Heat collection heating / cooling system

Abstract

To provide a heat collection heating / cooling system which can enhance a heat collection rate by further effectively using heat which is possessed by hot water even if exhaust hot water from which heat is collected by a heat exchange in a cooling step of a self-heat collection system is lowered in a temperature in a low-temperature area which cannot be used in a heating step due to the lowering of the temperature.SOLUTION: A heat collection heating / cooling system comprises: an exhaust heat use heating device 10 for producing steam by collecting the heat of heat collection water from an auxiliary cooler 6; an exhaust heat use cooling device 20 for producing cooling water for cooling a cooler 7 by collecting the heat of heat collection water which is exchanged in heat by the exhaust heat use heating device 10; a preheat water heat exchanger 9 for exchanging heat between preheat water which is raised in a temperature by being exchanged in heat by the exhaust heat use cooling device 20 and a part of heat source hot water from a heater 2; and a preheater 1 for preheating a heat treatment object W by the preheat water which is exchanged in heat by the preheat water heat exchanger 9. The heat collection water flows in a heat collection water circulation path L1, and the preheat water flows in a preheat water circulation path L3.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a heat recovery heating and cooling system that can more effectively utilize the heat contained in waste hot water, even if the temperature of the waste hot water from which heat has been extracted by heat exchange in the cooling process of a self-heat recovery system drops and becomes low-temperature waste hot water that cannot be used in the heating process, thereby increasing the heat recovery rate. [Background technology]

[0002] In the process of heating and heat-treating products, the cooling water used in the process of cooling the products after heat treatment is heated by heat exchange with the products and is discarded as waste hot water.Therefore, there is a self-heat recovery system that aims to reduce the energy consumption of the entire system by returning a portion of this waste hot water to the heating process.

[0003] Patent document 1 describes an energy-saving system in which exhaust heat generated in other processes during the production of carbonated beverages is utilized in a heating process, and the exhaust heat is then used as a heat source for an adsorption or absorption chiller in the cooling process. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-130195 Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional self-heat recovery systems, the waste hot water that has been subjected to heat exchange in the cooling process for cooling the heat-treated product is often discarded without being able to be used in the heating process due to a drop in temperature.

[0006] The present invention has been made in consideration of the above, and aims to provide a heat recovery heating and cooling system that can more effectively utilize the heat contained in the waste hot water, even if the temperature of the waste hot water from which heat has been extracted by heat exchange in the cooling process of a self-heat recovery system drops and becomes low-temperature waste hot water that cannot be used in the heating process, thereby increasing the heat recovery rate. [Means for solving the problem]

[0007] In order to solve the above problems and achieve the object, the present invention provides a heat recovery heating and cooling system in which an object to be heat-treated is heated in stages through a series of heaters, then heat-treated, and the heat-treated object is cooled in stages through a series of coolers, and a part of the heat of the heat-source hot water that has been heat-exchanged by the coolers is returned to the heater and circulated, the heat recovery heating and cooling system comprising: a waste heat recovery device that recovers heat from the heat recovery water that has been heat-exchanged by the coolers and has a higher temperature, to generate steam; and a waste heat recovery cooling device that recovers heat from the heat recovery water that has been heat-exchanged by the waste heat recovery heating device and has a lower temperature, to generate cooling water for cooling the coolers. a preheated water heat exchanger that exchanges heat between preheated water, which is cooling water that has been heat exchanged by the exhaust heat cooling device and heated, and a portion of the heat source hot water that has been heat exchanged by the heater; and a preheater that is provided before the series of heaters and preheats the object to be heat treated with the preheated water that has been heated by the preheated water heat exchanger, wherein the heat recovery water flows through a heat recovery water circulation path that circulates through the cooler, the exhaust heat utilization heating device, and the exhaust heat utilization cooling device in sequence and returns to the cooler, and the preheated water flows through a preheated water circulation path that circulates through the exhaust heat utilization cooling device, the preheated water heat exchanger, and the preheater in sequence and returns to the exhaust heat utilization cooling device.

