WO2016186512A1 - Système et procédé pour récupérer de la chaleur perdue à partir d'une centrale électrique thermique et industrielle combinée - Google Patents

Système et procédé pour récupérer de la chaleur perdue à partir d'une centrale électrique thermique et industrielle combinée Download PDF

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Publication number
WO2016186512A1
WO2016186512A1 PCT/NO2016/050090 NO2016050090W WO2016186512A1 WO 2016186512 A1 WO2016186512 A1 WO 2016186512A1 NO 2016050090 W NO2016050090 W NO 2016050090W WO 2016186512 A1 WO2016186512 A1 WO 2016186512A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
circuit
heat exchanger
fuel
industrial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NO2016/050090
Other languages
English (en)
Inventor
Veroslav Sedlak
Didier OSTORERO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GOODTECH RECOVERY TECHNOLOGY AS
Original Assignee
GOODTECH RECOVERY TECHNOLOGY AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GOODTECH RECOVERY TECHNOLOGY AS filed Critical GOODTECH RECOVERY TECHNOLOGY AS
Publication of WO2016186512A1 publication Critical patent/WO2016186512A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F01K5/00—Plants characterised by use of means for storing steam in an alkali to increase steam pressure, e.g. of Honigmann or Koenemann type
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/20—Automatic control or regulation of cells
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/22—Collecting emitted gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/04—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/60—Application making use of surplus or waste energy
    • F05D2220/62—Application making use of surplus or waste energy with energy recovery turbines

