CN101659523A - Curved-chamber kiln - Google Patents

Abstract

The invention relates to a curved-chamber kiln, in particular to the curved-chamber kiln for calcining massive ore such as limestone, dolomite and the like. The curved-chamber kiln comprises two kilncylinders, each kiln cylinder comprises a feeding device, a fuel spraying gun, a kiln shell, a bricklaying layer and a discharging device from top to bottom, the two kiln cylinders are connected by asmoke channel, and the curved-chamber kiln is characterized in that the cross section of each bricklaying layer of each kiln cylinder is oblate; the upper insides of the smoke channel in the middle part of the kiln cylinders are respectively provided with an outward guiding wind slope, and the lower outsides of the smoke channel in the middle part of the kiln cylinders are respectively provided with an inward dragging wind slope; and the kiln cylinders between the guiding wind slopes and the dragging wind slopes become narrow in the left-right direction. The curved-chamber kiln has the advantages of small cavity width, good calcining quality and easy operation.

Description

A kind of bent thorax kiln

Technical field

The present invention relates to a kind of bent thorax kiln, particularly be used for the bent thorax shaft furnace of massive ores such as calcined limestone, rhombspar.

Background technology

At present, the existing bent thorax kiln of producing products such as lime, rhombspar has two kiln bodies, and two kiln bodies are calcining and preheating ore by turns alternately, has connecting passage to communicate with each other between two kiln bodies, regularly commutates once with the working order of conversion kiln body.In when operation, two kiln bodies ore of packing into from the top, fuel is sent into by the top of two kiln bodies respectively, by many spray guns that are embedded in the preheating zone fuel is evenly distributed on the section of whole kiln, and fuel is burnt uniformly.The fuel that bent thorax kiln uses also is fluid fuel, all can as combustion gas, fuel oil, coal dust etc.

Because two kiln thoraxes need rely on connecting passage circulation flue gas, need to change at the flow direction of passage place flue gas.Showing as flue gas turns.The bent thorax shaft furnace of traditional structure, kiln thorax spatial axis is parallel, and is not curved two.Near a side at passage place, because distance is near, material bed thin, resistance is less, in flue gas turning process, and very smooth admission passage.Away from a side of passage, owing to distance, material bed thickness, resistance is bigger.In flue gas turning process, be difficult to admission passage, cause circulation not smooth, wind is walked a side, forms partially to burn.

Bent thorax kiln is built the cross section by laying bricks or stones and is generally circle, rectangle, semicircle, annular.Be generally rotational symmetry or straight barrel structure, the cross-sectional shape basically identical of above-below direction.Its common feature is: kiln thorax spatial axis straight perpendicular to ground, do not have bending; Can not effectively guide flue gas evenly to turn.Bias current problem in the time of can't fundamentally solving the flue gas turning.And connecting passage is longer, and the easy sedimentation of the dust in the flue gas causes the collection ash, causes passage narrow, increases flue gas resistance, even blocking channel.

On the other hand, rectangle, semicircle, ring section cause the calcining section all to have obvious wedge angle: the sharp corner ventilation property is significantly better than other positions, and bigger with the ventilation property difference of core, local temperature is higher.During Flow of Goods and Materials, because the influence of Xie Liao Cone angle and kiln wall resistance; The ore lowering speed of sharp corner is starkly lower than the lowering speed at other positions.Aggravated localized hyperthermia.Dross, the frequent scaling loss of spray gun even scaffold accident in the kiln often appear.And the sharp corner stress concentration is more serious, and housing is stressed unreasonable; Need more steel plate could satisfy requirement of strength.

Summary of the invention

In order to overcome the shortcoming of prior art, the invention provides a kind of bent thorax kiln, its housing width is little, and burning quality is good, easily holds operation.

The present invention solves the technical scheme that its technical problem takes: it comprises two kiln tubes, each kiln tube all has feeding unit, Fuel lance, kiln shell from top to bottom, builds layer and drawing mechanism by laying bricks or stones, two kiln tubes connect by exhaust gases passes, it is characterized in that: layer cross section of building by laying bricks or stones of described each kiln tube is oblateness; The inboard, top of the exhaust gases passes at described kiln tube middle part has outside wind-guiding slope respectively, and the outside, below of the exhaust gases passes at kiln tube middle part has inside Tuo Fengpo respectively; Described wind-guiding is sloping and drag the kiln tube between the wind slope to narrow down at left and right directions.

