Large-speed-difference flue gas circulation and ultralow nitrogen oxide high-speed burner and control method thereof

Abstract

The invention relates to a large-speed-difference flue gas circulation and ultralow nitrogen oxide high-speed burner and a control method thereof. The burner is provided with a burner brick, an air, fuel gas and circulating flue gas inlet tube, a burner housing and a pre-combustion chamber, wherein the inner cavity of the burner brick is a combustion chamber; a fuel gas inlet end of the pre-combustion chamber is provided with a primary air inlet channel; the outlet of the pre-combustion chamber is provided with an air distributing disc; and a secondary air inlet channel is arranged on the airdistributing disc. While the burner works, fuel gas and flue gas is pre-mixed and combusted in the pre-combustion chamber. Through a two-stage air distribution way, a gas mixture sprayed out by the pre-combustion chamber and flow speed of combustion-supporting air sprayed out through the secondary air inlet channel define large speed difference, so that an air flow reflow region is made in the outlet area of the pre-combustion chamber; and the airflow reflow region guarantees stable fuel gas and complete combustion in a furnace kiln. According to the control method, circulating flue gas is notinput into the burner while the furnace temperature is lower than a temperature of 900 DEG C, circulating flue gas is input into the burner to participate in combustion while the furnace temperatureis higher than the temperature of 900 DEG C, the circulating flue gas reduces a fuel gas heat value and a high temperature point of combustion flames, and ultralow NOX emission is realized.

Description

technical field [0001] The present invention relates to a high-speed burner with large speed difference flue gas circulation and ultra-low nitrogen oxides and its control method, in particular to a combustion device and its control technology for metallurgical kilns using gas as fuel, such as A high-velocity difference flue gas circulation ultra-low nitrogen oxide high-speed burner used in heat treatment furnaces, heating furnaces and other combustion devices and a control method thereof. Background technique [0002] my country's nitrogen oxide emission standards for the iron and steel industry are becoming increasingly stringent, requiring new (including relocated) iron and steel projects across the country to reach ultra-low emission levels in principle, and at the same time vigorously promote the ultra-low emission transformation of existing iron and steel enterprises. At present, the heat treatment furnaces and heating furnaces in my country's metallurgical furnaces mai...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is in order to solve the combustion device NO of the metallurgical kiln existing in the prior art X Problem with high emissions, especially NO when using natural gas X To solve the problem of high emissions, provide a simple structure, large speed difference flue gas circulation ultra-low nitrogen oxide high-speed burner that can ensure stable combustion and complete combustion of fuel, and can achieve ultra-low nitrogen oxide emissions during kiln operation control method

Images