prior art, the invention provides a kind of multistage steam injecting type pumped vacuum systems
And its adjusting method.Using the system, can solve problems with：
1st, in such a system because injector belongs to the mechanical part of no rotation, thus it is easy to maintenance.
2nd, this system consumption greatly reduces the power consumption of pumped vacuum systems.
3rd, under the conditions of variable working condition, realized and be self-regulated by control module, vacuum system is in all the time under efficient operating mode and transport
OK, power steam consumption is saved.
Therefore, the present invention a kind of new pumped vacuum systems and control method, the system are primarily adapted for use in in-service at present
Unit vacuumizes transformation project, the vacuum keeping apparatus after being established for main frame vacuum, standby each other with former vacuum system；It is special
Sign is：
The system mainly includes steam buffer tank (2), attemperator (19), adjustable steam ejector I (3), adjustable
Steam jet ejector II (4), fixed steam jet ejector (5), match with steam jet ejector three steam cooling devices (6,7,
8), draining system uses the U-shaped water seal of single-stage (9,10) and multi-stage U-shaped water seal (11), and the valve and pipe of connection apparatus above
Part；
When systems are functioning properly, its specific workflow is that main frame draws gas by (2) voltage stabilizing of steam buffer tank and passed through
After desuperheater spray desuperheat, adjustable steam ejector I (3), adjustable steam ejector II are respectively enterd as power steam
(4), fixed steam jet ejector (5), three steam jet ejectors are the relations of series connection, and adjustable steam ejector I is directly with coagulating
Vapour device (1) connects, and it is cold to enter first order cooling device (6) progress for incondensable gas in suction condenser after being mixed with power steam
But, adjustable steam ejector II is connected with first order cooling device, is aspirated after its interior incondensable gas mixes with power steam
Into second level cooling device (7), last fixed steam jet ejector again aspirates incondensable gas in the condensing unit of the second level
Out it is sent into third level cooling device (8) to be cooled down, sufficiently cool rear incondensable gas is discharged in air；
During unit starting, exhaust steam inlet valve I (14) is closed, opens exhaust steam inlet valve II (15), former vacuum system starts fortune
OK, after unit establishes vacuum, exhaust steam inlet valve II is closed, exhaust steam inlet valve I, power steam inlet valve (13), power is opened and steams
Steam control valve (12), cooling water system is put into, closes original vacuum system, steam jet ejector pumped vacuum systems puts into operation；
This set pumped vacuum systems is using adjustable steam ejector+fixed steam jet ejector combination, adjustable steam spray
Emitter I, the aperture of the actuator of adjustable steam ejector II are adjusted when being changed according to unit back pressuce by control module.
According to pumped vacuum systems of the present invention, it is characterised in that：Every grade of the hydrophobic of cooling device uses the U-shaped water of single-stage
Envelope.
According to pumped vacuum systems of the present invention, it is characterised in that：Every grade of cooling device it is hydrophobic using drain valve or
Person's multi-stage U-shaped water seal.
According to pumped vacuum systems of the present invention, it is characterised in that：
During unit normal operation, power steam is taken main frame and drawn gas, and ensures steam after steam buffer tank (2) desuperheat voltage stabilizing
Pressure value=0.3~0.8MPa (abs.), temperature overheating degree=10~20 DEG C；Installed on power steam surge tank (2) body
There is a pressure transmitter (17), attemperator (18), thermal resistance (19), pressure transmitter detected value acts on power by control module
Steam control valve (12), thermal resistance detected value act on Desuperheating water regulating valve (20) by control module, it is ensured that steam jet ejector
Power steam inlet pressure, temperature are without departing from design load.
