Thermochemical energy storage device suitable for island

Abstract

The utility model discloses a thermochemical energy storage device suitable for an island. The thermochemical energy storage device mainly comprises a shell, an energy storage reactor, a calcium carbonate conveying pipeline, a calcium oxide conveying pipeline, a carbon dioxide conveying pipeline and a working medium conveying pipeline, the energy storage reactor consists of a calcining furnace and a carbonizer; a heat storage reaction is carried out in the calcining furnace to realize heat storage; an exothermic reaction is carried out in the carbonizer, so that heat release is realized; the calcium carbonate conveying pipeline, the calcium oxide conveying pipeline and the carbon dioxide conveying pipeline are respectively connected with the calcining furnace and the carbonizer and are used for conveying corresponding materials and realizing the feeding of heat storage and exothermic reactants and the transportation of products; the working medium conveying pipeline is connected with the carbonizer and is used for receiving heat released by the exothermic reaction so as to utilize the stored heat; the device is suitable for island areas, stable storage and cross-season utilization of island solar energy and wind energy can be achieved, unstable electric energy is stored, heat energy is output as needed, and the island power supply and heat supply requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of thermochemical energy storage technology, and in particular to a thermochemical energy storage device suitable for islands. Background Technology

[0002] my country has over 32,000 kilometers of coastline and more than 11,000 islands, approximately 90% of which are without or lack electricity. Currently, over 70% of the electricity supply for these islands relies on diesel generators, resulting in high costs, low energy efficiency, severe environmental pollution, and carbon emissions, significantly hindering their development. To ensure energy supply and sustainable development, adjustments to the island energy structure are essential. While islands possess abundant wind and solar resources with high solar radiation and wind energy density, their actual utilization rate is low due to the volatility, intermittency, and unpredictability of wind and solar energy output, necessitating energy storage devices. Energy storage devices can mitigate the volatility of renewable energy generation and are crucial for achieving efficient renewable energy utilization. Among various energy storage technologies, calcium carbonate / calcium oxide thermal storage systems offer high thermal density, long storage time, safety, stability, and low material costs, with thermal energy output, making them suitable for island applications.

[0003] Therefore, there is an urgent need for a thermochemical energy storage device based on a calcium carbonate / calcium oxide thermal storage system suitable for islands, to achieve efficient utilization of wind and solar energy resources and provide stable electricity and heat energy for island residents. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this invention provides a thermochemical energy storage device suitable for islands. It closely integrates the abundant wind and solar power resources of the island and its surroundings with calcium carbonate / calcium oxide thermal storage. By utilizing the superior performance of the calcium carbonate / calcium oxide thermal storage system, it achieves efficient utilization of wind and solar energy, providing stable and reliable electrical and thermal energy for island production and life, and promoting the sustainable development of the island.

[0005] The technical solution adopted by this utility model to achieve the above objectives is: a thermochemical energy storage device suitable for islands, comprising:

[0006] The outer casing is used to protect the internal equipment, providing moisture and corrosion protection to adapt to the island environment, while also isolating high-temperature components to ensure safety;

[0007] An energy storage reactor, comprising a calcining furnace and a carbonizer, wherein the energy storage reactor involves a calcium carbonate / calcium oxide thermal storage system, undergoes a thermochemical thermal storage reaction to achieve energy storage and release;

[0008] The calcium carbonate conveying pipeline includes a calcium carbonate input pipeline and a calcium carbonate output pipeline. The calcium carbonate conveying pipeline is used to bidirectionally convey calcium carbonate to the energy storage reactor, to add reactants to the heat storage reaction, and to receive exothermic reaction products.

[0009] The calcium oxide conveying pipeline includes a calcium oxide input pipeline and a calcium oxide output pipeline. The calcium oxide conveying pipeline is used to bidirectionally convey calcium oxide to the energy storage reactor, to add reactants for the exothermic reaction, and to receive products from the heat storage reaction.

[0010] The carbon dioxide delivery pipeline includes a carbon dioxide input pipeline and a carbon dioxide output pipeline. The carbon dioxide delivery pipeline is used to bidirectionally deliver carbon dioxide to the energy storage reactor, to introduce reactants for the exothermic reaction, and to receive the products of the heat storage reaction.

