WASTE HEAT SUPPLY CONTROL SYSTEM AND WASTE HEAT SUPPLY CONTROL METHOD

Abstract

To improve heat recovery efficiency.SOLUTION: A waste heat feed control system comprises: a solution furnace; an aging furnace; a communication passage communicating the solution furnace with the aging furnace and feeding waste heat in the solution furnace to the aging furnace; heating means provided at the aging furnace and heating the inside of the aging furnace; outer air feed means of feeding outer air to the inside of the aging furnace; control means controlling the heating means and the outer air feed means; and temperature detection means detecting a temperature at the inside of the aging furnace. The control means reduces the temperature at the inside of the aging furnace by executing control in such a manner that the outer air feed means feeds outer air to the inside of the aging furnace when it is determined that the temperature at the inside of the aging furnace detected by the temperature detection means is a first predetermined value or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a waste heat supply control system for controlling the supply of waste heat and a waste heat supply control method thereof. [Background technology]

[0002] There is known a waste heat supply control system including a solution furnace, an aging furnace, and a communication passage that connects the solution furnace and the aging furnace and supplies waste heat from the solution furnace to the aging furnace (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-014515 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above waste heat supply control system, when the amount of waste heat from the solution furnace to the aging furnace is large, a part of the waste heat is released into the atmosphere, so there is still room for improvement in terms of heat recovery efficiency.

[0005] The present invention has been made to solve such problems, and a main object of the present invention is to provide a waste heat supply control system and a waste heat supply control method capable of improving heat recovery efficiency. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present invention is to A solution furnace; Aging furnace and a communication passage that communicates the solution furnace with the aging furnace and supplies waste heat from the solution furnace to the aging furnace; A heating means provided in the aging furnace for heating the inside of the aging furnace; An outside air supplying means for supplying outside air into the aging furnace; A control means for controlling the heating means and the outside air supply means; A temperature detection means for detecting a temperature in the aging furnace; Equipped with When the control means determines that the temperature in the aging furnace detected by the temperature detection means is equal to or higher than a first predetermined value, the control means controls the outside air supply means to supply outside air into the aging furnace, thereby lowering the temperature in the aging furnace. Waste heat supply control system It is. In this one aspect, the heating means heats the inside of the aging furnace by combustion, the outside air supplying means has a first outside air supplying unit provided in the heating means and supplies the outside air necessary for the combustion to the heating means, and when the control means determines that the temperature inside the aging furnace detected by the temperature detection means is equal to or higher than a first predetermined value, it may control the first outside air supplying unit to supply outside air into the aging furnace, thereby lowering the temperature inside the aging furnace. In this embodiment, the outside air supply means has a second outside air supply unit provided in the aging furnace for supplying outside air into the aging furnace to purge the aging furnace before re-ignition, and when the control means determines that the temperature inside the aging furnace detected by the temperature detection means is equal to or higher than a second predetermined value that is greater than a first predetermined value, the control means may control the first and second outside air supply units to supply outside air into the aging furnace, thereby lowering the temperature inside the aging furnace. In this embodiment, the present invention includes a first exhaust passage having one end connected to the communication passage and the other end open to the atmosphere, a second exhaust passage having one end connected to the aging furnace and the other end connected to the first exhaust passage and communicating with the first exhaust passage, a changeover valve provided at a connection between the communication passage and one end of the first exhaust passage and switching between a state in which the solution furnace is communicated with the atmosphere and a state in which the solution furnace is communicated with the aging furnace, and a changeover valve provided in the solution furnace and for purging the solution furnace before reignition. and a third outside air supply unit which supplies outside air to the solution furnace for purging the solution furnace and the aging furnace, wherein when purging the solution furnace and the aging furnace is performed, the switching valve is switched to a state in which the solution furnace is connected to the atmosphere, the third outside air supply unit supplies outside air into the solution furnace, and the gas in the solution furnace is exhausted to the atmosphere via the first exhaust path, and the second outside air supply unit supplies outside air into the aging furnace, and the gas in the aging furnace is exhausted to the atmosphere via the second exhaust path. In order to achieve the above object, one aspect of the present invention is to A solution furnace; Aging furnace and a communication passage that communicates the solution furnace with the aging furnace and supplies waste heat from the solution furnace to the aging furnace; A heating means provided in the aging furnace for heating the inside of the aging furnace; An outside air supplying means for supplying outside air into the aging furnace; A waste heat supply control method for a waste heat supply control system comprising: when it is determined that the temperature in the aging furnace is equal to or higher than a predetermined value, the outside air supply means is controlled to supply outside air into the aging furnace, thereby lowering the temperature in the aging furnace. Waste heat supply control method for waste heat supply control system may be also possible. Effect of the Invention

