Heat conduction oil device capable of recycling waste heat, oil supply method and multi-tank operation system

Abstract

The invention discloses a heat conduction oil device capable of recycling waste heat, an oil supply method and a multi-tank operation system, belongs to the technical field of energy recovery, and aims to solve the problem of preheating waste in the heating and cooling processes of an autoclave in the prior art. The heat conduction oil device comprises a heat storage tank, a cold storage tank, a heater and a cooler, heat conduction oil inlets of the heat storage tank and the cold storage tank are connected with a heat conduction oil outlet of a heat exchanger, and a heat conduction oil outlet of the heat storage tank is connected with a heat conduction oil inlet of the heat exchanger of an autoclave through the heater. And a heat-conducting oil outlet of the cold storage tank is connected with a heat-conducting oil inlet of the heat exchanger of the autoclave through a cooler. The device can be used for heating and cooling the autoclave.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy recovery, and particularly relates to a waste heat recycling heat conducting oil device, a heat conducting oil supply method and a multi-tank operation system. BACKGROUND

[0002] As the core process equipment for hot pressing of composite material components, hot pressing tanks are widely used in the fields of aerospace and high-end manufacturing, and need to provide a working environment of 80-450 DEG C high temperature and 0.3-5 MPa high pressure for curing of composite materials, and typical processes include three stages of temperature rising, constant temperature curing and temperature falling and pressure releasing, as shown in Figure 1 To realize the environment regulation, some existing hot pressing tanks adopt a heat conducting oil system, which includes a heat conducting oil storage tank, a pipeline electric heater for heating the heat conducting oil in the temperature rising stage, a heat exchanger in the tank for heat exchange with air in the tank to realize temperature rising, and a cooling water heat exchanger for cooling the heat conducting oil after absorbing heat in the tank in the temperature falling stage, and finally the heat is discharged into the environment through a cooling tower.

[0003] However, there is a significant energy waste problem in the above temperature rising and falling processes: as a high energy consumption device, the super large hot pressing tank uses several megawatts of power in the heating stage, and the heating energy is converted into internal energy of the tank structure and internal equipment except for driving the curing reaction, and in the temperature falling stage, this part of energy is directly discharged through the cooling system, which not only causes energy waste, but also may have adverse effects on the surrounding environment. SUMMARY

[0004] In view of the above analysis, the present application aims to provide a waste heat recycling heat conducting oil device, a heat conducting oil supply method and a multi-tank operation system to solve the problem of preheating waste in the temperature rising and falling processes of the existing hot pressing tank.

[0005] The present application provides a waste heat recycling heat conducting oil device, which comprises a heat storage tank, a heat storage tank, a heater and a cooler, the heat conducting oil inlet of the heat storage tank and the heat storage tank is connected with the heat conducting oil outlet of the heat exchanger, the heat conducting oil outlet of the heat storage tank is connected with the heat conducting oil inlet of the heat exchanger of the hot pressing tank through the heater, and the heat conducting oil outlet of the heat storage tank is connected with the heat conducting oil inlet of the heat exchanger of the hot pressing tank through the cooler.

[0006] Further, the heat conducting oil device further comprises an oil outlet connecting pipe group.

[0007] Further, the oil outlet connecting pipe group comprises an oil outlet main pipe, a heat storage oil inlet branch pipe, a cold storage oil inlet branch pipe, a heat storage liquid inlet valve and a cold storage liquid inlet valve, the heat conducting oil outlet of the heat exchanger is connected with the heat conducting oil inlet of the oil outlet main pipe, the heat conducting oil outlet of the oil outlet main pipe is connected with the heat conducting oil inlets of the heat storage oil inlet branch pipe and the cold storage oil inlet branch pipe, the heat conducting oil outlet of the heat storage oil inlet branch pipe is connected with the heat conducting oil inlet of the heat storage storage tank, the heat conducting oil outlet of the cold storage oil inlet branch pipe is connected with the heat conducting oil inlet of the cold storage storage tank, the heat storage liquid inlet valve is arranged on the heat storage oil inlet branch pipe, and the cold storage liquid inlet valve is arranged on the cold storage oil inlet branch pipe.

[0008] Further, the heat conducting oil device further comprises an oil inlet connecting pipe group.

[0009] Further, the oil inlet connecting pipe group comprises an oil inlet main pipe, a heating oil outlet branch pipe, a cooling oil outlet branch pipe, a heating oil outlet valve and a cooling oil outlet valve, the heat conducting oil outlets of the heating oil outlet branch pipe and the cooling oil outlet branch pipe are connected with the heat conducting oil inlet of the oil inlet main pipe, the heat conducting oil outlet of the oil inlet main pipe is connected with the heat conducting oil inlet of the heat exchanger, the heating oil outlet valve is arranged on the heating oil outlet branch pipe, and the cooling oil outlet valve is arranged on the cooling oil outlet branch pipe.

[0010] Further, the heat conducting oil device further comprises an intermediate connecting pipe group.

[0011] Further, the intermediate connecting pipe group comprises an intermediate main pipe, a heat storage oil outlet branch pipe, a cold storage oil outlet branch pipe, a heating oil inlet branch pipe, a cooling oil inlet branch pipe, a heat storage oil outlet valve and a cold storage oil outlet valve, the heat conducting oil outlet of the heat storage storage tank is connected with the heat conducting oil inlet of the heat storage oil outlet branch pipe, the heat conducting oil outlet of the heat storage oil outlet branch pipe is connected with the heat conducting oil inlet of the intermediate main pipe, the heat conducting oil outlet of the cold storage storage tank is connected with the heat conducting oil inlet of the cold storage oil outlet branch pipe, the heat conducting oil outlet of the cold storage oil outlet branch pipe is connected with the heat conducting oil inlet of the intermediate main pipe, the heat conducting oil outlet of the intermediate main pipe is connected with the heat conducting oil inlets of the heating oil inlet branch pipe and the cooling oil inlet branch pipe, the heat conducting oil outlet of the heating oil inlet branch pipe is connected with the heat conducting oil inlet of the heater, the heat conducting oil outlet of the cooling oil inlet branch pipe is connected with the heat conducting oil inlet of the cooler, the heat storage oil outlet valve is arranged on the heat storage oil outlet branch pipe, and the cold storage oil outlet valve is arranged on the cold storage oil outlet branch pipe.

