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WO2019177464A1 - A system for recovery of waste heat from an industrial plant - Google Patents

A system for recovery of waste heat from an industrial plant Download PDF

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Publication number
WO2019177464A1
WO2019177464A1 PCT/NO2019/000008 NO2019000008W WO2019177464A1 WO 2019177464 A1 WO2019177464 A1 WO 2019177464A1 NO 2019000008 W NO2019000008 W NO 2019000008W WO 2019177464 A1 WO2019177464 A1 WO 2019177464A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
heat
flu
cooling
hot surface
Prior art date
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Ceased
Application number
PCT/NO2019/000008
Other languages
French (fr)
Inventor
Veroslav Sedlak
Didier OSTORERO
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Cronus Technology As
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Cronus Technology As
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Filing date
Publication date
Application filed by Cronus Technology As filed Critical Cronus Technology As
Publication of WO2019177464A1 publication Critical patent/WO2019177464A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/26—Treatment of water, waste water, or sewage by extraction
    • C02F1/265—Desalination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/003—Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Definitions

  • the invention relates to heat recovery and utilization in general and more specifically a system for converting recovered thermal energy from an industrial plant to cooling of a cooling medium in a cooling infrastructure.
  • waste heat in an industrial plant in flue gas and/or from hot surface area is used to generate cooling, generate power, produce desalinated water and other similar purposes.
  • waste heat in industrial processes such as aluminum electrolysis is recovered by heat exchangers and used for cooling generation, power generation, desalination and similar purposes.
  • a MHD device can be a MHD generator mounted on a heat pipe.
  • the heat pipe have a heat absorbing end for absorbing heat from a heat source. A part of the heat can be transformed to kinetic energy in a conducting working fluid because of phase change in the fluid when heatin.
  • the heat pipe also have a heat extracting end for extracting electric energy, wherein at least one MHD generator is mounted onto the heat extracting end transforming a part of the kinetic energy in the working fluid into electric energy.
  • the organic Rankine cycle uses an organic fluid such as n-pentane or toluene in place of water and steam. This allows use of lower-temperature heat sources, such as solar ponds, which typically operate at around 70-90 °C. The efficiency of the cycle is lower compared to an ordinary Rankine cycle as a result of the lower temperature range, but this can be worthwhile because of the lower cost involved in gathering heat at this lower temperature.
  • WO2012039624 and WO2013105867 both by another applicant, relate both to systems and methods for control of side layer formation in an aluminum electrolysis cell.
  • One object of the invention is an apparatus for converting thermal energy in an industrial plant from high temperature surface area.
  • Another object of the invention is an apparatus for converting thermal energy in an industrial plant from flue gas.
  • a further object of the invention is an apparatus transferring the extracted thermal energy to a thermal energy utilization unit, more specifically to cooling of a cooling medium in a cooling infrastructure.
  • An example of application is taking the waste heat of an aluminum plant and use it for cooling of a cooling medium transported in a system of isolated pipes in a geographical area
  • the invention describes a system for recovery of waste heat from an industrial plant (100) comprising a heat source assembly.
  • the heat source assembly comprises a flu-gas extraction unit concentrating flu-gas from the heat source, a flu-gas heat exchanger, a hot surface area exposing waste heat to its surroundings, a hot surface heat exchanger, a heat source circulating pump and a heating medium for transferring heat from the heat source,
  • the system comprises a thermal energy conversion unit which in turn comprises a cooling medium heat exchanger, a heating medium heat exchanger, a thermal energy convertor which comprises one or more of the following convertor units: MHD device, steam/ORC device, absorption chiller and desalination device, and a converted energy distributor.
  • the system furthermore comprises a cooling system comprising a pumping device and a cooling medium for transferring waste heat from the conversion unit.
  • the heating and cooling medium is water and the energy convertor comprises one or more convertor units coupled in serial and in one of the following two orders: 1. MHD device, steam/ORC device, absorption chiller and desalination device and 2. MHD device, absorption chiller, ORC device and desalination device
  • Fig. 1 shows an embodiment with utilization of waste heat recovery in an industrial plant in a thermal energy conversion unit.
  • Fig. 2 shows an optimal order of convertor devices.
  • a system for recovering waste heat from an industrial plant 100 is provided and depicted in figure 1.
  • the system comprises a heat source assembly 110, a thermal energy conversion unit 120 and a cooling unit 130.
  • the heat source assembly 110 comprises a flu-gas extraction unit 111 with a flu gas heat exchanger 114 extracting heat from the flu-gas extraction unit 111.
  • the heat source assembly 110 further comprises a hot surface area 112 with a hot surface heat exchanger 113 extracting heat from the hot surface area 112.
  • the heat source assembly 110 also comprises a heat source circulating pump 115 that pumps a heat transport medium.
  • the heat source assembly is attached to an industrial an oven, a furnace or an aluminum electrolysis cell.
  • the mentioned heat transport medium will hereinafter be called the heating medium because it supplies heat from the heat source assembly 110 to the conversion unit 120 by means of a heating circuit.
  • a medium that cools the conversion unit 120 is called the cooling medium and transports heat from the conversion unit 120 to the cooling unit 130 by means of a cooling circuit and thus cools the conversion unit 120.
  • the thermal energy conversion unit 120 comprises a cooling medium heat exchanger 121, a heating medium heat exchanger 122, a thermal energy convertor 123 and a converted heat distributor 124.
  • the heating medium heat exchanger 122 receives the thermal energy from the heat source assembly 110, and the cooling medium heat exchanger 121 transfer thermal waste heat generated by the thermal energy convertor 123 to the cooling unit 130.
  • a converted energy distributor 124 is attached in connection with the thermal energy conversion unit 120 . This cold for example be a network of pipes for heating or cooling, electric cables.
  • the thermal energy convertor 123 can comprise different convertor devices.
  • a convertor device can be an electrical power generator such as a MHD device or an ORC device, a cooling generator such as an absorption chiller, a desalination device or other technology with similar functionality. The four mentioned units are explained in‘Related Prior Art’.
  • the cooling unit 130 comprises a cooling medium circulation pump 131 and a cooling tower.
  • the cooling tower 132 may be substituted by other types of cooling equipment.
  • the flu-gas heat exchanger 114 and the hot surface heat exchanger 113 are connected in parallel.
  • the circulating medium is further transported through the heating medium circuit to the thermal energy conversion unit 120.
  • the cooling medium and the heating medium is water. This has the advantage of low costs and high degree of safety.
  • the hot surface heat exchanger 113 could also use a heat pipe in the case where the convertor device 123 is a MHD device.
  • the flu-gas extraction unit 111 unit and the hot surface area 112 further comprises a heat collection manifold wherein the flu-gas extraction unit 111 and the hot surface area 112 are connected in serial to the heat collection manifold further connected to the energy conversion unit 120.
  • the flu-gas extraction 111 unit and the hot surface area 112 further comprising a heat collection manifold wherein the flu-gas extraction and the hot surface area are connected in parallel to the heat collection manifold further connected to the energy conversion unit 120.
  • an array of energy conversion units (120) are cooled by one individual cooling system (130) or by an array of multiple cooling systems connected for example in a main ring arrangement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Processing Of Solid Wastes (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

