Valley electricity heat storage high-temperature heat pump steam system

Abstract

The utility model relates to the technical field of steam generation, in particular to an off-peak electricity heat storage high-temperature heat pump steam system which comprises an off-peak electricity heat storage boiler, a high-temperature heat pump unit, a flash evaporator and an ejector. Specifically, the off-peak electricity heat storage boiler has a heat preservation function, and a heater is arranged in the off-peak electricity heat storage boiler; the high-temperature heat pump unit comprises an evaporator, a compressor, a condenser and a first throttling valve, and the evaporator, the compressor, the condenser and the first throttling valve form a first loop through a pipeline; the flash evaporator and the condenser form a second loop through a pipeline, and the flash evaporator exchanges heat with the high-temperature heat pump unit through the condenser; and the ejector is respectively communicated with the off-peak electricity heat storage boiler and a steam outlet of the flash evaporator through pipelines. According to the utility model, off-peak electricity and industrial waste heat can be used for generating industrial steam, so that the production cost of the steam is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steam generation technology, and in particular to a high-temperature heat pump steam system for off-peak electricity storage. Background Technology

[0002] Steam, as an important heat transfer medium, is widely used in industrial production processes. The primary steam-generating equipment is the boiler, including coal-fired boilers, gas-fired boilers, and electric boilers. Coal-fired boilers are the main source of steam due to their low operating costs. Gas-fired, oil-fired, and electric boilers, however, have higher operating costs, increasing the steam costs for businesses. Reducing pollutant emissions during industrial steam production while simultaneously lowering steam production costs is a crucial issue currently facing industrial steam production. Heat pumps, as energy-saving and environmentally friendly power supply devices, can fully utilize low-temperature heat sources to generate steam with minimal electricity consumption, representing a significant trend in steam production. Currently, due to factors such as the working fluid and components, the steam temperature generated by heat pumps is relatively low, typically below 120°C, limiting the industrial applications they can meet. To generate higher-temperature steam through heat pumps, a steam compressor is usually added after the heat pump generates steam. However, current steam compressors are expensive, hindering widespread adoption. On the other hand, utilizing peak-valley electricity pricing can effectively reduce steam production costs. During periods of low electricity prices, the thermal storage boiler generates steam or high-temperature, high-pressure hot water using off-peak electricity. A portion of the high-temperature, high-pressure water and steam is stored in the thermal storage boiler, while the remainder is used for ejection via an ejector. During periods of peak electricity prices, the thermal storage boiler stops heating. A high-temperature heat pump then generates low-pressure steam, which is then pressurized using the high-temperature, high-pressure steam stored in the thermal storage boiler, thereby providing steam to meet user needs and reducing steam production costs. Utility Model Content

[0003] To address at least one deficiency in the existing technology, this utility model provides a high-temperature heat pump steam system with off-peak electricity storage, which can generate industrial steam using off-peak electricity and industrial waste heat, thereby reducing the production cost of steam.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A high-temperature heat pump steam system for off-peak electricity storage includes:

[0006] A valley-time electricity storage boiler, which has a heat preservation function and is equipped with a heater inside the valley-time electricity storage boiler;

[0007] A high-temperature heat pump unit includes an evaporator, a compressor, a condenser, and a first throttling valve, wherein the evaporator, compressor, condenser, and first throttling valve form a first circuit through pipes;

[0008] The flash evaporator forms a second loop with the condenser through a pipe, and the flash evaporator exchanges heat with the high-temperature heat pump unit through the condenser;

[0009] The ejector is connected via pipes to the steam outlets of the off-peak electricity storage boiler and the flash evaporator, respectively.

[0010] In the above-described off-peak electricity thermal storage high-temperature heat pump steam system, the compressor is a semi-hermetic screw compressor; and the heater is a PTC heating rod.

[0011] The off-peak electricity storage high-temperature heat pump steam system described above further includes: a softened water source, which is connected to the off-peak electricity storage boiler via a pipeline, and a pressurized water pump is installed on the pipeline.