[0012] The application also provides a waste heat recycling and utilizing oil supply method, which adopts the above waste heat recycling and utilizing heat conducting oil device, and the heat supply method comprises the following steps.

[0013] Step 1: the first batch of composite material components are located in the autoclave, the heat conducting oil outlet of the heat storage storage tank is communicated with the heat conducting oil inlet of the heat exchanger, the heat conducting oil outlet of the cold storage storage tank is disconnected with the heat conducting oil inlet of the heat exchanger, the heat conducting oil outlet of the heater is communicated with the heat conducting oil inlet of the heat exchanger, and the heat conducting oil outlet of the cooler is disconnected with the heat conducting oil inlet of the heat exchanger.

[0014] Step 2: judging whether the temperature difference between the temperature of the heat storage tank and the temperature required by the autoclave is above a temperature difference threshold (for example, the temperature difference threshold is 10℃), if yes, the heat conducting oil in the heat storage tank is directly supplied into the heat exchanger of the autoclave to heat and keep warm the composite material member in the autoclave; if no, the heat conducting oil in the heat storage tank is heated by the heater to make the temperature difference between the temperature of the heat storage tank and the temperature required by the autoclave be above the temperature difference threshold, and then the heat conducting oil is supplied into the heat exchanger of the autoclave to heat and keep warm the composite material member in the autoclave;

[0015] Step 3: after the heating and keeping warm process of the composite material member is completed, the heat conducting oil outlet of the heater is disconnected from the heat conducting oil inlet of the heat exchanger, the heat conducting oil outlet of the cooler is connected to the heat conducting oil inlet of the heat exchanger, and the autoclave enters the cooling process;

[0016] Step 4: the heat conducting oil in the cold storage tank is cooled by the cooler and then supplied into the heat exchanger of the autoclave to cool the composite material member, and the high-temperature heat conducting oil in the heat exchanger is supplied into the heat storage tank for storage, after the heat storage tank stores the heat conducting oil, the heat conducting oil outlet of the heat exchanger is disconnected from the heat conducting oil inlet of the heat storage tank, the heat conducting oil outlet of the cooler is disconnected from the heat conducting oil inlet of the heat exchanger, and the autoclave is cooled by the cooler of the heat conducting oil system to reach the set temperature, and the curing process of the first batch of composite material members is completed;

[0017] Step 5: the first batch of composite material members is taken out, the next batch of composite material members is put into the autoclave, the heat conducting oil inlet of the cold storage tank is connected to the heat conducting oil outlet of the heat exchanger, the heat conducting oil outlet of the heater is connected to the heat conducting oil inlet of the heat exchanger, the high-temperature heat conducting oil stored in the heat storage tank is heated by the heater and then supplied into the heat exchanger to heat and keep warm the next batch of composite material members, and the low-temperature heat conducting oil in the heat exchanger is supplied into the cold storage tank for storage.

[0018] The application further provides a multi-tank operation system comprising an autoclave and the heat conducting oil device for waste heat recovery.

[0019] Further, a plurality of autoclaves are connected to one heat storage tank and one cold storage tank.

[0020] Compared with the prior art, the application can achieve at least one of the following beneficial effects:

[0021] A) The waste heat recycling heat conducting oil device provided by the application can replace the single heat conducting oil storage tank in the original heat conducting oil system with the heat storage tank and the cold storage tank in the embodiment, so that the heat in the high-temperature heat conducting oil discharged at the initial cooling stage of the composite material component can be avoided from being directly discharged to the environment through the cooling system, the heat utilization rate is improved, the direct loss of the cold energy in the low-temperature heat conducting oil discharged at the initial heating stage of the composite material component can be avoided, the cold energy utilization rate is improved, the waste heat in the heat conducting oil system is recycled, the energy utilization efficiency is improved, the energy waste is reduced, and the adverse effects on the surrounding environment are reduced.

[0022] B) The waste heat recycling heat conducting oil device provided by the application can replace the single heat conducting oil storage tank in the original heat conducting oil system with the heat storage tank and the cold storage tank in the embodiment, so that the heat in the high-temperature heat conducting oil discharged at the initial cooling stage of the composite material component can be avoided from being directly discharged to the environment through the cooling system, the heat utilization rate is improved, the direct loss of the cold energy in the low-temperature heat conducting oil discharged at the initial heating stage of the composite material component can be avoided, the cold energy utilization rate is improved, the waste heat in the heat conducting oil system is recycled, the energy utilization efficiency is improved, the energy waste is reduced, and the adverse effects on the surrounding environment are reduced.

[0023] C) The waste heat recycling heat conducting oil device provided by the application can replace the single heat conducting oil storage tank in the original heat conducting oil system with the heat storage tank and the cold storage tank in the embodiment, so that the heat in the high-temperature heat conducting oil discharged at the initial cooling stage of the composite material component can be avoided from being directly discharged to the environment through the cooling system, the heat utilization rate is improved, the direct loss of the cold energy in the low-temperature heat conducting oil discharged at the initial heating stage of the composite material component can be avoided, the cold energy utilization rate is improved, the waste heat in the heat conducting oil system is recycled, the energy utilization efficiency is improved, the energy waste is reduced, and the adverse effects on the surrounding environment are reduced.