Present invention also offers a kind of adjusting method of described pumped vacuum systems, it is characterised in that：
After system is put into, condenser pressure is in P0≤P2, and during min, system uses the combination of three-level injector series connection
Mode, exhaust steam inlet valve II, exhaust steam inlet valve III are closed, open exhaust steam inlet valve I, three steam jet ejectors put into operation；
When being fluctuated within this range with condenser pressure, holding for adjustable steam ejector I is adjusted by control module
Row mechanism, when certain moment, back pressure Pt increased to (1+a) P0, the theoretical coefficient of heat transfer and the actual coefficient of heat transfer are calculated, is judged whether
Meet, when meeting this condition, the executing agency aperture increase m of control module regulation adjustable steam ejector I, P0 are reset to
The back pressure Pt at this moment；If not satisfied, maintain executing agency's aperture of adjustable steam ejector I constant, while P0 is reset to
The back pressure Pt at this moment；
When certain moment, back pressure Pt was reduced to (1-a) P0, control module adjusts the executing agency of adjustable steam ejector I
Aperture reduces n, while P0 resets to the back pressure Pt at this moment；
When condenser pressure is in P0 ＞ P2, min, system uses the combination of two-stage level injector series connection, closes dynamic
Power steam inlet valve (13), exhaust steam inlet valve II, exhaust steam inlet valve III, exhaust steam inlet valve I are opened, makes what is be sucked in condenser
Non-condensable gas is directly entered adjustable steam ejector II, adjustable steam ejector I after the cooling of first order cooling device
It is stopped, when being fluctuated with condenser pressure in the range of P2, adjustable steam ejector II is adjusted by control module
Executing agency.When certain moment, back pressure Pt increased to (1+a) P0, theoretical coefficient of heat transfer K' and actual coefficient of heat transfer K are calculated, is judged
Whether meet, when meeting this condition, executing agency aperture the increase m, P0 of control module regulation adjustable steam ejector II
Reset to the back pressure Pt at this moment；If not satisfied, maintain executing agency's aperture of adjustable steam ejector II constant, while P0
Reset to the back pressure Pt at this moment；When certain moment, back pressure Pt was reduced to (1-a) P0, control module regulation adjustable steam injection
Executing agency's aperture of device II reduces n, while P0 resets to the back pressure Pt at this moment；
P0 is the back pressure value of initial time condenser defined in it, and Pt is the back pressure value of t condenser, and m, n are adjustable
Formula steam jet ejector executing agency acts the size of aperture every time, and a, b are t back pressure of condenser Pt compared with initial backpressure P0
Deviation ratio, and meet following formula：
C is t theory coefficient of heat transfer K' and actual coefficient of heat transfer K deviation ratio, and meets following formula：
K', K calculating should meet following equation：
K'=K0f(β,βw,βt,βz,βd)
In formula：The theoretical coefficient of heat transfer of K'-calculating, K0- basic the coefficient of heat transfer, β-consideration cooling surface clean condition
With condensation tube material and the coefficient of wall thickness, βw,βt,βz,βd- consider cooling medium flow velocity, coolant temperature, cooling medium stream
The correction factor of the influences such as number of passes, steam load rate；The coefficient of heat transfer for K-actually calculate, h "-steam discharge enthalpy, hs- hydrophobic enthalpy
Value, A- heat exchange areas, Δ tm- mean temperature difference；
During system fading margin, meet formula：0 ＜ a≤0.1,0 ＜ b≤0.1,0 ＜ n≤m≤5%, 0 ＜ c≤min (a, b)
P1 is defined, maximum suction pressure when max is I normal work of adjustable steam ejector, P2, min are adjustable
Minimum suction pressure during formula II normal work of steam jet ejector, and meet P2, min ＜ P1, max.
Relative to prior art, present invention obtains advantages below：
1st, easy maintenance；
2nd, power consumption is low；
3rd, noise is low, and suction capactity is stable；
4th, can good conformity main frame operating mode change, there is good energy-saving benefit.
