Regarding the failures of steam injectors
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I would like to ask everyone: When the vaporizer is first put into use, it can achieve a high level of vacuum, but this level is only maintained for about ten minutes before it starts to drop. I’ve noticed that the pipe leading from the top of the condenser connected to the vaporizer to the vacuum pump is hot right now. Could it be that the condensing efficiency of the condenser has declined? Is the low vacuum caused by other reasons?
There should be water seals on the pipes at both the front and back; check to see if the water seals have been damaged
It’s probably a problem with the cooling effect of the condenser. The temperature of the exhaust pipe behind the condenser should not be higher than the temperature of the water exiting the condenser.
I remember encountering such a problem before; it seems that something was blocking the pipeline through which the vacuum steam moves toward the condenser. Check whether there are any debris at the connection points of this pipeline Remove the jet pump and check whether the pipelines are blocked. Second, check for any cracks. Especially the pipelines near the ejector pump, as well as the associated vacuum system, should be checked for any air leaks. Third, is there a blockage in the condenser below the jet pump, preventing the steam from cooling down? If none of the above conditions apply, please check whether there are pinhole leaks in the fin tubes of the tower top along with the air cooler, and perform a pressure test on the system for a thorough inspection.
This post was last edited by gjn1970 on 2016-5-24 at 14:15. It seems that the vacuum level of the condenser is still too low. At the time vacuuming began, the unit’s load was zero; as the unit’s load increased, the load on the condenser also increased, and accordingly more cooling water was required. If the flow rate of cooling water is insufficient, or if the condenser tubes are dirty or leaking, it will affect the vacuum level of the condenser. In addition, during the startup and operation of the condenser unit, various types of drain water flow in, such as drain water from the low-pressure heater, regular drain water from the pipelines, and drain water in case of an accident in the high-pressure heater. Large units also have a low-pressure bypass system; if any pipeline or valve within the vacuum system leaks air, it will affect the vacuum level of the condenser. Internal leaks in valves connected to the condenser, such as those in the high-pressure heater or the drain valves, will increase the thermal load on the condenser. All of the above will lead to a decrease in the condenser vacuum and an increase in the turbine exhaust temperature, resulting in the \"vacuum extraction pipeline of the steam ejector being hot\".
I would like to ask everyone: Our vacuum system initially used a water ring vacuum pump to create a vacuum, with the help of a jet pump as well. At first, when steam injection was started, everything worked normally, but this normal state lasted for only a short time; after that, the problems described in the original post occurred, along with insufficient performance……
It would be better to add some diagrams to facilitate discussion and analysis.