CN111238281A - Adjustable step phase change heat storage device and control method - Google Patents
Adjustable step phase change heat storage device and control method Download PDFInfo
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- CN111238281A CN111238281A CN202010065570.4A CN202010065570A CN111238281A CN 111238281 A CN111238281 A CN 111238281A CN 202010065570 A CN202010065570 A CN 202010065570A CN 111238281 A CN111238281 A CN 111238281A
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- 238000005338 heat storage Methods 0.000 title claims abstract description 229
- 230000008859 change Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 22
- 239000012782 phase change material Substances 0.000 claims description 41
- 239000013529 heat transfer fluid Substances 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 238000009825 accumulation Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XNDZQQSKSQTQQD-UHFFFAOYSA-N 3-methylcyclohex-2-en-1-ol Chemical compound CC1=CC(O)CCC1 XNDZQQSKSQTQQD-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- ZUDYPQRUOYEARG-UHFFFAOYSA-L barium(2+);dihydroxide;octahydrate Chemical compound O.O.O.O.O.O.O.O.[OH-].[OH-].[Ba+2] ZUDYPQRUOYEARG-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/028—Control arrangements therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses an adjustable step phase change heat storage device and a control method. By controlling the electromagnetic valve on the heat exchange pipeline, the on-off of the bypass pipeline can be realized, and the flow path of the fluid is further adjusted. The control method comprises a heat accumulation control method and a heat release control method. Taking a heat storage control method as an example, the working mode of the device is obtained, the inlet and the internal temperature of each stage of heat storage unit are adjusted, if the inlet temperature is higher than the internal temperature, the corresponding electromagnetic valve is adjusted and communicated with a bypass pipeline, and the fluid directly enters the inlet of the next heat storage unit; if the inlet temperature is lower than the internal temperature, the bypass pipeline is disconnected, and fluid enters the heat storage unit for heat exchange. The control method can effectively avoid reverse heat release of the heat storage unit in the heat storage process and reverse heat absorption of the heat storage unit in the heat release process, reduce energy loss in the heat storage/release process and improve the heat exchange efficiency and the energy utilization rate of the heat storage device.
Description
Technical Field
The invention relates to a step phase change heat storage device, in particular to an adjustable step phase change heat storage device.
Background
The phase change material is a functional material which absorbs or emits a large amount of latent heat at a specific temperature through a phase change of a substance. The phase-change heat storage is an energy storage technology for absorbing or releasing heat by utilizing the change of the physical state of a material, has the advantages of high energy storage density, small device volume, stable heat storage and release process and the like, and can store and release heatThe problem of unmatched supply and demand of energy utilization in time and space can be solved. However, most of the existing phase-change heat storage devices for heating are filled with only one phase-change material, and have poor heat exchange performance
The efficiency and energy utilization efficiency are low.
The multi-stage (step) phase change heat storage means that based on the principle of 'temperature to port and step utilization', the step heat storage and release are realized by arranging phase change materials with sequentially reduced melting points in the flowing direction of the heat transfer fluid. Compared with the single-stage phase change heat storage technology, the multi-stage phase change heat storage can obviously improve the energy storage device
The efficiency is improved, the heat storage and release time is shortened, the temperature of a heat transfer medium outlet is stable, and the energy utilization efficiency and the operation stability of the system are improved.
Chinese patent application No. 201710196922.8 discloses a modular cascade heat storage device based on phase change heat storage units and a method thereof, including a device body, a phase change heat storage unit stacking system and an input/output system. The phase change heat storage unit accumulation system comprises a plurality of phase change heat storage units which are distributed in the device body according to the high and low gradient of the melting point of the phase change material inside the device body. The flow of heat storage is that high-temperature fluid flows from the high-temperature phase change unit to the low-temperature phase change unit in sequence and finally flows out from the bottom of the device; the process of heat release is that high-temperature fluid flows out from the low-temperature phase change unit to the high-temperature phase change unit in sequence and finally flows out from the top of the device. The invention can store and release heat in a gradient way, and is easy for unit accumulation and system amplification. However, the device does not consider the influence of the temperature fluctuation of the heat transfer fluid inlet on the heat accumulation and release process, and is not beneficial to the flexible operation of the heating system.
Patent publication No. CN201410601801.3 discloses a cascade heat storage system and a cascade heat storage method. The cascade heat storage system comprises a solid heat storage heat exchanger, a phase-change heat storage heat exchanger, a molten salt steam superheater, a main pipeline and a side pipeline, and 6 heat storage heat exchanger combination modes are provided. However, the applicant does not give control logic for system switching of the heat storage and heat exchanger combination. In addition, the cascade heat storage system proposed by the applicant is mainly applied to large-scale solar power generation and industrial waste heat recovery, and is suitable for a low-temperature heating system.
