CN101153770A

CN101153770A - Under-layer air distributing rotary kiln

Info

Publication number: CN101153770A
Application number: CNA2006101246822A
Authority: CN
Inventors: 熊承庆
Original assignee: Building Material Energy Saving Apparatus General Plant Huangshi
Current assignee: Building Material Energy Saving Apparatus General Plant Huangshi
Priority date: 2006-09-29
Filing date: 2006-09-29
Publication date: 2008-04-02
Anticipated expiration: 2026-09-29
Also published as: CN101153770B

Abstract

The invention relates to an under-layer wind-fitting rotating stove of industrial calcination materials, which comprises a horizontal rotating stove tube, bearing supports positioned at two ends of a bearing stove tube and an air supply device is assembled, particularly, a plurality of main air ducts are arranged in a refractory lining in the kiln tube along the circumference, each main air duct is arranged in the tube main axially, a plurality of radial arranged branch air ducts are welded on each main air duct, an outlet of the branch air duct leads to the outside of the refractory lining; the outer wall of the stove tube is provided with a circle of air inlets which are provided with relative amounts with the main air ducts, and the air inlets are communicated with the main air ducts; an air inlet cover of the air supply device is arranged at the left lower corner or the right lower corner of the stove tube, and opposite to the air inlets on the outer wall of the stove tube. The invention solves problems that materials in a general stove tube are only burnt on the surface, and the inner layer is difficult to be burnt, so a burning-out speed for the rotating stove is increased by 1-2 times, and combustible gas and tars in flue gas are greatly reduced, and a temperature of flue gas is greatly improved. The invention is particularly applicable for calcining waste zinc sulfide, copper sulfide, etc.

Description

Under-layer air distributing rotary kiln

(1) technical field: the present invention relates to a kind of kiln improvement technology of industrial calcining materials, is a kind of brand-new under-layer air distributing rotary kiln.

(2) background technology: in the prior art, common rotary kiln is mainly by the supporting base of rotary kiln tube, supporting kiln tube, and forms to wind apparatus, and it is arranged on the end nozzle of kiln tube to wind apparatus.Use this rotary kiln and calcine flammable material such as rubbish zinc sulphide, during copper sulfide etc., material angle of repose according to self under the gradient of kiln body and rotary action is piled up in the kiln body, gently upset and move to the kiln tail, to guarantee and the oxygen reaction that enters in the kiln, full and uniform ground after-flame (see figure 1), material is under the effect of self gravitation as can be seen from Fig. 1, the material of lower floor is pushed down, can't contact with air, only surperficial one deck material burning, caused many drawbacks like this: the material that has fired (1) constantly tumbles the bottom along combustion front from the angle of repose top, and speed will be put out firing layer slightly soon, forces igniting again; (2) material of the about 15-20% of only surperficial one deck burning, and the part of having fired constantly tumbles to be dinched under the aspect of being pressed onto and go out produces a large amount of imflammable gas contaminated environment that expels from kiln, otherwise need deal with in addition; (3) material that newly exposes of surface is firing once more, repeatedly repeatedly, goes round and begins again like this, slowly works difficultly.For this reason, must do the kiln body bulky, the kiln cercus be set up secondary furnace, once has high input, power consumption consuming time, operating cost height, inefficiency.

(3) summary of the invention: purpose of the present invention will overcome only superficial layer burning of material in the common rotary kiln tube exactly, and the internal layer material is difficult to burning, and speed is slow, and the problem that operating cost is high provides a kind of brand-new under-layer air distributing rotary kiln.

Concrete scheme of the present invention is: improve at existing common rotary kiln, it has horizontal rotary kiln tube, and the supporting base at supporting kiln tube two ends, and be furnished with to wind apparatus, it is characterized in that: in the kiln tube, along circumference some air mains are arranged in the refractory lining, it is axial arranged that each air main is in tube, the branch wind pipe of some radial arrangement that on every air main, are welded, and the outlet of branch wind pipe is led to outside the refractory lining; Have the air inlet of a circle and the corresponding quantity of air main at the outer wall of kiln tube, air inlet is communicated with air main; The described lower left corner or the lower right corner of being loaded on the kiln tube for its air intake cover of wind apparatus, promptly material is piled up the below in the kiln, and the air inlet on the kiln drum outer wall.

Some air mains of arranging in the refractory lining in the kiln tube described in the present invention are equidistant uniform on circumference.

The some branch wind pipes that are welded described in the present invention on air main are equidistant uniform.

Be to improve the air intake effect, the branch wind pipe on air main and the direction of rotation back-flexing of kiln tube are welded described in the present invention.

For making air intake cover cooperate reliable with air inlet on the kiln drum outer wall, the radial thrust that balance air intake and pressure-air cause, among the present invention, be furnished with two channled rails in the both sides of kiln drum outer wall air inlet especially, be contained between two channled rails for the air intake cover of wind apparatus, and design has one group of roller type hook on air intake cover, and its roller reversal of the natural order of things is rolled in the channled rail groove and connected.

Operation in the kiln tube is piled up feature and (is seen Fig. 4 according to material, be arc), the even wind of giving for guaranteeing that different-thickness is material bed satisfies the burning of the whole bed of material, be separated with 3 air intake districts among the present invention the air intake cover branch of wind apparatus, and the air distribution valve be housed at the front end of air intake cover.

