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

Abstract

The utility model relates to the field of plastic extrusion granulation and forming machines, and particularly discloses an extruder circulating water ion removal anti-blocking device, a waste heat utilization system and a waste heat utilization method. Waste heat generated in the machine barrel cooling process is utilized to generate distilled water in the evaporation condensation module, the distilled water enters the cooling water tank, circulating water in the cooling water tank does not contain calcium, magnesium, iron and other ions, and the problems of scaling and blocking of a barrel cooling flow channel are thoroughly solved. According to the device, waste heat of superheated steam is effectively recycled, the quantity demanded of external cooling water is reduced, energy is saved, practice proves that the device, the system and the method effectively utilize the waste heat, the problems of scaling and blocking of a barrel in the field of plastic extrusion granulation and forming machines are thoroughly solved, and certain expected economic benefits are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of plastic extrusion granulation, molding machine, specifically discloses a kind of extruder circulating water ion removal anti-blocking device, waste heat utilization system. BACKGROUND

[0002] Extruder is a kind of equipment for plastic processing, by heating and melting plastic raw materials (such as granules, powder or reclaimed material), and under certain pressure and temperature, through the extrusion process of special-shaped die, produce various mechanical equipment of plastic products, which is applied to the production of pipe, profile, plate, pipeline and other products, wherein, during the extrusion process, the cylinder needs to be heated, the cylinder heating is to heat the plastic raw materials to a sufficient temperature, so that it enters the flow state, facilitating the pushing and mixing of screw. Reasonable heating control can ensure that the material reaches the appropriate melting degree, avoid overheating or uneven heating caused by product quality problems, so the cylinder is equipped with a thermocouple, and a liquid flow cavity is also arranged inside. Circulating water is pumped into the liquid flow cavity, and the circulating water is gasified into superheated steam in the liquid flow cavity. In order to uniformly control the temperature of the cylinder, the cross-sectional size of the liquid flow cavity needs to be controlled. The circulating liquid flows in the liquid flow cavity and evaporates to form superheated steam. In this process, salt deposits mainly composed of calcium, silicon, magnesium and iron are formed in the liquid flow cavity. Since the cylinder is made of metal material, and the cross-sectional size of the liquid flow cavity is not large, the cylinder surrounds the liquid flow cavity in unit volume, which leads to difficult cleaning and blocking of the cylinder. CONTENT OF THE UTILITY MODEL

[0003] In view of the prior art, the utility model discloses a first aspect of a kind of extruder circulating water ion removal anti-blocking device, for the recycling and removing calcium, magnesium and other salt ions of the circulating water of extruder, to completely solve the problem of blocking of liquid flow cavity in the cylinder of extruder, comprising:

[0004] Evaporation condensation module, inside containing evaporation liquid, the evaporation condensation module includes heat exchange component, at least a part of the heat exchange component is immersed in the evaporation liquid, and the heat exchange component is provided with hollow portion, and the hollow portion is used to accommodate the superheated steam conveyed by the extruder;

[0005] Cooling water supply module, the cooling water supply module includes cooling water circulating pump, and the inlet pipe of the cooling water circulating pump is inserted into cooling water tank, and the cooling water circulating pump is used to provide circulating water to the extruder;

[0006] Condensing mechanism, the condensing mechanism is used to condense the second steam generated by the evaporation liquid;

[0007] Overflow pipe is arranged between the cooling water supply module and the evaporation condensation module;

[0008] In the first state, the superheated steam enters the hollow part, and the superheated steam is condensed to form first condensed water; the evaporation liquid is evaporated to form the second steam, and the second steam is condensed by the condensing mechanism to form second condensed water; and the first condensed water and the second condensed water are jointly poured into the circulating water of the cooling water supply module.

[0009] In the first state, the liquid 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 is poured into the evaporation liquid.

[0010] In some first aspect embodiments of the present application, the evaporation and condensation module further comprises an evaporation tank, one end of the evaporation tank is provided with an opening, the heat exchange assembly and the evaporation liquid are jointly arranged in the evaporation tank, the heat exchange assembly introduces the superheated steam of the extruder through a superheated steam pipe, and the superheated steam pipe is connected to the heat exchange assembly along the steam flow direction.

