CN117079844A - Electric solid oxygen control and regulation system for lead-based fast reactor - Google Patents
Electric solid oxygen control and regulation system for lead-based fast reactor Download PDFInfo
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- CN117079844A CN117079844A CN202311042866.4A CN202311042866A CN117079844A CN 117079844 A CN117079844 A CN 117079844A CN 202311042866 A CN202311042866 A CN 202311042866A CN 117079844 A CN117079844 A CN 117079844A
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- liquid lead
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 124
- 239000001301 oxygen Substances 0.000 title claims abstract description 124
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000007787 solid Substances 0.000 title claims abstract description 62
- 230000033228 biological regulation Effects 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 114
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 102
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000008188 pellet Substances 0.000 claims abstract description 46
- 229910000464 lead oxide Inorganic materials 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 33
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000004090 dissolution Methods 0.000 claims abstract description 29
- 239000011224 oxide ceramic Substances 0.000 claims abstract description 26
- 239000011148 porous material Substances 0.000 claims abstract description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005342 ion exchange Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 230000001502 supplementing effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- 230000017525 heat dissipation Effects 0.000 claims description 6
- -1 oxygen ion Chemical class 0.000 description 12
- 229910001152 Bi alloy Inorganic materials 0.000 description 10
- 239000012530 fluid Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 238000006213 oxygenation reaction Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/28—Selection of specific coolants ; Additions to the reactor coolants, e.g. against moderator corrosion
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention discloses a lead-based fast reactor electric solid oxygen control and regulation system, which belongs to the technical field of control of lead-based fast reactors of nuclear power plants, and particularly relates to a lead-based fast reactor electric solid oxygen control and regulation system, comprising: liquid lead bismuth flow pipeline, solid oxygen source replenishing device and liquid level control system. The liquid lead bismuth flow conduit comprises: the device comprises a loop inflow pipeline, a loop pipeline sudden expansion bent pipe, a vertical pipeline dissolution cavity, a loop outflow pipeline, a charging barrel isolation cavity and an electric valve; the solid oxygen source replenishing device comprises: the device comprises a motor, a fixed flange, a screw sleeve, a threaded connection structure, a screw, ribs, a charging barrel upper pore plate, a charging barrel lower pore plate, a charging barrel upper pore plate locking hole, an alumina pellet, a lead oxide ceramic pellet and a charging barrel isolation cavity. After passing through the loop inflow pipeline, the loop pipeline sudden expansion bent pipe and the vertical pipeline dissolution cavity in sequence, the liquid lead bismuth in the liquid lead bismuth flow pipeline is subjected to oxygen ion exchange with the charging barrel, and enters a downstream system from the loop outflow pipeline, so that the solid oxygen controlled oxygen ion exchange is realized.
Description
Technical Field
The invention belongs to the technical field of control of a lead-based fast reactor of a nuclear power plant, and particularly relates to an electric solid oxygen control and regulation system of the lead-based fast reactor.
Background
The lead-bismuth alloy has unique advantages as a lead-based cooling reactor, for example, the lead-bismuth alloy has high boiling point, and can effectively improve the outlet temperature of a reactor coolant, thereby improving the economy; the volume change of the lead-bismuth alloy is very small when the temperature in the reactor changes, so that the damage to materials can be reduced; when the lead bismuth alloy is used as a reactor coolant, the system can operate at normal pressure, the pressure-bearing requirement on materials is low, and the safety of the system is ensured. However, during operation of a lead-based cooled reactor, dissolution corrosion of the lead-bismuth alloy to structural materials or piping occurs, which can seriously affect safe operation of the reactor.
The main solutions to the corrosion problem at present are two methods, namely surface coating protection and oxygen concentration control in the loop. Surface coating protection is to protect the material by surface coating technology or surface alloying; the oxygen concentration in the control loop is controlled to inhibit the corrosion rate of the loop by controlling the concentration of oxygen in the operating loop to produce an oxide film. Under the operating condition of the reactor, the oxygen concentration of the loop has a certain range requirement, when the oxygen concentration is too low, dissolution corrosion of metal materials can occur, and when the oxygen concentration is too high, precipitation of metal oxides can occur, so that the pipeline is blocked. Therefore, it is necessary to dynamically adjust the oxygen concentration in the circuit so as to control the oxygen concentration in the operating region where the oxide film is stably formed. The solid oxygen control belongs to the mode, and the liquid lead bismuth system is rapidly oxygenated by adjusting the dissolution rate of the solid lead oxide ceramic pellets, so that the method has the multiple advantages of high efficiency, rapidness, no residue and the like in oxygen concentration adjustment.
