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System for controlling a rankine cycle

a technology of rankine cycle and system, which is applied in the direction of steam engine plants, machines/engines, mechanical equipment, etc., can solve the problems of slowing down the development of this technology for current applications, high cost of such facilities, and phenomena of corrosion and erosion, and achieves the effect of simple and economic

Inactive Publication Date: 2017-05-04
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electricity production system that uses an organic heat-transfer fluid and a Rankine cycle, while protecting the expansion member from damage during operation in a simple and economic way. Further, the invention reduces the delivery rate of the circulation pump when the liquid level in the reservoir reaches the maximum threshold, which improves the efficiency of the system.

Problems solved by technology

At the present time, the cost of such facilities remains high because of the technologies needed for controlling them, and this is slowing the development of this technology for current applications.
The presence of liquid particles at the inlet to the expansion member (turbine) leads to phenomena of corrosion and erosion thereof, and to mechanical stresses liable to damage or destroy it.

Method used

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  • System for controlling a rankine cycle
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  • System for controlling a rankine cycle

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Embodiment Construction

[0040]The invention is now described in greater detail and nonlimitingly in the description which follows.

[0041]Referring to FIG. 1, an electricity production system according to the invention relies on a Rankine cycle comprising an evaporator 1, an expansion member 2, a condenser 3 and a circulation pump 4.

[0042]The Rankine cycle contains a heat-transfer fluid which is preferably an organic compound, for example a hydrocarbon, or a hydrofluorocarbon, or a hydrofluoroolefin, or a mixture of several such compounds.

[0043]Preferred compounds are HFC-134a (1,1,1,2-tetrafluoroethane), HFC-32 (difluoromethane), HFC-125 (pentafluoroethane), HFC-152a (1,1-difluoroethane), HFC-134 (1,1,2,2-tetrafluoroethane), HFC-161 (fluoroethane), HFO-1234yf (2,3,3,3-tetrafluoropropene), HFO-1234ze (1,3,3,3-tetrafluoropropene), HFO-1233zd (1-chloro-3,3,3-trifluoropropene), HFO-1336mzz (1,1,1,4,4,4-hexafluorobutene) in E or Z form, HC-600 (butane), HC-600a (2-methylpropane) and HC-290 (propane).

[0044]The ev...

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Abstract

A system for producing electricity, including a closed circuit of heat-transfer fluid which includes an evaporator, an expansion member, a condenser and a circulation pump, a generator being coupled to the expansion member, in which system a liquid-vapour separator provided with a liquid reservoir is positioned between the evaporator and the expansion member, the system being further provided with a control device configured to empty the reservoir if the liquid level in the reservoir reaches a maximum threshold.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a system for controlling a Rankine cycle and to a method for producing electricity that can be implemented using this system.TECHNICAL BACKGROUND[0002]A Rankine cycle is a system that allows heat energy to be converted into electrical energy. The heat recovered is used to heat and then vaporize a heat-transfer fluid which is then expanded in an expansion member, typically a turbine, powering a generator. The fluid is then condensed so that the cycle can be recommenced.[0003]Rankine cycles are notably used for the production of electricity, for example in electricity power stations. Such cycles generally use water as the heat-transfer fluid.[0004]Organic Rankine cycles (or ORCs) use organic products in place of water. That makes it possible to reduce the size of the facilities and to construct low-power facilities.[0005]At the present time, the cost of such facilities remains high because of the technologies needed for cont...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01K25/08F01K7/16
CPCF01K7/165F01K25/08F01K7/32F01K13/02
Inventor RACHED, WISSAM
Owner ARKEMA FRANCE SA