A temperature control method and control device for a thermal oil furnace and its application

Abstract

The present invention provides a temperature control method, a control device and application of a thermal oil furnace, the temperature control method comprising: (I) providing an energy storage unit, a main heating furnace and at least one hot standby furnace, the main heating furnace and the hot standby furnace are independently and cyclically connected to the energy storage unit, and the energy storage unit provides heat with a target temperature to the user end; (II) controlling the main heating furnace to continuously supply heat to the energy storage unit; (III) setting a rated difference, and obtaining a temperature threshold of the oil outlet temperature change of the hot standby furnace based on the target temperature and the rated difference; (IV) obtaining the real-time oil outlet temperature of the hot standby furnace, and judging the relationship between the real-time oil outlet temperature and the temperature threshold, so as to control the hot standby furnace and the energy storage unit to perform cyclic heat exchange, so that the hot standby furnace is in a "heat standby state". The present invention upgrades the hot oil system, effectively reduces the operating energy consumption and saves production costs under the premise of ensuring safe operation and reliable provision of heat source.

Description

Technical Field

[0001] The invention belongs to the technical field of heating for copper clad laminate production, and relates to a temperature control method and a control device for a heat transfer oil furnace and applications thereof. Background Art

[0002] Thermal oil, also known as heat transfer oil, can achieve high temperature characteristics under normal pressure, with an operating temperature of up to 300°C and a high thermal conductivity. It is a process heating medium with good performance and is widely used in various fields to meet the process requirements of heating and cooling at the same time. The hot oil furnace uses thermal oil as a medium and a hot oil circulation pump to circulate the thermal oil in the liquid phase. After the heat energy is delivered to the heat-using equipment, it returns to the hot oil furnace for reheating, and the continuous circulation provides heat energy for the heat-using equipment.

[0003] In the field of copper clad laminate production, hot and cold integrated laminators are usually used for product pressing. During the pressing process, a hot oil furnace is required to heat the heat medium oil, and the oil enters the hot and cold integrated laminator through a conveying system to heat the product. The production process requires that once the product starts heating, it cannot be interrupted in the middle, and the heating to cooling process must be completed according to the set heating steps. If there is a heat interruption, the entire mold product will be scrapped. Therefore, when equipping the hot oil system, at least two boilers are usually configured to ensure the normal supply of heat during the product heating process. However, the heat consumption of the hot and cold integrated press is staged, and no heat is required in the cooling stage, but in order to ensure the system temperature, the hot oil furnace should continue to operate and cannot be shut down. The operation of the two hot oil furnaces consumes a lot of energy, which increases the production cost of the product. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a temperature control method, a control device and applications of a thermal oil furnace, to upgrade the hot oil system, and to effectively reduce operating energy consumption and save production costs while ensuring safe operation and reliable provision of heat source.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a temperature control method for a thermal oil furnace, the temperature control method comprising:

[0007] (I) providing an energy storage unit, a main heating furnace and at least one hot standby furnace, wherein the main heating furnace and the hot standby furnace are independently and cyclically connected to the energy storage unit, and the energy storage unit provides thermal energy with a target temperature to a user end;

[0008] (II) controlling the main heating furnace to continuously supply heat to the energy storage unit;

[0009] (III) setting a rated difference, and obtaining a temperature threshold value of the oil outlet temperature change of the hot standby furnace based on the target temperature and the rated difference;

[0010] (IV) Obtaining the real-time oil outlet temperature of the hot standby furnace, and determining the relationship between the real-time oil outlet temperature and the temperature threshold, so as to control the hot standby furnace to perform cyclic heat exchange with the energy storage unit, so that the hot standby furnace is in a "hot standby state".

[0011] The main heating furnace and the hot standby furnace in the present invention are independently connected to the energy storage unit in a circular manner, and the energy storage unit is connected to the user end in a circular manner. The main heating furnace (or hot standby furnace) is used to heat the hot kerosene and transport it to the upper part of the energy storage unit. The user end exchanges heat with the high-temperature hot kerosene from the upper part of the energy storage unit. The low-temperature hot kerosene after heat exchange returns to the lower part of the energy storage unit and is then transported to the main heating furnace (or hot standby furnace) for heating. This cyclic continuous operation is carried out to continuously provide heat energy to the user end. In the present invention, when the main heating furnace continuously supplies heat to the energy storage unit, the hot standby furnace is controlled to perform cyclic heat exchange with the high-temperature hot oil in the energy storage unit according to the real-time oil outlet temperature of the hot standby furnace, so that the oil outlet temperature of the hot standby furnace is increased and is within the temperature threshold range, that is, it is in the "heat standby state". The main heating furnace of the present invention is in a continuous heat supply state, while the hot standby furnace is in a "heat standby state". Only when the main heating furnace fails or the heat demand of the user increases instantly and the main heating furnace fails to supply heat in time, the burner of the hot standby furnace is immediately turned on to supply heat to the energy storage unit. Compared with the traditional two heating furnaces heating together, it effectively reduces energy consumption and production costs, and avoids further lowering of the system oil temperature when the hot standby furnace is started when the temperature of the main heating furnace is low, affecting the continuity of the user's demand for heat.

[0012] As a preferred technical solution of the present invention, during the continuous heating process of the main heating furnace, the heat flowing back from the energy storage unit to the main heating furnace has a first temperature.

[0013] Preferably, in the cyclic heat exchange between the hot standby furnace and the energy storage unit, the heat flowing back from the energy storage unit to the hot standby furnace has a second temperature.

[0014] In the present invention, the high-temperature hot kerosene heated by the main heating furnace (or hot standby furnace) is heat exchanged in the energy storage unit, and after the temperature is transferred, it is converted into low-temperature hot kerosene, so that the temperature of the hot kerosene returning to the main heating furnace (or hot standby furnace) is reduced.

