Heat exchange system

Abstract

The utility model relates to a heat exchange system. The heat exchange system comprises a heat exchange unit and a circulation unit. The heat exchange unit comprises heat exchange equipment, a material feeding module, a material discharging module, a heat exchange medium feeding module and a heat exchange medium discharging module, the circulating unit comprises a circulating pipeline and a circulating pump arranged on the circulating pipeline, and the two ends of the circulating pipeline communicate with the two ends, close to the material feeding module and the material discharging module, of the heat exchange equipment correspondingly. Through the arrangement, the heat exchange equipment and the circulating pipeline form a circulating path, materials in the heat exchange equipment can flow along the circulating path all the time by starting the circulating pump, and solid substances in the materials cannot be deposited in the heat exchange equipment, so that the problem of blockage in the heat exchange equipment is avoided, and the maintenance cost of the heat exchange equipment is reduced.

Description

Technical Field

[0001] This application relates to the technical field of energy conservation and environmental protection, and particularly to a heat exchange system. Background Art

[0002] With the rapid development of China's industry, various wastes generated therefrom have increased sharply. Among them, the emissions of various highly saline and difficult-to-degrade industrial wastewaters, such as the wastewaters in chemical industrial parks and coal chemical industry, have also increased significantly, bringing negative effects to economic development and causing great harm to the environment.

[0003] Facing such a severe situation, the concepts and technologies of zero liquid discharge of wastewater have emerged. Among them, relatively mature processes are various salt separation processes such as multi-effect evaporation crystallization thermal salt separation process, nanofiltration salt separation process, and freezing salt separation process. In the above various salt separation processes, heat exchange equipment is required to recover and utilize a part of the energy to reduce the operating energy consumption and heat exchange efficiency.

[0004] At present, during the process of heat recovery or cooling of heat exchange equipment, due to the substances that are prone to scaling and crystallization in highly concentrated salt water, the heat exchange equipment is often severely fouled and blocked, and frequent cleaning is required to restore the flow or heat exchange effect, increasing the maintenance cost of the equipment. Summary of the Utility Model

[0005] Based on this, in view of the problem that the heat exchange equipment is prone to be fouled and blocked during operation, it is necessary to provide a heat exchange system.

[0006] A heat exchange system, the heat exchange system includes a heat exchange unit and a circulation unit, wherein:

[0007] The heat exchange unit includes a heat exchange device and a material feed module, a material discharge module, a heat exchange medium feed module, and a heat exchange medium discharge module that are connected to the heat exchange device. The material feed module is used to introduce materials, the material discharge module is used to discharge the materials after heat exchange, the heat exchange medium feed module is used to introduce heat exchange media, and the heat exchange medium discharge module is used to discharge the heat exchange media after heat exchange;

[0008] The circulation unit includes a circulation pipeline and a circulation pump arranged on the circulation pipeline. Both ends of the circulation pipeline are respectively connected to both ends of the heat exchange device close to the material feed module and the material discharge module.

[0009] In one embodiment, the circulation unit further includes a flow meter installed on the circulation pipeline, and the flow meter is used to collect the circulation flow rate in the circulation pipeline;

[0010] The heat exchange system also includes a control unit that is communicatively connected to the flow meter and the circulation pump, and the control unit is used to calculate the material flow rate based on the preset cross-sectional area of ​​the circulation pipe and the received circulation flow rate, and to control the operating frequency of the circulation pump based on the material flow rate.

[0011] In one embodiment, the material flow rate is not less than 1.5 m / s.

[0012] In one of the embodiments, the heat exchange medium feed module includes a medium feed pipe and a regulating valve arranged on the medium feed pipe, one end of the medium feed pipe is connected to the heat exchange equipment, and the other end is used to introduce the heat exchange medium.

[0013] In one of the embodiments, the heat exchange system also includes a detection unit communicatively connected to the control unit, the detection unit includes a temperature detector installed in the circulation pipeline, the temperature detector is used to collect a temperature signal in the circulation pipeline, and the control unit is used to control the operation of the regulating valve according to the temperature signal.

