CN111748322A - System device and method for batch automatic production of phase-change heat storage material - Google Patents
System device and method for batch automatic production of phase-change heat storage material Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 74
- 239000011232 storage material Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 103
- 238000002156 mixing Methods 0.000 claims abstract description 72
- 238000003860 storage Methods 0.000 claims abstract description 68
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 84
- 239000002994 raw material Substances 0.000 claims description 75
- 238000003756 stirring Methods 0.000 claims description 57
- MFUVDXOKPBAHMC-UHFFFAOYSA-N magnesium;dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MFUVDXOKPBAHMC-UHFFFAOYSA-N 0.000 claims description 44
- 230000008859 change Effects 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 29
- 239000011257 shell material Substances 0.000 claims description 23
- 238000007599 discharging Methods 0.000 claims description 22
- 239000000374 eutectic mixture Substances 0.000 claims description 12
- 230000003993 interaction Effects 0.000 claims description 12
- 239000002562 thickening agent Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 9
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 9
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000011231 conductive filler Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000010923 batch production Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000002609 medium Substances 0.000 description 31
- 239000012782 phase change material Substances 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 5
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012526 feed medium Substances 0.000 description 3
- 238000011031 large-scale manufacturing process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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Abstract
The invention provides a system device and a method for automatically producing phase-change heat storage materials in batches, wherein the system device comprises a storage unit, a mixing unit, a reaction unit and a collection unit which are sequentially connected; the system device also comprises a feeding unit, the feeding unit comprises a first feeding device and a second feeding device, the two ends of the first feeding device are respectively butted with the storage unit and the mixing unit, and the two ends of the second feeding device are respectively butted with the mixing unit and the reaction unit. The invention provides a production system suitable for automatic and large-scale preparation of a phase-change heat storage material, and is particularly suitable for batch production of crystalline hydrated salt phase-change heat storage materials, aiming at the problems of small scale, non-automation and the like of the production system of the phase-change heat storage material in the prior art.
Description
Technical Field
The invention belongs to the technical field of phase change heat storage material production, relates to a system device and a method for phase change heat storage materials, and particularly relates to a system device and a method for batch automatic production of phase change heat storage materials.
Background
The phase change material utilizes the latent heat of phase change to store and release energy. The phase-change material stores and releases energy through heat absorption and heat release in the phase-change process, so that the purpose of controlling the ambient temperature is achieved. Because the energy storage density is high and the temperature is approximate to constant in the phase change process, the phase change material has wide application prospect in the fields of building energy conservation, solar energy, power grid peak clipping and valley filling, aerospace, articles for daily use and the like. Once the material is widely applied to human life, the material becomes an optimal green environment-friendly carrier for energy conservation and environmental protection, and is listed as a national research and development utilization sequence in China; with the successful development of a new processing technology, a new processing and production method is needed to meet the technological requirements so as to meet the requirement of large-scale and large-batch production of the phase-change material on the premise of safety and reliability.
CN107824064A discloses an automatic preparation device for composite heat storage material, which comprises a negative pressure conveying and batching system, a mixing system, a packaging system and an electric control system. The electric control system controls the negative pressure conveying and proportioning system and controls the automatic operation of each system according to the raw material proportion so as to realize the automatic and continuous compounding of the composite heat storage material. However, the temperature control and mixing conditions during the mixing process are not controllable, and the problem of insufficient or excessive reaction exists.
CN107244006A discloses a phase change material processing production line, which comprises a solid raw material system, a liquid raw material system, a mixing system and a post-treatment system. Can be completely mixed under the condition that the ratio of liquid raw materials to solid raw materials is close to 1:1, and can be made into qualified products, and can realize continuous, automatic and batch production under the condition that the raw materials are stably supplied and transported. The main body of the mixing system is at least one screw extruder, so the equipment cost and investment of the invention are high, and the invention is not beneficial to large-scale production.
CN104559937A discloses a production apparatus of energy storage agent of energy-saving phase-change material, which comprises a heat storage device, a mixer and an extruder. The phase-change material heat reservoir which converts solar energy into heat energy for storage and release is connected with the mixer and the extruder through the circulating system for heat exchange, and has the advantages of energy conservation, easy production, good stability of the produced phase-change material and the like. However, the solar heat collector needs a large floor space, the production scale is difficult, and the invention has no automatic production capability.
The production equipment for the phase-change energy storage material cannot effectively solve the problems of automatic temperature control, large-scale production and automation. Therefore, how to ensure the automation of the production process and a large-scale production method under the condition of ensuring the quality of the phase change energy storage material becomes a problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system device and a method for phase-change heat storage materials. In addition, through set up the mixing unit at reaction unit's technology upper reaches, carry out the premixing to the raw materials, further shortened the mixing time in the reaction unit, promoted the mixed effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a system device for batch automatic production of phase-change heat storage materials,
the system device comprises a material storage unit, a mixing unit, a reaction unit and a collection unit which are sequentially connected along the material flow direction.
