JP4669972B2 - Waste cooking oil combustion method and combustion apparatus - Google Patents

Waste cooking oil combustion method and combustion apparatus Download PDF

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JP4669972B2
JP4669972B2 JP2005044924A JP2005044924A JP4669972B2 JP 4669972 B2 JP4669972 B2 JP 4669972B2 JP 2005044924 A JP2005044924 A JP 2005044924A JP 2005044924 A JP2005044924 A JP 2005044924A JP 4669972 B2 JP4669972 B2 JP 4669972B2
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edible oil
waste edible
oil
waste
combustion apparatus
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JP2006234181A (en
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雅之 古山
利彦 金谷
繁朋 松井
修 大隈
雅一 出口
清孝 鳴海
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Kawasaki Thermal Engineering Co Ltd
New Industry Research Organization NIRO
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New Industry Research Organization NIRO
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Description

本発明は、廃食用油の燃焼方法および燃焼装置に関する。さらに詳しくは、廃食用油をＡ重油などと同様に燃焼がなし得る廃食用油の燃焼方法および燃焼装置に関する。   The present invention relates to a combustion method and a combustion apparatus for waste cooking oil. More specifically, the present invention relates to a combustion method and a combustion apparatus for waste edible oil that can burn waste edible oil in the same manner as A heavy oil and the like.

従来より、家庭、料理店、食品製造業者などにおいて各種料理や調理などに食用油が利用され、その利用にともない家庭などから発生する廃食用油は、年間４０万トン〜５０万トンにも上るともいわれている。この廃食用油のほぼ半分は食品製造業者などの業者からのもので、その内大手業者からのものは回収業者により回収され、その７割程度が飼料用に利用され、その残りは溶剤、工業用原料などに再利用されている。   Conventionally, cooking oil has been used for cooking, cooking, etc. in households, restaurants, food manufacturers, etc., and waste cooking oil generated from households, etc. due to its use has reached 400,000 to 500,000 tons per year. It is also said. Almost half of this waste edible oil comes from food manufacturers, etc., of which major ones are collected by collectors, about 70% of which is used for feed, the rest being solvent, industrial It is reused as a raw material.

一方、残りの半分を占める家庭、料理店、小規模食品製造業者などからの廃食用油の大半は、何等の処理もなされることなく下水などに排出されている。そのため、この廃食用油による環境汚染が発生している。   On the other hand, most of the waste cooking oil from households, restaurants, small-scale food manufacturers, etc., accounting for the other half, is discharged into sewage without any treatment. Therefore, environmental pollution by this waste cooking oil has occurred.

この対策として、一部の地方自治体においては、廃食用油の回収を促進するとともに例えば廃食用油からバイオディーゼル油を再合成し、廃食用油の持つエネルギーの有効活用を図ろうとする試みがなされている。しかしながら、その設備が大掛かりなものとなり設備費用がかさむため、全国的な規模で普及するまでには至っていない。また、バイオディーゼル油を軽油に混ぜて使用することも考えられるが、そうすると軽油取引税がかかるため、経済的に成立しなくなる。   As a countermeasure, some local governments have tried to promote the recovery of waste edible oil and re-synthesize biodiesel oil from waste edible oil, for example, to effectively use the energy of waste edible oil. ing. However, since the equipment is large and equipment costs are high, it has not been spread on a nationwide scale. It is also conceivable to use biodiesel oil mixed with light oil, but doing so will result in a light oil transaction tax and will not be economically viable.

しかるに、廃食用油をＡ重油等の燃料油と同様に、ボイラや吸収冷凍機において燃料として利用することができれば、廃食用油の回収が促進されてそれによる環境汚染も解消されるものと期待される。   However, if waste edible oil can be used as fuel in boilers and absorption chillers as well as fuel oil such as A heavy oil, recovery of waste edible oil is expected to be promoted and environmental pollution caused by it will be eliminated. Is done.

しかしながら、廃食用油を汎用の燃焼装置により燃焼させた場合、未燃物が炉壁等の伝熱面に大量に析出・付着し、熱伝達を阻害すると同時に、そのような未燃物の除去、清掃を頻繁に行う必要が生じるといった問題がある。   However, when waste cooking oil is burned by a general-purpose combustion device, a large amount of unburned matter deposits and adheres to the heat transfer surface such as the furnace wall, obstructing heat transfer, and at the same time removing such unburned matter. There is a problem that frequent cleaning is required.

なお、液体状の主燃料と一定量の廃食用油とを予混合させて燃焼させる技術については、特許文献１に提案されている。
特開平１１−２２３３２６号公報 A technique for premixing and burning a liquid main fuel and a certain amount of waste edible oil is proposed in Patent Document 1.
JP-A-11-223326

本発明はかかる従来技術の課題に鑑みなされたものであって、廃食用油をＡ重油と同様に燃焼させることができる廃食用油の燃焼方法および燃焼装置を提供することを目的としている。   This invention is made | formed in view of the subject of this prior art, Comprising: It aims at providing the combustion method and combustion apparatus of waste edible oil which can burn waste edible oil similarly to A heavy oil.

