Solar thermochemical adsorption seasonal efficient energy storage device and method

Abstract

The invention relates to a solar thermochemical adsorption seasonal efficient energy storage device and method, and belongs to the technical field of solar thermal storage. When solar thermal energy is stored in summer, a solar thermal collector, a heating circulating pump, a heating switching valve and a solid-gas chemical reactor heat exchange coil are connected one another, a cooling tower, a cooling circulating pump, a cooling switching valve and a liquid accumulator heat exchange coil are connected one another, and solar efficient thermal storage is realized by converting solar thermal energy into chemical adsorption potential energy; and when solar thermal energy is released for supplying heat in winter, an internal reaction heat cascaded regeneration technology is carried out, a low-temperature reactor heat exchange coil, a heat regeneration circulating pump, a heat regeneration valve and a high-temperature liquid accumulator heat exchange coil are connected one another, a high-temperature reactor heat exchange coil, a heat supply circulating pump, a heat supply valve and a heat user are connected one another, and the warm-up heating to the outside through the stored solar heat is realized by converting chemical adsorption potential energy into thermal energy. Compared with the prior art, the device has the remarkable advantages that the energy storage density is high, the thermal loss is small during the seasonal energy storage period, the energy stored quality is enhanced, and the like.

Description

technical field [0001] The invention relates to a device in the technical field of solar heat storage, in particular to a solar thermochemical adsorption cross-seasonal high-efficiency energy storage device and method. Background technique [0002] Solar energy is an important part of new energy and renewable energy, and the development and utilization of solar energy has great market prospects. However, since solar energy is a low-density energy that changes with time, and has the characteristics of intermittent, dispersed, and unstable, in order to realize the wide application of solar energy, while improving the efficiency of solar energy collection and reducing the cost of the solar energy industry, the implementation of The high-efficiency energy storage technology of solar energy is a necessary means to solve the contradiction between intermittent solar energy, instability and time difference between energy supply and demand. [0003] Solar heat storage systems can be...

AI Technical Summary

Problems solved by technology

In recent years, solar long-cycle cross-season thermal storage technology has been widely valued due to its remarkable energy-saving effect. Judging from the research status at home and abroad, heat loss is a common problem faced by solar long-cycle cross-seasonal thermal storage technology. The heat storage time is very long. Although thermal insulation measures are taken, there is still a large amount of heat loss during the energy storage period, and the higher the storage temperature, the greater the heat loss to the surrounding environment, resulting in a decrease in the temperature grade of the stored heat and a decrease in the total amount of released heat. Seriously affects the long-term inter-season thermal storage performance of solar energy

[0004] After searching the literature of the prior art, the Chinese invention patent of "solar energy cross-seasonal soil buried pipe thermal storage heating device" with the application number CN200920308278. It is used for heating in winter. This method uses the sensible heat of the soil to store solar energy. It belongs to the sensible heat energy storage method. Its disadvantages are low energy storage density, large heat loss during storage, and serious temperature grade drop. The temperature of the heat released in winter is far away. It is much lower than the temperature of heat stored in summer, and an additional set of heat pump units is required to further raise the temperature to meet the heating demand. The system is complicated and the cost is high; the application number is 201010131746. Composite energy storage device" Chinese invention patent, this method uses the mutual conversion of solar thermal energy and chemical adsorption potential energy to realize short-term storage of solar heat, which belongs to the thermochemical energy storage method. Compared with sensible heat and phase change latent heat energy storage technologies, It has significant advantages such as high energy storage density, small heat loss during storage, and combined cooling / heating of solar energy, but its disadvantage is that if it is used for long-term inter-seasonal storage of solar heat, although there is almost no heat loss during storage, Since the ambient temperature in winter is lower than the ambient temperature in summer, according to the univariate characteristics of the chemical adsorption reaction, the temperature of the heat released in winter will be much lower than the temperature of the heat stored in summer, so there is also the problem of a decrease in the temperature of the stored heat.

Images