• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an internal combustion engine with at least one evaporation device (5) and an expansion device (8) having waste heat recovery system (3) for recovering energy from waste heat from the exhaust system (1), wherein in the exhaust system (1) at least one preferably as an SCR catalyst or at least one evaporation device (5) is arranged in the region of the exhaust gas aftertreatment device (2), the expansion device (8) also being arranged in the region of the exhaust aftertreatment device (2). In order to improve the efficiency of the waste heat recovery system (3), it is provided that the expansion device (8) in the exhaust stream of the exhaust system (1), preferably in an exhaust pipe (13) of the exhaust system (1), is arranged and at least partially flows around the exhaust gas ,
    公开号:AT15044U2
    申请号:TGM50112/2016U
    申请日:2016-06-23
    公开日:2016-11-15
    发明作者:Josef Wolkerstorfer
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    description
    Combustion engine with a heat recovery system
    The invention relates to an internal combustion engine with a at least one evaporation device and an expander having waste heat recovery system for recovering energy from waste heat from the exhaust system, wherein in the exhaust system at least one preferably designed as SCR catalyst or oxidation catalyst te exhaust gas treatment device is arranged, wherein in the field the exhaust aftertreatment device at least one evaporation device is arranged, wherein the expansion device is arranged in the region of the exhaust gas aftertreatment device.
    Waste heat recovery systems or WHR systems (WHR-Waste Heat Recovery) for recovering energy from waste heat from the exhaust gas of an internal combustion engine operate, for example, according to the Organic Rankine cycle (ORC Organic Rankine Cycle). In this case, the waste heat is converted into mechanical energy by condensing a guided in a closed circuit working medium alternately at low pressure in a condensing device and evaporated at a higher pressure in a heated by the waste heat of the exhaust evaporation device. The pressure is generated by the exhaust heat in the evaporator and degraded in an expander, such as a turbine, a screw expander or Hubkolbenexpander, with delivery of labor. The required supply of the working medium to the evaporation device is provided by a feed pump through labor. The waste heat recovery system may additionally comprise a regenerator formed by a heat exchanger between the evaporation device and the feed pump, which serves to preheat the working fluid after the feed pump. An internal combustion engine with a heat recovery system operating according to the ORC is known, for example, from WO 2014/083074 A1.
    It is known to arrange the evaporation device of a waste heat recovery system for recovering energy from waste heat from an exhaust system of an internal combustion engine in the region of an exhaust aftertreatment device. Such arrangements are disclosed, for example, in documents EP 1 455 074 A1, EP 1 361 346 A1, EP 1 249 584 A1 or WO 2012/021539 A1.
    In unfavorable conditions, so-called flash condensation (= film condensation of the working medium on the inner walls of the expansion device during filling of the expansion space) and ice formation in the area of the expansion device may occur, which adversely affects the efficiency of the waste heat recovery system.
    From DE 10 2009 045 380 A1 a drive device with a charging device formed by an exhaust gas turbocharger for increasing the pressure and the mass flow of the combustion air of an internal combustion engine is known, which comprises a steam generator for the evaporation of a fluid using the exhaust gas of the internal combustion engine removed thermal Energy has. The steam generator is connected to a steam storage. The exhaust gas turbine of the exhaust gas turbocharger can be acted upon both with exhaust gas, as well as with steam from the steam accumulator.
    DE 10 2009 042 584 A1 describes a system for utilizing waste heat of an internal combustion engine by means of a Rankine cycle process, wherein an expansion machine is arranged near an exhaust pipe of the exhaust system of the internal combustion engine. To avoid damage to the heat exchanger, this has a Ausdehnvolumen.
    Neither in DE 10 2009 045 380 A1, nor in DE 10 2009 042 584 A1 expansion device are flowed around by the hot exhaust gas.
    The object of the invention is to avoid the above disadvantage and to increase the efficiency of the waste heat recovery system.
