CN111748322A - A system device and method for batch automatic production of phase change heat storage materials - Google Patents

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

A system device and method for batch automatic production of phase change heat storage materials

technical field

The invention belongs to the technical field of production of phase-change heat storage materials, relates to a system device and method for phase-change heat-storage materials, and particularly relates to a system device and method for batch automated production of phase-change heat-storage materials.

Background technique

Phase change materials use latent heat of phase change to store and release energy. During the phase change process, the phase change material stores and releases energy through endothermic and exothermic heat, so as to achieve the purpose of controlling the temperature of the surrounding environment. Due to its high energy storage density and approximately isothermal phase transition process, it has broad application prospects in the fields of building energy saving, solar energy, grid "peak shaving and valley filling", aerospace and daily necessities. Once this material is widely used in human life, it will become the best green carrier for energy saving and environmental protection. To adapt to the process requirements, to meet the large-scale and mass production of phase change materials under the premise of safety and reliability.

CN107824064A discloses an automatic preparation device for composite heat storage materials, which includes a negative pressure conveying and batching system, a mixing system, a packaging system and an electric control system. The electronic control system controls the negative pressure conveying and batching system according to the raw material ratio and controls the automatic operation of each system, so as to realize the automatic and continuous compounding of the composite heat storage material. However, the temperature control and the mixing situation during the mixing process are not controllable, and there are problems of insufficient or excessive reaction.

CN107244006A discloses a phase change material processing production line, including a solid raw material system, a liquid raw material system, a mixing system and a post-processing system. The liquid raw materials and solid raw materials can be completely mixed at a ratio of nearly 1:1 and made into qualified products, and continuous, automated and mass production can be realized under the condition of stable supply and transportation of raw materials. The main body of the mixing system is at least one screw extruder, so the equipment cost of the invention is high, which is not conducive to large-scale production.

CN104559937A discloses an energy-saving phase change material energy storage agent production equipment, including a heat storage device, a mixer and an extruder. The phase change material heat storage device that converts solar energy into thermal energy storage and release is connected to the mixer and the extruder through a circulation system for heat exchange, which has the advantages of energy saving, easy production, and good stability of the produced phase change material. However, the solar collector requires a large area, and the production scale is difficult, and the invention does not have the ability of automatic production.

None of the above phase change energy storage material production equipment can effectively solve the problems of automatic temperature control, production scale and automation. Therefore, how to ensure the quality of the phase change energy storage materials, while also ensuring the automation and large-scale production methods of the production process, has become an urgent problem to be solved at present.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a system device and method for a phase change heat storage material. The system device provided by the present invention improves the continuity of the production of the phase change heat storage material by setting a feeding unit. , which laid the equipment foundation for the automation and large-scale production of phase change heat storage materials. In addition, by arranging a mixing unit in the process upstream of the reaction unit, the raw materials are pre-mixed, which further shortens the mixing time in the reaction unit and improves the mixing effect.

For this purpose, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides a system device for batch automated production of phase change heat storage materials,

The system device includes a material storage unit, a mixing unit, a reaction unit and a collection unit connected in sequence along the material flow direction.

The system device further includes a feeding unit, the feeding unit includes a first feeding device and a second feeding device, and two ends of the first feeding device are respectively connected to the storage unit and the mixing unit, The two ends of the second feeding device are respectively connected to the mixing unit and the reaction unit.

The system device provided by the invention improves the continuity of the production of the phase change heat storage material by setting the feeding unit, and lays an equipment foundation for the automation and scale of the production of the phase change heat storage material. In addition, by arranging a mixing unit in the process upstream of the reaction unit, the raw materials are pre-mixed, which further shortens the mixing time in the reaction unit and improves the mixing effect.

As a preferred technical solution of the present invention, the storage unit includes a silo.

Preferably, the first feeding device and the second feeding device are both feeders.

As a preferred technical solution of the present invention, the mixing unit includes a mixing device and a buffer storage tank, and the buffer storage tank is located below the mixing device to receive the mixed material discharged from the outlet at the bottom of the mixing device.

