A superimposed energy storage device using waste heat and abundant electric energy

Abstract

This utility model discloses a superimposed energy storage device utilizing waste heat and surplus electrical energy, comprising a high-temperature kiln and, sequentially arranged side-by-side, an air electric heater, a hot air thermal storage furnace A, a hot air thermal storage furnace B, a hot air thermal storage furnace C, and a waste heat boiler. The high-temperature kiln is connected to the lower ends of the air electric heater, hot air thermal storage furnace A, and hot air thermal storage furnace B via pipes. The upper end of the air electric heater is connected to the upper ends of the hot air thermal storage furnace A, hot air thermal storage furnace B, hot air thermal storage furnace C, and the waste heat boiler via pipes. The high-temperature steam generated by the waste heat boiler drives a steam turbine to generate electricity, while the surplus wind and solar power are used to power the air electric heater. This technical solution effectively utilizes the medium-temperature flue gas generated by the high-temperature kiln for energy storage and conversion, increasing the temperature of the medium-temperature flue gas and thus improving the efficiency of converting the heat from the medium-temperature flue gas into electrical energy. Furthermore, it fully utilizes surplus wind and solar power energy.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, specifically to a superimposed energy storage device that utilizes waste heat and surplus electrical energy. Background Technology

[0002] High-temperature kilns in industries such as cement and steel emit large amounts of medium-temperature flue gas at temperatures around 200-400℃. This hot flue gas is currently commonly used in waste heat boilers to generate steam for power generation. However, due to the relatively low temperature of the flue gas, the thermoelectric conversion efficiency of steam turbine power generation is very low, with an efficiency of only about 10% in converting the heat energy of the flue gas into electrical energy. This is because the waste heat from the flue gas and the condensate heating system of the steam turbine lose the vast majority of the heat.

[0003] Thermoelectric power generation using high-temperature heat storage (approximately 700℃) has almost no heat loss during the heat storage process. Since there is no flue gas loss during power generation from the stored high-temperature heat, the thermoelectric conversion efficiency is around 40%, far lower than the approximately 90% of batteries and the 75-80% of pumped hydro storage.

[0004] By connecting and superimposing the heat from the above two sources into a waste heat boiler to generate steam for power generation, an overall thermoelectric conversion efficiency of about 40% can be achieved. This is equivalent to increasing the power generation efficiency of electricity-to-heat storage using waste heat from cement to about 80%, which is comparable to pumped storage.

[0005] Currently, for every ton of clinker produced, a cement kiln generates approximately 300 kWh of waste heat from flue gas at around 350°C, which can be used for power generation. In the cement industry alone, the waste heat from high-temperature kilns reaches approximately 300 billion kWh annually. Therefore, combined with the approximately 300 billion kWh of surplus wind and solar power, this could generate around 240 billion kWh during periods of power shortage. This could support the development of approximately 1.5 trillion kWh / year of wind and solar power, equivalent to the annual electricity generated by 500 million kilowatts of wind power or 1.2 billion kilowatts of photovoltaic power. Utility Model Content

[0006] Therefore, this utility model provides a superimposed energy storage device utilizing waste heat and surplus electrical energy to solve the aforementioned problems in the prior art. To achieve the above objective, this utility model provides the following technical solution: According to a first aspect of this utility model, a superimposed energy storage device utilizing waste heat and surplus electrical energy includes a high-temperature kiln and air electric heaters, hot air thermal storage furnace A, hot air thermal storage furnace B, hot air thermal storage furnace C, and a waste heat boiler arranged sequentially side-by-side beside the high-temperature kiln; wherein the high-temperature kiln is connected to the lower ends of the air electric heaters, hot air thermal storage furnace A, and hot air thermal storage furnace B via pipes, and the upper ends of the air electric heaters are connected to the upper ends of the hot air thermal storage furnaces A, B, and C, and the waste heat boiler via pipes; the high-temperature steam generated by the waste heat boiler is used to drive a steam turbine to generate electricity, and the surplus wind and solar power are used to drive the air electric heaters.

