JP2004138322A

JP2004138322A - Hot air generator

Info

Publication number: JP2004138322A
Application number: JP2002303472A
Authority: JP
Inventors: Takashi Yamagami; 山上　俊
Original assignee: Osaka Gas Co Ltd
Current assignee: Osaka Gas Co Ltd
Priority date: 2002-10-17
Filing date: 2002-10-17
Publication date: 2004-05-13

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot air generator dispensing with an independent heat exchanger by getting the hot air in a combustion chamber directly through the air, miniaturizing the device, and improving the heat exchanging efficiency. <P>SOLUTION: A combustion device comprises burners 2a, 2b on a pair of combustion chambers 1a, 1b, and thermal storage bodies 3 for storing the heat of combustion gas of the burners 2a, 2b mounted on the combustion chambers 1a, 1b, and the pair of burners 2a, 2b are alternately operated. The combustion chambers 1a, 1b are respectively provided with supply and exhaust ports 10a, 10b and hot air taking-out ports 11a, 11b, the heat of the combustion gas is passed through the thermal storage body 3 to be stored therein, and discharged to the external from the supply and exhaust port in one of the combustion chambers wherein the burner is operated, and the hot air obtained by introducing the air supplied from the supply and exhaust port and performing the heat exchanging in the thermal storage body 3 is taken out from the hot air taking-out port in the other combustion chamber where the burner is not operated. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、乾燥等をするために供給する熱風を発生する熱風発生装置に関するものである。
【０００２】
【従来の技術】
一般に燃料ガスを燃焼させることにより熱を得て熱風を発生するようになっている。このとき燃焼ガスをそのまま熱風として供給するのが最も熱効率がよいが、燃焼ガスには燃焼生成水（水蒸気）や炭酸ガス（ＣＯ_２）、窒素酸化物（ＮＯ_Ｘ）が含まれており、これらが被乾燥物に好ましくない影響を与えることがある。そこで燃焼する部位に熱交換器を配置し、燃焼ガスと隔離した熱交換器に空気を供給して熱交換器で空気を加熱して熱風の発生を行うようになっている。
