【Daily Question No. 297】10.30.2018
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【Daily Question No. 297】October 30, 2018: Briefly describe the effects of excessively high or low inlet steam temperature on the operation of a steam turbine. Too low a steam inlet temperature causes many small water droplets to form in the steam flowing into the turbine. These tiny water droplets strike the turbine blades at extremely high speeds, causing erosion of the blades and vibration in the turbine; in severe cases, this can lead to the breakage of the blades. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
If the steam temperature exceeds the design value, although this is advantageous from an economic perspective, it is not permissible from a safety standpoint. At high temperatures, the mechanical properties of metals decline rapidly, which reduces the service life of various components in the turbine, such as control valves, nozzles and blades in the speed stages and pressure stages, shaft seals, and bolts. It may also cause the impeller casings in the earlier stages to become loose. Therefore, an excessively high steam inlet temperature is not allowed. A steam temperature lower than the design value increases the blade reaction degree, thereby increasing the axial thrust. Operating at too low a temperature increases steam consumption and affects economic efficiency. Furthermore, a decrease in steam temperature will cause water erosion in the latter stages of blades in condensing steam turbines, reducing their service life
A steam inlet temperature higher than the design value is advantageous from an economic perspective, but it is not permitted from a safety standpoint. Because at high temperatures, the mechanical properties of metals decline rapidly, which reduces the service life of various components in the turbine, such as throttle valves, nozzles and blades in the speed stages and the first few pressure stages, shaft seals, and bolts. It may also cause the earlier stages of the impeller assembly to become loose. Therefore, an excessively high steam inlet temperature is not allowed. A steam inlet temperature lower than the design value increases the blade flutter amplitude, thereby increasing the axial thrust. Operating at excessively low temperatures increases steam consumption and affects economic efficiency. Furthermore, a decrease in the inlet steam temperature will cause water erosion in the latter stages of blades in condensing steam turbines, shortening their service life.
Too low a steam inlet temperature causes many small water droplets to form in the steam flowing into the turbine. These tiny water droplets strike the turbine blades at extremely high speeds, causing erosion of the blades and vibration in the turbine; in severe cases, this can lead to the breakage of the blades.
A steam temperature higher than the design value is advantageous from an economic perspective, but it is not acceptable from a safety standpoint. ①Because at high temperatures, the mechanical properties of metals decline rapidly, which reduces the service life of various components in the turbine, such as throttle valves, nozzles and blades in the speed stages and the first few pressure stages, shaft seals, and bolts. It may also cause the earlier stages of the impeller assembly to become loose. Therefore, an excessively high steam inlet temperature is not allowed. ②A steam temperature lower than the design value increases the blade reaction degree, thereby increasing the axial thrust. Operating at excessively low steam temperatures increases steam consumption and affects economic efficiency. Furthermore, a decrease in steam temperature will cause water erosion of the blades in the latter stages of a condensing steam turbine, reducing its service life.
Too low a steam inlet temperature causes many small water droplets to form in the steam flowing into the turbine. These tiny water droplets strike the turbine blades at extremely high speeds, causing erosion of the blades and vibration in the turbine; in severe cases, this can lead to the breakage of the blades.
A steam inlet temperature higher than the design value is advantageous from an economic perspective, but it is not permitted from a safety standpoint. Because at high temperatures, the mechanical properties of metals decline rapidly, which reduces the service life of various components in the turbine, such as throttle valves, nozzles and blades in the speed stages and the first few pressure stages, shaft seals, and bolts. It may also cause the earlier stages of the impeller assembly to become loose. Therefore, an excessively high steam inlet temperature is not allowed. A steam inlet temperature lower than the design value increases the blade flutter amplitude, thereby increasing the axial thrust. Operating at excessively low temperatures increases steam consumption and affects economic efficiency. Furthermore, a decrease in the inlet steam temperature will cause water erosion in the latter stages of blades in condensing steam turbines, shortening their service life.
A steam temperature higher than the design value is advantageous from an economic perspective, but it is not acceptable from a safety standpoint. ①Because at high temperatures, the mechanical properties of metals decline rapidly, which reduces the service life of various components in the turbine, such as throttle valves, nozzles and blades in the speed stages and the first few pressure stages, shaft seals, and bolts. It may also cause the earlier stages of the impeller assembly to become loose. Therefore, an excessively high steam inlet temperature is not allowed. ②A steam temperature lower than the design value increases the blade reaction degree, thereby increasing the axial thrust. Operating at excessively low steam temperatures increases steam consumption and affects economic efficiency. Furthermore, a decrease in steam temperature will cause water erosion of the blades in the latter stages of a condensing steam turbine, reducing its service life.
A steam inlet temperature higher than the design value is advantageous from an economic perspective, but it is not permitted from a safety standpoint. Because at high temperatures, the mechanical properties of metals decline rapidly, which reduces the service life of various components in the turbine, such as throttle valves, nozzles and blades in the speed stages and the first few pressure stages, shaft seals, and bolts. It may also cause the earlier stages of the impeller assembly to become loose. Therefore, an excessively high steam inlet temperature is not allowed. A steam inlet temperature lower than the design value increases the blade flutter amplitude, thereby increasing the axial thrust. Operating at excessively low temperatures increases steam consumption and affects economic efficiency. Furthermore, a decrease in the inlet steam temperature will cause water erosion in the latter stages of blades in condensing steam turbines, shortening their service life.
Too low a steam inlet temperature causes many small water droplets to form in the steam flowing into the turbine. These tiny water droplets strike the turbine blades at extremely high speeds, causing erosion of the blades and vibration in the turbine; in severe cases, this can lead to the breakage of the blades.
Too low a steam inlet temperature causes many small water droplets to form in the steam flowing into the turbine. These tiny water droplets strike the turbine blades at extremely high speeds, causing erosion of the blades and vibration in the turbine; in severe cases, this can lead to the breakage of the blades.