1259257 玖、發明說明 (發明說明應敘明：發明所屬之技術領域、先前技術、内容、實施方式及圖式簡翠說明）1259257 发明, invention description (the description of the invention should be stated: the technical field, prior art, content, implementation and drawings of the invention)
【發明所屬之技術領域J 本發明係有關於一種單端型蓄熱式輻射管燃燒裝置及 其燃燒方法。 5 【先前技術】 單端型輻射管燃燒裝置係適用於難以設置U型輕射管 燃燒裝置或W型輻射管燃燒裝置之加熱設備者，此種單端 型輻射管燃燒裝置可例舉如曰本專利公開公報特開平7_ 83414號中揭示者。 1〇 即，如第2圖所示，前述單端型輻射管燃燒裝置1係 由前端閉塞之外管1和設於該外管丨之内部之内管2的雙 層官構造所構成，且，該内管2内配設有燃燒用空氣供給 管3，此外，該燃燒用空氣供給管3内配設有燃料氣體供 給管4,且將燃燒用空氣供給至形成在該燃燒用空氣供給 吕3和内官2之間的通路5，同時由燃料氣體供給管4供 給燃料氣體而在燃燒室6使其燃燒，且其燃燒排氣在外管 1之閉塞端部反轉之後，通過由外管i和内管2形成之環 狀空間7而加熱外管i的同時，也預熱與該燃燒排氣之流 向對向而供給之燃燒用空氣後被排出。 2〇 然而，如前所述者，預熱與燃燒排氣之流向對向而供 給之燃燒用空氣的構造中，由於可進行熱交換之熱傳面積 被限制，故爐内溫度為950t中熱回收率大約係⑽，熱 回收率有限度。 7-83414中揭示有如 因此，日本專利公開公報特開平 1259257 玖、發明說明 第3圖所示之構造之單端型蓄熱式輻射管燃燒裝置丁2。 該單端型蓄熱式輻射管燃燒裝置h係前端閉塞之外營 10和配設於該外管10内之内管11的雙層管構造，且分別 地，在外管10和内管11之後端部間具有外管蓄熱體12， 内管11之後端部亦具有内管蓄熱體13，且外管蓄熱體12 和内管蓄熱體13之後端係藉由切換閥ν而連通於燃燒用 空氣供給鼓風機14或排氣鼓風機15。 再者，内管11内，以及外管10和内管u形成之通路 16内分別配設有内管燃料喷嘴17和外管燃料喷嘴18。 此外，當驅動前述燃燒用空氣供給鼓風機14和排氣鼓 風機15，並且令切換閥ν成為圖示之狀態而由内管燃料噴 嘴17供給燃料氣體以點火時，燃燒氣體由内管u經過前 述通路16而加熱外管1〇之後，燃燒氣體會通過外管蓄熱 體12，而可回收燃燒排氣之顯熱達最大限度。 之後，切換切換閥ν，並且由外管燃料喷嘴18供給燃 料氣體itb日守，由於燃燒用空氣通過業經加熱之外管蓄熱 體12而充分被預熱再供於燃燒，故可加強節省能源的效果 ，且’可實現高效率之燃燒。TECHNICAL FIELD OF THE INVENTION The present invention relates to a single-ended regenerative radiant tube burning apparatus and a combustion method therefor. 5 [Prior Art] The single-end type radiant tube burning device is suitable for a heating device which is difficult to provide a U-shaped light-tube burning device or a W-type radiant tube burning device, and such a single-end type radiant tube burning device can be exemplified as The disclosure of Japanese Laid-Open Patent Publication No. Hei 7-83414. In other words, as shown in Fig. 2, the single-end type radiant tube burning device 1 is constituted by a double-layered official structure in which the tube 1 is closed at the front end and the inner tube 2 is provided inside the outer tube, and A combustion air supply pipe 3 is disposed in the inner pipe 2, and a fuel gas supply pipe 4 is disposed in the combustion air supply pipe 3, and combustion air is supplied to the combustion air supply unit. 3 and the passage 5 between the inner 2, while the fuel gas is supplied from the fuel gas supply pipe 4 to be combusted in the combustion chamber 6, and the combustion exhaust gas is passed through the outer pipe after the closed end of the outer pipe 1 is reversed. i and the annular space 7 formed by the inner tube 2 heat the outer tube i, and also preheat the combustion air supplied in the direction opposite to the flow of the combustion exhaust gas, and then discharge it. 2. However, as described above, in the structure in which the preheating and combustion exhaust gas are supplied to the combustion air, the heat transfer area of the heat exchange is limited, so the furnace temperature is 950 t. The recovery rate is approximately (10) and the heat recovery rate is limited. A single-end type regenerative radiant tube burning device D2 having the structure shown in Fig. 3 is disclosed in Japanese Laid-Open Patent Publication No. Hei. No. Hei. The single-end type regenerative radiant tube burning device h is a double-tube structure in which the front end occludes the outer dam 10 and the inner tube 11 disposed in the outer tube 10, and respectively, at the rear end of the outer tube 10 and the inner tube 11 The outer tube regenerator 12 is provided between the portions, and the inner tube 11 has an inner tube regenerator 13 at the rear end, and the outer tube regenerator 12 and the inner tube regenerator 13 are connected to the combustion air supply by the switching valve ν. Blower 14 or exhaust blower 15. Further, an inner tube fuel nozzle 17 and an outer tube fuel nozzle 18 are disposed in the inner tube 11 and in the passage 16 formed by the outer tube 10 and the inner tube u, respectively. Further, when the combustion air supply blower 14 and the exhaust blower 15 are driven, and the switching valve ν is in the state shown, the fuel gas is supplied from the inner tube fuel nozzle 17 to ignite, and the combustion gas passes through the aforementioned passage through the inner tube u. After heating the outer tube 1 ,, the combustion gas passes through the outer tube regenerator 12, and the sensible heat of the combustion exhaust gas can be recovered to the maximum. Thereafter, the switching valve ν is switched, and the fuel gas itb is supplied by the outer tube fuel nozzle 18, and since the combustion air is sufficiently preheated and supplied to the combustion by passing through the heat storage body 12, the energy saving can be enhanced. The effect, and 'can achieve high efficiency combustion.
