A circulating water waste heat recovery and reuse system and control method

Abstract

The present invention relates to the technical field of waste heat recovery, and in particular to a circulating water waste heat recovery and reuse system and a control method, wherein a cold water utilization unit is connected to the heating side of a heat pump unit, and a hot water utilization unit is connected to the heat release side of the heat pump unit. The cooling water heated by the heat pump unit is pumped to the cold water utilization equipment through a cold water circulation pump, and the cold water absorbs heat energy and becomes hot water, which enters the circulating water waste heat insulation tank for storage, and then flows into the heat pump unit for heating and then flows back to the cold water circulation pump for the next circulation; the hot water heated by the heat pump unit is pumped to the hot water utilization equipment through a hot water circulation pump, cooled after heating, and enters the circulating water cooling tank, and then pumped to the heat pump unit by the heat engine circulating water pump to continue heating, and the cycle repeats; the present invention can collect the waste heat of circulating cooling water of a wheel hub production line, and apply the energy to the cleaning process after wheel hub machining and hot water utilization equipment such as heat for auxiliary facilities, so as to achieve the purpose of energy recovery and reuse, cost reduction and efficiency improvement.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and in particular to a circulating water waste heat recovery and reuse system and a control method. Background Art

[0002] In recent years, energy conservation and environmental protection have become the general trend, and energy conservation, emission reduction and circular economy have become the inevitable choice for the development of many enterprises. In this context, waste heat recovery and reuse technology has gradually emerged. Combining production processes and production characteristics, a series of technical means are used to recover and reuse waste heat generated during factory production, broadening energy utilization channels and reducing the energy consumption costs of enterprises, thereby improving their competitiveness and promoting sustainable development.

[0003] Heat treatment waste heat recovery technology has been widely used in the field of industrial waste heat recovery. The present invention is aimed at the automobile wheel hub manufacturing process and designs a waste heat recovery and reuse system based on factory equipment cooling circulating water. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a circulating water waste heat recovery and reuse system and control method, which can collect a large amount of waste heat generated by the equipment cooling water in the hub manufacturing process, and transmit the collected medium and low-quality heat energy to the hub machining cleaning process and auxiliary facilities and other hot water utilization equipment, so as to achieve the purpose of energy reuse, cost reduction and efficiency improvement. .

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] A circulating water waste heat recovery and reuse system comprises a heat pump unit, a cold water utilization unit and a hot water utilization unit. The cold water utilization unit is connected to the heating side of the heat pump unit, and the hot water utilization unit is connected to the heat release side of the heat pump unit. The cold water utilization unit comprises a cold water circulation pump, cold water utilization equipment, a circulating water waste heat insulation water tank and a heat engine circulating water pump. The cooling water after the heat pump unit extracts heat is pumped to the cold water utilization equipment through the cold water circulation pump. The cold water absorbs the heat energy generated by the cold water utilization equipment and becomes hot water to enter the circulating water. The waste heat is stored in the insulation water tank and then flows into the heat pump unit through the heat engine circulating water pump. After the heat pump unit extracts the heat of the cooling water, the cooling water flows back to the cold water circulating pump for the next circulation; the hot water utilization unit includes a hot water circulation pump, hot water utilization equipment, a circulating water cooling water tank and a heat engine circulating water pump. The hot water heated by the heat pump unit is pumped to the hot water utilization equipment through the hot water circulation pump. After the hot water utilization equipment uses the heat, the hot water is cooled and enters the circulating water cooling water tank, and then is pumped to the heat pump unit by the heat engine circulating water pump to continue heating, and the cycle repeats.

[0007] In a possible technical solution, the cold water utilization device and the hot water utilization device control the water flow through solenoid valves respectively.

[0008] A possible technical solution also includes a circulating water waste heat recovery control system, which can control the operation of the heat pump unit, the cold water utilization unit and the hot water utilization unit.

[0009] In a possible technical solution, liquid level sensors are provided in the circulating water waste heat insulation water tank and the circulating water cooling water tank. The liquid level sensors transmit the liquid level signal to the circulating water waste heat recovery control system in real time. The circulating water waste heat recovery control system controls the make-up water pump to make water available to the circulating water waste heat insulation water tank and the circulating water cooling water tank respectively.

[0010] In a possible technical solution, the water supply pipelines through which the water supply pump supplies water to the circulating water waste heat insulation water tank and the circulating water cooling water tank are controlled by solenoid valves.

[0011] In a possible technical solution, a temperature sensor is installed in the circulating water waste heat insulation water tank.