Brief description of the drawings
Fig. 1 is the schematic diagram of the system of the present invention；
Fig. 2 is adjustable nozzle aperture regulation logical schematic
In figure, 1- main frame condensers；2- steam buffer tanks；3- adjustable steam ejectors I；4- adjustable steam ejectors
Ⅱ；The fixed steam jet ejectors of 5-；6- first order cooling devices；7- second level cooling device；8- third level cooling devices；9-U
Type water seal I；10-U types water seal II；11- multi-stage U-shaped water seals；12- power steam regulating valves；13- power steam inlet valves；14- is weary
Vapour inlet valve I；15- exhaust steam inlet valve II；16- exhaust steam inlet valve III；17- pressure transmitters；18- thermal resistances；19- attemperators；
20- Desuperheating water regulating valves.The initial back pressure of condenser of P0-, Pt-t moment back pressure of condenser, a, b- unit back pressuce variable quantities, c- are changed
Hot index variation amount, m, n- actuator aperture variable quantities, the K '-theoretical coefficient of heat transfer, the actual coefficients of heat transfer of K-, Y- meet condition,
N- is unsatisfactory for condition, minimum suction pressure when P2, min-II normal work of adjustable steam ejector.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, and the invention provides a kind of multistage steam injecting type to take out
Vacuum system and its adjusting method.Using the system, can solve problems with：
1st, in such a system because injector belongs to the mechanical part of no rotation, thus it is easy to maintenance.
2nd, this system consumption greatly reduces the power consumption of pumped vacuum systems.
3rd, under the conditions of variable working condition, realized and be self-regulated by control module, vacuum system is in all the time under efficient operating mode and transport
OK, power steam consumption is saved.
Therefore, the present invention a kind of new pumped vacuum systems and control method, the system are primarily adapted for use in in-service at present
Unit vacuumizes transformation project, the vacuum keeping apparatus after being established for main frame vacuum, standby each other with former vacuum system；It is special
Sign is：
The system mainly includes steam buffer tank (2), attemperator (19), adjustable steam ejector I (3), adjustable
Steam jet ejector II (4), fixed steam jet ejector (5), match with steam jet ejector three steam cooling devices (6,7,
8), draining system uses the U-shaped water seal of single-stage (9,10) and multi-stage U-shaped water seal (11), and the valve and pipe of connection apparatus above
Part；
When systems are functioning properly, its specific workflow is that main frame draws gas by (2) voltage stabilizing of steam buffer tank and passed through
After desuperheater spray desuperheat, adjustable steam ejector I (3), adjustable steam ejector II are respectively enterd as power steam
(4), fixed steam jet ejector (5), three steam jet ejectors are the relations of series connection, and adjustable steam ejector I is directly with coagulating
Vapour device (1) connects, and it is cold to enter first order cooling device (6) progress for incondensable gas in suction condenser after being mixed with power steam
But, adjustable steam ejector II is connected with first order cooling device, is aspirated after its interior incondensable gas mixes with power steam
Into second level cooling device (7), last fixed steam jet ejector again aspirates incondensable gas in the condensing unit of the second level
Out it is sent into third level cooling device (8) to be cooled down, sufficiently cool rear incondensable gas is discharged in air；
During unit starting, exhaust steam inlet valve I (14) is closed, opens exhaust steam inlet valve II (15), former vacuum system starts fortune
OK, after unit establishes vacuum, exhaust steam inlet valve II is closed, exhaust steam inlet valve I, power steam inlet valve (13), power is opened and steams
Steam control valve (12), cooling water system is put into, closes original vacuum system, steam jet ejector pumped vacuum systems puts into operation；
This set pumped vacuum systems is using adjustable steam ejector+fixed steam jet ejector combination, adjustable steam spray
Emitter I, the aperture of the actuator of adjustable steam ejector II are adjusted when being changed according to unit back pressuce by control module.
According to pumped vacuum systems of the present invention, it is characterised in that：Every grade of the hydrophobic of cooling device uses the U-shaped water of single-stage
Envelope.
According to pumped vacuum systems of the present invention, it is characterised in that：Every grade of cooling device it is hydrophobic using drain valve or
Person's multi-stage U-shaped water seal.
