Energy-saved circulating fluidized bed boiler

Abstract

The invention discloses an energy-saved circulating fluidized bed boiler, and belongs to the technical field of boiler equipment. The energy-saved circulating fluidized bed boiler comprises a hearth, a cyclone separator and a tail vertical shaft; and a superheater, a coal economizer and an air preheater are arranged in the tail vertical shaft. The energy-saved circulating fluidized bed boiler is characterized by further comprising a circulating sand ash blowing device; the circulating sand ash blowing device includes a sand hopper, an electric block, a sand blaster and a fluidized bed; the sand blaster includes a speed adjusting motor, a belt wheel, a transmission belt, a sand blasting pipe and a bearing connected to the sand blasting pipe; the sand hopper is connected with the sand blasting pipe through a sand inlet pipe; a motor shaft of the speed adjusting motor is in transmission connection with the belt wheel; the belt wheel is in transmission connection with the bearing through the transmission belt; the sand blasting pipe is communicated with the tail vertical shaft; the fluidized bed is connected with an auger driven through the motor; and the electric block is connected with a sand discharge cart. The energy-saved circulating fluidized bed boiler can effectively remove ash on a heat exchange part in the tail vertical shaft, improves the heat exchange efficiency, increases the boiler strength, and has the characteristics of low energy consumption, good ash blowing effect and high use safety.

Description

technical field [0001] The invention relates to the technical field of boiler equipment, in particular to an energy-saving circulating fluidized bed boiler. 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 with a light furnace wall. Eight s...

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Problems solved by technology

[0006] 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 it 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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