CN101408115B - Thermodynamic cycle system suitable for waste heat recovery of engine for automobile - Google Patents

Thermodynamic cycle system suitable for waste heat recovery of engine for automobile Download PDF

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CN101408115B
CN101408115B CN 200810232218 CN200810232218A CN101408115B CN 101408115 B CN101408115 B CN 101408115B CN 200810232218 CN200810232218 CN 200810232218 CN 200810232218 A CN200810232218 A CN 200810232218A CN 101408115 B CN101408115 B CN 101408115B
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temperature
heat
heat exchanger
engine
series
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CN101408115A (en
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何茂刚
张新欣
张颖
曾科
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西安交通大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/16Energy recuperation from low temperature heat sources of the ICE to produce additional power
    • Y02T10/166Waste heat recovering cycles or thermoelectric systems

Abstract

The invention relates to a thermodynamic circulating system which is applicable to the recycling of waste heat of a vehicle engine. The thermodynamic circulating system is a coupling of low-temperature Kalina cycle used for recycling the waste heat of the cooling water of the engine and high-temperature organic Rankine cycle used for recycling the waste heat of the exhaust of the engine and the waste heat of the lubricating oil, and comprises an exhaust heat exchanger, an expansion machine, a heat exchanger, a pump, a lubricating oil heat exchanger, a lubricating oil circulating pump, a cooling water heat exchanger, a cooling water circulating pump, a heat regenerator, a throttle valve, a separator, the expansion machine, a low-pressure condenser and a pump. The system can overcome the defects that the utilization ratio of the waste heat is not high in the traditional utilization method of the waste heat of the engine, thus obviously improving the recycling efficiency of the waste heat of the vehicle engine.

Description

一种适用于车用发动机余热回收的热力循环系统 Suitable for use in a thermodynamic cycle system of the vehicle engine waste heat recovery

技术领域 FIELD

[0001] 本发明属于余热回收技术领域,涉及了一种适用于车用发动机余热回收的热力循环系统。 [0001] The present invention belongs to the technical field of waste heat recovery, relates to a thermodynamic cycle system suitable for vehicle engine waste heat recovery. 该系统采用卡琳娜循环(Kalina Cycle)和有机朗肯循环(Organic Rankine Cycle)耦合的的方式实现车用发动机余热回收利用。 The system uses Kalina cycle (Kalina Cycle) and an organic Rankine cycle (Organic Rankine Cycle) coupled in a manner to achieve heat recovery vehicle engine.

背景技术 Background technique

[0002] 燃料在发动机内燃烧后,其化学能转化为热能,其中一部分通过内燃机循环转变为有用功,主要用于驱动汽车前进;其余部分以发动机冷却余热和尾气余热形式释放给环境。 [0002] After the fuel combustion in the engine, the chemical energy into heat, wherein a portion of an engine cycle by converted into useful work, mainly used for driving the vehicle forward; the rest is released to the engine coolant and heat in the form of exhaust heat to the environment. 根据热力学第二定律,余热能量中除了必须向环境释放的部分,其余部分理论上是可以利用的。 According to the second law of thermodynamics, in addition to some waste heat energy to be released to the environment, the remainder of the theoretically can be utilized.

[0003] 研究表明:发动机转变为有用功的热量约占燃料燃烧发热量(输入热量)的30〜 40 %,冷却余热占20〜25 %,尾气余热占40〜45 %。 [0003] Studies have shown that: the engine heat into useful work about fuel combustion heat (heat input) of 30~ 40%, 20 ~ 25% accounted for cooling waste heat, exhaust heat accounting 40~45%. 也就是说目前只利用了燃料化学能的三分之一左右,另外三分之二左右的能量则通过发动机的冷却水散热和高温尾气排热的形式释放到周围环境。 That is currently using only about one third of the chemical energy of the fuel, additional energy is about two-thirds through the water to the surroundings in the form of exhaust heat and exhaust heat of an engine high temperature cooling.