進行輪流燃燒。 I閥V，並且由内管料燒 。其後，反覆前述步驟， L 明内】 發明欲解決課題 然而，前 然而’刖24單端型蓄熱式輻射管燃燒裝置 丁2中，因為 1259257 玖、發明說明 在高溫之預熱空氣中燃燒，所以燃燒火焰溫度高，熱氮氧 化物（thermal NOx)增多。又，為了要交替地切換燃燒用 空氣之供給和燃燒排氣之排出，所以須於燃燒用空氣配管 和燃燒排氣配管中設置切換閥，造成爐周圍因為配管而變 5 得複雜。 更進一步，由於係將内管燃料喷嘴17及外管燃料喷嘴 18配置於内管蓄熱體13和外管蓄熱體I]之下游側（前方 )的構造，故有燃料氣體和燃燒用空氣難以均一地混合， 特別是在燃料氣體之自燃溫度以下的低爐溫時，會頻頻發 10生點火不良而無法穩定燃燒的問題。 因此，本發明之目的即在提供一種可同時地實現減少 氮氧化物及加強節省能源的效果和高效率之燃燒，而不會 損傷燃燒喷嘴的單端型蓄熱式輻射管燃燒裝置，以及即使 可穩定燃燒之 在燃料氣體之自燃溫度以下之低爐溫時依然 單端型蓄熱式輻射管燃燒裝置之燃燒方法。 用以解決課題之方法 ’本發明係一種單端型蓄熱式輻射Take turns to burn. I valve V, and is burned by the inner tube. Thereafter, the above steps are repeated, and the invention is intended to solve the problem. However, the front-end of the '刖24 single-ended type regenerative radiant tube burning device D 2, because the 1259257 玖, the invention describes burning in the preheated air at a high temperature, Therefore, the combustion flame temperature is high and thermal NOx is increased. Further, in order to alternately switch the supply of the combustion air and the discharge of the combustion exhaust gas, it is necessary to provide a switching valve in the combustion air pipe and the combustion exhaust pipe, which causes the surrounding of the furnace to become complicated due to the piping. Further, since the inner tube fuel nozzle 17 and the outer tube fuel nozzle 18 are disposed on the downstream side (front side) of the inner tube heat storage body 13 and the outer tube heat storage body I], it is difficult to make the fuel gas and the combustion air uniform. Ground mixing, especially at a low furnace temperature below the autoignition temperature of the fuel gas, frequently causes a problem that the ignition is poor and the combustion cannot be stabilized. Accordingly, it is an object of the present invention to provide a single-ended regenerative radiant tube burning apparatus which can simultaneously achieve a reduction in nitrogen oxides and enhance energy saving effects and high efficiency combustion without damaging the combustion nozzle, and even if The combustion method of the single-end type regenerative radiant tube burning device is still stable at a low furnace temperature below the auto-ignition temperature of the fuel gas. Method for solving the problem ‘The present invention is a single-ended regenerative radiation
預定時間會交替地切換而進行輪流燃燒 ，且該内管蓄熱體 為了達成前述目的，本發明係一 I燃燒裝置’係在由一端閉窠夕总 1259257 玫、發明說明 或該外管蓄熱體會交替地回收其燃燒排氣之顯熱，而在高 溫之預熱空氣中進行燃燒者，其特徵在於： 前述2根進排氣管構造成前端部具有細腰型吸引管， 且則述進排乳官係利用具有排氣排出口之旁通管連通，且 5前述2根進排氣管中任一方之進排氣管係藉切換切換闕而 交替地連通於空氣供給裝置， 同時前述燃燒噴嘴包含有：外管燃燒喷嘴，係多數地 設置於前述外管環狀空間，且由中心部喷出燃料氣體，並 由其外周喷出冷卻空氣之雙層管構造者；及，内管燃燒嘴 10嘴’係配置於前述内管之中心部，且由中心部喷出燃料氣 體’並由其外周喷出冷卻空氣之雙層管構造者， +同時前述内管蓄熱體係安裝於前述内管和前述内管燃 、，嘴之刖部之間’又’前述外管蓄熱⑽安裝於前述 外管和前述外管燃燒噴嘴之前端部之間。 再者，本發明係一種單端型蓄熱式輕射管燃燒裝置之 燃燒方法’係在由_ AL ^ 知閉塞之外管以及於該外管之内側以 預疋間隔配置之内管所構成之單端輕射管之該外管和該内 管所形成之外管環狀空間與該内管内，内建外管蓄熱體和 内管蓄熱體，同時將該外管環狀空間和該内管之各後部盘 2根”地連通於空氣供給源和排«置的進排氣管連接 且母&預騎間父替地切換設於該外管環狀空間和内管 :、噴嘴之燃燒而進行輪流燃燒，a利用該内管蓄熱體 或该外管蓄熱體交替地回收其燃燒排氣之顯熱，而在高溫 之預熱空氣巾進行錢者，其特徵在於·· 20 1259257 玖、發明說明 爐内溫度在燃料氣體之自燃溫度以下時，將預混燃料 乳體供給至設於前述外管環狀空間或内管之前述燃燒喷嘴 中任-方而繼續連續燃燒，且若爐内溫度變成在燃料氣體 之自燃溫度以上時，#隔預定時間便交替地切換前述兩燃 5燒噴嘴之燃燒而輪流燃燒。 t貧施方式3 發明之實施形態 接著，依知第1圖說明本發明之一實施形態。 本發明之單端型蓄熱式輻射管燃燒裝置T，大致包含 有單端輻射管20，内管燃燒噴嘴26，外管燃燒噴嘴3〇， 内官蓄熱體心，外管蓄熱體R2,燃燒用空氣供給鼓風機 40 ’及燃料氣體供給源41。 此外’刖述單端輻射管2〇係由前端（爐内側）閉塞之 外& 21，以及於該外管21之内部以預定間隔配設之較該 15外官21短的内管22所構成，且内管22内部和外管21内 方利用外管前端部連通。另，前述外管21和内管22之後 端係閉塞的。 月述内管燃燒喷嘴26係以預定間隔而由後端安裝於前 述内官22之中心部且其前方形成有内管燃燒室&者，包 〇 &有中心部之用以喷出燃料氣體之第上燃料供給管27，及 以預疋間隔配設於其外周之第丨冷卻空氣供給管28，且前 述第1燃料供給管27和第1冷卻空氣供給管28之間形成 有第1冷卻空氣供給路29。 前述外管燃燒喷嘴30係對外管21和内管22相隔預定 1259257 玖、發明說明 間隔而由後端安裝於前述外管21和内管22所形成之環狀 空間23内且其前方形成有外管燃燒室&者，包含有中心 部之用以喷出燃料氣體之第2燃料供給管3丨，及以預定間 隔配没於其外周之第2冷卻空氣供給管32，且前述第2燃 5料供給管31和第2冷卻空氣供給管32之間形成有第2冷 卻空氣供給路33。 