Steam generating system

Abstract

The utility model relates to the technical field of heat storage, and provides a steam generation system which comprises a heat pump unit used for heating and preparing high-temperature water at a fourth temperature, and the high-temperature water is used for generating first steam at a first pressure; the heat storage device is suitable for storing heat through electric heating in the heat storage time period and preparing second water vapor at the second pressure through heat release in the steam generation time period; the injection device is provided with a high-pressure input end and a low-pressure input end, the high-pressure input end is used for inputting the second water vapor, the low-pressure input end is used for inputting the first water vapor, and the injection device is configured to inject the first water vapor through the second water vapor to form third water vapor at a third temperature; wherein the second pressure is higher than the first pressure; the first water vapor has a first temperature, the second water vapor has a second temperature, and the second temperature is higher than the first temperature. By utilizing the characteristic of high energy efficiency of the heat pump unit and combining with the injection device, the overall energy efficiency of the steam generation system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat storage, in particular to a steam generation system. BACKGROUND

[0002] In order to avoid the emission of combustion exhaust gas, and to utilize clean electric energy and low valley electricity price, the steam generation system provided with an electric heating energy storage module begins to gradually replace the combustion heating steam generation system. Although the existing steam generation system utilizing the electric heating energy storage module can effectively utilize valley electricity for heat storage, and release heat during the flat electricity period or peak electricity period to generate steam, thereby relieving the electricity pressure during the flat electricity period and the peak electricity period, the overall energy efficiency of the current steam generation system utilizing the electric heating energy storage module is low. CONTENT OF THE INVENTION

[0003] In order to solve the above problems, the present application provides a steam generation system, which is designed ingeniously, and the overall energy efficiency of the steam generation system is improved by utilizing the high energy efficiency characteristics of the heat pump unit and combining the ejector device. In addition, it is convenient to upgrade and modify the existing steam generation system to the steam generation system of the present application, and the technical scheme adopted by the present application is as follows:

[0004] A steam generation system, comprising:

[0005] a heat pump unit for preparing high-temperature water at a fourth temperature, the high-temperature water being used to generate first water vapor at a first pressure; a heat storage device adapted to store heat by electric heating during a heat storage period, and to prepare second water vapor at a second pressure by releasing heat during a steam generation period; an ejector device having a high-pressure input end and a low-pressure input end, the high-pressure input end being used to input the second water vapor, and the low-pressure input end being used to input the first water vapor, the ejector device being configured to use the second water vapor to eject the first water vapor to form third water vapor at a third temperature; wherein the second pressure is higher than the first pressure; the first water vapor has a first temperature, and the second water vapor has a second temperature, the second temperature being greater than the first temperature.

[0006] By utilizing the high energy efficiency characteristics of the heat pump unit and combining the ejector device, the steam generation system is improved in overall energy efficiency by using the steam-steam ejecting mode for ejecting.

[0007] In some embodiments, the steam generation system further comprises a flash tank connected to the heat pump unit, and used to generate the first water vapor by using the high-temperature water.

[0008] The first water vapor is generated by the flash tank and the second water vapor is generated by the heat storage device, that is, the first water vapor is not generated by the heat storage device but by the flash tank, which decouples the first water vapor from the heat storage device, facilitating the design and debugging of the first water vapor generation device and the design and debugging of the heat storage device.

[0009] In some embodiments, the steam generation system further comprises: a deionized water supply device for providing deionized water; wherein the heat pump unit is connected to the deionized water supply device, and the heat storage device is connected to the flash tank for generating the second water vapor by using the saturated water in the flash tank; and / or the heat storage device is connected to the deionized water supply device for heating the deionized water to form the second water vapor.

[0010] By providing the deionized water supply device, harmful components such as calcium, magnesium, chlorine ions in the water can be removed, which can form scale or chlorides on the inner wall of the pipeline, causing pipeline corrosion and blockage. By connecting the heat storage device to the flash tank, the second water vapor is generated by using the saturated water discharged from the flash tank through the heat storage device. Since the saturated water discharged from the flash tank is input by the heat pump unit, the heat pump unit has high energy efficiency, and in addition, the temperature of the saturated water discharged from the flash tank is higher than that of the deionized water directly input into the heat storage device, so compared with the heat storage device directly using deionized water to produce the second water vapor, this way improves the energy efficiency of the steam generation system.

[0011] In some embodiments, the steam generation system further comprises: a heat-insulated water storage device for storing the high-temperature water; the heat storage device is connected to the heat-insulated water storage device for generating the second water vapor by using the high-temperature water; and the heat storage device comprises a plurality of heat storage modules, and the plurality of heat storage modules comprise a first heat storage module, which is used for generating the first water vapor by using the high-temperature water during the steam generation period.

