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  Hydrogen combustion device having hydrogen pipeUSPTO Application #: 20060127832Title: Hydrogen combustion device having hydrogen pipe Abstract: A hydrogen combustion device includes a casing 30, a hydrogen source, a hydrogen pipe 39 to supply hydrogen gas from the hydrogen source into the casing 30, a mixer 10 on the downstream side of the pipe 39, for stirring a mixed gas and a combustion catalyst 20. The hydrogen pipe 39 has a hydrogen pipe body 40 and a hydrogen ejecting part 41 with hydrogen ejecting orifices 42. In the hydrogen combustion device, the hydrogen ejecting part 41 is positioned at a substantial center in the cross section of an air passage in the casing 30, extending along the flowing direction of the airflow in the air passage. The hydrogen ejecting orifices 40 are arranged so that their axes extend in the radial direction of the hydrogen ejecting part 41, substantially perpendicularly to the flowing direction of the airflow. (end of abstract) Agent: Foley And Lardner LLP Suite 500 - Washington, DC, US Inventors: Tamotsu Sugimoto, Koichi Yamaguchi, Yoshiyuki Tsuru USPTO Applicaton #: 20060127832 - Class: 431326000 (USPTO) Related Patent Categories: Combustion, Porous, Capillary, Particulate Or Sievelike Flame Holder, E.g., Radiant Surface Burner, Etc. The Patent Description & Claims data below is from USPTO Patent Application 20060127832. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a hydrogen combustion device for generating oxidative reaction heat of hydrogen-gas by a catalyst. More particularly, the present invention relates to a hydrogen pipe arranged in the hydrogen combustion device to introduce hydrogen from a hydrogen source into the hydrogen combustion device. BACKGROUND ART [0002] As the conventional hydrogen combustion device, Japanese Patent Application Laid-open No. 2002-122311 discloses one hydrogen combustion device that allows mixed gas of hydrogen gas and air to be exposed to a catalyst to generate oxidative reaction heat as a heat source. In the hydrogen combustion device, a hydrogen pipe is arranged in an airflow supply passage and adapted so as to spout hydrogen gas to produce the mixed gas. [0003] In arrangement, the hydrogen pipe is arranged so as to cross a section of the airflow supply passage in the substantially-diametrical direction. Further, the hydrogen pipe has hydrogen discharge orifices formed in a cross part of the pipe to spout hydrogen gas. [0004] In the conventional hydrogen combustion device mentioned above, the hydrogen pipe has the hydrogen discharge orifices whose number and position are adjusted in consideration of speed of the airflow, the flow volume, etc. in order to mix hydrogen gas ejected from the hydrogen discharge orifices with the airflow effectively. [0005] As a result, the structure of the hydrogen pipe including the number and position of the hydrogen discharge orifices is apt to be complicated and therefore, the number and position of the hydrogen discharge orifices have to be determined upon executing simulation and experiment repeatedly, thereby causing the manufacturing cost of the hydrogen pipe to be increased in its ejecting part of hydrogen gas. [0006] Further, since the hydrogen discharge orifices are arranged so as to oppose the airflow in view of effective mixing of hydrogen gas with the airflow, it is necessary to eject hydrogen gas in opposition to the dynamic pressure of the airflow. Thus, a supply pressure of hydrogen gas has to be increased with the necessity of enhancing the accuracy of a supply route of hydrogen gas in terms of leak-tight capability. DISCLOSURE OF INVENTION [0007] In such a situation, it is an object of the present invention to provide a hydrogen combustion device having a hydrogen pipe that can simplify the structure of the hydrogen discharge orifices and reduce the supply pressure of hydrogen gas with the improved arrangement of a hydrogen ejecting part of the pipe against the airflow. [0008] According to the first aspect of the present invention, the above-mentioned object is accomplished by a hydrogen combustion device comprising: a casing defining a passage for airflow therein; a hydrogen source arranged outside the casing; a hydrogen pipe arranged so as to extend from the hydrogen source into the passage for airflow thereby to supply hydrogen gas from the hydrogen source into the airflow flowing in the casing, the hydrogen pipe having a hydrogen pipe body and a hydrogen ejecting part arranged at the leading end of the hydrogen pipe body and also provided with a plurality of hydrogen ejecting orifices; a mixer arranged close to the hydrogen pipe, for stirring the mixed gas; and a combustion catalyst arranged on the downstream side of the mixer in the flowing direction of the airflow to cause an oxidative reaction of the mixed gas thereby generating heat, wherein the hydrogen ejecting part is positioned at a substantial center in the cross section of the passage defined in the casing and