[0007] According to the present invention, it is possible to provide a waste heat supply control system and a waste heat supply control method capable of improving heat recovery efficiency. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a schematic configuration of a waste heat supply control system according to an embodiment of the present invention. [Diagram 2] 1 is a block diagram showing a schematic system configuration of a waste heat supply control system according to an embodiment of the present invention; [Diagram 3] 4 is a flowchart showing a flow of a waste heat supply control method by the waste heat supply control system according to the present embodiment. [Figure 4] 1 is a flowchart showing a flow of a purging method for a solution furnace and an aging furnace. [Diagram 5] 4 is a flowchart showing a flow of a waste heat supply control method by the waste heat supply control system according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] EMBODIMENT 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram showing a schematic configuration of a waste heat supply control system according to this embodiment. Fig. 2 is a block diagram showing a schematic system configuration of a waste heat supply control system according to this embodiment. The waste heat supply control system 1 according to this embodiment performs, for example, a process called T6 treatment defined by JIS. In the T6 treatment, heat treatment is performed on an aluminum alloy workpiece using two furnaces, a high-temperature solution furnace 2 and an aging furnace 3 which is lower in temperature than the solution furnace 2.

[0010] First, in a solution furnace 2, the workpiece is solution-treated in an atmosphere of about 500°C to uniformly dissolve any elements that have not been dissolved. Next, the workpiece is immersed in a water tank for quenching. Finally, in an aging furnace 3, aging is performed in an atmosphere of about 200°C to hasten the precipitation of elements dissolved in the workpiece. This allows the required strength to be obtained quickly.

[0011] However, in the conventional T6 treatment, part of the high-temperature waste heat discharged from the solution furnace was released into the atmosphere, so there was room for improvement in terms of heat recovery efficiency.On the other hand, the temperature in the aging furnace 3 was raised from room temperature to around 200°C, which increased the fuel cost to raise the temperature inside the furnace, and wasting energy in this way is not environmentally desirable.

[0012] In contrast, the waste heat supply control system 1 according to this embodiment, as shown in FIG. 2, connects a solution furnace 2 and an aging furnace 3 with a communicating passage 4, and supplies all the waste heat from the solution furnace 2 to the aging furnace 3 through the communicating passage 4.

[0013] As a result, all of the waste heat from the solution furnace 2, which was previously discarded into the atmosphere, is reused as a heat source for heating the aging furnace 3, thereby making it possible to significantly improve the heat recovery efficiency in the aging furnace 3.

[0014] The waste heat supply control system 1 of this embodiment includes a solution furnace 2, an aging furnace 3, a connecting passage 4, a burner 5, a first blower 6, a second blower 7, a third blower 8, a temperature sensor 9, a control device 10, a first exhaust path 11, a second exhaust path 12, and a switching valve 13.

[0015] As described above, the solution treatment is carried out in the solution furnace 2, and the aging treatment is carried out in the aging furnace 3. Gas leak detectors 14, 15 are provided in the solution furnace 2 and the aging furnace 3, respectively, for safety purposes.

[0016] One end of the communication passage 4 is connected to the solution furnace 2, and the other end is connected to the aging furnace 3. The communication passage 4 connects the solution furnace 2 and the aging furnace 3, and supplies high-temperature waste heat from the solution furnace 2 to the aging furnace 3. An exhaust damper 16 that opens when a certain level of pressure is applied is provided near the connection of one end of the communication passage 4 with the solution furnace 2. The communication passage 4 is made of piping and the like. The communication passage 4 is made of stainless steel and the like because it carries high-temperature waste heat.

