200925288 六、發明說明： 【發明所屬之技術領域】 本广月係關於一種可有致率地利用 (radiant tube burner^ ^ s I、麂機 之用以使加熱區環境氣體升、、田之 加熱手段的廢氣之金屬條連續熱處理設備 升 【先前技術】 有。 於加熱區之前方’為達成節約能源化，有 往，預熱區之環境氣_ 圖（參照專利文獻1)。以 為使預熱區a與加熱w連通I4之各種方式形成。圖2 為非氧化環境氣體者。圖3為將預熱之環境氣體作 氣體以密封部c隔絕 ”'、、“、、區3與加熱區b之環境 一方面，將預熱區a b作為非氧化環境氣體，另 為將預熱區a與加敎之環^乳體作為空氣（外氣）者。圖4 熱區b作為非氧心=之環境氣體以密封部C隔絕，將加 氣體作為用以使加I:體:另一方面，將加熱區a之環境 之排氣者。輻射管;機^境氣體升溫的輻射管燃燒機d 為對預熱區a,，之排氣為晴以上之高溫。 熱區b之非氧^减體加溫，於圖2的方式中，係將加 a之非氧入預熱區&將該導入到預熱區 中進行熱交換、讀燒機d之職於熱交換器e 加熱。於圖3的 ㈣空氣與輕射管_ '中’系將導人到預熱區 97議 ‘’、、4d之排氣於熱交換器f進行熱交換 5 200925288 而加熱。於圖4的方式中，係以輻射管燃燒機d之排氣直接 作為預熱區a之環境氣體。於任一方式中，為調整預熱區a 之内壓均自設置有壓力調整閥g之排氣系統h排出預熱區a 内之環境氣體。 (專利文獻1)日本專利特開平10-102151號公報 【發明内容】 (發明所欲解決之問題） ❹ 當就利用來自輻射管燃燒機d等之用以使加熱區b之環境 氣體升溫之加熱手段的廢熱方面而言，於圖2~圖4所示之 各方式中，有以下述課題，而無法充分地利用廢熱。 於圖2的方式中，與加熱區b連通之預熱區a的非氧化環 境氣體係藉由輻射管燃燒機d升溫至相當高溫度。即使將如 此高溫的非氧化環境氣體於熱交換器e中與輻射管燃燒機d 之排氣進行熱交換，熱交換效率亦較低，幾乎無法利用廢熱 ® 而自熱交換器e排出極高溫的排氣。 於圖3的方式中，預熱區a之内部環境氣體為作為氧化環 境氣體之空氣。於空氣環境氣體中將金屬條i預熱至高溫並 不佳。因而，即使將空氣在熱交換器f與輻射管燃燒機d • 之排氣進行熱交換，亦無法充分利用廢熱，與圖1的方式同 -樣地會自熱交換器f排出極高溫的排氣。 於圖4的方式中，由於自輻射管燃燒機d送入之排氣會使 預熱區内壓力上昇，故將排氣自排氣系統h排出。此時，排 97135981 6 200925288 出之排乳依然為相當而溫狀態，故無法有效率地利用韓射管 燃燒機d之廢熱。 本發明有鑑於上述習知課題而提案，其目的在於提供一種 可有效率地利用來自輻射管燃燒機等之用以使加熱區環境 氣體升溫之加熱手段的廢熱之金屬條連續熱處理設備。 (解決問題之手段） 本發明之金屬條連續熱處理設備，其特徵在於，於自空氣 ❿導入系統導入之空氣環境氣體中，對連續送入之金屬條進行 預熱之預熱區；對自上述預熱區侧連續送入之金屬條在非氧 化環境氣體中進行加熱之加熱區；用以使該加熱區之非氧化 環境氣體升溫之加熱手段；於上述預熱區與上述加熱區間， 從該預熱區之空氣環境氣體隔絕且與該加熱區連通設置，於 非氧化環境氣體中對金屬條以較預熱區溫度高的溫度進行 ❹預熱之第2職區；自上述加熱手段排出廢熱之廢熱排出系 統；設置於該廢熱排出系統’以流通之廢熱對上述第2預熱 區之非氧化環境氣體進行加熱之高溫側熱交換部；及於上述 廢熱排出系統，設置於上述高溫侧熱交換部下游處，以流通 之廢熱對導入至上述預熱區之空氣進行加熱之低溫侧熱交 換部。 上述排氣系統具備有藉由來自上述預熱區之排氣對製程 媒體加熱之製程用熱交換部。 (發明效果） 97135981 7 200925288 於本發明之金屬條連續熱處理設備中，可有效率地利用來 自輻射管燃燒機等之用以使加熱區環境氣體升溫之加熱手 段的廢熱。 【實施方式】 參 ❹ 以下就本發明金屬條連續熱處理設備之較佳一實施形態 參照附圖詳細地做㈣。本實施雜之金屬條連賴處理設 備1 ’基本上如圖1所示’係具備有如下而構成··於自空氣 導入系統2導入之空氣環境氣體中’對連續送入之金屬條3 進行預熱之預熱區4;對自預熱區4側連續送人之金屬條3 ^非氧化環境氣體中進行加熱之加熱區7;作為用以使加熱 區7之非氧化環境乳體升溫之加熱手段的輻射管燃燒機8 ; 於預熱區4與加熱區7之間，隔絕自預熱區4之空氣環境氣 體且’、加熱區7連収置，於非氧化環境氣體中對金屬條3 在較預熱溫度高的溫度進行職之第2預魅9;自輻射管 燒機8排出廢熱之廢熱排出系統1〇 ;設置於廢熱排出系 統1〇，以流通之廢熱對第2預熱區9之非氧化環境氣體進 仃加熱之高溫侧熱交換部u ;與於廢熱排出系統ι〇中，設 2高溫側熱交換部11下游處，以流通之廢熱對導入至預 …品4之工氣進仃加熱之低溫側熱交換部I〗。於排氣系統5 中，具備有以來自預熱區4之排氣對製程媒體進行加熱之製 程用熱交換4 13。更具備有肋自賴區4排氣之排氣系 統5、與設置於排氣系統5之用以調整預熱區内壓力的壓力 97135981 8 200925288 調整機構一例之壓力調整閥6。 本實施形態之金屬條連續熱處理設備1，主要具備有以下 所構成：設置於前段，對連續供給的金屬條3進行預熱之預 熱區4;設置於預熱區4之次段，對在預熱區4被預熱之金 屬條3於更高溫度進行預熱之第2預熱區9 ;設置於第2預 熱區9之次段，對在第2預熱區9被預熱之金屬條3進行加 熱處理之加熱區7。 ❹ 於預熱區4設置有金屬條3之裝入部4a及送出部4b。於 第2預熱區9設置有自預熱區4送入的金屬條3之導入部 9a。於該等預熱區4與第2預熱區9之間，設置有藉由分別 設置於其等之送出部4b及導入部9a之未圖示密封機構將該 等預熱區4與第2預熱區9之内部環境氣體相互隔絕而成獨 '立構造之密封部14。於第2預熱區9與加熱區7之間，設 置有將該等連通，用以將金屬條3自第2預熱區9送入加熱 ® 區7之窄通路部15。於預熱區4、第2預熱區9及加熱區7 之内部分別適當地配設用以導引金屬條3之搬送的輥16。 連續供給之金屬條3係自裝入部4a送入至預熱區4中。 送入至預熱區4之金屬條3,自送出部4b透過密封部14送 往導入部9a，再送往第2預熱區9。送入至第2預熱區9 之金屬條3，更經由窄通路部15送往加熱區7。 於預熱區4連接有具備空氣扇2a之空氣導入系統2。於 預熱區4内部，透過空氣導入系統2，導入由空氣扇2a吸 97135981 9 200925288 =空氣(:氣)，藉此可形成作為氡化環 乳體X，於預熱區4連接⑽將内部之U 農境 部，m系統5。於排氣系統5中設置用心趙往外 内塗力之壓力調整閥6。壓力調整闊6，係如止^預熱區 熱區内壓力㈣縣狀的 1 ’於預 排氣系統5排氣。 開將，境氣發往 另-方面’加熱區7與第2預熱區9經 相連通’加熱區7之内部環境氣體可往第2預部15互 於該等加熱區7内部及第2預熱區9内部封人^，通。 氮氣之混合氣體，形成非氧化環境氣體。 乳氣與 於第2預熱區9連接具備有猶環風扇17a之循環系 循環系統17藉由循環風扇17a自第2預熱區9吸弓！非° 環境氣體’使吸引的非氧化環境氣體往第2預熱區9回流。 ❹ 於加熱區7 ’為使内部之非氧化環境氣體升溫而設置輕 射官燃燒機8。輻射管燃燒機8以鼓風機8a所供給的燃燒 空氣使燃料燃燒而發熱，使非氧化環境氣體升溫。加熱區7 之非氧化環境氣體，藉由輻射管燃燒機8之加熱而升溫至 700〜950 C之程度。於輻射管燃燒機8連接由此排出含有廢 熱的排氣之廢熱排出系統1〇。 於排氣流通之廢熱排出系統10中途設置有高溫侧熱交換 部11，同時於高溫侧熱交換部U下游側設置有低溫側熱交 換部12。咼溫側熱交換部11與循環系統η連接，以轄射 97135981 10 200925288 管燃燒機8之高溫廢熱對第2預熱區9之非氧化環境氣體進 行加熱。第2預熱區9之非氧化環境氣體’經自加熱區7 之熱流入與高溫側熱交換部11之加熱，而維持於例如400 。