[Guess what Haichuan Equipment] Why does the compressor turbine need to undergo an overspeed trip test?
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Before the steam turbine test run, the project department carefully planned and organized all aspects of the operation, dispatched technical personnel to set up a test run team, and prepared a test run plan. Before the test run, the project department repeatedly inspected the lubricating oil, cooling water, instrument air and other systems, conducted safety and technical risk disclosures for the operators, implemented the test run plan item by item, and confirmed the test run conditions, so that the steam turbine test run could proceed smoothly. Ningxia Baofeng Energy’s 600,000 tons/year olefins project includes 2.2 million tons/year coke gasification to methanol and 600,000 tons/year methanol to olefins. The methanol-to-olefins plant was put into production in October 2019. The coal-to-methanol equipment has been installed and is currently being debugged. It is planned to put the methanol project into production at the end of May this year.
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This post was last edited by Yuyu in the Desert on 2020-3-17 11:11
DCS system, interlocking function.
Conventional protocols require that “steam turbine rotors should undergo high-speed dynamic balancing tests before leaving the factory. Each steam turbine rotor shall undergo an overspeed test at the manufacturer. The overspeed test shall be conducted at a speed exceeding 102% of the maximum calculated speed. During the overspeed test, the turbine can run at 112% of the rated speed for less than 2 minutes without causing damage to any components, and the vibration of each bearing does not exceed the alarm value." After checking the specifications, the definition of "maximum calculated speed" is: It is assumed that the maximum speed that may occur if the governor fails and the maximum speed is limited only by the operation of the overspeed trip device. Then there are the following questions: 1. How to determine the speed of the overspeed test? If according to the definition, the test speed should be carried out at a speed of 102% of the speed after the impact sub-action, taking into account the dynamic rise of the rotor. Then the test speed is at least the rated speed * (111-112)% * 102%. 2. If the above is true, the agreement requires that "during the overspeed test, the turbine can operate at 112% rated speed for less than 2 minutes without causing damage to any components, and the vibration of each bearing will not exceed the alarm value." How should we understand it? Its running time is inconsistent with the following specifications. 3. Compare the requirements of "GB/T5578-2007 Specifications for Steam Turbines for Stationary Power Generation": The duration of the overspeed test should not exceed 2 minutes and can only be conducted once. Regardless of the reason, the overspeed test should not exceed 120% of the rated speed (not applicable to non-forged rotors) ； “DLT892-2004 Power Station Steam Turbine Technical Conditions" Requirements: The duration of the overspeed test should not exceed 10 minutes and can only be conducted once. If the normal setting value of the overspeed trip is 110% of the rated speed, the overspeed test should not exceed 120% of the rated speed. 4. As mentioned above, there is a contradiction in the overspeed test time between the two specifications. Which one should be implemented? 5. In addition: The national standard requires that "regardless of the reason, the overspeed test should not exceed 120% of the rated speed (not applicable to non-forged rotors)." How to understand? So what should be the requirements for non-forged rotors? Does it not apply to the entire clause, or does "the overspeed test should not exceed 120% of the rated speed" not apply, and it can be exceeded?
I actually found a related discussion on the forum about the speed requirements for the overspeed test of the new steam turbine rotor. https://bbs.hcbbs.com/thread-1135520-1-1.html (Source: Haichuan Chemical Forum Network)