System and method for cooling syngas produced from a gasifier

A gas turbine engine system comprising:

• a compressor;
• a combustor in flow communication with said compressor to receive at least some of the air discharged by said compressor;
• and
• a syngas cooler coupled in flow communication with said combustor for channeling a flow of syngas to said combustor, said syngas cooler comprising:
• an outer wall defining a cavity;
• a inner membrane water wall positioned within said cavity;
• a outer membrane water wall substantially concentrically aligned with said inner membrane water wall, such that said outer membrane water wall is positioned between said inner membrane water wall and said outer wall;
• at least one half pipe having a semicircular cross-section directly coupled to an inner surface of said outer membrane water wall;
• and
• a thermal siphon positioned between said inner membrane water wall and said outer wall, said thermal siphon configured to channel the syngas therethrough to facilitate cooling the channeled syngas.

A method for cooling syngas produced in a gasifier and separating slag and particulate matter from the syngas, the method comprising:

• surrounding a flow of syngas with three concentric, vertically oriented membrane water walls inside a syngas cooling unit;
• channeling cooling fluid through the three concentric membrane water walls;
• passing the syngas down through a first of the three membrane water walls to partially cool the syngas and separate slag and particulate matter from the syngas;
• and
• utilizing a thermal siphon to pass the partially cooled syngas up between the first of the three membrane water walls and a second of the three membrane water walls and then down between the third of the three membrane water walls and the second of the three membrane water walls to produce cooled output syngas;
• wherein at least one half pipe having a semicircular cross-section is directly coupled to an inner surface of said third membrane water wall.