[0008] In addition, the heat recovery heating and cooling system of the present invention is characterized in that, in the above invention, a portion of the heat source hot water whose temperature has been reduced by heat exchange in the preheated water heat exchanger is supplied as heated water to the exhaust heat utilization heating device.

[0009] In addition, the heat recovery heating and cooling system of the present invention, in the above invention, is characterized in that a later-stage cooler among the coolers is cooled by chiller cooling water generated and circulated by a cold water chiller, and is equipped with a cooling water heat exchanger that exchanges heat between the chiller cooling water that is heat exchanged by the later-stage cooler and returned to the cold water chiller, and auxiliary cooling water that is cooling water output from the exhaust heat utilization cooling device, and the auxiliary cooling water flows through an auxiliary cooling water circulation path that circulates between the exhaust heat utilization cooling device and the cooling water heat exchanger, and cools the chiller cooling water that returns to the cold water chiller.

[0010] In addition, the heat recovery heating and cooling system of the present invention is characterized in that, in the above invention, steam is supplied to the heater from a steam generating device via a steam piping, the exhaust heat utilization heating device is a heat pump type steam generating device, the generated steam merges with the steam piping and is supplied to the heater, and the exhaust heat utilization cooling device is an ejector cooling device.

[0011] Further, in the above-mentioned invention, the heat recovery heating and cooling system according to the present invention further comprises a temperature sensor provided on an outlet side of a heat recovery water circulation path of the cooler for measuring a temperature of the heat recovery water, a bypass pipe connecting a branching point of the heat recovery water circulation path between the cooler and the exhaust heat recovery heating device and a joining point of the heat recovery water circulation path between the exhaust heat recovery heating device and the exhaust heat recovery cooling device and bypassing the exhaust heat heating device, a changeover valve provided at the branching point for switching the supply of the heat recovery water between the exhaust heat recovery heating device side and the bypass pipe side, a circulation pump provided in the heat recovery water circulation path between the exhaust heat recovery cooling device and the cooler for circulating the heat recovery water, and The present invention is characterized in that it comprises a control unit that performs control such that, based on the measured heat recovery water temperature, if the heat recovery water temperature is less than a first temperature and equal to or greater than a second temperature, the switching valve is switched to the exhaust heat heating device side to operate the circulation pump, the exhaust heat heating device, and the exhaust heat cooling device, and if the heat recovery water temperature is less than the second temperature and equal to or greater than a third temperature, the switching valve is switched to the bypass piping side to stop the exhaust heat heating device and operate the circulation pump and the exhaust heat cooling device, and if the heat recovery water temperature is less than the third temperature, the switching valve is switched to the bypass piping side to stop the circulation pump, the exhaust heat heating device, and the exhaust heat cooling device. Effect of the Invention

[0012] According to the present invention, even if the temperature of the waste hot water from which heat has been extracted by heat exchange in the cooling process of the self-heat recovery system drops and becomes low-temperature waste hot water that cannot be used in the heating process, the heat contained in the waste hot water can be more effectively utilized to increase the heat recovery rate. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a circuit diagram showing the configuration of a waste heat utilization heating device applied to a heat recovery heating and cooling system according to this embodiment. [Diagram 2] FIG. 2 is a circuit diagram showing the configuration of a waste heat utilization cooling device that is applied to the heat recovery heating and cooling system of this embodiment. [Diagram 3] FIG. 3 is a diagram showing the overall configuration of a heat recovery heating and cooling system according to an embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing operation modes and their contents. [Diagram 5] FIG. 5 is a flowchart showing an example of an operation mode control procedure performed by the control unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0015] First, a description will be given of the exhaust heat recovery heating device 10 and the exhaust heat recovery cooling device 20 that are applied to the heat recovery heating and cooling system 101 according to this embodiment.