In the prior art, there are technical solutions for realizing the adjustment of the oxygen concentration in a loop by means of solid-state oxygen control, for example: the file number is CN115331847A, and the Chinese patent document entitled "liquid lead bismuth solid oxygen control ion exchanger" discloses a liquid lead bismuth solid oxygen control ion exchanger, which comprises a main loop pipeline, a bypass pipeline, an electric valve, a heater, a vertical pipeline, an isolation cavity, a charging cavity, a slide bar, a fixed flange, a sealing flange, a charging barrel, lead oxide ceramic pellets and other parts. According to the scheme, the dissolution rate of the lead oxide ceramic pellets is controlled by adjusting the flow rate of liquid lead bismuth fluid of the bypass pipeline and the temperature of the liquid lead bismuth of the charging cavity, so that the purpose of adjusting the concentration of dissolved oxygen of the liquid lead bismuth is achieved, and solid oxygen control is realized. However, because not all liquid lead bismuth fluids participate in oxygen ion exchange and manual adjustment of the slide bar is required, there are limitations in the efficiency and accuracy of oxygen control. Therefore, there is a need for an electric solid-state oxygen control and regulation system for a lead-based fast reactor, which can dynamically adjust the oxygen concentration in a loop efficiently and accurately so as to control the oxygen concentration in a working area where an oxide film is stably generated.
Disclosure of Invention
The invention aims to provide an electric solid-state oxygen control regulating system of a lead-based fast reactor, which is characterized by comprising the following components:
a liquid lead bismuth flow pipeline, a solid oxygen source supplementing device and a liquid level control system; the liquid level control system comprises an electric valve and a sealing flange, wherein an outlet of the electric valve is in sealing connection with an inlet of a charging barrel isolation cavity of the solid oxygen source supplementing device through the sealing flange, and an inlet of the electric valve is connected with an outlet of a vertical pipeline dissolution cavity of the liquid lead bismuth flow pipeline; the vertical pipeline dissolving cavity and the charging barrel isolating cavity are arranged perpendicular to the horizontal plane;
the liquid lead bismuth flow conduit comprises: a loop inflow pipe, a loop pipe sudden expansion elbow, a vertical pipe dissolution cavity and a loop outflow pipe; the loop inflow pipeline, the loop pipeline sudden expansion bent pipe and the vertical pipeline dissolving cavity are sequentially connected, the loop inflow pipeline is connected with an inlet of liquid lead bismuth, a loop outflow pipeline is arranged on the side wall of the outlet side of the vertical pipeline dissolving cavity, and the loop outflow pipeline is connected with a downstream system;
and a heating wire for controlling the temperature of the liquid lead bismuth is arranged outside the side wall of the inlet side of the vertical pipeline dissolution cavity.
The solid oxygen source replenishing device comprises: the device comprises a motor, a motor fixing flange, a screw sleeve, a threaded connection structure, a screw, a charging barrel, an alumina pellet, a lead oxide ceramic pellet and a charging barrel isolation cavity; the motor is fixed with one end face of the motor fixing flange in a sealing way, the other end face of the motor fixing flange is fixed with the charging barrel isolating cavity in a sealing way through the isolating cavity flange, and a power output shaft of the motor is fixedly connected with the screw sleeve; the screw sleeve is fixed with the threaded connection structure, the threaded connection structure is in threaded fit with the screw, the charging barrel is installed at the lower end of the screw, and the screw and the charging barrel are driven to lift through rotation of the motor.
And a fin for heat dissipation is arranged outside the side wall of the inlet side of the charging barrel isolation cavity.
