JPH01312494A - Off-gas treating apparatus in reprocessing plant - Google Patents
Off-gas treating apparatus in reprocessing plantInfo
- Publication number
- JPH01312494A JPH01312494A JP63142953A JP14295388A JPH01312494A JP H01312494 A JPH01312494 A JP H01312494A JP 63142953 A JP63142953 A JP 63142953A JP 14295388 A JP14295388 A JP 14295388A JP H01312494 A JPH01312494 A JP H01312494A
- Authority
- JP
- Japan
- Prior art keywords
- nitric acid
- recovered
- concentrator
- acid
- absorption tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012958 reprocessing Methods 0.000 title claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 53
- 238000010521 absorption reaction Methods 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 239000002253 acid Substances 0.000 claims abstract description 27
- 229910052740 iodine Inorganic materials 0.000 claims description 24
- 239000011630 iodine Substances 0.000 claims description 24
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 23
- 238000004090 dissolution Methods 0.000 claims description 11
- 239000002915 spent fuel radioactive waste Substances 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 150000002496 iodine Chemical class 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 229940074355 nitric acid Drugs 0.000 abstract 7
- 239000012530 fluid Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 29
- 238000010586 diagram Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- 241000219122 Cucurbita Species 0.000 description 1
- 235000009852 Cucurbita pepo Nutrition 0.000 description 1
- 229910052778 Plutonium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はオフガス処理装置に係わり、特に硝酸を回収す
るのに好適な再処理プラントのオフガス処理装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an off-gas treatment device, and particularly to an off-gas treatment device for a reprocessing plant suitable for recovering nitric acid.
核燃料再処理工場においては、使用済み燃料を濃硝酸に
より溶解し、燃料として再使用できるウラン、プルトニ
ウム等の物質が回収されている。At nuclear fuel reprocessing plants, spent fuel is dissolved with concentrated nitric acid to recover substances such as uranium and plutonium that can be reused as fuel.
使用済核燃料を濃硝酸で溶解する工程で、オフガスが発
生し、さらにこのガスとともに使用済核燃料中のヨウ素
等の発揮性ＦＰ（核分裂生成物）が放出される。In the process of dissolving spent nuclear fuel with concentrated nitric acid, off-gas is generated, and along with this gas, active FPs (fission products) such as iodine in the spent nuclear fuel are released.
第６図は、従来のこの種のオフガス処理案の系統図であ
る。この装置は、使用済燃料を濃硝酸で溶解する溶解槽
３と、溶解槽３からの溶解液中に溶解しているヨウ素を
追い出すヨウ素追出槽４と、溶解槽３及びヨウ素追出槽
４から発生するオフガス中の大部分の水蒸気を凝縮する
コンデンサ５と、オフガス中のＮＯｘを吸収除去するＮ
Ｏｘ吸収塔６と、コンデンサ５からの凝縮液及びＮＯｘ
吸収塔６からの吸収酸液を貯留する吸収酸液貯槽７と、
吸収酸液貯槽７中のヨウ素を追い出すヨウ素再追出塔９
と、ヨウ素再追出塔９で回収された回収酸液を貯留する
回収酸液貯槽１０と、ヨウ素を吸着剤で吸着除去するヨ
ウ素除去塔１３とから主として構成される。FIG. 6 is a system diagram of a conventional off-gas treatment plan of this type. This device consists of a dissolution tank 3 that dissolves spent fuel with concentrated nitric acid, an iodine removal tank 4 that drives out iodine dissolved in the solution from the dissolution tank 3, and a dissolution tank 3 and an iodine removal tank 4. A condenser 5 condenses most of the water vapor in the off-gas generated from the condenser 5, and a N condenser 5 that absorbs and removes NOx in the off-gas.
Ox absorption tower 6 and condensate and NOx from condenser 5
an absorption acid liquid storage tank 7 that stores the absorption acid liquid from the absorption tower 6;
Iodine re-expulsion tower 9 for expelling iodine from the absorption acid liquid storage tank 7
, a recovered acid solution storage tank 10 that stores the recovered acid solution recovered in the iodine re-extraction column 9, and an iodine removal column 13 that adsorbs and removes iodine with an adsorbent.
