JP3561412B2 - Combustion device for hot air heater - Google Patents

Description

【００２３】
また、燃焼空気の酸素が欠乏したときなど一次空気が不足し、赤火燃焼になり一酸化炭素の発生が増大するような場合でも二次空気が充分供給されて二次燃焼し一酸化炭素の発生が抑制される。
【００２４】
そして、燃焼排気は機器本体１に取り付けられた対流用送風機９の送風によるドラフト効果により燃焼室３の上部の開口部から燃焼室３の外へ排出され、対流用送風機９によって採り込まれた室内空気と混合された後ルーバーを備えた吹出口６から温風として室内に放出される。
【００２５】
また、図５及び図６の第２の実施の形態に示すように、燃焼用二次空気１７は、燃焼室３の燃焼室後２３の背面下部に位置している二次空気導入部２０より、対流用送風機９からの風が導風板１８に導かれて、導風板１８の二次空気放出部１９より、勢いよく噴出され、燃焼炎と直交して二次燃焼する。
【００２６】
この二次燃焼した燃焼ガスは、酸素量が少なく、図４に点線で示すように導風板１８の二次空気放出部１９より噴出され、燃焼炎と直交して二次燃焼するが、導風板１８の二次空気放出部１９よりの噴出される風の勢いがつよいので、風向板２１に沿って下方に送られ、風向板２１の凸部２６によってバーナ１３近傍部に燃焼ガスが導かれ、二次空気の一部として燃焼するが、一酸化炭素が僅かに高めの燃焼ガスとして上昇して、導風板１８の二次空気放出部１９よりの噴出される風で二次燃焼して一酸化炭素は低減されて、燃焼室３の上部の開口部から燃焼室３の外へ排出され、対流用送風機９によって採り込まれた室内空気と混合された後ルーバーを備えた吹出口６から温風として室内に放出される。
【００２７】
また、導風板１８の二次空気放出部１９がないところは、そのまま二次燃焼した燃焼ガスは、燃焼室３の上部の開口部から燃焼室３の外へ排出され、対流用送風機９によって採り込まれた室内空気と混合された後ルーバーを備えた吹出口６から温風として室内に放出される。このように簡易に燃焼ガスを循環することにより、燃焼ガス中の窒素酸化物の生成がさらに減少する。
【００２８】
表２にその状態、つまり改善前（図８に示す従来の構成）と改善後（図５及び図６に示す本発明の第２の実施の形態の構成）の６．３ＫＷの燃焼装置の窒素酸化物排出量の比較を示す。
【００２９】
なお、表２において、窒素酸化物排出量は、理論最大二酸化炭素濃度によって換算した窒素酸化物を濃度によって表したものである。
【００３０】
【表２】

【００３１】
【発明の効果】
本発明の温風暖房機の燃焼装置は、燃焼部バーナ炎よりの燃焼炎を囲う燃焼室と、バーナを囲うバーナボックスとからなる燃焼囲部を備えた温風暖房機において、対流用送風機からの風を燃焼室の側面の取り入れ口より、燃焼用二次空気として取り入れ、風向板の案内ガイドを介して、燃焼室前と風向板の間に風を通過させ、風向板を冷却することにより、バーナからの燃焼炎温度を低くくなり、窒素酸化物の発生を抑制することができる。
【００３２】
また、燃焼室に燃焼用二次空気として対流用送風機からの風をとりいれ、導風板をへて、この風を二次燃焼用空気として活用し燃焼させた後、酸素の少ない燃焼ガスの一部を風向板に沿って、バーナ炎口部の近傍に送り燃焼用空気として燃焼した後上昇し、導風板から風の二次燃焼用空気で燃焼して一酸化炭素を低減して室内空気と混合して温風となって放出することにより、簡易的に燃焼ガスを循環するので、窒素酸化物の発生が更に押さえることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態に係る石油ファンータの概略構造を示す側面断面図である。
【図２】図１のＡ−Ａ線の上方断面図である。
【図３】図１のＢ矢示方向から見た燃焼室前の斜視図である。
【図４】図１のＣ矢示方向から見た燃焼室後の斜視図である。
【図５】本発明の第２の実施の形態の係る石油ファンータの概略構造を示す側面断面図である。
【図６】図５のＤ矢示方向から見た燃焼室前の斜視図である。
【図７】従来の実施の形態に係る石油ファンヒータの一部切欠正面断面図である。
【図８】図７の側面断面図である。
【図９】図７のバーナ部の要部正面断面図である。
【符号の説明】
１ 機器本体
２ ポンプ
３ 燃焼室
４ バーナボックス
５ 燃焼囲部
６ 吹出口
７ 気化器
８ ノズル
９ 対流用送風機
１０ 燃焼用一次空気
１１ 気化燃料
１２ 給油タンク
１３ バーナ
１４ 仕切板
１５ 油受け皿
１６ バーナ炎口部
１７ 燃焼用二次空気
１８ 導風板
１９ 二次空気放出部
２０ 二次空気導入部
２１ 風向板
２２ 燃焼室前
２３ 燃焼室後
２４ 切り起し穴
２５ 案内ガイド
２６ 凸部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combustion device used for a petroleum gasification type hot air heater such as a petroleum fan heater, for example, and relates to a combustion device capable of reducing the emission of nitrogen oxides and ensuring combustion stability.
[0002]
[Prior art]
A conventional combustion apparatus of this type, for example, an oil fan heater is configured as shown in FIGS. 7, 8 and 9, and FIG. 7 is a partially cutaway front sectional view of the conventional combustion apparatus. FIG. 9 is a side sectional view schematically showing a conventional combustion device, and FIG. 9 is a front sectional view of a main part of a burner portion of the conventional combustion device.
