Chute coal feeder for circulating fluidized bed boiler

Abstract

The invention discloses relates to a boiler coal feeder and aims to provide a chute coal feeder for a circulating fluidized bed boiler. The chute coal feeder is used for solving the problems that an existing spiral coal feeder is easily clamped and is short in conveying distance and high in abrasion, the coal is frequently blocked, and a coal lack phenomenon cannot be judged; the coal lack phenomenon of a scraping plate coal feeder cannot be judged, parts such as a scraping plate is rapidly worn and easily clamped, and chains are easily broken; parts of a belt coal feeder are corroded by a large quantity of corrosive water vapor accumulated in the belt coal feeder due to the backward fleeing of smoke, and when a fleeing phenomenon is serious, a belt can be burnt, moist caking coal is produced, the belt is easily diverged, and cleaning chains easily malfunction. The chute coal feeder is characterized in that fuel coal of a feed coal hopper is controlled to fall onto a chute by a coal quantity regulation mechanism, a vibration device is mounted on the chute and is used for controlling the vibration amplitude and the frequency so as to control the flux of the coal in the chute, a plug board valve is mounted on the chute and is used for controlling the thickness of a coal layer in the chute and conveying the fuel coal to a connecting coal hopper through the chute, an electric air-lock device is mounted below the connecting coal hopper and is used for regulating the quality of the fuel coal through a (forward-backward rotation) adjustable-speed motor, and the fuel coal enters a hearth through a tubular gate which is provided with a ring seal and arranged below the electric air-lock device so as to be burnt. By utilizing the chute coal feeder, the fuel coal of the circulating fluidized bed boiler can be stably and reliably fed, and various accidents caused by the feeding problem of the fuel coal are avoided.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler coal feeder Background technique [0002] In order to meet the needs of power generation, production steam and heating, there are a large number of circulating fluidized bed boilers in operation in my country. The current coal feeders for circulating fluidized bed boilers mainly include spiral coal feeders, scraper coal feeders, and belt coal feeders, all of which are fully enclosed and pressure-resistant. The phase positive pressure zone must be sealed in order to prevent smoke from blowing out, and the coal supply air and coal broadcast air must be used to feed coal. The shortcomings of the three coal feeders are obvious: the spiral coal feeder is easy to get stuck, the coal is blocked frequently, it is impossible to judge whether the coal is broken, the conveying distance is short, and the wear is large; the scraper type coal feeder is also unable to judge whether the coal is broken or scr...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a chute coal feeder for circulating fluidized bed boilers to solve the problem that existing spiral coal feeders are prone to jamming, frequent coal blocking, inability to judge whether coal is broken, short conveying distance, and wear and tear. Large; the scraper type coal feeder cannot judge whether the coal is broken, the scraper and other parts wear quickly, the chain is easy to break, and the phenomenon of jamming is easy to occur; the belt type coal feeder can be weighed, and from this point it can be indirectly judged whether it is broken or not. Coal, but a large amount of corrosive water vapor caused by the backflow of flue gas accumulates in the coal feeder, causing the parts of the coal feeder to corrode too quickly. also often fails

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