Heat integration and condensate treatment in a shift feed gas saturator

A process for producing syngas, comprising the steps of:

• gasifying one or more carbonaceous feedstocks at conditions sufficient to provide a syngas having a first hydrogen to carbon monoxide ratio;
• splitting the syngas to provide at least a first portion of syngas and a second portion of syngas;
• adding water to the first portion to provide an at least partially saturated syngas having a water vapor to syngas ratio less than 1.0;
• converting at least a portion of carbon monoxide in the at least partially saturated syngas to carbon dioxide to provide condensed water and a shifted syngas, the first portion of syngas having the first hydrogen to carbon monoxide ratio and a first temperature, and the shifted syngas having a second hydrogen to carbon monoxide ratio and a second temperature, both greater than the first;
• at least partially vaporizing the condensed water using heat from the conversion step or heat from the second portion of the syngas or both;
• separating one or more contaminants from the at least partially vaporized condensed water to produce a contaminant-lean water;
• at least partially saturating the first portion of the syngas with the contaminant-lean water;
• gasifying the one or more separated contaminants to produce additional syngas;
• and
• combining the shifted syngas with the second portion of the syngas to provide a product gas containing a hydrogen to carbon monoxide ratio greater than the first.

A process for producing syngas, comprising:

• splitting a syngas to provide at least a first portion of syngas and a second portion of syngas;
• adding water to the first portion of syngas to provide an at least partially saturated syngas having a water vapor to syngas ratio less than 1.0;
• converting at least a portion of carbon monoxide in the at least partially saturated syngas to carbon dioxide to provide a shifted syngas and condensed water, the first portion of syngas having a first hydrogen to carbon monoxide ratio and a first temperature, and the shifted syngas having a second hydrogen to carbon monoxide ratio and a second temperature, both greater than the first;
• at least partially vaporizing the condensed water by heating the condensed water with indirect heat exchange from the second portion of syngas, and wherein heating the condensed water with indirect heat exchange from the second portion of syngas condenses water from the second portion of syngas;
• combining the condensed water produced by converting at least a portion of the carbon monoxide in the at least partially saturated syngas with the condensed water from the second portion of the syngas;
• selectively removing one or more contaminants from the combined condensate;
• returning at least a portion of the combined condensate to the first portion of the syngas;
• combining the shifted syngas with the second portion of syngas to provide a product gas;
• and
• recycling the one or more removed contaminants to a hydrocarbon gasifier for the production of additional syngas.