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  Combustion apparatus for treating dry distillation gasUSPTO Application #: 20070117055Title: Combustion apparatus for treating dry distillation gas Abstract: The present invention intends to provide an improved combustion apparatus with a low risk of a fire and an explosion, in which a nozzle is prevented from being blocked with dust contained in dry distillation gas so that backfiring would not be caused. A combustion apparatus for treating dry distillation gas is thus constructed with a gas pipe for supplying a combustion chamber with dry distillation gas generated during a waste treatment by means of dry distillation and an air pipe for supplying a front edge of the gas pipe with combustion air, wherein the air pipe is placed inside the gas pipe to construct a coaxial double pipe so that it forms a circular combustion nozzle at the front edge of the gas pipe. (end of abstract) Agent: Hamre, Schumann, Mueller & Larson, P.C. - Minneapolis, MN, US Inventor: Kiyoharu Michimae USPTO Applicaton #: 20070117055 - Class: 431003000 (USPTO) Related Patent Categories: Combustion, Process Of Combustion Or Burner Operation, Decarbonizing, Cleaning Or Purging The Patent Description & Claims data below is from USPTO Patent Application 20070117055. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a combustion apparatus for combusting and treating dry distillation gas generated during a waste treatment by means of dry distillation. BACKGROUND ART [0002] A waste treatment system comprising a combustion apparatus for treating waste by means of dry distillation in a pyrolysis furnace, with which dry distillation gas generated during the waste treatment is burnt for detoxification and resultant heat is extracted for recycling, is disclosed in patent document 1 filed by the applicant of the present application. (Japanese published patent application No.2001-108210) [0003] The waste treatment system disclosed in said patent document comprises a pyrolysis furnace, an inert gas generator, and a generated gas treatment device. Dry distillation residue caused by the dry distillation treatment of waste in the pyrolysis furnace is transferred to the inert gas generator and inert gas generated from the dry distillation residue is returned to the pyrolysis furnace. The dry distillation gas generated during the waste treatment by means of the dry distillation is burnt in the generated gas treatment device to be extracted as heat for recycling, or if the generated gas is high in heat quantity, to be reformed and recovered as oil. [0004] The dry distillation gas is less susceptible to dust contamination than combustion gas generated by incineration of waste, and thus it is beneficial in that combustion atmosphere can be maintained at high temperature while at the same time a level of exhaust gas can be kept low. The waste treatment by means of dry distillation is thus more advantageous than ordinary incineration treatment in the areas of exhaust gas detoxification and thermal recycling. [0005] This type of waste treatment apparatus is required to be equipped with a means of preventing a fire and an explosion. [0006] Conventionally, multiple nozzles with small diameter are bundled to act as a porous nozzle and used for burning the dry distillation gas. Combustion air is infused from the circumference space of each nozzle into the combustion chamber so that it mixes with the dry distillation gas and increases combustion temperature. With this arrangement, backfiring can be prevented by using the nozzles with small diameter. [0007] Disadvantageously, however, the dry distillation gas can still get contaminated with a small amount of dust resulting from treating various types of waste and such dust would problematically block feed openings. It is ineffectual to simply enlarge the apertures of the porous nozzle in order to solve this problem, since it would cause backfiring that would blow back through the feed openings to the pyrolysis furnace and set off an explosion. [0008] Also disadvantageously, a flow volume and a flow rate of the dry distillation gas may change at intake openings and the feed openings where a flow channel of the dry distillation gas varies in width and direction, thus the dust contained in the dry distillation gas would become solated and remain on the wall. [0009] The solated material accumulated over an extended time period of continuous running of the apparatus becomes solid as time progresses, making it difficult to be removed. This can result in defects such as blocking of the feed openings, which consequently causes turbulent flow of the dry distillation gas to be supplied to the combustion chamber. [0010] Still disadvantageously, an amount of the dry distillation gas to be supplied to the combustion chamber widely fluctuates, because of irregular generation of the dry distillation gas as a result of treating a mixture of various wastes. The flow rate of the dry distillation gas thus becomes turbulent, which could result in backfiring. SUMMARY OF THE INVENTION [0011] The present invention intends to provide an improved combustion apparatus with a low risk of a fire and an explosion, in which a nozzle is prevented from being blocked with dust contained in dry distillation gas so that backfiring would not be caused. [0012] In order to achieve this objective, a combustion apparatus for treating dry distillation gas as defined in claim 1 comprises: a gas pipe for supplying a combustion chamber with dry distillation gas generated during a waste treatment by means of dry distillation; an air pipe for supplying a front edge of said gas pipe with combustion air; and a combustion nozzle formed at said front edge of said gas pipe; wherein, said air pipe is centrally placed inside said gas pipe so as to construct a coaxial double pipe, and said combustion nozzle is formed as a circular combustion nozzle at said front edge of said gas pipe. [0013] In the combustion apparatus for treating dry distillation gas as defined in claim 2, said air pipe is supported to be axially rotatable, and scrapers are further provided with blades of said scrapers being in contact with a circumference surface of said air pipe. [0014] In the combustion apparatus for treating dry distillation gas as defined in claim 3, an inner circumferential surface of said front edge of said gas pipe is beveled inward at predetermined angle to form a narrowed portion, and said air pipe is supported to be movable back-and-forth relative to said narrowed portion. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 is a side view of a combustion apparatus for treating dry distillation gas according to the present invention. [0016] FIG. 2 is a partially sectional plain view of the combustion apparatus for treating dry distillation gas according to the present invention. [0017] FIG. 3 is a sectional view of FIG. 2 along the line F-F. [0018] FIG. 4 is a sectional view of FIG. 2 along the line A-A. [0019] FIG. 5 is a sectional view of FIG. 2 along the line C-C. [0020] FIG. 6 is a sectional view of FIG. 5 along the line B-B. Continue reading... Full patent description for Combustion apparatus for treating dry distillation gas Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Combustion apparatus for treating dry distillation gas 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 Combustion apparatus for treating dry distillation gas or other areas of interest. ### Previous Patent Application: Photothermographic materials containing post-processing stabilizers Next Patent Application: Negative pressure conditioning device with low pressure cut-off Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Combustion apparatus for treating dry distillation gas patent info. 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