According to pumped vacuum systems of the present invention, it is characterised in that：
During unit normal operation, power steam is taken main frame and drawn gas, and ensures steam after steam buffer tank (2) desuperheat voltage stabilizing
Pressure value=0.3~0.8MPa (abs.), temperature overheating degree=10~20 DEG C；Installed on power steam surge tank (2) body
There is a pressure transmitter (17), attemperator (18), thermal resistance (19), pressure transmitter detected value acts on power by control module
Steam control valve (12), thermal resistance detected value act on Desuperheating water regulating valve (20) by control module, it is ensured that steam jet ejector
Power steam inlet pressure, temperature are without departing from design load.
Present invention also offers a kind of adjusting method of described pumped vacuum systems, it is characterised in that：
After system is put into, condenser pressure is in P0≤P2, and during min, system uses the combination of three-level injector series connection
Mode, exhaust steam inlet valve II, exhaust steam inlet valve III are closed, open exhaust steam inlet valve I, three steam jet ejectors put into operation；
When being fluctuated within this range with condenser pressure, holding for adjustable steam ejector I is adjusted by control module
Row mechanism, when certain moment, back pressure Pt increased to (1+a) P0, the theoretical coefficient of heat transfer and the actual coefficient of heat transfer are calculated, is judged whether
Meet, when meeting this condition, the executing agency aperture increase m of control module regulation adjustable steam ejector I, P0 are reset to
The back pressure Pt at this moment；If not satisfied, maintain executing agency's aperture of adjustable steam ejector I constant, while P0 is reset to
The back pressure Pt at this moment；
When certain moment, back pressure Pt was reduced to (1-a) P0, control module adjusts the executing agency of adjustable steam ejector I
Aperture reduces n, while P0 resets to the back pressure Pt at this moment；
When condenser pressure is in P0 ＞ P2, min, system uses the combination of two-stage level injector series connection, closes dynamic
Power steam inlet valve (13), exhaust steam inlet valve II, exhaust steam inlet valve III, exhaust steam inlet valve I are opened, makes what is be sucked in condenser
Non-condensable gas is directly entered adjustable steam ejector II, adjustable steam ejector I after the cooling of first order cooling device
It is stopped, when being fluctuated with condenser pressure in the range of P2, adjustable steam ejector II is adjusted by control module
Executing agency.When certain moment, back pressure Pt increased to (1+a) P0, the theoretical coefficient of heat transfer and the actual coefficient of heat transfer are calculated, judgement is
No satisfaction, when meeting this condition, executing agency's aperture increase m, P0 weight of control module regulation adjustable steam ejector II
It is set to the back pressure Pt at this moment；If not satisfied, maintain executing agency's aperture of adjustable steam ejector II constant, while P0 weights
It is set to the back pressure Pt at this moment；When certain moment, back pressure Pt was reduced to (1-a) P0, control module regulation adjustable steam ejector
II executing agency's aperture reduces n, while P0 resets to the back pressure Pt at this moment；
P0 is the back pressure value of initial time condenser defined in it, and Pt is the back pressure value of t condenser, and m, n are adjustable
Formula steam jet ejector executing agency acts the size of aperture every time, and a, b are t back pressure of condenser Pt compared with initial backpressure P0
Deviation ratio, and meet following formula：
C is t theory coefficient of heat transfer K' and actual coefficient of heat transfer K deviation ratio, and meets following formula：
K', K calculating should meet following equation：
K'=K0f(β,βw,βt,βz,βd)
In formula：The theoretical coefficient of heat transfer of K'-calculating, K0- basic the coefficient of heat transfer, β-consideration cooling surface clean condition
With condensation tube material and the coefficient of wall thickness, βw,βt,βz,βd- consider cooling medium flow velocity, coolant temperature, cooling medium stream
The correction factor of the influences such as number of passes, steam load rate；The coefficient of heat transfer for K-actually calculate, h "-steam discharge enthalpy, hs- hydrophobic enthalpy
Value, A- heat exchange areas, Δ tm- mean temperature difference；
During system fading margin, meet formula：0 ＜ a≤0.1,0 ＜ b≤0.1,0 ＜ n≤m≤5%, 0 ＜ c≤min (a, b)
P1 is defined, maximum suction pressure when max is I normal work of adjustable steam ejector, P2, min are adjustable
Minimum suction pressure during formula II normal work of steam jet ejector, and meet P2, min ＜ P1, max.