[0011] In some first aspect embodiments of the present application, one end of the cooling water tank is provided with an opening, the condensing mechanism comprises a metal plate, the metal plate is arranged above the opening of the evaporation tank and the cooling water tank, in the vertical direction, the projection area of the evaporation tank is within the projection area of the metal plate; the metal plate gradually approaches the cooling water tank in the vertical direction from the evaporation tank to the cooling water tank, and the overflow pipe is connected to the cooling water tank and the evaporation tank.

[0012] In the first state, the evaporation liquid is evaporated to form steam, the steam contacts the metal plate to generate the second condensed water, and the second condensed water flows along the metal plate to the cooling water tank and then drops into the cooling water tank.

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

[0014] In some first aspect embodiments of the present application, fins are fixedly arranged on the wall surface of the heat exchange assembly.

[0015] In some first aspect embodiments of the present application, the heat exchange assembly and the evaporation tank are detachably connected.

[0016] In some first aspect embodiments of the utility model, the extruder circulating water ion removal anti -blocking device includes first micro control module and first electromagnetic valve, the evaporative tank has water inlet pipe, first electromagnetic valve is arranged at water inlet pipe, liquid level device is arranged in evaporative tank, liquid level device is connected with first micro control module signal, first micro control module is used to accept the signal of liquid level device to control first electromagnetic valve opening and closing.

[0017] In some first aspect embodiments of the utility model, cooling coil is arranged in cooling water tank, and the cooling coil is used to reduce the temperature of the cooling water tank.

[0018] In some first aspect embodiments of the utility model, cooling water tank is provided with temperature sensor, and the water inlet of cooling coil is provided with second electromagnetic valve, the temperature sensor is connected with first micro control module signal, and the first micro control module is used to accept the signal of temperature sensor to control the opening and closing of second electromagnetic valve.

[0019] The second aspect of the utility model proposes a circulating water waste heat utilization system comprising the device of the first aspect, comprising,

[0020] The extruder circulating water ion removal anti-blocking device of any of the first aspect, the outlet pipe of cooling water circulating pump is provided with third electromagnetic valve;

[0021] The extruder comprises an extruder barrel and a second micro control module, the extruder barrel is provided with a temperature control sensor, the temperature control sensor is connected with the second micro control module signal, and the second micro control module is used to control the opening and closing of the third electromagnetic valve,

[0022] In the first state, the second micro control module controls the third electromagnetic valve to open, the cooling water circulating pump pumps the circulating water to the extruder barrel, the circulating water is evaporated into superheated steam by the action of the extruder barrel, the superheated steam enters the hollow part, and the superheated steam and the evaporation liquid occur heat conduction.

[0023] The superheated steam condenses to form the first condensed water, the evaporation liquid evaporates to form the second steam, the second steam is condensed by the condensing mechanism to form the second condensed water, and the first condensed water and the second condensed water are jointly poured into the circulating water of the cooling water supply module to reduce the amount of calcium, magnesium and other salt ions in the circulating water, thereby solving the problem of blockage of the circulating water liquid flow cavity in the extruder barrel.

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

[0025] In this utility model, the "first microcontroller" and "second microcontroller" can be selected from logic circuits, industrial PLC modules, MCUs (microcontrollers), etc.

[0026] In this invention, the extruder can be called a plastic extruder, a plastic extruder, or a twin-screw extruder granulator.

[0027] Advantages of this utility model:

[0028] This invention utilizes an evaporation-condensation module, heat exchange components, a cooling water supply module, and a condensation mechanism. It employs the 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 solving the problems of scaling and blockage in the barrel's cooling channels. This invention effectively recovers and utilizes the waste heat of superheated steam, reducing the demand for external circulating water (distilled water) and saving energy. Practical experience has proven that this device, system, and method effectively utilize waste heat, completely solving the problems of scaling and blockage in plastic extrusion granulation and molding machine barrels, and demonstrating certain expected economic benefits. Attached Figure Description

[0029] Figure 1 This is a schematic diagram showing the pipeline and equipment connection of the extruder cooling system of this utility model;

[0030] Figure 2 This invention presents a first structural diagram of the extruder circulating water deionization and anti-clogging device.

