Gas firing or oil firing boiler using thin flameless burning mode

Abstract

A gas or oil boiler working in thin-flameless combustion mode is disclosed. The outlets of the air delivering tub and the primary fuel tube in said air delivering tube are surrounded by a pre-burning hood. Several cyclone tubes are arranged from said pre-burning hood to combustion box. Several secondary fuel tubes have their inlets connected via fuel flow controller to fuel supplying tube and their outlets extended in combustion box. The thin combustion takes place in said pre-burning hood and the flameless combustion is formed in the combustion box.

Description

Technical field: [0001] The invention belongs to the technical field of combustion equipment boilers, and particularly relates to a gas-fired or oil-fired boiler adopting a lean-flameless combustion method. Background technique: [0002] "Boiler Principles and Calculations" (edited by Feng Junkai and Shen Youting, Science Press, 1992, pp. 60-64) introduces the principle of burning gas in boilers, and mentions that the burner outlet will form a flame or a torch. "Structural Design and Atlas of Oil-fired and Gas-fired Boilers" (edited by Zhao Qinxin et al., Xi'an Jiaotong University Press, 2002, pp. 54-56) introduces the internal structure and working methods of modern vertical shell-type oil-fired gas boilers, and also mentions The burner outlet will form a flare or flare. The problem with these boilers is that the combustion reaction takes place in a small and limited area due to the presence of the flare or flare, and on the one hand, there is a high temperature zone at th...

AI Technical Summary

Problems solved by technology

The problem with these boilers is that the combustion reaction takes place in a small limited area due to the presence of the flare or torch, on the one hand, there is a high temperature zone at the flare or torch where the atmospheric pollutant nitrogen oxides (NO x ) emissions are quite large, which cannot be ignored. On the other hand, the combustion is not sufficient, the temperature in the furnace is not uniform, and the thermal efficiency needs to be improved.

In this way, a combustion stirred reactor that occupies a large furnace space is required, the length of which is not less than 70% of the length of the furnace, and the cross-sectional area accounts for 50%-90% of the cross-sectional area of ​​the available space of the furnace. The cost is relatively high; secondly, it takes about 1 hour for the process from ignition and combustion to when the temperature of the combustion stirring reactor reaches 850°C and enters the flameless combustion state, which takes a long time, which is especially unfavorable for boilers with a short single operation time

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