Extruder circulating water deionization anti-blocking device, waste heat utilization system and method

Abstract

The present application relates to the field of plastic extrusion granulation and molding machine, and particularly discloses an extruder circulating water deionization anti-blocking device, a waste heat utilization system and method, the device uses the waste heat generated in the cooling process of the cylinder to produce distilled water in the evaporation condensation module, the distilled water enters the cooling water tank, and the circulating water in the cooling water tank is distilled water without calcium, magnesium and iron ions, completely solving the problem of fouling and blocking of the cylinder cooling flow channel, the device effectively recycles the waste heat of the superheated steam, reduces the demand for external cooling water, saves energy, and practice proves that the device, system and method effectively utilize the waste heat, completely solve the problem of cylinder fouling and blocking in the field of plastic extrusion granulation and molding machine, and have certain expected economic benefits.

Description

Technical Field

[0001] This invention relates to the field of plastic extrusion granulation and molding machines, and specifically discloses an extruder circulating water deionization and anti-clogging device, a waste heat utilization system and method. Background Technology

[0002] An extruder is a piece of equipment used for plastic processing. It is a mechanical device that produces various plastic products by heating and melting plastic raw materials (such as granules, powders, or recycled materials) and extruding them through a die of a specific shape under certain pressure and temperature. It is used in the production of products such as pipes, profiles, sheets, and tubes. During the extrusion process, the barrel needs to be heated to heat the plastic raw materials to a sufficient temperature so that they enter a fluid state, which facilitates the driving and mixing of the screw. Reasonable heating control can ensure that the material reaches the appropriate melting point and avoid product quality problems caused by overheating or uneven heating. Therefore, while the cylinder is equipped with a thermocouple, a liquid flow chamber also needs to be installed inside. Circulating water is pumped into the liquid flow chamber and vaporizes into superheated steam. In order to achieve uniform control of the cylinder temperature, the cross-sectional size of the liquid flow chamber often needs to be controlled. The circulating liquid flows in the liquid flow chamber and evaporates to form superheated steam. During this process, salt deposits mainly composed of calcium, silicon, magnesium and iron are formed in the liquid flow chamber. Since the cylinder is made of metal and the cross-sectional size of the liquid flow chamber is not large, the cylinder per unit volume surrounds the liquid flow chamber, which makes it difficult to clean the blockage. Moreover, the extruder cylinder is particularly expensive. Summary of the Invention

[0003] In view of the existing technology, the first aspect of this invention proposes an extruder circulating water deionization and anti-clogging device for reusing and removing ions such as calcium, magnesium, silicon, and iron from the circulating water of the extruder, so as to completely solve the clogging problem of the liquid flow chamber inside the extruder barrel, including:

[0004] An evaporation and condensation module contains an evaporating liquid. The evaporation and condensation module includes a heat exchange component, at least a portion of which is immersed in the evaporating liquid. The heat exchange component has a hollow section inside, which is used to contain superheated steam delivered from the extruder.

[0005] A cooling water supply module, comprising a cooling water circulation pump, wherein the inlet pipe of the cooling water circulation pump extends into a cooling water tank, and the cooling water circulation pump is used to supply circulating water to the extruder;

[0006] A condensing mechanism for condensing conventional vapor generated by the evaporating liquid;

[0007] An overflow pipe is provided between the cooling water supply module and the evaporation and condensation module;

[0008] In the first state, the superheated steam enters the hollow section and condenses to form the first condensate; the evaporating liquid evaporates to form the conventional steam, which is then condensed by the metal cover to form the second condensate; the first condensate and the second condensate are jointly incorporated into the circulating water of the cooling water supply module.

[0009] In the first state, the level of the circulating water in the cooling water tank rises, and part of the circulating water enters the evaporation and condensation module through the overflow pipe and flows into the evaporation liquid.

[0010] In some first-aspect embodiments of the present invention, the evaporation-condensation module further includes an evaporation chamber, one end of which has an opening, the heat exchange component and the evaporating liquid are placed together in the evaporation chamber, and the heat exchange component introduces the superheated steam from the extruder through a superheated steam pipe, the superheated steam pipe being connected to the heat exchange component in the direction of steam flow.