【０００３】
このように熱交換器で燃焼ガスと空気の熱交換をして熱風を得るもので熱効率よくさせる熱風発生装置としては図６に示すものがある（例えば、特許文献１参照）。これは一対の燃焼室１ａ，１ｂを並設してあり、各燃焼室１ａ，１ｂに夫々バーナ２ａ，２ｂを設けてあり、各バーナ２ａ，２ｂに蓄熱体３を設けてある。各バーナ２ａ，２ｂには燃料供給管４を連通させてあると共に給排気管５ａ，５ｂを連通させ、ブロア９から空気を供給する供給から空気供給管６と排気管７と給排気管５ａ，５ｂとの間に四方切り替え弁のような切り替えユニット８を設けてある。そして一対のバーナ２ａ，２ｂは交互に燃焼させるようになっており、バーナ２ａが燃焼しているときは空気供給管６から給排気管５ａを介してバーナ２ａに空気が供給され、蓄熱体３から熱を得て加熱された空気がバーナ２ａの燃焼用空気として供給され、燃焼室１ａで燃焼した燃焼ガスが燃焼室１ｂからバーナ２ａの蓄熱体３を通ることで排気から蓄熱され、排気が給排気管５ｂ、排気管７を通って外部に排気される。一方、バーナ２ｂが燃焼しているときは空気供給管６から給排気管５ｂを介してバーナ２ｂに空気が供給され、蓄熱体３から熱を得て加熱された空気がバーナ２ｂの燃焼用空気として供給され、燃焼室１ｂで燃焼した燃焼ガスが燃焼室１ａからバーナ２ｂの蓄熱体３を通ることで排気から蓄熱され、排気が給排気管５ａ、排気管７を通って外部に排気される。上記燃焼室１ａ，１ｂには熱交換器３１が配置されており、この熱交換器３１に空気が通されることで熱交換器３１で熱交換して熱風が得られるようになっている。
【０００４】
【特許文献１】
特開平１０−１１１０８７号公報
【０００５】
【発明が解決しようとする課題】
上記の従来例にあっては、排気の熱を蓄熱体に回収して燃焼用空気を加熱することで燃焼させるために燃焼の効率がよいが、燃焼室１ａ，１ｂ内に熱交換器３１を配置して熱交換器３１に空気を通すことにより熱交換して熱風を発生しており、効果的に熱交換させるためには大きな体積の熱交換器３１を組み込まなければならなく、熱風発生装置が大型になるという問題があり、また熱交換器３１で間接的に熱交換するために熱交換の効率も悪くなるという問題がある。
【０００６】
本発明は上記の点に鑑みてなされたものであり、燃焼室内に直接空気を通して熱風を得ることにより上記別途熱交換器を要せず装置を小型化できると共に熱交換の効率も向上できる熱風発生装置を提供することを課題とする。
【０００７】
【課題を解決するための手段】
上記課題を解決するための本発明の熱風発生装置は、一対の燃焼室１ａ，１ｂに夫々バーナ２ａ，２ｂを備えると共に各燃焼室１ａ，１ｂにバーナ２ａ，２ｂの燃焼ガスの熱を蓄熱する蓄熱体３を備え、一対のバーナ２ａ，２ｂが交互に燃焼するようにした燃焼装置において、各燃焼室１ａ，１ｂに給排気口１０ａ，１０ｂと熱風取り出し口１１ａ，１１ｂとを夫々設け、バーナ２ａ（または２ｂ）が燃焼している一方の燃焼室１ａ（または１ｂ）では燃焼ガスが蓄熱体３を通って蓄熱体３に蓄熱して給排気口１０ａ（または１０ｂ）から外部に排気されるようにすると共にバーナ２ｂ（または２ａ）が燃焼していない他方の燃焼室１ｂ（または１ａ）では給排気口１０ｂ（または１０ａ）から給気した空気を導入して蓄熱体３で熱交換して得られる熱風を熱風取り出し口１１ｂ（または１１ａ）から取り出すようにしたことを特徴とする。
【０００８】
上記のように構成したことにより、バーナ２ａが燃焼しているときは燃焼室１ａの燃焼ガスが蓄熱体３を通って蓄熱して給排気口１０ａから排気され、一方、給排気口１０ｂから燃焼室１ｂに空気が給気されて燃焼室１ｂ内で蓄熱体３を通ることで熱交換して得られた熱風が熱風取り出し口１１ｂから取り出される。またバーナ２ｂが燃焼しているときは燃焼室１ｂの燃焼ガスが蓄熱体３を通って蓄熱して給排気口１０ｂから排気され、一方、給排気口１０ａから燃焼室１ａに空気が給気されて燃焼室１ａ内で蓄熱体３を通ることで熱交換して得られた熱風が熱風取り出し口１１ａから取り出される。これにより燃焼室１ａ，１ｂの蓄熱体３を空気が直接通ることで燃焼ガスと間接的に熱交換した熱風が得られるものであって、別途の熱交換器を要せず、装置を小型化できると共に熱効率を向上できる。
