An electronic factory balanced waste heat recovery system

Abstract

An electronic factory balanced waste heat recovery system, the system is divided into five parts of refrigeration machine, primary medium temperature heat pump, secondary high temperature heat pump, pure water production preheating, temperature control water tank, through recycling all waste heat, cancel the application of cooling tower, through the filtered water temperature rise and provide low temperature heat for the primary medium temperature heat pump, complete the whole recovery of waste heat, gradually reduce the cooling water temperature, meet the water temperature requirement of refrigeration machine refrigeration demand, the cooling water also as the water supplement of medium and high temperature system, through the application of temperature control water tank, improve the water temperature while the water is insulated, avoid the fluctuation of system water supply to the system operation.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste heat recovery and relates to a waste heat recovery system where the amount of waste heat used does not match the flow rate. Background Technology

[0002] Some large electronics factories use a lot of heat and have many temperature requirements. Due to the requirements of the production process, they need almost all types of heat, from high temperature to medium temperature to low temperature. However, energy will be converted from high temperature to low temperature. Usually, the heat used in electronics factories will be exchanged at high temperature to replace high-grade heat with low-grade heat. Even if waste heat recovery is used, it will only directly raise the temperature to the temperature required by a certain production process. This kind of secondary utilization through waste heat recovery technology is a common method. Electronic equipment production is quite sensitive to temperature requirements, so waste heat recovery needs to be more stable. Waste heat recovery should be combined with the process to reduce the fluctuations in the circulation system during waste heat recovery. At the same time, it should also produce water temperatures required by different production processes to reduce production costs and carbon emissions.

[0003] This invention designs a balanced waste heat recovery system for an electronics factory, in which the industrial waste heat generated during the production process is equal to the waste heat recovered and used, and stable medium and high temperatures are matched according to the production process. Summary of the Invention

[0004] Addressing the challenges of large amounts of unutilized industrial waste heat in electronics factories, coupled with the diverse range of high- and medium-temperature applications, this invention employs a balanced waste heat recovery system. The system comprises five parts: a chiller, a primary medium-temperature heat pump, a secondary high-temperature heat pump, a pure water preheating system, and a temperature-controlled water supply tank. By recovering all waste heat, the use of a cooling tower is eliminated. The system achieves complete waste heat recovery by heating the filtered water and providing low-temperature heat to the primary medium-temperature heat pump, gradually reducing the cooling water temperature to meet the refrigeration requirements of the chiller. The cooling water also serves as makeup water for the medium- and high-temperature systems. The temperature-controlled water supply tank enhances the makeup water temperature while simultaneously maintaining its insulation, preventing fluctuations in system operation caused by makeup water supply.

[0005] This invention is implemented as follows: An electronic factory waste heat recovery system includes a chiller cooling water pipeline with two sets of branch pipes. One set is connected to a filtered water heating heat exchanger, and the other set is connected to a primary medium-temperature heat pump. The primary medium-temperature heat pump is connected to a secondary high-temperature heat pump through a pipeline. A branch pipe is installed between the primary medium-temperature heat pump and the secondary high-temperature heat pump to install a temperature-controlled water supply tank. A temperature-controlled water supply tank is installed at the rear end of the secondary high-temperature heat pump. The chiller cooling water serves as a heat source, supplying water to the evaporator and filtered water heating heat exchanger of the primary medium-temperature heat pump. The cooled circulating water returns to the chiller. The cooling water outlet temperature is 35-38℃, and the return water temperature is 30-33℃, with a temperature difference of 5℃.

[0006] The temperature-controlled water supply tank has an insulation layer on the outside and a water-dividing baffle in the middle of the tank, dividing the interior into upper and lower layers. The baffle has three round holes and a crescent-shaped opening. The heat exchange spiral coil passes through the baffle. The inlet pipe of the heat exchange spiral coil protrudes from the lower side of the tank, and the outlet pipe protrudes from the upper side of the tank. The top of the tank is equipped with a water level sensor, an air vent valve, a sealed inspection cover, and an air check valve. An air filter is installed after the air check valve. The lower layer of the temperature-controlled water supply tank has a temperature sensor that controls the opening and closing of the high-temperature water supply valve group. The water level sensor at the top of the tank controls the opening and closing of the water supply valve. The water supply pipe of the temperature-controlled water supply tank is located in the upper layer of the tank, and the system water supply outlet pipe is located in the lower layer of the tank. The water supply pump returns the medium and high temperature system water to the rear of the water return pump.

