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US 2026/0275535 A1Published application
Hydrogen production system and method for operating hydrogen production system
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsYasushi Iwai, Norihisa Matake, Masayuki Kato, Hiroki Irie
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Abstract
This hydrogen production system comprises: a solid oxide electrolysis cell (SOEC) that electrolyzes water vapor; a water vapor generation device that heats supply water to generate water vapor; and a combustor that partially burns hydrogen included in water vapor discharged from a hydrogen electrode of the SOEC. The water vapor generation device is configured such that the supply water is at least partially heated through heat exchange between at least part of the supply water and gas including combustion gas generated in the combustor so as to produce at least part of the water vapor.
Claims19
A hydrogen production system comprising;
- a solid oxide electrolysis cell (SOEC) that electrolyzes steam;
- a steam generator that generates the steam by heating supply water;
- a combustor that combusts a part of hydrogen contained in steam discharged from a hydrogen electrode of the SOEC;
- a steam discharge line through which the steam discharged from the hydrogen electrode passes:
- a gas discharge line through which an exhaust gas discharged from an oxygen electrode of the SOEC passes:
- an oxygen-containing gas supply line that allows the gas discharge line and the combustor to communicate with each other:
- a gas supply line that supplies an oxygen-containing gas to the oxygen electrode:
- an exhaust gas recirculation line that allows the gas supply line and the gas discharge line to communicate with each other;
- and
- a booster that boosts the exhaust gas passing through the exhaust gas recirculation line,
- wherein the steam generator is configured such that at least a part of the supply water is heated to generate at least a part of the steam by exchanging heat between at least the part of the supply water and a gas containing a combustion gas generated in the combustor,
- the steam generator includes a main heat exchanger that exchanges heat between the steam passing through the steam discharge line and the supply water,
- the combustor is provided on an upstream side of the main heat exchanger in the steam discharge line, and
- the oxygen-containing gas supply line branches from the gas discharge line on a downstream side of a position at which the exhaust gas recirculation line branches from the gas discharge line.
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A hydrogen production system comprising:
- a solid oxide electrolysis cell (SOEC) that electrolyzes steam;
- a steam generator that generates the steam by heating supply water;
- a combustor that combusts a part of hydrogen contained in steam discharged from a hydrogen electrode of the SOEC:
- a steam discharge line through which the steam discharged from the hydrogen electrode passes:
- a gas discharge line through which an exhaust gas discharged from an oxygen electrode of the SOEC passes:
- a gas supply line that supplies an oxygen-containing gas to the oxygen electrode;
- an exhaust gas recirculation line that allows the gas supply line and the gas discharge line to communicate with each other;
- a booster that boosts the exhaust gas passing through the exhaust gas recirculation line;
- and
- an oxygen-containing gas supply line that allows the exhaust gas recirculation line and the combustor to communicate with each other,
- wherein the steam generator is configured such that at least a part of the supply water is heated to generate at least a part of the steam by exchanging heat between at least the part of the supply water and a gas containing a combustion gas generated in the combustor,
- the steam generator includes a main heat exchanger that exchanges heat between the steam passing through the steam discharge line and the supply water,
- the combustor is provided on an upstream side of the main heat exchanger in the steam discharge line, and
- the oxygen-containing gas supply line branches from the exhaust gas recirculation line on a downstream side of the booster.
11 more elements
A hydrogen production system comprising;
- a solid oxide electrolysis cell (SOEC) that electrolyzes steam;
- a steam generator that generates the steam by heating supply water:
- a combustor that combusts a part of hydrogen contained in steam discharged from a hydrogen electrode of the SOEC:
- a steam discharge line through which the steam discharged from the hydrogen electrode passes;
- and
- a gas discharge line through which an exhaust gas discharged from an oxygen electrode of the SOEC passes,
- wherein the steam generator includes a first heat exchanger that is configured such that at least a part of the supply water is heated to generate at least a part of the steam by exchanging heat between at least the part of the supply water and a gas containing a combustion gas generated in the combustor,
- the combustor is provided in the gas discharge line,
- the combustor communicates with the steam discharge line via a hydrogen-containing gas supply line,
- the steam generator further includes a second heat exchanger provided on an upstream side of the combustor in the gas discharge line, and
- each of the first heat exchanger and the second heat exchanger is configured to exchange heat between at least the part of the supply water and the exhaust gas passing through the gas discharge line.
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A hydrogen production system comprising:
- a solid oxide electrolysis cell (SOEC) that electrolyzes steam;
- a steam generator that generates the steam by heating supply water;
- a combustor that combusts a part of hydrogen contained in steam discharged from a hydrogen electrode of the SOEC:
- a steam discharge line through which the steam discharged from the hydrogen electrode passes;
- and
- a gas discharge line through which an exhaust gas discharged from an oxygen electrode of the SOEC passes,
- wherein the steam generator includes;
- a main heat exchanger that exchanges heat between at least the part of the supply water and the steam passing through the steam discharge line;
- a first heat exchanger that is configured such that at least a part of the supply water is heated to generate at least a part of the steam by exchanging heat between at least the part of the supply water and a gas containing a combustion gas generated in the combustor, and
- the combustor is provided in the gas discharge line,
- the combustor communicates with the steam discharge line via a hydrogen-containing gas supply line,
- the hydrogen production system further comprises:
- a supply water line that supplies the supply water to the main heat exchanger;
- a supply water branch line that allows the supply water line and the first heat exchanger to communicate with each other;
- a steam supply line that allows the main heat exchanger and the hydrogen electrode to communicate with each other;
- a steam line that allows the first heat exchanger and the steam supply line to communicate with each other;
- and
- a first flow rate regulation device that regulates a flow rate of the supply water supplied to the main heat exchanger and a flow rate of the supply water passing through the supply water branch line.
15 more elements
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A hydrogen production system comprising;
- a solid oxide electrolysis cell (SOEC) that electrolyzes steam;
- a steam discharge line through which the steam discharged from a hydrogen electrode of the SOEC passes;
- a main heat exchanger that generates the steam by heating supply water through heat exchange between the supply water and the steam passing through the steam discharge line;
- a combustor that combusts a part of hydrogen contained in the steam discharged from the hydrogen electrode;
- a superheater that exchanges heat between the steam generated in the main heat exchanger and the combustion gas generated in the combustor;
- a gas discharge line through which an exhaust gas discharged from an oxygen electrode of the SOEC passes;
- a steam bleeding line that allows the steam discharge line and the combustor to communicate with each other;
- and
- an exhaust gas bleeding line that allows the gas discharge line and the combustor to communicate with each other.
6 more elements
Dependencies are inferred from the claim text.