Heat recycling system

Abstract

The utility model provides a heat recycling system which comprises a circulating water pool, the circulating water pool communicates with a heat circulation system of an air conditioner, and cooling return water enters the heat circulation system for heat supply in the environment with the environment temperature lower than the first preset temperature; the circulating water pipeline is used for conveying cooling return water used for cooling the equipment in the production line; and cooling return water in the circulating water pipeline enters the circulating water pool through the first recovery pipeline. According to the heat recycling system, the first recycling pipeline is arranged to communicate with the circulating water pool, in the low-temperature environment, cooling return water with the high temperature is directly used for heat supply of the heat circulating system, heat in the cooling return water is recycled for heat supply, a heat pump unit air conditioner does not need to be used for heating, energy consumption is reduced, and the energy consumption is reduced. The service life of a heat pump unit air conditioner is prolonged; and cooling return water does not need to be cooled, so that the use frequency of the cooling tower is reduced, and the service life of the cooling tower is prolonged.

Description

Technical Field

[0001] This application relates to the field of glass fiber production, and more particularly to a heat recovery and utilization system. Background Technology

[0002] During the glass fiber production process, the use of kilns, perforated plates, and air compressors generates a large amount of cooling return water at around 30°C. Currently, the cooling return water is treated by cooling it to around 18°C ​​through a cooling tower and then injecting it into a water tank to be resupplyed to the kilns, perforated plates, and air compressors as cooling water. In winter, when the workshop is heated, the cooled return water is also injected as a water source into the heat pump unit air conditioner for workshop heating.

[0003] Currently, the high-temperature cooling return water is first cooled and then heated by the heat pump unit, resulting in a waste of heat. The heat pump unit consumes a lot of electricity for air conditioning and heating, and the equipment maintenance cost is high. Furthermore, the frequent cooling of the cooling return water leads to high usage frequency, short lifespan, and high energy consumption of the cooling tower. Utility Model Content

[0004] To address the problem of wasted heat from high-temperature cooling return water and the high power consumption of heat pump units during winter heating, this application proposes a heat recovery and utilization system.

[0005] This application provides a heat recovery and utilization system, the heat recovery and utilization system comprising:

[0006] A circulating water tank is used to store cooling return water. The circulating water tank is connected to the air conditioning thermal circulation system. The cooling return water is used to enter the thermal circulation system for heating when the ambient temperature is lower than a first preset temperature.

[0007] The circulating water pipeline is connected to the cooling water pipeline of the production line, and the circulating water pipeline is used to transport the cooling return water used to cool the equipment in the production line.

[0008] The first recovery pipeline is connected to the circulating water pipeline and the circulating water pool respectively. The first recovery pipeline is equipped with a first valve. When the first valve is in the open state, the cooling return water in the circulating water pipeline enters the circulating water pool through the first recovery pipeline.

[0009] The heat recovery and utilization system further includes:

[0010] A cooling component is used to cool the cooling return water and then deliver it to the circulating water tank when the ambient temperature is higher than a second preset temperature.

[0011] The second recovery pipeline is connected to the circulating water pipeline and the cooling component respectively. The second recovery pipeline is equipped with a second valve. The first valve is in the closed state and the second valve is in the open state. The cooling return water in the circulating water pipeline enters the circulating water pool through the second recovery pipeline.

[0012] Wherein, along the depth direction of the circulating water pool, the height of the first recovery pipeline is lower than the height of the second recovery pipeline.

[0013] The cooling assembly includes a cooling tower and a cooling fan. The cooling fan drives airflow within the cooling tower to form a cooling airflow that cools the cooling return water.

[0014] The cooling assembly further includes:

[0015] A water collector is used to receive and collect the cooling return water flowing out of the second recovery pipeline;

[0016] A condensate drain is stacked on top of the water collector, and the condensate drain is used to filter the cooling return water in the water collector.

[0017] In this system, at least one of the first valve and the second valve is an electric valve, and the heat recovery and utilization system also includes a controller that is signal-connected to the electric valve.

[0018] The controller includes a temperature sensor for detecting ambient temperature.

[0019] The first valve and the second valve are manual valves.

[0020] The second valve is a check valve, and the check valve is positioned at a higher height than the first valve along the depth direction of the circulating water pool.

