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

Abstract

A single-fireball four-corner direct-flow burner for burning anthracite, including four burner groups placed on the four corners of the furnace, the pulverized coal flow injected by it forms an imaginary tangent circle in the center of the furnace; each burner group has vertical There are two sets of burners arranged at intervals; it also includes at least one pulverized coal mill, and four pulverized coal pipes installed at the outlet of each pulverized coal mill are connected to four thick-lean separators; the separated four-way thick pulverized coal The air flow is sent to the four primary air / concentrated coal powder nozzles on the same horizontal plane at the lower part of the four angles of the furnace; the separated four-way light coal powder air flow is sent to the four primary air / Light coal powder nozzle. On the premise of meeting the thermal power of the whole boiler, the present invention increases the coal powder concentration in the dense coal powder area, so that the heat load qHr of the wall surface in the lower burner area is higher, so that the combustion temperature in this area can meet the requirements of anthracite ignition and stable combustion , to ensure the timely ignition of the anthracite pulverized gas flow and the stable combustion of the boiler without oil and low load.

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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