| 主权项 |
1. A process for producing a hydrogen product gas, the process comprising:
(a) withdrawing a reformate from a shift reactor, the reformate comprising H2O, H2, CO, and CO2; (b) heating a water condensate in a first heat exchange section by indirect heat transfer with the reformate from the shift reactor or a first divided portion thereof, the water condensate heated from a lower temperature, TWC,lower, to an upper temperature, TWC,upper, when being heated by the reformate or the first divided portion, and the reformate or first divided portion cooled from an upper temperature, T1,upper, to a lower temperature, T1,lower, when heating the water condensate; (c) heating boiler feed water withdrawn from a deaerator in a second heat exchange section by indirect heat transfer with the reformate from the shift reactor or a second divided portion thereof, the boiler feed water heated from a lower temperature, TBFW,lower, to an upper temperature, TBFW,upper, when being heated by the reformate or the second divided portion, and the reformate or second divided portion cooled from an upper temperature, T2,upper, to a lower temperature, T2,lower, when heating the boiler feed water;
where TWC,lower, TBFW,lower, T1,lower, and T2,lower, are less than the dewpoint temperature of the reformate withdrawn from the shift reactor; and TWC,upper, TBFW,upper, T1,upper, and T2,upper, are greater than the dewpoint temperature of the reformate withdrawn from the shift reactor; (d) cooling a mixture comprising at least a portion of the reformate when the reformate heats the water condensate and the boiler feed water or comprising at least a portion of the first divided portion and at least a portion of the second divided portion when the first divided portion heats the water condensate and the second divided portion heats the boiler feed water, the mixture cooled in an amount effective to condense at least a portion of the water in the mixture to form condensed water and a water-depleted reformate gas; (e) separating the condensed water from the water-depleted reformate gas in a separator thereby forming the water condensate from at least a portion of the condensed water; (f) passing the water condensate from the separator to the first heat exchange section for the step of heating the water condensate by indirect heat transfer with the reformate or the first divided portion, and passing at least a portion of the water condensate from the first heat exchange section to a steam drum; and (g) separating a pressure swing adsorption unit feed comprising at least a portion of the water-depleted reformate gas in a pressure swing adsorption unit to form the hydrogen product gas and a pressure swing adsorption unit by-product gas. |