The system device also comprises a feeding unit, the feeding unit comprises a first feeding device and a second feeding device, the two ends of the first feeding device are respectively butted with the storage unit and the mixing unit, and the two ends of the second feeding device are respectively butted with the mixing unit and the reaction unit.
The system device provided by the invention improves the production continuity of the phase change heat storage material by arranging the feeding unit, and lays an equipment foundation for the automation and scale production of the phase change heat storage material. In addition, through set up the mixing unit at reaction unit's technology upper reaches, carry out the premixing to the raw materials, further shortened the mixing time in the reaction unit, promoted the mixed effect.
As a preferred technical solution of the present invention, the storage unit includes a storage bin.
Preferably, the first feeding device and the second feeding device are both material lifting machines.
As a preferred technical solution of the present invention, the mixing unit includes a mixing device and a buffer tank, and the buffer tank is located below the mixing device and is used for receiving the mixed material discharged from the discharge port at the bottom of the mixing device.
Preferably, a top feeding port of the mixing device is in butt joint with a discharging end of the first feeding device through a first feeding medium pipe, raw materials stored in the bin are lifted by the first feeding medium pipe and are sent into the mixing device through the first feeding device, and a discharging port of the buffer storage tank is connected with a feeding end of the second feeding device.
Preferably, a valve is arranged at a discharge port at the bottom of the mixing device.
Preferably, the valve is an electric valve or an electromagnetic valve.
Preferably, the mixing device is a horizontal mixer.
Preferably, the inner wall of the mixing device, the feeding end of the mixing device, the discharging end of the mixing device and the buffer storage tank are all subjected to anti-corrosion treatment.
Preferably, the shell material of mixing arrangement and the shell material of buffer tank be stainless steel.
As a preferable technical scheme, the reaction unit comprises a reaction device and a stirring assembly, wherein the stirring assembly comprises a stirring device positioned in a shell of the reaction device and an external motor in transmission connection with the top of the stirring device.
Preferably, a heating device is arranged inside the reaction device shell.
Preferably, the outer peripheral wall of the reaction device shell is provided with a jacket, and a heating medium is injected into the jacket.
Preferably, the jacket is coated with an insulating layer.
Preferably, the heating medium comprises heat transfer oil.
Preferably, the reaction device shell is provided with an observation window.
In the invention, an operator can observe the heating and melting device of the phase change energy storage material through the observation window, so that the visualization of the reaction process is realized.
Preferably, a top feed inlet of the reaction device shell is in butt joint with a discharge end of the second feeding device through a second feeding medium pipe, and the mixture temporarily stored in the buffer storage tank is lifted by the second feeding device and is sent to the reaction device through the second feeding medium pipe.
Preferably, the bottom of the shell of the reaction device is externally connected with a discharging medium pipe.
Preferably, a finished product outlet control device is arranged on the discharging medium pipe.
Preferably, the discharge end of the discharge medium pipe is provided with a flange, and the flange is detachably connected with the collection unit.
As a preferable technical scheme of the invention, the collecting unit comprises a movable storage tank and a fixed heat storage tank, and an outlet at the bottom of the reaction kettle is in switching connection with the movable storage tank or the fixed heat storage tank through a discharging medium pipe.
Preferably, a control valve is arranged on the discharging medium pipe.
Preferably, the control valve is an electric valve or an electromagnetic valve.
Preferably, a conveying device is arranged at the inlet end of the fixed heat storage box, and the phase-change heat storage material obtained by reaction is discharged by the discharging medium pipe and then is conveyed to the fixed heat storage box through the conveying device to be collected and stored.
Preferably, the inlet end of the fixed heat storage tank is connected with the conveying device through a third feeding medium pipe.
Preferably, the delivery device is an electric pump.
In the invention, a finished product outlet control device which takes a valve as a control switch is arranged on the discharging medium pipe of the reaction device, and the prepared phase-change heat storage material can directly enter a movable storage tank which can be moved to any place through the finished product outlet control device and can also be filled into a fixed heat storage box through a conveying device, thereby realizing the large-batch continuous production of the phase-change heat storage material.
As a preferred technical solution of the present invention, the reaction unit further includes a temperature control module, and the temperature control module is configured to monitor a reaction temperature in the reaction device and control an output power of the heating device.
Preferably, the temperature control module including be fixed in the temperature measuring device of reaction unit shells inner wall and with temperature measuring device electric connection's control module group, control module group and heating device feedback be connected, temperature measuring device be used for monitoring the reaction temperature in the reaction unit and to control module group output temperature data, control module group is according to the output of the temperature data feedback control heating device who receives.
Preferably, the control module comprises a control device and a human-computer interface which are electrically connected, and the control device is connected with the heating device in a feedback manner.
Preferably, the human-computer interaction interface comprises a display screen and a control panel which are electrically connected, the display screen is used for receiving and displaying temperature data, and the control panel is used for realizing human-computer interaction and data communication.