[0012] In the above-described off-peak electricity storage high-temperature heat pump steam system, the off-peak electricity storage boiler is further provided with a pressure gauge, which is used to monitor the pressure inside the off-peak electricity storage boiler.

[0013] As described above, the off-peak electricity storage high-temperature heat pump steam system further includes a pressure relief valve in the off-peak electricity storage boiler, which is used to ensure that the pressure inside the off-peak electricity storage boiler is maintained within a set safe range.

[0014] In the above-described off-peak electricity storage high-temperature heat pump steam system, a first steam flow regulating valve is further provided on the pipeline connecting the off-peak electricity storage boiler and the ejector, and a second steam flow regulating valve is provided on the pipeline connecting the flash evaporator and the ejector.

[0015] The high-temperature heat pump steam system with off-peak electricity storage, as described above, further includes a waste heat source outlet interface and a waste heat source inlet interface. The waste heat source inlet interface and the waste heat source outlet interface are connected by a pipe to form a waste heat source water pipeline. The first loop exchanges heat with the waste heat source water pipeline through the evaporator.

[0016] The high-temperature heat pump steam system for off-peak electricity storage, as described above, further includes: a water inlet interface, which is connected to the second circuit via a pipeline, and a water inlet pump is installed on the pipeline.

[0017] In the above-described high-temperature heat pump steam system for off-peak electricity storage, the second circuit is further provided with a circulating water pump and a second throttle valve.

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

[0019] 1. This utility model makes full use of off-peak electricity to provide steam to users, reducing the cost of electricity consumption and thus reducing the production cost of steam.

[0020] 2. During peak electricity prices, high-temperature heat pumps are used to recover industrial waste heat to generate steam, reducing electricity consumption.

[0021] 3. High-pressure steam stored during off-peak electricity is used to recompress low-pressure steam generated by high-temperature heat pumps, reducing investment in steam compression equipment and providing steam to meet more application scenarios. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the high-temperature heat pump steam system for off-peak electricity storage in an embodiment of this utility model.

[0024] In the attached diagram: 1. Off-peak electricity thermal storage boiler; 2. Pressure gauge; 3. PTC heating rod; 4. Pressure relief valve; 5. Compressor; 6. First steam flow regulating valve; 7. Second throttle valve; 8. Ejector; 9. Second steam flow regulating valve; 10. Flash evaporator; 11. Valve; 12. Makeup water inlet interface; 13. Makeup water pump; 14. Circulating water pump; 15. Condenser; 16. First throttle valve; 17. Waste heat source outlet interface; 18. Evaporator; 19. Waste heat source inlet interface; 20. Softened water source; 21. Pressurized water pump. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] Example:

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, in the embodiments of this utility model are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0028] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] See Figure 1 This embodiment provides a high-temperature heat pump steam system for off-peak electricity storage, including: an off-peak electricity storage boiler 1, a high-temperature heat pump unit, a flash evaporator 10, and an ejector 8. Specifically, the off-peak electricity storage boiler 1 has a heat preservation function and is equipped with a heater; the high-temperature heat pump unit includes an evaporator 18, a compressor 5, a condenser 15, and a first throttling valve 16. The evaporator 18, compressor 5, condenser 15, and first throttling valve 16 form a first loop through a pipeline, and the circulating working fluid in the loop is R245fa; the flash evaporator 10 forms a second loop with the condenser 15 through a pipeline, and the flash evaporator 10 exchanges heat with the high-temperature heat pump unit through the condenser 15; the ejector 8 is connected to the steam outlets of the off-peak electricity storage boiler 1 and the flash evaporator 10 through pipelines respectively.

[0030] Furthermore, the compressor 5 is a semi-hermetic screw compressor; the heater is a PTC heating rod 3.

[0031] Furthermore, it also includes: a softened water source 20, which is connected to the off-peak electricity thermal storage boiler 1 via a pipeline, and a pressurized water pump 21 is installed on the pipeline.