    According to the invention this is achieved in that the expansion device in the exhaust stream of the exhaust system, preferably in an exhaust pipe of the exhaust system, is arranged and flows around the exhaust gas at least partially.
    In this case, the housing of the expansion device, so to speak, the outer skin of the expansion device, flows around the hot exhaust gas. Surrounded here means that an outer peripheral surface of the expansion device or a surrounding the expansion device and thermally connected with this housing part is wetted over a large area of the hot exhaust gas.
    The expansion device is flowed around by the hot exhaust gas and heated with this, so there is no heat loss of the working fluid in the expansion device to the outer walls of the expansion device. In particular, therefore, no flash condensation occurs. This is ensured because the surface temperature of the expansion space of the expansion device due to the heat transfer is hotter than the working medium or above the saturation temperature of the working medium.
    The expander is flowed around by the hot exhaust gas and heated with this.
    Due to the flow around the housing of the expansion device is wetted over a very large peripheral surface of the hot exhaust gas and passed the exhaust heat in the housing of the expansion device, without a mixing of the working medium is carried out with the exhaust gas.
    The expansion device may be formed for example by a turbine, a screw expander or a Hubkolbenexpander.
    In order not to adversely affect the temperature of the exhaust gas aftertreatment device, the expansion device can be arranged downstream of the exhaust gas aftertreatment device.
    The expansion device drives an output shaft, which is drive-connected to a work machine, for example a generator for converting the mechanical energy into electrical energy. In the context of the invention it is provided that the working machine outside the exhaust stream, preferably outside the exhaust pipe of the exhaust system is arranged. As a result, the thermal load on the machine is kept as low as possible.
    For the best use of the waste heat of the exhaust gas, it is advantageous if the evaporation device in the exhaust stream of the exhaust system, preferably in an exhaust pipe of the exhaust system, is arranged and flows around the hot exhaust gas of the internal combustion engine at least partially. In the preferred embodiment, the working medium in the evaporator is heated or vaporized in the exhaust stream downstream of the position of the expansion device, and thus flows around slightly cooler exhaust gas than the evaporator.
    The evaporation device may be arranged upstream or downstream of the exhaust gas aftertreatment device. In a particularly advantageous embodiment of the invention, the evaporation device is arranged downstream of the expansion device. By heating the expander to a temperature higher than the temperature in the evaporator, the occurrence of flash condensation in the expander can be reliably precluded.
    Alternatively, it is also possible that the exhaust gas aftertreatment device is arranged between the evaporation device and expansion device, wherein preferably the evaporation device is arranged upstream of the exhaust gas aftertreatment device.
    For protection against the corrosive exhaust gas evaporation device and / or expansion device may be surrounded by a protective housing.
    It is particularly advantageous if the protective housing is formed by a arranged in the exhaust stream, preferably in the exhaust pipe, immersion sleeve, in which the expansion device or evaporation device is used with predominant surface contact. This allows easy maintenance. Due to the surface contact between the exhaust gas flow around the exhaust sleeve and the expander or the evaporator, a good heat transfer is possible without that the expander or the evaporator is directly exposed to the exhaust gas.
    The invention is explained in more detail below with reference to the non-limiting figures.
    1, 1a and 2 show schematically arrangements of components of a waste heat recovery system of an internal combustion engine according to the invention in various embodiments, wherein in Fig. 1a, a detail of a modified embodiment of Fig. 1 is shown.
    In the embodiments, functionally identical parts are provided with the same reference numerals.
