# US 4,398,475 A · Hazardous waste incineration system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,398,475 A - Document ID: US4398475A - Status: Granted - Kind: A - Application number: 06/273,754 - Filed: 1981-06-15 - Granted: 1983-08-16 - Earliest claimed: 1981-06-15 - Assignees: SSK Corporation - Inventors: Charles W. McKiel, Jr. - Web page: https://patentgrep.com/patent/US4398475A ## CPC - F23G 7/008: {for liquid waste (waste oil F23G7/05, waste liquors F23G7/04, sludges F23G7/001)} - F23G 5/16: in a separate combustion chamber - F23G 2900/50001: Combination of two or more furnaces - F23G 2900/7011: Incinerating PCB-materials - F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION ## Abstract A hazardous waste incineration system is provided in which a series of interconnected combustion chambers are employed to obtain successively higher temperatures in successive chambers, the gaseous products of combustion in each chamber being supplied to the next chamber in the series to act as a high temperature environment and promote the burning of hazardous wastes in successive chambers which require successively higher temperatures to become volatilized and break down into their constituent elements. Preferably, the successive chambers have successively larger volumes so that successively greater amounts of hazardous wastes, which may be of successively lower heat values and require successively higher temperatures to be broken down, may be burned in the successive combustion chambers of the series. ## Claims ### Claim 1 The method of disposing of hazardous wastes which comprises the step of, burning low viscosity, high heat value liquid hazardous waste at a relatively slow rate in a first combustion chamber, supplying the gaseous products of combustion to a second combustion chamber to act as a sustained high temperature environment therein, and burning in said second chamber at a substantially increased rate liquid hazardous waste of somewhat less heat value than the hazardous waste burned in said first chamber. ### Claim 2 (depends on 1) The method of claim 1, wherein the liquid waste supplied to said second chamber is burned at a temperature higher than the temperature at which the liquid waste supplied to said first chamber is burned. ### Claim 3 (depends on 1) The method of claim 1, which includes the steps of supplying the gaseous products of combustion of said second chamber to a third chamber to act as a sustained high temperture environment therein, said high temperature environment in said third chamber being of higher temperature than said high temperature environment in said second chamber. ### Claim 4 (depends on 3) The method of claim 3, which includes the step of burning liquid hazardous waste in said third chamber at a rate substantially greater than the rate at which hazardous waste is burned in either of said first and second chambers. ### Claim 5 The method of disposing of hazardous waste, which comprises the steps of burning hazardous waste in a first combustion chamber at a relatively slow rate, supplying the gaseous products of combustion of said first chamber to a second combustion chamber to act as a sustained high temperature environment and promote the burning of hazardous waste therein, and burning hazardous waste in said second combustion chamber at a rate substantially greater than the rate at which hazardous waste is burned in said first combustion chamber. ### Claim 6 (depends on 5) The method of claim 5, which includes the step of supplying the gaseous products of combustion of said second combustion chamber to a third combustion chamber to act as a sustained high temperature environment therein and promote the burning of hazardous waste, and burning hazardous waste in said third combustion chamber at a rate substantially greater than the rate at which hazardous waste is burned in said second combustion chamber. ### Claim 7 (depends on 6) The method of claim 6, wherein said first, second and third combustion chambers are of successively larger volume. ### Claim 8 (depends on 5) The method of claim 5, wherein hazardous waste is burned in said first combustion chamber at a rate in the order of three gallons per hour. ### Claim 9 (depends on 5) The method of claim 5, wherein hazardous waste is burned in said second combustion chamber at a rate in the order of ten gallons per hour. ### Claim 10 (depends on 6) The method of claim 6, wherein hazardous waste is burned in said third combustion chamber at a rate in the order of sixty gallons per hour. ### Claim 11 (depends on 5) The method of claim 5, wherein the hazardous waste material burned in said first combustion chamber is a low viscosity liquid have relatively high heat value per unit volume. ### Claim 12 (depends on 11) The method of claim 11, wherein the hazardous waste material burned in said second combustion chamber has a heat value somewhat less than the hazardous waste which is burned in said first combustion chamber. ### Claim 13 (depends on 6) The method of claim 6, wherein the hazardous waste material burned in said third combustion chamber has a heat value somewhat less than the hazardous waste which is burned in said first and second combustion chambers. ### Claim 14 (depends on 1) The method of claim 1, which includes the step of supplying air to each of said first and second combustion chambers in an amount slightly less than that stoichiometrically required to completely burn the hazardous waste supplied to each of said chambers. ### Claim 15 (depends on 14) The method of claim 14, wherein the air supplied to at least one of said first and second chambers is preheated. ### Claim 16 (depends on 5) The method of claim 5, which includes the step of supplying air to each of said first and second combustion chambers in an amount close to the stoichiometric value, thereby to maximize the temperature within each of said chambers. ### Claim 17 (depends on 5) The method of claim 5, which includes the step of supplying air to each of said first and second combustion chambers in an amount slightly less than that stoichiometrically required to completely burn the hazardous waste supplied to each of said chambers. ### Claim 18 (depends on 16) The method of claim 16, wherein the air supplied to at least one of said first and second chambers is preheated.