also arranged so as to extend along the flowing direction of the airflow, and the hydrogen ejecting orifices are arranged so that their axes extend in the radial direction of the hydrogen ejecting part, substantially perpendicularly to the flowing direction of the airflow. [0009] Then, since the hydrogen ejecting part is arranged, at the substantial center in the cross section of the passage, so as to extend along the flowing direction of the airflow, it is possible to provide the hydrogen ejecting part with the hydrogen ejecting orifices whose axes extends in the radial direction of the hydrogen ejecting part perpendicularly to the airflow. As a result of the formation, it becomes possible to mix the hydrogen gas ejected from the hydrogen ejecting orifices with the airflow effectively. [0010] Therefore, if only forming the plural hydrogen ejecting orifices at substantial-regular interval in the circumferential direction of the hydrogen ejecting part, then the whole structure of the hydrogen ejecting orifices can be simplified to reduce the manufacturing cost of the hydrogen ejecting part. [0011] According to the second aspect of the invention, in the above-constructed hydrogen combustion device, the hydrogen ejecting part is arranged so as to face the upstream side of the airflow and is provided with a tapered leading end. [0012] Owing to the provision of the tapered leading end, the airflow can flow around the hydrogen ejecting part along the tapered leading end smoothly, it is possible to suppress an occurrence of eddy currents on the upstream side of the hydrogen ejecting orifices, whereby the hydrogen gas ejected from the orifices can be mixed with the airflow effectively. [0013] According to the third aspect of the invention, the hydrogen ejecting part is formed to have the same diameter as that of the hydrogen pipe body and the hydrogen ejecting part is welded to the hydrogen pipe body perpendicularly. [0014] In this case, the structure of the hydrogen pipe as a whole can be simplified. [0015] According to the fourth aspect of the invention, the hydrogen pipe is arranged in a manner that the hydrogen ejecting part takes its position on the upstream side of the mixer in the flowing direction of the airflow, while the hydrogen pipe body takes its position inside the mixer. [0016] With the above arrangement of the hydrogen pipe, it is possible to eliminate an interval between the hydrogen pipe body and the mixer, so that the whole length of the hydrogen combustion device can be shortened to miniaturize the whole hydrogen combustion device. [0017] According to the fifth aspect of the invention, the hydrogen ejecting orifices have different diameters. [0018] According to the sixth aspect of the invention, in connection with the fifth aspect of the invention, the hydrogen ejecting orifice on the upstream side in the flowing direction of hydrogen gas flowing in a straight part of the hydrogen pipe body is formed to have a small diameter in comparison with the diameter of the hydrogen ejecting orifice on the downstream side in the flowing direction of hydrogen gas flowing in the straight part of the hydrogen pipe body. [0019] In this case, the hydrogen ejecting orifice on the downstream side in the flowing direction of hydrogen gas is subjected to a large inertia force of the flowing hydrogen gas. Nevertheless, since the hydrogen ejecting orifice on the downstream side of the hydrogen-gas flow has a small diameter, the flowing resistance of hydrogen gas passing through this orifice is increased. While, the hydrogen ejecting orifice on the upstream side in the flowing direction of hydrogen gas is subjected to a small inertia force of the flowing hydrogen gas. Nevertheless, since the hydrogen ejecting orifice on the upstream side of the hydrogen-gas flow has a large diameter, the flowing resistance of hydrogen gas passing through this orifice is reduced. In this way, owing to this offset effect between the inertia force of the hydrogen-gas flow and the flowing resistance, it is possible to eject the hydrogen gas through both of the hydrogen ejecting orifices having large and small diameters uniformly. [0020] These and other objects and features of the present invention will become more fully apparent from the following description and appended claims taken in conjunction with the accompany drawings. BRIEF DESCRIPTION OF DRAWINGS Continue reading... Full patent description for Hydrogen combustion device having hydrogen pipe Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Hydrogen combustion device having hydrogen pipe patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Hydrogen combustion device having hydrogen pipe or other areas of interest. ### Previous Patent Application: Waste oil multi-fuel fired burner Next Patent Application: Process for producing continuous alumina fiber blanket Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Hydrogen combustion device having hydrogen pipe patent info. 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