Novel heat accumulating type flat flame burner

Abstract

The invention discloses a novel heat accumulating type flat flame burner comprising a hollow burner shell internally provided with a heat accumulating body, a flat flame burner brick, an air inlet, an ignition burner body, a burner core and an air-fuel mixing head. A flat flame combustor of a horn-shaped gradually-wider structure is arranged at one end of the flat flame burner brick. The air-fuel mixing head is provided with primary air channels which are distributed along the outer edge of a gas pipe circumferentially and are gathered together towards the direction of a burning pipe shaft core. The flat flame burner brick is provided with secondary air channels which are distributed along the outer edge of the flat flame combustor circumferentially, are scattered radially and evenly from the burner shell to the direction of a hearth, and correspond to the horn-shaped gradually-wider structure of the flat flame combustor. The primary combustion-supporting air volume accounts for about 30%-50% of the total volume, and the secondary combustion-supporting air volume accounts for 50%-70% of the total volume. According to the novel heat accumulating type flat flame burner, special air staged rotational flow technology is adopted, the condition that flame forms a flat flame shape is not influenced, meanwhile, the oxygen content during burning is diluted, the burning temperature of the flame is lowered, and thermal NOx generated during burning is reduced greatly.

Description

technical field [0001] The invention relates to the field of burners, in particular to a novel regenerative flat flame burner. Background technique [0002] At present, due to the shortage of energy in the world and the non-renewability of energy, in order to save energy and reduce production costs, regenerative combustion technology has been widely promoted and applied in heat treatment furnaces. The working principle of the regenerative combustion technology is: the regenerative burners are arranged in pairs, using the regenerator as the carrier, alternately heated by the heat of the exhaust gas, and then the heat stored in the regenerator is used to heat the air or gas. The heating body periodically heats and releases heat to preheat the air or gas to a high temperature, which not only ensures the continuity of the furnace heating but also achieves the effect of energy saving. [0003] With the country's increasing emphasis on environmental protection, the energy saving ...

AI Technical Summary

Problems solved by technology

At present, domestic heat treatment furnaces and heating furnaces generally use regenerative burners for energy saving, but most regenerative flat flame burners on the market emit NOx below 8% oxygen when the furnace temperature is 1200°C and the preheating temperature is 1000°C. The content is about 700-1000ppm, which is much higher than the national NOx emission standard of 150ppm when the oxygen content is 8%, which does not meet the national environmental protection requirements

The use of regenerative burners causes the temperature of the combustion air to rise sharply, leading to an increase in the flame combustion temperature, and the thermal NOx generated during the burner combustion process also doubles. Although energy is saved, it does not meet environmental protection indicators and causes serious pollution. surroundings

The distance between the primary combustion air and the secondary combustion air is relatively close when the conventional regenerative flat flame burner uses air staged combustion, and the distribution of the primary and secondary combustion air is not appropriate, so that the smoke generated after the primary combustion is immediately separated from the Mixed combustion of secondary air, the effect of reducing NOx is not obvious

Due to the particularity of the flame shape of the regenerative flat-flame burner, in order to avoid burning the workpiece, it is necessary to form a flame close to the furnace wall. In this way, in order to avoid destroying the integrity of the regenerative burner flame, some conventional NOx reduction measures cannot Applied to regenerative flat flame burners

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