Burner for the partial oxidation of slurries of solid carbonaceous fuels

A burner for mixing together separate feed streams comprising a pumpable slurry stream comprising in the range of about 30 to 75 wt.% solid carbonaceous fuel in a liquid carrier and a stream of free-oxygen containing gas optionally in admixture with a temperature moderator to produce a multiphase mixture and introducing said multiphase mixture into a partial oxidation gas generator comprising:

• a retracted central conduit coaxial with the central longitudinal axis of the burner and having an upstream inlet through which a first feedstream may be separately introduced, and a downstream discharge outlet;
• an outer coaxial conduit concentric with said central conduit and having an upstream inlet through which a second feedstream may be separately introduced, and an exit nozzle coaxial with and terminating said outer conduit at the downstream tip of the burner comprising a converging frusto-conical rear portion and a right cylindrical front portion which terminates at the downstream face of the burner, and the height of the front cylindrical portion of said exit nozzle is in the range of about 0.1 to 1.0 times its own diameter;
• a coaxial annular shaped cooling chamber surrounding said exit nozzle at the burner tip;
• wherein said central conduit discharge outlet is retracted upstream from the downstream face of the burner a distance of two or more times the minimum diameter of said outer conduit downstream exit nozzle to provide a pre-mix zone wherein intimate mixing together of the feedstreams takes place and a controlled amount of the liquid carrier in the range of about 0 to 100 vol.% is vaporized without burning, said pre-mix zone comprising at least two cylindrically shaped communicating pre-mix chambers in tandem and coaxial with the central longitudinal axis of said burner, and wherein each pre-mix chamber except for the first chamber in the line comprises a coaxial cylindrical body inlet portion and a coaxial at least partially converging frusto-conical outlet portion that may optionally develop into a straight cylindrical portion and the first pre-mix chamber in the line has a converging inlet portion, and a straight coaxial cylindrical body portion that discharges through a circular orifice directly into the next in line coaxial pre-mix chamber;
• and means for radially spacing said central and outer conduits from each other to provide a coaxial annular passage through which said second feedstream may separately pass concurrently with said first feedstream into said pre-mix zone where said multiphase mixture is produced prior to being discharged through said outer conduit exit nozzle.

A burner for introducing a multiphase mixture of feedstreams including a pumpable slurry feedstream of solid carbonaceous fuel in a liquid carrier in liquid phase, a feedstream of free-oxygen containing gas optionally in admixture with steam, and a gaseous feedstream into the reaction zone of a partial oxidation gas generator comprising:

• a retracted central conduit coaxial with the central longitudinal axis of the burner and having an upstream inlet through which a first or second feedstream may be separately introduced, and a circular downstream discharge outlet;
• an outer coaxial conduit concentric with said central conduit and having an upstream inlet through which a third feedstream is introduced and a converging exit nozzle terminating said outer conduit and comprising a frusto-conical shaped rear portion and a right cylindrical shaped front portion which terminates at the downstream face of the burner, and the height of the front cylindrical portion of said exit nozzle is in the range of about 0.1 to 1.0 times its own diameter and a coaxial annular shaped cooling chamber surrounding said exit nozzle at the burner tip;
• and said central conduit discharge outlet is retracted upstream from the downstream face of the burner a distance of two or more times the minimum diameter of said outer conduit downstream exit nozzle to provide a pre-mix zone comprising at least one cylindrically shaped pre-mix chamber coaxial with the central longitudinal axis of said burner;
• an intermediate coaxial conduit concentric with said central conduit and having an upstream inlet through which the remaining one of said first and second feedstreams may be introduced, and a converging at least partially frusto-conical shaped downstream exit nozzle terminating said intermediate conduit, and the tip of said intermediate conduit exit nozzle is retracted upstream from the downstream face of the burner a distance of 0 to 12 times the minimum diameter of said outer conduit downstream exit nozzle;
• and means for radially spacing said central, intermediate, and outer conduits with respect to each other to provide intermediate and outer coaxial annular passages, and said intermediate annular passage is situated between the outside diameter of the central conduit and the inside diameter of the intermediate conduit and is the passage through which said first or second feedstream may separately pass concurrently with the feedstream passing through the central conduit into said pre-mix zone where a multiphase mixture of feedstreams is produced and at least a portion of said liquid carrier is vaporized without burning, and said outer annular passage is situated between the outside diameter of said intermediate conduit and the inside diameter of said outer conduit and is the passage through which said third feedstream may separately pass concurrently with the other two feedstreams and then mix with said multiphase mixture of feedstreams.

A burner for mixing together three separate feedstreams including a pumpable slurry feedstream of solid carbonaceous fuel in a liquid carrier in liquid phase, a feedstream of free-oxygen containing gas optionally in admixture with steam, and a gaseous feedstream and introducing the resulting multiphase mixture into a partial oxidation gas generator comprising:

• a central conduit coaxial with the central longitudinal axis of the burner and having an upstream inlet through which a first feedstream may be introduced and a circular downstream discharge outlet, an outer coaxial conduit concentric with said central conduit and having an upstream inlet through which a third feedstream is introduced and a converging exit nozzle terminating said outer conduit and comprising a frusto-conical shaped rear portion and a right cylindrical shaped front portion which terminates at the downstream face of the burner and a coaxial annular shaped cooling chamber surrounding said exit nozzle at the burner tip, and said central conduit discharge outlet is retracted upstream from the downstream face of the burner a distance of 3 to 10 times the minimum diameter of said outer conduit downstream exit nozzle to provide a pre-mix zone comprising 2 to 5 cylindrically shaped pre-mix chambers in tandem and coaxial with the central longitudinal axis of said burner, and wherein each pre-mix chamber except for the first chamber in the line comprises a coaxial cylindrical body inlet portion and a coaxial at least partially converging frusto-conical outlet portion that may optionally develop into a straight cylindrical portion and the first pre-mix chamber in the line has a converging inlet portion and a straight coaxial cylindrical body portion that discharges through a circular orifice directly into the next in line coaxial pre-mix chamber;
• an intermediate coaxial conduit concentric with said central conduit and having an upstream inlet through which a second feedstream may be introduced, and a converging at least partially frusto-conical shaped downstream exit nozzle terminating said intermediate conduit, and the tip of said intermediate conduit exit nozzle is retracted upstream from the downstream face of the burner a distance of 1 to 5 times the minimum diameter of said outer conduit downstream exit nozzle;
• and means for radially spacing said central, intermediate, and outer conduits with respect to each other to provide intermediate and outer coaxial annular passages, and said intermediate annular passage is situated between the outside diameter of the central conduit and the inside diameter of the intermediate conduit and is the passage through which said second feedstream may separately pass concurrently with said first feedstream into said pre-mix zone where a multiphase mixture of said first and second feedstreams is produced and from 0 to 100 vol.% of said liquid carrier is vaporized without burning, and said outer annular passage is situated between the outside diameter of said intermediate conduit and the inside diameter of said outer conduit and is the passage through which said third feedstream may separately pass concurrently with said first and second feedstreams and then mix with said multiphase mixture of said first and second feedstreams upstream from the downstream face of the burner.