【０００９】
また熱風取り出し口１１ａ，１１ｂから取り出された熱風を通す熱風管２６にも蓄熱体３０を設けたことを特徴とすることも好ましい。この場合、熱風管２６を介して供給する熱風の温度を蓄熱体３０にて均一にでき、均一な温度の熱風を供給できる。
【００１０】
【発明の実施の形態】
１つの筐体１２には一対の燃焼室１ａ，１ｂを並設してあり、各燃焼室１ａ，１ｂの上部にはバーナ２ａ，２ｂを夫々装着してあり、燃焼室１ａ，１ｂの内部の下部にはアルミナボールのような通気性のある蓄熱体３を装填してある。燃焼室１ａ，１ｂの下部には給排気口１０ａ，１０ｂを設けてあり、燃焼室１ａ，１ｂの上部には熱風取り出し口１１ａ，１１ｂを設けてある。
【００１１】
燃料ガスを供給する燃料供給管１３は２つの分岐管１３ａ，１３ｂに分岐してあり、各分岐管１３ａ，１３ｂを夫々バーナ２ａ，２ｂに連結してある。各分岐管１３ａ，１３ｂにはこの管路を開閉する開閉弁１４ａ，１４ｂと流量調整弁１５ａ，１５ｂを配置してある。大気中から空気を取り入れて送風するブロア１６から空気送風管１７を介して空気が送風されるようになっているが、この空気送風管１７には一対の燃焼用空気供給管１８ａ，１８ｂを連結してあり、一対の燃焼用空気供給管１８ａ，１８ｂを夫々バーナ２ａ，２ｂに連結してある。
【００１２】
筐体１２の下部の前面には四方切り替え弁構造の低温側切り替えユニット１９を設けてあり、４つのポートである給気口２０と一対の給排気口２１ａ，２１ｂと排気口２２の連通の切り替えを行うようになっている。低温側切り替えユニット１９の給排気口２１ａと燃焼室１ａの給排気口１０ａとが連通しており、低温側切り替えユニット１９の給排気口２１ｂと燃焼室１ｂの給排気口１０ｂとが連通しており、低温側切り替えユニット１９の給気口２０と空気送風管１７とが連通しており、排気口２２は大気に開放してある。
【００１３】
筐体１２の上部の前面には三方切り替え弁構造の高温側切り替えユニット２３を設けてあり、３つのポートである一対の入口２４ａ，２４ｂと出口２５の連通の切り替えを行うようになっている。この高温側切り替えユニット２３の入口２４ａと燃焼室１ａの熱風取り出し口１１ａとを連通させてあり、高温側切り替えユニット２３の入口２４ｂと燃焼室１ａの熱風取り出し口１１ｂとを連通させてある。高温側切り替えユニット２３の出口２５から熱風管２６を導出してあり、熱風を利用する設備の一例としての鋳物砂再生装置２７に連結してあり、熱風管２６を介して送られた熱風で鋳物砂を乾燥することができるようになっている。
【００１４】
熱風管２６には温度検出部２８を設けてあり、温度検出部２８で検出した温度が制御部２９に入力され、熱風の温度が一定になるように開閉弁１４ａ，１４ｂの開閉の時間の制御されるようになっている。
【００１５】
上記のように熱風発生装置が構成され、各燃焼室１ａ，１ｂでバーナ２ａ，２ｂが交互に燃焼するようになっており、バーナ２ａ，２ｂで燃焼するとき各燃焼室１ａ，１ｂの蓄熱体３に蓄熱できるようになっている。バーナ２ａが燃焼するときは燃焼供給管１３から分岐管１３ａ，１３ｂを介してバーナ２ａ，２ｂに燃料ガスが供給されると共にブロア１６から空気送風管１７、燃焼用空気供給管１８ａ，１８ｂを介してバーナ２ａ，２ｂに燃焼用空気が供給されるようになっている。燃焼室１ａのバーナ２ａが燃焼しているときは燃焼室１ｂのバーナ２ｂが消火されており、燃焼室１ａで燃焼した燃焼ガスが図３の矢印Ａに示すように蓄熱体３を通ることで蓄熱体３に熱が与えられ、この燃焼ガスの排気が図３の矢印Ｂ、Ｃに示すように給排気口１０ａ，２１ａを介して排気口２２から大気中に排出され、一方、空気送風管１７から送風される空気は矢印Ｄ、Ｅ、Ｆに示すように給気口２０、給排気口１０ｂ，２１ｂを介して燃焼室１ｂに供給され、この空気が図３の矢印Ｇに示すように燃焼室１ｂの蓄熱体３を通って蓄熱体３と熱交換されて熱風が得られ、この熱風が図３の矢印Ｈ、Ｉに示すように熱風取り出し口１１ｂ、入口２４ｂ、出口２５を介して図３の矢印Ｊに示すように熱風管２６に送られる。