[0012] By setting the heat preservation water storage device and connecting the heat preservation water storage device to the heat storage device, the second water vapor is generated by the high-temperature water discharged from the heat preservation water storage device passing through the heat storage device. Since the high-temperature water discharged from the heat preservation water storage device is input by the heat pump unit, the heat pump unit has high energy efficiency. In addition, the temperature of the high-temperature water discharged from the heat preservation water storage device is higher than that of the deionized water directly input into the heat storage device. Therefore, compared with the heat storage device directly using the deionized water to produce the second water vapor, the energy efficiency of the steam generation system is improved. In addition, the first water vapor can be generated by the first heat storage module in the heat storage device, without the need to set a flash tank, thereby reducing the construction cost. In addition, by setting the heat preservation water storage device, the heat pump unit can use valley electricity to produce high-temperature water and store the high-temperature water in the heat preservation water storage device, so that the steam generation system can avoid the situation that the heat pump unit needs to work during the steam generation stage, or can reduce the power consumption of the heat pump unit during the steam generation stage, thereby reducing the occupation of the heat pump unit to the power during the valley electricity period or the peak electricity period.

[0013] In some embodiments, the heat exchange pipelines of at least two heat storage modules are configured to be switchable between parallel connection to constitute a steam generation passage and series connection to constitute a steam generation passage.

[0014] By configuring the heat exchange pipelines of at least two heat storage modules to be switchable between parallel connection to constitute a steam generation passage and series connection to constitute a steam generation passage, the adaptability of the steam generation system to changes in the required steam amount on the user side can be improved. For example, when the heat exchange pipelines of two heat storage modules are connected in parallel, due to different parameter configurations or heat release sequence problems of the two heat storage modules, temperature inconsistency may occur in the two heat storage modules, for example, one of the temperatures is low and can be used to heat the high-temperature water, and the other temperature is high and can be used to generate the second water vapor. At this time, the heat exchange pipelines of the two heat storage modules can be switched to series connection. The high-temperature water passes through the heat storage module with a lower temperature and then enters the heat storage module with a higher temperature. In this way, the amount of the second water vapor generated by the heat storage module with a higher temperature can be improved, that is, the ability of the heat storage module with a higher temperature to supply the second water vapor can be improved.

[0015] In some embodiments, the first heat storage module has a heat exchange pipeline and a first steam pipeline. The heat exchange pipeline is used to heat the inflowing high-temperature water into the second water vapor. The first steam pipeline is drawn from a set position of the heat exchange pipeline and is used to output the first water vapor.

[0016] By jointly arranging the heat exchange pipeline and the first steam pipeline on the same heat storage module, compared with arranging the heat exchange pipeline and the first steam pipeline on different heat storage modules respectively, the number of heat storage modules can be reduced, and the construction cost and land occupation of the heat storage device can be saved.

[0017] In some embodiments, the heat preservation water storage device is adapted to store high-temperature water with a pressure greater than one atmosphere and a temperature greater than 100℃.

[0018] By setting the heat preservation water storage device to have the function of storing high-temperature water with a pressure greater than one atmosphere and a temperature greater than 100℃, the high energy efficiency of the heat pump unit can be fully utilized, and the overall energy efficiency of the steam generation system can be improved.

[0019] In some embodiments, the steam generation system further comprises a desuperheater having a high-temperature input end and a low-temperature input end, the high-temperature input end being configured to input the third water vapor, and the low-temperature input end being configured to input desuperheating water.

[0020] By setting the desuperheater, the temperature of the third water vapor output by the ejector and then entering the desuperheater can be accurately adjusted, so that the steam temperature output to the user side is stable and meets the requirements.

[0021] In some embodiments, the desuperheating water comprises the high-temperature water; and / or, the desuperheating water comprises deionized water provided by a deionized water supply device.

[0022] By using the high-temperature water prepared by the heat pump unit as desuperheating water, the high energy efficiency of the heat pump unit can be fully utilized, and the overall energy efficiency of the steam generation system can be improved.

[0023] In another aspect, the present application also provides a steam generation system, comprising:

[0024] a heat pump unit configured to prepare high-temperature water at a fourth temperature; a heat storage device adapted to store heat by electric heating during a heat storage period, and to prepare second water vapor at a second pressure by heating the high-temperature water during a steam generation period; and an ejector having a high-pressure input end and a low-pressure input end, the high-pressure input end being configured to input the second water vapor, and the low-pressure input end being configured to input the high-temperature water, the ejector being configured to use the second water vapor to eject the high-temperature water to form third water vapor at a third temperature.

[0025] By utilizing the high energy efficiency characteristics of the heat pump unit and combining the ejector, the steam-liquid ejecting mode is used for ejecting, which improves the overall energy efficiency of the steam generation system. Compared with the steam-steam ejecting scheme, the steam-liquid ejecting scheme does not need to generate first water vapor, thereby simplifying the system configuration, for example, without the need for a flash tank, and without the need for a pipeline for the heat storage module to generate first water vapor.

