CN109949955A - A kind of spentnuclear fuel short section oxidation unit and its method - Google Patents
A kind of spentnuclear fuel short section oxidation unit and its method Download PDFInfo
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- CN109949955A CN109949955A CN201910221206.XA CN201910221206A CN109949955A CN 109949955 A CN109949955 A CN 109949955A CN 201910221206 A CN201910221206 A CN 201910221206A CN 109949955 A CN109949955 A CN 109949955A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention belongs to spentnuclear fuel post-processing technology fields, and in particular to a kind of spentnuclear fuel short section oxidation unit and its method.The device includes the furnace body that seals and can heat；The protective cover of sealing in the inner cavity of furnace body is set; cylindric oxidation reactor in protective cover is set by transmission shaft; transmission shaft is arranged along the cental axial position of oxidation reactor; and energy band dynamic oxidation reactor rotates together, transmission shaft is located at the part in oxidation reactor equipped with helical blade；The barrel of oxidation reactor is uniformly arranged several through-holes；It further include that tail end is connected to the top of oxidation reactor, top string is located at the feed pipe of furnace body upper outer；It further include that top is connected to protective cover, tail end string is located at reaction gas air inlet pipe outside furnace body；It further include the powder receiver below oxidation reactor, the dust outlet of powder receiver extends to furnace body lower outer；It further include that top is connected to the tail end of oxidation reactor, tail end is threaded through the involucrum delivery pipe of furnace body lower outer.
Description
Technical field
The invention belongs to spentnuclear fuel post-processing technology fields, and in particular to a kind of spentnuclear fuel short section oxidation unit and its side
Method.
Background technique
Spentnuclear fuel post-processing is to realize that spent nuclear fuel in nuclear power plant post-processes a kind of important way properly managed.Currently, reaction
The tritium that heap fission generates, it is most of to be discharged during spent fuel reprocessing process, for traditional reprocessing plant, entirely
Process heavy metal per ton will generate about 100m3Tritium-containing liquid waste.But since oxide morphology tritium (HTO, DTO and T2O) can be directly
The circulation of body fluid is participated in, radiotoxicity is 10000 times stronger than elemental gas tritium (HT, DT and T2).Therefore, from safety and environmental protection
From the point of view of, realize that the centralized management of tritium becomes very necessary.The general process of spentnuclear fuel is first to be cut into short section at present,
Then uranium dioxide pellet is dissolved with nitric acid, the extraction of the elements such as uranium plutonium is finally realized using extraction process.The dissolution of nitric acid
Tritium contained in spentnuclear fuel can be transferred in aqueous solution by journey, since tritium and hydrogen are isotopes, so that the centralized management of tritium becomes
It is unrealistic.Before traditional spentnuclear fuel post-processes head end dissolution process, by by the uranium dioxide pellet in spentnuclear fuel short section
It is oxidized to triuranium octoxide powder, most tritiums in spent fuel element is concentrated with gas procedure exclude in advance, and passed through
Absorption processing is concentrated in purification device, and tritium is avoided to enter in the process flow of nuclear fuel post-processing, for post-processing the concentrate tube of tritium
Reason and processing have great importance.In addition, the uranium dioxide pellet in spentnuclear fuel short section is oxidized to triuranium octoxide powder,
It also can the biggish subsequent course of dissolution of convenience.
The oxidation unit of spentnuclear fuel short section is one of the key technology for realizing this process.The device requires can be quick and complete
Uranium dioxide pellet is aoxidized, tritium discharges to the greatest extent in spentnuclear fuel pellet to realize, while needing to realize gained eight after oxidation
Aoxidize the separation of triuranium powder and involucrum.Currently, the spentnuclear fuel oxidation unit having been reported that is commonly batch operation, it is multiple that there are structures
It is miscellaneous, processing speed is slow, processing capacity is low, cannot achieve oxidation after gained triuranium octoxide powder and involucrum between efficiently separating
The deficiencies of.
Summary of the invention
A kind of device of quickly oxidation spentnuclear fuel short section is provided it is an object of the invention to overcome the shortcomings of existing technologies
And method.
