CN209525934U - A kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect - Google Patents
A kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect Download PDFInfo
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- CN209525934U CN209525934U CN201822191696.7U CN201822191696U CN209525934U CN 209525934 U CN209525934 U CN 209525934U CN 201822191696 U CN201822191696 U CN 201822191696U CN 209525934 U CN209525934 U CN 209525934U
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- pipeline
- feed pump
- main feed
- impulse
- valve
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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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Abstract
The utility model belongs to nuclear plant safety auxiliary equipment, and in particular to a kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect.Water-supply line is pressed to connect with the first of the first main feed pump in one end of first impulse pipeline, one end of second impulse pipeline presses water-supply line to connect with the second of the second main feed pump, and one end of third impulse pipeline presses water-supply line to connect with the third of third main feed pump；The other end of first impulse pipeline, the second impulse pipeline and third impulse pipeline is linked together by connecting pipeline；It is disposed with the first regulating valve and the first isolating valve on first impulse pipeline, the second regulating valve and the second isolating valve are disposed on the second impulse pipeline, is disposed with third regulating valve and third isolating valve on third impulse pipeline.Existing pressure difference is effectively reduced restriction loss and is influenced on pipeline erosion by the way of pressure pipeline impulse in main feed pump between each component during the utility model takes full advantage of original system operation.
Description
Technical field
The utility model belongs to nuclear plant safety auxiliary equipment, and in particular to a kind of reduction main feed pump promptly switches to core
The device of motor group transient effect.
Background technique
The temporary disturbance generated in the urgent handoff procedure of pressurized-water reactor nuclear power plant main feed pump, to the safe and stable operation of unit
It is serious challenge, unit temporary disturbance caused by promptly switching because of main feed pump all once occurred in domestic multiple nuclear power stations, caused
The event for shutting down shutdown occurs.
It finds by literature search: there is weak ring in the main feed pump system design of country's pressurized-water reactor nuclear power plant at present
Section is stored in a large amount of low temperature in spare main feed pump circuit since original design has ignored from the point of view of each nuclear power station operating condition
Water is to system, or even the influence of entire nuclear power unit operation.When the failure of normal main feed pump or need cut-in stand-by master
When feed pump, a large amount of low temperature feedwater moment is pumped into height and added by the spare main feed pump of emergency start, leads to stopping HP heater, unit
Overpower, or even shut down shutdown.In addition, hot and cold water umklappen for main feed pump thermal shock the problems such as it is also anxious to be resolved.
Summary of the invention
The purpose of this utility model is to provide a kind of reduction main feed pumps promptly to switch to nuclear power unit transient effect
Device, the sustainable fluid temperature (F.T.) maintained in spare main feed pump and its pipeline is consistent with operation main feed pump, avoids system pipes
The water at low temperature not recycled for a long time in road flows through high plus leads to stopping HP heater, unit overpower；Prevent reserve feed pump startup when
It waits by thermal shock；Reduce heating coil time when main feed pump starting；Improve the water quality in the spare main feed pump pump housing and pipeline,
Prevent steam generator water degradation after pump startup.
The utility model while alleviating nuclear power unit transient state, will transformation bring negative effect (such as: fluid is long-term
Wash away the influence to newly-increased pipeline and key equipment) acceptable level is dropped to, improve the security and stability of nuclear power plant's operation.
In order to achieve the above objectives, technical solution adopted in the utility model are as follows:
A kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect, including the first impulse pipeline,
Two impulse pipelines, third impulse pipeline, the first regulating valve, the second regulating valve, third regulating valve, the first isolating valve, the second isolation
Valve, third isolating valve and connecting pipeline；Pressure water-supply line connects in one end of first impulse pipeline and the first of the first main feed pump
It connects, one end of the second impulse pipeline presses water-supply line to connect with the second of the second main feed pump, one end of third impulse pipeline
Water-supply line is pressed to connect with the third of third main feed pump；First impulse pipeline, the second impulse pipeline and third impulse pipeline
The other end linked together by connecting pipeline；The first regulating valve and the first isolation are disposed on first impulse pipeline
Valve is disposed with the second regulating valve and the second isolating valve on the second impulse pipeline, is disposed on third impulse pipeline
Three regulating valves and third isolating valve.
The first impulse pipeline, the second impulse pipeline, third impulse pipeline material select 304L stainless steel.
The first impulse pipeline, the second impulse pipeline, third impulse pipeline specification be Φ 42.2 ×
4.85。
First regulating valve, the second regulating valve, third regulating valve, the first isolating valve, the second isolating valve, third isolation
Valve is hand stop valve.
First regulating valve, the second regulating valve, third regulating valve, the first isolating valve, the second isolating valve, third isolation
The specifications and models of valve are PN4.0DN32.