本発明者等は、かかる課題に対し鋭意研究した結果、廃食用油の温度を９０℃〜１１０℃に維持して圧力噴霧式燃焼装置により圧力噴霧を行うと、Ａ重油と同様の噴霧粒子径および粒子径分布が得られ、良好な燃焼がなし得ることを見出し、本発明を完成するに至った。   As a result of diligent research on the above problems, the present inventors have carried out pressure spraying with a pressure spray combustion apparatus while maintaining the temperature of waste edible oil at 90 ° C. to 110 ° C. The inventors have found that a particle size distribution can be obtained and good combustion can be achieved, and the present invention has been completed.

すなわち、本発明の廃食用油の燃焼方法は、廃食用油を噴霧ノズルにより噴霧させてＡ重油と同様に燃焼させる廃食用油の燃焼方法であって、前記噴霧ノズルに供給される廃食用油を１．８ＭＰａ〜２．５ＭＰａに昇圧する手順と、前記噴霧ノズルに供給される廃食用油を９０℃〜１１０℃に昇温する手順と、前記供給される廃食用油の一部を供給側に戻しながら、その戻される廃食用油により廃食用油の外側を流れる１次空気による廃食用油の冷却を防止しながら噴霧ノズルに供給される廃食用油を前記温度に維持する手順とを含んでいることを特徴とする。 That is, the combustion method of waste edible oil according to the present invention is a combustion method of waste edible oil in which waste edible oil is sprayed by a spray nozzle and burned in the same manner as heavy fuel oil A, and the waste edible oil supplied to the spray nozzle The pressure is increased from 1.8 MPa to 2.5 MPa , the waste edible oil supplied to the spray nozzle is heated to 90 ° C. to 110 ° C. , and a part of the supplied waste edible oil is supplied on the supply side. And maintaining the temperature of the waste edible oil supplied to the spray nozzle at the temperature while preventing the cooling of the waste edible oil by the primary air flowing outside the waste edible oil by the returned waste edible oil. It is characterized by being.

また、本発明の廃食用油の燃焼方法においては、供給側に戻す廃食用油の割合が、噴霧させる廃食用油の３倍以上とされているのが好ましい。 Moreover, in the combustion method of the waste edible oil of this invention, it is preferable that the ratio of the waste edible oil returned to a supply side shall be 3 times or more of the waste edible oil to spray.

一方、本発明の廃食用油の燃焼装置は、廃食用油を噴霧ノズルにより噴霧させてＡ重油と同様に燃焼させる廃食用油の燃焼装置であって、前記燃焼装置が、廃食用油を前記噴霧ノズルに供給する内管と、前記廃食用油の一部を供給側に戻しながら前記噴霧ノズルに供給される廃食用油の温度を９０℃〜１１０℃に維持する保温外管と、前記保温外管の外周に配設された１次空気供給部とを備えてなることを特徴とする。 Meanwhile, the waste edible oil combustion apparatus of the present invention is a waste edible oil combustion apparatus in which waste edible oil is sprayed by a spray nozzle and burned in the same manner as heavy fuel oil A , wherein the combustion apparatus converts the waste edible oil into the waste edible oil. and the supply to the spray nozzle tube, a heat insulating outer tube to maintain the temperature of the cooking oil to be supplied to the spray nozzle with return to the supply side of the portion of the waste edible oil to 90 ° C. to 110 ° C., the And a primary air supply unit disposed on the outer periphery of the heat insulation outer tube .

本発明の廃食用油の燃焼装置においては、外周に気体燃料を燃焼させる燃焼装置が配設されてなるのが好ましい。   In the combustion apparatus for waste edible oil of the present invention, it is preferable that a combustion apparatus for burning gaseous fuel is disposed on the outer periphery.

また、本発明の廃食用油の燃焼装置においては、食用油を所定温度に昇温する加熱器を備えているのが好ましい。 Moreover, in the combustion apparatus of the waste edible oil of this invention, it is preferable to provide the heater which heats up edible oil to predetermined temperature.

さらに、本発明の廃食用油の燃焼装置においては、廃食用油を１．８ＭＰａ〜２．５ＭＰａに昇圧する昇圧手段を備えてなるのが好ましい。 Furthermore, in the waste edible oil combustion apparatus of the present invention, it is preferable to include a pressure raising means for raising the pressure of the waste edible oil to 1.8 MPa to 2.5 MPa .

