Verfahren und System zur Regeneration eines Trockners in einer Synthesegastrockneranordnung in einer Ammoniakherstellungsanlage

Details

Veröffentlichungs-Nr.

EP4806841

Anmeldetag

11. März 2025

Veröffentlichung

16. September 2026

Rechtsraum

EP

Abstract

The present disclosure provides a process for regenerating a dryer of a syngas dryer assembly comprising one or more dryers in an ammonia plant (100), the process comprising steps of: (i) contacting a charge of desulphurized natural gas (1) and steam (2), with air, oxygen-enriched air or oxygen, in a conversion section resulting in a synthesis gas comprising hydrogen, CO and CO<2>, the conversion section comprising at least one furnace; (ii) subjecting the synthesis gas obtained in step (i) to shift conversion, carbon dioxide removal and methanation, thereby obtaining a stream of treated syngas (7') and further passing the treated syngas (7') through a first syngas compressor (8) to obtain a compressed syngas (8'); (iii) introducing the compressed syngas (8') to a first dryer (9) of the syngas dryer assembly, located downstream of the first syngas compressor (8) to absorb water resulting in a dried make-up syngas, wherein the syngas dryer assembly further comprises a second dryer (14) positioned in parallel to the first dryer (9), wherein the second dryer is a saturated dryer requiring regeneration, wherein a part of the dried make-up syngas (9") is compressed in a second syngas compressor (10) to provide a compressed make-up syngas (10') that is further supplied to an ammonia synthesis loop (11) forming ammonia (11') and generating a purge gas (11") comprising hydrogen, ammonia, methane and argon; and (iv) introducing the purge gas (11") to a purge gas recovery unit (12), whereby ammonia and hydrogen are recovered and a reject gas (12') is generated, wherein a part of the reject gas (12a) is introduced to a third dryer (13) positioned in series to the second dryer (14) resulting in a dried reject gas (13'), wherein a part of the dried reject gas (13') is supplied to the second dryer (14), located downstream of the third dryer (13), thereby regenerating the second dryer (14) and resulting in a used reject gas (14'). The disclosure further provides a plant for producing ammonia, the use of a reject gas emerging from the purge gas recovery unit in the ammonia plant to perform the process of the disclosure and a method of revamping the ammonia plant.

Anmelder

Firma

Yara International ASA

Land

🇳🇴 Norwegen