Preferably, the feed port at the top of the mixing device is connected to the discharge end of the first feeding device through the first feeding medium pipe, and the raw materials stored in the silo are lifted by the first feeding device from the first feeding medium. The pipe is fed into the mixing device, and the outlet of the buffer storage tank is connected to the feeding end of the second feeding device.

Preferably, a valve is provided at the bottom discharge port of the mixing device.

Preferably, the valve is an electric valve or a solenoid 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 treated with anticorrosion.

Preferably, the shell material of the mixing device and the shell material of the buffer storage tank are stainless steel.

As a preferred technical solution of the present invention, the reaction unit includes a reaction device and a stirring assembly, and the stirring assembly includes a stirring device located inside the shell of the reaction device and an external motor connected to the top of the stirring device. .

Preferably, a heating device is provided inside the shell of the reaction device.

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 covered with a thermal insulation layer.

Preferably, the heating medium includes heat-conducting oil.

Preferably, an observation window is provided on the shell of the reaction device.

In the present invention, the operator can observe the heating and melting device of the phase change energy storage material through the observation window, so as to realize the visualization of the reaction process.

Preferably, the feed port at the top of the reaction device shell is connected to the discharge end of the second feeding device through the second feeding medium pipe, and the mixed material temporarily stored in the buffer storage tank is lifted by the second feeding device. The second feed medium pipe is fed into the reaction unit.

Preferably, a discharge medium pipe is externally connected to the bottom of the reaction device shell.

Preferably, the discharge medium pipe is provided with a finished product outlet control device.

Preferably, the discharge end of the discharge medium pipe is provided with a flange, and the flange is detachably connected to the collecting unit.

As a preferred technical solution of the present invention, the collection unit includes a mobile storage tank and a fixed heat storage tank, and the bottom outlet of the reaction kettle is switched and connected to the mobile storage tank or the fixed storage tank through a discharge medium pipe. hot box.

Preferably, a control valve is provided on the discharge medium pipe.

Preferably, the control valve is an electric valve or a solenoid valve.

Preferably, the inlet end of the stationary heat storage tank is provided with a conveying device, and the phase-change heat storage material obtained by the reaction is discharged from the discharge medium pipe and sent to the stationary heat storage tank through the conveying device for collection and storage.

Preferably, the inlet end of the stationary heat storage tank is connected to the conveying device through a third feeding medium pipe.

Preferably, the conveying device is an electric pump.

In the present invention, the discharge medium pipe of the reaction device is provided with a finished product outlet control device with a valve as a control switch, and the prepared phase change heat storage material can directly enter the mobile device and can be moved to any place through the finished product outlet control device. In the storage tank, it can be filled into the fixed heat storage tank through the conveying device, so as to realize the large-scale 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 used to monitor the reaction temperature in the reaction device and control the output power of the heating device.

Preferably, the temperature control module includes a temperature measurement device fixed on the inner wall of the reaction device shell and a control module electrically connected with the temperature measurement device, and the control module is feedback connected with the heating device, so The temperature measuring device is used to monitor the reaction temperature in the reaction device and output temperature data to the control module, and the control module feeds back and controls the output power of the heating device according to the received temperature data.

Preferably, the control module includes an electrically connected control device and a human-machine interface, and the control device is in feedback connection with the heating device.

Preferably, the human-computer interaction interface includes an electrically connected display screen and a control panel, the display screen is used to receive and display temperature data, and the control panel is used to realize human-computer interaction and data communication.

Preferably, the temperature measuring device is a thermocouple.

In the present invention, a temperature control module is added to realize strict temperature control inside the reaction device, and the operator can switch freely between the automatic control mode and the manual control mode, so as to meet the requirements of the phase change heat storage material in a safe and reliable reaction environment. under mass production.

In a second aspect, the present invention provides a method for a phase change heat storage material, using the system device described in the first aspect to prepare a phase change heat storage material, and the method includes:

The raw materials stored in the storage unit are lifted by the first feeding device and sent to the mixing unit. After mixing, they are lifted by the second feeding device and sent to the reaction device. The phase-change heat storage material obtained from the reaction falls into the collecting unit for collection and storage. .