Relative to prior art, present invention obtains advantages below：
1st, easy maintenance；
2nd, power consumption is low；
3rd, noise is low, and suction capactity is stable；
4th, can good conformity main frame operating mode change, there is good energy-saving benefit.
Instance analysis：
Power plant's vacuum tightness general control obtains preferably at present, but is based on unit safety sex chromosome mosaicism, and vaccum-pumping equipment must select
Type can be designed using under the conditions of poor tightness as design conditions, therefore, be taken out for the injection of fixed multistage steam true
For empty set system, under unit normal running (operation) conditions, suction capactity significantly larger than actually leaks into air capacity, wastes more move
Power steam consumption, cause unnecessary energy loss.
By taking certain power plant's pumped vacuum systems as an example, contrast design operating mode, vacuum tightness 300Pa/min, 200Pa/min,
Calculating is carried out under the conditions of 100Pa/min to be analyzed as follows：
The vacuum tightness of unit can be generally controlled within 200Pa/min at present, and preferable unit can control
Within 100Pa/min, as can be seen from the above table, pumped vacuum systems is sprayed using adjustable+fixed multistage steam, relatively using solid
Fixed pattern amount of energy saving is obvious.
Claims (5)
1. a kind of pumped vacuum systems, what the system was primarily adapted for use in current in-service unit vacuumizes transformation project, is main frame vacuum
Vacuum keeping apparatus after foundation, it is standby each other with former vacuum system；It is characterized in that：
The system mainly includes steam buffer tank (2), attemperator (19), adjustable steam ejector I (3), adjustable steam
Injector II (4), fixed steam jet ejector (5), three steam cooling devices (6,7,8) to match with steam jet ejector,
Draining system uses the U-shaped water seal of single-stage (9,10) and multi-stage U-shaped water seal (11), and the valves and fittings of connection apparatus above；
When systems are functioning properly, its specific workflow is that main frame draws gas by (2) voltage stabilizing of steam buffer tank and through desuperheat
After device spray desuperheating, as power steam respectively enter adjustable steam ejector I (3), adjustable steam ejector II (4),
Fixed steam jet ejector (5), three steam jet ejectors are the relations of series connection, and adjustable steam ejector I is directly and condenser
(1) connect, aspirate incondensable gas in condenser and cooled down after being mixed with power steam into first order cooling device (6),
Adjustable steam ejector II is connected with first order cooling device, is aspirated after its interior incondensable gas mixes with power steam and is entered
Second level cooling device (7), last fixed steam jet ejector again pump out incondensable gas in the condensing unit of the second level
It is sent into third level cooling device (8) to be cooled down, sufficiently cool rear incondensable gas is discharged in air；
During unit starting, exhaust steam inlet valve I (14) is closed, opens exhaust steam inlet valve II (15), former vacuum system startup optimization, machine
After setting up vertical vacuum, exhaust steam inlet valve II is closed, opens exhaust steam inlet valve I, power steam inlet valve (13), power steam regulation
Valve (12), cooling water system is put into, closes original vacuum system, steam jet ejector pumped vacuum systems puts into operation；
This set pumped vacuum systems is using adjustable steam ejector+fixed steam jet ejector combination, adjustable steam ejector
Ith, it is adjusted when the aperture of the actuator of adjustable steam ejector II changes according to unit back pressuce by control module.
2. pumped vacuum systems according to claim 1, it is characterised in that：Every grade of the hydrophobic of cooling device uses single-stage U-shaped
Water seal.
3. pumped vacuum systems according to claim 1, it is characterised in that：Every grade of cooling device it is hydrophobic using drain valve or
Person's multi-stage U-shaped water seal.
