Steam condensation reflux and collection device of double-screw extruder

Abstract

The utility model discloses a steam condensation reflux and collection device of a double-screw extruder. The device comprises a precooler, a first condensation mechanism, a second condensation mechanism, a filter, a liquid collector, a liquid purity detection system and a recovery liquid storage tank, one end of the precooler is used for being connected with an exhaust hole of the extruder, and the other end of the precooler is connected with the filter through a pipeline; the first condensation mechanism is arranged on a pipeline source; the second condensation mechanism is arranged at the peripheral source of the pipeline and is positioned between the first condensation mechanism and the filter; the filter is connected with one end of the liquid collector; the other end of the liquid collector is connected with one end of the liquid purity detection system; the other end of the liquid purity detection system is connected with one end of the recovery liquid storage tank; and the other end of the recovery liquid storage tank is connected with a liquid pump of the extruder. According to the utility model, the production cost is effectively reduced, the economic benefit is created, the waste gas emission is reduced, and the concept of green development nowadays is better met.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam condensation backflow technical field, especially in kind of double screw extruder steam condensation backflow and collection device. BACKGROUND

[0002] In the preparation process of the master batch, part of the functional additives can be added to the appropriate solvent to configure a solution, which is injected into the screw extruder through a liquid pump. The additive solution is uniformly mixed with the polymer matrix inside the extruder. In this process, the solvent volatilizes in a high-temperature environment and is removed by the suction system together with water vapor and a small amount of powder, and finally discharged as exhaust gas from the exhaust port. This production method greatly shortens the effective use period of the solvent, not only causing waste of resources, but also causing pollution to the atmospheric environment on the basis of increasing economic costs. How to effectively collect and recycle the solvent in the exhaust gas of the screw extruder, while creating a circular economy and reducing pollution, has become a real problem that needs to be solved. SUMMARY

[0003] Based on the above problems existing in the prior art, the purpose of the embodiments of the present application is to provide a double screw extruder steam condensation backflow and collection device. The solvent vapor discharged by the double screw extruder is converted into solvent liquid by condensation backflow through this recycling treatment device, which is uniformly purified and collected for recycling, used to configure new additive solution for re-injection into the liquid pump for production. This not only effectively reduces production costs and creates economic benefits, but also reduces exhaust gas emissions, which is more in line with the concept of green development today.

[0004] The technical scheme adopted by the present application to solve its technical problems is: a double screw extruder steam condensation backflow and collection device, comprising a pre-cooler, a first condensing mechanism, a second condensing mechanism, a filter, a liquid collector, a liquid purity detection system and a recovery liquid tank.

[0005] One end of the pre-cooler is connected to the exhaust port of the extruder, and the other end of the pre-cooler is connected to the filter through a pipeline; the first condensing mechanism is arranged around the pipeline; the second condensing mechanism is arranged around the pipeline, and the second condensing mechanism is located between the first condensing mechanism and the filter; the filter is connected to one end of the liquid collector; the other end of the liquid collector is connected to one end of the liquid purity detection system; the other end of the liquid purity detection system is connected to one end of the recovery liquid tank; the other end of the recovery liquid tank is used to connect the liquid pump of the extruder.

[0006] Further, the pre-cooler is connected to the exhaust port of the extruder through a first connecting pipe, and a pressure gauge and a diaphragm valve are arranged on the first connecting pipe.

[0007] Furthermore, the first condensation mechanism includes a primary condenser tube and a first electric valve. The primary condenser tube is wound around the periphery of the pipeline, and the first electric valve is mounted on the primary condenser tube.

[0008] Furthermore, the second condensation mechanism includes a secondary condenser tube and a second electric valve. The secondary condenser tube is wound around the periphery of the pipeline, and the second electric valve is mounted on the secondary condenser tube.

[0009] Furthermore, a waste liquid collection tank and an adsorption tank are installed on the pipeline. The waste liquid collection tank is located between the first condensation mechanism and the second condensation mechanism, and the adsorption tank is located between the second condensation mechanism and the filter.

[0010] Furthermore, a first temperature sensor and a second temperature sensor are installed on the pipeline. The first temperature sensor is located between the first condensation mechanism and the second condensation mechanism, and the second temperature sensor is located between the second condensation mechanism and the filter.

[0011] Furthermore, the liquid purity detection system is connected to the recovery storage tank via a second connecting pipe, on which a vacuum pump is installed.

[0012] The beneficial effects of this application are as follows: This utility model deeply condenses mixed vapor containing a large amount of solvent through pre-cooling, condensation reflux, temperature control, filtration, collection, separation, and storage. By controlling the temperature slightly below the boiling point of the solvent vapor, the solvent in the mixed vapor is initially purified, ensuring that most of the solvent is condensed and separated from the gas phase. The separated liquid is tested for purity. The qualified liquid is stored in a recovery storage tank for reuse as a solvent in the production process. The unqualified solvent is purified and then reused. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the steam condensation, reflux, and collection device for the twin-screw extruder in this application.

