CN107170487A - The control system and method for many inclined loop operations of the long-term low-power of loop reactor - Google Patents
The control system and method for many inclined loop operations of the long-term low-power of loop reactor Download PDFInfo
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- CN107170487A CN107170487A CN201710266786.5A CN201710266786A CN107170487A CN 107170487 A CN107170487 A CN 107170487A CN 201710266786 A CN201710266786 A CN 201710266786A CN 107170487 A CN107170487 A CN 107170487A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/32—Control of nuclear reaction by varying flow of coolant through the core by adjusting the coolant or moderator temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/18—Use of propulsion power plant or units on vessels the vessels being powered by nuclear energy
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- 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
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
Abstract
The present invention relates to a kind of control system and method for many inclined loop operations of the long-term low-power of loop reactor, the control method includes the descending control method of power and power upload control method.The present invention is by setting up inclined loop operation control system, and using the feasible control method of science, solve atomic-powered ship at sea from shipping row when, the problem of being chronically under low power state the stable operation of unit and steadily exert oneself, atomic-powered ship can be made in long-term low power run, without reactor shutdown, you can realize stable operation of unit and steadily exert oneself, with significant economic benefit；The present invention realizes the long-term low power run in sea of ship, improves the range of applicability of reactor, and due to without the shutdown in power handoff procedure, so as to reduce the risk of low power run, substantially increasing the security and economy of unit.
Description
Technical field
The present invention relates to nuclear reactor technology field, more specifically to a kind of many long-term low-power of loop reactor
The control system and method for inclined loop operation.
Background technology
Nuclear power ship at sea from shipping row when, be chronically at low power state.CPR1000 units evaporator is cooled down just
Loop operation is applied to land large-scale million kilowatt business PWR nuclear power plant partially under normal shutdown pattern, and main function is to ensure
The safety of reactor core under shutdown state, it is impossible to be used in long-term low power operating state.
In long-term low power run flow instability easily occurs for reactor, adds after throttling element, can improve the feelings
Condition, it is however generally that the flow resistance of throttling element is bigger, steam generator operation is more stable, but what the flow resistance of throttling element was manufactured and designed
Limitation, while flow resistance is bigger, cost is higher.Select after suitable throttling element, be computed analyzing and obtain the steady in a long-term of reactor
Low power run point is 20%FP (FP refers to full power), and power is gone still further below, and steam generator will appear from flowing instability
Property.
For ensure the reactors of many loops in this process stable operation, it is necessary to take inclined loop operation reserve, with effectively,
Safely and smoothly sending electric power, there is provided the long-term power from shipping row of nuclear power ship, it is ensured that reactor core and steam generation
Device safe operation, does not occur flow instability.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided a kind of many loop reactions
The control system and method for the inclined loop operation of the long-term low-power of heap.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of many long-term low-power of loop reactor
The descending control method of power of inclined loop operation, comprises the following steps：
S1, the first steam valve of adjustment and the second steam valve aperture, make steam turbine power drop to steam turbine target
Power；
S2, the N platforms steam generator closed in initial M platforms steam generator and its corresponding feed-water valve, feed pump, master
Pump and coolant valve, wherein 1≤N ＜ M, M >=2；
S3, in the first preset time, the primary Ioops flow of remaining (M-N) platform steam generator is by the first initial flow
Increase to the first preset flow；
The core power of reactor is reduced, core power is dropped to reactor core target power；
S4, the outlet vapor of remaining (M-N) the platform steam generator arranged to steam turbine, make the steam turbine power
The steam turbine target power is remained, and unnecessary outlet vapor is discharged by second steam valve；
S5, after after the outlet vapor pressure of remaining (M-N) the platform steam generator and the temperature stabilization of primary Ioops, will
The core power maintains the reactor core target power, the steam turbine power and maintains the steam turbine target power.
Preferably, the steam turbine target power is 10%FP, and the reactor core target power is 10%FP, and the FP is full
Power.
Preferably, the M=4, N=2；
In the step S3, first initial flow is 25%FF1, and first preset flow is 30%FF1, its
In, the total flow of primary Ioops when the FF1 is full power.
Preferably, the step S4 includes：
During the core power declines, remaining (M-N) the platform steam generator the corresponding 3rd is opened
Steam valve, the outlet vapor of remaining (M-N) the platform steam generator is arranged to steam turbine by steam main, is made described
Steam turbine power remains the steam turbine target power, and will be unnecessary in the steam main by second steam valve
Outlet vapor arrange to air or condenser.