[0026] The steam generation system provided by the present application has at least one of the following beneficial effects:

[0027] 1. The steam generation system provided by the application improves the overall energy efficiency of the steam generation system by utilizing the high energy efficiency of the heat pump unit and combining with the ejector device to adopt steam steam injection.

[0028] 2. The steam generation system provided by the application utilizes the flash tank to generate the first water vapor and utilizes the heat storage device to generate the second water vapor, that is, the first water vapor can be generated by the flash tank instead of the heat storage device, thereby realizing the decoupling of the first water vapor and the heat storage device, facilitating the design and debugging of the first water vapor generation device and the design and debugging of the heat storage device.

[0029] 3. The steam generation system provided by the application can remove harmful components in water, such as calcium, magnesium, chlorine ions, etc., by setting the deionized water supply device. These ions can form scale or chlorides on the inner wall of the pipeline, thereby causing pipeline corrosion and blockage.

[0030] 4. The steam generation system provided by the application connects the heat storage device to the flash tank, utilizes the saturated water discharged from the flash tank to pass through the heat storage device to generate the second water vapor, because the saturated water discharged from the flash tank is input by the heat pump unit, and the heat pump unit has high energy efficiency, in addition, the temperature of the saturated water discharged from the flash tank is higher than that of the deionized water directly input into the heat storage device, so compared with the heat storage device directly utilizing the deionized water to produce the second water vapor, this way improves the energy efficiency of the steam generation system.

[0031] 5. The steam generation system provided by the application sets the heat preservation water storage device and connects the heat preservation water storage device to the heat storage device, utilizes the high-temperature water discharged from the heat preservation water storage device to pass through the heat storage device to generate the second water vapor, because the high-temperature water discharged from the heat preservation water storage device is input by the heat pump unit, and the heat pump unit has high energy efficiency, in addition, the temperature of the high-temperature water discharged from the heat preservation water storage device is higher than that of the deionized water directly input into the heat storage device, so compared with the heat storage device directly utilizing the deionized water to produce the second water vapor, this way improves the energy efficiency of the steam generation system. In addition, the first water vapor can be generated by the first heat storage module in the heat storage device, without the need to set the flash tank, thereby reducing the construction cost. In addition, by setting the heat preservation water storage device, the heat pump unit can utilize valley electricity to produce high-temperature water and store the high-temperature water in the heat preservation water storage device, which can avoid the situation that the heat pump unit needs to work during the steam generation stage of the steam generation system, or can reduce the power pressure of the heat pump unit during the steam generation stage of the steam generation system, thereby reducing the occupation of electricity by the heat pump unit during the valley electricity period or the peak electricity period.

[0032] 6. The steam generation system provided in this application improves the adaptability of the steam generation system to changes in the amount of steam required by the user by configuring the heat exchange pipes of at least two thermal storage modules to be connected in parallel or in series to form a steam generation path. For example, when the heat exchange pipes of two thermal storage modules are connected in parallel, the temperature of the two thermal storage modules may be inconsistent due to different parameter configurations or heat release sequence. For example, one module may have a lower temperature and be used to heat high-temperature water, while the other module may have a higher temperature and be used to generate second water vapor. In this case, the heat exchange pipes of the two thermal storage modules can be switched to a series connection, so that the high-temperature water passes through the lower-temperature thermal storage module and then enters the higher-temperature thermal storage module. This can increase the amount of second water vapor generated by the higher-temperature thermal storage module, that is, improve the ability of the higher-temperature thermal storage module to supply second water vapor.

[0033] 7. The steam generation system provided in this application, by setting the heat exchange pipe and the first steam pipe together on the same heat storage module, can reduce the number of heat storage modules and save the construction cost and space of the heat storage device compared to setting the heat exchange pipe and the first steam pipe on different heat storage modules.

[0034] 8. The steam generation system provided in this application, by setting the heat-insulating water storage device to have the function of storing high-temperature water with a pressure greater than one atmosphere and a temperature higher than 100°C, can give full play to the high energy efficiency of the heat pump unit and improve the overall energy efficiency of the steam generation system.

[0035] 9. The steam generation system provided in this application can precisely regulate the temperature of the third steam that is output from the ejector device and then enters the desuperheater by setting a desuperheater, so that the steam temperature output to the user side is stable and meets the requirements.

[0036] 10. The steam generation system provided in this application can fully utilize the high energy efficiency of the heat pump unit by using the high-temperature water prepared by the heat pump unit as desuperheating water, which is conducive to improving the overall energy efficiency of the steam generation system.