[0015] As a preferred technical solution of the present invention, the temperature threshold is the difference between the target temperature and the rated difference.

[0016] Preferably, the target temperature is between 100 and 300°C and is not equal to 300°C. For example, it may be 100°C, 110°C, 120°C, 150°C, 160°C, 170°C, 200°C, 220°C, 250°C, 270°C, 280°C, 290°C or 295°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0017] In the present invention, when the target temperature required by the user end is lower than 100°C, the requirement can be met directly by using cheap low-value heat without using hot kerosene for heating, which leads to energy waste. If the required target temperature is higher than 300°C, it is easy to cause the hot kerosene to gasify, affecting the operation of the system.

[0018] Preferably, the rated difference ranges from 0 to 100°C and is not equal to 100°C. For example, it may be 0°C, 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 40°C, 45°C, 50°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C or 100°C, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable. It is further preferably 10 to 50°C.

[0019] The present invention pre-sets the rated difference to calculate the temperature threshold of the hot standby furnace, so that the operating state of the hot standby furnace is optimal, and frequent start and stop of the circulation pump can be avoided. The farther the oil temperature of the hot standby furnace is from the target temperature, the greater the difference, the longer the start and stop interval of the oil pump, and the lower the oil temperature of the hot standby furnace.

[0020] As a preferred technical solution of the present invention, in step (IV), the judging method comprises:

[0021] Determine the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold;

[0022] When the real-time oil outlet temperature of the hot standby furnace is lower than the temperature threshold, and the first temperature is higher than the temperature threshold, the hot standby furnace is controlled to start circulating heat exchange with the energy storage unit until the temperature of the heat flowing back to the hot standby furnace reaches the target temperature, or until the hot standby furnace continues circulating heat exchange for a set time, and then the circulation is stopped.

[0023] When the real-time oil outlet temperature of the hot standby furnace is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace is greater than the temperature threshold, the continuous heating state of the existing main heating furnace is maintained.

[0024] Preferably, the set time is 120 to 250 s, for example, it can be 120 s, 125 s, 130 s, 140 s, 150 s, 180 s, 200 s, 220 s, 230 s, 240 s or 250 s, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] When the real-time oil outlet temperature of the hot standby furnace in the standby state is less than the temperature threshold, and the temperature of the hot kerosene flowing back to the main heating furnace (i.e., the first temperature) is greater than the temperature threshold, the hot standby furnace and the energy storage unit are controlled to perform cyclic heat exchange, and the heat exchange is stopped after the temperature of the hot kerosene flowing back to the hot standby furnace (i.e., the second temperature) reaches the required temperature, thereby realizing continuous heating of the main heating furnace and the hot standby furnace being in standby heat at the same time. Since the oil outlet temperature of the hot standby furnace in the "standby state" is less different from that of the main heating furnace, after the hot standby furnace is turned on, it is possible to avoid causing the system oil temperature to continue to drop.

[0026] In addition, the following two methods can be used to determine the shutdown time of the hot standby furnace: one is based on the collected real-time oil outlet temperature of the hot standby furnace. When the real-time oil outlet temperature reaches the target temperature, the circulating heat exchange between the hot standby furnace and the energy storage unit can be shut down; the other is based on the set time. The set time is the total time required for the oil outlet temperature of the hot standby furnace to increase from the temperature threshold to the target temperature. After the set time is reached, the circulating heat exchange between the hot standby furnace and the energy storage unit can be shut down.

[0027] As a preferred technical solution of the present invention, the temperature control method further includes:

[0028] The real-time oil supply temperature of the main heating furnace is obtained, and the relationship between the real-time oil supply temperature and the target temperature is determined to control the switching of the hot standby furnace to continuously supply heat to the energy storage unit.

[0029] Preferably, the judging method includes:

[0030] When the real-time oil supply temperature of the main heating furnace is lower than the target temperature, the hot standby furnace is switched to continuously supply heat to the energy storage unit, and the main heating furnace is maintained and inspected.

[0031] In the present invention, when the operation of the main heating furnace is abnormal, the hot standby furnace can be quickly switched to supply heat to the energy storage unit. The oil temperature of the hot standby furnace is not lower than the temperature threshold. Therefore, starting the hot standby furnace will not cause the oil temperature of the energy storage unit to drop rapidly, and heat can be provided to the user end stably and continuously.

[0032] As a preferred technical solution of the present invention, the temperature control method further includes:

[0033] Get the real-time heat consumption of the user end;

[0034] Determine the relationship between the heat energy with the target temperature provided by the energy storage unit and the real-time heat consumption;

[0035] The hot standby furnace is controlled to start, and together with the main heating furnace, heat is supplied to the energy storage unit.

[0036] In the present invention, when the heat demand at the user end increases instantly and the main heating furnace cannot supply in time, the hot standby furnace can be started immediately, and the hot standby furnace and the main heating furnace are used to supply heat to the energy storage unit together to meet the heat demand at the user end. Since the oil temperature of the hot standby furnace is not lower than the temperature threshold, starting the hot standby furnace will not cause the oil temperature of the energy storage unit to drop rapidly.

[0037] In a second aspect, the present invention provides a temperature control device for a thermal oil furnace, the temperature control device being used in the temperature control method for the thermal oil furnace described in the first aspect, the temperature control device comprising a control unit, an energy storage unit, a main heating furnace and at least one hot standby furnace;

[0038] The main heating furnace and the hot standby furnace are independently and cyclically connected to an energy storage unit, the energy storage unit is used to provide thermal energy to the user end, and the control unit is electrically connected to the energy storage unit, the main heating furnace and the hot standby furnace respectively.

[0039] As a preferred technical solution of the present invention, a first circulation pump is provided between the energy storage unit and the main heating furnace, and the first circulation pump is used to drive heat to circulate between the energy storage unit and the main heating furnace.