To achieve the above objectives, the technical solution adopted by the present invention is that a kind of spentnuclear fuel short section oxidation unit, is used for weary
Fuel short section carries out oxidation processes, wherein including the furnace body that seals and can heat；It is arranged in the inner cavity of the furnace body
The cylindric oxidation reactor in the protective cover is arranged in by transmission shaft in the protective cover of sealing, and the transmission shaft is along institute
The cental axial position setting of oxidation reactor is stated, and the oxidation reactor can be driven to rotate together, the transmission shaft is located at institute
It states the part in oxidation reactor and is equipped with the helical blade being all connected with the oxidation reactor and the transmission shaft；The oxidation
The barrel of reactor is uniformly arranged several through-holes；It further include that tail end is connected to the top of the oxidation reactor, top string is located at
The feed pipe of the furnace body upper outer；It further include that top is connected to the protective cover, tail end string is located at outside the furnace body
Reaction gas air inlet pipe；It further include the powder receiver below the oxidation reactor, the powder of the powder receiver goes out
Mouth extends to the furnace body lower outer；Further include top be connected to the tail end of the oxidation reactor, tail end be threaded through it is described
The involucrum delivery pipe of furnace body lower outer.
Further, the both ends of the transmission shaft extend to except the furnace body, and wherein one end passes through retarder and frequency modulation electricity
Machine is connected, and the inside of the barrel of the oxidation reactor is equipped with several plectrums, and the furnace body inside is equipped with insulating layer；It further include tail
End is connected to the inner cavity, and top is threaded through the first tail gas discharging pipe of the furnace body upper outer；Further include tail end with it is described
Protective cover connection, top is threaded through the second tail gas discharging pipe of the furnace body upper outer.
It further, further include the temperature tube being threaded through on the furnace body, for measuring the interior environment temperature of the inner cavity；
The both ends of the transmission shaft are equipped with cooling protection set, for guaranteeing the sealing between the transmission shaft and the furnace body.
Further, the spentnuclear fuel short section when the oxidation reactor rotates in the forward direction, inside the oxidation reactor
It is conveyed along the top of the oxidation reactor to the tail end direction of the oxidation reactor by the helical blade；When the oxygen
When changing reactor reverse rotation, the spentnuclear fuel short section inside the oxidation reactor is by the helical blade along the oxygen
The tail end for changing reactor is conveyed to the top orientation of the oxidation reactor.
Further, the aperture of the through-hole is 0.2mm.
Further, the aperture of the through-hole is 1mm.
Further, the aperture of the through-hole is 3mm.
To achieve the above objectives, the invention also discloses a kind of spentnuclear fuel short section method for oxidation, the hole for the through-hole
Diameter is the spentnuclear fuel short section oxidation unit of 0.2mm, comprising the following steps:
The inner cavity temperature of the furnace body is heated and maintains 400 DEG C by step S1, from the reaction gas air inlet pipe to
It is continually fed into air in the protective cover, lasting negative pressure is arranged in the top end opening in the outside of second tail gas discharging pipe,
Prevent radioactive substance out of described furnace body to outward leakage；The negative pressure is -5~-50Pa；
Spentnuclear fuel short section described in 0.5kg is added into the oxidation reactor from the feed pipe by step S2；
Step S3 makes the spentnuclear fuel short section be located at the oxidation reaction by rotating in the forward direction the oxidation reactor
In the middle part of device；
Step S4, and it is positive, be reversely alternately rotated the oxidation reactor, promote oxidation and the oxygen of the spentnuclear fuel short section
The separation of powder and involucrum after change；
Step S5, when being fallen into the powder receiver there is no the powder, or it is positive, be reversely alternately rotated institute
After stating 5 hours oxidation reactor duration, the oxidation reactor is continuously rotated in the forward direction, by the involucrum separated from institute
State the discharge of involucrum delivery pipe.