[0011] In some embodiments of the first aspect of the present invention, one end of the cooling water tank is provided with an opening, and the metal cover is disposed above the opening of the evaporator and the cooling water tank. In the vertical direction, the projection area of ​​the evaporator is within the projection area of ​​the metal cover. The metal cover gradually approaches the cooling water tank in the vertical direction from the evaporator to the cooling water tank, and the overflow pipe connects the cooling water tank and the evaporator.

[0012] In the first state, after the evaporating liquid evaporates, it forms steam. The steam comes into contact with the metal cover and produces the second condensate. The second condensate flows along the metal cover toward the cooling water tank and then drips into the cooling water tank.

[0013] In some embodiments of the first aspect of the present invention, the heat exchange component is a regular or irregular hollow polygonal box, or the heat exchange component is a hollow cylinder, or the heat exchange component is a metal coil.

[0014] In some first-aspect embodiments of the present invention, a plurality of fins are fixedly provided on the wall surface of the heat exchange assembly.

[0015] In some embodiments of the first aspect of the invention, the heat exchange assembly is detachably connected to the evaporator.

[0016] In some first-aspect embodiments of the present invention, the extruder circulating water deionization and anti-clogging device includes a first microcontroller module and a first solenoid valve; the evaporator has a water inlet pipe, and the first solenoid valve is disposed at the water inlet pipe; a liquid level device is disposed inside the evaporator, the liquid level device is signal-connected to the first microcontroller module, and the first microcontroller module is used to receive the signal from the liquid level device to control the opening and closing of the first solenoid valve.

[0017] In some embodiments of the first aspect of the present invention, a cooling coil is provided inside the cooling water tank, the cooling coil being used to reduce the temperature of the cooling water tank.

[0018] In some embodiments of the first aspect of the present invention, the cooling water tank is provided with a temperature sensor, and the inlet of the cooling coil is provided with a second solenoid valve; the temperature sensor is signal-connected to the first microcontroller module, which is used to receive the temperature sensor signal to control the opening and closing of the second solenoid valve.

[0019] A second aspect of the present invention proposes an extruder circulating water waste heat utilization system, comprising,

[0020] In any of the extruder circulating water deionization and anti-clogging devices described in the first aspect, the cooling water circulating pump outlet pipe is equipped with a third solenoid valve;

[0021] An extruder, comprising an extruder barrel and a second microcontroller module, wherein the extruder barrel is equipped with a temperature sensor connected to the second microcontroller module, and the second microcontroller module is used to control the opening and closing of a third solenoid valve.

[0022] In the first state, the second microcontroller module controls the third solenoid valve to open, and the cooling water circulation pump pumps circulating water to the extruder barrel. The circulating water evaporates into superheated steam through the extruder barrel. The superheated steam enters the hollow part, and the superheated steam undergoes heat conduction with the evaporating liquid.

[0023] The superheated steam condenses to form the first condensate, and the evaporated liquid evaporates to form regular steam. The regular steam condenses through the metal cover to form the second condensate. The first and second condensates flow together into the circulating water of the cooling water supply module to reduce the calcium and magnesium ion content of the circulating water, thereby solving the problem of blockage in the circulating water flow cavity inside the extruder barrel.

[0024] In the first state, the circulating water level in the cooling water supply module rises, and part of the circulating water enters the evaporation and condensation module through the overflow pipe and flows into the evaporator.

[0025] A third aspect of the present invention provides a method for utilizing waste heat from extruder circulating water, using any of the extruder circulating water deionization and anti-clogging devices described in the first aspect, comprising:

[0026] Step 1: The superheated steam from the extruder enters the hollow part of the heat exchange assembly, where it exchanges heat with the evaporating liquid;

[0027] Step 2: The superheated steam is condensed to form the first condensate, and the evaporating liquid evaporates to form conventional steam through heat exchange. The conventional steam condenses upon contact with the metal cover to form the second condensate. The first and second condensates flow into the cooling water supply module, and the liquid level in the cooling water supply module rises.

[0028] Step 3: The liquid level in the cooling water supply module rises to a predetermined value and overflows into the evaporation and condensation module. The cooling water circulation pump then pumps circulating water to the extruder.

[0029] In this invention, the "first microcontroller" and "second microcontroller" can be selected from logic circuits, industrial PLC modules, MCUs (microcontrollers), etc.