Preferably, before the step S1 is performed, the core power is 20%FP, and the steam turbine power is 20%
FP, first steam valve is opened, and the second steam valve is closed, and feedwater enters the M platforms steam generator by throttling element
Second servo loop pipe.
The present invention have also been constructed a kind of power upload control method of the inclined loop operation of many long-term low-power of loop reactor,
It is characterised in that it includes following steps：
Q1, either on or off N platforms steam generator and its corresponding feed-water valve, feed pump, coolant valve and main pump；
After Q2, feedwater flow to the second preset flow of the secondary circuit of the increase N platforms steam generator, pass through the N
The outlet vapor of N platform steam generators is arranged to air or condensation described in the corresponding pressure threshold valve goalkeeper of platform steam generator
Device；
Q3, the coolant flow of the primary Ioops of the increase N platforms steam generator rise core power to target flow
To reactor core target power；
Q4, after the vapor (steam) temperature of the N platforms steam generator reaches preset temperature, open the N platforms steam generator
Corresponding 3rd steam valve, the outlet vapor of the N platforms steam generator is arranged to steam turbine；
Q5, in the second preset time, the coolant flow of the primary Ioops of remaining (M-N) platform steam generator is by second
Initial flow is reduced to the 3rd preset flow, and the outlet vapor of (M-N) platform steam generator is arranged to the steam turbine by described in, its
In 1≤N ＜ M, M >=2.
Q6, after after the pressure of steam main and the temperature stabilization of the primary Ioops, the core power is maintained into reactor core
Target power, the steam turbine power maintain the steam turbine target power.
Preferably, the steam turbine target power is 20%FP, and the reactor core target power is 20%FP, and the FP is full
Power.
Preferably, M=4, the N=2, second preset flow are 5%FF2, the secondary circuit when FF2 is full power
Feedwater total flow；
In the step Q3, the target flow is 25%FF1；
In the step Q5, second initial flow is 30%FF1, and the 3rd preset flow is 25%FF1, its
In, the total flow of primary Ioops when the FF1 is full power.
Preferably, in step q 4, the preset temperature is the vapor (steam) temperature corresponding to reactor core target power.
Preferably, before the step Q1 is performed, the core power is 10%FP, and the steam turbine power is 10%
FP, first steam valve is opened, and second steam valve is closed.
Present invention also offers a kind of control system of many inclined loop operations of the long-term low-power of loop reactor, its feature exists
In including at least two steam generators and the pipeline of the connection control system are provided with control on the pipeline described
The valve of the flow of pipeline；
The pipeline includes water inlet pipe, return pipe and the steam main being connected with steam turbine；Every steam generation
Device includes the first loop pipe and second servo loop pipe；
First loop pipe is connected with the water inlet pipe, return pipe, constitutes primary Ioops；The second servo loop pipe with it is described
Steam main is connected, and constitutes secondary circuit；The heat transfer of the primary Ioops is given the secondary circuit by the steam generator；
The primary Ioops outlet of every steam generator is connected with main pump, and the main pump is that the primary Ioops export outflow
Cooling agent pressurization；
The secondary circuit entrance of every steam generator is connected with feed pump, and the feed pump provides for the secondary circuit
Feedwater；The secondary circuit outlet connection steam main of every steam generator.
Preferably, the valve includes；
First steam valve, for controlling the quantity of steam into the steam turbine, first steam valve is arranged on institute
State between steam main and the steam turbine；
Second steam valve, for connecting the steam main and air or condenser；
Coolant valve, the coolant flow for controlling the primary Ioops, every steam generator and the master
The coolant valve is provided between pump；
Feed-water valve, for control enter the second servo loop pipe confluent, every steam generator with it is described
The feed-water valve is provided between feed pump；
3rd steam valve, for controlling the quantity of steam from the steam generator into the steam main, every institute
State and be provided with the 3rd steam valve between the secondary circuit outlet of steam generator and the steam main；
Pressure threshold valve, for adjusting the pressure threshold in the second servo loop pipe, the pressure threshold valve is set
Between the 3rd steam valve and the steam main.
Preferably, the stream for increasing the secondary circuit is provided between every steam generator and the feed pump
The throttling element of resistance, the throttling element is arranged between the feed pump and the feed-water valve.
