Molten salt heat storage system with preheating function
By installing coils in the molten salt thermal storage system to heat water from the deaerator, the problem of damage caused by large temperature differences in the heat exchanger is solved, effective preheating protection is achieved, and costs are reduced.
Patent Information
- Application Number
- CN202423237926.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing molten salt thermal energy storage systems suffer from damage due to large temperature differences during heat exchanger preheating, and external gas source preheating systems increase investment costs but have low utilization rates.
By installing coils inside the shell of the molten salt tank, the water output from the deaerator is used to heat the high-temperature molten salt tank, generating hot water to slowly preheat the heat exchanger, thus avoiding the direct use of an external gas source.
It achieves effective preheating of the heat exchanger, protects the heat exchanger, saves costs, and eliminates the need for additional equipment.
Smart Images
Figure CN223910106U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to molten salt energy storage technology field, specifically, relate to a kind of with preheating function's molten salt heat storage system. BACKGROUND
[0002] Molten salt heat storage system is a kind of efficient energy storage technology, molten salt heat storage system uses molten salt as heat transfer and heat storage medium, it is often applied to solar thermal power generation, steel enterprise preheating utilization etc.
[0003] In the heat storage process, solar radiation energy or other heat sources are used as the energy source to heat the molten salt. The temperature of the molten salt is raised by heating, and the high-temperature molten salt is stored in the hot salt tank. In the heat release process, the high-temperature molten salt is transported to the steam generation system or the heat exchanger by the molten salt pump, and exchanges heat with water or water vapor to produce high-temperature and high-pressure superheated steam or hot water. The cold salt after heat release returns to the cold salt tank, completing a cycle.
[0004] In the heat exchanger, the hot molten salt and the cold water exchange heat. If preheating is not performed, the temperature difference between the two sides of the heat exchanger is large, which can easily cause damage to the heat exchanger. In the prior art, an external gas source is usually used to preheat the heat exchanger. The additional external gas source system increases the investment cost. The external gas source is only used when the system starts, and the utilization rate is not high. UTILITY MODEL CONTENTS
[0005] The utility model aims to provide a molten salt heat storage system with preheating function. Through reasonable pipeline design, the original equipment can be used to achieve preheating, saving costs.
[0006] The embodiments of the utility model are implemented as follows:
[0007] A molten salt heat storage system with preheating function includes a deaerator, a molten salt tank, and a heat exchanger. The shell of the molten salt tank is provided with a coil pipe. The inlet end of the coil pipe is in communication with the outlet end of the deaerator, and the outlet end of the coil pipe is in communication with the cold side inlet of the heat exchanger.
[0008] Further, in other preferred embodiments of the utility model, the molten salt heat storage system further includes a steam collecting header. The steam inlet of the steam collecting header is in communication with the cold side outlet of the heat exchanger.
[0009] Further, in other preferred embodiments of the utility model, the steam collecting header is provided with a first steam outlet. The first steam outlet is in communication with the steam inlet of the deaerator.
[0010] Further, in other preferred embodiments of the utility model, the steam collecting header is further provided with a second steam outlet. The second steam outlet is in communication with the thermal application unit. Further, in other preferred embodiments of the utility model, the steam collecting header is further provided with a second steam outlet. The second steam outlet is in communication with the thermal application unit.
[0011] Further, in other preferable embodiments of the present application, the hot side inlet of the heat exchanger is in communication with the molten salt outlet of the molten salt tank, and the hot side outlet of the heat exchanger is in communication with the molten salt inlet of the molten salt tank.
[0012] Further, in other preferable embodiments of the present application, the deaerator is provided with a liquid inlet pipe and a vent pipe, the liquid inlet pipe is in communication with external water, and the vent pipe is in communication with external atmosphere.
[0013] Further, in other preferable embodiments of the present application, the liquid outlet end of the deaerator is further provided with a variable frequency water supply pump, and the liquid outlet end of the deaerator is connected with the liquid inlet end of the coil through the variable frequency water supply pump.
[0014] The embodiment of the present application has the following beneficial effects:
[0015] The embodiment of the present application provides a molten salt heat storage system with preheating function, which comprises a deaerator, a molten salt tank and a heat exchanger; a coil is arranged in the shell of the molten salt tank, the liquid inlet end of the coil is in communication with the liquid outlet end of the deaerator, and the liquid outlet end of the coil is in communication with the cold side inlet of the heat exchanger. The water output from the deaerator passes through the shell of the molten salt tank, and hot water is generated under the high-temperature heating of the molten salt tank, and the hot water enters the heat exchanger to slowly heat the heat exchanger, thereby protecting the heat exchanger well. The molten salt heat storage system does not increase new equipment, and only through the reasonable layout of the pipeline, the preheating of the heat exchanger is realized, and the cost is greatly saved. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme of the embodiment of the present application, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0017] Figure 1 FIG. 1 is a schematic diagram of a molten salt heat storage system with preheating provided by the embodiment of the present application.