[0007] The beneficial effects of this invention are:

[0008] 1. Completely eliminate cooling towers to reduce electricity and water consumption.

[0009] 2. Low-temperature waste heat is uniformly recovered according to the required temperature. Based on different temperature usages, the required high temperature is reduced, thus minimizing the waste of high-temperature heat sources.

[0010] 3. Temperature-controlled water supply tank: It has its own water tank function. After gradually warming up the system with a small amount of medium and high temperature water, there is no need to set up additional heating equipment or use a heat exchanger. It can be used for direct water supply, avoiding large fluctuations in the system caused by adding low temperature water. Attached Figure Description

[0011] Figure 1 The system of the present invention Figure 1 .

[0012] Figure 2 The structure of the temperature-controlled water supply tank of this invention Figure 2 .

[0013] As shown in the diagram: 1. Refrigeration unit; 2. Primary medium-temperature heat pump; 3. Secondary high-temperature heat pump; 4. Temperature-controlled water supply tank; 4-1. Insulation layer; 4-2. Heat exchange spiral coil; 4-3. Water distribution baffle; 4-4. Temperature sensor; 4-5. Water level sensor; 4-6. Air vent valve; 4-7. Air check valve; 4-8. Air filter; 4-9. Sealed inspection cover; 4-10. System water supply outlet pipe; 4-11. Inverted U-shaped pipe; 5. Filtered water heating heat exchanger. 6-1. Circulation pump 1, 6-2. Circulation pump 2, 6-3. Circulation pump 3, 6-4. Circulation pump 4, 6-5. Circulation pump 5, 7-1. Valve assembly 1, 7-2. Valve assembly 2, 7-3. Valve assembly 3, 7-4. Valve assembly 4, 7-5. Valve assembly 5, 7-6. Valve assembly 6, 7-7. Valve assembly 7, 8-1. Water supply valve 1, 8-2. Water supply valve 2, 8-3. Check valve 1, 8-4. Check valve 2, 9-1. Medium temperature water valve assembly, 9-2. High temperature water valve assembly. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] When the refrigeration unit (1) is running, valve group 1 (7-1) is opened and circulation pump 1 (6-1) is started at the same time. Cooling water of 35-38℃ for circulating the refrigeration unit (1) is delivered to the filter water heating heat exchanger (5) and the first-stage medium temperature heat pump (2) for cooling, reducing the temperature to 30-33℃, and then delivered back to the refrigeration unit (1).

[0016] When a medium-temperature heat source of 65-70℃ hot water is needed, open valve group 3 (7-3) and valve group 4 (7-4) to start the evaporator of the first-stage medium-temperature heat pump (2) to absorb the cooling water of the refrigeration unit (1), so that the cooling water of 35-38℃ is reduced to 30-33℃ and sent back to the refrigeration unit (1) for refrigeration, so that the outlet water temperature of the condenser of the first-stage medium-temperature heat pump (2) reaches 65-70℃.

[0017] When medium-temperature water needs to be replenished, the water replenishment valve 1 (8-1) is opened to allow the cooling water of the chiller (1) to enter the medium-temperature side temperature-controlled water replenishment tank (4). The replenishment water is added to the medium-temperature circulating water return water through the circulation pump 4 (6-4). The check valve 1 (8-3) is used to prevent the medium-temperature water from flowing back to the medium-temperature side temperature-controlled water replenishment tank (4). The circulation pump 2 (6-2) is used for medium-temperature water circulation and to supply heating circulating water to the medium-temperature side temperature-controlled water replenishment tank (4). The valve group 5 (7-5) is used to control the amount of medium-temperature water used in circulation.

[0018] When a high-temperature heat source of 95-100℃ hot water is needed, open valve group 6 (7-6) and valve group 7 (7-7) to start the secondary high-temperature heat pump (3) evaporator to absorb the medium-temperature water from the primary medium-temperature heat pump (2), so that the cooling water of 65-70℃ is reduced to 60-65℃ and sent back to the primary medium-temperature heat pump (2) for reheating, so that the outlet water temperature of the secondary high-temperature heat pump (3) condenser reaches 95-100℃.