[0024] In the application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the application will be described in the subsequent description, and some advantages will become apparent from the description or be understood by implementing the application. The purposes and other advantages of the application can be realized and obtained from the contents specifically indicated in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0026] Figure 1 Temperature working condition curve of the autoclave in the prior art;

[0027] Figure 2 Structure schematic view of the waste heat recycling heat conducting oil device provided by the embodiment one of the application;

[0028] Figure 3 Structure schematic view of the mixing barrel in the waste heat recycling heat conducting oil device provided by the embodiment one of the application.

[0029] REFERENCE NUMERALS

[0030] 1-accumulator tank; 2-accumulator tank; 3-heater; 4-cooler; 5-hot press tank; 6-heat exchanger; 7-accumulator air pressure regulating valve; 8-accumulator air pressure regulating valve; 9-linkage pipeline; 10-oil outlet main pipeline; 11-accumulator oil inlet branch pipeline; 12-accumulator oil inlet branch pipeline; 13-accumulator liquid inlet valve; 14-accumulator liquid inlet valve; 15-oil inlet main pipeline; 16-heating oil outlet branch pipeline; 17-cooling oil outlet branch pipeline; 18-heating oil outlet valve; 19-cooling oil outlet valve; 20-main delivery pump; 21-intermediate main pipeline; 22-accumulator oil outlet branch pipeline; 23-accumulator oil outlet branch pipeline; 24-heating oil inlet branch pipeline; 25-cooling oil inlet branch pipeline; 26-accumulator oil outlet valve; 27-accumulator oil outlet valve; 28-mixing pipeline; 29-first temperature regulating valve; 30-second temperature regulating valve; 31-first scroll plate; 32-second scroll plate; 33-backflow pipeline; 34-backflow check valve. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in detail below with reference to the drawings, which constitute a part of this application, and are used to explain the principles of the application, but are not used to limit the scope of the application.

[0032] Embodiment one

[0033] The present embodiment provides a waste heat recycling heat conducting oil device, referring to Figure 2 , comprising an accumulator tank 1, an accumulator tank 2, a heater 3 and a cooler 4, the heat conducting oil inlet of the accumulator tank 1 and the accumulator tank 2 is connected with the heat conducting oil outlet of the heat exchanger 6, the heat conducting oil outlet of the accumulator tank 1 is connected with the heat conducting oil inlet of the heat exchanger 6 of the hot press tank 5 through the heater 3, and the heat conducting oil outlet of the accumulator tank 2 is connected with the heat conducting oil inlet of the heat exchanger 6 of the hot press tank 5 through the cooler 4.

[0034] The oil supply method based on the above heat conducting oil device involves the hot pressing of two batches of composite material components, namely the first batch and the next batch, and specifically, the oil supply method comprises the following steps:

[0035] Step 1: the composite material components of the first batch are located in the hot press tank 5, the heat conducting oil outlet of the accumulator tank 1 is communicated with the heat conducting oil inlet of the heat exchanger 6, the heat conducting oil outlet of the accumulator tank 2 is disconnected with the heat conducting oil inlet of the heat exchanger 6, the heat conducting oil outlet of the heater 3 is communicated with the heat conducting oil inlet of the heat exchanger 6, and the heat conducting oil outlet of the cooler 4 is disconnected with the heat conducting oil inlet of the heat exchanger 6.

[0036] Step 2: the heat conducting oil in the accumulator tank 1 is heated by the heater 3 and then supplied into the heat exchanger 6 of the hot press tank 5 to heat and keep warm the composite material components in the hot press tank 5.

[0037] Step 3: After the heat preservation of the composite component is completed, the heat conduction oil outlet of the heater 3 is disconnected from the heat conduction oil inlet of the heat exchanger 6, and the heat conduction oil outlet of the cooler 4 is connected to the heat conduction oil inlet of the heat exchanger 6;

[0038] Step 4: The heat conduction oil in the cold storage tank 2 is cooled by the cooler 4 and then supplied to the heat exchanger 6 of the hot pressing tank 5 to cool the composite component, the high-temperature heat conduction oil in the heat exchanger 6 is stored in the heat storage tank 1, the heat conduction oil outlet of the heat exchanger 6 is disconnected from the heat conduction oil inlet of the heat storage tank 1, the heat conduction oil outlet of the cooler 4 is disconnected from the heat conduction oil inlet of the heat exchanger 6, and the hot pressing of the first batch of composite components is completed.

[0039] Step 5: The first batch of composite components is removed, the next batch of composite components is placed in the hot pressing tank 5, the heat conduction oil inlet of the cold storage tank 2 is connected to the heat conduction oil outlet of the heat exchanger 6, the heat conduction oil outlet of the heater 3 is connected to the heat conduction oil inlet of the heat exchanger 6, the high-temperature heat conduction oil stored in the heat storage tank 1 is heated by the heater 3 and then supplied to the heat exchanger 6 to heat and preserve the next batch of composite components, and the low-temperature heat conduction oil in the heat exchanger 6 is stored in the cold storage tank 2.

[0040] Compared with the prior art, the waste heat recovery heat conduction oil device provided by the embodiment replaces the single heat conduction oil tank in the original heat conduction oil system with the heat storage tank 1 and the cold storage tank 2, which can avoid the direct discharge of the heat in the high-temperature heat conduction oil discharged at the initial stage of the cooling of the composite component to the environment through the cooling system, improve the utilization rate of heat, avoid the direct loss of the cold in the low-temperature heat conduction oil discharged at the initial stage of the heating of the composite component, improve the utilization rate of cold, realize the recovery and utilization of waste heat in the heat conduction oil system, improve the energy utilization efficiency, reduce energy waste, and reduce the adverse effects on the surrounding environment.

[0041] Specifically, at the initial stage of heating, the low-temperature heat conduction oil in the heat exchanger 6 is stored in the cold storage tank 2 for the cooling of the next batch of composite components, and at the same time, the high-temperature heat conduction oil discharged during the cooling of the first batch is stored in the heat storage tank 1 to heat and preserve the composite components in the hot pressing tank 5, thereby reducing the energy consumption of directly heating the normal-temperature heat conduction oil by the heater 3.

