Steam generation system coupled with waste heat recovery in zero-carbon park

Abstract

The utility model belongs to steam generation technical field, concretely relates to a steam generation method with the form of heating method as the feature, especially relates to a zero carbon park coupling waste heat recovery steam generation system. The zero carbon park coupling waste heat recovery steam generation system obtains the condensate water of refrigeration equipment in the production factory area through the low temperature heat source acquisition device set up, so as to utilize this part of condensate water with waste heat as the low temperature heat source of steam generation device, compared with directly heating low temperature water to produce steam, the condensate water with waste heat can effectively reduce the heat required for steam generation, thereby saving the steam production cost.

Description

Technical Field

[0001] This utility model belongs to the field of steam generation technology, specifically relating to a steam generation method characterized by a heating method, and more particularly to a steam generation system for zero-carbon industrial parks coupled with waste heat recovery. Background Technology

[0002] To promote the active and steady advancement of carbon peaking and carbon neutrality goals and accelerate the comprehensive green transformation of economic and social development, the construction and transformation of zero-carbon industrial parks will inevitably become a core approach for the industrial sector to achieve these goals. In traditional industrial parks, steam production mainly relies on fossil fuels, especially coal. Common coal-fired steam production technologies include suspension combustion boilers and circulating fluidized bed boilers. This not only increases heating costs, but the carbon oxides produced during combustion also pollute the environment, posing a serious obstacle to the transformation of industrial parks to zero-carbon or near-zero-carbon status.

[0003] There is an urgent need to provide a steam generation system that couples waste heat recovery to a zero-carbon industrial park, in order to solve the technical problems of increased heating costs and environmental pollution in related technologies.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0005] This disclosure provides at least one embodiment of a zero-carbon industrial park coupled with waste heat recovery steam generation system, comprising: a low-temperature heat source acquisition device and a steam generation device; the low-temperature heat source acquisition device is configured to provide a low-temperature heat source to the steam generation device; wherein the steam generation device includes: a high-temperature heat pump unit; the low-temperature heat source acquisition device is connected to the evaporator side of the high-temperature heat pump unit; and the low-temperature heat source acquisition device is configured to deliver condensate with waste heat to the evaporator as a low-temperature heat source for heat exchange of the high-temperature heat pump unit.

[0006] In one optional embodiment, the steam generating device further includes: a flash tank; the flash tank is connected to the high-temperature heat pump unit via a water pump; wherein the flash tank is configured to obtain high-temperature hot water delivered by the high-temperature heat pump unit; and the flash tank is further configured to flash-evaporate the high-temperature hot water to obtain high-temperature saturated steam.

[0007] In one alternative embodiment, the flash tank is connected to the condenser of the high-temperature heat pump unit via a return line; the return line is configured to return unflashed hot water in the flash tank to the condenser side.

[0008] In one optional embodiment, the low-temperature heat source acquisition device includes: a condensate acquisition module and an electric heating module; wherein the condensate acquisition module is configured to acquire condensate with waste heat from the refrigeration unit; and the electric heating module is configured to generate heat using green electricity and / or off-peak electricity.

[0009] In one alternative implementation, the condensate collection module is connected to the evaporator side of the high-temperature heat pump unit.

[0010] In one alternative implementation, the electric heating module is connected to the evaporator side of the high-temperature heat pump unit.

[0011] In one alternative embodiment, the electric heating module includes: an electric heater and a solid heat storage tank; wherein the electric heater is configured to generate electricity and heat using green electricity and / or off-peak electricity; and the solid heat storage tank is configured to store the heat generated by the electric heater; the solid heat storage tank is connected to the evaporator of the high-temperature heat pump unit via heat exchange tubes.

[0012] In one alternative embodiment, the heat exchange tube is filled with a heat exchange medium and is connected to a solid heat storage tank and an evaporator, respectively; and the heat exchange tube is configured to transfer heat from the solid heat storage tank to the evaporator through circulation of the heat exchange medium.

