NOVELTY - An oxycombustion system with thermally integrated ammonia synthesis, comprises: an air separation unit that separates an air feed stream into an oxygen stream and a nitrogen stream; an ammonia synthesis unit that synthesizes ammonia from a hydrogen feed stream and the nitrogen stream; an ammonia separation unit that condenses at least a portion of the crude ammonia stream; an oxycombustion reactor; and at least one thermal integration.    USE - The oxycombustion system and method are useful for performing oxycombustion with thermally integrated ammonia synthesis (claimed).    ADVANTAGE - The oxycombustion system is energy and cost-efficient, and operates with increased energy efficiency and produces fewer harmful emissions of greenhouse gases such as carbon dioxide and pollutants such as nitrogen oxide (NOx), and/or sulfur oxide (Sox).    DETAILED DESCRIPTION - An oxycombustion system with thermally integrated ammonia synthesis, comprises: an air separation unit that separates an air feed stream into an oxygen stream and a nitrogen stream; an ammonia synthesis unit that synthesizes ammonia from a hydrogen feed stream and the nitrogen stream from the air separation unit to form a crude ammonia stream containing the ammonia and, optionally, unreacted nitrogen and hydrogen; an ammonia separation unit that condenses at least a portion of the crude ammonia stream formed in the ammonia synthesis unit and separates the ammonia from any unreacted nitrogen and hydrogen to form a purified ammonia stream; an oxycombustion reactor that combusts a fuel from a fuel feed stream in the presence of the oxygen stream from the air separation unit to produce combustion heat; and at least one thermal integration chosen from a reactor thermal linkage of the ammonia synthesis unit with the oxycombustion reactor, a separator thermal linkage of the air separation unit with the ammonia separation unit, or both. An INDEPENDENT CLAIM is included for a method for performing oxycombustion with thermally integrated ammonia synthesis, which involves: separating an air feed stream with an air separation unit into an oxygen stream and a nitrogen stream; flowing the oxygen stream to an oxycombustion reactor; flowing the nitrogen stream to an ammonia synthesis unit; combining the nitrogen stream in the ammonia synthesis unit with a hydrogen feed stream to synthesize ammonia and form a crude ammonia stream containing the ammonia and, optionally, unreacted nitrogen or hydrogen; condensing at least a portion of the crude ammonia stream in an ammonia separation unit; separating the ammonia in the crude ammonia stream from any unreacted nitrogen or hydrogen in the crude ammonia stream, to form a purified ammonia stream; combining a fuel from a fuel stream with the oxygen stream to form a fuel mixture; combusting the fuel mixture in the oxycombustion reactor to generate combustion heat; and transferring thermal energy through at least one thermal integration while the fuel mixture is being combusted and the ammonia is being synthesized, the thermal integration chosen from a reactor thermal linkage of the ammonia synthesis unit with the oxycombustion reactor, a separator thermal linkage of the air separation unit with the ammonia separation unit, or both.