[0031] Figure 3 This invention relates to a second structural diagram of an extruder circulating water deionization and anti-clogging device, viewed from a first perspective.

[0032] Figure 4 This invention relates to a second structural diagram and a second perspective view of the extruder circulating water deionization and anti-clogging device of this utility model.

[0033] Figure 5 This invention provides a schematic diagram illustrating the generation of the first and second condensates.

[0034] Figure 6 This utility model shows the external structure of the heat exchange component as a housing.

[0035] Figure 7 Show Figure 6 The heat exchange component AA is shown in cross-sectional view.

[0036] Figure 8 This is a first-angle view showing the external structure of multiple boxes connected in series according to this utility model;

[0037] Figure 9 This is a second-angle view showing the external structure of the multiple boxes connected in series according to this utility model;

[0038] Figure 10 Extruder barrel cross-sectional view

[0039] 1, evaporative condensation module; 11, heat exchange assembly; 111, hollow part; 112, fin; 113, box; 114, metal coil; 12, evaporative tank; 13, superheated steam pipe; 131, flange; 15, first electromagnetic valve; 16, liquid level device; 17, steam water tank water supply pipe; 2, cooling water supply module; 21, cooling water circulating pump; 211, cooling water circulating pump water inlet pipe; 212, cooling water circulating pump water outlet pipe; 213, third electromagnetic valve; 214, cooling water circulating pump backflow pipe; 2141, backflow valve; 22, cooling water tank; 221, cooling coil; 222, temperature sensor; 223, second electromagnetic valve; 23, circulating water taking pipe; 3, condensation mechanism; 31, overflow pipe; 4, extruder barrel; 41, liquid flow cavity; 42, cooling water inlet; 43, extrusion channel; 44, superheated steam outlet; 5, first micro-control module; 6, base; 7, blowdown valve; 8, second micro-control module. DETAILED DESCRIPTION

[0040] The utility model is further described below in combination with specific embodiments. It is worth mentioning that these embodiments are only used to illustrate the utility model and do not limit the utility model in any way. Improvements and adjustments made by the skilled person in the actual application according to the utility model still belong to the protection scope of the utility model.

[0041] Please refer to Figures 1 to 5 The utility model provides a kind of extruder circulating water ion removal anti-blocking device, for the recycling and removal of calcium, magnesium and other ions of the circulating water of extruder, to solve the problem of the blockage of liquid flow cavity 41 in extruder barrel 4, further for the waste heat of superheated steam to manufacture circulating water, reduce the calcium magnesium iron ion concentration in water, the device includes:

[0042] Evaporative condensation module 1 contains evaporative liquid inside, which is water, and includes heat exchange assembly 11 and evaporative tank 12. The evaporative tank 12 is open at one end and contains evaporative liquid. At least a portion of the heat exchange assembly 11 is immersed in the evaporative liquid. The heat exchange assembly 11 has a hollow part 111 inside. The superheated steam pipe 13 is connected to the heat exchange assembly 11. The superheated steam pipe 13 is used to deliver superheated steam to the hollow part 111. For example, the superheated steam generated by the extruder barrel 4 is delivered from the G arrow to the heat exchange assembly 11 through the superheated steam pipe 13. The hollow part 111 in the heat exchange assembly 11 is used to accommodate the superheated steam delivered by the extruder.

[0043] The superheated steam in the hollow part 111 of the heat exchange component 11 and the evaporation liquid contacted by the heat exchange component 11 conduct heat, the superheated steam is condensed to form first condensed water, the first condensed water flows into the cooling water supply module 2, i.e. the cooling water tank 22 from the direction of the F1 arrow.

