Heat storage and release system
By using heat storage and discharge devices and lithium bromide refrigeration units in the heat storage and discharge system of the steam turbine unit, the waste of steam and electricity during deep peak shaving is solved, efficient storage and reuse of heat is achieved, resource utilization is improved and resource utilization is reduced energy consumption.
Patent Information
- Application Number
- CN202310842347.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-10
- Publication Date
- 2025-01-10
AI Technical Summary
During deep peak-shaving operation, the insufficient extraction pressure of the high-pressure cylinder of the turbine unit leads to the inability to utilize high-temperature steam, and the excess electrical energy cannot be effectively utilized when the load is too low, resulting in waste of resources and increased energy consumption.
Design a heat storage and venting system, including a steam turbine unit, a heat storage and venting device and lithium bromide refrigeration unit, by scattered graphite and liquefied asphalt as Thermal conductor and heat storage and exothermic materials realize the storage and reuse of heat.
It improves resource utilization, reduces energy consumption, saves energy, and reduces overall energy consumption by recovering waste heat at low loads and utilizing stored heat when loads are high.
Smart Images
Figure CN119289742A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of heat storage and release, and in particular, to a heat storage and release system. Background Art
[0002] Deep peak regulation is a mode of operation in which the output of thermal power plants decreases due to the large difference between peak and valley loads of the power grid, and the generator sets exceed the basic peak regulation range for peak regulation. At present, when the units are operating under deep peak regulation conditions, due to insufficient extraction pressure of the high-pressure cylinder of the steam turbine unit, some high-temperature steam cannot be used; and when the load of the steam turbine unit is too low, its excess electric energy cannot be effectively used, resulting in a waste of steam heat and electric energy resources, and increasing the energy consumption of the steam turbine unit. Summary of the invention
[0003] The purpose of the present disclosure is to provide a heat storage and release system, which can fully utilize the excess steam and electricity when the load of the steam turbine unit is low, thereby improving the utilization rate of resources, reducing energy consumption, and saving energy.
[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a heat storage and release system, comprising: a steam turbine unit; and a heat storage and release device, comprising a shell and a heat storage and release material, a heat exchanger and an electric heating component arranged in the shell, wherein a first connecting port of the heat exchanger is connected to the steam turbine unit through a first pipeline, and the electric heating component is electrically connected to the steam turbine unit; wherein, when the load rate of the steam turbine unit is lower than a first preset value, at least part of the steam flowing into the steam turbine unit enters the heat exchanger and releases heat to the heat storage and release material; when the load rate of the steam turbine unit is lower than a second preset value, the electric energy generated by the steam turbine unit is at least partially heated by the electric heating component to heat the heat storage and release material.
[0005] Optionally, the heat storage and release system also includes a lithium bromide refrigeration unit, which is connected to the first pipeline through a second pipeline. When the load rate of the steam turbine unit is lower than the first preset value, at least part of the steam flowing into the steam turbine unit flows into the lithium bromide refrigeration unit via the first pipeline and the second pipeline in sequence.
[0006] Optionally, the second connecting port of the heat exchanger is connected to a water tank; when the load rate of the steam turbine unit is lower than the first preset value, the steam flowing through the heat exchanger releases heat and condenses and then flows into the water tank; when the load rate of the steam turbine unit is higher than a third preset value, the water in the water tank flows into the heat exchanger to absorb the heat of the heat storage material and evaporate, and the evaporated steam flows through the first pipeline and the second pipeline in sequence and flows into the lithium bromide refrigeration unit.
[0007] Optionally, the lithium bromide refrigeration unit is connected to the water tank through a third pipeline, and is connected to the exhaust pipe of the steam turbine unit through a fourth pipeline, so that water from the water tank enters the exhaust pipe after being cooled by the lithium bromide refrigeration unit.
[0008] Optionally, the heat storage and release system further includes an air cooling island for cooling the steam flowing through the exhaust pipe, the water tank is connected to the exhaust pipe through a return pipe, and the connection point between the return pipe and the exhaust pipe is located downstream of the air cooling island.
