Method and plant for generation of synthesis gas

A composite plant for generation of synthesis gas, the composite plant comprising the following component plants:

• a. a first component plant configured to fractionate air using an air fractionation plant that works by the principle of cryogenic rectification under elevated pressure, suitable for generating a stream of gaseous oxygen and a stream of gaseous nitrogen at elevated pressure and ambient temperature, and a tail gas stream:
• b. a second component plant configured to convert a carbonaceous fuel with a gasifying agent to give a synthesis gas comprising mainly hydrogen and carbon monoxide, wherein first component plant and second component plant are connected such that the oxygen generated in component plant a) can be added to the gasifying agent used in component plant b),
• c. a third component plant for removal of the acid gases carbon dioxide and hydrogen sulfide from the crude synthesis gas generated in second component plant by absorption at low temperature with a liquid absorbent, wherein the third component plant further comprises a compression refrigeration plant,
• wherein the composite plant comprises an expansion turbine by means of which the nitrogen stream generated in the first component plant can be expanded and simultaneously cooled, and a heat exchanger for the heat exchange between said expanded nitrogen stream and the liquid absorbent used in the third component plant or with a coolant of the compression refrigeration plant,
• wherein the plant comprises a second turbine by means of which the nitrogen stream, after it has expanded in the first turbine and exchanged heat in the heat exchanger with the liquid absorbent or the coolant, can be expanded further, and in that this heat exchanger is designed such that simultaneous heat exchange between the liquid absorbent or the coolant therein, the nitrogen stream after it has expanded in the first turbine and the nitrogen stream after it has expanded in the second turbine, is possible.

A composite plant for generation of synthesis gas, the composite plant comprising the following component plants:

• a. a first component plant configured to fractionate air using an air fractionation plant that works by the principle of cryogenic rectification under elevated pressure, suitable for generating a stream of gaseous oxygen and a stream of gaseous nitrogen at elevated pressure and ambient temperature, and a tail gas stream,
• b. a second component plant configured to convert a carbonaceous fuel with a gasifying agent to give a synthesis gas comprising mainly hydrogen and carbon monoxide, wherein first component plant and second component plant are connected such that the oxygen generated in component plant a) can be added to the gasifying agent used in component plant b),
• c. a third component plant for removal of the acid gases carbon dioxide and hydrogen sulfide from the crude synthesis gas generated in second component plant by absorption at low temperature with a liquid absorbent, wherein the third component plant further comprises a compression refrigeration plant,
• wherein the composite plant comprises an expansion turbine by means of which the nitrogen stream generated in the first component plant can be expanded and simultaneously cooled, and a heat exchanger for the heat exchange between said expanded nitrogen stream and the liquid absorbent used in the third component plant or with a coolant of the compression refrigeration plant,
• wherein the plant additionally comprises a compression turbine for compression of the tail gas stream which is driven by the expansion turbine that serves to expand the nitrogen stream, wherein the plant further comprises a heat exchanger for cooling the compressed tail gas stream with cooling water and an expansion turbine for expansion of the tail gas stream, and wherein the plant further comprises a heat exchanger having two pathways for the tail gas stream and one pathway for the nitrogen stream, and wherein the heat exchanger for the heat exchange between the nitrogen stream and the absorbent or the coolant additionally comprises a pathway for the tail gas stream.