Implement the present invention, have the advantages that：The present invention uses section by setting up inclined loop operation control system
Learn feasible control method, solve atomic-powered ship at sea from shipping row when, be chronically at unit under low power state
Stable operation and the problem of steadily exert oneself, can make atomic-powered ship in long-term low power run, without reactor shutdown, you can
Realize stable operation of unit and steadily exert oneself, with significant economic benefit；The present invention realizes the long-term low-power in the sea of ship
Operation, improves the range of applicability of reactor, and due to without the shutdown in power handoff procedure, so as to reduce low-power
The risk of operation, substantially increases the security and economy of unit.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of the control system of the inclined loop operation of many long-term low-power of loop reactor of the invention；
Fig. 2 is the flow of the descending control method of power of the inclined loop operation of many long-term low-power of loop reactor of the invention
Figure；
Fig. 3 be the control system of many long-term low-power of loop reactor of the invention inclined loop operation characteristic curve of pipeline with
The head curve schematic diagram of pump；
Fig. 4 is the flow of the power upload control method of the inclined loop operation of many long-term low-power of loop reactor of the invention
Figure.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
The invention discloses a kind of control system of many inclined loop operations of the long-term low-power of loop reactor, including at least two
The valve of the flow of control pipeline is provided with platform steam generator and the pipeline for connecting control system, pipeline.Wherein, steam
Generator is preferably once through steam generator (OTSG).Pipeline includes water inlet pipe, return pipe and the steaming being connected with steam turbine
Vapour main pipe；Every steam generator includes the first loop pipe and second servo loop pipe.
Wherein, the first loop pipe is connected with water inlet pipe, return pipe, constitutes primary Ioops；Secondary circuit pipe is connected with steam main,
Constitute secondary circuit；Steam generator is by the heat transfer of primary Ioops to secondary circuit.
The primary Ioops outlet of every steam generator is connected with main pump, and main pump is that the cooling agent of primary Ioops outlet outflow adds
Pressure；
The secondary circuit entrance of every steam generator is connected with feed pump, and feed pump provides feedwater for secondary circuit；Every steaming
The secondary circuit outlet connection steam main of vapour generator, the feedwater of feed pump can become to be transferred to after steam in a vapor generator
In steam main.
Valve includes；
First steam valve, for control enter steam turbine quantity of steam, the first steam valve be arranged on steam main with
Between steam turbine.The aperture of the first steam valve is adjusted, can control to enter the quantity of steam of steam turbine from steam main.
Second steam valve, for connecting steam main and air or condenser.The second steam valve is opened, can be made
Steam in steam main and atmosphere, steam main can be arranged to air；Or steam main is connected with condenser, steam
Steam in main pipe can be arranged to condenser.Coolant valve, the coolant flow for controlling primary Ioops, every steam generator
Coolant valve is provided between main pump；
Feed-water valve, for controlling the confluent into second servo loop pipe, sets between every steam generator and feed pump
It is equipped with feed-water valve；
3rd steam valve, for controlling the quantity of steam from steam generator into steam main, every steam generator
Secondary circuit outlet steam main between be provided with the 3rd steam valve；
Pressure threshold valve, for adjusting the pressure threshold in second servo loop pipe, pressure threshold valve is arranged on the 3rd steaming
Between steam valve door and steam main.
Preferably, throttling element is provided between every steam generator and feed pump, the flow resistance for increasing secondary circuit.Tool
Body, throttling element is arranged between feed pump and feed-water valve.
The heat transmission process of control system of the present invention is as follows：
Fuel assembly is taken away heat → steam generator because nuclear fission produces heat → primary Ioops cooling agent and incited somebody to action in reactor core
The heat transfer of primary Ioops cooling agent feeds water to secondary circuit, and feedwater is heated as into steam → steam does work by steam turbine, vapour
The mechanical energy of rotor is converted to electric energy and generated electricity by mechanical energy → generator that the heat energy of steam is converted to rotor by turbine.
Below by by taking the control system of the long-term low-power of Fourth Ring road reactor inclined loop operation as an example, the control to the present invention
System is illustrated.
Refering to Fig. 1, control system of the present invention includes four once through steam generator (OTSG) A, B, C, D, water inlet pipe G1, returns
The water pipe G1 and steam main G3 being connected with steam turbine.The first steam valve is provided between steam main G3 and steam turbine
F1 and the second steam valve F2, the first steam valve F1 control enter the quantity of steam of steam turbine, and the second steam valve F2 connections are steamed
Vapour main pipe G3 and air or condenser.Every steam generator includes the first loop pipe and second servo loop pipe, i.e.,：Steam generator
A, which includes the first loop pipe A12 and second servo loop pipe A24, steam generator B, includes the first loop pipe B12 and second servo loop pipe
B24, steam generator C, which include the first loop pipe C12 and second servo loop pipe C24, steam generator D, includes the first loop pipe D12
With second servo loop pipe D24.First loop pipe A12, B12, C12, D12 is connected with water inlet pipe G1 and return pipe G2 respectively, constitutes one
Loop；Second servo loop pipe A24, B24, C24, D24 are connected with steam main G3 respectively, constitute secondary circuit.
