Telescopic pair of thorax shaft furnace
The present invention relates to lumpy material roasting kiln field, particularly a kind of telescopic pair of thorax shaft furnace.
General shaft furnace is along with the increase of output, its geometrical dimension should increase according to a certain percentage, with regard to two thorax shaft furnaces, because the high-temperature gas of roasting band is directly by periphery exhaust or air inlet, this makes high-temperature gas in the mobile process that flows downward or make progress, away from roasting band lower central position, cause the not enough underburnt that produces of this position heat supply, the larger phenomenon of equivalent diameter of kiln is more obvious, in order to compensate this defect, can only increase roasting band height, therefore the kiln height of existing shaft furnace is relevant with kiln thorax cross section diameter size, shaft furnace specification generally need keep aspect ratio constant.
Like this; the problem of bringing is that the calorie distribution of kiln body too high drag losses great, center and periphery is uneven, the long quality product that affects of material roasting time; along with the cantilevered spray gun of increase and the installation difficulty of spray gun protective guard of kiln thorax diameter are also very large, hindered shaft furnace to large scale development.
Summary of the invention
The object of this invention is to provide a kind of telescopic pair of thorax shaft furnace, overcome the deficiencies in the prior art, optimize the distributed architecture of material in kiln thorax, improve the calorie distribution uneven phenomenon in roasting process, the height of shaft furnace is not changed with the specifications vary of kiln, make shaft furnace become possibility to large scale development.
For achieving the above object, the present invention is achieved through the following technical solutions:
Telescopic pair of thorax shaft furnace, comprise symmetrical two kiln thoraxes and Fuel lance, in kiln thorax, be respectively from the bottom to top preheating zone, roasting band and cooling zone, two kiln thoraxes are connected by connecting passage with the junction of cooling zone at calcining zone, Fuel lance outlet is arranged in the cross section of kiln thorax, described Liang Geyaotang center is respectively equipped with inner sleeve, inner sleeve lower end is fixed on the drawing mechanism of kiln thorax bottom, the axial location card of inner sleeve upper end and kiln thorax top is hinged, and the termination of axial location card and kiln thorax housing are hinged; The top of kiln thorax is provided with annular distributor, above the inner sleeve below annular distributor, is provided with tripper;
Described inner sleeve is steel structure body from bottom to top; the protective sleeve that has refractory materials is built in outside at inner sleeve; the inside of inner sleeve is air passageways; inner sleeve and kiln thorax inwall form annular section; the specification size of shaft furnace is only relevant with annular section region area size, and the height of kiln body preheating zone and roasting band etc. does not change with the specifications vary of kiln substantially.
In described drawing mechanism, be provided with many discharging machines, drawing mechanism below is provided with discharge bucket.
What in the air passageways of described inner sleeve inside, pass into is combustion air or cooling air.
Described Fuel lance is according to the annular section shape of kiln thorax, and by two rings or the above evenly distributed layout of two rings, the protective guard of Fuel lance is fixed on kiln shell and/or inner sleeve from inside to outside.
Between brick body on the protective sleeve of described inner sleeve, adopt convex-concave structure to be mutually interlocked.
In described connecting passage, space mounting has interchanger.
Compared with prior art, the invention has the beneficial effects as follows: optimize the distributed architecture of material in kiln thorax, kiln body drag losses is little, the calorie distribution of Yao Tang center and periphery is even, improve the calorie distribution uneven phenomenon in roasting process, good product quality, be conducive to saves energy, the height of shaft furnace is not changed with the specifications vary of kiln, convenient Fuel lance and the protective guard installed, solved lime, the two thorax shaft furnace maximization problems of rhombspar, be applicable to newly-built, reconstruction, enlarging, specification is greater than more than 600 tons for producing daily, or even in technological design more than daily output kiloton.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention section structure schematic diagram;
Fig. 2 is embodiment of the present invention two dimensional structure schematic diagram;
Fig. 3 is inner sleeve protective sleeve embodiment brick body interlocking pattern section structure schematic diagram of the present invention;
Fig. 4 is inner sleeve protective sleeve embodiment brick body interlocking pattern two dimensional structure schematic diagram of the present invention.
In figure: 1-kiln thorax 2-Fuel lance 3-connecting passage 4-inner sleeve 5-drawing mechanism 6-axial location card 7-annular distributor 8-tripper 9-protective sleeve 10-discharge bucket 11-shaft furnace FRAME FOUNDATION 12-brick body 13-anchoring piece 14-insulating lining
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
See Fig. 1, Fig. 2, telescopic pair of thorax shaft furnace example structure schematic diagram of the present invention, comprise symmetrical two kiln thoraxes 1 and Fuel lance 2, in kiln thorax 1, be respectively from the bottom to top preheating zone, roasting band and cooling zone, two kiln thoraxes 1 are connected by connecting passage 3 with the junction of cooling zone at calcining zone, Fuel lance 2 outlets are arranged in the cross section of kiln thorax 1, two kiln thorax 1 centers are respectively equipped with inner sleeve 4, inner sleeve 4 lower ends are fixed on the drawing mechanism 5 of kiln thorax bottom, the axial location card 6 of inner sleeve 4 upper ends and kiln thorax top is hinged, the termination of axial location card 6 and kiln thorax 1 housing are hinged, the top of kiln thorax 1 is provided with annular distributor 7, above the inner sleeve 4 below annular distributor 7, is provided with tripper 8,
Inner sleeve 4 is steel structure body from bottom to top, in the outside of inner sleeve 4, builds the protective sleeve 9 that has refractory materials, and the inside of inner sleeve 4 is air passagewayss, and inner sleeve 4 forms annular section with kiln thorax 1 inwall, and material completes preheating, roasting, cooling in annular section region; Combustion air and waste gas is commutation separately respectively.
