Ash removing device for deposited ash for boiler bellows

Abstract

The invention discloses an ash removing device for deposited ash for boiler bellows. The ash removing device comprises ash removing plates, ash removing holes, detection tracks, detectors, and an ashcollecting device, wherein the ash removing plates are arranged below a burner in the same layer in the bellows; each ash removing plate is provided with an ash removing hole being adjustable to closeand open, and used for allowing falling down of ash; the detection tracks are used for being jointed to the side walls of the bellows and respectively extent along the length direction and the thickness direction of the dust removing plates; each detector for detecting the height of deposited ash on the upper surface of the corresponding ash removing plate is in sliding connection to the inner part of the corresponding detection track; the ash removing holes are in communication when the height of the deposed ash obtained by the corresponding detector is greater than preset height; and the ash collecting device for collecting ash falling down from the ash removing holes is arranged below the ash removing plate at the bottom of the bellows. According to the ash removing device for deposited ash for boiler bellows, the ash removing holes are used for realizing communication and disconnection of cavities of the bellows above the ash removing plates with the ash collecting device, the condition that during an ash removing operation, the ash removing device for deposited ash for boiler bellows has a large ash removing area, can be guaranteed, improvement of ventilation resistance of secondary air is also avoided, and the ash removing device has the characteristics of being high in reliability, low in energy consumption and high in feasibility.

Description

technical field [0001] The invention relates to the field of boilers, in particular to an ash removal device for boiler air boxes. Background technique [0002] A coal-fired boiler is a thermal device that uses the heat released by the combustion of pulverized coal to heat the working medium water to a certain parameter steam. The air required for the combustion of pulverized coal in the furnace enters the furnace through the secondary wind box. During the actual operation, the fly ash formed by the combustion of pulverized coal will be partially deposited in the regenerator covered with corrugated plates in the rotary air preheater. When the secondary air flows through the heat storage body, it will carry the fly ash attached and deposited here into the bellows. As the circulation area of ​​the secondary air in the bellows increases, the wind speed decreases, resulting in a decrease in the ability of the secondary air to carry fly ash, and part of the fly ash is deposited ...

AI Technical Summary

Problems solved by technology

The former ash removal method has high energy consumption and low efficiency, and there is a large ash removal dead zone; because the degree of ash accumulation and whether ash accumulation cannot be detected, the ash removal operation is blind, resulting in a further increase in energy consumption

The latter also cannot judge the degree of ash accumulation, and the ash removal operation is blind; the working environment of the solenoid valve and the globe valve in the high temperature and high dust environment is harsh, easy to jam, and low in reliability

In addition, for the latter, due to the large size of the ash collecting hopper, it is generally only installed in the bottom burner air box, and cannot be installed in the middle and upper layer air boxes, which will affect the ash removal effect in various places in the air box

Although it can be installed in the bellows on the bottom, middle and upper layers respectively, the ventilation area of ​​the bellows is reduced due to the small-sized ash collecting hopper with an air locker, which increases the flow resistance of the secondary air, which is not conducive to the flow of the secondary air, thus aggravating Solved the problem of fly ash deposition in the bellows

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