[0030] In this invention, the extruder can be called an extruder, a plastic extruder, or a twin-screw extruder granulator.

[0031] Advantages of this invention:

[0032] This invention utilizes the coordinated operation of an evaporation-condensation module, heat exchange components, a cooling water supply module, and a condensation mechanism. It employs waste heat generated during barrel cooling to produce distilled water in the evaporation-condensation module. This distilled water then enters a cooling water tank, where the circulating water is free of calcium, magnesium, and iron ions, effectively resolving the issues of scaling and blockage in the barrel's cooling channels. This invention effectively recovers and utilizes the waste heat from superheated steam, reducing the demand for external circulating water (distilled water) and saving energy. Practical experience has demonstrated that this device, system, and method effectively utilize waste heat, completely resolving the problems of scaling and blockage in plastic extrusion granulation and molding machine barrels, and possesses certain expected economic benefits. Attached Figure Description

[0033] Figure 1 This diagram shows the piping and equipment connection of the extruder cooling system of the present invention;

[0034] Figure 2 This invention presents a first structural diagram of the extruder circulating water deionization and anti-clogging device;

[0035] Figure 3 This invention presents a second structural diagram of the extruder circulating water deionization and anti-clogging device from a first perspective.

[0036] Figure 4 This is a second structural diagram and second perspective of the extruder circulating water deionization and anti-clogging device of the present invention;

[0037] Figure 5 This invention provides a schematic diagram illustrating the generation of the first and second condensates.

[0038] Figure 6 This diagram shows the external structure of the housing when the heat exchange component of the present invention is used;

[0039] Figure 7 Show Figure 6 The heat exchange component AA is shown in cross-sectional view.

[0040] Figure 8 This is a first-angle view of the external structure of the multiple boxes connected in series according to the present invention;

[0041] Figure 9 This is a second-angle view of the external structure of the multiple boxes connected in series according to the present invention;

[0042] Figure 10 Show cross-sectional view of the extruder barrel;

[0043] 1. Evaporation and condensation module; 11. Heat exchange assembly; 111. Hollow section; 112. Fins; 113. Housing; 114. Metal coil; 12. Evaporator; 13. Superheated steam pipe; 131. Flange; 15. First solenoid valve; 16. Liquid level device; 17. Steam water tank makeup pipe; 2. Cooling water supply module; 21. Cooling water circulation pump; 211. Cooling water circulation pump inlet pipe; 212. Cooling water circulation pump outlet pipe; 213. Third solenoid valve ; 214, Cooling water circulation pump return pipe; 2141, Return valve; 22, Cooling water tank; 221, Cooling coil; 222, Temperature sensor; 223, Second solenoid valve; 23, Circulating water take-off pipe; 3, Metal cover; 31, Overflow pipe; 4, Extruder barrel; 41, Liquid flow chamber; 42, Cooling water inlet; 43, Extrusion channel; 44, Superheated steam outlet; 5, First microcontroller module; 6, Base; 7, Drain valve; 8, Second microcontroller module. Detailed Implementation

[0044] The present invention will be further described below with reference to specific embodiments. It is worth noting that these embodiments are only for illustrating the present invention and are not intended to limit the present invention in any way. Improvements and adjustments made by those skilled in the art based on the present invention in practical applications still fall within the protection scope of the present invention.

[0045] Please see Figures 1 to 5 This invention proposes an extruder circulating water deionization and anti-clogging device for reusing and removing calcium, magnesium, and silicon ions from the circulating water of the extruder, thereby solving the clogging problem of the liquid flow chamber 41 inside the extruder barrel 4. Furthermore, it utilizes the waste heat of superheated steam to produce circulating water, thereby reducing the concentration of calcium, magnesium, and iron ions in the water. The device includes:

[0046] The evaporation and condensation module 1 contains an evaporating liquid, which is water. The evaporation and condensation module 1 includes a heat exchange component 11 and an evaporation chamber 12. The evaporation chamber 12 is open at one end and contains the evaporating liquid. At least a portion of the heat exchange component 11 is immersed in the evaporating liquid. The heat exchange component 11 has a hollow part 111 inside. The superheated steam pipe 13 is connected to the heat exchange component 11 and is used to transport superheated steam to the hollow part 111. For example, the superheated steam generated by the extruder barrel 4 is transported from the extruder barrel 4 to the heat exchange component 11 via the superheated steam pipe 13. The hollow part 111 inside the heat exchange component 11 is used to contain the superheated steam transported from the extruder.