[0007] Furthermore, when there is no surplus wind and solar power but the power grid is not short, the waste heat of the medium-temperature flue gas emitted from the high-temperature kiln is stored in the refractory bricks in the hot air thermal storage furnace B. The cooled low-temperature flue gas is discharged into the air, and the air electric heater, hot air thermal storage furnace A, hot air thermal storage furnace C, waste heat boiler, steam turbine and generator are all not working.

[0008] Furthermore, when there is surplus wind and solar power, the medium-temperature flue gas emitted from the high-temperature kiln is heated to above 600°C using surplus wind and solar power and stored in the refractory bricks in the hot air storage furnace C. The cooled low-temperature flue gas is then discharged into the air. The low-temperature waste heat stored in the refractory bricks in the hot air storage furnace A and hot air storage furnace B is heated by the surplus wind and solar power through circulating air. The air electric heater is working, while the waste heat boiler, steam turbine, and generator are not working.

[0009] Furthermore, during power shortages, the waste heat boiler is connected to the bottom of hot air storage furnaces B and C via pipes. The waste heat from the medium-temperature flue gas emitted from the high-temperature kiln is transferred to the refractory bricks in hot air storage furnace A. The exhaust air carries the high-temperature heat from hot air storage furnace A to the waste heat boiler. The high-temperature heat stored in the refractory bricks of hot air storage furnaces B and C is carried out by high-temperature hot air and transferred to the waste heat boiler. The low-temperature hot air from the waste heat boiler is then input into hot air storage furnaces B and C. This cycle continues, and the waste heat boiler discharges excess low-temperature air. The air electric heater does not operate.

[0010] Furthermore, during power shortages, the waste heat boiler is connected to the bottom of hot air storage furnaces B and C via pipelines. The waste heat from the medium-temperature flue gas emitted from the high-temperature kiln is transferred to the refractory bricks in hot air storage furnace A. The exhaust air carries the high-temperature heat from hot air storage furnace A to the waste heat boiler. The high-temperature heat stored in the refractory bricks of hot air storage furnaces B and C is carried out by high-temperature hot air and transferred to the waste heat boiler. The low-temperature hot air from the waste heat boiler is then input into hot air storage furnaces B and C. This cycle continues. The waste heat boiler discharges excess low-temperature air. The air electric heater does not work. The high-temperature steam generated by the waste heat boiler drives a steam turbine to generate electricity.

[0011] Furthermore, the heat storage material in hot air heat storage furnace A, hot air heat storage furnace B, and hot air heat storage furnace C is any one of refractory bricks, non-metallic materials, or metallic materials.

[0012] This utility model has the following advantages: Through the superposition of waste heat and surplus electrical energy storage device of this utility model, the medium-temperature flue gas generated by the high-temperature kiln is effectively used for energy storage and conversion, the temperature of the medium-temperature flue gas is increased, thus improving the efficiency of converting the heat of the medium-temperature flue gas into electrical energy. In addition, the surplus wind and solar energy is fully utilized. Attached Figure Description

[0013] Figure 1 This is a structural diagram of a superimposed energy storage device that utilizes waste heat and surplus electrical energy, provided for some embodiments of this utility model.

[0014] Figure 2 The diagram illustrates the working process of a superimposed energy storage device utilizing waste heat and surplus electrical energy, provided for some embodiments of this utility model, when there is no surplus wind and solar power but the power grid is not short and the high-temperature kiln has waste heat.

[0015] Figure 3 The diagram illustrates the working process of a superimposed energy storage device utilizing waste heat and surplus electrical energy, provided for some embodiments of this utility model, in an environment with surplus wind and solar power and waste heat from a high-temperature kiln.

[0016] Figure 4 This diagram illustrates the working process of a superimposed energy storage device utilizing waste heat and surplus electrical energy, provided for some embodiments of the present invention, during a power shortage and when a high-temperature kiln generates waste heat.

