THERMAL CIRCUIT OF SUPERCRITICAL PRESSURE POWER UNIT UNLOADING

摘要

FIELD: heat power engineering.;SUBSTANCE: invention relates to heat engineering and can be used at thermal power plants equipped with steam turbine units, mainly for their operation in variable operating modes with extended control power range. Thermal circuit of supercritical pressure power unit unloading comprises three high pressure heaters (HPH) connected to steam lines of the first, second high pressure part (HPP) steam extractions of steam turbine (ST) and third extraction of part of medium pressure (MPP) ST respectively, and at least one deaerator connected to the steam pipeline of the fourth MPP ST steam extraction. Circuit has common for all said HPH cascade removal of condensate of heating steam in at least one deaerator, and between the first and third HPH there is an additional steam line connecting steam pipelines of the first and third steam extraction and having installed on it: a shutoff gate valve, a check valve and a control valve.;EFFECT: invention ensures preservation of cascade drain of condensate of heating steam from all three HPH into deaerator with transfer of the third HPH to power from the first HPP ST steam extraction, disconnection from the third MPP ST steam extraction and storage of power supply of TPN drive with the third steam extraction at deep unloading of ACS unit less than 40 % of capacity from rated value.;1 cl, 1 dwg