CN113267001A - Drying device and drying method for radioactive zirconium cladding pipe section - Google Patents
Drying device and drying method for radioactive zirconium cladding pipe section Download PDFInfo
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- CN113267001A CN113267001A CN202110529325.9A CN202110529325A CN113267001A CN 113267001 A CN113267001 A CN 113267001A CN 202110529325 A CN202110529325 A CN 202110529325A CN 113267001 A CN113267001 A CN 113267001A
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- 238000001035 drying Methods 0.000 title claims abstract description 106
- 238000005253 cladding Methods 0.000 title claims abstract description 79
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052726 zirconium Inorganic materials 0.000 title claims abstract description 61
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 60
- 230000007246 mechanism Effects 0.000 claims abstract description 114
- 238000007789 sealing Methods 0.000 claims abstract description 49
- 239000012159 carrier gas Substances 0.000 claims abstract description 46
- 238000001914 filtration Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 22
- 238000002955 isolation Methods 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000007774 longterm Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002901 radioactive waste Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002915 spent fuel radioactive waste Substances 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
Abstract
The invention discloses a drying device and a drying method for a radioactive zirconium cladding pipe section, which comprise the following steps: drying mechanism includes: set up desicator base and the desicator exhaust hood in hot room, dry mechanism still includes: a shell barrel; the sealing mechanism is used for connecting the dryer base with the dryer exhaust hood or the cladding barrel; the carrier gas input mechanism is positioned outside the hot chamber and is connected with the dryer base through a first connecting pipeline, and the first connecting pipeline penetrates through the hot chamber; the filtering mechanism is positioned in the hot chamber and is connected with the dryer base through a third connecting pipeline; and the suction mechanism is positioned outside the hot chamber, is connected with the filtering mechanism through a fourth connecting pipeline, and penetrates through the hot chamber. The drying device and the drying method for the radioactive zirconium cladding pipe section can realize remote operation, reduce the water content of the radioactive zirconium cladding pipe section to a drying target value, meet the long-term safe storage requirement of the radioactive zirconium cladding pipe section, and fill up the technical blank.
Description
Technical Field
The invention belongs to the technical field of radioactive waste treatment, and particularly relates to a drying device and a drying method for a radioactive zirconium cladding pipe section.
Background
In a power reactor spent fuel post-treatment plant, after spent fuel is sheared, dissolved and rinsed, a certain amount of rinsing liquid is carried in a generated radioactive zirconium cladding pipe section, the safety requirement of long-term storage or disposal of radioactive waste cannot be met, drying treatment is needed, and the water content is reduced to be below a target value. Meanwhile, the radioactive zirconium cladding tube section has high neutron activation products and a certain amount of fission nuclides, and needs to be operated remotely in a sealed shielding box chamber. The radioactive zirconium cladding pipe section is made of zirconium alloy, and the spontaneous combustion risk exists. At present, no drying technology for radioactive zirconium cladding pipe sections exists in China.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a drying device and a drying method for a radioactive zirconium cladding pipe section aiming at the defects in the prior art, and the requirement of long-term safe storage of the radioactive zirconium cladding pipe section is met.
The technical scheme adopted for solving the technical problem of the invention is to provide a drying device for a radioactive zirconium cladding pipe section, which comprises the following components:
drying mechanism includes: set up the desicator base that is used for holding the involucrum bucket in the hot chamber and be used for covering the desicator exhaust hood that closes desicator base open-ended, drying mechanism still includes: the cladding barrel is used for containing the radioactive zirconium cladding pipe section and is used for containing the radioactive zirconium cladding pipe section;
the sealing mechanism is used for connecting the dryer base with the dryer exhaust hood or the cladding barrel and sealing the dryer base so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the carrier gas input mechanism is positioned outside the hot chamber and is connected with the dryer base through a first connecting pipeline, the first connecting pipeline penetrates through the hot chamber, the carrier gas input mechanism is used for inputting carrier gas into the drying mechanism for drying, and the carrier gas is nitrogen and/or inert gas;
the filtering mechanism is positioned in the hot chamber, is connected with the dryer base through a third connecting pipeline and is used for filtering the materials discharged by the drying mechanism;
the suction mechanism is located outside the hot chamber and is connected with the filtering mechanism through a fourth connecting pipeline, the fourth connecting pipeline penetrates through the hot chamber, and the suction mechanism is used for pumping air to form micro negative pressure.