As a preferred technical solution of the present invention, the method specifically comprises the following steps:

(I) The raw materials stored in the storage unit are sent to the mixing device through the first feeding device, and then enter the buffer storage tank after stirring and mixing, and the mixed material temporarily stored in the buffer storage tank is sent to the reaction device through the second feeding device;

(II) The raw materials are stirred and heated in the reaction device, and the temperature in the reaction device is monitored and controlled by the temperature control module. When the raw materials are heated to a completely melted state, they are uniformly stirred to form a eutectic mixture and discharged directly into the mobile storage tank. Or sent to the fixed heat storage tank through the conveying device.

As a preferred technical solution of the present invention, the control modes of the temperature control module described in step (II) include a manual control mode and an automatic control mode.

Preferably, the manual control mode is as follows: the real-time temperature data output by the temperature measuring device is received and displayed through the human-machine interface, and the operator judges and operates the control panel based on the temperature data, and controls the output power of the heating device via the control device.

Preferably, the automatic control mode is as follows: the operator pre-inputs the target temperature interval through the control panel, the real-time temperature data output by the temperature measuring device is transmitted to the control device, and the control device logically compares the real-time temperature data and the target temperature interval, according to The comparison results control the output power of the heating device.

Preferably, the relationship between the comparison result and the control operation is: when the real-time temperature data falls within the target temperature range, no control operation is performed; when the real-time temperature data is lower than the lower limit of the target temperature range, the heating device is controlled to increase Output power; when the real-time temperature data exceeds the upper limit of the target temperature range, control the heating device to reduce the output power.

As a preferred technical solution of the present invention, in step (I), the raw materials include crystalline hydrated salts, thickeners and thermally conductive fillers.

Preferably, the crystalline hydrated salt accounts for 85-98wt% of the total mass of the raw material, such as 85wt%, 86wt%, 87wt%, 88wt%, 89wt%, 90wt%, 91wt%, 92wt%, 93wt%, 94wt% %, 95 wt %, 96 wt %, 97 wt % or 98 wt %, but are not limited to the recited values, and other non-recited values within the range of values apply equally.

Preferably, the thickener accounts for 1-10wt% of the total mass of the raw material, for example, it can be 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt% %, but is not limited to the recited values, and other unrecited values within the numerical range are equally applicable.

Preferably, the thermally conductive filler accounts for 1 to 5 wt % of the total mass of the raw materials, such as 1 wt %, 2 wt %, 3 wt %, 4 wt % or 5 wt %, but not limited to the listed values, other The same applies to non-recited values.

Preferably, the crystalline hydrated salt includes magnesium nitrate hexahydrate.

Preferably, the thickener includes sodium carboxymethyl cellulose.

Preferably, the thermally conductive filler includes graphite.

Preferably, the stirring and mixing time is 10-50min, for example, it can be 10min, 15min, 20min, 25min, 30min, 35min, 40min, 45min or 50min, but it is not limited to the listed values. The numerical values listed are also applicable, and further preferably, the stirring and mixing time is 20-30 min.

Preferably, in step (II), the raw materials are stirred by a stirring device, and the rotating speed of the stirring device is 30-60 rad/min, such as 30 rad/min, 35 rad/min, 40 rad/min, 45 rad/min, 50rad/min, 55rad/min or 60rad/min, but not limited to the enumerated values, other unenumerated values within this numerical range are also applicable, further preferably, the rotational speed of the stirring device is 40～50rad/min .

Preferably, the raw material is heated by a heating device, and the heating temperature is 90-120°C, such as 90°C, 95°C, 100°C, 105°C, 110°C, 115°C or 120°C, but not limited to The listed numerical values are also applicable to other unlisted numerical values within the numerical range. More preferably, the heating temperature is 95-110°C.

Preferably, the stirring and heating time is 1-3h, for example, it can be 1.0h, 1.2h, 1.4h, 1.6h, 1.8h, 2.0h, 2.2h, 2.4h, 2.6h, 2.8h or 3.0h , but not limited to the recited values, and other unrecited values within this range of values are equally applicable.