4. the pumped vacuum systems according to any one of claims 1 to 3, it is characterised in that：
During unit normal operation, power steam is taken main frame and drawn gas, and ensures steam parameter after steam buffer tank (2) desuperheat voltage stabilizing
Pressure=0.3~0.8MPa (abs.), temperature overheating degree=10~20 DEG C；Pressure is installed on power steam surge tank (2) body
Power transmitter (17), attemperator (18), thermal resistance (19), pressure transmitter detected value act on power steam by control module
Regulating valve (12), thermal resistance detected value act on Desuperheating water regulating valve (20) by control module, it is ensured that steam jet ejector power
Steam inlet pressure, temperature are without departing from design load.
A kind of 5. adjusting method of pumped vacuum systems for described in claim any one of 1-4, it is characterised in that：When system is thrown
After entering, condenser pressure is in P0≤P2, and during min, system uses the combination of three-level injector series connection, closes exhaust steam and enters vapour
Valve II, exhaust steam inlet valve III, exhaust steam inlet valve I is opened, three steam jet ejectors put into operation；
When being fluctuated within this range with condenser pressure, the execution machine of adjustable steam ejector I is adjusted by control module
Structure, when certain moment, back pressure Pt increased to (1+a) P0, the theoretical coefficient of heat transfer and the actual coefficient of heat transfer are calculated, judges whether to meet K
≤ (1-c) K', when meeting this condition, executing agency aperture the increase m, P0 of control module regulation adjustable steam ejector I
Reset to the back pressure Pt at this moment；If not satisfied, maintain executing agency's aperture of adjustable steam ejector I constant, while P0
Reset to the back pressure Pt at this moment；When certain moment, back pressure Pt was reduced to (1-b) P0, control module regulation adjustable steam injection
Executing agency's aperture of device I reduces n, while P0 resets to the back pressure Pt at this moment；When condenser pressure is in P0 ＞ P2, min,
System uses the combination of two-stage level injector series connection, closes power steam inlet valve (13), exhaust steam inlet valve II, opens weary
Vapour inlet valve III, exhaust steam inlet valve I, the non-condensable gas for making to be sucked in condenser are direct after first order cooling device cools down
Into adjustable steam ejector II, adjustable steam ejector I is stopped, with condenser pressure ripple within the above range
When dynamic, i.e. when P0 ＞ P2, min, pass through the executing agency that control module adjusts adjustable steam ejector II.When certain moment back pressure
When Pt increases to (1+a) P0, the theoretical coefficient of heat transfer and the actual coefficient of heat transfer are calculated, judges whether to meet K≤(1-c) K', when full
During this condition of foot, executing agency aperture the increase m, P0 of control module regulation adjustable steam ejector II reset to this moment
Back pressure Pt；If not satisfied, maintain executing agency's aperture of adjustable steam ejector II constant, while P0 resets to this moment
Back pressure Pt；When certain moment, back pressure Pt was reduced to (1-b) P0, control module adjusts the executing agency of adjustable steam ejector II
Aperture reduces n, while P0 resets to the back pressure P at this moment；
P0 is the back pressure value of initial time condenser defined in it, and Pt is the back pressure value of t condenser, and m, n are adjustable steaming
Vapour injector executing agency acts the size of aperture every time, and a, b are deviations of the t back pressure of condenser Pt compared with initial backpressure P0
Rate, and meet following formula：
<mrow>
<mi>a</mi>
<mo>=</mo>
<mi>b</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mo>|</mo>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<msub>
<mi>P</mi>
<mi>t</mi>
