Heat accumulating steam boiler system based on self-encapsulated shaped phase change heat accumulating material of thermoplastic resin
By encapsulating molten salt phase change materials with thermoplastic resin, the problems of leakage and corrosion of phase change materials have been solved, enabling the safe and stable operation of phase change regenerative steam boilers and grid peak shaving, reducing operating costs and environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU HAICA SOLAR HEAT PUMP
- Filing Date
- 2024-12-23
- Publication Date
- 2026-06-23
AI Technical Summary
In existing phase change regenerative steam boiler systems, inorganic phase change materials pose risks of leakage and corrosion, making them difficult to effectively encapsulate and affecting the safe and stable operation of the system.
A thermoplastic resin self-encapsulated molten salt phase change heat storage material is adopted. The molten salt is adsorbed by encapsulating a porous substrate with thermoplastic resin to form a self-encapsulated phase change material. Combined with heat transfer oil circulation and electric three-way valve control, the safe storage and release of the phase change material can be achieved.
It avoids leakage and corrosion of phase change materials, realizes power grid peak shaving, reduces operating costs, reduces environmental pollution, and improves the safety and economy of the system.
Smart Images
Figure CN224397770U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of phase change energy storage heating technology, and in particular to a heat storage steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change heat storage material. Background Technology
[0002] Currently, industrial energy consumption accounts for about 60-70% of the total energy consumption of the whole society. In the industrial production sector, steam required by industry accounts for more than 30% of the total energy consumption of enterprises. Specifically, in some industries, such as chemical and petroleum processing, steam energy consumption accounts for 50% of the total energy consumption, in tire manufacturing, steam energy consumption accounts for 70% of the total energy consumption, and in textile, printing and dyeing, pulp and paper industries, the proportion of steam energy consumption can even be as high as 80%.
[0003] At present, most steam boilers still use coal, oil and gas. Direct use of fossil energy not only does not comply with the country's "dual carbon" policy for development, but also directly causes a large amount of energy consumption and waste.
[0004] In recent years, the country has vigorously developed renewable energy, and the utilization of solar energy is one of the important ways to develop renewable energy. However, renewable energy is affected by changes in weather, seasons and other factors, and has a certain degree of intermittency and instability. At the same time, the development of renewable energy has also brought imbalance problems to the power grid.
[0005] A thermal storage steam boiler system employing phase change thermal storage materials is a device that converts electrical energy into heat energy, stores high-temperature heat, and releases the heat to generate steam when needed. Combining the characteristics of renewable energy and the power grid, the phase change thermal storage steam boiler system can utilize off-peak electricity at night for heat storage and release heat during peak electricity hours in the daytime, effectively addressing the problem of power grid imbalance.
[0006] However, the phase change materials used in existing phase change thermal storage steam boiler systems can be classified into organic phase change materials, inorganic phase change materials, and composite phase change materials:
[0007] Inorganic phase change materials include hydrated salts and molten salts, among which hydrated salts and molten salts are the most widely used. Molten salts are more commonly used in high-temperature applications, as they have advantages such as high heat storage density and stable phase change. However, at present, inorganic phase change materials are highly corrosive and pose a risk of leakage during the phase change process. Therefore, encapsulating phase change materials to prevent leakage and thus enabling their use in steam boilers is an urgent problem to be solved. Utility Model Content
[0008] The main technical problem solved by this utility model is to provide a thermal storage steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change thermal storage material. The self-encapsulated phase change thermal storage technology avoids leakage and corrosion of the phase change material. Combined with a steam boiler, it uses off-peak electricity for thermal storage, thereby achieving effective grid peak regulation.
[0009] To solve the above-mentioned technical problems, the present invention provides a thermal storage steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change thermal storage material, comprising: a phase change thermal storage tank, a thermal oil heating device, a steam generator, a steam user terminal, a water supply pump, a thermal oil circulation pump, and an electric three-way valve.
[0010] The phase change heat storage box is a thermoplastic resin self-encapsulated molten salt phase change heat storage material type heat storage box.
[0011] The heat exchange medium inlet of the phase change heat storage tank is connected to a thermal oil circulation pump, and the heat exchange medium outlet of the phase change heat storage tank is connected to a steam generator. The steam generator is connected to the steam user terminal. An electric three-way valve is installed on the pipeline between the phase change heat storage tank and the steam generator. The electric three-way valve is connected to a thermal oil heating device, and the thermal oil heating device is connected to the thermal oil circulation pump.