It should be noted that the main invention of the present invention is to improve a complete system device suitable for the large-scale batch production of phase change heat storage materials. The target product and reaction conditions are not the research focus of the present invention, and are not detailed here. Requirements and special qualifications.

Exemplarily, taking the preparation of the magnesium nitrate hexahydrate phase change heat storage material as an example, the system device provided by the present invention is used to continuously mass produce the magnesium nitrate hexahydrate phase change heat storage material, and the specific process steps include:

The raw material magnesium nitrate hexahydrate, the thickener sodium carboxymethyl cellulose, and the high thermal conductivity filler graphite are put into the silo according to the proportion, lifted and transported through the first feeding device, and entered into the mixing device through the first feeding medium pipe. The mixed material is obtained by screw stirring. The mixed material enters the buffer storage tank under the control of the valve, is lifted and transported by the second feeding device, and enters the reaction device through the second feeding medium pipe for heating to prepare the magnesium nitrate hexahydrate phase change heat storage material. The heating temperature in the reaction device is monitored and controlled in real time by the temperature control module. While the mixture is heated, the stirring device stirs the mixture, and the operator observes through the observation window whether the magnesium nitrate hexahydrate phase change heat storage material in the reaction device is It is completely melted from solid state to liquid state. After the magnesium nitrate hexahydrate phase change heat storage material in the reaction device is completely melted into liquid state, the finished product outlet control device is started, and the prepared phase change heat storage material flows into the mobile storage device through the discharge medium pipe. The tank is filled into the stationary heat storage tank via the third feed medium pipe, or through 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 batches using the system device provided by the present invention. Technicians need to adjust the preparation process parameters according to different phase change heat storage materials, which are not specifically required or limited in the present invention.

The system refers to an equipment system, a plant system or a production plant.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The system device provided by the present invention improves the continuity of the production of the phase change heat storage material by setting the feeding unit, and lays an equipment foundation for the automation and scale of the production of the phase change heat storage material.

(2) By arranging a mixing unit upstream of the process of the reaction unit to pre-mix the raw materials, the mixing time in the reaction unit is further shortened, and the mixing effect is improved.

(3) A temperature control module is added to realize strict temperature control inside the reaction device. The operator can freely switch between the automatic control mode and the manual control mode to meet the requirements of the phase change heat storage material in a safe and reliable reaction environment. Mass production.

Description of drawings

FIG. 1 is a schematic structural diagram of a system device according to an embodiment of the present invention.

Among them, 1-silo; 2-first feeding device; 3-first feeding medium pipe; 4-mixing device; 5-valve; 6-buffer storage tank; 7-second feeding device; 8-th 2-feeding medium pipe; 9-external motor; 10-reaction device; 11-temperature measuring device; 12-observation window; 13-finished product outlet control device; 14-discharging medium pipe; 15-flange; 16-mobile 17-conveying device; 18-third feeding medium pipe; 19-fixed heat storage tank.

Detailed ways

It should be understood that in the description of the present invention, the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

It should be noted that, in the description of the present invention, unless otherwise expressly specified and limited, the terms "arranged", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

In a specific embodiment, the present invention provides a system device for a phase change heat storage material as shown in FIG. 1 , the system device includes a material storage unit, a mixing unit, a reaction unit and collection unit. The system device also includes a feeding unit. The feeding unit includes a first feeding device 2 and a second feeding device 7. The two ends of the first feeding device 2 are respectively connected to the storage unit and the mixing unit. The second feeding device 7 The two ends of the mixing unit and the reaction unit are respectively docked. Specifically, the first feeding device 2 and the second feeding device 7 are both feeders.

The storage unit includes a silo 1 .

The mixing unit includes a mixing device 4 and a buffer storage tank 6 , and the buffer storage tank 6 is located below the mixing device 4 for receiving the mixed material discharged from the discharge port at the bottom of the mixing device 4 . The top feeding port of the mixing device 4 is connected to the discharge end of the first feeding device 2 through the first feeding medium pipe 3, and the raw materials stored in the silo 1 are lifted by the first feeding medium pipe through the first feeding medium pipe. 3 is sent to the mixing device 4, and the discharge port of the buffer storage tank 6 is connected to the feeding end of the second feeding device 7. A valve 5 is provided at the bottom discharge port of the mixing device 4, and optionally the valve 5 is an electric valve or a solenoid valve. Specifically, the mixing device 4 is a horizontal mixer.

