CN203033894U - Parallel flow heat storage double chamber kiln support arch structure - Google Patents

Parallel flow heat storage double chamber kiln support arch structure Download PDF

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Publication number
CN203033894U
CN203033894U CN 201220745146 CN201220745146U CN203033894U CN 203033894 U CN203033894 U CN 203033894U CN 201220745146 CN201220745146 CN 201220745146 CN 201220745146 U CN201220745146 U CN 201220745146U CN 203033894 U CN203033894 U CN 203033894U
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kiln
zone
calcining
heat
brick
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邓承春
彭海儿
何福礼
张银斌
邹宇宏
张兴国
吴列文
陈永文
黄焕荣
陈伟权
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Shaogang Songshan Co Ltd Guangdong
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Shaogang Songshan Co Ltd Guangdong
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Abstract

The utility model relates to a parallel flow heat storage double chamber kiln support arch structure, wherein a furnace body is divided into a preheating zone, a calcining zone and a cooling zone, a work liner which is made from high alumina or jade refractory bricks is arranged in the work liner of the calcining zone, and a flat support arch which is made from alumina fibers or steel fiber reinforced high aluminum or jade castables in advance is arranged on the top of a support bracket which is arranged in the cooling zone. The work liner of the calcining zone ishgih alumina brick or jade brick, the support arch is of a flat top structure which is made from the alumina fibers or the steel fiber reinforced high aluminum or the jade castables in advance, and the parallel flow heat storage double chamber kiln support arch structure does not have the phenomena of cracking and brick falling during the use process, and prolongs disposable furnace life of a parallel flow heat storage double chamber kiln above 10 years from 6 years.