[0040] A second circulation pump is provided between the energy storage unit and the hot standby furnace, and the second circulation pump is used to drive heat to circulate between the energy storage unit and the hot standby furnace.

[0041] The control unit is electrically connected to the first circulation pump and the second circulation pump respectively.

[0042] The control unit in the present invention controls the start and stop of the main heating furnace supplying heat to the energy storage unit by controlling the switch of the first circulation pump, and controls the start and stop of the hot standby furnace supplying heat to the energy storage unit by controlling the switch of the second circulation pump.

[0043] In order to help those skilled in the art better understand the overall technical solution and working process of the present invention, the present invention exemplarily provides the following specific methods for the control unit to electrically control the energy storage unit, the main heating furnace and the hot standby furnace respectively:

[0044] Solution 1: (1) The control unit controls the start of the first circulation pump, and the main heating furnace continuously supplies heat to the energy storage unit, thereby providing heat energy with a target temperature to the user end, and the heat flowing back from the energy storage unit to the main heating furnace has a first temperature;

[0045] (2) setting a rated difference, and obtaining a temperature threshold of the oil outlet temperature change of the hot standby furnace based on the target temperature and the rated difference;

[0046] (3) The control unit obtains the real-time oil outlet temperature of the hot standby furnace, and determines the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold:

[0047] When the real-time oil outlet temperature of the hot standby furnace is less than the temperature threshold, and the first temperature is greater than the temperature threshold, the control unit electrically controls to start the second circulation pump, so that the hot standby furnace and the energy storage unit perform cyclic heat exchange, and the heat returned from the energy storage unit to the hot standby furnace has the second temperature, and the second circulation pump continues to work until the second temperature reaches the target temperature, and then the second circulation pump is turned off to stop the cyclic heat exchange;

[0048] When the real-time oil outlet temperature of the hot standby furnace is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace is greater than the temperature threshold, the existing main heating furnace is maintained in a continuous heating state;

[0049] (4) At the same time, the real-time oil supply temperature of the main heating furnace is obtained, and the relationship between the real-time oil supply temperature and the target temperature is determined. When the real-time oil outlet temperature is lower than the target temperature, the control unit starts the second circulation pump, switches the hot standby furnace to continuously supply heat to the energy storage unit, and shuts down the first circulation pump to perform maintenance on the main heating furnace;

[0050] (5) Obtaining the real-time heat consumption at the user end, determining the relationship between the heat energy with the target temperature provided by the energy storage unit and the real-time heat consumption, and when the real-time heat consumption exceeds the heat energy provided by the energy storage unit, controlling the hot standby furnace to start, and supplying heat to the energy storage unit together with the main heating furnace.

[0051] Solution 2: (1) The control unit controls the start of the first circulation pump, and the main heating furnace continuously supplies heat to the energy storage unit, thereby providing heat energy with a target temperature to the user end, and the heat flowing back from the energy storage unit to the main heating furnace has a first temperature;

[0052] (2) setting a rated difference, and obtaining a temperature threshold of the oil outlet temperature change of the hot standby furnace based on the target temperature and the rated difference;

[0053] (3) The control unit obtains the real-time oil outlet temperature of the hot standby furnace, and determines the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold:

[0054] When the real-time oil outlet temperature of the hot standby furnace is less than the temperature threshold, and the first temperature is greater than the temperature threshold, the control unit electrically controls to start the second circulation pump, so that the hot standby furnace and the energy storage unit perform cyclic heat exchange until the set time is reached, and then shuts down the second circulation pump to stop the cyclic heat exchange;

[0055] When the real-time oil outlet temperature of the hot standby furnace is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace is greater than the temperature threshold, the existing main heating furnace is maintained in a continuous heating state;

[0056] (4) At the same time, the real-time oil supply temperature of the main heating furnace is obtained, and the relationship between the real-time oil supply temperature and the target temperature is determined. When the real-time oil outlet temperature is lower than the target temperature, the control unit starts the second circulation pump, switches the hot standby furnace to continuously supply heat to the energy storage unit, and shuts down the first circulation pump to perform maintenance on the main heating furnace;

[0057] (5) Obtaining the real-time heat consumption at the user end, determining the relationship between the heat energy with the target temperature provided by the energy storage unit and the real-time heat consumption, and when the real-time heat consumption exceeds the heat energy provided by the energy storage unit, controlling the hot standby furnace to start, and supplying heat to the energy storage unit together with the main heating furnace.

[0058] Preferably, the energy storage unit is also provided with an expansion tank.

[0059] It should be noted that, since hot kerosene expands when heated, the present invention can buffer the hot kerosene in the energy storage unit by providing an expansion tank.

[0060] Preferably, the energy storage unit is cyclically connected to the user end.

[0061] As a preferred technical solution of the present invention, the control unit includes a first sensor component, a second sensor component, a third sensor component and a fourth sensor component.

[0062] The first sensor component is arranged at the inlet end of the main heating furnace and is used to collect the first temperature of the main heating furnace.

[0063] The second sensor component is arranged at the inlet end of the hot standby furnace, and is used to collect the second temperature of the hot standby furnace.

[0064] The third sensor component is arranged at the outlet end of the main heating furnace and is used to collect the oil outlet temperature of the main heating furnace.

[0065] The fourth sensor component is arranged at the outlet end of the hot standby furnace and is used to collect the outlet oil temperature of the hot standby furnace.

[0066] In a third aspect, the present invention provides an application of the temperature control device of the thermal oil furnace described in the second aspect, wherein the temperature control device of the thermal oil furnace is applied to a preparation process of a copper clad laminate.

[0067] In the preparation process of copper clad laminate, the temperature control device of the heat-conducting oil furnace of the present invention provides high-temperature hot kerosene to the hot and cold integrated laminator, thereby heating the pressed product. When an abnormality occurs in the main heating furnace, the hot standby furnace (the oil temperature of the hot standby furnace will not be lower than the temperature threshold) can be quickly switched to heat the system to avoid a rapid drop in the oil temperature, and heat can be stably and continuously provided to the product being heated to meet the temperature required for the pressed product, reduce the scrapping of the pressed product, and avoid affecting the quality of the laminated product.

