CN208673740U - The adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process - Google Patents
The adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process Download PDFInfo
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- CN208673740U CN208673740U CN201821362260.3U CN201821362260U CN208673740U CN 208673740 U CN208673740 U CN 208673740U CN 201821362260 U CN201821362260 U CN 201821362260U CN 208673740 U CN208673740 U CN 208673740U
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Abstract
The utility model belongs to nuclear fuel post-processing field, and to solve Pu (III) oxidation price adjustment and nitrous acid in existing aftertreatment technology process, to remove device structure existing for equipment complex, using relatively complicated problem, the utility model provides a kind of adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process.The device includes filled column；The filled column lower part is price adjustment section, and top is that sodium nitrite is caught up with except section；The price adjustment section bottom is equipped with oxidant inlet and liquor inlet；The sodium nitrite catch up with except at the top of section bottom or the price adjustment section be equipped with air inlet；The sodium nitrite is caught up with except section outside is equipped with insulation jacket；The sodium nitrite is caught up with except section top is equipped with material liquid outlet and exhaust port.The utility model significantly simplifies the structure of Pu (III) oxidation price adjustment and nitrous acid removing equipment in aftertreatment technology process, reduces manual intervention, simplifies using operation.
Description
Technical field
The utility model belongs to nuclear fuel post-processing field, in particular to 2AF in a kind of nuclear fuel aftertreatment technology process
The adjusting preparation facilities of feed liquid.
Background technique
In nuclear fuel post-processing field, the aftertreatment technology process that China is studied at present uses U (IV)-hydrazine, azanol-hydrazine
Or the reducing agents such as N, N- dimethyl hydroxylamine-methyl hydrazine come reduction reextraction Pu (III), plutonium is in uranium plutonium 1BP feed liquid obtained after separation
Pu (III) need to be adjusted to Pu (IV) by trivalent before next step extraction and back extraction carries out the purification concentration of plutonium；Plutonium is pure simultaneously
Change obtained Pu (III) solution of circulation to need to be converted into when precipitating step of converting Pu (IV), and by nitrous acid remaining in system
It is removed to technic index requirement.In previous design cycle, using sodium nitrite (NaNO2) pass through in annular Flavouring jar and criticize
Formula operates to adjust the valence state of plutonium in 1BP, 2BP feed liquid, i.e., by NaNO2It adds in 1BP, 2BP feed liquid, Oxidative demage is therein also
Former agent and holding reductant, so that aoxidizing Pu (III) is Pu (IV)；Then using blasting the method for air for the nitrous in system
Acid is caught up with except to a certain degree.
However, reaction will escape out big since former price adjustment method and corollary equipment are that directly NOx is passed through in Pu (III) feed liquid
The oxides of nitrogen gas of amount, therefore not only caused the utilization rate of NOx to reduce, but also tail gas disposition burden can be aggravated, and the condiment of batch
Equipment is unfavorable for preventing critical, and when construction needs to meet harsh design standard.For this reason, it may be necessary to establish suitable price adjustment equipment with reality
The continuous operation for technique of now readjusting prices, improves the utilization rate of NOx, reduces the disposition burden of nitrogen oxides tail gas.
A kind of Chinese patent " liquid N2O4For post-processing the new equipment of process 1BP to 2AF condiment " it discloses one kind and is directed to
The oxidation price adjustment of Pu (III) and nitrous acid remove equipment in aftertreatment technology process, and device characteristic is plutonium feed liquid, NOx from dress
Bottom set portion charging, cocurrent reaction, the method although realize price adjustment technique continuous operation, but the oxidation furnaces of Pu (III) and
The removing equipment of nitrous acid belongs to equipment independent, builds and using complex.
Utility model content
Equipment knot existing for equipment is removed to solve Pu (III) oxidation price adjustment and nitrous acid in existing aftertreatment technology process
Structure is complex, and using relatively complicated problem, the utility model provides 2AF material in a kind of nuclear fuel aftertreatment technology process
The adjusting preparation facilities of liquid.
The device includes filled column；The filled column lower part is price adjustment section, and top is that sodium nitrite is caught up with except section；The price adjustment
Section bottom is equipped with oxidant inlet and liquor inlet；The sodium nitrite catch up with except at the top of section bottom or the price adjustment section be equipped with into
Port；The sodium nitrite is caught up with except section outside is equipped with insulation jacket；The sodium nitrite catch up with except be equipped at the top of section material liquid outlet and
Exhaust port.
According to one embodiment, filler used by the filled column can be Raschig ring or Pall ring.
Further, the material of the Raschig ring or Pall ring can be stainless steel material or ceramic material.
According to one embodiment, filler used by the filled column can be random packing.
Further, the size of the random packing is the 1/4~1/15 of filler column diameter.
According to one embodiment, the insulation jacket heat preserving mode can be circulating water heat insulation or electrical heat tracing.
According to one embodiment, demister is also provided at the exhaust port.
According to one embodiment, cyclone separator is also provided at the exhaust port.