Preferably, the sealing mechanism includes:
the first inflatable sealing air bag is arranged on the dryer base and used for sealing a gap between the opening of the dryer base and the exhaust hood of the dryer so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the inflation mechanism is positioned outside the hot chamber and is connected with the first sealed air bag through a second connecting pipeline, the second connecting pipeline penetrates through the hot chamber, and the inflation mechanism is used for inflating the first sealed air bag;
and the exhaust mechanism is positioned outside the hot chamber, is connected with the first sealing air bag through a second connecting pipeline and is used for exhausting the first sealing air bag.
Preferably, the flow guide hole has been seted up on the encloser bucket, and sealing mechanism still includes: the second sealed airbag, the second sealed airbag sets up on the desicator base, the inflating mechanism is connected with the second sealed airbag through the second connecting tube, the exhaust mechanism is connected with the second sealed airbag through the second connecting tube, the inflated second sealed airbag is used for separating the space between desicator base and the cladding bucket into two parts, wherein, the junction of first connecting tube and desicator base, the junction of third connecting tube and desicator base is located the sealed airbag both sides of second respectively, and the water conservancy diversion hole, the junction of first connecting tube and desicator base is located the homonymy of the sealed airbag of second.
Preferably, the inflation mechanism includes: the inflation gas source and the third valve are sequentially connected, and the third valve is connected with the first sealing air bag;
the exhaust mechanism includes: exhaust duct, set up the fourth valve on exhaust duct, exhaust duct and second connecting tube are connected.
Preferably, the dryer exhaust hood is snap-fit into the dryer base opening.
Preferably, the filter mechanism includes: the middle-effect filter and the high-efficiency filter are connected in sequence, the middle-effect filter is connected with the dryer base, and the high-efficiency filter is connected with the suction mechanism.
Preferably, the carrier gas input mechanism includes: the dryer comprises a carrier gas source, a first valve, a heater and a second valve which are connected in sequence, wherein the second valve is connected with a dryer base;
the suction mechanism includes: the fifth valve and the aspirator are connected in sequence, and the fifth valve is connected with the filtering mechanism.
The suction device is a draught fan, a compressor or other gas conveying devices.
The invention also provides a drying method of the drying device using the radioactive zirconium cladding pipe section, which comprises the following steps:
placing the cladding barrel containing the radioactive zirconium cladding pipe section into a dryer base;
covering the exhaust hood of the dryer, sealing by a sealing mechanism, realizing the isolation of the drying mechanism from the ambient atmosphere and limiting the carrier gas flow path;
inputting carrier gas into the dryer base through a carrier gas input mechanism, drying the cladding barrel and the radioactive zirconium cladding pipe section, and pumping air through a pumping mechanism;
and after the drying target value is reached, stopping inputting carrier gas into the dryer base, and cooling to the set temperature.
Preferably, the drying target is < 25.86g water/kg gas, cooled to < 100 ℃.
Preferably, the drying device is used, and the heating temperature of the heater is 100 to 300 ℃.
Preferably, the drying device is used, and the filtering efficiency of the medium-efficiency filter is improved
More than or equal to 85 percent, and the filtering efficiency of the high-efficiency filter is more than or equal to 99.99 percent.
Preferably, the temperature of the carrier gas introduced into the dryer base is 100 to 300 ℃, the pressure is 0 to 0.1MPa, and the flow rate is 10 to 75 kg/h.
The drying device and the drying method for the radioactive zirconium cladding pipe section can realize remote operation, reduce the water content of the radioactive zirconium cladding pipe section to a drying target value, meet the long-term safe storage requirement of the radioactive zirconium cladding pipe section, and fill up the technical blank.