Preferably, the temperature measuring device is a thermocouple.
In the invention, the temperature control module is additionally arranged, so that strict temperature control in the reaction device is realized, and an operator can freely switch between an automatic control mode and a manual control mode so as to meet the requirement of large-scale batch production of the phase-change heat storage material in a safe and reliable reaction environment.
In a second aspect, the present invention provides a method for preparing a phase-change heat storage material by using the system apparatus of the first aspect, the method comprising:
the raw materials stored in the storage unit are lifted by the first feeding device and sent into the mixing unit, the raw materials are lifted by the second feeding device after being mixed and sent into the reaction device, and the phase-change heat storage materials are obtained through reaction and fall into the collecting unit to be collected and stored.
As a preferred technical solution of the present invention, the method specifically comprises the following steps:
the method comprises the following steps that (I) raw materials stored in a storage unit are fed into a mixing device through a first feeding device, are stirred and mixed and then enter a buffer storage tank, and mixed materials temporarily stored in the buffer storage tank are fed into a reaction device through a second feeding device;
(II) stir the heating to the raw materials in reaction unit, carry out monitor control through the temperature control module to the temperature in the reaction unit, heat to the complete molten state when the raw materials, discharge directly after the stirring forms the eutectic mixture and fall into portable storage tank or send into fixed heat accumulation case through conveyor.
As a preferred technical solution of the present invention, the control modes of the temperature control module in step (ii) include a manual control mode and an automatic control mode.
Preferably, the manual control mode is as follows: real-time temperature data output by the temperature measuring device is received and displayed through the human-computer interaction interface, an operator judges and operates the control panel based on the temperature data, and the output power of the heating device is controlled through the control device.
Preferably, the automatic control mode is as follows: an operator inputs a target temperature interval in advance through the control panel, real-time temperature data output by the temperature measuring device is transmitted to the control device, the control device carries out logic comparison on the real-time temperature data and the target temperature interval, and the output power of the heating device is controlled according to a comparison result.
Preferably, the relationship between the comparison result and the control operation is as follows: when the real-time temperature data falls into the target temperature interval, the control operation is not carried out; when the real-time temperature data is lower than the lower limit of the target temperature interval, controlling the heating device to improve the output power; and when the real-time temperature data exceeds the upper limit of the target temperature interval, controlling the heating device to reduce the output power.
In a preferred embodiment of the present invention, in step (i), the raw materials include crystalline hydrated salt, thickener and heat conductive filler.
Preferably, the crystalline hydrated salt constitutes 85 to 98 wt% of the total mass of the starting material, and may be, for example, 85 wt%, 86 wt%, 87 wt%, 88 wt%, 89 wt%, 90 wt%, 91 wt%, 92 wt%, 93 wt%, 94 wt%, 95 wt%, 96 wt%, 97 wt%, or 98 wt%, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
Preferably, the thickener accounts for 1-10 wt% of the total mass of the raw materials, and may be, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt% or 10 wt%, but is not limited to the enumerated values, and other unrecited values within the range of the enumerated values are also applicable.
Preferably, the thermally conductive filler accounts for 1-5 wt% of the total mass of the raw materials, and may be, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the crystalline hydrated salt comprises magnesium nitrate hexahydrate.
Preferably, the thickener comprises sodium carboxymethyl cellulose.
Preferably, the thermally conductive filler comprises graphite.
Preferably, the stirring and mixing time is 10 to 50min, for example, 10min, 15min, 20min, 25min, 30min, 35min, 40min, 45min or 50min, but not limited to the values listed, and other values not listed in the range of the values are also applicable, and more preferably, the stirring and mixing time is 20 to 30 min.
Preferably, in step (II), the raw material is stirred by a stirring device, the rotation speed of the stirring device is 30-60 rad/min, such as 30rad/min, 35rad/min, 40rad/min, 45rad/min, 50rad/min, 55rad/min or 60rad/min, but not limited to the listed values, and other non-listed values within the range of values are also applicable, and more preferably, the rotation speed of the stirring device is 40-50 rad/min.
Preferably, the raw material is heated by a heating device, the heating temperature is 90 to 120 ℃, for example, 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃ or 120 ℃, but the heating temperature is not limited to the recited values, other values not recited in the range of the values are also applicable, and the heating temperature is more preferably 95 to 110 ℃.
Preferably, the stirring and heating time is 1 to 3 hours, for example, 1.0 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, 2.0 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours or 3.0 hours, but the stirring and heating time is not limited to the recited values, and other values not recited in the numerical range are also applicable.
It should be noted that, the main invention of the present invention is to provide a complete system apparatus suitable for mass production of phase change heat storage materials, and the target product and the reaction condition are not the focus of the present invention, and are not specifically required or limited herein.
