Waste heat recovery system

Abstract

The utility model discloses a waste heat recovery system which comprises a first pipeline, a waste heat recovery device and an evaporative cooling tower, the first pipeline comprises an input end and an output end, and the first pipeline is configured to receive high-temperature cooling water after cooling production equipment from the input end and output low-temperature cooling water for cooling the production equipment from the output end; the waste heat recovery device is arranged on the first pipeline and is configured to recover heat of the high-temperature cooling water to form medium-temperature cooling water; the evaporative cooling tower is arranged on the first pipeline and is configured to cool the medium-temperature cooling water so as to provide output low-temperature cooling water to the output end. According to the waste heat recovery system, the waste heat recovery device and the evaporative cooling tower are arranged, high-temperature cooling water is rapidly cooled to low-temperature cooling water, compared with natural cooling through a cold water pool, the waste heat recovery system improves the cooling efficiency and facilitates reduction of the production cost, in addition, part of heat is recovered by the waste heat recovery device in the process, and the energy consumption is reduced. And a large amount of loss of heat is effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of cooling water systems, and more specifically, to a waste heat recovery system. Background Art

[0002] The production equipment in a spandex chemical fiber plant generates a large amount of heat when working and uses water cooling to dissipate the heat. The low-temperature cooling water flows from the cooling tower through the production equipment and becomes high-temperature cooling water. The high-temperature cooling water is usually cooled naturally in a cooling water pool and replenished to the cooling tower. However, due to the low efficiency of natural cooling in the cooling water pool, it is necessary to build a large cooling water pool to meet the low-temperature cooling water standard, which is costly. Otherwise, the high-temperature cooling water can only be discharged as sewage, resulting in heat loss. Utility Model Content

[0003] An embodiment of the present application provides a waste heat recovery system.

[0004] The waste heat recovery system of the embodiment of the present application includes:

[0005] a first pipeline, the first pipeline comprising an input end and an output end, the first pipeline being configured to receive high-temperature cooling water after cooling the production equipment from the input end and output low-temperature cooling water for cooling the production equipment from the output end;

[0006] a waste heat recovery device, the waste heat recovery device being disposed in the first pipeline and configured to recover heat from the high-temperature cooling water to form medium-temperature cooling water;

[0007] An evaporative cooling tower is provided in the first pipeline and is configured to cool the medium-temperature cooling water to provide output low-temperature cooling water to the output end.

[0008] The waste heat recovery system provided in the present application quickly cools high-temperature cooling water to low-temperature cooling water by setting up a waste heat recovery device and an evaporative cooling tower. Compared with natural cooling using a cold water pool, the waste heat recovery system improves the cooling efficiency and helps reduce production costs. In addition, in the process of cooling the high-temperature cooling water to low-temperature cooling water, part of the heat is recovered by the waste heat recovery device, effectively avoiding a large amount of heat loss.

[0009] In certain embodiments, the waste heat recovery system further includes a hot water pump assembly, which is disposed in the first pipeline and configured to transport the high-temperature cooling water from the input end to the waste heat recovery device.

[0010] In this way, the hot water pump assembly is used to power the high-temperature cooling water so that it can flow quickly to the waste heat recovery device, thereby improving the cooling efficiency.

[0011] In some embodiments, there are two groups of hot water pump assemblies, and the two groups of hot water pump assemblies are arranged in parallel in the first pipeline.

[0012] In this way, the two sets of hot water pump components form a redundant setting. If one set of hot water pump components is damaged during use, the other set of hot water pump components can be opened and used as a replacement.

[0013] In some embodiments, the waste heat recovery device includes an absorption chiller, which includes a first water inlet and a first water outlet. The high-temperature cooling water flows from the input end into the first water inlet, and the medium-temperature cooling water flows from the first water outlet to the evaporative cooling tower.

[0014] In this way, the high-temperature cooling water can be passed into the absorption chiller to cool the cooling water of other equipment.

[0015] In certain embodiments, the waste heat recovery system further includes a cold water pump assembly, and the absorption chiller further includes a second water outlet, and the second water outlet is connected to the cold water pump assembly via a second pipeline.

[0016] In this way, the cold water pump assembly can provide power for the cooling water output by the absorption chiller so that the cooling water can flow back to the required equipment.

