CN201050937Y

CN201050937Y - Ceramic tunnel kiln preheating belt modified structure

Info

Publication number: CN201050937Y
Application number: CNU2007201534459U
Authority: CN
Inventors: 江国良; 李猛; 洪亮; 余耀民; 吴永开; 刘添泉; 杨敏莉; 熊雪贞; 王小兰; 张淑芳; 吴俊�
Original assignee: HAITAI FURNACE DEVELOPMENT CENTER OF JIANGXI CERAMIC INSTITUTE
Current assignee: HAITAI FURNACE DEVELOPMENT CENTER OF JIANGXI CERAMIC INSTITUTE
Priority date: 2007-06-06
Filing date: 2007-06-06
Publication date: 2008-04-23
Anticipated expiration: 2017-06-06

Abstract

The utility model relates to an improved structure of a ceramic tunnel kiln preheating belt, which has the design keys that a group of stirring air curtains are arranged on kiln crowns whose interval is 2 meters in a first temperature zone 80-350 DEG C of the tunnel kiln preheating belt, simultaneously, and four sets of hot blast injection pipes 9 are crossly arranged on the upper and the lower of the segment of the kiln. Three sets of high speed regulating temperature nozzles 6 are crossly arranged on the lower portion of a kiln wall whose interval is 2 meter in a second temperature zone of 350-650 DEG C of the tunnel kiln preheating belt, and the hot blast injection pipes 9 whose number is corresponding are correspondingly arranged on a same section which is face to the upper portion of the square kiln. The improved structure is capable of leading the temperature difference of the upper and the lower of the tunnel kiln preheating belt to reduce to 30-50 DEG C, because the upper and lower temperature difference in the kiln is reduced, productions in the kiln are equably heated. The utility model is particularly suitable to be sintered from honeycomb ceramics and ceramic products which have high requirements for the prophase temperature uniformity of the preheating belt.

Description

The improvement structure of ceramic roller kiln preheating zone

Technical field

The utility model belongs to the ceramic kiln technical field, is specifically related to the improvement structure of a kind of ceramic roller kiln preheating zone, is mainly used in ceramic honey comb and other preheating zone ceramic product that temperature homogeneity is had relatively high expectations early stage is burnt till.

Background technology

Tunnel cave is the horizontal flame formula kiln that a kind of air-flow is bottom horizontal flow sheet.Though advantage is a lot, the problem that its preheating zone ubiquity is that the cross section upper and lower temperature difference is big, and the inhomogeneities of section temperature causes goods stress bigger thus, causes the goods cracking easily, and has prolonged firing time, has reduced furnace output.Producing the interior big main cause of upper and lower temperature difference of kiln is stratification of hot gas, because of this band is in negative-pressure operation, from the imprecision of kiln, as the bent envelope of kiln inlet, kiln car wadding and kiln wall, a large amount of cold wind that bleed such as the joint between the kiln car, cold wind density is big, sinks to the kiln bottom.Because kiln has certain altitude, under the effect of how much pressure heads, force the little hot flue gas of most of density upwards to flow, cause the air-flow layering, improved upper temp, reduced temperature of lower.Add the heat of kiln car absorption bottom flue gas, temperature of lower is reduced, aggravated the upper and lower temperature difference of preheating zone more.

Domestic common way at this band is at kiln hood the sealing air curtain to be set at present, with high-pressure blast one barrier of aperture high speed ejection formation from kiln hood air curtain airduct, stop extraneous cold wind to bleed in the kiln, simultaneously on Yao Qiang top, preheating zone many cold wind injection apparatus are set, high velocity air forces flue gas to flow downward.Above-mentioned way has been dwindled the temperature difference in the kiln to a certain extent, but, the cold wind that only depends on top to spray into dwindles upper and lower temperature difference because reducing kiln internal upper part temperature, and can not organize effective hot-air flow circulation, especially do not establish high velocity temperature adjusting burner in the Yao Qiang bottom, make temperature of lower low, the temperature difference in the kiln is more than 150-200 ℃, do not satisfy ceramic honey comb and other ceramic product that temperature homogeneity is had relatively high expectations burns till.

Summary of the invention

The utility model purpose is big at the existing ceramic roller kiln preheating zone temperature difference, and the technical measures that overcome the temperature difference are not enough, and propose a kind ofly can effectively reduce the improvement structure that efficient is burnt till in the tunnel cave preheating zone temperature difference and raising.

