The steam water system of the boiler  generally includes the tail-end economizer, boiler drum, water cooling system, air cooled cyclone separator inlet flue, air cooled cyclone separator, HRA wall enclosure superheater, low temperature superheater, platen superheater, high temperature superheater and connection pipe. Low temperature reheater, panel reheater and connection pipe.

Boiler feed water firstly is introduced from both sides of the economizer inlet header, and will upstream enter the economizer outlet header via the economizer tubes group horizontally arranged, and will enter the boiler drum through the economizer extraction tube. At the start-up stage that no enough quantity of water is continuously supplied to the boiler drum, the economizer recirculation piping can be used for introducing the boiler water to the inlet header from the boiler drum, in order to prevent stagnation and vaporization of the water in the economizer tube.

The water circulating in boiler is in centralized water supply, and decentralized leading-in and leading-out. The water supply enters to the middle of boiler water, and will enter the water cooling wall and water-cooled partition inlet header via the centralized downcomer and the water connecting pipe. The boiler water is heated to become mixture of steam and water while it flows upward through water-cooled wall and water-cooled partition wall of the chamber, and will enter to the boiler drum for steam and water separation through the upper part outlet headers and via steam-water inlet and outlet pipe, the separated water will enter the boiler drum water space and will recycle, the separated saturated steam will be guided from the steam connecting pipe at top of the boiler drum.

After the saturated steam is guided by the boiler drum, it will be introduced by saturated steam connecting pipe to the upper header at the inlet flue of steam cooled cyclone separator and will be downward introduced to the annular lower header of steam cooled cyclone separator via the connecting pipe, after it upward enters to the cooler separator drum, it will be guided to the enclosure wall upper header at both sides of the tail vertical shaft from the upper header of the separator via the connecting pipe. It will downward enter the lower header of both sides enclosure wall via the cooling both sides enclosure wall, and will be introduced to the lower header of the front the rear header by the enclosure wall connecting pipe. Then it will upward enter the upper header of the middle enclosure wall for combination, and downward enter the lower header of the middle enclosure wall, namely the low-temperature superheater inlet header. It will upstream cool the low-temperature superheater group of the flue and will be introduced from the connecting pipe of both sides of the boiler to the inlet header of the platen super heater in front of the boiler, after it flows through the heating surface of the platen super heater, will go to the high-temperature superheater in the flue for tail-end vertical shaft, at last the qualified saturated steam comes from both sides of the high super heater outlet header and enters to the high-pressure cylinder of the steam turban.

The exhaust steam from the high-pressure cylinder of the steam turbine enters the low-temperature reheater inlet header in front of the tail-end vertical shaft via the steam connecting pipe and will flow through two groups of low-temperature reheater, and will be guided by the outlet header of the low-temperature heater, and will enter to the header of the platen reheater inlet in front of the boiler via the connecting pipes at both sides of the boiler, then it will upstream enter the platen reheater arranged in the boiler, the qualified steam from the reheater will go to the middle-pressure cylinder of the steam turbine from the both sides of the outlet header of the platen reheater at the upper part of the chamber.    (lsh)