A system for converting thermal energy from an industrial process into other form of usable energy. The present invention attains the above-described objective by a plurality of heat exchangers extracting heat from flu-gas and/or hot surfaces from an industrial plant and/or process, transferring the extracted heat to thermal energy conversion unit where the energy is converted to other usable energy form.

Description

Title: A system for recovery of waste heat from an industrial plant
Field of the invention
The invention relates to heat recovery and utilization in general and more specifically a system for converting recovered thermal energy from an industrial plant to cooling of a cooling medium in a cooling infrastructure.
Related prior art
From prior art one should refer to general waste recovery technology wherein waste heat in an industrial plant in flue gas and/or from hot surface area is used to generate cooling, generate power, produce desalinated water and other similar purposes.
From prior art one should also refer to general waste recovery technology wherein waste heat in industrial processes such as aluminum electrolysis is recovered by heat exchangers and used for cooling generation, power generation, desalination and similar purposes.
At the same time such industrial processes, particularly electrochemical processes require large amounts of power and even with prior art the recovered power is low, complexities are high, and temperature of the recovery system is low and thus overall efficiency is low. This also brings in associated problems such as pollution.
Relevant technologies are MHD devices. ORC devices, absorption chillers and desalination devices. A MHD device can be a MHD generator mounted on a heat pipe. The heat pipe have a heat absorbing end for absorbing heat from a heat source. A part of the heat can be transformed to kinetic energy in a conducting working fluid because of phase change in the fluid when heatin. The heat pipe also have a heat extracting end for extracting electric energy, wherein at least one MHD generator is mounted onto the heat extracting end transforming a part of the kinetic energy in the working fluid into electric energy.
The organic Rankine cycle (ORC) uses an organic fluid such as n-pentane or toluene in place of water and steam. This allows use of lower-temperature heat sources, such as solar ponds, which typically operate at around 70-90 °C. The efficiency of the cycle is lower compared to an ordinary Rankine cycle as a result of the lower temperature range, but this can be worthwhile because of the lower cost involved in gathering heat at this lower temperature.
The traditional process used in desalination is vacuum distillation - essentially boiling it to leave impurities behind. In desalination, atmospheric pressure is reduced, thus lowering the required temperature needed. Liquids boil when the vapor pressure equals the ambient pressure and vapor pressure increases with temperature.
Effectively, liquids boil at a lower temperature, when the ambient atmospheric
pressure is less than usual atmospheric pressure. Thus, because of the reduced
pressure, low-temperature "waste" heat from electrical power generation or industrial processes can be employed.
In absorption chillers heat from a waste -heat source drives the process. The high affinity of the refrigerant for the absorbent (usually lithium bromide or ammonia) causes the refrigerant to boil at a lower temperature and pressure than it normally would and transfers heat from one place to another.
WO2012039624 and WO2013105867, both by another applicant, relate both to systems and methods for control of side layer formation in an aluminum electrolysis cell.
Objects of the invention
One object of the invention is an apparatus for converting thermal energy in an industrial plant from high temperature surface area.
Another object of the invention is an apparatus for converting thermal energy in an industrial plant from flue gas.
A number of non-exhaustive embodiments, variants or alternatives of the
invention are defined by the dependent claims.
A further object of the invention is an apparatus transferring the extracted thermal energy to a thermal energy utilization unit, more specifically to cooling of a cooling medium in a cooling infrastructure. An example of application is taking the waste heat of an aluminum plant and use it for cooling of a cooling medium transported in a system of isolated pipes in a geographical area
Summary of the invention The invention describes a system for recovery of waste heat from an industrial plant (100) comprising a heat source assembly. The heat source assembly comprises a flu-gas extraction unit concentrating flu-gas from the heat source, a flu-gas heat exchanger, a hot surface area exposing waste heat to its surroundings, a hot surface heat exchanger, a heat source circulating pump and a heating medium for transferring heat from the heat source,
Furter the system comprises a thermal energy conversion unit which in turn comprises a cooling medium heat exchanger, a heating medium heat exchanger, a thermal energy convertor which comprises one or more of the following convertor units: MHD device, steam/ORC device, absorption chiller and desalination device, and a converted energy distributor. The system furthermore comprises a cooling system comprising a pumping device and a cooling medium for transferring waste heat from the conversion unit.
