Gas injection ultra-low NOx fuel dilution technology regenerative burner

Abstract

A regenerative burner of the gas injection ultralow-NOx fuel dilution technology comprises a hollow burner shell internally provided with a heat accumulator, an air and gas mixing head, an air opening formed in the front end of the burner shell, a baking brick, a gas pipe and an ignition burner. A first combustion chamber is arranged in the air and gas mixing head. The regenerative burner further comprises a smoke discharge main pipe, a backflow smoke pipe and a mixed gas pipe. One end of the mixed gas pipe is arranged in the burner shell and communicates with the first combustion chamber, and the other end of the mixed gas pipe is arranged outside the burner shell and communicates with one end of the backflow smoke pipe. The other end of the backflow smoke pipe communicates with the smoke discharge main pipe. One end of the gas pipe is connected with an injector. A gas inlet is formed in the other end of the gas pipe. One end of the smoke discharge main pipe is connected with the air opening, and the other end of the smoke discharge main pipe is connected with a smoke discharge chimney. According to the regenerative burner, smoke is made to flow back by injecting fuel through the injector at a high speed, and therefore the concentration of the fuel is decreased, the heat value of the fuel is decreased, the combustion temperature of flame is directly lowered, and the ultralow NOx emission amount is achieved.

Description

technical field [0001] The invention relates to the technical field of regenerative burners, in particular to a regenerative burner with gas injection ultra-low NOx fuel dilution technology. Background technique [0002] As early as the mid-nineteenth century, the regenerative combustion technology was applied, but due to its large area occupied by the regenerator, long reversing time, and complicated operation, it was gradually replaced by other combustion technologies. It was not until the 1980s that the miniaturization of the regenerator and the shortening of the reversing time made the regenerative combustion technology develop to a certain extent. 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 regenerativ...

AI Technical Summary

Problems solved by technology

However, since the regenerator heats the combustion-supporting air or gas to a high temperature, and as the preheating temperature of the combustion-supporting air or gas increases significantly, the flame combustion temperature will also increase, making the NOx produced during the combustion process rise exponentially. exacerbated the pollution of the air environment

[0003] Conventional flue gas circulation technology generally adopts the method of circulating flue gas into the combustion-supporting air. However, due to the low exhaust temperature of the regenerative burner, generally at 150-200°C, the flue gas must be circulated into the combustion-supporting air. Re-absorbing the heat of the regenerative body will greatly reduce the energy-saving effect of the regenerative combustion technology, and the flue gas circulation volume in the way of circulating flue gas to the combustion-supporting air must be large to achieve the effect of reducing NOx, making the cost of the circulating fan rapidly increase

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