[0047] The superheated steam in the hollow part 111 of the heat exchange component 11 and the evaporating liquid in contact with the heat exchange component 11 undergo heat conduction. The superheated steam condenses to form the first condensate. The first condensate flows into the cooling water supply module 2 from the direction of arrow F1, that is, into the cooling water tank 22.

[0048] The cooling water supply module 2 includes a circulation pump 21, with the circulation pump inlet pipe 211 extending into the cooling water tank 22 to draw circulating water from the cooling water tank 22 as shown in direction F4. The circulation pump 21 is used to supply circulating water to the extruder barrel 4 as shown in direction F4a.

[0049] The evaporating liquid evaporates under the action of heat conduction to form conventional steam. The conventional steam comes into contact with the metal cover 3 from the direction of arrow G1. One side of the metal cover 3 is in contact with the atmospheric environment, and the other side is in contact with the conventional steam. The conventional steam condenses to produce second condensate, which adheres to the metal cover 3.

[0050] like Figure 5 As shown, Figure 5 Using up and down arrows to indicate the vertical direction, one end of the cooling water tank 22 has an opening, and the metal cover 3 is placed above the opening of the evaporator 12 and the cooling water tank 22. In the vertical direction, the projection area of ​​the evaporator 12 is within the projection area of ​​the metal cover 3. The metal cover 3 gradually approaches the cooling water tank 22 in the vertical direction from the evaporator 12 to the cooling water tank 22. The condensate attached to the metal cover 3 gathers and drips onto the cooling water tank 22, as shown in direction F2.

[0051] Overflow pipe 31 connects cooling water tank 22 and evaporator 12.

[0052] In the first state, i.e. the device is in operation, superheated steam enters the hollow part 111, and the superheated steam condenses to form the first condensate. After the evaporator evaporates, it forms regular steam. The regular steam condenses through the metal cover 3 to form the second condensate. The first condensate and the second condensate flow together into the circulating water of the cooling water supply module 2, and further into the cooling water tank 22.

[0053] In the first state, the level of circulating water in the cooling water tank 22 rises, and some of the circulating water enters the evaporation and condensation module 1 through the overflow pipe 31, and further enters the evaporation tank 12. As shown by arrow F3, this part of the circulating water flows into the evaporating liquid, bringing calcium, magnesium, silicon and iron salt ions in the cooling water tank 22 into the evaporation tank 12.

[0054] In some alternative embodiments, the heat exchange assembly 11 introduces superheated steam from the extruder via a superheated steam pipe 13, and the superheated steam pipe 13 connects several heat exchange assemblies 11 in the direction of steam flow.

[0055] like Figures 6 to 9 Preferably, in order to further increase the heat exchange efficiency, the heat exchange component 11 is a regular or irregular hollow polygonal box 113, or the heat exchange component 11 is a hollow cylinder, or the heat exchange component 11 is a metal coil 114.

[0056] Preferably, a plurality of fins 112 are fixedly inserted into the wall of the heat exchange component 11.

[0057] In some alternative embodiments, the heat exchange assembly 11 is detachably connected to the evaporator 12. For example, the metal coil 114 and the evaporator 12 are connected by a flange 131. When there are too many calcium, magnesium, silicon and iron ions in the chamber, salt will accumulate on the surface of the metal coil. The coil can be disassembled through the flange 131 to easily clean the internal environment of the evaporator 12.

[0058] In some optional embodiments, a cooling coil 221 is placed inside the cooling water tank 22. The cooling coil 221 is used to reduce the temperature of the cooling water tank 22. The inlet of the cooling coil 221 is connected to a pressurized water source, such as municipal tap water. The water flow in the cooling coil 221 is controlled by a second solenoid valve 223. The second solenoid valve 223 is signal-connected to the first microcontroller module 5. A temperature sensor 222 is also placed inside the cooling water tank 22. The temperature sensor 222 is signal-connected to the first microcontroller module 5 and transmits a signal to the first microcontroller module 5 to control the opening and closing of the second solenoid valve 223, thereby controlling the water flow in the cooling coil 221. The direction of the water flow in the cooling coil 221 is as shown in direction F6.