[0017] In some embodiments, the waste heat recovery device includes a heat exchanger, which includes a third water inlet and a third water outlet. The high-temperature cooling water flows from the input end into the third water inlet, and the medium-temperature cooling water flows from the third water outlet to the evaporative cooling tower.

[0018] In this way, the heat exchanger can dissipate the heat of the high-temperature cooling water to the location where the heat is needed for heating, insulation or heating.

[0019] In certain embodiments, the heat exchanger is a heating plate heat exchanger.

[0020] In this way, the heating plate heat exchanger can use the heat of high-temperature cooling water to heat factories and other places, which is conducive to reducing production costs.

[0021] In some embodiments, the waste heat recovery system further includes a bypass valve, one end of which is connected to the input end and the third water inlet end through the first pipeline, and the other end of which is connected to the third water outlet end and the evaporative cooling tower through the first pipeline.

[0022] In this way, when heating is needed, the bypass valve can be closed to allow high-temperature cooling water to flow through the heat exchanger. When heating is not needed, the bypass valve can be opened to allow high-temperature cooling water to flow directly to the next device, thereby making the heating of the heat exchanger more flexible.

[0023] In certain embodiments, the waste heat recovery system further includes a fourth remote temperature meter and an electric regulating valve, the input end is connected to the third water inlet end through the electric regulating valve, the fourth remote temperature meter is arranged between the third water outlet end and the evaporative cooling tower, the fourth remote temperature meter and the electric regulating valve are electrically connected, and the electric regulating valve is configured to adjust the opening of the electric regulating valve to control the flow rate of the third water inlet end according to the outlet water temperature of the third water outlet end obtained by the fourth remote temperature meter.

[0024] In this way, using the outlet water temperature to control the flow rate of the third water inlet end is conducive to making the heat emitted by the heat exchanger more stable and facilitating temperature control and maintenance.

[0025] In some embodiments, the waste heat recovery device includes an absorption chiller and a heat exchanger, the high-temperature cooling water flows from the input end into the heat exchanger, the medium-temperature cooling water flows from the heat exchanger to the absorption chiller, and then flows from the absorption chiller to the evaporative cooling tower.

[0026] In this way, by setting up two waste heat recovery devices at the same time, the heat in the condensed water can be recovered more fully.

[0027] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 It is a structural schematic diagram of a waste heat recovery system according to an embodiment of the present application;

[0030] Figure 2 Schematic diagram of the structure of a hot water pump assembly of a waste heat recovery system according to an embodiment of the present application;

[0031] Figure 3 is a schematic structural diagram of an absorption chiller of a waste heat recovery system according to an embodiment of the present application;

[0032] Figure 4 It is a structural schematic diagram of the heat exchanger of the waste heat recovery system of the embodiment of the present application.

[0033] Explanation of the main component symbols: waste heat recovery system 100, first pipeline 10, output end 11, output end 12, waste heat recovery device 20, absorption chiller 21, first water inlet end 211, first water outlet end 212, second water inlet end 213, second water outlet end 214, first remote pressure gauge 215, first remote temperature gauge 216, first local temperature gauge 217, second remote pressure gauge 218, second remote temperature gauge 219, second local temperature gauge 210 0, heat exchanger 22, third water inlet end 221, third water outlet end 222, electric regulating valve 223, third remote pressure gauge 224, third remote temperature gauge 225, third local temperature gauge 226, fourth remote temperature gauge 227, fourth local temperature gauge 228, evaporative cooling tower 30, second pipeline 40, hot water pump assembly 50, gate valve 51, filter 52, expansion joint 53, pump body 54, check valve 55, cold water pump assembly 60, bypass valve 70. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore are not to be construed as limiting the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise specifically defined.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0038] The production equipment in a spandex chemical fiber plant generates a large amount of heat when working and uses water cooling to dissipate the heat. The low-temperature cooling water flows from the cooling tower through the production equipment and becomes high-temperature cooling water. The high-temperature cooling water is usually cooled naturally in a cooling water pool and replenished to the cooling tower. However, due to the low efficiency of natural cooling in the cooling water pool, it is necessary to build a large cooling water pool to meet the low-temperature cooling water standard, which is costly. Otherwise, the high-temperature cooling water can only be discharged as sewage, resulting in heat loss.