(：以上，尤以450〜500°C為佳。又，低溫側熱交換部12與 空氣導入系統2連接’藉由經高溫侧熱交換部11之熱交換 而降溫的低溫廢熱對往預熱區4導入之空氣進行加熱。藉由 低溫側熱交換部12之導入空氣加熱使預熱區4之空氣環境 © 氣體溫度升溫至200〜250°C。 雖未圖示，預熱區4及第2預熱區9之環境氣體溫度，視 需要亦可依據設置於該等之溫度感應器所檢測到的溫度訊 號，由控制器來控制輻射管燃燒機8、空氣扇2a、循環風扇 17a、更至未圖示之設備内RC風扇，藉此進行控制。 又，於連接至預熱區4之排氣系統5，為了對其他製程所 使用之液體或氣體等製程媒體以自預熱區4之排氣進行加 熱，亦有設置製程用熱交換部13之情況。由於自預熱區4 之排氣為熱風，故亦可不經製程用熱交換部13而直接利用 於其他製程。 其次’就本實施形態金屬條連續熱處理設備1之作用加以 說明。於以本熱處理設備1對金屬條3進行熱處理時’首先 係使加熱區7、第2預熱區9及預熱區4之内部環境氣體升 溫。 使加熱區7之輻射管燃燒機8發熱以使封入於加熱區7 97135981 200925288 内部之非氧化環境氣體升溫。加熱區7之内部環境氣體亦透 過窄通路部15流入至第2預熱區9。包含輻射管燃燒機8 運轉所產生的廢熱之排氣流通至廢氣排出系統10。於第2 預熱區9，藉由循環風扇17a之運轉，第2預熱區9之内部 環境氣體會在循環系統17循環。流通廢氣排出系統10之排 氣中高溫廢熱，藉由在高溫侧熱交換部11之熱交換而對流 通循環系統17的第2預熱區9之内部環境氣體加熱以維持 ⑩ 第2預熱區9之内部環境氣體溫度。藉此，輻射管燃燒機8 之廢熱可利用於第2預熱區9之非氧化環境氣體之加熱，使 排氣溫度降溫。 另一方面，於預熱區4，透過空氣風扇2a之運轉而自空 氣導入系統2導入空氣，形成空氣環境氣體。包含有流通廢 熱排出系統10之廢熱的排氣，在從高溫側熱交換部11流出 後，流入至低溫侧熱交換部12。排氣中之低溫廢熱，經低 ® 溫側熱交換部12之熱交換對流通空氣導入系統2而導入至 預熱區4之空氣進行加熱。藉此，輻射管燃燒機8之廢熱更 進一步利用於預熱區4之空氣環境氣體之加熱，排氣溫度更 進一步被降溫。包含低溫廢熱之排氣之後從廢熱排出系統 10從外部排出。在預熱區4中，當預熱區内壓力超過預設 - 壓力後，利用壓力調整閥6將空氣環境氣體往排氣系統5 排出。藉此調整預熱區内壓力。 如此一來，當預熱區4、第2預熱區9及加熱區7之内部 97135981 12 200925288 環境氣體溫度升溫後，金屬條3從預熱區4之襞入部仂送 入而經預熱區4預熱’其次，送人至第2預熱區9以更高溫 度預熱，之後，從加熱區7送入進行加熱處理。 另一方面，流通經連接至預熱區4的排氣系統5之排氣， 、流入到製程熱交換部13,藉此對其他製程中所用之製程媒 體加熱，藉由該加熱而成低溫排氣至外部。 於上述說明之本實施形態之金屬條連續熱處理設備i β中，在預熱區4與加熱區7之間，具備有以較預熱區4更高 溫度對金屬條3進行預熱之第2預熱區9，同時於含有輻射 管燃燒機8廢熱的排氣之廢熱排出系統10,在與第2預熱 區9的循環系統17連接之高溫侧熱交換部η及高溫側熱交 換部11的下游側設置有與預熱區4之空氣導入系統2連接 的低溫侧熱交換部12，故可對用以使加熱區7之環境氣體 升溫的輻射管燃燒機8之廢氣進行2階段回收而有效率地利 ❹用於金屬條3之預熱，可促進節約能源化。又，可降低輻射 管燃燒機8之排氣的排出溫度，可使廢氣排出系統1〇之出 口側構造簡單化。 於廢熱排出系統10，沿著排氣之流動方向，依序配設高 溫側熱交換部11與低溫側熱交換部12，於高溫側熱交換部 11藉由高溫廢熱對第2預熱區9之高溫環境氣體加熱，於 低溫側熱交換部12藉由溫度降低之低溫廢熱對較低溫即可 的預熱區4之空氣環境氣體加熱，故可配合該等預熱區4 97135981 13 200925288 及第2預熱區9之溫度條件，合理地利用輻射管燃燒機8 之廢熱。 又’由於自空现導入系統2導入空氣而形成預熱區4之内 部環境氣體’故可確保大量自預熱區4的排氣量，該排氣熱 亦可有效利用。於本實施形態中，由於在排氣系統5設置有 壓力調整閥6’故可確保該排氣量並適當調整預熱區内壓 力。更進一步’由於在排氣系統5設置有製程熱交換部13， β故由自排氣系統5排出之排氣對其他製程媒體有效率地加 熱，亦可有效利用自預熱區4之排氣熱。 上述實施形態中’作為壓力調整機構，係以設置於排氣系 統5之壓力調整閥6為例說明，惟並非限定於此，亦可用起 泡器（bubbler)等之壓力釋放手段。 【圖式簡單說明】 圖1為表不本發明之金屬條連續熱處理設備之較佳一實 ® 施形態之概略構成圖。 圖2為表*習知金屬條連續熱處理設備_例之概略圖。 圖3為表示習知金屬條連續熱處理設備其他例之概略圖。 圖4為表tf習知金屬條&續熱處理設備更其他例之概略 圖。 【主要元件符號說明】 1 金屬條連續熱處理㈣ 2 空氣導入系统 97135981 200925288200925288 VI. Description of the invention: [Technical field to which the invention belongs] This Guangyue system is concerned with a radiant tube burner^^s I, a machine for heating the ambient gas in the heating zone, and heating means for the field. Continuous heat treatment equipment for exhaust metal strips [Prior Art] Yes. Before the heating zone, in order to achieve energy saving, there is a pre-heating zone ambient gas _ Figure (refer to Patent Document 1). a is formed in various ways of connecting I4 with heating w. Fig. 2 is a non-oxidizing atmosphere gas. Fig. 3 is a gas for preheating the ambient gas as a gas to seal "c", ",", zone 3 and heating zone b On the one hand, the preheating zone ab is used as the non-oxidizing atmosphere gas, and the preheating zone a and the twisted ring emulsion are used as the air (outside gas). Figure 4 The hot zone b is used as the non-oxygen heart = environment The gas is insulated by the sealing portion C, and the gas is added as a ventilator for the environment of the heating zone a. On the other hand, the radiant tube of the environment of the heating zone a is irradiated; In the preheating zone a, the exhaust gas is above the high temperature of the sunny zone. The non-oxygen reduction