[0017] The burner 5 is a specific example of a heating means. The burner 5 is provided in the aging furnace 3 and heats the inside of the aging furnace 3. The burner 5 performs heating by, for example, burning gas. The burner 5 has, for example, a main flame that performs main heating and a pilot flame that performs auxiliary heating (pilot flame).

[0018] The first blower 6 is a specific example of a first outside air supply unit. The first blower 6 is provided in the burner 5. The first blower 6 supplies the outside air required for combustion to the burner 5. The first blower 6 increases the amount of outside air supplied, so that the outside air can be supplied to the burner 5 for combustion and the outside air can be supplied into the aging furnace 3 at the same time.

[0019] The second blower 7 is a specific example of a second outside air supply unit. The second blower 7 is provided in the aging furnace 3. The second blower 7 supplies outside air into the aging furnace 3 to purge the aging furnace 3 before reignition in the event of a misfire or the like.

[0020] The third blower 8 is a specific example of a third outside air supply unit. The third blower 8 is provided in the solution furnace 2. The third blower 8 supplies outside air into the solution furnace 2 in order to purge the solution furnace 2 before reignition in the event of a misfire or the like.

[0021] The temperature sensor 9 is a specific example of a temperature detection means. The temperature sensor 9 is provided in the aging furnace 3. The temperature sensor 9 detects the temperature in the aging furnace 3. The temperature sensor 9 outputs the detected temperature in the aging furnace 3 to the control device 10.

[0022] The control device 10 is a specific example of a control means. The control device 10 has a hardware configuration of a normal computer including a processor 10a such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), an internal memory 10b such as a RAM (Random Access Memory) or a ROM (Read Only Memory), a storage device 10c such as a HDD (Hard Disk Drive) or a SDD (Solid State Drive), an input / output I / F 10d for connecting peripheral devices such as a display, and a communication I / F 10e for communicating with devices outside the device.

[0023] The control device 10 controls the burner 5, the first blower 6, the second blower 7, the third blower 8, and the switching valve 13. For example, the control device 10 performs feedback control of the heating power of the burner 5 based on the temperature inside the aging furnace 3 detected by a temperature sensor 9 so that the temperature inside the aging furnace 3 becomes a constant temperature. For example, the control device 10 controls the heating power of the burner 5 by controlling the amount of gas supplied to the burner 5.

[0024] One end of the first exhaust passage 11 is connected to the communication passage 4. The other end of the first exhaust passage 11 is open to the atmosphere. One end of the second exhaust passage 12 is connected to the aging furnace 3. An exhaust damper 17 that opens when a certain pressure or more is applied is provided near the connection part of one end of the second exhaust passage 12 with the aging furnace 3. The other end of the second exhaust passage 12 is connected to the first exhaust passage 11 and communicates with the first exhaust passage 11.

[0025] The switching valve 13 is provided at a connection between the communication passage 4 and one end of the first exhaust passage 11. The switching valve 13 is, for example, a three-way valve. The switching valve 13 is driven by an actuator such as a motor. The switching valve 13 switches between a state in which the solution furnace 2 is connected to the atmosphere and a state in which the solution furnace 2 is connected to the aging furnace 3. When the solution furnace 2 is connected to the atmosphere, the communication between the solution furnace 2 and the aging furnace 3 is cut off.

[0026] Next, a specific description will be given of a waste heat supply control method by the waste heat supply control system 1 according to this embodiment. Fig. 3 is a flowchart showing a flow of the waste heat supply control method by the waste heat supply control system according to this embodiment.

[0027] A solution treatment is carried out in the solution furnace 2, and all waste heat in the solution furnace 2 is supplied to the aging furnace 3 through the communication passage 4 (step S101).

[0028] The control device 10 controls the heat of the burner 5 based on the temperature inside the aging furnace 3 detected by the temperature sensor 9 (step S102).

[0029] The control device 10 judges whether or not the temperature inside the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than a first predetermined value (step S103).

[0030] When the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than the first predetermined value (YES in step S103), it controls the burner 5 and the first blower 6 to lower the temperature inside the aging furnace 3 (step S104).

[0031] Specifically, when the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than a first predetermined value, it performs control to stop the supply of gas to the main frame while continuing the supply of gas to the pilot flame of the burner 5.