The virtual height substantially constant of shaft furnace, specification size is only with annular region area change, the specification size that is shaft furnace is only relevant with annular region size, the height of kiln body preheating zone and roasting band etc. does not substantially change this feature with the specifications vary of kiln and only has the shaft furnace with inner sleeve just to have, so fluid resistance is little.In drawing mechanism 5, be provided with many desk fans shape discharging machine, drawing mechanism 5 belows are provided with discharge bucket 10, and drawing mechanism is by integral hoisting in shaft furnace FRAME FOUNDATION 11, and this device in material, also carries the load of inner sleeve 4 and protective sleeve 9 in carrying kiln.In the air passageways of inner sleeve 4 inside, can need to pass into combustion air or cooling air according to technique.
Fuel lance 2 is according to the annular section shape of kiln thorax; from inside to outside by two rings or the above evenly distributed layout of two rings; the problems such as the protective guard of Fuel lance 2 is fixed on kiln shell and/or inner sleeve, has solved large-scale shaft furnace spray gun protective guard single-cantilever oversize, insecure.
The protective sleeve of seeing Fig. 3, Fig. 4 inner sleeve is comprised of brick body 12, anchoring piece 13 and insulating lining 14; between brick body 12 on protective sleeve, adopt convex-concave structure to be mutually interlocked; by anchoring piece 13, brick body 12 and insulating lining 14 are connected together; and with inner sleeve 4 outer walls be welded into as a whole, to guarantee the normal operation of protective sleeve 9 and to increase the service life.
Enough spacious in connecting passage 3 spaces, can mounting heat exchanger, waste gas is declined or rise evenly, hot flue gas is difficult for bias current, and connecting passage top all adopts cast structure, easy construction and good airproof performance, solved large-scale shaft furnace exhaust steam passage wide, the problem that difficulty is large is built at top by laying bricks or stones.
During production, two kiln thoraxes that are provided with inner sleeve, reach alternately heating by reversing system, exchange at regular intervals the function of a kiln thorax, and a kiln thorax every one-period heating once.During production, need Wingdale or rhombspar (hereinafter to be referred as raw material) the material piece of the load weighted release mesh of calcining through the tripper at this kiln thorax top, to send in annular region again from the distributor at a kiln thorax top, in calcination process, during heat supply, fuel is sent into by another kiln thorax top, by being embedded in the Fuel lance in raw material, fuel is evenly distributed on the ring kiln thorax section of bottom, preheating zone, combustion air is sent into kiln inner top with Root's blower from the inner sleeve bottom of this kiln thorax, the combustion air that passes into two kiln thoraxes adopts commutation valve plate to control, according to the needs of each commutation cycle, to calcining thorax, pass into combustion air or cooling air, preheating thorax is with cooling its inner sleeve of inner sleeve cooling blower arranging separately, to extend the work-ing life of inner sleeve.Through preheating zone and raw material heat exchange, obtain after high temperature, enter calcining zone and fuel mix afterfire heat release and make raw material obtain fast decoupled, now, the high-temperature flue gas and the raw material that in calcining kiln thorax, produce all flow downward along annular section, this and stream heating, can make the hottest flame contact with raw material and complete calcining.And stream heating can reach very high rate of heat exchange when calcining zone is started and not make finished product burning.Air-flow (waste gas) through calcining zone converges with the cooling air from cooling zone, after communicating passage spacious between two kiln thoraxes with the calcining zone, the preheating zone that enter this kiln thorax together with the cooling air of another kiln thorax (preheating thorax), with the material counter-current flow in this kiln thorax, in preheating zone and raw material, carry out a large amount of heat exchanges, waste gas is discharged equably from the top of this kiln thorax after being cooled to lower temperature, after dedusting, by induced-draft fan, enters atmosphere.The finished product of having calcined enters cooling zone and carries out cooling.Cooling air feeds from the bottom of two kiln thoraxes simultaneously, carries out counterflow heat exchange with the material in cooling zone annular section region, and the drawing mechanism of cooling good finished product at the bottom of by kiln draws off.
The present invention is applicable to the differential larger Wingdale of granularity or rhombspar raw material, also can use solid fuel, the geseous fuel of liquid fuel and various calorific values.When using geseous fuel, need to configure the safe operating device of geseous fuel necessity, there is very wide application prospect.