To achieve the above objectives, the invention also discloses a kind of spentnuclear fuel short section method for oxidation, the hole for the through-hole
Diameter is the spentnuclear fuel short section oxidation unit of 1mm, comprising the following steps:
The inner cavity temperature of the furnace body is heated and maintains 500 DEG C by step S1, from the reaction gas air inlet pipe to
The nitrogen oxygen atmosphere of 50% concentration is continually fed into the protective cover with the rate of 150L/h, in second tail gas discharging pipe
Lasting negative pressure is arranged in external top end opening, prevents radioactive substance out of described furnace body to outward leakage；The negative pressure be-
5Pa；
Spentnuclear fuel short section described in 0.5kg is added into the oxidation reactor from the feed pipe by step S2；
Step S3 makes the spentnuclear fuel short section be located at the oxidation reaction by rotating in the forward direction the oxidation reactor
In the middle part of device；
Step S4, and it is positive, be reversely alternately rotated the oxidation reactor, the duration 2 hours, promote the spentnuclear fuel
The oxidation of short section and powder after oxidation are separated with involucrum；
Step S5 continuously rotates in the forward direction the oxidation reactor, by the involucrum separated from the involucrum delivery pipe
Discharge；
Step S6 executes the step S2 to the step S5 repeatedly
To achieve the above objectives, the invention also discloses a kind of spentnuclear fuel short section method for oxidation, the hole for the through-hole
Diameter is the spentnuclear fuel short section oxidation unit of 3mm, comprising the following steps:
The inner cavity temperature of the furnace body is heated and maintains 600 DEG C by step S1, from the reaction gas air inlet pipe to
Oxygen is continually fed into the rate of 100L/h in the protective cover, the top end opening in the outside of second tail gas discharging pipe is set
Lasting negative pressure is set, prevents radioactive substance out of described furnace body to outward leakage；The negative pressure is -50Pa；
Spentnuclear fuel short section described in 0.5kg is added into the oxidation reactor from the feed pipe by step S2；
Step S3 makes the spentnuclear fuel short section be located at the oxidation reaction by rotating in the forward direction the oxidation reactor
In the middle part of device；
Step S4, and it is positive, be reversely alternately rotated the oxidation reactor, the duration 0.5 hour, promote the weary combustion
Expect the oxidation of short section and separating for powder after oxidation and involucrum；
Step S5 continuously rotates in the forward direction the oxidation reactor, by the involucrum separated from the involucrum delivery pipe
Discharge；
Step S6 executes the step S2 to the step S5 repeatedly.
The beneficial effects of the present invention are:
1. the present invention can only effectively promote the oxidation of uranium dioxide pellet, control by the rotation of oxidation reactor 14
Residence time of the uranium dioxide pellet in oxidation reactor 14, and realize the separation of triuranium octoxide powder and involucrum, tool
Have that reaction speed is fast, simple operation and other advantages.
2. the design that oxidation reactor 14 and transmission shaft 11 rotate together avoids helical blade 13 and the feelings to get stuck occurs
Condition ensure that the stability of device during operation.
3. arranging plectrum inside oxidation reactor 14, agitation is further strengthened, promotes the oxidation of spentnuclear fuel short section.
4. being guaranteed not by the way that the spentnuclear fuel short section of different feeds time is in the axial different location of oxidation reactor 14
Spentnuclear fuel short section with feed time does not mix, and realizes being carried out continuously for oxidation process.
