System for using the waste heat of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10066512-B2
Application number	US-201113809991-A
Country	US
Kind code	B2
Filing date	May 24, 2011
Priority date	Jul 20, 2010
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

The application relates to a system for using the waste heat of an internal combustion engine through the Clausius-Rankine cycle. Such system prevents operating medium from the Clausius-Rankine cycle from leaking into combustion air or exhaust air. The system has a first flow channel formed by at least one first limiting component and a second flow channel formed by at least one second limiting component. The system has a fluid-conducting connection to the surroundings or to a receiving chamber from the first limiting component and preferably from the second limiting component, so that in the event of a leak the operating medium is conducted into the surroundings or into the receiving chamber.

First claim

The invention claimed is:

1. An evaporator heat exchanger for evaporating a working medium comprising:
a housing,
a plurality of double disk walls, wherein each double disk wall comprises an upper disk wall and a lower disk wall in direct contact with one another, wherein the upper disk wall and the lower disk wall are directly connected to one another by a first integral bond, wherein each double disk wall comprises a first inlet and a first outlet, wherein a first flow channel flows through each double disk wall from the first inlet, through a flow path formed by and between the upper disk wall and the lower disk wall, and to the first outlet,
a plurality of spacers, wherein each spacer is arranged between two adjacent double disk walls in the region of the first inlet opening and the first outlet opening, wherein each spacer comprises a passage opening which connects the first inlets or the first outlets of adjacent double disk walls,
a plurality of pipes forming a second flow channel, wherein each pipe is arranged between two adjacent double disk walls in a region between the first inlet opening and the first outlet opening, wherein the plurality of pipes have a greater length than the adjacent upper disk wall and the lower disk wall, wherein a base is arranged at an end region of each pipe and a diffuser is arranged on the base, wherein the pipes, the base, and the diffuser are connected by a second integral bond,
a surroundings which is external to a housing of the evaporator heat exchanger,
wherein in the event of a leak in the second flow channel, a fluid in the second flow channel is prevented from entering the first flow channel,
wherein in the event of a leak in the first flow channel, a fluid in the first flow channel is prevented from entering the second flow channel.

2. A system for an internal combustion engine which utilizes waste heat of the internal combustion engine by employing a Clausius-Rankine cycle, the system comprising:
a fluid circuit comprising a working medium,
a pump for conveying the working medium,
a warm fluid flow path comprising a warm fluid,
an evaporator heat exchanger according to claim 1 , wherein the warm fluid evaporates the working medium in the evaporator heat exchanger,
an expansion machine for converting heat energy to mechanical work,
a condenser for liquefying working medium in a vaporous state,
and a collecting and equalizing container for working medium in a liquid state.

3. The system of claim 2 ,
wherein the pump is configured to pressurize the working medium to a range of 40 to 80 bar.

4. The system of claim 2 ,
wherein the working medium is selected from the group consisting of: substantially pure water, R245fa, ethanol, methanol, longer chain C 5 to C 10 alcohols, longer chain C 5 to C 8 hydrocarbons, pyridine, methyl pyridine, trifluoroethanol, hexafluorobenzene, ammonia, or mixtures thereof.

5. The system of claim 4 ,
wherein the working medium is water and the warm fluid is exhaust gas.

6. The system of claim 2 ,
wherein the expansion machine is a turbine or reciprocating piston engine.

7. The system of claim 2 ,
further comprising a recuperator configured to transfer heat from the working medium after flowing through the expansion machine to the working medium upstream of the evaporator heat exchanger.

8. The system of claim 2 ,
further comprising an electric generator configured to be driven by the expansion machine.

9. The evaporator heat-exchanger according to claim 1 ,
wherein the first flow channel comprises a meandering channel bounded by the upper disk wall and the lower disk wall, wherein each double disk wall further comprises a third integral bond, wherein the first integral bond, the third integral bond, the upper disk wall, and the lower disk wall bound a first leakage channel for receiving leaks from the first flow channel, wherein the first leakage channel essentially surrounds the first flow channel, wherein:
(a) the first leakage channel is connected to leakage passage openings in the spacer, wherein the leakage passage openings are connected to a leakage outlet opening leading outside the housing,
or
(b) the first leakage channel is connected to leakage passage openings in the spacer, wherein the leakage passage openings are not connected to a leakage outlet opening such that the first leakage channel is fluid-tight, wherein the first leakage channel comprises a sensor for detecting the fluid or for detecting a change in pressure or temperature in the first flow channel.

10. The evaporator heat exchanger according to claim 9 ,
wherein an upper side and a lower side of each spacer comprises a leakage ring encircling the passage opening in the spacer, wherein the leakage ring is connected to a leakage passage leading to the outside of the housing.

11. The evaporator heat exchanger according to claim 9 ,
wherein (a) the first leakage channel is connected to leakage passage openings in the spacer, wherein the leakage passage openings are connected to a leakage outlet opening leading outside the housing.

12. The evaporator heat exchanger according to claim 9 ,
wherein (b) the first leakage channel is connected to leakage passage openings in the spacer, wherein the leakage passage openings are not connected to a leakage outlet opening such that the first leakage channel is fluid-tight, wherein the first leakage channel comprises a sensor for detecting the fluid or for detecting a change in pressure or temperature in the first flow channel.

13. The evaporator heat exchanger according to claim 1 ,
wherein a ribbed structure or a turbulence insert is arranged between the upper disk wall and the lower disk wall of each double disk wall.

14. The evaporator heat exchanger according to claim 1 ,
wherein the evaporator heat exchanger is manufactured at least partially from stainless steel.

Assignees

• Geskes Peter
• Irmler Klaus
• Pantow Eberhard
• Schmidt Michael
• Mahle Int Gmbh

Inventors

• Geskes Peter
• Irmler Klaus
• Pantow Eberhard
• Schmidt Michael

Classifications

• F02M26/28

  with liquid-cooled heat exchangers · CPC title

• F28D7/0025

  the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes · CPC title

• F28F3/005

  Arrangements for preventing direct contact between different heat-exchange media (F28F3/10 takes precedence) · CPC title

• F02G5/02

  Profiting from waste heat of exhaust gases · CPC title

• F22B1/1807

  using the exhaust gases of combustion engines · CPC title