CN2804622Y

CN2804622Y - Double-tunnel primary air coal powder main burner

Info

Publication number: CN2804622Y
Application number: CN 200420054092
Authority: CN
Inventors: 张恩仲
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-08-09
Anticipated expiration: 2014-12-29

Abstract

The utility model relates to a straight flow coal powder burner which is composed of two primary air channels, a side air channel and a waist air channel, particularly a straight flow coal powder burner arranged in the tangential circle way of four corners for a hearth of a coal power boiler. The double-channel primary air coal powder main burner comprises an upper and a lower primary air channels which are in equidirectional arrangement at a distance, and one igniting oil gun. The utility model is characterized in that the lengths of the upper and the lower primary air channels are different, and the upper and the lower primary air channels are in staircase arrangement. Waist air ports are arranged on both sides of the igniting oil gun positioned between the upper and the lower primary air channels; the side air channel is added on the unexposed surface of the outer side of a burner nozzle. The burner has the advantages of stable operation, strong applicability, difficult generation of a coking phenomenon and safe operation of the boiler.

Description

A wind coal dust of binary channels main burner

Technical field the utility model relates to a kind of single flow coal burner of being made up of two wind passages, side wind and waist wind, especially is installed on the single flow coal burner that the Pulverized Coal fired Boiler Furnace quadrangle tangential circle is arranged.

Technical background China is the developing country based on the coal-burning boiler generating set, for a long time, and but off-design operating mode often during by the coal-burning boiler operation of single coal design.Coal is complicated and changeable, seriously jeopardizes the boiler safety operation.Therefore it is imperative to develop the efficient coal burner of a new generation that coal adaptability is wide, adjusting function good and underload can surely fire.Patent of invention " methods of double-primary-air duct coal dust main burner and design and four jiaos of tangential-firing burners of transformation " (ZL91105899) discloses a kind of binary channels formula coal burner of being made up of two wind passages and high velocity air, this burner can solve above-mentioned problems, but also there is the combustion chamber coking problem, influences safe operation of the boiler.

Summary of the invention for the technical scheme that solves coking problem the utility model of existing in the said burner and take is:

A wind coal dust of a kind of binary channels main burner, it comprise up and down two arrange in the same way, a wind passage and a torch oil gun separated by a distance, it is characterized in that: last wind passage 1 and wind passage 2 next time are uneven in length and are ladder and arrange, the both sides of twice middle torch oil guns of wind passage are furnished with waist air port 5 about being positioned at, and the outside of burner nozzle is carried on the back fiery face and added side wind 3.Owing in burner, be formed with the hot flue gas of high temperature reflux between the wind passage of H distance up and down, help next time wind nozzle staged and catch fire, guarantee that burner surely fires; The both sides of burner inner wall have waist wind to wash away, and have pulverized coal flow to wash away the complete like this accident generation that can avoid coking and burn out spout up and down.Because the burner back-fire side is equipped with side wind, it can prevent that breeze airflow card water-cooling wall from causing coking, because of forming the raising that oxidizing atmosphere helps ash fusion point near it, played dual anti-scorch effect again.By regulating the size of waist wind, we can control the displacement of burner ignition point.

In order to adapt to the transformation of boiler unit, satisfy the variation of power plant coal quality, we can form a updip angle α with burner outlet end spout 4 and a wind passage in technique scheme, can realize moving in the heart in the furnace flame, realize safe and stable operation.General α was 5 °～15 ° when engineering was used.

In addition, we also can adorn row's central air hose 8 in the wind passage next time on burner in technique scheme, both can realize the burning demand of brown coal stove.

A wind coal dust of description of drawings Fig. 1 binary channels main burner structural representation

A wind coal dust of Fig. 2 binary channels main burner A-A cutaway view

A wind coal dust of Fig. 3 binary channels main burner spout structure schematic diagram

Fig. 4 embodiment 2 technical scheme structural representations

Fig. 5 embodiment 3 technical scheme structural representations

The specific embodiment is described with reference to the accompanying drawings as follows:

A wind coal dust of a kind of binary channels main burner is as Fig. 1, Fig. 2, shown in Figure 3.It comprises up and down two arrange in the same way, 1,2 and torch oil guns 6 of a wind passage of H separated by a distance, it is characterized in that: last wind passage 1 and wind passage 2 next time are uneven in length and are ladder and arrange that both length differences are L; Being positioned at up and down, the both sides of twice middle torch oil guns 6 of wind passage are furnished with waist air port 5, the outside of burner nozzle 4 is carried on the back fiery face and is added side wind 3, waist wind 5 and side wind 3 all can carry out the air quantity adjustment as required, and waist wind can adopt hot blast, warm wind or cold wind according to the design needs.H was generally 2～3 times of a wind snout average height when engineering was used, and L is 400～600mm.Owing in burner, be formed with the hot flue gas of high temperature reflux between the wind passage of H distance up and down, help next time wind nozzle staged and catch fire, guarantee that burner surely fires; The both sides of burner inner wall have waist wind to wash away, and have pulverized coal flow to wash away the complete like this accident generation that can avoid coking and burn out spout up and down.Because the burner back-fire side is equipped with side wind, it can prevent that breeze airflow card water-cooling wall from causing coking, because of forming the raising that oxidizing atmosphere helps ash fusion point near it, played dual anti-scorch effect again.By regulating the size of waist wind, we can control the displacement of burner ignition point.Only show among Fig. 3 bluff body 7 is housed in the last wind, we can also install bluff body additional in the exit of wind snout next time according to requirement of engineering, improve steady combustion effect.

Another embodiment (referring to Fig. 4) of this programme is: the bluff body 7 in the wind passage once on we can cancel in technique scheme, on burner, adorn row's central air hose 8 in the wind passage then next time, and both can realize the burning of brown coal stove.

In addition, what Fig. 5 provided is that power plant transforms the scheme of using, that is: in order to adapt to the transformation of boiler unit, satisfy the variation of power plant coal quality, we only need burner outlet end spout 4 and a wind passage are formed a updip angle α in technique scheme, can realize moving in the heart in the furnace flame, realize safe and stable operation.

Claims

1. a wind coal dust of binary channels main burner, it comprise up and down two arrange in the same way, a wind passage and a torch oil gun separated by a distance, it is characterized in that: last wind passage (1) and wind passage (2) next time are uneven in length and are ladder and arrange, the both sides of twice middle torch oil guns of wind passage are furnished with waist air port (5) about being positioned at, and the outside of burner nozzle is carried on the back fiery face and added side wind (3).

2. a wind coal dust of binary channels according to claim 1 main burner is characterized in that: in the wind passage central air hose (8) is housed next time.

3. a wind coal dust of binary channels according to claim 1 main burner is characterized in that: burner outlet end spout (4) has a updip angle α with a wind passage.