[0044] The cooling water supply module 2 includes a circulating pump 21, the circulating pump inlet pipe 211 extends into the cooling water tank 22 to extract the circulating water in the cooling water tank 22, such as the direction of the F4 arrow, the circulating pump 21 is used to provide circulating water to the extruder barrel 4, such as the direction of the F4a arrow.

[0045] The evaporation liquid evaporates under the action of heat conduction to form second steam, the second steam contacts the condensing mechanism 3 from the direction of the G1 arrow, the condensing mechanism 3 is optionally a metal plate, one side of the metal plate is in contact with the atmosphere, and the other side is in contact with the second steam, the second steam is condensed to produce second condensed water, and the second condensed water is attached to the metal plate.

[0046] As shown in Figure 5 , Figure 5 The upper and lower arrows indicate the vertical direction, one end of the cooling water tank 22 is provided with an opening, the metal plate is placed above the opening of the evaporation tank 12 and the cooling water tank 22, in the vertical direction, the projection area of the evaporation tank 12 is within the projection area of the metal plate; the metal plate gradually approaches the cooling water tank 22 in the vertical direction from the evaporation tank 12 to the cooling water tank 22, and the condensed water attached to the metal plate collects above the cooling water tank 22 and drips into the cooling water tank 22, such as the direction of the F2 arrow.

[0047] The overflow pipe 31 connects the cooling water tank 22 and the evaporation tank 12.

[0048] In the first state, i.e. the running state of the device, the superheated steam enters the hollow part 111, the superheated steam is condensed to form first condensed water, the evaporation liquid is evaporated to form second steam, the second steam is condensed by the condensing mechanism 3, such as a metal plate, to form second condensed water, and the first condensed water and the second condensed water are jointly poured into the circulating water of the cooling water supply module 2, and further into the cooling water tank 22.

[0049] In the first state, the liquid level of the circulating water in the cooling water tank 22 rises, part of the circulating water enters the evaporation and condensation module 1 through the overflow pipe 31, and further enters the evaporation tank 12, such as the direction of the F3 arrow, the part of the circulating water is poured into the evaporation liquid, and the calcium, magnesium, silicon, iron and other salt ions in the cooling water tank 22 are brought into the evaporation tank 12.

[0050] In some optional embodiments, the heat exchange component 11 introduces the extruder superheated steam through the superheated steam pipe 13, and the superheated steam pipe 13 communicates a plurality of heat exchange components 11 along the steam flow direction.

[0051] AsFigures 6 to 9 Preferably, in order to further increase the heat exchange efficiency, the heat exchange assembly 11 is a regular or irregular hollow polygonal box 113, or the heat exchange assembly 11 is a hollow cylinder, or the heat exchange assembly 11 is a metal coil pipe 114.

[0052] Preferably, the wall surface of the heat exchange assembly 11 is fixedly provided with a plurality of fins 112.

[0053] In some optional embodiments, the heat exchange assembly 11 is detachably connected with the evaporation tank 12, for example, the metal coil pipe 114 and the evaporation tank 12 are connected through a flange 131. When excessive scaling of calcium, magnesium and the like occurs in the tank, the flange 131 is detached to easily clean the internal environment of the evaporation tank 12.

[0054] In some optional embodiments, a cooling coil pipe 221 is placed in the cooling water tank 22, the cooling coil pipe 221 is used to reduce the temperature of the cooling water tank 22, the water inlet of the cooling coil pipe 221 is connected with a water source under pressure, for example, municipal tap water, the flow of water in the cooling coil pipe 221 is controlled through a second electromagnetic valve 223, the second electromagnetic valve 223 is signal connected with the first micro control module 5, the cooling water tank 22 is also provided with a temperature sensor 222, the temperature sensor 222 is signal connected with the first micro control module 5, and signals are transmitted to the first micro control module 5 to control the opening and closing of the second electromagnetic valve 223, thereby controlling the flow of water in the cooling coil pipe 221, and the direction of the flow of water in the cooling coil pipe 221 is as shown in F6.

