Polyvinyl chloride resin heating and drying device

Abstract

The utility model relates to the technical field of a suspension method polyvinyl chloride resin drying system, in particular to a polyvinyl chloride resin heating and drying device which comprises a centrifugal machine, a mother liquor water tank, a preheating device, a heat exchange device, a drying bed and a filter cake conveying device, and a first mother liquor pipeline is fixedly communicated between a liquid outlet in the bottom of the centrifugal machine and a first liquid inlet in the upper portion of the mother liquor water tank. A second mother liquor pipeline is communicated between the mother liquor tank and the lower portion of the preheating device, a third mother liquor pipeline is communicated between the preheating device and the mother liquor tank, an air inlet is formed in the preheating device, a first hot air pipeline is communicated between the preheating device and the heat exchange device, and a second hot air pipeline is communicated between the heat exchange device and the drying bed. A filter cake conveying device is arranged on the lower portion of the centrifugal machine, and a drying bed is arranged at an outlet of the filter cake conveying device and communicated with a PVC resin pipeline. The vinyl chloride resin drying device is reasonable and compact in structure and convenient to use, reduces the cost input of vinyl chloride resin heating and drying, and improves the vinyl chloride resin drying efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of suspension method PVC resin drying system, and relates to a PVC resin heating and drying device. BACKGROUND

[0002] Polyvinyl chloride (PVC) is one of the commonly used thermoplastic plastics, and a chemical enterprise adopts a PVC suspension polymerization process to produce PVC products.

[0003] The principle of the PVC suspension polymerization process is to input monomer, desalted water, steam, initiator, dispersant or other solutions into a polymerization kettle to generate a polymerization reaction, obtain PVC slurry, filter, strip, dry and sieve the PVC slurry, and obtain the PVC product. A company produces PVC resin using a suspension polymerization method to obtain PVC slurry. The PVC slurry is subjected to solid-liquid separation by a centrifuge, and the PVC plastic product is dried by a drying system to obtain a PVC resin product. The mother liquor water from the solid-liquid separation of the centrifuge is collected, and the mother liquor water has a high temperature. The mother liquor water is pumped by a mother liquor water pump, cooled by a heat exchanger, and then sent to downstream biochemical treatment. The heat exchanger requires a large amount of circulating condensate water as a circulating cooling capacity to cool the mother liquor water, and the large amount of circulating condensate water causes high cost investment of the enterprise.

[0004] The drying system uses a steam heat exchanger to heat air, and then uses a blower to blow the hot air into a drying bed to dry the PVC filter cake after centrifugation. The steam used by the drying system is produced by a boiler of a heat and power plant, and the drying system requires a large amount of steam consumption, which causes high cost investment of the enterprise.

[0005] In summary, there is an urgent need for a PVC drying air heating device to solve the problem of high cost investment caused by high steam consumption and large amount of circulating condensate water required by the enterprise. SUMMARY

[0006] The utility model provides a PVC resin heating and drying device, which overcomes the above-mentioned deficiencies of the prior art, and effectively solves the problem of high cost investment of the existing PVC resin heating and drying device.

[0007] The technical scheme of the utility model is realized through the following measures: a PVC resin heating and drying device, which comprises a centrifuge, a mother liquor tank, a preheating device, a heat exchange device, a drying bed and a filter cake conveying device, a PVC slurry pipeline is fixedly connected to the feeding port of the centrifuge, a first mother liquor pipeline is fixedly connected between the bottom liquid outlet of the centrifuge and the upper first liquid inlet of the mother liquor tank, a second mother liquor pipeline is fixedly connected between the lower liquid outlet of the mother liquor tank and the lower liquid inlet of the preheating device, a third mother liquor pipeline is fixedly connected between the upper liquid outlet of the preheating device and the upper second liquid inlet of the mother liquor tank, an air inlet is arranged on the preheating device, a first hot gas pipeline is fixedly connected between the gas outlet of the preheating device and the gas inlet of the heat exchange device, a second hot gas pipeline is fixedly connected between the gas outlet of the heat exchange device and the bottom gas inlet of the drying bed, the filter cake conveying device is arranged at the lower part of the bottom discharge port of the centrifuge, the outlet of the filter cake conveying device is fixedly connected with the feeding port of the drying bed, and a PVC resin pipeline is fixedly connected to the bottom discharge port of the drying bed.