The filled alumina pellets and the lead oxide ceramic pellets form a filled pellet bed in a charging barrel, the charging barrel comprising: the upper pore plate of the charging barrel and the lower pore plate of the charging barrel are respectively fixedly arranged outside the upper end face and the lower end face of the barrel wall; wherein the upper pore plate of the charging barrel and the lower pore plate of the charging barrel are filter plates with openings of 4mm and are used for fixing the filling ball bed in the charging barrel.
The invention also discloses a solid oxygen control regulating method of the lead-based fast reactor electric solid oxygen control regulating system, which is characterized in that an oxygen ion concentration sensor of the lead-based fast reactor electric solid oxygen control regulating system monitors the oxygen ion concentration in a liquid lead bismuth flow pipeline in real time; the method comprises the following steps:
liquid lead bismuth sequentially enters a loop inflow pipeline, a loop pipeline sudden expansion bent pipe and a vertical pipeline dissolution cavity, and then enters a downstream system through a loop outflow pipeline;
the motor drives the screw rod to move the charging barrel into the charging barrel isolation cavity, the electric valve is closed, and the charging barrel is isolated from the liquid lead bismuth;
when the oxygen ion concentration in the liquid lead bismuth flow pipeline is smaller than the first preset concentration:
starting a heating wire to heat liquid lead bismuth in a vertical pipeline dissolution cavity;
the opening of the electric valve is regulated, and a motor drives a screw rod to insert a charging barrel into a vertical pipeline dissolving cavity of the liquid lead bismuth flow pipeline;
the heated liquid lead bismuth flows through a vertical pipeline dissolution cavity to dissolve lead oxide ceramic pellets in a charging barrel, and lead oxide enters a downstream liquid lead bismuth system to realize solid oxygen-controlled oxygen ion exchange of the liquid lead bismuth;
when the oxygen ion concentration in the liquid lead bismuth flow pipeline is larger than the second preset concentration:
the motor drives the screw rod to enable the charging barrel to move upwards to the charging barrel isolation cavity, the electric valve is closed, and the charging barrel is isolated from the liquid lead bismuth.
The invention has the beneficial effects that:
the invention discloses a lead-based fast reactor electric solid oxygen control regulating system, which is based on a solid oxygen control principle, supplements oxygen ions through dissolution of lead oxide ceramic pellets, dynamically adjusts the oxygen concentration in a loop, enables the oxygen concentration to be controlled in a working area where an oxide film is stably generated, prevents dissolution corrosion of lead-bismuth alloy to structural materials or pipelines, ensures safe operation of a reactor, and has the advantages of high efficiency, high speed, simplicity, easiness in operation, low maintenance cost and high response speed. The oxygen concentration in the lead bismuth loop can be rapidly controlled, the solid oxygen source is isolated from the liquid lead bismuth fluid by automatic adjustment after oxygenation is finished, the pollution of the environment to the liquid lead bismuth system is effectively prevented, and the long-term stable and safe operation of the loop is ensured.
Drawings
FIG. 1 is a schematic diagram of an electrically powered solid state oxygen control adjustment system for a lead-based fast reactor in accordance with the present invention;
FIG. 2 is a schematic diagram of an electrically powered solid state oxygen control adjustment system for a lead-based fast reactor in accordance with the present invention;
FIG. 3 is a schematic diagram of the structure of the supplemental components of the solid oxygen source of the lead-based fast reactor electric solid oxygen control regulation system of the present invention;
wherein: the device comprises a 1-motor, a 2-motor fixing flange, a 3-screw sleeve, a 4-threaded connection structure, a 5-screw, a 6-charging barrel, a 7-isolation cavity flange, an 8-charging barrel isolation cavity, 9-ribs, a 10-sealing flange, a 12-electric valve, a 13-loop outflow pipeline, a 14-heating wire, a 15-loop pipeline sudden expansion elbow pipe, a 16-loop inflow pipeline, a 17-vertical pipeline dissolution cavity, an 18-charging barrel upper pore plate, a 19-alumina pellet, a 20-charging barrel lower pore plate and a 21-lead oxide ceramic pellet.