A method and apparatus for charging a cascade heat storage system of patent application No. 201611102095.3. The system heat charging method comprises the steps of bypassing the heat storage devices which are completely charged by acquiring the heat charging states of all the stages of heat storage devices, and adjusting the outlet temperature of the upper stage of the heat storage devices which are not completely charged, so that the inlet temperature of the heat storage devices which are not completely charged is within the corresponding preset temperature threshold, the energy utilization rate of the cascade heat storage system is improved, and the service life of the heat storage devices is prolonged. However, the method and the device for charging the heat storage system in the cascade still have certain limitations in the application of the heating system, which are as follows: 1. the heat filling method is suitable for a system with heating equipment capable of flexibly adjusting the temperature. However, it cannot be used for systems in which temperature is difficult to adjust, such as solar heating and waste heat recovery. 2. Only the charging method is proposed and the discharging method is not considered. For a heating system, the tail end backwater of the heating system has certain temperature fluctuation, and the heat release process of the module is influenced. 3. The low-temperature heating system, especially the solar energy and air source heat pump system, has low water supply temperature and will not damage the low-temperature heat storage device, so the method can not prolong the service life of the heat storage device.
It can be seen from the above patent that the existing step heat storage device and the adjusting method are not complete enough, and a step heat storage device and a control method designed for a heating system are lacked, which is easy to cause ineffective heat storage and release. Take an air source heat pump heating system as an example. In the heat storage process, when severe cold weather occurs, in order to ensure the normal operation of the heat pump, operating personnel reduce the temperature of the water discharged by the heat pump. At this time, the temperature of the water at the inlet of a certain heat storage unit may be lower than the internal temperature thereof, so that the heat storage unit with the highest temperature reversely releases heat to the outlet water of the heat pump, and the heat storage amount is wasted. In the heat release process, because the heating load is relatively low in a certain period of time, the temperature of the tail end return water is increased, at the moment, the temperature of inlet water of a certain heat storage unit is higher than the temperature of the heat storage unit, the heat storage unit absorbs heat reversely, and the temperature of supplied water is reduced on the contrary. Under the conditions, part of the heat storage units are ineffective in storing and releasing heat, the heat exchange efficiency of the device is reduced, and the service life is influenced; but also makes the heating system operate inefficiently, causing energy waste.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an adjustable step phase change heat storage device which can be used for a heating system and can improve the heat exchange efficiency of the device and ensure the efficient operation of the system and a control method.
The invention relates to an adjustable step phase change heat storage device, which comprises an inner shell and an outer shell sleeved outside the inner shell at intervals, wherein heat insulation materials are filled between the inner shell and the outer shell, an upper cover plate is covered on the top wall of the outer shell, two partition plates are fixed in the inner shell at intervals along the left and right direction in the vertical direction to divide the inner shell into a first chamber, a second chamber and a third chamber which are independent of each other, a first-stage phase change material is filled in the first chamber to form a first-stage heat storage unit, a second-stage phase change material is filled in the second chamber to form a second-stage heat storage unit, a third-stage phase change material is filled in the third chamber to form a third-stage heat storage unit, and a first-stage heat exchange coil pipe, a second-stage heat exchange coil pipe and a third-stage phase change material are respectively arranged in the first, The heat storage unit comprises a first-stage heat exchange coil, a second-stage heat exchange coil and a third-stage heat exchange coil, wherein the inlet and outlet ends of the first-stage heat exchange coil, the second-stage heat exchange coil and the third-stage heat exchange coil are respectively connected with a valve and are respectively arranged outside an upper cover plate, the inlet and outlet ends of the first-stage heat exchange coil, the second-stage heat exchange coil and the third-stage heat exchange coil are respectively communicated with a main pipe, a plurality of temperature sensors are respectively and uniformly arranged inside a first-stage phase-change material, a second-stage phase-change material and a third-stage phase-change material, a plurality of temperature sensors are arranged on the main pipe, the temperature sensors at the main pipe are respectively arranged at the inlet and outlet ends of the first-stage heat exchange coil, the second-stage heat exchange coil and the third-stage heat exchange coil and are used for testing the inlet temperature of each heat storage, the valves at the inlet end and the outlet end of the second-stage heat exchange coil are respectively a fourth valve and a sixth valve, the valves at the inlet end and the outlet end of the third-stage heat exchange coil are respectively a seventh valve and a ninth valve, the second valve is arranged on the trunk pipe between the inlet end and the outlet end of the first-stage heat exchange coil and the joint of the trunk pipe, the fifth valve is arranged on the trunk pipe between the inlet end and the outlet end of the second-stage heat exchange coil and the joint of the trunk pipe, and the eighth valve is arranged on the trunk pipe between the inlet end and the outlet end of the third-stage heat exchange coil and the joint of the trunk pipe;
the phase change temperature relation of the phase change materials is filled in each stage of heat storage units, and the phase change temperature of the first-stage phase change material is greater than the phase change temperature of the second-stage phase change material and greater than the phase change temperature of the third-stage phase change material.