又，分別地，於前述内管22和第丨冷卻空氣供給管 28之間形成之環狀空間的前部裝填有内管蓄熱體r广而於 前述環狀空間23之前述第2冷卻空氣供給管32的外周裝 10填有外管蓄熱體r2。 更進一步，於前述外管21和内管22之後端部設有第 1進排氣管24a和第2進排氣管24b，且該等第i、第2進 排氣S 24a、24b分別具有第i、第2細腰型吸引管34a、 3朴，同時該等細腰型吸引f 3如、施部分係利用具有排 15氣排出口 36之旁通管35連通。 前述燃燒用空氣供給鼓風機4〇係藉由外管燃燒用空氣 切換閥V1而與第2細腰型吸引管34b連接，又，係藉由内 官燃燒用空氣切換閥％而與第i細腰型吸引管3知連接， 同時係藉由調節閥V3而連通於設在帛1冷卻空氣供給路 20 29之空氣供給管的混合器42和第2冷卻空氣供給路33。 岫述燃料氣體供給源41係藉由減壓閥V4、昇溫用電 磁閥v6而連通於設在第i冷卻空氣供給路之空氣供給 管的混合器42,同時係藉由減壓閥％而分別地，由内管 燃燒用燃料切換閥v7連通於第！燃料供給管27，又，由 10 1259257 玖、發明說明 外鈑燃燒用燃料切換閥V s連通於第2燃料供給管31。 接下來，說明前述構造之單端型蓄熱式輻射管燃燒裝 置T的操作。 首先，關閉外官燃燒用空氣切換閥Vi，開啟内管燃燒 5用空氣切換閥V2，開啟調節閥V3，開啟昇溫用電磁閥v6 ，關閉内官燃燒用燃料切換閥V7和外管燃燒用燃料切換閥 V8,且藉由第i細腰型吸引管34a而由燃燒用空氣供給鼓 風機40將燃燒用空氣從第！進排氣管24a供給至内管22 内，同時將藉混合器42預混之預混燃料氣體供給至前述内 10管燃燒噴嘴26之第1冷卻空氣通路29，且將設在内管燃 燒室S!内之圖中未顯示的引火燃燒器或火星塞等點火，藉 此點燃且於内管燃燒室S!開始燃燒。 然後，藉前述燃燒所產生之燃燒排氣在外管21之閉塞 端部反轉，且流過由内管22和外管21形成之環狀空間23 15並加熱外g蓄熱體r2，再從第2進排氣管⑽由設在旁 通官35之排氣排出口 36排出。此時，因為由第丄細腰型 吸引管34a喷出之燃燒用空氣的吸引作用所以一部份之 前述排氣被吸進燃燒用空氣内，而有助於減少氮氧化物。 月J所述者，雖然燃燒排氣加熱外管蓄熱體&的同時 也加熱外管燃燒噴嘴3〇,但是因為由調節閥預定量 之=卻用空氣供給至外管燃燒噴嘴3G之第2冷卻用空氣供 給官32 ’所以可防止外管燃燒噴嘴％之熱損傷及殘留燃 料之裂解的產生。 卜僅以則述内官燃燒喷嘴26所行之燃燒係持續到 11 1259257 玖、發明說明 爐内溫度到達預定溫度，例如燃料氣體之自燃溫度以上為 止。 這疋因為若爐内溫度到達例如燃料氣體之自燃溫度之 鈉由第1燃枓供給管27供給燃料氣體，則由於該燃料氣 5體係以例如約100m/秒之高速噴出，故無法充分地與燃燒 用空氣混合等的理由，燃燒就會不穩定。 因此，若爐内溫度到達預定溫度，便關閉前述内管燃 燒用空氣切換閥V2和昇溫用電磁閥V6，開啟外管燃燒用 空氣切換閥V1和外管燃燒用燃料切換閥V8，且由第2燃 10料供給管31供給業已調節於預定壓力之燃料氣體，同時由 第2進排氣管24b供給燃燒用空氣，並利用設在外管燃燒 至S2内之圖中未顯示的點火裝置點火燃燒。此時，由於燃 燒用空氣通過外管蓄熱體R2,且在其間被預熱，故可立即 進行穩定之燃燒。 15 還有’前述燃燒排氣在外管21之閉塞端部反轉，且流 經内管22内而加熱内管蓄熱體Ri，再通過第丨進排氣管 24a由排氣排出口 36排出。 此時，雖然内管燃燒喷嘴26藉高溫之燃燒排氣加熱， 但疋因為由調節閥Vs將預定量之冷卻空氣供給至第1冷卻 20空氣供給路29，所以亦可防止内管燃燒噴嘴26之熱損傷 及殘留燃料之裂解的產生。 之後’經過預定時間後，例如1 〇秒，便關閉外管燃燒 用空氣切換閥V!和外管燃燒用燃料切換閥v8，開啟内管 燃燒用空氣切換閥V2和内管燃燒用燃料切換閥v7,使燃 12 1259257 玖、發明說明 料氣體由第1燃料供給管27，以及業已藉由内管蓄熱體Rl 預…、之燃燒用空氣噴出至内管燃燒室&，且利用圖中未顯 不的點火裝置點火而進行穩定之燃燒。該燃燒排氣通過而 加熱外管蓄熱體R2之後，藉由第2進排氣管24b而由摒氣 5排出口 36排出。此時，雖然外管燃燒喷嘴藉高溫之燃 燒排氣加熱，但是因為由調節閥％將預定量之冷卻用空氣 供給至第2冷卻用空氣供給管32，所以亦可防止外管燃燒 喷嚆30之熱損傷及殘留燃料之裂解的產生。 之後，每隔預定時間，反覆前述動作。 10 此外，所使用之燃料只要是氣體燃料即可，並沒有特 別限定。特別係使用丙烷氣和丁烷氣等高熱量值氣體時， 因為燃燒器轉弱時之燃燒性提高及切換輪流燃燒時可產生 餘燃（即使燃燒切換成另一方之燃燒器，還是有火焰存在 於這一方之燃燒器的現象），所以宜利用燃燒用空氣稀釋前 15述燃料，且令其成為將低發熱量調節成hl = 5000〜10000kcal/m3N之稀釋燃料。 又，切換輪流燃燒時之燃料氣體及燃燒用空氣時，當 然是控制成：切換閥之開啟動作係先開啟燃燒用空氣切換 閥之後再開啟燃燒用燃料切換閥，且關閉動作係先關閉燃 20 燒用燃料切換閥再關閉燃燒用空氣切換閥。 更進一步’前述實施形態中係於第1、第2進排氣管 24a、24b設置細腰型吸引管34a、34b，且藉著來自一方之 進排氣管之燃燒用空氣之由細腰型吸引管喷出的運動量， 並由另^一方之進排氣管措由旁通管3 5而將一部份之燃燒排 13 1259257 玖、發明說明 氣吸進燃燒用空氣，而藉排氣循環達成減少氮氧化物的效 果’不過欲達成減少氮氧化物的效果，當然也可係其他之 構造。只是若係前述構造，就不須在燃燒用空氣供給鼓風 機40之吸引側設置排氣循環配管或排氣切換閥，可成為構 5 造簡單且價廉之設備。 又，刖述實施形悲中係顯示爐内溫度在燃料氣體之自 燃溫度以下時，由内管燃燒喷嘴26之第#卻空氣供給路 29供給預混燃料氣體而使之燃燒的情形，不過亦可由第工 燃料供給管27供給預混燃料氣體。 〇 更進一步，亦可由外管燃燒噴嘴30之第2冷卻空氣供 給路33或第2燃料供給管31供給預混燃料氣體。 發明之效果 15 20 由以上之說明可知依據申請專利範圍第丨項之發明， 燃燒方法係輪流燃燒，由於其燃燒排氣交替地通過設在内 管内以及内管和外管間之空間的蓄熱體，且燃燒用空氣通 過在前述步驟中被㈣之蓄熱體而被預熱，故熱回收效率 可達80〜50%，且可進行節省能源和熱效率高之燃燒。此 外，由於設在内管以及内管和外管之環狀空間的姆燒喷嘴 '由中央部《燃料氣體，且由其外周喷出冷卻空氣之雙 層管構造者’故燃燒喷嘴不會因燃燒排氣而熱性燒毀。 又，由於2根進排氣管具有細腰型吸弓㊉，且前述细 腰型吸引管部分係利用具有排氣排出口之旁通管連通，故 一部份之燃燒排氣被吸進由細腰型”管心之燃燒用空 氣並供給出來（自行排氣循環)，因此不需排氣切換二： 14 1259257 玖、發明說明 時不須在燃燒用空氣供給鼓風機之吸引側設置排氣循環配 管等，而形成簡單之構造且可達成減少氮氧化物的效果。 又，依據申請專利範圍第2項之發明，由於爐内溫度 在燃料氣體之自燃溫度以下時，將預混燃料氣體供給至設 5 於外管環狀空間或内管之燃燒喷嘴中任一方而進行連續燃 燒，故即使在低爐溫時依然可進行穩定之燃燒。The predetermined time is alternately switched to perform the alternate combustion, and in order to achieve the above object, the present invention is an I-combustion device that is closed at one end by a total of 1259257, the invention description or the external heat storage body alternates. The sensible heat of the combustion exhaust gas is recovered, and the combustion is performed in the preheated air at a high temperature, wherein the two intake and exhaust pipes are configured to have a thin waist type suction pipe at the front end portion, and the milk is