Detailed Description
The invention provides a lead-based fast reactor electric solid oxygen control adjusting system, which is further described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the invention discloses a lead-based fast reactor electric solid-state oxygen control regulating system, which comprises: a liquid lead bismuth flow pipeline, a solid oxygen source supplementing device and a liquid level control system; the liquid level control system comprises an electric valve 12 and a sealing flange 10, wherein an outlet of the electric valve 12 is in sealing connection with an inlet of a charging barrel isolation cavity 8 of the solid oxygen source supplementing device through the sealing flange 10, and an inlet of the electric valve 12 is connected with an outlet of a vertical pipeline dissolution cavity 17 of a liquid lead bismuth flow pipeline; the vertical pipeline dissolving cavity 17 and the charging barrel isolation cavity 8 are arranged perpendicular to the horizontal plane;
the liquid lead bismuth flow conduit comprises: a loop inflow conduit 16, a loop conduit flare elbow 15, a vertical conduit dissolution chamber 17 and a loop outflow conduit 13; the loop inflow pipeline 16, the loop pipeline sudden expansion bent pipe 15 and the vertical pipeline dissolving cavity 17 are sequentially connected, the loop inflow pipeline 16 is connected with an inlet of liquid lead bismuth, a loop outflow pipeline 13 is arranged on the side wall of the outlet side of the vertical pipeline dissolving cavity 17, and the loop outflow pipeline 13 is connected with a downstream system;
in this embodiment, the liquid lead bismuth flow path in the liquid lead bismuth flow pipeline is that the liquid lead bismuth flow path firstly enters the loop inflow pipeline 16 and then enters the loop pipeline sudden expansion elbow 15, then enters the vertical pipeline dissolving cavity 17, and flows into the loop outflow pipeline 13 and enters the downstream system;
a heating wire 14 for controlling the temperature of the liquid lead bismuth is arranged outside the side wall of the inlet side of the vertical pipeline dissolving cavity 17;
the higher the temperature of the liquid lead bismuth flowing through the packed bed of lead oxide ceramic pellets 21, the greater the dissolution rate, so that the temperature of the liquid lead bismuth can be raised by the heating wire 14 to increase the oxygenation rate of the liquid lead bismuth system.
The solid oxygen source replenishing device comprises: the device comprises a motor 1, a motor fixing flange 2, a screw sleeve 3, a threaded connection structure 4, a screw 5, a charging barrel 6, alumina pellets 19, lead oxide ceramic pellets 21 and a charging barrel isolation cavity 8; the motor 1 is fixed with one end face of the motor fixing flange 2 in a sealing way, the other end face of the motor fixing flange 2 is fixed with a charging barrel isolating cavity 8 in a sealing way through an isolating cavity flange 7, and a power output shaft of the motor 1 is fixedly connected with the screw sleeve 3; the screw sleeve 3 is fixed with the threaded connection structure 4, the threaded connection structure 4 is in threaded fit with the screw 5, the charging barrel 6 is arranged at the lower end of the screw 5, and the screw 5 and the charging barrel 6 are driven to lift through the rotation of the motor 1;
in this embodiment, the edge and middle perforation of the motor fixing flange 2 of the solid oxygen source supplementing device are used for welding the motor 1 to the edge perforation of the motor fixing flange 2, the upper end of the screw sleeve 3 passes through the middle perforation of the motor fixing flange 2 to be connected with the motor 1, the upper end of the screw 5 is screwed into the threaded connection structure 4 and extends into the screw sleeve 3, the lower end of the screw 5 passes through the charging barrel upper pore plate 18 of the charging barrel 6 to be welded, and the motor 1 rotates to drive the screw 5 to lift.
In the embodiment, the motor 1 controls the charging barrel 6 to act more accurately, and the motor is connected to a terminal for automatic control. The motor drives the charging barrel to lift, and the reaction time of the lead oxide pellets is controlled by controlling the immersion time of the charging barrel in the liquid lead bismuth, so that the oxygen concentration of the liquid lead bismuth is controlled more accurately.