    In the figures, each part of an exhaust system 1 with an exhaust aftertreatment device 2, for example, a SC Ft catalyst (SCR = Selective Catalytic Reduction) or an oxidation catalyst is shown. To recover energy from waste heat from the exhaust gas, the internal combustion engine has a waste heat recovery system 3, which operates, for example, according to the ORC cycle. In this case, the waste heat of the exhaust gas is converted into mechanical energy by a run in a closed circuit working medium condensed alternately at low pressure in a condenser 4 and evaporated at a higher pressure in a heated by the waste heat of the exhaust evaporation device 5. The pressure is generated by the exhaust heat in the evaporation device 5 and reduced in an expansion device 8, for example a turbine, a screw expander or a reciprocating expander, with delivery of labor. The required supply of the working medium from the tank 19 to the evaporation device 5 is provided by a driven by a motor 6 feed pump 7 at the expense of labor. For preheating the liquid working medium of the feed pump 7 upstream of the evaporation device 5, a regenerator 9 formed by a heat exchanger can be provided. The expansion device 8 is connected via an output shaft 10 to a work machine 11 arranged outside the exhaust gas flow, for example to a generator 12 in drive connection, electric energy being generated by the generator 8 driven by the expansion device 8. Reference numeral 16 denotes lines for the working medium of the waste heat recovery system 3. The reference numerals 17 and 18 denote power lines of the generator 12 and the motor 6 of the feed pump. 7
    Both the evaporator 5, and the expansion device 8 are located in a the exhaust gas aftertreatment device 2 having region of the exhaust pipe 13 of the exhaust system 1 and are flowed around by the hot exhaust gas of the internal combustion engine.
    In the embodiment shown in FIG. 1, evaporator 5 and expansion device 8 are arranged downstream of the exhaust gas aftertreatment device 2, the expansion device 8 being arranged upstream of the vaporization device 5. The evaporation device 5 can be bypassed on the exhaust gas side by a bypass line 14 whose flow is controlled by a control device 15. By heating the expansion device 8 to a temperature higher than the temperature of the working medium in the evaporator 5, the occurrence of flash condensation in the expansion device can be reliably precluded.
    Fig. 2, however, shows a variant in which the exhaust aftertreatment device 2 between the evaporation device 5 and the expansion device 8 of the waste heat recovery system 3 in the exhaust pipe 13 of the exhaust system 1 are arranged and connected to each other with lines 16. For example, the evaporation device 5 is arranged upstream, and the expansion device 8 is arranged downstream of the exhaust gas aftertreatment device 2. Other parts of the waste heat recovery system 3 are not shown.
    Optionally, the expansion device 8 and / or the evaporation device 5 may be protected with a protective housing as protection against the corrosive gases. A separate thermal insulation is not required. Since the expansion device 8 is arranged in the hot exhaust gas flow, there are no insulation losses.
    The protective housing may be formed by a arranged in the exhaust pipe dip tube 20, in which the expansion device 8 and evaporation device 5 is used (Fig. 1a). The outer surface of the expansion device 8 and the evaporation device 5 and the inner surface of the example cylindrical immersion sleeve 20 are in surface contact, so that a good heat transfer between the exhaust gas flow around the exhaust sleeve 20 and the expansion device 8 and the evaporation device 5 is. This allows easy maintenance. Due to the surface contact between the exhaust gas flow around the immersion sleeve 20 and the expansion device 8 and the evaporation device 5, a good heat transfer is possible without the expansion device 8 and the evaporation device 5 is exposed directly to the exhaust gas.
    权利要求:
    Claims (10)
    [1]
    claims
    1. Internal combustion engine with a at least one evaporation device (5) and an expansion device (8) having waste heat recovery system (3) for recovering energy from waste heat from the exhaust system (1), wherein in the exhaust system (1) at least one preferably as SCR catalyst or oxidation catalyst at least one evaporation device (5) is arranged in the region of the exhaust gas aftertreatment device (2), the expansion device (8) also being arranged in the region of the exhaust gas aftertreatment device (2), characterized in that the expansion device (8 ) in the exhaust stream of the exhaust system (1), preferably in an exhaust pipe (13) of the exhaust system (1), is arranged and the exhaust gas is at least partially umström-bar.
    [2]
    2. Internal combustion engine according to claim 1, wherein the expansion device (8) via an output shaft (10) with a working machine (11), preferably a generator (12), drive-connected, characterized in that the working machine (11) outside the exhaust stream, preferably outside the exhaust pipe (13) of the exhaust system (1) is arranged.