本発明によれば、廃食用油を完全燃焼させることができ、燃焼室等の熱交換面に不完全燃焼物の付着や堆積がない清浄面が維持されるという優れた効果が得られる。また、それにより、廃食用油がＡ重油と同様の燃料としての利用される道が開かれ、その回収および再利用が促進されて廃食用油により環境汚染が防止されるという優れた効果も得られる。   ADVANTAGE OF THE INVENTION According to this invention, the waste cooking oil can be burned completely and the outstanding effect that the clean surface without the adhesion and accumulation of incomplete combustion products on the heat exchange surface, such as a combustion chamber, is acquired. This also opens the way for waste edible oil to be used as a fuel similar to A heavy oil, promotes its recovery and reuse, and has the excellent effect of preventing environmental pollution by waste edible oil. It is done.

以下、添付図面を参照しながら本発明を実施形態に基づいて説明するが、本発明はかかる実施形態のみに限定されるものではない。   Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

本発明の一実施形態に係る燃焼方法に適用される燃焼装置の要部を図１に断面図で示し、同燃焼装置を備えた吸収冷凍機の燃焼装置周りの燃料系統等を図２に示す。ここで、図１に示す燃焼装置Ａは廃食用油と燃料ガスとを混合燃焼させる燃焼装置とされているが、燃料ガスの燃焼に係る部分は、公知のものと同様とされているので、図１においては、理解の容易および作図の簡素化の観点から、燃料ガスの燃焼に係る部分の図示は適宜省略されている。   FIG. 1 shows a cross-sectional view of a main part of a combustion apparatus applied to a combustion method according to an embodiment of the present invention, and FIG. 2 shows a fuel system and the like around the combustion apparatus of an absorption refrigerator equipped with the combustion apparatus. . Here, the combustion apparatus A shown in FIG. 1 is a combustion apparatus that mixes and burns waste edible oil and fuel gas, but the part related to the combustion of the fuel gas is the same as a known one, In FIG. 1, from the viewpoint of easy understanding and simplification of drawing, illustration of portions related to combustion of fuel gas is omitted as appropriate.

燃焼装置Ａは、図１に示すように、廃食用油を供給する廃食用油供給部１０と、廃食用油供給部１０の外周に配設された１次空気を供給する１次空気供給部２０と、１次空気供給部２０の外周に配設された燃料ガスを供給する燃料ガス供給部３０とを主要部として備えてなるものとされる。   As shown in FIG. 1, the combustion apparatus A includes a waste edible oil supply unit 10 that supplies waste edible oil, and a primary air supply unit that supplies primary air disposed on the outer periphery of the waste edible oil supply unit 10. 20 and a fuel gas supply part 30 for supplying fuel gas disposed on the outer periphery of the primary air supply part 20 are provided as main parts.

廃食用油供給部１０は、廃食用油を供給する内管（供給管、例えば内径５ｍｍφ）１１および供給された廃食用油の一部を供給側に戻す外管（戻し管、例えば内径１０ｍｍφ）１２とからなる二重管１０Ａとされ、この二重管１０Ａの基端部には給排ブロック１３が配設され、その先端部には噴霧ブロック１４が配設されている。噴霧ブロック１４は公知の圧力噴霧バーナーに用いられている、防滴弁１４ａと噴霧ノズル１４ｂとを組み合わせた噴霧ノズルと同様とされているので、その構成の詳細な説明は省略する。   The waste edible oil supply unit 10 includes an inner pipe (supply pipe, for example, an inner diameter of 5 mmφ) 11 that supplies the waste edible oil, and an outer pipe (return pipe, for example, an inner diameter of 10 mmφ) that returns a part of the supplied waste edible oil to the supply side. 12, a double pipe 10A is provided with a supply / discharge block 13 at a base end portion thereof, and a spray block 14 is provided at a tip end portion thereof. Since the spray block 14 is the same as the spray nozzle used in a known pressure spray burner, which is a combination of the drip-proof valve 14a and the spray nozzle 14b, detailed description of its configuration is omitted.

ここで、供給側に戻される廃食用油の割合は、噴霧される廃食用油を所定温度に維持する観点から、供給される廃食用油の３割以上とされる。つまり、噴霧させる廃食用油の３倍以上で、かつ、前記所定温度が確保するものとされる。   Here, the ratio of the waste edible oil returned to the supply side is set to 30% or more of the supplied waste edible oil from the viewpoint of maintaining the sprayed waste edible oil at a predetermined temperature. That is, it is 3 times or more of the waste edible oil to be sprayed, and the predetermined temperature is ensured.

