WO2017054895A1 - Dispositif de récupération de chaleur perdue - Google Patents

Dispositif de récupération de chaleur perdue Download PDF

Info

Publication number
WO2017054895A1
WO2017054895A1 PCT/EP2016/001360 EP2016001360W WO2017054895A1 WO 2017054895 A1 WO2017054895 A1 WO 2017054895A1 EP 2016001360 W EP2016001360 W EP 2016001360W WO 2017054895 A1 WO2017054895 A1 WO 2017054895A1
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
natural gas
working
working medium
waste heat
Prior art date
Application number
PCT/EP2016/001360
Other languages
German (de)
English (en)
Inventor
Christian Guerlich
Wilhelmus Kok
Steffen Maus
Axel Zuschlag
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2017054895A1 publication Critical patent/WO2017054895A1/fr

Links

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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • 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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/065—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for recovering waste heat from waste heat of a combustion machine in a motor vehicle.
  • Driving fluid is evaporated, wherein said liquid driving fluid is liquefied natural gas or liquefied by liquefied natural gas driving fluid; a turbine to
  • Heat exchanger means is supplied to the expanded drive fluid vapor, wherein the heat exchanger means and liquefied natural gas is supplied to receive heat from the expanded fluid vapor, wherein the temperature of the liquefied
  • Natural gas increases as it flows through the heat exchanger means; a conduit through which the drive fluid at least circulates from the inlet of the evaporator to the outlet of the heat exchanger means; and a line for transmitting
  • the invention is based on the object, an improved device for
  • An inventive device for waste heat recovery from heat loss of a Internal combustion engine in a motor vehicle includes a working circuit in which circulates a working medium, which is using the heat loss of the
  • Working medium can be heated and vaporized, and by means of which the working medium is cooled.
  • cryogenic or cryogenic fuel or fuel can be used instead of the liquefied natural gas. If this document refers to LNG or liquefied natural gas, these terms should also be used
  • Liquefied natural gas for internal combustion engines of motor vehicles is usually maintained at a temperature of -130 ° C or less.
  • the liquefied natural gas is evaporated in the natural gas evaporator. Since this is arranged according to the invention in the working cycle, thereby cooling the working medium in addition.
  • Steam cycle process for example, a Clausius-Rankine process, benefits from a low temperature of the heat sink, in the present case, the branch formed by the condenser and the natural gas evaporator.
  • the additional cooling therefore, the performance of the device for waste heat recovery can be increased.
  • the natural gas evaporator can be done by the natural gas evaporator at certain operating points, a lowering of the temperature of the working medium by about 20 K. This can increase the potential recovery rate from about 5% to, for example, about 6%. This corresponds to an improvement in the recovery rate by 20 percentage points.
  • Fig. 1 is a schematic view of a device for waste heat recovery with an evaporator for liquid natural gas
  • Fig. 2 are schematic T-S diagrams of Carnot processes at various conditions
  • Figure 1 shows a schematic view of a device 1 for waste heat recovery (waste heat recovery), in particular exhaust heat recovery (Exhaust Heat Recovery), from waste heat of an internal combustion engine 10, in particular in a motor vehicle.
  • the device 1 comprises a working cycle 2, heat being converted into kinetic energy by means of a thermodynamic cycle, for example a Clausius Rankine Cycle or Organic Rankine Cycle.
  • a working medium is first compressed by a pump 3 to a higher pressure level. Heat is then supplied to the working medium in a first heat exchanger or first evaporator 4 and / or in a second heat exchanger or second evaporator 5 in order to evaporate it.
  • this high-pressure hot steam is expanded via an expansion machine 6, wherein kinetic energy is released via a shaft, which then contributes to the propulsion of a vehicle or is converted into electrical energy.
  • the working medium is then condensed back into the liquid phase in a condenser 7 and cooled.
  • the capacitor 7 may be arranged in a coolant circuit 13 or cooled by ambient air.
  • a natural gas evaporator 8 for liquefied natural gas LNG is arranged, in which the liquefied natural gas LNG is heated and evaporated by means of the working medium, the working medium being further cooled before it is again supplied to the pump 3.
  • the first evaporator 4 is an exhaust aftertreatment evaporator for recovering waste heat from exhaust gases A in an exhaust aftertreatment system 9 of an internal combustion engine 10
  • Evaporator 5 may be formed as an exhaust gas recirculation evaporator for recovering waste heat from an exhaust gas recirculation system 12.
  • the working cycle 2 can only one
  • Evaporator 4, 5 for supplying heat from exhaust gases or other waste heat of the internal combustion engine 10 have.
  • the waste heat of the internal combustion engine 10 can be partially recycled by means of the device 1 for waste heat recovery in useful mechanical or electrical energy.
  • the proportion of recoverable waste heat depends on the prevailing in the device 1 for waste heat recovery temperatures.
  • An upper operating temperature in at least one evaporator 4, 5 is characterized by a
  • the heat transfer medium for example, the exhaust gas A
  • the aim is to keep the upper operating temperature as high as possible.
  • a lower operating temperature in the condenser 7 depends on the cooling, for example by coolant or ambient air from. It is desired, the lower
  • the fuel-saving potential for example, in a diesel engine, by recovering the exhaust heat, for example, in a range of 5%.
  • Liquefied natural gas LNG for internal combustion engines 10 of motor vehicles is usually maintained at a temperature of -130 ° C or less.
  • the liquefied natural gas LNG is evaporated in the natural gas evaporator 8.
  • the working fluid additionally cools down, which increases the efficiency of the device 1 for waste heat recovery.
  • a lowering of the temperature of the working medium by about 20 K take place. This can increase the potential recovery rate from about 5% to, for example, about 6%. This corresponds to an improvement in the recovery rate by 20 percentage points.
  • the natural gas evaporator 8 may be arranged upstream of the condenser 7 in the working circuit 2.
  • FIG. 2 shows schematic TS diagrams of Carnot processes at different temperature levels, the temperature T being shown over the entropy S. Shown are the upper operating temperature ⁇ ⁇ , and the lower operating temperature T 2 .
  • the heat supplied is designated by Q 3-4 .
  • the area enclosed by the lines between the points P1, P2, P3, P4 corresponds to the amount of heat AQ converted in work.
  • the dissipated heat is designated by Q 1-2 .
  • Diagram is the upper operating temperature ⁇ increased by the difference ⁇ compared to the left diagram and the lower operating temperature T 2 is reduced by the difference ⁇ 2 compared to the left diagram. This increases the area enclosed by the lines between the points P1, P2, P3, P4 and therefore also the amount of heat AQ converted in work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

