Device and method for drying and upgrading polymer glue

Abstract

The invention discloses a drying and upgrading device and method for polymer glue. The device comprises a raw material storage tank, a feeding hole of the pressurized rotary drum filter is communicated with the raw material storage tank; a feed port of the residue filtering tank is communicated with a solid discharge port of the pressurized rotary drum filter, and a discharge port is connected with a feed screw; a feeding hole of the first-stage drying machine is communicated with the feeding screw; the feed port of the second-stage upgrading dryer is communicated with the discharge port of the first-stage dryer; a feed port of the first-stage cyclone is communicated with a gas outlet of the first-stage dryer, the first-stage cyclone comprises a gas outlet and a solid outlet, and the solid outlet is communicated with the second-stage upgrading dryer; the feed port is communicated with the gas outlet of the second-stage upgrading dryer, the second-stage upgrading cyclone comprises a gas outlet and a solid outlet, and the solid outlet is communicated with the second-stage upgrading dryer. The device provided by the invention can prepare high-quality solid rubber powder, is environment-friendly, can filter and remove a large amount of solvent through the pressurized rotary drum, greatly reduces the load of drying and upgrading, and is energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention relates to the field of polymer glue drying, and in particular to a polymer glue drying and quality improvement device and method. Background Art

[0002] With the improvement of people's living standards, the demand for polymer glue is increasing. The drying process of polymer glue is a high-energy and high-investment process. How to minimize the amount of organic residue in the product or recover the maximum amount of organic solvent has become the focus of competition in the industry. Therefore, it is of great practical significance to develop a method for filtering, drying and improving the quality of polymer glue. Summary of the invention

[0003] The purpose of the present invention is to provide a drying and upgrading device for polymer glue.

[0004] The present invention also aims to provide a method for drying and upgrading a polymer glue.

[0005] To achieve the above object, the present invention provides a drying and upgrading device for polymer glue, comprising:

[0006] Raw material storage tanks;

[0007] A pressure drum filter, wherein the feed port of the pressure drum filter is connected to the raw material storage tank, and the pressure drum filter comprises a plurality of pressure chambers and a back-blowing discharge chamber;

[0008] A filter residue tank, wherein the feed port of the filter residue tank is communicated with the solid discharge port of the pressurized drum filter, and the discharge port of the filter residue tank is connected by a feed screw;

[0009] A primary dryer, wherein a feed port of the primary dryer is connected to the feed screw;

[0010] A secondary quality-improving dryer, wherein the feed inlet of the secondary quality-improving dryer is connected to the discharge outlet of the primary dryer;

[0011] A primary cyclone, wherein the feed port of the primary cyclone is connected to the gas outlet of the primary dryer, the primary cyclone comprises a gas outlet and a solid outlet, and the solid outlet is connected to the secondary quality-improving dryer;

[0012] A secondary upgrading cyclone, wherein the feed port of the secondary upgrading cyclone is connected to the gas outlet of the secondary upgrading dryer, the secondary upgrading cyclone comprises a gas outlet and a solid outlet, and the solid outlet is connected to the secondary upgrading dryer.

[0013] The drying and upgrading device for polymer glue of the present invention further comprises:

[0014] A solvent storage tank, the solvent storage tank being in communication with a gas outlet of the pressurized rotary drum filter;

[0015] A washing tower is connected with the gas outlet of the solvent storage tank, the gas outlet of the primary cyclone and the gas outlet of the secondary cyclone.

[0016] The polymer glue drying and upgrading device of the present invention, the primary dryer is of paddle type, double-shaft disc type or film type.

[0017] The polymer glue drying and upgrading device of the present invention, the secondary upgrading dryer is a fluidized bed type, a ridge type or a barrel type.

[0018] The drying and upgrading device for polymer glue of the present invention, the washing tower is a cyclone plate tower, a packed tower or a plate tower.