introduced into the milk. The official system is connected by a bypass pipe having an exhaust gas discharge port, and the inlet and exhaust pipes of any one of the two inlet and exhaust pipes are alternately connected to the air supply device by switching switching ports, and the combustion nozzle includes The outer tube combustion nozzle is a double tube structure in which the outer tube annular space is disposed in the outer tube annular space and the fuel gas is ejected from the center portion and the cooling air is ejected from the outer circumference; and the inner tube burner 10 The nozzle is a double-tube structure in which a fuel gas is ejected from a central portion and a cooling gas is ejected from the outer periphery thereof, and the inner tube heat storage system is attached to the inner tube. And the inner tube is combusted, and the outer tube heat storage (10) is mounted between the outer tube and the front end portion of the outer tube combustion nozzle. Furthermore, the present invention is a combustion method for a single-end type regenerative light-tube burning device, which is constituted by an outer tube which is closed by an _AL^ and an inner tube which is disposed at an inner side of the outer tube at a pre-interval interval. The outer tube of the single-ended light-emitting tube and the annular space formed by the inner tube and the inner tube, the inner tube regenerator and the inner tube regenerator, and the outer tube annular space and the inner tube Each of the rear discs 2 is connected to the air supply source and the inlet and exhaust pipes of the row and the parent & pre-riding parent is alternately set in the outer tube annular space and the inner tube: the combustion of the nozzle In turn, the combustion is carried out, and the inner tube regenerator or the outer tube regenerator is used to alternately recover the sensible heat of the combustion exhaust gas, and the preheated air towel at a high temperature is used for the money, which is characterized by 20 20 259 257 玖When the temperature in the furnace is below the autoignition temperature of the fuel gas, the premixed fuel emulsion is supplied to any of the combustion nozzles provided in the annular space of the outer tube or the inner tube to continue continuous combustion, and if the furnace is in the furnace When the temperature becomes above the auto-ignition temperature of the fuel gas, The time is alternately switched between the combustion of the two combustion burners and the combustion is carried out in turn. t lean mode 3 embodiment of the invention Next, an embodiment of the invention will be described with reference to Fig. 1. The single-end type regenerative radiation of the present invention The tube burning device T generally includes a single-end radiant tube 20, an inner tube burning nozzle 26, an outer tube burning nozzle 3〇, a inner heat storage body core, an outer tube heat storage body R2, a combustion air supply blower 40', and a fuel gas supply. Source 41. In addition, the description of the single-ended radiant tube 2 is occluded from the front end (inside of the furnace) & 21, and the inside of the outer tube 21 is disposed at a predetermined interval and is shorter than the outer portion 21 of the 15 The tube 22 is formed, and the inside of the inner tube 22 and the inner side of the outer tube 21 are communicated by the front end portion of the outer tube. Further, the outer tube 21 and the inner tube 22 are closed at the rear end. The inner tube combustion nozzles 26 are arranged at predetermined intervals. And the rear end is installed in the center portion of the inner