[0003]
First, a combustion section of a petroleum fan heater which is a conventional combustion apparatus will be described with reference to FIGS.
[0004]
7 to 9, a vaporized fuel 11, which is a liquid fuel preheated and vaporized, is injected into a burner 13 from a nozzle 8 of a vaporizer 7, and the primary air 10 required for combustion is ejected by an ejector effect of the fuel gas injection. The required amount is naturally sucked into the burner 13 and mixed therein, and then burns at the burner flame opening 16. The burner 13 is housed in a combustion enclosure 5 formed by the combustion chamber 3 and the burner box 4.
[0005]
The air from the convection blower 9 is guided to the baffle plate 18 from the secondary air introduction part 20 located at the lower rear portion of the back of the combustion chamber 3 of the combustion chamber 3. The fuel is jetted vigorously from the secondary air discharging portion 19 of the fuel cell 18 and mixed orthogonally with the combustion flame. The combustion exhaust is discharged out of the combustion chamber 3 from the upper opening of the combustion chamber 3 by the draft effect of the convection blower 9 attached to the apparatus main body 1 by the draft effect, and the indoor air taken in by the convection blower 9 and After being mixed, the air is discharged into the room as warm air from an outlet 6 provided with a louver.
[0006]
[Problems to be solved by the invention]
In the petroleum fan heater that is the above-described combustion device, a combustion gas that is one of the main causes of generation of nitrogen oxides and hydrocarbons in the air is generated. For this reason, when the oil fan heater is operated indoors, the concentration of nitrogen oxides and hydrocarbons may be extremely high, but no measures have been taken with respect to the removal of nitrogen oxides and hydrocarbons in the room. As for the removal of combustion gas from heaters such as petroleum fan heaters, the industry has set its target for product development at a level of 100 ppm or less of nitrogen oxides compared to the 1998 product. At present, it is determined that the amount of material discharged is 120 ppm or less to improve flammability.
[0007]
In view of the above, an object of the present invention is to provide a combustion device for a hot-air heater that reduces the emission of nitrogen oxides generated from the heater.