[0021] The connections between the first recovery pipeline and the circulating water pipeline, the connections between the first recovery pipeline and the circulating water pool, and the connections between the circulating water pipeline and the second recovery pipeline are all made using high-strength bolts.

[0022] Compared with the prior art, the present application has the following beneficial effects: The heat recovery and utilization system of the present application connects the first recovery pipeline to the circulating water tank, so that the higher temperature cooling return water can be directly used for heating in the heat circulation system under low temperature environment, and the heat in the cooling return water is recovered for production heating. There is no need to use heat pump unit air conditioning for heating, saving energy consumption and extending the service life of heat pump unit air conditioning; and the cooling return water does not need to be cooled again, which also reduces the frequency of use of cooling tower and extends the service life of cooling tower. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a heat recovery and utilization system according to an exemplary embodiment.

[0025] Figure Labels

[0026] 100: Circulating water tank; 110: Support platform; 200: Circulating water pipeline; 300: First recovery pipeline; 310: First valve; 400: Cooling component; 410: Cooling tower; 420: Cooling fan; 430: Water collector; 440: Drain condensate; 500: Second recovery pipeline; 510: Second valve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] This application provides a heat recovery and utilization system, comprising: a circulating water tank for storing cooling return water, the circulating water tank being connected to the air conditioning heat circulation system, the cooling return water being used to enter the heat circulation system for heating when the ambient temperature is lower than a first preset temperature; a circulating water pipeline connected to the cooling water pipeline of the production line, the circulating water pipeline being used to transport the cooling return water used to cool the equipment in the production line; and a first recovery pipeline connected to both the circulating water pipeline and the circulating water tank, the first recovery pipeline being equipped with a first valve, the first valve being in the open state, the cooling return water in the circulating water pipeline entering the circulating water tank through the first recovery pipeline. This heat recovery and utilization system, by setting up a first recovery pipeline connected to the circulating water tank, allows the higher-temperature cooling return water to be directly used for heating in the heat circulation system under low-temperature conditions, recovering the heat from the cooling return water for production heating, eliminating the need for heat pump units for air conditioning heating, saving energy consumption, and extending the service life of heat pump units; furthermore, the cooling return water does not need to be cooled again, reducing the frequency of cooling tower use and extending the service life of the cooling tower.

[0030] According to an exemplary embodiment, such as Figure 1 As shown, this application provides a heat recovery and utilization system, including a circulating water tank 100, a circulating water pipeline 200, a first recovery pipeline 300, a cooling component 400, and a second recovery pipeline 500.

[0031] In the glass fiber production process, equipment such as kilns, spinnerets, and air compressors require cooling water during operation, generating a large amount of cooling return water at around 30°C. A circulating water tank 100 is used to store this cooling return water, and the circulating water tank 100 is connected to the heat circulation system of the production line workshop's air conditioning system, as well as to the various equipment production lines within the workshop.

[0032] The circulating water pipeline 200 is connected to the cooling water pipeline of the production line. The circulating water pipeline 200 is used to transport the cooling return water used to cool the equipment in the production line. During normal operation, the higher temperature cooling return water is transported to the cooling component 400 for cooling through the circulating water pipeline 200, and then fed into the circulating water tank 100. The cooled cooling return water is then injected back into each piece of equipment in the production line to cool each piece of equipment, forming a cooling water circulation. However, in the current cooling water circulation, the higher temperature cooling return water is first cooled and then heated by the heat pump unit, resulting in a waste of heat. The heat pump unit has high energy consumption, and the frequent cooling leads to high usage frequency, short lifespan, and high energy consumption of the cooling components.

[0033] This application includes a first recovery pipeline 300, which is connected to both the circulating water pipeline 200 and the circulating water tank 100. The first recovery pipeline 300 and the circulating water pipeline 200 can be welded together. A first valve 310 is installed on the first recovery pipeline 300. When the first valve 310 is open, the cooling return water in the circulating water pipeline 200 directly enters the circulating water tank 100 through the first recovery pipeline 300. In environments where the ambient temperature is lower than a first preset temperature, the cooling return water directly enters the heat circulation system for heating. The first preset temperature can be 10℃, or it can be set according to requirements. That is, when the workshop temperature is low and heating is required, the higher-temperature cooling return water is directly used in the heat circulation system for water-based heating. This application recovers the heat from the cooling return water for production heating, eliminating the need for heat pump units for air conditioning, saving energy and extending the service life of the heat pump units. Simultaneously, the cooling return water does not need further cooling, reducing the frequency of use of the cooling components and extending their service life.