portion 22 and has an inner tube combustion chamber & the front portion, and the upper portion of the fuel supply tube 27 for discharging the fuel gas. The second cooling air is disposed on the outer circumference of the pre-interval interval The supply pipe 28 is formed with a first cooling air supply path 29 between the first fuel supply pipe 27 and the first cooling air supply pipe 28. The outer pipe combustion nozzle 30 is spaced apart from the outer pipe 21 by the inner pipe 21 by a predetermined number of 1259257 玖According to the invention, the rear end is installed in the annular space 23 formed by the outer tube 21 and the inner tube 22, and the outer tube combustion chamber & is formed in the front side, and includes a central portion for ejecting fuel gas. The second fuel supply pipe 3A and the second cooling air supply pipe 32 that is disposed at a predetermined interval on the outer circumference thereof are formed between the second fuel material supply pipe 31 and the second cooling air supply pipe 32. 2, the cooling air supply path 33. Further, the front portion of the annular space formed between the inner tube 22 and the second cooling air supply pipe 28 is filled with the inner tube heat storage body r in the annular space 23 The outer peripheral casing 10 of the second cooling air supply pipe 32 is filled with the outer pipe heat storage body r2. Further, the first intake pipe 24a and the second intake pipe 24b are provided at the rear end portions of the outer pipe 21 and the inner pipe 22, and the i-th and second intake and exhaust gases S 24a, 24b respectively have The i-th and second-thin-thin-type suction pipes 34a and 3 are at the same time, and the thin waist-type suctions f3 are connected to each other by a bypass pipe 35 having a discharge port 36 of the discharge port 15. The combustion air supply blower 4 is connected to the second thin waist suction pipe 34b by the outer pipe combustion air switching valve V1, and is connected to the i-th waist by the inner combustion air switching valve %. The type suction pipe 3 is connected to the mixer 42 and the second cooling air supply path 33 provided in the air supply pipe of the crucible 1 cooling air supply path 20 29 by the regulating valve V3. The fuel gas supply source 41 is connected to the mixer 42 of the air supply pipe provided in the i-th cooling air supply path by the pressure reducing valve V4 and the temperature increasing electromagnetic valve v6, and is respectively separated by the pressure reducing valve %. Ground, the fuel switching valve v7 for internal combustion is connected to the first! Further, the fuel supply pipe 27 is connected to the second fuel supply pipe 31 by the external combustion fuel switching valve V s according to the description of the invention. Next, the operation of the single-end type regenerative radiant tube burning device T of the aforementioned configuration will be explained. First, the external combustion air switching valve Vi is closed, the inner tube combustion 5 air switching valve V2 is opened, the regulating valve V3 is opened, the temperature increasing electromagnetic valve v6 is turned on, the internal combustion fuel switching valve V7 and the outer tube combustion fuel are turned off. The valve V8 is switched, and the combustion air is supplied from the combustion air supply blower 40 by the i-th thin waist suction pipe 34a! The intake and exhaust pipe 24a is supplied into the inner pipe 22, and the premixed fuel gas premixed by the mixer 42 is supplied to the first cooling air passage 29 of the inner 10-tube combustion nozzle 26, and is disposed in the