Intermediate reheating small-capacity split axle type steam-turbine generator set

Abstract

An intermediate reheating small-capacity split axle type steam-turbine generator set comprises a reheating boiler with the evaporation capacity of 410t / h-120t / h and two double-circulation communicated steam turbines with the capacity of 120MW-15MW, wherein each steam turbine is provided with a matched generator. The mature high parameter backpressure steam turbine and medium and low-pressure parameter steam turbine technologies are utilized, the existing small-capacity single-axle type steam turbine is split into double-axle steam turbines, one set of high parameter steam turbine is changed into a high parameter backpressure turbine and a medium and low-pressure parameter rear turbine, and at the same time, a set of large-capacity generator is changed into two small-capacity generators. After change, the two steam turbines are separately arranged, the problem that pipelines cannot be arranged caused by adopting a reheating technology by a small-capacity unit is systematically solved; after axle splitting, generating shaft systems of the two steam turbines both become short, the stability of the shaft systems is favorably increased; after cylinder splitting, the power of each steam turbine becomes small, and the axial unbalanced force borne by a thrust bearing is favorably reduced.

Description

technical field [0001] The invention belongs to the field of power generation of a small-capacity turbo-generator set in the thermal power generation industry, and specifically relates to an intermediate reheating small-capacity split-shaft turbo-generator set. Background technique [0002] In the thermal power industry, the intermediate reheating turbogenerator unit is only used when the unit capacity is 125MW or above. In the past, due to the limitation of manufacturing level, manufacturing cost and fuel cost, for small-capacity units, it is generally used to increase the main steam temperature and pressure parameters to improve thermal efficiency. Generally speaking, when the steam pressure is increased by 1MPa, the heat consumption rate of the unit can be reduced by 0.13% to 0.15%; when the main steam temperature is increased by 10°C, the thermal efficiency of the unit can be increased by 0.25% to 0.3%. The current parameters of units below 125MW are Ultra-high pressure ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low power generation efficiency of the existing small-capacity turbo-generator system, the present invention provides an intermediate reheat small-capacity split-shaft turbo-generator set, which includes a reheating unit with an evaporation capacity of 410t / h-120t / h Boiler, double cycle connected with two steam turbines with a capacity of 120MW-15MW, and each steam turbine is equipped with a matching generator

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