[0055] In some embodiments, the ion removal and anti-blocking device of the extruder circulating water further comprises a first micro control module 5 and a first electromagnetic valve 15, the evaporation tank 12 is provided with a water inlet pipe, and the first electromagnetic valve 15 is arranged at the water inlet pipe; the evaporation tank 12 is provided with a liquid level device 16, the liquid level device 16 is signal connected with the first micro control module 5, and the first micro control module 5 is used to receive signals of the liquid level device 16 to control the opening and closing of the first electromagnetic valve 15, thereby controlling the water under pressure such as tap water to enter the evaporation tank 12, so that the liquid level in the evaporation tank 12 is not too low, for example, in the direction of the arrow F7, and the evaporation tank 12 is watered, so that the amount of circulating water in the cooling water tank 22 is increased during the circulation, the electrical conductivity of the circulating water is reduced, and the problem of blockage of the liquid flow cavity 41 in the extruder barrel 4 is solved. The system utilizes waste heat to generate certain economic benefits.

[0056] In some embodiments, the circulating pump 21 is operated for a long time, and the circulating pump outlet pipe 212 is further connected with a circulating pump return pipe 214, the circulating pump return pipe 214 is provided with a return valve 2141, which can be a ball valve, a butterfly valve or the like. In the first state, the circulating pump 21 pumps circulating water to the extruder, as shown by the arrow F4a, and another part of the circulating liquid returns to the cooling water tank 22 through the circulating pump return pipe 214, as shown by the arrow F4b. In the case that the circulating pump outlet pipe 212 is not smooth, the pressure is too large, which may cause damage to the equipment.

[0057] In some embodiments, the wall panels of the evaporation tank 12 are also covered with thermal insulation material, which can be selected from the group consisting of asbestos, ceramic fiber, graphite felt, aluminum silicate, aerogel insulation, and polymer foam resin insulation.

[0058] In some embodiments, the evaporation tank 12 and the cooling water tank 22 are also provided with a blowdown valve, wherein the blowdown valve 7 provided in the evaporation tank 12 is used to discharge water containing high levels of calcium, magnesium, silicon, iron, and other salt ions, as indicated by the arrow F5.

[0059] As shown in Figure 1 The utility model provides a kind of extruder circulating water waste heat utilization system, including, the extruder circulating water ion removal anti-blocking device of any one of the embodiment proposed by the utility model, third solenoid valve 213 is installed in cooling water circulating pump outlet pipe 212, for control cooling water circulating pump 21 to the flow of circulating water that is pumped to extruder, third solenoid valve 213 is connected with second microcontrol module 8 signal.

[0060] Second microcontrol module 8 is connected with temperature control sensor signal embedded in extruder barrel 4 simultaneously, second microcontrol module 8 controls third solenoid valve 213 according to temperature control sensor signal, and opens and closes opening degree,

[0061] In first state, second microcontrol module 8 controls third solenoid valve 213 to open, and circulating pump 21 pumps circulating water to extruder barrel 4, and circulating water is absorbed heat after passing through the liquid flow cavity 41 of extruder barrel 4, and is evaporated into superheated steam, which enters hollow part 111 from superheated steam pipe 13, and in hollow part 111, the superheated steam is in thermal conduction with evaporation liquid,

[0062] Superheated steam is condensed to form first condensed water, which enters cooling water tank 22 from F1 arrow, and second steam is formed after evaporation liquid is evaporated, and second steam is condensed by condensing mechanism 3, such as metal plate, to form second condensed water, and first condensed water and second condensed water are jointly poured into circulating water in cooling water tank 22, and circulating water level is raised, and is poured into evaporation tank 12 from overflow pipe 31, so that the amount of calcium, magnesium and other ions in circulating water is reduced.

[0063] In first state, the circulating water level in cooling water supply module 2 is raised, and part of the circulating water enters evaporation and condensation module 1 through overflow pipe 31 and is poured into evaporation liquid.