Exemplarily, taking the preparation of the magnesium nitrate hexahydrate phase-change heat storage material as an example, the system device provided by the invention is adopted to continuously produce the magnesium nitrate hexahydrate phase-change heat storage material in batch, and the specific process steps comprise:
putting raw materials of magnesium nitrate hexahydrate, thickener sodium carboxymethylcellulose and high-thermal-conductivity filler graphite into a storage bin according to a proportion, lifting and conveying the raw materials by a first feeding device, feeding the raw materials into a mixing device through a first feeding medium pipe, carrying out spiral stirring to obtain a mixed material, feeding the mixed material into a buffer storage tank under the control of a valve, lifting and conveying the mixed material by a second feeding device, feeding the mixed material into a reaction device through a second feeding medium pipe, heating the mixed material to prepare the magnesium nitrate hexahydrate phase-change heat storage material, monitoring and controlling the heating temperature in the reaction device in real time by a temperature control module, stirring the mixed material by the stirring device while heating the mixed material, observing whether the magnesium nitrate phase-change heat storage material in the reaction device is completely melted from a solid state to a liquid state by an operator through an observation window, and after the magnesium nitrate phase-change heat storage material in the reaction device is completely melted to a, and starting the finished product outlet control device, and enabling the prepared phase change heat storage material to flow into the movable storage tank through the discharging medium pipe or be filled into the fixed heat storage tank through the third feeding medium pipe by the conveying device.
It should be clear that the system device provided by the present invention is not limited to the preparation of magnesium nitrate hexahydrate phase change heat storage materials, and other types of phase change heat storage materials can also be produced in large scale by using the system device provided by the present invention.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the system device provided by the invention improves the production continuity of the phase change heat storage material by arranging the feeding unit, and lays an equipment foundation for the automation and scale production of the phase change heat storage material.
(2) The mixing unit is arranged at the process upstream of the reaction unit, so that the raw materials are premixed, the mixing time in the reaction unit is further shortened, and the mixing effect is improved.
(3) The temperature control module is additionally arranged, so that strict temperature control of the interior of the reaction device is realized, and an operator can freely switch between an automatic control mode and a manual control mode so as to meet the requirement of large-scale batch production of the phase-change heat storage material in a safe and reliable reaction environment.
Drawings
Fig. 1 is a schematic structural diagram of a system apparatus according to an embodiment of the present invention.
Wherein, 1-a storage bin; 2-a first feeding device; 3-a first feed medium pipe; 4-a mixing device; 5-a valve; 6-buffer storage tank; 7-a second feeding device; 8-a second feed medium pipe; 9-an external motor; 10-a reaction unit; 11-a temperature measuring device; 12-a viewing window; 13-finished product outlet control means; 14-a discharge medium pipe; 15-a flange; 16-a mobile storage tank; 17-a conveying device; 18-a third feed medium pipe; 19-fixed heat storage tank.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In one embodiment, the invention provides a system device of a phase-change heat storage material as shown in fig. 1, which comprises a storage unit, a mixing unit, a reaction unit and a collection unit which are connected in sequence along a material flow direction. The system device further comprises a feeding unit, the feeding unit comprises a first feeding device 2 and a second feeding device 7, two ends of the first feeding device 2 are respectively in butt joint with the storage unit and the mixing unit, and two ends of the second feeding device 7 are respectively in butt joint with the mixing unit and the reaction unit. Specifically, the first feeding device 2 and the second feeding device 7 are both lifters.
The storage unit comprises a silo 1.
The mixing unit comprises a mixing device 4 and a buffer storage tank 6, wherein the buffer storage tank 6 is positioned below the mixing device 4 and is used for receiving the mixed material discharged from a discharge port at the bottom of the mixing device 4. The top feed inlet of mixing arrangement 4 passes through the discharge end of first feeding medium pipe 3 butt joint first loading attachment 2, and the raw materials of storage in the feed bin 1 promote through first loading attachment 2 and send into mixing arrangement 4 by first feeding medium pipe 3, and the discharge gate of buffer storage tank 6 is connected the feed end of second loading attachment 7. A valve 5 is arranged at the bottom discharge opening of the mixing device 4, optionally the valve 5 is of the electric valve or electromagnetic valve type. Specifically, the mixing device 4 is a horizontal mixer.
The reaction unit comprises a reaction device 10 and a stirring assembly, wherein the stirring assembly comprises a stirring device positioned in the reaction device shell and an external motor 9 in transmission connection with the top of the stirring device. The inside of the reaction device shell is provided with a heating device. The outer peripheral wall of the reaction device shell is provided with a jacket, and a heating medium is injected into the jacket, wherein the heating medium is optionally heat conduction oil. The reaction device shell is provided with an observation window 12. The top feed inlet of reaction unit casing passes through the discharge end of second feeding medium pipe 8 butt joint second loading attachment 7, and the mixed material of keeping in buffer storage 6 promotes through second loading attachment 7 and sends into reaction unit 10 by second feeding medium pipe 8. The bottom of the shell of the reaction device 10 is externally connected with a discharging medium pipe 14, a finished product outlet control device 13 is arranged on the discharging medium pipe 14, and optionally, the finished product outlet control device 13 is an electric valve or an electromagnetic valve. The discharge end of the discharge medium pipe 14 is provided with a flange 15, and the flange 15 is detachably connected with the collection unit.
