Ammonia Plant Upgrading-Multistage Integrated Chilling of Process Air Compressor with Ammonia Compressor Followed by Air Flow Split and Multistage Air Preheating to Secondary Ammonia Reformer
First Claim
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1. An upgrade to an existing ammonia plant utilizing a new indirect multistage chilling system in an existing ammonia plant air compression train of the existing ammonia plant to increase process air flow to an existing secondary ammonia reformer of the existing ammonia plant comprising:
- a. a new two stage suction air chiller in the existing ammonia plant air compression train that chills incoming process air by heat exchange with chilled water from an existing ammonia compression system;
b. additional new two stage air chillers between each of the existing air compressors of the existing ammonia plant air compression train, each new air chiller chilling incoming air by heat exchange with chilled water from the existing ammonia compression system;
c. a new staged water chiller that chills water for the existing ammonia plant air compression system by heat exchange with expanded high pressure ammonia from the existing ammonia compression train.
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Abstract
An ammonia plant system upgrade utilizing both a direct and indirect multistage chilling system in the ammonia plant air compression train to increase process air flow to the secondary ammonia reformer of an ammonia plant as well as upgrades to provide more pre-heating along with increased process air flow.
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Citations
8 Claims
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1. An upgrade to an existing ammonia plant utilizing a new indirect multistage chilling system in an existing ammonia plant air compression train of the existing ammonia plant to increase process air flow to an existing secondary ammonia reformer of the existing ammonia plant comprising:
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a. a new two stage suction air chiller in the existing ammonia plant air compression train that chills incoming process air by heat exchange with chilled water from an existing ammonia compression system; b. additional new two stage air chillers between each of the existing air compressors of the existing ammonia plant air compression train, each new air chiller chilling incoming air by heat exchange with chilled water from the existing ammonia compression system; c. a new staged water chiller that chills water for the existing ammonia plant air compression system by heat exchange with expanded high pressure ammonia from the existing ammonia compression train. - View Dependent Claims (2)
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3. A method for upgrading an existing ammonia plant utilizing a new indirect multistage chilling system in an existing ammonia plant air compression train to increase process air flow to an existing secondary ammonia reformer of the existing ammonia plant comprising the steps of:
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a. providing a new two stage suction air chiller in the existing ammonia plant air compression train for chilling incoming air by heat exchange with expanded high pressure ammonia from an existing ammonia compression system of the existing ammonia plant; b. providing additional new air chillers between each stage of the existing air compressors of the existing air compression train of the existing ammonia plant for chilling the compressed incoming air to each of the stages of an existing air compressor by heat exchange with expanded high pressure ammonia from the existing ammonia compression system of the existing ammonia plant; and c. providing a new staged water chiller for chilling water for the existing air compression system by heat exchange with expanded high pressure ammonia from the existing ammonia compression train. - View Dependent Claims (4)
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5. An improved ammonia plant utilizing an indirect multistage chilling system in an ammonia plant air compression train of the ammonia plant to increase process air flow to a secondary ammonia reformer of the ammonia plant comprising:
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a. a new two stage suction air chiller in the ammonia plant air compression train that chills incoming process air by heat exchange with chilled water from the ammonia compression system of the ammonia plant; b. additional two stage air chillers between each of the air compressors of the ammonia plant air compression train, each new air chiller chilling incoming air by heat exchange with chilled water from the ammonia compression system; c. a new staged water chiller that chills water for the ammonia plant air compression system by heat exchange with expanded high pressure ammonia from the ammonia compression train. - View Dependent Claims (6)
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7. An improved method for ammonia production utilizing a new indirect multistage chilling system in an ammonia plant air compression train to increase process air flow to a secondary ammonia reformer of the ammonia plant comprising the steps of:
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a. providing a new two stage suction air chiller in the ammonia plant air compression train for chilling incoming air by heat exchange with expanded high pressure ammonia from an ammonia compression system of the ammonia plant; b. providing additional new air chillers between each stage of the air compressors of the air compression train of the ammonia plant for chilling the compressed incoming air to each of the stages of an air compressor by heat exchange with expanded high pressure ammonia from the ammonia compression system of the ammonia plant; and c. providing a new staged water chiller for chilling water for the air compression system by heat exchange with expanded high pressure ammonia from the ammonia compression train. - View Dependent Claims (8)
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Specification