[0068] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] The purpose of the present invention is to provide a temperature control method, control device and application of a thermal oil furnace, upgrade the hot oil system, the main heating furnace and the hot standby furnace are independently connected to the energy storage unit in a circular manner, and the energy storage unit is connected to the user end in a circular manner, and the main heating furnace (or hot standby furnace) is used to heat the hot kerosene and transport it to the upper part of the energy storage unit. The user end exchanges heat with the high-temperature hot kerosene from the upper part of the energy storage unit, and the low-temperature hot kerosene after heat exchange returns to the lower part of the energy storage unit, and then transported to the main heating furnace (or hot standby furnace) for heating, so as to realize continuous supply of heat energy to the user end. The main heating furnace of the present invention is in an uninterrupted continuous heating state, while the hot standby furnace is in a hot standby state, and intermittently supplies heat to the energy storage unit according to the oil outlet temperature of the hot standby furnace. Compared with the traditional two heating furnaces heating together, it effectively reduces energy consumption and production costs, and avoids starting the hot standby furnace when the temperature of the main heating furnace is low, which causes the system oil temperature to be further lowered, affecting the continuity of the user end's demand for heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 This is a schematic structural diagram of a temperature control device for a thermal oil furnace used in Example 1 of the present invention;

[0072] Figure 2 Schematic diagram of the thermal energy cycle of the main heating furnace in Example 1 of the present invention.

[0073] Among them, 1-main heating furnace; 2-hot standby furnace; 3-energy storage unit; 4-first circulation pump; 5-second circulation pump; 6-user end. DETAILED DESCRIPTION

[0074] It should be understood that, in the description of the present invention, the terms "center", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0075] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0076] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main inventive point of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements and specific limitations on this.

[0077] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0078] In a specific embodiment, the present invention provides a temperature control method for a thermal oil furnace, the temperature control method comprising:

[0079] (1) providing an energy storage unit 3, a main heating furnace 1 and at least one hot standby furnace 2, wherein the main heating furnace 1 and the hot standby furnace 2 are independently and cyclically connected to the energy storage unit 3, and the energy storage unit 3 provides thermal energy with a target temperature to a user terminal 6;

[0080] (2) controlling the main heating furnace 1 to continuously supply heat to the energy storage unit 3;

[0081] (3) setting a rated difference, and obtaining a temperature threshold of the oil outlet temperature change of the hot standby furnace 2 based on the target temperature and the rated difference;

[0082] (4) Obtaining the real-time oil outlet temperature of the hot standby furnace 2, and determining the relationship between the real-time oil outlet temperature and the temperature threshold, so as to control the hot standby furnace 2 to perform cyclic heat exchange with the energy storage unit 3, so that the hot standby furnace 2 is in a "hot standby state".

[0083] The main heating furnace 1 and the hot standby furnace 2 in the present invention are independently and cyclically connected to the energy storage unit 3, and the energy storage unit 3 is cyclically connected to the user end 6. The main heating furnace 1 (or the hot standby furnace 2) is used to heat the hot kerosene and transport it to the upper part of the energy storage unit 3. The user end 6 exchanges heat with the high-temperature hot kerosene at the upper part of the energy storage unit 3. The low-temperature hot kerosene after heat exchange returns to the lower part of the energy storage unit 3 and is then transported to the main heating furnace 1 (or the hot standby furnace 2) for heating. In this way, the cycle runs continuously to realize the continuous supply of heat energy to the user end 6.

[0084] In the case where the main heating furnace 1 continuously supplies heat to the energy storage unit 3, the present invention controls the hot standby furnace 2 to perform circulating heat exchange with the high-temperature hot oil in the energy storage unit 3 according to the real-time oil outlet temperature of the hot standby furnace 2, so that the oil outlet temperature of the hot standby furnace 2 is increased and is within the range of the temperature threshold, that is, it is in the "heat standby state".

[0085] In some embodiments, during the continuous heating process of the main heating furnace 1 , the heat flowing back from the energy storage unit 3 into the main heating furnace 1 has a first temperature.

[0086] In the cyclic heat exchange between the hot standby furnace 2 and the energy storage unit 3, the heat flowing back from the energy storage unit 3 to the hot standby furnace 2 has a second temperature.

[0087] In the present invention, the high-temperature hot kerosene heated by the main heating furnace 1 (or the hot standby furnace 2) is heat exchanged in the energy storage unit 3, and then the temperature is transferred and converted into low-temperature hot kerosene, so that the temperature of the hot kerosene returning to the main heating furnace 1 (or the hot standby furnace 2) is reduced.

[0088] In some embodiments, the target temperature is between 100 and 300° C. and is not equal to 300° C. In the present invention, when the target temperature required by the user end 6 is lower than 100° C., the requirement can be met directly by using cheap low-value heat, without using hot kerosene for heating, which leads to energy waste. If the required target temperature is higher than 300° C., it is easy to cause the hot kerosene to gasify, affecting the operation of the system.

[0089] In some embodiments, the temperature threshold is the difference between the target temperature and the rated difference. The rated difference ranges from 0 to 100°C and is not equal to 100°C. The present invention pre-sets the rated difference to calculate the temperature threshold of the hot standby furnace 2, so that the operation state of the hot standby furnace 2 is optimal, and the frequent start and stop of the circulation pump can be avoided. The greater the difference between the real-time oil outlet temperature of the hot standby furnace 2 and the target temperature, the greater the start and stop interval of the oil pump, and the lower the oil temperature of the hot standby furnace 2.