[0012] By controlling the electric three-way valve to switch the flow direction of the heat transfer oil, the heat transfer oil can flow selectively between the steam generator and the heat transfer oil heating device.
[0013] In a preferred embodiment of the present invention, the phase change heat storage box includes a box body, heat exchange tubes, and thermoplastic resin self-encapsulated molten salt phase change heat storage material. The heat exchange tubes are arranged in a circulating manner inside the box body, and the gap between the outside of the heat exchange tubes and the inner wall of the box body is filled by the thermoplastic resin self-encapsulated molten salt phase change heat storage material.
[0014] In a preferred embodiment of this utility model, the heat exchange tube is a plastic-lined metal tube, wherein the plastic lining is PPS or PTFE, and the metal tube is carbon steel.
[0015] In a preferred embodiment of this utility model, the thermoplastic resin self-encapsulated molten salt phase change heat storage material includes thermoplastic resin, a porous substrate and molten salt phase change heat storage material. After the porous substrate adsorbs the molten salt phase change heat storage material, it is encapsulated by thermoplastic resin to form the thermoplastic resin self-encapsulated molten salt phase change heat storage material.
[0016] In a preferred embodiment of this utility model, the heat transfer oil heating device is connected to the heat transfer oil circulation pump through a pipeline to form a heat transfer oil heating circulation loop, and the heat transfer oil circulation pump is a circulating heat transfer oil heating loop circulation pump.
[0017] In a preferred embodiment of this utility model, the steam generator is a heat exchanger.
[0018] In a preferred embodiment of this utility model, a water supply pump is connected to the steam generator for supplying water to the steam generator housing.
[0019] The beneficial effects of this utility model are: by using thermoplastic resin self-encapsulated molten salt phase change heat storage material, leakage and corrosion of phase change material can be avoided during the phase change process. By combining self-encapsulated phase change heat storage technology with steam boilers, heat can be stored using off-peak electricity and moved to peak electricity periods for effective grid peak regulation, reducing operating costs, saving operating expenses, and reducing environmental pollution. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:
[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the thermal storage steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change thermal storage material of this utility model.
[0022] Figure 2 This is a schematic diagram of a preferred embodiment of the phase change heat storage box of this utility model;
[0023] The components in the attached diagram are labeled as follows:
[0024] 1. Phase change heat storage box; 11. Box body; 12. Thermoplastic resin self-encapsulated molten salt phase change heat storage material; 13. Heat exchange tube; 14. Heat exchange medium inlet; 15. Heat exchange medium outlet.
[0025] 2. Thermal oil heating device; 3. Steam generator; 4. Steam user terminal; 5. Water supply pump; 6. Thermal oil circulation pump; 7. Electric three-way valve. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0028] This utility model relates to a preferred embodiment of a regenerative steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change thermal storage material.
[0029] Please see Figure 1-2 The heat storage steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change heat storage material includes a phase change heat storage box 1, a thermal oil heating device 2, a steam generator 3, a steam user terminal 4, a water supply pump 5, a thermal oil circulation pump 6, and an electric three-way valve 7.
[0030] The phase change heat storage box 1 is used to store and release heat energy, the heat transfer oil heating device 2 is used to heat the heat transfer oil, the heat transfer oil heating device 2 is connected to the heat transfer oil circulation pump 6, the heat transfer oil circulation pump 6 is located at the heat exchange medium inlet 14 of the phase change heat storage box, and is used to drive the heat transfer oil to circulate in the system.
[0031] The heat exchange medium outlet 15 of the phase change heat storage box 1 is connected to a steam generator 3. The steam generator 3 is used to convert the heat energy in the heat transfer oil into steam. The steam generator 3 is connected to a steam user terminal 4, which can receive and utilize the generated steam.
[0032] An electric three-way valve 7 is installed on the pipeline between the phase change heat storage tank 1 and the steam generator 3. By controlling the electric three-way valve 7, the flow direction of the heat transfer oil can be switched, so that the heat transfer oil can flow selectively between the steam generator 3 and the heat transfer oil heating device 2.