The reaction unit includes a reaction device 10 and a stirring assembly. The stirring assembly includes a stirring device located inside the shell of the reaction device and an external motor 9 that is drivingly connected to the top of the stirring device. A heating device is arranged inside the shell of the reaction device. The outer peripheral wall of the reaction device shell is provided with a jacket, and a heating medium is injected into the jacket, and the heating medium is optionally heat-conducting oil. An observation window 12 is opened on the shell of the reaction device. The top feed port of the reaction device shell is connected to the discharge end of the second feeding device 7 through the second feeding medium pipe 8, and the mixed material temporarily stored in the buffer storage tank 6 is lifted by the second feeding device 7 and transferred from the second feeding device 7. The feed medium pipe 8 is fed into the reaction device 10 . A discharge medium pipe 14 is externally connected to the bottom of the shell of the reaction device 10. The discharge medium pipe 14 is provided with a finished product outlet control device 13. Optionally, the finished product outlet control device 13 is an electric valve or a solenoid valve. The discharge end of the discharge medium pipe 14 is provided with a flange 15, and the flange 15 is detachably connected to the collecting unit.

The collection unit includes a mobile storage tank 16 and a fixed heat storage tank 19 , and the bottom outlet of the reactor is switched and connected to the mobile storage tank 16 or the fixed heat storage tank 19 through a discharge medium pipe 14 . The inlet end of the stationary heat storage tank 19 is provided with a conveying device 17, and the phase-change heat storage material obtained by the reaction is discharged from the discharge medium pipe 14 and then sent to the stationary heat storage tank 19 through the conveying device 17 for collection and storage. Further, the inlet end of the stationary heat storage tank 19 is connected to the conveying device 17 through the third feeding medium pipe 18 . Specifically, the conveying device 17 is an electric pump.

The reaction unit further includes a temperature control module, which is used for monitoring the reaction temperature in the reaction device 10 and controlling the output power of the heating device. Specifically, the temperature control module includes a temperature measurement device 11 fixed on the inner wall of the shell of the reaction device 10 and a control module electrically connected to the temperature measurement device 11 , the control module is feedback connection with the heating device, and the temperature measurement device 11 is used for monitoring The reaction temperature in the reaction device 10 is output to the control module, and the control module feeds back and controls the output power of the heating device according to the received temperature data. Specifically, the temperature measuring device 11 is a thermocouple. Further, the control module includes an electrically connected control device and a human-machine interface (not shown in the figure), and the control device is feedback-connected to the heating device. The human-computer interaction interface includes an electrically connected display screen and a control panel, the display screen is used to receive and display temperature data, and the control panel is used to realize human-computer interaction and data communication.

Example 1

The present embodiment provides a method for preparing a magnesium nitrate hexahydrate phase change heat storage material by using the system device provided by the specific embodiment, and the method specifically includes the following steps:

(1) Magnesium nitrate hexahydrate, sodium carboxymethyl cellulose and graphite stored in the storage unit are successively sent to the mixing device 4 through the first feeding device 2, and the magnesium nitrate hexahydrate accounts for 85wt% of the total raw material mass, and the carboxymethyl The sodium cellulose accounts for 10wt% of the total mass of the raw materials, and the graphite accounts for 5wt% of the total mass of the raw materials; the above raw materials are mixed by screw stirring for 10min in the mixing device 4 to form a mixed material and flow into the buffer storage tank 6 for temporary storage, and the buffer storage tank 6 temporarily stores The mixed material is sent to the reaction device 10 through the second feeding device 7;

(2) in the reaction device 10, the mixed material is stirred by the stirring device, the rotating speed of the stirring device is 30rad/min, the raw material is heated by the heating device, and the heating temperature of the heating device is set to 90 ℃, and the time of stirring and heating is 3h;

(3) In the process of stirring and heating, the temperature in the reaction device 10 is monitored and controlled by the temperature control module, the operator switches the temperature control module to manual control, and the real-time temperature data output by the temperature measurement device 11 is processed through the human-computer interaction interface. After receiving and displaying, the operator judges and operates the control panel based on the temperature data, and controls the output power of the heating device through the control device until the measured temperature is controlled at 90°C. When the raw material is heated to a completely molten state, it is stirred evenly to form a eutectic mixture and then discharged directly into the mobile storage tank 16 or filled into the stationary heat storage tank 19 via the 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°C, and the subcooling degree is 0.2°C.