Steam generator A primary Ioops outlet is connected with main pump A1 pumps, and main pump A1 pumps are used for for one time of steam generator A
The cooling agent pressurization of way outlet outflow.Be provided with coolant valve A1 between steam generator A and main pump A1 pumps, for control into
Go out the coolant flow of steam generator A primary Ioops.
Steam generator A secondary circuit entrance is connected with feed pump A2 pumps, and feed pump A2 pumps are used for for steam generator A's
Secondary circuit provides feedwater.Feed-water valve A21 is provided between steam generator A and feed pump A2 pumps, feed-water valve A21 is used to control
System enters second servo loop pipe A24 confluent.Throttling element E1 is additionally provided between steam generator A and feed pump A2 pumps, is throttled
Part E1 is arranged between feed pump A2 pumps and feed-water valve A21 pumps, the secondary circuit flow resistance for increasing steam generator A.
The 3rd steam valve A23 is provided between steam generator A secondary circuit outlet and steam main G3, for controlling
Enter steam main G3 quantity of steam from steam generator A.Further, steam generator A secondary circuit outlet and steam are female
Pressure threshold valve A22 is additionally provided between pipe G3, it is female with steam that pressure threshold valve A22 is arranged on the 3rd steam valve A23
Between pipe G3.When pressure exceedes pressure threshold in second servo loop pipe A24, pressure threshold valve A22 is opened, and is discharged steam, is entered
And reduce pressure.
Steam generator B primary Ioops outlet is connected with main pump B1 pumps, and main pump B1 pumps are used for for one time of steam generator B
The cooling agent pressurization of way outlet outflow.Coolant valve B11 is provided between steam generator B and main pump B1 pumps, for controlling
Pass in and out the coolant flow of steam generator B primary Ioops.
Steam generator B secondary circuit entrance is connected with feed pump B2 pumps, and feed pump B2 pumps are used for for steam generator B's
Secondary circuit provides feedwater.Feed-water valve B21 is provided between steam generator B and feed pump B2 pumps, feed-water valve B21 is used to control
System enters second servo loop pipe B24 confluent.Throttling element E2 is additionally provided between steam generator B and feed pump B2 pumps, is throttled
Part E2 is arranged between feed pump B2 pumps and feed-water valve B21 pumps, the secondary circuit flow resistance for increasing steam generator B.
The 3rd steam valve B23 is provided between steam generator B secondary circuit outlet and steam main G3, for controlling
Enter steam main G3 quantity of steam from steam generator B.Further, steam generator B secondary circuit outlet and steam are female
Pressure threshold valve B22 is additionally provided between pipe G3, it is female with steam that pressure threshold valve B22 is arranged on the 3rd steam valve B23
Between pipe G3.When pressure exceedes pressure threshold in second servo loop pipe B24, pressure threshold valve B22 is opened, and is discharged steam, is entered
And reduce pressure.
Steam generator C primary Ioops outlet is connected with main pump C1 pumps, and main pump C1 pumps are used to control to enter from steam generator C
Enter steam main G3 quantity of steam, coolant valve C11 be provided between steam generator C and main pump C1 pumps, for control into
Go out the coolant flow of steam generator C primary Ioops.
Steam generator C secondary circuit entrance is connected with feed pump C2 pumps, and feed pump C2 pumps are used for for steam generator C's
Secondary circuit provides feedwater.Feed-water valve C21 is provided between steam generator C and feed pump C2 pumps, feed-water valve C21 is used to control
System enters second servo loop pipe C24 confluent.Throttling element E3 is additionally provided between steam generator C and feed pump C2 pumps, is throttled
Part E3 is arranged between feed pump C2 pumps and feed-water valve C21 pumps, the secondary circuit flow resistance for increasing steam generator C.
The 3rd steam valve C23 is provided between steam generator C secondary circuit outlet and steam main G3, for controlling
Enter steam main G3 quantity of steam from steam generator C.Further, steam generator C secondary circuit outlet and steam are female
Pressure threshold valve C22 is additionally provided between pipe G3, it is female with steam that pressure threshold valve C22 is arranged on the 3rd steam valve C23
Between pipe G3.When pressure exceedes pressure threshold in second servo loop pipe C24, pressure threshold valve C22 is opened, and is discharged steam, is entered
And reduce pressure.