[0033] Specifically, the first is the phase change heat storage box 1, which includes a box body 11, heat exchange tubes 13, and thermoplastic resin self-encapsulated molten salt phase change heat storage material 12. The box body 11 is provided with circulating heat exchange tubes 13 inside, and the gap between the outside of the heat exchange tubes 13 and the inner wall of the box body 11 is filled by thermoplastic resin self-encapsulated molten salt phase change heat storage material 12.
[0034] Furthermore, the heat exchange tube 13 is a plastic-lined metal tube, with the plastic lining being PPS or PTFE and the metal tube being carbon steel or other metal materials.
[0035] Furthermore, the thermoplastic resin self-encapsulated molten salt phase change heat storage material 12 includes thermoplastic resin, porous substrate and molten salt phase change heat storage material. After the porous substrate adsorbs the molten salt phase change heat storage material, it is encapsulated by thermoplastic resin to form thermoplastic resin self-encapsulated molten salt phase change heat storage material with a phase change point of 160℃-220℃.
[0036] Secondly, there is a heat transfer oil heating device 2, which is connected to the heat transfer oil circulation pump 6 through a pipeline to form a heat transfer oil heating circulation loop. The heat transfer oil circulation pump 6 is a circulating heat transfer oil heating loop type circulation pump.
[0037] Preferably, the heat transfer oil heating device 2 includes an electric heating element, heat transfer oil, and a temperature control section. The electric heating element generates heat, and the heat transfer oil is used as a heat transfer medium to transfer heat. The temperature control section is used to achieve stable control.
[0038] When the electric heating element is powered on, the heat transfer oil heating device begins to convert electrical energy into heat energy and transfer the heat to the heat transfer oil through the electric heating element. The heating temperature of the heat transfer oil is set by the temperature control section. When the temperature of the heat transfer oil reaches the set temperature, the electric heating element stops heating. When the temperature is lower than the set temperature, the electric heating element continues to be powered on to start heating.
[0039] Furthermore, the steam generator 3 is actually a heat exchanger. Circulating high-temperature heat transfer oil transfers a large amount of heat energy to the water in the steam generator housing through the heat exchange channel, causing the water temperature to gradually rise. When the water temperature reaches its boiling point, it begins to vaporize and form steam. The steam generator includes a pressure control device and a water level control device to ensure that the steam pressure and the water level in the housing operate within safe ranges.
[0040] Furthermore, a water supply pump 5 is connected to the steam generator 3 to supply water to the steam generator 3 housing, ensuring that the water level in the steam generator housing is within the normal range during normal operation.
[0041] The working principle of this utility model's regenerative steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change thermal storage material is as follows:
[0042] Thermal storage condition: When the electric three-way valve 7 is opened to the A→C direction, the thermal oil in the thermal oil circulation loop is heated to 220~250℃ by the thermal oil heating device 2, and then circulated to the housing 11 of the phase change heat storage box by the thermal oil circulation pump 6. The high-temperature thermal oil transfers heat to the thermoplastic resin self-encapsulated molten salt phase change heat storage material 12 through the tube wall of the heat exchange tube 13 inside the housing 11. The circulating thermal oil continuously circulates through the housing 11 of the phase change heat storage box 1. The phase change material in the thermoplastic resin self-encapsulated molten salt phase change heat storage material 12 gradually undergoes phase change, storing the high-temperature heat in the form of latent heat. When the phase change material has completely undergone phase change, the stored heat tends to be saturated.
[0043] Simultaneous storage and supply operation: When the electric three-way valve 7 is opened to the A→B direction, the circulating high-temperature heat transfer oil enters the phase change heat storage tank 1 through the heat exchange medium inlet 14 of the tank 11. The heat is first transferred to the thermoplastic resin self-encapsulated molten salt phase change heat storage material 12 through the heat exchange pipe network 13 in the tank 11, and then circulated to the steam generator 3 through the heat exchange medium outlet 15. The water is heated in the steam generator 3, and the water temperature gradually rises and vaporizes to form steam, which is then supplied to the end for use.
