JP2000356401A - Water heater - Google Patents
Water heaterInfo
- Publication number
- JP2000356401A JP2000356401A JP11166464A JP16646499A JP2000356401A JP 2000356401 A JP2000356401 A JP 2000356401A JP 11166464 A JP11166464 A JP 11166464A JP 16646499 A JP16646499 A JP 16646499A JP 2000356401 A JP2000356401 A JP 2000356401A
- Authority
- JP
- Japan
- Prior art keywords
- water
- heat exchanger
- combustion
- burner
- exhaust gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼熱により通水を加
熱する熱交換器を備えた給湯器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater provided with a heat exchanger for heating water flow by combustion heat.
【０００２】[0002]
【従来の技術】従来から給湯器は、給水管および出湯管
が接続される熱交換器と、この熱交換器を加熱するバー
ナと、バーナに燃焼用空気を供給するファンとを備え、
バーナの燃焼により熱交換器で通水を加熱し、出湯管よ
り出湯する強制燃焼式給湯器が一般的に知られている。2. Description of the Related Art Conventionally, a water heater has a heat exchanger to which a water supply pipe and a tapping pipe are connected, a burner for heating the heat exchanger, and a fan for supplying combustion air to the burner.
2. Description of the Related Art There is generally known a forced combustion type water heater in which water is heated by a heat exchanger by combustion of a burner, and the hot water is supplied from a hot water pipe.
【０００３】バーナの燃焼時に発生する窒素酸化物（Ｎ
Ｏｘ）は有害であるため、室内排気の場合には人体に直
接悪影響を及ぼし、また室外排気の場合には大気汚染に
なり、その除去が望まれている。そこで、実公平２−２
７３０６では、バーナ内のガスと空気との混合気に水蒸
気を付加混入する構造により、燃焼温度を低下させ窒素
酸化物の発生を抑えると共に、燃焼時に水蒸気中に含ま
れる水素により窒素酸化物を還元して燃焼排気から除去
することが知られている。[0003] Nitrogen oxides (N
Since Ox) is harmful, indoor exhaust directly affects the human body, and outdoor exhaust causes air pollution, and its removal is desired. Therefore, actual fairness 2-2
In 7306, the structure in which steam is added to the mixture of gas and air in the burner reduces the combustion temperature to suppress the generation of nitrogen oxides, and reduces nitrogen oxides by the hydrogen contained in the steam during combustion. It is known to remove from combustion exhaust.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この構
造では混合気の燃焼温度が下がるため、完全燃焼せずに
一酸化炭素が発生して燃焼性能を損なう恐れがあった。
そこで、本発明の給湯器は上記課題を解決し、燃焼性能
を低下させずに燃焼排気中の窒素酸化物を除去すること
を目的とする。However, in this structure, since the combustion temperature of the air-fuel mixture is lowered, there is a risk that carbon monoxide is generated without complete combustion and the combustion performance is impaired.
Then, a water heater of the present invention solves the above-mentioned subject, and aims at removing nitrogen oxides in combustion exhaust without lowering combustion performance.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決する本発
明の請求項１記載の給湯器は、バーナの燃焼熱により通
水を加熱する熱交換器と、上記バーナからの燃焼排気が
上記熱交換器を介して器体外部へ流出する排気経路とを
備えた給湯器において、上記排気経路に燃焼排気中の窒
素酸化物を水に溶解させる溶解手段を設けたことを要旨
とする。According to a first aspect of the present invention, there is provided a water heater which heats water by combustion heat of a burner, and wherein the combustion exhaust gas from the burner generates the heat. In a water heater provided with an exhaust path flowing out of a body through an exchanger, a gist is provided in the exhaust path with a dissolving means for dissolving nitrogen oxides in the combustion exhaust gas in water.
【０００６】また、上記課題を解決する本発明の請求項
２記載の給湯器は、請求項１記載の給湯器において、上
記排気経路において上記熱交換器の上流側に上記溶解手
段として燃焼排気に向けて水を噴出する水噴出手段を設
けたことを要旨とする。According to a second aspect of the present invention, there is provided a water heater according to the first aspect of the present invention, wherein the combustion path is provided as the melting means upstream of the heat exchanger in the exhaust path. The gist of the invention is to provide water jetting means for jetting water toward.