[0034] The cooling component 400 is used to cool the cooling return water and then deliver it to the circulating water tank 100 when the ambient temperature is higher than the second preset temperature. The second preset temperature can be the same as the first preset temperature, that is, when the temperature is higher than the first preset temperature, the cooling component 400 cools the cooling return water, and when it is lower than the first preset temperature, the cooling return water is not cooled and is directly used for heating; the second preset temperature can also be different from the first preset temperature, and the second preset temperature can be set according to actual needs.

[0035] like Figure 1 As shown, in this embodiment, the cooling assembly 400 includes a cooling tower 410, a cooling fan 420, a water collector 430, and a drain 440.

[0036] Cooling fan 420 is used to drive airflow in cooling tower 410 to form cooling airflow to cool the cooling return water passing through cooling tower 410. Multiple sets of cooling tower 410 and cooling fan 420 can be set as needed to improve cooling efficiency.

[0037] The water collector 430 is used to collect the cooling return water flowing out of the second recovery pipe 500. The steam trap 440 is stacked on top of the water collector 430 and is used to filter the cooling return water in the water collector 430. A support platform 110 is provided on the circulating water tank 100. The support platform 110 is used to install the water collector 430 and the steam trap 440, with the steam trap 440 located between the water collector 430 and the support platform 110. By setting up the water collector 430 and the steam trap 440, it is convenient to collect the cooling return water that needs to be cooled, and the cooling return water is filtered to ensure the water quality of the circulating cooling water.

[0038] The second recovery pipeline 500 is connected to both the circulating water pipeline 200 and the cooling assembly 400. The second recovery pipeline 500 is equipped with a second valve 510. When the first valve 310 is closed and the second valve 510 is open, the cooling return water in the circulating water pipeline 200 enters the circulating water tank 100 through the second recovery pipeline 500. Before entering the circulating water tank 100, it is cooled by the cooling tower 410. The cooled return water is then reinjected into each production line to cool the equipment, forming a cooling water circulation. The second recovery pipeline 500 ensures the normal cooling of the return water, forming a circulating supply of cooling water for the production lines.

[0039] In this embodiment, the height of the first recovery pipe 300 is lower than the height of the second recovery pipe 500 along the depth direction of the circulating water pool 100, i.e., the vertical direction. This arrangement ensures that all cooling return water flows directly into the circulating water pool 100 during heating. Alternatively, the second valve 510 can be configured as a check valve, with its height along the depth direction of the circulating water pool 100 higher than that of the first valve 310. This ensures that cooling return water does not flow back into the second recovery pipe 500. When the first valve 310 is opened, the water level in the second recovery pipe 500 will not rise, further ensuring that cooling return water flows directly into the circulating water pool 100.

[0040] In some embodiments, one of the first valve 310 and the second valve 510 is an electric valve, or both may be electric valves. The heat recovery system also includes a controller (not shown in the figure), which is signal-connected to the electric valves. The controller includes a temperature sensor for detecting the ambient temperature of the production line. The controller can be a PLC (Programmable Logic Controller) system, which has advantages such as high reliability, flexible configuration, and fast operation. The PLC control system controls the opening and closing of the electric valves based on whether the detected temperature reaches the corresponding preset temperature, improving system response speed and saving manpower. A temperature sensor can also be installed on the circulating water pipeline to detect the temperature of the cooling return water. The PLC control system adjusts the opening of the electric valves based on the cooling return water temperature for more precise control of the heating temperature.

[0041] In some other embodiments, both the first valve 310 and the second valve 510 are manual valves. Commonly used butterfly valves can be selected, as they are low-cost and easy to control. For example, the first valve 310 can be a flanged bidirectional soft-seal turbine butterfly valve with an SS304 stainless steel valve plate, and the second valve 510 can be a flanged slow-closing butterfly check valve. In summer, the first valve 310 is closed and the second valve 510 is open, forming normal cooling water circulation to ensure cooling of the production line equipment. In winter, during heating, the first valve 310 is manually opened and the second valve 510 is closed, so that the system switches from normal cooling water circulation to direct heating through cooling water return heat recovery. The water temperature can be controlled at around 25℃-30℃, causing the original heating water source heat pump unit air conditioner to shut down, reducing energy consumption and lowering equipment maintenance and upkeep costs.