[0042] At the initial stage of cooling, the high-temperature heat conduction oil in the heat exchanger 6 is stored in the heat storage tank 1 for the heating and preservation of the next batch of composite components, and at the same time, the low-temperature heat conduction oil discharged during the heating of the first batch is stored in the cold storage tank 2 to cool the composite components, thereby reducing the energy consumption of directly cooling the normal-temperature heat conduction oil by the cooler 4.

[0043] It is worth noting that when the heat conducting oil in the heat storage tank 1 is discharged for heating the heat exchanger 6, nitrogen needs to be introduced into the heat storage tank 1, and when the heat conducting oil is supplied into the heat storage tank 1, the nitrogen in the heat storage tank 1 may cause the air pressure in the heat storage tank 1 to be too high, affecting the smooth supply of the heat conducting oil, therefore, the above-mentioned waste heat recovery and utilization heat conducting oil device further comprises a heat storage air pressure regulating valve 7 arranged on the heat storage tank 1, during the process of supplying the heat conducting oil into the heat storage tank 1, the heat storage air pressure regulating valve 7 is opened to discharge the nitrogen in the heat storage tank 1, ensuring that the heat conducting oil can be smoothly supplied into the heat storage tank 1, avoiding affecting the normal operation of the whole system due to excessive air pressure.

[0044] Similarly, the cold storage tank 2 may also face similar air pressure problems during the process of supplying the heat conducting oil, therefore, the above-mentioned waste heat recovery and utilization heat conducting oil device further comprises a cold storage air pressure regulating valve 8 arranged on the cold storage tank 2, which is opened when the heat conducting oil is supplied into the cold storage tank 2 to maintain the air pressure balance in the cold storage tank 2 and ensure that the heat conducting oil can be smoothly supplied into the cold storage tank 2.

[0045] In order to realize the linkage of the air pressure in the cold storage tank 2 and the heat storage tank 1, the above-mentioned waste heat recovery and utilization heat conducting oil device further comprises a linkage pipeline 9, the heat storage air pressure regulating valve 7 is connected with the cold storage air pressure regulating valve 8 through the linkage pipeline 9. This is because the flow of the heat conducting oil in the cold storage tank 2 and the heat storage tank 1 is opposite, that is, when the heat conducting oil is supplied into the cold storage tank 2, the heat conducting oil in the heat storage tank 1 flows out, or when the heat conducting oil is supplied into the heat storage tank 1, the heat conducting oil in the cold storage tank 2 flows out, correspondingly, the air pressure changes in the heat storage tank 1 and the cold storage tank 2 are also opposite, the heat storage air pressure regulating valve 7 and the cold storage air pressure regulating valve 8 are communicated through the linkage pipeline 9, the air pressure change of one tank is used to assist the adjustment of the air pressure of the other tank, so as to more effectively maintain the air pressure balance of the whole system. For example, when the heat conducting oil is supplied into the heat storage tank 1, causing the internal air pressure to rise, the heat storage air pressure regulating valve 7 is opened, part of the nitrogen flows to the cold storage tank 2 through the linkage pipeline 9, at this time, if the heat conducting oil flows out of the cold storage tank 2, causing the air pressure to drop, the flowing nitrogen can supplement the air pressure, and vice versa.

[0046] It can be understood that in order to realize the connection and disconnection of the heat conducting oil outlet of the heat exchanger 6 and the heat conducting oil inlets of the heat storage tank 1 and the cold storage tank 2, the above-mentioned waste heat recovery and utilization heat conducting oil device further comprises an oil outlet connecting pipe group.

[0047] Specifically, the oil outlet connecting pipe group comprises an oil outlet main pipe 10, a heat storage oil inlet branch pipe 11, a cold storage oil inlet branch pipe 12, a heat storage liquid inlet valve 13 and a cold storage liquid inlet valve 14. The heat transfer oil outlet of the heat exchanger 6 is connected with the heat transfer oil inlet of the oil outlet main pipe 10. The heat transfer oil outlet of the oil outlet main pipe 10 is connected with the heat transfer oil inlets of the heat storage oil inlet branch pipe 11 and the cold storage oil inlet branch pipe 12. The heat transfer oil outlet of the heat storage oil inlet branch pipe 11 is connected with the heat transfer oil inlet of the heat storage tank 1. The heat transfer oil outlet of the cold storage oil inlet branch pipe 12 is connected with the heat transfer oil inlet of the cold storage tank 2. The heat storage liquid inlet valve 13 is arranged on the heat storage oil inlet branch pipe 11. The cold storage liquid inlet valve 14 is arranged on the cold storage oil inlet branch pipe 12. In this way, by controlling the opening and closing of the heat storage liquid inlet valve 13 and the cold storage liquid inlet valve 14, the connection and disconnection between the heat transfer oil outlet of the heat exchanger 6 and the heat transfer oil inlet of the heat storage tank 1 or the cold storage tank 2 can be realized. When heating is needed, the cold storage liquid inlet valve 14 is opened and the heat storage liquid inlet valve 13 is closed, so that the low-temperature heat transfer oil in the heat exchanger 6 flows into the cold storage tank 2 for storage. When cooling is needed, the heat storage liquid inlet valve 13 is opened and the cold storage liquid inlet valve 14 is closed, so that the high-temperature heat transfer oil in the heat exchanger 6 flows into the heat storage tank 1 for storage.

[0048] Correspondingly, in order to realize the connection and disconnection between the heat transfer oil outlet of the heater 3 and the heat transfer oil outlet of the cooler 4 and the heat transfer oil inlet of the heat exchanger 6, the above-mentioned waste heat recovery and utilization heat transfer oil device further comprises an oil inlet connecting pipe group.