[0004] 传统的发动机余热利用方法主要有三种:利用发动机余热进行温差发电、利用发动机余热取暖或进行吸收式制冷、利用发动机余热做功。 [0004] The conventional engine waste heat utilization, there are three main methods: for thermoelectric power generation using waste engine heat, using waste engine heat absorption refrigeration or heating, work using the engine waste heat.

[0005] 目前,利用排气温差发电能量转换效率很低。 [0005] Currently, a thermoelectric power generation using the exhaust energy conversion efficiency is very low. 实验中,实际热电转换效率约为2. 12%,而同类装置的转换效率最高只有10%左右;发动机余热取暖系统无法在发动机停止工作的时候使用,且在高寒地区使用时对换热元件要求较高;发动机余热吸收式制冷系统则存在单位质量制冷剂产生的制冷功率小,系统笨重,余热利用率低等缺陷。 In the experiment, the actual thermoelectric conversion efficiency of about 2.12%, while the conversion efficiency is approximately the same means that only 10% maximum; heating system of the engine waste heat can not be used when the engine is stopped, and when the use of heat exchange elements alpine region requirements higher; waste engine heat absorption refrigeration system there is a small cooling capacity per unit of refrigerant mass produced, bulky system, waste heat utilization and low defect. 利用发动机余热做功主要是采用热力循环的方式来回收车用发动机的排气余热,通常采用水作为余热回收循环的工质,然而传统发动机余热回收循环的余热回收效率非常低,原因在于,传统的发动机余热回收循环仅仅单一回收发动机的排气余热,而并未对发动机的冷却水余热与润滑油余热加以回收利用,此外由于排气余热的温度低于工业用朗肯循环的热源温度,采用水作为循环工质使得余热回收效率很低。 Using waste engine heat is mainly work by way of a thermodynamic cycle to recover the exhaust heat of the engine of the vehicle, usually using water as working fluid heat recovery cycle, however, the conventional waste heat recovery cycle engine waste heat recovery efficiency is very low, because the conventional only a single engine waste heat recovery cycle of the engine exhaust gas heat recovery, but does not heat the engine cooling water and the lubricating oil waste heat to be recycled, in addition since the temperature of the exhaust heat source is lower than the temperature of the industrial use of the Rankine cycle, using water such as cycle fluid low heat recovery efficiency.

发明内容 SUMMARY

[0006] 本发明的目的在于提出一种适用于车用发动机余热回收的热力循环系统。 [0006] The object of the present invention is to provide a suitable vehicle thermodynamic cycle of the engine waste heat recovery system. 本热力循环系统采用卡琳娜循环和有机朗肯循环耦合来回收车用发动机的排气余热、冷却水余热和润滑油余热。 This system uses a thermodynamic cycle and the Kalina cycle organic Rankine cycle coupled to an exhaust heat recovery vehicle with the engine cooling water heat and heat the lubricating oil. 其中,卡琳娜循环用于回收温度较低的发动机冷却水余热;有机朗肯循环用于回收温度较高的发动机排气余热及润滑油余热。 Wherein, Karina cycle for the lower engine cooling water waste heat recovery temperature; organic Rankine cycle for high temperature engine exhaust heat recovering heat and lubricants. 利用本热力循环系统,可以同时回收发动机的排气余热、冷却水余热和润滑油余热,显著的提高车用发动机余热回收效率。 With the present thermodynamic cycle system, exhaust heat can be recovered while the engine cooling water heat and heat the lubricating oil, significantly improve the recovery efficiency of the vehicle engine heat.