[0012] A method for controlling the recovery and reuse of waste heat from circulating water is implemented according to the waste heat recovery and reuse system for circulating water described in any one of the above items. The waste heat recovery control system for circulating water communicates with the comprehensive energy utilization platform of the factory. The comprehensive energy utilization platform receives the start and stop signals of the cold water utilization equipment and the hot water utilization equipment. When a device stops running, the comprehensive energy utilization platform will send the corresponding device signal to the circulating water waste heat recovery control system. The circulating water waste heat recovery control system controls the corresponding pumps and valves to close and no longer provides circulating cold water or hot water. At the same time, the circulating water waste heat recovery control system collects the heating parameters of the heat pump unit in real time, and transmits the heating parameters to the comprehensive energy utilization platform in real time, providing a basis for the energy management of the entire factory.

[0013] In the above technical solution, the liquid level sensor transmits the liquid level signal to the circulating water waste heat recovery control system in real time, and the circulating water waste heat recovery control system controls the make-up water pump to replenish water to the circulating water waste heat insulation water tank and the circulating water cooling water tank respectively.

[0014] In the above technical solution, the temperature sensor monitors the temperature in the circulating water waste heat insulation water tank in real time. When the water temperature in the circulating water waste heat insulation water tank is lower than 20°C and lasts for more than 30 minutes, the circulating water waste heat recovery control system controls the heat pump unit to shut down. When the water temperature in the circulating water waste heat insulation water tank rises, the heat pump unit is restarted.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: cooling water is pumped to the cold water utilization equipment through the cold water circulation pump, the cold water absorbs the heat energy generated by the cold water utilization equipment, becomes hot water and enters the circulating water waste heat insulation tank for storage, and then flows into the heat pump unit through the heat engine circulation water pump. After the heat pump unit extracts the heat of the cooling water, the cooling water flows back to the cold water circulation pump for the next circulation; the hot water heated by the heat pump unit is pumped to the hot water utilization equipment through the hot water circulation pump, after the hot water utilization equipment uses the heat, the hot water is cooled, enters the circulating water cooling tank, and then is pumped to the heat pump unit by the heat engine circulation water pump to continue heating, and the cycle repeats; the waste heat of the circulating cooling water of the wheel hub production line can be collected, and the energy can be applied to the cleaning process after the wheel hub machine processing and hot water utilization equipment such as the heat used by auxiliary facilities, so as to achieve the purpose of energy recovery and reuse, cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the circulating water waste heat recovery and reuse system of the present invention;

[0017] Figure 2 It is a control flow chart of the circulating water waste heat recovery and reuse system of the present invention;

[0018] Figure 3 It is a logic control diagram of the circulating water waste heat recovery and reuse system of the present invention;

[0019] In the figure: 1-solenoid valve A, 2-air compressor, 3-die casting machine, 4-solenoid valve D, 5-cold water circulation pump A, 6-cold water circulation pump B, 7-solenoid valve F, 8-heat pump unit, 9-hot water circulation pump, 10-solenoid valve J, 11-solenoid valve I, 12-cooling tower, 13-machine cleaning, 14-auxiliary facilities, 15-solenoid valve H, 16-circulating water cooling water tank, 17-heat engine circulating water pump B, 18-solenoid valve G, 19-water supply pump, 20-solenoid valve E, 21-heat engine circulating water pump A, 22-circulating water waste heat insulation water tank, 23-refrigeration air conditioning, 24-hydraulic station, 25-solenoid valve B, 26-solenoid valve C. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] like Figure 1As shown, the circulating water waste heat recovery and reuse system of the embodiment of the present invention includes a heat pump unit 8, a cold water utilization unit and a hot water utilization unit. The cold water utilization unit is connected to the heating side of the heat pump unit 8, and the hot water utilization unit is connected to the heat release side of the heat pump unit 8. The cold water utilization unit includes a cold water circulation pump A5, a cold water circulation pump B6, cold water utilization equipment, a circulating water waste heat insulation water tank 22 and a heat engine circulation water pump A21. The cold water utilization equipment includes an air compressor 2, a die-casting machine 3, a hydraulic station 4 and a refrigeration air conditioner 23. The cooling water after the heat is extracted by the heat pump unit 8 is pumped to the air compressor 2, the die-casting machine 3 and the hydraulic station 24 through the cold water circulation pump A5. The cold water circulation pump B6 pumps the cooling water after the heat is raised by the heat pump unit 8 to the refrigeration air conditioner 23. After the cold water passes through the air compressor 2, the die-casting machine 3, the hydraulic station 24 and the refrigeration air conditioner 23, the temperature rises and becomes hot water The waste heat enters the circulating water insulation tank 22 for storage, and then flows into the heat pump unit 8 through the heat engine circulating water pump A21 for heating. After the heat pump unit 8 extracts the heat of the cooling water, the cooling water flows back to the cold water circulation pump A5 and the cold water circulation pump B6 for the next circulation; the hot water utilization unit includes a hot water circulation pump 9, hot water utilization equipment, a circulating water cooling water tank 16 and a heat engine circulating water pump B17. The hot water utilization equipment includes a machine cleaning equipment 13 and auxiliary facilities 14. The hot water heated by the heat pump unit 8 is pumped to the machine cleaning equipment 13 and the auxiliary facilities 14 by the hot water circulation pump 9. After the hot water passes through the machine cleaning equipment 13 and the auxiliary facilities 14, the hot water is cooled and enters the circulating water cooling water tank 16. It is then pumped to the heat pump unit 8 by the heat engine circulating water pump B17 to continue heating. After the temperature rises, it enters the corresponding equipment by the hot water circulation pump 9, and the cycle repeats.