[0018] FIG. 1 is a schematic diagram of a molten salt heat storage system with preheating provided by the embodiment of the present application. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0020] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0021] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0022] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0023] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface" of second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature "under", "below" and "under surface" of second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature. Embodiment
[0024] The utility model embodiment provides a kind of molten salt heat storage system 100 with preheating function, refer to Figure 1 As shown in it includes deaerator 110, molten salt tank 120 and heat exchanger 130;The shell of molten salt tank 120 is provided with coil pipe 121, the liquid inlet end of coil pipe 121 is communicated with the liquid outlet end of deaerator 110, the liquid outlet end of coil pipe 121 is communicated with the cold side entrance of heat exchanger 130.Deaerator 110 output water passes through the shell of molten salt tank 120, and hot water is generated under the high-temperature heating of molten salt tank 120, and hot water enters heat exchanger 130 to preheat heat exchanger 130.Compared with directly in hot side pass in hot molten salt heating, the water temperature in the preheating process pipeline of the utility model slowly rises according to about 50 ℃ per hour temperature, slowly heats heat exchanger 130, until the water temperature in pipe reaches 100 ℃, when hot molten salt is passed in hot side again, the temperature difference of cold and hot sides is relatively small, so heat exchanger 130 is well protected.
[0025] Further, molten salt heat storage system 100 also includes steam header 140, and the steam inlet of steam header 140 is communicated with the cold side outlet of heat exchanger 130.Heat steam generated by heat exchanger 130 enters steam header 140 and is distributed.Steam header 140 is provided with first steam outlet 141, and first steam outlet 141 is communicated with the steam inlet of deaerator 110.Part of heat steam is transported to deaerator 110 and is used as steam source in deaeration process.Steam header 140 is also provided with second steam outlet 142, and second steam outlet 142 is communicated to thermal application unit.Another part of heat steam is transported to thermal application unit, and the energy of molten salt heat storage system 100 is outputted outside.First steam outlet 141 and second steam outlet 142 are provided with control valve, and the steam output can be adjusted.
[0026] As Figure 1As shown, the hot side inlet of the heat exchanger 130 is communicated with the molten salt outlet of the molten salt tank 120, and the hot side outlet of the heat exchanger 130 is communicated with the molten salt inlet of the molten salt tank 120. After the heat exchanger 130 completes the preheating process, hot molten salt can be input into the heat exchanger 130, and the hot molten salt is used to heat the water on the cold side to generate hot steam.
[0027] The deaerator 110 is provided with a liquid inlet pipe 111 and a vent pipe 112, the liquid inlet pipe 111 is communicated with external water, and the vent pipe 112 is communicated with external atmosphere. The liquid inlet pipe 111 is used to supplement the water amount of the system, and the vent pipe 112 is used to discharge steam.
[0028] Further, in other preferable embodiments of the utility model, the liquid outlet end of the deaerator 110 is further provided with a variable frequency feed water pump 113, and the liquid outlet end of the deaerator 110 is connected with the liquid inlet end of the coil pipe 121 through the variable frequency feed water pump 113. The variable frequency feed water pump 113 can adjust the rotating speed according to the heat exchange demand, so that the best heat exchange effect is achieved.
[0029] In summary, the utility model embodiment provides a molten salt heat storage system 100 with a preheating function, which comprises a deaerator 110, a molten salt tank 120 and a heat exchanger 130. The shell of the molten salt tank 120 is provided with a coil pipe 121, the liquid inlet end of the coil pipe 121 is communicated with the liquid outlet end of the deaerator 110, and the liquid outlet end of the coil pipe 121 is communicated with the cold side inlet of the heat exchanger 130. The water output from the deaerator 110 passes through the shell of the molten salt tank 120 and generates hot water under the high-temperature heating of the molten salt tank 120, and the hot water enters the heat exchanger 130 to slowly heat the heat exchanger 130, thereby protecting the heat exchanger 130 well. The molten salt heat storage system 100 does not increase new equipment, and only through the reasonable layout of the pipeline, the preheating of the heat exchanger 130 is realized, and the cost is greatly saved.
[0030] The above only describes preferred embodiments of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A molten salt heat storage system having a preheating function, characterized by, The molten salt heat storage system comprises a deaerator, a molten salt tank and a heat exchanger; a coil pipe is arranged in the shell of the molten salt tank, the inlet end of the coil pipe is communicated with the outlet end of the deaerator, and the outlet end of the coil pipe is communicated with the cold side inlet of the heat exchanger.
2. The molten salt thermal storage system of claim 1, wherein, The molten salt heat storage system further comprises a steam collecting header, and the steam inlet of the steam collecting header is communicated with the cold side outlet of the heat exchanger.
3. The molten salt thermal storage system of claim 2, wherein, The steam collecting header is provided with a first steam outlet, and the first steam outlet is communicated with the steam inlet of the deaerator.
4. The molten salt thermal storage system of claim 3, wherein, The steam collecting header is further provided with a second steam outlet, and the second steam outlet is communicated with a thermal application unit.
5. The molten salt thermal storage system of claim 4, wherein, The hot side inlet of the heat exchanger is communicated with the molten salt outlet of the molten salt tank, and the hot side outlet of the heat exchanger is communicated with the molten salt inlet of the molten salt tank.
6. The molten salt thermal storage system of claim 5, wherein, The deaerator is provided with a liquid inlet pipe and a vent pipe, the liquid inlet pipe is communicated with external water, and the vent pipe is communicated with external atmosphere.
7. The molten salt thermal storage system of claim 6, wherein, The outlet end of the deaerator is further provided with a variable frequency feed water pump, and the outlet end of the deaerator is connected with the inlet end of the coil pipe through the variable frequency feed water pump.