[0009] Optionally, the electric heating assembly includes a heating unit and a heat conductor, wherein the heating unit is located at one side of the heat exchanger and can be used to heat the heat conductor, so that the heat conductor can transfer heat to the heat storage and release material.
[0010] Optionally, the heating unit is configured as an induction heating coil, the area enclosed by the induction heating coil forms a heating area, and the heat conductor is at least partially disposed through the heating area.
[0011] Optionally, the heat conductor is in contact with the heat storage and release material.
[0012] Optionally, the heat conductor and the heat storage and release material both include flake graphite and liquefied asphalt, and the weight ratio of the flake graphite to the liquefied asphalt is 70-80:30-20.
[0013] Optionally, the heat exchanger comprises a plurality of heat exchange tubes arranged side by side, and an angle between an extension direction of the heat exchange tubes and a horizontal plane is 15° to 30°.
[0014] Through the above technical scheme, the heat storage and release system disclosed in the present invention will be in a heat storage state when the load of the steam turbine unit is lower than the first preset value. At this time, it can transport excess steam from the steam turbine unit to the heat exchanger and release heat to the heat storage and release material, thereby storing the heat in the heat storage and release material to achieve high-temperature waste heat recovery; and when the load of the steam turbine unit is lower than the second preset value, the electric heating component will use the excess electric energy of the steam turbine unit to heat the heat storage material, thereby improving resource utilization and reducing energy consumption.
[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0017] Figure 1 is a schematic diagram of a heat storage and release system provided in an embodiment of the present disclosure;
[0018] Figure 2 It is a schematic diagram of the structure of the heat storage and release device in the heat storage and release system provided in an embodiment of the present disclosure.
[0019] Description of Reference Numerals
[0020] 1-steam turbine unit; 2-heat storage and release device; 201-shell; 202-heat storage and release material; 203-heat exchanger; 204-electric heating component; 205-first connecting port; 206-heating unit; 207-heat conductor; 208-second connecting port; 3-first pipeline; 4-lithium bromide refrigeration unit; 5-second pipeline; 6-water tank; 7-third pipeline; 8-fourth pipeline; 9-exhaust pipe; 10-air cooling island; 11-reflux pipe. DETAILED DESCRIPTION
[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0022] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to "inside" and "outside" relative to the corresponding component's own contour. In addition, the terms "first", "second", "third", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.
[0023] In order to achieve the above purpose, Figure 1-Figure 2 As shown, the present disclosure provides a heat storage and release system, including a steam turbine unit 1 and a heat storage and release device 2; wherein the heat storage and release device 2 includes a shell 201 and a heat storage and release material 202, a heat exchanger 203 and an electric heating component 204 arranged in the shell 201, a first connecting port 205 of the heat exchanger 203 is connected to the steam turbine unit 1 through a first pipeline 3, and the electric heating component 204 is electrically connected to the steam turbine unit 1; when the load rate of the steam turbine unit 1 is lower than the first preset value, the heat storage and release system is in a heat storage state, at which time the heat flowing into the steam turbine unit 1 to A small amount of steam will enter the heat exchanger 203 and release heat to the heat storage material 202, and the heat storage material 202 will absorb and store the heat for subsequent use, thereby achieving the effect of waste heat recovery and improving resource utilization. When the load rate of the steam turbine unit 1 is lower than the second preset value, the electric energy generated by the steam turbine unit 1 is at least partially heated by the electric heating component 204 to heat the heat storage material 202, so that the excess electricity can be converted into thermal energy for subsequent use by the steam turbine unit 1, thereby further reducing energy consumption and saving costs.
[0024] Among them, the first preset value can be 30%, and the second preset value can be 25%, 20% or a lower value. According to different steam turbine units 1, the staff can set the preset value adapted to the steam turbine unit 1 itself as needed. Generally, the first preset value is 30%, and the second preset value is between 17% and 30%. The present disclosure does not limit this.