[0022] As a specific embodiment of the present invention, solenoid valve A1, solenoid valve B25, solenoid valve C26, and solenoid valve D4 are respectively installed at the cooling water inlets of the air compressor 2, the die-casting machine 3, the hydraulic station 4, and the refrigeration air conditioner 23, and solenoid valve H15, solenoid valve I11, and solenoid valve J10 are respectively installed at the hot water inlets of the machine cleaning equipment 13 and the auxiliary facilities 14, to control the water flow of the corresponding equipment respectively.

[0023] In the present invention, it should be understood that the cold water utilization equipment and the hot water utilization equipment can also be any cold water utilization equipment or hot water utilization equipment other than the equipment listed in the above embodiments. The type or quantity of the cold water utilization equipment or the hot water utilization equipment can be selected according to actual use. Accordingly, the number and connection positions of the cold water circulation pumps or the hot water circulation pumps are specifically set according to the type or quantity of the cold water utilization equipment or the hot water utilization equipment; the number and connection positions of the solenoid valves are specifically set according to the type or quantity of the cold water utilization equipment or the hot water utilization equipment.

[0024] As a specific embodiment of the present invention, Figure 2As shown, it also includes a circulating water waste heat recovery control system, which controls the operation of the heat pump unit 8, all solenoid valves in the cold water utilization unit, the cold water circulation pump, the circulating water waste heat insulation water tank 22 and the heat engine circulating water pump A21, as well as all solenoid valves in the hot water utilization unit, the hot water circulation pump 9, the circulating water cooling water tank 16 and the heat engine circulating water pump B17.

[0025] As a specific embodiment of the present invention, liquid level sensors are arranged in the circulating water waste heat insulation water tank 22 and the circulating water cooling water tank 16. The circulating water waste heat recovery control system controls the circulating water waste heat insulation water tank 22 and the circulating water cooling water tank 16 respectively through the liquid level sensors. The liquid level sensor monitors the liquid level of the water tank in real time and transmits the liquid level signal to the circulating water waste heat recovery control system in real time. The circulating water waste heat recovery control system controls the make-up water pump 19 to make water available to the circulating water waste heat insulation water tank 22 and the circulating water cooling water tank 16 respectively.

[0026] As a specific implementation of the present invention, the water supply pipelines for the water supply pump 19 to supply water to the circulating water waste heat insulation water tank 22 and the circulating water cooling water tank 16 are respectively controlled by the solenoid valve E20 and the solenoid valve G18.

[0027] As a specific embodiment of the present invention, a temperature sensor is installed in the circulating water waste heat insulation water tank 22. The temperature sensor monitors the temperature in the water tank in real time and transmits the temperature signal to the circulating water waste heat recovery control system in real time.

[0028] A circulating water waste heat recovery and reuse control method of the present invention is as follows: Figure 2 As shown, the circulating water waste heat recovery control system communicates with the factory's comprehensive energy utilization platform. As the circulating water waste heat control sub-stack of the entire factory's energy comprehensive utilization platform, the energy comprehensive utilization platform receives the start and stop signals of the cold water utilization equipment and the hot water utilization equipment. When a device stops running, the energy comprehensive utilization platform will send the corresponding device signal to the circulating water waste heat recovery control system. The circulating water waste heat recovery control system controls the corresponding pumps and valves to close, and no longer provides circulating cold water or hot water; at the same time, the circulating water waste heat recovery control system collects the heating parameters of the heat pump unit in real time, and transmits the heating parameters such as the heating amount and heating efficiency to the energy comprehensive utilization platform in real time, providing a basis for the energy management of the entire factory.

[0029] As a specific embodiment of the present invention, Figure 3 As shown, the liquid level sensor transmits the liquid level signal to the circulating water waste heat recovery control system in real time. When the liquid level decreases, the circulating water waste heat recovery control system controls the water replenishment pump 19 and the solenoid valve E20 or the solenoid valve G18 to open to replenish water for the water tank.