A fin 9 for heat dissipation is arranged outside the side wall of the inlet side of the charging barrel isolation cavity 8;
in this embodiment, the rib 9 is fixed outside the charging barrel isolation cavity 8 for heat dissipation, the charging barrel 6 stretches into the vertical pipeline dissolution cavity 17 during oxygenation, the heated fluid is immersed, after oxygenation is finished, the charging barrel 6 has waste heat, heat dissipation is achieved through the rib, the device is prevented from being in high temperature for a long time, and the service performance and service life of the device can be effectively prolonged.
The packed alumina pellets 19 and lead oxide ceramic pellets 21 form a packed ball bed within the charging barrel 6, the charging barrel 6 comprising: the barrel wall, the upper orifice plate 18 of the charging barrel and the lower orifice plate 20 of the charging barrel are respectively fixedly arranged outside the upper end face and the lower end face of the barrel wall; wherein the upper pore plate 18 and the lower pore plate 20 of the charging barrel are filter plates with openings of 4mm and are used for fixing the packed ball bed in the charging barrel 6.
In this embodiment, the charging basket 6 is used for filling small balls 19 of alumina and small balls 21 of lead oxide, after the charging basket 6 is filled with the small balls to form a filled ball bed, the upper pore plate 18 of the charging basket is locked by nuts, and the lower pore plate 20 of the charging basket fixes the filled ball bed in the charging basket 6; the lead oxide ceramic pellets 21 are the solid source of oxygen for the liquid lead bismuth system.
In an alternative embodiment, when the charging bucket 6 is filled with the alumina pellets 19 and the lead oxide ceramic pellets 21, the alumina pellets 19, the lead oxide ceramic pellets 21 and the alumina pellets 19 are filled in the order of filling the alumina pellets 19, filling the lead oxide ceramic pellets 21 and refilling the alumina pellets 19, that is, the alumina pellets 21 are required to be in the middle of the filled pellet bed in the charging bucket 6, in this embodiment, the alumina pellets 19 are insoluble in liquid lead bismuth, and the alumina pellet bed plays a role of filtering to prevent the lead oxide ceramic pellets 21 from entering the liquid lead bismuth system after being dissolved and reduced.
In this embodiment, when the liquid lead bismuth flow pipeline is installed in the liquid lead bismuth loop, the loop pipeline sudden expansion elbow 15 is upstream, the loop outflow pipeline 13 is downstream, the vertical pipeline dissolving cavity 17 and the charging barrel isolation cavity 8 are installed perpendicular to the horizontal plane, the direction of the charging barrel isolation cavity 8 is consistent with the gravity direction, and the electric valve 12 controls the liquid lead bismuth liquid level to pass through the loop outflow pipeline 13 and not reach the charging barrel isolation cavity 8. In the liquid lead bismuth flow pipeline, a charging barrel 6 is connected with a vertical pipeline dissolving cavity 17 through an electric valve 12 in an injection and recovery channel for supplying oxygen ions in the liquid lead bismuth flow.
In this embodiment, the electric valve 12 is used as an execution unit of the liquid level control system, the electric valve 12 controls the liquid level of the liquid lead bismuth flowing through the vertical pipeline dissolution cavity 17 by adjusting the opening degree, when the lead oxide ceramic pellets 21 are required to be dissolved, the electric valve 12 is opened, the charging basket 6 enters the vertical pipeline dissolution cavity 17 to perform oxygen ion exchange, when the solid oxygen source supplementing device does not need to work, the electric valve 12 is closed, the electric valve 12 and the sealing flange 10 are controlled in a combined way, so that the liquid lead bismuth level is lower than the charging basket isolation cavity 8, and all flows into the loop outflow pipeline 13 to achieve the isolation effect, thereby effectively preventing the environment from polluting the liquid lead bismuth system.
The motor 1 in the solid oxygen source supplementing device provides power for lifting of the charging barrel, the pump body of the motor 1 is cooled by forced air, the requirement of the highest running temperature of 450 ℃ can be met, the sliding rod 5 is automatically controlled to stretch and retract, the charging barrel 6 is inserted into the vertical pipeline dissolving cavity 17 of the liquid lead bismuth flow pipeline, and the oxygen ion exchange rate is controlled by controlling the time of the charging barrel 6 in the vertical pipeline dissolving cavity 17. When the oxygen ion exchange is finished, the charging basket 6 is retracted to the charging basket isolation cavity 8, and the ribs 9 radiate heat for the charging basket isolation cavity 8, so that the service performance and the service life of the device are effectively prolonged.