[0039] See also Figure 1 The waste heat recovery system 100 of the embodiment of the present application includes a first pipeline 10, a waste heat recovery device 20 and an evaporative cooling tower 30. The first pipeline 10 includes an input end 11 and an output end 12. The first pipeline 10 is configured to receive high-temperature cooling water after cooling the production equipment from the input end 11 and output low-temperature cooling water for cooling the production equipment from the output end 12; the waste heat recovery device 20 is arranged in the first pipeline 10 and is configured to recover the heat of the high-temperature cooling water to form medium-temperature cooling water; the evaporative cooling tower 30 is arranged in the first pipeline 10 and is configured to cool the medium-temperature cooling water to provide output low-temperature cooling water to the output end 12.

[0040] The waste heat recovery system provided in the present application quickly cools high-temperature cooling water to low-temperature cooling water by setting up a waste heat recovery device 20 and an evaporative cooling tower 30. Compared with natural cooling using a cold water pool, the waste heat recovery system 100 improves the cooling efficiency, which is beneficial to reducing production costs. In addition, in the process of cooling the high-temperature cooling water to low-temperature cooling water, a portion of the heat is recovered by the waste heat recovery device 20, effectively avoiding a large amount of heat loss.

[0041] Specifically, in an embodiment of the present application, the waste heat recovery system 100 is connected to the production equipment, wherein the output end 11 can be the drainage end of the production equipment, so that the high-temperature cooling water discharged from the production equipment can directly enter the waste heat recovery system 100, and the output end 12 can be the water injection end of the production equipment, so that the low-temperature cooling water that has completed cooling can be directly injected into the production equipment for recycling.

[0042] The waste heat recovery device 20 is a device that can capture and convert the waste heat in the high-temperature cooling water for further utilization. In the embodiment of the present application, the waste heat recovery device 20 can not only recycle and utilize part of the heat of the high-temperature cooling water to avoid waste, but also play a role in initially cooling the high-temperature cooling water, thereby reducing the subsequent cooling demand of the evaporative cooling tower 30.

[0043] Evaporative cooling tower 30 cools high-temperature cooling water by bringing hot water into contact with air, utilizing the evaporation process. This cooling method is more efficient than other cooling methods or equipment, achieving a greater temperature difference and providing a better cooling effect, significantly improving cooling efficiency. Furthermore, evaporative cooling tower 30 uses less water, helping to reduce water consumption and improve water utilization efficiency.

[0044] In the embodiment of the present application, the input high-temperature cooling water is about 90 degrees Celsius, and the output low-temperature cooling water is usually at a temperature below 30 degrees Celsius.

[0045] See also Figure 1 and Figure 2 In some embodiments, the waste heat recovery system 100 further includes a hot water pump assembly 50 , which is disposed in the first pipeline 10 and configured to transport high-temperature cooling water from the input end 12 to the waste heat recovery device 20 .

[0046] In this way, the hot water pump assembly 50 is used to provide power for the high-temperature cooling water so that it can flow quickly to the waste heat recovery device 20, thereby improving the cooling efficiency.

[0047] Specifically, in this embodiment, each hot water pump assembly 50 includes a gate valve 51, a filter 52, an expansion joint 53, a pump body 54, an expansion joint 53, a check valve 55, and the gate valve 51, which are connected in sequence. The pump body 54 is the main body of the hot water pump assembly 50. The gate valves 51 at both ends control the flow of water, facilitating disassembly of the pump body 54 and other components. The filter 52 is used to filter impurities such as rust that may be present in the high-temperature cooling water, preventing damage to the pump body 54 caused by impurity accumulation. The expansion joint 53 absorbs the thermal expansion and contraction stress and other stresses caused by temperature changes in the pipe, thereby preventing pipe deformation, rupture, and other problems. Furthermore, the expansion joint 53 acts as a buffer, effectively reducing the impact of pressure changes in the pipe system, thereby protecting the pipe system from excessive pressure shocks. The check valve 55 ensures that the high-temperature cooling water flows only in a specified direction. When the pump body 54 stops operating, the check valve 55 immediately closes to prevent the high-pressure water from flowing back into the pump body 54. This can prevent the pump body 54 from reversing or even being damaged due to backflow. At the same time, the check valve 55 can also help maintain the designed working pressure of the system, ensure the normal flow of fluid in the pipeline, and protect the stability of the entire pipeline system.