Drawings
FIG. 1 is a schematic view showing the structure of a drying apparatus for a radioactive zirconium cladding pipe segment in example 2 of the present invention.
In the figure: 1-a third valve; 2-a first valve; 3-a heater; 4-a second valve; 5-a dryer; 6-dryer base; 7-dryer exhaust hood; 8-a shell-wrapping barrel; 9-a first sealed bladder; 10-a medium effect filter; 11-a high efficiency filter; 12-a fifth valve; 13-an aspirator; 14-a fourth valve; 15-diversion holes; 16-a second sealed bladder; 17-a hot chamber; 18-a first connecting conduit; 19-a second connecting duct; 20-a third connecting conduit; 21-a fourth connecting conduit; 22-a carrier gas source; 23-a source of inflation gas; 24-exhaust duct.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
Example 1
The embodiment provides a drying device for a radioactive zirconium cladding pipe section, which comprises:
drying mechanism includes: set up the desicator base that is used for holding the involucrum bucket in the hot chamber and be used for covering the desicator exhaust hood that closes desicator base open-ended, drying mechanism still includes: the cladding barrel is used for containing the radioactive zirconium cladding pipe section and is used for containing the radioactive zirconium cladding pipe section;
the sealing mechanism is used for connecting the dryer base with the dryer exhaust hood or the cladding barrel and sealing the dryer base so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the carrier gas input mechanism is positioned outside the hot chamber and is connected with the dryer base through a first connecting pipeline, the first connecting pipeline penetrates through the hot chamber, the carrier gas input mechanism is used for inputting carrier gas into the drying mechanism for drying, and the carrier gas is nitrogen and/or inert gas;
the filtering mechanism is positioned in the hot chamber, is connected with the dryer base through a third connecting pipeline and is used for filtering the materials discharged by the drying mechanism;
the suction mechanism is located outside the hot chamber and is connected with the filtering mechanism through a fourth connecting pipeline, the fourth connecting pipeline penetrates through the hot chamber, and the suction mechanism is used for pumping air to form micro negative pressure.
The embodiment also provides a drying method of the drying device using the radioactive zirconium cladding pipe section, which comprises the following steps:
placing the cladding barrel containing the radioactive zirconium cladding pipe section into a dryer base;
covering an exhaust hood of the dryer, and sealing by a sealing mechanism to realize the isolation of the drying mechanism from the ambient atmosphere;
heating carrier gas is input into the dryer base through a carrier gas input mechanism, the cladding barrel and the radioactive zirconium cladding pipe section are dried, and air is extracted through a suction mechanism;
and after the drying target value is reached, normal-temperature carrier gas is input into the dryer base, and the temperature is reduced to the set temperature.
The drying device and the drying method for the radioactive zirconium cladding pipe section in the embodiment can realize remote operation, reduce the water content of the radioactive zirconium cladding pipe section to a drying target value, meet the long-term safe storage requirement of the radioactive zirconium cladding pipe section, and fill up the technical blank.
Example 2
As shown in fig. 1, the present embodiment provides a drying device for a radioactive zirconium cladding pipe section, including:
drying mechanism includes: set up the desicator base 6 that is used for holding the encloser bucket 8 in hot chamber 17 and be used for covering and close desicator exhaust hood 7 of 6 open-ended desicator bases, drying mechanism still includes: the cladding barrel 8 is used for containing the radioactive zirconium cladding pipe section, and the cladding barrel 8 is used for containing the radioactive zirconium cladding pipe section;
the sealing mechanism is used for connecting the dryer base 6 with the dryer exhaust hood 7 or the cladding barrel 8 for sealing so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the carrier gas input mechanism is positioned outside the hot chamber 17, the carrier gas input mechanism is connected with the dryer base 6 through a first connecting pipeline 18, the first connecting pipeline 18 penetrates through the hot chamber 17, the carrier gas input mechanism is used for inputting carrier gas into the drying mechanism for drying, and the carrier gas is nitrogen and/or inert gas;
the filtering mechanism is positioned in the hot chamber 17, is connected with the dryer base 6 through a third connecting pipeline 20 and is used for filtering materials discharged by the drying mechanism;
and the suction mechanism is positioned outside the hot chamber 17, is connected with the filtering mechanism through a fourth connecting pipeline 21, the fourth connecting pipeline 21 penetrates through the hot chamber 17, and is used for pumping air to form micro negative pressure.