[0049] Specifically, the oil inlet connecting pipe group comprises an oil inlet main pipe 15, a heating oil outlet branch pipe 16, a cooling oil outlet branch pipe 17, a heating oil outlet valve 18 and a cooling oil outlet valve 19. The heat transfer oil outlets of the heating oil outlet branch pipe 16 and the cooling oil outlet branch pipe 17 are connected with the heat transfer oil inlet of the oil inlet main pipe 15. The heat transfer oil outlet of the oil inlet main pipe 15 is connected with the heat transfer oil inlet of the heat exchanger 6. The heating oil outlet valve 18 is arranged on the heating oil outlet branch pipe 16. The cooling oil outlet valve 19 is arranged on the cooling oil outlet branch pipe 17. In this way, by controlling the opening and closing of the heating liquid inlet valve and the cooling liquid inlet valve, the connection and disconnection between the heat transfer oil outlet of the heater 3 and the heat transfer oil outlet of the cooler 4 and the heat transfer oil inlet of the heat exchanger 6 can be realized. When heating is needed, the heating liquid inlet valve is opened and the cooling liquid inlet valve is closed, so that the high-temperature heat transfer oil after being heated by the heater 3 flows into the heat exchanger 6 to heat the composite material member. When cooling is needed, the cooling liquid inlet valve is opened and the heating liquid inlet valve is closed, so that the low-temperature heat transfer oil after being cooled by the cooler 4 flows into the heat exchanger 6 to cool the composite material member.

[0050] In order to provide the circulating power of the heat conducting oil in the heat conducting oil device, the heat conducting oil device further comprises a main conveying pump 20 arranged on the oil inlet main pipe 15. Through the driving of the main conveying pump 20, the heat conducting oil can be efficiently circulated between the heat storage tank 1, the heat storage tank 2, the heater 3, the cooler 4 and the heat exchanger 6 of the hot tank 5, so as to ensure the stable and reliable operation of the whole heat recovery device.

[0051] In order to realize the connection and disconnection of the heat conducting oil outlet of the heat storage tank 1 and the heat conducting oil inlet of the heater 3 and the heat conducting oil outlet of the heat storage tank 2 and the heat conducting oil inlet of the cooler 4, the heat conducting oil device further comprises an intermediate connecting pipe group.

[0052] Specifically, the intermediate connecting pipe group comprises an intermediate main pipe 21, a heat storage oil outlet branch pipe 22, a heat storage oil outlet branch pipe 23, a heating oil inlet branch pipe 24, a cooling oil inlet branch pipe 25, a heat storage oil outlet valve 26 and a heat storage oil outlet valve 27. The heat conducting oil outlet of the heat storage tank 1 is connected with the heat conducting oil inlet of the heat storage oil outlet branch pipe 22, the heat conducting oil outlet of the heat storage oil outlet branch pipe 22 is connected with the heat conducting oil inlet of the intermediate main pipe 21, the heat conducting oil outlet of the heat storage tank 2 is connected with the heat conducting oil inlet of the heat storage oil outlet branch pipe 23, the heat conducting oil outlet of the heat storage oil outlet branch pipe 23 is connected with the heat conducting oil inlet of the intermediate main pipe 21, the heat conducting oil outlet of the intermediate main pipe 21 is connected with the heat conducting oil inlet of the heating oil inlet branch pipe 24 and the cooling oil inlet branch pipe 25, the heat conducting oil outlet of the heating oil inlet branch pipe 24 is connected with the heat conducting oil inlet of the heater 3, the heat conducting oil outlet of the cooling oil inlet branch pipe 25 is connected with the heat conducting oil inlet of the cooler 4, the heat storage oil outlet valve 26 is arranged on the heat storage oil outlet branch pipe 22, and the heat storage oil outlet valve 27 is arranged on the heat storage oil outlet branch pipe 23. In this way, by controlling the opening and closing of the heat storage oil outlet valve 26 and the heat storage oil outlet valve 27, the connection and disconnection of the heat conducting oil outlet of the heat storage tank 1 and the heat conducting oil inlet of the heater 3 and the heat conducting oil outlet of the heat storage tank 2 and the heat conducting oil inlet of the cooler 4 can be realized. When it is needed to use the high-temperature heat conducting oil in the heat storage tank 1 for heating, the heat storage oil outlet valve 26 is opened and the heat storage oil outlet valve 27 is closed, so that the high-temperature heat conducting oil in the heat storage tank 1 flows into the heater 3 for further heating and then is supplied into the hot tank 5; when it is needed to use the low-temperature heat conducting oil in the heat storage tank 2 for cooling, the heat storage oil outlet valve 27 is opened and the heat storage oil outlet valve 26 is closed, so that the low-temperature heat conducting oil in the heat storage tank 2 flows into the cooler 4 for cooling and then is supplied into the hot tank 5.