[0037] 11. The steam generation system provided in this application utilizes the high energy efficiency of a heat pump unit and combines it with an ejector device to perform steam-liquid ejection, thereby improving the overall energy efficiency of the steam generation system. Compared with the steam-steam ejection scheme, this steam-liquid ejection scheme does not require the generation of first water vapor, thus simplifying the system configuration. For example, it eliminates the need for a flash tank and the need to configure pipelines for generating first water vapor for the thermal storage module. Attached Figure Description

[0038] The above features, technical characteristics, advantages and implementation manners of the steam generating system will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings as follows:

[0039] Figure 1 is a system structure diagram of the first embodiment of the present application;

[0040] Figure 2 is a system structure diagram of the second embodiment of the present application;

[0041] Figure 3 is a system structure diagram of the third embodiment of the present application;

[0042] Figure 4 is a system structure diagram of the fourth embodiment of the present application;

[0043] Figure 5 is a system structure diagram of the fifth embodiment of the present application;

[0044] Figure 6 is a system structure diagram of the sixth embodiment of the present application;

[0045] Figure 7 is a system structure diagram of the seventh embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0047] In order to make the drawings simple, only the parts related to the present application are schematically shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0048] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0049] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] refer to Figures 1-7 This application provides a steam generation system, comprising: a heat pump unit for preparing high-temperature water at a fourth temperature, wherein the high-temperature water is used to generate first steam at a first pressure; a heat storage device adapted to store heat by electric heating during a heat storage period and to generate second steam at a second pressure by releasing heat during a steam generation period; and an ejector device having a high-pressure input terminal and a low-pressure input terminal, wherein the high-pressure input terminal is used to input the second steam and the low-pressure input terminal is used to input the first steam, and the ejector device is configured to use the second steam to eject the first steam to form third steam at a third temperature; wherein the second pressure is higher than the first pressure; the first steam has a first temperature and the second steam has a second temperature, wherein the second temperature is greater than the first temperature.

[0052] Specifically, a heat pump unit can be Figures 1-7 The waste heat source heat pump units shown (including waste hot water heat pump units, waste hot gas heat pump units, etc.) can also be geothermal heat pump units (including surface water heat pump units, groundwater heat pump units, soil source heat pumps, etc.), or transcritical carbon dioxide heat pump units, etc. It is understood that the types of heat pump units listed above should not be considered as limitations on the specific types of heat pump units in this application. The ejector device refers to... Figures 1-7 The ejector shown.

[0053] In addition, the heat storage material in the heat storage device of the present application can be a molten salt, such as a molten salt formed by mixing 50% sodium nitrate and 50% potassium nitrate, or a molten salt formed by mixing 60% sodium nitrate and 40% potassium nitrate, or a low-melting-point molten salt disclosed in the patent with application number CN201911219662 (melting point as low as about 80°), or a multi-component mixed molten salt disclosed in the patent with application number CN202311105206 (melting point as low as 47.3°), or a solid heat storage medium such as ceramic granules, metal balls, metal blocks, corundum balls, ores, glass, etc. It should be noted that the heat storage material can also be a heat storage brick. The heat storage material in the heat storage device can be a combination of one or more of the above example materials. It can be understood that the above-listed heat storage material types should not be considered as a limitation on the specific type of heat storage material in the present application.

[0054] The heat storage device generally includes an electric heating device, a storage container filled with heat storage material, and a heat exchange pipeline. The electric heating device is used to heat the heat storage material to store heat energy. The heat exchange pipeline uses the heat energy of the heat storage material to heat water or steam flowing through the heat exchange pipeline. The specific structure of the heat storage device is prior art and is not the focus of the present application, and will not be described here.

[0055] In the present application, the high energy efficiency characteristics of the heat pump unit are utilized, and the ejector device is combined to use the steam-steam ejecting mode for ejecting, thereby improving the overall energy efficiency of the steam generation system.

[0056] Reference Figures 1-3 In one embodiment, the steam generation system further includes a flash tank connected to the heat pump unit, and the flash tank generates the first water vapor using the high-temperature water output by the heat pump unit. In other embodiments, the first water vapor can be generated without using the flash tank, but using the heat storage device (see Figures 4-6 ). The first water vapor is generated using the flash tank, and the second water vapor is generated using the heat storage device, that is, the first water vapor can not be generated by the heat storage device, but by the flash tank, which decouples the first water vapor from the heat storage device, facilitating the design and debugging of the first water vapor generation device and the design and debugging of the heat storage device.