[0048] In some embodiments, there are two groups of hot water pump assemblies 50 , and the two groups of hot water pump assemblies 50 are arranged in parallel in the first pipeline 10 .

[0049] In this way, the two sets of hot water pump assemblies 50 form a redundant arrangement. If one set of hot water pump assemblies 50 is damaged during use, the other set of hot water pump assemblies 50 can be opened and used as a replacement.

[0050] Specifically, two groups of hot water pump assemblies 50 are arranged in parallel. When the waste heat recovery system 100 is working, only one group of hot water pump assemblies 50 is turned on, and the other group is used as a backup. When any component of the hot water pump assembly 50 in use fails, the other group of backup hot water pump assembly 50 is turned on to avoid equipment shutdown affecting production efficiency.

[0051] In an embodiment of the present application, the two groups of hot water pump assemblies 50 are exactly the same. In other embodiments, the two groups of hot water pump assemblies 50 may not be the same. For example, in order to adapt to high-temperature cooling water in different situations, two groups of non-identical hot water pump assemblies 50 are set, and different hot water pump assemblies 50 are switched to adapt to high-temperature cooling water in different situations.

[0052] See also Figure 1 and Figure 3 In some embodiments, the waste heat recovery device 20 includes an absorption chiller 21, which includes a first water inlet end 211 and a first water outlet end 212. High-temperature cooling water flows from the output end 11 into the first water inlet end 211, and medium-temperature cooling water flows from the first water outlet end 212 to the evaporative cooling tower 30.

[0053] In this way, the high-temperature cooling water is passed into the absorption chiller 21 to cool the cooling water of other equipment.

[0054] Specifically, the absorption chiller 21 is a highly efficient, environmentally friendly, and versatile refrigeration device that utilizes a binary solution as a working fluid, with the low-boiling-point component serving as the refrigerant and the high-boiling-point component serving as the absorbent. The interaction between the absorbent and the refrigerant creates a refrigeration cycle. During the refrigeration process, the refrigerant evaporates, absorbing heat and generating a cooling effect; the absorbent then absorbs the refrigerant vapor, completing the cycle. In other words, the absorption chiller 21 absorbs heat from high-temperature cooling water to generate cooling.

[0055] In an embodiment of the present application, the absorption chiller 21 includes a first water inlet 211, a first water outlet 212, a second water inlet 213 and a second water outlet 214, wherein the first water inlet 211 is connected to the first pipeline 10 for inputting high-temperature cooling water, the first water outlet 212 is connected to the first pipeline 10 for outputting medium-temperature cooling water, and the second water inlet 213 and the second water outlet 214 are connected to the second pipeline 40 for transporting cooling water required by other equipment. Among them, the second water inlet 213 is used to input cooling water discharged from other equipment, and the second water outlet 214 is used to discharge cooled cooling water. It is easy to understand that the absorption chiller 21 absorbs the heat of the high-temperature cooling water input by the first water inlet 211 to cool the condensed water input by the second water inlet 213.

[0056] Furthermore, the first water inlet end 211 , the first water outlet end 212 , the second water inlet end 213 and the second water outlet end 214 are all connected with valves to facilitate the disassembly and assembly of the absorption chiller 21 .

[0057] Furthermore, a first remote pressure gauge 215, a first remote temperature gauge 216 and a first local temperature gauge 217 are installed on the first pipeline 10 near the first water inlet end 211, wherein the first remote pressure gauge 215 is used to monitor the water inlet pressure of the first water inlet end 211 and upload the data to the control end, the first remote temperature gauge 216 is used to monitor the water inlet temperature of the first water inlet end 211 and upload the data to the control end, and the first local temperature gauge 217 is used to monitor the water inlet temperature of the first water inlet end 211 and display it to the outside for on-site viewing.

[0058] Similarly, a second remote pressure gauge 218, a second remote temperature gauge 219 and a second on-site temperature gauge 210 are installed on the first pipeline 10 near the first water outlet end 212, wherein the second remote pressure gauge 218 is used to monitor the water outlet pressure of the first water outlet end 212 and upload the data to the control end, the second remote temperature gauge 219 is used to monitor the water outlet temperature of the first water outlet end 212 and upload the data to the control end, and the second on-site temperature gauge 210 is used to monitor the water outlet temperature of the first water outlet end 212 and display it externally for on-site viewing.