Furthermore the heating and cooling medium is water and the energy convertor comprises one or more convertor units coupled in serial and in one of the following two orders: 1. MHD device, steam/ORC device, absorption chiller and desalination device and 2. MHD device, absorption chiller, ORC device and desalination device
Brief description of drawings
The above and further features of the invention are set forth with particularity in the appended claims and together with advantages thereof will become clearer from consideration of the following detailed description of an [exemplary] embodiment of the invention given with reference to the accompanying drawings.
The invention will be further described below in connection with exemplary embodiments which are schematically shown in the drawings, wherein:
Fig. 1 shows an embodiment with utilization of waste heat recovery in an industrial plant in a thermal energy conversion unit.
Fig. 2 shows an optimal order of convertor devices.
Detailed description
A system for recovering waste heat from an industrial plant 100 is provided and depicted in figure 1. The system comprises a heat source assembly 110, a thermal energy conversion unit 120 and a cooling unit 130. The heat source assembly 110 comprises a flu-gas extraction unit 111 with a flu gas heat exchanger 114 extracting heat from the flu-gas extraction unit 111. The heat source assembly 110 further comprises a hot surface area 112 with a hot surface heat exchanger 113 extracting heat from the hot surface area 112. The heat source assembly 110 also comprises a heat source circulating pump 115 that pumps a heat transport medium. Typically the heat source assembly is attached to an industrial an oven, a furnace or an aluminum electrolysis cell.
The mentioned heat transport medium will hereinafter be called the heating medium because it supplies heat from the heat source assembly 110 to the conversion unit 120 by means of a heating circuit. A medium that cools the conversion unit 120 is called the cooling medium and transports heat from the conversion unit 120 to the cooling unit 130 by means of a cooling circuit and thus cools the conversion unit 120.
The thermal energy conversion unit 120 comprises a cooling medium heat exchanger 121, a heating medium heat exchanger 122, a thermal energy convertor 123 and a converted heat distributor 124. The heating medium heat exchanger 122 receives the thermal energy from the heat source assembly 110, and the cooling medium heat exchanger 121 transfer thermal waste heat generated by the thermal energy convertor 123 to the cooling unit 130. In connection with the thermal energy conversion unit 120 a converted energy distributor 124 is attached. This cold for example be a network of pipes for heating or cooling, electric cables.
The thermal energy convertor 123 can comprise different convertor devices. A convertor device can be an electrical power generator such as a MHD device or an ORC device, a cooling generator such as an absorption chiller, a desalination device or other technology with similar functionality. The four mentioned units are explained in‘Related Prior Art’.
The cooling unit 130 comprises a cooling medium circulation pump 131 and a cooling tower. The cooling tower 132 may be substituted by other types of cooling equipment.
However the different convertor devices are working optimally in different temperature ranges: MHD device: 200 - 1000 C, steam/ORC device: 70-300 C, Absorption chiller: 100 - 200 and Desalination device: 50-100 C. It should be noted that we are now assuming that cooling is a desired effect near the plant. The devices should be ordered in serial such that each device is operating optimally. Not surprisingly the temperature ranges are overlapping, but from this list of temperature ranges we can deduce two possible optimal sequences of convertor devices: 1. MHD device, steam/ORC device, absorption chiller and finally desalination device and 2. MHD device, absorption chiller, ORC device and desalination device. With these two sequences of convertor devices more energy is converted than is possible by any one convertor device however optimized.
In one embodiment also the flu-gas heat exchanger 114 and the hot surface heat exchanger 113 are connected in parallel. The circulating medium is further transported through the heating medium circuit to the thermal energy conversion unit 120.
In one embodiment the cooling medium and the heating medium is water. This has the advantage of low costs and high degree of safety. The hot surface heat exchanger 113 could also use a heat pipe in the case where the convertor device 123 is a MHD device.
In a further embodiment the flu-gas extraction unit 111 unit and the hot surface area 112 further comprises a heat collection manifold wherein the flu-gas extraction unit 111 and the hot surface area 112 are connected in serial to the heat collection manifold further connected to the energy conversion unit 120.
In a further embodiment the flu-gas extraction 111 unit and the hot surface area 112 further comprising a heat collection manifold wherein the flu-gas extraction and the hot surface area are connected in parallel to the heat collection manifold further connected to the energy conversion unit 120.
In a further embodiment an array of energy conversion units (120) are cooled by one individual cooling system (130) or by an array of multiple cooling systems connected for example in a main ring arrangement.
Inventory
Figure imgf000008_0001