The collecting unit comprises a movable storage tank 16 and a fixed heat storage tank 19, and the bottom outlet of the reaction kettle is connected with the movable storage tank 16 or the fixed heat storage tank 19 through a discharging medium pipe 14 in a switching mode. The inlet end of the fixed heat storage box 19 is provided with a conveying device 17, and the phase change heat storage material obtained by reaction is discharged from the discharging medium pipe 14 and then is conveyed into the fixed heat storage box 19 through the conveying device 17 to be collected and stored. Further, the inlet end of the fixed heat storage tank 19 is connected with the conveying device 17 through a third feeding medium pipe 18. In particular, the delivery device 17 is an electric pump.
The reaction unit further comprises a temperature control module for monitoring the reaction temperature in the reaction device 10 and controlling the output power of the heating device. Specifically, the temperature control module comprises a temperature measuring device 11 fixed on the inner wall of the shell of the reaction device 10 and a control module electrically connected with the temperature measuring device 11, the control module is connected with the heating device in a feedback mode, the temperature measuring device 11 is used for monitoring the reaction temperature in the reaction device 10 and outputting temperature data to the control module, and the control module controls the output power of the heating device according to the received temperature data in a feedback mode. Specifically, the temperature measuring device 11 is a thermocouple. Further, the control module comprises a control device and a human-computer interface (not shown in the figure) which are electrically connected, and the control device is connected with the heating device in a feedback manner. The human-computer interaction interface comprises a display screen and a control panel which are electrically connected, the display screen is used for receiving and displaying temperature data, and the control panel is used for realizing human-computer interaction and data communication.
Example 1
The embodiment provides a method for preparing a magnesium nitrate hexahydrate phase-change heat storage material by adopting a system device provided by a specific embodiment, and the method specifically comprises the following steps:
(1) magnesium nitrate hexahydrate, sodium carboxymethylcellulose and graphite stored in the storage unit are sequentially fed into a mixing device 4 through a first feeding device 2, wherein the magnesium nitrate hexahydrate accounts for 85 wt% of the total mass of the raw materials, the sodium carboxymethylcellulose accounts for 10 wt% of the total mass of the raw materials, and the graphite accounts for 5 wt% of the total mass of the raw materials; the raw materials are stirred and mixed for 10min in the mixing device 4 to form a mixed material, the mixed material flows into the buffer storage tank 6 for temporary storage, and the mixed material temporarily stored in the buffer storage tank 6 is sent into the reaction device 10 through the second feeding device 7;
(2) stirring the mixed materials in a reaction device 10 by a stirring device, wherein the rotating speed of the stirring device is 30rad/min, heating the raw materials by a heating device, the heating temperature of the heating device is set to be 90 ℃, and the stirring and heating time is 3 hours;
(3) in the stirring and heating process, the temperature in the reaction device 10 is monitored and controlled through the temperature control module, the temperature control module is switched to be manually controlled by an operator, real-time temperature data output by the temperature measuring device 11 is received and displayed through the man-machine interaction interface, the operator judges and operates the control panel based on the temperature data, the output power of the heating device is controlled through the control device until the actually measured temperature is controlled at 90 ℃. When the raw materials are heated to a completely molten state, the raw materials are uniformly stirred to form a eutectic mixture, and the eutectic mixture is discharged and directly falls into a mobile storage tank 16 or is filled into a fixed heat storage tank 19 through a conveying device 17.
The phase change latent heat of the prepared phase change heat storage material is 155kJ/kg, the phase change temperature is 85 ℃, and the supercooling degree is 0.2 ℃.