Steam generator D primary Ioops outlet is connected with main pump D1 pumps, and main pump D1 pumps are used for for one time of steam generator D
The cooling agent pressurization of way outlet outflow.Coolant valve D11 is provided between steam generator D and main pump D1 pumps, for controlling
Pass in and out the coolant flow of steam generator D primary Ioops.
Steam generator D secondary circuit entrance is connected with feed pump D2 pumps, and feed pump D2 pumps are used for for steam generator D's
Secondary circuit provides feedwater.Feed-water valve D21 is provided between steam generator D and feed pump D2 pumps, feed-water valve D21 is used to control
System enters second servo loop pipe D24 confluent.Throttling element E4 is additionally provided between steam generator D and feed pump D2 pumps, is throttled
Part E4 is arranged between feed pump D2 pumps and feed-water valve D21 pumps, the secondary circuit flow resistance for increasing steam generator D.
The 3rd steam valve D23 is provided between steam generator D secondary circuit outlet and steam main G3, for controlling
Enter steam main G3 quantity of steam from steam generator D.Further, steam generator D secondary circuit outlet and steam are female
Pressure threshold valve D22 is additionally provided between pipe G3, it is female with steam that pressure threshold valve D22 is arranged on the 3rd steam valve D23
Between pipe G3.When pressure exceedes pressure threshold in second servo loop pipe D24, pressure threshold valve D22 is opened, and is discharged steam, is entered
And reduce pressure.
Refering to Fig. 2, the invention also discloses a kind of power of many inclined loop operations of the long-term low-power of loop reactor is descending
Control method, the descending control method of the power comprises the following steps：
S1, the first steam valve of adjustment and the second steam valve aperture, make steam turbine power drop to steam turbine target
Power.Preferably, before step S1 is performed, core power is 20%FP, and steam turbine power is 20%FP, the first steam valve
Open, the second steam valve is closed, feedwater enters the second servo loop pipe of M platform steam generators by throttling element.
S2, the N platforms steam generator closed in initial M platforms steam generator and its corresponding feed-water valve, feed pump, master
Pump and coolant valve, wherein 1≤N ＜ M, M >=2.Preferably, M=4, N=2.
S3, in the first preset time, the primary Ioops flow of remaining (M-N) platform steam generator is by the first initial flow
Increase to the first preset flow；The core power of reactor is reduced, core power is dropped to reactor core target power.Preferably,
One initial flow is 25%FF1, and the first preset flow is 30%FF1, wherein, the total flow of primary Ioops when FF1 is full power.
S4, the outlet vapor of remaining (M-N) platform steam generator arranged to steam turbine, steam turbine power is remained vapour
Turbine target power, and unnecessary outlet vapor is discharged by the second steam valve.Specifically, step S4 includes：In reactor core
During power drop, corresponding 3rd steam valve of remaining (M-N) platform steam generator is opened, by remaining (M-N)
The outlet vapor of platform steam generator is arranged to steam turbine by steam main, steam turbine power is remained steam turbine target work(
Rate, and arranged outlet vapor unnecessary in steam main to air or condenser by the second steam valve.
S5, after after the outlet vapor pressure of remaining (M-N) platform steam generator and the temperature stabilization of primary Ioops, by reactor core
Power maintains the reactor core target power, steam turbine power and maintains steam turbine target power.
In the descending control method of power of the present invention, steam turbine target power is preferably 10%FP, reactor core target power
Preferably 10%FP, FP are full power.
Below by taking the control method of the control system of the inclined loop operation of the long-term low-power of Fourth Ring road reactor as an example, to this
The descending control method of power of invention is illustrated, in the embodiment, and initial core power is 20%FP, and reactor core target power is
10%FP；Initial steam turbine power is 20%FP, and steam turbine target power is 10%FP.
The descending control method of power of the inclined loop operation of the long-term low-power of Fourth Ring road reactor includes：
S1, the aperture for adjusting the first steam valve F1 and the second steam valve F2, make steam turbine power drop to 10%FP.
S2, steam off generator B, steam generator D, and the corresponding feed-water valve B21 of steam off generator B, give
Water pump B2 pumps, main pump B1 pumps, coolant valve B11 and the corresponding feed-water valve D21 of steam generator D, feed pump D2 pumps, main pump
D1 pumps and coolant valve D11.
S3, in the first preset time, remaining two steam generators A, C primary Ioops flow are by the first initial flow
2000m3/ h increases to the first preset flow 2500m3/ h, the first preset time can be 60s；
The core power of reactor is reduced by control device, core power is dropped to 10%FP.