[0019] To achieve the above object, the present invention also provides a drying and upgrading method for a polymer glue, comprising the following steps:

[0020] S1, concentrating the polymer slurry through a pressure drum filter to obtain a filter cake with a solid content of 40 to 50 wt%;

[0021] S2, the filter cake is broken up and enters the primary dryer, where it is intermittently heated by external low-pressure steam to evaporate the solvent, reducing the solvent content in the solid to below 0.5wt%. The evaporated solvent is separated from the solid by a primary cyclone, and the gas enters the washing tower for washing and dehumidification;

[0022] S3, the solid after the primary drying and the solid obtained by the primary cyclone gas-solid separation are transported to the secondary quality-improving dryer, and the closed nitrogen is used for circulation drying to reduce the solid solvent content to below 0.05wt%. The tail gas generated during the circulation drying process is separated from the gas by the secondary cyclone, and the solid is returned to the secondary quality-improving dryer, and the gas enters the washing tower for washing and dehumidification.

[0023] In the drying and upgrading method for polymer glue of the present invention, the solid content of the polymer glue slurry is 3-5wt%.

[0024] The drying and upgrading method for polymer glue described in the present invention comprises the pressure drum filter comprising a plurality of pressure chambers and a back-blowing unloading chamber.

[0025] In the drying and upgrading method for polymer glue of the present invention, during the concentration in step S1, 0.5-0.7 MPa compressed nitrogen is introduced into the pressurized drum filter for pressurization and back-flushing.

[0026] In the drying and upgrading method for polymer glue of the present invention, the nitrogen temperature in step S3 is 170-180°C.

[0027] Beneficial effects of the present invention:

[0028] The present invention discloses a drying and upgrading device for polymer glue, which integrates filtering, drying and upgrading, and can obtain glue powder with low solvent residue, and can be widely used in home decoration, painting and wardrobes, etc. The nitrogen consumed by the filtration and primary drying of the present invention can be further treated and then all used for the closed-loop circulation of nitrogen in the upgrading stage, thereby reducing energy consumption. The present invention introduces a pressurized drum filter, which greatly reduces the moisture content of solid colloids, and is more energy-saving, reduces investment, and saves land compared to direct spray drying. The present invention adopts a fully enclosed continuous operation, which has good safety effects, and the three units of filtration, drying and upgrading are relatively independent, the residence time can be flexibly adjusted, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a polymer glue drying and upgrading device of the present invention.

[0030] Wherein, the reference numerals are:

[0031] 1-pressure drum filter; 2-raw material storage tank; 3-feed pump; 4-filter residue tank; 5-feed screw; 6-solvent storage tank; 7-solvent pump; 8-primary dryer; 9-primary dryer discharge valve; 10-disperser; 11-primary cyclone; 12-primary cyclone discharge valve; 13-secondary quality improvement dryer; 14-secondary quality improvement fan; 15-secondary quality improvement heater; 16-secondary quality improvement cyclone; 17-secondary quality improvement cyclone discharge valve; 18-washing tower; 19-circulation pump; 20-heat exchanger; 21-secondary quality improvement discharge valve. DETAILED DESCRIPTION