[0016] <Waste heat utilization heating device> 1 is a circuit diagram showing the configuration of an exhaust heat recovery heating device 10 applied to a heat recovery heating and cooling system 101 according to the present embodiment. The exhaust heat recovery heating device 10 is a heat pump type steam generating device that recovers heat from exhaust hot water (heat source hot water) and generates and outputs saturated steam using the recovered heat.

[0017] As shown in FIG. 1, the exhaust heat utilization heating device 10 forms a heat pump cycle in which a compressor 11 that compresses a refrigerant, a condenser 12 that condenses the refrigerant compressed by the compressor 11 by heat exchange with water to be heated, an expansion valve 13 that reduces the pressure of the refrigerant condensed in the condenser 12, and an evaporator 14 that evaporates the refrigerant expanded by the expansion valve 13 using heat recovered from the heat source hot water are connected in a ring shape.

[0018] The evaporator 14 is supplied with heat-source hot water from a connection point 14A, and the heat-source hot water that has been cooled by heat exchange with the refrigerant is discharged from a connection point 14B. The condenser 12 is supplied with water to be heated from a connection point 12A, heats the water to be heated, generates water vapor, and outputs the water vapor from a connection point 12B.

[0019] <Waste heat cooling device> Fig. 2 is a circuit diagram showing the configuration of the exhaust heat recovery cooling device 20 applied to the heat recovery heating and cooling system 101 of this embodiment. The exhaust heat recovery cooling device 20 is an ejector cooling device, and as shown in Fig. 2, it is a device that uses heat source hot water supplied from a connection point 22A to cool the cooled water from a connection point 26A and outputs it as cooling water.

[0020] The exhaust heat recovery cooling device 20 has a refrigerant pump 21, a steam generator 22, an ejector 23, a condenser 24, an expansion valve 25, and an evaporator 26. The refrigerant pump 21 pressurizes the liquid phase refrigerant to circulate the refrigerant in the circuit. The steam generator 22 exchanges heat between the refrigerant discharged from the refrigerant pump 21 and the heat-source hot water supplied from a connection point 22A, and evaporates the refrigerant. The heat-exchanged heat-source hot water is discharged from a connection point 22B.

[0021] The refrigerant evaporated in the steam generator 22 is supplied to the driving flow port of the ejector 23, and the ejector 23 supplies the refrigerant from the discharge port to the condenser 24. The condenser 24 condenses the refrigerant by heat exchange between the gas-phase refrigerant supplied from the ejector 23 and the cooling water supplied from a connection point 24A. The refrigerant condensed in the condenser 24 is introduced into the refrigerant pump 21 and circulates in the circuit, and a part of it is branched off and supplied to the evaporator 26 via an expansion valve 25. The cooling water that has exchanged heat with the refrigerant is discharged from a connection point 24B as preheated water, which will be described later.

[0022] The expansion valve 25 controls the liquid refrigerant to a predetermined low pressure. In the evaporator 26, the refrigerant decompressed by the expansion valve 25 is evaporated by heat exchange with the cooled water supplied from the connection point 26A. The refrigerant evaporated in the evaporator 26 is sucked from the suction port of the ejector 23. In the evaporator 26, the refrigerant becomes a low-pressure refrigerant generated by the suction action of the ejector 23, and the latent heat is utilized to generate cooling water and output from the connection point 26B. In the ejector 23, the high-pressure refrigerant introduced from the driving flow port is decompressed by the nozzle and ejected. At this time, the refrigerant is sucked into the inside of the main body as a suction flow through the suction port, and the driving flow and the suction flow are mixed and pressurized, and discharged from the discharge port.

