Ϊ299874 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種由鉻合金所構成的燃料元件箱之熱處理 用之方法和裝置。燃料元件箱形成沸水式反應器之燃料元件 之外罩。在反應器中的輻射期間，燃料元件箱會經歴尺寸之 改變，例如，箱之長度會改變，扭曲或擴大。此種尺寸上的 改變是與材料組織有關，其在表層製程中會受到調整。在反 應器中操作時爲了使與組織有關的尺寸穩定性獲得改良，則 φ 在燃料元件箱中在製程進行時須藉由熱處理來去除原來的 表層組織。燃料元件箱在製程中因此連續地經由熱處理裝置 而移動且以縱向區段方式藉助於抓握在其周圍之感應式加 熱區而在/3相位區中加熱，且一種已加熱的縱向區段在離開 加熱區之後在一種冷卻區中冷卻至α相位區中的溫度。因 此，會由於表層材料中典型組織之去除而造成結晶學上晶粒 之不規則的分佈。加熱作用大部份是藉助於感應式繞組來達 成，冷卻則以水或鈍氣來達成。 【先前技術】 先前技術中加熱作用大部份是藉助於感應式繞組來達 成，冷卻則以水或鈍氣來達成。 【發明內容】 本發明的目的是提供另一種方法以對由锆合金所構成的 燃料元件箱進行熱處理且提供一適用於此方法之裝置’其 在進行本方法時可針對燃料元件箱之加熱和冷卻提供一種 較多的變化性。 上述就方法而言是以申請專利範圍第1項來達成，就裝 1299874 置而言是以申請專利範圍第1 4項來達成。 申請專利範圍第1項設計一方法，其中熱處理是藉助於 - g少二個在該箱之縱向中互相隔開且獨立地操作之加熱裝 • 置（其分別具有至少一感應式繞組）來達成’一種進入加熱區 中的箱區段以第一加熱裝置來加熱且隨後以一種功率較第 一加熱裝置還低的第二加熱裝置來進行熱處理。 二段式加熱之優點是：在與只以一種繞組來進行的熱處 理比較時，可正確地調整出所期望的額定溫度且就熱處理 φ 而言可達到較大的可變化性。較佳是以第一階段藉由功率 調整來進行加熱直至位於/3相位區中的額定溫度附近爲 止。尺寸較微小的第二感應式繞組用來繼續加熱至額定溫 > 度。由於第二繞組較小的功率，則由其所產生的感應式熱 . 量可較準確地受到控制，使額定溫度可調整至可再生的正 確値。 由於燃料元件箱之幾何形式而會在其角隅區域中造成大 的感應性耦合作用，結果會使角耦區域中受加熱的程度較 Φ壁區中者還大。若此種未均勻地加熱之燃料元件箱在α相 位區中冷卻，則會有以下的危險性：角隅區域中和壁區中 會形成不同的材料參數。藉由本發明二階段式的加熱可防 止上述之危險性。由於第二加熱裝置中小很多的感應，則 角隅區域之較大的加熱效應較小且因此只在一種小很多的 範圍中才可察覺。 熱處理的另一較佳的方式是：離開第一加熱元件之箱區 段之冷卻是以第二加熱元件來控制而延遲，此時一較小的 1299874 熱量傳送至該區段。利用此種方法’ 一個箱區段之停留時 間可延長至63(^0以上的溫度範圍中’以達成一種適當的顆 粒生長以及使二次沈積擴大。此種受控制的冷卻現在只有 當以水而不是以鈍氣來冷卻時才有可能。在與二段式熱處 理相結合之下，可使用各種不同的可能方式以一方面控制 熱量的載入且另一方面控制熱量的排出。 例如，很微細的中間金屬相位和或二次相位（其在快速冷 卻時形成）通常是不適當的。在燃料元件箱停留在準沸水式 φ 反應器中很長一段時間時，其在高的燃耗下即屬此種情 況，則中間金屬相位是不利的，此乃因其會造成很均勻的 腐蝕。 -就調整技術上的觀點而言，應使方法進行時最佳化，此 時第一加熱裝置在功率上進行調整且第二加熱裝置在溫度 上進行調整，其中須進行該箱之溫度之無接觸式之測量， 特別是藉助於二彩色式-或商數（Quotient)高溫計來進行。 與二級式感應式熱處理相組合所進行之鈍氣冷卻法所顯 @示的優點是：燃料元件箱之表面不會增長或不能套上氧化 層，氧化層在熱處理之後須以昂貴的方式再去除。在此種 情況下在熱處理時可保持鈍氣墊時是有利的，其在箱之縱 向中經由加熱區和冷卻區而延伸。 在一特別有利的方法中，鈍氣墊保持在一種相對於燃料 元件箱而移動-且抓握在燃料元件箱周圍的外殼中。鈍氣墊 之軸向長度因此等於外殼之長度。燃料元件箱和加熱區或 冷卻區之間的相對速率，鈍氣墊之長度和供應至冷卻器之 1299874 鈍氣量因此須互相調整，使離開鈍氣墊之箱區具有一種較 各別使用之箱材料之增長溫度還低的溫度。亦可使整個燃 料元件箱配置在一種室中，該室中保持著一種在燃料元件 箱之整個長度上延伸的鈍氣墊。 各別地控制燃料元件箱之冷卻所用之另一種可能方式 是：在冷卻區中除了鈍氣冷卻之外另藉助於圍繞燃料元件 箱之以一種流體（例如，水）來冷卻之冷卻體來進行冷卻。在 熱處理時爲了防止燃料元件箱內面之氧化，則燃料元件箱 # 中須保持一種鈍氣大氣。在另一種較佳的方法中，在熱處 理時燃料元件箱在位置上保持著固定且加熱區和冷卻區 在箱之縱向中移動。以此種方式可使此裝置的構造高度下 •降。 一種達成上述目的之裝置包含一加熱區，其具有至少一 第一加熱裝置和至少一第二加熱裝置’其在操作方向中位 於第一加熱裝置之後，其中各加熱裝置分別具有至少一抓 握在燃料元件箱周圍之感應式繞組’且其中第一加熱裝置 所具有的功率大於第二加熱裝置。此外，本裝置包含一種 形成冷卻區用之冷卻裝置，其配置在距加熱區一軸向距離 處且包含至少一噴嘴，藉此噴嘴可使鈍氣流在整個範圍中 導入至燃料元件箱之外表面。 外殼形成一種承載體以承載至少一種感應式繞組和至少 一鈍氣噴嘴且形成燃料元件箱（其包含鈍氣墊）用之外部邊 界。純氣墊是由噴嘴所流出的鈍氣所形成。 較佳是至少一感應式線圈配置在外殼的外周’其中此外 1299874 殻至少在一由感應式繞組所圍繞的區域中是由一種可透過 電磁場的材料所構成。由於空間上的原因，感應式繞組配 " 置在外殼的外周是有利的。此外，由外殼內部中的高溫所 • 造成的熱影響可下降。 如上所述，就調整技術上的觀點而言二段式的加熱是有 利的。爲了達成此目的而依序形成的感應式繞組是藉由一 種配置在其間的屏蔽件來隔開，特別是藉由一種抓握在外 殼外部周圍的由導電材料所構成的凸緣來隔開。 • 冷卻用的噴嘴具有多個出口，其對準燃料元件箱之外表 面。因此，燃料元件箱可在周圍方向中均勻地被冷卻。亦 可設有一種環形的噴嘴，其在使用狀態下可經由燃料元件 ' 箱來設定。由於外殻內部中的高溫，因此提供一種金屬材 - 料作爲噴嘴用的材料。爲了防止感應式繞組上的感應式耦 合現象，須設有至少二個噴嘴，其在外殻之周圍方向中觀 看時在電性上相隔開。亦可使用耐熱之非金屬材料，例如， 陶瓷或燒結金屬。使用這些材料時不會發生感應性耦合現 •象。噴嘴配置在外殻內部中時所具有的優點是：其出口配 置在很靠近燃料元件箱之外表面處且因此可使該外表面有 效地冷卻。流入外殻中的鈍氣須自然地又離開外殻。因此， 外殻壁中可設有出口。但這會造成一種對該燃料元件箱之 周圍不均勻的流動特性且因此會造成不均勻的冷卻速率。 在一種較佳形式的設計方式中，外殻具有二個位於外側的 開口，其在使用情況下由燃料元件箱所抓握著，其中各開 口具有一種對該燃料元件箱之外形成互補之形式和一種小 -10- 1299874 的寬度’其大於燃料元件箱之扳手寬度。以此種方式可在 外殼和燃料元件箱之間調-整出一種或大或小的徑向間隙， 由此間隙使鈍氣向外流出。亦可藉由徑向間隙之不同的大 小來進行控制··較大的鈍氣量在該外殼的哪一個末端流出。 本發明以下將依據附圖所示之實施例來說明。 