body is heated. In the mode of Fig. 2, the non-oxygen is added to the preheating zone & the heat is exchanged into the preheating zone, and the heat exchanger is replaced by the heat exchanger. e Heating. In Figure 4, (4) Air and light pipe _ '中中" will lead to the preheating zone 97, '', 4d exhaust gas is exchanged in heat exchanger f for heat exchange 5 200925288. In the mode of 4, the exhaust gas of the radiant tube burner d is directly used as the ambient gas of the preheating zone a. In either mode, the row of the pressure regulating valve g is provided for adjusting the internal pressure of the preheating zone a. The gas system h is discharged from the ambient gas in the preheating zone a. (Patent Document 1) Japanese Patent Laid-Open No. Hei 10-102151 (Draft of the Invention) (Problems to be Solved by the Invention) ❹ When using a radiant tube burner d or the like In the aspect of the waste heat of the heating means for raising the ambient gas in the heating zone b, in each of the modes shown in Figs. 2 to 4, the following problems are not caused, and the waste heat cannot be sufficiently utilized. The non-oxidizing ambient gas system of the preheating zone a in communication with the heating zone b is heated by the radiant tube burner d to a comparable High temperature. Even if such a high-temperature non-oxidizing ambient gas is exchanged with the exhaust gas of the radiant tube burner d in the heat exchanger e, the heat exchange efficiency is low, and it is almost impossible to use the waste heat® to be discharged from the heat exchanger e. Extremely high temperature exhaust. In the mode of Fig. 3, the internal ambient gas of the preheating zone a is air which is an oxidizing ambient gas. It is not preferable to preheat the metal strip i to a high temperature in the air ambient gas. The air exchanges heat between the heat exchanger f and the exhaust of the radiant tube burner d, and the waste heat cannot be fully utilized. Similarly to the method of Fig. 1, the exhaust gas of the extremely high temperature is discharged from the heat exchanger f. In the method of 4, since the exhaust gas sent from the radiant tube burner d causes the pressure in the preheating zone to rise, the exhaust gas is discharged from the exhaust system h. At this time, the milk discharged from the line 97135981 6 200925288 is still quite warm, so the waste heat of the Korean tube burner d cannot be utilized efficiently. The present invention has been made in view of the above-described conventional problems, and an object of the invention is to provide a continuous heat treatment apparatus for metal strips which can efficiently utilize waste heat from a radiant tube burner or the like for heating a heating zone ambient gas. (Means for Solving the Problem) The metal strip continuous heat treatment apparatus of the present invention is characterized in that a preheating zone for preheating the continuously fed metal strip is extracted from the air ambient gas introduced from the air crucible introduction system; a heating zone in which the metal strip continuously fed on the side of the preheating zone is heated in a non-oxidizing atmosphere; a heating means for heating the non-oxidizing ambient gas in the heating zone; in the preheating zone and the heating zone, The air ambient gas in the preheating zone is isolated and