内管１１先端は、外管１２より所定長さ突出させられて噴霧ブロック１４に嵌合されている。この嵌合された内管１１は、噴霧ブロック１４内に形成された流路（図示省略）に連通させられるとともに、内管１１の外管１２から突出する箇所、つまり外管１２先端部には図示はされていないが、適宜シール部材、例えば蓋が設けられて、その箇所のシールが図られている。また、内管１１の外管１２先端部に位置する箇所には、図示はされていないが、廃食用油の一部を外管１２に戻すための戻し穴が所要数設けられている。廃食用油供給部１０が、かかる構成とされていることにより、供給管１１の廃食用油の温度が所定温度に維持されている。つまり、戻し管１２を流れる戻り油により供給管１１内部の廃食用油の保温が図られている。   The distal end of the inner tube 11 is projected from the outer tube 12 by a predetermined length and is fitted to the spray block 14. The fitted inner tube 11 is communicated with a flow path (not shown) formed in the spray block 14, and at a position protruding from the outer tube 12 of the inner tube 11, that is, at the distal end portion of the outer tube 12. Although not shown in the figure, a sealing member, for example, a lid is provided as appropriate, and the sealing of the portion is achieved. Although not shown, a required number of return holes for returning part of the waste edible oil to the outer tube 12 is provided at a position of the inner tube 11 located at the tip of the outer tube 12. Since the waste edible oil supply unit 10 is configured as described above, the temperature of the waste edible oil in the supply pipe 11 is maintained at a predetermined temperature. That is, the temperature of the waste cooking oil in the supply pipe 11 is kept by the return oil flowing through the return pipe 12.

給排ブロック１３は、図１および図３に示すように、二重管１０Ａ基端側から廃食用油を戻す戻し部１５と、廃食用油を供給する供給部１６とがこの順で一体的に接合形成された直方体状のブロック体とされている。   As shown in FIGS. 1 and 3, the supply / discharge block 13 includes a return portion 15 that returns waste edible oil from the base end side of the double pipe 10 </ b> A and a supply portion 16 that supplies waste edible oil in this order. It is set as the rectangular parallelepiped block body joined.

戻し部１５には、二重管１０Ａと面する面１５ａに外管１２が嵌合される嵌合部１５ｂが形成され、一側面に戻し口１５ｃが開口形成され、供給部１６と接合される面１５ｄに内管挿通路１５ｅが貫通形成されている。この戻し口１５ｃは、戻し部１５内部に形成される連通路１５ｆを介して嵌合部１５ｂに嵌合される外管１２と連通されている。この嵌合部１５ｂに嵌合される外管１２の基端部１２ａは、図３に示すように、先細テーパー状に形成されている。これにより、基端部１２ａの嵌合が容易になされる。   The return portion 15 is formed with a fitting portion 15b in which the outer tube 12 is fitted to a surface 15a facing the double tube 10A, and a return port 15c is formed on one side surface to be joined to the supply portion 16. An inner tube insertion passage 15e is formed through the surface 15d. The return port 15c communicates with the outer tube 12 fitted to the fitting portion 15b via a communication passage 15f formed inside the return portion 15. As shown in FIG. 3, the base end portion 12 a of the outer tube 12 fitted into the fitting portion 15 b is formed in a tapered shape. Thereby, fitting of base end part 12a is made easily.

供給部１６には、戻し部１５との接合面１６ａに内管１１が嵌合される嵌合部１６ｂが形成され、一側面に供給口１６ｃが開口形成されている。この供給口１６ｃが形成される面は、前記戻し口１５ｃが形成される面と異なる面とされるのが、供給配管ＦＰおよび戻し配管ＲＰの施工の煩雑さを避ける点から好ましい。この供給口１６ｃは、供給部１６内部に形成される連通路１６ｄを介して嵌合部１６ｂに嵌合される内管１１と連通されている。この嵌合部１６ｂおよび内管挿通路１５ｅに嵌合される内管１１の基端部１１ａは、図３に示すように、外径が小さくされて薄肉に形成されている。なお、基端部１１ａは必ずしも薄肉に形成される必要はない。   The supply portion 16 is formed with a fitting portion 16b into which the inner tube 11 is fitted on a joint surface 16a with the return portion 15, and an opening 16c is formed on one side surface. The surface on which the supply port 16c is formed is preferably a surface different from the surface on which the return port 15c is formed from the viewpoint of avoiding complicated construction of the supply pipe FP and the return pipe RP. The supply port 16c communicates with the inner tube 11 fitted to the fitting portion 16b via a communication passage 16d formed inside the supply portion 16. As shown in FIG. 3, the base end portion 11a of the inner tube 11 fitted to the fitting portion 16b and the inner tube insertion passage 15e is formed to be thin with a reduced outer diameter. Note that the base end portion 11a is not necessarily formed thin.

１次空気供給部２０は、具体的には、二重管１０Ａの先端から所定長さで外装された両端が開放された管状部材２０Ａとされる。   Specifically, the primary air supply unit 20 is a tubular member 20A that is externally covered with a predetermined length from the tip of the double tube 10A and is open at both ends.