[0011] The working fluid conveying pipeline includes a working fluid input pipeline and a working fluid output pipeline. The working fluid conveying pipeline is used to bidirectionally convey the working fluid to the carbonizer, receive the heat released by the exothermic reaction, and then utilize the stored heat.

[0012] Furthermore, in the aforementioned thermochemical energy storage device suitable for islands, one end of the calcium carbonate input pipe, the calcium oxide output pipe, and the carbon dioxide output pipe are respectively connected to the calcining furnace, and the other end passes through the outer shell.

[0013] Furthermore, in the aforementioned thermochemical energy storage device suitable for islands, one end of the calcium carbonate output pipe, calcium oxide input pipe, carbon dioxide input pipe, working fluid input pipe, and working fluid output pipe is connected to the carbonizer, and the other end passes through the outer shell.

[0014] Furthermore, in the aforementioned thermochemical energy storage device suitable for islands, the working medium transported by the working medium input pipeline is water, and the working medium transported by the working medium output pipeline is steam and hot water. The steam can be used for steam turbine power generation, and the hot water can be used for heating, thereby realizing the power supply and heating of the island.

[0015] Furthermore, in the aforementioned thermochemical energy storage device suitable for islands, the calcining furnace is an electrically heated calcining furnace, and the power source is wind power generation equipment and photovoltaic power generation equipment in the island and its surrounding sea area, which are transmitted via cables.

[0016] Furthermore, in the aforementioned thermochemical energy storage device suitable for islands, during the heat storage reaction, the calcining furnace calcines calcium carbonate at a reaction temperature of 925°C, generating calcium oxide and carbon dioxide, converting electrical energy into heat energy and storing it, thus realizing energy conversion and storage.

[0017] Furthermore, in the aforementioned thermochemical energy storage device suitable for islands, when an exothermic reaction is carried out according to energy demand, calcium oxide reacts with carbon dioxide in the carbonizer to generate calcium carbonate at a reaction temperature of approximately 850°C, releasing heat. The released heat heats the working fluid water, generating steam and hot water, thereby releasing the stored energy.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention, based on a calcium carbonate / calcium oxide thermal storage system, enables efficient, cross-seasonal, and stable energy utilization on islands. It converts and stores the electrical energy generated by wind and photovoltaic power generation equipment on the islands and surrounding waters into heat. Leveraging the advantages of the calcium carbonate / calcium oxide thermal storage system—high heat storage density, long storage time, safety, stability, and low cost—it achieves low-cost, cross-seasonal, safe, stable, and efficient energy storage. Based on energy demand, the released heat is used for steam turbine power generation and heating, providing island residents with inexpensive, high-quality, and reliable electricity and heat, meeting the island's production and living needs. This invention also enables efficient utilization of renewable energy, ensuring island energy supply, meeting island energy demands, and producing no pollution emissions, thus optimizing the environment and promoting the green transformation and sustainable development of the islands. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the thermochemical energy storage device suitable for islands according to this utility model.

[0021] 1-Outer shell, 2-Calcination furnace, 3-Carbonator, 4-Calcium carbonate input pipe, 5-Calcium carbonate output pipe, 6-Calcium oxide input pipe, 7-Calcium oxide output pipe, 8-Carbon dioxide input pipe, 9-Carbon dioxide output pipe, 10-Working medium input pipe, 11-Working medium output pipe. Detailed Implementation

[0022] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0023] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this invention, and are explained here together.

[0024] like Figure 1 As shown, this utility model provides a thermochemical energy storage device suitable for islands, comprising:

[0025] Outer casing 1: The outer casing is used to protect the internal equipment from moisture and corrosion to adapt to the island environment, while also isolating high-temperature components to ensure safety.

[0026] The energy storage reactor, including the calcining furnace 2 and the carbonizer 3, involves a calcium carbonate / calcium oxide thermal storage system, where a thermochemical thermal storage reaction occurs to achieve energy storage and release;

[0027] The calcium carbonate conveying pipeline includes a calcium carbonate input pipeline 4 and a calcium carbonate output pipeline 5, which are used to bidirectionally convey calcium carbonate to the energy storage reactor, to add reactants to the heat storage reaction, and to receive exothermic reaction products.