[0032] The technical scheme of the present invention is described in detail below. The following implementation modes are implemented on the premise of the technical scheme of the present invention, and a detailed implementation process is given. However, the protection scope of the present invention is not limited to the following implementation modes. The structures or experimental methods of specific conditions are not specified in the following implementation modes, and generally conventional conditions are followed.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1The figure shows a schematic diagram of the polymer glue drying and upgrading device of the present invention, which includes a raw material storage tank 2, a pressure drum filter 1, a filter residue tank 4, a primary dryer 8, a secondary upgrading dryer 13, a primary cyclone 11, a secondary upgrading cyclone 16, a solvent storage tank 6 and a washing tower 18. The feed port of the pressure drum filter 1 is connected to the raw material storage tank 2, and a feed pump 3 can also be arranged between the raw material storage tank 2 and the pressure drum filter 1, which is used to transport the slurry to be treated stored in the raw material storage tank 2 to the pressure drum filter 1. The pressure drum filter 1 includes multiple groups of pressure chambers and a group of back-blowing unloading chambers; the pressure drum filter 1 includes a gas discharge port and a solid discharge port, the feed port of the filter residue tank 4 is connected to the solid discharge port of the pressure drum filter 1, and the solvent storage tank 6 is connected to the gas discharge port of the pressure drum filter 1. A solvent pump is provided at the bottom of the solvent storage tank 6 for transferring the solvent in the solvent storage tank 6 to other containers. The discharge port of the filter residue tank 4 is connected to a feed screw 5. The feed port of the primary dryer 8 is communicated with the feed screw 5. The secondary quality-improving dryer 13 includes a feed port and a discharge port. The feed port is communicated with the discharge port of the primary dryer 8. A primary desiccant discharge valve 9 and a disperser 10 are provided between the discharge port of the primary dryer 8 and the feed port of the secondary quality-improving dryer 13. A secondary quality-improving discharge valve 21 is provided on the discharge port for discharging the dried product. The feed inlet of the first-stage cyclone 11 is connected to the gas outlet of the first-stage dryer 8, the first-stage cyclone 11 includes a gas outlet and a solid outlet, the solid outlet is connected to the second-stage upgrading dryer 13, and a first-stage cyclone discharge valve 12 is provided between the solid outlet of the first-stage cyclone 11 and the second-stage upgrading dryer 13; the feed inlet of the second-stage upgrading cyclone 16 is connected to the gas outlet of the second-stage upgrading dryer 13, the second-stage upgrading cyclone 16 includes a gas outlet and a solid outlet, the solid outlet is connected to the second-stage upgrading dryer 13, and the second-stage upgrading cyclone 16 solid A secondary upgrading cyclone discharge valve 17 is provided between the gas outlet and the secondary upgrading dryer 13; the washing tower 18 is connected with the gas outlet of the solvent storage tank 6, the gas outlet of the primary cyclone 11 and the gas outlet of the secondary upgrading cyclone 16, the gas outlet of the washing tower 18 is connected with the secondary upgrading dryer 13, and a secondary upgrading fan 14 and a secondary upgrading heater 15 are provided on the connecting pipeline, which are used to recycle the nitrogen obtained after washing by the washing tower 18 to the secondary upgrading dryer 13, and the washing tower includes a circulating pump 19 and a heat exchanger 20 for providing low-temperature water for the washing tower.

[0036] In a specific embodiment, the primary dryer 8 is of paddle type, double-shaft disc type or film type.

[0037] In a specific embodiment, the secondary upgrading dryer 13 is a fluidized bed type, a ridge type or a barrel type.

[0038] In one embodiment, the washing tower 18 is a cyclone plate tower, a packed tower or a plate tower.

[0039] When using the above-mentioned device to dry and upgrade the polymer glue, the polymer glue with a solid content of 3-5wt% stored in the raw material storage tank 2 is pressurized by a 0.3-0.5MPa feed pump 3 and enters the filter chamber of the drum pressure filter 1. The drum pressure filter 1 is provided with multiple groups of pressure chambers and a group of back-blowing unloading chambers. The polymer glue slurry is hydraulically filtered to a filter cake with a solid content of 40-50wt% under 0.5-0.7MPa compressed nitrogen pressurization and back-blowing, and is discharged from the solid discharge port of the drum pressure filter 1 into the filter residue tank 4, and the gas-water mixture enters the solvent storage tank 6 through the central pipe to achieve gas-liquid separation.

[0040] The filter cake with a solid content of 40 to 50 wt% falls into the filter residue tank 4 and is continuously transported to the primary dryer 8 through the feed screw 5. The solvent is intermittently heated and evaporated by external low-pressure steam. After passing through the primary dryer 8, the solvent content in the solid is reduced to below 0.5 wt%. The dried solid rubber powder is discharged to the upgrading and drying process through the primary dryer discharge valve 9. The evaporated solvent passes through the primary cyclone 11 with nitrogen to achieve gas-solid separation. The gas enters the washing tower 18 for washing and dehumidification, and the solid returns to the secondary upgrading dryer 13 for deep upgrading and drying.