前記ＮＯｘ吸収塔６は、第５図のＮＯｘ吸収塔の詳細断
面図に示すように棚段式となっており、複数の棚段５０
と、吸収液降下管５１と、Ｎｏχ吸収効果を高めるため
に棚段５０に挿入される冷却コイル５２とからなる。The NOx absorption tower 6 is of a tray type, as shown in the detailed sectional view of the NOx absorption tower in FIG. 5, and has a plurality of trays 50.
, an absorption liquid downcomer pipe 51, and a cooling coil 52 inserted into the shelf 50 to enhance the Nox absorption effect.
このようなオフガス処理装置において、溶解槽３および
ヨウ素追出槽４から発生したオフガス１８は、コンデン
サ５に送られ、大部分の水蒸気が凝縮される。この凝縮
液は、ＮＯｘ吸収塔６の吸収液として使用される。コン
デンサ５で水蒸気が除かれたガスは、ＮＯｘ吸収塔６の
下部に供給され、ＮＯｘ吸収塔６の上部ノズルから供給
される吸収液によってガス中のＮＯｘが吸収除去される
。In such an off-gas processing apparatus, the off-gas 18 generated from the dissolution tank 3 and the iodine expulsion tank 4 is sent to the condenser 5, where most of the water vapor is condensed. This condensate is used as an absorption liquid in the NOx absorption tower 6. The gas from which water vapor has been removed in the condenser 5 is supplied to the lower part of the NOx absorption tower 6, and NOx in the gas is absorbed and removed by the absorption liquid supplied from the upper nozzle of the NOx absorption tower 6.
コンデンサ５からの凝縮液およびＮＯｘ吸収塔６からの
吸収酸液には多量のヨウ素が混入しているため、これら
は吸収酸液貯槽７に貯留される。吸収酸液貯槽７の吸収
酸液は、ヨウ素再追出塔９に送られ、ヨウ素が追い出さ
れた回収酸液は回収酸液貯槽１０に貯留された後、硝酸
濃縮器３１に供給され、ここでスチーム６３により加熱
されて溶解液として再使用のための濃度調整が行われた
後、溶解槽３へ送られる。Since a large amount of iodine is mixed in the condensate from the condenser 5 and the absorption acid liquid from the NOx absorption tower 6, these are stored in the absorption acid liquid storage tank 7. The absorbed acid liquid in the absorption acid liquid storage tank 7 is sent to the iodine re-expelling tower 9, and the recovered acid liquid from which iodine has been expelled is stored in the recovered acid liquid storage tank 10, and then supplied to the nitric acid concentrator 31, where it is After being heated by steam 63 and adjusting the concentration for reuse as a dissolving solution, it is sent to the dissolving tank 3.
一方、ＮＯｘ吸収塔６およびヨウ素再追出塔９から出た
ガスは混合され、予熱器１２で１５０ ’Ｃにまで予熱
され、ガス中の相対湿度が下げられた後、吸着剤を充填
したヨウ素除去塔１３に送ら瓢オフガス系に流入する大
部分のヨウ素が除去される。ヨウ素が除去されたガスは
冷却器１４で冷却された後、フィルタ１５を通過し、ブ
ロア１６により排気筒１に移送され、放出される。On the other hand, the gases discharged from the NOx absorption tower 6 and the iodine re-expulsion tower 9 are mixed, preheated to 150'C in a preheater 12, and the relative humidity in the gas is lowered. Most of the iodine sent to the removal column 13 and flowing into the gourd off-gas system is removed. The gas from which iodine has been removed is cooled by a cooler 14, passes through a filter 15, is transferred to the exhaust stack 1 by a blower 16, and is discharged.
上記従来技術においては、オフガス中のＮＯｘを湿式法
により硝酸（ＨＮＯ３）として回収し、再び溶解槽で利
用している。溶解槽でのＨＮ Ｏｓ濃度は使用済核燃料
を溶解させるため、６〜７Ｎ（規定）であることが必要
である。In the above-mentioned conventional technology, NOx in the off-gas is recovered as nitric acid (HNO3) by a wet method and used again in the dissolution tank. The HNOs concentration in the dissolution tank needs to be 6 to 7 N (regular) in order to dissolve the spent nuclear fuel.