ガス供給部３０は、具体的には、１次空気供給部２０を構成している管状部材２０Ａの先端から所定長さで外嵌されかつ両端が閉塞された管状部材３０Ａとされる。この管状部材３０Ａの先端部外周には、図示はされていないが、所要数のガス噴射孔が貫通形成されている。また、後部の適宜位置には燃料ガス供給配管ＧＰと接合される接続管３１が突出形成されている。   Specifically, the gas supply unit 30 is a tubular member 30A that is externally fitted with a predetermined length from the distal end of the tubular member 20A constituting the primary air supply unit 20 and closed at both ends. Although not shown, the required number of gas injection holes are formed through the outer periphery of the distal end portion of the tubular member 30A. Further, a connecting pipe 31 that is joined to the fuel gas supply pipe GP is formed to protrude at an appropriate position in the rear part.

次に、図２を参照しながら、かかる構成とされている燃焼装置Ａへの燃料系統を説明する。なお、図２は燃焼装置Ａを備えた吸収冷凍機の燃焼装置周りの系統図である。   Next, a fuel system to the combustion apparatus A configured as described above will be described with reference to FIG. FIG. 2 is a system diagram around the combustion device of the absorption refrigerator equipped with the combustion device A.

燃料系統Ｆは、廃食用油系統ＬＦと燃料ガス系統ＧＦとから構成されている。   The fuel system F includes a waste edible oil system LF and a fuel gas system GF.

廃食用油系統ＬＦは、燃焼装置Ａに廃食用油を供給する廃食用油供給配管ＦＰと、燃焼装置Ａから供給された廃食用油の一部を前記供給配管ＦＰに戻す廃食用油戻し配管ＲＰとを含む。   The waste edible oil system LF includes a waste edible oil supply pipe FP for supplying waste edible oil to the combustion apparatus A, and a waste edible oil return pipe for returning a part of the waste edible oil supplied from the combustion apparatus A to the supply pipe FP. RP.

廃食用油供給配管ＦＰには、図２に示すように、廃食用油が供給される上流側から入口止弁４１、ストレーナ４２、バッファタンク４３、噴霧ポンプ（昇圧手段）４４、加熱器４５、第１電磁弁４６および第２電磁弁４７がこの順で介装され、その先端部が燃焼装置Ａの給排ブロック１３の供給口１６ｃに嵌合されている。この供給配管ＦＰの加熱器４５の出口から給排ブロック１３までの部分は、テープ状加熱部材で被覆されてその部分の加熱および保温が図られている。なお、給排ブロック１３も同様に保温がなれている。   As shown in FIG. 2, the waste cooking oil supply pipe FP includes an inlet stop valve 41, a strainer 42, a buffer tank 43, a spray pump (pressure increase means) 44, a heater 45, from the upstream side where the waste cooking oil is supplied. The first electromagnetic valve 46 and the second electromagnetic valve 47 are interposed in this order, and the front ends thereof are fitted into the supply port 16 c of the supply / discharge block 13 of the combustion apparatus A. A portion from the outlet of the heater 45 of the supply pipe FP to the supply / discharge block 13 is covered with a tape-like heating member to heat and keep the portion. The supply / discharge block 13 is also kept warm in the same manner.

噴霧ポンプ４４は例えばギァポンプとされ、廃食用油の圧力をＡ重油と同等の噴霧粒径が得られる噴出エネルギーを与えるに十分な圧力、例えば１．８ＭＰａ〜２．５ＭＰａまで昇圧する能力を有するものとされる。   The spray pump 44 is, for example, a gear pump, and has the ability to increase the pressure of waste edible oil to a pressure sufficient to give a spray energy that can obtain a spray particle size equivalent to A heavy oil, for example, 1.8 MPa to 2.5 MPa. It is said.

加熱器４５は制御性および小型化の観点から電気式加熱器とされ、廃食用油の粘度をＡ重油と同等の噴霧粒径が得られる温度、例えば８５℃〜１１０℃まで、好ましくは９０℃〜１１０℃まで昇温する能力を有するものとされる。ただし、加熱器４５は電気式加熱器に限定されるものではなく、電気式加熱器と同等の制御性および小型化が図られるのであれば、蒸気式加熱器とされてもよい。   The heater 45 is an electric heater from the viewpoint of controllability and miniaturization, and the temperature of the waste edible oil is such that the spray particle size equivalent to that of A heavy oil can be obtained, for example, 85 ° C to 110 ° C, preferably 90 ° C. It has the ability to raise the temperature to ˜110 ° C. However, the heater 45 is not limited to an electric heater, and may be a steam heater as long as controllability and size reduction equivalent to those of the electric heater can be achieved.