[0014] Explanation of reference numerals in the attached figures

[0015] Precooler 1, Pipeline 11, Waste liquid collection tank 111, Adsorption tank 112, First temperature sensor 113, Second temperature sensor 114, First connecting pipe 12, Pressure gauge 121, Diaphragm valve 122, First condensing mechanism 2, First stage condenser 21, First electric valve 22, Second condensing mechanism 3, Second stage condenser 31, Second electric valve 32, Filter 4, Liquid collector 5, Liquid purity detection system 6, Second connecting pipe 61, Vacuum pump 611, Recovery storage tank 7, Extruder 10, Exhaust port 101, Liquid pump 102. Detailed Implementation

[0016] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 As shown, this utility model discloses a steam condensation and reflux collection device for a twin-screw extruder, comprising a precooler 1, a first condensation mechanism 2, a second condensation mechanism 3, a filter 4, a liquid collector 5, a liquid purity detection system 6, and a recovery storage tank 7. One end of the precooler 1 is connected to the exhaust port 101 of the extruder 10, and the other end of the precooler 1 is connected to the filter 4 via a pipe 11. The first condensation mechanism 2 is disposed around the pipe 11. The second condensation mechanism 3 is disposed around the pipe 11 and is located between the first condensation mechanism 2 and the filter 4. The filter 4 is connected to one end of the liquid collector 5. The other end of the liquid collector 5 is connected to one end of the liquid purity detection system 6. The other end of the liquid purity detection system 6 is connected to one end of the recovery storage tank 7. The other end of the recovery storage tank 7 is used to connect to the liquid pump 102 of the extruder 10.

[0018] Thus, this utility model relates to a steam condensation, reflux, and collection device for a twin-screw extruder. Through pre-cooling, condensation, reflux, filtration, collection, separation, and storage, this utility model deeply condenses mixed steam containing a large amount of solvent. By controlling the temperature slightly below the boiling point of the solvent vapor, the solvent in the mixed steam is initially purified, ensuring that most of the solvent condenses and separates from the gas phase. The separated liquid undergoes purity testing. Liquid that passes the test is stored in a recovery storage tank 7 for reuse as a solvent in the production process. Solvents that fail the test are purified and then recycled. In other words, solvents that fail the test are purified and then fed back into the recovery storage tank 7 for reuse.

[0019] Optionally, the precooler 1 is connected to the exhaust port 101 of the extruder 10 via a first connecting pipe 12. A pressure gauge 121 and a diaphragm valve 122 are installed on the first connecting pipe 12. By installing the pressure gauge 121, the pressure of the steam in the first connecting pipe 12 can be monitored, and by installing the diaphragm valve 122, the steam delivery can be easily turned on or off.

[0020] In this embodiment, the first condensation mechanism 2 includes a primary condenser tube 21 and a first electric valve 22. The primary condenser tube 21 is wound around the pipe 11, and the first electric valve 22 is mounted on the primary condenser tube 21. In use, cooling water can be introduced into the primary condenser tube 21 to achieve condensation. When steam passes through the primary condenser tube 21, the steam condenses at a temperature slightly higher than the boiling point of the solvent, removing steam impurities with boiling points higher than the solvent by condensing them into liquid. The first electric valve 22 facilitates the opening or closing of the cooling water supply.

[0021] Furthermore, the second condensation mechanism 3 includes a secondary condenser tube 31 and a second electric valve 32. The secondary condenser tube 31 is wound around the pipe 11, and the second electric valve 32 is mounted on the secondary condenser tube 31. In use, cooling water can be introduced into the secondary condenser tube 31 to achieve condensation. When the remaining steam passes through the secondary condenser tube 31, the remaining uncondensed mixed steam flows into the secondary condenser tube 31 at a temperature slightly lower than the boiling point of the solvent for deep condensation, ensuring that most of the solvent is condensed and separated from the gas phase.

[0022] In this embodiment, a waste liquid collection tank 111 and an adsorption tank 112 are installed on the pipeline 11. The waste liquid collection tank 111 is located between the first condensation mechanism 2 and the second condensation mechanism 3, and the adsorption tank 112 is located between the second condensation mechanism 3 and the filter 4. By setting up the waste liquid collection tank 111, when steam passes through the first-stage condenser 21, the steam is condensed at a temperature slightly higher than the boiling point of the solvent. The steam impurities with boiling points higher than the solvent are condensed into liquid, and this liquid enters the waste liquid collection tank 111, thereby removing the steam impurities with boiling points higher than the solvent. By setting up the adsorption tank 112, the remaining uncondensed mixed steam flows into the second-stage condenser 31 at a temperature slightly lower than the boiling point of the solvent for deep condensation. The remaining low-boiling-point steam impurities enter the adsorption tank 112, thereby removing the remaining low-boiling-point steam impurities.