[0007] 本发明通过下述技术方案实现: [0007] The present invention is achieved by the following technical scheme:

[0008] 车用发动机余热回收热力循环系统是用于回收发动机冷却水余热的低温卡琳娜循环和用于回收发动机排气余热及润滑油余热的高温有机朗肯循环的耦合; [0008] The vehicle-recovery system is a thermodynamic cycle heat engine for low temperature Karina recycling cooling water heat of the engine and for coupling the high-temperature engine exhaust waste heat recovery and heat the lubricating oil of an organic Rankine cycle;

[0009] 所述的用于回收冷却水余热的低温卡琳娜循环中,冷却水热交换器低温侧的进口端与回热器低温侧的进口端并联,并联后进口端与换热器低温侧的出口端串联,并联后出口端与分离器进口串联,分离器的一端出口与膨胀机的进口串联,分离器的另一端出口与回热器的高温侧进口端串联,回热器的高温侧出口端连接节流阀的进口,膨胀机的出口与节流阀的出口并联,并联之后与低压冷凝器高温侧的进口串联,低压冷凝器高温侧的出口与泵进口串联,泵的出口与换热器低温侧的进口端相串联,冷却水换热器高温侧与冷却水循环泵相串联; [0009] The cryogenic Karina for recovering waste heat in the circulating cooling water, the inlet end and the inlet end of the low-temperature side back to the low-temperature side heat exchanger cooling water in parallel to the inlet end of the heat exchanger in parallel to the low-temperature the outlet end of the series, the outlet end of the separator inlet in series after the parallel inlet end of the outlet of the expander separator in series, the high temperature-side inlet at the other end an outlet of the regenerator separators in series, the regenerator temperature an outlet-side throttle valve in parallel with the outlet connected to the outlet end of the inlet throttling valve expander, and then in parallel with the low pressure inlet side of the high-temperature condenser connected in series, the outlet of the pump inlet side of the high-temperature low-pressure condenser in series with the outlet of the pump the low-temperature side heat exchanger inlet end in series, the high-temperature side cooling water heat exchanger and the cooling water circulation pump connected in series;

[0010] 所述的用于回收排气余热和润滑油余热的高温有机朗肯循环中,换热器高温侧的进口端与膨胀机的出口串联,换热器高温侧的出口端与泵进口串联,泵的出口与润滑油热交换器低温侧进口端串联,润滑油热交换器低温侧的出口端与排气换热器低温侧的进口端串联,排气换热器低温侧的出口端与膨胀机的进口串联,润滑油热交换器高温侧与润滑油循环泵串联,排气换热器的高温侧接入发动机尾气。 [0010] The temperature for the organic Rankine cycle heat recovery of exhaust heat and the lubricating oil in the expander outlet and the inlet end of the high-temperature side heat exchanger connected in series, the outlet end of the pump inlet side of the high-temperature heat exchanger series, the outlet of the pump with the oil inlet end of the series low-temperature side heat exchanger, the inlet end the outlet end of the low-temperature side of the exhaust heat exchanger temperature side oil series, the outlet end of the low-temperature side of the exhaust heat exchanger the expander inlet in series with the high-temperature side heat exchanger lubricating oil circulating pump in series, the high temperature exhaust gas heat exchanger side access engine exhaust.

[0011] 用于回收发动机冷却水余热的低温卡琳娜循环采用富氨蒸气,氨含量大于90%, 基本溶液,氨含量为80-90%及富水溶液,氨含量为40-50%的氨水混合物作为循环不同工作阶段的工作介质。 Ammonia [0011] for recovering waste heat of the engine cooling water circulating cryogenic Karina using ammonia-rich vapor, an ammonia content of greater than 90%, the basic solution, an ammonia content of 80-90% and a rich aqueous solution, an ammonia content of 40-50% the mixture as a working medium cycle different working stages.

[0012] 用于回收发动机排气余热及润滑油余热的高温有机朗肯循环采用有机物质作为循环的工作介质。 [0012] For high temperature engine exhaust waste heat recovery and heat the lubricating oil of an organic Rankine cycle using an organic material as a working medium cycle.