[0014] In one embodiment, the heat exchange medium is steam or refrigerant.

[0015] In one of the embodiments, the circulation pump includes a pump body and a circulation inlet valve and a circulation outlet valve arranged on both sides of the pump body, and the circulation inlet valve is installed at one end of the circulation pipe close to the material discharge module.

[0016] In one of the embodiments, the flow meter is arranged on a side of the circulation outlet valve away from the pump body.

[0017] In one of the embodiments, the heat exchange medium discharge module includes a medium discharge pipe and a medium discharge valve, the medium discharge pipe is connected to the heat exchange equipment, and the medium discharge valve is installed on the medium discharge pipe.

[0018] In one of the embodiments, the medium discharge pipe and the medium feed pipe are both arranged on the outer wall of the heat exchange device, and are respectively located on the lower side of the heat exchange device and the upper side of the heat exchange device.

[0019] The above-mentioned heat exchange equipment is connected to the heat exchange equipment at both ends of the circulation pipeline, so that the heat exchange equipment and the circulation pipeline form a circulation path. By setting a circulation pump on the circulation pipeline, starting the circulation pump can make the material in the heat exchange equipment flow along the circulation path all the time, and the solid matter in the material cannot be deposited in the heat exchange equipment, thereby avoiding the blockage problem in the heat exchange equipment and reducing the maintenance cost of the heat exchange equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the photoresist bubble removal system provided for this application.

[0021] Wherein:

[0022] 10. Heat exchange system;

[0023] 100. Heat exchange unit; 110. Heat exchange equipment; 120. Material feeding module; 121. Material feeding pipe; 122. Material feeding valve; 130. Material discharging module; 131. Material discharging pipe; 132. Material discharging valve; 140. Heat exchange medium feeding module; 141. Medium feeding pipe; 142. Regulating valve; 150. Heat exchange medium discharging module; 151. Medium discharging pipe; 152. Medium discharging valve;

[0024] 200. Circulation unit; 210. Circulation pipeline; 220. Circulation pump; 221. Pump body; 222. Circulation inlet valve; 223. Circulation outlet valve; 224. Check valve; 230. Exhaust valve; 240. Flowmeter; 250. Pressure gauge;

[0025] 300. Detection unit; 310. Temperature detector. Detailed implementation manners

[0026] In order to make the above objects, features and advantages of this application more obvious and understandable, the following will describe the detailed implementation manners of this application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application 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 should not be construed as a limitation to this application.

[0028] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In this application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0032] Refer to Figure 1 , Figure 1The schematic diagram of a heat exchange system 10 in an embodiment of the present application is shown. The heat exchange system 10 provided in an embodiment of the present application includes a heat exchange unit 100 and a circulation unit 200. The heat exchange unit 100 includes a heat exchange device 110 and a material feed module 120, a material discharge module 130, a heat exchange medium feed module 140, and a heat exchange medium discharge module 150 that are connected to the heat exchange device 110.

[0033] The material feed module 120 is used to introduce materials, the material discharge module 130 is used to discharge the materials after heat exchange, the heat exchange medium feed module 140 is used to introduce the heat exchange medium, and the heat exchange medium discharge module 150 is used to discharge the heat exchange medium after heat exchange. With the above settings, during specific operations, after the heat exchange medium enters the heat exchange device 110 from the heat exchange medium feed module 140, it will exchange heat with the materials that enter the heat exchange device 110 from the material feed module 120. After the heat exchange between the heat exchange medium and the materials, the heat exchange medium flows out from the heat exchange medium discharge module 150, and the materials flow out from the material discharge module 130.

[0034] The circulation unit 200 includes a circulation pipeline 210 and a circulation pump 220 arranged on the circulation pipeline 210. The two ends of the circulation pipeline 210 are respectively connected to the two ends of the heat exchange device 110 close to the material feed module 120 and the material discharge module 130. When specifically arranged, an exhaust valve 230 is also arranged on the circulation pipeline 210, and the circulation pump 220 is preferably a large-flow and low-lift centrifugal pump. During specific operations, the materials enter the heat exchange device 110 from the material feed module 120. The exhaust valve 230 is opened to discharge the gas in the heat exchange device 110 to ensure that the materials fill the entire interior of the heat exchange device 110. The circulation pump 220 is started so that the materials are always in a flowing state. Then, solid substances in the materials (such as high-concentration brine), such as crystal particles, cannot deposit in the heat exchange device 110, thereby avoiding the blockage problem in the heat exchange device 110.

