Ammonia dissociation process
AssigneeKellogg Brown & Root LLC
InventorsKhoa Dang Nguyen, Umesh Jain, Paolo Brunengo, Elena Stylianou, Rohit Khurana
Life of this patent
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Abstract
A process of dissociating ammonia into a dissociated hydrogen/nitrogen stream in catalyst tubes within a radiant tube furnace and an adiabatic or isothermal unit containing catalyst, along with downstream purification process units to purify the dissociated hydrogen/nitrogen stream into high purity hydrogen product.
Claims25
A process for dissociating ammonia into hydrogen and nitrogen, comprising:
- preheating a liquid ammonia feed in a first preheater to produce a preheated liquid ammonia stream while recovering heat from a dissociated hydrogen/nitrogen stream;
- vaporizing the preheated liquid ammonia feed to produce a vaporized ammonia stream;
- dissociating at least a portion of the vaporized ammonia stream to produce the dissociated hydrogen/nitrogen stream by:
- feeding the vaporized ammonia stream to a first reactor to produce a reactor effluent;
- and
- feeding the reactor effluent to a radiant tube reactor provided in an ammonia dissociation furnace;
- and
- feeding a low-carbon fuel to the ammonia dissociation furnace from a tail gas from a pressure swing adsorption, an unpurified mixture product from an ammonia scrubber, the vaporized ammonia stream, or a combination thereof.
The process of claim 8, further comprising producing steam by recovering heat from a convection section of an ammonia dissociation furnace.
A system for dissociation of ammonia into hydrogen and nitrogen comprising:
- an ammonia dissociation furnace comprising a convection section and a radiant section;
- a preheater heat exchanger arranged to receive a liquid ammonia feed and a dissociated hydrogen/nitrogen stream, the preheater heat exchanger configured to transfer heat from the dissociated hydrogen/nitrogen stream to the liquid ammonia feed and produce a preheated ammonia stream;
- a vaporizer downstream of the preheater and configured to vaporize the preheated ammonia stream to produce a vaporized ammonia stream;
- a first reactor and configured to receive the vaporized ammonia stream, the first reactor comprising an adiabatic reactor or an isothermal unit;
- a radiant tube reactor located in the radiant section and downstream from the first reactor and configured to receive a reactor effluent from the first reactor and to output the dissociated hydrogen/nitrogen stream;
- and
- a low-carbon fuel feed to the ammonia dissociation furnace from a pressure swing adsorption, an ammonia scrubber, the vaporizer, or a combination thereof.
A system for dissociation of ammonia into hydrogen and nitrogen comprising:
- an ammonia dissociation furnace comprising a convection section and a radiant reactor section;
- an ammonia distillation reboiler section located in the convection section of the ammonia dissociation furnace, the ammonia distillation reboiler section thermally coupled to an ammonia distillation unit and comprising one or more coils configured to recover heat from the convection section of the ammonia dissociation furnace;
- an adiabatic reactor comprising one or more catalysts to dissociate ammonia and a reactor effluent;
- one or more radiant tubes located in the radiant reactor section of the ammonia dissociation furnace configured to receive the reactor effluent from the adiabatic reactor and output a dissociated hydrogen/nitrogen stream.
A system for dissociation of ammonia into hydrogen and nitrogen comprising:
- an isothermal unit and configured to receive a vaporized ammonia stream and to recover heat from a dissociated hydrogen/nitrogen stream;
- and
- a radiant tube reactor downstream the isothermal unit configured to receive a reactor effluent from the isothermal unit and to output the dissociated hydrogen/nitrogen stream.
A process for dissociating ammonia into hydrogen and nitrogen, comprising:
- feeding a vaporized ammonia stream to an adiabatic reactor comprising one or more catalysts to dissociate ammonia;
- feeding an effluent reactor stream of the adiabatic reactor to one or more radiant tubes located in a radiant reactor section of an ammonia dissociation furnace to produce a dissociated hydrogen/nitrogen stream, wherein the ammonia dissociation furnace comprises a convection section;
- and
- transferring heat from the convection section of the ammonia dissociation furnace to an ammonia distillation unit.
A process for dissociating ammonia into hydrogen and nitrogen, comprising:
- dissociating ammonia from a vaporized ammonia stream in isothermal conditions to produce a reactor effluent while recovering heat from a dissociated hydrogen/nitrogen stream;
- and
- feeding the reactor effluent to a radiant tube reactor to dissociate ammonia present in the reactor effluent to output the dissociated hydrogen/nitrogen stream.
Dependencies are inferred from the claim text.