Systems and methods for exchanging heat in a gasification system

A method for cooling a syngas, comprising:

• introducing one or more particulates and a heat transfer medium comprising a feed water, a deaerated feed water, or a combination thereof, to a first zone;
• indirectly exchanging heat from the one or more particulates to the heat transfer medium within the first zone to provide an intermediate heat transfer medium and cooled particulates;
• introducing at least a portion of the intermediate heat transfer medium and a syngas to a second zone;
• and
• indirectly exchanging heat from the syngas to the intermediate heat transfer medium within the second zone to provide a heat transfer medium product and a cooled syngas, wherein the heat transfer medium product comprises steam, wherein the heat transfer medium comprises deaerated feed water at a pressure of about 300 kPa to about 6,000 kPa at a temperature of about 25° C. to about 150° C., wherein the intermediate heat transfer medium is at a pressure of about 300 kPa to about 5,000 kPa and a temperature of about 100° C. to about 160° C., and wherein the heat transfer medium product is at a pressure of about 3,000 kPa to about 6,500 kPa and a temperature of about 350° C. to about 650° C.

A method for cooling a syngas, comprising:

• introducing one or more particulates and a heat transfer medium comprising a feed water, a deaerated feed water, or a combination thereof, to a first zone;
• indirectly exchanging heat from the one or more particulates to the heat transfer medium within the first zone to provide an intermediate heat transfer medium and cooled particulates;
• introducing at least a portion of the intermediate heat transfer medium and a syngas to a second zone;
• and
• indirectly exchanging heat from the syngas to the intermediate heat transfer medium within the second zone to provide a heat transfer medium product and a cooled syngas, wherein the heat transfer medium product comprises steam, wherein the intermediate heat transfer medium is at a temperature of about 100° C. to about 160° C. and a pressure of about 300 kPa to about 5.000 kPa, and wherein the cooled particulates is at a temperature of about 150° C. to about 250° C. and a pressure of about 300 kPa to about 4,000 kPa.

A method for cooling a syngas, comprising:

• introducing one or more particulates and a heat transfer medium comprising a feed water, a deaerated feed water, or a combination thereof, to a first zone;
• indirectly exchanging heat from the one or more particulates to the heat transfer medium within the first zone to provide an intermediate heat transfer medium and cooled particulates;
• introducing at least a portion of the intermediate heat transfer medium and a syngas to a second zone;
• and
• indirectly exchanging heat from the syngas to the intermediate heat transfer medium within the second zone to provide a heat transfer medium product and a cooled syngas, wherein the heat transfer medium product comprises steam, wherein the syngas is at a temperature of about 750° C. to about 1,250° C. and a pressure of about 300 kPa to about 5,000 kPa, and wherein the heat transfer medium product is at a temperature of about 350° C. to about 650° C. and a pressure of about 3,000 kPa to about 6,500 kPa, and wherein the cooled syngas is at a temperature of about 200° C. to about 600° C. and a pressure of about 300 kPa to about 5,000 kPa.

A method for cooling a syngas, comprising:

• introducing a first portion of a heat transfer medium comprising a feed water, a deaerated feed water, or a combination thereof, to a first particulate cooler within a first zone and a second portion of the heat transfer medium to a second particulate cooler within the first zone;
• introducing one or more first particulates to the first particulate cooler and one or more second particulates to the second particulate cooler, wherein the first particulates comprise coarse ash particles and the second particulates comprise fine ash particles;
• indirectly exchanging heat within the first cooler from the one or more first particulates to the first portion of the heat transfer medium to produce a heated first portion of the heat transfer medium;
• indirectly exchanging heat within the second cooler from the one or more second particulates to the second portion of the heat transfer medium to produce a heated second portion of the heat transfer medium;
• combining the heated first portion of the heat transfer medium and the heated second portion of the heat transfer medium to produce an intermediate heat transfer medium;
• introducing the intermediate heat transfer medium and a syngas to a syngas cooler;
• and
• indirectly exchanging heat within the syngas cooler to produce a heat transfer medium product comprising high pressure superheated steam at a pressure of about 300 kPa to about 6,500 kPa and a temperature of about 300° C. to about 650° C. and a cooled syngas.