[0035] For the above heat exchange device 110, by setting both ends of the circulation pipeline 210 to be connected to the heat exchange device 110, a circulation path is formed between the heat exchange device 110 and the circulation pipeline 210. By arranging a circulation pump 220 on the circulation pipeline 210, starting the circulation pump 220 can make the materials in the heat exchange device 110 flow along the circulation path all the time, and the solid substances in the materials cannot deposit in the heat exchange device 110, thereby avoiding the blockage problem in the heat exchange device 110 and reducing the maintenance cost of the heat exchange device 110.

[0036] To ensure that the materials in the heat exchange device 110 can flow at a set flow rate, in a preferred embodiment, the circulation unit 200 further includes a flow meter 240 installed in the circulation pipeline 210. The flow meter 240 is used to collect the circulation flow rate in the circulation pipeline. The heat exchange system 10 further includes a control unit communicatively connected to the flow meter 240 and the circulation pump 220. The control unit is used to calculate the material flow rate based on the preset cross-sectional area of the circulation pipeline 210 and the received circulation flow meter 240, and the control unit is further used to control the operating frequency of the circulation pump 220 according to the material flow rate. When specifically set, the material flow rate is equal to the quotient of the circulation flow rate and the cross-sectional area of the circulation pipeline 210, where the cross-sectional area of the circulation pipeline 210 is preset in the control unit after measurement, and the control unit can be the quotient of a PCL controller.

[0037] With the above settings, the control unit controls the operating frequency of the circulation pump 220 according to the calculated material flow rate. When the calculated material flow rate is higher than the preset flow rate value, the control unit reduces the operating frequency of the circulation pump 220. When the calculated material flow rate is lower than the preset flow rate value, the control unit increases the operating frequency of the circulation pump 220, so as to ensure that the materials flow at the set flow rate.

[0038] It should be noted that, in addition to the above intelligent implementation method to ensure that the materials flow at the set flow rate, it can also be manually operated. Specifically, the worker divides the circulation flow rate displayed by the flow meter 240 by the cross-sectional area of the circulation pipeline 210 obtained by measurement to calculate the material flow rate, and then the worker manually adjusts the operating frequency of the circulation pump 220 according to the material flow rate.

[0039] It should be emphasized that when specifically set, the present application preferably ensures that the material flow rate is always not less than 1.5 m / s. The above material flow rate value is the optimal value obtained by the inventor through repeated experiments. When the material flow rate is not less than 1.5 m / s, it can ensure that the materials in the heat exchange device 110 are always in a turbulent state, so that the solid substances in the materials cannot deposit in the heat exchange device 110, avoiding the occurrence of fouling and blockage in the heat exchange device 110.

[0040] To more conveniently introduce the heat exchange medium into the heat exchange device 110 through the heat exchange medium feeding module 140. Specifically, the heat exchange medium feeding module 140 includes a medium feeding pipe 141 and a regulating valve 142 provided on the medium feeding pipe 141. One end of the medium feeding pipe 141 is connected to the heat exchange device 110, and the other end of the medium feeding pipe 141 is used to introduce the heat exchange medium. With the above settings, controlling the regulating valve 142 can achieve the flow rate of the heat exchange medium flowing into the heat exchange device 110.