しかしながら、燃料棒６０は、第３図（Ａ）に示すよう
に棒軸方向端部（Ａ部）と棒軸方向中心部（Ｂ部）の成
分組成等が異なっている。このため、この燃料棒６０を
ＨＮＯ，に溶解した場合、第３図（Ｂ）に示すように燃
料棒のＡ部から発生するＮＯｘ量は多く、一方、燃料棒
のＢ部から発生するＮＯｘ量は少ないため、オフガス中
のＮＯｘ濃度が周期的に変動する。このため回収硝酸濃
度も周期的に変動する。However, as shown in FIG. 3(A), the fuel rod 60 has different compositions at the rod axial end (section A) and at the rod axial center (section B). Therefore, when this fuel rod 60 is dissolved in HNO, the amount of NOx generated from part A of the fuel rod is large, as shown in FIG. 3(B), and the amount of NOx generated from part B of the fuel rod is large. Since the NOx concentration in the off-gas is small, the NOx concentration in the off-gas fluctuates periodically. For this reason, the concentration of recovered nitric acid also fluctuates periodically.
そこで、回収硝酸濃度を６〜７Ｎ（規定）に調節するた
めの硝酸濃縮器３１を設け、回収酸を濃縮している。し
かし、第４図に示すように硝酸濃縮器出口液中の硝酸濃
度は、オフガス中のＮＯｘ濃度にほぼ対応するＨＮＯ＊
ｆＡ縮雑器人口濃度より多少変動する。このため、硝
酸濃縮器における濃縮は高めに行うことになり発生する
蒸気Ｎ−ｔｚＯ１ＨＮＯ３）量は多くなる。このとき、
発生する蒸気は別プロセスのガス（ベッセルオフガス等
）に導かれて処理される。このためプロセスが複雑とな
り、経済的にも割高なプロセスとなっている。Therefore, a nitric acid concentrator 31 is provided to adjust the concentration of recovered nitric acid to 6 to 7 N (regular), and the recovered acid is concentrated. However, as shown in Figure 4, the nitric acid concentration in the nitric acid concentrator outlet liquid is HNO*, which approximately corresponds to the NOx concentration in the offgas.
The fA condenser population concentration varies somewhat. For this reason, the concentration in the nitric acid concentrator is performed at a higher level, and the amount of generated steam (N-tzO1HNO3) increases. At this time,
The generated steam is led to another process gas (vessel off gas, etc.) and processed. This makes the process complicated and economically expensive.
本発明の目的は、上記した従来技術の課題を解決し、回
収硝酸濃度を安定的に一定として、系外へ廃液を出すこ
となくクローズドシステムとすることができる再処理プ
ラントのオフガス処理装置を捉供することにある。The purpose of the present invention is to solve the problems of the prior art described above, and to provide an off-gas treatment device for a reprocessing plant that can maintain a stable concentration of recovered nitric acid and create a closed system without discharging waste liquid outside the system. It is about providing.
上記目的は、回収酸を核燃料等の溶解用として使用する
ために調整する硝酸濃縮器から発生する蒸気を冷却して
得られる凝縮液をＮＯｘ吸収塔に循環することにより達
成される。The above object is achieved by circulating the condensate obtained by cooling the steam generated from the nitric acid concentrator, which prepares the recovered acid for use in dissolving nuclear fuel, etc., to the NOx absorption tower.
すなわち本発明は、硝酸濃縮器からの蒸気を凝縮器で回
収し、その回収凝縮液をＮＯｘ吸収塔に循環させるライ
ンを設けたことを特徴とする特［作用］
回収酸を凝縮する際、発生する蒸気を冷却し、その凝縮
液をＮＯｘ吸収塔で再利用するので、回収酸を調整する
プロセスで発生する蒸気は、ＮＯｘ吸収塔の吸収液とし
て有効利用される。That is, the present invention is characterized in that a line is provided for recovering vapor from the nitric acid concentrator in a condenser and circulating the recovered condensate to the NOx absorption tower. The steam generated during the process of adjusting the recovered acid is effectively used as the absorption liquid for the NOx absorption tower.
また、ＮＯｘ吸収塔に硝酸を含む回収凝縮液が供給され
るために、ＮＯｘ吸収塔における孔食を防止できる。Further, since the recovered condensate containing nitric acid is supplied to the NOx absorption tower, pitting corrosion in the NOx absorption tower can be prevented.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は、本発明におけるオフガス処理装置の系統図で
ある。第１図において第６図と同一部分は同一符号を付
して構成上の説明を省略する。図において、第６図の従
来装置と異なる点は、硝酸４縮器３１からの蒸気を凝縮
器３３で回収し、その回収凝縮液をタンク２に供給する
ラインを設けたことである。FIG. 1 is a system diagram of an off-gas treatment apparatus according to the present invention. In FIG. 1, the same parts as those in FIG. 6 are given the same reference numerals, and a description of the structure will be omitted. In the figure, the difference from the conventional apparatus shown in FIG. 6 is that a line is provided to recover vapor from a nitric acid 4-condenser 31 in a condenser 33 and supply the recovered condensate to a tank 2.