Definitions

  • the invention relates to heat recovery in general and more specifically a system and a method for recovering waste heat from an industrial process in pre heating combustion air and fuel.
  • waste heat in a thermal power station in the flue is used to preheat air and/or fuel entering the thermal power station burner.
  • WO2012039624 and WO2013105867 both by the present applicant, relate both to systems and methods for control of side layer formation in an aluminium electrolysis cell. Disclosure of the Invention
  • a main objective of the present invention is to provide a system and a method that overcomes the problems described above.
  • the objective is achieved according to the invention by an apparatus for recovering waste heat as defined in the preamble of claim 1 , having the features of the characterising portion of claim 1 and a method for recovering waste heat as defined in the preamble of claim 13, having the features of the characterising portion of claim 13.
  • the present invention attains the above-described objective by a plurality of heat exchangers extracting heat from flue gas from a power plant and waste heat from an industrial process and transferring the extracted heat to air and optionally fuel entering said power plant.
  • a system for recovering waste heat from a combined plant comprising a thermal power plant and an industrial plant, wherein the thermal power plant is distinct from the industrial plant, the system comprising a heat exchanger circuit having a working fluid, further comprising a heat extraction circuit comprising an industrial gas circuit comprising at least one heat exchanger for extracting waste heat from the industrial plant, and a burner circuit comprising at least one heat exchanger for heating at least one from a group comprising air in an air pre-heater heating air from an air inlet and fuel in a fuel pre-heater heating fuel from a fuel inlet of the thermal power plant, wherein the burner circuit uses heat extracted from the heat extraction circuit.
  • the heat extraction circuit further comprises a flue gas circuit comprising a flue gas heat exchanger for extracting waste heat from a flue gas in a flue of the thermal power plant.
  • the heat extraction circuit further comprising a heat collection manifold wherein the flue gas circuit and the industrial gas circuit are connected in parallel to the heat collection manifold.
  • the flue gas circuit and the industrial gas circuit are connected in series.
  • the heat extraction circuit further comprises a heat distribution manifold wherein the burner air inlet heat exchanger and burner fuel inlet heat exchanger are connected in parallel to the heat distribution manifold. In one embodiment the burner air inlet heat exchanger and burner fuel inlet heat exchanger are connected in series.
  • At least part of the exhaust gas in the exhaust conduit is fed into the air inlet of the thermal power plant.
  • the working fluid is air.
  • At least part of the working fluid is fed into the air inlet.
  • the working fluid is fuel
  • At least part of the working fluid is fed into the fuel inlet.
  • the industrial plant comprises an aluminium electrolysis cell and wherein the industrial plant circuit comprises an exhaust heat exchanger and a sidelining heat exchanger.
  • a method for recovering waste heat from a combined plant wherein the flue gas circuit and the industrial gas circuit are connected in parallel to the heat collection manifold when temperature of the flue gas in the flue is above a threshold T s , and wherein the flue gas circuit and the industrial gas circuit are connected in series when temperature of the flue gas in the flue is below a threshold T p .
  • T s is more than 150°C and T p is less than 100°C.
  • feed in the form of air and/or fuel to the burner in a thermal power plant is pre heated in a sequence that provides optimum use of waste heat and delivering maximum pre heating to the burner.
  • Fig. 1 shows an embodiment with a parallel heating of air and fuel using heat in a flue and in an industrial process
  • Fig. 2 shows an embodiment with a series heating of air and fuel using heat in a flue and then in an industrial process.
  • the underlying principle is that heat is recovered in a heat extraction circuit at different stages in a power station and/or in an industrial plant. Preferably the order of heat recovery is in increasing order of temperature. Heat recovered is then used to heat air and/or fuel entering a burner in the power station in a burner circuit.
  • the embodiment of the apparatus according to the invention shown in Fig. 1 and 2 comprises a combined plant 100 comprising a thermal power plant 1 10 co located with an industrial plant 120 operating an industrial process. This is illustrated with an aluminium electrolysis cell 122 surrounded by a sidelining 124 that is cooled to prevent liquid metal from eroding and destroying the cell. Gases from the process leave through an exhaust conduit 126. Such gases typically comprise fluorides from the melt and carbon dioxide and carbon monoxide resulting from consumption of a carbon anode.
  • the thermal power plant 1 10 burns fuel from a fuel inlet 1 13 through a fuel pre- heater 1 14 wherein the fuel is burned in a burner 1 15 in air from an air inlet 1 1 1 through an air pre-heater 1 12.
  • the burner heats a boiler 1 16 feeding a turbine system 1 18 with steam, preferably superheated steam.
  • the boiler is a complex system of heat exchangers operating at different temperatures similar to what is known in prior art but adapted to handle the efficiency of the embodiments. The remaining heat then passes through the flue 1 19.
  • the industrial plant 120 can be any energy demanding process that generates a lot of waste heat.
  • One such example is metal processing such as aluminium
  • a plant typically comprises a plurality of electrolysis cells 122 but for simplicity a single electrolysis cell is shown.
  • the cell is shown in simplified form with a sidelining 124 that is instrumental in containing liquid electrolyte including aluminium and is kept cooled to maintain a sidelayer, thus avoiding destruction of the electrolysis cell.
  • Exhaust gases are ventilated through an exhaust conduit 126.
  • thermal power plants have been co located with the aluminium plant.
  • One such example is Quatalum, an aluminium smelter plant powered by a 1350 MW natural gas power plant. Electricity from the thermal power plant is fed to the aluminium electrolysis cell (not shown).
  • the two are also connected by a heat exchanger circuit 140 comprising a flue gas circuit 150 and an industrial plant circuit 160 collecting heat from the processes. The heat is then brought into a burner circuit 170.
  • the heat exchanger circuit uses a working medium for transferring heat.
  • the flue gas circuit 150 comprises a flue gas heat exchanger 152.
  • the flue gas heat exchanger is able to raise the temperature of the working medium.
  • the industrial plant circuit 160 comprises an exhaust gas heat exchanger 162 and a sidelining heat exchanger 164.
  • the temperature of the working medium is able to absorb heat efficiently.
  • the temperature is raised to a temperature near the flue gas temperature and then to an even higher temperature in the next stage.
  • Fig. 1 shows a first embodiment where working fluid enters the flue gas circuit and the industrial plant circuit in parallel and the working medium of both branches are collected in a heat collection manifold 142. From there the working medium passes to a heat distribution manifold 144 to the burner circuit 170 where a first part passes working medium to a burner air inlet heat exchanger 172 heating air in the air pre- heater 1 12, and a second part passes working medium to a burner fuel inlet heat exchanger 174 heating fuel in the fuel pre-heater 1 14.
  • Fig. 2 shows a second embodiment where the working fluid enters the flue gas circuit and the industrial plant circuit in series. This provides a series heating of air in flue and then in an industrial process. A heat collection manifold is therefore not required. From there the working medium passes to a heat distribution manifold 144 to the burner circuit 170 where a first part passes working medium to a burner air inlet heat exchanger 172 heating air in the air pre-heater 1 12, and a second part passes working medium to a burner fuel inlet heat exchanger 174 heating fuel in the fuel pre-heater 1 14.
  • valves (not shown) it is possible to switch between the parallel heating shown in Fig. 1 and the series heating shown in Fig. 2.
  • the working medium will flow first through the exchanger in the flue gas (152) before flowing through the heat recovery heat exchangers in the industrial plant circuit (160), i.e series.
  • burner circuit 170 can be changed.
  • the burner circuit is a series connection between burner air inlet heat exchanger 172 and burner fuel inlet heat exchanger 174, in this order or opposite, optionally switchable between the two. In these embodiments a heat distribution manifold is not required.
  • the exhaust gas of the industrial plant can be provided with a secondary circuit comprising further exhaust gas heat exchanger to recover heat remaining after passing through the exhaust gas heat exchanger 162.
  • the heat in the secondary circuit can then be used to provide further pre heating of fuel or air.
  • the working medium can be a type of oil that can withstand the temperatures present in the industrial process.
  • air can be used and enter the air inlet, directly or via the burner circuit. While heat capacity of air is low it can be used to handle very high temperature stages without problems of fluids reaching due to high temperature.
  • a fuel can be used as a working medium and enter the fuel inlet, directly or via the burner circuit. This can be beneficial for working temperature below the decomposition point for a fuel.
  • the exhaust gases comprise oxygen and/or flammable gases. For instances in the exhaust gas from aluminium electrolysis there is some CO present, a gas that is both flammable and also present a health risk. In one embodiment the exhaust gases are separated using membrane filters and
  • the invention finds use in co located systems comprising a power plant providing power to an industrial process. Alternatively energy could also be sent to the grid.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Steering Mechanism (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Air Supply (AREA)

