Chemical heat storage and release system

Abstract

This invention relates to a chemical heat storage and release system for performing heat storage and supply. It mainly includes heat storage materials, heat storage equipment, heat release equipment, and storage tanks. The various devices are connected by pipelines to achieve material transfer and energy conversion. The heat storage and heat release equipment can operate independently, realizing waste heat recovery and improving thermal energy utilization. This system can provide green energy and is suitable for large-scale energy storage.

Description

Technical Field

[0001] This invention belongs to the field of green energy and relates to devices for storing and utilizing thermal energy. Background Technology

[0002] Industrial production involves the consumption of heat energy, and sustainable social development requires green production and green energy. Thermal energy storage technology utilizes thermodynamic principles to store heat energy (or cold energy) in the form of thermal energy through specific media or devices, releasing it when needed. Thermal energy storage technology can convert intermittent renewable energy sources (such as solar energy) or industrial waste heat into dispatchable energy, solving the mismatch between heat energy supply and demand in terms of time, space, or intensity.

[0003] Thermal energy storage technologies are mainly divided into three categories: Sensible heat storage: This method stores heat by utilizing the process of temperature rise or fall of a medium. It is simple in principle, low in cost, and has been commercially available on a large scale.

[0004] Latent heat storage (also known as phase change heat storage): This method utilizes the latent heat absorbed and released by phase change materials during the phase change process to store thermal energy. The heat storage density can be 5-10 times that of sensible heat storage.

[0005] Thermochemical heat storage: This method utilizes the heat absorption and release that accompany reversible chemical reactions to store and release heat. The energy storage density is typically 8-10 times that of sensible heat materials.

[0006] Microwaves are short-wavelength electromagnetic waves, ranging from 1 mm to 1000 mm, with a frequency range of 300 MHz to 300,000 MHz. The principle of microwave heating and drying is that polar molecules (water molecules) undergo high-speed oscillation and friction under the influence of high-frequency electromagnetic waves, generating a thermal effect that heats both the interior and surface of the substance simultaneously. Different substances react differently with microwaves, resulting in varying heating effects. Water molecules can oscillate strongly with microwaves, producing a strong thermal effect; therefore, substances containing water can be heated by microwaves at a rapid rate. Microwave heating is fast, with a rapid temperature rise; some substances can be dried in just a few minutes, reducing the moisture content to less than one percent. However, microwave drying has a relatively high energy consumption per unit area; removing 1 kg of water requires 1.2–1.5 kWh of electricity.

[0007] Furthermore, most solid materials have low thermal conductivity, resulting in low drying efficiency in traditional dryers. Integrating and optimizing these traditional heat conduction-based drying technologies with microwave heating that directly heats the material's interior, achieving complementary advantages, can overcome the shortcomings of traditional dehydration and drying technologies, improve dehydration efficiency, and reduce pollutant emissions. This achieves the dual goals of efficient energy utilization and energy conservation and emission reduction. Summary of the Invention

[0008] This invention provides a thermal energy storage and release system, a chemical energy utilization technology used for storing and releasing energy. It can store electrical energy, thermal energy, waste heat, or residual heat, and can be used for waste heat recovery and heat supply. Its advantages lie in its ability to effectively convert between chemical energy and thermal energy, improving resource and energy utilization efficiency, strengthening resource recycling, and providing green energy to society. The chemical energy system described in this invention includes thermal energy materials, thermal energy storage equipment, heat generation devices, and a control system.

[0009] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: A heat storage and release system mainly includes heat storage material, heat storage device 1, storage tank 2, heat release device 3, and storage tank 4. Figure 1 The various devices are connected by pipelines, and materials flow between them through these pipelines. The heat storage material completes energy storage within the heat storage device 1, and is then transported through pipelines to the storage tank 2 for storage. The heat storage material in storage tank 2 is then transported to the heat release device 3 to release the heat energy. Using a heat exchanger, the released heat energy can be supplied to users in the form of hot water, hot oil, or steam. The released material enters the storage tank 4 for storage, and is then transported back to the heat storage device 1 to begin storing energy again; this cycle repeats to achieve the storage and release of heat energy.

