【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20191230
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Sorry, sorry – the “one question per day” routine has almost turned into “one question per week”. Question: What are the measures to reduce steam leakage through the partitions? There are no answers provided for this series of posts; fellow netizens are free to share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! Chemical Equipment and Machinery
Install shroud vapor seals: Axial vapor seals are placed at the nozzle and at the root of the blades to reduce the amount of vapor that leaks into those blades. Balance holes are created on the impeller, and an appropriate degree of reaction is employed at the root of the blades.
Comb-tooth type vapor seal is used at the partition and rotating shaft； An axial steam seal is installed at the top of the moving blade to reduce air leakage into it ； Balance holes are provided on the impeller, and an appropriate reaction degree is used at the root of the moving blades, so that the air leakage from the diaphragm flows through these balance holes to the area behind the stage, thereby preventing the leakage air from entering the moving blades and disturbing the main airflow.
Comb-tooth type vapor seal is used at the partition and rotating shaft； An axial steam seal is installed at the top of the moving blade to reduce air leakage into it ； Balance holes are provided on the impeller, and an appropriate reaction degree is used at the root of the moving blades, so that the air leakage from the diaphragm flows through these balance holes to the area behind the stage, thereby preventing the leakage air from entering the moving blades and disturbing the main airflow.
Install baffle steam seals. Axial steam seals are placed at the nozzle and at the root of the blades to reduce the amount of steam that leaks into the blades. Balance holes are created on the impeller. An appropriate reaction force is applied at the root of the blades.
Since the steam leakage rate through the partition is proportional to the area of the gap and the pressure difference on both sides, in order to reduce steam leakage losses, it is necessary to minimize the gap area and the pressure difference. The following measures can be taken: (1) Use a comb-toothed steam seal at the junction of the partition and the rotating shaft. (2) An axial steam seal is installed at the root of the moving blade to reduce steam leakage into it. (3) Balance holes are provided on the impeller, and an appropriate reaction degree is adopted at the root of the moving blades, so that the steam leaking through the diaphragm flows to the rear of the stage via these balance holes, thereby preventing the leaked steam from entering the moving blades and disturbing the main steam flow.
1) Install partition steam seals to reduce steam leakage; 2) Install radial steam seals at the root of the moving blades; 3) Use an appropriate reaction degree in the design so that the blade roots do not absorb or leak steam; 4) Provide balance holes on the impeller so that steam leaking through the partitions can escape via these holes to the rear of the stage, thereby preventing it from mixing with the main flow.
1. Install a tip seal at the top of the moving blade. 2. Add a baffle seal. 3. Install a radial seal at the root of the moving blade
1 Use a comb-tooth type steam seal; 2 Install a sleeve-type steam seal; 3 Employ an appropriate reaction degree
Comb-tooth type vapor seal is used at the partition and rotating shaft； An axial steam seal is installed at the top of the moving blade to reduce air leakage into it ； Balance holes are provided on the impeller, and an appropriate reaction degree is used at the root of the moving blades, so that the air leakage from the diaphragm flows through these balance holes to the area behind the stage, thereby preventing the leakage air from entering the moving blades and disturbing the main airflow.