Low-nitrogen combustion device and method for plasma ignition self-sustaining stable combustion

Abstract

The invention discloses a low-nitrogen combustion device and method for plasma ignition self-sustaining stable combustion. The low-nitrogen combustion device is characterized in that a stable combustion cavity is formed inside a combustion device main shell body, and a combustor nozzle communicating with the stable-combustion cavity is formed in one end of the combustion device main shell body; a stable combustion ring is arranged inside the stable combustion cavity; a primary air pipe communicates with the stable combustion ring, a secondary air pipe communicates with the stable combustion cavity, and the primary air pipe is connected with a plasma ignition device; a stable combustion ring inlet is formed in the end, close to the plasma ignition device, of the stable combustion ring, and a stable combustion ring outlet is formed in the end, close to the combustor nozzle, of the stable combustion ring; a first backflow area is arranged on the side, close to the stable combustion ring inlet, of the stable combustion cavity, and a second backflow area is arranged on the side, close to the stable combustion ring outlet, of the stable combustion cavity; and heat flow sprayed out from the stable combustion ring outlet of the stable combustion ring flows to the first backflow area through the second backflow area, and the heat flow flowing to the first backflow area enters the stable combustion ring through the stable combustion ring inlet to form heat flow circulation. According to the low-nitrogen combustion device, the plasma ignition device can be turned off after pulverized coal combustion reaches the stable combustion condition, and the stable combustion state can be continuously maintained for a long time.

Description

technical field [0001] The invention relates to the technical field of pulverized coal ignition, in particular to a plasma ignition self-sustained stable combustion low-nitrogen combustion device and method. Background technique [0002] Industrial boilers are important thermal power equipment in my country's production and life, of which more than 80% are coal-fired boilers, with an annual coal consumption of nearly 640 million tons. There are many specifications and varieties of coal-fired industrial boilers in my country, and the furnace types are different. For a long time, the thermal efficiency of coal-fired industrial boilers in China is generally low due to the low level of automation, large changes in load operation, high heat loss due to incomplete mechanical combustion, large excess air coefficient, and unstable coal quality. serious pollutant emissions. [0003] In the prior art, coal-fired industrial boilers use oil-fired ignition technology, which is difficul...

AI Technical Summary

Problems solved by technology

[0004] For this reason, the present invention provides a plasma ignition self-sustaining stable combustion low-nitrogen combustion device and method, which can turn off the plasma ignition device after the stable combustion of pulverized coal, and can continue to maintain a stable combustion state for a long time, solving the problem of plasma ignition in the prior art. High energy consumption and high cost caused by continuous operation of the device

Images