[0023] <Overall configuration of heat recovery heating and cooling system> FIG. 3 is a diagram showing the overall configuration of a heat recovery heating and cooling system 101 according to an embodiment of the present invention. The heat recovery heating and cooling system 101 is premised on a configuration in which a heat treatment object W is heated through a series of heaters 2 and 3, and then heat-treated, and the heat-treated heat treatment object W is cooled through a series of coolers 5 and 7, and a part of the heat of the heat source hot water heat-exchanged by the cooler 5 is returned to the heater 2 and circulated. In the heat recovery heating and cooling system 101 according to this embodiment, sterilized water is generated using water as the heat treatment object, but this is not limited thereto, and the heat treatment object may be a product or the like. In this embodiment, room temperature water (20 to 30°C) is heated stepwise by the heaters 2 and 3, and the heated water at 100 to 130°C is held in the sterilization treatment device 4 for a certain period of time to generate sterilized water, and then the sterilized water is cooled by the coolers 5 and 7 and output as sterilized water at 20 to 30°C. The number of stages of the heaters 2, 3 and the coolers 5, 7 varies depending on the heat treatment temperature of the heat treatment object W, the heating capacity of the heaters 2, 3, and the cooling capacity of the coolers 5, 7.

[0024] As shown in FIG. 3, the heat recovery heating and cooling system 101 includes a boiler 100, a cooling tower 31, and a cold water chiller 30. The boiler 100 is a steam generating device that generates steam at 120 to 150°C and supplies it to the heater 3. The heat source hot water (90 to 100°C) that has been heat exchanged in the heater 3 merges with the heat source hot water that has been heated to 70 to 80°C by heat exchange in the cooler 5 at a junction PT2 to become heat source hot water of 80 to 90°C, and is supplied to the heater 2 disposed in the front stage of the heater 3. The heater 2 becomes heat source hot water of 60 to 70°C by heat exchange, and is supplied to the cooler 5. Therefore, the heat source hot water flows through a heat source hot water circulation path L10 that circulates between the heater 2 and the cooler 5. A circulation pump P10 for circulating the heat source hot water is disposed in the heat source hot water circulation path L10.

[0025] The chilled water chiller 30 generates chiller cooling water (10 to 20°C) to be supplied to the cooler 7. The chilled water chiller 30 generates chiller cooling water by a built-in refrigerator (not shown), and exchanges the exhaust heat with water circulating between the chiller 30 and the cooling tower 31, dissipating the heat into the atmosphere. The generated chiller cooling water is heat exchanged by the cooler 7, and then further cooled through the cooling water heat exchanger 8 described below, and returns to the chilled water chiller 30 as chiller cooling water at 25 to 35°C. The chiller cooling water circulates through the chiller cooling water circulation path L30 via the chiller 30, the cooler 7, and the cooling water heat exchanger 8. As a result, the cooler 7 cools the sterilized water at 60 to 70°C to 20 to 30°C and outputs it. The chiller cooling water circulation path L30 is provided with a circulation pump P30 for circulating the chiller cooling water. In addition, a circulation pump P31 for circulating water is provided in the circulation path between the cooling tower 31 and the cold water chiller 30.

[0026] In this embodiment, a preheater 1, a preheated water heat exchanger 9, an auxiliary cooler 6, a waste heat heating device 10, a waste heat cooling device 20, and a cooling water heat exchanger 8 are further provided. The preheater 1 is provided in front of the heater 2. The auxiliary cooler 6 is provided between the cooler 5 and the cooler 7. The preheater 1 preheats the water (20 to 30°C) of the heat treatment object W to 30 to 65°C before supplying it to the heater 2, and outputs the preheated water to the heater 2. The auxiliary cooler 6 is a cooler, and cools the sterilized water cooled to 80 to 90°C by the cooler 5 to 60 to 70°C, and outputs it to the cooler 7. As a result, three stages of heaters are arranged in the heating process, and three stages of coolers are arranged in the cooling process.