[0057] For the above technical solution with a flash tank, in one specific embodiment, referring to Figures 1-3 , the heat storage device includes three heat storage modules (referring to the #1 heat storage device, the #2 heat storage device, and the #3 heat storage device shown in Figures 1-3 ), all of which can generate the second water vapor. The second water vapor generated by the three heat storage modules passes through the steam distribution cylinder to the ejector device (referring to Figures 1-3the ejector shown in FIG. 1). It can be understood that when the heat storage module capable of providing the second water vapor is one, the separation cylinder is not required, and the second water vapor generated by the single heat storage module is directly led to the ejector (referring to the ejector shown in FIG. 1). Figures 1-3 the ejector shown in FIG. 1).

[0058] With reference to Figure 2 , Figure 3 In one embodiment, the steam generation system further comprises a deionized water supply device for providing deionized water. In a first scheme, the heat pump unit is connected to the deionized water supply device, and the heat storage device is connected to the flash tank, and the heat storage device generates the second water vapor by using the saturated water output from the flash tank; in a second scheme, the heat storage device is connected to the deionized water supply device for heating the deionized water to form the second water vapor. Only one of the first scheme and the second scheme can be provided in the steam generation system, or both the first scheme and the second scheme can be provided. The deionized water supply device refers to the water treatment device shown in FIG. 1. It can be understood that the first scheme and the second scheme can further comprise a pure water tank for storing the deionized water, and the pure water tank supplies the deionized water required by the heat pump unit or the heat storage device. Figures 1-7 It can be understood that by providing the deionized water supply device, harmful components such as calcium, magnesium, chlorine and the like in the water can be removed, and the harmful components can form scale or chlorides on the inner wall of the pipeline, thereby causing corrosion and blockage of the pipeline. In the first scheme, the heat storage device is connected to the flash tank, and the second water vapor is generated by using the saturated water output from the flash tank through the heat storage device. The saturated water output from the flash tank is input by the heat pump unit, and the heat pump unit has high energy efficiency. In addition, the temperature of the saturated water output from the flash tank is higher than that of the deionized water directly input into the heat storage device in the second scheme. Therefore, compared with the second scheme in which the heat storage device directly uses the deionized water to generate the second water vapor, the energy efficiency of the steam generation system is improved.

[0059] With reference to

[0060] In one embodiment, a preheating circulation pipeline is further provided between the heat pump unit and the heat storage device, and the high-temperature water output by the heat pump unit is used to preheat the heat storage material in the heat storage device. After the heat storage material is preheated by the high-temperature water, the high-temperature water flows back to the heat pump unit, thereby forming a circulation preheating of the heat storage device by the heat pump unit. In this way, the power consumption of the heat storage device during heat storage can be reduced. In addition, the energy efficiency of the heat pump unit is higher than that of the heat storage device, and the power consumption of the entire steam generation system can be reduced, and the energy efficiency of the steam generation system is improved. Figure 3 Unlike the related art scheme provided with the flash tank, with reference to

[0061] the ejector shown in FIG. 1). Figures 4-7In one embodiment, the steam generation system further comprises a heat preservation water storage device, i.e. the heat preservation water storage tank shown in Figures 4-7 , for storing the high-temperature water; the heat storage device is connected to the heat preservation water storage device, and the heat storage device generates the second water vapor using the high-temperature water output by the heat preservation water storage device; the heat storage device comprises a plurality of heat storage modules (for example, the #3 heat storage device, the #2 heat storage device, and the #1 heat storage device shown in Figures 4-7 ), and the plurality of heat storage modules comprise a first heat storage module (for example, the #3 heat storage device shown in Figures 4-7 ), which is used to generate the first water vapor using the high-temperature water during the steam generation period, and other heat storage modules are used to generate the second water vapor using the high-temperature water.

[0062] It can be understood that, by providing the heat preservation water storage device and connecting the heat preservation water storage device to the heat storage device, the second water vapor is generated by the high-temperature water discharged from the heat preservation water storage device passing through the heat storage device, because the high-temperature water discharged from the heat preservation water storage device is input by the heat pump unit, and the heat pump unit has high energy efficiency, and in addition, the temperature of the high-temperature water discharged from the heat preservation water storage device is higher than that of the deionized water directly input to the heat storage device, so compared with the heat storage device directly using the deionized water to produce the second water vapor, the energy efficiency of the steam generation system is improved. In addition, the first water vapor can be generated by the first heat storage module in the heat storage device, without the need to provide a flash tank, thereby reducing the construction cost. In addition, by providing the heat preservation water storage device, the heat pump unit can use off-peak electricity to produce high-temperature water, and store the high-temperature water in the heat preservation water storage device, which can avoid the situation that the heat pump unit needs to work during the steam generation period of the steam generation system, or can reduce the power consumption pressure of the heat pump unit during the steam generation period of the steam generation system, thereby reducing the occupation of electricity by the heat pump unit during the off-peak period or the peak period.