また、硝酸濃縮器３１の回収硝酸濃度を一定にするため
硝酸濃縮器３１の出口に硝酸濃度検出器３５を設け、そ
の信号に基づいて制御器３４により流量制御弁３２を作
動させ、硝酸ｆｉ縮器３１内の伝熱管に供給されるスチ
ーム６３量を調整して硝酸濃縮器３１の温度をコントロ
ールするようになっている。In addition, in order to keep the concentration of nitric acid recovered in the nitric acid concentrator 31 constant, a nitric acid concentration detector 35 is provided at the outlet of the nitric acid concentrator 31, and a flow rate control valve 32 is operated by a controller 34 based on the signal from the nitric acid concentration detector 35. The temperature of the nitric acid concentrator 31 is controlled by adjusting the amount of steam 63 supplied to the heat exchanger tube in the vessel 31.
本発明による試験結果の一例を第２図に示す。An example of the test results according to the present invention is shown in FIG.
第２図（Ａ）に示すように従来のオフガス処理装置にお
いては、ある程度の廃液が生じるが、本発明において、
回収酸は溶解Ｉ！３及びＮＯｘ吸収塔６にそれぞれ循環
して使用され、クローズドシステムとなっているので、
廃液は雰である。As shown in FIG. 2(A), in the conventional off-gas treatment equipment, a certain amount of waste liquid is generated, but in the present invention,
The recovered acid dissolves! 3 and NOx absorption tower 6, making it a closed system.
The waste liquid is atmosphere.
また、第２図（Ｂ）に示すように本発明では、凝縮器３
３で回収された回収凝縮液は、ＮＯｘ吸収塔６における
吸収液として使用されるから従来の装置に比較して吸収
液としての水の補給量を低減できる。Furthermore, as shown in FIG. 2(B), in the present invention, the condenser 3
Since the recovered condensate recovered in step 3 is used as an absorption liquid in the NOx absorption tower 6, the amount of water to be replenished as an absorption liquid can be reduced compared to conventional devices.
さらに上記のような本発明のオフガス処理装置において
は、回収酸液中の硝酸濃度が変動した場合にも、硝酸濃
縮器３１における加熱温度を調整することにより溶解槽
３に循環させる液中の硝酸濃度を、溶解液として必要な
６〜７Ｎ（規定）に保持することができ、しかもそのと
き発生する蒸気中に含まれる硝酸は、ＮＯｘ吸収塔６に
循環され、吸収液として利用される。したがって、第２
図（Ｃ）に示すように本発明では、従来の装置に比較し
て回収硝酸濃度をほぼ一定の値に保持することができる
。Furthermore, in the above-described off-gas treatment apparatus of the present invention, even when the nitric acid concentration in the recovered acid liquid fluctuates, the heating temperature in the nitric acid concentrator 31 is adjusted to reduce the nitric acid in the liquid circulated to the dissolution tank 3. The concentration can be maintained at 6 to 7 N (normal) required for a dissolving liquid, and the nitric acid contained in the vapor generated at that time is circulated to the NOx absorption tower 6 and used as an absorbing liquid. Therefore, the second
As shown in Figure (C), in the present invention, the concentration of recovered nitric acid can be maintained at a substantially constant value compared to the conventional apparatus.
また、硝酸を含む凝縮液を吸収液として使用するため、
ＮＯｘ吸収塔６の供給液部の装置の孔食を防止すること
ができる。装置部材の孔食が生じる条件は、ヨウ素が共
存し、かつ液相組成として硝酸を含む系統内である。In addition, since condensate containing nitric acid is used as an absorption liquid,
Pitting corrosion of the device in the feed liquid section of the NOx absorption tower 6 can be prevented. The conditions under which pitting corrosion of device members occurs is in a system in which iodine coexists and nitric acid is included in the liquid phase composition.