    [3]
    3. Internal combustion engine according to claim 1 or 2, characterized in that the evaporation device (5) in the exhaust stream of the exhaust system (1), preferably in an exhaust pipe (13) of the exhaust system (1), is arranged and the exhaust gas is at least partially flowed around.
    [4]
    4. Internal combustion engine according to one of claims 1 to 3, characterized in that the evaporation device (5) downstream of the exhaust gas aftertreatment device (2) is arranged.
    [5]
    5. Internal combustion engine according to one of claims 1 to 3, characterized in that the exhaust gas aftertreatment device (2) between the evaporation device (5) and expansion device (8) is arranged, wherein preferably the evaporation device (5) upstream of the exhaust aftertreatment device (2) is arranged.
    [6]
    6. Internal combustion engine according to claim 5, characterized in that the evaporation device (5) in the inlet region of the exhaust gas aftertreatment device (2) is arranged.
    [7]
    7. Internal combustion engine according to one of claims 1 to 5, characterized in that the expansion device (8) upstream of the evaporation device (5) is arranged in the exhaust stream.
    [8]
    8. Internal combustion engine according to one of claims 1 to 4 or 7, characterized in that the expansion device (8) downstream of the exhaust gas aftertreatment device (2) is arranged in the exhaust stream.
    [9]
    9. Internal combustion engine according to one of claims 1 to 7, characterized in that the evaporation device (5) and / or the expansion device (8) is surrounded by a protective housing.
    [10]
    10. Internal combustion engine according to claim 9, characterized in that the protective housing is formed by a in the exhaust stream, preferably in the exhaust pipe (13), immersion sleeve (20) into which the evaporation device (5) or the expansion device (8) with predominant Surface contact is used. For this 1 sheet drawings
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    同族专利:
    公开号 | 公开日
    DE112016002821A5|2018-03-08|
    AT15044U3|2017-05-15|
    WO2016205848A1|2016-12-29|
    AT517368A1|2017-01-15|
    AT517368B1|2017-08-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2002115505A|2000-10-11|2002-04-19|Honda Motor Co Ltd|Rankine cycle device of internal combustion engine|
    EP2180171B1|2008-10-24|2012-07-04|Behr GmbH & Co. KG|System with a Rankine cycle|
    JP2010138884A|2008-12-15|2010-06-24|Toyota Motor Corp|Heat exchanging device and engine|
    DE102009029684B4|2009-09-23|2020-12-17|Robert Bosch Gmbh|Compact design of a system for utilizing waste heat from an internal combustion engine|
    DE102009042584A1|2009-09-24|2011-04-21|Behr Gmbh & Co. Kg|Heat exchanger and system for using waste heat from an internal combustion engine|
    DE102009045380A1|2009-10-06|2011-04-07|Robert Bosch Gmbh|driving means|
    WO2012021539A2|2010-08-09|2012-02-16|Cummins Intellectual Properties, Inc.|Waste heat recovery system for recapturing energy after engine aftertreatment systems|
    DE102010042405A1|2010-10-13|2012-04-19|Robert Bosch Gmbh|Device and method for waste heat utilization of an internal combustion engine|
    WO2014123572A1|2013-02-06|2014-08-14|Volvo Truck Corporation|Method and apparatus for heating an expansion machine of a waste heat recovery apparatus|
    DE102013205740A1|2013-04-02|2014-10-02|Robert Bosch Gmbh|Waste heat recovery system for an internal combustion engine|KR20190041044A|2014-09-24|2019-04-19|젠텍스 코포레이션|Electro-optic element with ablation-formed indicia and methods for making the same|
    DE102017105612A1|2017-03-16|2018-09-20|Volkswagen Aktiengesellschaft|Drive system and motor vehicle|
    CN112282930A|2020-10-19|2021-01-29|唐为民|Integrated self-supercharging variable compression ratio engine|
    法律状态:
    2020-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20190630 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50534/2015A|AT517368B1|2015-06-24|2015-06-24|Combustion engine with a heat recovery system|
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