Methods and systems for cooling hot particulates

A method for cooling particulates, comprising:

• gasifying a carbonaceous material in the presence of one or more oxidants to provide ash and a raw synthesis gas comprising hydrogen and carbon monoxide;
• introducing at least a portion of the ash and water to a first vessel to provide a first dense bed of particulates;
• cooling the first dense bed of particulates in the first vessel to obtain first cooled particulates;
• recovering the first cooled particulates from the first vessel;
• introducing at least a portion of the first cooled particulates to a second vessel comprising an elongated shell having a first end, a second end, and one or more sidewalls, wherein the first cooled particulates are introduced through a particulate inlet disposed in the one or more sidewalls and second cooled particulates exit the second vessel through a particulate outlet disposed on the second end;
• introducing a coolant to a tube bundle disposed within the second vessel, wherein the tube bundle comprises a plurality of tubulars, wherein the tubulars each have an open first end secured to a first tube sheet and a closed second end, wherein an inner conduit is concentrically placed within each of the tubulars, wherein the inner conduit has an open first end secured to a second tube sheet and an open second end disposed adjacent the closed second end, and wherein the coolant enters the tube bundle through a coolant inlet adjacent the first end;
• recovering a heated coolant from a coolant outlet disposed in the one or more sidewalls between the first tube sheet and the second tube sheet for discharging the heated coolant;
• flowing the first cooled particulates through a shell side of the vessel resulting in a second dense bed of particulates and contacting the second dense bed of particulates with the tube bundle;
• introducing an aeration gas into the vessel from one or more aeration nozzles located within the second vessel between the second end and the tube bundle, wherein the aeration gas is directed toward the tube bundle;
• venting at least a portion of the aeration gas via an aeration gas vent line disposed on the one or more sidewalls at a location between the particulate inlet and the first tube sheet;
• and
• recovering second cooled particulates from the particulate outlet disposed on the second end of the second vessel.

A system for cooling particulates, comprising:

• a gasifier in fluid communication with a raw syngas line and a particulate removal line;
• a first vessel in fluid communication with the particulate removal line, the first vessel comprising one or more water injection nozzles and one or more first aeration nozzles;
• a particulate transfer line in fluid communication with the first vessel and a second vessel, the second vessel comprising:
• an elongated shell having a first end, a second end, and one or more sidewalls;
• a shell side particulate inlet in fluid communication with the particulate transfer line and disposed in the one or more sidewalls for receiving particulates;
• a shell side particulate outlet disposed adjacent the second end for discharging cooled particulates, wherein a narrowing member is situated between the second end and the particulate outlet;
• a tube side fluid inlet adjacent the first end for receiving a coolant;
• a tube bundle comprising a plurality of tubulars, wherein the tubulars each have an open first end secured to a first tube sheet and a closed second end, and wherein an inner conduit is concentrically placed within each of the tubulars, the inner conduit having an open first end secured to a second tube sheet and an open second end disposed adjacent to the closed second end;
• a coolant outlet disposed in the one or more sidewalls between the first tube sheet and the second tube sheet for discharging heated coolant and a coolant inlet disposed adjacent to the first end for receiving coolant;
• one or more second aeration nozzles disposed between the second end of the vessel and the tube bundle for directing a second aeration fluid toward the tube bundle;
• and
• one or more third aeration nozzles disposed on a sidewall of the narrowing member for directing a third aeration gas toward the particulate outlet.