Double-working-medium expander used for two-stage organic Rankine cycle

Patent metadata

Field	Value
Publication number	US-10801324-B2
Application number	US-201515739760-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 21, 2015
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

Single expander device working with two working media in a two-stage organic Rankine cycle, which has a cylinder body, a rotor disposed inside the cylinder body and provided with a number of slip sheets in a radial direction of the cylinder body, and a rotary shaft fixedly connected to the center of the rotor, with the outer profile of the cylinder body defined by two mathematical equations.

First claim

We claim:

1. A portable internal combustion engine, comprising a double-working-medium expander miniaturized for being disposed inside the engine and used for a two-stage organic Rankine cycle, said double-working-medium expander comprising two asymmetrical oval halves which are unequal in major axis but equal in minor axis to accommodate a low-temperature cycle volume ( 6 ) and a high-temperature cycle volume ( 7 ), respectively, a first fluid inlet ( 8 ) and a first fluid outlet ( 9 ), which are communicated with the low-temperature cycle volume ( 6 ) for expanding a low-temperature working medium with a large flow and a small expansion ratio, and a second fluid inlet ( 10 ) and a second fluid outlet ( 11 ), which are communicated with the high-temperature cycle volume ( 7 ) for expanding a high-temperature working medium with a small flow and a large expansion ratio, wherein the portable internal combustion engine is a diesel engine and has a temperature of 470° C. for the high-temperature working medium and the high-temperature working medium and low-temperature working medium are methylbenzene and R143a respectively, or cyclohexane and R143a respectively.

2. The portable internal combustion engine according to claim 1 , wherein the double-working-medium expander comprises a rotor ( 1 ) and a rotary shaft ( 5 ) which are fixedly connected to each other by a key structure ( 12 ).

3. The portable internal combustion engine according to claim 1 , wherein the double-working-medium expander comprises a plurality of slide slots ( 3 ) and a plurality of slip sheets ( 4 ) with the slide slots formed on the rotor ( 1 ) along the radial direction, into which the slip sheets ( 4 ) can be inserted along the radial direction in a freely sliding manner.

4. The portable internal combustion engine according to claim 1 , wherein the double-working-medium expander used for the two-stage organic Rankine cycle according to the claim 1 , wherein the diameters of the first fluid inlet ( 8 ) and the second fluid inlet ( 10 ) are proportional to the flow values of the working medium entering the low-temperature-stage cycle volume ( 6 ) and the high-temperature-stage cycle volume ( 7 ).

Assignees

• Univ Tianjin

Inventors

• Shu Gequn
• Shi Lingfeng
• Tian Hua
• Huang Guangdai
• Li Xiaoya

Classifications

• F01C1/3445

  the vanes having the form of rollers, slippers or the like · CPC title

• F01C1/3446 Primary

  the inner and outer member being in contact along more than one line or surface · CPC title

• F02G5/02

  Profiting from waste heat of exhaust gases · CPC title

• F04C2250/30

  of the stator · CPC title

• F02G1/0535

  Seals or sealing arrangements · CPC title