Boiler chain grate and tending zero-emission biomass chain boiler

Abstract

The invention provides a boiler chain grate. The boiler chain grate comprises a grate shell and a grate main body, wherein five inter-independent air chambers are formed in parallel in the grate shell; two front air boxes and two back air boxes are symmetrically arranged outside both sides of the grate shell; air inlets in both sides of the front three air chambers are connected with the two front air boxes, respectively; air inlets in both sides of the back two air chambers are connected with the two back air boxes, respectively; the front air boxes are provided with front air inlets; the back air boxes are provided with back air inlets. The invention further provides a tending zero-emission biomass chain boiler, wherein an upper header, a lower header, an upper boiler barrel and a lower boiler barrel are arranged in a boiler body; a hearth, a flue gas radiation chamber, a flue gas convection box and a smoke exhaust box are arranged in the boiler body; an air preheater is arranged in the smoke exhaust box. The boiler chain grate is arranged at the bottom of the hearth. Primary air is blown into the front air boxes and the back air boxes after being preheated by the air preheater through front air box fans and back air box fans, and enters the air chambers to support combustion. Secondary air is applied to combustion supporting from the front and back of the hearth after being preheated by the air preheater. The boiler chain grate and the tending zero-emission biomass chain boiler have the characteristics of high thermal efficiency and low waste gas emission.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a chain boiler fueled by biomass and a chain grate in the boiler. Background technique [0002] Existing a kind of biomass boiler such as application number is the Chinese patent disclosure of 200810137245.3, and it comprises boiler body and screw feeder, and boiler body has base, front wall, rear wall, front arch and rear arch, and the base of boiler There is a chain grate on the top of the chain grate, and an air chamber is arranged on the chain grate. The screw feeder is set outside the boiler body to supply biomass fuel to the chain grate. There is a secondary air nozzle on the front arch of the boiler, and the secondary air nozzle The outer sequential pipe is connected with an air volume regulating valve. During the operation of this kind of boiler, air is supplied from the air chamber of the chain grate to the furnace, which is usually called primary air. Burning on fire;...

AI Technical Summary

Problems solved by technology

During the operation of this kind of boiler, air is supplied from the air chamber of the chain grate to the furnace, which is usually called primary air. Burning on fire; the air is supplied from the secondary air nozzle on the front arch to the furnace, which is usually called secondary air. The main function of the secondary air is to supplement the air needed for combustion, so as to facilitate the complete combustion of the fuel suspended in the furnace. The combination of primary and secondary air promotes the full combustion of biomass fuel, which has a positive effect on improving the thermal efficiency of the boiler and reducing exhaust emissions. However, the fuel on the grate is roughly divided into two sections according to the combustion situation. It is fuel that has just entered the furnace and has not been ignited or fully burned. The rear section of the grate is mostly burnt ash mixed with incompletely burned fuel. The front section and the rear section of the grate have different requirements for primary air. The primary wind does not have a difference based on this air supply, so it needs to be optimized and improved

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