[0064] Cooling water circulating pump 21 extracts circulating water and pumps it to the liquid flow cavity 41 of extruder barrel 4, and through reuse circulation, the amount of silicon, magnesium, calcium and iron salt in circulating water is significantly reduced, which reduces the possibility of blockage of the liquid flow cavity 41 of extruder barrel 4, and in the process, distilled water is continuously regenerated, which reduces the energy consumption generated by replacing distilled water, and realizes system heat recovery.

[0065] The device effectively recycles waste heat of superheated steam, saves energy, and practice proves that the device, system and method effectively utilize waste heat, completely solve the problems of scaling and blocking of the plastic extrusion granulator and the forming machine (extruder barrel), and generate continuous distilled water.

[0066] The utility model discloses still a kind of method of using extruder circulating water deionization, namely to extruder circulating water desalination (calcium, magnesium and other ions), namely the method of using the superheated steam waste heat generated during extruder barrel cooling process to remove calcium, magnesium and other ions from circulating water, comprising,

[0067] Step 1: the superheated steam of the extruder enters the hollow part 111 of the heat exchange assembly 11 from the superheated steam outlet 44, and the superheated steam exchanges heat with the evaporation liquid;

[0068] Step 2: the superheated steam is condensed to form first condensed water, and the evaporation liquid is evaporated to form second steam through heat exchange, and the second steam is condensed by the condensing mechanism 3 to form second condensed water; the first condensed water and the second condensed water are jointly fed into the cooling water supply module 2, and the liquid level in the cooling water supply module 2 rises;

[0069] Step 3: the liquid level in the cooling water supply module 2 rises to a predetermined value, and overflows to the evaporation and condensation module 1; the cooling water circulating pump 21 delivers circulating water to the cooling water inlet 42 of the extruder barrel 4.

[0070] In the circulation of steps 1 to 3, the superheated steam waste heat generates first condensed water and second condensed water, and the calcium, magnesium and silicon iron ion content in the cooling water tank 22 is reduced through the overflow pipe, leaving the salt ions in the evaporation tank 12. The entire circulation process effectively recycles waste heat of superheated steam, reduces the demand for external cooling water, saves energy, and practice proves that the device, system and method effectively utilize waste heat, completely solve the problems of scaling and blocking of the plastic extrusion granulator and the forming machine barrel, and have certain expected economic benefits.

[0071] The method of the utility model has been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application of the present text within the content, spirit and scope of the utility model to realize and apply the utility model technology. Those skilled in the art can refer to the content of the present text to appropriately improve process parameters. It is particularly important to note that all similar replacements and modifications are obvious to those skilled in the art, and they are considered to be included in the utility model.

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-condensation module (1) contains an evaporating liquid; the evaporation-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 section (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 condensing mechanism (3) is used to condense the second 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 second steam, and the second steam is condensed by the condensing mechanism (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.

2. The extruder circulating water deionization and anti-clogging device according to claim 1, characterized in that, 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 of the heat exchange components (11).

3. The extruder circulating water deionization and anti-clogging device according to claim 2, characterized in that, The cooling water tank (22) has an opening at one end. The condensation mechanism (3) includes a metal plate. The metal plate is positioned above the openings 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 plate. The metal plate 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 contacts the metal plate and generates the second condensate. The second condensate flows along the metal plate toward the cooling water tank (22) and drips into the cooling water tank (22).

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

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

6. The extruder circulating water deionization and anti-clogging device according to any one of claims 2 to 5, characterized in that, The heat exchange assembly (11) is detachably connected to the evaporator (12).

7. The extruder circulating water deionization and anti-clogging device according to any one of claims 2 or 3, characterized in that, 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).

8. The extruder circulating water deionization and anti-clogging device according to claim 7, 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).

9. The extruder circulating water deionization and anti-clogging device according to claim 8, 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) for receiving the signal from the temperature sensor (222) to control the opening and closing of the second solenoid valve (223).

10. A waste heat recovery system for extruder circulating water, characterized in that, include, The extruder circulating water deionization and anti-clogging device according to any one of claims 1 to 9 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 the second steam, which is condensed by the condensing mechanism (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 amount of calcium, magnesium and silicon salt ions in 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.

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