Heat-transfer-liquid-operated turbine and compressor

Patent metadata

Field	Value
Publication number	US-12494697-B2
Application number	US-202218289474-A
Country	US
Kind code	B2
Filing date	Mar 9, 2022
Priority date	May 6, 2021
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

An energy storage and retrieval system including an air chamber, a first air compressor operating with Heat Transfer Liquid (HTL-compressor) connected to the air chamber, a second turbine, operating with Heat Transfer Liquid (HTL-turbine) connected to the air chamber, accepting compressed air from the air chamber and producing work. Related apparatus and methods are also described.

First claim

What is claimed is:

1 . A method for converting waste heat of exhaust gas to work
while reducing CO 2 emission in the waste heat, comprising: feeding into a direct contact heat exchanger an exhaust gas that comprises CO 2 and a heat transfer liquid (HTL) that comprises molten salt, thereby resulting in mixing the HTL with the exhaust gas and heating of the HTL to obtain heated HTL; wherein the HTL comprises a CO 2 -capturing material to absorb the CO 2 from the exhaust gas, and said mixing resulting in the CO 2 -capturing material capturing the CO 2 from the exhaust gas, thereby reducing an amount of CO 2 in the exhaust gas; operating an HTL-turbine for performing an isothermal or quasi-isothermal expansion with the heated HTL following said mixing; and producing work using the HTL-turbine.

2 . The method of claim 1 ,
wherein the HTL exits the heat exchanger at a temperature of about the entrance temperature of the exhaust gas, while the exhaust gas exits the heat exchanger at a temperature about the entering temperature of the HTL.

3 . The method of claim 1 ,
wherein said CO 2 capturing material solidifies upon absorbing CO 2 , and the method further comprising removing the CO 2 capturing material which has absorbed CO 2 from the exhaust gas before reaching the HTL-turbine.

4 . The method according to claim 1 wherein the CO 2 -capturing material comprises a material selected from a group consisting of:
CaO;
MgO;
NaCO 3 (+H 2 O);
NaCO 3 ;
KCO 3 (+H 2 O);
KCO 3 ; and
Na 2 O.

5 . The method according to claim 1 , wherein producing work comprises producing electricity.

6 . The method according to claim 1 , wherein CO 2 capturing material which has absorbed CO 2 from the exhaust gas is removed before reaching the HTL-turbine.

7 . The method according to claim 1 , wherein the molten salt is in a molten state in a temperature range of between 140° C.-530° C.

8 . The method according to claim 1 , wherein said heating comprises heating the HTL that comprises molten salt to a temperature above 670K, using a direct heat exchanger and waste heat of exhaust gas.

9 . The method according to claim 1 , wherein interaction of the CO 2 capturing material with the CO 2 produces a new material which is removable from the HTL;
wherein the method further comprising removing the new material from the HTL.

10 . A method for converting waste heat of exhaust gas to work while
reducing CO 2 emission in the waste heat, comprising: feeding into a direct contact heat exchanger an exhaust gas that comprises CO 2 and a heat transfer liquid (HTL) that comprises molten salt thereby resulting in mixing the HTL with the exhaust gas and heating of the HTL to obtain heated HTL; wherein the HTL comprises a CO 2 capturing material, to absorb CO 2 from the exhaust gas, and said mixing resulting in the CO 2 -capturing material capturing the CO 2 from the exhaust gas, thereby reducing an amount of CO 2 in the exhaust gas; operating an HTL-turbine for performing an isothermal or quasi-isothermal expansion with the heated HTL following said mixing; and producing work using the HTL-turbine; wherein interaction of the CO 2 capturing material with the CO 2 produces a new material which is removable from the HTL; wherein the method further comprises removing the new material from the HTL.

11 . A method for converting waste heat of exhaust gas to work while reducing CO 2 emission in the waste heat, comprising: feeding into a direct contact heat exchanger an exhaust gas that comprises CO 2 and a heat transfer liquid (HTL) that comprises molten salt, thereby resulting in mixing the HTL with the exhaust gas and heating of the HTL to obtain heated HTL; wherein the HTL comprises a CO 2 capturing material to absorb CO 2 from the exhaust gas, and said mixing resulting in the CO 2 -capturing material capturing the CO 2 from the exhaust gas, thereby reducing an amount of CO 2 in the exhaust gas; operating an HTL-turbine for performing an isothermal or quasi-isothermal expansion with the heated HTL following said mixing; and producing work using the HTL-turbine;
wherein said CO 2 capturing material solidifies upon absorbing CO 2 , and the method further comprising removing the CO 2 capturing material which has absorbed CO 2 from the exhaust gas before reaching the HTL-turbine.

Assignees

• Technion Res & Dev Foundation

Inventors

• Rotschild Carmel
• Cassell Joseph

Classifications

• F02C6/18

  using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants (using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10) · CPC title

• B01D2258/01

  Engine exhaust gases · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2251/606

  Carbonates · CPC title

• B01D2251/602

  Oxides · CPC title