It is had the beneficial effect that acquired by the utility model
The utility model takes full advantage of during original system operation existing pressure difference between each component, using in main feed pump
The mode of pressure pipeline impulse effectively reduces restriction loss and influences on pipeline erosion, and device is simple and reliable, safe and practical, and
Have both multi-functional.
The utility model device is in 4 unit successful applications of Qinshan Second Nuclear Power Plant at present, then identifies and check and accept situation
Qualification, correlated performance fully meet design requirement, and operating status is good.
It is put into operation from the point of view of the operation data of accumulation, is worked well for a long time according to the device.Stand-by pump and its attachment tube before improving
Line water temperature is at 25 DEG C~40 DEG C or so；Improved 137 DEG C of main feed pump fore pump inlet water temperature, with oxygen-eliminating device water temperature inside
140 DEG C close.Pipe insulating layer is dismantled, 130 DEG C of fore pump ontology is measured with point Wen Yi, 135 DEG C of pipeline water temperature is bridged, with operation
The water temperature of the pump housing is consistent.After adding utility model device, main feed pump does not need to carry out warming-up operation during normally switching.The Qin two
No. 4 units of factory are mounted with the novel practical device during overhaul in 2014, during unit Operation at full power, electronic main water supply
Pump is because fastener failure occurs jumping pump, and stand-by pump emergency start, during which carbonated drink pressure difference slight fluctuations, non-generation system disturb, evaporation
Device water level is normal, does not generate removal of load signal, and system run all right demonstrates the reliability and reality of the new device indirectly
With property, which stands long-term running test.
Detailed description of the invention
Fig. 1 is to reduce main feed pump promptly to switch structure drawing of device to nuclear power unit transient effect；
In figure: 1, the first impulse pipeline；2, the second impulse pipeline；3, third impulse pipeline；4, the first regulating valve；5, second
Regulating valve；6, third regulating valve；7, the first isolating valve；8, the second isolating valve；9, third isolating valve；10, connecting pipeline；11,
Water-supply line is pressed in one；12, water-supply line is pressed in second；13, water-supply line is pressed in third.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, reduction main feed pump described in the utility model promptly switches the device to nuclear power unit transient effect
Including the first impulse pipeline 1, the second impulse pipeline 2, third impulse pipeline 3, the first regulating valve 4, the second regulating valve 5, third tune
Save valve 6, the first isolating valve 7, the second isolating valve 8, third isolating valve 9 and connecting pipeline 10；
One end of first impulse pipeline 1 presses water-supply line 11 to connect with the first of the first main feed pump, the second pressure guiding pipe
Water-supply line 12 is pressed to connect in one end of line 2 and the second of the second main feed pump, one end and the third master of third impulse pipeline 3 give
Water-supply line 13 is pressed to connect in the third of water pump；First impulse pipeline 1, the second impulse pipeline 2 and third impulse pipeline 3 it is another
End is linked together by connecting pipeline 10；The first regulating valve 4 and the first isolating valve 7 are disposed on first impulse pipeline 1,
It is disposed with the second regulating valve 5 and the second isolating valve 8 on second impulse pipeline 2, is disposed on third impulse pipeline 3
Three regulating valves 6 and third isolating valve 9.
Consider that the flow velocity of the medium in pipeline is high, flow is big, longtime running is also easy to produce flowing accelerated corrosion (FAC), described
The first impulse pipeline 1, the second impulse pipeline 2, third impulse pipeline 3 material select 304L stainless steel, specification is
Φ42.2×4.85；First regulating valve 4, the second regulating valve 5, third regulating valve 6, the first isolating valve 7, the second isolating valve
8, third isolating valve 9 is hand stop valve, specifications and models PN4.0DN32.
Assuming that certain nuclear power unit is in normal power operation, the first main feed pump and the operation of the second main feed pump at this time, the
Three main feed pumps are spare.Pressing in water-supply line 11, second in first at this time presses the pressure in water-supply line 12 to be apparently higher than third
Middle pressure water-supply line 13, then the high temperature water-supply in main feed pump system (140 DEG C or so) respectively by the first impulse pipeline 1 and
Second impulse pipeline 2 flows to third impulse pipeline 3 (arrow direction as shown in figure 1), subsequently into third press water-supply line 13, into
Enter in third press water-supply line 13 high temperature water-supply be divided into two-way to third main feed pump fore pump, main feed pump pressure stage pump and
In its attached pipeline.According to this operation logic, keep in spare main feed pump and its attached pipeline for a long time feed temperature with
The feed temperature of operation pump is consistent, and reduces the transient effect that main feed pump promptly switches the system that brings.