[0013] 采用上述技术方案,本发明提出的车用发动机余热回收热力循环系统可同时利用发动机排气余热、发动机冷却水余热和发动机润滑油余热,与传统的只回收发动机排气余热的热力循环系统相比,余热回收效率更高。 [0013] With the above technical solution, the present invention proposes the vehicle engine thermodynamic cycle heat recovery system can simultaneously utilize the exhaust heat of the engine, the engine waste heat and cooling water waste heat engine oil, with the thermodynamic cycle of the engine exhaust heat recovering only conventional compared system, higher heat recovery efficiency. 另外,上述技术方案还通过换热实现高温有机朗肯循环与低温卡琳娜循环之间的热交换,将高温有机朗肯循环做功后工质乏气的热量传递给低温卡琳娜循环从而实现循环工质的预热,进一步提高了余热回收效率。 Further, the above technical solution further heat exchange between the high temperature organic Rankine cycle circulates through a heat exchanger and a low temperature Karina, transferring work after the high-temperature organic Rankine cycle working fluid to a spent low calorie gas Kalina cycle in order to achieve preheat cycle working fluid to further improve the efficiency of waste heat recovery.

附图说明 BRIEF DESCRIPTION

[0014] 图1为本发明的系统流程示意图。 [0014] FIG. 1 is a schematic diagram of the invention system flow.

[0015] 下面结合附图对本发明的内容作进一步详细说明。 [0015] DRAWINGS of the present invention will be further described in detail.

具体实施方式 Detailed ways

[0016] 参照图1所示,将采用氨水作为循环工质的低温卡琳娜循环和采用有机工质的高温有机朗肯循环合理的结合在一起,用以回收车载发动机冷却水余热、排气余热及润滑油余热三部分可以二次利用的能量。 [0016] Referring to FIG. 1, the use of ammonia as low temperature working fluid cycle and Kalina cycle using high temperature organic fluid Rankine cycle organic binding together reasonable, vehicle engine cooling water for recovering heat, the exhaust gas heat three parts and lubricants can heat the secondary energy utilization. 主要部件包括排气换热器1,膨胀机2,换热器3,泵4,润滑油热交换器5,润滑油循环泵6,冷却水热交换器7,冷却水循环泵8,回热器9,节流阀10, 分离器11,膨胀机12,低压冷凝器13和泵14。 The main member 1 comprises an exhaust heat exchanger, an expander 2, a heat exchanger 3, a pump 4, the lubricating oil heat exchanger 5, the lubricating oil circulating pump 6, the cooling water heat exchanger 7, a cooling water circulation pump 8, regenerator 9, the throttle valve 10, separator 11, an expander 12, the low-pressure condenser 13 and a pump 14.

[0017] 用以回收发动机冷却水余热的低温卡琳娜循环主要包括换热器3,冷却水热交换器7,回热器9,节流阀10,分离器11,膨胀机12,低压冷凝器13和泵14。 [0017] for a low temperature engine cooling water recycling Karina heat exchanger 3 mainly includes a cooling water heat exchanger 7, the regenerator 9, the throttle valve 10, separator 11, an expander 12, a low pressure condensate 13 and a pump 14. 采用氨水作为低温卡琳娜循环的工质主要是考虑到氨水临界温度较低的特点;用以回收发动机排气余热及润滑油余热的高温有机朗肯循环主要包括排气换热器1,膨胀机2,换热器3,泵4和润滑油热交换器5。 Using ammonia as the working fluid cycle cryogenic Karina mainly on account of lower critical temperature characteristic ammonia; high-temperature organic Rankine cycle for recovering waste heat of the engine exhaust gas and waste heat of the lubricating oil includes an exhaust heat exchanger 1, an expansion machine 2, a heat exchanger 3, and the lubricating oil pump 4 heat exchanger 5. 鉴于高温循环中冷凝温度的要求以及有机物质Ts图中饱和蒸气线的形状等特点,高温朗肯循环适于采用有机物作为循环的工质;低温卡琳娜循环与高温有机朗肯循环之间的热交换在换热器3中完成从而实现两个循环的耦合;润滑油循环包括润滑油热交换器5和润滑油循环泵6 ;冷却水循环包括冷却水热交换器7和冷却水循环泵8。 In view of the requirements in high-temperature cycle and the condensation temperature Ts FIG organic material vapor saturation line shape, etc., suitable for high-temperature Rankine cycle using a working medium cycle as organics; Kalina cycles between the low temperature and the high temperature organic Rankine cycle coupling the heat exchanger to achieve two complete cycles in the heat exchanger 3; comprising a lubricating oil circulating the lubricating oil heat exchanger 5 and the circulation pump 6; cooling water circulation including a cooling water heat exchanger 7 and the cooling water circulation pump 8.