【０００７】また、上記課題を解決する本発明の請求項
３記載の給湯器は、請求項１または２記載の給湯器にお
いて、上記排気経路において上記熱交換器の下流側に上
記溶解手段として燃焼排気を水と接触させる水接触手段
を設けたことを要旨とする。According to a third aspect of the present invention, there is provided a water heater according to the first or second aspect of the present invention, in which the exhaust path is provided downstream of the heat exchanger as the melting means. The gist of the present invention is to provide a water contact means for bringing exhaust gas into contact with water.
【０００８】また、上記課題を解決する本発明の請求項
４記載の給湯器は、請求項１ないし３の何れかに記載の
給湯器において、上記溶解手段により上記窒素酸化物を
溶解した溶解水と、上記熱交換器で発生するドレンとを
排出する排水経路を設け、上記排水経路を流れる水の中
和を行う中和手段を備えたことを要旨とする。According to a fourth aspect of the present invention, there is provided a water heater according to any one of the first to third aspects, wherein the nitrogen oxide is dissolved by the dissolving means. And a drain path for discharging the drain generated in the heat exchanger, and a neutralizing means for neutralizing water flowing through the drain path.
【０００９】上記構成を有する本発明の請求項１記載の
給湯器は、バーナの燃焼熱により熱交換器を加熱し、熱
交換器に伝導された熱により通水を加熱する。燃焼排気
中の窒素酸化物は、溶解手段により水に溶解し燃焼排気
から除去される。窒素酸化物が除去された燃焼排気は、
排気経路を通って器体外部へ流出する。In the water heater according to the first aspect of the present invention having the above structure, the heat exchanger is heated by the combustion heat of the burner, and the water is heated by the heat conducted to the heat exchanger. Nitrogen oxides in the combustion exhaust are dissolved in water by the dissolving means and removed from the combustion exhaust. The combustion exhaust from which nitrogen oxides have been removed
It flows out of the body through the exhaust path.
【００１０】また、上記構成を有する本発明の請求項２
記載の給湯器は、燃焼排気中に含まれる窒素酸化物を熱
交換器の上流側で水噴出手段により噴出された水に溶解
させて燃焼排気から除去する。水を噴出することにより
燃焼排気との接触面積が大きくなって多くの窒素酸化物
を溶解することができる。燃焼排気中の水蒸気が熱交換
器表面で酸性ドレンになる場合には、噴出され燃焼熱に
より気化した水は、熱交換器表面で液体になってこの酸
性ドレンを希釈することができるため、熱交換器の耐久
性を向上することができる。しかも一旦気化した水が熱
交換器で凝縮するため、潜熱の回収が可能になり熱効率
を向上することができる。[0010] Further, the present invention has the above-mentioned structure.
The water heater described above dissolves nitrogen oxides contained in the combustion exhaust gas into the water jetted by the water jetting means upstream of the heat exchanger and removes the nitrogen oxides from the combustion exhaust gas. By jetting water, the contact area with the combustion exhaust gas is increased, and a large amount of nitrogen oxide can be dissolved. When the water vapor in the combustion exhaust becomes an acidic drain on the heat exchanger surface, the water that has been ejected and vaporized by the combustion heat becomes a liquid on the heat exchanger surface and can dilute the acidic drain. The durability of the exchanger can be improved. Moreover, once vaporized water is condensed in the heat exchanger, latent heat can be recovered and thermal efficiency can be improved.
【００１１】また、上記構成を有する本発明の請求項３
記載の給湯器は、水接触手段を熱交換器の下流側に設け
たため、バーナでの燃焼温度を特に低下させないで済
み、完全燃焼が行われ一酸化炭素を発生させることな
く、燃焼排気中の窒素酸化物を水接触手段により大量の
水と接触させることができ、非常に多くの窒素酸化物を
溶解させて除去することができる。また、燃焼排気は熱
交換を終えて低温になってから水接触手段へ到達するた
め、窒素酸化物の水への溶解度が大きくなり、窒素酸化
物を確実に除去する。Further, the present invention has the above-mentioned structure.
In the water heater described, since the water contact means is provided downstream of the heat exchanger, the combustion temperature in the burner does not need to be particularly lowered, and complete combustion is performed without generating carbon monoxide. The nitrogen oxides can be brought into contact with a large amount of water by the water contact means, and a very large amount of the nitrogen oxides can be dissolved and removed. Further, since the combustion exhaust gas reaches a water contacting means after the heat exchange has been completed and has a low temperature, the solubility of nitrogen oxides in water increases, and the nitrogen oxides are reliably removed.
