Process for reducing coal consumption in coal fired power plant with steam piping drying

A process for reducing coal consumption in a coal fired power plant with steam-piping drying, comprising the steps of:

• weighing raw coal from a coal powder bunker of a coal fired boiler generating set by a weighing belt;
• feeding the weighed raw coal into an steam-piping drying system;
• extracting superheated steam from a fourth section or a fifth section of a steam turbine and feeding the superheated steam into the steam-piping drying system to dry the coal powder;
• feeding steam and noncondensable gas evaporated from the coal powder into a dust collector for removal of dust and discharging tail gas after removal of dust completely via a tail gas fan;
• feeding the dried coal powder into a coal grinding mill;
• condensing the superheated steam for drying into water, and feeding the condensed water into a condensate pot, enhancing the condensed water in pressure via a condensate pump, and then feeding the pressurized water into a deaerator;
• mixing the pressurized water with condensed water which has been heated by a multi-stage low pressure heater so as to be a boiler feed water with performing removal of oxygen together;
• feeding the boiler feed water into a fifth high pressure heater, a sixth high pressure heater, and a seventh high pressure heater via a feed water pump in turn and reheating the boiler feed water by heating medium from extraction steam of a third section, a second section, and a first section of the steam turbine;
• and
• feeding the reheated boiler feed water into a coal economizer so as to be further heated in the boiler system, feeding the further heated boiler feed water into a steam drum for steam-liquid separation so as to be saturated steam, discharging the saturated steam from the steam drum, and feeding the saturated steam into a superheater of the boiler, heating the saturated steam into superheated steam in the superheater of the boiler, and feeding the superheated steam into the steam turbine for generating electricity so as to perform a Rankine cycle.