5. connecing a degree of negative pressure by the first tail gas discharging pipe 8 and the second tail gas discharging pipe 9, make whole device weak
It is run under negative pressure, radioactive substance is avoided to leak to outside device.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of spentnuclear fuel short section oxidation unit described in the specific embodiment of the invention；
In figure: 1- frequency modulation motor, 2- retarder, 3- cooling protection set, 4- furnace body, 5- protective cover, 6- feed pipe, 7- thermometric
Pipe, the first tail gas discharging pipe of 8-, the second tail gas discharging pipe of 9-, 10- electric heater unit, 11- transmission shaft, 12- reaction gas air inlet pipe,
13- helical blade, 14- oxidation reactor, 15- powder receiver, 16- dust outlet, 17- involucrum delivery pipe, the inner cavity 18-.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of spentnuclear fuel short section oxidation unit provided by the invention, for being aoxidized to spentnuclear fuel short section
Processing, wherein including the furnace body 4 that seals and can heat；The protective cover 5 of sealing in the inner cavity 18 of furnace body 4 is set, is led to
The cylindric oxidation reactor 14 that transmission shaft 11 is arranged in protective cover 5 is crossed, transmission shaft 11 is along the center of oxidation reactor 14
Shaft position setting, and energy band dynamic oxidation reactor 14 rotates together, the part that transmission shaft 11 is located in oxidation reactor 14 is equipped with
Helical blade 13, helical blade 13 are all connected with oxidation reactor 14 and transmission shaft 11；The barrel of oxidation reactor 14 is uniformly set
Set several through-holes；It further include that tail end is connected to the top of oxidation reactor 14, top string is located at the feed pipe of 4 upper outer of furnace body
6；It further include that top is connected to protective cover 5, tail end string is located at reaction gas air inlet pipe 12 outside furnace body 4；It further include being located at oxidation
The powder receiver 15 of 14 lower section of reactor, the dust outlet 16 of powder receiver 15 extend to 4 lower outer of furnace body；Further include
Top is connected to the tail end of oxidation reactor 14, tail end is threaded through the involucrum delivery pipe 17 of 4 lower outer of furnace body.
The both ends of transmission shaft 11 extend to except furnace body 4, and wherein one end is connected by retarder 2 with frequency modulation motor 1, aoxidize
The inside of the barrel of reactor 14 is equipped with several plectrums, is equipped with insulating layer on the inside of furnace body 4；It further include that tail end is connected to inner cavity 18,
Top is threaded through the first tail gas discharging pipe 8 of 4 upper outer of furnace body；It further include that tail end is connected to protective cover 5, top is threaded through furnace
Second tail gas discharging pipe 9 of 4 upper outer of body.
It further include the temperature tube 7 being threaded through on furnace body 4, for measuring the interior environment temperature of inner cavity 18；Transmission shaft 11
Both ends are equipped with cooling protection set 3, for guaranteeing the sealing between transmission shaft 11 and furnace body 4, coolant include empty gas and water or its
His coolant；Water-cooling protective sleeve 3 can prevent transmission shaft 11 because of seal failure caused by axial expansion after heated.
When oxidation reactor 14 rotates in the forward direction, spentnuclear fuel short section inside oxidation reactor 14 by helical blade 13 along
The top of oxidation reactor 14 is conveyed to the tail end direction of oxidation reactor 14；When oxidation reactor 14 reversely rotates, oxidation
Spentnuclear fuel short section inside reactor 14 is by helical blade 13 along the tail end of oxidation reactor 14 to the top of oxidation reactor 14
Extreme direction conveying.
The aperture of through-hole on oxidation reactor 14 be it is unified, according to actual needs, the specification in aperture include 0.2mm,
1mm, 3mm etc. are several.
The invention discloses use through-hole aperture to be a kind of spentnuclear fuel short section oxygen of the spentnuclear fuel short section oxidation unit of 0.2mm
Change method, includes the following steps:
18 temperature of inner cavity of furnace body 4 is heated and maintains 400 DEG C, from reaction gas air inlet pipe 12 to protective cover 5 by step S1
It is inside continually fed into air, lasting negative pressure is arranged in the top end opening in the outside of the second tail gas discharging pipe 9, prevents radioactive substance
To outward leakage out of furnace body 4；Negative pressure is -5~-50Pa；
0.5kg spentnuclear fuel short section is added into oxidation reactor 14 from feed pipe 6 by step S2；
Step S3 makes spentnuclear fuel short section be located at 14 middle part of oxidation reactor by rotating in the forward direction oxidation reactor 14；
Step S4, and it is positive, be reversely alternately rotated oxidation reactor 14, after the oxidation and oxidation that promote spentnuclear fuel short section
The separation of powder and involucrum；The triuranium octoxide powder generated in oxidation process is the logical of 0.2mm by reactor outer barrel diameter
Hole is fallen in the powder receiver 15 of lower section；
Step S5, when being fallen into powder receiver 15 there is no powder, or it is positive, be reversely alternately rotated oxidation reaction
After 14 5 hours duration of device, continuously rotate in the forward direction oxidation reactor 14, by by isolated involucrum from 17 row of involucrum delivery pipe
Out.