また燃焼室１ｂのバーナ２ｂが燃焼しているときは燃焼室１ａのバーナ２ａが消火されており、燃焼室１ｂで燃焼した燃焼ガスが蓄熱体３を通ることで蓄熱体３に熱が与えられ、この燃焼ガスの排気が給排気口１０ｂ，２１ｂを介して排気口２２から大気中に排出され、一方、空気送風管１７から送風される空気は給気口２０、給排気口１０ａ，２１ａを介して燃焼室１ａに供給され、この空気が燃焼室１ａの蓄熱体３を通って蓄熱体３と熱交換されて熱風が得られ、この熱風が熱風取り出し口１１ａ、入口２４ａ、出口２５を介して熱風管２６に送られる。
【００１６】
上記のように構成せる熱風発生装置は燃焼室１ａ，１ｂの蓄熱体３に空気を通すことで熱風を発生するため、燃焼ガスで空気を間接的に加熱して熱風を得るものでも従来にように熱交換器を要せず、装置を大幅に小型化でき、また蓄熱体３に空気を直接通して加熱するために熱効率を向上できる。
【００１７】
上記の例の熱風発生装置では、熱風温度は１サイクル中に燃焼室１ａ，１ｂ内の蓄熱体３が冷却されて行くのに伴い徐々に送る熱風の温度が下がるおそれがある。これが問題となる場合、図４に示すように熱風を送る熱風管２６に別の蓄熱体３０を設けることにより熱風の温度の変動巾を抑えることができる。つまり、熱風管２６に蓄熱体３０を設けない場合、図５の符号ａに示す線のように熱風の温度が変動するが、蓄熱体３０を設けることで図５の符号ｂに示す線のように変動巾を小さくして熱風の温度を均一にできる。但し、この熱風管２６の蓄熱体３０は燃焼室１ａ，１ｂ内の蓄熱体３に比べて耐熱温度を低くしてもよい反面、圧力損失の小さいものが適しており、この蓄熱体３０としてはスチールウール、メタルハニカム、セラミックハニカム等が使用できる。
【００１８】
【発明の効果】
本発明の請求項１の発明は一対の燃焼室に夫々バーナを備えると共に各燃焼室にバーナの燃焼ガスの熱を蓄熱する蓄熱体を備え、一対のバーナが交互に燃焼するようにした燃焼装置において、各燃焼室に給排気口と熱風取り出し口とを夫々設け、バーナが燃焼している一方の燃焼室では燃焼ガスが蓄熱体を通って蓄熱体に蓄熱して給排気口から外部に排気されるようにすると共にバーナが燃焼していない他方の燃焼室では給排気口から給気した空気を導入して蓄熱体で熱交換して得られる熱風を熱風取り出し口から取り出すようにしたので、バーナを交互に燃焼させるときバーナが燃焼している一方の燃焼室では燃料ガスが蓄熱体を通って蓄熱体に蓄熱して給排気口から外部に排気され、バーナが燃焼していない他方の燃焼室では給排気口から給気した空気が燃焼室に導入され、この空気が蓄熱体と熱交換して熱風が得られてこの熱風が熱風取り出し口から取り出されるものであって、燃焼室の蓄熱体を空気が直接通ることで燃焼ガスと間接的に熱交換した熱風が得られ、従来のように別途の熱交換器を要せず、装置を小型化できると共に熱効率を向上できるものである。
【００１９】
また本発明の請求項２の発明は、請求項１において、熱風取り出し口から取り出された熱風を通す熱風管にも蓄熱体を設けたので、熱風管を介して供給する熱風の温度を蓄熱体にて均一にでき、均一な温度の熱風を供給できるものである。
【図面の簡単な説明】
【図１】本発明の熱風発生装置の一例を示す管路図である。
【図２】同上の熱風発生装置の外観の概略を示し、（ａ）は正面図、（ｂ）は側面図であある。
【図３】同上の熱風発生装置の動作を示す概略分解斜視図である。
【図４】同上の熱風発生装置の他の例を示す管路図である。
【図５】同上の作用を示すグラフである。
【図６】従来例を説明する断面図である。
【符号の説明】
１ａ，１ｂ　燃焼室
２ａ，２ｂ　バーナ
３　蓄熱体
１０ａ，１０ｂ　給排気口
１１ａ，１１ｂ　熱風取り出し口[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot air generator for generating hot air to be supplied for drying or the like.
