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Method for converting and storing solar energy with low-hydration magnesium chloride as energy storage working medium

A technology of hydrated magnesium chloride and solar energy, which is applied in chemical instruments and methods, solar thermal power generation, and mechanical power generation by solar energy, etc., can solve the problems of increasing the difficulty of operation and storage, restricting large-scale applications, and complex production processes, and achieving energy efficiency. Unbalanced supply and demand, reversible desorption/adsorption process, and large resource reserves

Active Publication Date: 2013-06-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal lithium and its compounds are scarce strategic resources, and the cost of adsorption media is too high, which limits its large-scale application.
Anhydrous MgCl 2 Has a strong water absorption capacity, however, on the one hand anhydrous MgCl 2 It is difficult to prepare (complex production process and high cost). On the other hand, it is extremely easy to absorb water and is very unstable, which increases the difficulty of operation and storage
At present, there is no report on the conversion and storage of solar energy by using hydrated magnesium chloride as an energy storage working fluid.

Method used

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  • Method for converting and storing solar energy with low-hydration magnesium chloride as energy storage working medium
  • Method for converting and storing solar energy with low-hydration magnesium chloride as energy storage working medium
  • Method for converting and storing solar energy with low-hydration magnesium chloride as energy storage working medium

Examples

Experimental program
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Effect test

Embodiment 1

[0025]Drop into 1 kilogram of bischofite in the primary dehydration fluidized bed 6, under sunlight irradiation, use 10 square meters of flat plate solar heat collectors to heat the bischofite in the primary dehydration fluidized bed 6, and the irradiation time is 5 hours, Control the temperature in the primary dehydration fluidized bed 6 to reach 120°C. In the process, close the shut-off valve 4, open the shut-off valve 5, derive the water vapor generated by the reaction, and use the steam as power generation; when the sunlight intensity is insufficient (18 time), close the shut-off valve 5, open the shut-off valve 4, pass the water vapor in the heat preservation water tank 2 into the primary dehydration fluidized bed 6, and control the water vapor pressure in the primary dehydration fluidized bed 6 to be 1.013×10 3 Pa, the temperature is 25°C, the heat released is passed to the thermal insulation water tank 3, and the generated water vapor is used to generate electricity, whe...

Embodiment 2

[0029] Drop into 0.5 kilogram of bischofite in the primary dehydration fluidized bed 6, under sunlight irradiation, use the flat type solar heat collector of 8 square meters to heat the bischofite in the primary dehydration fluidized bed 6, the irradiation time is 2 hours, Control the temperature in the primary dehydration fluidized bed 6 to be 130°C. In the process, close the shut-off valve 4, open the shut-off valve 5, derive the water vapor generated by the reaction, and use the steam as power generation; when the sunlight intensity is not enough (19 time), close the shut-off valve 5, open the shut-off valve 4, pass the water vapor in the heat preservation water tank 2 into the primary dehydration fluidized bed 6, and control the water vapor pressure in the primary dehydration fluidized bed 6 to be 3.262×10 3 Pa, temperature is 80 DEG C, and the heat that produces passes in the insulation water tank 3, and the steam that produces is used for generating electricity, and where...

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Abstract

The invention aims at providing a method for converting and storing solar energy with low-hydration magnesium chloride as an energy storage working medium and relates to effective utilization of magnesium in salt lakes and storage and conversion of solar energy. The method particularly includes: in the periods when solar radiation is sufficient in the daytime, the solar radiation is received through a flat solar thermal collector, heat is transferred to a one-time dehydration fluidized bed loaded with bischofite (MgCl2 6H2O), the temperature of the bed is increased to the dehydration temperature, then the MgCl2 6H2O loses the crystal water to form the low-hydration magnesium chloride (MgCl2 4H2O), conversion from the solar energy to chemical energy is achieved, and water vapor generated by the reaction is delivered to a steam turbine set to generate electricity; and in the nighttime or when the solar radiation is insufficient, the water vapor is enabled to enter the dehydration fluidized bed where the low-hydration magnesium chloride is stored, under the condition that the temperature and the partial pressure of the water vapor are controlled, the low-hydration magnesium chloride is enabled to be subjected to hydration reaction, the number of crystal water molecules is increased to form MgCl2 6H2O again, absorption (hydration) heat is released, the conversion from chemical energy to thermal energy is achieved, and the released heat is transferred to a heat preservation water tank so as to generate water vapor to drive the steam turbine set to generate electricity.

Description

technical field [0001] The invention belongs to the fields of utilization of magnesium resources in salt lakes and energy storage and conversion, and in particular relates to the conversion and storage of solar energy through the adsorption / desorption process of magnesium chloride hydrate. Background technique [0002] Existing energy storage technology can be divided into sensible heat energy storage, phase change latent heat energy storage and chemical energy storage [Yu Xiaofu, Zhang Zhengguo, Wang Shiping. Research progress of composite heat storage materials [J]. New Energy, 1999, 21(9 ):35-38]. Sensible heat energy storage technology has a simple device and low cost, but its energy storage density is low, and the output temperature fluctuates too much; latent heat energy storage has a high energy storage density, and the heat storage and heat release process is approximately isothermal, but it has not been very good. Solve the supercooling and precipitation problems e...

Claims

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Application Information

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IPC IPC(8): F24J2/34C09K5/16F03G6/06
CPCY02E10/46
Inventor 项顼段雪鄢红
Owner BEIJING UNIV OF CHEM TECH
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