[0090] In some embodiments, in step (4), the determination method includes:

[0091] Determine the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold;

[0092] When the real-time oil outlet temperature of the hot standby furnace 2 is lower than the temperature threshold, and the first temperature is higher than the temperature threshold, the hot standby furnace 2 is controlled to be turned on for cyclic heat exchange with the energy storage unit 3 until the temperature of the heat flowing back to the hot standby furnace 2 reaches the target temperature, or until the hot standby furnace 2 continues the cyclic heat exchange for a set time, and then the circulation is stopped;

[0093] When the real-time oil outlet temperature of the hot standby furnace 2 is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace 1 is greater than the temperature threshold, the existing main heating furnace 1 is maintained in a continuous heating state.

[0094] In some embodiments, the set time is 120 to 250 seconds.

[0095] When the real-time oil outlet temperature of the hot standby furnace 2 in the standby state is less than the temperature threshold, and the temperature of the hot kerosene flowing back to the main heating furnace 1 (i.e., the first temperature) is greater than the temperature threshold, the present invention controls the hot standby furnace 2 to perform cyclic heat exchange with the energy storage unit 3, and stops the heat exchange after the temperature of the hot kerosene flowing back to the hot standby furnace 2 (i.e., the second temperature) reaches the required temperature, thereby realizing the continuous heating of the main heating furnace 1 and the hot standby furnace 2 being in standby heat at the same time. Since the difference between the oil outlet temperature of the hot standby furnace 2 and the temperature of the main heating furnace 1 in the standby state is small, after the hot standby furnace 2 is turned on, it can avoid causing the system oil temperature to continue to drop.

[0096] In addition, the following two methods can be used to determine the shutdown time of the hot standby furnace 2: one is based on the collected real-time oil outlet temperature of the hot standby furnace 2. When the real-time oil outlet temperature reaches the target temperature, the circulation heat exchange between the hot standby furnace 2 and the energy storage unit 3 can be shut down; the other is based on the set time. The set time is the total time required for the oil outlet temperature of the hot standby furnace 2 to increase from the temperature threshold to the target temperature. After the set time is reached, the circulation heat exchange between the hot standby furnace 2 and the energy storage unit 3 can be shut down.

[0097] In some embodiments, the control method further includes: obtaining the real-time oil supply temperature of the main heating furnace 1, and determining the relationship between the real-time oil supply temperature and the target temperature, so as to control switching of the hot standby furnace 2 to continuously supply heat to the energy storage unit 3.

[0098] In some embodiments, the judgment method includes: when the real-time oil supply temperature of the main heating furnace 1 is lower than the target temperature, switching the hot standby furnace 2 to continuously supply heat to the energy storage unit 3 , and performing maintenance on the main heating furnace 1 .

[0099] In the present invention, when the operation of the main heating furnace 1 is abnormal, the hot standby furnace 2 can be quickly switched to supply heat to the energy storage unit 3. The oil temperature of the hot standby furnace 2 is not lower than the temperature threshold. Therefore, starting the hot standby furnace 2 will not cause the oil temperature of the energy storage unit 3 to drop rapidly, and heat can be stably and continuously provided to the user end 6.

[0100] In some embodiments, the temperature control method further comprises:

[0101] Obtaining real-time heat consumption of the user terminal 6;

[0102] Determine the relationship between the heat energy with the target temperature provided by the energy storage unit 3 and the real-time heat consumption;

[0103] The hot standby furnace 2 is controlled to start, and together with the main heating furnace 1 , heat is supplied to the energy storage unit 3 .

[0104] In the present invention, when the heat demand of the user end 6 increases instantly and the main heating furnace 1 cannot supply in time, the hot standby furnace 2 can be immediately started, and the hot standby furnace 2 and the main heating furnace 1 are used to supply heat to the energy storage unit 3 to meet the heat demand of the user end 6. Since the oil temperature of the hot standby furnace 2 is not lower than the temperature threshold, starting the hot standby furnace 2 will not cause the oil temperature of the energy storage unit 3 to drop rapidly.

[0105] In another specific embodiment, the present invention provides a temperature control device for a thermal oil furnace, the temperature control device is used in a temperature control method for a thermal oil furnace according to a specific embodiment, the temperature control device comprises a control unit, an energy storage unit 3, a main heating furnace 1 and at least one hot standby furnace 2;

[0106] The main heating furnace 1 and the hot standby furnace 2 are independently and cyclically connected to the energy storage unit 3, the energy storage unit 3 is used to provide thermal energy to the user end 6, and the control unit is electrically connected to the energy storage unit 3, the main heating furnace 1 and the hot standby furnace 2 respectively.

[0107] In some embodiments, a first circulation pump 4 is provided between the energy storage unit 3 and the main heating furnace 1, and the first circulation pump 4 is used to drive heat to circulate between the energy storage unit 3 and the main heating furnace 1. A second circulation pump 5 is provided between the energy storage unit 3 and the hot standby furnace 2, and the second circulation pump 5 is used to drive heat to circulate between the energy storage unit 3 and the hot standby furnace 2. The control unit is electrically connected to the first circulation pump 4 and the second circulation pump 5, respectively.

[0108] The control unit in the present invention controls the start and stop of the heating process of the main heating furnace 1 to the energy storage unit 3 by controlling the switch of the first circulation pump 4, and controls the start and stop of the heating process of the hot standby furnace 2 to the energy storage unit 3 by controlling the switch of the second circulation pump 5.