【００１２】また、上記構成を有する本発明の請求項４
記載の給湯器は、窒素酸化物を溶解した溶解水と、熱交
換器で発生する酸性ドレンとを排水経路に流し、中和手
段により中和する。この結果、排水は安全な中性とな
る。また、中和手段と溶解手段とを兼用させれば、窒素
酸化物の溶解とその酸性溶液の中和とを同時に行うこと
もできる。Further, the present invention has the above-mentioned structure.
In the water heater described, dissolved water in which nitrogen oxides are dissolved and acid drain generated in the heat exchanger are passed through a drain passage, and neutralized by a neutralizing means. As a result, the wastewater becomes safe neutral. Further, if the neutralizing means and the dissolving means are also used, the dissolution of the nitrogen oxide and the neutralization of the acidic solution thereof can be performed simultaneously.
【００１３】[0013]
【発明の実施形態】以上説明した本発明の構成・作用を
一層明らかにするために、以下本発明の給湯器の好適な
実施形態を説明する。本実施形態のガス給湯器は、図１
に示すように、器具本体１２内の下方位置に、給水管１
４と出湯管１６とが配設される熱交換器１８が燃焼室２
０内に装着された状態で設けられる。熱交換器１８の上
方には、熱交換器１８を加熱するバーナ２２がそのバー
ナ炎孔側を下向きにして取付板２４を介して設けられ
る。器具本体１２には、外気を燃焼用空気として取り込
むための給気口３０と、給気口３０より上方に排気口４
４とが開口される。BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a water heater according to the present invention will be described below. The gas water heater of the present embodiment is shown in FIG.
As shown in FIG.
4 and the tapping pipe 16 are disposed in the heat exchanger 18 in the combustion chamber 2.
0. Above the heat exchanger 18, a burner 22 for heating the heat exchanger 18 is provided via a mounting plate 24 with the burner flame hole side facing downward. The appliance body 12 has an air supply port 30 for taking in outside air as combustion air, and an exhaust port 4 above the air supply port 30.
4 are opened.
【００１４】一方、熱交換器１８を支持する燃焼室２０
の下端には、バーナ２２の燃焼排気により熱交換器１８
を加熱した後の燃焼排気を排出する排気フード３２が設
けられる。この排気フード３２は上方に大きく開口した
椀形状をなし、その下方には石灰石４６を水に浸して収
納する中和室４０が設けられる。排気フード３２の底部
には、連通管３５が接続され、連通管３５の下開口３５
ａが中和室４０の底面に臨むように設けられる。On the other hand, a combustion chamber 20 supporting the heat exchanger 18
At the lower end of the heat exchanger 18 by the combustion exhaust gas of the burner 22.
An exhaust hood 32 that discharges combustion exhaust after heating is provided. The exhaust hood 32 has a bowl shape with a large opening upward, and below the exhaust hood 32 is provided a neutralization chamber 40 for accommodating limestone 46 in water. A communication pipe 35 is connected to the bottom of the exhaust hood 32.
a is provided so as to face the bottom surface of the neutralization chamber 40.
【００１５】尚、この排気フード３２は燃焼排気中のド
レンの受け皿としてのドレンパンを兼ね備えている。中
和室４０の側面には、下開口３５ａより上方に排水管４
１が連結され、更にその上方に排気管３４が連結され
る。排気管３４の上端開口は排気口４４に臨む。The exhaust hood 32 also has a drain pan as a tray for drain in combustion exhaust. On the side surface of the neutralization chamber 40, the drain pipe 4 is located above the lower opening 35a.
1, and an exhaust pipe 34 is further connected thereabove. The upper end opening of the exhaust pipe 34 faces the exhaust port 44.
【００１６】また、熱交換器１８には、燃焼熱を吸収を
するフィン１８ｂに伝熱管１８ａが貫通し複数段蛇行し
て設けられる。この伝熱管１８ａは、熱交換器１８の下
段に設けられる給水管１４と接続し燃焼室２０を巻回し
てバーナ２２の近傍で出湯管１６と接続する。バーナ２
２を覆うバーナカバー２６上のファン取付台３８には、
給気ファン３６を取付ける。この給気ファン３６にはＤ
Ｃモータ４８が連結される。給水管１４には水流センサ
や水ガバナを備える水側制御ユニット５０が設けられ、
またバーナ２２へのガス管５２には主電磁弁５４及びガ
ス比例弁５６が設けられる。The heat exchanger 18 is provided with heat transfer tubes 18a penetrating through fins 18b for absorbing combustion heat and meandering in a plurality of stages. The heat transfer pipe 18 a is connected to a water supply pipe 14 provided at a lower stage of the heat exchanger 18, is wound around the combustion chamber 20, and is connected to the tapping pipe 16 near the burner 22. Burner 2
The fan mounting base 38 on the burner cover 26 covering the
Attach the air supply fan 36. This air supply fan 36 has D
The C motor 48 is connected. The water supply pipe 14 is provided with a water side control unit 50 including a water flow sensor and a water governor,
The gas pipe 52 to the burner 22 is provided with a main solenoid valve 54 and a gas proportional valve 56.