The present invention has thoroughly changed the air intake mode of common rotary kiln, air intake has axially changed bottom into radially by the top layer of material, be particularly conducive to the burning of material, make the burnout velocity of rotary kiln improve 1-2 doubly, operating cost greatly reduces, and efficient improves greatly, imflammable gas and tar in the flue gas significantly reduce, flue-gas temperature significantly improves, and has created good condition, environmental protection and energy saving for follow-up UTILIZATION OF VESIDUAL HEAT IN.

(4) description of drawings:

Fig. 1 is the kiln tube schematic cross-section of common rotary kiln;

Fig. 2 is the kiln tube partial front elevation view of rotary kiln of the present invention;

Fig. 3 is the A place amplification assumption diagram of Fig. 2;

Fig. 4 is the B-B cutaway view of Fig. 2.

Among the figure: 1-kiln tube, 2-refractory lining, 3-material, 4-channled rail, 5-air inlet, 6-branch wind pipe, 7-air main, 8-air intake cover, 9-roller type hook, 10-roller, 11-blower fan, 12-air distribution valve, 13-air intake district I, 14-air intake district II, 15-air intake district III.

(5) specific embodiment:

The same prior art of the present invention, supporting base with horizontal rotary kiln tube and supporting kiln tube two ends, relative prior art, the present invention has taked following improvement: referring to Fig. 2,3,4, in the refractory lining 2 in kiln tube 1, along the circumference disposed at equal distance 15 air mains of axially placing 7 are arranged, the length of air main 7 can be isometric or partly long with socket; 30 of the disposed at equal distance that on every air main 7, is welded branch wind pipes 6 radially, (radical of air main 7 and branch wind pipe 6 what can the suitable adjustment of different do) according to the specification of rotary kiln; Branch wind pipe 6 and kiln tube direction of rotation back-flexing design, to improve air intake effect (also can be straight tube), the outlet of branch wind pipe 6 is led to outside the refractory lining.Outer wall (preferably being positioned at the middle part) at the kiln tube has 15 air inlets 5 of a circle, is communicated with 15 air mains 7 respectively.In the lower right corner of kiln tube 1 (when the kiln tube turns clockwise, then should place the lower left corner), and air intake cover 8 is installed over against air inlet 5, air intake cover was separated with three air intake districts (I, II, III) 13,14,15 in 8 minutes, the front end of air intake cover 8 is equipped with air distribution valve 12, external blower fan 11.For guaranteeing that air intake cover 8 cooperates reliable with air inlet 5 on the kiln drum outer wall, be furnished with two channled rails 4 in the both sides of kiln drum outer wall air inlet 5, air intake cover 8 is contained between two channled rails 4, and one group of four pairs of roller types hook 9 has been welded on air intake cover 8, divide all around to arrange, in the groove of its upper roller 10 reversals of the natural order of things in channled rail, rolling connects.When air intake cover 8 takes strong fix to install, also can save channled rail 4 and roller type hook 9.

Operation principle of the present invention is summarized as follows:

Pressure-air is distributed to three air intake districts 13,14,15 of air intake cover 8 by air distribution valve 12, wherein air intake district 14 relative intakes are bigger, again successively by air inlet 5, air main 7, branch wind pipe 6 enters the bottom of material 3, give the abundant oxygen supply of material, the air intake mode has been improved the fired state of material greatly under this layer, has improved the burnout velocity and the efficiency of combustion of material.

Claims

1. under-layer air distributing rotary kiln, it includes horizontal rotary kiln tube, and the supporting base at supporting kiln tube two ends, and be furnished with to wind apparatus, it is characterized in that: in the kiln tube, along circumference some air mains are arranged in the refractory lining, each air main at the tube inner main axis to layout, the branch wind pipe of some radial arrangement that on every air main, are welded, the outlet of branch wind pipe is led to outside the refractory lining; Have the air inlet of a circle and the corresponding quantity of air main at the outer wall of kiln tube, air inlet is communicated with air main; The described lower left corner or the lower right corner of being loaded on the kiln tube for its air intake cover of wind apparatus, promptly material is piled up the below in the kiln, and the air inlet on the kiln drum outer wall.

2. a kind of under-layer air distributing rotary kiln according to claim 1 is characterized in that: described some air mains of arranging in the refractory lining in the kiln tube are equidistant uniform on circumference.

3. a kind of under-layer air distributing rotary kiln according to claim 1 and 2 is characterized in that: the described some branch wind pipes that are welded on air main are equidistant uniform.

4. according to claim 1 or 3 described a kind of under-layer air distributing rotary kilns, it is characterized in that: described be welded the branch wind pipe on air main and the direction of rotation back-flexing of kiln tube.

5. a kind of under-layer air distributing rotary kiln according to claim 1, it is characterized in that: be furnished with two channled rails in the both sides of kiln drum outer wall air inlet, be contained between two channled rails for the air intake cover of wind apparatus, and design has one group of roller type hook on air intake cover, and its roller reversal of the natural order of things is rolled in the channled rail groove and connected.

6. a kind of according to claim 1 or 5 under-layer air distributing rotary kiln is characterized in that: be separated with 2 to 4 air intake districts for the air intake cover branch of wind apparatus, and at the front end of air intake cover the air distribution valve be housed.