[0059] See also Figure 1 In some embodiments, the waste heat recovery system 100 further includes a cold water pump assembly 60 , and the absorption chiller 21 further includes a second water outlet 214 , which is connected to the cold water pump assembly 60 through a second pipeline 40 .

[0060] In this way, the cold water pump assembly 60 can provide power for the cooling water output by the absorption chiller 21 so that the cooling water can flow back to the required equipment.

[0061] Specifically, in the embodiment of the present application, the cold water pump assembly 60 and the hot water pump assembly 50 have exactly the same structure.

[0062] Furthermore, the number of cold water pump assemblies 60 is also two groups, and the two groups of cold water pump assemblies 60 are connected in parallel. When the waste heat recovery system 100 is working, only one group of cold water pump assemblies 60 is turned on, and the other group is used as a backup. When any component of the cold water pump assembly 60 in use fails, the other group of backup cold water pump assembly 60 is turned on to work, so as to avoid equipment shutdown affecting production efficiency.

[0063] In some embodiments, the absorption chiller 21 is a lithium bromide chiller.

[0064] Thus, compared with other absorption refrigerators 21, the lithium bromide refrigerator has higher heat energy utilization efficiency, simpler structure, smoother operation, easier installation and more convenient maintenance.

[0065] Specifically, the absorption refrigerator 21 mainly includes an ammonia absorption refrigerator 21 and a lithium bromide refrigerator. In the embodiment of the present application, the absorption refrigerator 21 is a lithium bromide refrigerator.

[0066] Lithium bromide (LB) refrigeration units (also known as lithium bromide absorption chillers, or bromide chillers for short) are a common type of absorption chiller worldwide. They operate under vacuum, using water as the refrigerant and a lithium bromide aqueous solution as the absorbent to produce low-temperature water above 0°C. These units are commonly used in central air conditioning systems. Their operating principle is to achieve refrigeration by utilizing a lithium bromide aqueous solution to absorb and release water vapor at varying temperatures.

[0067] In other embodiments, the absorption refrigerator 21 may also be an ammonia absorption refrigerator 21 or other types of absorption refrigerators 21 according to actual needs, which will not be described in detail here.

[0068] See also Figure 1 and Figure 4 In some embodiments, the waste heat recovery device 20 includes a heat exchanger 22, and the heat exchanger 22 includes a third water inlet end 221 and a third water outlet end 222. High-temperature cooling water flows from the output end 11 into the third water inlet end 221, and medium-temperature cooling water flows from the third water outlet end 222 to the evaporative cooling tower 30.

[0069] In this way, the heat exchanger 22 can dissipate the heat of the high-temperature cooling water to a location that needs the heat for heating, heat preservation or heating.

[0070] Specifically, the heat exchanger 22 refers to an energy-saving device that transfers heat between two or more fluids at different temperatures, also known as a heat exchanger. Its working principle is based on the principle of heat conduction, that is, the process of transferring heat from a high-temperature object to a low-temperature object. In the heat exchanger 22, two fluids at different temperatures come into contact through the wall of the heat exchanger 22, thereby achieving heat exchange. On the production line, the heat exchanger 22 can be used in processes such as heating, cooling, evaporation or condensation to improve energy utilization, reduce energy consumption, and accurately control the temperature during the production process, thereby ensuring product quality and safe operation of equipment. In addition, it can also be used to heat the workshop.

[0071] In the embodiment of the present application, there can be multiple heat exchangers 22, and multiple heat exchangers 22 are arranged in series. It should be noted that when the number of heat exchangers 22 is large, attention should be paid to whether the temperature of the heat exchanger 22 at a farther distance can meet actual needs.

[0072] Furthermore, the third water inlet end 221 and the third water outlet end 222 are both connected to valves to facilitate the disassembly and assembly of the heat exchanger 22 .

[0073] Furthermore, a third remote pressure gauge 224, a third remote temperature gauge 225 and a third local temperature gauge 226 are installed on the first pipeline 10 near the third water inlet end 221, wherein the third remote pressure gauge 224 is used to monitor the water inlet pressure of the third water inlet end 221 and upload the data to the control end, the third remote temperature gauge 225 is used to monitor the water inlet temperature of the third water inlet end 221 and upload the data to the control end, and the third local temperature gauge 226 is used to monitor the water inlet temperature of the third water inlet end 221 and display it externally for on-site viewing.