[0030] As a specific embodiment of the present invention, the temperature sensor in the circulating water waste heat insulation water tank 22 monitors the temperature in the circulating water waste heat insulation water tank 22 in real time. When the water temperature in the circulating water waste heat insulation water tank 22 is lower than 20°C and the duration is greater than 30 minutes, it means that the upstream heating equipment has been partially shut down and the heat storage capacity of the circulating water waste heat insulation water tank 22 is insufficient. In order to save energy, the circulating water waste heat recovery control system controls the heat pump unit 8 to shut down. When the water temperature in the circulating water waste heat insulation water tank 22 rises to higher than 20°C, the heat pump unit 8 is restarted.

[0031] As a specific embodiment of the present invention, the hot water utilization unit also includes a cooling tower 12, and the solenoid valve J10 is installed at the hot water inlet of the cooling tower 12. The circulating water waste heat recovery control system collects the heating parameters of the heat pump unit in real time. When the heating amount is roughly equivalent to the heat required by the auxiliary facilities 14 and the machine cleaning equipment 13, normal heating is performed. If the heating amount is greater than the heat required by the two types of equipment, the circulating water waste heat recovery control system controls the cooling tower 12 to start dissipating heat. If the heating amount is far less than the heat required by the two types of equipment, other heating systems are turned on for heating (not shown in the figure), and then the circulating water waste heat recovery control system repeats the above logic control.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A circulating water waste heat recovery and reuse system, characterized in that: Used in wheel hub manufacturing process, including heat pump unit, cold water utilization unit and hot water utilization unit, the cold water utilization unit is connected to the heating side of the heat pump unit, the hot water utilization unit is connected to the heat release side of the heat pump unit, the cold water utilization unit includes cold water circulation pump, cold water utilization equipment, circulating water waste heat insulation water tank and heat engine circulating water pump, the cooling water after the heat pump unit extracts heat is pumped to the cold water utilization equipment through the cold water circulation pump, the cold water absorbs the heat energy generated by the cold water utilization equipment, turns into hot water and enters the circulating water waste heat insulation water tank The hot water is stored in the warm water tank and then flows into the heat pump unit through the heat engine circulating water pump. After the heat pump unit extracts the heat of the cooling water, the cooling water flows back to the cold water circulating pump for the next circulation. The hot water utilization unit includes a hot water circulating pump, a hot water utilization device, a circulating water cooling water tank and a heat engine circulating water pump. The hot water heated by the heat pump unit is pumped to the hot water utilization device through the hot water circulating pump. After the hot water utilization device uses the heat, the hot water is cooled and enters the circulating water cooling water tank. Then, it is pumped to the heat pump unit by the heat engine circulating water pump to continue heating, and the cycle repeats. The cold water utilization equipment includes air compressors, die-casting machines, hydraulic stations and refrigeration air conditioners, and the hot water utilization equipment includes machine cleaning equipment and auxiliary facilities; The cold water utilization equipment and the hot water utilization equipment respectively control the water flow through the solenoid valve; It also includes a circulating water waste heat recovery control system, which can control the operation of the heat pump unit, the cold water utilization unit and the hot water utilization unit; Liquid level sensors are provided in the circulating water waste heat insulation water tank and the circulating water cooling water tank. The liquid level sensors transmit liquid level signals to the circulating water waste heat recovery control system in real time. The circulating water waste heat recovery control system controls the water replenishment pump to replenish water to the circulating water waste heat insulation water tank and the circulating water cooling water tank respectively. The water supply pipelines through which the water supply pump supplies water to the circulating water waste heat insulation water tank and the circulating water cooling water tank are controlled by solenoid valves; A temperature sensor is installed in the circulating water waste heat insulation water tank; The control method of the circulating water waste heat recovery and reuse system is as follows: the circulating water waste heat recovery control system communicates with the factory's energy comprehensive utilization platform, the energy comprehensive utilization platform receives the start and stop signals of the cold water utilization equipment and the hot water utilization equipment, when a device stops running, the energy comprehensive utilization platform will send the corresponding device signal to the circulating water waste heat recovery control system, the circulating water waste heat recovery control system controls the corresponding pump and valve to close, and no longer provides circulating cold water or hot water; at the same time, the circulating water waste heat recovery control system collects the heating parameters of the heat pump unit in real time, and transmits the heating parameters to the energy comprehensive utilization platform in real time, providing a basis for the energy management of the entire factory; The temperature sensor monitors the temperature in the circulating water waste heat insulation water tank in real time. When the water temperature in the circulating water waste heat insulation water tank is lower than 20℃ and lasts for more than 30 minutes, the circulating water waste heat recovery control system controls the heat pump unit to shut down. When the water temperature in the circulating water waste heat insulation water tank rises, the heat pump unit is restarted.

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