[0010] Furthermore, the heat storage device 1 and the heat release device 3 can be used independently to perform energy storage and energy release respectively.

[0011] Furthermore, the heat storage device 1 is selected from dehydration and drying equipment, including rake dryers, drum scraper dryers, paddle dryers, drum dryers, flash dehydration dryers, fluidized bed dehydration dryers, spray dryers, microwave dryers, vacuum dryers, infrared dryers, belt dryers, rotary drum dehydration dryers, disc dryers, airflow dryers, box dryers, and solar drying systems, etc.

[0012] Furthermore, the heat storage device 1 is selected from dehydration and drying equipment, and can be a combination of two or more drying equipment.

[0013] Furthermore, the heat storage device 1 is selected from microwave dehydration and drying equipment. The microwave dehydration and drying equipment combines a conventional dryer with microwave equipment, utilizing microwave radiation to dry the material, thereby enhancing drying and improving drying efficiency. It is selected from microwave rake dryers, microwave drum scraper dryers, microwave paddle dryers, microwave drum dryers, microwave flash dehydrators, microwave fluidized bed dehydrators, microwave spray dryers, microwave dryers, microwave vacuum dryers, microwave infrared dryers, microwave belt dryers, microwave rotary drum dehydration dryers, microwave disc dryers, microwave airflow dryers, microwave box dryers, and microwave solar drying systems, etc.

[0014] Furthermore, the heat storage device 1 is selected from infrared dehydration and drying equipment. This infrared dehydration and drying equipment combines a conventional dryer with infrared heating equipment, using infrared light irradiation to enhance drying of the heat storage material and improve dehydration efficiency. It is selected from infrared rake dryers, infrared drum scraper dryers, infrared paddle dryers, infrared drum dryers, infrared flash dehydrators, infrared fluidized bed dehydrators, infrared spray dryers, infrared microwave dryers, infrared vacuum dryers, infrared dryers, infrared belt dryers, infrared rotary drum dehydration dryers, infrared disc dryers, infrared airflow dryers, infrared box dryers, and infrared solar drying systems, etc.

[0015] Furthermore, the heat storage device 1 can also be a waste heat recovery and heat storage system, which can complete heat storage and also recover waste heat during the heat storage process; such as Figure 2 This waste heat recovery system can also be used independently; this waste heat recovery and storage system mainly includes heat storage materials, heat storage device 1, storage tank 2, storage tank 3, heat exchanger 4, and heat exchanger 5. Figure 2 The various devices are connected by pipes, and materials flow between the devices through these pipes. The heat storage material completes energy storage in the heat storage device 1, and is then transported through pipes to the heat exchanger 4 to exchange heat with the material in the storage tank 3. The cooled material enters the storage tank 2 for storage. The heated material enters the heat storage device 1 to complete heat storage. The steam or hot air flow generated by the heat storage device 1 enters the heat exchanger 5 to exchange heat with the material in the storage tank 3, and the heated material enters the heat storage device 1 to complete heat storage. The steam or hot air flow is condensed and discharged from the outlet 6.

[0016] Furthermore, the heat storage device 1 includes a heat pump that provides heat energy to the heat storage device.

[0017] Furthermore, the heat release device 3 ( Figure 1 Its features include a heat release device containing a quantitative feeding device, selected from mixing vessels, indirect heat exchangers, and regenerative heat exchangers; preferably shell-and-tube heat exchangers, coaxial heat exchangers, spiral feed heat exchangers, reactors, and plate heat exchangers.

[0018] Furthermore, the heat exchanger involved in the heat storage system 1 is selected from indirect heat exchangers and regenerative heat exchangers; preferably, shell-and-tube heat exchangers, jacketed reactors, spiral feed heat releasers, and plate heat exchangers, etc.