[0028] The calcium oxide conveying pipeline includes a calcium oxide input pipeline 6 and a calcium oxide output pipeline 7, which are used to bidirectionally convey calcium oxide to the energy storage reactor, to add reactants for the exothermic reaction, and to receive the products of the heat storage reaction.

[0029] The carbon dioxide conveying pipeline includes a carbon dioxide input pipeline 8 and a carbon dioxide output pipeline 9, which are used to bidirectionally convey carbon dioxide to the energy storage reactor, to add reactants for the exothermic reaction, and to receive the products of the heat storage reaction.

[0030] The working fluid conveying pipeline includes a working fluid input pipeline 10 and a working fluid output pipeline 11, which are used to bidirectionally convey the working fluid to the carbonizer 3, receive the heat released by the exothermic reaction, and then utilize the stored heat.

[0031] In the thermochemical energy storage device suitable for islands disclosed in this utility model, one end of the calcium carbonate input pipe 4, the calcium oxide output pipe 7, and the carbon dioxide output pipe 9 are respectively connected to the calcining furnace 2, and the other end passes through the outer shell 1 to supply reactants and receive products; one end of the calcium carbonate output pipe 5, the calcium oxide input pipe 6, the carbon dioxide input pipe 8, the working fluid input pipe 10, and the working fluid output pipe 11 are respectively connected to the carbonizer 3, and the other end passes through the outer shell 1 to supply reactants and receive products and heat; the calcium carbonate conveying pipe, the calcium oxide conveying pipe, and the carbon dioxide conveying pipe realize the exchange of substances between the energy storage reactor and the external material storage equipment.

[0032] In the thermochemical energy storage device for islands disclosed in this utility model, the working medium transported by the working medium input pipe 10 is water, and the working medium transported by the working medium output pipe 11 is steam and hot water. The heat released by the carbonizer 3 is used to realize the change of the physical properties of the working medium. The steam can be used for steam turbine power generation, and the hot water can be used for heating, thereby realizing the power supply and heating of the island.

[0033] In the thermochemical energy storage device for islands disclosed in this utility model, the calcining furnace 2 is an electrically heated calcining furnace, and the power source is the wind power generation equipment and photovoltaic power generation equipment of the island and its surroundings. The power is transmitted to the calcining furnace 2 by cable.

[0034] In the thermochemical energy storage device for islands disclosed in this utility model, during the heat storage reaction, the calcining furnace 2 calcines calcium carbonate at a reaction temperature of 925°C, generating calcium oxide and carbon dioxide, converting electrical energy into heat energy and storing it, thus realizing energy conversion and storage; according to energy demand, during the exothermic reaction, calcium oxide and carbon dioxide in the carbonizer 3 react to generate calcium carbonate at a reaction temperature of about 850°C, releasing heat, which heats the working fluid water to generate steam and hot water, thus realizing the release of stored energy.

[0035] The working process of the thermochemical energy storage device suitable for islands disclosed in this utility model is as follows: Electricity generated by wind power and photovoltaic power generation equipment located on the island and its surrounding waters is transmitted to the calcining furnace 2 via cables; the calcining furnace 2 calcines calcium carbonate at a reaction temperature of 925℃, generating calcium oxide and carbon dioxide, thus converting electrical energy into heat energy, which is then stored; the reactant calcium carbonate is input through the calcium carbonate input pipe 4; the calcium oxide and carbon dioxide generated by the heat storage reaction are output through the calcium oxide output pipe 7 and carbon dioxide output pipe 9 respectively, for storage and use in exothermic reactions; according to energy demand, calcium oxide and carbon dioxide react in the carbonizer 3 to generate calcium carbonate at a reaction temperature of approximately 850℃, releasing heat. The released heat heats the working fluid water, generating steam and hot water, thus releasing the stored energy; the exothermic reaction reactants calcium oxide and carbon dioxide... Carbon dioxide is input through calcium oxide input pipe 6 and carbon dioxide input pipe 8, respectively; calcium carbonate produced by the exothermic reaction is output through calcium carbonate output pipe 5 for storage and use in thermal storage reactions; working fluid input pipe 10 inputs working fluid water into the carbonizer to absorb the heat released by the exothermic reaction and generate steam and hot water, which are output through working fluid output pipe 11. The steam can be used for steam turbine power generation, and the hot water can be used for heating, meeting the power and heating needs of the island. This device is based on the thermochemical thermal storage cycle reaction of calcium carbonate / calcium oxide, making full use of the core advantages of the calcium carbonate / calcium oxide thermal storage system, such as high thermal storage density, long thermal storage time, low thermal storage cost, and safety and stability. It can realize the stable storage and cross-seasonal utilization of unstable wind and solar energy resources, providing island residents with stable, reliable, inexpensive and safe electricity and heat, and ensuring the orderly operation of normal production and life on the island.