【實施方式】 第1圖中顯示燃料元件箱1之熱處理用的裝置，其包括·· 一垂直-或在箱子縱向3中在一支座（未顯示）上延伸的外殻 B 2; —加熱區4,其具有第一加熱裝置4a和第二加熱裝置4b; 以及一噴嘴配置6，其形成第一冷卻區7。外殼2圍繞一由 玻璃（β卩，一可透過電磁場之材料）所構成的圓柱8，此外， 外殼2包括一上凸緣9和一下凸緣10,其中此二個凸緣9, 10以圓板形方式形成且經由棒12(其以共軸方式配置在圓 柱8外部）而互相連接。凸緣9，1 0分別具有一中央開口 1 3 或14。開口 1 3，1 4具有一種與燃料元件箱1之外形互補之 形式且在熱處理時由燃料元件箱1在釋收一種徑向間隙1 5 胃或1 6之情況下所抓握。第二冷卻區1 7位於第一冷卻區7 下方，第二冷卻區1 7由水冷卻之冷卻體1 8所形成。冷卻體 18是一種雙壁式之中空圓柱，其內壁19環繞著中央開口 20，其小的寬度稍微大於燃料元件箱1之扳手寬度，因此 在熱處理期間在上述各部份之間會空空地形成一種徑向間 隙22。在內壁19和外壁24之間包含一種中空區23。中空 區23之下部區段在徑向中擴大。在此區域中以較厚的方式 形成該冷卻體18之外壁24且在直徑方向的對方位置上承 -11- 1299874 載一種入口支件2 5和出口支件2 6。出口支件2 6經由導線 27而與中空區23之上端相連接。 噴嘴配置6總共包含6個噴嘴28。每二個噴嘴28配置在 外殼2之徑向平面中且分別包含外殼2之內半周。噴嘴28 之具有向內之出口 31之各側形成一種大約90度的角度且在 使用時平行於燃料元件箱1之外表面而延伸。噴嘴28之外 側30對應於外殻之內面而以圓形方式彎曲。在二個配置在 徑向平面中的噴嘴28之間存在著一種中間區32,各噴嘴因 # 此在電性上互相隔開，使”感應性耦合至加熱區4a，4b之電 磁場”之現象不會發生。各噴嘴28經由導管33而被施加以 鈍氣（氬），各導管3 3在箱之縱向中在外殼2之內部中延伸。 、每一噴嘴28配置一特定的導管33及一配置在冷卻體18下 部中的終端支件34。導管33以其順流而下的末端注入至噴 嘴28中的中空區35中，中空區35是與出口 31相連接。 外殼2支撐在上凸緣9之上端且以其下端支撐冷卻體1 8 之徑向肩3 6上，冷卻體1 8由下凸緣1 0所承載著。就未存 Φ在一冷卻體18之本實施例而言，存在著一種凸緣（未顯示） 以取代該冷卻體18，外殻2在下側上支撐在該凸緣上且該 凸緣承載著一終端支件34。第一加熱裝置4a圍繞一種感應 式繞組37，由操作方向5中觀看時位於第一加熱裝置之後 之第二加熱裝置4b圍繞一感應式繞組3 8。各感應式繞組 37 ’ 38具有一種繞組載體39。在第一和第二繞組37，38 之間存在著一種凸緣40形式之電磁調整件，其以環形方式 圍繞者該外威且由金屬材料所構成。 -12- 1299874 爲了對燃料元件箱1進行熱處理，外殼2連同其上所固 定的部份在燃料元件箱1固定下在箱之縱向3中或處理方 向5中向上移動。外殼的速率大約是100至3 00毫米/分鐘， 較佳是200毫米/分鐘。/5相位區中的加熱是藉由二個加熱 裝置4a，4b或其感應式繞組37，38來達成，其中第一感應 式繞組37可使功率放大且供應至需要熱量之主要部份。感 應式繞組37設有一種純功率控制器。反之，第二加熱區4b 之較小之感應式繞組38是溫度控制回路之一部份，其用來 馨準確地調整該處理溫度至所期望之値。在燃料元件箱之區 段經由第二加熱區4b時，箱之區段只會受到較小的熱量。 離開第一加熱區之箱區段之溫度以無接觸的方式藉由二色 '高溫計（未顯示）來決定。須進行此種調整，使燃料元件箱之 經由加熱區4之縱向區段加熱至大約llOO^C之溫度。在一 燃料元件箱已離開第一加熱裝置4a之後，其首先到達一種 由加熱區4和冷卻區7之間的軸向距離所決定的區域中。 然後經由冷卻區7。在冷卻區7中燃料元件箱之存在於/3相 β位區中的縱向區段相對於以水來進行之浸冷而言會較慢地 冷卻至α相位區中，其中須調整經由噴嘴28所供應的鈍氣 流，使燃料箱區段在經由冷卻區7時至少以浸冷速率dT/dt > lOK/s來冷卻。此種冷卻藉由所供應之鈍氣流（其較佳是 在0.010和0.0 8Okg/s之間）之相對應的測量以及燃料元件箱 1和外殻2之間的相對速率之設計來調整，使燃料箱材料在 短時間內保持在大於630°C之溫度，以生長原來是以很微細 之形式沈積而成的二次相位。又，須進行冷卻之控制，使 -13- 1299874 顆粒較100微米還小。藉助於第二冷卻區17之冷卻體18 以去除餘熱。因此，一在下方離開外殼2之箱區段具有一 種較起動溫度（大約15(^0還小的溫度。在熱處理期間該使 燃料元件箱1之內面未氧化。鈍氣保持在燃料元件箱1之 內部空間中。 爲了在燃料元件箱1上導引該外殻，則上凸緣9之上側 上須設有導引滾輪43。爲了確保燃料元件箱1可在其整個 長度上經歴一種相同之熱處理。則在燃料元件箱1之上側 鲁和下側上須以可拆卸之方式設置一種箱區段44。爲了此一 目的’則須在箱區段44之內側上形成—^種連接板45，其經 由箱區段44之正側而突出。 - 【圖式簡單說明】 第1圖一裝置的縱向區段，其中爲了簡單之故只顯示一種圍 繞燃料元件箱之外殼，其具有固定於其上的構件。 圖係第1圖之外殻的下部。 第3圖係第1圖之外殼的上部。 _第4圖係沿著第1圖之線丨v v所形成的橫切面。 【主要元件符號說明】 1 燃料元件箱 2 外殻 3 箱之縱向 4 加熱區 4a? 4b 加熱裝置 5 操作方向 6 噴嘴配置 第一^冷卻區 -14- 1299874 9， 10 12 13， 14 15，16 17 18 19 20 ❿22 23 24 25 26 27 28 29Ϊ 299874 IX. Description of the Invention: [Technical Field] The present invention relates to a method and apparatus for heat treatment of a fuel element case composed of a chromium alloy. The fuel component tank forms the outer casing of the fuel element of the boiling water reactor. During the irradiation in the reactor, the fuel element box will change through the size of the crucible, for example, the length of the box will change, twist or expand. This change in size is related to the material organization, which is subject to adjustment in the surface process. In order to improve the dimensional stability associated with the structure when operating in the reactor, φ must be removed