Example 2
The embodiment provides a method for preparing a magnesium nitrate hexahydrate phase-change heat storage material by adopting a system device provided by a specific embodiment, and the method specifically comprises the following steps:
(1) magnesium nitrate hexahydrate, sodium carboxymethylcellulose and graphite stored in the storage unit are sequentially fed into a mixing device 4 through a first feeding device 2, wherein the magnesium nitrate hexahydrate accounts for 87 wt% of the total mass of the raw materials, the thickening agent accounts for 9 wt% of the total mass of the raw materials, and the heat-conducting filler accounts for 4 wt% of the total mass of the raw materials; the raw materials are stirred and mixed for 20min and then enter a buffer storage tank 6, and the mixed materials temporarily stored in the buffer storage tank 6 are sent to a reaction device 10 through a second feeding device 7;
(2) stirring the raw materials in a reaction device 10 by a stirring device, wherein the rotating speed of the stirring device is 35rad/min, heating the raw materials by a heating device, the heating temperature of the heating device is set to be 100 ℃, and the stirring and heating time is 2.5 hours;
(3) in the stirring and heating process, the temperature in the reaction device 10 is monitored and controlled through the temperature control module, an operator switches the temperature control module into automatic control, a target temperature interval is input in advance through the control panel, real-time temperature data output by the temperature measuring device 11 is transmitted to the control device, the control device logically compares the real-time temperature data with the target temperature interval, and the output power of the heating device is controlled according to the comparison result; the relationship between the comparison result and the control operation is: when the real-time temperature data falls into the target temperature interval, the control operation is not carried out; when the real-time temperature data is lower than the lower limit of the target temperature interval, controlling the heating device to improve the output power; and when the real-time temperature data exceeds the upper limit of the target temperature interval, controlling the heating device to reduce the output power until the actually measured temperature is controlled at 100 ℃. When the raw materials are heated to a completely molten state, the raw materials are uniformly stirred to form a eutectic mixture, and the eutectic mixture is discharged and directly falls into a mobile storage tank 16 or is filled into a fixed heat storage tank 19 through a conveying device 17.
The phase change latent heat of the prepared phase change heat storage material is 150kJ/kg, the phase change temperature is 87 ℃, and the supercooling degree is 0.5 ℃.
Example 3
The embodiment provides a method for preparing a magnesium nitrate hexahydrate phase-change heat storage material by adopting a system device provided by a specific embodiment, and the method specifically comprises the following steps:
(1) magnesium nitrate hexahydrate, sodium carboxymethylcellulose and graphite stored in the storage unit are sequentially fed into a mixing device 4 through a first feeding device 2, wherein the magnesium nitrate hexahydrate accounts for 90 wt% of the total mass of the raw materials, the thickening agent accounts for 7 wt% of the total mass of the raw materials, and the heat-conducting filler accounts for 3 wt% of the total mass of the raw materials; the raw materials are stirred and mixed for 30min and then enter a buffer storage tank 6, and the mixed materials temporarily stored in the buffer storage tank 6 are sent to a reaction device 10 through a second feeding device 7;
(2) stirring the raw materials in a reaction device 10 by a stirring device, wherein the rotating speed of the stirring device is 40rad/min, heating the raw materials by a heating device, the heating temperature of the heating device is set to be 100 ℃, and the stirring and heating time is 2 hours;
(3) in the stirring and heating process, the temperature in the reaction device 10 is monitored and controlled through the temperature control module, the temperature control module is switched to be manually controlled by an operator, real-time temperature data output by the temperature measuring device 11 is received and displayed through the man-machine interaction interface, the operator judges and operates the control panel based on the temperature data, the output power of the heating device is controlled through the control device until the actually measured temperature is controlled at 105 ℃. When the raw materials are heated to a completely molten state, the raw materials are uniformly stirred to form a eutectic mixture, and the eutectic mixture is discharged and directly falls into a mobile storage tank 16 or is filled into a fixed heat storage tank 19 through a conveying device 17.
The phase change latent heat of the prepared phase change heat storage material is 148kJ/kg, the phase change temperature is 87 ℃, and the supercooling degree is 0.2 ℃.
Example 4
The embodiment provides a method for preparing a magnesium nitrate hexahydrate phase-change heat storage material by adopting a system device provided by a specific embodiment, and the method specifically comprises the following steps:
(1) magnesium nitrate hexahydrate, sodium carboxymethylcellulose and graphite stored in the storage unit are sequentially fed into a mixing device 4 through a first feeding device 2, wherein the magnesium nitrate hexahydrate accounts for 95 wt% of the total mass of the raw materials, the thickening agent accounts for 3 wt% of the total mass of the raw materials, and the heat-conducting filler accounts for 2 wt% of the total mass of the raw materials; the raw materials are stirred and mixed for 40min and then enter a buffer storage tank 6, and the mixed materials temporarily stored in the buffer storage tank 6 are sent to a reaction device 10 through a second feeding device 7;
(2) stirring the raw materials in a reaction device 10 by a stirring device, wherein the rotating speed of the stirring device is 50rad/min, heating the raw materials by a heating device, the heating temperature of the heating device is set to be 110 ℃, and the stirring and heating time is 1.5 h;
(3) in the stirring and heating process, the temperature in the reaction device 10 is monitored and controlled through the temperature control module, an operator switches the temperature control module into automatic control, a target temperature interval is input in advance through the control panel, real-time temperature data output by the temperature measuring device 11 is transmitted to the control device, the control device logically compares the real-time temperature data with the target temperature interval, and the output power of the heating device is controlled according to the comparison result; the relationship between the comparison result and the control operation is: when the real-time temperature data falls into the target temperature interval, the control operation is not carried out; when the real-time temperature data is lower than the lower limit of the target temperature interval, controlling the heating device to improve the output power; and when the real-time temperature data exceeds the upper limit of the target temperature interval, controlling the heating device to reduce the output power until the actually measured temperature is controlled at 110 ℃. When the raw materials are heated to a completely molten state, the raw materials are uniformly stirred to form a eutectic mixture, and the eutectic mixture is discharged and directly falls into a mobile storage tank 16 or is filled into a fixed heat storage tank 19 through a conveying device 17.