The invention relates to a control method of an adjustable step phase change heat storage device, which comprises the following steps:
step S203: in the heat storage mode, the high-temperature heat transfer fluid flows in the direction in which the phase change temperature decreases step by step, and step S204 is executed; in the heat release mode, the low-temperature heat transfer fluid flows along the direction of gradually increasing the phase change temperature, and step S214 is executed;
step S204: respectively acquiring the inlet temperature and the internal temperature of each stage of heat storage unit in the heat storage process through the temperature sensors in each stage of heat storage unit and the plurality of temperature sensors arranged on the main pipe, taking the arithmetic mean value of the temperature values of the temperature sensors in each heat storage unit as the internal temperature of each stage of heat storage unit, and executing step S205;
step S205: judging whether the inlet temperature of the first-stage heat storage unit is higher than the internal temperature of the first-stage heat storage unit; if the temperature is higher than the internal temperature of the first-stage heat storage unit, step S207 is executed; otherwise, executing step S206;
step S206: closing the first valve and the third valve, opening the second valve, bypassing the first-stage heat storage unit, and allowing the heat transfer medium to directly pass through the second valve, and executing the step S208;
step S207: opening the first valve and the third valve, closing the second valve, disconnecting the bypass pipeline corresponding to the first-stage heat storage unit, allowing the heat transfer medium to enter the first-stage heat exchange coil for heat exchange, and executing the step S208;
step S208: judging whether the inlet temperature of the second-stage heat storage unit is higher than the internal temperature of the second-stage heat storage unit; if the temperature is higher than the internal temperature of the second-stage heat storage unit, step S210 is executed; otherwise, executing step S209;
step S209: closing the fourth valve and the sixth valve, opening the fifth valve, bypassing the second-stage heat storage unit, and directly passing the heat transfer medium through the fifth valve, and executing the step S211;
step S210: opening the fourth valve and the sixth valve, closing the fifth valve, disconnecting the bypass pipeline corresponding to the second-stage heat storage unit, allowing the heat transfer medium to enter the second-stage heat exchange coil for heat exchange, and executing the step S211;
step S211: judging whether the inlet temperature of the third-stage heat storage unit is higher than the internal temperature of the third-stage heat storage unit or not; if the temperature is higher than the internal temperature of the third-stage heat storage unit, step S213 is executed; otherwise, executing step S212;
step S212: closing the seventh valve and the ninth valve, opening the eighth valve, bypassing the third-stage heat storage unit, and directly allowing the heat transfer medium to flow out of the step phase-change heat storage device through the eighth valve;
step S213: opening the seventh valve and the ninth valve, closing the eighth valve, disconnecting a bypass pipeline corresponding to the third-stage heat storage unit, allowing the heat transfer medium to enter the third-stage heat exchange coil for heat exchange, and then flowing out of the step phase change heat storage device;
step S214: respectively acquiring the inlet temperature and the internal temperature of each stage of heat storage unit in the heat release process through the temperature sensors in each stage of heat storage unit and a plurality of temperature sensors arranged on the main pipe, taking the arithmetic mean value of the temperature values of the temperature sensors in each heat storage unit as the internal temperature of each stage of heat storage unit, and executing step S215;
step S215: judging whether the inlet temperature of the third-stage heat storage unit is lower than the internal temperature of the third-stage heat storage unit or not; if the temperature is lower than the internal temperature of the third-stage heat storage unit, executing step S217; otherwise, executing step S216;
step S216: closing the seventh valve and the ninth valve, opening the eighth valve, bypassing the third-stage heat storage unit, and directly passing the heat transfer medium through the eighth valve, and performing step S218;
step S217: opening the seventh valve and the ninth valve, closing the eighth valve, disconnecting the bypass pipeline corresponding to the third-stage heat storage unit, allowing the heat transfer medium to enter the third-stage heat exchange coil for heat exchange, and executing step S218;
step S218: judging whether the inlet temperature of the second-stage heat storage unit is lower than the internal temperature of the second-stage heat storage unit or not; if the temperature is lower than the internal temperature of the second-stage heat storage unit, step S220 is executed; otherwise, executing step S219;
step S219: closing the fourth valve and the sixth valve, opening the fifth valve, bypassing the second-stage heat storage unit, and directly passing the heat transfer medium through the fifth valve, and executing the step S221;
step S220: opening the fourth valve and the sixth valve, closing the fifth valve, disconnecting the bypass pipeline corresponding to the second-stage heat storage unit, allowing the heat transfer medium to enter the second-stage heat exchange coil for heat exchange, and executing the step S221;
step S221: judging whether the inlet temperature of the first-stage heat storage unit is lower than the internal temperature of the first-stage heat storage unit or not; if the temperature is higher than the internal temperature of the first-stage heat storage unit, executing step S223; otherwise, executing step S222;
step S222: closing the first valve and the third valve, opening the second valve, bypassing the first-stage heat storage unit, and allowing the heat transfer medium to directly flow out of the step phase-change heat storage device through the second valve;
step S223: and opening the first valve and the third valve, closing the second valve, disconnecting the bypass pipeline corresponding to the first-stage heat storage unit, allowing the heat transfer medium to enter the first-stage heat exchange coil for heat exchange, and allowing the heat transfer medium to flow out of the step phase-change heat storage device.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with a single-stage phase change heat storage device, the step phase change heat storage deviceThe heat storage and release speed is high,
high efficiency, more stable heat accumulation and release process and the like.