[0044] Storage and supply mode: In storage and supply mode, only the heat stored in the phase change heat storage tank 1 is used to circulate and heat the water in the steam generator 3. The electric three-way valve 7 is opened to the A→B direction. At this time, the heat transfer oil heating device 2 stops turning on. When the circulating heat transfer oil passes through the heat exchange tube 13 in the phase change heat storage tank 1, the temperature of the heat transfer oil is lower than the temperature of the thermoplastic resin self-encapsulated molten salt phase change heat storage material 12. At this time, the phase change material undergoes a phase change and transfers the high-temperature heat through the tube wall of the heat exchange tube 13 to the heat transfer oil in the heat exchange tube 13. After absorbing the heat, the heat transfer oil is circulated through the pipeline to the steam generator 3 to heat the water in the steam generator 3 to form steam. This cycle continues until the phase change material in the phase change heat storage tank 1 completely undergoes a phase change and releases heat.
[0045] Self-encapsulated phase change thermal storage utilizes the characteristic of phase change materials to absorb or release heat during the phase change process, thereby achieving energy storage and release. When combined with a steam boiler, it can use electrical energy to heat the phase change material during off-peak hours, storing the heat within it. When steam is needed, the heat in the phase change material is transferred to water through a heat exchanger, causing it to evaporate and generate steam.
[0046] The beneficial effects of this utility model of a thermal storage steam boiler system based on thermoplastic resin self-encapsulated molten salt phase change thermal storage material are:
[0047] The use of thermoplastic resin to self-encapsulate and shape molten salt phase change heat storage materials can avoid leakage and corrosion of phase change materials during the phase change process;
[0048] By combining self-encapsulated phase change thermal storage technology with steam boilers, and utilizing off-peak electricity for thermal storage, operating costs are reduced and operating expenses are saved.
[0049] It helps to eliminate traditional fossil fuel steam boilers and reduce environmental pollution.
[0050] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A heat accumulating steam boiler system based on self-encapsulated shaped phase change heat accumulating material of molten salt based on thermoplastic resin, characterized in that, include: Phase change heat storage tank, thermal oil heating device, steam generator, steam user terminal, water supply pump, thermal oil circulation pump, and electric three-way valve. The phase change heat storage box is a thermoplastic resin self-encapsulated molten salt phase change heat storage material type heat storage box, which includes: a box body and heat exchange tubes arranged in circulation inside the box body. The gap between the inner wall of the box body and the heat exchange tubes is filled with thermoplastic resin self-encapsulated molten salt phase change heat storage material. This material is formed by encapsulating a porous substrate on which the molten salt phase change heat storage material is adsorbed with thermoplastic resin. The heat exchange medium inlet of the phase change heat storage tank is connected to a thermal oil circulation pump, and the heat exchange medium outlet of the phase change heat storage tank is connected to a steam generator. The steam generator is connected to the steam user terminal. An electric three-way valve is installed on the pipeline between the phase change heat storage tank and the steam generator. The electric three-way valve is connected to a thermal oil heating device, and the thermal oil heating device is connected to the thermal oil circulation pump. By controlling the electric three-way valve to switch the flow direction of the heat transfer oil, the heat transfer oil can flow selectively between the steam generator and the heat transfer oil heating device.
2. The heat accumulating steam boiler system based on self-encapsulated shaped phase change heat accumulating material of thermoplastic resin according to claim 1, characterized in that, The heat exchange tube is a plastic-lined metal tube, with the plastic lining being PPS or PTFE and the metal tube being carbon steel.
3. The heat accumulating steam boiler system based on self-encapsulated shaped phase change heat accumulating material of thermoplastic resin according to claim 1, characterized in that, The thermoplastic resin self-encapsulated molten salt phase change heat storage material includes thermoplastic resin, porous substrate, and molten salt phase change heat storage material. After the porous substrate adsorbs molten salt phase change heat storage material, it is encapsulated with thermoplastic resin to form a thermoplastic resin self-encapsulated molten salt phase change heat storage material.
4. The self-packaged shaped molten salt phase change thermal storage material based thermally powered steam boiler system according to claim 1, wherein, The heat transfer oil heating device is connected to the heat transfer oil circulation pump through a pipeline to form a heat transfer oil heating circulation loop. The heat transfer oil circulation pump is a circulating heat transfer oil heating loop type circulation pump.
5. The self-packaged shaped molten salt phase change thermal storage material based thermally powered steam boiler system according to claim 1, wherein, The steam generator is a heat exchanger.
6. The self-packaged shaped molten salt phase change thermal storage material based thermally powered steam boiler system according to claim 1, wherein, A water supply pump is connected to the steam generator to supply water to the steam generator housing.