connected to the heating zone, and the second metal zone is preheated in the non-oxidizing ambient gas at a temperature higher than the temperature of the preheating zone; the waste heat is discharged from the heating means a waste heat discharge system; a high temperature side heat exchange unit installed in the waste heat discharge system to heat the non-oxidizing ambient gas in the second preheating zone by circulating waste heat; and the waste heat discharge system disposed on the high temperature side heat A low temperature side heat exchange unit that heats the air introduced into the preheating zone downstream of the exchange unit by the waste heat of circulation. The exhaust system includes a process heat exchange unit for heating a process medium by exhaust gas from the preheating zone. (Effect of the Invention) 97135981 7 200925288 In the continuous heat treatment apparatus for metal strips of the present invention, waste heat from a heating means such as a radiant tube burner for heating the ambient gas in the heating zone can be efficiently utilized. [Embodiment] Reference is made hereinafter to a preferred embodiment of the continuous heat treatment apparatus for metal strips of the present invention (4) in detail with reference to the accompanying drawings. The metal strip processing apparatus 1' of the present embodiment basically has the following structure as shown in Fig. 1. In the air ambient gas introduced from the air introduction system 2, the continuous feeding of the metal strip 3 is performed. Preheating zone 4 for preheating; heating zone 7 for heating metal strips continuously supplied from the side of the preheating zone 4 to the non-oxidizing atmosphere; as a heating zone for heating the non-oxidizing environment of the heating zone 7 The radiant tube burner 8 of the heating means; between the preheating zone 4 and the heating zone 7, isolating the air ambient gas from the preheating zone 4 and ', the heating zone 7 is continuously received, and the metal strip is in the non-oxidizing atmosphere gas. 3 The second pre-enchantment 9 is carried out at a temperature higher than the preheating temperature; the waste heat discharge system for discharging waste heat from the radiant tube burner 8 is set; the waste heat discharge system 1 is set, and the waste heat is distributed to the second preheating The non-oxidizing ambient gas in the zone 9 is heated to the high-temperature side heat exchange unit u; and in the waste heat discharge system ι〇, the downstream side of the high-temperature side heat exchange unit 11 is provided, and the waste heat is distributed to the pre-product 4 The low temperature side heat exchange unit I of the work gas is heated. The exhaust system 5 is provided with a process heat exchange 4 13 for heating the process medium by the exhaust gas from the preheating zone 4. Further, the exhaust system 5 having the ribbed self-draining zone 4 and the pressure provided in the exhaust system 5 for adjusting the pressure in the preheating zone are provided. 