by heat treatment in the fuel element tank during the process to remove the original surface structure. The fuel element tank is thus continuously moved in the process via the heat treatment device and heated in the longitudinal section by means of an inductive heating zone gripped around it in the /3 phase zone, and a heated longitudinal section is After leaving the heating zone, it is cooled to a temperature in the alpha phase zone in a cooling zone. As a result, irregular distribution of crystallographic grains is caused by the removal of typical structures in the surface material. Most of the heating is achieved by means of inductive windings, and cooling is achieved with water or blunt gas. [Prior Art] Most of the heating in the prior art is achieved by means of inductive windings, and cooling is achieved by water or blunt gas. SUMMARY OF THE INVENTION It is an object of the present invention to provide another method for heat treating a fuel element case composed of a zirconium alloy and providing a device suitable for the method which can be used for heating the fuel element case when performing the method. Cooling provides a greater degree of variability. The above method is achieved by the first item of the patent application scope, and the 1299874 is the patent application scope item 14. Patent Application No. 1 is a method of designing, wherein heat treatment is achieved by means of - g two heating devices spaced apart from each other in the longitudinal direction of the box and independently operating (each having at least one inductive winding) A tank section entering the heating zone is heated by a first heating device and then heat treated by a second heating device that is lower in power than the first heating device. The advantage of two-stage heating is that the desired nominal temperature can be correctly adjusted and a greater variability can be achieved in terms of heat treatment φ when compared to heat treatment with only one type of winding. Preferably, the heating is performed by power adjustment in the first stage until near the rated temperature in the /3 phase zone. A second inductive winding of a smaller size is used to continue heating to a nominal temperature > degree. Due to the lower power of the second winding, the inductive heat generated by it can be more accurately controlled so that the rated temperature can be adjusted to the correct regenerative enthalpy. Due to the geometry of the fuel element box, a large inductive coupling is caused in the corner region, with the result that the angular coupling region is heated to a greater extent than in the Φ wall region. If such an unheated fuel element tank is cooled in the alpha phase zone, there is a risk that different material parameters will be formed in the corner region and in the wall region. The above-mentioned danger can be prevented by the two-stage heating of the present invention. Due to the much smaller induction in the second heating device, the greater heating effect of the corner region is less and therefore only detectable in a much smaller range. Another preferred