2. The provided step heat storage device and the control method can adjust the heat storage unit according to the water outlet temperature and the tail end return water temperature of the heat source, prevent the heat storage unit from reversely releasing heat in the heat storage process, prevent the heat storage unit from reversely absorbing heat in the heat release process, reduce the energy loss in the heat storage/release process and improve the heat exchange efficiency of the heat storage device.
3. The cascade heat storage device and the control method can be suitable for various heating systems, and can flexibly control the heat storage units participating in the heat storage/release process according to the operation change of the heating system, so as to adjust the heat storage/release amount of the system, and are beneficial to the efficient and stable operation of the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, the drawings in the following description are only one embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of the step phase change heat storage device of the present invention.
Detailed Description
The invention is described in detail below with reference to specific embodiments and the attached drawings.
As shown in figure 1, the adjustable step phase change heat storage device comprises an inner shell 3 and an outer shell 1 sleeved outside the inner shell at intervals, wherein a heat insulation material 2 is filled between the inner shell 3 and the outer shell 1, an upper cover plate 6 is covered on the top wall of the outer shell 1, two partition plates are fixed in the inner shell 3 at intervals along the vertical direction to divide the inner shell 3 into a first chamber, a second chamber and a third chamber which are independent of each other, a first-stage phase change material 5 is filled in the first chamber to form a first-stage heat storage unit, a second-stage phase change material 11 is filled in the second chamber to form a second-stage heat storage unit, a third-stage phase change material 9 is filled in the third chamber to form a third-stage heat storage unit, and a first-stage heat exchange coil 4, a second-stage heat exchange coil 4, a third-stage heat exchange coil 9 and a third-stage heat exchange coil 9 are, The second-stage heat exchange coil and the third-stage heat exchange coil. The inlet and outlet ends of the first-stage heat exchange coil 4, the second-stage heat exchange coil and the third-stage heat exchange coil are connected with valves and are arranged outside the upper cover plate 6, and the inlet and outlet ends of the first-stage heat exchange coil 4, the second-stage heat exchange coil and the third-stage heat exchange coil are communicated with a trunk pipe 8. A plurality of temperature sensors 7 are uniformly arranged in the first-stage phase-change material 5, the second-stage phase-change material 11 and the third-stage phase-change material 9 respectively, and there may be 9 sensors as shown in the figure. The main pipe 8 is provided with a plurality of temperature sensors, and the temperature sensors at the main pipe are respectively arranged at the inlet and outlet ends of the first-stage heat exchange coil 4, the second-stage heat exchange coil and the third-stage heat exchange coil and are used for testing the inlet temperature of each heat storage unit. The valves at the inlet end and the outlet end of the first-stage heat exchange coil 4 are respectively a first valve F1 and a third valve F3, the valves at the inlet end and the outlet end of the second-stage heat exchange coil are respectively a fourth valve F4 and a sixth valve F6, the valves at the inlet end and the outlet end of the third stage heat exchange coil are respectively a seventh valve F7 and a ninth valve F9, a second valve F2 is arranged on the main pipe 8 between the inlet end and the outlet end of the first-stage heat exchange coil 4 and the joint of the main pipe 8, a fifth valve F5 is arranged on the main pipe 8 between the joints of the inlet end and the outlet end of the second-stage heat exchange coil and the main pipe 8 respectively, and an eighth valve F8 is arranged on the main pipe 8 between the connection positions of the inlet end and the outlet end of the third-stage heat exchange coil and the main pipe 8 respectively.
