Wide-load efficient turbine generator set with switchable partial cylinders

Abstract

The invention relates to a wide-load efficient turbine generator set with switchable partial cylinders. The turbine set is connected with a boiler, a heater and a condenser separately and comprises high pressure cylinders, intermediate pressure cylinders and low pressure cylinders which are sequentially connected, the high pressure cylinders are connected with a main steam pipeline of the boiler,a cold reheat steam pipeline of the boiler and the heater respectively, the high pressure cylinders comprise a switching high pressure cylinder and a reserve high pressure cylinder, and the intermediate pressure cylinders comprise a switching intermediate pressure cylinder and a reserve intermediate pressure cylinder; when the load is higher than a set threshold, steam simultaneously enters tall the cylinders for work; when the load is lower than the set threshold, the switching high pressure cylinder is switched; and the switching intermediate pressure cylinder and a switching low pressure cylinder are switched. Compared with the prior art, the wide-load efficient turbine set has the advantages that the cycle efficiency under partial load is improved, wide-load efficient and economic operation of the turbine set is realized and the like.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a wide-load high-efficiency turbogenerator set with removable cylinders. Background technique [0002] The steam distribution methods of steam turbine units in thermal power plants are mainly divided into two categories: full-circle steam inlet throttling adjustment and partial steam inlet nozzle adjustment. Since the full-circle steam inlet unit has no adjustment stage, the efficiency of the high-pressure cylinder is relatively high. In the newly built super ( This method has begun to be used in supercritical units. For this type of unit, it is most economical to use high-pressure valve full-open sliding pressure operation, but at medium and low loads, the main steam pressure drops a lot after sliding pressure operation, often operating in the subcritical area, and does not give full play to the super (Ultra)critical units should have the characteristics of cleanliness a...

AI Technical Summary

Problems solved by technology

Although the main steam pressure can be increased by closing the high-pressure valve, the gain outweighs the gain due to the increased throttling loss of the valve and other reasons.

The reduction of the initial parameter of the main steam pressure under low and medium loads leads to a significant decrease in cycle efficiency and a large increase in the coal consumption rate of power supply

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