主蒸汽压力变化影响（Influence of main steam pressure change）.docVIP

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主蒸汽压力变化影响（Influence of main steam pressure change）.doc

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主蒸汽压力变化影响（Influence of main steam pressure change）

主蒸汽压力变化影响（Influence of main steam pressure change） 1., the main steam pressure rise, the main impact on the operation: When the main steam temperature is constant, the main steam pressure rises, the enthalpy drop of the whole unit increases, and the operation economy increases. But when the main steam pressure increases beyond the limits of the specified range, it will directly threaten the safety of the unit, mainly in the following points: (1) the steam humidity increases at the end of the unit, which worsens the working conditions of the last moving blades, and the water erosion is severe. (2) increasing the enthalpy drop of the regulating stage will lead to the overload of the regulating stage rotor blades. (3) the stresses in the main steam pressure components will increase, which will shorten the service life of the components, and may cause deformation of these parts so as to damage the parts. Handle： (1) when the main steam pressure rises to 13.23MPa, contact the boiler to recover the main steam pressure and report the value to a long value; (2) when the main steam pressure rises to 13.72MPa, the value shall be reported immediately, and measures shall be taken to restore normal and to make a record of the delay time. 2., the main steam pressure reduction, the main impact on the operation: (1) when the main steam temperature is constant, the main steam pressure decreases, the enthalpy drop of the whole unit decreases, and the operation economy decreases. (2) the main steam pressure is reduced, if the valve opening is unchanged, the amount of steam entering the turbine decreases, the stress levels of leaves will be reduced, the axial thrust will be reduced, the unit power will increase with flow rate decreases. No effect on the safety of the unit. (3) main steam pressure is reduced if the unit issued by the power is not reduced, even to a rated power, it will make the whole machine steam flow exceeds the rated value, if the pressure of each monitoring section