[0059] In some embodiments, the extruder circulating water deionization and anti-clogging device further includes a first microcontroller module 5 and a first solenoid valve 15. The evaporator 12 has a water inlet pipe, and the first solenoid valve 15 is located at the water inlet pipe. A liquid level device 16 is provided inside the evaporator 12. The liquid level device 16 is signal-connected to the first microcontroller module 5. The first microcontroller module 5 is used to receive the signal from the liquid level device 16 to control the opening and closing of the first solenoid valve 15, thereby controlling the pressurized water source, such as tap water, to enter the evaporator 12 so that the liquid level in the evaporator 12 is not too low, as shown by arrow F7. Water is also added to the evaporator 12, so that the circulating water volume in the cooling water tank 22 increases during the circulation process, reducing the conductivity of the circulating water and solving the clogging problem of the liquid flow chamber 41 inside the extruder barrel 4. The system utilizes waste heat, generating certain economic benefits.

[0060] In some embodiments, the circulating pump 21 operates continuously, and the circulating pump outlet pipe 212 is also connected to the circulating pump return pipe 214. The circulating pump return pipe 214 is equipped with a return valve 2141, which can be a ball valve, butterfly valve, etc. In the first state, the circulating pump 21 pumps circulating water to the extruder, as shown by arrow F4a, while another part of the circulating liquid returns to the cooling water tank 22 from the circulating pump return pipe 214, as shown by direction F4b, to prevent excessive pressure from causing equipment damage if the circulating pump outlet pipe 212 is blocked.

[0061] In some embodiments, the outer periphery of the evaporator 12 wall panel is also covered with insulation material, which may be asbestos, ceramic fiber, graphite felt, aluminum silicate, aerogel insulation cotton, or polymer foamed resin insulation cotton.

[0062] In some embodiments, the evaporator 12 and the cooling water tank 22 are also provided with drain valves, wherein the drain valve provided in the evaporator 12 is used to discharge water with high calcium and magnesium ions, as shown in the direction of arrow F5.

[0063] like Figure 1 As shown, the present invention provides a waste heat utilization system for extruder circulating water, including an extruder circulating water deionization and anti-clogging device as described in any embodiment of the present invention, and a third solenoid valve 213 installed on the outlet pipe 212 of the cooling water circulating pump for controlling the flow rate of circulating water pumped by the cooling water circulating pump 21 to the extruder. The third solenoid valve 213 is connected to the second microcontroller module 8.

[0064] The second microcontroller module 8 is also connected to the temperature control sensor embedded in the extruder barrel 4. Based on the temperature control sensor signal, the second microcontroller module 8 controls the opening and closing degree of the third solenoid valve 213.

[0065] In the first state, the second microcontroller module 8 controls the third solenoid valve 213 to open, and the circulating pump 21 pumps circulating water to the extruder barrel 4. The circulating water absorbs heat through the liquid flow chamber 41 of the extruder barrel 4 and evaporates into superheated steam. The superheated steam enters the hollow section 111 from the superheated steam pipe 13. In the hollow section 111, the superheated steam undergoes heat conduction with the evaporated liquid.

[0066] Superheated steam condenses to form the first condensate, which enters the cooling water tank 22 as indicated by arrow F1. After the evaporator evaporates, it forms regular steam. The regular steam condenses through the metal cover 3 to form the second condensate. The first and second condensates flow together into the circulating water in the cooling water tank 22, raising the circulating water level. The circulating water flows from the overflow pipe 31 into the evaporator 12 to reduce the amount of calcium and magnesium ions in the circulating water.

[0067] In the first state, the circulating water level in the cooling water supply module 2 rises, and some of the circulating water enters the evaporation and condensation module 1 through the overflow pipe 31 and flows into the evaporator liquid.

[0068] The cooling water circulation pump 21 draws circulating water and pumps it to the liquid flow chamber 41 of the extruder barrel 4. After recycling, the levels of silicon, magnesium, calcium and iron ions in the circulating water are significantly reduced, which reduces the possibility of blockage in the liquid flow chamber 41 of the extruder barrel 4. At the same time, the distilled water is continuously regenerated during the process, which reduces the energy consumption generated by replacing the distilled water and realizes system heat recovery.