97135981 8 200925288 The pressure regulating valve 6 of an example of the adjusting mechanism. The metal strip continuous heat treatment apparatus 1 of the present embodiment mainly includes a preheating zone 4 provided in the front stage for preheating the continuously supplied metal strip 3, and a second section disposed in the preheating zone 4, The preheating zone 4 is preheated by the preheated metal strip 3 at a higher temperature; the second preheating zone 9 is disposed in the second preheating zone 9 and is preheated in the second preheating zone 9. The metal strip 3 is subjected to a heat treatment zone 7 for heat treatment. The charging portion 4a of the metal strip 3 and the delivery portion 4b are provided in the preheating zone 4. The introduction portion 9a of the metal strip 3 fed from the preheating zone 4 is provided in the second preheating zone 9. Between the preheating zone 4 and the second preheating zone 9, the preheating zone 4 and the second zone are provided by a sealing mechanism (not shown) provided by the delivery part 4b and the introduction part 9a provided respectively. The internal environment gas of the preheating zone 9 is isolated from each other to form a sealing portion 14 of a unique structure. Between the second preheating zone 9 and the heating zone 7, there is provided such communication for feeding the metal strip 3 from the second preheating zone 9 to the narrow passage portion 15 of the heating zone 7. A roller 16 for guiding the conveyance of the metal strip 3 is appropriately disposed in the interior of the preheating zone 4, the second preheating zone 9, and the heating zone 7, respectively. The continuously supplied metal strip 3 is fed into the preheating zone 4 from the loading section 4a. The metal strip 3 fed to the preheating zone 4 is sent from the delivery portion 4b to the introduction portion 9a through the sealing portion 14, and then sent to the second preheating zone 9. The metal strip 3 fed to the second preheating zone 9 is further sent to the heating zone 7 via the narrow passage portion 15. An air introduction system 2 having an air fan 2a is connected to the preheating zone 4. Inside the preheating zone 4, through the air introduction system 2, the air fan 2a is introduced to suck 97135981 9 200925288 = air (: gas), whereby it can be formed as a deuterated ring emulsion X, and the preheating zone 4 is connected (10) to the inside. U Department of Agriculture, m system 5. A pressure regulating valve 6 for applying a force to the outside is provided in the exhaust system 5. The pressure adjustment is 6 wide, such as the preheating zone, the pressure in the hot zone (4), the county-like 1' exhaust in the pre-exhaust system 5. The heating zone 7 and the second preheating zone 9 are connected to each other. The internal environment gas of the heating zone 7 can be connected to the second pre-portion 15 to the inside of the heating zone 7 and the second The preheating zone 9 is internally sealed and passed. A mixed gas of nitrogen forms a non-oxidizing ambient gas. The milk gas is connected to the second preheating zone 9 and has a circulation system 17 having a juxtaposed fan 17a. The circulation system 17 sucks the bow from the second preheating zone 9 by the circulation fan 17a! The non-ambient ambient gas 'returns the attracted non-oxidizing ambient gas to the second preheating zone 9. The light-receiving burner 8 is provided in the heating zone 7' to heat the internal non-oxidizing ambient gas. The radiant tube burner 8 burns the fuel by the combustion air supplied from the blower 8a to generate heat, and raises the temperature of the non-oxidizing