[0109] In order to help those skilled in the art better understand the overall technical solution and working process of the present invention, the present invention exemplarily provides the following specific methods for the control unit to electrically control the energy storage unit 3, the main heating furnace 1 and the hot standby furnace 2 respectively:

[0110] Solution 1: (1) The control unit controls the start of the first circulation pump 4, so that the main heating furnace 1 continuously supplies heat to the energy storage unit 3, thereby providing heat energy with a target temperature to the user end 6, and the heat flowing back from the energy storage unit 3 to the main heating furnace 1 has a first temperature;

[0111] (2) setting a rated difference, and obtaining a temperature threshold of the oil outlet temperature change of the hot standby furnace 2 based on the target temperature and the rated difference;

[0112] (3) The control unit obtains the real-time oil outlet temperature of the hot standby furnace 2, and determines the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold:

[0113] When the real-time oil outlet temperature of the hot standby furnace 2 is less than the temperature threshold, and the first temperature is greater than the temperature threshold, the control unit electrically controls to start the second circulation pump 5, so that the hot standby furnace 2 and the energy storage unit 3 perform cyclic heat exchange, and the heat returned from the energy storage unit 3 to the hot standby furnace 2 has the second temperature, and the second circulation pump 5 continues to work until the second temperature reaches the target temperature, and then the second circulation pump 5 is turned off to stop the cyclic heat exchange;

[0114] When the real-time oil outlet temperature of the hot standby furnace 2 is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace 1 is greater than the temperature threshold, the existing main heating furnace 1 is maintained in a continuous heating state;

[0115] (4) At the same time, the real-time oil supply temperature of the main heating furnace 1 is obtained, and the relationship between the real-time oil supply temperature and the target temperature is determined. When the real-time oil outlet temperature is lower than the target temperature, the control unit starts the second circulation pump 5, switches the hot standby furnace 2 to continuously supply heat to the energy storage unit 3, and shuts down the first circulation pump 4 to perform maintenance on the main heating furnace 1;

[0116] (5) Obtain the real-time heat consumption of the user terminal 6, determine the relationship between the heat energy with the target temperature provided by the energy storage unit 3 and the real-time heat consumption, and when the real-time heat consumption exceeds the heat energy provided by the energy storage unit 3, control the hot standby furnace 2 to start, and supply heat to the energy storage unit 3 together with the main heating furnace 1.

[0117] Solution 2: (1) The control unit controls the start of the first circulation pump 4, so that the main heating furnace 1 continuously supplies heat to the energy storage unit 3, thereby providing heat energy with a target temperature to the user end 6, and the heat flowing back from the energy storage unit 3 to the main heating furnace 1 has a first temperature;

[0118] (2) setting a rated difference, and obtaining a temperature threshold of the oil outlet temperature change of the hot standby furnace 2 based on the target temperature and the rated difference;

[0119] (3) The control unit obtains the real-time oil outlet temperature of the hot standby furnace 2, and determines the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold:

[0120] When the real-time oil outlet temperature of the hot standby furnace 2 is less than the temperature threshold, and the first temperature is greater than the temperature threshold, the control unit electrically controls to start the second circulation pump 5, so that the hot standby furnace 2 and the energy storage unit 3 perform cyclic heat exchange, until the set time is reached, and then the second circulation pump 5 is shut down to stop the cyclic heat exchange;

[0121] When the real-time oil outlet temperature of the hot standby furnace 2 is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace 1 is greater than the temperature threshold, the existing main heating furnace 1 is maintained in a continuous heating state;

[0122] (4) At the same time, the real-time oil supply temperature of the main heating furnace 1 is obtained, and the relationship between the real-time oil supply temperature and the target temperature is determined. When the real-time oil outlet temperature is lower than the target temperature, the control unit starts the second circulation pump 5, switches the hot standby furnace 2 to continuously supply heat to the energy storage unit 3, and shuts down the first circulation pump 4 to perform maintenance on the main heating furnace 1;

[0123] (5) Obtain the real-time heat consumption of the user terminal 6, determine the relationship between the heat energy with the target temperature provided by the energy storage unit 3 and the real-time heat consumption, and when the real-time heat consumption exceeds the heat energy provided by the energy storage unit 3, control the hot standby furnace 2 to start, and supply heat to the energy storage unit 3 together with the main heating furnace 1.

[0124] In some embodiments, the energy storage unit 3 is further provided with an expansion tank. Since the hot kerosene will expand when heated, the present invention can buffer the hot kerosene in the energy storage unit 3 by providing an expansion tank.

[0125] The present invention does not impose any specific limitation or special requirements on the structure of the expansion tank. Any other expansion tank disclosed in the prior art that can achieve the same function can be used in the present invention. In order to help those skilled in the art better understand the overall technical solution and working process of the present invention, the present invention exemplarily provides the following expansion tank structure:

[0126] The expansion tank includes an expansion tank body, an overflow pipe and an expansion pipe, and the overflow pipe and the expansion pipe are respectively located on both sides of the expansion tank body. The expansion body is a cylindrical hollow structure, and the expansion body is connected to the buffer tank through the overflow pipe. The expansion tank body is connected to the highest end of the energy storage unit 3 through the expansion pipe. When the heat transfer oil expands due to heat, it enters the expansion tank body through the expansion pipe and flows into the buffer tank through the overflow pipe.

[0127] In some implementations, the energy storage unit 3 is cyclically connected to the user end 6 .

[0128] In some embodiments, the control unit includes a first sensor component, a second sensor component, a third sensor component and a fourth sensor component. The first sensor component is arranged at the inlet end of the main heating furnace 1, and is used to collect the first temperature of the main heating furnace 1. The second sensor component is arranged at the inlet end of the hot standby furnace 2, and is used to collect the second temperature of the hot standby furnace 2. The third sensor component is arranged at the outlet end of the main heating furnace 1, and is used to collect the oil outlet temperature of the main heating furnace 1. The fourth sensor component is arranged at the outlet end of the hot standby furnace 2, and is used to collect the oil outlet temperature of the hot standby furnace 2.