[0074] Similarly, a fourth remote temperature meter 227 and a fourth local temperature meter 228 are installed on the first pipe 10 near the third water outlet end 222, wherein the fourth remote temperature meter 227 is used to monitor the outlet water temperature of the third water outlet end 222 and upload the data to the control end, and the fourth local temperature meter 228 is used to monitor the outlet water temperature of the third water outlet end 222 and display it externally for on-site viewing.

[0075] In certain embodiments, the heat exchanger 22 is a heating plate heat exchanger 22 .

[0076] In this way, the heating plate heat exchanger 22 can use the heat of the high-temperature cooling water to heat the factory building and other places, which is conducive to reducing production costs.

[0077] Specifically, the heating plate heat exchanger 22 is a highly efficient heat exchanger 22, constructed from a series of corrugated metal sheets stacked together. Thin rectangular channels are formed between the various plates, allowing heat exchange to occur. In this embodiment of the present application, the heating plate heat exchanger 22 can utilize the heat from high-temperature cooling water to heat workshops and factory buildings.

[0078] In some embodiments, the waste heat recovery system 100 further includes a bypass valve 70, one end of which is connected to the input end and the third water inlet end 221 through the first pipeline 10, and the other end of the bypass valve 70 is connected to the third water outlet end 222 and the evaporative cooling tower 30 through the first pipeline 10.

[0079] In this way, when heating is needed, the bypass valve 70 can be closed to allow high-temperature cooling water to flow through the heat exchanger 22. When heating is not needed, the bypass valve 70 can be opened to allow high-temperature cooling water to flow directly to the next device, thereby making the heating of the heat exchanger 22 more flexible.

[0080] Specifically, in the embodiment of the present application, the hot water pump assembly 50 is directly connected to the absorption chiller 21 through the bypass valve 70 , and a tee is provided at both ends of the bypass valve 70 , and the heat exchanger 22 is connected via the tee.

[0081] When heating is required, the bypass valve 70 can be closed and the valve connecting the third water inlet end 221 and the third water outlet end 222 can be opened, thereby allowing high-temperature cooling water to enter the heat exchanger 22. When heating is required, the bypass valve 70 can be opened and the valve connecting the third water inlet end 221 and the third water outlet end 222 can be closed, thereby allowing high-temperature cooling water to flow directly to the absorption chiller 21.

[0082] See also Figure 1 and Figure 4In some embodiments, the waste heat recovery system 100 further includes a fourth remote thermometer 227 and an electric regulating valve 223. The output end 11 is connected to the third water inlet end 221 through the electric regulating valve 223. The fourth remote thermometer 227 is arranged between the third water outlet end 222 and the evaporative cooling tower 30. The fourth remote thermometer 227 and the electric regulating valve 223 are electrically connected. The electric regulating valve 223 is configured to adjust the opening of the electric regulating valve 223 according to the outlet water temperature of the third water outlet end 222 obtained by the fourth remote thermometer 227 to control the flow rate of the third water inlet end 221.

[0083] In this way, the flow rate of the third water inlet end 221 is controlled by using the outlet water temperature, which is conducive to making the heat emitted by the heat exchanger 22 more stable and facilitating the control and maintenance of the temperature.

[0084] Specifically, the electric regulating valve 223 is a device used to control the flow of fluid. It drives the opening and closing of the valve through an electric motor to achieve automatic adjustment and control of parameters such as flow, pressure, and liquid level under different process conditions.

[0085] In the embodiment of the present application, the fourth remote temperature meter 227 can upload the real-time temperature of the third water outlet 222 to the control terminal. Since the real-time temperature of the third water outlet 222 can reflect the temperature of the heat exchanger 22 to a certain extent, the control terminal determines whether the current temperature can meet the actual demand. If the current temperature is too low to meet the actual demand, the electric control valve 223 is controlled to open wider, increasing the flow rate of high-temperature cooling water, thereby raising the temperature. If the current temperature is too high to meet the actual demand, the electric control valve 223 is controlled to open narrower, reducing the flow rate of high-temperature cooling water, thereby lowering the temperature.

[0086] In some embodiments, the waste heat recovery device 20 includes an absorption chiller 21 and a heat exchanger 22. High-temperature cooling water flows from the input end 11 into the heat exchanger 22, and medium-temperature cooling water flows from the heat exchanger 22 to the absorption chiller 21, and then flows from the absorption chiller 21 to the evaporative cooling tower 30.