[0018] 所述的用于回收冷却水余热的低温卡琳娜循环中,冷却水热交换器7低温侧的进口端与回热器9低温侧的进口端并联,并联后进口端与换热器3低温侧的出口端串联,并联后出口端与分离器11进口串联,分离器11的一端出口与膨胀机12的进口串联,分离器11 的另一端出口与回热器9的高温侧进口端串联,回热器9的高温侧出口端连接节流阀10的进口,膨胀机12的出口与节流阀10的出口并联,并联之后与低压冷凝器13高温侧的进口串联,低压冷凝器13高温侧的出口与泵14进口串联,泵14的出口与换热器3低温侧的进口端相串联,冷却水换热器7高温侧与冷却水循环泵8相串联; [0018] The Karina for recovering low-temperature waste heat of cooling water circulating in the low temperature side of the inlet end 9 of the inlet end of the regenerator 7 and the low-temperature side of the cooling water heat exchanger connected in parallel, in parallel to the inlet end of the heat exchanger the outlet end 3 low-temperature side of the series, after the parallel outlet end of the separator 11 imports in series, inlet separator end outlet of the expander 11 and 12 in series, the high temperature inlet side separator and the other end outlet of the regenerator 11 9 end of the series, the outlet end of the high-temperature side regenerator inlet 9 is connected to the throttle valve 10, the throttle valve outlet after the outlet in parallel, parallel expander 10 in series with the inlet 12 of the high-temperature side of the low-pressure condenser 13, a low pressure condenser 13 high-temperature side outlet of the pump inlet 14 connected in series, the low temperature side inlet 3 and the outlet end of the heat exchanger pump 14 in series, the high-temperature side cooling water heat exchanger 7 with the cooling water circulating pump 8 connected in series;

[0019] 所述的用于回收排气余热和润滑油余热的高温有机朗肯循环中,换热器3高温侧的进口端与膨胀机2的出口串联,换热器3高温侧的出口端与泵4进口串联,泵4的出口与润滑油热交换器5低温侧进口端串联,润滑油热交换器5低温侧的出口端与排气换热器1 低温侧的进口端串联,排气换热器1低温侧的出口端与膨胀机2的进口串联,润滑油热交换器5高温侧与润滑油循环泵6串联,排气换热器1的高温侧接入发动机尾气。 [0019] The temperature for the organic Rankine cycle heat recovery of exhaust heat and the lubricating oil, the high-temperature side heat exchanger 3 side inlet and outlet of the expander 2 of the series, the outlet end of the high temperature side of the heat exchanger 3 in series with the pump inlet 4, outlet 5 and the lubricating oil temperature side heat exchanger inlet end of the pump 4 is connected in series with an inlet end an outlet end of the low-temperature side of the exhaust heat exchanger temperature side lubricating oil heat exchanger 5 in series, the exhaust gas a low temperature side of the heat exchanger and the outlet end of the expander inlet 2 connected in series, the high-temperature side of the lubricating oil heat exchanger 5 with the lubricating oil circulating pump in series 6, the high-temperature side of the exhaust heat exchanger 1 of the access engine exhaust.