[0042] In this embodiment, the connections between the first recovery pipeline 300 and the circulating water pipeline 200, the first recovery pipeline 300 and the circulating water tank 100, and the circulating water pipeline 200 and the second recovery pipeline 500 are all made of high-strength bolts. The bolts can be grade 8.8 or higher and are treated with anti-corrosion measures. The circulating water pipeline 200, the first recovery pipeline 300, and the second recovery pipeline 500 are all made of carbon steel, and the buried portions are treated with internal and external anti-corrosion measures. These features improve the structural stability and corrosion resistance of the heat recovery system.

[0043] In summary, the heat recovery and utilization system of this application opens the first recovery pipeline when heating is needed in winter. The higher-temperature cooling return water directly enters the circulating water tank through the first recovery pipeline, recovering the heat in the cooling return water. This replaces the water source heat pump unit for air conditioning and heating, achieving a stable heat source for heating, reducing the consumption of electricity and steam, and lowering the maintenance costs of heating and air conditioning equipment. At the same time, the cooling return water does not need to be cooled by a cooling tower, reducing the frequency of cooling tower use and extending the service life of the cooling tower.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A heat recovery and utilization system, characterized in that, The heat recovery and utilization system includes: A circulating water tank is used to store cooling return water. The circulating water tank is connected to the air conditioning thermal circulation system. The cooling return water is used to enter the thermal circulation system for heating when the ambient temperature is lower than a first preset temperature. The circulating water pipeline is connected to the cooling water pipeline of the production line, and the circulating water pipeline is used to transport the cooling return water used to cool the equipment in the production line. The first recovery pipeline is connected to the circulating water pipeline and the circulating water pool respectively. The first recovery pipeline is equipped with a first valve. When the first valve is in the open state, the cooling return water in the circulating water pipeline enters the circulating water pool through the first recovery pipeline.

2. The heat recovery and utilization system according to claim 1, characterized in that, The heat recovery and utilization system also includes: A cooling component is used to cool the cooling return water and then deliver it to the circulating water tank when the ambient temperature is higher than a second preset temperature. The second recovery pipeline is connected to the circulating water pipeline and the cooling component respectively. The second recovery pipeline is equipped with a second valve. The first valve is in the closed state and the second valve is in the open state. The cooling return water in the circulating water pipeline enters the circulating water pool through the second recovery pipeline.

3. The heat recovery and utilization system according to claim 2, characterized in that, Along the depth direction of the circulating water pool, the height of the first recovery pipeline is lower than the height of the second recovery pipeline.

4. The heat recovery and utilization system according to claim 2, characterized in that, The cooling assembly includes a cooling tower and a cooling fan. The cooling fan drives airflow within the cooling tower to form a cooling airflow that cools the cooling return water.

5. The heat recovery and utilization system according to claim 2, characterized in that, The cooling assembly also includes: A water collector is used to receive and collect the cooling return water flowing out of the second recovery pipeline; A condensate drain is stacked on top of the water collector, and the condensate drain is used to filter the cooling return water in the water collector.

6. The heat recovery and utilization system according to claim 2, characterized in that, At least one of the first valve and the second valve is an electric valve, and the heat recovery system further includes a controller that is signal-connected to the electric valve.

7. The heat recovery and utilization system according to claim 6, characterized in that, The controller includes a temperature sensor for detecting ambient temperature.

8. The heat recovery and utilization system according to claim 2, characterized in that, The first valve and the second valve are manual valves.

9. The heat recovery and utilization system according to claim 3, characterized in that, The second valve is a check valve, and the check valve is positioned at a higher height than the first valve along the depth direction of the circulating water pool.

10. The heat recovery and utilization system according to claim 2, characterized in that, The connections between the first recovery pipeline and the circulating water pipeline, the connections between the first recovery pipeline and the circulating water tank, and the connections between the circulating water pipeline and the second recovery pipeline are all made using high-strength bolts.

Images