The invention discloses use a kind of spentnuclear fuel short section oxidation that through-hole aperture is the spentnuclear fuel short section oxidation unit of 1mm
Method includes the following steps:
18 temperature of inner cavity of furnace body 4 is heated and maintains 500 DEG C, from reaction gas air inlet pipe 12 to protective cover 5 by step S1
The interior rate with 150L/h is continually fed into the nitrogen oxygen atmosphere of 50% concentration, opens on the top of the outside of the second tail gas discharging pipe 9
Lasting negative pressure is arranged in mouth, prevents radioactive substance out of furnace body 4 to outward leakage；Negative pressure is -5Pa；
0.5kg spentnuclear fuel short section is added into oxidation reactor 14 from feed pipe 6 by step S2；
Step S3 makes spentnuclear fuel short section be located at 14 middle part of oxidation reactor by rotating in the forward direction oxidation reactor 14；
Step S4, and it is positive, be reversely alternately rotated oxidation reactor 14, the duration 2 hours, promote spentnuclear fuel short section
Powder and involucrum after oxidation and oxidation separate；The triuranium octoxide powder generated in oxidation process is straight by reactor outer cylinder
Diameter is that the through-hole of 1mm is fallen in the powder receiver 15 of lower section；
Step S5 continuously rotates in the forward direction oxidation reactor 14, will be discharged by isolated involucrum from involucrum delivery pipe 17；
Step S6 executes step S2 to step S5 repeatedly.The weary combustion of next group 0.5kg can namely be added in the process of running
Expect short section, it is continuous to rotate forward oxidation reactor 14 after addition, so that the spentnuclear fuel short section being newly added is located at the suitable of oxidation reactor 14
The spentnuclear fuel short section of position, the last batch being axially distributed in simultaneous oxidation reactor 14 can all move a spacing along axis forward direction
From.In this way, constantly operation, residual after the oxidation of last consignment of spentnuclear fuel short section in the continuous rotating forward after certain batch of spentnuclear fuel short section is added
The involucrum discharge oxidation reactor 14 stayed.Continuous charging and discharging, realize the continuous operation of oxidation unit.
The invention discloses use a kind of spentnuclear fuel short section oxidation that through-hole aperture is the spentnuclear fuel short section oxidation unit of 3mm
Method includes the following steps:
18 temperature of inner cavity of furnace body 4 is heated and maintains 600 DEG C, from reaction gas air inlet pipe 12 to protective cover 5 by step S1
Interior to be continually fed into oxygen with the rate of 100L/h, lasting negative pressure is arranged in the top end opening in the outside of the second tail gas discharging pipe 9,
Prevent radioactive substance out of furnace body 4 to outward leakage；Negative pressure is -50Pa；
0.5kg spentnuclear fuel short section is added into oxidation reactor 14 from feed pipe 6 by step S2；
Step S3 makes spentnuclear fuel short section be located at 14 middle part of oxidation reactor by rotating in the forward direction oxidation reactor 14；
Step S4, and it is positive, be reversely alternately rotated oxidation reactor 14, the duration 0.5 hour, promote spentnuclear fuel short section
Oxidation and oxidation after powder and involucrum separate；The triuranium octoxide powder generated in oxidation process passes through reactor outer cylinder
Diameter is that the through-hole of 3mm is fallen in the powder receiver 15 of lower section；
Step S5 continuously rotates in the forward direction oxidation reactor 14, will be discharged by isolated involucrum from involucrum delivery pipe 17；
Step S6 executes step S2 to step S5 repeatedly.The weary combustion of next group 0.5kg can namely be added in the process of running
Expect short section, it is continuous to rotate forward oxidation reactor 14 after addition, so that the spentnuclear fuel short section being newly added is located at the suitable of oxidation reactor 14
The spentnuclear fuel short section of position, the last batch being axially distributed in simultaneous oxidation reactor 14 can all move a spacing along axis forward direction
From.In this way, constantly operation, residual after the oxidation of last consignment of spentnuclear fuel short section in the continuous rotating forward after certain batch of spentnuclear fuel short section is added
The involucrum discharge oxidation reactor 14 stayed.Continuous charging and discharging, realize the continuous operation of oxidation unit.