[0041] It should be noted that it is difficult to accurately control the temperature of the current heat exchange device 110, making it difficult to control the material within the preset temperature. Based on this, in order to accurately control the temperature of the material, more specifically, the heat exchange system 10 further includes a detection unit 300 communicatively connected to the control unit. The detection unit 300 includes a temperature detector 310 installed in the circulation pipeline 210. The temperature detector 310 is used to collect the temperature signal in the circulation pipeline 210, and the control unit is used to control the operation of the regulating valve 142 according to the temperature signal. When specifically arranged, the detection unit 300 further includes a temperature measuring pipe and a temperature control valve. One end of the temperature measuring pipe is communicated with the circulation pipeline 210, the other end of the temperature measuring pipe is installed with a temperature detector 310, and the temperature control valve is installed on the temperature measuring pipe. The temperature in the circulation path can be detected by opening and closing the temperature control valve. Through the above arrangement, the opening degree of the valve port of the regulating valve 142 is controlled according to the temperature measured by the temperature detector 310 to control the inflow of the heat exchange medium, thereby controlling the heat exchange amount in the heat exchange device 110, and then controlling the material outlet temperature.

[0042] In order to realize preheating or precooling of the material by the heat exchange device 110, in a preferred embodiment, the heat exchange medium is steam or refrigerant. Through the above arrangement: when the heat exchange medium is steam, the steam exchanges heat with the material to realize preheating of the material. At this time, when the control unit determines that the measured temperature of the temperature detector 310 is higher than the set temperature, the control unit controls the valve port of the regulating valve 142 to be closed smaller to slow down the heat exchange, so that the measured temperature gradually approaches the set temperature; when the control unit determines that the measured temperature of the temperature detector 310 is lower than the set temperature, the control unit controls the valve port of the regulating valve 142 to be opened larger to accelerate the heat exchange, so that the measured temperature gradually approaches the set temperature. When the heat exchange medium is refrigerant, the refrigerant exchanges heat with the material to realize precooling of the material. At this time, when the control unit determines that the measured temperature of the temperature detector 310 is higher than the set temperature, the control unit controls the valve port of the regulating valve 142 to be opened larger to accelerate the heat exchange, so that the measured temperature gradually approaches the set temperature; when the control unit determines that the measured temperature of the temperature detector 310 is lower than the set temperature, the control unit controls the valve port of the regulating valve 142 to be closed smaller to slow down the heat exchange, so that the measured temperature gradually approaches the set temperature. It should be noted that the above adjustment method is also PID adjustment.

[0043] In order to design the circulation pump 220 more conveniently, specifically, the circulation pump 220 includes a pump body 221 and a circulation inlet valve 222 and a circulation outlet valve 223 arranged on both sides of the pump body 221. The circulation inlet valve 222 is installed at one end of the circulation pipe close to the material discharge module 130. In the specific setting, the circulation pump 220 also includes a check valve 224 and a pressure gauge 250. The check valve 224 is arranged on the side of the circulation outlet valve 223 away from the pump body 221. The check valve 224 is used to prevent the material in the circulation pipeline 210 from flowing back. The pressure gauge 250 is located between the pump body 221 and the circulation outlet valve 223. The pressure gauge 250 is used to display the pressure of the circulation pump 220, so that the workers can check the operating status of the circulation pump 220.

[0044] In order to accurately measure the circulation flow in the circulation pipeline 210, more specifically, the flow meter 240 is arranged on the side of the circulation outlet valve 223 away from the pump body 221. In the specific arrangement, the flow meter 240 is arranged on the side of the check valve 224 away from the circulation outlet valve 223.

[0045] In order to conveniently discharge the heat exchange medium after heat exchange from the heat exchange medium discharge module 150, more specifically, the heat exchange medium discharge module 150 includes a medium discharge pipe 151 and a medium discharge valve 152, the medium discharge pipe 151 is connected to the heat exchange device 110, and the medium discharge valve 152 is installed on the medium discharge pipe 151. Through the above configuration, the heat exchange medium can be controlled to flow out of the heat exchange device 110 by controlling the medium discharge valve 152. In the specific configuration, the medium discharge pipe 151 and the medium feed pipe 141 are both arranged on the outer wall of the heat exchange device 110, and the medium discharge pipe 151 and the medium feed pipe 141 are respectively located on the lower side of the heat exchange device 110 and the upper side of the heat exchange device 110. Through the above arrangement, the heat exchange medium enters from the lower end of the heat exchange equipment 110 and flows toward the upper end of the heat exchange equipment 110. In this process, the heat exchange medium exchanges heat with the material in the heat exchange equipment 110, and then is discharged from the heat exchange equipment 110 from the medium discharge pipe 151 at the upper end. The entire heat exchange process is simple, convenient and easy to operate.