atmosphere. The non-oxidizing ambient gas in the heating zone 7 is heated to a temperature of 700 to 950 C by the heating of the radiant tube burner 8. The radiant tube burner 8 is connected to a waste heat discharge system 1 that discharges exhaust gas containing waste heat. The high-temperature side heat exchange unit 11 is provided in the middle of the exhaust heat exhaust system 10 through which the exhaust gas flows, and the low temperature side heat exchange unit 12 is provided on the downstream side of the high temperature side heat exchange unit U. The enthalpy temperature side heat exchange portion 11 is connected to the circulation system η to heat the non-oxidizing ambient gas of the second preheating zone 9 by arranging the high temperature waste heat of the pipe burner 8 of 97135981 10 200925288. The non-oxidizing ambient gas ' in the second preheating zone 9 is heated by the heat from the heating zone 7 and heated by the high temperature side heat exchange section 11, and is maintained at, for example, 400. (In the above, the low temperature side heat exchange unit 12 is connected to the air introduction system 2, and the low temperature waste heat which is cooled by the heat exchange by the high temperature side heat exchange unit 11 is preheated. The air introduced into the zone 4 is heated, and the air environment © the temperature of the preheating zone 4 is heated to 200 to 250 ° C by the introduction air heating by the low temperature side heat exchange unit 12. Although not shown, the preheating zone 4 and the 2 The temperature of the ambient gas in the preheating zone 9 may be controlled by the controller according to the temperature signal detected by the temperature sensor, and the radiant tube burner 8, the air fan 2a, the circulation fan 17a, and the like may be controlled by the controller. The RC fan in the device (not shown) is controlled thereby. In addition, the exhaust system 5 connected to the preheating zone 4 is self-heating zone 4 for process media such as liquid or gas used in other processes. The exhaust gas is heated, and the heat exchange unit 13 for the process is also provided. Since the exhaust gas from the preheating zone 4 is hot air, it can be directly used in other processes without the heat exchange unit 13 for the process. Embodiment metal strip continuous heat treatment equipment 1 In the heat treatment of the metal strip 3 by the heat treatment apparatus 1, the internal environment gas of the heating zone 7, the second preheating zone 9, and the preheating zone 4 is first heated. The radiant tube of the heating zone 7 is burned. The machine 8 generates heat to heat the non-oxidizing ambient gas enclosed in the heating zone 7 97135981 200925288. The internal ambient gas of the heating zone 7 also flows into the second preheating zone 9 through the narrow passage portion 15. The radiant tube burner 8 is operated. The generated waste heat exhaust gas flows to the exhaust gas discharge system 10. In the second preheating zone 9, the internal environment gas of the second preheating zone 9 is circulated in the circulation system 17 by the operation of the circulation fan 17a. The high-temperature waste heat of the exhaust gas of 10 is heated by the heat exchange of the high-temperature side heat exchange unit 11 to the internal environment gas of the second