[0017] In the diagram, 1 is a high-temperature kiln, 2 is an electric air heater, 3 is a hot air storage furnace A, 4 is a hot air storage furnace B, 5 is a hot air storage furnace C, 6 is a waste heat boiler, 7 is a steam turbine, 8 is a generator, and 9 is a Fuyu wind and solar power plant. Detailed Implementation

[0018] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Example 1

[0020] like Figure 1 As shown, a superimposed energy storage device utilizing waste heat and surplus electrical energy in the first aspect embodiment of this utility model includes a high-temperature kiln 1 and air electric heater 2, hot air thermal storage furnace A3, hot air thermal storage furnace B4, hot air thermal storage furnace C5, and waste heat boiler 6 arranged side by side next to the high-temperature kiln 1; wherein, the high-temperature kiln 1 is connected to the lower ends of the air electric heater 2, hot air thermal storage furnace A3, and hot air thermal storage furnace B4 through pipes respectively, and the upper end of the air electric heater 2 is connected to the upper ends of the hot air thermal storage furnace A3, hot air thermal storage furnace B4, hot air thermal storage furnace C5, and waste heat boiler 6 through pipes respectively, and the high-temperature steam generated by the waste heat boiler 6 is used to drive the steam turbine 7 to drive the generator 8 to generate electricity, and the surplus wind and solar power 9 is used to drive the air electric heater 2 to work.

[0021] In the above embodiments, it should be noted that, during use, the high-temperature hot air output from the hot air storage furnace heats the water in the waste heat boiler 6 to generate high-temperature steam. The high-temperature steam drives the steam turbine 7 to drive the generator 8 to generate electricity. The cooling water condenses the exhaust steam of the condensing steam turbine, and the condensate is circulated back to the boiler to be heated to generate high-temperature steam. The cooling water is cooled in the cooling tower. If there is a demand for low-temperature heat, the steam generated can be used to supply steam, or the hot water after heat exchange can be used for heating.

[0022] The technical effects achieved by the above embodiments are as follows: Through the superimposed energy storage device that utilizes waste heat and surplus electrical energy in this embodiment, the medium-temperature flue gas generated by the high-temperature kiln is effectively utilized for energy storage and conversion, thereby increasing the temperature of the medium-temperature flue gas and thus improving the efficiency of converting the heat of the medium-temperature flue gas into electrical energy. In addition, the surplus wind and solar energy is fully utilized.

[0023] Example 2

[0024] like Figure 2 As shown, a superimposed energy storage device utilizing waste heat and surplus electrical energy includes all the contents of Example 1. In addition, when there is no surplus wind and solar power 9 but the power grid is not short, the waste heat of the medium-temperature flue gas emitted from the high-temperature kiln 1 is stored in the refractory bricks in the hot air thermal storage furnace B4. The cooled low-temperature flue gas is discharged into the air. The air electric heater 2, hot air thermal storage furnace A3, hot air thermal storage furnace C5, waste heat boiler 6, steam turbine 7 and generator 8 are all not working.

[0025] Example 3

[0026] like Figure 3 As shown, a superimposed energy storage device utilizing waste heat and surplus electrical energy includes all the contents of Example 1. In addition, when there is surplus wind and solar power 9, the medium-temperature flue gas emitted from the high-temperature kiln 1 is heated to above 600°C by the surplus wind and solar power 9 and stored in the refractory bricks in the hot air thermal storage furnace C5. The cooled low-temperature flue gas is discharged into the air. The low-temperature waste heat stored in the refractory bricks in the hot air thermal storage furnace A3 and the hot air thermal storage furnace B4 is heated by the surplus wind and solar power 9 through circulating air. The air electric heater 2 is working, while the waste heat boiler 6, steam turbine 7 and generator 8 are not working.

[0027] Example 4

[0028] like Figure 4As shown, a superimposed energy storage device utilizing waste heat and surplus electrical energy includes all the contents of Embodiment 3. In addition, during power shortages, the waste heat boiler 6 is connected to the bottom of the hot air storage furnace B4 and the hot air storage furnace C5 through pipes. The waste heat of the medium-temperature flue gas emitted from the high-temperature kiln 1 is transported to the refractory bricks in the hot air storage furnace A3. The exhaust air carries the high-temperature heat from the hot air storage furnace A3 to the waste heat boiler 6. The high-temperature heat stored in the refractory bricks in the hot air storage furnaces B4 and C5 is carried out by high-temperature hot air and transported to the waste heat boiler 6. The low-temperature hot air from the waste heat boiler 6 is then input into the hot air storage furnaces B4 and C5. This cycle continues. The waste heat boiler 6 discharges excess low-temperature air. The air electric heater 2 does not work. The high-temperature steam generated by the waste heat boiler 6 drives the steam turbine 7 to drive the generator 8 to generate electricity.