The invention also discloses a solid oxygen control regulating method of the lead-based fast reactor electric solid oxygen control regulating system, wherein an oxygen ion concentration sensor of the lead-based fast reactor electric solid oxygen control regulating system monitors the oxygen ion concentration in a liquid lead bismuth flow pipeline in real time; the method comprises the following steps:
liquid lead bismuth sequentially enters a loop inflow pipeline 16, a loop pipeline sudden expansion bent pipe 15 and a vertical pipeline dissolving cavity 17, and then enters a downstream system through a loop outflow pipeline 13;
the motor 1 drives the screw 5 to move the charging barrel 6 into the charging barrel isolation cavity 8, the electric valve 12 is closed, and the charging barrel 6 is isolated from liquid lead bismuth;
when the oxygen ion concentration in the liquid lead bismuth flow pipeline is smaller than the first preset concentration:
starting a heating wire 14 to heat liquid lead bismuth in a vertical pipeline dissolving cavity 17;
the opening of the electric valve 12 is regulated, and the motor 1 drives the screw 5 to insert the charging barrel 6 into the vertical pipeline dissolving cavity 17 of the liquid lead bismuth flow pipeline;
the heated liquid lead bismuth flows through a vertical pipeline dissolution cavity 17 to dissolve lead oxide ceramic pellets in a charging barrel 6, and lead oxide enters a downstream liquid lead bismuth system to realize solid oxygen-controlled oxygen ion exchange of the liquid lead bismuth;
when the oxygen ion concentration in the liquid lead bismuth flow pipeline is larger than the second preset concentration:
the motor 1 drives the screw 5 to enable the charging barrel 6 to move upwards to the charging barrel isolation cavity 8, the electric valve 12 is closed, and the charging barrel 6 is isolated from liquid lead bismuth.
In this embodiment, the first preset concentration and the second preset concentration may be flexibly set according to specific working conditions, which is not specifically limited herein.
In this embodiment, when the solid oxygen source replenishing device works, that is, when the concentration of oxygen ions in the liquid lead bismuth flow pipeline is smaller than the first preset concentration, the electric valve 12 is opened, the motor 1 drives the screw 5 to insert the charging barrel 6 into the vertical pipeline dissolving cavity 17 of the liquid lead bismuth flow pipeline, and when high-temperature liquid lead bismuth flows through the vertical pipeline dissolving cavity 17, the lead oxide ceramic pellets in the charging barrel 6 are dissolved, and lead oxide enters a downstream liquid lead bismuth system to realize solid oxygen-controlled ion exchange of the liquid lead bismuth. In the embodiment, as all liquid lead bismuth is put into the vertical pipeline dissolution cavity, the oxygen ion exchange efficiency can be improved, and the oxygen concentration can be controlled more accurately and directly.
In this embodiment, when the solid oxygen source supplementing device does not need to work, that is, when the oxygen ion concentration in the liquid lead bismuth flowing pipeline is greater than the second preset concentration, the motor 1 drives the screw 5 to enable the charging barrel 6 to move upwards to the charging barrel isolation cavity 8, at this time, the charging barrel 6 filled with the alumina pellets 19 and the lead oxide ceramic pellets 21 leaves the liquid lead bismuth fluid, the electric valve 12 is closed, the effect of isolating the charging barrel from the liquid lead bismuth alloy is achieved, the whole process is automatically completed by the electric valve and the motor drive, no manual operation is needed, the efficiency of solid oxygen control is effectively improved, and the pollution of the environment to the liquid lead bismuth system is prevented.
FIG. 2 is a schematic diagram of an electric solid-state oxygen control regulating system of a lead-based fast reactor, wherein the temperature of liquid lead bismuth flowing in a bent pipe of a solid-state oxygen control ion exchanger is T as shown in FIG. 2 0 Oxygen concentration of C 0 Flushing lead oxide ceramic pellets when flowing into pipeline filling ball bedSimultaneously, the heater on the outer wall surface of the dissolution cavity pipeline is heated to control the dissolution of the lead oxide, and the downstream of the ball bed flows out of the pipeline to obtain the temperature T 1 Oxygen concentration of C 2 Thereby achieving the purpose of adjusting the oxygen concentration in the liquid lead bismuth alloy.