The phase change temperature relation of the phase change materials is filled in each stage of heat storage units, and the phase change temperature of the first-stage phase change material 5 is greater than the phase change temperature of the second-stage phase change material 11 and greater than the phase change temperature of the third-stage phase change material 9. For example, in an electric boiler multi-stage heat storage and heating system, for example, in an electric boiler cascade heat storage and heating system, barium hydroxide octahydrate with the phase change temperature of 78 ℃ can be used as the first-stage phase change material 5, aluminum nitrate nonahydrate with the phase change temperature of 73 ℃ can be used as the second-stage phase change material 11, and stearic acid with the phase change temperature of 67-69 ℃ can be used as the third-stage phase change material 9.
Two ports of the main pipe 8 of the device can be connected with water supply pipelines of systems such as heating systems, and whether the heat storage process or the heat release process is carried out is determined according to the requirements of the heating systems.
The invention discloses a control method of an adjustable step phase change heat storage device, which comprises the following steps:
step S203: in the heat storage mode, the high-temperature heat transfer fluid flows in the direction in which the phase change temperature decreases step by step, and step S204 is executed; in the heat release mode, the low-temperature heat transfer fluid flows along the direction of gradually increasing the phase change temperature, and step S214 is executed;
step S204: the inlet temperature and the internal temperature of each stage of heat storage unit in the heat storage process are respectively obtained through the temperature sensors in each stage of heat storage unit and the plurality of temperature sensors mounted on the trunk pipe 8, the arithmetic mean value of the temperature values of the temperature sensors in each heat storage unit is taken as the internal temperature of each stage of heat storage unit, and step S205 is executed.
Step S205: and judging whether the inlet temperature of the first-stage heat storage unit is higher than the internal temperature of the first-stage heat storage unit. If the temperature is higher than the internal temperature of the first-stage heat storage unit, step S207 is executed; otherwise, step S206 is executed.
Step S206: the first valve F1 and the third valve F3 are closed, the second valve F2 is opened, the first stage heat storage unit is bypassed, the heat transfer medium passes directly through the second valve, and step S208 is performed.
Step S207: and opening the first valve F1 and the third valve F3, closing the second valve F2, disconnecting the bypass pipeline corresponding to the first-stage heat storage unit, allowing the heat transfer medium to enter the first-stage heat exchange coil for heat exchange, and executing the step S208.
Step S208: and judging whether the inlet temperature of the second-stage heat storage unit is higher than the internal temperature of the second-stage heat storage unit. If the temperature is higher than the internal temperature of the second-stage heat storage unit, step S210 is executed; otherwise, step S209 is performed.
Step S209: the fourth valve F4 and the sixth valve F6 are closed, the fifth valve F5 is opened, the second stage heat storage unit is bypassed, the heat transfer medium passes through the fifth valve directly, and step S211 is executed.
Step S210: and opening a fourth valve F4 and a sixth valve F6, closing a fifth valve F5, disconnecting a bypass pipeline corresponding to the second-stage heat storage unit, allowing the heat transfer medium to enter the second-stage heat exchange coil for heat exchange, and executing the step S211.
Step S211: and judging whether the inlet temperature of the third-stage heat storage unit is higher than the internal temperature of the third-stage heat storage unit. If the temperature is higher than the internal temperature of the third-stage heat storage unit, step S213 is executed; otherwise, step S212 is executed.
Step S212: and closing the seventh valve F7 and the ninth valve F9, opening the eighth valve F8, bypassing the third-stage heat storage unit, and directly flowing the heat transfer medium out of the step phase-change heat storage device through the eighth valve.
Step S213: and opening a seventh valve F7 and a ninth valve F9, closing an eighth valve F8, disconnecting a bypass pipeline corresponding to the third-stage heat storage unit, and allowing a heat transfer medium to enter the third-stage heat exchange coil for heat exchange and then flow out of the step phase change heat storage device.
Step S214: the inlet temperature and the internal temperature of each stage of heat storage unit in the heat release process are respectively obtained through the temperature sensors in each stage of heat storage unit and the plurality of temperature sensors mounted on the trunk pipe 8, the arithmetic mean value of the temperature values of the temperature sensors in each heat storage unit is taken as the internal temperature of each stage of heat storage unit, and step S215 is executed.
Step S215: and judging whether the inlet temperature of the third-stage heat storage unit is lower than the internal temperature of the third-stage heat storage unit. If the temperature is lower than the internal temperature of the third-stage heat storage unit, executing step S217; otherwise, step S216 is executed.
Step S216: the seventh valve F7 and the ninth valve F9 are closed, the eighth valve F8 is opened, the third stage heat storage unit is bypassed, the heat transfer medium passes through the eighth valve directly, and step S218 is performed.
Step S217: and opening a seventh valve F7 and a ninth valve F9, closing an eighth valve F8, disconnecting a bypass pipeline corresponding to the third-stage heat storage unit, allowing the heat transfer medium to enter the third-stage heat exchange coil for heat exchange, and executing the step S218.