preheating zone 9 of the circulation circulation system 17 to maintain the internal environment of the 10 second preheating zone 9. The temperature of the gas, whereby the waste heat of the radiant tube burner 8 can be utilized to heat the non-oxidizing ambient gas in the second preheating zone 9 to lower the temperature of the exhaust gas. On the other hand, in the preheating zone 4, the air fan 2a is permeable. Operating from The air introduction system 2 introduces air to form an air atmosphere gas, and the exhaust gas containing the waste heat of the waste heat removal system 10 flows out from the high temperature side heat exchange unit 11 and then flows into the low temperature side heat exchange unit 12. The waste heat is heated by the heat exchange of the low temperature side heat exchange unit 12 to the air introduced into the preheating zone 4 through the air introduction system 2. Thereby, the waste heat of the radiant tube burner 8 is further utilized in the preheating zone 4 The air ambient gas is heated, and the exhaust gas temperature is further lowered. The exhaust gas containing the low-temperature waste heat is discharged from the waste heat exhaust system 10 from the outside. In the preheating zone 4, when the pressure in the preheating zone exceeds the preset pressure The air ambient gas is discharged to the exhaust system 5 by the pressure regulating valve 6. Thereby adjusting the pressure in the preheating zone. As a result, when the ambient gas temperature is raised in the preheating zone 4, the second preheating zone 9, and the interior of the heating zone 7, the metal strip 3 is fed from the intrusion section of the preheating zone 4 through the preheating zone. 4 Preheating 'Secondly, the second preheating zone 9 is sent to the second preheating zone 9 to be preheated at a higher temperature, and then sent from the heating zone 7 for heat treatment. On the other hand, the exhaust gas flowing through the exhaust system 5 connected to the preheating zone 4 flows into the process heat exchange section 13, thereby heating the process medium used in other processes, and the low temperature row is formed by the heating. Gas to the outside. In the metal strip continuous heat treatment apparatus i β of the present embodiment described above, between the preheating zone 4 and the heating zone 7, there is provided a second preheating of the metal strip 3 at a higher temperature than the preheating zone 4. The preheating zone 9 and the waste heat exhaust system 10 including the exhaust gas of the waste heat of the radiant tube burner 8 and the high temperature side heat exchange part η and the high temperature side heat exchange part 11 connected to the circulation system 17 of the second preheating zone 9 The downstream side is provided with a low temperature side heat exchange portion 12 connected to the air introduction system 2 of the preheating zone 4, so that the exhaust gas of the radiant tube burner 8 for heating the ambient gas of the heating zone 7 can be recovered in two stages. Efficiently used for the preheating of the metal strip 3 can promote energy conservation. Further, the discharge temperature of the exhaust gas of the radiant tube burner 8 can be lowered, and the structure of the outlet side of the exhaust gas discharge system 1 can be simplified. In the waste heat discharge