Preferably, the sealing mechanism includes:
the first sealing air bag 9 is arranged on the dryer base 6, and the inflated first sealing air bag 9 is used for sealing a gap between the opening of the dryer base 6 and the dryer exhaust hood 7 so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the inflation mechanism is positioned outside the hot chamber 17 and is connected with the first sealed airbag 9 through a second connecting pipeline 19, the second connecting pipeline 19 penetrates through the hot chamber 17, and the inflation mechanism is used for inflating the first sealed airbag 9;
and the exhaust mechanism is positioned outside the hot chamber 17, is connected with the first sealed air bag 9 through a second connecting pipeline 19, and is used for exhausting the first sealed air bag 9.
Of course, the first airbag 9 may be provided on the dryer hood 7.
Preferably, the containment shell barrel 8 is provided with a diversion hole 15, and the sealing mechanism further comprises: the second sealing air bag 16 is arranged on the dryer base 6, the inflating mechanism is connected with the second sealing air bag 16 through a second connecting pipeline 19, the exhausting mechanism is connected with the second sealing air bag 16 through the second connecting pipeline 19, the inflating second sealing air bag 16 is used for dividing the space between the dryer base 6 and the cladding barrel 8 into two parts, wherein the connecting part of the first connecting pipeline 18 and the dryer base 6 and the connecting part of the third connecting pipeline 20 and the dryer base 6 are respectively positioned on two sides of the second sealing air bag 16, and the connecting parts of the diversion hole 15, the first connecting pipeline 18 and the dryer base 6 are positioned on the same side of the second sealing air bag 16. The carrier gas enters a gap between the dryer base 6 and the cladding bucket 8 through the first connecting pipeline 18 and then enters the cladding bucket 8 through the diversion holes 15, dries the radioactive zirconium cladding pipe section in the cladding bucket 8, then enters the filtering mechanism through the third connecting pipeline 20, and then enters the suction mechanism through the fourth connecting pipeline 21.
Preferably, the inflation mechanism includes: the inflation gas source 23 and the third valve 1 are sequentially connected, and the third valve 1 is connected with the first sealing air bag 9;
the exhaust mechanism includes: the exhaust pipeline 24 and the fourth valve 14 arranged on the exhaust pipeline 24, wherein the exhaust pipeline 24 is connected with the second connecting pipeline 19;
preferably, the dryer exhaust hood 7 is snap fitted into the dryer base 6 opening.
Preferably, the filter mechanism includes: the efficient filter comprises a medium-efficiency filter 10 and a high-efficiency filter 11 which are sequentially connected, wherein the medium-efficiency filter 10 is connected with a dryer base 6, and the high-efficiency filter 11 is connected with a suction mechanism.
The medium-efficiency filter 10 is used for primary filtration of the dry tail gas, and the filtration efficiency is more than or equal to 85 percent (sodium flame method); the high-efficiency filter 11 is used for efficiently filtering the dry tail gas, and the filtering efficiency is more than or equal to 99.99 percent (by a sodium flame method).
Preferably, the carrier gas input mechanism includes: the dryer comprises a carrier gas source 22, a first valve 2, a heater 3 and a second valve 4 which are connected in sequence, wherein the second valve 4 is connected with a dryer base 6; the first valve 2 is used to open or close the first connection line 18. The second valve 4 is used to open or close the hot carrier gas entering the dryer 5.
The suction mechanism includes: a fifth valve 12 and an aspirator 13 which are connected in sequence, wherein the fifth valve 12 is connected with the filtering mechanism. Specifically, the heater 3 in the present embodiment is an electric heater. The aspirator 13 is an induced draft fan, compressor or other gas conveying device. Specifically, the aspirator 13 in this embodiment is an induced draft fan.