[0069] This device effectively recovers and utilizes the waste heat of superheated steam, saving energy. Practice has proven that this device and system effectively utilize waste heat, completely solving the problems of scaling and clogging in plastic extrusion granulation and molding machines (extruder barrels), and producing a continuous supply of distilled water.

[0070] This invention also discloses a method for deionizing extruder circulating water, specifically for removing calcium and magnesium ions from extruder circulating water. This method utilizes the waste heat from superheated steam generated during the extruder barrel cooling process to remove calcium and magnesium ions from the circulating water. The method includes...

[0071] Step 1: The superheated steam from the extruder enters the hollow part 111 inside the heat exchange component 11 from the superheated steam outlet 44, and the superheated steam exchanges heat with the evaporating liquid.

[0072] Step 2: Superheated steam is condensed to form the first condensate, and the evaporating liquid evaporates through heat exchange to form regular steam. The regular steam comes into contact with the metal cover 3 and condenses to form the second condensate. The first condensate and the second condensate flow into the cooling water supply module 2, and the liquid level in the cooling water supply module 2 rises.

[0073] Step 3: The liquid level in the cooling water supply module 2 rises to the predetermined value and overflows into the evaporation and condensation module 1. The cooling water circulation pump 21 delivers circulating water to the cooling water inlet 42 of the extruder barrel 4.

[0074] In the cycle of steps 1 to 3, the waste heat of superheated steam generates first and second condensate, which then reduces the content of calcium, magnesium, silicon, and iron ions in the cooling water tank 22 through the overflow pipe, leaving calcium and magnesium ions in the evaporator 12. The entire cycle process effectively recovers and utilizes the waste heat of superheated steam, reduces the demand for external cooling water, and saves energy. Practice has proven that this device, system, and method effectively utilize waste heat, completely solves the problem of scaling and clogging in the cylinder of plastic extrusion granulation and molding machines, and has certain expected economic benefits.

[0075] The method of this invention has been described through preferred embodiments. Those skilled in the art will readily be able to modify or appropriately alter and combine the methods and applications described herein within the scope, spirit, and content of this invention to implement and apply the technology of this invention. Those skilled in the art can refer to the content herein to appropriately improve process parameters. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included within the scope of this invention.

Claims

1. An extruder circulating water deionization and anti-clogging device, used for reusing and desalinating the circulating water of an extruder, characterized in that, include: An evaporation and condensation module (1) contains an evaporating liquid; the evaporation and condensation module (1) includes a heat exchange component (11), at least a portion of which is immersed in the evaporating liquid, and the heat exchange component (11) has a hollow part (111) inside, which is used to contain superheated steam delivered from the extruder; Cooling water supply module (2), the cooling water supply module (2) includes a cooling water circulation pump (21), the inlet pipe of the cooling water circulation pump (21) extends into the cooling water tank (22), the cooling water circulation pump (21) is used to supply circulating water to the extruder; A metal cap (3) is used to condense the conventional vapor generated by the evaporating liquid; An overflow pipe (31) is provided between the cooling water supply module (2) and the evaporation and condensation module (1). In the first state, the superheated steam enters the hollow part (111), and the superheated steam condenses to form the first condensate; the evaporating liquid evaporates to form the conventional steam, and the conventional steam condenses through the metal cover (3) to form the second condensate; the first condensate and the second condensate flow together into the circulating water of the cooling water supply module (2); In the first state, the level of the circulating water in the cooling water tank (22) rises, and part of the circulating water enters the evaporation and condensation module (1) through the overflow pipe (31) and flows into the evaporation liquid; The evaporation and condensation module (1) also includes an evaporation box (12), one end of which is provided with an opening. The heat exchange component (11) and the evaporating liquid are placed together in the evaporation box (12). The heat exchange component (11) introduces the superheated steam of the extruder through the superheated steam pipe (13). Along the steam flow direction, the superheated steam pipe (13) connects several heat exchange components (11). The extruder circulating water deionization and anti-clogging device includes a first microcontroller module (5) and a first solenoid valve (15); the evaporator (12) has a water inlet pipe, and the first solenoid valve (15) is located at the water inlet pipe; a liquid level device (16) is provided inside the evaporator (12), and the liquid level device (16) is signal-connected to the first microcontroller module (5). The first microcontroller module (5) is used to receive the signal from the liquid level device (16) to control the opening and closing of the first solenoid valve (15).