この場合、装置構成部材によっては、ヨウ素を同伴して
も特に硝酸濃度が１規定以上のとき、孔食は全く生じな
い、したがって、凝縮器３３からの回収凝縮液の硝酸濃
度に応じて、タンク２に供給される純粋の量を調整すれ
ば、ＮＯｘ吸収塔６における孔食を確実に防止すること
ができる。In this case, depending on the device component, even if iodine is entrained, pitting corrosion will not occur at all, especially when the nitric acid concentration is 1N or more. Therefore, depending on the nitric acid concentration of the collected condensate from the condenser By adjusting the amount of pure water supplied to NOx absorption tower 2, pitting corrosion in NOx absorption tower 6 can be reliably prevented.
硝酸濃縮器３１における濃縮方法としては、上記方法の
他、減圧による方法、膜による方法がある。Concentration methods in the nitric acid concentrator 31 include, in addition to the above methods, a method using reduced pressure and a method using a membrane.
（発明の効果］
本発明によれば、オフガス処理装置において、回収硝酸
濃度を安定的に一定として、凝縮器が回収された回収凝
縮液をＮＯｘ吸収塔に循環させて使用するので、系外へ
廃液を出すことなく、クローズドシステムとなり、安全
性の高いプロセスとなる。(Effects of the Invention) According to the present invention, in the off-gas treatment device, the concentration of recovered nitric acid is kept stably constant, and the recovered condensate is circulated by the condenser to the NOx absorption tower for use, so that the recovered condensate is used outside the system. It is a closed system with no waste liquid, making it a highly safe process.
第１図は本発明におけるオフガス処理装置の系統図、第
２図は本発明におけるオフガス処理試験結果の一例を示
す図、第３図はオフガス中のＮ。
ｘｆＡ度の変動を示す図、第４図は回収硝酸濃度変化を
示す図、第５図はＮＯｘ吸収塔の詳細断面１第６図は従
来のオフガス処理装置の系統図である。
３・・・・・・溶解槽、４・・・・・・ヨウ素追出槽、
５・・・・・・コンデンサ、６・・・・・・ＮＯｘ吸収
塔、７・・・・・・吸収酸液貯槽、９・・・・・・ヨウ
素再追出塔、１０・・・・・・回収酸液貯槽、１２・・
・・・・予熱器、１３・・・・・・ヨウ素除去塔、３１
・・・・・・硝酸ｉ４縮器、３２・・・・・・流量制御
弁、３３・・・・・・凝縮器、３４・・・・・・制御器
、３５・・・・・・硝酸濃度検出器。
代理人 弁理士 西 元 勝 −
第２図
時間−
第３図
（Ａ） ＣＢ）時間
（ｈｌ −
第４図
Ｍ、間 （ｈ）□FIG. 1 is a system diagram of an off-gas treatment apparatus according to the present invention, FIG. 2 is a diagram showing an example of off-gas treatment test results according to the present invention, and FIG. 3 is a diagram showing N in off-gas. FIG. 4 is a diagram showing changes in the concentration of recovered nitric acid, FIG. 5 is a detailed cross-section 1 of the NOx absorption tower, and FIG. 6 is a system diagram of a conventional off-gas treatment device. 3...Dissolution tank, 4...Iodine expulsion tank,
5... Condenser, 6... NOx absorption tower, 7... Absorbing acid liquid storage tank, 9... Iodine re-expelling tower, 10...・・Collected acid liquid storage tank, 12・・
... Preheater, 13 ... Iodine removal tower, 31
... Nitric acid i4 condenser, 32 ... Flow rate control valve, 33 ... Condenser, 34 ... Controller, 35 ... Nitric acid Concentration detector. Agent Patent Attorney Masaru Nishimoto - Figure 2 Time - Figure 3 (A) CB) Time (hl - Figure 4 M, Interval (h) □
Claims (2)
等からのガス中のＮＯｘを吸収するＮＯｘ吸収塔と、こ
のＮＯｘ吸収塔からの吸収酸液を貯留する吸収酸液貯槽
と、この吸収酸液貯槽に貯留された吸収酸液が供給され
、吸収酸液中のヨウ素を液中から追い出すためのヨウ素
再追出塔と、このヨウ素再追出塔からの回収酸液中の硝
酸濃度を調整して前記溶解槽に供給するための硝酸濃縮
器と、を備えたものにおいて、前記硝酸濃縮器からの蒸
気を凝縮して回収する凝縮器と、この凝縮器で回収され
た回収凝縮液を前記ＮＯｘ吸収塔に循環させるラインを
設けたことを特徴とする再処理プラントの再処理オフガ
ス処理装置。(1) A dissolution tank that dissolves spent nuclear fuel, etc., a NOx absorption tower that absorbs NOx in gas from this dissolution tank, etc., and an absorption acid liquid storage tank that stores the absorbed acid liquid from this NOx absorption tower, The absorption acid liquid stored in this absorption acid liquid storage tank is supplied with an iodine re-extraction tower for expelling iodine in the absorption acid liquid from the liquid, and nitric acid in the acid liquid recovered from this iodine re-extraction tower. A nitric acid concentrator for adjusting the concentration and supplying it to the dissolution tank, the condenser condensing and recovering the vapor from the nitric acid concentrator, and the recovered condensate recovered by the condenser. A reprocessing off-gas treatment device for a reprocessing plant, characterized in that a line for circulating liquid to the NOx absorption tower is provided.