[0063] For the above technical solution provided with the heat preservation water storage device, in one specific embodiment, referring to Figures 4-6 , the heat storage device comprises at least two heat storage modules (referring to the #2 heat storage device and the #3 heat storage device shown in Figures 4-6 ), both of which can generate the second water vapor, and the second water vapor generated by the two heat storage modules passes through the steam distribution cylinder to the ejector device (referring to the ejector shown in Figures 4-6 ). It can be understood that, when there is only one heat storage module that can provide the second water vapor, the steam distribution cylinder does not need to be provided, and the second water vapor generated by the single heat storage module directly passes to the ejector device (referring to the ejector shown in Figures 4-6 ).

[0064] In one specific embodiment, referring to Figure 4 , the first heat storage module (for example, the #3 heat storage device shown in Figure 4The #3 thermal storage device shown is only used to generate the first water vapor, while other thermal storage modules (e.g.) Figure 4 The #2 and #1 thermal storage devices shown are only used to generate the second type of water vapor. In another specific embodiment, refer to... Figure 6 The first thermal storage module (e.g.) Figure 4 The #3 thermal storage device shown has a heat exchange pipe and a first steam pipe. The heat exchange pipe is used to heat the incoming high-temperature water into second steam. The first steam pipe extends from a designated position of the heat exchange pipe to output the first steam. It is understood that... Figure 6 In the illustrated embodiment, the first steam pipe is part of a heat exchange pipe, or in other words, the first steam pipe and the heat exchange pipe share a common heat exchange section. The heat exchange pipe has a longer heat exchange path, while the first steam pipe has a shorter heat exchange path. Figure 6 In the illustrated embodiment, the first thermal storage module (e.g. Figure 4 The #3 thermal storage device shown can not only be used to generate the first water vapor, but also simultaneously to generate the second water vapor, while other thermal storage modules (e.g.) Figure 6 The #2 and #1 thermal storage devices shown are only used to generate the second steam. In other embodiments, the first steam pipe and the heat exchange pipe installed on the first thermal storage module can be independent of each other.

[0065] It is easy to understand that by setting the heat exchange pipe and the first steam pipe together on the same heat storage module, compared with setting the heat exchange pipe and the first steam pipe on different heat storage modules, the number of heat storage modules can be reduced, thus saving the construction cost and space required for the heat storage device.

[0066] refer to Figure 5 In one embodiment, at least two of the thermal storage modules (e.g.) Figure 5 The heat exchange pipes of the #3 and #2 thermal storage units shown are configured to switch between parallel connection to form a steam generation path and series connection to form a steam generation path. It is important to note that by configuring the heat exchange pipes of at least two thermal storage modules to switch between parallel connection to form a steam generation path and series connection to form a steam generation path, the adaptability of the steam generation system to changes in the amount of steam required by the user side can be improved. For example, when the heat exchange pipes of two thermal storage modules are connected in parallel, due to different parameter configurations or heat release sequence issues, the two thermal storage modules may experience temperature inconsistencies, such as one module having a lower temperature (e.g., a lower temperature). Figure 5 The #3 thermal storage device shown can be used to heat high-temperature water, while another high-temperature (e.g., Figure 5the #2 heat storage device shown in FIG. 2), can be used to generate the second water vapor, at this time, the heat exchange pipes of the two heat storage modules can be switched to be connected in series, the high-temperature water passes through the heat storage module with a lower temperature (for example Figure 5 the #3 heat storage device shown in FIG. 3) and then enters the heat storage module with a higher temperature (for example Figure 5 the #2 heat storage device shown in FIG. 2), so that the amount of the second water vapor generated by the heat storage module with a higher temperature can be increased, that is, the ability of the heat storage module with a higher temperature to supply the second water vapor can be improved.

[0067] Referring to Figure 5 In an embodiment, the heat preservation water storage device is adapted to store high-temperature water with a pressure greater than one atmosphere, and the fourth temperature is greater than 100°C. By setting the heat preservation water storage device to have the function of storing high-temperature water with a pressure greater than one atmosphere and a temperature higher than 100°C, the high energy efficiency of the heat pump unit can be fully utilized, which is conducive to improving the overall energy efficiency of the steam generation system. The higher the pressure and temperature of the high-temperature water, the less heat required by the heat storage device to heat the high-temperature water into the second water vapor, thereby reducing the power consumption of the heat storage device and improving the overall energy efficiency of the steam generation system.

