Cold heat recovery system and marine vessel or floating body

Patent metadata

Field	Value
Publication number	US-12535249-B2
Application number	US-202318107337-A
Country	US
Kind code	B2
Filing date	Feb 8, 2023
Priority date	Feb 9, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A cold heat recovery system includes a first cold heat recovery cycle including a first expansion turbine and configured to circulate a first heat medium, a second cold heat recovery cycle including a second expansion turbine and configured to circulate a second heat medium, a first heat exchanger provided on a downstream side of the first expansion turbine on the first cold heat recovery cycle and configured to transfer cold energy from a first fuel to the first heat medium, a second heat exchanger configured to transfer cold energy from a second fuel to the first fuel flowing on a downstream side of the first heat exchanger and reliquefy the first fuel, and a third heat exchanger provided on a downstream side of the second expansion turbine on the second cold heat recovery cycle and configured to transfer cold energy to the second heat medium from the first fuel flowing on a downstream side of the second heat exchanger.

First claim

The invention claimed is:

1 . A cold heat recovery system, comprising:
a first fuel tank configured to store first fuel in a liquid state; a second fuel tank configured to store second fuel in a liquid state having a liquefaction temperature lower than a liquefaction temperature of the first fuel; a first fuel supply line for sending the first fuel extracted from the first fuel tank; a second fuel supply line for sending the second fuel extracted from the second fuel tank; a first cold heat recovery cycle configured to circulate a first heat medium and including a first expansion turbine for expanding the first heat medium in a gas state provided on the first cold heat recovery cycle; a first heat exchanger provided on a downstream side of the first expansion turbine on the first cold heat recovery cycle and configured to transfer cold energy from the first fuel flowing through the first fuel supply line to the first heat medium; a second heat exchanger provided on a downstream side of the first heat exchanger on the first fuel supply line and configured to transfer cold energy from the second fuel flowing through the second fuel supply line to the first fuel flowing through the first fuel supply line; a second cold heat recovery cycle configured to circulate a second heat medium and including a second expansion turbine for expanding the second heat medium in a gas state provided on the second cold heat recovery cycle; a third heat exchanger provided on a downstream side of the second expansion turbine on the second cold heat recovery cycle and configured to transfer cold energy to the second heat medium from the first fuel flowing on a downstream side of the second heat exchanger on the first fuel supply line; a fourth heat exchanger provided on a downstream side of the third heat exchanger on the first fuel supply line and configured to transfer cold energy from the second fuel flowing on a downstream side of the second heat exchanger on the second fuel supply line to the first fuel flowing through the first fuel supply line; a third cold heat recovery cycle configured to circulate a third heat medium and including a third expansion turbine for expanding the third heat medium in a gas state provided on the third cold heat recovery cycle; and a fifth heat exchanger provided on a downstream side of the third expansion turbine on the third cold heat recovery cycle and configured to transfer cold energy to the third heat medium from the first fuel flowing on a downstream side of the fourth heat exchanger on the first fuel supply line; a first bypass line for bypassing the second heat exchanger and guiding the second fuel to the fourth heat exchanger from an upstream side of the second heat exchanger on the second fuel supply line; and a flow control valve provided between a connection position at an upstream end of the first bypass line on the second fuel supply line and the second heat exchanger and configured to regulate a flow rate of the second fuel passing through the flow control valve.

2 . The cold heat recovery system according to claim 1 , further comprising
a combustion device configured to combust the first fuel and the second fuel, connected to a downstream side of the third heat exchanger on the first fuel supply line, and connected to a downstream side of the second heat exchanger on the second fuel supply line.

3 . The cold heat recovery system according to claim 1 , wherein
the first cold heat recovery cycle further includes a first pump for boosting pressure of the first heat medium provided on a downstream side of the first heat exchanger on the first cold heat recovery cycle and a first evaporator for evaporating the first heat medium provided on a downstream side of the first pump on the first cold heat recovery cycle, and the second cold heat recovery cycle further includes a second pump for boosting pressure of the second heat medium provided on a downstream side of the third heat exchanger on the second cold heat recovery cycle and a second evaporator for evaporating the second heat medium provided on a downstream side of the second pump on the second cold heat recovery cycle.

4 . The cold heat recovery system according to claim 1 , wherein
the third cold heat recovery cycle includes a third pump for boosting pressure of the third heat medium provided on a downstream side of the fifth heat exchanger on the third cold heat recovery cycle and a third evaporator for evaporating the third heat medium provided on a downstream side of the third pump on the third cold heat recovery cycle.

5 . The cold heat recovery system according to claim 1 , wherein
the second fuel includes hydrogen, and the cold heat recovery system further includes a combustion device configured to combust the first fuel and the second fuel, connected to a downstream side of the third heat exchanger on the first fuel supply line, and connected to a downstream side of the second heat exchanger on the second fuel supply line, a mixing rate acquisition device configured to acquire mixing rates of the first fuel and the second fuel guided to the combustion device, and a control device configured to stop driving of either the first cold heat recovery cycle or the second cold heat recovery cycle when the mixing rate of the second fuel acquired by the mixing rate acquisition device is equal to or less than a predetermined value.

6 . The cold heat recovery system according to claim 1 , wherein
the second fuel includes hydrogen, and the cold heat recovery system further includes a combustion device configured to combust the first fuel and the second fuel, connected to a downstream side of the third heat exchanger on the first fuel supply line, and connected to a downstream side of the second heat exchanger on the second fuel supply line, a mixing rate acquisition device configured to acquire mixing rates of the first fuel and the second fuel guided to the combustion device, and a control device configured to stop driving of the third cold heat recovery cycle when the mixing rate of the second fuel acquired by the mixing rate acquisition device is equal to or less than a predetermined value.

7 . The cold heat recovery system according to claim 1 , further comprising:
a fourth cold heat recovery cycle configured to circulate a fourth heat medium and including a fourth expansion turbine for expanding the fourth heat medium in a gas state provided on the fourth cold heat recovery cycle; and a sixth heat exchanger provided on a downstream side of the fourth expansion turbine on the fourth cold heat recovery cycle and configured to transfer cold energy to the fourth heat medium from the second fuel flowing on an upstream side of the second heat exchanger on the second fuel supply line.

8 . The cold heat recovery system according to claim 7 , further comprising:
a fifth cold heat recovery cycle configured to circulate a fifth heat medium having a higher freezing point than a freezing point of the fourth heat medium and including a fifth expansion turbine for expanding the fifth heat medium in a gas state provided on the fifth cold heat recovery cycle; and a fourth evaporator provided on an upstream side of the fourth expansion turbine on the fourth cold heat recovery cycle, and configured to transfer thermal energy to the fourth heat medium from the fifth heat medium flowing on a downstream side of the fifth expansion turbine on the fifth cold heat recovery cycle.

9 . The cold heat recovery system according to claim 8 , wherein
the fourth cold heat recovery cycle further includes a fourth pump for boosting pressure of the fourth heat medium provided on a downstream side of the sixth heat exchanger

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Tanaka Toshimitsu
• TAKATA Ryo

Classifications

• F17C2270/0102

  on or in the water · CPC title

• F17C2265/066

  for feeding engines for propulsion · CPC title

• F17C2227/0355

  in a closed loop · CPC title

• F17C2227/0323

  in a closed loop · CPC title

• F17C2227/0135

  Pumps · CPC title