[0025] In an embodiment of the present disclosure, the heat storage and release system further includes a lithium bromide refrigeration unit 4, which is connected to the first pipeline 3 through the second pipeline 5. When the load rate of the steam turbine unit 1 is lower than the first preset value, at least part of the steam flowing into the steam turbine unit 1 flows into the lithium bromide refrigeration unit 4 via the first pipeline 3 and the second pipeline 5 in sequence. When the heat storage and release system is in a heat storage state, a part of the steam will be transmitted to the heat storage and release device 2, so that the heat storage and release material 202 can store heat, and another part of the steam will be passed into the lithium bromide refrigeration unit 4 to drive the lithium bromide refrigeration unit 4 to work, thereby preparing low-temperature liquid water.
[0026] In some other embodiments of the present disclosure, the second connecting port 208 of the heat exchanger 203 is connected to the water tank 6; the water tank 6 can store condensed water formed after the steam flowing through the heat exchanger 203 releases heat and condenses when the load rate of the steam turbine unit 1 is lower than the first preset value; in addition, the first connecting port 205 can be positioned above the second connecting port 208 to facilitate the steam to enter and exit the first connecting port 205 and the condensed water to be discharged from the second connecting port 208.
[0027] When the load rate of the steam turbine unit 1 is higher than the third preset value, the load of the steam turbine unit 1 is high, and the heat storage and release system is switched from the heat storage state to the heat release state. The water in the water tank 6 can flow into the heat exchanger 203 to absorb the heat of the heat storage and release material 202 and evaporate. The evaporated steam flows through the first pipeline 3 and the second pipeline 5 in turn and flows into the lithium bromide refrigeration unit 4, thereby driving the lithium bromide refrigeration unit 4 to produce more low-temperature liquid water. In addition, a one-way valve can also be provided on the first pipeline 3 and the second pipeline 5 to prevent the evaporated steam from returning to the steam turbine unit 1, wherein the third preset value can be 90%.
[0028] In order to ensure that the quality of the water in the water tank 6 meets the use standards, the water tank 6 can also be connected to a desalted water system.
[0029] In the embodiment of the present disclosure, the lithium bromide refrigeration unit 4 is connected to the water tank 6 through the third pipeline 7, and the lithium bromide refrigeration unit 4 is also connected to the exhaust pipe 9 of the steam turbine unit 1 through the fourth pipeline 8, so that the water from the water tank 6 enters the exhaust pipe 9 after being cooled by the lithium bromide refrigeration unit 4. In this way, the low-temperature liquid water formed by the lithium bromide refrigeration unit 4 can cool the steam discharged through the steam turbine unit 1, so as to reduce the load of other equipment that cools the steam.
[0030] For example, the heat storage and release system also includes an air-cooling island 10 for cooling the steam flowing through the exhaust pipe 9. The water tank 6 is connected to the exhaust pipe 9 through a return pipe 11, and the connection point between the return pipe 11 and the exhaust pipe 9 is located downstream of the air-cooling island 10. When the load of the steam turbine unit 1 is high, the load of the air-cooling island 10 for cooling the steam discharged from the steam turbine unit 1 is also high. Therefore, when the air-cooling island 10 cools the discharged steam, the cooling water formed by the lithium bromide refrigeration unit 4 will also enter the exhaust pipe 9 to cool the steam. Under the action of the low-temperature cooling water, the load of the air-cooling island 10 can be reduced, and the energy consumption can be reduced. The condensed water formed after the high-temperature steam is condensed will flow back to the water tank 6 through the return pipe 11, or be discharged into the condensed water system, thereby completing the collection of the condensed water.
[0031] In the embodiments of the present disclosure, Figure 2 As shown, the electric heating component 204 includes a heating unit 206 and a heat conductor 207. The heating unit 206 can heat the heat conductor 207. In order to prevent the heat of the heating unit 206 from being too high and damaging the heat exchanger 203, the heating unit 206 is located on one side of the heat exchanger 203. The heated heat conductor 207 can transfer heat to the heat storage and release material 202 to ensure that the heat storage and release system can fully utilize the excess electric energy of the steam turbine unit 1 and reduce energy waste.
