Water gas shift unit steam superheater
AssigneeAir Products and Chemicals, Inc.
InventorYANLAI ZHANG
Life of this patent
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Abstract
A method and system for converting a syngas stream to a shifted syngas stream in a shift reactor comprising a first mode of operation and a second mode of operation. The first mode of operation uses heat from the shifted syngas stream to superheat steam in a heat exchanger. The second mode of operation uses the same heat exchanger to heat a partially shifted syngas stream while the shift reactor is heating up to a normal operating temperature.
Claims16
A method for converting a syngas stream to a shifted syngas stream comprising a first mode of operation and a second mode of operation,
- wherein the first mode of operation comprises:
- transferring heat from a warm shifted syngas stream to the syngas stream in a first heat exchanger to produce the shifted syngas stream and a heated syngas stream;
- reacting the heated syngas stream in the presence of a shift catalyst to produce a hot shifted syngas stream;
- and
- transferring heat from the hot shifted syngas stream to a steam stream in a second heat exchanger to produce the warm shifted syngas stream and a superheated steam stream;
- and wherein the second mode of operation comprises:
- transferring heat from a hot partially shifted syngas stream to the syngas stream in the first heat exchanger to produce a warm partially shifted syngas stream and the heated syngas stream;
- reacting the heated syngas stream in the presence of a shift catalyst to produce a partially shifted syngas stream;
- and
- transferring heat from a preheating fluid to the partially shifted syngas stream in the second heat exchanger to produce a cooled preheating fluid and the hot partially shifted syngas stream.
A system for converting a syngas stream to a shifted syngas stream comprising:
- a first heat exchanger comprising a hot side inlet, a hot side outlet, a cold side inlet, and a cold side outlet;
- a second heat exchanger comprising a hot side inlet, a hot side outlet, a cold side inlet, and a cold side outlet;
- a reactor comprising a shift catalyst, an inlet, and an outlet;
- wherein the system comprises a first mode of operation and a second mode of operation,
- wherein during the first mode of operation:
- the cold side inlet of the first heat exchanger is in fluid flow communication with the syngas stream;
- the cold side outlet of the first heat exchanger is in fluid flow communication with the inlet of the reactor;
- the outlet of the reactor is in fluid flow communication with the hot side inlet of the second heat exchanger;
- the hot side outlet of the second heat exchanger is in fluid flow communication with the hot side inlet of the first heat exchanger;
- and
- the cold side inlet of the second heat exchanger is in fluid flow communication with a steam stream;
- and wherein during the second mode of operation:
- the cold side inlet of the first heat exchanger is in fluid flow communication with the syngas stream;
- the cold side outlet of the first heat exchanger is in fluid flow communication with the inlet of the reactor;
- the outlet of the reactor is in fluid flow communication with the cold side inlet of the second heat exchanger;
- the cold side outlet of the second heat exchanger is in fluid flow communication with the hot side inlet of the first heat exchanger;
- and
- the hot side inlet of the second heat exchanger is in fluid flow communication with a preheating fluid.
Dependencies are inferred from the claim text.