Material crystallization issue in pipelines
Thread Content
As shown in the figure, this set of equipment is an intermittent production system that starts and stops as needed. This yellow raw material pipe is actually delivered by a surface transfer pump into a tank located 10 meters high. A jacket with 75°C hot water is used for insulation (this on-site diagram does not show this raw material pipe; the raw material pipe is completely covered). Since the raw material begins to crystallize when the temperature drops below 60°C, the heat retention in this section is not optimal, which leads to pipe blockage upon the next startup. The provisional solution for now is to connect nitrogen at the pump outlet and use it for purging after each transfer, but this may not be sufficient to completely clear it. Is there any other more reliable way? ? Seeking advice
The following methods can be considered to address the issue of crystallization of materials inside the pipeline: 1. Increase the temperature of the hot water in the jacket to ensure that the temperature of the materials inside remains above the crystallization point. 2. Improve the insulation material or reinforce the insulation layer to enhance the insulation effect. 3. During periods of intermittent production shutdown, the contents inside can be heated cyclically to prevent crystallization caused by temperature drops. 4. Install an online heating system, such as an electric heating strip, to assist in maintaining the temperature of the material. 5. Modify the production process to reduce downtime and shorten the residence time of materials in the pipelines. 6. If conditions permit, consider switching to continuous production to avoid materials staying in the pipes for long periods. .
It’s relatively easy to maintain a consistent temperature with a jacket; if the insulation isn’t working well, it’s necessary to check the insulation carefully
According to the factory’s operations, it seems that only the first 3 options can be considered. Too many bends in the hot water pipe of DN15 may affect the flow of hot water.
The heat tracing tube is too thin: ( It has too many bends during installation, which prevents smooth water flow. The first time hot water was turned on, it heated up very slowly.
It’s a jacket, but the hot water inlet and outlet are connected via DN15 thin pipes
Transportation is carried out using submersible pumps and sumps; no check valve is installed at the pump outlet, and the material is returned after the pump is stopped
Can the graben still be used? How to connect the geosyncline?
The materials that arrive are first placed in the channel, and then pumped out using submersible pumps