[0013] In one alternative implementation, the steam generation system further includes a power supply module configured to generate green electricity via wind power generation or a photovoltaic-thermal hybrid device.

[0014] In one optional embodiment, the power supply module further includes an inverter configured to convert green electricity into alternating current for use by the low-temperature heat source acquisition device and the steam generator. The beneficial effect of this invention is that the zero-carbon industrial park coupled with waste heat recovery steam generation system obtains condensate from the refrigeration equipment in the production plant through the low-temperature heat source acquisition device, thereby utilizing this portion of condensate with waste heat as the low-temperature heat source for the steam generator. Compared to directly heating low-temperature water to produce steam, using condensate with waste heat effectively reduces the heat required for steam generation, thus saving steam production costs and achieving zero carbon emissions for the system.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the process structure of a steam generation system for zero-carbon industrial park coupled with waste heat recovery provided in an embodiment of this disclosure is shown.

[0019] Figure 2 This invention provides a diagram showing the combination of system equipment energy consumption and cost of producing 1 ton of steam under different low-temperature heat source temperatures in winter, according to an embodiment of this disclosure.

[0020] Figure 3 The diagram illustrates the combination of system equipment energy consumption and system efficiency under different low-temperature heat source temperatures in winter, as provided in the embodiments of this disclosure.

[0021] In the diagram: 1. High-temperature heat pump unit; 2. Low-temperature heat source acquisition device; 3. Flash tank; 4. Water replenishment system; 5. Solid heat storage tank; 6. Electric heater. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions 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, not all embodiments. 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.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0024] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] See Figure 1 , Figure 1A zero-carbon industrial park coupled with waste heat recovery steam generation system is shown, comprising: a low-temperature heat source acquisition device 2 and a steam generation device; the low-temperature heat source acquisition device 2 is configured to provide a low-temperature heat source to the steam generation device; wherein the steam generation device includes: a high-temperature heat pump unit 1; the low-temperature heat source acquisition device 2 is connected to the evaporator side of the high-temperature heat pump unit 1; and the low-temperature heat source acquisition device 2 is configured to deliver condensate with waste heat to the evaporator as a low-temperature heat source for heat exchange of the high-temperature heat pump unit 1.

[0026] In some embodiments, the condensate from the refrigeration equipment in the production plant is obtained by the low-temperature heat source acquisition device 2, and the condensate with waste heat is used as a low-temperature heat source for the steam generator. Compared with directly heating the low-temperature water to produce steam, using condensate with waste heat can effectively reduce the heat required for steam generation, thereby saving steam production costs.

[0027] In some embodiments, the steam generating device further includes: a flash tank 3; the flash tank 3 is connected to the high-temperature heat pump unit 1 via a water pump; wherein the flash tank 3 is configured to obtain high-temperature hot water delivered by the high-temperature heat pump unit 1; and the flash tank 3 is further configured to flash the high-temperature hot water to obtain high-temperature saturated steam.

[0028] As a preferred embodiment, the steam generating device includes: a high-temperature heat pump unit 1, a flash tank 3, a first water pump, and a water replenishment system 4 connected in sequence; the high-temperature heat pump unit 1 produces high-temperature hot water, which is then transported to the flash tank 3 by the first water pump to flash out high-temperature saturated steam, and the unflashed hot water is returned to the condenser side of the high-temperature heat pump unit 1 and replenished by the water replenishment system 4 to compensate for the water loss of the system.

[0029] In some embodiments, the flash tank 3 is connected to the condenser of the high-temperature heat pump unit 1 via a return line; the return line is configured to return unflashed hot water in the flash tank 3 to the condenser side.

[0030] In some embodiments, the low-temperature heat source acquisition device 2 includes: a condensate acquisition module and an electric heating module; wherein the condensate acquisition module is configured to acquire condensate with waste heat from the refrigeration unit; and the electric heating module is configured to generate heat using green electricity and / or off-peak electricity.

