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US 8,707,875 B2Granted
Gasification combustion system
AssigneeCovanta Energy Corporation
InventorsRon Broglio, Hanwei Zhang
Life of this patent
Estimating the term…
Abstract
A two stage refuse gasification combustion system for processing refuse is disclosed. The system may contain features such as an advancer, a first and second gasifier, a gas regulator, and a post combustor. Additionally, methods for regulating gas and advancing refuse through a two stage refuse gasification combustion system are disclosed.
Claims24
A two stage refuse gasification combustion system for processing refuse, said system comprising:
- an advancer, a first and second gasifier, a first gas regulator, and a post combustor:
- a. said advancer extending from the first gasifier to the second gasifier for moving the refuse from the first gasifier to the second gasifier;
- b. said post combustor comprising a connection to the first and second gasifier;
- and
- c. said first gas regulator comprising:
- an input port for receiving gas;
- an output port for outputting gas;
- valves for regulating gas flow in the system;
- control software to allow the regulator to control opening and closing of the valves which regulate how much gas flows into the input port and how much gas flows out of the output port;
- d. a central controller containing software for causing the controller to perform the steps of controlling a speed of the advancer;
- controlling a flow rate of gas through a first and second gas splitter;
- and controlling a positioning of the valves in the first gas regulator.
9 more elements
A two stage refuse gasification combustion system for processing refuse, said system comprising:
- an advancer, a first and second gasifier, a first gas regulator, and a post combustor:
- a. said advancer extending from the first gasifier to the second gasifier for moving the refuse from the first gasifier to the second gasifier;
- b. said post combustor comprising a connection to the first and second gasifier;
- and
- c. said first gas regulator comprising:
- an input port for receiving gas;
- an output port for outputting gas;
- valves for regulating gas flow in the system;
- control software to allow the regulator to control opening and closing of the valves which regulate how much gas flows into the input port and how much gas flows out of the output port;
- d. a controller containing software stored on a computer readable medium and a microprocessor for executing the software, said software containing an instruction set for causing the controller to
- i. regulate and control the amount of oxygen in the first gasifier, the second gasifier, and the post combustor, thereby controlling temperature and speed of combustion of the refuse and gases, allowing the system to reduce production of nitrous oxide;
- and
- ii. instruct a first gas splitter to send gas having a low oxygen content to the first gasifier through a second gas splitter.
10 more elements
A two stage refuse gasification combustion system for processing refuse, said system comprising:
- an advancer, a first and second gasifier, a first gas regulator, and a post combustor:
- a. said advancer extending from the first gasifier to the second gasifier for moving the refuse from the first gasifier to the second gasifier;
- b. said post combustor comprising a connection to the first and second gasifier;
- and
- c. said first gas regulator comprising a plurality of input and output ports including:
- i. a first input port for receiving gas from the second gasifier;
- ii. a second input port for receiving gas from a second gas regulator;
- iii. a first output port connected to a lower portion of a sidewall of the post combustor for directing gas horizontally into the post combustor;
- iv. a second output port connected to an upper portion the sidewall of the post combustor for directing gas horizontally into the post combustor;
- and
- v. a third output port connected to a top portion of the post combustor for directing gas downwardly into the post combustor;
- d. and wherein the system comprises valves for regulating gas flow in the system;
- and control software to allow the regulator to control opening and closing of the valves which regulate how much gas flows into the input ports and how much gas flows out of the output ports.
10 more elements
A two stage refuse gasification combustion system for processing refuse, said system comprising:
- an advancer, a first and second gasifier, a first gas regulator, and a post combustor:
- a. said advancer extending from the first gasifier to the second gasifier for moving the refuse from the first gasifier to the second gasifier;
- b. said post combustor comprising a connection to the first and second gasifier;
- and
- c. said first gas regulator comprising:
- an input port for receiving gas;
- an output port for outputting gas;
- valves for regulating gas flow in the system;
- and control software to allow the regulator to control opening and closing of the valves which regulate how much gas flows into the input port and how much gas flows out of the output port;
- d. a first gas hopper fluidly connected to a first gas splitter and the first gasifier, said first gas splitter connectable to a gas source for receiving gas external from the system;
- said first gasifier comprising a sloped top for directing gas into the post combustor;
- e. a flue connected to the post combustor, said flue comprising a valve operable to allow gas to escape the system when the valve is in a first position or cause at least some of the gas to recirculate when in a second position;
- f. a second gas regulator for directing gas through the system, said second gas regulator comprising:
- a connection with the flue to receive recirculated gas from the flue;
- a controller to control the position of the flue valve;
- a connection to the gas source to allow the second gas regulator to receive gas external from the system;
- a gas output connected to the first gas regulator to direct gas into the first gas regulator;
- and
- a valve and valve controller to control how much gas from the flue and the gas source flows through the gas output.
16 more elements
Dependencies are inferred from the claim text.