Waste energy recovery system

Abstract

A waste energy recovery system includes a furnace for the combustion of charcoal, tree branches, wood and/or waste wood furniture under lean oxygen, cooling water filters, dry purifiers, and an exhaust fan for creating a negative pressure in the furnace, the cooling water filters and the dry purifiers such that the loaded charcoal, tree branches, wood and/or waste wood furniture are smoldered in the furnace and decomposed into oil, smoke and dust mixed gas, enabling the oil, smoke and dust mixed gas to be cooled down and separated into crude tar and inflammable gas after entered the cooling water filters. Thus, the waste energy recovery system effectively separates smoke and oil for recycling without emitting soot or using any fuel material that can cause pollution hazards.

What the invention claimed is: 
     
         1 . A waste energy recovery system, comprising a furnace, at least one cooling water filter, at least one dry purifier and an exhaust fan, wherein:
 said furnace, said at least one cooling water filter, said at least one dry purifier and said exhaust fan are connected in series by closed conduits; said exhaust fan is disposed near a rear end of the waste energy recovery system; said furnace comprises a waste inlet located in a top side thereof for enabling the user to put wastes into the inside of said furnace, an unidirectional airtight cover covered said waste inlet, an ash outlet located in an opposing bottom side thereof for discharge of burnt charcoal and carbonized wastes, an unidirectional airtight cover covered said ash outlet, and at least one air inlet located in the periphery thereof; charcoal, tree branches, wood and/or waste wood furniture are put in a bottom side inside said furnace for use as a fuel material, and assorted wastes are put through said waste inlet into the inside of said furnace, and an igniter is inserted through one said air inlet into the inside of said furnace to ignite the charcoal, and at the same time, said exhaust fan is turned on to draw air and to create a negative pressure in said furnace, said at least one cooling water filter and said at least one dry purifier so that outside air is drawn through said at least one air inlet into the inside of said furnace and thus a limited volume of oxygen is provided for the combustion of the loaded charcoal, tree branches, wood and/or waste wood furniture; subject to the functioning of said exhaust fan to draw air and the functioning of said at least one air inlet of said furnace to intake air, the burning temperature in said furnace is over 1000° C., and the loaded charcoal, tree branches, wood and/or waste wood furniture are being smoldered in said furnace due to combustion under lean oxygen, and thus, the loaded wastes in contact with this temperature field of over 1000° C. are immediately decomposed into oil, smoke and dust mixed gas, at this time, a part of the tar in the oil, smoke and dust mixed gas is removed when the oil, smoke and dust mixed gas flows over the hot carbon layer of over 1000° C., and then the temperature of the oil, smoke and dust mixed gas is lowered when the oil, smoke and dust flows through an internal raceway in said furnace into said at least one cooling water filter, and thus, the oil, smoke and dust mixed gas is cooled down to room temperature and then separated into crude tar and inflammable gas after entered said at least one cooling water filter.   
     
     
         2 . The waste energy recovery system as claimed in claim  claim 1 , wherein said at least one cooling water filter comprises a first cooling water filter and a second cooling water filter, said first cooling water filter having a cooling water circulating pipe inserted therethrough for the circulation of a cooling water so that the generated oil, smoke and dust mixed gas flows out of said furnace through one said closed conduit into said first cooling water filter to contact with the periphery of said cooling water circulating pipe for heat exchange where a major part of crude tar in the oil, smoke and dust mixed gas is cooled down to fall to a bottom side in said first cooling water filter and then to flow out of said first cooling water filter through a bottom-sided crude tar discharge pipe for collection. 
     
     
         3 . The waste energy recovery system as claimed in  claim 1 , wherein said dry purifier comprises a first dry purifier and a second dry purifier; said second cooling water filter has a cooling water pipe connected thereto for guiding external cooling water into said cooling water filter for direct contact with the oil, smoke and dust mixed gas so that the oil, smoke and dust mixed gas is secondarily cooled down, causing the rest crude tar in the oil, smoke and dust mixed gas to float on the surface of the cooling water in said second cooling water filter and then guided out of said second cooling water filter through another said crude tar discharge pipe for collection, and the rest inflammable gas flows through another said closed conduit into said first dry purifier where internal filter materials of active carbon and/or HePa filter media in said first dry purifier removes micro dust and water moisture from the inflammable gas to perform a primary drying and purification process, and then flows out of said first dry purifier through another said closed conduit into said second dry purifier where internal filter materials of active carbon and/or HePa filter media in said second dry purifier removes micro dust and water moisture from the inflammable gas to perform a secondary drying and purification process, and the purified inflammable gas is then guided by gas pipes to burner stoves for application or converted by an external liquefaction equipment into liquid inflammable gas for storage and application. 
     
     
         4 . The waste energy recovery system as claimed in  claim 3 , wherein when the active carbons in said first dry purifier have a large amount of impurities adhered thereto after a long period of application, the active carbons are removed from said second dry purifier and delivered to said furnace for heating and carbonization for repeated use. 
     
     
         5 . The waste energy recovery system as claimed in  claim 1 , wherein 3% strongly alkaline lime powder is added to the wastes been put in said furnace for combustion gasification to prevent generation of a large amount of superacidic gas mixture that is capable of causing smoke oil in gas to become viscous, plugging pipelines being connected to said furnace and corroding said furnace, and the percentage of the strongly alkaline lime powder is adjustable subject to the amount of plastics in the wastes been put in said furnace; said furnace is selected from the material group of class 310 stainless steel, acid resistant steels and firebricks for direct contact with the wastes. 
     
     
         6 . The waste energy recovery system as claimed in  claim 1 , further comprising a manifold connected between said second cooling water filter and said furnace, and openable to guide the heated cooling water from said second cooling water filter into said furnace to increase the moisture content of the wastes when the moisture content of the wastes in said furnace is low.