</msub>
<mo>|</mo>
</mrow>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
</mfrac>
</mrow>
C is t theory coefficient of heat transfer K' and actual coefficient of heat transfer K deviation ratio, and meets following formula：
<mrow>
<mi>c</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mo>|</mo>
<msup>
<mi>K</mi>
<mo>&prime;</mo>
</msup>
<mo>-</mo>
<mi>K</mi>
<mo>|</mo>
</mrow>
<msup>
<mi>K</mi>
<mo>&prime;</mo>
</msup>
</mfrac>
</mrow>
K', K calculating should meet following equation：
K'=K0f (β, β w, β t, β z, β d)
<mrow>
<mi>K</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>G</mi>
<mi>m</mi>
</msub>
<mrow>
<mo>(</mo>
<msup>
<mi>h</mi>
<mrow>
<mo>&prime;</mo>
<mo>&prime;</mo>
</mrow>
</msup>
<mo>-</mo>
<msub>
<mi>h</mi>
<mi>s</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>A&Delta;t</mi>
<mi>m</mi>
</msub>
</mrow>
</mfrac>
</mrow>
In formula：The theoretical coefficient of heat transfer of K'-calculating, the K0-basic coefficient of heat transfer, β-consideration cooling surface clean condition and cold
The coefficient of solidifying tube material and wall thickness, β w, β t, β z, β d-consideration cooling medium flow velocity, coolant temperature, cooling medium flow
The correction factor of the influences such as number, steam load rate；The coefficient of heat transfer for K-actually calculate, h "-steam discharge enthalpy, hs-hydrophobic enthalpy
Value, A- heat exchange areas, Δ tm- mean temperature differences；
During system fading margin, meet formula：0 ＜ a≤0.1,0 ＜ b≤0.1,0 ＜ n≤m≤5%, 0 ＜ c≤min (a, b)；Definition
Maximum suction pressure when P1, max are I normal work of adjustable steam ejector, P2, min are adjustable steam ejector
Minimum suction pressure during II normal work, and meet P2, min ＜ P1, max.
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| CN110410161A (en) * | 2019-05-15 | 2019-11-05 | 程琛 | A kind of back pressure turbine quick start method based on cold end optimization |
| CN112880428B (en) * | 2021-01-26 | 2021-11-09 | 江苏南通发电有限公司 | One-key start-stop and interlocking protection control method for jet pump of condenser vacuum system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644627A (en) * | 2012-04-26 | 2012-08-22 | 南京佳业检测工程有限公司 | Steam injection pump |
| CN102678638A (en) * | 2012-05-28 | 2012-09-19 | 中国瑞林工程技术有限公司 | Adjustable water ejector vacuum pump |
| CN103321973A (en) * | 2013-07-10 | 2013-09-25 | 上海赛迩福电力技术有限公司 | Condenser steam jet vacuum system |
| CN203772053U (en) * | 2014-04-11 | 2014-08-13 | 张曙光 | Multistage steam ejector vacuum-pumping system of double backpressure condensers |
| CN105114367A (en) * | 2015-09-02 | 2015-12-02 | 上海核工程研究设计院 | Vacuum injector provided with adjustable nozzles and used for nuclear power station vacuum-pumping system |
| CN205748028U (en) * | 2016-06-28 | 2016-11-30 | 程晋瑞 | The condenser multistage steam injection vacuum system that a kind of heat integration recycles |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070025862A1 (en) * | 2005-07-28 | 2007-02-01 | Graham Corporation | Compressible gas ejector with unexpanded motive gas-load gas interface |
-
2017
- 2017-03-16 CN CN201710157814.XA patent/CN106917780B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644627A (en) * | 2012-04-26 | 2012-08-22 | 南京佳业检测工程有限公司 | Steam injection pump |
| CN102678638A (en) * | 2012-05-28 | 2012-09-19 | 中国瑞林工程技术有限公司 | Adjustable water ejector vacuum pump |
| CN103321973A (en) * | 2013-07-10 | 2013-09-25 | 上海赛迩福电力技术有限公司 | Condenser steam jet vacuum system |
| CN203772053U (en) * | 2014-04-11 | 2014-08-13 | 张曙光 | Multistage steam ejector vacuum-pumping system of double backpressure condensers |
| CN105114367A (en) * | 2015-09-02 | 2015-12-02 | 上海核工程研究设计院 | Vacuum injector provided with adjustable nozzles and used for nuclear power station vacuum-pumping system |
| CN205748028U (en) * | 2016-06-28 | 2016-11-30 | 程晋瑞 | The condenser multistage steam injection vacuum system that a kind of heat integration recycles |
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