[0027] A heat recovery water circulation path L1 is formed between the sub-cooler 6, the exhaust heat utilization heating device 10, and the exhaust heat utilization cooling device 20. The heat recovery water that has recovered heat by heat exchange in the sub-cooler 6 is supplied to the evaporator 14 of the exhaust heat utilization heating device 10 via the heat recovery water circulation path L1, the heat recovery water that has recovered heat by the evaporator 14 is supplied to the steam generator 22 of the exhaust heat utilization cooling device 20 via the heat recovery water circulation path L1, and the heat recovery water that has recovered heat by the steam generator 22 returns to the sub-cooler 6 via the heat recovery water circulation path L1. The temperature of the heat recovery water output from the sub-cooler 6 is 70 to 90°C, and becomes 60 to 80°C after heat recovery by the exhaust heat utilization heating device 10. This heat recovery water at 60 to 80°C is heat recovered by the exhaust heat utilization cooling device 20 and input to the sub-cooler 6 as heat recovery water at 50 to 70°C. A circulation pump P1 for circulating the heat recovery water is disposed in the heat recovery water circulation path L1 between the exhaust heat recovery cooling device 20 and the sub-cooler 6. As a result, the exhaust heat recovery heating device 10 effectively utilizes the heat recovery water, improving the overall heat recovery efficiency.

[0028] An auxiliary cooling water circulation path L2 is formed between the exhaust heat cooling device 20 and the cooling water heat exchanger 8. The cooling water heat exchanger 8 exchanges heat between the chiller cooling water that is heat exchanged by the cooler 7 and returns to the chilled water chiller 30 and the auxiliary cooling water, which is cooling water output from the evaporator 26 of the exhaust heat cooling device 20, and cools the chiller cooling water. The cooling water (cooled water) at 25 to 35°C output from the cooling water heat exchanger 8 is cooled by the evaporator 26 of the exhaust heat cooling device 20 and returns to the cooling water heat exchanger 8 as cooling water (auxiliary cooling water) at 20 to 30°C. A circulation pump P2 for circulating the auxiliary cooling water is disposed in the auxiliary cooling water circulation path L2. This can reduce the cooling load of the chilled water chiller 30. In addition, by exchanging heat with the heat recovery water in the auxiliary cooler 6 and recovering heat, the temperature of the heat treatment target W entering the cooler 7 is lowered, and in this respect, the cooling load of the chilled water chiller 30 that cools the cooler 7 can be reduced. Moreover, the exhaust heat recovery cooling device 20 utilizes the heat recovery water discharged from the exhaust heat recovery heating device 10, which further improves the overall heat recovery efficiency. Note that the cooler 7 may be directly cooled using the cooling water output from the evaporator 26 of the exhaust heat recovery cooling device 20.

[0029] A preheated water circulation path L3 is formed between the exhaust heat cooling device 20 and the preheater 1 via the preheated water heat exchanger 9. The preheated water heat exchanger 9 exchanges heat between the preheated water of 35 to 45°C discharged from the condenser 24 of the exhaust heat cooling device 20 and a part of the heat source hot water of 60 to 70°C that has been heat exchanged by the heater 2. That is, the preheated water of 35 to 45°C discharged from the condenser 24 of the exhaust heat cooling device 20 is heated as preheated water of 50 to 60°C and supplied to the preheater 1. The preheater 1 uses the preheated water of 50 to 60°C to heat the water (20 to 30°C) of the heat treatment object W input to the preheater 1 to 35 to 65°C, and the preheated water of 25 to 35°C from which heat has been discharged is returned to the condenser 24 of the exhaust heat cooling device 20. A part of the heat source hot water of 60 to 70°C that has been heat exchanged by the heater 2 is discharged by the pump P11. The preheating load can be reduced by preheating using the exhaust heat of the preheater 1 using the preheated water circulation path L3. This further improves the overall heat recovery efficiency.