[0008] The following is a further optimization or / and improvement of the above-mentioned utility model technical scheme:

[0009] The preheating device comprises a horizontal cuboid air bellow and a left large and right small prismatic air outlet fixedly connected to the right end opening of the cuboid air bellow, the cuboid air bellow is provided with a serpentine coil pipe, the second mother liquor pipeline is fixedly connected between the lower liquid outlet of the mother liquor tank and the liquid inlet of the coil pipe, the third mother liquor pipeline is fixedly connected between the liquid outlet of the coil pipe and the upper second liquid inlet of the mother liquor tank, and one or more air inlets are arranged on the cuboid air bellow.

[0010] The serpentine coil pipe is arranged from bottom to top along the front side, the left side and the back side inside the cuboid air bellow in sequence, the serpentine coil pipe comprises a front side serpentine coil pipe, a left side serpentine coil pipe and a back side serpentine coil pipe, the front side serpentine coil pipe, the back side serpentine coil pipe and the left side serpentine coil pipe are connected in series, the front side serpentine coil pipe is provided with a liquid inlet at the bottom and a liquid outlet at the top, the second mother liquor pipeline is fixedly connected between the lower liquid outlet of the mother liquor tank and the liquid inlet of the front side serpentine coil pipe, and the third mother liquor pipeline is fixedly connected between the liquid outlet of the front side serpentine coil pipe and the upper second liquid inlet of the mother liquor tank.

[0011] One or more front side air inlets, left side air inlets and back side air inlets are evenly and separately arranged on the front side, the left side and the back side of the cuboid air bellow, and a grid plate is arranged on each of the front side air inlets, the left side air inlets and the back side air inlets.

[0012] The heat exchange device comprises a first heat exchanger and a second heat exchanger, a first hot gas pipeline is fixedly communicated between the right end outlet of the prismatic outlet and the air inlet of the first heat exchanger, a third hot gas pipeline is fixedly communicated between the air outlet of the first heat exchanger and the air inlet of the second heat exchanger, and a second hot gas pipeline is fixedly communicated between the air outlet of the second heat exchanger and the air inlet at the bottom of the drying bed.

[0013] The first steam pipeline is fixedly communicated with the top inlet of the first heat exchanger, the second steam pipeline is fixedly communicated between the first steam pipeline and the top inlet of the first heat exchanger, the first condensing pipeline is fixedly communicated with the bottom outlet of the first heat exchanger, and the second condensing pipeline is fixedly communicated between the bottom outlet of the second heat exchanger and the first condensing pipeline.

[0014] The third hot gas pipeline is fixedly installed with a blower, and the second mother liquor pipeline is fixedly installed with a liquid circulating pump.

[0015] The first control valve is fixedly installed on the second mother liquor pipeline between the liquid circulating pump and the bottom liquid inlet of the front side serpentine coil, the first mother liquor pipeline is fixedly communicated with the first control valve and the bottom liquid inlet of the front side serpentine coil, the second control valve is fixedly installed on the first mother liquor pipeline, the third control valve is fixedly installed on the third mother liquor pipeline, the second mother liquor pipeline is fixedly communicated with the second control valve and the top liquid outlet of the front side serpentine coil, and the fourth control valve is fixedly installed on the second mother liquor pipeline.

[0016] The mother liquor tank is fixedly provided with a liquid level meter.

[0017] The device further comprises a controller, and the blower, the liquid circulating pump, the first control valve, the second control valve, the third control valve, the fourth control valve and the liquid level meter are electrically connected with the controller.

[0018] The utility model discloses a structure is reasonable and compact, convenient to use, its utilize mother liquor water's waste heat, carry out heating to drying bed air, maximum limit utilization waste heat, effectively reduced mother liquor water temperature, reduced the burden to downstream biochemical treatment, reduced steam consumption, with safe, labor saving, simple, efficient characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0019] ATTACHED Figure 1 It is process flow schematic diagram of the utility model.

[0020] ATTACHED Figure 2 It is attached Figure 1 It is the structure schematic diagram of preheating device.

