Anthracite-combusted single fire ball four-corner direct current burner

Abstract

An anthracite-combusted single fire ball four-corner direct current burner includes four burner groups placed at the four corners at a hearth and at least one coal pulverizer, wherein the pulverized coal airflow sprayed by the burner groups forms an imaginary tangent circle at the center of the hearth; two groups of burners are vertically arranged at each burner group at intervals; four pulverized coal pipelines are arranged at the outlet of each coal pulverizer and are connected to four concentrated / thin pulverized coal separators correspondingly; the separated four ways of concentrated pulverized coal airflow is transferred to four primary air / concentrated pulverized coal nozzles on the same horizontal plane and at the lower parts of the four corners of the hearth; and the separated four ways of thin pulverized coal airflow is transferred to four primary air / thin pulverized coal nozzles on the same horizontal plane and at the upper parts of the four corners of the hearth. Under the premise of meeting the heat power of the entire boiler, the anthracite-combusted single fire ball four-corner direct current burner increases the pulverized coal concentration at the concentrated pulverized coal area, and enables the wall thermal load qHr at the lower part of the burner to be higher, thereby enabling the combustion temperature at the lower part of the burner to meet the requirement of inflammation and stable combustion for the anthracite, and guaranteeing the anthracite pulverized coal airflow to be combusted timely and the low-load stable combustion of the oilless boiler.

Description

technical field [0001] The invention relates to a pulverized coal combustion device, in particular to a single-fireball four-corner direct-flow burner for burning anthracite. Background technique [0002] my country's proven coal reserves are about 640 billion tons, of which low-volatile anthracite accounts for about 14.6% of the total coal reserves. my country's thermal power plants use anthracite coal for about 3% of the total coal used for power generation, and this figure is still increasing. Anthracite has low volatile content, low hydrogen content, high ignition temperature, and slow flame propagation speed. If the combustion organization is not good, it is prone to unstable low-load combustion, and when the coal quality deteriorates, the boiler is prone to flameout under high load. Combustion efficiency is also generally lower. [0003] At present, W flame boilers, four-corner tangential combustion boilers, and opposite swirling combustion boilers with front and rea...

AI Technical Summary

Problems solved by technology

However, for the hot air powder feeding system in the intermediate storage, since the maximum output of the domestic steel ball mill is about 50t / h, for units of 600MW and above, each furnace needs to be equipped with 6 to 8 mills. The system itself is relatively complicated, and the huge The pulverized coal warehouse makes the design and layout of the design institute more difficult and occupies a larger area

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