inner pipe combustion chamber. The ignition burner or the spark plug, not shown in the figure in S!, is ignited, thereby igniting and starting to burn in the inner tube combustion chamber S!. Then, the combustion exhaust gas generated by the combustion is reversed at the closed end of the outer tube 21, and flows through the annular space 23 15 formed by the inner tube 22 and the outer tube 21 and heats the outer g regenerator r2, and then from the The 2 intake and exhaust pipes (10) are exhausted by an exhaust discharge port 36 provided at the bypass door 35. At this time, a part of the exhaust gas is sucked into the combustion air due to the suction action of the combustion air discharged from the second thin waist suction pipe 34a, contributing to the reduction of nitrogen oxides. In the case of the month J, the combustion exhaust gas heats the outer tube regenerator & also heats the outer tube combustion nozzle 3〇, but is supplied to the outer tube combustion nozzle 3G by the predetermined amount of the regulating valve. The cooling air supply unit 32' prevents heat generation of the outer tube combustion nozzle and cracking of residual fuel. Only the combustion system in which the internal combustion nozzle 26 is operated continues until 11 1259257 玖, and the invention indicates that the furnace temperature reaches a predetermined temperature, for example, the autoignition temperature of the fuel gas. In this case, if the temperature in the furnace reaches, for example, the sodium of the auto-ignition temperature of the fuel gas is supplied from the first combustion supply pipe 27, the fuel gas 5 system is ejected at a high speed of, for example, about 100 m/sec, so that it cannot be sufficiently Combustion is unstable because of the mixing of combustion air. Therefore, when the temperature in the furnace reaches a predetermined temperature, the inner tube combustion air switching valve V2 and the temperature increasing electromagnetic valve V6 are closed, and the outer tube combustion air switching valve V1 and the outer tube combustion fuel switching valve V8 are opened, and (2) The fuel supply pipe 31 supplies fuel gas that has been adjusted to a predetermined pressure, and the combustion air is supplied from the second intake and exhaust pipe 24b, and is ignited and burned by an ignition device not shown in the figure in which the outer pipe is burned to S2. . At this time, since the combustion air passes through the outer tube heat accumulator R2 and is preheated therebetween, stable combustion can be performed immediately. Further, the combustion exhaust gas is reversed at the closed end portion of the outer tube 21, flows through the inner tube 22 to heat the inner tube heat storage body Ri, and is discharged from the exhaust gas discharge port 36 through the first intake and exhaust pipe 24a. At this time, although the inner tube combustion nozzle 26 is heated by the high-temperature combustion exhaust gas, since a predetermined amount of cooling air is supplied to the first cooling 20 air supply path 29 by the regulating valve Vs, the inner tube combustion nozzle 26 can also be prevented. Thermal damage and cracking of residual fuel. Then, after a predetermined period of time, for example, 1 second, the outer tube combustion air switching valve V! and the outer tube combustion fuel switching valve v8 are closed, and the inner tube combustion air switching valve V2 and the inner tube combustion fuel switching valve are opened. V7, the fuel 12 1259257 玖, the invention gas is discharged from the first fuel supply pipe 27, and the combustion air which has been preheated by