Steam generator A, C primary Ioops flow are by the first initial flow 2000m3/ h increases to the first preset flow 2500m3/
H is due to that reactor core pressure drop is reduced with primary Ioops flow-reduction, while the head curve of main pump is constant, i.e. characteristic curve of pipeline
It can decline (as shown in figure 3, intersection point moves to m1 points by m points) with the intersection point of the head curve of pump, therefore point of intersection is corresponding one time
Road flow can rise, so that core power is slightly larger than reactor core target power, now reduce reaction by control device again
The core power of heap, makes core power drop to reactor core target power 10%FP.
S4, during core power declines, open the corresponding 3rd steam valve A23 of steam generator A and steam
The corresponding 3rd steam valve C23 of generator C, steam main is passed through by steam generator A and steam generator C outlet vapor
G3 is arranged to steam turbine, steam turbine power is remained steam turbine target power 10%FP, and will be steamed by the second steam valve F2
Unnecessary outlet vapor is arranged to air or condenser in vapour main pipe G3.
S5, after after steam generator A and steam generator C outlet vapor pressure and the temperature stabilization of primary Ioops, by heap
Core power maintains 10%FP, steam turbine power and maintains 10%FP, and power descending phase terminates.
Refering to Fig. 4, the invention also discloses a kind of power of many inclined loop operations of the long-term low-power of loop reactor is up
Control method, the power upload control method comprises the following steps：
Q1, either on or off N platforms steam generator and its corresponding feed-water valve, feed pump, coolant valve and main pump.
Preferably, before step Q1 is performed, core power is 10%FP, and steam turbine power is 10%FP, and the first steam valve is opened
Open, the second steam valve is closed.
After Q2, feedwater flow to the second preset flow for the secondary circuit for increasing N platform steam generators, sent out by N platforms steam
The outlet vapor of the corresponding pressure threshold valve goalkeeper N platform steam generators of life device is arranged to air or condenser.Now N platforms steam
Corresponding 3rd steam valve of vapour generator is closed, and this is due to that incipient steam quality may be bad, is not inconsistent
Close and require, if steam turbine will be damaged by directly arranging to steam turbine, therefore the steam of incipient stage is first discharged to air or condenser.
Q3, the coolant flow of the primary Ioops of increase N platform steam generators make core power rise to heap to target flow
Core target power；
Q4, after the vapor (steam) temperature of N platform steam generators reaches preset temperature, open N platform steam generators corresponding the
Three steam valves, the outlet vapor of N platform steam generators is arranged to steam turbine.In step q 4, preset temperature is reactor core target
Vapor (steam) temperature corresponding to power.
Q5, in the second preset time, the coolant flow of the primary Ioops of remaining (M-N) platform steam generator is by second
Initial flow is reduced to the 3rd preset flow, and the outlet vapor of (M-N) platform steam generator is arranged to steam turbine, wherein 1≤N ＜
M, M >=2.
Q6, after after the pressure of steam main and the temperature stabilization of primary Ioops, by core power maintain reactor core target power,
Steam turbine power maintains steam turbine target power.
Preferably, steam turbine target power is 20%FP, and reactor core target power is 20%FP, and FP is full power.Preferably,
M=4, N=2, the second preset flow are 5%FF2, the feedwater total flow of secondary circuit when FF2 is full power.Preferably, step Q3
In, target flow is 25%FF1；In step Q5, the second initial flow is 30%FF1, and the 3rd preset flow is 25%FF1, its
In, the total flow of primary Ioops when FF1 is full power.
Below by taking the control method of the control system of the inclined loop operation of the long-term low-power of Fourth Ring road reactor as an example, to this
The power upload control method of invention is illustrated, in the embodiment, and initial core power is 10%FP, and reactor core target power is
20%FP；Initial steam turbine power is 10%FP, and steam turbine target power is 20%FP.
The power upload control method of the inclined loop operation of the long-term low-power of Fourth Ring road reactor includes：
Steam generator B and its corresponding feed-water valve B21, feed pump B2 pumps, main pump that Q1, opening are closed
B1 pumps, coolant valve B11, open steam generator D and its corresponding feed-water valve D21, feed pump D2 pumps, main pump D1 pumps and
Coolant valve D11.
Q2, increase steam generator B and steam generator D secondary circuit feedwater flow to the second preset flow 5%FF2
Afterwards, steam generator B outlet vapor is arranged to air or cold by steam generator B corresponding pressure threshold valve B22
Condenser；Steam generator D outlet vapor arranged to air by steam generator D corresponding pressure threshold valve D22 or
Condenser.