また、燃焼装置Ａの給排ブロック１３からの戻し配管ＲＰは、ストレーナ４２とバッファタンク４３との間に戻されている。つまり、戻し配管ＲＰの先端は、ストレーナ４２とバッファタンク４３との間の供給配管ＦＰに接合されている。戻し配管ＲＰをこの位置に戻すのは、戻し配管ＲＰ内の圧力変化などにより戻し配管ＲＰ内に発生した気泡をバッファタンク４３により分離させるとともに、新たに供給される廃食用油を加熱するためである。   The return pipe RP from the supply / discharge block 13 of the combustion apparatus A is returned between the strainer 42 and the buffer tank 43. That is, the tip of the return pipe RP is joined to the supply pipe FP between the strainer 42 and the buffer tank 43. The reason why the return pipe RP is returned to this position is to separate bubbles generated in the return pipe RP due to a pressure change in the return pipe RP by the buffer tank 43 and to heat newly supplied waste cooking oil. is there.

この戻し配管ＲＰには、図２に示すように、上流側（給排ブロック１３側）から電磁弁（以下、主電磁弁という）５１および逆止弁５２が介装され、この主電磁弁５１の上流側には温度スイッチ５３が設けられている。この逆止弁５２により吸収冷凍機などの停止中における、戻し配管ＲＰによる廃食用油の逆流が防止されている。また、主電磁弁５１にはバイパス電磁弁５４を有するバイパスＢＰが設けられている。   As shown in FIG. 2, an electromagnetic valve (hereinafter referred to as a main electromagnetic valve) 51 and a check valve 52 are interposed in the return pipe RP from the upstream side (supply / discharge block 13 side). A temperature switch 53 is provided on the upstream side. The check valve 52 prevents the backflow of waste edible oil through the return pipe RP while the absorption refrigerator or the like is stopped. The main solenoid valve 51 is provided with a bypass BP having a bypass solenoid valve 54.

主電磁弁５１は、吸収冷凍機などの起動とともに開とされ、廃食用油の温度が所定温度、つまり廃食用油の噴霧粒径を燃焼可能な粒径とすることができる温度に到達すると、温度スイッチ５３からの信号により閉とされる。この主電磁弁５１が閉とされると、廃食用油供給部１０の圧力が上昇し、ついでその圧力が防滴弁１４ａの通過圧力以上になるとノズル１４ｂから廃食用油が噴霧される。一方、バイパス電磁弁５４は、吸収冷凍機など運転中は常時開とされて、所定量の廃食用油が供給側に戻されるようにされ、廃食用油供給部１０の温度が所定温度に維持されるようにされている。   When the main solenoid valve 51 is opened with the start of an absorption refrigerator or the like, and the temperature of the waste edible oil reaches a predetermined temperature, that is, a temperature at which the sprayed particle size of the waste edible oil can be made a combustible particle size, It is closed by a signal from the temperature switch 53. When the main electromagnetic valve 51 is closed, the pressure of the waste edible oil supply unit 10 rises, and then when the pressure exceeds the passage pressure of the drip-proof valve 14a, the waste edible oil is sprayed from the nozzle 14b. On the other hand, the bypass solenoid valve 54 is normally opened during operation of an absorption refrigerator, etc., so that a predetermined amount of waste cooking oil is returned to the supply side, and the temperature of the waste cooking oil supply unit 10 is maintained at a predetermined temperature. Has been to be.

ガス系統ＧＦは、燃料ガス供給部３０に燃料ガスを供給する燃料ガス供給配管ＧＰと、パイロットバーナーＰＢに燃料ガスを供給するパイロットガス供給配管ＰＰとを含む。   The gas system GF includes a fuel gas supply pipe GP that supplies fuel gas to the fuel gas supply unit 30, and a pilot gas supply pipe PP that supplies fuel gas to the pilot burner PB.

ガス供給配管ＧＰは、ガスストレーナ６１、主ガスユニット弁６２などを備えた公知構造のものとされ、ガスストレーナ６１と主ガスユニット弁６２との間からパイロットガス供給配管ＰＰが分岐されている。パイロットガス供給配管ＰＰは、パイロットガスユニット弁６３などを備えた公知構造のものとされている。   The gas supply pipe GP has a known structure including a gas strainer 61, a main gas unit valve 62, and the like, and a pilot gas supply pipe PP is branched from between the gas strainer 61 and the main gas unit valve 62. The pilot gas supply pipe PP has a known structure including a pilot gas unit valve 63 and the like.

なお、図２中、符号ＦＡは燃焼用空気系統を示し、符号ＩＧは燃料点火系統を示す。   In FIG. 2, the symbol FA indicates a combustion air system, and the symbol IG indicates a fuel ignition system.