Step S218: and judging whether the inlet temperature of the second-stage heat storage unit is lower than the internal temperature of the second-stage heat storage unit. If the temperature is lower than the internal temperature of the second-stage heat storage unit, step S220 is executed; otherwise, step S219 is performed.
Step S219: the fourth valve F4 and the sixth valve F6 are closed, the fifth valve F5 is opened, the second stage heat storage unit is bypassed, the heat transfer medium passes through the fifth valve directly, and step S221 is performed.
Step S220: and opening a fourth valve F4 and a sixth valve F6, closing a fifth valve F5, disconnecting a bypass pipeline corresponding to the second-stage heat storage unit, allowing the heat transfer medium to enter the second-stage heat exchange coil for heat exchange, and executing the step S221.
Step S221: and judging whether the inlet temperature of the first-stage heat storage unit is lower than the internal temperature of the first-stage heat storage unit. If the temperature is higher than the internal temperature of the first-stage heat storage unit, executing step S223; otherwise, step S222 is executed.
Step S222: the first valve F1 and the third valve F3 are closed, the second valve F2 is opened, the first-stage heat storage unit is bypassed, and the heat transfer medium directly flows out of the step phase-change heat storage device through the second valve.
Step S223: and opening the first valve F1 and the third valve F3, closing the second valve F2, disconnecting the bypass pipeline corresponding to the first-stage heat storage unit, and allowing the heat transfer medium to enter the first-stage heat exchange coil for heat exchange and then flow out of the step phase change heat storage device.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (2)
1. The utility model provides a step phase transition heat-retaining device with adjustable, includes that interior casing and interval cover are at the outer shell body of inner shell body interior casing and shell body between pack and have heat preservation and insulation material outer shell body roof on be stamped upper cover plate, its characterized in that: the inner shell is divided into a first cavity, a second cavity and a third cavity which are independent from each other by two partition plates fixed at left and right intervals along the vertical direction, a first-stage phase-change material is filled in the first cavity to form a first-stage heat storage unit, a second-stage phase-change material is filled in the second cavity to form a second-stage heat storage unit, a third-stage phase-change material is filled in the third cavity to form a third-stage heat storage unit, a first-stage heat exchange coil, a second-stage heat exchange coil and a third-stage heat exchange coil are respectively arranged in the first-stage phase-change material, the second-stage phase-change material and the third-stage phase-change material, inlet and outlet ends of the first-stage heat exchange coil, the second-stage heat exchange coil and the third-stage heat exchange coil are respectively connected with valves and are arranged outside the upper cover plate, the first-stage, The inlet and outlet ends of the second-stage heat exchange coil and the third-stage heat exchange coil are respectively communicated with a main pipe, a plurality of temperature sensors are respectively and uniformly arranged in the first-stage phase-change material, the second-stage phase-change material and the third-stage phase-change material, the main pipe is provided with a plurality of temperature sensors, the temperature sensors at the main pipe are respectively arranged at the inlet and outlet ends of the first-stage heat exchange coil, the second-stage heat exchange coil and the third-stage heat exchange coil and are used for testing the inlet temperature of each heat storage unit, the valves at the inlet end and the outlet end of the first-stage heat exchange coil are respectively a first valve and a third valve, the valves at the inlet end and the outlet end of the second-stage heat exchange coil are respectively a fourth valve and a sixth valve, and the valves at the inlet end and the outlet end of the third-stage heat exchange coil are respectively a seventh valve and a, a second valve is arranged on the main pipe between the connection parts of the inlet end and the outlet end of the first-stage heat exchange coil and the main pipe respectively, a fifth valve is arranged on the main pipe between the connection parts of the inlet end and the outlet end of the second-stage heat exchange coil and the main pipe respectively, and an eighth valve is arranged on the main pipe between the connection parts of the inlet end and the outlet end of the third-stage heat exchange coil and the main pipe respectively;
the phase change temperature relation of the phase change materials is filled in each stage of heat storage units, and the phase change temperature of the first-stage phase change material is greater than the phase change temperature of the second-stage phase change material and greater than the phase change temperature of the third-stage phase change material.