the inner pipe heat storage body R1 to the inner pipe combustion chamber & The igniting device is ignited for stable combustion. After the combustion exhaust gas passes through, the outer tube heat storage body R2 is heated, and then discharged from the helium gas 5 discharge port 36 by the second intake and exhaust pipe 24b. At this time, although the outer tube combustion nozzle is heated by the high-temperature combustion exhaust gas, since a predetermined amount of cooling air is supplied to the second cooling air supply pipe 32 by the regulator valve %, the outer tube combustion squirt 30 can also be prevented. Thermal damage and cracking of residual fuel. Thereafter, the above-described actions are repeated every predetermined time. Further, the fuel to be used is not particularly limited as long as it is a gaseous fuel. In particular, when a high calorific value gas such as propane gas or butane gas is used, since the combustibility is improved when the burner is weak and the afterburning is switched, the afterburning may occur (even if the combustion is switched to the other burner, there is a flame present). In the case of the burner of this side, it is preferable to dilute the first 15 fuels with combustion air, and to make it a diluted fuel having a low calorific value adjusted to hl = 5000 to 10000 kcal/m3N. Further, when switching the fuel gas and the combustion air during the alternate combustion, it is of course controlled so that the opening operation of the switching valve is to first turn on the combustion air switching valve and then turn on the combustion fuel switching valve, and the closing operation is to first turn off the combustion. The fuel switching valve is closed and the combustion air switching valve is closed. Further, in the above-described embodiment, the thin waist type suction pipes 34a and 34b are provided in the first and second intake and exhaust pipes 24a and 24b, and the combustion air is supplied from one of the intake and exhaust pipes. The amount of movement of the suction pipe is discharged, and the combustion pipe 13 1259257 一, the invention description gas is sucked into the combustion air by the bypass pipe 35, and the exhaust gas is circulated. Achieving the effect of reducing nitrogen oxides 'but to achieve the effect of reducing nitrogen oxides, of course, can also be other structures. According to the above configuration, it is not necessary to provide an exhaust circulation pipe or an exhaust gas switching valve on the suction side of the combustion air supply blower 40, which makes it a simple and inexpensive device. Further, the description of the embodiment shows that when the temperature in the furnace is below the autoignition temperature of the fuel gas, the premixed fuel gas is supplied from the air supply passage 29 of the inner tube combustion nozzle 26 to burn it. The premixed fuel gas can be supplied from the first fuel supply pipe 27. Further, the premixed fuel gas may be supplied from the second cooling air supply path 33 or the second fuel supply pipe 31 of the outer tube combustion nozzle 30. According to the invention of the third aspect of the invention, the combustion method is a rotary combustion, in which the combustion exhaust gas alternately passes through the heat storage body provided in the inner tube and the space between the inner tube and the outer tube. And the combustion air is preheated by the regenerator of (4) in the foregoing step, so the heat recovery efficiency can reach 80 to 50%, and energy saving and high heat efficiency combustion can be performed. In addition, since the m-burning nozzle 'in