Plutonium is aoxidized price adjustment section by the adjusting preparation facilities of 2AF feed liquid in the nuclear fuel aftertreatment technology process of the utility model
It catches up with sodium nitrite except section is integrated in a filled column, significantly simplifies Pu (III) oxidation price adjustment and Asia in aftertreatment technology process
Nitric acid removes the structure of equipment, reduces manual intervention, simplifies using operation.
Detailed description of the invention
Fig. 1 is to prepare dress according to the adjusting of 2AF feed liquid in the nuclear fuel aftertreatment technology process of the utility model embodiment
Set schematic diagram.
Appended drawing reference: 1. price adjustment sections, 2. sodium nitrites are caught up with except section, 3. oxidant inlets, 4. liquor inlet, 5. air inlets,
6. insulation jacket, 7. material liquid outlets, 8. exhaust ports, 9. demisters, 10. cyclone separators.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.?
In specification, the same or similar drawing reference numeral indicates the same or similar component.
In the following detailed description, for convenient for explain, elaborate many concrete details to provide to the utility model
The comprehensive understanding of embodiment.It should be apparent, however, that one or more embodiments without these specific details can also be with
It is carried out.In other cases, well known construction and device is diagrammatically embodied to simplify attached drawing.
Although the utility model is illustrated in conjunction with attached drawing, embodiment disclosed in attached drawing is intended to practical to this
Novel embodiment illustrates, and should not be understood as a kind of limitation to the utility model.In order to clearly show
The details of all parts out, what all parts in attached drawing were not necessarily drawn to scale, so the ratio of all parts in attached drawing
Example also should not be used as a kind of limitation.
As shown in Figure 1, the adjusting preparation facilities of 2AF feed liquid includes in the nuclear fuel aftertreatment technology process of the utility model
Filled column；The filled column lower part is price adjustment section 1, and top is that sodium nitrite is caught up with except section 2；1 bottom of price adjustment section is equipped with oxidation
Agent import 3 and liquor inlet 4；The sodium nitrite catch up with except at the top of 2 bottom of section or the price adjustment section 1 be equipped with air inlet 5；It is described
Sodium nitrite catch up with except outside section 2 be equipped with insulation jacket 6；The sodium nitrite is caught up with and is arranged except being equipped with material liquid outlet 7 and tail gas at the top of section 2
Put mouth 8.
In above-mentioned adjusting preparation facilities, the price adjustment section 1 is used to Pu (III) being oxidized to Pu (IV)；The sodium nitrite
It catches up with and is removed except section 2 is used to pass through nitrous acid remaining in system the air carrying band blasted；Price adjustment section 1 and sodium nitrite are caught up with except section
2 collectively form the filled column, realize the primary adjusting preparation by completing 2AF feed liquid.
According to an example, filler used by the filled column can be Raschig ring or Pall ring, preferably take into account
Plutonium oxidation price adjustment and sodium nitrite are caught up with except this two demands.
Further, the material of the Raschig ring or Pall ring can be stainless steel material or ceramic material.
According to an example, filler used by the filled column can be random packing, be conducive to the side of filler filling
Just.
Further, the size of the random packing is the 1/4~1/15 of filler column diameter, can obtain preferable plutonium oxygen
Change price adjustment and sodium nitrite is caught up with except effect.
According to an example, 6 heat preserving mode of insulation jacket can be circulating water heat insulation or electrical heat tracing, be conducive to
Sodium nitrite is improved to catch up with except effect.
According to an example, it is also provided with demister 9 at the exhaust port 8, convenient for removing the feed liquid generated bubble
Vent gas treatment difficulty is effectively reduced in foam and drop.
According to an example, it is also provided with cyclone separator 10 at the exhaust port 8, prevents from expecting to the full extent
Liquid enters exhaust treatment system, and vent gas treatment difficulty is effectively reduced.
2AF feed liquid in nuclear fuel aftertreatment technology process is handled using the adjusting preparation facilities of the utility model
Main working process is as follows:
Oxidant (nitrogen oxides, or the nitrogen oxides containing partial air or oxygen) is by the oxidant of filler column bottom
Import 3 enters, and trivalent plutonium feed liquid is entered by the liquor inlet 4 of filler column bottom, and the oxidation of trivalent plutonium is realized through price adjustment section 1.Oxygen
Feed liquid after change is flowed up along filled column, and air is blasted into filled column by air inlet 5, is caught up in sodium nitrite except 2 pairs of section
Remaining nitrous acid is reacted in feed liquid carries out carrier band removing.The feed liquid for completing to adjust is discharged by material liquid outlet 7, the reaction tail of generation
After gas removes the feed liquid of carrier band by demister 9, cyclone separator 10, exhaust treatment system is emitted by exhaust port 8.
Hereby it is achieved that a filled column completes the oxidation of trivalent plutonium and catching up with except two functions for nitrous acid.