【００１７】熱交換器１８とバーナ２２との間で熱交換
器１８近傍には、上ノズル４２（水噴出手段）が、その
先端を燃焼室２０の左右壁面に貫通し対向して設けられ
る。この上ノズル４２は、バーナ２２の火炎に霧状の噴
出水が触れない位置に配置され、水側制御ユニット５０
から分岐した噴出管４７が接続され、その噴出管４７の
途中には水電磁弁５３が設けられる。In the vicinity of the heat exchanger 18 between the heat exchanger 18 and the burner 22, an upper nozzle 42 (water jetting means) is provided so as to face the left and right wall surfaces of the combustion chamber 20 so as to face each other. The upper nozzle 42 is disposed at a position where the mist of the jet water does not come into contact with the flame of the burner 22.
An ejection pipe 47 branching from is connected, and a water solenoid valve 53 is provided in the middle of the ejection pipe 47.
【００１８】一方、熱交換器１８近傍には、下ノズル４
３（水接触手段）が、その先端を排気フード３２の左右
壁面に貫通し対向して設けられ、噴出管４７と接続す
る。また、給水管１４に設けられる水側制御ユニット５
０内の水流センサや、バーナ２２のガス管５２に設けら
れる主電磁弁５４及びガス比例弁５６、並びに水電磁弁
５３、ＤＣモータ４８等は、このガス給湯器１０の燃焼
を制御するバーナコントローラー５８に電気的に接続さ
れている。On the other hand, near the heat exchanger 18, the lower nozzle 4
3 (water contact means) is provided to face the left and right wall surfaces of the exhaust hood 32 so as to face each other, and is connected to the ejection pipe 47. The water-side control unit 5 provided in the water supply pipe 14
0, a main solenoid valve 54 and a gas proportional valve 56 provided in a gas pipe 52 of the burner 22, a water solenoid valve 53, a DC motor 48, etc., are burner controllers for controlling the combustion of the gas water heater 10. 58 is electrically connected.
【００１９】このように構成されたガス給湯器１０で
は、図示しない給湯栓を開くことにより給水管１４に水
（図中破線矢印）が流れ、水流センサからの検知信号に
よりバーナコントローラー５８が制御動作を行い、給気
ファン３６がＤＣモータ４８の駆動により回転し始め
る。所定のプリパージが完了すると、バーナ２２の主電
磁弁５４及びガス比例弁５６が開いてバーナ２２にガス
（図中実線矢印）が供給され、図示しないイグナイタに
よりバーナ２２に点火が行われる。In the gas water heater 10 configured as described above, water (dashed arrow in the figure) flows through the water supply pipe 14 by opening a hot water tap (not shown), and the burner controller 58 performs a control operation in response to a detection signal from the water flow sensor. Is performed, and the air supply fan 36 starts rotating by the driving of the DC motor 48. When the predetermined prepurge is completed, the main solenoid valve 54 and the gas proportional valve 56 of the burner 22 are opened to supply gas (solid arrow in the drawing) to the burner 22, and the burner 22 is ignited by an igniter (not shown).
【００２０】点火動作が終了すると、比例制御が開始さ
れ、図示しない出湯温サーミスタで検出される湯温と設
定温度との差があると、バーナコントローラー５８でそ
れを判断しガス比例弁５６へ信号を送り、ガス量を連続
的に変化させて熱交換器１８の出口温度を一定に保つ。
またガス比例弁５６によるガス量の変化に応じてバーナ
コントローラー５８から給気ファン３６のＤＣモータ４
８に信号が送られ、給気ファン３６の回転数も変えら
れ、常にガス量と給気量との関係が一定に保たれるよう
に制御される。When the ignition operation is completed, the proportional control is started. If there is a difference between the hot water temperature detected by the hot water temperature thermistor (not shown) and the set temperature, the burner controller 58 determines the difference and sends a signal to the gas proportional valve 56. To keep the outlet temperature of the heat exchanger 18 constant by continuously changing the gas amount.