Claims

1. A system for recovery of waste heat from an industrial plant (100) comprising a heat source assembly (110) comprising: a flu-gas extraction unit (111) concentrating flu-gas from the heat source, a flu-gas heat exchanger (114),
a hot surface area (112) exposing waste heat to its surroundings a hot surface heat exchanger (113), and
a heat source circulating pump (115) and a heating medium for transferring heat from the heat source, a thermal energy conversion unit (120),
comprising: a cooling medium heat exchanger (121),
a heating medium heat exchanger (122),
a thermal energy convertor (123) comprising one or more of the following convertor units: MHD device, steam/ORC device, absorption chiller and desalination device, and
a converted energy distributor (124), a cooling system (130) comprising a pumping device and a cooling medium for transferring waste heat from the conversion unit (120), characterized in that the heating and cooling medium is water and that the energy convertor comprises one or more convertor units coupled in serial and in one of the following two orders: 1. MHD device, steam/ORC device, absorption chiller and desalination device and 2. MHD device, absorption chiller, ORC device and desalination device
2. The system according to claim 1, wherein the cooling system (130) comprising cooling medium circulating pump (131) extracting the cooling medium from natural sources.
3. The system according to claim 1, wherein the flu-gas heat exchanger (114) and the hot surface heat exchanger (113) are connected in parallel.
4. The system according to claim 1, wherein the flu-gas heat exchanger (114) and the hot surface heat exchanger (113) are connected in serial configuration.
5. The system according to claim 1, wherein only the flu-gas heat exchanger (114) or only the hot surface heat exchanger (113) are connected to thermal energy conversion unit (120).
6. The system according to claim 1, wherein only part of the flu-gas heat exchanger heating medium flow (114) are mixed with hot surface heat exchanger (113) heating medium flow and is connected to thermal energy conversion unit (120).
7. The system according to claim 1, wherein the heating medium is air, water, thermal oil, molten metals, or molten salts.
8. The system according to claim 1, wherein the cooling medium is water, thermal oil, or other fluids.
9. The system according to claim 1, wherein the flu-gas or/and hot surface heat exchangers from several individual heat source assemblies (110) can be fed into one or several energy conversion units (120).
10. The system according to claim 1, wherein array of energy conversion units (120) are cooled by one individual cooling system (130) or by array of multiple cooling systems connected for example in ring main arrangement.
11. The system according to claim 1, wherein individual energy conversion unit (120) or array of several energy conversion unit feed the one or several converted energy distributors (124).
12 The system according to claim 1, wherein the converted energy distributor (124) is pipes, electrical cables depending on kind of converted energy.
13. The system according to claim 1 wherein the heat source assembly (110) is an aluminum electrolysis cell.
14. The system according to claim 1 wherein the flu-gas heat exchanger (114) is using heat pipe.
15. The system according to claim 1 wherein the hot surface heat exchanger (113) is using heat pipe.
PCT/NO2019/000008 2018-03-16 2019-03-13 A system for recovery of waste heat from an industrial plant Ceased WO2019177464A1 (en)

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