[0019] Furthermore, the heat release device 3 is selected from a screw conveyor heat releaser (such as...). Figure 3The device includes a motor 1, fins 2, a heat-conducting fluid material inlet 3, a heat storage material material inlet 4, a support 5, a spiral shaft 6, a heat storage material material chamber 7, fins 8, a heat-conducting fluid material chamber 9, a material inlet 9, a spiral shaft 10, a water supply pipe 11, spiral blades 12, a heat-conducting fluid material inlet 13, a heat storage material material inlet 14, and a spiral shaft 15. The heat storage material enters the spiral feeding heat exchanger through the inlet 9. The spiral blades 12 are fixed on the spiral shaft 10 and rotate with the shaft, pushing the material to move. The spiral shaft 10 and spiral blades 12 are placed in the heat storage material material chamber 7. Water is added to the heat storage material material chamber 7 through the water supply pipe 11 and reacts with the heat storage material to release heat. The motor 1 drives the shaft 10 and spiral blades 12 to rotate, pushing the material to the outlet 4 and flowing out of the heat release device 3. The heat exchange fluid enters the heat-conducting fluid material chamber 9 through the inlet 3 and exchanges heat with the heat storage material material chamber 7. The hot heat-conducting fluid flows out of the heat release device 3 through the outlet 13.

[0020] Furthermore, the heat release device 3 can be used in combination in two or more.

[0021] Furthermore, the heat storage material is selected from oxides, hydroxides, carbonates, nitrates, sulfates, phosphates, chlorides, bromides, double salts, and hydrates of calcium, magnesium, sodium, potassium, barium, lithium, strontium, boron, ammonium, and aluminum; these substances can be used alone or in combination of two or more. Examples include calcium hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, lithium hydroxide, potassium aluminum sulfate, and ammonium aluminum sulfate.

[0022] The heat storage and release system described in this invention utilizes an intelligent control system to control the amount of material added, the rate of heat storage and release, and the heat transfer.

[0023] The heat storage and heat release device described in this invention can be used alone or in combination.

[0024] The novelty of this invention lies in utilizing thermochemical reactions to store and release thermal energy, and employing thermal storage and release devices to achieve the conversion between chemical energy and thermal energy. This enables the recycling and sustainability of chemical thermal energy storage and release, solving the problems of chemical energy storage and industrial utilization, and addressing the spatial and temporal differences in energy utilization. This thermal energy storage and release system can also recover waste heat, store solar and wind energy, and provide green energy. The system features high-density energy storage, zero emissions of pollutants, no risk of combustion or explosion, and is suitable for long-term and large-scale energy storage. It involves multiple disciplines including chemistry, chemical engineering, energy, mechanics, and intelligent control. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the heat storage and release system of the present invention.

[0026] Figure 2 This is a schematic diagram of the thermal storage system of the present invention.

[0027] Figure 3 This is a schematic diagram of the spiral conveying and heat release device of the present invention.

[0028] like Figure 1 As shown: 1. Heat storage device, 2. Storage tank, 3. Heat release device and 4. Storage tank.

[0029] like Figure 2 As shown: 1. Heat storage device, 2. Storage tank, 3. Storage tank, 4. Heat exchanger, 5. Heat exchanger and 6. Discharge port.

[0030] like Figure 3 As shown: 1. Screw conveyor heat release device (such as...) Figure 3 ), motor 1, fins 2, heat-conducting fluid material inlet 3, heat storage material material inlet 4, support 5, spiral shaft 6, heat storage material material chamber 7, fins 8, heat-conducting fluid material chamber 9, material inlet 9, spiral shaft 10, water supply pipe 11, spiral blades 12, heat-conducting fluid material inlet 13, heat storage material material inlet 14 and spiral shaft 15. Detailed Implementation

[0031] To make the content of this invention clearer and more understandable, the technical solution of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1 Combined with appendix Figure 1 Figure 2 and Figure 3 This invention provides a thermal energy storage system mainly composed of a microwave drum dryer, a screw conveyor heat exchanger, a storage tank, a screw conveyor heat releaser, and an intelligent control system, with calcium hydroxide as the thermal storage material. Calcium hydroxide is converted into quicklime within the microwave drum dryer and then enters the storage tank. Using the screw conveyor heat releaser, the steam discharged from the microwave drum dryer exchanges heat with the cold calcium hydroxide material, condensing it into water. The heated calcium hydroxide material then enters the microwave drum dryer for thermal storage. The quicklime in the storage tank enters the screw conveyor heat releaser and reacts with water to release heat energy. This heat energy is absorbed by the water to produce hot water or steam for user use.