The burner controller 58 controls the DC motor 4 of the air supply fan 36 in accordance with a change in the gas amount by the gas proportional valve 56.
A signal is sent to 8 and the number of revolutions of the air supply fan 36 is also changed, and control is performed such that the relationship between the gas amount and the air supply amount is always kept constant.
【００２１】このような燃焼制御において、給気ファン
３６の動作に伴い、器具本体１２に設けられる給気口３
０より外気が器具本体１２内に吸引され、バーナ２２へ
導入されて燃焼用空気として燃焼に供される。バーナ２
２の炎口近傍では混合気が燃焼して火炎を形成し、熱交
換器１８の上流側近傍に至る間に燃焼が完結（完全燃
焼）する。バーナ２２の燃焼排気は、給気ファン３６に
より下向きに流れ、熱交換器１８の各フィン１８ｂ間を
貫流して熱交換した後、排気フード３２、連通管３５を
介して中和室４０へ流れる。In such a combustion control, the air supply port 3 provided in the appliance body 12 is operated in accordance with the operation of the air supply fan 36.
From outside, outside air is sucked into the appliance main body 12, introduced into the burner 22, and provided for combustion as combustion air. Burner 2
In the vicinity of the flame outlet 2, the air-fuel mixture burns to form a flame, and the combustion is completed (complete combustion) while reaching the vicinity of the upstream side of the heat exchanger 18. The combustion exhaust gas from the burner 22 flows downward by the air supply fan 36, flows between the fins 18b of the heat exchanger 18 to exchange heat, and then flows to the neutralization chamber 40 via the exhaust hood 32 and the communication pipe 35.
【００２２】燃焼中においては、水電磁弁５３が開き、
細かい霧状の水が上ノズル４２と下ノズル４３とから燃
焼排気に向けて噴出される。燃焼排気中の窒素酸化物
は、上ノズル４２と下ノズル４３とから噴出された水に
溶解して燃焼排気から除去される。霧状に水を噴出する
ことによって燃焼排気との接触面積が大きくなって多く
の窒素酸化物を溶解することができる。During combustion, the water solenoid valve 53 opens,
Fine mist of water is ejected from the upper nozzle 42 and the lower nozzle 43 toward the combustion exhaust gas. Nitrogen oxides in the combustion exhaust are dissolved in the water jetted from the upper nozzle 42 and the lower nozzle 43 and removed from the combustion exhaust. By jetting water in the form of a mist, the contact area with the combustion exhaust gas is increased and a large amount of nitrogen oxides can be dissolved.
【００２３】しかも、上ノズル４２からの水は、窒素酸
化物が生成され易い領域に向けて噴出され、燃焼排気の
熱を奪って水蒸気となることにより、燃焼排気を冷却
し、窒素酸化物の発生自体を抑制する。こうして完全燃
焼後の燃焼排気に水を噴出させるため、バーナ２２での
燃焼温度は低下しないで済み、一酸化炭素が増加するこ
とはない。Further, the water from the upper nozzle 42 is jetted toward a region where nitrogen oxides are easily generated, and takes the heat of the combustion exhaust to form steam, thereby cooling the combustion exhaust and reducing the nitrogen oxides. Suppress the occurrence itself. In this way, water is jetted into the combustion exhaust gas after complete combustion, so that the combustion temperature in the burner 22 does not need to be lowered, and carbon monoxide does not increase.