mode of heat treatment is that the cooling of the tank section exiting the first heating element is delayed by the control of the second heating element, at which time a smaller 1299874 heat is transferred to the section. Using this method, the residence time of a tank section can be extended to 63 (in the temperature range above ^0) to achieve a proper particle growth and to expand the secondary deposit. This controlled cooling is now only when water is used. It is only possible to cool with a blunt gas. In combination with a two-stage heat treatment, a variety of different possible ways can be used to control the loading of heat on the one hand and to control the heat removal on the other hand. The fine intermediate metal phase and or secondary phase (which is formed during rapid cooling) is generally inadequate. When the fuel element box stays in the quasi-boiling water φ reactor for a long period of time, it is at a high fuel consumption. In this case, the intermediate metal phase is unfavorable because it causes very uniform corrosion. - From the technical point of view, the method should be optimized, and the first heating device The power is adjusted and the second heating device is adjusted in temperature, wherein a contactless measurement of the temperature of the tank is required, in particular by means of a two-color or quotient (Quotie) Nt) pyrometer to perform. The combination of two-stage inductive heat treatment is characterized by the blunt gas cooling method: the surface of the fuel element box does not grow or can not be covered with an oxide layer, and the oxide layer is heat treated. It must then be removed in an expensive manner. In this case it is advantageous to maintain a blunt air cushion during the heat treatment, which extends in the longitudinal direction of the tank via the heating zone and the cooling zone. In a particularly advantageous method, blunt The air cushion is held in a housing that moves relative to the fuel element housing and is gripped around the fuel element housing. The axial length of the blunt air cushion is thus equal to the length of the housing. The relative velocity between the fuel element housing and the heating or cooling zone The length of the blunt air cushion and the amount of blunt air supplied to the cooler are therefore adjusted to each other so that the box area leaving the blunt air cushion has a temperature lower than the growth temperature of the respective box material. The entire fuel component box can also be made. Arranged in a chamber in which a blunt air cushion extending over the entire length of the fuel element housing is maintained. Individually controlling the cooling of the fuel element housing Another possible way is to cool in the cooling zone by means of a cooling body which is cooled by a fluid (for example, water) around the fuel element tank in addition to the blunt gas cooling. In order to prevent the fuel element box from being inside the heat treatment. In the oxidation of the face, a fuel atmosphere is maintained in the fuel element tank #. In another preferred method, the fuel