[0032] Among them, the heating unit 206 can be configured as an induction heating coil, the area enclosed by the induction heating coil forms a heating area, and the heat conductor 207 is at least partially arranged in the heating area. When the load of the steam turbine unit 1 is lower than the second preset value, its excess electric energy will act on the induction heating coil, thereby heating the heat conductor 207 located in the heating area.
[0033] Alternatively, in some embodiments not shown, the heating unit 206 may also be other structures that utilize electrical energy to heat the heat conductor 207, such as an electric heating wire or an electric heating tube.
[0034] In the embodiment of the present disclosure, in order to ensure the heat transfer efficiency between the heat conductor 207 and the heat storage material 202, the heat conductor 207 is fitted with the heat storage material 202, and heat is transferred by contact between solids, which has higher heat transfer efficiency and more stable heat transfer effect. For example, the heat storage material 202 can be buried in the gaps between the various pipes of the heat exchanger 203 and the gaps between the heat exchanger 203 and the shell 201 in the form of granules or powders. The heat conductor 207 can be constructed as a rod-shaped structure, one end of which is inserted into the heating area and heated by the heating unit 206, and the other end is inserted into the heat storage material 202 to transfer the heat stored in the heating area to the heat storage material 202.
[0035] In addition, the heat conductor 207 and the heat storage material 202 may both include flake graphite and liquefied asphalt, wherein the weight ratio of flake graphite to liquefied asphalt may be 70-80:30-20. Compared with molten salt as a heat storage device, the use of flake graphite and liquefied asphalt as the heat conductor 207 and the heat storage material 202 has a higher thermal conductivity.
[0036] In order to enable the steam of the steam turbine unit 1 to fully contact the heat exchanger 203, the heat exchanger 203 includes a plurality of heat exchange tubes arranged side by side, and the angle between the extension direction of the heat exchange tubes and the horizontal plane is 15° to 30°. The specific angle can be determined according to the flow rate of the steam. For example, when the flow rate of the steam is small, the angle can be larger. On the contrary, when the flow rate is large, the angle can be smaller, so that the steam from the steam turbine unit 1 or the water from the water tank 6 can fully exchange heat with the heat storage material 202 through the heat exchange tube, thereby improving the heat exchange efficiency. Among them, the plurality of heat exchange tubes can be arranged in series, the port located at the top can be connected to the first connecting port 205, and the port located at the bottom can be connected to the second connecting port 208; or, the plurality of connecting tubes can also be arranged in parallel, the common port located at the top can be connected to the first connecting port 205, and the common port located at the bottom can be connected to the second connecting port 208.
[0037] In summary, the operating status of the present disclosure can be exemplarily shown in the following table:
[0038]
[0039] Its specific working principle is: when the load of the steam turbine unit 1 is lower than the first preset value, the heat storage and release system is in a heat storage state, that is, operating condition 2, a part of the steam of the steam turbine unit 1 will enter the lithium bromide refrigeration unit 4 through the second pipeline 5, drive it to work to form low-temperature liquid water, and another part of the steam will enter the heat exchanger 203 through the first pipeline 3 and release heat to the heat storage and release material 202, and the heat storage and release material 202 formed by flake graphite and liquefied asphalt will absorb heat and preserve it, thereby completing the waste heat recovery work; if the load of the steam turbine unit 1 is further reduced, the electric heating component 204 can be activated by the excess electric energy of the steam turbine unit 1. At this time, the heat storage and release system is still in a heat storage state, that is, operating condition 3, and the induction heating coil will heat the heat conductor 207 so that the heat conductor 2 07 transfers heat to the heating unit 206 to make full use of resources; when the steam turbine unit 1 is in peak period and needs to increase the load, the heat storage and release system can be switched to the heat release state, that is, operating condition 1. At this time, the water in the water tank 6 will enter the heat exchanger 203 through the second connecting port 208, and evaporate under the action of the heat released by the heat storage and release material 202. The evaporated steam enters the lithium bromide refrigeration unit 4 through the first pipeline 3 and the second pipeline 5 in turn to drive the lithium bromide refrigeration unit 4 to work. The low-temperature cooling water formed by the lithium bromide refrigeration unit 4 will then enter the exhaust pipe 9 through the fourth pipeline 8, so that the low-temperature cooling water and the air-cooling island 10 can cool down the high-temperature steam discharged from the steam turbine unit 1, thereby reducing the load of the air-cooling island 10 and reducing resource consumption.
