CN201852090U - Large-sized high-efficient pulverized coal burner - Google Patents

Abstract

The utility model discloses a large-sized high-efficient pulverized coal burner, which is provided with a hearth, an automatic igniting device, a burner nozzle mechanism, an air flue and a hearth rotating mechanism. The automatic igniting device is located in the burner nozzle mechanism and extends into the hearth, the burner nozzle mechanism consists of a powder inlet pipe, an air and powder mixture channel, a primary air cyclone blade and a burning stabilizing disc, the air and powder mixture channel is a structure with the two large ends and the small middle, the air flue which is an involute volute special-shaped air tube is directly connected with a fan and is communicated with a secondary air channel and a tertiary air channel, which are arranged at the rear end of the hearth, via a combustion supporting channel, the secondary air channel is located on the inner side of the inner wall of the hearth, the cyclone blade is disposed in the secondary air channel, and the tertiary air channel is arranged on the outer wall side of the hearth. Compared with the prior art, the large-sized high-efficient pulverized coal burner has the advantages of reasonable structure, high burning efficiency, fast temperature rise, stable burning and long service life under high-burning intensity, and can be widely applied to large-sized asphalt stirring equipment higher than LB 3000 types.

Description

A kind of large-scale efficient coal burner

Technical field:

The utility model belongs to coal powder burning technology field, is specifically related to a kind of large-scale efficient coal burner.

Background technology:

The energy resource structure of China is oil-poor rich coal, and coal-fired replacement fuel oil has been a kind of development trend.In recent years on the asphalt mixing plant below the LB3000 type, the coal burner of oil burner has progressively appearred replacing, but its performance is not very stable: the easy slagging scorification of burning furnace chamber, the easy scaling loss of refractory material, the sustainability of stove is poor under incomplete combustion, the high combustion intensity, makes production instability and frequent maintenance cause and uses inconvenience.Therefore on the large-scale asphalt mixing plant more than the LB3000 type, seldom use basically.Along with the development that national highway is built, the large-scale asphalt mixing plant that matches with high grade pavement has welcome development at full speed, and with the supporting burner of this main equipment all be oil burner basically.Along with the variation of oil price, this large-scale oil burner its in the heating process of asphalt mixing plant sandstone material, fuel cost is more and more high, unit in charge of construction presses for a kind of lower-cost, burner with high efficiency of suitable national energy structure.

The utility model content:

At the present situation of above-mentioned pulverized coal combustion, the purpose of this utility model provides a kind of efficiency of combustion height, heats up rapidly, flameholding and the large-scale efficient coal burner of long service life under high combustion intensity.

For achieving the above object, the technical solution adopted in the utility model is: this large-scale efficient coal burner, have burner hearth, automatic ignition device, burner mechanism, air channel and burner hearth rotating mechanism, it is in-house that automatic ignition device is positioned at burner, and stretch into burner hearth inside, the Wear-resistant, high-temperature resistant rubber seal of burner mechanism and shaft, burner hearth places on the burner hearth rotating mechanism, it is characterized in that: described burner mechanism is made of powder inlet pipe, wind powder mixture passage, wind swirl vane and steady combustion dish, and described wind powder mixture passage is the structure of being small at both ends and big in the middle; Described air channel is that the special-shaped airduct of involute scroll casing shape directly links to each other with blower fan, secondary air channel and tertiary air passage through combustion air channel connection burner hearth rear end, described secondary air channel is positioned at the inboard of inboard wall of burner hearth, be provided with swirl vane in the secondary air channel, the tertiary air passage is arranged on the outer wall side of burner hearth.

Adopt the beneficial effect of technique scheme to be: this large-scale efficient coal burner is to optimize on the structure in burner and air channel, be that the wind powder mixture passage is that two is big, middle little structure, wind powder mixture is concentrated in the process of transmission, the wind powder mixture flow velocity is accelerated, during through burner mechanism end, at a wind swirl vane with under surely combustion dish 10 acts on, flow velocity slows down, and to furnace wall diffusion generation backflow, be subjected to around the furnace chamber 11 simultaneously and the thermal-flame radiation, wind powder mixture is heated to initial burning after the ignition temperature rapidly, burning, and emit a large amount of heats.And effectively prevented because the tempering phenomenon that produces because of pressure in the furnace chamber combustion process.The distance that secondary air duct is provided with is longer; and the water conservancy diversion of process swirl vane; in inboard wall of burner hearth, form the secondary wind of rotation; secondary wind not only can mix uniformly with the wind powder mixture that diffusion refluxes; make the more even of mixing; be more conducive to burning; can also separate contacting of pulverized coal flame and coal burner inwall; help the burner hearth that blows off of the ash content in the flame is reduced the burner inner wall slagging scorification, make this coal burner when burning, realize the function of instant deslagging; under the effect of combustion air and the stable rotation of shaft; burner hearth does not have accumulated slag substantially, and improved the service life of burner hearth greatly, has reduced the frequent shutdown maintenance of equipment in the past.Because this mode of secondary elegance around the wall eddy flow increased the protective effect to inboard wall of burner hearth, prolonged coal dust and stopped burning time in burner hearth simultaneously, coal dust is at burner hearth internal combustion efficient height.This structure has also changed coal burner overall structure phenomenon bigger than normal in the past.The tertiary air passage is arranged on the outer wall side of burner hearth, be provided with guide vane in the passage, not only play heat insulation and effect cooled furnace wall, and can further burn in the subsequent combustion zone of coal burner outside with the coal dust that does not have after-flame, because tertiary air does not rotate, so flame is more stable when further burn in the subsequent combustion zone, is more conducive to burning.By the mode of this fractional combustion, coal dust is burnt completely, and the utilization rate of coal dust has also obtained further raising, and has reduced the pollution problem that coal dust firing brings, and realizes the clean combustion of coal.Under declared working condition, the coal-fired ability of this large-scale efficient coal burner reaches 5～6t/h, and flame presents strong strip brilliant white, outlet flame is poly-and not diffusing under the tertiary air effect, have the efficiency of combustion height, heat up rapidly, flameholding and under high combustion intensity the characteristics of long service life, can be widely used in the above large-scale asphalt mixing plant of LB3000 type.