[0023] Furthermore, a first temperature sensor 113 and a second temperature sensor 114 are provided on the pipe 11. The first temperature sensor 113 is located between the first condensing mechanism 2 and the second condensing mechanism 3, and the second temperature sensor 114 is located between the second condensing mechanism 3 and the filter 4. By setting the first temperature sensor 113 and the second temperature sensor 114, it is convenient to detect the temperature and achieve temperature control.

[0024] In this embodiment, the liquid purity detection system 6 and the recovery storage tank 7 are connected by a second connecting pipe 61, and a vacuum pump 611 is installed on the second connecting pipe 61. The introduction of this vacuum pump 611 can reduce the pressure inside the condenser tube, further promote the condensation of the solvent, and improve the recovery efficiency.

[0025] In summary, the steam from the extruder 10 of this invention is first introduced into the precooler 1, where the temperature is lowered, causing the mixed steam to begin condensing. It then enters the primary condenser 21, where it is condensed at a temperature slightly above the solvent's boiling point, removing steam impurities with boiling points higher than the solvent by condensing them into liquid. Next, the remaining uncondensed mixed steam flows into the secondary condenser 31 at a temperature slightly below the solvent's boiling point for deep condensation, ensuring that most of the solvent is condensed and separated from the gas phase. The remaining low-boiling-point steam impurities enter the adsorption device, where toxic gases are removed before being discharged through the exhaust pipe. The condensed mixture passes through the filter 4 to remove any possible solid impurities, protecting downstream equipment from damage. The collector 5 then effectively collects the solvent, which is sent to the liquid purity detection system 6. The detection process effectively determines whether the collected solvent is directly usable. The introduction of the vacuum pump 611 reduces the pressure inside the condenser, further promoting solvent condensation and improving recovery efficiency. The separated solvent is stored in the recovery storage tank 7 and can be directly reused in the production process, achieving resource recycling. This invention improves resource recycling rates, enabling the recycling of solvents during the production process and creating economic value. The purified solvent can be used directly, reducing the burden on enterprises for waste liquid and waste gas treatment. It also reduces emissions of waste gas and pollutants, thus lowering environmental pollution.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A steam condensation and reflux collection device for a screw extruder, characterized in that: It includes a precooler, a first condenser, a second condenser, a filter, a liquid collector, a liquid purity detection system, and a recovery storage tank; One end of the precooler is connected to the exhaust port of the extruder, and the other end of the precooler is connected to the filter through a pipe; the first condensing mechanism is located around the pipe; the second condensing mechanism is located around the pipe and is situated between the first condensing mechanism and the filter. The filter is connected to one end of the liquid collector; the other end of the liquid collector is connected to one end of the liquid purity detection system; the other end of the liquid purity detection system is connected to one end of the recovery storage tank; the other end of the recovery storage tank is used to connect to the liquid pump of the extruder.

2. The steam condensation and collection device for a screw extruder as described in claim 1, characterized in that: The precooler is connected to the exhaust port of the extruder via a first connecting pipe, which is equipped with a pressure gauge and a diaphragm valve.

3. The screw extruder steam condensation reflux and collection device as described in claim 1, characterized in that: The first condensation mechanism includes a primary condenser tube and a first electric valve. The primary condenser tube is wound around the periphery of the pipeline, and the first electric valve is installed on the primary condenser tube.

4. The screw extruder steam condensation reflux and collection device as described in claim 1, characterized in that: The second condensation mechanism includes a secondary condenser tube and a second electric valve. The secondary condenser tube is wound around the periphery of the pipeline, and the second electric valve is installed on the secondary condenser tube.

5. The screw extruder steam condensation reflux and collection device as described in claim 1, characterized in that: Waste liquid collection tank and adsorption tank are installed on the pipeline. The waste liquid collection tank is located between the first condensation mechanism and the second condensation mechanism, and the adsorption tank is located between the second condensation mechanism and the filter.

6. The steam condensation and collection device for a screw extruder as described in claim 1, characterized in that: The pipeline is equipped with a first temperature sensor and a second temperature sensor. The first temperature sensor is located between the first condensing mechanism and the second condensing mechanism, and the second temperature sensor is located between the second condensing mechanism and the filter.

7. The screw extruder steam condensation reflux and collection device as described in claim 1, characterized in that: The liquid purity detection system is connected to the recovery storage tank via a second connecting pipe, on which a vacuum pump is installed.

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