【Q&A Question 177】2018.07.01
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【Q&A Question 177】July 01, 2018: Briefly describe the hazards of operating a steam turbine under overload conditions. 1. Due to the increased steam inflow, the bending stress on the blades increases ； At the same time, the stresses experienced by the partitions and stationary blades, as well as the deflections they induce, also increase ； 2. As the steam inflow increases, the axial thrust rises, which leads to an increase in the temperature of the thrust bearing bushes; in severe cases, this can result in the destruction of these bearing bushes ； 3. When the opening degree of the speed control valve reaches a position close to its limit, the hydraulic actuator also reaches near its maximum stroke, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, leading to reduced stability in operation. (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. The APP short-video skills competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
1. Due to the increased steam inflow, the bending stress on the blades increases； At the same time, what is exerted on the partitions and stationary blades
Due to the increased steam inflow, the bending stress on the blades increases； At the same time, the load on the partitions and stationary blades
1. Due to the increased steam inflow, the bending stress on the blades increases； At the same time, the stresses experienced by the partitions and stationary blades, as well as the deflections they induce, also increase ； 2. As the steam inflow increases, the axial thrust rises, which leads to an increase in the temperature of the thrust bearing bushes; in severe cases, this can result in the destruction of these bearing bushes ； 3. When the opening degree of the speed control valve reaches a position close to its limit, the hydraulic actuator also reaches near its maximum stroke, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, leading to reduced stability in operation.
(1) As the steam inlet volume increases, the bending stress on the blades increases; simultaneously, the deflection caused by the stresses acting on the diaphragms and stationary blades also increases； (2) As the steam inflow increases, the axial thrust rises, which raises the temperature of the babbitt in the thrust bearings; in severe cases, this can lead to the destruction of those bearing components ； (3) When the opening degree of the speed control valve approaches its limit, the hydraulic actuator also reaches near its maximum travel distance, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, resulting in reduced stability of operation
Overloading a steam turbine can cause harm: (1) As the amount of steam supplied increases, the bending stress on the blades rises, and at the same time, the deflection caused by the stress on the diaphragms and stationary blades also increases； (2) As the steam inflow increases, the axial thrust rises, which raises the temperature of the babbitt in the thrust bearings; in severe cases, this can lead to the destruction of those bearing components ； (3) When the opening degree of the speed control valve approaches its limit, the hydraulic actuator also reaches near its maximum stroke, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, leading to a decline in operational stability.
Overloading a steam turbine can cause harm: (1) As the amount of steam supplied increases, the bending stress on the blades rises, and at the same time, the deflection caused by the stress on the diaphragms and stationary blades also increases； (2) As the steam inflow increases, the axial thrust rises, which raises the temperature of the babbitt in the thrust bearings; in severe cases, this can lead to the destruction of those bearing components ； (3) When the opening degree of the speed control valve approaches its limit, the hydraulic actuator also reaches near its maximum stroke, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, leading to a decline in operational stability.
(1) Due to the increased steam inflow, the bending stress on the blades increases； At the same time, the stresses experienced by the partitions and stationary blades, as well as the deflections they induce, also increase. (2) As the steam inlet volume increases, the axial thrust rises, which raises the temperature of the thrust bearing bushings; in severe cases, this can lead to the destruction of those bearing bushings. (3) When the opening degree of the speed control valve reaches a position close to its limit, the hydraulic actuator also reaches near its maximum stroke, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, resulting in poorer stability of operation.
(1) As the steam inlet volume increases, the bending stress on the blades increases; simultaneously, the deflection caused by the stresses acting on the diaphragms and stationary blades also increases； (2) As the steam inflow increases, the axial thrust rises, which raises the temperature of the babbitt in the thrust bearings; in severe cases, this can lead to the destruction of those bearing components ； (3) When the opening degree of the speed control valve approaches its limit, the hydraulic actuator also reaches near its maximum stroke, which deteriorates the performance of the speed control system. Both the rate of speed variation and the lag rate increase, leading to a decline in operational stability.
1. Due to the increased steam inflow, the bending stress on the blades increases； At the same time, the stresses experienced by the partitions and stationary blades, as well as the deflections they induce, also increase ； 2. As the steam inflow increases, the axial thrust rises, which leads to an increase in the temperature of the thrust bearing bushes; in severe cases, this can result in the destruction of these bearing bushes ； 3. When the opening degree of the speed control valve reaches a position close to its limit, the hydraulic actuator also reaches near its maximum travel distance; this leads to a deterioration in the performance of the speed control system. Both the rate of speed variation and the lag rate increase, resulting in poorer stability in operation