[0053] Based on the structure of the oil outlet connecting pipe group, the oil inlet connecting pipe group and the intermediate connecting pipe group, in order to realize the adjustable temperature of the heat conducting oil supplied into the heat exchanger 6, the heat conducting oil device for waste heat recovery further comprises a mixing pipeline 28, a first temperature adjusting valve 29 arranged on the mixing pipeline 28 and a second temperature adjusting valve 30 arranged on the oil outlet main pipe 10. The heat conducting oil inlet of the mixing pipeline 28 is connected with the oil outlet main pipe 10, the heat conducting oil outlet of the mixing pipeline 28 is connected with the oil inlet main pipe 15, and the second temperature adjusting valve 30 is arranged behind the connection between the mixing pipeline 28 and the oil outlet main pipe 10 in the flow direction of the heat conducting oil. In this way, the temperature of the heat conducting oil supplied into the heat exchanger 6 can be flexibly adjusted through the arrangement of the mixing pipeline 28 and the opening degrees of the first temperature adjusting valve 29 and the second temperature adjusting valve 30. Specifically, during the cooling process of the composite material component, when it is necessary to appropriately increase the temperature of the heat conducting oil supplied into the heat exchanger 6, the opening degree of the second temperature adjusting valve 30 can be reduced, and the opening degree of the first temperature adjusting valve 29 can be increased, so that part of the high-temperature heat conducting oil flowing out of the oil outlet main pipe 10 is directly mixed with the low-temperature heat conducting oil in the oil inlet main pipe 15 through the mixing pipeline 28, so as to increase the overall temperature of the mixed heat conducting oil, and then the mixed heat conducting oil is supplied into the heat exchanger 6. Conversely, during the heating and heat preservation process of the composite material component, when it is necessary to appropriately reduce the temperature of the heat conducting oil supplied into the heat exchanger 6, the opening degree of the first temperature adjusting valve 29 can be increased, and the opening degree of the second temperature adjusting valve 30 can be reduced, so as to increase the flow of the low-temperature heat conducting oil through the mixing pipeline 28, reduce the temperature of the mixed heat conducting oil, and then supply the mixed heat conducting oil into the heat exchanger 6. Through this flexible adjustment mode, the temperature of the heat conducting oil in the heat exchanger 6 can be accurately controlled according to the requirements of the hot pressing process of different batches of composite material components, the hot pressing process is further optimized, and the product quality and production efficiency are improved. At the same time, this temperature adjusting mode does not need to additionally set complex heating or cooling equipment, but can be realized only by simple control of the opening degrees of the valves, so as to reduce the operation cost and operation difficulty of the device, and improve the practicability and economy of the whole waste heat recovery device.

[0054] It should be noted that there is mixing of high-temperature heat conducting oil and low-temperature heat conducting oil at the connection between the mixing pipeline 28 and the oil inlet main pipe 15. In order to improve the mixing effect of the high-temperature heat conducting oil and the low-temperature heat conducting oil, the heat conducting oil device for waste heat recovery further comprises a mixing cylinder arranged in the oil inlet main pipe 15. The mixing cylinder is located in front of the connection between the mixing pipeline 28 and the oil inlet main pipe 15 in the flow direction of the heat conducting oil. It should be noted that the axis of the mixing pipeline 28 is perpendicular to the axis of the oil inlet main pipe 15, and the two form a T-shaped pipeline.

[0055] Specifically, referring to Figure 3The mixing barrel comprises a first scroll plate 31 and a second scroll plate 32 which is sleeved with the first scroll plate 31 layer by layer, and a gap is formed between the two plates, forming two scroll channels which converge on the axis of the mixing barrel. The shape of the mixing barrel is a barrel which is connected by a conical part and a cylindrical part. The position of the conical part corresponds to the connection between the mixing pipeline 28 and the main oil inlet pipe 15, that is, among the two adjacent layers of the first scroll plate 31 and the second scroll plate 32, one in the inner layer protrudes from the other in the outer layer, thereby forming a conical part which protrudes layer by layer. The end of the cylindrical part away from the conical part serves as the outlet of the heat conducting oil, and the tip of the conical part faces the direction of the flow of the heat conducting oil.

[0056] For example, the heat conducting oil in the mixing pipeline 28 is low temperature heat conducting oil, and the heat conducting oil in the main oil inlet pipe 15 is high temperature heat conducting oil.

[0057] The low temperature heat conducting oil flowing out of the outlet of the mixing pipeline 28 flows into the gap between the first scroll plate 31 and the second scroll plate 32 layer by layer from one side of the conical part along the axial direction perpendicular to the conical part, and is divided into multiple layers to swirl in the gap. The high temperature heat conducting oil flowing in the main oil inlet pipe 15 flows into the gap between the first scroll plate 31 and the second scroll plate 32 along the axial direction of the conical part, and is divided into multiple layers to mix layer by layer in the gap under the driving of the swirling low temperature heat conducting oil, obtaining swirling mixed heat conducting oil.

[0058] In this way, the mixing barrel with such a structure can achieve more sufficient mixing effect in a shorter distance on the one hand, thereby further improving the mixing effect of the high temperature heat conducting oil and the low temperature heat conducting oil. On the other hand, since one in the inner layer protrudes from the other in the outer layer among the two adjacent layers of the first scroll plate 31 and the second scroll plate 32, thereby forming a conical part which protrudes layer by layer, the low temperature heat conducting oil can flow layer by layer from the gaps of multiple first scroll plates 31 and second scroll plates 32, and flow out of the mixing barrel uniformly from various gaps such as the center and the edge of the mixing barrel. Even if it swirls, a low pressure area will not be formed at the center, thereby further reducing the pressure loss of the heat conducting oil.

[0059] In order to ensure the stability of the delivery pump, the delivery flow rate remains unchanged, but if there is mixing during the temperature adjustment process, it may cause too much heat conducting oil to be supplied to the heat exchanger 6. Therefore, the heat conducting oil device for waste heat recovery further comprises a return pipeline 33 and a return one-way valve 34 arranged on the return pipeline 33. The heat conducting oil inlet of the return pipeline 33 is connected with the oil inlet main pipeline 15, and the heat conducting oil outlet of the return pipeline 33 is connected with the intermediate main pipeline 21. In this way, when too much heat conducting oil is supplied to the heat exchanger 6, the excess heat conducting oil can flow back to the intermediate main pipeline 21 through the return pipeline 33, and the return one-way valve 34 can prevent the heat conducting oil from flowing backward, thereby ensuring the stable operation of the entire system. It should be noted that the arrangement of the return pipeline 33 can avoid problems such as abnormal system pressure or heat conducting oil overflow caused by too much heat conducting oil, thereby further improving the reliability and safety of the waste heat recovery device.