element tank is held stationary during the heat treatment and the heating zone and the cooling zone are moved in the longitudinal direction of the tank. In this way, the construction height of the device can be lowered. One device for achieving the above object comprises a heating zone having at least one first heating device and at least one second heating device, which is located first in the operating direction. After the heating device, each of the heating devices has at least one inductive winding 'catched around the fuel element box' and wherein the first heating device has a greater power than the second heating device. Further, the device includes a cooling zone for forming a cooling device disposed at an axial distance from the heating zone and including at least one nozzle, whereby the nozzle can be blunt Flow to the fuel element is introduced to the surface of the entire range of the tank. The outer casing forms a carrier for carrying at least one inductive winding and at least one obturator nozzle and forms an outer boundary for the fuel component tank (which includes a blunt air cushion). The pure air cushion is formed by the blunt gas flowing out of the nozzle. Preferably, at least one inductive coil is disposed in the outer periphery of the outer casing. Further, the casing 1299874 is constructed of an electromagnetically permeable material in at least a region surrounded by the inductive winding. For space reasons, inductive windings are advantageously placed on the outer circumference of the housing. In addition, the thermal effects caused by the high temperatures in the interior of the enclosure can be reduced. As mentioned above, two-stage heating is advantageous in terms of adjusting the technical point of view. The inductive windings formed in order to achieve this are separated by a shield disposed therebetween, in particular by a flange of electrically conductive material that is gripped around the exterior of the outer casing. • The nozzle for cooling has multiple outlets that align with the outside of the fuel element box. Therefore, the fuel element case can be uniformly cooled in the surrounding direction. An annular nozzle can also be provided which can be set via the fuel element 'box in use. Due to the high temperature in the interior of the casing, a metal material is provided as a material for the nozzle. In order to prevent inductive coupling on the inductive winding, at least two nozzles are provided which are electrically spaced apart when viewed in the direction around the outer casing. Heat resistant non-metallic materials such as ceramic or sintered metal can also be used. Inductive coupling does not occur when using these materials. The nozzle is arranged in the interior of the housing with the advantage that its outlet is disposed very close to the outer surface of the fuel element housing and thus allows the outer surface to be effectively cooled. The blunt gas that flows into the outer casing naturally leaves the outer casing again. Therefore, an outlet can be provided in the wall of the casing. However, this causes a