Q3, increase steam generator B and steam generator D primary Ioops coolant flow to target flow 2000m3/
H, so that core power rises to reactor core target power 10%FP；
Q4, treat that the vapor (steam) temperature of this two steam generators of steam generator B and steam generator D reaches preset temperature
Afterwards, the corresponding 3rd steam valve D23 of the corresponding 3rd steam valve B23 and steam generator D of steam generator B are opened, will
Steam generator B and steam generator D outlet vapor are arranged to steam turbine.In step Q4, preset temperature is reactor core target
Corresponding vapor (steam) temperature when power is 10%FP.
Q5, in the second preset time, the coolant flow of remaining two steam generators A, C primary Ioops is by second
Initial flow 2500m3/ h is reduced to the 3rd preset flow 2000m3/ h, opens the 3rd steam valve A23 and C23, by steam generation
Device A, steam generator C outlet vapor are arranged to steam turbine.Wherein, the second preset time can be 60s.
Q6, after after steam main G3 pressure and the temperature stabilization of primary Ioops, core power is maintained into 10%FP, steamer
Acc power maintains 10%FP, and the power up stage terminates.
It should be understood that in preceding once inclined loop operation descending phase, closing is B platforms and D platform steam generators
Valve, the then valve closed during a rear descending phase on A platforms and C platform steam generators, alternate run B, D platform steam generator
With A, C platform steam generator, the possibility that heat-transfer pipe is damaged is reduced.Similarly, the up stage is also required to alternate run.That is,
Control system of the present invention can alternately cut off two steam generators, improve four steam generators when each power switches
Service life.
In summary, the present invention is by setting up inclined loop operation control system, and using the feasible control method of science, solves
Determined atomic-powered ship at sea from shipping row when, be chronically at the stable operation of unit under low power state and steadily exert oneself
Problem, can make self-propulsion type atomic-powered ship in long-term low power run, without reactor shutdown, you can realize that set steady is transported
Go and steadily exert oneself, with significant economic benefit；The present invention realizes the long-term low power run in the sea of self-propulsion type ship, improves
The range of applicability of reactor, and due to without the shutdown in power handoff procedure, so as to reduce the wind of low power run
Danger, substantially increases the security and economy of unit.
Above example only expresses the preferred embodiment of the present invention, and it describes more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention；It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, independent assortment can be carried out to above-mentioned technical characterstic, some deformations can also be made
And improvement, these belong to protection scope of the present invention；Therefore, all equivalents done with scope of the invention as claimed with
Modification, all should belong to the covering scope of the claims in the present invention.
Claims (13)
1. a kind of descending control method of power of the inclined loop operation of many long-term low-power of loop reactor, it is characterised in that including
Following steps：
S1, the first steam valve of adjustment and the second steam valve aperture, make steam turbine power drop to steam turbine target power；
S2, the N platforms steam generator closed in initial M platforms steam generator and its corresponding feed-water valve, feed pump, main pump and
Coolant valve, wherein 1≤N ＜ M, M >=2；
S3, in the first preset time, the primary Ioops flow of remaining (M-N) platform steam generator is increased to by the first initial flow
First preset flow；
The core power of reactor is reduced, core power is dropped to reactor core target power；
S4, the outlet vapor of remaining (M-N) the platform steam generator arranged to steam turbine, keep the steam turbine power
For the steam turbine target power, and unnecessary outlet vapor is discharged by second steam valve；
S5, after after the outlet vapor pressure of remaining (M-N) the platform steam generator and the temperature stabilization of primary Ioops, will be described
Core power maintains the reactor core target power, the steam turbine power and maintains the steam turbine target power.
2. the descending control method of power according to claim 1, it is characterised in that the steam turbine target power is 10%
FP, the reactor core target power is 10%FP, and the FP is full power.
3. the descending control method of power according to claim 2, it is characterised in that the M=4, N=2；
In the step S3, first initial flow is 25%FF1, and first preset flow is 30%FF1, wherein,
The total flow of primary Ioops when the FF1 is full power.
4. the descending control method of power according to claim 1, it is characterised in that the step S4 includes：
During the core power declines, corresponding 3rd steam of remaining (M-N) the platform steam generator is opened
Valve, the outlet vapor of remaining (M-N) the platform steam generator is arranged to steam turbine by steam main, makes the steamer
Acc power remains the steam turbine target power, and is gone out by second steam valve by unnecessary in the steam main
Mouth steam is arranged to air or condenser.