Preferred embodiment 1: impulse point is dexterously chosen
In by the way of pressure pipeline impulse, effectively reduces restriction loss and pipeline erosion is influenced.If from low pressure
Pipeline impulse can not be successfully since pressure is low and establish water circulation；If from high pressure line impulse, since water flow is from high pressure side to low pressure
Side flowing, need to increase restricting orifice, orifice plate downstream line and valve are highly susceptible to erosion after shut-off valve.Certain domestic nuclear power plant
Using the scheme from high pressure line impulse, longtime running causes warming-up conduit wiring piercing leak, and reason is exactly pressure drop before and after orifice plate
Greatly, it causes caused by cavitation.
Preferred embodiment 2: device Optimization of material selection
It is carbon steel that water-supply line material is pressed in Qinshan Second Nuclear Power Plant main feed pump, and interior media flow velocity is high, flow is big, long
Phase operation is also easy to produce flowing accelerated corrosion (FAC).The utility model device selects corrosion resistance and mechanical property and excellent 304L not
Steel become rusty as pipeline material, pipe thickness 4.85mm, the three column fairlead congruences are at a mutual warming-up heating coil of main pipe progress, effectively
Reduce equipment corrosion, avoids line clogging.
Preferred embodiment 3: it is adjusted convenient for isolation of system and flow
The present apparatus cleverly sets the shut-off valve of 6 stainless steel materials, wherein twice valve is arranged on every impulse pipeline
Door, wherein valve (4,5,6) is used as regulating valve, after newly-increased device installation, adjusts flow according to running situation,
Throttling operation；Valve (7,8,9) is used as isolating valve, convenient for original system or device isolation maintenance, i.e., in any one main water supply of column
Pump breaks down, and can carry out isolation maintenance to failure column by closing the valve, the fortune without influencing other column main feed water pipe lines
Row.
Preferred embodiment 4: device is simple and reliable, safe and practical, and has both multi-functional.
Whole device main component uses only 6 valves and 4 depot sidings, and improvement cost is greatly saved, not only can be with
It prevents the cold water in spare main feed pump circuit from flowing through high plus leading to stopping HP heater transient state, also reduces spare main feed pump starting
When the thermal shock that is subjected to, reduce heating coil time when main feed pump normally starts, it is therefore prevented that steam generator water after pump startup
Qualitative change is poor.
The safe and stable operation of nuclear power plant's main feed system is the essential condition for guaranteeing entire npp safety stable operation
One of.The utility model device of two factory, the Qin significantly reduces main feed pump and promptly switches transient effect to unit, for core
The safe and stable operation of power plant has particularly important meaning, while having the important valence for being generalized to other same type nuclear power units
Value.
Claims (5)
1. a kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect, it is characterised in that: draw including first
Pressure pipeline, the second impulse pipeline, third impulse pipeline, the first regulating valve, the second regulating valve, third regulating valve, the first isolating valve,
Second isolating valve, third isolating valve and connecting pipeline；It presses and gives in one end of first impulse pipeline and the first of the first main feed pump
Water pipeline connection, one end of the second impulse pipeline press water-supply line to connect with the second of the second main feed pump, third pressure guiding pipe
Water-supply line is pressed to connect with the third of third main feed pump in one end of line；First impulse pipeline, the second impulse pipeline and third
The other end of impulse pipeline is linked together by connecting pipeline；The first regulating valve and are disposed on first impulse pipeline
One isolating valve is disposed with the second regulating valve and the second isolating valve on the second impulse pipeline, successively sets on third impulse pipeline
It is equipped with third regulating valve and third isolating valve.
2. reduction main feed pump according to claim 1 promptly switches the device to nuclear power unit transient effect, feature
Be: the first impulse pipeline, the second impulse pipeline, third impulse pipeline material select 304L stainless steel.
3. reduction main feed pump according to claim 2 promptly switches the device to nuclear power unit transient effect, feature
Be: the first impulse pipeline, the second impulse pipeline, third impulse pipeline specification be Φ 42.2 × 4.85.
4. reduction main feed pump according to claim 1 promptly switches the device to nuclear power unit transient effect, feature
It is: first regulating valve, the second regulating valve, third regulating valve, the first isolating valve, the second isolating valve, third isolating valve
It is hand stop valve.
5. reduction main feed pump according to claim 4 promptly switches the device to nuclear power unit transient effect, feature
It is: first regulating valve, the second regulating valve, third regulating valve, the first isolating valve, the second isolating valve, third isolating valve
Specifications and models be PN4.0DN32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822191696.7U CN209525934U (en) | 2018-12-25 | 2018-12-25 | A kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822191696.7U CN209525934U (en) | 2018-12-25 | 2018-12-25 | A kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209525934U true CN209525934U (en) | 2019-10-22 |
Family
ID=68227346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822191696.7U Active CN209525934U (en) | 2018-12-25 | 2018-12-25 | A kind of reduction main feed pump promptly switches the device to nuclear power unit transient effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209525934U (en) |
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2018
- 2018-12-25 CN CN201822191696.7U patent/CN209525934U/en active Active
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