[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0042] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A heat storage and release system, characterized in that: include: Steam turbine unit; and The heat storage and release device comprises a shell and a heat storage and release material, a heat exchanger and an electric heating component arranged in the shell, wherein the first communication port of the heat exchanger is connected to the steam turbine unit through a first pipeline, and the electric heating component is electrically connected to the steam turbine unit; Wherein, when the load rate of the steam turbine unit is lower than a first preset value, at least part of the steam flowing into the steam turbine unit enters the heat exchanger and releases heat to the heat storage material; When the load rate of the steam turbine unit is lower than a second preset value, the electric energy generated by the steam turbine unit is at least partially used to heat the heat storage material through the electric heating component.
2. The heat storage and release system according to claim 1, characterized in that: The heat storage and release system further includes a lithium bromide refrigeration unit, and the lithium bromide refrigeration unit is connected to the first pipeline through a second pipeline; When the load rate of the steam turbine unit is lower than the first preset value, at least part of the steam flowing into the steam turbine unit flows into the lithium bromide refrigeration unit via the first pipeline and the second pipeline in sequence.
3. The heat storage and release system according to claim 2, characterized in that: The second communication port of the heat exchanger is connected to the water tank; When the load rate of the steam turbine unit is lower than the first preset value, the steam flowing through the heat exchanger releases heat and condenses before flowing into the water tank; When the load rate of the steam turbine unit is higher than the third preset value, the water in the water tank flows into the heat exchanger to absorb the heat of the heat storage material and evaporate, and the evaporated steam flows through the first pipeline and the second pipeline in sequence and flows into the lithium bromide refrigeration unit.
4. The heat storage and release system according to claim 3, characterized in that: The lithium bromide refrigeration unit is connected to the water tank through a third pipeline, and is connected to the exhaust pipe of the steam turbine unit through a fourth pipeline, so that water from the water tank enters the exhaust pipe after being cooled by the lithium bromide refrigeration unit.
5. The heat storage and release system according to claim 4, characterized in that: The heat storage and release system also includes an air cooling island for cooling the steam flowing through the exhaust pipe. The water tank is connected to the exhaust pipe through a return pipe, and the connection point between the return pipe and the exhaust pipe is located downstream of the air cooling island.
6. The heat storage and release system according to claim 1, characterized in that: The electric heating assembly includes a heating unit and a heat conductor. The heating unit is located at one side of the heat exchanger and can be used to heat the heat conductor, so that the heat conductor can transfer heat to the heat storage material.
7. The heat storage and release system according to claim 6, characterized in that: The heating unit is configured as an induction heating coil, the area enclosed by the induction heating coil forms a heating area, and the heat conductor is at least partially disposed through the heating area.
8. The heat storage and release system according to claim 6, characterized in that: The heat conductor is in contact with the heat storage and release material.
9. The heat storage and release system according to claim 6, characterized in that: The heat conductor and the heat storage and release material both include flake graphite and liquefied asphalt, and the weight ratio of the flake graphite to the liquefied asphalt is 70-80:30-20.
10. The heat storage and release system according to claim 1, characterized in that: The heat exchanger comprises a plurality of heat exchange tubes arranged side by side, and the angle between the extending direction of the heat exchange tubes and the horizontal plane is 15° to 30°.