[0030] A part of the heat source hot water of 50 to 60°C discharged by the preheated water heat exchanger 9 is supplied as heated water to the condenser 12 of the exhaust heat recovery heating device via the branch point PT5, and the remaining heat source hot water is discharged to the outside. Then, steam of 120 to 150°C generated by the condenser 12 of the exhaust heat recovery heating device is supplied to the heater 3 via the junction point PT1 of the steam piping between the boiler 100 and the heater 3. As a result, the feed water temperature of the heated water, which was conventionally about 20°C, is raised to about 50 to 60°C, thereby reducing the heating load of the exhaust heat recovery heating device 10 and increasing efficiency.

[0031] In addition, in this embodiment, since the steam generated by the exhaust heat recovery heating device 10 is joined at the joining point PT1 of the steam pipes, the effect of reducing the heating power of the boiler 100 can be obtained.

[0032] <Operation mode control> Incidentally, when the production line for the heat treatment object W using the heat recovery heating and cooling system 101 starts and the heating process and cooling process are stabilized, or when the heat treatment object W is supplied in batches and the temperature changes in the heating process and cooling process, the outlet temperature of the heat recovery water discharged from the auxiliary cooler 6 (heat recovery water temperature T1) fluctuates. If the heat recovery water temperature T1 does not reach a temperature at which the exhaust heat recovery heating device 10 and the exhaust heat recovery cooling device 20 can operate, if the system is operated as is, high-temperature steam is not generated, the load on the boiler 100 increases, or the temperature of the auxiliary cooling water output by the exhaust heat recovery cooling device 20 increases, and the temperature of the chiller cooling water returning to the chilled water chiller 30 increases, which increases the load on the chilled water chiller 30 and deteriorates the efficiency of the entire system. Therefore, the control unit C operates by changing the operation mode according to the heat recovery water temperature T1 of the heat recovery water that has collected heat in the auxiliary cooler 6.

[0033] As shown in Fig. 3, a temperature sensor S for measuring the temperature of the heat recovery water is provided at the outlet side of the heat recovery water discharged from the sub-cooler 6. A bypass pipe LB1 is provided between a branch point PT3 provided in the heat recovery water circulation path L1 connecting the sub-cooler 6 and the exhaust heat recovery heating device 10 and a junction point PT4 provided in the heat recovery water circulation path L1 connecting the exhaust heat recovery heating device 10 and the exhaust heat recovery cooling device 20, and bypasses the exhaust heat recovery heating device 10. A switching valve V1 for switching the supply of heat recovery water between the exhaust heat recovery heating device side A10 and the bypass pipe side A20 is provided at the branch point PT3. The control unit C is connected to the temperature sensor S, the switching valve V1, the circulation pump P1, the exhaust heat recovery heating device 10, and the exhaust heat recovery cooling device 20.

[0034] 4, based on the heat recovery water temperature T1 measured by the temperature sensor S, when the heat recovery water temperature T1 is less than a first temperature (e.g., 100°C) and is equal to or greater than a second temperature (e.g., 70°C), the control unit C switches the switching valve V1 to the exhaust heat utilization heating device side A10 as the operation mode M1 to operate the circulation pump P1, the exhaust heat utilization heating device 10 which is a heat pump type steam generating device, and the exhaust heat utilization cooling device 20 which is an ejector cooling device. Also, when the heat recovery water temperature T1 is less than the second temperature and equal to or greater than a third temperature (e.g., 60°C), that is, when the heat recovery water temperature T1 is below the operating range of the exhaust heat utilization heating device 10 and within the operating range of the exhaust heat utilization cooling device 20, the control unit C switches the switching valve V1 to the bypass piping side A20 as the operation mode M2 ​​to stop the exhaust heat utilization heating device 10 and operate the circulation pump P1 and the exhaust heat utilization cooling device 20. Furthermore, when the heat recovery water temperature T1 is lower than the third temperature, i.e., when the heat recovery water temperature T1 is lower than the operating ranges of both the exhaust heat recovery heating device 10 and the exhaust heat recovery cooling device 20, the control unit C performs control as the operation mode M3 to switch the switching valve V1 to the bypass piping side A20 and stop the circulation pump P1, the exhaust heat recovery heating device 10, and the exhaust heat recovery cooling device 20. Note that when the heat recovery water temperature T1 is 100°C or higher, all devices in the heat recovery water circulation path L1 are stopped to avoid problems such as a breakdown of the circulation pump P1 due to the vaporization of the heat recovery water.

