CN2417376Y - Universal type direct flowing coal powder combustion burner - Google Patents

Abstract

The utility model discloses a universal type direct flowing coal powder combustor. A is composed of three rows of louver sheets. One row of louver sheets is obliquely arranged in a channel on one side of the center line of a primary air tube. The other two rows of louver sheets are arranged in a primary air spout in the v-shaped symmetrical mode. The burner of the structure can realize that a combustor can steadily operate in the mode of complete deoiling under the condition of low load which is larger than or equal to 50%MCR, can save oil used for ignition and combustion supporting, and simultaneously, can adapt to boilers which combust different kinds of coal and the change of load to keep combustion stabilization and to improve combustion efficiency.

Description

Universal straight-through pulverized coal burner

Original straight-through pulverized coal burner boiler, generally under the situation that is lower than (70%MCR) load, instability will appear in burning, the flame-out phenomenon of blowing out happens occasionally, it is higher to use the frequency that the boiler combustion wild effect of anthracite, meager coal and soft coal takes place, and must come into operation and help fuel oil could guarantee the flameholding of boiler in a large number.

The technical data of the retrieval parties concerned is learnt, bluff body, hull, high speed difference same direction jet ... with novel burners such as dense, light burners, they are aspect saving ignition of the boiler and helping fuel oil, though obtained gratifying economic benefit, but all degree is different exists coking, wearing and tearing, plugging, burn out defectives such as spout and high temperature corrosion, therefore is difficult to keep the economical operation steady in a long-term of pulverized-coal fired boiler.Simultaneously in the above-mentioned all kinds of novel burner, still without any a kind of can adapt to various different coals and wide range load variations (〉=50%MCR), can also guarantee under high load capacity, not occur the hidden danger that wind snout such as is out of shape, burns out at the serious threat safe operation of the boiler simultaneously; Realize macrocyclic safely, the operation of stabilizing the economy of boiler.The purpose of this utility model will overcome above-mentioned deficiency exactly, and the boiler of realizing the different coals of burning can be kept macrocyclic safety and economic operation under the wide range varying load condition of 〉=50%MCR.

The purpose of this utility model is to realize like this, a kind of universal straight-through pulverized coal burner, it comprises breeze airflow spout and flameholder, it is characterized in that: flameholder mainly is made up of three row louvre blades, in the tilting wing passage of spout a distance one row louvre blade at an airduct center line, in addition two row louvre blades be in the shape of the letter V (interface that installs cooling air additional is left in the centre) be arranged in wind snout, under the ad hoc structure condition of this shutter shape flameholder, breeze airflow is after streaming the first row louvre blade, just two strands of coal powder densities and all different horizonally projected jet of pulverized coal particle component about being divided into, a side (side of the waring oneself in front of a fire) coal powder density that is unkitted louvre blade is big, particle is thick, forms thick, concentrated phase; The coal powder density of opposite side (the first row louvre blade behind) is low, particle is thin, form thin, light phase, suitably regulate the established angle between each row louvre blade and the spout horizontal center line, can make coal dust air two phase flow, after streaming the shutter shape flameholder, be formed with and be beneficial to pulverized coal concentration field, air-flow field and the temperature field that coal dust rapidly heats up and catches fire, form the stable ignition source of the breeze airflow that ignites.

The utility model has the advantages that: 1, simple in structure, installation and replacing flameholder are convenient, fast; 2, spout can coking, burn out; 3, pulverized coal particle is with only bumping between the blade, and it is little to slide relatively, and not easy to wear, resistance is also little, and power consumption increases little; 4, the burning fugitive constituent is V _Daf≤ 4.3% anthracite can be saved igniting and help fuel oil in a large number in the full de-oiling stable operation of underload (50%MCR) down long-time (more than 4 hours); 5, can adapt to burning different coals (especially anthracite, meager coal, soft coal) boiler and wide range load variations (〉=50%MCR), and guarantee under high load capacity, not occur a wind snout distortion, fault such as burn out.

Below in conjunction with accompanying drawing the utility model is further set forth:

Fig. 1 is a front view of the present utility model;

Fig. 2 is a top plan view of the present utility model;

Fig. 3 is work of the present utility model (steady combustion) principle schematic.

With reference to accompanying drawing 1,2, the utility model is made up of 1 airducts of spout, 2 shutter shape flameholders 3.In the tilting wing passage 4 of spout 1 a distance one row louvre blade at airduct 2 center lines, the in addition two row louvre blades arrangement that is in the shape of the letter V, be arranged symmetrically in wind snout, the interface that inserts cooling air is left on its top in the middle of all, and louvre blade adopts heat-resistance stainless steel or wear-resisting, heat resisting cast steel to make.

With reference to accompanying drawing 3, the air-flow (representing with arrow among the figure) that contains coal dust enters airduct 2 one time, after streaming the first row louvre blade of flameholder, forms two bursts of horizonally projected jets that coal powder density and pulverized coal particle component all differ greatly.Side behind the first row louvre blade is thin, light phase, and opposite side is thick, concentrated phase.These two strands of jets are streaming two row when being in the shape of the letter V the louvre blade of arranging, after gas powder impact blades, the difference of its velocity vector changes, and coal dust is accumulated near the spout two side gradually, and when flowing through last a slice blade, its pulverized coal particle concentration reaches maximum.When air-flow continues flow further downstream, the pulverized coal particle of high concentration region is under action of inertia, almost towards injecting burner hearth with the parallel direction straight line of spout center line, outer rim at jet forms local high coal powder density district 7, and entrainment fluid behind the blade during primary air flow further downstream, thereby reduced the static pressure behind the blade, produce a reverse pressure pressure gradient along the spout central axial direction, fluid downstream (flue gas) is able to reflux to two row blade symmetrical centre districts, because the low pressure of center, the both sides primary air converges by both sides primary air behind the segment distance to axis tilt, has formed and has streamed recirculating zone 5.Owing to be the high-temperature flue gas of coming that refluxes in the burner hearth in the recirculating zone, its speed is even, stable and very low, and primary air district speed is very high, therefore between main steam flow and recirculating zone strong DIFFUSION IN TURBULENCE taking place mixes, cause strong momentum, quality and exchange heat, the intensification that very helps breeze airflow is caught fire.Simultaneously the coal dust in local high coal powder density district 7 being able to intensification rapidly and catching fire because of being among the high-temperature flue gas and being subjected to the photothermy of burner hearth torch, forms stable flame 6 (ignition source), makes flameholding.Regulate the cooling air quantity that inserts on top and guarantee that boiler can not burn out spout at high load capacity or when using high-volatile bituminous coal, can full de-oiling flameholding when ature of coal becomes bad or underload (50%MCR).

The utility model straight-through pulverized coal burner can directly utilize former once airduct to realize, needn't change water screen tube, and industrial experiment shows that the utility model continues and successfully solved pulverized-coal fired boiler burning anthracite (V _Daf≤ 4.3%) under the 50%MCR operating mode, after the full de-oiling stable combustion problem,, realized burning bituminous coal (V on the 420T/H of Nanchang power plant boiler, using recently _Daf〉=25%) under 50%MCR load full de-oiling stable operation and at full capacity (100%MCR) down spout do not produce distortion, burn out the so far continuously safety and economic operation three wheat harvesting periods achievement of (now still using as a servant).

Claims (1)

1, a kind of universal straight-through pulverized coal burner, it comprises breeze airflow (airduct) spout and flameholder, it is characterized in that: flameholder is made up of three row louvre blades, one row louvre blade is tilting in a wing passage of an airduct center line, and in addition two row louvre blades are in the shape of the letter V and are symmetrically arranged in wind snout.

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