2. The extruder circulating water deionization and anti-clogging device according to claim 1, characterized in that, The cooling water tank (22) has an opening at one end, and the metal cover (3) is located above the opening of the evaporator (12) and the cooling water tank (22). In the vertical direction, the projection area of ​​the evaporator (12) is within the projection area of ​​the metal cover (3). The metal cover (3) gradually approaches the cooling water tank (22) in the vertical direction from the evaporator (12) to the cooling water tank (22). The overflow pipe (31) connects the cooling water tank (22) and the evaporator (12). In the first state, after the evaporating liquid evaporates, it forms steam. The steam comes into contact with the metal cover (3) and generates the second condensate. The second condensate flows along the metal cover (3) toward the cooling water tank (22) and drips into the cooling water tank (22).

3. The extruder circulating water deionization and anti-clogging device according to claim 1, characterized in that, The heat exchange component (11) is a regular or irregular hollow polygonal box (113), or the heat exchange component (11) is a hollow cylinder, or the heat exchange component (11) is a metal coil (114).

4. The extruder circulating water deionization and anti-clogging device according to claim 3, characterized in that, The heat exchange component (11) has several fins (112) fixedly inserted into its wall.

5. The extruder circulating water deionization and anti-clogging device according to claim 1, characterized in that, The cooling water tank (22) is provided with a cooling coil (221), which is used to reduce the temperature of the cooling water tank (22), and / or the cooling coil (221) is detachably connected to the cooling water tank (22).

6. The extruder circulating water deionization and anti-clogging device according to claim 1, characterized in that, The cooling water tank (22) is equipped with a temperature sensor (222), and the inlet of the cooling coil (221) is equipped with a second solenoid valve (223). The temperature sensor (222) is connected to the first microcontroller module (5) by signal. The first microcontroller module (5) is used to receive the signal from the temperature sensor (222) to control the opening and closing of the second solenoid valve (223).

7. A waste heat recovery system for an extruder, characterized in that, include, The extruder circulating water deionization and anti-clogging device according to any one of claims 1 to 6 is provided with a third solenoid valve (213) on the cooling water circulating pump outlet pipe (212). An extruder, comprising an extruder barrel (4) and a second microcontroller module (8), wherein the extruder barrel (4) is equipped with a temperature sensor, the temperature sensor being signal-connected to the second microcontroller module (8), the second microcontroller module (8) being used to control the opening and closing of the third solenoid valve (213). In the first state, the second microcontroller module (8) controls the third solenoid valve (213) to open, and the cooling water circulation pump (21) pumps circulating water to the extruder barrel (4). The circulating water evaporates into superheated steam through the extruder barrel (4), and the superheated steam enters the hollow part (111). The superheated steam undergoes heat conduction with the evaporated liquid. The superheated steam condenses to form the first condensate; the evaporating liquid evaporates to form regular steam, and the regular steam condenses through the metal cover (3) to form the second condensate. The first condensate and the second condensate flow together into the circulating water of the cooling water supply module (2) to reduce the calcium, magnesium and silicon ion content of the circulating water. In the first state, the circulating water level in the cooling water supply module (2) rises, and part of the circulating water enters the evaporation and condensation module (1) through the overflow pipe (31) and flows into the evaporator.

8. A method for utilizing waste heat from extruder circulating water, using the extruder circulating water deionization and anti-clogging device according to any one of claims 1 to 7, characterized in that, include, Step 1: The superheated steam from the extruder enters the hollow part (111) inside the heat exchange component (11), where the superheated steam exchanges heat with the evaporating liquid; Step 2: The superheated steam is condensed to form the first condensate, and the evaporating liquid is evaporated through heat exchange to form conventional steam. The conventional steam contacts the metal cover (3) and condenses to form the second condensate. The first condensate and the second condensate flow into the cooling water supply module (2), and the liquid level in the cooling water supply module (2) rises. Step 3: The liquid level in the cooling water supply module (2) rises to a predetermined value and overflows into the evaporation and condensation module (1). The cooling water circulation pump (21) pumps circulating water to the extruder.

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