[0032] Furthermore, the control device 10 controls the amount of outside air supplied to the aging furnace 3 by the first blower 6 so that the temperature inside the aging furnace 3 is kept constant. By supplying outside air to the aging furnace 3 by the first blower 6, the temperature inside the aging furnace 3 can be maintained at a constant temperature equal to or lower than a first predetermined value. In this way, the temperature inside the aging furnace 3 can be lowered by effectively using the existing first blower 6, which also leads to a reduction in equipment costs.

[0033] When the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is lower than the first predetermined value (NO in step S103), the process returns to the above (step S101).

[0034] Next, a description will be given of a method for purging the solution furnace 2 and the aging furnace 3. For example, when the solution furnace 2 and the aging furnace 3 are abnormally stopped, purging is performed as follows before reigniting the solution furnace 2 and the aging furnace 3. Figure 4 is a flow chart showing the flow of the method for purging the solution furnace and the aging furnace.

[0035] The control device 10 controls the switching valve 13 to make the solution furnace 2 communicate with the atmosphere (step S201). The control device 10 controls the second blower 7 so that the second blower 7 supplies outside air into the solution furnace 2 (step S202). As a result, the gas in the solution furnace 2 passes through the exhaust damper 16 and the first exhaust path 11 and is exhausted into the atmosphere (step S203). In this way, the waste heat gas from the solution furnace 2 does not flow through the first exhaust path 11, and only the low-temperature exhaust gas from the purging flows. For this reason, there is no need to use high-temperature SUS material or the like for the first exhaust path, which leads to a reduction in equipment costs.

[0036] At the same time, the control device 10 controls the third blower 8 so that the third blower 8 supplies outside air into the aging furnace 3 (step S204). As a result, the gas in the aging furnace 3 passes through the exhaust damper 17 and the second exhaust path 12 and is exhausted into the atmosphere (step S205).

[0037] EMBODIMENT 2 In this embodiment, when the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than a second predetermined value that is higher than the first predetermined value, the control device 10 controls the first and second blowers 6, 7 to supply outside air into the aging furnace 3, thereby lowering the temperature inside the aging furnace 3. In this way, when the temperature inside the aging furnace 3 becomes higher, the temperature inside the aging furnace 3 can be more reliably lowered by supplying outside air into the aging furnace 3 using the first and second blowers 6, 7.

[0038] FIG. 5 is a flowchart showing the flow of a waste heat supply control method by the waste heat supply control system according to this embodiment.

[0039] A solution treatment is carried out in the solution furnace 2, and all waste heat in the solution furnace 2 is supplied to the aging furnace 3 through the communication passage 4 (step S301).

[0040] The control device 10 controls the heat of the burner 5 based on the temperature inside the aging furnace 3 detected by the temperature sensor 9 (step S302).

[0041] The control device 10 judges whether or not the temperature inside the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than a first predetermined value (step S303).

[0042] When the control device 10 determines that the temperature in the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than the first predetermined value (YES in step S303), it determines whether the temperature in the aging furnace 3 is equal to or higher than a second predetermined value (step S304).

[0043] When the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is equal to or higher than the second predetermined value (YES in step S304), it controls the burner 5 and the first and second blowers 6, 7 to lower the temperature inside the aging furnace 3 (step S305). In this way, the temperature inside the aging furnace 3, which has become high, can be lowered by effectively using the existing first and second blowers 6, 7, which also leads to a reduction in equipment costs.

[0044] On the other hand, when the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is lower than the second predetermined value (NO in step S304), it controls the burner 5 and the first blower 6 to lower the temperature inside the aging furnace 3 (step S306).

[0045] When the control device 10 determines that the temperature inside the aging furnace 3 detected by the temperature sensor 9 is lower than the first predetermined value (NO in step S303), the process returns to the above (step S301).

[0046] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims.

[0047] The present invention can also be realized by causing a processor to execute a computer program to perform the processes shown in, for example, FIGS.