[0060] Embodiment Two

[0061] The embodiment provides a heat conducting oil supply method for waste heat recovery, which adopts the heat conducting oil device for waste heat recovery provided in Embodiment One. The heat conducting oil supply method comprises the following steps:

[0062] Step 1: The first batch of composite material components is located in the autoclave, the heat conducting oil outlet of the heat storage tank 1 is communicated with the heat conducting oil inlet of the heat exchanger 6, the heat conducting oil outlet of the cold storage tank 2 is disconnected with the heat conducting oil inlet of the heat exchanger 6, the heat conducting oil outlet of the heater 3 is communicated with the heat conducting oil inlet of the heat exchanger 6, and the heat conducting oil outlet of the cooler 4 is disconnected with the heat conducting oil inlet of the heat exchanger 6.

[0063] Step 2: It is judged whether the difference between the temperature of the heat conducting oil in the heat storage tank 1 and the required temperature of the autoclave 5 is above a temperature difference threshold value (for example, the temperature difference threshold value is 10℃). If yes, the heat conducting oil in the heat storage tank 1 is directly supplied to the heat exchanger of the autoclave 5 to heat and keep warm the composite material components in the autoclave 5. If no, the heat conducting oil in the heat storage tank 1 is heated by the heater 3 to make the difference between the temperature of the heat conducting oil in the heat storage tank 1 and the required temperature of the autoclave 5 above the temperature difference threshold value, and then the heat conducting oil is supplied to the heat exchanger 6 of the autoclave 5 to heat and keep warm the composite material components in the autoclave 5.

[0064] Step 3: After the heating and keeping warm process of the composite material components is completed, the heat conducting oil outlet of the heater 3 is disconnected with the heat conducting oil inlet of the heat exchanger 6, the heat conducting oil outlet of the cooler 4 is connected with the heat conducting oil inlet of the heat exchanger 6, and the autoclave 5 enters the cooling process.

[0065] Step 4: The heat conducting oil in the cold storage tank 2 is cooled by the cooler 4 and then supplied into the heat exchanger 6 of the hot pressing tank 5 to cool the composite material member, the high-temperature heat conducting oil in the heat exchanger 6 is stored in the heat storage tank 1, when the heat conducting oil in the heat storage tank 1 is stored, the heat conducting oil outlet of the heat exchanger 6 is disconnected with the heat conducting oil inlet of the heat storage tank 1, the heat conducting oil outlet of the cooler 4 is disconnected with the heat conducting oil inlet of the heat exchanger 6, the hot pressing tank 5 is cooled by the cooler of the heat conducting oil system to reach the set temperature, and the curing process of the first batch of composite material members is completed;

[0066] Step 5: The first batch of composite material members is taken out, the next batch of composite material members is put into the hot pressing tank 5, the heat conducting oil inlet of the cold storage tank 2 is connected with the heat conducting oil outlet of the heat exchanger 6, the heat conducting oil outlet of the heater 3 is connected with the heat conducting oil inlet of the heat exchanger 6, the high-temperature heat conducting oil stored in the heat storage tank 1 is heated by the heater 3 and then supplied into the heat exchanger 6 to heat and keep warm the next batch of composite material members, and the low-temperature heat conducting oil in the heat exchanger 6 is stored in the cold storage tank 2.

[0067] Compared with the prior art, the beneficial effects of the heat recovery and utilization oil supply method provided by the embodiment are basically the same as those of the heat recovery and utilization heat conducting oil device provided by the first embodiment, which will not be repeated here.

[0068] Embodiment three

[0069] The embodiment provides a multi-tank operation system, which comprises the hot pressing tank 5 and the heat recovery and utilization heat conducting oil device provided by the first embodiment.

[0070] Compared with the prior art, the beneficial effects of the multi-tank operation system provided by the embodiment are basically the same as those of the hot pressing tank 5 heat recovery and utilization device based on the heat conducting oil system provided by the first embodiment, which will not be repeated here.

[0071] In order to ensure the temperature stability of the heat conducting oil supplied into the hot pressing tank 5, exemplarily, the number of the hot pressing tank 5 is multiple, that is, multiple hot pressing tanks 5 correspond to one heat recovery and utilization heat conducting oil device, and the multiple hot pressing tanks 5 are connected with one heat storage tank 1 and one cold storage tank 2. Because temperature fluctuations inevitably occur in the hot pressing process of the composite material member, the connection mode of the multiple hot pressing tanks 5 and the single heat recovery and utilization heat conducting oil device can sufficiently reduce the influence of temperature fluctuations on the temperature of the heat conducting oil and realize efficient use of energy. Meanwhile, since the multiple hot pressing tanks 5 commonly use one heat recovery and utilization heat conducting oil device, the repeated setting of equipment can be reduced, and the equipment cost and the floor area can be reduced.

[0072] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A heat transfer oil device for waste heat recovery and utilization, characterized in that, It includes a heat storage tank, a cold storage tank, a heater, and a cooler. The heat transfer oil inlets of the heat storage tank and the cold storage tank are connected to the heat transfer oil outlet of the heat exchanger. The heat transfer oil outlet of the heat storage tank is connected to the heat transfer oil inlet of the heat exchanger of the autoclave through the heater. The heat transfer oil outlet of the cold storage tank is connected to the heat transfer oil inlet of the heat exchanger of the autoclave through the cooler.

2. The heat transfer oil device for waste heat recovery and utilization according to claim 1, characterized in that, The heat transfer oil device also includes an oil outlet connection pipe assembly.

3. The heat transfer oil device for waste heat recovery and utilization according to claim 2, characterized in that, The oil outlet connection pipe assembly includes an oil outlet main pipe, a heat storage oil inlet branch pipe, a cold storage oil inlet branch pipe, a heat storage liquid inlet valve, and a cold storage liquid inlet valve. The heat transfer oil outlet of the heat exchanger is connected to the heat transfer oil inlet of the oil outlet main pipe. The heat transfer oil outlet of the oil outlet main pipe is connected to the heat transfer oil inlets of the heat storage oil inlet branch pipe and the cold storage oil inlet branch pipe. The heat transfer oil outlet of the heat storage oil inlet branch pipe is connected to the heat transfer oil inlet of the heat storage tank. The heat transfer oil outlet of the cold storage oil inlet branch pipe is connected to the heat transfer oil inlet of the cold storage tank. The heat storage liquid inlet valve is located on the heat storage oil inlet branch pipe, and the cold storage liquid inlet valve is located on the cold storage oil inlet branch pipe.