And the dryer exhaust hood 7 is used for forming an atmosphere space isolated from the external environment together with the dryer base 6 and the cladding bucket 8. And the shell barrel 8 is used for containing the radioactive zirconium shell pipe section and providing hot carrier gas to enter the inner diversion hole 15.
And the first sealing air bag 9 is used for forming an independent space for the dryer base 6, the dryer exhaust hood 7 and the shell-wrapping barrel 8 and isolating the gas communication between the dryer 5 and the hot chamber 17.
A dryer base 6 for carrying the containment drum 8 and the radioactive zirconium containment tube section and the dryer exhaust hood 7 and providing a first sealed bladder 9, a second sealed bladder 16.
And the shell barrel 8 is used for containing the radioactive zirconium shell pipe section and providing hot carrier gas to enter the inner diversion hole 15.
And a fifth valve 12 for opening or closing the fourth connecting duct 21.
And the aspirator 13 is used for sucking and drying the tail gas, overcoming the resistance of the medium-efficiency filter 10, the high-efficiency filter 11 and each pipeline and ensuring that the interior of the dryer 5 is in a micro-negative pressure state.
And a fourth valve 14 for exhausting the first sealing air bag 9 and the second sealing air bag 16.
The embodiment also provides a drying method of the drying device using the radioactive zirconium cladding pipe section, which comprises the following steps:
(1) the containment drum 8 containing the radioactive zirconium containment tube segment is placed by a crane into the dryer base 6.
(2) Placing the dryer exhaust hood 7 on the dryer base 6 by a crane;
(3) and opening the third valve 1 to inflate the first sealing air bag 9 on the dryer base 6, so as to realize the isolation of the atmosphere in the dryer 5 from the outside. Specifically, in this embodiment, the pressure of the compressed air is 0.1 MPa;
in this embodiment, the first sealing air bag 9 and the second sealing air bag 16 are all arranged on the dryer base 6, so that the design that a pipeline is arranged on the dryer exhaust hood 7 as a mobile device component and a quick connector needs to be frequently plugged and unplugged is avoided, the process is simplified, and the reliability of the device is improved.
(4) Opening the first valve 2, the second valve 4 and the fifth valve 12, wherein the nitrogen flow is adjustable at 10-75 kg/h;
(5) starting an induced draft fan to enable tail gas at an inlet of the middle-effect filter 10 to reach a set negative pressure value;
preferably, the slight negative pressure can be achieved by suction downstream by an induced draft fan, compressor or other gas delivery device. Specifically, the micro-negative pressure in this embodiment is achieved by downstream suction by the induced draft fan.
(6) Starting an electric heater to reach a preset nitrogen temperature, and drying the radioactive zirconium cladding pipe section;
specifically, in this example, heating was performed by hot nitrogen gas. The electric heater controls the heating power by the nitrogen temperature at the inlet of the dryer 5.
Preferably, the step of drying the shell barrel 8 specifically comprises: the hot nitrogen heats one or several zones of the encasing barrel 8. Specifically, in the present embodiment, several regions of the containment drum 8 are heated, including the drum wall, the drum bottom, and the interior of the containment drum 8. In the embodiment, the optimized airflow hole opening mode of the cladding barrel 8 enables airflow to uniformly pass through the cladding barrel 8 and perform uniform heat exchange with the radioactive zirconium cladding pipe section, so that short circuit of the airflow is prevented.
(7) When the humidity of the drying tail gas reaches a drying target value, the electric heater 3 is closed, and nitrogen is continuously introduced for cooling;
preferably, the conditions for finishing heating the enveloping barrel 8 are as follows: the moisture content of the drying tail gas is lower than a preset drying target value, so that the safety of long-term closed storage and disposal of the radioactive zirconium cladding pipe section waste is ensured.
(8) Stopping introducing nitrogen when the temperature of the drying tail gas reaches a cooling target value;
preferably, the dried envelope is cooled to a temperature below 100 ℃ or to a temperature close to ambient temperature. In the embodiment, the temperature of the cladding is reduced to be below 100 ℃, so that the safety of the zirconium cladding can be ensured, and the overall efficiency of the technological process is improved.