Device of the present invention is not limited to embodiment described in specific embodiment, those skilled in the art according to
Technical solution of the present invention obtains other embodiments, also belongs to the scope of the technical innovation of the present invention.
Claims (10)
1. a kind of spentnuclear fuel short section oxidation unit, for carrying out oxidation processes to spentnuclear fuel short section, it is characterized in that: including sealing simultaneously
And the furnace body (4) that can be heated；The protective cover (5) of sealing in the inner cavity (18) of the furnace body (4) is set, transmission shaft is passed through
(11) the cylindric oxidation reactor (14) being arranged in the protective cover (5), the transmission shaft (11) are anti-along the oxidation
It answers the cental axial position of device (14) to be arranged, and the oxidation reactor (14) can be driven to rotate together, transmission shaft (11) position
It is equipped in the part in the oxidation reactor (14) and is all connected with the oxidation reactor (14) and the transmission shaft (11)
Helical blade (13)；The barrel of the oxidation reactor (14) is uniformly arranged several through-holes；It further include that tail end and the oxidation are anti-
The top of device (14) is answered to be connected to, top string is located at the feed pipe (6) of the furnace body (4) upper outer；Further include top with it is described
Protective cover (5) connection, tail end string are located at the external reaction gas air inlet pipe (12) of the furnace body (4)；It further include being located at the oxidation
The dust outlet (16) of powder receiver (15) below reactor (14), the powder receiver (15) extends to the furnace body
(4) lower outer；It further include that top is connected to the tail end of the oxidation reactor (14), tail end is threaded through under the furnace body (4)
Involucrum delivery pipe (17) outside side.
2. spentnuclear fuel short section oxidation unit as described in claim 1 is it is characterized in that: the both ends of the transmission shaft (11) extend to
Except the furnace body (4), wherein one end is connected by retarder (2) with frequency modulation motor (1), the cylinder of the oxidation reactor (14)
The inside of wall is equipped with several plectrums, is equipped with insulating layer on the inside of the furnace body (4)；It further include that tail end is connected to the inner cavity (18),
Top is threaded through first tail gas discharging pipe (8) of the furnace body (4) upper outer；It further include that tail end and the protective cover (5) connect
Logical, top is threaded through second tail gas discharging pipe (9) of the furnace body (4) upper outer.
3. spentnuclear fuel short section oxidation unit as claimed in claim 2, it is characterized in that: further including being threaded through on the furnace body (4)
Temperature tube (7), for measuring the interior environment temperature of the inner cavity (18)；The both ends of the transmission shaft (11) are equipped with cooling protect
Sheath (3), for guaranteeing the sealing between the transmission shaft (11) and the furnace body (4).
4. spentnuclear fuel short section oxidation unit as claimed in claim 3, it is characterized in that: when the oxidation reactor (14) positive rotation
When turning, the internal spentnuclear fuel short section of the oxidation reactor (14) is by the helical blade (13) along the oxidation reaction
The top of device (14) is conveyed to the tail end direction of the oxidation reactor (14)；When the oxidation reactor (14) reversely rotate
When, the internal spentnuclear fuel short section of the oxidation reactor (14) is by the helical blade (13) along the oxidation reactor
(14) tail end is conveyed to the top orientation of the oxidation reactor (14).
5. spentnuclear fuel short section oxidation unit as claimed in claim 4, it is characterized in that: the aperture of the through-hole is 0.2mm.
6. spentnuclear fuel short section oxidation unit as claimed in claim 4, it is characterized in that: the aperture of the through-hole is 1mm.
7. spentnuclear fuel short section oxidation unit as claimed in claim 4, it is characterized in that: the aperture of the through-hole is 3mm.