[0029] Example 5

[0030] like Figures 1 to 4 As shown, a superimposed energy storage device utilizing waste heat and surplus electrical energy includes all the contents of Example 4. In addition, the heat storage material in the hot air heat storage furnace A3, hot air heat storage furnace B4, and hot air heat storage furnace C5 is any one of refractory bricks, non-metallic materials, or metallic materials.

[0031] In the description of this utility model, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0036] In the description of this specification, the references to terms such as "Embodiment 1," "Embodiment 2," "Example," "Specific Example," or "Some Examples," etc., indicate that the specific method, apparatus, or feature described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, methods, apparatus, or features described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A superimposed energy storage device utilizing waste heat and surplus electrical energy, characterized in that, It includes a high-temperature kiln (1) and air electric heater (2), hot air heat storage furnace A (3), hot air heat storage furnace B (4), hot air heat storage furnace C (5) and waste heat boiler (6) arranged side by side next to the high-temperature kiln (1); wherein, the high-temperature kiln (1) is connected to the lower end of the air electric heater (2), hot air heat storage furnace A (3) and hot air heat storage furnace B (4) through pipes respectively, and the upper end of the air electric heater (2) is connected to the upper end of the hot air heat storage furnace A (3), hot air heat storage furnace B (4), hot air heat storage furnace C (5) and waste heat boiler (6) through pipes respectively, and the high-temperature steam generated by the waste heat boiler (6) is used to drive the steam turbine (7) to drive the generator (8) to generate electricity, and the abundant wind and solar power (9) is used to drive the air electric heater (2) to work.

2. The energy storage device utilizing waste heat and surplus electrical energy as described in claim 1, characterized in that, When there is no surplus wind and solar power (9) but the power grid is not short, the waste heat of the medium-temperature flue gas emitted by the high-temperature kiln (1) is stored in the refractory bricks in the hot air heat storage furnace B (4). The low-temperature flue gas after cooling is discharged into the air. The air electric heater (2), hot air heat storage furnace A (3), hot air heat storage furnace C (5), waste heat boiler (6), steam turbine (7) and generator (8) are all not working.

3. The superimposed energy storage device utilizing waste heat and surplus electrical energy according to claim 1, characterized in that, When there is a surplus wind and solar power (9), the medium-temperature flue gas emitted from the high-temperature kiln (1) is heated to above 600°C by the surplus wind and solar power (9) and stored in the refractory bricks in the hot air heat storage furnace C (5). The low-temperature flue gas after cooling is discharged into the air. The low-temperature waste heat stored in the refractory bricks in the hot air heat storage furnace A (3) and the hot air heat storage furnace B (4) is heated by the surplus wind and solar power (9) through the circulating air. The air electric heater (2) is working, and the waste heat boiler (6), steam turbine (7) and generator (8) are not working.

4. The superimposed energy storage device utilizing waste heat and surplus electrical energy according to claim 1, characterized in that, When there is a power shortage, the waste heat boiler (6) is connected to the bottom of the hot air storage furnace B (4) and the hot air storage furnace C (5) through pipes. The waste heat of the medium-temperature flue gas emitted from the high-temperature kiln (1) is transported to the refractory bricks in the hot air storage furnace A (3). The exhaust air carries out the high-temperature heat in the hot air storage furnace A (3) and sends it to the waste heat boiler (6). The high-temperature heat stored in the refractory bricks in the hot air storage furnace B (4) and the hot air storage furnace C (5) is carried out by the high-temperature hot air and transported to the waste heat boiler (6). The low-temperature hot air from the waste heat boiler (6) is then input into the hot air storage furnace B (4) and the hot air storage furnace C (5). This cycle continues. The waste heat boiler (6) discharges excess low-temperature air. The air electric heater (2) does not work. The high-temperature steam generated by the waste heat boiler (6) drives the steam turbine (7) to drive the generator (8) to generate electricity.

5. The superimposed energy storage device utilizing waste heat and surplus electrical energy according to claim 1, characterized in that, The heat storage material in hot air heat storage furnace A (3), hot air heat storage furnace B (4), and hot air heat storage furnace C (5) is any one of refractory bricks, non-metallic materials, or metallic materials.

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