5. the descending control method of power according to claim any one of 1-4, it is characterised in that performing the step S1
Before, the core power is 20%FP, and the steam turbine power is 20%FP, and first steam valve is opened, and second steams
Steam valve door is closed, and feedwater enters the second servo loop pipe of the M platforms steam generator by throttling element.
6. a kind of power upload control method of the inclined loop operation of many long-term low-power of loop reactor, it is characterised in that including
Following steps：
Q1, either on or off N platforms steam generator and its corresponding feed-water valve, feed pump, coolant valve and main pump；
After Q2, feedwater flow to the second preset flow of the secondary circuit of the increase N platforms steam generator, steamed by the N platforms
The outlet vapor of N platform steam generators is arranged to air or condenser described in the corresponding pressure threshold valve goalkeeper of vapour generator；
Q3, the coolant flow of the primary Ioops of the increase N platforms steam generator make core power rise to heap to target flow
Core target power；
Q4, after the vapor (steam) temperature of the N platforms steam generator reaches preset temperature, open N platforms steam generator correspondence
The 3rd steam valve, the outlet vapor of the N platforms steam generator is arranged to steam turbine；
Q5, in the second preset time, the coolant flow of the primary Ioops of remaining (M-N) platform steam generator is initial by second
Flow-reduction is to the 3rd preset flow, and the outlet vapor of (M-N) platform steam generator is arranged to the steam turbine by described in, wherein 1
≤ N ＜ M, M >=2；
Q6, after after the pressure of steam main and the temperature stabilization of the primary Ioops, the core power is maintained into the reactor core
Target power, steam turbine power maintains steam turbine target power.
7. power upload control method according to claim 6, it is characterised in that the steam turbine target power is 20%
FP, the reactor core target power is 20%FP, and the FP is full power.
8. power upload control method according to claim 7, it is characterised in that M=4, the N=2, described second is pre-
If flow is 5%FF2, the feedwater total flow of secondary circuit when the FF2 is full power；
In the step Q3, the target flow is 25%FF1；
In the step Q5, second initial flow is 30%FF1, and the 3rd preset flow is 25%FF1, wherein, institute
The total flow of primary Ioops when stating FF1 for full power.
9. power upload control method according to claim 6, it is characterised in that in step q 4, the preset temperature
For the vapor (steam) temperature corresponding to the reactor core target power.
10. the power upload control method according to claim any one of 6-9, it is characterised in that performing the step
Before Q1, the core power is 10%FP, and the steam turbine power is 10%FP, and first steam valve is opened, described
Second steam valve is closed.
11. a kind of control system of the inclined loop operation of many long-term low-power of loop reactor, it is characterised in that including at least two
The valve for the flow for controlling the pipeline is provided with the pipeline of steam generator and the connection control system, the pipeline
Door；
The pipeline includes water inlet pipe, return pipe and the steam main being connected with steam turbine；Every steam generator bag
Include the first loop pipe and second servo loop pipe；
First loop pipe is connected with the water inlet pipe, return pipe, constitutes primary Ioops；The second servo loop pipe and the steam
Main pipe is connected, and constitutes secondary circuit；The heat transfer of the primary Ioops is given the secondary circuit by the steam generator；
The primary Ioops outlet of every steam generator is connected with main pump, and the main pump is that the primary Ioops export the cold of outflow
But agent is pressurizeed；
The secondary circuit entrance of every steam generator is connected with feed pump, and the feed pump is that the secondary circuit is supplied to
Water；The secondary circuit outlet connection steam main of every steam generator.
12. control system according to claim 11, it is characterised in that the valve includes；
First steam valve, for controlling the quantity of steam into the steam turbine, first steam valve is arranged on the steaming
Between vapour main pipe and the steam turbine；
Second steam valve, for connecting the steam main and air or condenser；
Coolant valve, the coolant flow for controlling the primary Ioops, every steam generator and the main pump it
Between be provided with the coolant valve；
Feed-water valve, for controlling the confluent into the second servo loop pipe, every steam generator and the feedwater
The feed-water valve is provided between pump；
3rd steam valve, for controlling the quantity of steam from the steam generator into the steam main, every steaming
The 3rd steam valve is provided between the secondary circuit outlet of vapour generator and the steam main；
Pressure threshold valve, for adjusting the pressure threshold in the second servo loop pipe, the pressure threshold valve is arranged on institute
State between the 3rd steam valve and the steam main.
13. control system according to claim 12, it is characterised in that every steam generator and the feed pump
Between be provided with the throttling element of flow resistance for increasing the secondary circuit, the throttling element be arranged on the feed pump and it is described to
Between penstock.
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