【００２４】一般的に、燃焼排気中の水蒸気は、熱交換
器１８に冷却されると、露点に達し結露し、燃焼排気中
の硫黄や窒素と反応して酸性ドレン（Ｈ２ＳＯ４、ＨＮ
Ｏ３）になって、熱交換器１８を腐食させてしまう。し
かし、このガス給湯器１０は、酸性ドレンが発生する
時、上ノズル４２から噴出され気化した水も再び液体
（ドレン）になるため、燃焼排気中に残存する窒素酸化
物を溶解しつつ、伝熱管１８ａやフィン１８ｂ表面の酸
性ドレンを希釈することができ、熱交換器１８の腐食を
防止することができる。また、フィン１８ｂとフィン１
８ｂとの間隙での燃焼生成物による詰りが防止され、熱
交換器１８の耐久性が格段に向上する。また、上ノズル
４２から噴出された水は、蒸発する際に燃焼排気の熱を
一旦奪っても、熱交換器１８に接触し冷却されて液体に
戻る。この結果、熱交換器１８は、蒸発潜熱を回収する
ことができ、溶解用に噴出した水により熱を損失するこ
とはなく、非常に高い熱効率を実現できる。また、熱交
換器１８で発生する酸性ドレンは、排気フード３２内に
落下し、バーナ２２の炎孔が酸性ドレンの落下により目
詰まりを起こすこともなく、良好な燃焼状態が維持され
る。Generally, when the steam in the combustion exhaust gas is cooled by the heat exchanger 18, it reaches a dew point and condenses, and reacts with sulfur and nitrogen in the combustion exhaust gas to react with an acidic drain (H 2 SO 4 , HN).
O 3 ) and corrodes the heat exchanger 18. However, when the acid drain is generated, the gas water heater 10 dissolves nitrogen oxide remaining in the combustion exhaust gas while dissolving nitrogen oxides remaining in the combustion exhaust gas, since water spouted from the upper nozzle 42 and vaporized again becomes liquid (drain). The acidic drain on the surfaces of the heat tubes 18a and the fins 18b can be diluted, and the corrosion of the heat exchanger 18 can be prevented. Also, the fin 18b and the fin 1
Clogging with the combustion products in the gap with the gap 8b is prevented, and the durability of the heat exchanger 18 is significantly improved. Further, even if the water ejected from the upper nozzle 42 once takes the heat of the combustion exhaust when evaporating, the water comes into contact with the heat exchanger 18 and is cooled to return to a liquid. As a result, the heat exchanger 18 can recover the latent heat of vaporization, does not lose heat due to the water jetted for dissolution, and can achieve extremely high thermal efficiency. Further, the acidic drain generated in the heat exchanger 18 falls into the exhaust hood 32, and the flame hole of the burner 22 does not become clogged due to the fall of the acidic drain, and a favorable combustion state is maintained.
【００２５】一般的に、気体の溶解度は低温ほど大き
い。熱交換器１８で熱交換を終えた燃焼排気の温度は低
下しているため、燃焼排気中に残存する窒素酸化物は、
下ノズル４３からの水に一層溶解し、燃焼排気から除去
される。また、下ノズル４３を熱交換器１８の下流側に
設けたため、燃焼性能に悪影響を与えることなく、大量
の水を燃焼排気に接触させることができ、多くの窒素酸
化物を溶解させて除去することができる。In general, the solubility of a gas increases as the temperature decreases. Since the temperature of the combustion exhaust gas which has completed the heat exchange in the heat exchanger 18 has decreased, the nitrogen oxides remaining in the combustion exhaust gas are:
It is more soluble in the water from the lower nozzle 43 and is removed from the combustion exhaust. Further, since the lower nozzle 43 is provided on the downstream side of the heat exchanger 18, a large amount of water can be brought into contact with the combustion exhaust without adversely affecting the combustion performance, and a large amount of nitrogen oxide is dissolved and removed. be able to.
【００２６】この溶解水と希釈された酸性ドレンとが混
合した酸性溶液は、燃焼排気と共に連通管３５を通って
水の溜まった中和室４０に導入される。燃焼排気は、気
泡となり水と接触して、排気中に残っている窒素酸化物
が溶解・除去され、排気管３４を介して排気口４４から
器具の外へ排出される。また中和室４０内の石灰石４６
により酸性溶液は中和されるため、排水管４１からは中
性の水が排出されて安全性を高める。The acidic solution in which the dissolved water and the diluted acidic drain are mixed together with the combustion exhaust gas is introduced into the neutralization chamber 40 where water is accumulated through the communication pipe 35. The combustion exhaust gas becomes bubbles and comes into contact with water, so that nitrogen oxides remaining in the exhaust gas are dissolved and removed, and discharged from the exhaust port 44 through the exhaust pipe 34 to the outside of the appliance. Limestone 46 in the neutralization chamber 40
As a result, the acidic solution is neutralized, so that neutral water is discharged from the drain pipe 41 to enhance safety.