[0020] 要同时回收车用发动机的高温排气余热、润滑油余热和低温的冷却水余热,考虑到汽油机排气,冷却水和润滑油三项余热的不同特点(主要是三者温度差异较大),适用于车用发动机余热回收的热力循环系统应由用于回收排气余热及润滑油余热的高温有机朗肯循环A和用于回收冷却水余热的低温卡琳娜循环B两部分组成。 [0020] To a vehicle while recovering high-temperature exhaust heat of the engine, the lubricating oil heat and low temperature cooling water heat, considering the gasoline engine exhaust gas, cooling water and lubricating three different characteristics of the waste heat (temperature difference mainly three more large), used in the automotive engine thermodynamic cycle heat recovery system for recovering exhaust heat should be heat and high temperature lubricant a, and an organic Rankine cycle for recovering low-temperature two-part heat of cooling water circulating Karina composition B . 由于采用不同的循环工质,故每个循环由单独的蒸发装置、做功装置、冷凝装置以及循环泵组成。 As a result of the different working fluid cycle, so each cycle by a separate evaporator, work device, condensation device and a circulation pump. C为汽油机的冷却水循环,D为汽油机润滑油循环。 C is a gasoline engine cooling water circulation, D is a gasoline engine oil circulation.

[0021] 本发明所涉及的热力循环系统中,高温有机朗肯循环A的工质首先在润滑油热交换器5中与高温润滑油发生热量交换,润滑油热交换器5除了对润滑油产生冷却作用外,还对高温有机朗肯循环工质起到预热作用,预热后的循环工质进入安装在汽油机排气管上的排气换热器1 (排气换热器1是高温有机朗肯循环工质的主热交换器),在排气换热器1中与排气进行热量交换,充分吸收了排气热量的工质形成高温高压蒸气后进入膨胀机2对外做功,做功后的工质乏气进入换热器3中,在换热器3中向低温卡琳娜循环放热,同时高温有机朗肯循环工质冷凝成为饱和液后进入循环泵4中,完成高温朗肯循环部分。 [0021] The thermodynamic cycle system according to the present invention, the organic Rankine cycle working fluid temperature at the first A of the lubricating oil heat exchanger 5 and the high temperature heat exchanger occurs lubricant, lubricating oil lubricating oil heat exchanger 5 in addition to producing external cooling, but also play the role of preheating the high-temperature organic Rankine cycle working fluid, the preheated working fluid cycle into the gasoline engine mounted on an exhaust pipe of an exhaust gas heat exchanger (high-temperature exhaust heat exchanger 1 is organic Rankine cycle working fluid main heat exchanger), a heat exchanger in the exhaust gas to the exhaust heat exchanger 1, the working fluid sufficiently absorb heat of the exhaust gas formed after the high temperature and pressure steam into the expander 2 of external work, work after the spent working fluid into the heat exchanger 3, air, to the low temperature heat Karina cycle, while the high-temperature organic Rankine cycle working fluid is condensed into saturated liquid in the heat exchanger 3 enters the circulation pump 4, the high temperature complete Long Rankine cycle part.