Embodiment 1
The dimensional parameters for adjusting preparation facilities and using of 2AF feed liquid in the nuclear fuel aftertreatment technology process of the utility model
As follows: filled column total height is 3500mm, and diameter 100mm, air intake height is 1500mm, and filler draws west using stainless steel
Ring, insulation jacket 6 use circulating water heat insulation collet.
It carries out analog material liquid adjusting based on above-mentioned adjusting preparation facilities to test, by Fe (II) generation in Pu (III) analog material liquid
For Pu (III).Analog material liquid composition are as follows: Fe (II) concentration 3g/L, hydrazine concentration 0.1mol/L, hydroxy lamine concentration 0.1mol/L, nitric acid
Concentration 2mol/L, total 400L.
Operation process condition are as follows: analog material liquid processing capacity is 100L/h, N2O4(instead of nitrogen oxides) flow is 2.1L/
H, filled column bottom air flow 200L/h；Air mass flow is 4m in the middle part of filled column3/ h (gas liquid ratio 40), soak cycles water temperature
About 55 DEG C of degree.
The experimental results showed that Fe (II) oxygenation efficiency is greater than 99.9%, concentration of nitric acid 2.4mol/L after oxidation, nitrous acid is dense
Degree is 1.7mmol/L, and indices reach technique requirement；Entire condiment process is more steady, simplifies equipment operation, realizes
The continuous operation for technique of readjusting prices.
Embodiment 2
The dimensional parameters for adjusting preparation facilities and using of 2AF feed liquid in the nuclear fuel aftertreatment technology process of the utility model
As follows: filled column total height is 4500mm, and diameter 120mm, air intake height is 1800mm, and filler is using ceramic Bauer
Ring, insulation jacket 6 use electrical heat tracing collet.
It carries out analog material liquid adjusting based on above-mentioned adjusting preparation facilities to test, by Fe (II) generation in Pu (III) analog material liquid
For Pu (III).Analog material liquid composition are as follows: Fe (II) concentration 2g/L, hydrazine concentration 0.1mol/L, hydroxy lamine concentration 0.1mol/L, nitric acid
Concentration 1.5mol/L, total 400L.
Operation process condition are as follows: analog material liquid processing capacity is 150L/h, N2O4Flow is 3.1L/h, and filler column bottom is empty
Throughput 400L/h；Air mass flow is 6m in the middle part of filled column3/ h (gas liquid ratio 40), holding temperature are about 45 DEG C.
The experimental results showed that Fe (II) oxygenation efficiency is greater than 99.9%, concentration of nitric acid 1.9mol/L after oxidation, nitrous acid is dense
Degree is 3.1mmol/L, and indices reach technique requirement；Entire condiment process is more steady, simplifies equipment operation, realizes
The continuous operation for technique of readjusting prices.
Although being shown and having illustrated according to some embodiments of the utility model general plotting, however, this field is common
It should be understood to the one skilled in the art that in the case where the principle of the general plotting without departing substantially from the utility model and spirit, it can be to these realities
It applies example to make a change, the scope of the utility model is limited with claim and their equivalent.
Claims (8)
1. the adjusting preparation facilities of 2AF feed liquid in a kind of nuclear fuel aftertreatment technology process, it is characterised in that: the device includes filling out
Stock column；The filled column lower part is price adjustment section, and top is that sodium nitrite is caught up with except section；The price adjustment section bottom is equipped with oxidant inlet
And liquor inlet；The sodium nitrite catch up with except at the top of section bottom or the price adjustment section be equipped with air inlet；The sodium nitrite is caught up with
Except section outside is equipped with insulation jacket；The sodium nitrite is caught up with except section top is equipped with material liquid outlet and exhaust port.
2. the adjusting preparation facilities of 2AF feed liquid, feature exist in nuclear fuel aftertreatment technology process according to claim 1
In: filler used by the filled column can be Raschig ring or Pall ring.
3. the adjusting preparation facilities of 2AF feed liquid, feature exist in nuclear fuel aftertreatment technology process according to claim 2
In: the material of the Raschig ring or Pall ring can be stainless steel material or ceramic material.
4. the adjusting preparation facilities of 2AF feed liquid, feature exist in nuclear fuel aftertreatment technology process according to claim 1
In: filler used by the filled column can be random packing.
5. the adjusting preparation facilities of 2AF feed liquid, feature exist in nuclear fuel aftertreatment technology process according to claim 4
In: the size of the random packing is the 1/4~1/15 of filler column diameter.
6. the adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process according to claim 1-5,
It is characterized by: the insulation jacket heat preserving mode can be circulating water heat insulation or electrical heat tracing.
7. the adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process according to claim 1-5,
It is characterized by: being also provided with demister at the exhaust port.
8. the adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process according to claim 1-5,
It is characterized by: being also provided with cyclone separator at the exhaust port.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108922645A (en) * | 2018-08-23 | 2018-11-30 | 中国原子能科学研究院 | The adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108922645A (en) * | 2018-08-23 | 2018-11-30 | 中国原子能科学研究院 | The adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process |
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