2. A control method of an adjustable step phase change heat storage device is characterized by comprising the following steps:
step S203: in the heat storage mode, the high-temperature heat transfer fluid flows in the direction in which the phase change temperature decreases step by step, and step S204 is executed; in the heat release mode, the low-temperature heat transfer fluid flows along the direction of gradually increasing the phase change temperature, and step S214 is executed;
step S204: respectively acquiring the inlet temperature and the internal temperature of each stage of heat storage unit in the heat storage process through the temperature sensors in each stage of heat storage unit and the plurality of temperature sensors arranged on the main pipe, taking the arithmetic mean value of the temperature values of the temperature sensors in each heat storage unit as the internal temperature of each stage of heat storage unit, and executing step S205;
step S205: judging whether the inlet temperature of the first-stage heat storage unit is higher than the internal temperature of the first-stage heat storage unit; if the temperature is higher than the internal temperature of the first-stage heat storage unit, step S207 is executed; otherwise, executing step S206;
step S206: closing the first valve and the third valve, opening the second valve, bypassing the first-stage heat storage unit, and allowing the heat transfer medium to directly pass through the second valve, and executing the step S208;
step S207: opening the first valve and the third valve, closing the second valve, disconnecting the bypass pipeline corresponding to the first-stage heat storage unit, allowing the heat transfer medium to enter the first-stage heat exchange coil for heat exchange, and executing the step S208;
step S208: judging whether the inlet temperature of the second-stage heat storage unit is higher than the internal temperature of the second-stage heat storage unit; if the temperature is higher than the internal temperature of the second-stage heat storage unit, step S210 is executed; otherwise, executing step S209;
step S209: closing the fourth valve and the sixth valve, opening the fifth valve, bypassing the second-stage heat storage unit, and directly passing the heat transfer medium through the fifth valve, and executing the step S211;
step S210: opening the fourth valve and the sixth valve, closing the fifth valve, disconnecting the bypass pipeline corresponding to the second-stage heat storage unit, allowing the heat transfer medium to enter the second-stage heat exchange coil for heat exchange, and executing the step S211;
step S211: judging whether the inlet temperature of the third-stage heat storage unit is higher than the internal temperature of the third-stage heat storage unit or not; if the temperature is higher than the internal temperature of the third-stage heat storage unit, step S213 is executed; otherwise, executing step S212;
step S212: closing the seventh valve and the ninth valve, opening the eighth valve, bypassing the third-stage heat storage unit, and directly allowing the heat transfer medium to flow out of the step phase-change heat storage device through the eighth valve;
step S213: opening the seventh valve and the ninth valve, closing the eighth valve, disconnecting a bypass pipeline corresponding to the third-stage heat storage unit, allowing the heat transfer medium to enter the third-stage heat exchange coil for heat exchange, and then flowing out of the step phase change heat storage device;
step S214: respectively acquiring the inlet temperature and the internal temperature of each stage of heat storage unit in the heat release process through the temperature sensors in each stage of heat storage unit and a plurality of temperature sensors arranged on the main pipe, taking the arithmetic mean value of the temperature values of the temperature sensors in each heat storage unit as the internal temperature of each stage of heat storage unit, and executing step S215;
step S215: judging whether the inlet temperature of the third-stage heat storage unit is lower than the internal temperature of the third-stage heat storage unit or not; if the temperature is lower than the internal temperature of the third-stage heat storage unit, executing step S217; otherwise, executing step S216;
step S216: closing the seventh valve and the ninth valve, opening the eighth valve, bypassing the third-stage heat storage unit, and directly passing the heat transfer medium through the eighth valve, and performing step S218;
step S217: opening the seventh valve and the ninth valve, closing the eighth valve, disconnecting the bypass pipeline corresponding to the third-stage heat storage unit, allowing the heat transfer medium to enter the third-stage heat exchange coil for heat exchange, and executing step S218;
step S218: judging whether the inlet temperature of the second-stage heat storage unit is lower than the internal temperature of the second-stage heat storage unit or not; if the temperature is lower than the internal temperature of the second-stage heat storage unit, step S220 is executed; otherwise, executing step S219;
step S219: closing the fourth valve and the sixth valve, opening the fifth valve, bypassing the second-stage heat storage unit, and directly passing the heat transfer medium through the fifth valve, and executing the step S221;