[0022] 本发明所涉及的热力循环系统中,低温卡琳娜循环的工质为氨含量为80-90%的氨水溶液(以氨含量84%为宜),工质首先通过换热器3,在换热器3中吸收高温有机朗肯循环工质乏气的热量,进行预热。 [0022] The thermodynamic cycle system according to the present invention, the low temperature working fluid cycle Karina ammonia content of 80 to 90% aqueous ammonia solution (ammonia content 84% preferably), by the first refrigerant heat exchanger 3 in the heat exchanger 3 absorbs heat in an organic Rankine cycle working fluid temperature spent gas, preheated. 预热后的循环工质分为氨含量不变的两部分,一部分进入冷却水热交换器7 (冷却水热交换器7低温卡琳娜循环工质的主热交换器),在冷却水热交换器7中吸收冷却水的热量;另一部分工质进入回热器9与从分离器11中分离出来的一股氨含量为40-50%的工质流(以氨含量42%为宜)进行热交换,之后两股工质汇合进入分离器11,在分离器11中,工质被分成两股氨含量不同的工质流,一股氨含量为40-50 %的工质流(以氨含量42%为宜)送至回热器9与在换热器3中完成预热的一部分工质进行热交换,一股氨含量大于90%的工质流(以氨含量96%为宜)送至膨胀机12对外做功,做功之后的乏气与从回热器9流出的一股氨含量为40-50%的工质(以氨含量42%为宜)混合, 重新成为氨含量为80-90%的氨水溶液(以氨含量84%为宜),之后送至低压冷凝器13,在低压冷凝器13中冷凝之后进入 Cycle fluid into the preheated ammonia content of the same two parts, into the cooling water heat exchanger 7 (7 Kalina cycle fluid low temperature cooling water heat exchanger main heat exchanger), the cooling water heat cooling water in the heat exchanger absorber 7; another portion of the working fluid enters the regenerator 9 and the working stream from an ammonia content separated in separator 11 to 40-50% (preferably 42% ammonia content) heat exchanger, the working fluid after merging two streams entering the separator 11, the separator 11, the working fluid is split into two streams of different content of ammonia working stream, an ammonia content of 40-50% of the working medium flow (in preferably ammonia content 42%) 9 to the regenerator heat exchange with a portion of the working fluid fully warmed up in heat exchanger 3, an ammonia content of greater than 90% of the working medium flow (preferably 96% ammonia content ) to the external work expansion machine 12, and after the work spent gas from an ammonia content of 9 regenerator effluent was 40-50% of the working fluid (preferably 42% ammonia content) were mixed, to again become the ammonia content 80-90% aqueous ammonia solution (ammonia content 84% preferably), then fed to a low pressure condenser 13 into the low pressure in the condenser 13 is condensed after 14,完成低温卡琳娜循环部分。 14, completion of the low temperature portion Karina cycle.

[0023] 冷却水循环和润滑油循环分别通过冷却水循环泵8和润滑油循环泵6完成。 [0023] and the lubricant oil circulating cooling water circulation were completed by 8 and cooling water circulating pump for circulating lubricating oil pump 6. [0024] 由于发动机排气温度和冷却水温度差异较大,故在高温有机朗肯循环和低温卡琳娜循环中分别采用物性不同的工质。 [0024] Since the engine cooling water temperature and exhaust temperature difference large, so respectively different physical properties of the working fluid in the high temperature and low temperature organic Rankine cycle Kalina cycle. 在高温有机朗肯循环中采用有机物作为循环工质,而在低温卡琳娜循环中则采用氨水作为循环工质。 The organics were employed as high-temperature cycle organic Rankine cycle working fluid, and in the low-temperature cycle Kalina cycle is used ammonia as the working fluid.

Claims (3)