[0002]
[Prior art]
Generally, heat is obtained by burning fuel gas to generate hot air. At this time, it is most efficient to supply the combustion gas as hot air as it is, but the combustion gas contains combustion product water (steam), carbon dioxide (CO ₂ ), and nitrogen oxides (NO _X ). May adversely affect the material to be dried. Therefore, a heat exchanger is arranged at a portion where combustion takes place, air is supplied to a heat exchanger separated from combustion gas, and the air is heated by the heat exchanger to generate hot air.
[0003]
As shown in FIG. 6, there is a hot-air generating device that exchanges heat between combustion gas and air in a heat exchanger to obtain hot air and thereby achieve high thermal efficiency (for example, see Patent Document 1). In this embodiment, a pair of combustion chambers 1a and 1b are arranged side by side. Each combustion chamber 1a and 1b is provided with a burner 2a and 2b, respectively, and each burner 2a and 2b is provided with a heat storage body 3. A fuel supply pipe 4 is connected to each of the burners 2a and 2b, and supply and exhaust pipes 5a and 5b are connected to the burners 2a and 2b to supply air from a blower 9 to an air supply pipe 6, an exhaust pipe 7, and a supply and exhaust pipe 5a. 5b, a switching unit 8 such as a four-way switching valve is provided. The pair of burners 2a and 2b are designed to burn alternately. When the burner 2a is burning, air is supplied from the air supply pipe 6 to the burner 2a via the supply / exhaust pipe 5a. Air heated by obtaining heat from the combustion chamber 1a is supplied as combustion air for the burner 2a, and the combustion gas burned in the combustion chamber 1a is stored in the combustion chamber 1b from the exhaust gas by passing through the regenerator 3 of the burner 2a. The air is exhausted to the outside through the supply / exhaust pipe 5b and the exhaust pipe 7. On the other hand, when the burner 2b is burning, air is supplied from the air supply pipe 6 to the burner 2b via the supply / exhaust pipe 5b, and the air heated by obtaining heat from the heat storage body 3 is used as the combustion air of the burner 2b. The combustion gas combusted in the combustion chamber 1b passes through the regenerator 3 of the burner 2b from the combustion chamber 1a, and heat is stored from the exhaust gas. The exhaust gas is exhausted to the outside through the supply / exhaust pipe 5a and the exhaust pipe 7. . A heat exchanger 31 is arranged in each of the combustion chambers 1a and 1b. When air is passed through the heat exchanger 31, heat is exchanged in the heat exchanger 31 to obtain hot air.
[0004]
[Patent Document 1]
JP-A-10-111087
[Problems to be solved by the invention]
In the above-mentioned conventional example, the heat of the exhaust gas is recovered by the heat storage body and the combustion air is heated to burn the combustion air, so that the combustion efficiency is high. However, the heat exchanger 31 is installed in the combustion chambers 1a and 1b. Heat is generated by exchanging heat by passing air through the heat exchanger 31 and the heat exchanger 31 is arranged. In order to effectively perform heat exchange, the heat exchanger 31 having a large volume must be incorporated. However, there is a problem that the size of the heat exchanger becomes large, and there is a problem that heat exchange efficiency is deteriorated because the heat exchanger 31 indirectly exchanges heat.
