Coal thermal decomposition grate firing apparatus and its combustion method

Abstract

The invention relates to a coal pyrolysis layer combustion device and the combustion method thereof, including that the furnace body interior of the first layer combustion furnace is divided into an upper oxidation pyrolysis chamber and a lower fire grate layer combustion chamber which is communicated with each other; the coal and desulfurizer are mixed to be fed into the middle part of the oxidation pyrolysis for oxidation pyrolysis through a hopper; the generated combustible gas and the smaller semi-coke particles are overflowed through the upper-connected through port or are carried in the airflow to be fed into the mechanical fire grate layer combustion chamber; the bigger semi-coke particles fall on the mechanical fire grate and are fed into the layer combustion layer for combustion; the mechanical fire grate layer combustion chamber is provided with a front arch and a back arch for organizing the airflow field inside the furnace; the coal pyrolysis layer combustion device and the combustion method thereof adopt the fluidization characteristics of the coal particles with different particle diameters and the high thermal capacity characteristic inside the oxidation pyrolysis chamber to realize the natural separation of the coal particles with different particle diameters and the rapid oxidation pyrolysis of coal, reduce the fire grate coal leakage loss and the incomplete combustion loss caused by the front segment low temperature of the fire grate and reduce the emission of the SOx and NOx pollutant through the combination of the pyrolysis desulfurization and the combustion desulfurization, and the reburning denitration formed by the coal pyrolysis product.

Description

technical field [0001] The invention belongs to the technical field of clean energy, and in particular relates to a coal pyrolysis layer combustion device and a combustion method thereof which can improve the combustion efficiency of a coal-fired industrial boiler and realize smokeless, low nitrogen oxide and sulfur oxide emissions. Background technique [0002] my country is rich in coal resources. In 2004, the proven coal reserves were 114.5 billion tons, accounting for about 87.4% of the proven reserves of conventional energy. The characteristics of "lack of oil, less gas, and rich coal" in my country's energy distribution and the low price of coal lead to the dominant position of coal in my country's energy consumption structure, and for a long period of time in the future, the basis of coal Energy status will not be shaken. There are about 530,000 coal-fired industrial boilers in my country, and their annual coal consumption accounts for about 1 / 3 of my country's annual...

AI Technical Summary

Problems solved by technology

However, since the fluidized bed pyrolysis furnace provided by this patent is located outside the hearth of the layer-fired furnace, the structure of the connecting conveying channel has a great influence on the fluidity of the semi-coke and the fluidization of the fuel in the fluidized bed. It is difficult to match with the combustion in the floor-burning furnace, especially for small-capacity floor-burning furnaces, the impact is more prominent

In addition, setting an external fluidized bed pyrolysis chamber will increase the volume and complexity of the overall equipment, so the economy and popularization of this patented technology are poor

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