[0019] When high-temperature water needs to be replenished, the water replenishment valve 2 (8-2) is opened, allowing the medium-temperature water from the first-stage medium-temperature heat pump (2) to enter the high-temperature side temperature-controlled water replenishment tank (4). The replenishment water is added to the high-temperature circulating water return water through the circulation pump 5 (6-5). The check valve 2 (8-4) is used to prevent high-temperature water from flowing back to the high-temperature side temperature-controlled water replenishment tank (4). The circulation pump 3 (6-3) is used for medium-temperature water circulation and to provide heating circulating water to the high-temperature side temperature-controlled water replenishment tank (4).

[0020] The temperature-controlled water supply tank (4) has an insulation layer (4-1) on its outside. Inside the tank, there is a water-dividing baffle (4-3) that divides the tank into upper and lower layers. The water-dividing baffle (4-3) has three round holes and one crescent-shaped hole. One of the holes is used to lower the water level sensor (4-5) into the tank. The crescent-shaped hole is used to install the heat exchange spiral coil (4-2). The other two holes are used for the upper layer of water to flow downwards when the tank is replenished. The water level sensor (4-5) is installed from the top of the tank.

[0021] The top of the temperature-controlled water supply tank (4) also includes an inverted U-shaped pipe (4-11), an exhaust valve (4-6), a sealing inspection cover (4-9), and four main pipes on the outside of the tank body. Two of them are the inlet and outlet pipes of the heat exchange spiral coil (4-2), and the other two are the water supply pipes of the temperature-controlled water supply tank (4) on the upper layer and the water supply outlet pipe of the system on the lower layer (4-10). The water level sensor (4-5) controls the water supply valve 1 (8-1) to supply water into the tank. A temperature sensor (4-4) is installed on the outside of the lower layer of the tank body to detect the water temperature of the lower layer. When the water temperature of the lower layer of the tank body is lower than the set water temperature, the medium temperature water valve group (9-1) or the high temperature water valve group (9-2) is opened to heat the water temperature in the tank. The inverted U-shaped pipe (4-11) is installed on the top of the temperature-controlled water supply tank (4), and an air check valve (4-7) is installed on the other side of the pipe. An air filter (4-8) is installed at the rear end of the air check valve (4-7).

[0022] This invention is not limited to this embodiment. Any equivalent concept or modification within the technical scope disclosed in this invention shall be included within the protection scope of this invention.

Claims

1. A waste heat recovery system for an electronics factory, characterized in that: The system includes a chiller (1) with two sets of branch pipes for the cooling water pipeline. One set is connected to the filter water heating heat exchanger (5), and the other set is connected to the first-stage medium-temperature heat pump (2). The first-stage medium-temperature heat pump (2) is connected to the second-stage high-temperature heat pump (3) through a pipeline. A branch pipe is installed between the first-stage medium-temperature heat pump (2) and the second-stage high-temperature heat pump (3) to install a temperature-controlled water supply tank (4). The temperature-controlled water supply tank (4) is installed at the rear end of the second-stage high-temperature heat pump (3). The cooling water of the chiller (1) serves as a heat source to supply water to the evaporator of the first-stage medium-temperature heat pump (2) and the filter water heating heat exchanger (5). The cooled circulating water returns to the chiller (1). The outlet temperature of the cooling water is 35-38℃, the return temperature is 30-33℃, and the temperature difference is 5℃.

2. The waste heat recovery system for an electronics factory according to claim 1, characterized in that: The temperature-controlled water supply tank (4) has an insulation layer (4-1) on its exterior and a water distribution baffle (4-3) in the middle of its interior, dividing the interior of the temperature-controlled water supply tank (4) into upper and lower layers. The water distribution baffle (4-3) has three round holes and a crescent-shaped opening. The heat exchange spiral coil (4-2) passes through the water distribution baffle (4-3). The inlet pipe of the heat exchange spiral coil (4-2) protrudes from the lower side of the tank and the outlet pipe of the heat exchange spiral coil (4-2) protrudes from the upper side of the tank. A water level sensor (4-1) is installed on the top of the tank. -5), exhaust valve (4-6), sealing inspection cover (4-9), air check valve (4-7), air filter (4-8) installed after air check valve (4-7), temperature sensor (4-4) is installed on the lower layer of temperature-controlled water supply tank (4) to control the switch of high temperature water supply valve group (9-1), water level sensor (4-5) at the top of tank controls the switch of water supply valve (8-1), water supply pipe of temperature-controlled water supply tank (4) is set on the upper layer of tank, and system water supply outlet pipe (4-10) is set on the lower layer of tank.

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