(9) Opening a fourth valve 14 to exhaust the first sealing air bag 9 and the second sealing air bag 16 on the dryer base 6;
(10) the dryer exhaust hood 7 and the cladding bucket 8 are respectively lifted off from the dryer base 6 to complete the drying operation.
Specifically, the carrier gas in this example is nitrogen.
Preferably, the drying target is < 25.86g water/kg gas, cooled to < 100 ℃. Specifically, the drying target value in this example is < 0.32g water/kg gas, and the temperature is reduced < 70 ℃.
Preferably, the drying device is used, and the heating temperature of the heater 3 is 100 to 300 ℃. Specifically, the heating temperature of the heater 3 in this embodiment is 200 ℃.
Preferably, the drying device is used, the filtering efficiency of the medium-efficiency filter 10 is more than or equal to 85%, and the filtering efficiency of the high-efficiency filter 11 is more than or equal to 99.99%.
Preferably, the temperature of the carrier gas introduced into the dryer base 6 is 100 to 300 ℃, the pressure is 0 to 0.1MPa, and the flow rate is 10 to 75 kg/h. Specifically, the temperature of the carrier gas introduced into the dryer base 6 in this embodiment is 200 ℃, the pressure is 0MPa, and the flow rate is 10 kg/h.
The drying device and the drying method for the radioactive zirconium cladding pipe section in the embodiment can realize remote operation, reduce the water content of the radioactive zirconium cladding pipe section to a drying target value, meet the long-term safe storage requirement of the radioactive zirconium cladding pipe section, and fill up the technical blank.
Example 3
This example also provides a drying method using the drying apparatus for the radioactive zirconium clad pipe segment of example 2, which differs from the method of example 2 in that:
the drying target in this example was < 21.57g water/kg gas, the temperature drop was < 25 ℃.
The heating temperature of the heater in this example was 300 ℃.
In this example, the temperature of the carrier gas introduced into the dryer base was 300 ℃, the pressure was 0.1MPa, and the flow rate was 40 kg/h.
Example 4
This example also provides a drying method using the drying apparatus for the radioactive zirconium clad pipe segment of example 2, which differs from the method of example 2 in that:
the drying target in this example was < 2.13g water/kg gas, with a drop in temperature of < 60 ℃.
The heating temperature of the heater in this example was 100 ℃.
In this example, the temperature of the carrier gas introduced into the dryer base was 100 ℃, the pressure was 0.05MPa, and the flow rate was 75 kg/h.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (12)
1. A drying apparatus for a radioactive zirconium clad pipe segment, comprising:
drying mechanism includes: set up the desicator base that is used for holding the involucrum bucket in the hot chamber and be used for covering the desicator exhaust hood that closes desicator base open-ended, drying mechanism still includes: the cladding barrel is used for containing the radioactive zirconium cladding pipe section and is used for containing the radioactive zirconium cladding pipe section;
the sealing mechanism is used for connecting the dryer base with the dryer exhaust hood or the cladding barrel and sealing the dryer base so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the carrier gas input mechanism is positioned outside the hot chamber and is connected with the dryer base through a first connecting pipeline, the first connecting pipeline penetrates through the hot chamber, the carrier gas input mechanism is used for inputting carrier gas into the drying mechanism for drying, and the carrier gas is nitrogen and/or inert gas;
the filtering mechanism is positioned in the hot chamber, is connected with the dryer base through a third connecting pipeline and is used for filtering the materials discharged by the drying mechanism;
the suction mechanism is located outside the hot chamber and is connected with the filtering mechanism through a fourth connecting pipeline, the fourth connecting pipeline penetrates through the hot chamber, and the suction mechanism is used for pumping air to form micro negative pressure.