The present invention has following advantage: 1, oblate cross section can effectively reduce circular on diametric(al) width, make core to the distance at edge less than circular and semicircle, improve the core ventilation property; 2, the wedge angle of calcining section is effectively eliminated in oblate cross section, avoids dross in the kiln, spray gun scaling loss situation to take place; 3, kiln thorax core is goed deep on outside wind-guiding slope, exhaust gases passes turning, makes the exhaust gases passes of its underpart directly go deep into the cross section core, significantly improves the core ventilation property; 4, the outside wind-guiding aspect kiln thorax core in exhaust gases passes turning is given prominence to, and particle is fully rolled, and calcines more even.Simultaneously, in the process that particle rolls, the size particles quadratic distribution make macrobead flow to a side of ventilation property difference, and the good permeability of the macrobead bed of material is in the small-particle bed of material, from having improved the ventilation property in the outside on the one hand again.Less grain flow reduces inboard local ventilation property to a ventilation property side preferably.Thereby reach the effect of balance air-flow degree of uniformity; 5, under the prerequisite that guarantees ventilation property, increase substantially sectional area, output is largely increased.Bring up to more than 1000 tons from producing 800 tons daily.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is a schematic front view of the present invention;

Fig. 2 illustrates left view for the present invention;

Fig. 3 is the A-A sectional view among Fig. 1 of the present invention;

Fig. 4 is the B-B sectional view among Fig. 1 of the present invention;

Fig. 5 is the C-C sectional view among Fig. 1 of the present invention;

Fig. 6 is the D-D sectional view among Fig. 1 of the present invention.

Embodiment

As shown in drawings, the present invention includes two kiln tubes 1,2, each kiln tube 1,2 all has feeding unit 3, Fuel lance 4, kiln shell 5 from top to bottom, build layer 6 by laying bricks or stones and 7, two kiln tubes of drawing mechanism 1,2 connect by exhaust gases passes 8.Layer 6 cross section of building by laying bricks or stones of described each kiln tube 1,2 are oblateness.The inboard, top of the exhaust gases passes 8 at described kiln tube 1,2 middle parts has outside wind-guiding slope 9 respectively, and the outside, the below of the exhaust gases passes 8 at kiln tube 1,2 middle parts has the inside wind slope 10 of dragging respectively, also can only establish wind-guiding slope 9, does not establish and drags wind slope 10.Described wind-guiding slope 9 and drag the kiln tube 1,2 between the wind slope 10 to narrow down at left and right directions.Hot blast deflection in the kiln tube 1,2 is quickened, mixed, smoothly by exhaust gases passes 8.

Described exhaust gases passes 8 is formed by 3-5.

The kiln thorax of described two kiln tubes 1,2 is a Long Circle at the cross section of drawing mechanism 7 parts.

Kiln shell 5 cross sections of described each kiln tube 1,2 are oblate.

Two kiln thorax axis 11 shown in Figure 1 are symmetric curved shape.

Claims (6)

1, a kind of bent thorax kiln, it comprises two kiln tubes (1,2), each kiln tube (1,2) all has feeding unit (3), Fuel lance (4), kiln shell (5) from top to bottom, builds layer (6) and drawing mechanism (7) by laying bricks or stones, two kiln tubes (1,2) connect by exhaust gases passes (8), it is characterized in that: layer (6) cross section of building by laying bricks or stones of described each kiln tube (1,2) is oblateness; The inboard, top of the exhaust gases passes (8) at described kiln tube (1,2) middle part has outside wind-guiding slope (9) respectively, and the outside, below of the exhaust gases passes (8) at kiln tube (1,2) middle part has inside Tuo Fengpo (10) respectively; Described wind-guiding slope (9) and drag the kiln tube (1,2) between the wind slope (10) to narrow down at left and right directions.

2, bent thorax kiln according to claim 1 is characterized in that: described exhaust gases passes (8) is formed by 3-5.

3, bent thorax kiln according to claim 1 is characterized in that: the kiln thorax of described two kiln tubes (1,2) is a Long Circle at the cross section of drawing mechanism (7) part.

4, bent thorax kiln according to claim 1 is characterized in that: kiln shell (5) cross section of described each kiln tube (1,2) is for oblate.

5, bent thorax kiln according to claim 1 is characterized in that: the inboard, top of the exhaust gases passes (8) at described kiln tube (1,2) middle part has only outside wind-guiding slope (9) respectively.

6, bent thorax kiln according to claim 1 is characterized in that: described two kiln thorax axis (11) are symmetric curved shape.

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