Pulverized coal decoupling combustor and decoupling combustion method thereof

Abstract

The invention relates to a pulverized coal decoupling combustor and a decoupling combustion method thereof. The decoupling combustor comprises a first-stage air duct (12), an inertia separator (11), air current conduits and a spout which are sequentially connected along the air current direction, wherein the air current conduits comprise a dense side air current conduit (7) and a fresh side air current conduit (8); the fresh side air current conduit (8) is communicated with a third-stage spout (1); the dense side air current conduit (7) is connected with a first-stage spout (3); a second-stage spout conduit (6) communicated with the dense side air current conduit (7) is led out of a pipeline between the dense side air current conduit (7) and the first-stage spout (3) on the dense side aircurrent conduit (7); the second-stage spout conduit (6) is communicated with a second-stage spout (2); the first-stage spout (3) is a gradually-increasing spout; a pair of pulverized coal collecting flame stabilizing devices (4) is oppositely arranged at the upper side and the lower side inside the front end of the first-stage spout (3); the cross sections of the pulverized coal collecting flame stabilizing devices (4) along the air current direction is gradually increased; and the area of the cross section of an air current channel is decreased along the air current direction, thus the coupling combustion is realized.

Description

technical field [0001] The invention relates to the field of pulverized coal combustion equipment, in particular, the invention relates to a pulverized coal decoupling burner and a decoupling combustion method thereof. Background technique [0002] In the practical application of pulverized coal combustion, with the increase of the combustion temperature and oxygen concentration of the pulverized coal-air mixture in the combustion stage, the pulverized coal is more likely to be burned quickly and fully, and the fly ash combustibles (unburned carbon and CO ) content is reduced; at the same time, high temperature oxygen enrichment will make the NO produced in the combustion process x On the other hand, the lower the combustion temperature and oxygen concentration of the pulverized coal-air mixture in the combustion stage, the better the suppression of nitrogen oxides NO x Generated, but coal dust is less likely to burn out. Therefore, the removal of fly ash combustibles and ...

AI Technical Summary

Problems solved by technology

However, these patents are only suitable for layered combustion technology, and only suitable for layered decoupling combustion furnaces below 100t / h, and it is difficult to realize large-scale decoupling combustion furnaces for pulverized coal combustion

[0008] The patent "Low NOx emission pulverized coal decoupling burner and pulverized coal decoupling combustion method" (China Invention Patent Application No.: 201110033811.8) invented a pulverized coal decoupling burner and pulverized coal decoupling combustion method, the coal Powder concentration and stable combustion are an integrated structure, and the dense and light nozzles are also arranged in a centralized manner. The separation performance of the pulverized coal concentration of this burner structure cannot be adjusted. In addition, the installation space of the boiler burner needs to have a fixed size space, which is not suitable for the dispersion of multiple nozzles. Arranged Furnace Structure

Images