Eddy flow powdered coal burner lit up by tiny oil

Abstract

This invention relates to a wall-laid little oil ignition coal burner including a primary air pipe, a central air pipe, a high energy oil gun set horizontally in the central air pipe, inlet for inner secondary wind, an inlet for outer secondary wind, spouts of primary wind and secondary wind and a spout of a burner characterizing in setting one stage or multiple stages of diversion condensed rings on the internal wall of the primary air pipe and setting one or multiple stages of precombustion chamber at the front of the central pipe, which realizes four-stage ignition process with tiny oil and higher oil-saving rate when adjusting the peak deeply and has the function of stable and low NOx burning when the oil gun stops working.

Description

technical field [0001] The invention relates to a micro-oil ignition swirl pulverized coal burner, in particular to an oil-less ignition technology of a wall-shaped pulverized coal burner, which belongs to the field of combustion technology and equipment technology. Background technique [0002] Power plant boilers consume a large amount of fuel oil during ignition and low-load stable combustion. As oil prices continue to rise and resources become increasingly tight, reducing this part of oil consumption has become an urgent task to achieve economical operation of power plant boilers. Although my country has always attached great importance to the fuel saving of coal-fired power plant boilers and used a variety of burners with good combustion stability, to a considerable extent, only conventional large oil guns with an output of more than 600kg / h are used, and the boiler startup and low-load operation The amount of fuel used is still huge. It is estimated that the average f...

AI Technical Summary

Problems solved by technology

Although the primary wind is concentrated as in the Chinese patent application 95219971.8, the oil gun flame needs to directly ignite the whole primary air flow; and although the oil gun flame is limited in a small pre-combustion cylinder in the Chinese patent application 01279824. The primary wind to be ignited has not been concentrated

(2) Use the primary air elbow as the gas-solid separator to separate the primary air from thick to thin, as in patent 200610053092.5, or use an external thick and thin separation device. The system is relatively complicated and limited by space, such as patent applications 03284850.1 and 200520145352.2

Especially for the swirl burners with tangential air inlet for the primary air, such as the swirl burners of Foster Wheeler (FW) in the United States and IHI in Japan, the primary air pipe is connected vertically upwards from the pulverizing system to There is no elbow at the burner inlet, and it is very difficult to install an external gas-solid separator

(3) Another common feature of the prior art is that only one air powder flow is introduced into the oil flame stabilization chamber (or pre-combustion chamber). When the operating conditions or coal types change, only the oil gun can be relied on. The ignition characteristics are adjusted by itself, and the adjustment ability is limited

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