[0068] Referring to Figures 1-7 In an embodiment, the steam generation system further comprises a desuperheater having a high-temperature input end and a low-temperature input end, the high-temperature input end being used to input the third water vapor, and the low-temperature input end being used to input desuperheating water. By setting the desuperheater, the temperature of the third water vapor output by the ejector and then entering the desuperheater can be accurately adjusted, so that the steam temperature output to the user side is stable and meets the requirements. Figures 1-6 In the embodiment shown in FIG. 6, the desuperheating water is deionized water provided by the deionized water supply device, in other embodiments, the desuperheating water is saturated water provided by the flash tank or high-temperature water provided by the heat preservation water storage device or high-temperature water directly provided by the heat pump unit, and in Figure 7 In the embodiment shown in FIG. 6, the heat preservation water storage device can provide the desuperheater with desuperheating water, and the deionized water supply device can also provide the desuperheater with desuperheating water. It can be understood that by using the saturated water provided by the flash tank or the high-temperature water provided by the heat preservation water storage device or the high-temperature water directly provided by the heat pump unit as the desuperheating water, the high energy efficiency of the heat pump unit can be fully utilized, which is conducive to improving the overall energy efficiency of the steam generation system.

[0069] In order to better illustrate the beneficial effects of the present application, the following will be described in combination with Figure 1The embodiment is illustrated as follows: assuming that there is a factory with a large amount of waste heat, and superheated steam (i.e. the third water vapor) of 0.6 MPa and 180°C is needed. First, a waste heat source heat pump unit is used to produce 100 t / h of high-temperature water of 0.5 MPa and 140°C by using the waste heat of the factory, and 1.3 t / h of saturated steam (i.e. the first water vapor) of 0.3 MPa and 133°C can be obtained by flash evaporation, and the remaining 98.7 t / h of saturated water plus 1.3 t / h of make-up water (supplied by a deionized water supply device) of 15°C is re-circulated to the heat pump unit for heat absorption, and the heating power of the heat pump unit is about 1 MW.

[0070] Next, the ejector is constructed, since the target gas pressure is 0.6 MPa, the pressure of the induced gas (i.e. the first water vapor) is 0.3 MPa, i.e. the compression ratio of the ejector is 2, according to the calculation, when the expansion ratio is 10, the entrainment coefficient is 0.5, i.e. the pressure of the induced gas (i.e. the second water vapor) needs to be 3 MPa, and the flow rate is 2.6 t / h.

[0071] The heat storage device can easily output superheated steam (i.e. the second water vapor) of 3 MPa and 250°C as the induced steam by adjusting the pressure of the feed water pump. That is, 2.6 t / h of steam (i.e. the second water vapor) of 3 MPa and 250°C generated by the heat storage device induces 1.3 t / h of steam (i.e. the first water vapor) of 0.3 MPa and 133°C generated by the flash tank, and finally 3.9 t / h of high-temperature steam (i.e. the third water vapor) of about 0.6 MPa and 180°C is obtained.

[0072] The induced gas and the induced gas form the final mixed gas in a ratio of 1:0.5, since the induced gas is generated by the heat pump unit, if the COP (energy efficiency ratio) of the heat pump unit is 3, the power consumption of the 0.5 parts of gas is only 0.17, i.e. the energy saving amount is 1-(1+0.17) / (1+0.5)=22% compared with the scheme of only using the heat storage device to generate high-temperature steam (i.e. the third water vapor) of about 0.6 MPa and 180°C, and if the heat storage efficiency of the heat storage device is considered to be 90%, the energy saving amount is greater.

[0073] According to the above parameters, it is calculated that only using the heat storage device to produce 1 ton of steam of 0.6 MPa and 180°C requires 840 kWh of electric energy, and after using the ejector technology, 1 / (1+0.5) tons of steam of 3 MPa and 250°C (i.e. the second water vapor) in 1 ton of steam is provided by the heat storage device, which consumes 570 kWh of electric energy; 0.5 / (1+0.5) tons of steam of 0.3 MPa and 133°C (i.e. the first water vapor) is provided by the heat pump unit through flash evaporation, and the power consumption is 80 kWh according to the COP (energy efficiency ratio) of 3, and the total power consumption is 650 kWh, which is decreased by 22% compared with 840 kWh.

[0074] If the ejector compression ratio decreases (the user side needs smaller steam pressure or the heat pump unit provides higher pressure saturated steam), the expansion ratio increases (the heat storage device provides higher pressure ejector steam), the ejector coefficient will increase, so that the same flow of ejector steam (i.e. second water vapor) can eject more saturated steam (i.e. first water vapor), that is, the energy ratio of saturated steam will be larger, and the energy saving effect will be more significant. In addition, if the COP (energy efficiency ratio) of the heat pump unit is improved, the energy saving effect will also be improved.