[0036] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermochemical energy storage device suitable for islands, characterized in that, include: The outer casing (1) is used to protect the internal equipment, prevent moisture and corrosion, adapt to the island environment, and isolate high-temperature components. The energy storage reactor includes a calcining furnace (2) and a carbonizer (3). The energy storage reactor involves a calcium carbonate / calcium oxide thermal storage system, which undergoes a thermochemical thermal storage reaction to achieve energy storage and release. The calcium carbonate conveying pipeline includes a calcium carbonate input pipeline (4) and a calcium carbonate output pipeline (5). The calcium carbonate conveying pipeline is used to convey calcium carbonate bidirectionally with the energy storage reactor, to add reactants for the heat storage reaction, and to receive exothermic reaction products. The calcium oxide conveying pipeline includes a calcium oxide input pipeline (6) and a calcium oxide output pipeline (7). The calcium oxide conveying pipeline is used to convey calcium oxide bidirectionally with the energy storage reactor, to add reactants for the exothermic reaction, and to receive products from the heat storage reaction. The carbon dioxide conveying pipeline includes a carbon dioxide input pipeline (8) and a carbon dioxide output pipeline (9). The carbon dioxide conveying pipeline is used to convey carbon dioxide bidirectionally with the energy storage reactor, to add reactants for the exothermic reaction, and to receive the products of the heat storage reaction. The working fluid conveying pipeline includes a working fluid input pipeline (10) and a working fluid output pipeline (11). The working fluid conveying pipeline is used to convey the working fluid bidirectionally with the carbonizer (3), receive the heat released by the exothermic reaction, and then utilize the stored heat.

2. The thermochemical energy storage device suitable for islands according to claim 1, characterized in that: One end of the calcium carbonate input pipe (4), the calcium oxide output pipe (7), and the carbon dioxide output pipe (9) are connected to the calcining furnace (2), and the other end passes through the outer shell (1).

3. A thermochemical energy storage device suitable for islands according to claim 2, characterized in that: One end of each of the calcium carbonate output pipe (5), calcium oxide input pipe (6), carbon dioxide input pipe (8), working fluid input pipe (10), and working fluid output pipe (11) is connected to the carbonizer (3), and the other end passes through the outer shell (1).

4. A thermochemical energy storage device suitable for islands according to claim 3, characterized in that: The working medium transported by the working medium input pipe (10) is water, and the working medium transported by the working medium output pipe (11) is hot water and steam. The steam can be used for steam turbine power generation, and the hot water can be used for heating, thereby realizing the power supply and heating of the island.

5. A thermochemical energy storage device suitable for islands according to claim 4, characterized in that: The calcining furnace (2) is an electrically heated calcining furnace. The power source is wind power generation equipment and photovoltaic power generation equipment in the island and its surrounding sea area, and the power is transmitted by cable.

6. A thermochemical energy storage device suitable for islands according to claim 5, characterized in that: During the heat storage reaction, the calcining furnace (2) calcines calcium carbonate at a reaction temperature of 925°C, generating calcium oxide and carbon dioxide, converting electrical energy into heat energy and storing it, thus realizing the conversion and storage of energy.

7. A thermochemical energy storage device suitable for islands according to claim 6, characterized in that: According to energy demand, when an exothermic reaction is carried out, calcium oxide in the carbonizer (3) reacts with carbon dioxide to generate calcium carbonate. The reaction temperature is about 850°C, releasing heat. The released heat heats the working fluid water to generate steam and hot water, thereby realizing the release of stored energy.

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