[0006]
The present invention has been made in view of the above points, and generates hot air by directly passing air into a combustion chamber to obtain hot air, thereby reducing the size of the apparatus without the need for the separate heat exchanger and improving the efficiency of heat exchange. It is an object to provide a device.
[0007]
[Means for Solving the Problems]
A hot-air generator according to the present invention for solving the above-mentioned problems includes a pair of combustion chambers 1a and 1b respectively provided with burners 2a and 2b, and stores heat of the combustion gas of the burners 2a and 2b in each of the combustion chambers 1a and 1b. In a combustion apparatus provided with a heat storage body 3 in which a pair of burners 2a and 2b alternately burn, supply / exhaust ports 10a and 10b and hot air outlets 11a and 11b are provided in each of the combustion chambers 1a and 1b, respectively. In one combustion chamber 1a (or 1b) where 2a (or 2b) is burning, the combustion gas passes through the heat accumulator 3 and accumulates heat in the heat accumulator 3, and is exhausted to the outside through the supply / exhaust port 10a (or 10b). At the same time, in the other combustion chamber 1b (or 1a) where the burner 2b (or 2a) is not burning, the air supplied from the air supply / exhaust port 10b (or 10a) is introduced to exchange heat with the heat storage body 3. Wherein the hot air that is they were taken out from the hot air outlet 11b (or 11a).
[0008]
With the above-described configuration, when the burner 2a is burning, the combustion gas in the combustion chamber 1a stores heat through the heat storage body 3 and is exhausted from the supply / exhaust port 10a. Air is supplied to the chamber 1b, and hot air obtained by heat exchange by passing through the regenerator 3 in the combustion chamber 1b is taken out from the hot air outlet 11b. Further, when the burner 2b is burning, the combustion gas in the combustion chamber 1b is stored in the heat storage body 3 to be stored and exhausted from the supply / exhaust port 10b, while air is supplied from the supply / exhaust port 10a to the combustion chamber 1a. The hot air obtained by heat exchange by passing through the heat storage body 3 in the combustion chamber 1a is taken out from the hot air outlet 11a. As a result, hot air that has indirectly exchanged heat with the combustion gas can be obtained by direct passage of air through the heat storage bodies 3 of the combustion chambers 1a and 1b, so that a separate heat exchanger is not required and the apparatus can be downsized. And thermal efficiency can be improved.
[0009]
It is also preferable that the heat storage body 30 is provided in the hot air pipe 26 through which the hot air taken out from the hot air outlets 11a and 11b passes. In this case, the temperature of the hot air supplied through the hot air tube 26 can be made uniform by the heat storage body 30, and the hot air having a uniform temperature can be supplied.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
One housing 12 is provided with a pair of combustion chambers 1a and 1b arranged side by side, and burners 2a and 2b are mounted on the upper portions of the combustion chambers 1a and 1b, respectively. The lower part is loaded with a heat storage body 3 having air permeability such as alumina balls. Supply / exhaust ports 10a and 10b are provided in the lower part of the combustion chambers 1a and 1b, and hot air outlets 11a and 11b are provided in the upper parts of the combustion chambers 1a and 1b.
[0011]
The fuel supply pipe 13 for supplying the fuel gas is branched into two branch pipes 13a and 13b, and the respective branch pipes 13a and 13b are connected to burners 2a and 2b, respectively. Opening / closing valves 14a and 14b for opening and closing these pipes and flow regulating valves 15a and 15b are arranged in each of the branch pipes 13a and 13b. Air is blown from a blower 16 that takes in air from the atmosphere and blows the air through an air blower pipe 17. A pair of combustion air supply pipes 18 a and 18 b are connected to the air blower pipe 17. A pair of combustion air supply pipes 18a and 18b are connected to burners 2a and 2b, respectively.
