Air supply structure of oil gun under bed of circulating fluidized bed boiler

Abstract

The invention provides an air supply structure of oil gun under the bed of a circulating fluidized bed boiler. The air supply structure ensures a reasonable combustion position in an ignition cylinder so as to guarantee the normal operation of a steel plate on the end face of the ignition cylinder and a fire-resistant material on the lower part of the inner side of the ignition cylinder, and ensures uniform combustion and efficiency of the ignition cylinder when the air quantity is small. The technical scheme is that: the air supply structure comprises the ignition cylinder, the steel plate on the end face of the ignition cylinder and an air inlet mechanism of a tee structure. The air inlet mechanism of the tee structure comprises an air inlet channel, an oil inlet pipe and an outlet straight pipe and is characterized in that: a center sleeve is sleeved at the end of the oil inlet pipe under the air inlet channel; a front closing plate and a rear closing plate are sleeved on the two end faces of the center sleeve respectively; the outer circle surfaces of the front closing plate and the rear closing plate are attached to the inner circle surface of the outlet straight pipe; and a vent through-hole is formed on the front closing plate.

Description

technical field [0001] The invention relates to the field of internal mechanical mechanisms of a circulating fluidized bed boiler, in particular to the air supply structure of an oil gun under the bed of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boiler combustion technology is a coal-fired technology developed in the past 20 years. It has outstanding advantages such as wide fuel adaptability, high combustion efficiency, low nitrogen oxide emissions, large load regulation ratio and fast load regulation. Since the emergence of circulating fluidized bed combustion technology, circulating fluidized bed boilers have been widely used in the world. At present, most circulating fluidized bed boilers use light diesel oil under the bed to start ignition. This ignition method High heat utilization rate, safe, simple and fast, but the air inlet structure of the oil gun is a simple three-way structure, its structure see figure 1 , ...

AI Technical Summary

Problems solved by technology

Since the emergence of circulating fluidized bed combustion technology, circulating fluidized bed boilers have been widely used in the world. At present, most circulating fluidized bed boilers use light diesel oil under the bed to start ignition. This ignition method High heat utilization rate, safe, simple and fast, but the air inlet structure of the oil gun is a simple three-way structure, its structure see figure 1 , figure 2 , which includes an air inlet 1, an oil inlet pipe 2, an ignition tube 3, and an ignition tube end steel plate 4, and the combustion air is easy to form during operation such as figure 1 and figure 2 The flow direction of the flame causes the flame to deviate downward during the combustion process, causing the underside of the steel plate 4 on the end surface of the ignition tube to burn red, and at the same time, the refractory material at the lower part of the inner side of the ignition tube 3 is easily scoured and burned by the flame, resulting in qualitative change; Under the low load condition of the oil gun, due to the small air volume, the speed of the air flow through the oil gun is low, and the flame is prone to backflow, resulting in low efficiency and even the danger of fire extinguishing

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