Fig. 3 is a schematic structural diagram of a solid oxygen source supplementing component of the lead-based fast reactor electric solid oxygen control regulating system, as shown in fig. 3, a charging barrel upper pore plate 18 and a charging barrel lower pore plate 20 of a charging barrel 6 in the solid oxygen source supplementing device are filter plates with openings of 4mm, the filter plates are used for fixing the shape of a filling ball bed in the charging barrel 6, a lead oxide ceramic ball 21 is a solid oxygen source of a liquid lead bismuth system, the lower end of a screw 5 penetrates through the charging barrel upper pore plate 18 of the charging barrel 6 to be welded, the upper end of the screw 5 is screwed into a threaded connection structure 4 and extends into a screw sleeve 3, the upper end of the screw sleeve 3 is connected with a motor 1, the motor 1 rotates to drive the screw 5, the charging barrel 6 is controlled to lift, and a rib 9 is fixed on the outer side of a charging barrel isolation cavity 8 for heat dissipation.
In summary, compared with the existing solid oxygen control technical scheme, the disclosed lead-based fast reactor electric solid oxygen control regulating system can throw all liquid lead bismuth into the vertical pipeline dissolving cavity 17 through the structural design of the liquid lead bismuth flow pipeline, so that the oxygen ion exchange efficiency is improved, and the oxygen concentration is controlled more accurately and directly; the motor 1 is arranged to drive the screw 5 to accurately and efficiently lift and lower the charging barrel 6, and the reaction time of the lead oxide pellets is controlled by controlling the immersion time of the charging barrel 6 in the liquid lead bismuth, so that the oxygen concentration of the liquid lead bismuth is controlled more accurately and efficiently; the solid oxygen source is isolated from liquid lead bismuth fluid through the electric valve 12, and the sealing flange 10 and the manual operation screw 5 are not required to be opened, so that the safety and reliability are improved; the charging barrel isolation cavity 8 is arranged to effectively prevent the pollution of the external environment to the liquid lead bismuth system after the oxygen control is finished. The invention can automatically drive and adjust the dissolved oxygen concentration of the liquid lead bismuth alloy coolant system, provides a new method for controlling the oxygen concentration of the liquid lead bismuth alloy coolant system, and improves the oxygen control efficiency by completely participating in oxygen ion exchange of the liquid lead bismuth fluid; the automatic control of the motor is more accurate and rapid compared with manual operation of the charging barrel; the isolation cavity is arranged, and pollution of the external environment to the liquid lead bismuth system is effectively prevented after oxygen control is finished. And support is provided for realizing long-term stable and safe operation of the lead-bismuth loop.
Claims (6)
1. A lead-based fast reactor electrically powered solid state oxygen control regulation system comprising: a liquid lead bismuth flow pipeline, a solid oxygen source supplementing device and a liquid level control system; the liquid level control system comprises an electric valve (12) and a sealing flange (10), wherein an outlet of the electric valve (12) is connected with an inlet of a charging barrel isolation cavity (8) of the solid oxygen source supplementing device in a sealing way through the sealing flange (10), and an inlet of the electric valve (12) is connected with an outlet of a vertical pipeline dissolution cavity (17) of the liquid lead bismuth flow pipeline; the vertical pipeline dissolving cavity (17) and the charging barrel isolating cavity (8) are arranged perpendicular to the horizontal plane;
the liquid lead bismuth flow conduit comprises: a loop inflow pipe (16), a loop pipe sudden expansion elbow (15), a vertical pipe dissolving cavity (17) and a loop outflow pipe (13); the loop inflow pipeline (16), the loop pipeline sudden expansion bent pipe (15) and the vertical pipeline dissolution cavity (17) are sequentially connected, the loop inflow pipeline (16) is connected with an inlet of liquid lead bismuth, a loop outflow pipeline (13) is arranged on the side wall of the outlet side of the vertical pipeline dissolution cavity (17), and the loop outflow pipeline (13) is connected with a downstream system.