Description of drawings:

Below in conjunction with accompanying drawing to further detailed explanation of concrete enforcement of the present utility model.

Fig. 1 is the structural representation of burner mechanism of the present utility model and air channel mechanism.

The specific embodiment:

Large-scale coal burner shown in 1 as shown, has burner hearth 12, automatic ignition device 7, burner mechanism, air channel and burner hearth rotating mechanism, it is in-house that described automatic ignition device 7 is positioned at burner, and stretch in the furnace chamber 11 of burner hearth 12 inside, use the Wear-resistant, high-temperature resistant rubber seal between burner mechanism and the burner hearth 12, burner hearth 12 places on the burner hearth rotating mechanism, described burner mechanism is by powder inlet pipe 6, wind powder mixture passage 5, one time wind swirl vane 9 constitutes with steady combustion dish 10, described wind powder mixture passage 5 is that two is big, middle little structure, wind powder mixture enters burner mechanism by powder inlet pipe 6, in wind powder mixture passage 5, Pulverized Coal Concentration, the wind powder mixture flow velocity is accelerated, during through burner mechanism end, at a wind swirl vane 9 with under surely combustion dish 10 acts on, flow velocity slows down, and diffusion produces backflow to the furnace wall, is subjected to around the furnace chamber 11 simultaneously and the thermal-flame radiation, wind powder mixture is heated to initial burning after the ignition temperature rapidly, burning, and emit a large amount of heats.The size of each die cavity comes to determine in proportion in the burner mechanism, guarantees the required air of coal dust completing combustion, and concentrated coal dust is burnt in the atmosphere of reduction, reduces the generation of nitrogen oxide, reduces the pollution of coal dust firing to air.Described air channel is that the special-shaped airduct of involute scroll casing shape directly links to each other with blower fan, the secondary air channel 2 and the tertiary air passage 1 that are communicated with the burner hearth rear end through combustion air passage 4, described secondary air channel 2 is positioned at the inboard of inboard wall of burner hearth, be provided with swirl vane 8 in the secondary air channel, tertiary air passage 1 is arranged on the outer wall side of burner hearth.Secondary wind is by 8 effects of secondary wind swirl vane, not only can mix uniformly with the wind powder mixture that diffusion refluxes, the separation pulverized coal flame contacts with the coal burner inwall, help the burner hearth that blows off of the ash content in the flame, reduce the burner inner wall slagging scorification, burner hearth 12 rotates under the effect of burner hearth rotating mechanism simultaneously, does not have accumulated slag in the burner hearth substantially.Improved the service life of burner hearth greatly, reduced the frequent shutdown maintenance of equipment in the past.The coal-fired ability of this coal burner integral body is strong, can reach 5～6t/h under the declared working condition, and shaft is under high combustion intensity like this, because distributing, heat is optimized, deslagging ability obtains the essence raising in the combustion process, guaranteed that from structure this coal burner remains good working order, continous-stable, efficient operation.In the whole process of burning, the user can regulate coal input quantity according to the arts demand of equipment, and adjustment process realizes remote auto control, not only convenient but also safety.

Claims (1)

1. one kind large-scale efficient coal burner, have burner hearth, automatic ignition device, burner mechanism, air channel and burner hearth rotating mechanism, it is in-house that automatic ignition device is positioned at burner, and stretch into burner hearth inside, the Wear-resistant, high-temperature resistant rubber seal of burner mechanism and shaft, burner hearth places on the burner hearth rotating mechanism, it is characterized in that: described burner mechanism is made of powder inlet pipe, wind powder mixture passage, wind swirl vane and steady combustion dish, and described wind powder mixture passage is the structure of being small at both ends and big in the middle; Described air channel is that the special-shaped airduct of involute scroll casing shape directly links to each other with blower fan, secondary air channel and tertiary air passage through combustion air channel connection burner hearth rear end, described secondary air channel is positioned at the inboard of inboard wall of burner hearth, be provided with swirl vane in the secondary air channel, the tertiary air passage is arranged on the outer wall side of burner hearth.