[0033] The control system includes flow meters, calorimeters, thermometers, pressure gauges, metering pumps, metering valves, throttle valves, control programs, and control components. Through signal acquisition and information processing, it controls the feeding rate, feeding quantity, temperature, material discharge, and ensures the automatic, safe, and stable operation of the thermal energy system. This is a waste heat recovery and thermal energy storage system.

[0034] Example 2 This invention provides a thermal energy storage system, such as Figure 2In the process, calcium hydroxide heat storage material is converted into quicklime in the drum dryer. The quicklime enters the screw conveyor heat exchanger to exchange heat with the cold calcium hydroxide material. After being cooled, it enters the storage tank. The heated calcium hydroxide material enters the microwave drum dryer to complete the heat storage. The steam discharged from the microwave drum dryer exchanges heat with the cold calcium hydroxide material and condenses into water. The heated calcium hydroxide material enters the microwave drum dryer to complete the heat storage.

[0035] The control system includes flow meters, calorimeters, thermometers, pressure gauges, metering pumps, metering valves, throttle valves, control programs, and control components. Through signal acquisition and information processing, it controls the feeding rate, feeding amount, temperature, material discharge, heat exchange, and ensures the automatic, safe, and stable operation of the thermal energy system. This is a waste heat recovery and thermal energy storage system.

[0036] Example 3 This invention provides a heat release system. Magnesium oxide and water are added to a jacketed reactor, and the reaction is stirred to release heat. Heat transfer oil within the jacket exchanges the heat, carrying the heat away and simultaneously delivering it to the user. After releasing heat, the magnesium oxide is converted into magnesium hydroxide, which is then stored in a storage tank for later use. Utilizing flow meters, calorimeters, thermometers, pressure gauges, metering pumps, metering valves, throttle valves, control programs, and control components, the system controls the feeding rate, feeding quantity, temperature, material discharge, and ensures the automatic, safe, and stable operation of the heat release system through signal acquisition and information processing. This is a heat release system.

[0037] Example 4 This invention provides a thermal energy system, such as Figure 1 The system utilizes an infrared fluidized bed dehydrator to dehydrate magnesium sulfate hydrate. A heat pump absorbs the waste heat generated during fluidized bed dehydration to provide hot air for the fluidized bed. The resulting anhydrous magnesium sulfate is stored in a storage tank and then transported to a spiral feed heat exchanger. Inside the heat exchanger, it reacts with water, releasing heat energy, which is absorbed by the water to produce hot water for heating. The released magnesium sulfate hydrate is then temporarily stored in the storage tank before being transported back to the infrared fluidized bed for further dehydration and energy storage, regenerating anhydrous magnesium sulfate to begin the next cycle. Using flow meters, calorimeters, thermometers, pressure gauges, metering pumps, metering valves, throttle valves, control programs, and control components, the system controls the feeding rate, feeding quantity, temperature, material discharge, and ensures the automatic, safe, and stable operation of the thermal energy system through signal acquisition and information processing. This is a thermal energy storage and release system.

[0038] The above embodiments are only used to illustrate the technical features and applications of the present invention, and are not intended to limit the scope of the present invention. Any technical modifications or substitutions made within the principles and claims of the technical solutions involved in the present invention fall within the technical scope of the present invention.

Claims

1. A heat storage and release system, characterized in that: The main components of the heat storage and release system include heat storage material, heat storage device, heat release device, and storage tank. The heat storage device and heat release device are connected to the storage tank through pipelines, and the heat storage material flows between the pipelines and the equipment. The heat storage material completes energy storage in the heat storage device and is then transported to the storage tank through pipelines for storage. The heat storage material in the storage tank is then transported to the heat release device to release the heat energy. After the heat energy is released, the heat storage material enters another storage tank for storage and then enters the heat storage device to begin storing energy again. The heat release device transfers heat to the user.

2. The heat storage and release system according to claim 1, characterized in that: The heat storage and heat release devices involved can be used independently to perform energy storage and energy release respectively.