[0035] <Operation mode control procedure by the control unit> Fig. 5 is a flowchart showing an example of an operation mode control procedure by the control unit C. As shown in Fig. 5, the control unit C first measures the heat recovery water temperature T1 (step S101). Then, it determines whether the heat recovery water temperature T1 is less than 60°C (step S102). If the heat recovery water temperature T1 is less than 60°C (step S102: Yes), it controls in the operation mode M3 (step S105) and proceeds to step S101.

[0036] On the other hand, if the heat recovery water temperature T1 is not less than 60°C (step S102: No), it is further determined whether the heat recovery water temperature T1 is equal to or greater than 60°C and less than 70°C (step S103). If the heat recovery water temperature T1 is equal to or greater than 60°C and less than 70°C (step S103: Yes), control is performed in the operation mode M2 ​​(step S106), and the process proceeds to step S101.

[0037] If the heat recovery water temperature T1 is not equal to or higher than 60°C and lower than 70°C (step S103: No), it is further determined whether the heat recovery water temperature T1 is equal to or higher than 70°C and lower than 100°C (step S104). If the heat recovery water temperature T1 is equal to or higher than 70°C and lower than 100°C (step S104: Yes), control is performed using the operation mode M1 (step S107), and the process proceeds to step S101.

[0038] On the other hand, if the heat recovery water temperature T1 is not equal to or higher than 70° C. and lower than 100° C. (step S104: No), all devices on the heat recovery water circulation path L1 are stopped (step S108), and this process is terminated.

[0039] In this embodiment, the exhaust heat from the exhaust heat utilization heating device 10, which utilizes heat recovery water, which is the exhaust hot water from the auxiliary cooler 6, is further utilized in the exhaust heat utilization cooling device 20, and the cooling water of the exhaust heat utilization cooling device 20 is heated by utilizing part of the exhaust heat from the heater 2 to preheat the heat treatment object W, thereby making it possible to effectively utilize the exhaust heat to a lower temperature side.

[0040] Note that the configurations illustrated in the above embodiments and modifications are merely functional schematics and do not necessarily have to be physically configured as illustrated. In other words, the distribution and integration of each device and component is not limited to that illustrated, and all or part of them can be functionally or physically distributed and integrated in any unit depending on various usage conditions, etc. [Explanation of symbols]

[0041] 1 Preheater 2,3 Heater 4. Sterilization treatment equipment 5,7 Cooler 6 Auxiliary cooler 8 Cooling water heat exchanger 9 Preheating water heat exchanger 10. Waste heat utilization heating device 11 Compressor 12,24 Condenser 12A, 12B, 14A, 14B, 22A, 22B, 24A, 24B, 26A, 26B Connection points 13,25 Expansion valve 14,26 Evaporator 20. Waste heat cooling device 21 Refrigerant pump 22 Steam Generator 23 Ejector 30 Chilled water chiller 31 Cooling Tower 100 Boiler 101 Heat recovery heating and cooling system A10 Exhaust heat utilization heating device side A20 Bypass piping side C control section L1 Heat recovery water circulation route L2 Auxiliary cooling water circulation path L3 Preheated water circulation path L10 Heat source hot water circulation route L30 Chiller cooling water circulation path LB1 Bypass piping M1~M3 Operation Mode P1, P2, P10, P30, P31 Circulation pump P11 Pump PT1, PT2, PT4 junction PT3,PT5 branch point S Temperature Sensor T1 Heat recovery water temperature V1 Switching valve W Heat treatment target

