Steam turbine problems

To make a few digressions, it is best to ask the master on site first if you have these questions. If they don’t understand something or don’t understand it, it’s best to post it for discussion. Because your communication with the on-site master is based on real objects, it is the best on-site teaching. For reference. Try to answer some of your questions ； 1. Those holes should be holes with threaded buttons for fixing accessories as needed. ； 2. The driving oil maintains pressure and has no flow when at rest. ； 3. This is related to the actual installation settings on site. ； 4. No ； Yes. For reference only. Again, please ask the masters around you, on-site teaching is much better than here.

Reply 2. How to drive the oil return pipeline? 4. The tee is on the low-pressure side of the steam seal cooler pipe, so why won’t the atmosphere be drawn back?

2. The pressure at both ends of the piston in the hydraulic cylinder is changed by the solenoid valve. 4. The tee you call is not a simple tee. It is a principle that creates negative pressure in the branch by passing through the high-speed flowing gas. Clear for reference.

Reply 1 The main valve disc is equipped with an unloading valve. The regulating valve is closed when the quick-closing valve is opened. As the unloading valve is raised, the pressure before and after the main valve disc tends to be balanced, causing the main valve opening force to decrease.

Reply 2. The oil return of the quick-closing valve is that when the quick-closing oil loses pressure, the piston disc and the piston are separated under the action of the spring force, and the quick-closing oil on the left side of the piston disc is discharged from the return oil.

Tips from the Design Institute: Let me ask you some questions. 1. Why are there several holes in the valve core of the turbine quick-closing valve? Will this affect the sealing? What you should be talking about is the position of the quick-closing valve head. That position is not a simple valve head like a gate valve, but consists of two valve heads. Just like the picture above. This is to reduce the resistance when the quick closing valve opens. 2. Is the return oil of the turbine quick-closing valve always flowing? There is always oil in the return oil. This is because when the quick-stop oil overcomes the force of the spring, a small part of it flows into the oil return pipe through the gap between the piston and the piston cylinder where the spring is located. The amount is very small. If the piston seal is poor, the amount of oil will increase, so the quick-closing valve will not be able to build up pressure. As a result, the quick closing valve cannot be opened. 3. There is no drain line after the turbine inlet silencer. How to warm the pipeline between the silencer and the quick-closing valve? 1. When the pipe in front of the heater is emptied, steam will flow to this section. 2. The venting can be turned off and a small amount of steam can pass through this section through the front double line. 4. The steam turbine steam seal cold air extractor pipeline is connected to the exhaust pipeline with a tee when entering the steam seal cooler. Will air be sucked into the cooler during normal operation? Normally it won't, because 1. The vent valve on the left side of the tee is normally closed. 2. Judging from field experience, white smoke often emits from the vent on the left side of the air seal body. This means that the pressure is still greater than the air, so air will not be sucked in. 5. Why is a safety valve installed at the outlet of a back-pressure steam turbine? Is it to prevent the upstream steam from suddenly increasing and the outlet pipeline being unable to withstand it? The main thing is safety. If you think about it, if the steam turbine is not running, or if it is running without load, the pressure downstream of the steam will be too high. Firstly, it is unsafe for downstream equipment and so on. The other reason is that it is unsafe. There must be a safety valve downstream of all pressure reducing equipment. For example, the outlet of a hydraulic turbine must also be equipped with a safety valve.

The pre-opening valve allows flow when the hole is opened, and the quick-closing valve line is sealed. Those holes do not affect the tightness, and it has nothing to do with it.