[0129] The temperature control device of the heat-conducting oil furnace provided by the present invention is applied to the preparation process of copper-clad laminates. In the preparation process of copper-clad laminates, the temperature control device of the heat-conducting oil furnace of the present invention provides high-temperature hot kerosene to the hot and cold integrated laminator, thereby heating the pressed products. When an abnormality occurs in the main heating furnace 1, the hot standby furnace 2 (the oil temperature of the hot standby furnace 2 will not be lower than the temperature threshold) can be quickly switched to heat the system to avoid a rapid drop in the oil temperature, and heat can be stably and continuously provided to the product being heated to meet the temperature required for the pressed product, reduce the scrapping of the pressed product, and avoid affecting the quality of the laminated product.

[0130] Example 1

[0131] This embodiment provides a temperature control method for a thermal oil furnace, which specifically includes the following steps:

[0132] (1) Figure 1As shown, a main heating furnace 1 with a rated thermal power of 3.0Mw and a hot standby furnace 2 with a rated thermal power of 3.0Mw are provided, each of which is equipped with a 15Kw fan. The main heating furnace 1 is circulatedly connected to the energy storage unit 3 through a 50Kw first circulation pump 4, and the hot standby furnace 2 is circulatedly connected to the energy storage unit 3 through a 50Kw second circulation pump 5. The energy storage unit 3 is connected to the user end 6 (i.e., a hot and cold integrated laminator) to provide high-temperature hot kerosene;

[0133] (2) The control unit controls the opening of the first circulation pump 4, such as Figure 2 As shown, the main heating furnace 1 continuously supplies heat to the energy storage unit 3 for 24 hours, and then provides hot kerosene at 230°C to the hot and cold integrated laminator. The first temperature of the hot kerosene refluxed from the energy storage unit 3 to the main heating furnace 1 is 205°C.

[0134] (3) The rated difference is set to 20°C. Based on the target temperature and the rated difference, the temperature threshold of the oil outlet temperature change of the hot standby furnace 2 is obtained to be 210°C;

[0135] (4) The control unit obtains the real-time oil outlet temperature of the hot standby furnace 2, and determines the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold. When the real-time oil outlet temperature of the hot standby furnace 2 is less than the temperature threshold, and the first temperature is greater than the temperature threshold, the control unit electrically controls to start the second circulation pump 5, so that the hot standby furnace 2 and the energy storage unit 3 perform circulation heat exchange. The heat returned from the energy storage unit 3 to the hot standby furnace 2 has a second temperature. The second circulation pump 5 continues to work until the second temperature reaches the target temperature. The second circulation pump 5 stops the circulation heat exchange. When the real-time oil outlet temperature of the hot standby furnace 2 is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace 1 is greater than the temperature threshold, the existing main heating furnace 1 is maintained in a continuous heating state;

[0136] (5) Obtaining the real-time oil supply temperature of the main heating furnace 1 and determining the relationship between the real-time oil supply temperature and the target temperature; when the real-time oil outlet temperature is lower than the target temperature, the control unit starts the second circulation pump 5, switches the hot standby furnace 2 to continuously provide heat with the target temperature to the energy storage unit 3, and shuts down the first circulation pump 4 to perform maintenance on the main heating furnace 1;

[0137] (6) Obtain the real-time heat consumption of the user terminal 6, determine the relationship between the heat energy with the target temperature provided by the energy storage unit 3 and the real-time heat consumption, and when the real-time heat consumption exceeds the heat energy provided by the energy storage unit 3, control the hot standby furnace 2 to start, and supply heat to the energy storage unit 3 together with the main heating furnace 1.

[0138] Example 2

[0139] This embodiment provides a temperature control method for a thermal oil furnace, which differs from Embodiment 1 in that the rated difference set in step (3) is 10° C., and the other process parameters are the same as those in Embodiment 1.

[0140] Example 3

[0141] This embodiment provides a temperature control method for a thermal oil furnace, which differs from Embodiment 1 in that the rated difference set in step (3) is 50° C., and the remaining process parameters are the same as those in Embodiment 1.

[0142] Example 4

[0143] This embodiment provides a temperature control method for a thermal oil furnace, which differs from Embodiment 1 in that the rated difference set in step (3) is 5° C., and the other process parameters are the same as those in Embodiment 1.

[0144] Example 5

[0145] This embodiment provides a temperature control method for a thermal oil furnace, which differs from Embodiment 1 in that the rated difference set in step (3) is 70° C., and the remaining process parameters are the same as those in Embodiment 1.

[0146] Comparative Example 1

[0147] This comparative example provides a temperature control method for a thermal oil furnace, which differs from Example 1 in that the main heating furnace 1 and the hot standby furnace 2 jointly provide continuous heating for 24 hours, and the remaining working parameters and connection methods are the same as those of Example 1.

[0148] The present invention uses the temperature control method provided in Examples 1 to 5 to run continuously for one month, and records the electricity used, natural gas, and the number of starts and stops of the second circulation pump 5. The results are shown in Table 1:

[0149] Table 1

[0150] serial number Example 1 Example 2 Example 3 Example 4 Example 5 Power(Kwh) 85461 86444 85405 87798 85342 Natural gas (m3) 135940 143285 136937 146311 136425 Start and stop times 720 1080 393 2160 332

[0151] It can be seen from Table 1 that, compared with Examples 1 to 5, when the heating target temperature is 230°C, the comprehensive energy consumption when the oil outlet temperature of the hot standby furnace 2 is 20°C away from the target temperature is the lowest, and the farther the oil outlet temperature of the hot standby furnace 2 is from the target temperature, the greater the oil pump start-stop interval, and the lower the oil temperature of the hot standby furnace 2.

[0152] Compared with the method provided in Comparative Example 1, the two boilers in Example 1 are used in one and hot standby, and the two hot oil pumps in the original Comparative Example 1 are continuously operated for 24 hours a day, which is reduced to one hot oil pump continuously operating for 24 hours a day, and the cumulative operation time of one hot oil pump is reduced from the original 24 hours a day to no more than 1 hour a day. At the same time, the operation of one 15Kw fan of the hot oil furnace is reduced, which can save 30,000 kWh of electricity and 18,000 m3 of natural gas per month. Comprehensive economic benefits: According to preliminary calculations, Example 1 saves 50,000 yuan per month, and can save 600,000 yuan a year.