[0032] Furthermore, the off-peak electricity thermal storage boiler 1 is equipped with a pressure gauge 2, which is used to monitor the pressure inside the off-peak electricity thermal storage boiler 1.

[0033] Furthermore, the off-peak electricity thermal storage boiler 1 is equipped with a pressure relief valve 4, which is used to ensure that the pressure inside the off-peak electricity thermal storage boiler 1 is maintained within a set safe range.

[0034] Furthermore, a first steam flow regulating valve 6 is installed on the pipe connecting the off-peak electric thermal storage boiler 1 and the ejector 8, and a second steam flow regulating valve 9 is installed on the pipe connecting the flash evaporator 10 and the ejector 8.

[0035] Furthermore, it also includes a waste heat source outlet interface 17 and a waste heat source inlet interface 19. The waste heat source inlet interface 19 and the waste heat source outlet interface 17 are connected by a pipe to form a waste heat source water pipeline. The first loop exchanges heat with the waste heat source water pipeline through the evaporator 18.

[0036] Furthermore, it also includes: a water inlet interface 12, which is connected to the second circuit via a pipe, and a water pump 13 is installed on the pipe.

[0037] Furthermore, the second circuit is also equipped with a circulating water pump 14 and a second throttle valve 7.

[0038] See you again Figure 1 This embodiment also provides an operation method applicable to any of the above-described off-peak electricity thermal storage high-temperature heat pump steam systems, including:

[0039] During off-peak electricity pricing periods: the heater and high-temperature heat pump unit are started. The heater uses off-peak electricity to heat the water in the off-peak electricity storage boiler, generating high-temperature and high-pressure water and steam. Part of the heated high-temperature and high-pressure water and steam is stored in the off-peak electricity storage boiler, while the other part of the high-temperature and high-pressure steam enters the low-pressure steam generated by the ejector flash evaporator through the first steam flow regulating valve, forming medium-pressure steam for users.

[0040] During peak electricity price periods: The heater is turned off while the high-temperature heat pump unit is turned on. The high-temperature heat pump unit uses peak electricity and industrial waste heat to generate heat, which heats the water that has been pressurized by the pressurized water pump in the condenser. After the water temperature rises, it enters the flash evaporator to depressurize and flash out low-pressure steam. The low-pressure steam enters the ejector and is pressurized into medium-pressure steam by the high-temperature and high-pressure steam stored from the off-peak electricity storage boiler before being supplied to users.

[0041] As a preferred example, such as Figure 1As shown, a high-temperature heat pump steam system for off-peak electricity storage includes a high-temperature heat pump unit, an off-peak electricity storage boiler 1, a flash evaporator 10, and an ejector 8. The high-temperature heat pump unit includes an evaporator 18, a compressor 5, a condenser 15, and a first throttling valve 16. The compressor 5 is a semi-hermetic screw compressor, and the heat pump circulating working fluid is R245fa. The evaporator 18 is connected to waste heat source water through a waste heat source inlet interface 19 and a waste heat source outlet interface 17. The circulating working fluid R245fa evaporates in the evaporator 18 and absorbs heat from the heat source. The off-peak electricity storage boiler 1 is a high-pressure heat storage boiler with insulation. The off-peak electricity storage boiler 1 uses off-peak electricity to drive a PTC heating rod 3 for heating. The heat storage medium is high-pressure water from a softened water source 20, pressurized by a pressurized water pump 21. The off-peak electricity storage boiler 1 is equipped with a pressure gauge 2 and a pressure relief valve 4. Flash evaporator 10 exchanges heat with condenser 15 and high-temperature heat pump. High-temperature water from condenser 15 flashes through the depressurized portion of flash evaporator 10 to form low-pressure steam. The remaining un-flashed water mixes with makeup water pressurized by makeup water pump 13 via valve 11. The mixed water is then pressurized by circulating water pump 14. This pressurized water absorbs heat from the condensation of the heat pump unit's circulating working fluid R245fa in condenser 15, becoming high-temperature, high-pressure water. After being depressurized by the second throttle valve 7, the high-temperature, high-pressure water re-enters flash evaporator 10 to produce steam again. The makeup water originates from makeup water inlet interface 12. Ejector 8 is installed between off-peak electricity storage boiler 1 and flash evaporator 10. High-temperature, high-pressure water in off-peak electricity storage boiler 1 is depressurized to form high-temperature, high-pressure steam. Ejector 8 draws low-pressure steam from flash evaporator 10, mixes it to form medium-pressure steam, and simultaneously maintains the low pressure of flash evaporator 10. The high-temperature heat pump unit adopts a high-temperature heat pump with a large temperature rise, and the high-temperature heat pump adopts a semi-hermetic screw compressor 5. A second steam flow regulating valve 9 is set between the flash evaporator 10 and the ejector 8, and a first steam flow regulating valve 6 is set between the off-peak electricity storage boiler 1 and the ejector 8.

