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Method of gasification of wasteRelated Patent Categories: Furnaces, With Fuel Treatment MeansMethod of gasification of waste description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070181047, Method of gasification of waste. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] This invention relates to a method of treating waste. BACKGROUND OF THE INVENTION [0002] In the context of the rise of environmental consciousness and the tightening of environmental legislation, industry is currently using a wide variety of waste treatment methods. These include for example: incineration, anaerobic digestion, land fill, thermophilic composting, by-product rendering, gasification and pyrolysis. The present invention is in essence an improvement to a gasification method of treating waste. The closest prior art known to the applicant comprises a drier using a turbulent flow of heated air and a centrifuge action followed by a gas converter to convert waste into gas suitable for combustion. This prior art method takes untreated general domestic waste and submits the waste directly to this two-step process of drying and gasification. [0003] One of the objectives of the present invention is to present a method which can be suitable for the treatment of not only primarily solid domestic waste but also can be used to treat waste with a high liquid content. It is a ether objective of this invention to provide a method which is suitable for liquid/solid mixture waste treatment. [0004] The invention also aims to provide a method which has improved thermal characteristics. The invention further aims at reducing or eliminating altogether undesirable odour emission. [0005] It is also a particular objective of the invention to present a method of treatment of waste suitable for treatment of poultry waste containing feathers. SUMMARY OF THE INVENTION [0006] In a first broad aspect, the invention provides a method of treating waste comprising the steps of drying said waste and submitting said dried waste to gasification for producing a combustible gas, characterised in that the method comprises the step of separating the waste into a portion for shredding and a portion for filtering prior to drying. [0007] This combination of method steps is particularly advantageous because it allows the method to apply to waste which is other than pure solid waste and particularly to waste where there is a portion of solid, associated with a high portion of liquid/solid mixture waste. This method contributes to maximising the amount of waste susceptible of being submitted to drying and gasification. This will also reduce the extent to which waste liquid would have to be treated to meet stringent environmental levels. [0008] In a second broad aspect, the invention provides a method of treating waste, comprising the steps of drying said waste and submitting said waste to gasification for producing a combustible gas, characterised in that the method comprises the step of submitting liquid waste with solids in suspension in the liquid to filtering means to substantially separate primarily solid waste from primarily liquid waste prior to drying said primarily solid waste. [0009] This combination of method steps is unique in that it allows the treatment in this context of liquid waste containing solids in suspension which would hitherto have been simply discarded. [0010] In a third broad aspect, the invention provides a method of treating waste, comprising the steps of drying said waste by supplying heated air to said waste, submitting said dried waste to gasification for producing a combustible gas, burning said gas to generate electricity and exchanging heat from the burning of the gas with the air supply to the waste for drying the waste. [0011] Providing such a heat exchange renders this method more energy efficient and more environmentally friendly. This is particularly beneficial when drying materials which have a high liquid content near 30% because the energy consumption for satisfactorily drying this kind of waste would otherwise be quite substantial. [0012] In a fourth broad aspect, the invention provides a method of treating waste, comprising the steps of collecting and cooling waste, drying said waste and submitting said dried waste to gasification for producing a combustible gas. [0013] Cooling waste marks a radical departure from the prior art teaching of either simply adequately sealing waste or treating gaseous emissions from waste. [0014] In a subsidiary aspect in accordance with any of the preceding aspects, the method when applied to waste containing feathers comprises the step of submitting quills of feathers to a cutter with a plurality of cutter blades so configured to section the quills. [0015] This is particularly advantageous, it reduces the risk of any quills progressing through the system and possibly blocking certain areas. This method therefore is advantageous because it reduces the frequency at which any apparatus implementing this method would have to be serviced as a consequence of quills building up in a particular location. [0016] In a further subsidiary aspect in accordance with any of the preceding broad aspects, the method comprises the step of routing the exhausts from the drying step and the gasification step to a single thermal oxidiser. [0017] This is a particularly efficient method of reducing or eliminating altogether pollution from the drying and gasification steps whilst being particularly efficient in terms of the manufacturing steps required and apparatus that would be required to carry out this method. [0018] The invention also provides an apparatus adapted to carry out a method in accordance with any of the preceding aspects. DETAILED DESCRIPTION OF THE FIGURE [0019] The single figure accompanying this application illustrates one example of the method of the present invention. The method illustrated shows the arrival of dry material in lorries and the arrival of fluid/solid mixture such as a slurry in a pipe line. It is envisaged employing a sealed unloading bay when using vehicles to transport waste. The unloading bay may be isolated from the rest of the plant by sealed doors. Means may be provided to ensure that the building operates under a negative pressure to reduce the possibility of gases escaping. The lorry may tip its load into a sunken pit from where the waste can be screw fed onto either a belt conveyor or any other transport means as selected by the person skilled in the art. The pit may comprise a sealed lid to prevent odour leakage. A drainage system is envisaged to pump any spills during unloading to an effluent treatment plant. Strainers (for example with 4mm drain traps) may be fitted to the drainage system to capture solids for further treatment. [0020] The method envisages that waste would be stored prior or during treatment in order to allow the method to be flexible. The waste may be collected for example in storage tanks where for tanks containing liquid/solid mixtures, cooling coils may be employed to maintain a stable temperature and reduce fugitive losses which are typically present during hot weather. These tanks will be typically enclosed, lidded vessels. These tanks may be emptied by pump or screw auger should the waste stored be suitable for flowing. The tanks envisaged may incorporate vents fitted with carbon filters to prevent odour escaping during filling or breathing. The tanks may also be fitted with level sensors and alarms to prevent over-filling. Continue reading about Method of gasification of waste... Full patent description for Method of gasification of waste Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method of gasification of waste 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 Method of gasification of waste or other areas of interest. ### Previous Patent Application: Locking vault and its method of installation Next Patent Application: Pneumatic distributor of granular and/or powedery materials, in particular for sowing machines Industry Class: Furnaces ### FreshPatents.com Support Thank you for viewing the Method of gasification of waste patent info. IP-related news and info Results in 0.13362 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , 174 |
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