しかして、かかる構成とされている燃焼装置Ａを備えた吸収冷凍機などにおいては、図２に示すように、燃焼用空気系統ＦＡの送風機７１からの燃焼用空気がダンパー７２により流量制御されてウインドボックス７３に供給され、その一部が１次空気供給部２０に１次空気として供給され、残部がガス保炎板７４およびディフューザ７５を介して２次空気として燃焼部に供給される。そして、燃焼装置Ａの廃食用油供給部１０から噴霧された廃食用油は、１次空気と混合された後、パイロットバーナーＰＢにより着火されて燃焼が開始される。なお、パイロットバーナーＰＢは、廃食用油の燃焼が安定すると消火される。   Therefore, in an absorption refrigerator including the combustion apparatus A having such a configuration, the flow rate of combustion air from the blower 71 of the combustion air system FA is controlled by the damper 72 as shown in FIG. It is supplied to the wind box 73, a part of which is supplied as primary air to the primary air supply unit 20, and the remaining part is supplied as secondary air to the combustion unit via the gas flame holding plate 74 and the diffuser 75. And the waste edible oil sprayed from the waste edible oil supply part 10 of the combustion apparatus A is mixed with primary air, and then ignited by the pilot burner PB to start combustion. The pilot burner PB is extinguished when the combustion of the waste edible oil is stabilized.

また、負荷が増大した場合には、燃料ガス供給部３０から燃料ガスが供給されて負荷の増大に対処するものとされる。   When the load increases, fuel gas is supplied from the fuel gas supply unit 30 to cope with the increase in load.

このように、本実施形態においては、廃食用油を８５℃〜１１０℃に加熱に加熱し、しかもその温度を維持させ燃焼装置Ａの廃食用油供給部１０に供給して圧力噴霧させているので、Ａ重油と同様に燃焼させることができる。そのため、廃食用油を有効な燃料源とすることができる。   Thus, in the present embodiment, the waste edible oil is heated to 85 ° C. to 110 ° C., and the temperature is maintained and supplied to the waste edible oil supply unit 10 of the combustion apparatus A for pressure spraying. Therefore, it can be burned in the same manner as A heavy oil. Therefore, waste edible oil can be used as an effective fuel source.

以下、実施例により、本発明をより具体的に説明する。   Hereinafter, the present invention will be described more specifically by way of examples.

参考例
本実施形態の燃焼装置によりＡ重油の温度を２５℃（常温）として適正な噴霧圧力（１．８ＭＰａ）により噴霧を行い、その噴霧粒子径および粒子径分布を測定し、その結果を図４に参考例として示す。 Reference Example Spraying is performed at an appropriate spray pressure (1.8 MPa) with the temperature of heavy oil A at 25 ° C. (normal temperature) by the combustion apparatus of the present embodiment, and the spray particle size and particle size distribution are measured. 4 shows a reference example.

実施例
燃焼装置への供給を廃食用油に変更するとともに、その温度を１１０℃とした他は参考例と同様にして噴霧を行い、その噴霧粒子径および粒子径分布を測定し、その結果を図４に実施例として併せて示す。 Example Spraying was performed in the same manner as in the Reference Example except that the supply to the combustion apparatus was changed to waste cooking oil and the temperature was changed to 110 ° C., and the spray particle size and particle size distribution were measured. FIG. 4 also shows an example.

比較例
廃食用油の温度を８０℃とした他は実施例と同様にして噴霧を行い、その噴霧粒子径および粒子径分布を測定し、その結果を図４に比較例として併せて示す。 Comparative Example Spraying was performed in the same manner as in the Example except that the temperature of the waste edible oil was set to 80 ° C., and the spray particle size and particle size distribution were measured. The results are also shown in FIG. 4 as a comparative example.

図４より、実施例においては参考例と同様の噴霧特性が得られているのがわかる。   FIG. 4 shows that the spray characteristics similar to those of the reference example are obtained in the example.

本発明は、廃食用油の燃焼に適用できる。   The present invention can be applied to the combustion of waste cooking oil.

本発明の一実施形態に係る廃食用油の燃焼方法に適用される燃焼装置の要部断面図である。It is principal part sectional drawing of the combustion apparatus applied to the combustion method of the waste edible oil which concerns on one Embodiment of this invention. 同燃焼装置を備えた吸収冷凍機の燃焼装置周りの系統図である。It is a systematic diagram around the combustion apparatus of an absorption refrigerator provided with the combustion apparatus. 同燃焼装置の給排ブロックの詳細図である。It is detail drawing of the supply / discharge block of the combustion apparatus. 実施例、比較例および参考例の噴霧特性を示すグラフである。It is a graph which shows the spraying characteristic of an Example, a comparative example, and a reference example.