8. being used for a kind of spentnuclear fuel short section method for oxidation of spentnuclear fuel short section oxidation unit as claimed in claim 5, including such as
Lower step:
The inner cavity (18) temperature of the furnace body (4) is heated and maintains 400 DEG C, from the reaction gas air inlet by step S1
It is continually fed into air in pipe (12) Xiang Suoshu protective cover (5), the top end opening in the outside of second tail gas discharging pipe (9) is set
Lasting negative pressure is set, prevents radioactive substance out of the furnace body (4) to outward leakage；The negative pressure is -5~-50Pa；
Spentnuclear fuel short section described in 0.5kg is added from the feed pipe (6) Xiang Suoshu oxidation reactor (14) is interior in step S2；
Step S3 makes the spentnuclear fuel short section be located at the oxidation reaction by rotating in the forward direction the oxidation reactor (14)
In the middle part of device (14)；
Step S4, and it is positive, be reversely alternately rotated the oxidation reactor (14), promote oxidation and the oxygen of the spentnuclear fuel short section
The separation of powder and involucrum after change；
Step S5, when being fallen into there is no the powder in the powder receiver (15), or it is positive, be reversely alternately rotated institute
After stating 5 hours (14) duration of oxidation reactor, the oxidation reactor (14) are continuously rotated in the forward direction, it will be described in separating
Involucrum is discharged from the involucrum delivery pipe (17).
9. being used for a kind of spentnuclear fuel short section method for oxidation of spentnuclear fuel short section oxidation unit as claimed in claim 6, including such as
Lower step:
The inner cavity (18) temperature of the furnace body (4) is heated and maintains 500 DEG C, from the reaction gas air inlet by step S1
The nitrogen oxygen atmosphere of 50% concentration is continually fed into pipe (12) Xiang Suoshu protective cover (5) with the rate of 150L/h, described second
Lasting negative pressure is arranged in the top end opening of the outside of tail gas discharging pipe (9), prevent radioactive substance from the furnace body (4) from inside to outside
Leakage；The negative pressure is -5Pa；
Spentnuclear fuel short section described in 0.5kg is added from the feed pipe (6) Xiang Suoshu oxidation reactor (14) is interior in step S2；
Step S3 makes the spentnuclear fuel short section be located at the oxidation reaction by rotating in the forward direction the oxidation reactor (14)
In the middle part of device (14)；
Step S4, and it is positive, be reversely alternately rotated the oxidation reactor (14), the duration 2 hours, promote the spentnuclear fuel
The oxidation of short section and powder after oxidation are separated with involucrum；
Step S5 continuously rotates in the forward direction the oxidation reactor (14), by the involucrum separated from the involucrum delivery pipe
(17) it is discharged；
Step S6 executes the step S2 to the step S5 repeatedly.
10. being used for a kind of spentnuclear fuel short section method for oxidation of spentnuclear fuel short section oxidation unit as claimed in claim 7, including such as
Lower step:
The inner cavity (18) temperature of the furnace body (4) is heated and maintains 600 DEG C, from the reaction gas air inlet by step S1
Oxygen is continually fed into the rate of 100L/h in pipe (12) Xiang Suoshu protective cover (5), in the outer of second tail gas discharging pipe (9)
Lasting negative pressure is arranged in the top end opening in portion, prevents radioactive substance out of the furnace body (4) to outward leakage；The negative pressure be-
50Pa；
Spentnuclear fuel short section described in 0.5kg is added from the feed pipe (6) Xiang Suoshu oxidation reactor (14) is interior in step S2；
Step S3 makes the spentnuclear fuel short section be located at the oxidation reaction by rotating in the forward direction the oxidation reactor (14)
In the middle part of device (14)；
Step S4, and it is positive, be reversely alternately rotated the oxidation reactor (14), the duration 0.5 hour, promote the weary combustion
Expect the oxidation of short section and separating for powder after oxidation and involucrum；
Step S5 continuously rotates in the forward direction the oxidation reactor (14), by the involucrum separated from the involucrum delivery pipe
(17) it is discharged；
Step S6 executes the step S2 to the step S5 repeatedly.
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| CN201910221206.XA CN109949955B (en) | 2019-03-22 | 2019-03-22 | Spent fuel short-section oxidation device and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670005A (en) * | 2020-12-18 | 2021-04-16 | 中广核研究院有限公司 | Spent fuel rod treatment method |
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| CN109949955B (en) | 2021-01-05 |
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