[0046] To facilitate the introduction of materials into the material feeding module 120, the material feeding module 120 includes a material feeding pipe 121 and a material feeding valve 122 provided on the material feeding pipe 121. One end of the material feeding pipe 121 is connected to the heat exchange device 110, and the other end of the material feeding pipe 121 is used for introducing materials. To facilitate the discharge of the heat-exchanged materials from the material discharging module 130, the material discharging module 130 includes a material discharging pipe 131 and a material discharging valve 132. The material discharging pipe 131 is connected to the heat exchange device 110, and the material discharging valve 132 is installed on the material discharging pipe 131. Specifically, the material feeding pipe 121 is arranged at the top of the heat exchange device 110, and the material discharging pipe 131 is arranged at the end of the heat exchange device 110, facilitating the entry and discharge of materials from the heat exchange device 110.

[0047] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0048] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A heat exchange system, characterized in that, The heat exchange system comprises a heat exchange unit and a circulation unit, wherein: The heat exchange unit comprises a heat exchange device and a material feed module, a material discharge module, a heat exchange medium feed module and a heat exchange medium discharge module connected to the heat exchange device, wherein the material feed module is used to feed materials, the material discharge module is used to discharge the materials after heat exchange, the heat exchange medium feed module is used to feed heat exchange medium, and the heat exchange medium discharge module is used to discharge the heat exchange medium after heat exchange; The circulation unit includes a circulation pipeline and a circulation pump arranged in the circulation pipeline. Both ends of the circulation pipeline are respectively connected with both ends of the heat exchange device close to the material feeding module and the material discharging module.

2. The heat exchange system according to claim 1, wherein The circulation unit further comprises a flow meter installed on the circulation pipe, and the flow meter is used to collect the circulation flow in the circulation pipe; The heat exchange system also includes a control unit that is communicatively connected to the flow meter and the circulation pump, and the control unit is used to calculate the material flow rate based on the preset cross-sectional area of ​​the circulation pipe and the received circulation flow rate, and to control the operating frequency of the circulation pump based on the material flow rate.

3. The heat exchange system according to claim 2, characterized in that, The material flow rate is not less than 1.5 m / s.

4. The heat exchange system according to claim 2, characterized in that, The heat exchange medium feed module comprises a medium feed pipe and a regulating valve arranged on the medium feed pipe. One end of the medium feed pipe is connected to the heat exchange equipment, and the other end is used for introducing the heat exchange medium.

5. The heat exchange system according to claim 4, characterized in that, The heat exchange system also includes a detection unit that is communicatively connected to the control unit, the detection unit includes a temperature detector installed in the circulation pipeline, the temperature detector is used to collect a temperature signal in the circulation pipeline, and the control unit is used to control the operation of the regulating valve according to the temperature signal.

6. The heat exchange system according to claim 1, wherein, The heat exchange medium is steam or refrigerant.

7. The heat exchange system according to claim 2, wherein The circulation pump comprises a pump body and a circulation inlet valve and a circulation outlet valve arranged on both sides of the pump body. The circulation inlet valve is installed at one end of the circulation pipe close to the material discharge module.

8. The heat exchange system according to claim 7, wherein, The flow meter is arranged on a side of the circulation outlet valve away from the pump body.

9. The heat exchange system according to claim 4, wherein, The heat exchange medium discharge module includes a medium discharge pipe and a medium discharge valve. The medium discharge pipe is connected to the heat exchange equipment, and the medium discharge valve is installed on the medium discharge pipe.

10. The heat exchange system according to claim 9, characterized in that, The medium discharge pipe and the medium feed pipe are both arranged on the outer wall of the heat exchange device, and are respectively located at the lower side of the heat exchange device and the upper side of the heat exchange device.

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