step S220: opening the fourth valve and the sixth valve, closing the fifth valve, disconnecting the bypass pipeline corresponding to the second-stage heat storage unit, allowing the heat transfer medium to enter the second-stage heat exchange coil for heat exchange, and executing the step S221;
step S221: judging whether the inlet temperature of the first-stage heat storage unit is lower than the internal temperature of the first-stage heat storage unit or not; if the temperature is higher than the internal temperature of the first-stage heat storage unit, executing step S223; otherwise, executing step S222;
step S222: closing the first valve and the third valve, opening the second valve, bypassing the first-stage heat storage unit, and allowing the heat transfer medium to directly flow out of the step phase-change heat storage device through the second valve;
step S223: and opening the first valve and the third valve, closing the second valve, disconnecting the bypass pipeline corresponding to the first-stage heat storage unit, allowing the heat transfer medium to enter the first-stage heat exchange coil for heat exchange, and allowing the heat transfer medium to flow out of the step phase-change heat storage device.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418301A (en) * | 2021-06-30 | 2021-09-21 | 思安新能源股份有限公司 | Modularized heat storage device |
| CN114322046A (en) * | 2021-12-10 | 2022-04-12 | 中国华能集团清洁能源技术研究院有限公司 | Heating device and heat storage method of step heat storage electric boiler |
| CN114812246A (en) * | 2022-04-19 | 2022-07-29 | 浙江大学 | Cascade heat utilization system in unsteady state heat storage and release process and control method thereof |
| CN116576707A (en) * | 2023-05-19 | 2023-08-11 | 清华大学 | Design method, device, equipment, medium and system of gradient phase-change heat storage system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201313051D0 (en) * | 2013-07-22 | 2013-09-04 | Isentropic Ltd | Thermal storage apparatus for rapid cycling applications |
| CN203518746U (en) * | 2013-10-10 | 2014-04-02 | 袁艳平 | Multi-grade heat recovery phase change heat accumulator |
| CN105627799A (en) * | 2014-10-31 | 2016-06-01 | 中广核太阳能开发有限公司 | Stepped heat storage system and stepped heat storage method |
| CN107062974A (en) * | 2017-05-31 | 2017-08-18 | 青岛奥环新能源集团有限公司 | Efficient heat energy step storage device |
| CN207797837U (en) * | 2018-01-23 | 2018-08-31 | 北京国能中电节能环保技术股份有限公司 | Multi-level phase change heat-storing device |
| CN109764734A (en) * | 2019-02-14 | 2019-05-17 | 西安交通大学 | A kind of complementary regenerative apparatus of multistage and method |
| NO20171937A1 (en) * | 2017-12-05 | 2019-06-06 | Energynest As | Modular thermal energy storage system, improved method of operation of such systems and use of the thermal energy storage system |
| CN109915885A (en) * | 2019-03-26 | 2019-06-21 | 沈阳世杰电器有限公司 | Heating system of the heat supply network user terminal with thermal energy storage device |
| CN110529870A (en) * | 2019-09-23 | 2019-12-03 | 高黎明 | A kind of recycling of cigarette air supply heat pump waste heat and flue gas take off the white integrated heating system heated with paddy electricity phase-change accumulation energy step |
| CN212227829U (en) * | 2020-01-20 | 2020-12-25 | 天津大学 | Adjustable step phase change heat storage device |
-
2020
- 2020-01-20 CN CN202010065570.4A patent/CN111238281A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201313051D0 (en) * | 2013-07-22 | 2013-09-04 | Isentropic Ltd | Thermal storage apparatus for rapid cycling applications |
| CN203518746U (en) * | 2013-10-10 | 2014-04-02 | 袁艳平 | Multi-grade heat recovery phase change heat accumulator |
| CN105627799A (en) * | 2014-10-31 | 2016-06-01 | 中广核太阳能开发有限公司 | Stepped heat storage system and stepped heat storage method |
| CN107062974A (en) * | 2017-05-31 | 2017-08-18 | 青岛奥环新能源集团有限公司 | Efficient heat energy step storage device |
| NO20171937A1 (en) * | 2017-12-05 | 2019-06-06 | Energynest As | Modular thermal energy storage system, improved method of operation of such systems and use of the thermal energy storage system |
| CN207797837U (en) * | 2018-01-23 | 2018-08-31 | 北京国能中电节能环保技术股份有限公司 | Multi-level phase change heat-storing device |
| CN109764734A (en) * | 2019-02-14 | 2019-05-17 | 西安交通大学 | A kind of complementary regenerative apparatus of multistage and method |
| CN109915885A (en) * | 2019-03-26 | 2019-06-21 | 沈阳世杰电器有限公司 | Heating system of the heat supply network user terminal with thermal energy storage device |
| CN110529870A (en) * | 2019-09-23 | 2019-12-03 | 高黎明 | A kind of recycling of cigarette air supply heat pump waste heat and flue gas take off the white integrated heating system heated with paddy electricity phase-change accumulation energy step |
| CN212227829U (en) * | 2020-01-20 | 2020-12-25 | 天津大学 | Adjustable step phase change heat storage device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418301A (en) * | 2021-06-30 | 2021-09-21 | 思安新能源股份有限公司 | Modularized heat storage device |
| CN114322046A (en) * | 2021-12-10 | 2022-04-12 | 中国华能集团清洁能源技术研究院有限公司 | Heating device and heat storage method of step heat storage electric boiler |
| CN114812246A (en) * | 2022-04-19 | 2022-07-29 | 浙江大学 | Cascade heat utilization system in unsteady state heat storage and release process and control method thereof |
| CN116576707A (en) * | 2023-05-19 | 2023-08-11 | 清华大学 | Design method, device, equipment, medium and system of gradient phase-change heat storage system |
| CN116576707B (en) * | 2023-05-19 | 2023-10-27 | 清华大学 | Design method, device, equipment, medium and system of gradient phase-change heat storage system |
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