符号の説明Explanation of symbols

１０ 廃食用油供給部
１１ 内管、供給管
１２ 外管、戻し管
１３ 給排ブロック
１４ 噴霧ブロック
１５ 戻し部
１６ 供給部
２０ １次空気供給部
３０ 燃料ガス供給部
４４ 噴霧ポンプ、昇圧手段
４５ 加熱器
Ａ 燃焼装置
Ｆ 燃料系統
ＬＦ 廃食用油系統
ＧＦ 燃料ガス系統 DESCRIPTION OF SYMBOLS 10 Waste cooking oil supply part 11 Inner pipe, supply pipe 12 Outer pipe, return pipe 13 Supply / discharge block 14 Spray block 15 Return part 16 Supply part 20 Primary air supply part 30 Fuel gas supply part 44 Spray pump, pressurizing means 45 Heating A Combustion device F Fuel system LF Waste cooking oil system GF Fuel gas system

Claims (6)

廃食用油を噴霧ノズルにより噴霧させてＡ重油と同様に燃焼させる廃食用油の燃焼方法であって、
前記噴霧ノズルに供給される廃食用油を１．８ＭＰａ〜２．５ＭＰａに昇圧する手順と、
前記噴霧ノズルに供給される廃食用油を９０℃〜１１０℃に昇温する手順と、
前記供給される廃食用油の一部を供給側に戻しながら、その戻される廃食用油により廃食用油の外側を流れる１次空気による廃食用油の冷却を防止しながら噴霧ノズルに供給される廃食用油を前記温度に維持する手順
とを含んでいることを特徴とする廃食用油の燃焼方法。 A method for burning waste edible oil in which waste edible oil is sprayed by a spray nozzle and burned in the same manner as heavy oil A ,
A procedure for boosting waste edible oil supplied to the spray nozzle to 1.8 MPa to 2.5 MPa ;
A procedure for raising the temperature of the edible oil supplied to the spray nozzle to 90 ° C. to 110 ° C . ;
While returning a part of the supplied waste edible oil to the supply side, the returned edible oil is supplied to the spray nozzle while preventing the cooling of the used edible oil by the primary air flowing outside the waste edible oil. And a procedure for maintaining the temperature of the edible edible oil at the temperature . 供給側に戻す廃食用油の割合が、噴霧させる廃食用油の３倍以上とされていることを特徴とする請求項１記載の廃食用油の燃焼方法。 The method for combusting waste edible oil according to claim 1, wherein the ratio of waste edible oil returned to the supply side is at least three times that of the waste edible oil to be sprayed. 廃食用油を噴霧ノズルにより噴霧させてＡ重油と同様に燃焼させる廃食用油の燃焼装置であって、
前記燃焼装置が、廃食用油を前記噴霧ノズルに供給する内管と、前記廃食用油の一部を供給側に戻しながら前記噴霧ノズルに供給される廃食用油の温度を９０℃〜１１０℃に維持する保温外管と、前記保温外管の外周に配設された１次空気供給部とを備えてなることを特徴とする廃食用油の燃焼装置。 A waste edible oil combustion apparatus in which waste edible oil is sprayed by a spray nozzle and burned in the same manner as A heavy oil,
Said combustion device, and the pipe for supplying the cooking oil in the spray nozzle, 90 ° C. The temperature of the cooking oil to be supplied to the spray nozzle with return to the supply side of the portion of the waste edible oil to 110 A combustion apparatus for waste edible oil , comprising: a heat insulation outer tube maintained at ° C .; and a primary air supply unit disposed on an outer periphery of the heat insulation outer tube . 外周に気体燃料を燃焼させる燃焼装置が配設されてなることを特徴とする請求項３記載の廃食用油の燃焼装置。 4. A combustion apparatus for waste cooking oil according to claim 3, wherein a combustion apparatus for burning gaseous fuel is disposed on the outer periphery. 廃食用油を前記温度に昇温する加熱器を備えてなることを特徴とする請求項３記載の廃食用油の燃焼装置。 The combustion apparatus for waste edible oil according to claim 3 , further comprising a heater for raising the temperature of the waste edible oil to the temperature. 廃食用油を１．８ＭＰａ〜２．５ＭＰａに昇圧する昇圧手段を備えてなることを特徴とする請求項３記載の廃食用油の燃焼装置。 4. The waste edible oil combustion apparatus according to claim 3 , further comprising pressure increasing means for increasing the pressure of the waste edible oil to 1.8 MPa to 2.5 MPa .
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56173835U (en) * 1980-05-21 1981-12-22
JPH04295506A (en) * 1991-03-25 1992-10-20 Noritz Corp Spray nozzle for combustion
JPH07217847A (en) * 1994-02-02 1995-08-18 Samuson:Kk Waste oil combustion device
JP2001330228A (en) * 2000-05-19 2001-11-30 Kawasaki Thermal Engineering Co Ltd Method and apparatus for mixed combustion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56173835U (en) * 1980-05-21 1981-12-22
JPH04295506A (en) * 1991-03-25 1992-10-20 Noritz Corp Spray nozzle for combustion
JPH07217847A (en) * 1994-02-02 1995-08-18 Samuson:Kk Waste oil combustion device
JP2001330228A (en) * 2000-05-19 2001-11-30 Kawasaki Thermal Engineering Co Ltd Method and apparatus for mixed combustion

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