non-uniform flow characteristic around the fuel element tank and thus causes an uneven cooling rate. In a preferred form of design, the outer casing has two outer openings that are gripped by the fuel element housing in use, wherein each opening has a complementary form to the outer of the fuel element housing And a small -10- 1299874 width 'is greater than the span of the fuel element box. In this way, a large or small radial gap can be adjusted between the outer casing and the fuel element tank, whereby the gap causes the blunt gas to flow outward. It is also possible to control by the difference in the radial gap. • The larger amount of blunt gas flows out at which end of the casing. The invention will now be described in accordance with the embodiments shown in the drawings. [Embodiment] FIG. 1 shows a device for heat treatment of a fuel element case 1, which includes a vertical-or outer casing B 2 extending in a seat (not shown) in a longitudinal direction 3 of the case; Zone 4 having a first heating device 4a and a second heating device 4b; and a nozzle arrangement 6 forming a first cooling zone 7. The outer casing 2 surrounds a cylinder 8 composed of glass (β卩, a material permeable to electromagnetic fields). Further, the outer casing 2 includes an upper flange 9 and a lower flange 10, wherein the two flanges 9, 10 are rounded The plate shape is formed and connected to each other via the rods 12 which are disposed coaxially outside the cylinder 8. The flanges 9, 10 each have a central opening 1 3 or 14. The opening 1 3, 14 has a form complementary to the outer shape of the fuel element case 1 and is gripped by the fuel element case 1 upon release of a radial gap 1 5 stomach or 16 during heat treatment. The second cooling zone 17 is located below the first cooling zone 7, and the second cooling zone 17 is formed by a water-cooled cooling body 18. The cooling body 18 is a double-walled hollow cylinder, the inner wall 19 of which surrounds the central opening 20, the small width of which is slightly larger than the span width of the fuel element tank 1, so that it is vacant between the above parts during the heat treatment. A radial gap 22 is formed. A hollow zone 23 is included between the inner wall 19 and the outer wall 24. The lower section of the hollow zone 23 is enlarged in the radial direction. In this region, the outer wall 24 of the heat sink 18 is formed in a thicker manner and at the opposite position in the diametrical direction -11 - 1299874 carries an inlet support 25 and an outlet support 26. The outlet support 26 is connected to the upper end of the hollow zone 23 via a wire 27. The nozzle arrangement 6 contains a total of six nozzles 28. Each of the two nozzles 28 is disposed in a radial plane of the outer casing 2 and includes an inner circumference of the outer casing 2, respectively. Each side of the nozzle 28 having the inward outlet 31 forms an angle of about 90 degrees and extends parallel to the outer surface of the fuel element tank 1 in use. The outer side 30 of the nozzle 28 is curved in a circular manner corresponding to the inner face