【００２７】以上、本発明の実施形態について説明した
が、本発明はこうした実施形態に何等限定されるもので
はなく、本発明の趣旨を逸脱しない範囲において、種々
なる態様で実施し得ることは勿論である。例えば、熱交
換器１８をバーナ２２の上方に設けて、熱交換器１８下
流の排気経路に溶解手段を備えてもよい。また、熱交換
器１８は、潜熱回収用として伝熱管１８ａの段数を増や
してもよい。また、上ノズル４２、下ノズル４３、中和
室４０を必ずしも全て設ける必要はなく、何れか１つを
設けるだけであっても差し支えない。例えば、中和室４
０のみ設けて溶解と中和とを兼用させて行ってもよい。Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it is needless to say that the present invention can be carried out in various modes without departing from the spirit of the present invention. It is. For example, the heat exchanger 18 may be provided above the burner 22 and the exhaust path downstream of the heat exchanger 18 may be provided with a melting unit. In the heat exchanger 18, the number of stages of the heat transfer tubes 18a may be increased for latent heat recovery. Further, it is not always necessary to provide all of the upper nozzle 42, the lower nozzle 43, and the neutralization chamber 40, and only one of them may be provided. For example, neutralization room 4
Alternatively, dissolution and neutralization may be performed by providing only 0.
【００２８】また、上ノズル４２は、熱交換器１８の近
傍に設ける必要はないが、設置位置によっては噴出水に
よる燃焼温度の低下により不完全燃焼を引き起こす可能
性があるため、燃焼温度と窒素酸化物の発生領域との関
係を考慮して適切な設置位置を選択すると良い。また、
溶解させる溶媒は、霧状の水に限らず、シャワーのよう
な水滴や容器に溜めた水でもよい。また、熱交換器１８
上で蒸発潜熱の回収をしなくてもよい。この場合には、
燃焼排気中の水蒸気は、熱交換器１８上で高温を保って
気体のままなので、ドレンを発生させず、熱交換器１８
の腐食が防止でき耐久性を向上することができる。The upper nozzle 42 does not need to be provided in the vicinity of the heat exchanger 18. However, depending on the installation position, there is a possibility that incomplete combustion may be caused by a decrease in the combustion temperature due to the jet water. It is preferable to select an appropriate installation position in consideration of the relationship with the oxide generation region. Also,
The solvent to be dissolved is not limited to mist water, but may be water droplets such as a shower or water stored in a container. In addition, the heat exchanger 18
It is not necessary to collect the latent heat of evaporation above. In this case,
Since the water vapor in the combustion exhaust gas remains at a high temperature on the heat exchanger 18 and remains gaseous, no drain is generated, and the heat exchanger 18
Corrosion can be prevented and durability can be improved.
【００２９】[0029]
【発明の効果】以上詳述したように、本発明の請求項１
記載の給湯器によれば、バーナの燃焼性能を低下させる
ことなく、水溶解手段により燃焼排気から窒素酸化物を
除去することができ、人体に悪影響を与えないし、また
大気を汚染しない。As described in detail above, claim 1 of the present invention
According to the water heater described above, the nitrogen oxides can be removed from the combustion exhaust gas by the water dissolving means without lowering the combustion performance of the burner, which does not adversely affect the human body and does not pollute the atmosphere.
【００３０】また、請求項２記載の給湯器によれば、噴
出された水と燃焼排気との接触面積を大きくして多くの
窒素酸化物を溶解し、燃焼排気から除去することができ
る。ドレンが発生する場合においては、噴出に使用した
水によりドレンを希釈して洗い流すことができるため、
熱交換器の耐久性を向上することができ、しかも潜熱の
回収が可能になり熱効率を向上することができる。According to the water heater of the second aspect, the contact area between the jetted water and the combustion exhaust gas is increased to dissolve and remove a large amount of nitrogen oxides from the combustion exhaust gas. In the case where drainage occurs, the drainage can be diluted and washed away with the water used for jetting,
The durability of the heat exchanger can be improved, and the latent heat can be recovered, so that the heat efficiency can be improved.
【００３１】また、請求項３記載の給湯器によれば、燃
焼性能を低下させることなく、大量の水を燃焼排気に接
触させて、燃焼排気から多くの窒素酸化物を除去するこ
とができる。また、燃焼排気が低温になった後に水を接
触させるため、窒素酸化物の水への溶解度が大きくな
り、窒素酸化物を確実に除去することができる。According to the water heater of the third aspect, a large amount of water can be brought into contact with the combustion exhaust gas without lowering the combustion performance to remove a large amount of nitrogen oxides from the combustion exhaust gas. Further, since the water is brought into contact with the combustion exhaust gas after the temperature becomes low, the solubility of the nitrogen oxide in water increases, and the nitrogen oxide can be reliably removed.