[0031] Specifically, the low-temperature heat source acquisition module operates in two modes: winter and summer. In summer, the evaporator side of the high-temperature heat pump unit 1 is connected to the condenser side of the refrigeration unit. Condensate with residual heat is transported to the evaporator side of the high-temperature heat pump unit 1 as a low-temperature heat source. Additionally, the evaporator side of the refrigeration unit can also be connected to users for cooling. In winter, the electric heater utilizes green electricity and off-peak electricity at night to generate heat and stores it in the solid heat storage tank 5, serving as the low-temperature heat source for the high-temperature heat pump unit 1. Furthermore, heat acquired through the photovoltaic-thermal hybrid device also serves as a low-temperature heat source in winter. The heat exchange medium transports part of the heat from the solid heat storage tank 5 and solar thermal energy to the evaporator of the high-temperature heat pump unit 1 as a low-temperature heat source. Additionally, some heat within the solid heat storage tank 5 can be distributed to users for winter heating.

[0032] In some embodiments, the condensate acquisition module is connected to the evaporator side of the high-temperature heat pump unit 1.

[0033] In some embodiments, the electric heating module is connected to the evaporator side of the high-temperature heat pump unit 1.

[0034] In some embodiments, the electric heating module includes: an electric heater 6 and a solid heat storage tank 5; wherein the electric heater 6 is configured to generate electricity and heat using green electricity and / or off-peak electricity; and the solid heat storage tank 5 is configured to store the heat generated by the electric heater 6; the solid heat storage tank 5 is connected to the evaporator of the high-temperature heat pump unit 1 via heat exchange tubes.

[0035] In some embodiments, the heat exchange tube is filled with a heat exchange medium and is connected to the solid heat storage tank 5 and the evaporator respectively; and the heat exchange tube is configured to transfer heat from the solid heat storage tank 5 to the evaporator through the circulation of the heat exchange medium.

[0036] In some embodiments, the steam generation system further includes a power supply module configured to generate green electricity via wind power generation or a photovoltaic-thermal hybrid device.

[0037] In some embodiments, the power supply module further includes an inverter configured to convert green electricity into alternating current for use by the low-temperature heat source acquisition device 2 and the steam generator.

[0038] As an alternative implementation method, taking Jiangsu Province as an example, the steam generation system coupled with waste heat recovery in this zero-carbon park is compared with the steam generation system of traditional electric boilers. In Jiangsu, the local electricity price is 0.66 yuan / kWh during peak hours and 0.38 yuan / kWh during off-peak hours.

[0039] In summer, the condensate temperature of the refrigeration unit is 40℃. Using this steam generation system, producing 1 ton of steam requires 326 kWh of power and costs 215 yuan / ton of steam, with a system efficiency of 2.25. However, taking an electric boiler with an efficiency of 95% as an example, heating 40℃ low-temperature hot water requires 670 kWh of energy to produce 1 ton of steam and costs 442 yuan / ton of steam, resulting in a cost saving of 227 yuan per ton of steam.

[0040] In winter, under the worst-case scenario where there is no green electricity or solar thermal power, only off-peak electricity is used to heat and store water at a normal temperature of 15°C. Figure 2 and Figure 3 The figures show the relationship between system energy consumption, cost, and efficiency when steam is produced directly from room temperature water using an electric boiler, and when the water is heated to different temperatures and then used as a low-temperature heat source for a high-temperature heat pump unit 11 to produce steam. As shown in the figures, when steam is produced using only a traditional electric boiler without the high-temperature heat pump unit 1, the system energy consumption is 734 kWh, the production cost is 484 yuan / ton of steam, and the system efficiency is 0.95. When using off-peak electricity to heat from 15℃ to 100℃ and store the steam, the total energy consumption of the system gradually increases and the system efficiency gradually decreases as the heating temperature rises, while the steam production cost gradually decreases. Furthermore, as the storage temperature increases, the storage cost also increases. Therefore, considering multiple parameters including system energy consumption, efficiency, production cost, and meeting winter heating requirements, this steam generation system sets the storage temperature to 60℃. At this temperature, producing 1 ton of steam requires 471 kWh of power, with a production cost of 245 yuan / ton of steam and an efficiency of 1.56. In the worst-case scenario without green electricity and solar thermal power, the cost per ton of steam production is reduced by 239 yuan. In the optimal scenario utilizing only green electricity and solar thermal power, producing 1 ton of steam requires 230 kWh of power, with a production cost of 152 yuan / ton of steam and a system efficiency of 3.19.

