A circulating ash removal method suitable for fluidized bed boilers

Abstract

The invention discloses a circular ash removing method suitable for a fluidized bed boiler, and belongs to the technical field of ash removal of boiler equipment. The circular ash removing method suitable for the fluidized bed boiler comprises a sand loading step and a recycling step, and is characterized in that in the sand loading step, sand is loaded in a sand hopper of a circular sand ash blower; in a sand blasting step, the sand in the sand hopper is placed in a sandblast, and is sprayed in a shaft at the tail by the sandblast; in the recycling step, after scouring a superheater, an economizer and an air pre-heater, the sand sprayed in the shaft at the tail flows into a fluidized bed of the circular sand ash blower, and is recycled via an auger connected to the fluidized bed; and in a sand lifting step, the sand recycled by the auger is elevated and moves to a position above the sand hopper through an electric hoist, and is discharged into the sand hopper through a sand discharging trolley to form a circular ash removal cycle. By the circular ash removing method suitable for the fluidized bed boiler, the sand can be circularly used to remove ash on a heat exchange component in the shaft at the tail, the heat exchange efficiency is improved, and boiler steam rate is increased. The circular ash removing method suitable for the fluidized bed boiler has the features of low energy consumption and good ash removal effect.

Description

technical field [0001] The invention relates to the technical field of ash removal for boiler equipment, in particular to a circulating ash removal method suitable for fluidized bed boilers. Background technique [0002] The circulating fluidized bed boiler adopts a single drum and natural circulation mode, and is generally divided into two shafts at the front and the rear. The front shaft is a general suspension structure, surrounded by membrane water cooling walls. From bottom to top, it is the primary air chamber, dense phase area, and dilute phase area. The tail shaft adopts a supporting structure, and the two shafts are connected by a vertical cyclone separator, and the lower part of the separator is connected with a return device and an ash cooler. The interior of the combustion chamber and the separator are equipped with anti-wear linings, the front shaft is equipped with an Ao tube furnace wall, an external metal guard plate is used, and the tail shaft is equipped ...

AI Technical Summary

Problems solved by technology

The high-efficiency energy-saving two-speed circulating fluidized bed boiler disclosed in this patent document is ventilated through the primary air duct and the secondary air duct. Although it can blow away part of the ash particles adhering to the air preheater, it is difficult to blow to the air preheater. The soot in the center of the tube bundle of these heat exchange components is not completely blown, and the soot blowing effect is poor, which affects the heat exchange efficiency, resulting in low output and low efficiency of the entire circulating fluidized bed boiler

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