Abstract

L'invention concerne un système et un procédé pour récupérer de la chaleur perdue à partir d'un processus industriel dans une combustion de préchauffage d'air et de carburant. À cet effet, la présente invention comporte une pluralité d'échangeurs de chaleur extrayant de la chaleur à partir de gaz de combustion venant d'une centrale électrique et de la chaleur perdue à partir d'un processus industriel et transférant la chaleur extraite vers l'air, et, éventuellement, le carburant, entrant dans ladite centrale électrique.
PCT/NO2016/050090 2015-05-18 2016-05-13 Système et procédé pour récupérer de la chaleur perdue à partir d'une centrale électrique thermique et industrielle combinée Ceased WO2016186512A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20150613A NO340554B1 (en) 2015-05-18 2015-05-18 Heat recovery
NO20150613 2015-05-18

Publications (1)

Publication Number Publication Date
WO2016186512A1 true WO2016186512A1 (fr) 2016-11-24

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PCT/NO2016/050090 Ceased WO2016186512A1 (fr) 2015-05-18 2016-05-13 Système et procédé pour récupérer de la chaleur perdue à partir d'une centrale électrique thermique et industrielle combinée

Country Status (2)

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NO (1) NO340554B1 (fr)
WO (1) WO2016186512A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023287926A1 (fr) * 2021-07-13 2023-01-19 Pts Power Inc. Système et procédé d'utilisation d'énergie thermique de trajet de gaz d'échappement

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20180376A1 (en) * 2018-03-16 2019-09-17 Cronus Tech As A system for recovery of waste heat from an industrial plant

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DE3505157A1 (de) * 1985-02-15 1986-08-21 Krupp Koppers GmbH, 4300 Essen Verfahren zum erzeugen elektrischer energie in einem kombinierten gas- und dampfturbinenkraftwerk mit vorgeschalteter kohlevergasungsanlage
CN101871392A (zh) * 2010-05-28 2010-10-27 清华大学 一种利用电炉制磷尾气的燃气轮机发电方法及系统
WO2012039624A1 (fr) * 2010-09-22 2012-03-29 Goodtech Recovery Technology As Système et procédé permettant de commander la formation de couche latérale d'une cellule d'électrolyse d'aluminium
WO2012162417A2 (fr) * 2011-05-26 2012-11-29 Praxair Technology, Inc. Séparation d'air et production d'énergie combinées
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CN101871392A (zh) * 2010-05-28 2010-10-27 清华大学 一种利用电炉制磷尾气的燃气轮机发电方法及系统
WO2012039624A1 (fr) * 2010-09-22 2012-03-29 Goodtech Recovery Technology As Système et procédé permettant de commander la formation de couche latérale d'une cellule d'électrolyse d'aluminium
WO2012162417A2 (fr) * 2011-05-26 2012-11-29 Praxair Technology, Inc. Séparation d'air et production d'énergie combinées
WO2013105867A1 (fr) * 2012-01-12 2013-07-18 Goodtech Recovery Technology As Cellule d'électrolyse pour la production d'aluminium comprenant un système de régulation de la température des parois latérales
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023287926A1 (fr) * 2021-07-13 2023-01-19 Pts Power Inc. Système et procédé d'utilisation d'énergie thermique de trajet de gaz d'échappement
US11906248B2 (en) 2021-07-13 2024-02-20 Pts Power Inc. Exhaust gas path heat energy utilization system and method

Also Published As

Publication number Publication date
NO20150613A1 (en) 2016-11-21
NO340554B1 (en) 2017-05-08

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