[0012]
A low-temperature side switching unit 19 having a four-way switching valve structure is provided on the lower front surface of the housing 12, and switches communication between an air supply port 20 and a pair of air supply / exhaust ports 21 a and 21 b and an exhaust port 22 which are four ports. It is supposed to do. The supply / exhaust port 21a of the low temperature side switching unit 19 and the supply / exhaust port 10a of the combustion chamber 1a communicate with each other, and the supply / exhaust port 21b of the low temperature side switching unit 19 and the supply / exhaust port 10b of the combustion chamber 1b communicate with each other. In addition, the air supply port 20 of the low-temperature side switching unit 19 communicates with the air blower pipe 17, and the exhaust port 22 is open to the atmosphere.
[0013]
A high-temperature side switching unit 23 having a three-way switching valve structure is provided on the front surface of the upper part of the housing 12 so as to switch communication between a pair of inlets 24a and 24b, which are three ports, and an outlet 25. The inlet 24a of the high-temperature side switching unit 23 communicates with the hot air outlet 11a of the combustion chamber 1a, and the inlet 24b of the high temperature side switching unit 23 communicates with the hot air outlet 11b of the combustion chamber 1a. A hot air tube 26 is led out from an outlet 25 of the high temperature side switching unit 23 and is connected to a foundry sand regenerating device 27 as an example of equipment utilizing hot air. The sand can be dried.
[0014]
The hot air tube 26 is provided with a temperature detecting unit 28, and the temperature detected by the temperature detecting unit 28 is input to the control unit 29, and the opening and closing time of the on-off valves 14a and 14b is controlled so that the temperature of the hot air becomes constant. It is supposed to be.
[0015]
The hot air generator is configured as described above, and the burners 2a, 2b are alternately burned in the respective combustion chambers 1a, 1b. When the burners 2a, 2b burn, the heat storage material of each of the combustion chambers 1a, 1b is burned. 3 can store heat. When the burner 2a burns, fuel gas is supplied from the combustion supply pipe 13 to the burners 2a, 2b via the branch pipes 13a, 13b, and from the blower 16 via the air blower pipe 17, and the combustion air supply pipes 18a, 18b. Thus, combustion air is supplied to the burners 2a and 2b. When the burner 2a of the combustion chamber 1a is burning, the burner 2b of the combustion chamber 1b is extinguished, and the combustion gas burned in the combustion chamber 1a passes through the regenerator 3 as shown by an arrow A in FIG. Heat is applied to the regenerator 3, and the exhaust of the combustion gas is exhausted from the exhaust port 22 to the atmosphere through the supply / exhaust ports 10a and 21a as shown by arrows B and C in FIG. The air blown from 17 is supplied to the combustion chamber 1b through the air supply port 20 and the air supply / exhaust ports 10b and 21b as shown by arrows D, E and F, and this air is supplied as shown by arrow G in FIG. Heat is exchanged with the regenerator 3 through the regenerator 3 of the combustion chamber 1b to obtain hot air, and the hot air passes through the hot air outlet 11b, the inlet 24b, and the outlet 25 as shown by arrows H and I in FIG. As shown by an arrow J in FIG. When the burner 2b of the combustion chamber 1b is burning, the burner 2a of the combustion chamber 1a is extinguished, and the combustion gas burned in the combustion chamber 1b passes through the regenerator 3 to give heat to the regenerator 3. The exhaust of the combustion gas is exhausted from the exhaust port 22 to the atmosphere through the supply / exhaust ports 10b and 21b, while the air blown from the air blower pipe 17 passes through the intake port 20 and the supply / exhaust ports 10a and 21a. This air is supplied to the combustion chamber 1a through the heat storage body 3 of the combustion chamber 1a and heat exchanged with the heat storage body 3 to obtain hot air. The hot air flows through the hot air outlet 11a, the inlet 24a, and the outlet 25. To the hot air tube 26.
[0016]
Since the hot air generator configured as described above generates hot air by passing air through the heat storage bodies 3 of the combustion chambers 1a and 1b, a device that obtains hot air by indirectly heating air with combustion gas as in the related art is used. A heat exchanger is not required, the size of the apparatus can be greatly reduced, and the heat efficiency can be improved because air is directly passed through the heat storage body 3 to heat it.