[0008]
[Means for Solving the Problems]
A combustion device for a hot air heater according to the present invention has been made in order to solve the above problem, and includes a combustion chamber including a combustion chamber surrounding a combustion flame from a combustion part burner flame, and a burner box surrounding a burner. In the hot air heater, an inlet for taking in air from a convection blower from the side of the combustion chamber as secondary air for combustion is provided.
[0009]
Further, the wind taken in from the intake on the side of the combustion chamber is formed as a wind direction plate, and the wind is passed between the front of the combustion chamber and the wind direction plate.
[0010]
And the wind taken in from the intake into the side of the combustion chamber is made to pass between the front of the combustion chamber and the wind direction plate through the guide for the wind direction plate.
[0011]
Further, a baffle plate is provided in the combustion chamber to take in the wind from the convection blower as secondary air for combustion, and after the wind is subjected to secondary combustion, a part thereof is burned along the combustion chamber side of the wind direction plate. It is guided and burned near the flame outlet.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a case in which an embodiment of a combustion device for a hot air heater according to the present invention is applied to an oil fan heater will be described with reference to FIGS. 1 to 6. A description is given below.
[0013]
1 is a side sectional view showing a schematic structure of an oil fan according to the first embodiment, FIG. 2 is an AA upper sectional view of FIG. 1 showing a schematic structure of the oil fan heater, and FIG. FIG. 4 is a perspective view of the front of the combustion chamber 22 as viewed from the direction of arrow B in FIG. 1, and FIG. 4 is a perspective view of the rear 23 of the combustion chamber as viewed from the direction of arrow C in FIG. 5 is a side sectional view showing a schematic structure of an oil fanter according to the second embodiment, and FIG. 6 is a perspective view of a combustion chamber front 22 of the schematic structure of the oil fanter viewed from a direction indicated by an arrow D in FIG.
[0014]
The combustion chamber 3 of the first embodiment shown in FIGS. 1 to 4 comprises a front part 22 of the combustion chamber and a rear part 23 of the combustion chamber. A secondary air inlet 20 for taking in secondary air is provided on the back side, and a secondary air discharge unit 19 for blowing air to the combustion flame is provided on the air guide plate 18. Is fixed to the rear 23 of the combustion chamber with screws.
[0015]
At the front 22 of the combustion chamber, a wind direction plate 21 formed with a guide guide 25 for guiding secondary air from the cut-and-raised holes 24 on both sides of the rear 23 of the combustion chamber is fixed to the front 22 of the combustion chamber with screws. It has a configuration.
[0016]
In the combustion chamber 3 of the second embodiment shown in FIGS. 5 and 6, a part of the combustion gas obtained by secondary combustion of the secondary air from the baffle plate 18 with the combustion flame is provided to the wind direction plate 21. The projection 26 is formed so as to be guided to the lower burner 13 along the axis. The other configuration is the same schematic structure as the combustion device described in the section of the related art.
[0017]
In the above-described configuration, the vaporized fuel 11 which is preheated and vaporized by the liquid fuel is injected into the burner 13 from the nozzle 8 of the vaporizer 7, and the required amount of the primary air 10 required for combustion by the ejector effect of the fuel gas injection. Is naturally sucked into the burner 13, mixed inside the burner 13, and burns at the burner flame opening 16. The burner 13 is housed in a combustion enclosure 5 formed by the combustion chamber 3 and the burner box 4.
[0018]
In addition, the secondary air for combustion 17 is guided by a convection blower 9 to a baffle plate 18 from a secondary air introduction unit 20 located at the lower rear portion of the rear of the combustion chamber 23 behind the combustion chamber 3. The air is expelled vigorously from the secondary air discharging portion 19 of the wind plate 18 and mixed orthogonally with the combustion flame.
