【Q&A Question 109】April 19, 2017
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【Q&A Question 109】April 19, 2017: Why is it necessary to drain water before starting a turbine? The reference answer can be seen after responding; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) During the pre-startup pipe warming and machine heating process, steam condenses into water as soon as it comes into contact with cold surfaces. If this condensed water is not removed promptly, the fast-moving steam stream can carry this water into the steam drum, thereby damaging the blades. Therefore, it is necessary to open the drain valve before starting up in order to remove the condensed water. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Savings” campaign (sponsors sought; highest returns ever) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this campaign; those interested can contact the event organizer. Petrochemical deep processing version – the event to share pictures of chemical equipment has started! A vast amount of wealth, as well as HChuan coins, are waiting for you to claim them. http://bbs.hcbbs.com/thread-1760733-1-1.html Notice regarding the collection of chemical engineering technical materials in the “Petroleum and Chemicals Section”. http://bbs.hcbbs.com/thread-1614796-1-1.html (Source: HChuan Chemical Forum)
During the pre-startup pipe warming and machine heating process, steam condenses into water as soon as it comes into contact with cold surfaces. If this condensed water is not removed promptly, the fast-flowing steam can carry this water into the steam drum, thereby damaging the blades. Therefore, it is necessary to open the drain valve before starting up in order to remove the condensed water.
Warm the pipes to prevent water hammer; the steam turbine’s drain system is used to remove the condensed water from within the machine, thereby preventing water evaporation during acceleration and the occurrence of water hammer in the circulation cylinders and impellers!
During pre-startup pipe warming and machine heating, the steam is supercooled and immediately condenses into water. If the condensate is not drained in time, high-speed air currents will carry water into the cylinder and damage the blades.
During startup, when the pipes are warmed up and steam comes into contact with cold surfaces, it immediately condenses into water. If this condensed water is not removed in time, the high-speed steam can carry this water into the cylinders, resulting in water hammer effects; in severe cases, this can cause vibration in the turbine. Therefore, the drain valve must be opened before starting up.
Prevent condensate from entering the impeller and damaging the blades
1. During pipe and system warming before startup, the steam is supercooled and immediately condenses into water. 2. If the condensate is not drained in time, high-speed air currents will carry water into the cylinder and damage the blades.
Prevents water hammer, ensures more even heating of the pipes, and prevents equipment damage due to thermal stress
During pre-startup pipe warming and machine heating, the steam is supercooled and immediately condenses into water. If the condensate is not drained in time, high-speed air currents will carry water into the cylinder and damage the blades. Therefore, the water in the pipes must be drained completely before starting up.