[0075] Reference Figure 7 The application also provides a steam generation system, comprising: a heat pump unit for preparing high-temperature water at a fourth temperature; a heat storage device adapted to store heat by electric heating during a heat storage period, and to prepare second water vapor at a second pressure by heating the high-temperature water during a steam generation period; and an ejector device having a high-pressure input end and a low-pressure input end, the high-pressure input end being used for inputting the second water vapor, and the low-pressure input end being used for inputting the high-temperature water, the ejector device being configured to use the second water vapor to eject the high-temperature water to form third water vapor at a third temperature. Figures 1-6 Unlike the embodiments shown, Figure 7 In the embodiments shown, vapor-liquid ejection can be achieved by high-temperature water and second water vapor, without the need to generate first water vapor. By utilizing the high energy efficiency characteristics of the heat pump unit, and combining the ejector device, the vapor-liquid ejection method is used for ejection, which improves the overall energy efficiency of the steam generation system. Compared with the vapor-vapor ejection scheme, this vapor-liquid ejection scheme does not need to generate first water vapor, thereby simplifying the system configuration, for example, without the need for a flash tank, and without the need to configure a pipeline for the heat storage module to generate first water vapor.

[0076] In addition, the application also provides a steam generation method, comprising the steps of: a heat pump unit preparing high-temperature water at a fourth temperature; using the high-temperature water to prepare first water vapor at a first pressure; a heat storage device storing heat by electric heating during a heat storage period; the heat storage device preparing second water vapor at a second pressure by heat release during a steam generation period; an ejector device using the second water vapor to eject the first water vapor to form third water vapor at a third temperature; wherein the second pressure is higher than the first pressure; the first water vapor has a first temperature, and the second water vapor has a second temperature, the second temperature being greater than the first temperature.

[0077] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the application, and it should be pointed out that for ordinary skilled persons in the technical field, several improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A steam generating system, characterized in that, include: A heat pump unit is used to prepare high-temperature water at a fourth temperature, which is used to generate first water vapor at a first pressure. A heat storage device is suitable for storing heat by electric heating during the heat storage period and for generating second steam at a second pressure by releasing heat during the steam generation period; An ejector device has a high-pressure input terminal and a low-pressure input terminal. The high-pressure input terminal is used to input the second water vapor, and the low-pressure input terminal is used to input the first water vapor. The ejector device is configured to use the second water vapor to eject the first water vapor to form a third water vapor at a third temperature. Wherein, the second pressure is higher than the first pressure; The first water vapor has a first temperature, and the second water vapor has a second temperature, the second temperature being greater than the first temperature.

2. The steam generating system as described in claim 1, characterized in that, Also includes: A flash tank, connected to the heat pump unit, is used to generate the first water vapor using the high-temperature water.

3. The steam generating system as described in claim 2, characterized in that, Also includes: A deionized water supply device for providing deionized water; The heat pump unit is connected to the deionized water supply device, and the heat storage device is connected to the flash tank, for generating the second water vapor using the saturated water in the flash tank. And / or, The heat storage device is connected to the deionized water supply device and is used to heat the deionized water to form the second water vapor.

4. The steam generating system as described in claim 1, characterized in that, Also includes: A thermal insulation water storage device is used to store the high-temperature water; The heat storage device is connected to the heat-insulating water storage device and is used to generate the second water vapor using the high-temperature water. The heat storage device includes multiple heat storage modules, including a first heat storage module. During the steam generation period, the first heat storage module is used to generate the first water vapor using the high-temperature water.

5. The steam generating system as described in claim 4, characterized in that, At least two of the heat exchange pipes of the thermal storage modules are configured to switch between being connected in parallel to form a steam generation path and being connected in series to form a steam generation path.

6. The steam generating system as described in claim 4, characterized in that, The first thermal storage module has a heat exchange pipe and a first steam pipe. The heat exchange pipe is used to heat the incoming high-temperature water into the second steam. The first steam pipe is led out from a set position of the heat exchange pipe and is used to output the first steam.

7. The steam generating system as described in claim 4, characterized in that, The insulated water storage device is suitable for storing high-temperature water with a pressure greater than one atmosphere, and the fourth temperature is greater than 100°C.

8. The steam generating system according to any one of claims 1 to 7, characterized in that, Also includes: The desuperheater has a high-temperature input terminal and a low-temperature input terminal. The high-temperature input terminal is used to input the third water vapor, and the low-temperature input terminal is used to input desuperheating water.

9. The steam generating system as described in claim 8, characterized in that, The cooling water includes the high-temperature water; And / or, The cooling water includes deionized water supplied by a deionized water supply device.

10. A steam generation system, characterized in that, include: Heat pump units are used to produce high-temperature water at a fourth temperature. A heat storage device is suitable for storing heat by electric heating during the heat storage period and for generating second steam at a second pressure by heating the high-temperature water during the steam generation period. The ejector device has a high-pressure input terminal and a low-pressure input terminal. The high-pressure input terminal is used to input the second water vapor, and the low-pressure input terminal is used to input the high-temperature water. The ejector device is configured to use the second water vapor to eject the high-temperature water to form a third water vapor at a third temperature.

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