PVC drying

have a look http://www.kcdry.com/cpdk.asp?id=319 It is the best process for drying PVC.

I was a little inspired by the post above! Thank you! Thank you!

Nowadays, cyclone drying is commonly used, and I think the technology developed by Tsinghua University is better.

Shanghai Chlor-Alkali introduced German airflow-cyclone drying technology, which is now completely domestic. This technology occupies less space than Tsinghua University-Xuzhou drying technology, has greater operating capacity, and is more energy-saving, especially saving nearly 50% of electricity.

Air flow pulse-cyclone drying technology can indeed achieve the purpose of drying by changing the residence time of materials to fully conduct heat exchange.

The best technology is to use the bulk method to produce PVC without drying.

Tsinghua University's drying technology has indeed made great improvements in energy saving, but I personally think it is not suitable for use in large-scale production equipment. When the production scale is large, the return air volume is large, the product quality has many yellow spots, and most of them are light-weight gray impurities.

We are using technology from Tsinghua University.

If anyone has any information, please pass it on! Thank you

I agree with what the 10th floor said. Our 80,000-ton device has used Tsinghua technology. The finished product has a lot of impurity ions, mostly yellow dots, and is a defective product. After the exhaust gas from the cyclone drying bed does not enter the air flow drying tower, the quality immediately improves. But Tsinghua's process is energy-saving.

There are papers published on the 200,000-ton PVC horizontal two-stage boiling drying bed developed by Dagu Chemical. You can compare it with air pulse-cyclone drying. Dagu Chemical's PVC resin output now reaches 70,000 tons/month, and the high-grade resin rate is over 99%. And because the drying bed is only one of many factors that affect resin quality. Resin steam consumption is less than 0.85 (drying is less than 0.45) Horizontal two-stage boiling drying bed: 1. The bed board adopts a wind cap, and the boiling condition is good. The wind cap can prevent PVC leakage, and there is no material in the wind room. 2. The drying bed structure is changed into two chambers. PVC resin leaves a chamber containing 3% water, and the finished PVC resin contains water * * Lower than product quality requirements. PVC resin residence time is 2 hours. 3. Heating method: hot air, low-pressure steam, and hot water are used as heat transfer media. The first chamber of the drying bed is heated by hot air and low-pressure saturated steam at the same time. The low-pressure steam heats the PVC material through the internal heat pipe. And the low-pressure steam condensed water flows into the dry hot water tank, and the hot water in the dry hot water tank transfers heat through the internal heat pipeline and the PVC resin in the second room of the drying bed. Therefore, due to the direct heating of steam, the temperature difference is high, the heat transfer effect is significantly improved, the heat source is fully utilized, and the steam consumption is low, less than 0.45. 4. The internal heating of the drying bed is an upright fence-type internal heat pipe. The drying bed is not easy to die, and there are no dead corners in the bed after the transformation. Under good control, red and yellow spots are unlikely to appear. If there are no force majeure factors, it can run stably for a long time. 5. An automatic bed arrangement system is added to make the modification very convenient. Drying bed flushing is more convenient and easier to complete. 6. Low power consumption. 7. Large production capacity. 8. Negative pressure operation, the centrifuge discharges materials directly into the drying bed, without the need for an auger. shortcoming: The investment is relatively large and it takes a long time to drive and park. However, in view of the long-term stable operation, the starting and stopping time can be ignored. 3 Wet material 1 2 AIR AIR HW product STL CDL low pressure steam CDL 1. One room ； 2. Second chamber 3. Cyclone separator

There are papers published on the 200,000-ton PVC horizontal two-stage boiling drying bed developed by Dagu Chemical. You can compare it with air pulse-cyclone drying. Dagu Chemical's PVC resin output now reaches 70,000 tons/month, and the high-grade resin rate is over 99%. And because the drying bed is only one of many factors that affect resin quality. Resin steam consumption is less than 0.85 (drying is less than 0.45) Horizontal two-stage boiling drying bed: 1. The bed board adopts a wind cap, and the boiling condition is good. The wind cap can prevent PVC leakage, and there is no material in the wind room. 2. The drying bed structure is changed into two chambers. PVC resin leaves a chamber containing 3% water, and the finished PVC resin contains water * * Lower than product quality requirements. PVC resin residence time is 2 hours. 3. Heating method: hot air, low-pressure steam, and hot water are used as heat transfer media. The first chamber of the drying bed is heated by hot air and low-pressure saturated steam at the same time. The low-pressure steam heats the PVC material through the internal heat pipe. And the low-pressure steam condensed water flows into the dry hot water tank, and the hot water in the dry hot water tank transfers heat through the internal heat pipeline and the PVC resin in the second room of the drying bed. Therefore, due to the direct heating of steam, the temperature difference is high, the heat transfer effect is significantly improved, the heat source is fully utilized, and the steam consumption is low, less than 0.45. 4. The internal heating of the drying bed is an upright fence-type internal heat pipe. The drying bed is not easy to die, and there are no dead corners in the bed after the transformation. Under good control, red and yellow spots are unlikely to appear. If there are no force majeure factors, it can run stably for a long time. 5. An automatic bed arrangement system is added to make the modification very convenient. Drying bed flushing is more convenient and easier to complete. 6. Low power consumption. 7. Large production capacity. 8. Negative pressure operation, the centrifuge discharges materials directly into the drying bed, without the need for an auger. shortcoming: The investment is relatively large and it takes a long time to drive and park. However, in view of the long-term stable operation, the starting and stopping time can be ignored.

The two-stage ebullating drying bed in Daku Chemical is a technology introduced from Japan’s Chisso, right?

Shandong Xinfa Chemical introduced Niro ebullating drying bed from the Netherlands, which is the most advanced ebullating drying bed currently introduced in China. It covers an area and has a large processing capacity. It saves about 30% of energy compared to others. It is relatively expensive to introduce equipment.

Shandong Xinfa Chemical introduced the Dutch Niru ebullating drying bed, which is the most advanced ebullating drying bed currently introduced in China. It occupies a small area and has large processing capacity. It saves about 30% of energy compared to other equipment. It is relatively expensive to introduce equipment.

Dahua did introduce Japan's Chisso two-stage fluidized bed (40,000 tons). The 200,000-ton model is a horizontal two-chamber fluidized bed, not a two-stage type. But there are big differences between the two types of beds. Chisso's two-stage fluidized bed is only promoted in China as Dahua's 40,000-ton bed and Canghua's 100,000-ton bed, both of which are two-stage. The 200,000-ton horizontal two-chamber fluidized bed is completely developed and designed by ourselves. At present, Chiso Japan does not have a 200,000-ton stripper and a two-stage fluidized bed!