[0087] In this way, by setting up two waste heat recovery devices at the same time, the heat in the condensed water can be recovered more fully.

[0088] In the embodiment of the present application, the waste heat recovery device 20 includes an absorption chiller 21 and a heat exchanger 22. The absorption chiller 21 and the heat exchanger 22 are connected in series. The heat exchanger 22 includes a third water inlet 221 and a third water outlet 222. The third water inlet 221 is connected to the hot water pump assembly 50, and the third water outlet 222 is connected to the absorption chiller 21.

[0089] In some embodiments, the high-temperature condensed water may first pass through the absorption chiller 21 , then pass through the heat exchanger 22 , and then enter the evaporative cooling tower 30 .

[0090] In some embodiments, the waste heat recovery device 20 may also use only one of the absorption chiller 21 and the heat exchanger 22 .

[0091] Throughout this specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0092] Furthermore, the terms "third" and "first" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "third" or "first" may explicitly or implicitly include at least one of the aforementioned features. In the description of this application, "plurality" means at least two, for example, two or three, unless otherwise specifically defined.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A waste heat recovery system, characterized in that: The waste heat recovery system comprises: a first pipeline, the first pipeline comprising an input end and an output end, the first pipeline being configured to receive high-temperature cooling water after cooling the production equipment from the input end and output low-temperature cooling water for cooling the production equipment from the output end; a waste heat recovery device, the waste heat recovery device being disposed in the first pipeline and configured to recover heat from the high-temperature cooling water to form medium-temperature cooling water; An evaporative cooling tower is provided in the first pipeline and is configured to cool the medium-temperature cooling water to provide low-temperature cooling water to the output end.

2. The waste heat recovery system according to claim 1, characterized in that: The waste heat recovery system further includes a hot water pump assembly, which is disposed in the first pipeline and configured to transport the high-temperature cooling water from the input end to the waste heat recovery device.

3. The waste heat recovery system according to claim 2, characterized in that: There are two groups of hot water pump assemblies, and the two groups of hot water pump assemblies are arranged in parallel in the first pipeline.

4. The waste heat recovery system according to claim 1, characterized in that: The waste heat recovery device includes an absorption chiller, which includes a first water inlet and a first water outlet. The high-temperature cooling water flows from the input end into the first water inlet, and the medium-temperature cooling water flows from the first water outlet to the evaporative cooling tower.

5. The waste heat recovery system according to claim 4, characterized in that: The waste heat recovery system further includes a cold water pump assembly, and the absorption chiller further includes a second water outlet end, which is connected to the cold water pump assembly through a second pipeline.

6. The waste heat recovery system according to claim 1, characterized in that: The waste heat recovery device includes a heat exchanger, which includes a third water inlet and a third water outlet. The high-temperature cooling water flows from the input end into the third water inlet, and the medium-temperature cooling water flows from the third water outlet to the evaporative cooling tower.

7. The waste heat recovery system according to claim 6, characterized in that: The heat exchanger is a heating plate heat exchanger.

8. The waste heat recovery system according to claim 7, characterized in that: The waste heat recovery system also includes a bypass valve, one end of which is connected to the input end and the third water inlet end through the first pipeline, and the other end of which is connected to the third water outlet end and the evaporative cooling tower through the first pipeline.

9. The waste heat recovery system according to claim 6, characterized in that: The waste heat recovery system also includes a fourth remote temperature meter and an electric regulating valve. The input end is connected to the third water inlet end through the electric regulating valve. The fourth remote temperature meter is arranged between the third water outlet end and the evaporative cooling tower. The fourth remote temperature meter and the electric regulating valve are electrically connected. The electric regulating valve is configured to adjust the opening of the electric regulating valve to control the flow rate of the third water inlet end according to the outlet water temperature of the third water outlet end obtained by the fourth remote temperature meter.

10. The waste heat recovery system according to claim 1, characterized in that: The waste heat recovery device includes an absorption refrigerator and a heat exchanger. The high-temperature cooling water flows from the input end into the heat exchanger, and the medium-temperature cooling water flows from the heat exchanger to the absorption refrigerator, and then flows from the absorption refrigerator to the evaporative cooling tower.

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