Staged combustion paired independent combined type ultralow NOx dual-heat-storage burner

Abstract

The invention discloses a staged combustion paired independent combined type ultralow NOx double-heat-storage burner, and belongs to the field of thermal engineering. The problems that according to an existing left-right staggered double-heat-storage burner, local thermal stress is prone to being generated, burner bricks are broken, and the service life is affected are mainly solved. Nozzles are formed in an air nozzle burner block and a gas nozzle burner block of the burner, the center lines of the nozzles and the center line of an air heat storage box, as well as the center lines of the nozzles and the center line of a gas heat storage box form spraying angles respectively, and the directions of the nozzles in the air nozzle burner block and the gas nozzle burner block are arranged in an inverted splayed shape. Generation of NOx in the combustion process is effectively restrained, oxidation and decarburization of steel billets in the heating process are avoided, oxidation burning loss is reduced, the heating quality of the steel billets is improved, a furnace wall refractory castable thermal expansion seam is conveniently reserved in a narrow space between the air gas regenerative chamber and the gas regenerative chamber, and the service life of the burner block is longer.

Description

technical field [0001] The invention relates to a staged combustion and pair-combined ultra-low NOx double regenerative burner for a heating furnace or a heat treatment furnace, belonging to the field of thermal engineering. Background technique [0002] In the design and installation of existing double regenerative burners for heating furnaces, the rear end face of the burner brick is fixed on the front end of the double regenerative burner body, and the front face is flush with the refractory castable of the furnace wall, and refractory materials are poured around the burner brick , because the burner bricks are relatively large and the burners are closely arranged, only one column of anchor bricks can be arranged between the burner bricks. Considering that the furnace wall refractory castable expands at high temperature, it is necessary to install a 5-way anchor brick between the burner bricks. ~10mm thermal expansion joint, due to the partition effect of the thermal expa...

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Problems solved by technology

[0002] In the design and installation of existing double regenerative burners for heating furnaces, the rear end face of the burner brick is fixed on the front end of the double regenerative burner body, and the front face is flush with the refractory castable of the furnace wall, and refractory materials are poured around the burner brick , because the burner bricks are relatively large and the burners are closely arranged, only one column of anchor bricks can be arranged between the burner bricks. Considering that the furnace wall refractory castable expands at high temperature, it is necessary to install a 5-way anchor brick between the burner bricks. ~10mm thermal expansion joint, due to the partition effect of the thermal expansion joint, the anchor brick fixed on the steel plate of the furnace wall cannot play the role of pulling the burner brick by anchoring the refractory castable, causing the heating furnace or heat treatment furnace to run for a period of time. Under the stress of thermal expansion and the erosion of air flow, the mouth brick tilts into the furnace, and even causes production accidents such as the collapse of the furnace wall

In addition, when designing and installing the existing dual regenerative burners, the left and right staggered layout of the air and gas regenerative burner nozzles makes the entire heating section burn in a whole section. Usually, the heating furnace or heat treatment for each heating There are 6-10 pairs of double regenerative burners in the section to form a whole. During the production process, one pair of burners failed and could not be put into use, resulting in the failure of other regenerative burners in the entire heating section. This heating section can be shut down, causing the entire furnace to shut down or maintain low-load production

The existing left and right staggered double regenerative burners, air and gas regenerative burner nozzles adopt rectangular flat openings, and the burner bricks work in the high-temperature zone of the furnace for a long time, which is prone to local thermal stress, which will cause the burner bricks to break and affect the use life

At the same time, the air and gas regenerative burner nozzle adopts a rectangular nozzle structure, and the air and gas are not mixed sufficiently in the furnace, resulting in poor furnace temperature uniformity and NO in the flue gas. X Phenomena such as excessive emissions

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