[0041] The solid rubber powder discharged from the primary dryer 8 is dispersed by the disperser 10 and enters the secondary quality-improving dryer 13. The secondary quality-improving dryer 13 uses closed nitrogen for circulation drying. The nitrogen is pressurized by the secondary quality-improving fan 14 and then heated to 170-180°C by the secondary quality-improving heater 15 to enter the secondary quality-improving dryer 13 for direct contact and heat exchange with the solid rubber powder. The dried tail gas is separated from the gas by the secondary quality-improving cyclone 16, and the solid returns to the secondary quality-improving dryer 13. The separated gas enters the washing tower 18 for washing and dehumidification. The liquid at the bottom of the washing tower 18 is pressurized by the circulating pump 19 and heat-exchanged to 0°C by the heat exchanger 20 and then recycled. The solid solvent content after the secondary quality-improving dryer 13 is reduced to less than 0.05%, and then discharged by the secondary quality-improving discharge valve 21. At the same time, a low-pressure nitrogen replenishment port and an exhaust gas discharge port are set on the circulating carrier gas pipeline.

[0042] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A drying and upgrading device for polymer glue, characterized in that: include: Raw material storage tanks; A pressure drum filter, wherein the feed port of the pressure drum filter is connected to the raw material storage tank, and the pressure drum filter comprises a plurality of pressure chambers and a back-blowing discharge chamber; A filter residue tank, wherein the feed port of the filter residue tank is connected to the solid discharge port of the pressurized drum filter, and the discharge port of the filter residue tank is connected to a feed screw; A primary dryer, wherein a feed port of the primary dryer is connected to the feed screw; A secondary quality-improving dryer, wherein the feed inlet of the secondary quality-improving dryer is connected to the discharge outlet of the primary dryer; A primary cyclone, wherein the feed port of the primary cyclone is connected to the gas outlet of the primary dryer, the primary cyclone comprises a gas outlet and a solid outlet, and the solid outlet is connected to the secondary quality-improving dryer; A secondary upgrading cyclone, wherein the feed port of the secondary upgrading cyclone is connected to the gas outlet of the secondary upgrading dryer, the secondary upgrading cyclone comprises a gas outlet and a solid outlet, and the solid outlet is connected to the secondary upgrading dryer.

2. The drying and upgrading device for polymer glue according to claim 1, characterized in that: Also includes: A solvent storage tank, the solvent storage tank being in communication with a gas outlet of the pressurized rotary drum filter; A washing tower is connected with the gas outlet of the solvent storage tank, the gas outlet of the primary cyclone and the gas outlet of the secondary cyclone.

3. The drying and upgrading device for polymer glue according to claim 1, characterized in that: The primary dryer is of paddle type, double-shaft disc type or film type.

4. The drying and upgrading device for polymer glue according to claim 1, characterized in that: The secondary quality-improving dryer is of fluidized bed type, ridge type or barrel type.

5. The drying and upgrading device for polymer glue according to claim 2, characterized in that: The washing tower is a cyclone plate tower, a packed tower or a plate tower.

6. A drying and upgrading method for polymer glue, characterized in that: Using the device according to any one of claims 1 to 5 comprises the following steps: S1, concentrating the polymer slurry through a pressure drum filter to obtain a filter cake with a solid content of 40 to 50 wt%; S2, the filter cake is broken up and enters the primary dryer, where it is intermittently heated by external low-pressure steam to evaporate the solvent, reducing the solvent content in the solid to below 0.5wt%. The evaporated solvent is separated from the solid by a primary cyclone, and the gas enters the washing tower for washing and dehumidification; S3, the solid after the primary drying and the solid obtained by the primary cyclone gas-solid separation are transported to the secondary quality-improving dryer, and the closed nitrogen is used for circulation drying to reduce the solid solvent content to below 0.05wt%. The tail gas generated during the circulation drying process is separated from the gas by the secondary cyclone, and the solid is returned to the secondary quality-improving dryer, and the gas enters the washing tower for washing and dehumidification.

7. The drying and upgrading method of polymer glue according to claim 6, characterized in that: The solid content of the polymer slurry is 3-5wt%.

8. The drying and upgrading method of polymer glue according to claim 6, characterized in that: The pressure drum filter comprises a plurality of pressure chambers and a back-blowing discharge chamber.

9. The drying and upgrading method of polymer glue according to claim 6, characterized in that: During the concentration in step S1, 0.5-0.7 MPa compressed nitrogen is introduced into the pressure drum filter for pressurization and back-flushing.

10. The drying and upgrading method of polymer glue according to claim 6, characterized in that: In step S3, the nitrogen temperature is 170-180°C.

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