[0019]
On the other hand, the wind of the convection blower 9 is taken in from the cut-and-raised holes 24 on both sides of the rear of the combustion chamber 23 of the combustion chamber 3, flows along the guide 25 of the wind direction plate 21, and flows in front of the combustion chamber of the combustion chamber 3. It is guided between 22 and the wind direction plate 18. This wind cools the wind direction plate 21. Therefore, there is an effect of lowering the combustion temperature of the combustion flame by a synergistic effect of the combustion flame rising along the cooled wind direction plate 18 and the sufficient supply of the secondary air from the air guide plate 18. And the production of nitrogen oxides is reduced.
[0020]
Table 1 shows the state, that is, the nitrogen of the 3.3 KW combustion apparatus before the improvement (the conventional configuration shown in FIG. 8) and after the improvement (the configuration of the first embodiment of the present invention shown in FIGS. 1 to 4). A comparison of oxide emissions is shown.
[0021]
In Table 1, the amount of nitrogen oxide emission is represented by the concentration of nitrogen oxide converted by the theoretical maximum carbon dioxide concentration.
[0022]
[Table 1]

[0023]
In addition, even when the primary air is insufficient, such as when the oxygen in the combustion air is deficient, and the combustion of red fire increases and the generation of carbon monoxide increases, the secondary air is sufficiently supplied and the secondary combustion is performed to reduce the carbon monoxide. Generation is suppressed.
[0024]
Then, the combustion exhaust is discharged from the upper opening of the combustion chamber 3 to the outside of the combustion chamber 3 by a draft effect of the convection blower 9 attached to the apparatus main body 1 and is taken in by the convection blower 9. After being mixed with air, the air is discharged into the room as warm air from an outlet 6 provided with a louver.
[0025]
As shown in the second embodiment in FIGS. 5 and 6, the secondary air for combustion 17 is supplied from the secondary air introduction section 20 located at the lower rear portion of the rear of the combustion chamber 3 behind the combustion chamber 23. Then, the wind from the convection blower 9 is guided to the baffle plate 18, and is vigorously ejected from the secondary air discharge portion 19 of the baffle plate 18, and secondary combustion is performed orthogonally to the combustion flame.
[0026]
The combustion gas after the secondary combustion has a small amount of oxygen and is ejected from the secondary air discharging portion 19 of the baffle plate 18 as shown by a dotted line in FIG. Since the wind blown from the secondary air discharge portion 19 of the wind plate 18 is strong, it is sent downward along the wind direction plate 21, and the combustion gas is guided to the vicinity of the burner 13 by the convex portion 26 of the wind direction plate 21. Then, it burns as a part of the secondary air. However, carbon monoxide rises as a slightly higher combustion gas, and the secondary combustion is performed by the wind blown out from the secondary air discharging portion 19 of the baffle plate 18. The carbon monoxide is reduced, and discharged from the upper opening of the combustion chamber 3 to the outside of the combustion chamber 3, mixed with the room air taken in by the convection blower 9, and then provided with an outlet 6 having a louver. Is released into the room as warm air.
[0027]
Where the secondary air discharge portion 19 of the baffle plate 18 is not provided, the combustion gas which has undergone secondary combustion is discharged out of the combustion chamber 3 through the opening at the upper portion of the combustion chamber 3, and is blown by the convection blower 9. After being mixed with the taken-in room air, it is discharged into the room as warm air from an outlet 6 having a louver. By simply circulating the combustion gas in this way, the generation of nitrogen oxides in the combustion gas is further reduced.
[0028]
Table 2 shows the state, that is, the nitrogen of the 6.3 KW combustion apparatus before the improvement (the conventional configuration shown in FIG. 8) and after the improvement (the configuration of the second embodiment of the present invention shown in FIGS. 5 and 6). A comparison of oxide emissions is shown.
[0029]
In Table 2, the amount of nitrogen oxide emission is represented by the concentration of nitrogen oxide converted by the theoretical maximum carbon dioxide concentration.