[0042] The operation method is as follows: During off-peak electricity hours, the electric heating device and high-temperature heat pump are started to heat the water in the off-peak electricity storage boiler 1. Part of the heated high-temperature water and steam are stored in the storage boiler, while the other part enters the ejector 8 through the steam flow regulating valve to induce low-pressure steam generated by the flash evaporator 10, forming medium-pressure steam for users. During peak electricity hours, the electric heating rods are turned off and only the high-temperature heat pump is turned on to heat the water pressurized by the pressurized water pump 21 in the condenser 15. After the water temperature rises, it enters the flash evaporator 10 through the throttling valve to depressurize and flash out low-pressure steam. The low-pressure steam enters the ejector 8 and is pressurized by the high-pressure steam from the storage boiler to medium-pressure steam for users.

[0043] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] 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.

[0046] The above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the substance of the content of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A high-temperature heat pump steam system for off-peak electricity storage, characterized in that, include: A valley-time electricity storage boiler, which has a heat preservation function and is equipped with a heater inside the valley-time electricity storage boiler; A high-temperature heat pump unit includes an evaporator, a compressor, a condenser, and a first throttling valve, wherein the evaporator, compressor, condenser, and first throttling valve form a first circuit through pipes; The flash evaporator forms a second loop with the condenser through a pipe, and the flash evaporator exchanges heat with the high-temperature heat pump unit through the condenser; The ejector is connected via pipes to the steam outlets of the off-peak electricity storage boiler and the flash evaporator, respectively.

2. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, The compressor is a semi-hermetic screw compressor; the heater is a PTC heating rod.

3. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, Also includes: A softened water source is connected to the off-peak electricity thermal storage boiler via a pipeline, and a pressurized water pump is installed on the pipeline.

4. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, The off-peak electricity thermal storage boiler is equipped with a pressure gauge, which is used to monitor the pressure inside the off-peak electricity thermal storage boiler.

5. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, The off-peak electricity thermal storage boiler is equipped with a pressure relief valve, which is used to ensure that the pressure inside the off-peak electricity thermal storage boiler is maintained within a set safe range.

6. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, A first steam flow regulating valve is installed on the pipeline connecting the off-peak electric thermal storage boiler and the ejector, and a second steam flow regulating valve is installed on the pipeline connecting the flash evaporator and the ejector.

7. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, It also includes a waste heat source outlet interface and a waste heat source inlet interface. The waste heat source inlet interface and the waste heat source outlet interface are connected by a pipe to form a waste heat source water pipeline. The first loop exchanges heat with the waste heat source water pipeline through the evaporator.

8. The high-temperature heat pump steam system for off-peak electricity storage according to claim 1, characterized in that, Also includes: A water inlet interface is provided, which is connected to the second circuit via a pipeline, on which a water pump is installed.

9. The high-temperature heat pump steam system for off-peak electricity storage according to claim 8, characterized in that, The second circuit is also equipped with a circulating water pump and a second throttle valve.

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