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Method and apparatus for storing energy in alkaline solution

A technology for storing energy and lye, applied in the field of energy storage in sodium hydroxide solution, which can solve problems such as adverse effects and high development costs

Active Publication Date: 2016-10-26
BW能源系统有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method are that sites for pumped storage power plants are not available everywhere and high development costs and adverse effects on nature

Method used

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  • Method and apparatus for storing energy in alkaline solution

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Embodiment Construction

[0090] According to the method according to the invention and the device related thereto by means of figure 1 Taking sodium hydroxide solution (NaOH) as an example, it is schematically described as follows:

[0091] The basis for the illustration is that with NaOH / kg lye in the concentration range x 1 = 0.40kg of lean solution to x 2 The desorption cycle / absorption cycle (Z) of rich solution = 0.74 kg was calculated to estimate the mass balance and energy balance. About 1 kg of NaOH means that in one cycle 2.50 kg of lean liquid is decomposed into 1.15 kg of water vapor and 1.35 kg of lean liquid by recycled supply of heat, and conversely 1.15 kg of water is absorbed in 1.35 kg of rich liquid by absorption in discharge In hot conditions, 2.50 kg of lean solution was formed.

[0092]The boiling point pressure of the lye is determined in this example at 1 bar (corresponding to a saturated steam temperature of 100° C.). In the isobaric mode of operation, a lean liquid boiling...

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Abstract

The invention relates to a method and an apparatus for storing energy in alkaline solution for the purpose of qualifying regenerative energy, in particular from wind turbines and photovoltaic systems, for demand-based supply to consumers and/or for storing temporary excess capacities from conventional energy management by absorption and desorption of steam in or from alkaline solutions, for example sodium hydroxide solution, wherein the electrical energy is coupled in by electric drives for compressing (1.10) the steam from the desorption and the recovery of the coupled-in energy is implemented by the use of the heat from absorption for heating and flash distillation (2.3) and technical work-performing expansion (7, 8) of the flash steam to the pressure level of the absorption. The advantage of the invention consists in the location-independent storage of energy with a high energy density, in comparison with the prior art, up to a working capacity which has until now only been achieved by pumped-storage hydroelectricity plants.

Description

technical field [0001] The invention relates to a method and a device for storing energy by desorption and absorption of water vapor in alkaline solutions, such as metal hydroxides or metal salts, preferably in aqueous solution, in particular in sodium hydroxide solutions. Background technique [0002] Fields of application of the invention are in towns, in industry, in industry and in transport for the purpose of balancing the supply and demand of electrical and thermal energy by means of steam, gas turbine and engine power plants and thermal power plants and by Photovoltaic installations and wind power installations are converted into energy storage power plants or energy storage thermal power plants to store electrical and / or thermal energy in the energy supply system. [0003] The main task of energy supply in the 21st century is to replace fossil fuels and atomic fuels by renewable energy from the sun. The concept of "solar regenerative energy" is currently used to dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K3/12F01K5/02F01K25/06F22B3/04F28D20/00
CPCF01K3/12F01K5/02F01K25/065F22B3/04F28D20/0034Y02E60/14Y02E70/30
Inventor B·M·沃尔弗
Owner BW能源系统有限公司
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