Method and plant for producing an ammonia product

Abstract

The invention relates to a method for producing an ammonia product, wherein a synthesis reactor (120) is used which comprises a plurality of catalyst beds (121, 122, 123) which are arranged one behind the other in a flow direction in the synthesis reactor (120), wherein a first gas mixture containing nitrogen and hydrogen is supplied to the synthesis reactor (120) and a second gas mixture containing nitrogen, hydrogen and ammonia is withdrawn, wherein, downstream of the last catalyst bed (123) in the flow direction, a terminal heat exchanger (126) is provided inside the synthesis reactor (120), and the terminal heat exchanger (126) is operated at least intermittently using an adjustable proportion of the first gas mixture to cool the second gas mixture. According to the invention, the proportion of the first gas mixture which is used at least intermittently for cooling the second gas mixture is set in accordance with a control device (106, 206), and the control device (106, 206) is operated with a control variable which is selected from: a temperature at an inlet to the last catalyst bed (123) in the flow direction; or a difference between the temperature at the inlet into the last catalyst bed (123) in the flow direction and a temperature at an outlet of a first catalyst bed (121), in the flow direction, of the catalyst beds (121, 122, 123). The invention also relates to a corresponding plant (100, 200).

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