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Apparatus and method for storing thermal energy and generating electricity

A heat energy and heat storage technology, applied in wind power generation, thermal storage equipment, solar thermal power generation, etc., can solve problems such as poor reciprocating efficiency

Inactive Publication Date: 2007-04-18
ABB RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Despite the above advantages, electrothermal energy storage is still not an option for most applications, as these advantages are offset by poor reciprocating efficiency (from electricity to electricity)

Method used

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  • Apparatus and method for storing thermal energy and generating electricity
  • Apparatus and method for storing thermal energy and generating electricity
  • Apparatus and method for storing thermal energy and generating electricity

Examples

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Embodiment Construction

[0046] Figure 1 schematically shows a system according to the invention for supplying thermal energy to a thermodynamic machine. It comprises a heat storage device 1 , a first heat transfer device 2 for transferring thermal energy from the device 1 to a thermodynamic machine 3 . A first heat generating device 4 converts electrical energy into heat, while a second heat generating device 5 is provided for adding thermal energy to the machine 3 .

[0047] Figure 2 shows the main components of the system for generating electricity based on the system for supplying thermal energy to thermodynamic machines according to the invention. The thermal storage device or unit 1 comprises a thermal storage material 11 surrounded by a suitable thermal insulation system 12 and is thermally coupled to a first working fluid circuit 21 via a heat exchanger 22 . The first circuit 21 comprises a first working fluid circulating in a suitable pipe arrangement between the heat exchanger 22 and the th...

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Abstract

Because the efficiency of the thermal energy storage technology is inherently restricted, its beneficial use is limited to very particular economic boundary conditions, i.e. a large difference between the value of electricity going into the unit and the value of electricity coming out of the unit. With the reduction in wind power equipment prices and the cost of fossil fuels and / or their combustion products this is occasionally the case for wind power. Wind is a free fuel and the value of wind power when there is too little load demand is essentially zero, and the value of wind power when there is demand is considerable indeed. Under these circumstances, a combination of electrothermal energy storage and combustion of (fossil) fuels as an auxiliary heat source provides for a cost efficient system for storing energy and an economical way of generating electricity.

Description

technical field [0001] The invention relates to the fields of energy storage and power generation. It derives from a system for supplying thermal energy to a thermodynamic machine for generating electricity and a method for generating electricity in response to an electricity demand as described in the preamble of claim 1 . Background technique [0002] Significant renewable energy sources for power generation have historically been intermittent. The wind blows or it doesn't blow, the sun shines or it doesn't. If power production from these intermittent sources must be continuous, energy storage units are required that store energy during periods of surplus supply and withdraw energy from it as electrical demand exceeds supply. Furthermore, if periods of undersupply persist for very long periods, energy storage units of considerable size may be required in order to support the power during such periods, as a result, such power generation systems are often supplemented with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D9/02F02C6/14F02C7/10F03D9/00
CPCF05B2220/60Y02E10/46F03D9/02Y02E10/725F02C7/10Y02E70/30Y02E60/145F05D2220/60F28D20/021F03D9/006F02C6/14F03D9/18F03D9/22Y02E10/72Y02E60/14Y02P90/50F03D9/255
Inventor C·奥勒D·查托尼M·拉克纳
Owner ABB RES LTD
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