Example 2

The present embodiment provides a method for preparing a magnesium nitrate hexahydrate phase change heat storage material by using the system device provided by the specific embodiment, and the method specifically includes the following steps:

(1) Magnesium nitrate hexahydrate, sodium carboxymethyl cellulose and graphite stored in the storage unit are successively sent to the mixing device 4 through the first feeding device 2, and the magnesium nitrate hexahydrate accounts for 87wt% of the total raw material mass, and the thickener It accounts for 9wt% of the total mass of the raw materials, and the thermally conductive filler accounts for 4wt% of the total mass of the raw materials; the above raw materials are stirred and mixed for 20 minutes and then enter the buffer storage tank 6, and the mixed material temporarily stored in the buffer storage tank 6 is sent to the reaction through the second feeding device 7. device 10;

(2) The raw material is stirred by the stirring device in the reaction device 10, the rotating speed of the stirring device is 35 rad/min, the raw material is heated by the heating device, the heating temperature of the heating device is set to 100 ° C, and the stirring and heating time is 2.5 h;

(3) In the process of stirring and heating, the temperature in the reaction device 10 is monitored and controlled by the temperature control module. The operator switches the temperature control module to automatic control, inputs the target temperature range in advance through the control panel, and the temperature measurement device 11 outputs the output The real-time temperature data is sent to the control device, and the control device logically compares the real-time temperature data with the target temperature interval, and controls the output power of the heating device according to the comparison result; the relationship between the comparison result and the control operation is: when the real-time temperature data falls within When the temperature is within the target temperature range, no control operation is performed; when the real-time temperature data is lower than the lower limit of the target temperature range, the heating device is controlled to increase the output power; when the real-time temperature data exceeds the upper limit of the target temperature range, the heating device is controlled to reduce the output power until the measured The temperature was controlled at 100°C. When the raw material is heated to a completely molten state, it is stirred evenly to form a eutectic mixture and then discharged directly into the mobile storage tank 16 or filled into the stationary heat storage tank 19 via the 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°C, and the subcooling degree is 0.5°C.

Example 3

The present embodiment provides a method for preparing a magnesium nitrate hexahydrate phase change heat storage material by using the system device provided by the specific embodiment, and the method specifically includes the following steps:

(1) Magnesium nitrate hexahydrate, sodium carboxymethyl cellulose and graphite stored in the storage unit are successively sent to the mixing device 4 through the first feeding device 2, and the magnesium nitrate hexahydrate accounts for 90wt% of the total raw material mass, and the thickener It accounts for 7wt% of the total mass of the raw materials, and the thermally conductive filler accounts for 3wt% of the total mass of the raw materials; the above raw materials are stirred and mixed for 30 minutes and then enter the buffer storage tank 6, and the mixed material temporarily stored in the buffer storage tank 6 is sent to the reaction through the second feeding device 7. device 10;

(2) In the reaction device 10, the raw materials are stirred by a stirring device, the rotating speed of the stirring device is 40 rad/min, the raw materials are heated by a heating device, the heating temperature of the heating device is set to 100 ° C, and the stirring and heating time is 2h ;

(3) In the process of stirring and heating, the temperature in the reaction device 10 is monitored and controlled by the temperature control module, the operator switches the temperature control module to manual control, and the real-time temperature data output by the temperature measurement device 11 is processed through the human-computer interaction interface. After receiving and displaying, the operator judges and operates the control panel based on the temperature data, and controls the output power of the heating device through the control device until the measured temperature is controlled at 105°C. When the raw material is heated to a completely molten state, it is stirred evenly to form a eutectic mixture and then discharged directly into the mobile storage tank 16 or filled into the stationary heat storage tank 19 via the 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°C, and the subcooling degree is 0.2°C.