[0030]
[Table 2]

[0031]
【The invention's effect】
The combustion device of the hot air heater of the present invention is a hot air heater provided with a combustion chamber including a combustion chamber surrounding a combustion flame from a combustion part burner flame and a burner box surrounding a burner. The wind from the combustion chamber is taken in from the intake on the side of the combustion chamber as secondary air for combustion, and the wind is passed between the front of the combustion chamber and the wind panel through the guide for the wind panel to cool the wind panel. The temperature of the combustion flame from the fuel becomes low, and the generation of nitrogen oxides can be suppressed.
[0032]
In addition, wind from a convection blower is taken into the combustion chamber as secondary air for combustion, and the air is blown through a baffle plate to use the wind as secondary combustion air for combustion. The air is sent along the wind direction plate to the vicinity of the burner flame opening, burns as combustion air, rises, and then burns with the air for secondary combustion of the wind from the baffle plate to reduce carbon monoxide and to reduce indoor air. Since the combustion gas is easily circulated by mixing and discharging as warm air, the generation of nitrogen oxides can be further suppressed.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a schematic structure of a petroleum fanter according to a first embodiment of the present invention.
FIG. 2 is an upper sectional view taken along line AA of FIG. 1;
FIG. 3 is a perspective view in front of a combustion chamber as viewed from a direction indicated by an arrow B in FIG. 1;
FIG. 4 is a perspective view after the combustion chamber as viewed from the direction of arrow C in FIG. 1;
FIG. 5 is a side sectional view showing a schematic structure of an oil fan according to a second embodiment of the present invention.
6 is a perspective view of the front of the combustion chamber as viewed from the direction indicated by arrow D in FIG. 5;
FIG. 7 is a partially cutaway front sectional view of an oil fan heater according to a conventional embodiment.
FIG. 8 is a side sectional view of FIG. 7;
FIG. 9 is a front sectional view of a main part of the burner section of FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Device main body 2 Pump 3 Combustion chamber 4 Burner box 5 Combustion enclosure 6 Outlet 7 Vaporizer 8 Nozzle 9 Convection blower 10 Primary air for combustion 11 Vaporized fuel 12 Refueling tank 13 Burner 14 Partition plate 15 Oil pan 16 Burner flame Part 17 secondary air for combustion 18 air guide plate 19 secondary air discharge part 20 secondary air introduction part 21 wind direction plate 22 front of combustion chamber 23 after combustion chamber 24 cut-out hole 25 guide guide 26 convex part

Claims (4)

A combustion chamber surrounding a combustion flame from a combustion part burner flame, and a warm air heater having a combustion enclosure composed of a burner box surrounding a burner, wherein a wind direction plate is provided inside the combustion chamber front wall portion, A hot air heating system , wherein a guide is provided on the wind direction plate for guiding wind from a convection blower taken in from a side surface of the combustion chamber between the wind direction plate and the combustion chamber front wall portion. Machine combustion equipment. In a warm air heater provided with a combustion enclosure comprising a combustion chamber surrounding a combustion flame from a combustion part burner flame and a burner box surrounding a burner, a wind direction plate is provided inside the combustion chamber front wall portion, On the side of the combustion chamber, an intake is formed by cutting and raising inward to take in the wind from the convection blower, and the wind from the blower taken in from the intake is formed on the wind direction plate by the wind direction plate and the combustion. A combustion device for a warm air heater, wherein a guide is provided to guide the space between the room and the front wall. The hot air heater according to claim 1 or 2, wherein a wind guide plate is provided inside the rear wall portion of the combustion chamber to take in air from the convection blower as secondary air for combustion into the combustion chamber. Combustion equipment. In a warm air heater provided with a combustion enclosure comprising a combustion chamber surrounding a combustion flame from a combustion part burner flame and a burner box surrounding a burner , a combustion chamber for burning the combustion chamber inside the rear wall of the combustion chamber. A baffle plate that takes in wind from a convection blower as secondary air is provided, and a wind direction plate that sends wind from the baffle plate downward is provided inside the combustion chamber front wall portion. And a convex portion for changing the flow of the wind so as to be guided to the vicinity of the burner .

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