2. The lead-based fast reactor electric solid oxygen control regulation system according to claim 1, wherein a heating wire (14) for controlling the temperature of liquid lead bismuth is installed outside the side wall of the inlet side of the vertical pipeline dissolution chamber (17).
3. The lead-based fast reactor electrically operated solid state oxygen control regulation system of claim 1, wherein the solid state oxygen source replenishment device comprises: the device comprises a motor (1), a motor fixing flange (2), a screw sleeve (3), a threaded connection structure (4), a screw (5), a charging barrel (6), alumina pellets (19), lead oxide ceramic pellets (21) and a charging barrel isolation cavity (8); the motor (1) is fixed with one end face of the motor fixing flange (2) in a sealing way, the other end face of the motor fixing flange (2) is fixed with a charging barrel isolating cavity (8) in a sealing way through an isolating cavity flange (7), and a power output shaft of the motor (1) is fixedly connected with the screw sleeve (3); screw sleeve (3) is fixed with threaded connection structure (4), threaded connection structure (4) and screw rod (5) screw thread fit, and charging basket (6) are installed to the lower extreme of screw rod (5), drive screw rod (5) and charging basket (6) through the rotation of motor (1) and go up and down.
4. The lead-based fast reactor electric solid oxygen control regulation system according to claim 1, wherein a fin (9) for heat dissipation is installed outside the side wall of the inlet side of the charging barrel isolation cavity (8).
5. A lead-based fast reactor electrically operated solid state oxygen control adjustment system according to claim 3, wherein the packed alumina pellets (19) and lead oxide ceramic pellets (21) form a packed sphere bed within a charging bucket (6), the charging bucket (6) comprising: the charging barrel upper pore plate (18) and the charging barrel lower pore plate (20) are respectively fixedly arranged outside the upper end face and the lower end face of the barrel wall; wherein the upper pore plate (18) and the lower pore plate (20) of the charging barrel are filter plates with openings of 4mm and are used for fixing the filling ball bed in the charging barrel (6).
6. A method for controlling and regulating solid oxygen of a lead-based fast reactor electric solid oxygen control regulating system according to claim 1, wherein an oxygen ion concentration sensor of the lead-based fast reactor electric solid oxygen control regulating system monitors the oxygen ion concentration in a liquid lead bismuth flow pipeline in real time; the method comprises the following steps:
liquid lead bismuth sequentially enters a loop inflow pipeline (16), a loop pipeline sudden expansion elbow (15) and a vertical pipeline dissolving cavity (17), and then enters a downstream system through a loop outflow pipeline (13);
the motor (1) drives the screw (5) to move the charging barrel (6) into the charging barrel isolation cavity (8), the electric valve (12) is closed, and the charging barrel (6) is isolated from liquid lead bismuth;
when the oxygen ion concentration in the liquid lead bismuth flow pipeline is smaller than the first preset concentration:
starting a heating wire (14) to heat liquid lead bismuth in a vertical pipeline dissolving cavity (17);
the opening of an electric valve (12) is regulated, a motor (1) drives a screw (5) to insert a charging barrel (6) into a vertical pipeline dissolving cavity (17) of a liquid lead bismuth flow pipeline;
the heated liquid lead bismuth flows through a vertical pipeline dissolving cavity (17) to dissolve lead oxide ceramic pellets in a charging barrel (6), and lead oxide enters a downstream liquid lead bismuth system to realize solid oxygen-controlled oxygen ion exchange of the liquid lead bismuth;
when the oxygen ion concentration in the liquid lead bismuth flow pipeline is larger than the second preset concentration:
the motor (1) drives the screw (5) to enable the charging barrel (6) to move upwards to the charging barrel isolation cavity (8), the electric valve (12) is closed, and the charging barrel (6) is isolated from liquid lead bismuth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311042866.4A CN117079844A (en) | 2023-08-18 | 2023-08-18 | Electric solid oxygen control and regulation system for lead-based fast reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311042866.4A CN117079844A (en) | 2023-08-18 | 2023-08-18 | Electric solid oxygen control and regulation system for lead-based fast reactor |
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