Claims

1. A heat recovery heating and cooling system in which a heat treatment object is heated stepwise through a series of heaters, then heat-treated, and the heat-treated object is cooled stepwise through a series of coolers, and a part of the heat of a heat source hot water that has been heat-exchanged by the coolers is returned to the heaters and circulated, a waste heat utilization heating device that recovers heat from the heat recovery water whose temperature has been increased by heat exchange in the cooler and generates steam; a waste heat recovery cooling device that recovers heat from the heat recovery water, the temperature of which has been reduced by heat exchange in the waste heat recovery heating device, and generates cooling water for cooling the cooler; A preheated water heat exchanger that exchanges heat between preheated water, which is cooling water that has been heated by heat exchange in the exhaust heat utilization cooling device, and a portion of the heat source hot water that has been heat exchanged in the heater; a preheater provided in front of the series of heaters and configured to preheat the object to be heat-treated with the preheated water heated by the preheated water heat exchanger; Equipped with The heat recovery water flows through a heat recovery water circulation path that circulates through the cooler, the exhaust heat utilization heating device, and the exhaust heat utilization cooling device in this order and returns to the cooler, A heat recovery heating and cooling system, characterized in that the preheated water flows through a preheated water circulation path that circulates the preheated water through the exhaust heat utilization cooling device, the preheated water heat exchanger, and the preheater in that order, and returns the preheated water to the exhaust heat utilization cooling device.

2. 2. The heat recovery heating and cooling system according to claim 1, wherein a part of the heat source hot water whose temperature has been reduced by heat exchange in the preheated water heat exchanger is supplied as water to be heated by the exhaust heat recovery heating device.

3. The rear stage cooler among the coolers is cooled by chiller cooling water generated and circulated by a chiller, a cooling water heat exchanger that exchanges heat between the chiller cooling water that is heat exchanged by the downstream cooler and returned to the chiller and auxiliary cooling water that is cooling water output from the exhaust heat utilization cooling device; The heat recovery heating and cooling system according to claim 1, characterized in that the auxiliary cooling water flows through an auxiliary cooling water circulation path that circulates between the exhaust heat utilization cooling device and the cooling water heat exchanger, and cools the chiller cooling water that returns to the cold water chiller.

4. The heater is supplied with steam from a steam generating device via a steam pipe, The exhaust heat utilization heating device is a heat pump type steam generating device, and the generated steam is merged into the steam pipe and supplied to the heater, 2. The heat recovery heating and cooling system according to claim 1, wherein the exhaust heat recovery cooling device is an ejector cooling device.

5. a temperature sensor provided on an outlet side of a heat recovery water circulation path of the cooler and configured to measure a temperature of the heat recovery water; a bypass pipe that connects a branch point of the heat recovery water circulation path between the cooler and the exhaust heat recovery heating device and a joining point of the heat recovery water circulation path between the exhaust heat recovery heating device and the exhaust heat recovery cooling device, and bypasses the exhaust heat recovery heating device; a switching valve provided at the branch point for switching the supply of the heat recovery water between the exhaust heat utilization heating device side and the bypass piping side; a circulation pump provided in a heat recovery water circulation path between the exhaust heat utilization cooling device and the cooler, for circulating the heat recovery water; a control unit that performs control such that, based on a heat recovery water temperature measured by the temperature sensor, when the heat recovery water temperature is less than a first temperature and equal to or greater than a second temperature, the changeover valve is switched to the exhaust heat heating device side to operate the circulation pump, the exhaust heat heating device, and the exhaust heat cooling device, when the heat recovery water temperature is less than the second temperature and equal to or greater than a third temperature, the changeover valve is switched to the bypass piping side to stop the exhaust heat heating device and operate the circulation pump and the exhaust heat cooling device, and when the heat recovery water temperature is less than the third temperature, the changeover valve is switched to the bypass piping side to stop the circulation pump, the exhaust heat heating device, and the exhaust heat cooling device; 5. The heat recovery heating and cooling system according to claim 1, further comprising:

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