Slag sorting device

Abstract

The invention discloses a slag sorting device suitable for selective discharge and cooling of slag of a circulating fluidized bed boiler, which comprises a sorting chamber, a slag inlet, an air return reverting port and the like. The slag sorting device is technically characterized in that: the sorting chamber and a boiler furnace share a membrane wall to form a compact integrated structure; the peripheral and top walls of the sorting chamber are formed by stretching and bending the membrane wall of the boiler furnace and welding flat steel; the bottom of the sorting chamber is provided with sorting chamber air distributing plates provided with a coarse slag discharging pipe; the bottom of the membrane wall between the sorting chamber and the boiler furnace is provided with the slag inlet; and a joint of the top wall of the sorting chamber and the boiler furnace is provided with a fine ash reverting port or the center of the top of the sorting chamber is provided with a reverting exhaust pipe. The slag sorting device has a simple structure, has the functions of sorting the coarse and fine slag and recovering fine particles, can adjust the amount and particle size of the fine particles returning to the boiler furnace in a large range, preliminarily cools the slag, discharges the slag at an intermediate temperature, and reduces the requirement on the output of subsequent slag cooling equipment.

Description

technical field [0001] The invention relates to a boiler slag discharge device, which is suitable for selective discharge and cooling of circulating fluidized bed boiler slag. Background technique [0002] Circulating fluidized bed combustion technology has developed rapidly in my country due to its advantages of wide fuel adaptability and low pollutant emission level, and has become the best way to comprehensively utilize low-quality fuels such as coal gangue and stone coal. Coal gangue and stone coal have high hardness and are difficult to break, resulting in a large particle size of coal entering the furnace, a small content of fine particles in the furnace, and a correspondingly small concentration of fine particles in the dilute phase area, which makes the difference between the load of the boiler and the wear of the heating surface intensified contradictions. Therefore, for circulating fluidized bed boilers burning low-quality fuels such as coal gangue, in order to en...

AI Technical Summary

Problems solved by technology

[0004] Existing slag discharge devices, such as water-cooled cone valves, L-shaped slag discharge valves, stepped plate slag discharge valves, etc., are only material conveying devices for discharging boiler slag from the furnace to the slag cooling equipment, and basically cannot recover fine particles in the slag , no cooling effect

Among the existing slag cooling devices, the mechanical slag cooler represented by the drum slag cooler has no fine ash recovery function, and has certain limitations when the boiler uses coal gangue and other inferior fuels; while the fluidized bed cooler Although the slag container has a certain fine ash recovery capacity and can recover part of the fine particles in the slag, the adjustable range of the fluidization air volume is small, and the adjustment range of the return ratio of fine particles is limited, which cannot meet the needs of the furnace for fine particles

Images