Example 4

The present embodiment provides a method for preparing a magnesium nitrate hexahydrate phase change heat storage material by using the system device provided by the specific embodiment, and the method specifically includes the following steps:

(1) Magnesium nitrate hexahydrate, sodium carboxymethyl cellulose and graphite stored in the storage unit are successively sent to the mixing device 4 through the first feeding device 2, and the magnesium nitrate hexahydrate accounts for 95wt% of the total raw material mass, and the thickener It accounts for 3wt% of the total mass of the raw materials, and the thermally conductive filler accounts for 2wt% of the total mass of the raw materials; the above raw materials are stirred and mixed for 40min and then enter the buffer storage tank 6, and the mixed material temporarily stored in the buffer storage tank 6 is sent to the reaction through the second feeding device 7 device 10;

(2) The raw material is stirred by the stirring device in the reaction device 10, the rotating speed of the stirring device is 50 rad/min, the raw material is heated by the heating device, the heating temperature of the heating device is set to 110 ° C, and the stirring and heating time is 1.5 h;

(3) In the process of stirring and heating, the temperature in the reaction device 10 is monitored and controlled by the temperature control module. The operator switches the temperature control module to automatic control, inputs the target temperature range in advance through the control panel, and the temperature measurement device 11 outputs the output The real-time temperature data is sent to the control device, and the control device logically compares the real-time temperature data with the target temperature interval, and controls the output power of the heating device according to the comparison result; the relationship between the comparison result and the control operation is: when the real-time temperature data falls within When the temperature is within the target temperature range, no control operation is performed; when the real-time temperature data is lower than the lower limit of the target temperature range, the heating device is controlled to increase the output power; when the real-time temperature data exceeds the upper limit of the target temperature range, the heating device is controlled to reduce the output power until the measured The temperature was controlled at 110°C. When the raw material is heated to a completely molten state, it is stirred evenly to form a eutectic mixture and then discharged directly into the mobile storage tank 16 or filled into the stationary heat storage tank 19 via the 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°C, and the subcooling degree is 0.3°C.

Example 5

The present embodiment provides a method for preparing a magnesium nitrate hexahydrate phase change heat storage material by using the system device provided by the specific embodiment, and the method specifically includes the following steps:

(1) Magnesium nitrate hexahydrate, sodium carboxymethyl cellulose and graphite stored in the storage unit are successively sent to the mixing device 4 through the first feeding device 2, and the magnesium nitrate hexahydrate accounts for 98wt% of the total raw material mass, and the thickener It accounts for 1wt% of the total mass of the raw materials, and the thermally conductive filler accounts for 1wt% of the total mass of the raw materials; the above raw materials are stirred and mixed for 50min and then enter the buffer storage tank 6, and the mixed material temporarily stored in the buffer storage tank 6 is sent to the reaction through the second feeding device 7 device 10;

(1) In the reaction device 10, the raw materials are stirred by a stirring device, the rotation speed of the stirring device is 60 rad/min, the raw materials are heated by a heating device, the heating temperature of the heating device is set to 120 ° C, and the stirring and heating time is 1h ;

(3) In the process of stirring and heating, the temperature in the reaction device 10 is monitored and controlled by the temperature control module, the operator switches the temperature control module to manual control, and the real-time temperature data output by the temperature measurement device 11 is processed through the human-computer interaction interface. After receiving and displaying, the operator judges and operates the control panel based on the temperature data, and controls the output power of the heating device through the control device until the measured temperature is controlled at 120°C. When the raw material is heated to a completely molten state, it is stirred evenly to form a eutectic mixture and then discharged directly into the mobile storage tank 16 or filled into the stationary heat storage tank 19 via the 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°C, and the subcooling degree is 0.4°C.

The applicant declares that the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should Changes or substitutions that can be easily conceived within the technical scope all fall within the protection scope and disclosure scope 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.

Images