2. The apparatus for drying a radioactive zirconium clad pipe segment as recited in claim 1, wherein the sealing mechanism comprises:
the first inflatable sealing air bag is arranged on the dryer base and used for sealing a gap between the opening of the dryer base and the exhaust hood of the dryer so as to realize the isolation of the drying mechanism from the ambient atmosphere;
the inflation mechanism is positioned outside the hot chamber and is connected with the first sealed air bag through a second connecting pipeline, the second connecting pipeline penetrates through the hot chamber, and the inflation mechanism is used for inflating the first sealed air bag;
and the exhaust mechanism is positioned outside the hot chamber, is connected with the first sealing air bag through a second connecting pipeline and is used for exhausting the first sealing air bag.
3. The drying device for the radioactive zirconium cladding pipe section according to claim 2, wherein a flow guide hole is formed on the cladding barrel, and the sealing mechanism further comprises: the second sealed airbag, the second sealed airbag sets up on the desicator base, the inflating mechanism is connected with the second sealed airbag through the second connecting tube, the exhaust mechanism is connected with the second sealed airbag through the second connecting tube, the inflated second sealed airbag is used for separating the space between desicator base and the cladding bucket into two parts, wherein, the junction of first connecting tube and desicator base, the junction of third connecting tube and desicator base is located the sealed airbag both sides of second respectively, and the water conservancy diversion hole, the junction of first connecting tube and desicator base is located the homonymy of the sealed airbag of second.
4. The device for drying a radioactive zirconium clad pipe segment according to claim 2 or 3, wherein the gas charging mechanism comprises: the inflation gas source and the third valve are sequentially connected, and the third valve is connected with the first sealing air bag;
the exhaust mechanism includes: exhaust duct, set up the fourth valve on exhaust duct, exhaust duct and second connecting tube are connected.
5. The apparatus of claim 1, wherein the exhaust hood of the dryer is snap-fit into the opening of the dryer base.
6. The apparatus for drying a radioactive zirconium clad pipe segment as recited in claim 1, wherein the filtering mechanism comprises: the middle-effect filter and the high-efficiency filter are connected in sequence, the middle-effect filter is connected with the dryer base, and the high-efficiency filter is connected with the suction mechanism.
7. The apparatus for drying a radioactive zirconium cladding tube segment of claim 1, wherein the carrier gas input mechanism comprises: the dryer comprises a carrier gas source, a first valve, a heater and a second valve which are connected in sequence, wherein the second valve is connected with a dryer base;
the suction mechanism includes: the fifth valve and the aspirator are connected in sequence, and the fifth valve is connected with the filtering mechanism.
8. A drying method using the drying device for the radioactive zirconium cladding pipe section of any one of claims 1 to 7, characterized by comprising the steps of:
placing the cladding barrel containing the radioactive zirconium cladding pipe section into a dryer base;
covering an exhaust hood of the dryer, and sealing by a sealing mechanism to realize the isolation of the drying mechanism from the ambient atmosphere;
inputting carrier gas into the dryer base through a carrier gas input mechanism, drying the cladding barrel and the radioactive zirconium cladding pipe section, and pumping air through a pumping mechanism;
and after the drying target value is reached, stopping inputting carrier gas into the dryer base, and cooling to the set temperature.
9. Drying method according to claim 8, characterised in that the drying target is < 25.86g water/kg gas, the temperature is reduced to < 100 ℃.
10. The drying method according to claim 8, wherein the drying apparatus according to claim 7 is used, and the heating temperature of the heater is 100 to 300 ℃.
11. The drying method according to claim 8, wherein the drying apparatus according to claim 6 is used, wherein the filtration efficiency of the medium efficiency filter is 85% or more, and the filtration efficiency of the high efficiency filter is 99.99% or more.
12. The drying method according to claim 8, wherein the temperature of the carrier gas introduced into the base of the dryer is 100 to 300 ℃, the pressure is 0 to 0.1MPa, and the flow rate is 10 to 75 kg/h.
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| CN115325787A (en) * | 2022-07-22 | 2022-11-11 | 航天晨光股份有限公司 | Drying system and drying method in radioactive wet waste barrel |
| CN115597332A (en) * | 2022-10-25 | 2023-01-13 | 中广核工程有限公司（Cn） | Drying device and drying method |
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Application publication date: 20210817 |