[0021] ATTACHED Figure 1The codes in the figure are as follows: 1 is a centrifuge, 2 is a mother liquor tank, 3 is a preheating device, 4 is a drying bed, 5 is a filter cake conveying device, 6 is a first mother liquor pipeline, 7 is a second mother liquor pipeline, 8 is a third mother liquor pipeline, 9 is an air inlet, 10 is a first hot gas pipeline, 11 is a second hot gas pipeline, 12 is a PVC resin pipeline, 13 is a cuboid wind box, 14 is a prismatic air outlet, 15 is a front side serpentine coil, 16 is a rear side serpentine coil, 17 is a left side serpentine coil, 18 is a front side air inlet, 19 is a rear side air inlet, 20 is a left side air inlet, 21 is a grid plate, 22 is a first heat exchanger, 23 is a second heat exchanger, 24 is a third hot gas pipeline, 25 is a first steam pipeline, 26 is a second steam pipeline, 27 is a first condensing pipeline, 28 is a second condensing pipeline, 29 is a blower, 30 is a liquid circulating pump, 31 is a first control valve, 32 is a first guide pipeline, 33 is a second control valve, 34 is a third control valve, 35 is a second guide pipeline, 36 is a fourth control valve, 37 is a liquid level meter, 38 is a PVC slurry pipeline, 39 is a liquid inlet, and 40 is a liquid outlet. DETAILED DESCRIPTION

[0022] The utility model is not limited by the following examples, and the specific implementation mode can be determined according to the technical scheme and actual situation of the utility model.

[0023] In the utility model, if no special instruction is given, the equipment and device used are all the equipment and device commonly known in the art.

[0024] In the utility model, for the convenience of description, the relative position relation of each component is described according to the layout direction of the drawings in the description, for example, the position relation of front, back, top, bottom, left and right is determined according to the layout direction of the drawings in the description. Figure 1 2 In the utility model, for the convenience of description, the relative position relation of each component is described according to the layout direction of the drawings in the description, for example, the position relation of front, back, top, bottom, left and right is determined according to the layout direction of the drawings in the description. Figure 1

[0025] The utility model will be further described in connection with the examples and drawings as follows:

[0026] Example 1: as shown in the drawings, Figure 1 ​​As shown, the polyvinyl chloride resin heating and drying device includes a centrifuge 1, a mother liquor tank 2, a preheating device 3, a heat exchanger 4, a drying bed 4, and a filter cake conveying device 5. A PVC slurry pipeline 38 is fixedly connected to the inlet of the centrifuge 1. A first mother liquor pipeline 6 is fixedly connected between the bottom outlet of the centrifuge 1 and the first inlet of the mother liquor tank 2 at the top. A second mother liquor pipeline 7 is fixedly connected between the bottom outlet of the mother liquor tank 2 and the bottom inlet of the preheating device 3. A filter cake conveying device 5 is also fixedly connected between the top outlet of the preheating device 3 and the first inlet of the mother liquor tank 2 at the top. A third mother liquor pipeline 8 is fixedly connected between the two liquid inlets. An air inlet 9 is provided on the preheating device 3. A first hot air pipeline 10 is fixedly connected between the air outlet of the preheating device 3 and the air inlet of the heat exchange device. A second hot air pipeline 11 is fixedly connected between the air outlet of the heat exchange device and the air inlet at the bottom of the drying bed 4. A filter cake conveying device 5 is provided below the bottom discharge port of the centrifuge 1. The outlet of the filter cake conveying device 5 is fixedly connected to the feed port of the drying bed 4. A PVC resin pipeline 12 is fixedly connected to the bottom discharge port of the drying bed 4.

[0027] The above-mentioned polyvinyl chloride resin heating and drying device can be further optimized and / or improved according to actual needs:

[0028] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 , 2 As shown, the preheating device 3 consists of a horizontal rectangular air box 13 and a frustum-shaped air outlet 14 with a left-larger and right-smaller opening fixedly connected to the right end of the rectangular air box 13. A serpentine coil is installed inside the rectangular air box 13. A second mother liquor pipeline 7 is fixedly connected between the lower outlet of the mother liquor tank 2 and the inlet of the coil. A third mother liquor pipeline 8 is fixedly connected between the outlet of the coil and the upper second inlet of the mother liquor tank 2. One or more air inlets 9 are provided on the rectangular air box 13.

[0029] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 , 2 As shown, the serpentine coils are arranged sequentially from bottom to top along the front, left, and rear sides inside the cuboid air box 13. The serpentine coils include a front serpentine coil 15, a left serpentine coil 17, and a rear serpentine coil 16. The front serpentine coil 15, the left serpentine coil 17, and the rear serpentine coil 16 are connected in series. The bottom of the front serpentine coil 15 is provided with an inlet 39, and the top of the front serpentine coil 15 is provided with an outlet 40. A second mother liquor pipeline 7 is fixedly connected between the lower outlet of the mother liquor tank 2 and the bottom inlet 39 of the front serpentine coil 15. A third mother liquor pipeline 8 is fixedly connected between the top outlet 40 of the front serpentine coil 15 and the upper second inlet of the mother liquor tank 2.