L'invention concerne un dispositif (1) de récupération de chaleur perdue à partir de chaleur dissipée d'un moteur à combustion interne (10) dans un véhicule automobile, comportant un circuit de travail (2) dans lequel circule un milieu actif qui, en utilisant la chaleur dissipée du moteur à combustion interne (10), peut être réchauffé et peut être évaporé dans au moins un évaporateur (4, 5), une machine à expansion (6) pour la récupération d'énergie mécanique à partir de la chaleur du milieu actif étant prévue dans le circuit de travail (2), un condenseur (7) pour le refroidissement du milieu actif étant disposé dans le circuit de travail (2), un évaporateur de gaz naturel (8) pour du gaz naturel liquéfié (LNG) étant en outre disposé dans le circuit de travail (2), évaporateur dans lequel le gaz naturel liquéfié (LNG) peut être réchauffé et peut être évaporé au moyen du milieu actif, et au moyen duquel le milieu actif peut être refroidi.
PCT/EP2016/001360 2015-09-30 2016-08-09 Dispositif de récupération de chaleur perdue WO2017054895A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015012673.3A DE102015012673A1 (de) 2015-09-30 2015-09-30 Vorrichtung zur Abwärmerückgewinnung
DE102015012673.3 2015-09-30

Publications (1)

Publication Number Publication Date
WO2017054895A1 true WO2017054895A1 (fr) 2017-04-06

Family

ID=55531242

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/001360 WO2017054895A1 (fr) 2015-09-30 2016-08-09 Dispositif de récupération de chaleur perdue

Country Status (2)

Country Link
DE (1) DE102015012673A1 (fr)
WO (1) WO2017054895A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016210782A1 (de) * 2016-06-16 2017-12-21 Robert Bosch Gmbh Turbine
CN106594516B (zh) * 2016-11-28 2018-10-26 哈尔滨工程大学 一种lng动力船冷热能交叉利用系统及实现方法
CN107476897B (zh) * 2017-09-21 2023-05-12 郑州轻工业学院 一种用于lng汽车发动机的余热回收系统及其回收方法
CN111577415B (zh) * 2020-05-19 2022-07-22 西安石油大学 一种lng轻烃分离耦合超临界co2再压缩布雷顿有机朗肯联合循环发电系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1066452A1 (fr) * 1998-03-27 2001-01-10 Exxonmobil Upstream Research Company Production d'energie a partir de gaz naturel liquefie
US7900451B2 (en) 2007-10-22 2011-03-08 Ormat Technologies, Inc. Power and regasification system for LNG
US20120042656A1 (en) * 2010-08-20 2012-02-23 Icr Turbine Engine Corporation Gas turbine engine with exhaust rankine cycle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1066452A1 (fr) * 1998-03-27 2001-01-10 Exxonmobil Upstream Research Company Production d'energie a partir de gaz naturel liquefie
US7900451B2 (en) 2007-10-22 2011-03-08 Ormat Technologies, Inc. Power and regasification system for LNG
US20120042656A1 (en) * 2010-08-20 2012-02-23 Icr Turbine Engine Corporation Gas turbine engine with exhaust rankine cycle

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DE102015012673A1 (de) 2016-04-07

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