3. The heat storage and release system according to claims 1 and 2, characterized in that: The aforementioned heat storage device employs a waste heat recovery and heat storage system, which can both store and recover waste heat (Figure 2). This waste heat recovery and heat storage system mainly includes heat storage materials, a heat storage device, a storage tank, and a heat exchanger. The devices are connected by pipelines, and materials flow between the devices through these pipelines. The heat storage material stores energy within the heat storage device and is then transported through pipelines to the heat exchanger to exchange heat with the material in the storage tank. The cooled material then enters the storage tank for storage. The heated material enters the heat storage device to complete heat storage. The hot airflow generated by the heat storage device enters another heat exchanger to exchange heat with the heat storage material in the storage tank. The heated heat storage material then enters the heat storage device to complete heat storage. The hot airflow is then cooled and discharged.

4. The heat storage and release system according to claims 1, 2 and 3, characterized in that: The heat storage device involved is selected from dehydration and drying equipment, preferably rake dryer, drum scraper dryer, paddle dryer, drum dryer, flash dehydration dryer, fluidized bed dehydration dryer, spray dryer, microwave dryer, vacuum dryer, infrared dryer, belt dryer, rotary drum dehydration dryer, disc dryer, airflow dryer, box dryer, and solar drying system; the dehydration and drying equipment can be a combination of two or more drying equipment.

5. The heat storage and release system according to claims 1, 2 and 3, characterized in that: The heat storage device is selected from microwave dehydration and drying equipment. The microwave dehydration and drying equipment consists of a conventional dryer and a microwave generating device. It utilizes microwave radiation to dry the material, thereby enhancing drying and improving drying efficiency. Preferred types include microwave rake dryers, microwave drum scraper dryers, microwave paddle dryers, microwave drum dryers, microwave flash dehydrators, microwave fluidized bed dehydrators, microwave spray dryers, microwave dryers, microwave vacuum dryers, microwave infrared dryers, microwave belt dryers, microwave rotary drum dehydration dryers, microwave disc dryers, microwave airflow dryers, microwave box dryers, and microwave solar drying systems. The dehydration and drying equipment can be a combination of two or more types of drying equipment.

6. The heat storage and release system according to claims 1, 2 and 3, characterized in that: The heat storage device is selected from infrared dehydration and drying equipment. The infrared dehydration and drying equipment is composed of a conventional dryer and an infrared heating device. Infrared light radiates the material being dried, enhancing the drying process and improving drying efficiency. Preferred types include infrared rake dryers, infrared drum scraper dryers, infrared paddle dryers, infrared drum dryers, infrared flash dehydrators, infrared fluidized bed dehydrators, infrared spray dryers, infrared microwave dryers, infrared vacuum dryers, infrared dryers, infrared belt dryers, infrared rotary drum dehydration dryers, infrared disc dryers, infrared airflow dryers, infrared box dryers, and infrared solar drying systems. The dehydration and drying equipment can be a combination of two or more drying devices.

7. The heat storage and release system according to claims 1, 2, 3, 4, 5 and 6, characterized in that: The aforementioned thermal storage device includes a heat pump, which provides thermal energy to the thermal storage device.

8. The heat storage and release system according to claims 1, 2, 3, 4, 5, 6 and 7, characterized in that: The heat storage material is selected from oxides, hydroxides, carbonates, nitrates, sulfates, phosphates, chlorides, bromides, double salts and their hydrates of calcium, magnesium, sodium, potassium, barium, lithium, strontium, boron, ammonium and aluminum; these substances can be used alone or in combination of two or more.

9. The heat storage and release system according to claim 1, characterized in that: The heat release device is selected from mixing vessels, indirect heat exchangers, and regenerative heat exchangers; preferably, shell-and-tube heat exchangers, jacketed reactors, shell-and-tube heat exchangers, spiral feed heat exchangers, reactors, and plate heat exchangers.

10. The heat storage and release system according to claims 1, 2, 3, 4, 5, 6, 7 and 9, characterized in that: The aforementioned heat storage and release system, heat storage device, and heat release device can all be connected to an intelligent control system.

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