[0030] As required, as attached Figure 1 , 2As shown, the front serpentine coil 15, the left serpentine coil 17 and the rear serpentine coil 16 are made of DN50 stainless steel pipes, which can reduce the risk of leakage caused by corrosion and thinning of the high-temperature mother liquor water on the coil, and the high-temperature mother liquor water flows in the front serpentine coil 15, the left serpentine coil 17 and the rear serpentine coil 16 connected in series, which can effectively avoid the risk of freezing of the mother liquor water in the serpentine coil in winter.

[0031] Embodiment 4: It is different from Embodiments 1 to 3 in that, as shown in Figure 1 , 2 As shown, one or more front air inlets 18, left air inlets 20 and rear air inlets 19 are evenly spaced on the front side, left side and rear side of the cuboid wind box 13, and the front air inlets 18, left air inlets 20 and rear air inlets 19 are provided with a grid plate 21.

[0032] According to the needs, as shown in Figure 2 The grid plate 21 can be a filter screen or other filtering device capable of filtering air impurities, which can effectively prevent impurities from entering the cuboid wind box 13, thereby preventing impurities from entering the drying bed 4 and affecting the quality of PVC resin.

[0033] Embodiment 5: It is different from Embodiments 1 to 4 in that, as shown in Figure 1 , 2 The heat exchange device includes a first heat exchanger 22 and a second heat exchanger 23, the first heat exchanger 22 is fixedly connected between the outlet of the right end of the prismatic air outlet 14 and the air inlet of the first heat exchanger 22, the third hot gas pipeline 24 is fixedly connected between the air outlet of the first heat exchanger 22 and the air inlet of the second heat exchanger 23, and the second hot gas pipeline 11 is fixedly connected between the air outlet of the second heat exchanger 23 and the air inlet at the bottom of the drying bed 4.

[0034] According to the needs, the first heat exchanger 22 and the second heat exchanger 23 are finned heat exchangers, the tube side of the first heat exchanger 22 and the second heat exchanger 23 is filled with steam medium, and the shell side of the first heat exchanger 22 and the second heat exchanger 23 is filled with hot air medium.

[0035] Embodiment 6: It is different from Embodiments 1 to 5 in that, as shown in Figure 1 The first steam pipeline 25 is fixedly connected to the top inlet of the second heat exchanger 23, the second steam pipeline 26 is fixedly connected between the first steam pipeline 25 and the top inlet of the first heat exchanger 22, the first condensation pipeline 27 is fixedly connected to the bottom outlet of the first heat exchanger 22, and the second condensation pipeline 28 is fixedly connected between the bottom outlet of the second heat exchanger 23 and the first condensation pipeline 27.

[0036] Embodiment 7: It is different from Embodiments 1 to 6 in that, as shown in Figure 1As shown, the third hot gas pipeline 24 is fixedly installed with a blower 29, and the second mother liquor pipeline 7 is fixedly installed with a liquid circulating pump 30.

[0037] Embodiment 8, which is different from Embodiments 1 to 7, is as follows: Figure 1 As shown, the second mother liquor pipeline 7 between the liquid circulating pump 30 and the bottom liquid inlet 39 of the front side serpentine coil 15 is fixedly installed with a first control valve 31, the second mother liquor pipeline 7 between the first control valve 31 and the bottom liquid inlet 39 of the front side serpentine coil 15 is fixedly communicated with a first guide pipeline 32, the first guide pipeline 32 is fixedly installed with a second control valve 33, the third mother liquor pipeline 8 is fixedly installed with a third control valve 34, the third mother liquor pipeline 8 between the top liquid outlet 40 of the front side serpentine coil 15 and the third control valve 34 is fixedly communicated with a second guide pipeline 35, and the second guide pipeline 35 is fixedly installed with a fourth control valve 36.

[0038] Embodiment 9, which is different from Embodiments 1 to 8, is as follows: Figure 1 As shown, the mother liquor tank 2 is fixedly provided with a liquid level meter 37.

[0039] Embodiment 10, which is different from Embodiments 1 to 9, is as follows: Figure 1 As shown, a controller is included, and the blower 29, the liquid circulating pump 30, the first control valve 31, the second control valve 33, the third control valve 34, the fourth control valve 36 and the liquid level meter 37 are electrically connected with the controller.

[0040] According to needs, conventional valves, thermometers and pressure gauges commonly known in the art can be arranged on the pipelines and equipment of the polyvinyl chloride resin heating and drying device according to production needs.