[0153] In the temperature control method provided by the present invention, the main heating furnace 1 is in an uninterrupted continuous heating state, while the hot standby furnace 2 is in a hot standby state, and intermittently supplies heat to the energy storage unit 3 according to the oil outlet temperature of the hot standby furnace 2. Compared with the traditional two heating furnaces heating together, it effectively reduces energy consumption and production costs, and avoids starting the hot standby furnace 2 when the temperature of the main heating furnace 1 is low, which causes the system oil temperature to be further lowered, affecting the continuity of the heat demand of the user end 6.

[0154] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

[0155] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A temperature control method for a thermal oil furnace, characterized in that: The temperature control method comprises: (I) providing an energy storage unit, a main heating furnace and at least one hot standby furnace, wherein the main heating furnace and the hot standby furnace are independently and cyclically connected to the energy storage unit, and the energy storage unit provides thermal energy with a target temperature to a user end; (II) controlling the main heating furnace to continuously supply heat to the energy storage unit, so that the heat flowing back from the energy storage unit to the main heating furnace has a first temperature; (III) setting a rated difference, and obtaining a temperature threshold value of the oil outlet temperature change of the hot standby furnace based on the target temperature and the rated difference; (IV) obtaining a real-time oil outlet temperature of the hot standby furnace, and determining a relationship between the real-time oil outlet temperature and a temperature threshold, so as to control the hot standby furnace and the energy storage unit to perform cyclic heat exchange, so that the hot standby furnace is in a "heat standby state", and the heat flowing back from the energy storage unit to the hot standby furnace has a second temperature, wherein the determination method comprises: Determine the relationship between the real-time oil outlet temperature, the first temperature and the temperature threshold; When the real-time oil outlet temperature of the hot standby furnace is lower than the temperature threshold, and the first temperature is higher than the temperature threshold, the hot standby furnace is controlled to be turned on for cyclic heat exchange with the energy storage unit until the temperature of the heat flowing back to the hot standby furnace reaches the target temperature, or until the hot standby furnace continues the cyclic heat exchange for a set time, and then the circulation is stopped; When the real-time oil outlet temperature of the hot standby furnace is greater than or equal to the temperature threshold, and the first temperature of the main heating furnace is greater than the temperature threshold, the continuous heating state of the existing main heating furnace is maintained.

2. The temperature control method according to claim 1, characterized in that: The temperature threshold is a difference between the target temperature and the rated difference.

3. The temperature control method according to claim 1, characterized in that: The target temperature is between 100 and 300° C., and is not equal to 300° C.

4. The temperature control method according to claim 1, characterized in that: The rated difference ranges from 0 to 100°C and is not equal to 100°C.

5. The temperature control method according to claim 4, characterized in that: The rated difference ranges from 10 to 50°C.

6. The temperature control method according to claim 1, characterized in that: In step (IV), the set time is 120~250s.

7. The temperature control method according to claim 1, characterized in that: The temperature control method further comprises: The real-time oil supply temperature of the main heating furnace is obtained, and the relationship between the real-time oil supply temperature and the target temperature is determined to control the switching of the hot standby furnace to continuously supply heat to the energy storage unit.

8. The temperature control method according to claim 7, characterized in that: The determination method includes: When the real-time oil supply temperature of the main heating furnace is lower than the target temperature, the hot standby furnace is switched to continuously supply heat to the energy storage unit, and the main heating furnace is maintained and inspected.

9. The temperature control method according to claim 1, characterized in that: The temperature control method further comprises: Get the real-time heat consumption of the user end; Determine the relationship between the heat energy with the target temperature provided by the energy storage unit and the real-time heat consumption; The hot standby furnace is controlled to start, and together with the main heating furnace, heat is supplied to the energy storage unit.

10. A temperature control device for a thermal oil furnace, characterized in that: The temperature control device is used in the temperature control method of the thermal oil furnace according to any one of claims 1 to 9, and the temperature control device includes a control unit, an energy storage unit, a main heating furnace and at least one hot standby furnace; The main heating furnace and the hot standby furnace are independently and cyclically connected to an energy storage unit, the energy storage unit is used to provide thermal energy to the user end, and the control unit is electrically connected to the energy storage unit, the main heating furnace and the hot standby furnace respectively.

11. The temperature control device according to claim 10, characterized in that: A first circulation pump is provided between the energy storage unit and the main heating furnace, and the first circulation pump is used to drive heat to circulate between the energy storage unit and the main heating furnace; A second circulation pump is provided between the energy storage unit and the hot standby furnace, and the second circulation pump is used to drive heat to circulate between the energy storage unit and the hot standby furnace; The control unit is electrically connected to the first circulation pump and the second circulation pump respectively.

12. The temperature control device according to claim 10, characterized in that: The energy storage unit is also provided with an expansion tank.

13. The temperature control device according to claim 10, characterized in that: The energy storage unit is cyclically connected to the user end.

14. The temperature control device according to claim 10, characterized in that: The control unit includes a first sensor component, a second sensor component, a third sensor component and a fourth sensor component; The first sensor component is disposed at the inlet end of the main heating furnace, and is used to collect the first temperature of the main heating furnace; The second sensor assembly is disposed at the inlet end of the hot standby furnace, and is used to collect the second temperature of the hot standby furnace; The third sensor assembly is arranged at the outlet end of the main heating furnace, and is used to collect the outlet oil temperature of the main heating furnace; The fourth sensor component is arranged at the outlet end of the hot standby furnace and is used to collect the outlet oil temperature of the hot standby furnace.

15. An application of the temperature control device of a thermal oil furnace according to any one of claims 10 to 14, characterized in that: The temperature control device of the heat-conducting oil furnace is applied to the preparation process of the copper-clad laminate.

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