steam heating line
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The heating equipment in our workshop uses medium-pressure and high-pressure steam to heat the steam (low-pressure steam) generated by medium- and high-pressure condensation as the heat tracing of the pipeline. However, during the production process, the steam condensation pipeline made a banging sound. What is the cause of this? What can I do to eliminate the sound?
The local temperature difference in the pipeline is large and water hammer occurs.
A normal condensation system should not have this phenomenon. Generally, the water hammer phenomenon caused by the large temperature difference will occur when the condensate has just been connected to the grid. This phenomenon should not occur under normal steady state. It is recommended that the owner check the steam trap to see if steam is discharged, causing water hammer.
This post was last edited by jlchina on 2010-3-17 15:26 This situation will definitely happen, it's just about the size. It has no direct relationship with whether the trap is normal or not, but is caused by the characteristics of the system itself. The reasons are as follows: 1. The high-pressure steam condensate-saturated state is in front of the trap, and the pressure is medium and high pressure. 2. After the trap enters and merges into the low-pressure system, the pressure is low pressure. In the low-pressure system, the pressure must be balanced, and the heat (enthalpy) must also be balanced. Saturated steam condensate (enthalpy) in saturated state before the trap - liquid phase ； There is also a saturated state behind the trap, but there are only two phases of vapor and liquid. The biggest problem with two-phase flow is to avoid plunger flow, otherwise vibration will occur. This phenomenon is more serious when the trap is leaking. Two-phase flow - strict calculations must be made during design. Otherwise the consequences will be serious. For steam systems, more attention is needed when high-pressure condensate enters the low-pressure system. In fact, medium- and high-pressure steam condensate is generally not directly connected to the low-pressure system. Before entering the low-pressure system, there must be a steam condensate flash tank, medium- and high-pressure steam condensate to generate low-pressure steam condensate, and low-pressure steam that enters the pipe network respectively. If there is no flash tank, then there is something wrong with the design of the system.
Regarding the reasons for this, the person above has done an in-depth analysis. However, it is worth emphasizing that the impact of secondary steam generated by steam condensate on the pipeline must be fully considered.
Thank you everyone! So how can I diagnose what is wrong? It should be because there are several traps and the system has a flash tank.
There is condensed water accumulated in the pipe. Use the front drain to drain the water and turn the steam opening to a small value.