4. The heat transfer oil device for waste heat recovery and utilization according to claim 1, characterized in that, The heat transfer oil device also includes an oil inlet connecting pipe assembly.

5. The heat transfer oil device for waste heat recovery and utilization according to claim 4, characterized in that, The oil inlet connection pipe assembly includes an oil inlet main pipe, a heating oil outlet branch pipe, a cooling oil outlet branch pipe, a heating oil outlet valve, and a cooling oil outlet valve. The heat transfer oil outlets of the heating oil outlet branch pipe and the cooling oil outlet branch pipe are connected to the heat transfer oil inlet of the oil inlet main pipe. The heat transfer oil outlet of the oil inlet main pipe is connected to the heat transfer oil inlet of the heat exchanger. The heating oil outlet valve is located on the heating oil outlet branch pipe, and the cooling oil outlet valve is located on the cooling oil outlet branch pipe.

6. The heat transfer oil device for waste heat recovery and utilization according to claim 1, characterized in that, The heat transfer oil device also includes an intermediate connecting pipe assembly.

7. The heat transfer oil device for waste heat recovery and utilization according to claim 6, characterized in that, The intermediate connecting pipe assembly includes an intermediate main pipe, a heat storage oil outlet branch pipe, a cold storage oil outlet branch pipe, a heating oil inlet branch pipe, a cooling oil inlet branch pipe, a heat storage oil outlet valve, and a cold storage oil outlet valve. The heat transfer oil outlet of the heat storage tank is connected to the heat transfer oil inlet of the heat storage oil outlet branch pipe. The heat transfer oil outlet of the heat storage branch pipe is connected to the heat transfer oil inlet of the intermediate main pipe. The heat transfer oil outlet of the cold storage tank is connected to the heat transfer oil inlet of the cold storage oil outlet branch pipe. The heat transfer oil outlet of the cold storage branch pipe is connected to the heat transfer oil inlet of the intermediate main pipe. The heat transfer oil outlet of the intermediate main pipe is connected to the heat transfer oil inlets of the heating oil inlet branch pipe and the cooling oil inlet branch pipe. The heat transfer oil outlet of the heating oil inlet branch pipe is connected to the heat transfer oil inlet of the heater. The heat transfer oil outlet of the cooling oil inlet branch pipe is connected to the heat transfer oil inlet of the cooler. The heat storage oil outlet valve is located on the heat storage oil outlet branch pipe, and the cold storage oil outlet valve is located on the cold storage oil outlet branch pipe.

8. A method for supplying oil by recovering waste heat, characterized in that, The heat transfer oil device for waste heat recovery and utilization as described in any one of claims 1 to 7, wherein the oil supply method includes the following steps: Step 1: The first batch of composite material components are located in the autoclave. The heat transfer oil outlet of the heat storage tank is connected to the heat transfer oil inlet of the heat exchanger. The heat transfer oil outlet of the cold storage tank is disconnected from the heat transfer oil inlet of the heat exchanger. The heat transfer oil outlet of the heater is connected to the heat transfer oil inlet of the heat exchanger. The heat transfer oil outlet of the cooler is disconnected from the heat transfer oil inlet of the heat exchanger. Step 2: Determine whether the temperature difference between the heat transfer oil in the heat storage tank and the required temperature of the autoclave is above the temperature difference threshold (e.g., the temperature difference threshold is 10℃). If yes, the heat transfer oil in the heat storage tank is directly supplied to the heat exchanger of the autoclave to heat and insulate the composite material components in the autoclave. If no, the heat transfer oil in the heat storage tank is heated by a heater so that the temperature difference between the heat transfer oil in the heat storage tank and the required temperature of the autoclave is above the temperature difference threshold, and then supplied to the heat exchanger of the autoclave to heat and insulate the composite material components in the autoclave. Step 3: After the heating and insulation process of the composite material component is completed, the heat transfer oil outlet of the heater is disconnected from the heat transfer oil inlet of the heat exchanger, and the heat transfer oil outlet of the cooler is connected to the heat transfer oil inlet of the heat exchanger. The autoclave then enters the cooling process. Step 4: The heat transfer oil in the cold storage tank is cooled by the cooler and then supplied to the heat exchanger of the autoclave to cool down the composite material components. The high-temperature heat transfer oil in the heat exchanger is supplied to the heat storage tank for storage. After the heat storage tank has stored all the heat transfer oil, the heat transfer oil outlet of the heat exchanger is disconnected from the heat transfer oil inlet of the heat storage tank, and the heat transfer oil outlet of the cooler is disconnected from the heat transfer oil inlet of the heat exchanger. The autoclave is cooled by the cooler of the heat transfer oil system to complete the curing process of the first batch of composite material components. Step 5: Take out the first batch of composite material components and put the next batch of composite material components into the autoclave. Connect the heat transfer oil inlet of the cold storage tank to the heat transfer oil outlet of the heat exchanger, and connect the heat transfer oil outlet of the heater to the heat transfer oil inlet of the heat exchanger. The high-temperature heat transfer oil stored in the first batch in the heat storage tank is heated by the heater and then supplied to the heat exchanger to heat and keep the next batch of composite material components warm. The low-temperature heat transfer oil in the heat exchanger is supplied to the cold storage tank for storage.

9. A multi-tank operating system, characterized in that, It includes an autoclave and a heat transfer oil device for waste heat recovery and utilization as described in any one of claims 1 to 7.

10. The multi-tank operation system according to claim 9, characterized in that, Multiple autoclaves are connected to a thermal storage tank and a cold storage tank.

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