[0017]
In the hot air generator of the above-described example, the temperature of the hot air may gradually decrease as the heat storage body 3 in the combustion chambers 1a and 1b is cooled during one cycle. If this poses a problem, as shown in FIG. 4, by providing another heat storage body 30 in the hot air tube 26 for sending hot air, the fluctuation range of the temperature of the hot air can be suppressed. In other words, when the heat storage element 30 is not provided in the hot air tube 26, the temperature of the hot air fluctuates as indicated by the line indicated by reference numeral a in FIG. And the temperature of the hot air can be made uniform. However, the heat storage element 30 of the hot air tube 26 may have a lower heat-resistant temperature than the heat storage element 3 in the combustion chambers 1a and 1b, but has a small pressure loss. Steel wool, metal honeycomb, ceramic honeycomb and the like can be used.
[0018]
【The invention's effect】
According to a first aspect of the present invention, there is provided a combustion apparatus in which a pair of combustion chambers are provided with burners, and each of the combustion chambers is provided with a heat storage element for storing heat of combustion gas of the burners, so that the pair of burners burn alternately. In each of the combustion chambers, a supply / exhaust port and a hot air outlet are provided respectively, and in one combustion chamber where the burner is burning, the combustion gas passes through the regenerator and is stored in the regenerator to be exhausted from the supply / exhaust port to the outside. In the other combustion chamber where the burner is not burning, the air supplied from the air supply / exhaust port is introduced, and the hot air obtained by heat exchange with the heat storage body is taken out from the hot air outlet. When the burners are alternately burned, in one combustion chamber in which the burners are burning, the fuel gas passes through the regenerator and is stored in the regenerator, exhausted from the supply / exhaust port to the outside, and the other combustion where the burner is not burning Is it a supply and exhaust port in the room The supplied air is introduced into the combustion chamber, and the air exchanges heat with the heat storage body to obtain hot air, which is taken out from the hot air outlet, and the air passes directly through the heat storage body in the combustion chamber. As a result, hot air indirectly exchanging heat with the combustion gas is obtained, so that a separate heat exchanger is not required as in the related art, so that the apparatus can be downsized and the thermal efficiency can be improved.
[0019]
According to a second aspect of the present invention, in the first aspect, a heat storage element is also provided in the hot air pipe through which the hot air taken out from the hot air outlet is passed, so that the temperature of the hot air supplied through the hot air pipe is stored in the heat storage element. And can supply hot air at a uniform temperature.
[Brief description of the drawings]
FIG. 1 is a pipeline diagram showing an example of a hot air generator of the present invention.
FIGS. 2A and 2B schematically show the appearance of the hot-air generator of the above, wherein FIG. 2A is a front view and FIG. 2B is a side view.
FIG. 3 is a schematic exploded perspective view showing the operation of the above hot air generator.
FIG. 4 is a pipeline diagram showing another example of the above hot air generator.
FIG. 5 is a graph showing the operation of the above.
FIG. 6 is a cross-sectional view illustrating a conventional example.
[Explanation of symbols]
1a, 1b Combustion chambers 2a, 2b Burners 3 Heat storage bodies 10a, 10b Supply / exhaust ports 11a, 11b Hot air outlet

Claims

In a combustion apparatus provided with a burner in each of a pair of combustion chambers and a heat storage body for storing heat of the combustion gas of the burner in each combustion chamber, the pair of burners burn alternately. And a hot air outlet, respectively, so that in one combustion chamber where the burner is burning, the combustion gas passes through the heat accumulator and accumulates in the heat accumulator so that it is exhausted from the supply / exhaust port and the burner burns. A hot air generator, wherein air supplied from an air supply / exhaust port is introduced into the other combustion chamber, and hot air obtained by heat exchange with a heat storage body is taken out from a hot air outlet.

2. The hot air generator according to claim 1, wherein a heat storage body is also provided in a hot air pipe through which the hot air taken out from the hot air outlet is passed.