[0048] The program can be stored and provided to a computer using various types of non-transitory computer readable media. The non-transitory computer readable media includes various types of tangible storage media. Examples of the non-transitory computer readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / Ws, and semiconductor memories (e.g., mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs), flash ROMs, and RAMs (random access memories)). The program may be provided to the computer by various types of transitory computer readable media. Examples of the transitory computer readable medium include an electric signal, an optical signal, and an electromagnetic wave. The transitory computer readable medium can provide the program to the computer via a wired communication path such as an electric wire and an optical fiber, or via a wireless communication path.

[0049] Each part constituting the control device 10 according to each of the above-mentioned embodiments can be realized not only by a program, but also in part or in whole by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). [Explanation of symbols]

[0050] 1 waste heat supply control system, 2 solution furnace, 3 aging furnace, 4 communication passage, 5 burner, 6 first blower, 7 second blower, 8 third blower, 9 temperature sensor, 10 control device, 10a processor, 10b internal memory, 10c storage device, 11 first exhaust path, 12 second exhaust path, 13 switching valve, 14 gas leak detector, 15 gas leak detector, 16 exhaust damper, 17 exhaust damper

Claims

1. A solution furnace; Aging furnace and a communication passage that communicates the solution furnace with the aging furnace and supplies waste heat from the solution furnace to the aging furnace; a heating means provided in the aging furnace for heating the inside of the aging furnace by combustion; an outside air supplying means including a first outside air supplying section provided in the heating means for supplying the heating means with outside air necessary for the combustion, and a second outside air supplying section provided in the aging furnace for supplying outside air into the aging furnace in order to purge the aging furnace before reignition; A control means for controlling the heating means and the outside air supply means; A temperature detection means for detecting a temperature in the aging furnace; Equipped with The control means When it is determined that the temperature in the aging furnace detected by the temperature detection means is equal to or higher than a first predetermined value, the first outside air supply unit is controlled to supply outside air into the aging furnace, thereby lowering the temperature in the aging furnace; when it is determined that the temperature in the aging furnace detected by the temperature detection means is equal to or higher than a second predetermined value which is greater than a first predetermined value, the first and second outside air supply units are controlled to supply outside air into the aging furnace, thereby lowering the temperature in the aging furnace. Waste heat supply control system.

2. 2. The waste heat supply control system according to claim 1, a first exhaust passage having one end connected to the communication passage and the other end open to the atmosphere; a second exhaust passage having one end connected to the aging furnace and the other end connected to the first exhaust passage and communicating with the first exhaust passage; a changeover valve provided at a connection between the communication passage and one end of a first exhaust passage, the changeover valve being switched between a state in which the solution treatment furnace is communicated with the atmosphere and a state in which the solution treatment furnace is communicated with the aging furnace; a third outside air supply unit provided in the solution furnace for supplying outside air to the solution furnace in order to purge the solution furnace before reignition; Further comprising: When purging the solution furnace and the aging furnace, The switching valve is switched to a state in which the solution furnace is connected to the atmosphere, The third outside air supply unit supplies outside air into the solution furnace, and the gas in the solution furnace is exhausted to the atmosphere through the first exhaust path; The second outside air supply unit supplies outside air into the aging furnace, and the gas in the aging furnace is exhausted to the atmosphere through the second exhaust path. Waste heat supply control system.

3. A solution furnace; Aging furnace and a communication passage that communicates the solution furnace with the aging furnace and supplies waste heat from the solution furnace to the aging furnace; a heating means provided in the aging furnace for heating the inside of the aging furnace by combustion; Supplying outside air into the aging furnace an outside air supplying means including a first outside air supplying section provided in the heating means for supplying the heating means with outside air necessary for the combustion, and a second outside air supplying section provided in the aging furnace for supplying outside air into the aging furnace in order to purge the aging furnace before reignition; A waste heat supply control method for a waste heat supply control system comprising: When it is determined that the temperature in the aging furnace is equal to or higher than a first predetermined value, the first outside air supply unit is controlled to supply outside air into the aging furnace, thereby lowering the temperature in the aging furnace; When it is determined that the temperature in the aging furnace is equal to or higher than a second predetermined value that is greater than the first predetermined value, the first and second outside air supply units are controlled to supply outside air into the aging furnace, thereby lowering the temperature in the aging furnace. A waste heat supply control method for a waste heat supply control system.

Images