[0041] In summary, the steam generation system coupled with waste heat recovery in this zero-carbon industrial park obtains condensate from the refrigeration equipment in the production plant through the low-temperature heat source acquisition device 2. This condensate with waste heat is then used as a low-temperature heat source for the steam generation device. Compared to directly heating the low-temperature water to produce steam, using condensate with waste heat can effectively reduce the heat required for steam generation, thereby saving steam production costs.

[0042] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0043] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0044] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0045] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0046] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0047] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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.

[0048] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0049] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0050] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0051] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A steam generation system for zero-carbon industrial parks coupled with waste heat recovery, characterized in that, include: Low-temperature heat source acquisition device and steam generation device; The low-temperature heat source acquisition device is configured to provide a low-temperature heat source to the steam generator; in The steam generating device includes: a high-temperature heat pump unit; The low-temperature heat source acquisition device is connected to the evaporator side of the high-temperature heat pump unit; and The low-temperature heat source acquisition device is configured to deliver condensate with residual heat to the evaporator as a low-temperature heat source for heat exchange in a high-temperature heat pump unit.

2. The steam generating system as described in claim 1, characterized in that, The steam generating device further includes: a flash tank; The flash tank is connected to the high-temperature heat pump unit via a water pump; wherein The flash tank is configured to obtain high-temperature hot water delivered by a high-temperature heat pump unit; and The flash tank is also configured to flash hot water to obtain high-temperature saturated steam.

3. The steam generating system as described in claim 2, characterized in that, The flash tank is connected to the condenser of the high-temperature heat pump unit via a return pipeline; The return line is configured to return unflashed hot water from the flash tank to the condenser side.

4. The steam generating system as described in claim 1, characterized in that, The low-temperature heat source acquisition device includes: a condensate acquisition module and an electric heating module; wherein The condensate acquisition module is configured to acquire condensate with waste heat from the refrigeration unit; The electric heating module is configured to generate heat using green electricity and / or off-peak electricity.

5. The steam generating system as described in claim 4, characterized in that, The condensate collection module is connected to the evaporator side of the high-temperature heat pump unit.

6. The steam generating system as described in claim 4, characterized in that, The electric heating module is connected to the evaporator side of the high-temperature heat pump unit.

7. The steam generating system as described in claim 6, characterized in that, The electric heating module includes: an electric heater and a solid heat storage tank; wherein The electric heater is configured to generate electricity and heat using green electricity and / or off-peak electricity; and The solid thermal storage tank is configured to store the heat generated by the electric heater; The solid thermal storage tank is connected to the evaporator of the high-temperature heat pump unit via heat exchange tubes.

8. The steam generating system as described in claim 7, characterized in that, The heat exchange tubes are filled with a heat exchange medium and are connected to a solid heat storage tank and an evaporator, respectively; and The heat exchange tubes are configured to transfer heat from the solid heat storage tank to the evaporator through the circulation of the heat exchange medium.

9. The steam generating system as described in claim 7, characterized in that, Also includes: Power supply module; The power supply module is configured to generate green electricity through wind power generation or a photovoltaic-thermal hybrid device.

10. The steam generating system as described in claim 9, characterized in that, The power supply module also includes: an inverter; The inverter is configured to convert green electricity into alternating current for use by the low-temperature heat source acquisition device and the steam generation device.

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