【００３２】また、請求項４記載の給湯器によれば、熱
交換器で発生するドレンを中和手段により中和し、排水
を安全な中性とすることができる。また、中和手段と溶
解手段とを兼用させれば、窒素酸化物の溶解とドレンの
中和とを同時に行うこともできる。According to the fourth aspect of the present invention, the drain generated in the heat exchanger can be neutralized by the neutralizing means, and the waste water can be made neutral. Further, if the neutralizing means and the dissolving means are also used, the dissolving of the nitrogen oxides and the neutralization of the drain can be performed simultaneously.
【図１】強制燃焼式給湯器の概略図である。FIG. 1 is a schematic diagram of a forced combustion water heater.
１８…熱交換器、１８ａ…伝熱管、１８ｂ…フィン、２
０…燃焼室、２２…バーナ、３２…排気フード、３４…
排気管、４０…中和室、４１…排水管、４２…上ノズ
ル、４３…下ノズル、４６…石灰石。18 heat exchanger, 18a heat transfer tube, 18b fin, 2
0: combustion chamber, 22: burner, 32: exhaust hood, 34:
Exhaust pipe, 40: neutralization chamber, 41: drain pipe, 42: upper nozzle, 43: lower nozzle, 46: limestone.
Claims (4)
交換器と、 上記バーナからの燃焼排気が上記熱交換器を介して器体
外部へ流出する排気経路とを備えた給湯器において、 上記排気経路に燃焼排気中の窒素酸化物を水に溶解させ
る溶解手段を設けたことを特徴とする給湯器。1. A water heater comprising: a heat exchanger for heating water flow by combustion heat of a burner; and an exhaust path through which combustion exhaust gas from the burner flows out of the body through the heat exchanger. A water heater comprising a dissolving means for dissolving nitrogen oxides in combustion exhaust gas in water in the exhaust passage.
流側に上記溶解手段として燃焼排気に向けて水を噴出す
る水噴出手段を設けたことを特徴とする請求項１記載の
給湯器。2. The water heater according to claim 1, wherein a water jetting means for jetting water toward the combustion exhaust gas is provided as the melting means upstream of the heat exchanger in the exhaust path.
流側に上記溶解手段として燃焼排気を水と接触させる水
接触手段を設けたことを特徴とする請求項１または２記
載の給湯器。3. The water heater according to claim 1, further comprising a water contacting means for bringing the combustion exhaust gas into contact with water as the dissolving means on the exhaust path downstream of the heat exchanger.
た溶解水と、上記熱交換器で発生するドレンとを排出す
る排水経路を設け、 上記排水経路を流れる水の中和を行う中和手段を備えた
ことを特徴とする請求項１ないし３の何れかに記載の給
湯器。4. A neutralizing means for providing a drainage path for discharging dissolved water in which nitrogen oxide is dissolved by the dissolving means and drain generated in the heat exchanger, and for neutralizing water flowing through the drainage path. The water heater according to any one of claims 1 to 3, further comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11166464A JP2000356401A (en) | 1999-06-14 | 1999-06-14 | Water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11166464A JP2000356401A (en) | 1999-06-14 | 1999-06-14 | Water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000356401A true JP2000356401A (en) | 2000-12-26 |
Family
ID=15831892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11166464A Pending JP2000356401A (en) | 1999-06-14 | 1999-06-14 | Water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000356401A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101040213B1 (en) | 2009-03-14 | 2011-06-09 | 주식회사 대열보일러 | Condensing boiler has scrubber for reducing the carbon and the nitrogen oxide |
| CN104913486A (en) * | 2015-06-09 | 2015-09-16 | 艾欧史密斯(中国)热水器有限公司 | Balance-type gas-fired hot water device |
-
1999
- 1999-06-14 JP JP11166464A patent/JP2000356401A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101040213B1 (en) | 2009-03-14 | 2011-06-09 | 주식회사 대열보일러 | Condensing boiler has scrubber for reducing the carbon and the nitrogen oxide |
| CN104913486A (en) * | 2015-06-09 | 2015-09-16 | 艾欧史密斯(中国)热水器有限公司 | Balance-type gas-fired hot water device |
| WO2016197902A1 (en) * | 2015-06-09 | 2016-12-15 | 艾欧史密斯(中国)热水器有限公司 | Balanced gas water heating device |
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