Combustion device for upper spraying, combustion, exhumation and outflow of premixed annular airflow

Abstract

The invention relates to a combustion device for upper spraying, combustion, exhumation and outflow of premixed annular airflow, which effectively solves the problems that gas and blasting air rapidly combust in the combustion chamber after flowing into the premixing loop and the gas flow in the flue flow field is uniform and stable. The combustion device is a combustion chamber which consists of a dome cylinder type lower opening, a cylinder type wall body and a semi-spherical dome and is used for flow and combustion of premixed gas flow, a gas loop and an air loop are separately arranged along the vertical direction in the inner wall of the cylinder type wall body, the periphery of the inner side of the gas loop is uniformly provided with gas nozzles with rectangular sections, and the periphery of the inner side of the air loop is uniformly provided with air nozzles with rectangular sections; the outer sides of the gas loop and the air loop are respectively connected with a gas inlet pipe and an air inlet pipe; the spouts of the gas nozzles and the air nozzles are vertically communicated with the outer side of a premixing loop; and the premixing loop is an annular loop with the upper opening on the rectangular section of the combustion chamber and is tightly and coaxially connected with the inner wall of the combustion chamber. The invention has the advantages of low manufacturing and installation difficulty and high stability, and can reduce the excess air coefficient, enhance the combustion intensity and increase the combustion temperature.

Description

1. Technical field [0001] The invention relates to a gas fuel combustion device, in particular to a premixed annular airflow upward injection combustion and turning back outflow combustion device, which is used as a combustion device in industrial heating hot blast stoves and industrial kilns. 2. Background technology [0002] The burner is an indispensable core device for combustion industrial furnace equipment. Its performance and structure directly affect the fuel utilization rate, thermal efficiency, and whether it meets the requirements of energy saving and environmental protection. At present, as far as the combustion process of low calorific value gas (such as blast furnace gas and producer gas) is concerned, its mixed combustion modes can be divided into three types: diffusion combustion (long flame combustion), semi-premixed combustion, and premixed combustion (short flame combustion). In terms of its development trend, premixed combustion makes it the main directio...

AI Technical Summary

Problems solved by technology

However, looking at the existing gas burners, there are still problems such as complex burner structure, uneven distribution of combustion airflow, and poor controllability of combustion airflow, which lead to problems such as incomplete combustion or unstable combustion, and poor thermal load regulation performance. Appear

At the same time, the complex structure often leads to structural damage to the burner

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