する硝酸濃度検出器と、この硝酸濃度検出器における検
出信号に基づいて前記硝酸濃縮器内の吸収酸液に対する
加熱を調整する手段を設けたことを特徴とする請求項（
１）記載の再処理プラントのオフガス処理装置。(2) A nitric acid concentration detector for detecting the nitric acid concentration of the absorbed acid solution at the outlet of the nitric acid concentrator, and means for adjusting the heating of the absorbed acid solution in the nitric acid concentrator based on a detection signal from the nitric acid concentration detector. A claim characterized in that (
1) The off-gas treatment device of the reprocessing plant described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63142953A JPH01312494A (en) | 1988-06-10 | 1988-06-10 | Off-gas treating apparatus in reprocessing plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63142953A JPH01312494A (en) | 1988-06-10 | 1988-06-10 | Off-gas treating apparatus in reprocessing plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01312494A true JPH01312494A (en) | 1989-12-18 |
Family
ID=15327493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63142953A Pending JPH01312494A (en) | 1988-06-10 | 1988-06-10 | Off-gas treating apparatus in reprocessing plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01312494A (en) |
-
1988
- 1988-06-10 JP JP63142953A patent/JPH01312494A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR910008360B1 (en) | Method of vacuum degassing and refilling a reactor coolant system | |
| US5582812A (en) | Process for gas phase conversion of diethylzinc to zinc oxide powder | |
| RU2596816C1 (en) | Method of concentrating radioactive wastes | |
| US4432955A (en) | Process for desorbing fission iodine from nitric acid fuel solution | |
| JPH01312494A (en) | Off-gas treating apparatus in reprocessing plant | |
| GB1594370A (en) | Treatment of waste | |
| US6132688A (en) | Method and apparatus for treating exhaust gas from a semiconductor fabrication machine | |
| GB2239451A (en) | A method of and apparatus for reducing the iodine content in a nitric acid nuclear fuel solution | |
| KR20220108818A (en) | How to concentrate liquid radioactive waste | |
| RU2460160C1 (en) | Cleaning and deactivation method of reactor plant equipment with liquid-metal lead-bismuth heat carrier | |
| JPH01232297A (en) | Retreated off-gas treatment equipment | |
| JPH054639B2 (en) | ||
| JPH077095B2 (en) | How to stop the offgas treatment equipment | |
| JPH0278998A (en) | Nox absorption tower in equipment for treating offgas of retreatment | |
| JPH01227998A (en) | Reprocessed off-gas processing device | |
| JPH01101499A (en) | Treatment of retreatment off-gas | |
| JPH0574038B2 (en) | ||
| BE1001746A4 (en) | PROCESS FOR THE TREATMENT OF BORON CARBON IRRADIATED TO NEUTRONS, COMPRISING COMPENSATION ELEMENTS OR STOPPING ELEMENTS OF NUCLEAR REACTORS. | |
| Jayan et al. | A STUDY ON THE DESIGN OF THERMOSYPHON EVAPORATOR USED IN NUCLEAR WASTE VOLUME REDUCTION METHOD | |
| JP2864180B2 (en) | Treatment method of nitric acid aqueous solution containing radioactive substances | |
| JPH07287096A (en) | Method of treating ruthenium and method and apparatus for treating radioactive fluid waste | |
| JPS63277998A (en) | Device for treating retreated off gas | |
| JPH01116499A (en) | Retreated offgas processor | |
| JP2895267B2 (en) | Reactor water purification system | |
| Eister | The Treatment of Radioactive Wastes |