Exchange of experiences on winter antifreeze at northern chlor-alkali plants
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This post was last edited by sunjl1981 on 2013-1-6 23:42. Our company is located in the Bohai Sea area, and the lowest temperature in winter is around -10 degrees. Although the climate has warmed in recent years, frozen crystals still often appear on materials, especially 48% liquid alkali pipelines, concentrated and dilute sulfuric acid pipelines, water systems, etc. There are pipeline blockages. I hope colleagues from similar manufacturers can contact their actual situations, exchange experiences with each other, and strive to survive this winter safely. This post was last edited by limingshuguang on 2008-1-15 10:58 ] # , , &
Steam tracing or electric heating can be used.
Materials are less likely to crystallize or freeze when they are in a flowing state. After the materials are pumped, they must be emptied. If there is no accumulation of materials, they will not crystallize or freeze. Under normal circumstances, liquid alkali and sulfuric acid must have antifreeze and heat preservation accompanying pipes.
I agree with what was said above. In addition, the liquid alkali pipelines need to be purged to drain them after they are installed in winter. The water system should have constant running water to prevent freezing. Both liquid alkali and sulfuric acid must have anti-freeze insulation accompanying pipes or electric tape insulation.
Generally speaking, anti-freeze issues are taken into consideration when designing chlor-alkali, so concentrated alkali and dilute acid pipelines in general plants are equipped with steam tracing, and the water system also has anti-freeze design. But for some old factories, these devices may be gone or out of service, so there is a problem of freezing. Generally, the steam purging method is used, that is, steam or compressed air is used to purge the pipeline immediately after the material is delivered. As long as the people on duty have a little sense of responsibility, there will be no freezing phenomenon. In such a factory, technology is no longer decisive. It is mainly a management issue. Strengthen management.
In places where insulation is important, steam should be added with heat and conductive showers. The water should be drained regularly. When the pump is not in use, the water should be drained. The water seal of the machine should be turned on at all times.
Thank you for your guidance! We will handle it based on our actual situation.
Pipelines in chemical plants in the northern region all need heat tracing protection, steam or electric heating and insulation. This is to avoid freezing pipes due to incomplete drainage of water in the pipelines during winter shutdown for maintenance.