the annular space of the inner tube and the inner tube and the outer tube is formed by the central portion "fuel gas, and the double-layer tube structure of the cooling air is ejected from the outer circumference thereof", the combustion nozzle is not caused by Burning exhaust gas and burning it hot. Moreover, since the two intake and exhaust pipes have a thin waist type suction bow ten, and the thin waist type suction pipe portion is connected by a bypass pipe having an exhaust gas discharge port, a part of the combustion exhaust gas is sucked into The thin waist type "combustion air is supplied and supplied (self-venting cycle), so there is no need to switch the exhaust gas: 14 1259257 玖, invention instructions do not need to set the exhaust cycle on the suction side of the combustion air supply blower A pipe or the like is formed to form a simple structure and the effect of reducing nitrogen oxides can be achieved. Further, according to the invention of claim 2, since the furnace temperature is below the autoignition temperature of the fuel gas, the premixed fuel gas is supplied to Since 5 is continuously burned in one of the outer tube annular space or the inner tube combustion nozzle, stable combustion can be performed even at a low furnace temperature.
L圖式簡單說明3 第1圖係本發明之單端型蓄熱式輻射管燃燒裝置的概 略圖。 10 第2圖係習知單端型輻射管燃燒器的概略圖。 第3圖係習知單端型蓄熱式輻射管燃燒器的概略圖。 【圖式之主要元件代表符號表】BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a single-end type regenerative radiant tube burning apparatus of the present invention. 10 Fig. 2 is a schematic view of a conventional single-ended radiant tube burner. Fig. 3 is a schematic view showing a conventional single-end type regenerative radiant tube burner. [The main components of the diagram represent the symbol table]
1，10,21···外管 18...外管燃料喷嘴 2，11，22·.·内管 20...單端輻射管 3...燃燒用空氣供給管 24a...第1進排氣管 4...燃料氣體供給管 24b...第2進排氣管 5，16···通路 26...内管燃燒喷嘴 6...燃燒室 27...第1燃料供給管 7,23...環狀空間 28...第1冷卻空氣供給管 12，R2...外管蓄熱體 29···第1冷卻空氣供給路 13，R1...内管蓄熱體 30...外管燃燒噴嘴 14,40...燃燒用空氣供給鼓風機 31…第2燃料供給管 15…排氣直支風機 32…第2冷卻空氣供給管 17…内管燃料噴嘴 33·.·第2冷卻空氣供給路 15 1259257 玖、發明說明 34a…第1細腰型吸引管 34b...第2細腰型吸引管 35.. .旁通管 36…排氣排出口 41.. .燃料氣體供給源 42.. .混合器1,10,21···Outer tube 18...outer tube fuel nozzle 2,11,22·.·inner tube 20...single-ended radiant tube 3...combustion air supply tube 24a... 1 intake and exhaust pipe 4...fuel gas supply pipe 24b...second intake pipe 5,16···passage 26...inner pipe combustion nozzle 6...combustion chamber 27...first Fuel supply pipes 7, 23... annular space 28... first cooling air supply pipe 12, R2... outer pipe heat storage body 29···first cooling air supply path 13, R1... inner pipe Heat storage body 30...Outer tube combustion nozzles 14,40...Combustion air supply blower 31...Second fuel supply pipe 15...Exhaust straight fan 32...Second cooling air supply pipe 17...Inner pipe fuel nozzle 33 ···Second cooling air supply path 15 1259257 玖, invention description 34a... first thin waist suction pipe 34b... second thin waist suction pipe 35.. bypass pipe 36... exhaust discharge port 41. .. fuel gas supply source 42.. mixer
51.. .内管燃燒室 52.. .外管燃燒室 t?t2. . 乃…單端型輻射管燃燒裝置 V···切換閥51.. .Inner tube combustion chamber 52.. .Outer tube combustion chamber t?t2. . . . is a single-end type radiant tube burner V··· switching valve
VI...外管燃燒用空氣切換閥 V2...内管燃燒用空氣切換閥 V3...調節閥 V4，V5…減壓閥 V6...昇溫用電磁閥 V7...内管燃燒用燃料切換閥 V8...外管燃燒用燃料切換閥 16VI... outer tube combustion air switching valve V2... inner tube combustion air switching valve V3... regulating valve V4, V5... pressure reducing valve V6... heating solenoid valve V7... inner tube burning Fuel switching valve V8... external tube combustion fuel switching valve 16