Low-heating-value biomass semi-fluidized bed composite grate combustion furnace

Abstract

The invention discloses a low-heating-value biomass semi-fluidized bed composite grate combustion furnace which is technically characterized in that a feeding mechanism is arranged in the middle of a main bed combustion chamber; the water-cooled hearth is arranged at the lower part of the main bed combustion chamber, a high-pressure fan with an upward air outlet is arranged at the lower part of the water-cooled hearth, and the water-cooled hearth is connected with a slag fire grate at the rear end of the water-cooled hearth; an ash pushing mechanism and a combustion chamber gas sealing element which are fixed on the outer furnace wall of the main bed combustion chamber are arranged at the front end of the water-cooled hearth; an ash pushing plate which moves to the upper surface of the water-cooled hearth is arranged on the ash pushing mechanism; fuel is dried and ignited by high-temperature flue gas in the descending process and falls on the fire bed above the water-cooled hearth, then the falling material is blown by high-pressure air for secondary ignition, a new fire bed is formed after ignition, and the ignition and combustion problems of low-heating-value biomass are solved.

Description

technical field [0001] The invention belongs to the technical field of combustion furnaces, and in particular relates to a low calorific value biomass semi-fluidized bed composite grate combustion furnace. Background technique [0002] The existing combustion furnaces are roughly divided into three categories: one is the biomass fluidized bed boiler, which has the advantage of being able to burn biomass with a low calorific value and has high efficiency; The second is the biomass layer-fired reciprocating grate boiler, which has the advantage that it can burn biomass with a low melting point of ash and can stop the furnace at any time; the disadvantage is that it cannot burn biomass with a low calorific value, and the furnace efficiency is generally low. The third is the vibrating water-cooled hearth furnace, which has the advantage of burning biomass with low calorific value and low ash melting point; its disadvantages are high cost, low efficiency, and inability to miniatu...

AI Technical Summary

Problems solved by technology

[0002] The existing combustion furnaces are generally divided into three categories: one is the biomass fluidized bed boiler, which has the advantage of being able to burn biomass with low calorific value and high efficiency; the disadvantage is that it cannot burn biomass with a low melting point of ash and has poor variable load capacity

The second is the biomass layer-fired reciprocating grate boiler, which has the advantage that it can burn biomass with low ash melting point, and can stop the furnace at any time; the disadvantage is that it cannot burn biomass with low calorific value, and the furnace efficiency is generally low

The third is the vibrating water-cooled hearth furnace, which has the advantage of being able to burn biomass with low calorific value and low ash melting point; its disadvantages are high cost, low efficiency, and inability to miniaturize

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