1. 一种适用于车用发动机余热回收的热力循环系统,其特征在于,车用发动机余热回收热力循环系统是用于回收发动机冷却水余热的低温卡琳娜循环和用于回收发动机排气余热及润滑油余热的高温有机朗肯循环的耦合:所述用于回收冷却水余热的低温卡琳娜循环中,冷却水热交换器(7)低温侧的进口端与回热器(9)低温侧的进口端并联,并联后进口端与换热器(3)低温侧的出口端串联,并联后出口端与分离器(11)进口串联,分离器(11)的一端出口与膨胀机(12)的进口串联,分离器(11)的另一端出口与回热器(9)的高温侧进口端串联,回热器(9)的高温侧出口端连接节流阀(10)的进口,膨胀机(12)的出口与节流阀(10)的出口并联,并联之后与低压冷凝器(13)高温侧的进口串联,低压冷凝器(13)高温侧的出口与泵(14)进口串联,泵(14) 的出口与换热器⑶ A suitable thermodynamic cycle of the engine waste heat recovery system of the vehicle, wherein the vehicle engine thermodynamic cycle heat recovery system for low-temperature engine cooling water Karina recycling and for recovering waste heat of the engine exhaust heat and a high-temperature heat is coupled lubricants organic Rankine cycle: the means for recovering low-temperature waste heat of cooling water circulating Karina, the cooling water heat exchanger (7) and the low temperature side of the regenerator inlet end (9) low temperature parallel inlet end, the inlet end of the parallel heat exchanger (3) to the cold side outlet of the series, the outlet end in parallel to the separator (11) in series inlet separator (11) and the outlet end of the expander (12 ) inlet series, the separator (11) the other end of the regenerator outlet (9) of the high temperature side inlet end of the series, the outlet-side end of the high temperature regenerator (9) connected to the inlet of the throttle valve (10), an expansion (12) the outlet of the throttle valve (10) parallel outlet, parallel to the low after the condenser (13) inlet side of the high-temperature series, the low-pressure condenser (13) and a pump outlet (14) of the inlet side of the high-temperature series, pump (14) and the outlet of the heat exchanger ⑶ 温侧的进口端相串联,冷却水换热器⑵高温侧与冷却水循环泵⑶ 相串联;所述的用于回收排气余热和润滑油余热的高温有机朗肯循环中,换热器(3)高温侧的进口端与膨胀机(2)的出口串联,换热器(3)高温侧的出口端与泵(4)进口串联,泵(4)的出口与润滑油热交换器(5)低温侧进口端串联,润滑油热交换器(5)低温侧的出口端与排气换热器⑴低温侧的进口端串联,排气换热器⑴低温侧的出口端与膨胀机⑵的进口串联,润滑油热交换器(5)高温侧与润滑油循环泵(6)串联,排气换热器(1)的高温侧接入发动机尾气。 Inlet temperature side end of the series, the cooling water heat exchanger and the high temperature side ⑵ ⑶ cooling water circulation pump connected in series; temperature for the organic Rankine cycle heat recovery of exhaust heat and the lubricating oil, the heat exchanger (3 ) outlet temperature side and the expander inlet end (2) in series, the heat exchanger (3) and the outlet end of the high temperature side of the pump (4) connected in series inlet, a pump (4) with the lubricating oil outlet of the heat exchanger (5) inlet temperature side end of the series, the lubricating oil heat exchanger (5) and the low-temperature side outlet end of the exhaust gas heat exchanger to the cold side inlet ⑴ series, the exhaust gas heat exchanger ⑴ outlet end of the expander inlet temperature side ⑵ series, the lubricating oil heat exchanger (5) high-temperature side with the lubricating oil circulating pump (6) connected in series, the high-temperature side of the exhaust heat exchanger (1) access engine exhaust.
2.根据权利要求1所述的适用于车用发动机余热回收的热力循环系统,其特征在于, 用于回收发动机冷却水余热的低温卡琳娜循环采用富氨蒸气,氨含量大于90% ;基本溶液, 氨含量为80-90% ;及富水溶液,氨含量为40-50%的氨水混合物作为循环不同工作阶段的工作介质。 According to claim 1 is applied to a thermodynamic cycle of the engine waste heat recovery system of the vehicle, wherein, for recovering waste heat of the engine cooling water circulating cryogenic Karina using ammonia-rich vapor, an ammonia content of greater than 90%; substantially solution, an ammonia content of 80-90%; and the rich aqueous solution, an ammonia content of 40-50% mixture of ammonia as a working medium cycle different working stages.
3.根据权利要求1所述的适用于车用发动机余热回收的热力循环系统,其特征在于, 用于回收发动机排气余热及润滑油余热的高温有机朗肯循环采用有机物质作为循环的工作介质。 According to claim 1, applied to the thermodynamic cycle of the engine waste heat recovery system of the vehicle, characterized in that the working medium for the high-temperature engine exhaust waste heat recovery and heat the lubricating oil of an organic Rankine cycle as a cycle using an organic material .
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