system 10, the high temperature side heat exchange portion 11 and the low temperature side heat exchange portion 12 are sequentially disposed along the flow direction of the exhaust gas, and the high temperature side heat exchange portion 11 is applied to the second preheating portion 9 by the high temperature waste heat. The high-temperature ambient gas is heated, and the low-temperature side heat exchange unit 12 heats the air ambient gas of the preheating zone 4 at a lower temperature by the low temperature waste heat which is lowered in temperature, so that the preheating zone 4 97135981 13 200925288 and the 2 The temperature condition of the preheating zone 9 makes reasonable use of the waste heat of the radiant tube burner 8. Further, since the internal air of the preheating zone 4 is formed by introducing air into the air introduction system 2, a large amount of exhaust gas from the preheating zone 4 can be secured, and the exhaust heat can be effectively utilized. In the present embodiment, since the pressure adjusting valve 6' is provided in the exhaust system 5, the amount of the exhaust gas can be secured and the pressure in the preheating zone can be appropriately adjusted. Further, since the exhaust gas system 5 is provided with the process heat exchange unit 13, β, the exhaust gas discharged from the exhaust system 5 is efficiently heated to other process media, and the exhaust gas from the preheating zone 4 can be effectively utilized. heat. In the above-described embodiment, the pressure adjusting mechanism is described as an example of the pressure adjusting mechanism 6 provided in the exhaust system 5, but the present invention is not limited thereto, and a pressure releasing means such as a bubbler may be used. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a preferred embodiment of a continuous heat treatment apparatus for a metal strip according to the present invention. Fig. 2 is a schematic view showing an example of a conventional metal strip continuous heat treatment apparatus. Fig. 3 is a schematic view showing another example of a conventional metal strip continuous heat treatment apparatus. Fig. 4 is a schematic view showing still another example of the conventional metal strip & continuous heat treatment apparatus of Table tf. [Main component symbol description] 1 Continuous heat treatment of metal strips (4) 2 Air introduction system 97135981 200925288
2a 空氣扇 3 金屬條 4 預熱區 4a 裝入部 4b 送出部 5 排氣系統 6 壓力調整閥 7 加熱區 8 輻射管燃燒機 8a 鼓風機 9 第2預熱區 9a 導入部 10 廢熱排出系統 11 高溫侧熱交換部 12 低溫侧熱交換部 13 製程用熱交換部 14 密封部 15 窄通路部 16 輥 17 循壞糸統 17a 循環風扇 a 預熱區 97135981 15 200925288 b 加熱區 c 密封部 d 輻射管燃燒機 e 熱交換器 f 熱交換器 g 壓力調整閥 h 排氣系統 i 金屬條 ❿ 97135981 162a Air fan 3 Metal strip 4 Preheating zone 4a Loading section 4b Delivery section 5 Exhaust system 6 Pressure regulating valve 7 Heating zone 8 Radiant tube burner 8a Blower 9 2nd preheating zone 9a Introduction section 10 Waste heat exhaust system 11 High temperature Side heat exchange unit 12 Low temperature side heat exchange unit 13 Process heat exchange unit 14 Sealing portion 15 Narrow passage portion 16 Roller 17 Circulating system 17a Circulating fan a Preheating zone 97135981 15 200925288 b Heating zone c Sealing section d Radiant tube burning Machine e Heat exchanger f Heat exchanger g Pressure regulating valve h Exhaust system i Metal strip ❿ 97135981 16