The technical scheme that the utility model adopted is: in the first humidity province 80-350 ℃ scope of tunnel cave preheating zone, arranged that every 2 meters kiln top is stirred an air curtain, the waste heat wind and the reverse high speed of flue gas that come from salband spray in the kiln, simultaneously in the kiln of this section up and down interlaced arrangement 4 cover spray hot wind pipes; In the second humidity province 350-650 ℃ scope of tunnel cave preheating zone, every 2 meters Yao Qiang bottom interlaced arrangement 3 cover high speed temperature adjustment nozzles, the spray hot wind pipe on same cross section over against the corresponding layout respective amount in square kiln top.

In first humidity province, owing to stir the air curtain stirring or stop flue gas in the kiln, force it to flow downward, to overcome stratification of hot gas, the waste heat wind that comes from salband sprays at a high speed in the kiln through the spray hot wind pipe, causes the air-flow even heating product of agitation cycle tempestuously; In second humidity province, the auxiliary air amount of high speed temperature adjustment nozzle by mixing, can in 80-1800 ℃ temperature range, regulate arbitrarily, reach the temperature requirement of desired area, the high speed hot blast of the high speed flue gas of ejection and playpipe ejection, on the kiln lateral cross section, produce the strong agitation circulation, make in the kiln about, internal and external temperature is very even.This improvement structure can make the upper and lower temperature difference of tunnel cave preheating zone narrow down to 30-50 ℃ owing to reduced upper and lower temperature difference in the kiln, make that product is heated evenly in the kiln, and accelerated go-cart speed, thereby improved product burn till quality and output.

Description of drawings

Fig. 1 is the kiln body vertical structure schematic diagram of the utility model first humidity province;

Fig. 2 is the kiln body vertical structure schematic diagram of the utility model second humidity province;

Fig. 3 is the kiln body section structural representation of the utility model first humidity province;

Fig. 4 is the kiln body section structural representation of the utility model second humidity province;

The specific embodiment

Concrete structure of the present utility model and content are described in detail as follows in conjunction with the accompanying drawings:

The utility model comprises firing chamber 1, kiln wall 2, kiln top 3, kiln car 4, playpipe 5, high speed temperature adjustment nozzle 6, exhaust smoke hole 7, waste heat airduct 8 etc., and its concrete embodiment is:

1, sends into first temperature province (80-350 ℃) by salband waste heat wind, spray hot wind is all adopted in this zone, and mix a certain amount of cold wind according to kiln temperature, spray in the kiln with the reverse high speed of flue gas by the playpipe 5 that is arranged on kiln top 3, form and stir air curtain, spray in the firing chamber 1 at a high speed in horizontal direction by Yao Qiang top and the bottom interlaced arrangement playpipe 9 simultaneously, to form the air-flow forced circulation.

2, send into second temperature province (350-650 ℃) by salband waste heat wind, take spray hot wind and the combining form of high combustion rate burner temperature adjustment wind facies in this zone, spray in the kiln by kiln top playpipe 5 and the reverse high speed of flue gas, be injected in horizontal direction in the firing chamber 1 by kiln wall 2 top playpipes 9, be provided with high velocity temperature adjusting burner 6 at kiln wall playpipe over against square bottom, the auxiliary air amount of high velocity temperature adjusting burner by mixing can be regulated temperature of lower arbitrarily, and causes air-flow acutely to circulate to dwindle the temperature difference in the kiln.On the kiln wall of first warm area and second warm area, be provided with exhaust smoke hole 7, air-flow is played regulating action.

Claims

1. the improvement structure of a ceramic roller kiln preheating zone, it is characterized in that in the first humidity province 80-350 ℃ scope of tunnel cave preheating zone, arranged that every 2 meters kiln top is stirred an air curtain, the waste heat wind and the reverse high speed of flue gas that come from salband spray in the kiln, simultaneously in the kiln of this section up and down interlaced arrangement 4 cover spray hot wind pipes (9); In the second humidity province 350-650 ℃ scope of tunnel cave preheating zone, every 2 meters Yao Qiang bottom interlaced arrangement 3 the cover high speed temperature adjustment nozzles (6), the spray hot wind pipe (9) on same cross section over against the corresponding layout respective amount in square kiln top.

2. the improvement structure of ceramic roller kiln according to claim 1 preheating zone is characterized in that being provided with exhaust smoke hole (7) on the kiln wall of first warm area and second warm area.