Ammonia synthesis reactor

Abstract

The invention discloses an ammonia synthesis reactor which comprises an ammonia reactor, a steam drum, a boiler feed water heater and a hot water pump, the ammonia reactor is provided with an ammonia reactor outer cylinder, and an ammonia reactor internal part is arranged in the ammonia reactor outer cylinder; the ammonia reactor internals comprise a first-stage heat insulation catalyst bed layer, a first-stage interlayer heat exchanger, a second-stage heat insulation catalyst bed layer, a second-stage interlayer heat exchanger and a last-stage catalyst bed layer which are sequentially connected from top to bottom, and a water heat transfer heat exchanger is arranged in the last-stage catalyst bed layer; the boiler feed water pipe is communicated with the boiler feed water heater, and the boiler feed water heater is communicated with the steam pocket through a steam pocket water supplementing pipe; according to the invention, the reaction heat of the last-stage catalyst bed is timely removed by water in the water heat transfer tube bundle buried in the catalyst bed, and 12.0 MPa saturated steam is produced as a byproduct, so that the reaction heat of the catalyst bed is not gathered and accumulated, the temperature of the catalyst bed is always controlled at-340 DEG C and is far away from an equilibrium curve, and the ammonia content at the outlet of the bed is 41.53%.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to an ammonia synthesis reactor. Background technique [0002] At present, the existing large-scale low-pressure (15.0MPa) ammonia synthesis reactors of ammonia synthesis technology suppliers at home and abroad are all three-stage adiabatic catalyst beds, and interlayers are used between the first and second adiabatic beds and between the second and third adiabatic beds. The gas-gas heat exchanger removes the heat at the outlet of the adiabatic section to ensure that the gas temperature at the inlet of the next-stage adiabatic catalyst bed is ≤380°C, and the high-temperature synthesis gas at the outlet of the third-stage adiabatic catalyst bed directly enters the direct-connected waste heat boiler, and the by-product is saturated at 3.8MPa steam. [0003] The existing ammonia synthesis reactor operates under the parameters of the best operating parameters, and the net va...

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Problems solved by technology

[0004] The existing ammonia synthesis reactor adopts the method of direct connection between the waste heat boiler and the outlet gas of the three-stage bed of the ammonia synthesis reactor. This structure corresponds to the adiabatic catalyst bed and cannot guarantee that the catalyst bed, especially the final catalyst bed, can synthesize ammonia under isothermal conditions. reaction

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