of the outer casing. There is an intermediate zone 32 between the two nozzles 28 arranged in the radial plane, the nozzles being electrically separated from one another to cause "inductive coupling to the electromagnetic fields of the heating zones 4a, 4b" will not happen. Each of the nozzles 28 is applied with a gas (argon) via a conduit 33, and each of the conduits 3 3 extends in the interior of the outer casing 2 in the longitudinal direction of the tank. Each nozzle 28 is provided with a specific conduit 33 and a terminal support 34 disposed in the lower portion of the heat sink 18. The conduit 33 is injected with its downstream end into the hollow region 35 in the nozzle 28 which is connected to the outlet 31. The outer casing 2 is supported on the upper end of the upper flange 9 and supports the radial shoulder 36 of the heat sink 18 with its lower end, and the heat sink 18 is carried by the lower flange 10. In the case of the present embodiment in which a heat sink 18 is not present, there is a flange (not shown) in place of the heat sink 18 on which the outer casing 2 is supported on the lower side and which carries A terminal support 34. The first heating means 4a surrounds an inductive winding 37 which surrounds an inductive winding 38 by a second heating means 4b located behind the first heating means when viewed in the operating direction 5. Each inductive winding 37' 38 has a winding carrier 39. Between the first and second windings 37, 38 there is an electromagnetic adjustment member in the form of a flange 40 which surrounds the outer ring and is constructed of a metallic material. -12- 1299874 In order to heat-treat the fuel element tank 1, the outer casing 2, together with the portion fixed thereon, is moved upward in the longitudinal direction 3 of the tank or in the treatment direction 5 under the fixation of the fuel element tank 1. The rate of the outer casing is about 100 to 300 mm/min, preferably 200 mm/min. Heating in the /5 phase region is achieved by two heating devices 4a, 4b or their inductive windings 37, 38, wherein the first inductive winding 37 amplifies the power and supplies it to a major portion of the required heat. The inductive winding 37 is provided with a pure power controller. Conversely, the smaller inductive winding 38 of the second heating zone 4b is part of a temperature control loop that is used to accurately adjust the processing temperature to the desired temperature. When the section of the fuel element tank passes through the second heating zone 4b, the section of the tank receives only a small amount of heat. The temperature of the tank section leaving the first heating zone is determined in a contactless manner by a two-color pyrometer (not shown). This adjustment is required to heat the fuel element tank through the longitudinal section of the heating zone 4 to a temperature of about llOO^C. After a fuel component tank has left the first heating device 4a, it first reaches an area determined by the axial distance between the heating zone 4 and the cooling zone 7. It is then passed through the cooling zone 