[0041] In the utility model, mother liquor water is preheated and heated by the preheating device 3, hot air is heated again by the heat exchange device, and dry hot air is finally introduced into the drying bed 4 to blow dry the PVC filter cake on the drying bed 4. The utility model effectively utilizes mother liquor water waste heat, saves steam consumption, gradually reduces the temperature of mother liquor water, and reduces the circulating water cooling consumption required for cooling mother liquor water. Steam consumption is saved by 0.258t / h, and annual benefits are 163,000 yuan.

[0042] The above technical features respectively constitute various embodiments of the application, have strong adaptability and implementation effect, and can increase or decrease unnecessary technical features according to actual needs to meet the needs of different situations.

[0043] The utility model discloses a centrifuge, mother liquor water tank, air box, first heat gas pipeline, first heat exchange ware, air blower, second heat gas pipeline, second heat exchange ware, third heat gas pipeline, drying bed and PVC resin pipeline are connected, and the centrifuge is connected with the mother liquor water tank, the air box is connected with the first heat gas pipeline, the first heat gas pipeline is connected with the first heat exchange ware, the first heat exchange ware is connected with the air blower, the air blower is connected with the third heat gas pipeline, the third heat gas pipeline is connected with the second heat exchange ware, the second heat exchange ware is connected with the drying bed, and the drying bed is connected with the PVC resin pipeline.

Claims

1. A heating and drying device for polyvinyl chloride resin, characterized in that... The centrifuge, mother liquor tank, preheating device, heat exchange device, drying bed and filter cake conveying device are fixedly connected with the PVC slurry pipeline, the first mother liquor pipeline, the second mother liquor pipeline, the third mother liquor pipeline, the first hot gas pipeline, the second hot gas pipeline, the filter cake conveying device outlet and the PVC resin pipeline.

2. The polyvinyl chloride resin heating drying apparatus according to claim 1, characterized by The preheating device is composed of a horizontal cuboid air bellow and a left large and right small prismatic air outlet fixedly connected with the opening at the right end of the cuboid air bellow, and the cuboid air bellow is provided with a serpentine coil pipe.

3. The polyvinyl chloride resin heating drying apparatus according to claim 2, characterized by The serpentine coil pipe is arranged from bottom to top along the front side, left side and back side of the cuboid air bellow, and the serpentine coil pipe comprises a front side serpentine coil pipe, a left side serpentine coil pipe and a back side serpentine coil pipe.

4. The polyvinyl chloride resin heating drying apparatus according to claim 2 or 3, characterized by The front side, left side and back side of the cuboid air bellow are respectively and evenly spaced provided with one or more front side air inlets, left side air inlets and back side air inlets.

5. The polyvinyl chloride resin heating drying apparatus according to claim 4, characterized by The heat exchange device comprises a first heat exchanger and a second heat exchanger.

6. The polyvinyl chloride resin heating drying apparatus according to claim 5, characterized by The first steam pipeline, the second steam pipeline, the first condensing pipeline and the second condensing pipeline are fixedly connected with the first steam pipeline, the second steam pipeline, the first condensing pipeline and the second condensing pipeline.

7. The polyvinyl chloride resin heating drying apparatus according to claim 5 or 6, characterized by A blower is fixedly installed on the third hot gas pipeline, and a liquid circulating pump is fixedly installed on the second mother liquor pipeline.

8. The polyvinyl chloride resin heating drying apparatus according to claim 7, characterized by The first control valve is fixedly installed on the second mother liquid pipeline between the liquid circulating pump and the bottom liquid inlet of the front side serpentine coil, the first guide liquid pipeline is fixedly communicated on the second mother liquid pipeline between the first control valve and the bottom liquid inlet of the front side serpentine coil, the second control valve is fixedly installed on the first guide liquid pipeline, the third control valve is fixedly installed on the third mother liquid pipeline, the second guide liquid pipeline is fixedly communicated on the third mother liquid pipeline between the top liquid outlet of the front side serpentine coil and the third control valve, and the fourth control valve is fixedly installed on the second guide liquid pipeline.

9. The polyvinyl chloride resin heating drying apparatus according to claim 8, characterized by The liquid level meter is fixedly arranged on the mother liquid tank.

10. The polyvinyl chloride resin heating drying apparatus according to claim 9, characterized by The controller is electrically connected with the air blower, the liquid circulating pump, the first control valve, the second control valve, the third control valve, the fourth control valve and the liquid level meter.

Images