Low-grade thermally-driven Rankine power generation device with ejector

A low-grade heat and power generation device technology, applied in steam engine devices, machines/engines, mechanical equipment, etc., can solve the problems of low power generation efficiency and poor economy, and achieve high power generation efficiency, increased work, and stable operation.

Inactive Publication Date: 2012-08-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is of great significance for overcoming the shortcomings of low-grade the

Method used

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  • Low-grade thermally-driven Rankine power generation device with ejector
  • Low-grade thermally-driven Rankine power generation device with ejector

Examples

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Example Embodiment

[0031] Example 1

[0032] Such as figure 1 As shown, a low-grade heat-driven Rankine power generation device with ejector of the present invention uses a mixture of carbon dioxide (R744 boiling point at normal pressure: -78.5°C) and acetone (boiling point at normal pressure: 56.5°C) as the working fluid. It consists of generator 1, expander 2, generator (not marked in the figure), ejector 3, absorber 4, circulating pump 5 and solution heat exchanger 6. Generator 1 is equipped with generator steam outlet and generator solution The inlet, the generator solution outlet, and the driving heat source inlet and outlet connected with the driving heat source. The ejector 3 is provided with a jet fluid inlet, a mixed liquid outlet and a working fluid inlet, and the absorber 4 is provided with a cooling coil, the cooling plate The inlet and outlet of the tube are connected with the source of the cooling medium, and the cooling medium filled in the cooling coil is water.

[0033] The steam o...

Example Embodiment

[0036] Example 2

[0037] A mixture of ammonia (R717 boiling point at normal pressure is -33.5°C) and water (boiling point at normal pressure is 100°C) is used as the working fluid. The structure of the power generation device, the connection mode of each component, and the working process are the same as those in Example 1.

[0038] This embodiment uses low-grade heat at about 120°C, the heat conversion efficiency can be increased by about 20-30%, the mechanical power consumed by the circulating pump can be reduced by about 10-25%, and the net power generation efficiency of the device can be increased by about 25-55% at the maximum. .

Example Embodiment

[0039] Example 3

[0040] Using a mixture of tetrafluoroethane (R134a boiling point -26°C under normal pressure) and tetraglyme (DME boiling point 275.3°C under normal pressure) as the working fluid, the structure of the power generation device, the connection method of each component and The working process is the same as in Example 1.

[0041] In this embodiment, low-grade heat at about 60°C is used, the heat conversion efficiency can be increased by about 20-35%, the mechanical power consumed by the circulating pump can be reduced by about 20-40%, and the net power generation efficiency of the device can be increased by about 30-70%. .

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Abstract

The invention discloses a low-grade thermally-driven Rankine power generation device with an ejector, which comprises a generator, an expansion machine, a power generator, an ejector, an absorber, a circulating pump and a solution heat exchanger. The circulating pump transports the working fluid required to complete an absorption process in the absorber to the generator through the low-temperature side of the solution heat exchanger; an absorbent solution on the high-temperature side of the solution heat exchanger is cooled and then fed into the ejector; the working fluid in the generator is heated by an input heating source so as to generate high-pressure working steam; the high-pressure working steam is fed into the expansion machine for doing work through expanding; the working steam subjected to expansion is fed into the ejector, and is injected by the working fluid in the ejector; and finally, the working steam is fed into the absorber to complete the absorption process. According to the invention, the expansion machine can do more mechanical work in the process of expansion, so that the heat conversion efficiency is higher; and the mechanical work consumed in the process of transporting the solution subjected to absorption to the generator by the circulating pump is obviously reduced, therefore, the net power generation efficiency of the whole device is greatly improved.

Description

technical field [0001] The invention relates to a low-grade heat-driven power generation device, in particular to a low-grade heat-driven Rankine power generation device with an injector. Background technique [0002] In the process of industrial production, it is often accompanied by a large amount of waste heat and waste heat discharge. Low-grade heat with a temperature below 230°C exists widely and in large quantities, such as gas turbines, metallurgical industries, cement industries, petrochemical industries, and food processing industries. A large amount of low-grade waste heat is discharged . For these waste heat, the traditional technology is difficult to use and the economy is extremely poor. Therefore, it is often discharged directly to the environment, which leads to low energy utilization and thermal pollution to the environment. [0003] Converting low-grade heat into electricity is a promising application. At present, some researchers have studied the applicat...

Claims

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Application Information

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IPC IPC(8): F01K27/02F01K25/00
Inventor 何一坚朱祖文陈光明松鹏
Owner ZHEJIANG UNIV
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