7. The longitudinal section of the fuel element tank present in the /3 phase beta zone in the cooling zone 7 will be cooled more slowly into the alpha phase zone relative to the immersion cooling with water, wherein adjustment via nozzle 28 is required. The supplied blunt gas stream causes the fuel tank section to be cooled at least by the immersion rate dT/dt > lOK/s when passing through the cooling zone 7. Such cooling is adjusted by the corresponding measurement of the supplied blunt gas flow (which is preferably between 0.010 and 0.08 kg/s) and the relative rate between the fuel element tank 1 and the outer casing 2, The fuel tank material is maintained at a temperature greater than 630 ° C for a short period of time to grow a secondary phase that was originally deposited in a very fine form. Also, cooling control is required to make the -13-1299874 particles smaller than 100 microns. The heat sink 18 is removed by means of the second cooling zone 17 to remove residual heat. Therefore, a tank section that exits the outer casing 2 below has a temperature that is lower than the starting temperature (a temperature of about 15 (0). This causes the inner surface of the fuel element tank 1 to be unoxidized during the heat treatment. The inert gas is held in the fuel element tank. In order to guide the outer casing on the fuel element tank 1, a guide roller 43 is provided on the upper side of the upper flange 9. In order to ensure that the fuel element tank 1 can pass through the same length over its entire length In the heat treatment, a box section 44 is detachably provided on the upper side and the lower side of the fuel element tank 1. For this purpose, a type of connecting plate is formed on the inner side of the box section 44. 45, which protrudes through the positive side of the box section 44. - [Simplified illustration of the drawings] Figure 1 shows a longitudinal section of the apparatus, wherein for simplicity only one housing surrounding the fuel element housing is shown, which has a The upper part of the outer casing is shown in Fig. 1. Fig. 3 is the upper part of the outer casing of Fig. 1. _ Fig. 4 is a cross section formed by 丨vv along the line of Fig. 1. Component symbol description] 1 fuel component box 2 housing 3 box 4a? 4b heating means 5 arranged a first operation direction of the nozzle 6 ^ -14-12998749 cooling zone to the heating zone 4, 10 12 13, 14 15,16 17 18 19 20 ❿22 23 24 25 26 27 28 29
31 32 33 34 35 36 37，38 圓柱 凸緣 棒 開口 徑向間隙 第二冷卻區 冷卻體 內壁 開口 徑向間隙 中空區 外壁 入口支件 出口支件 導管 噴嘴 內側 外側 出口 中介區 導管 終端支件 中空區 徑向肩 感應式繞組 繞組載體 -15 39 1299874 40 凸 緣 42 軸 向 間 距 43 導 引 滾 輪 44 箱 區 段 45 連 接 板31 32 33 34 35 36 37,38 Cylindrical flange rod opening radial clearance second cooling zone cooling inner wall opening radial clearance hollow area outer wall inlet support outlet support conduit nozzle inner side outer outlet intermediate zone conduit terminal support hollow zone Radial shoulder inductive winding winding carrier - 15 39 1299874 40 Flange 42 Axial spacing 43 Guide roller 44 Box section 45 Connecting plate
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