The phase change latent heat of the prepared phase change heat storage material is 142kJ/kg, the phase change temperature is 86 ℃, and the supercooling degree is 0.3 ℃.
Example 5
The embodiment provides a method for preparing a magnesium nitrate hexahydrate phase-change heat storage material by adopting a system device provided by a specific embodiment, and the method specifically comprises the following steps:
(1) magnesium nitrate hexahydrate, sodium carboxymethylcellulose and graphite stored in the storage unit are sequentially fed into a mixing device 4 through a first feeding device 2, wherein the magnesium nitrate hexahydrate accounts for 98 wt% of the total mass of the raw materials, the thickening agent accounts for 1 wt% of the total mass of the raw materials, and the heat-conducting filler accounts for 1 wt% of the total mass of the raw materials; the raw materials are stirred and mixed for 50min and then enter a buffer storage tank 6, and the mixed materials temporarily stored in the buffer storage tank 6 are sent to a reaction device 10 through a second feeding device 7;
(1) stirring the raw materials in a reaction device 10 by a stirring device, wherein the rotating speed of the stirring device is 60rad/min, heating the raw materials by a heating device, the heating temperature of the heating device is set to be 120 ℃, and the stirring and heating time is 1 h;
(3) in the stirring and heating process, the temperature in the reaction device 10 is monitored and controlled through the temperature control module, the temperature control module is switched to be manually controlled by an operator, real-time temperature data output by the temperature measuring device 11 is received and displayed through the man-machine interaction interface, the operator judges and operates the control panel based on the temperature data, the output power of the heating device is controlled through the control device until the actually measured temperature is controlled at 120 ℃. When the raw materials are heated to a completely molten state, the raw materials are uniformly stirred to form a eutectic mixture, and the eutectic mixture is discharged and directly falls into a mobile storage tank 16 or is filled into a fixed heat storage tank 19 through a conveying device 17.
The phase change latent heat of the prepared phase change heat storage material is 146kJ/kg, the phase change temperature is 85 ℃, and the supercooling degree is 0.4 ℃.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The system device for automatically producing the phase-change heat storage material in batch is characterized by comprising a storage unit, a mixing unit, a reaction unit and a collecting unit which are sequentially connected along the material flow direction;
the system device also comprises a feeding unit, the feeding unit comprises a first feeding device and a second feeding device, the two ends of the first feeding device are respectively butted with the storage unit and the mixing unit, and the two ends of the second feeding device are respectively butted with the mixing unit and the reaction unit.
2. The system of claim 1 wherein said storage unit comprises a silo;
preferably, the first feeding device and the second feeding device are both material lifting machines.
3. The system set forth in claim 1 or 2, wherein the mixing unit comprises a mixing device and a buffer tank located below the mixing device for receiving the mixed material discharged from the bottom outlet of the mixing device;
preferably, a top feeding port of the mixing device is in butt joint with a discharging end of the first feeding device through a first feeding medium pipe, raw materials stored in the bin are lifted by the first feeding device and are sent to the mixing device through the first feeding medium pipe, and a discharging port of the buffer storage tank is connected with a feeding end of the second feeding device;
preferably, a valve is arranged at a discharge port at the bottom of the mixing device;
preferably, the valve is an electric valve or an electromagnetic valve;
preferably, the mixing device is a horizontal mixer;
preferably, the inner wall of the mixing device, the feeding end of the mixing device, the discharging end of the mixing device and the buffer storage tank are all subjected to anti-corrosion treatment;
preferably, the shell material of mixing arrangement and the shell material of buffer tank be stainless steel.
4. The system device according to any one of claims 1 to 3, wherein the reaction unit comprises a reaction device and a stirring assembly, and the stirring assembly comprises a stirring device positioned inside a shell of the reaction device and an external motor in transmission connection with the top of the stirring device;
preferably, a heating device is arranged inside the reaction device shell;
preferably, the outer peripheral wall of the reaction device shell is provided with a jacket, and a heating medium is injected into the jacket;
preferably, the outer side of the jacket is coated with a heat-insulating layer;
preferably, the heating medium comprises heat conducting oil;
preferably, the reaction device shell is provided with an observation window;
preferably, a top feed port of the shell of the reaction device is in butt joint with a discharge end of the second feeding device through a second feeding medium pipe, and the mixture temporarily stored in the buffer storage tank is lifted by the second feeding device and is sent to the reaction device through the second feeding medium pipe;
preferably, the bottom of the shell of the reaction device is externally connected with a discharging medium pipe;
preferably, a finished product outlet control device is arranged on the discharging medium pipe;
preferably, the discharge end of the discharge medium pipe is provided with a flange, and the flange is detachably connected with the collection unit.
5. The system device according to any one of claims 1 to 4, wherein the collecting unit comprises a movable storage tank and a fixed heat storage tank, and the bottom outlet of the reaction kettle is in switching connection with the movable storage tank or the fixed heat storage tank through a discharging medium pipe;
preferably, a control valve is arranged on the discharging medium pipe;
preferably, the control valve is an electric valve or an electromagnetic valve;
preferably, a conveying device is arranged at the inlet end of the fixed heat storage box, and the phase-change heat storage material obtained by reaction is discharged by a discharging medium pipe and then is conveyed into the fixed heat storage box through the conveying device to be collected and stored;
preferably, the inlet end of the fixed heat storage box is connected with the conveying device through a third feeding medium pipe;
preferably, the delivery device is an electric pump.
6. The system set forth in any one of claims 1 to 5, wherein the reaction unit further comprises a temperature control module for monitoring the reaction temperature in the reaction device and controlling the output power of the heating device;
preferably, the temperature control module comprises a temperature measuring device fixed on the inner wall of the shell of the reaction device and a control module electrically connected with the temperature measuring device, the control module is connected with the heating device in a feedback manner, the temperature measuring device is used for monitoring the reaction temperature in the reaction device and outputting temperature data to the control module, and the control module controls the output power of the heating device in a feedback manner according to the received temperature data;
preferably, the control module comprises a control device and a human-computer interaction interface which are electrically connected, and the control device is connected with the heating device in a feedback manner;
preferably, the human-computer interaction interface comprises a display screen and a control panel which are electrically connected, the display screen is used for receiving and displaying temperature data, and the control panel is used for realizing human-computer interaction and data communication;
preferably, the temperature measuring device is a thermocouple.
7. A method for batch automated production of phase change heat storage material, wherein the phase change heat storage material is prepared by using the system device of any one of claims 1 to 6, the method comprising:
the raw materials stored in the storage unit are lifted by the first feeding device and sent into the mixing unit, the raw materials are lifted by the second feeding device after being mixed and sent into the reaction device, and the phase-change heat storage materials are obtained through reaction and fall into the collecting unit to be collected and stored.
8. The method according to claim 7, characterized in that it comprises in particular the steps of:
the method comprises the following steps that (I) raw materials stored in a storage unit are fed into a mixing device through a first feeding device, are stirred and mixed and then enter a buffer storage tank, and mixed materials temporarily stored in the buffer storage tank are fed into a reaction device through a second feeding device;
(II) stir the heating to the raw materials in reaction unit, carry out monitor control through the temperature control module to the temperature in the reaction unit, heat to the complete molten state when the raw materials, discharge directly after the stirring forms the eutectic mixture and fall into portable storage tank or send into fixed heat accumulation case through conveyor.
9. The method of claim 8, wherein the control modes of the temperature control module in step (ii) include a manual control mode and an automatic control mode;
preferably, the manual control mode is as follows: real-time temperature data output by the temperature measuring device is received and displayed through a human-computer interaction interface, an operator judges and operates the control panel based on the temperature data, and the output power of the heating device is controlled through the control device;
preferably, the automatic control mode is as follows: an operator inputs a target temperature interval in advance through a control panel, real-time temperature data output by the temperature measuring device is transmitted to the control device, the control device logically compares the real-time temperature data with the target temperature interval, and the output power of the heating device is controlled according to a comparison result;
preferably, the relationship between the comparison result and the control operation is as follows: when the real-time temperature data falls into the target temperature interval, the control operation is not carried out; when the real-time temperature data is lower than the lower limit of the target temperature interval, controlling the heating device to improve the output power; and when the real-time temperature data exceeds the upper limit of the target temperature interval, controlling the heating device to reduce the output power.
10. The method according to claim 8 or 9, wherein in step (i), the raw materials comprise a crystalline hydrated salt, a thickener and a thermally conductive filler;
preferably, the crystalline hydrated salt accounts for 85-98 wt% of the total mass of the raw materials;
preferably, the thickening agent accounts for 1-10 wt% of the total mass of the raw materials;
preferably, the heat-conducting filler accounts for 1-5 wt% of the total mass of the raw materials;
preferably, the crystalline hydrated salt comprises magnesium nitrate hexahydrate;
preferably, the thickener comprises sodium carboxymethyl cellulose;
preferably, the thermally conductive filler comprises graphite;
preferably, the stirring and mixing time is 10-50 min, and further preferably, the stirring and mixing time is 20-30 min;
preferably, in the step (II), the raw materials are stirred by a stirring device, the rotating speed of the stirring device is 30-60 rad/min, and further preferably, the rotating speed of the stirring device is 40-50 rad/min;
preferably, the raw materials are heated by a heating device, wherein the heating temperature is 90-120 ℃, and further preferably, the heating temperature is 95-110 ℃;
preferably, the stirring and heating time is 1-3 h.
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