Description

A kind of and two thorax kiln supporting arch structures of stream accumulation of heat
Technical field
The utility model relates to the supporting structure of a kind of lime shaft kiln calcining zone and above refractory materials, relates in particular to a kind of bracket support type and flows the supporting arch structure of the two thorax lime shaft kiln calcining zones of accumulation of heat and above refractory materials.
Background technology
Nineteen sixty-five Switzerland Mai Erzi company has designed a kind of brand-new " and flowing heat accumulating type (PFR) limestone kiln ", and this kiln furnitures have very high thermo-efficiency, and can produce high-quality lime.Because it is own original up to having constantly to improve, obtain patent, this limestone kiln finally becomes world-renowned " wheat Wurz kiln ".Initial design be 150 tons of limestone kilns of daily output of oil firing, large-tonnage limestone kiln and be that the technology of fuel also develops rapidly with gas soon.In the seventies later stage, adopt the patented technology of powder solid fuel also to succeed.Nowadays Mai Erzi company can provide 100 tons of daily outputs to 800 tons of output and flow the two thorax kilns of accumulation of heat.The limestone kiln firing system can adopt fluid fuels such as liquid, gas and powder solid.More than 50 the country's designs or built more than 600 and flow the two thorax kilns of accumulation of heat in the whole world of Mai Erzi company.Introduce from the eighties in last century China Ministry of Metallurgical Industry from Switzerland wheat Wurz Ou Fenbao company first and flow the two thorax kilns of accumulation of heat after, the China's Mainland at present existing more than 60 in operation.
And the two thorax kilns of stream accumulation of heat are by two shaft furnaces of forming in the continuous kiln tubes of lower position.The calcining of two kiln thorax alternate turns and preheating Wingdale are provided with connecting passage and communicate with each other between the calcining zone bottom of two kiln thoraxes, commutated every 12 minutes approximately once with the working order of conversion kiln thorax.When operation, two kiln thoraxes Wingdale of alternately packing into, fuel is sent into by the top of two kiln thoraxes respectively, by passing more than 30 spray gun that the Wingdale bed of material is inserted into preheating zone bottom downwards fuel is evenly distributed on the transverse section of whole kiln thorax, temperature field uniformity on each transverse section of calcining zone is conducive to the even calcining of Wingdale very much.
And the two thorax kilns of stream accumulation of heat belong to positive pressure operation, and under the ordinary production situation, the kiln gun pressure power of calcining is higher than the kiln gun pressure power of non-calcining all the time, thereby has guaranteed the proper flow of gas in the kiln body.In the first calcining cycle, combustion air feeds from the top of kiln thorax one, and flows downward under the effect of pressure reduction.Combustion air flows downward on one side in the preheating zone, on one side by the Wingdale heat temperature raising of heat.When arriving calcining zone, mix with the coal gas that through even more than 30 lance ejection of arranging along kiln thorax transverse section herein.Because Wingdale has herein had very high temperature, just burning immediately when the mixture of air and coal gas touches the high temperature Wingdale.Air and gas-fired product flow downward with Wingdale, and this technological process just is called " and stream ", are and one of thermal technology's characteristics of the two thorax kilns of stream accumulation of heat.And stream can make combustion flame directly contact with Wingdale, and Wingdale begins to decompose under very high heat exchanger effectiveness.Arrive calcining zone when terminal, the combustion product gases temperature reduces relatively, can guarantee that Wingdale evenly finishes calcining under the light roasting temperature.The lime of calcining after finishing enters cooling zone, carries out heat exchange with the lime cooling air that feeds at the bottom of kiln, makes the lime temperature drop to 60~80 ℃, enters transition feed bin at the bottom of the kiln then, and oscillating feeder draws off at the bottom of kiln again.Lime cooling air and lime finish that temperature raises after the heat exchange, and rise to the connecting passage place and combustion product gases is mixed into kiln thorax two.
Flue gas arrives the preheating zone after flowing from bottom to top and passing calcining zone in kiln thorax two.The Wingdale of just having packed in the preheating zone is equivalent to a big heat exchanger.High-temperature flue gas and Wingdale directly carry out heat exchange, drop to about 160~180 ℃ for thermal energy transfer behind the Wingdale temperature and discharge from the kiln top.Heat was put aside in the temperature rising after Wingdale had absorbed flue gas heat energy, wait for the combustion air that next cycle comes preheating to feed from the kiln top, this Wingdale and high-temperature flue gas inverse motion, the technological process that makes Wingdale absorb flue gas heat energy just is called " accumulation of heat ", is and another thermal technology's characteristics of the two thorax kilns of stream accumulation of heat.
A calcining cycle of lasting 12 minutes begins commutation after finishing, and need 50~60 seconds turnaround time approximately.During commutating, combustion air and coal gas are transformed into another kiln thorax, quickened lime draws off at the bottom of kiln.After commutation was finished, combustion air and coal gas entered kiln thorax two, and combustion product gases is discharged from kiln thorax one top, and Wingdale is packed into from kiln thorax one top, in such second calcining cycle, formed the periodic job that also flows calcining and adverse current accumulation of heat between 2 burner hearths thus.
And the thermal characteristics of stream calcining and adverse current accumulation of heat has determined this kiln furnitures that very high thermo-efficiency is arranged, its heat energy consumption is minimum in all types limestone kilns such as rotary kiln, sleeve kiln, and it is 3.8GJ/ ton lime (be equivalent to 130kg and mark coal/ton lime) that the overall heat consumption of producing lime is lower than.
And the supporting way of the two thorax kiln calcining zones of stream accumulation of heat and above refractory materials has two kinds, and a kind of is traditional structure, i.e. bracket support type, and another kind is novel texture, i.e. the suspension cylinder formula.In the whole world more than 600 and flow in the two thorax kilns of accumulation of heat and have more than 60 to be the suspension cylinder formula, all the other are the bracket support type, and more than 60 of the China's Mainland and flow in the two thorax kilns of accumulation of heat and have more than 20 to be the suspension cylinder formula, all the other are the bracket support type.
Existing bracket support type also flows the subject matter that the two thorax kilns of accumulation of heat exist and has:
The one, and the two thorax kiln calcining zone working linings of stream accumulation of heat adopt basic refractory, mostly be high-puritied magnesia brick greatly, because magnesite refractory all must be taked effective moistureproof and waterproof measure in whole process such as making, store, transport, build by laying bricks or stones, preventing that the brick body from making moist efflorescence and its structure is destroyed, it produces general requirement to the time of coming into operation and is no more than 3 months; And because the thermal shock resistance of magnesia brick is relatively poor relatively, thermal expansivity is big, rate of expansion in the time of 1000 ℃ is approximately 1~1.2%, its expansion stress is equivalent to 6 times of magnesia brick self structure intensity, heat-up rate is grasped the bad brick body cracking that is easy to cause in baking kiln process, will seriously shorten its work-ing life.
The 2nd, more than ten supporting arch of the two thorax kilns of bracket support type is to build by laying bricks or stones with several difform special-shaped magnesia bricks to form, in use can improper because of baker, frequently stop reasons such as kiln and cause bigger thermograde, cause vault cracking, local shedding, with serious reduction of service life, especially supporting arch hundreds of tons of calcining zones and preheating zone refractory materials above 1050 ℃ of lower supports it is in case brick occurs falling with the life of the whole stove of entail dangers to.
The utility model content
In order to overcome the above-mentioned shortcoming of prior art, the utility model provide a kind of can effectively avoid supporting arch in use cracking and fall the brick accident, disposable furnace life can reach more than 10 years and flow the two thorax kiln supporting arch structures of accumulation of heat.
The technological method that its technical problem that solves the utility model adopts is: a kind of and two thorax kiln supporting arch structures of stream accumulation of heat, body of heater is divided into preheating zone, calcining zone and cooling zone, working lining in the calcining zone is equipped with the working lining of whole use high alumina matter or corundum fireproof brick, and the support bracket top in cooling zone is equipped with and is adopted sapphire whisker or steel fiber to strengthen high alumina matter or the prefabricated flat-top supporting arch that forms of corundum pouring material.
The beneficial effects of the utility model are: the calcining zone working lining is high alumina brick or corundum brick, supporting arch is that sapphire whisker or Stainless Steel Fibre strengthen high alumina matter or the prefabricated flat-tope structure that forms of corundum pouring material, there is not cracking in the use, falls the brick phenomenon, make and flow the two thorax kilns of accumulation of heat disposable furnace life to extend to more than 10 years by 6 years.
Description of drawings:
Fig. 1 is the axial longitudinal diagram of kiln thorax one and kiln thorax two.
Fig. 2 is the structural representation of the top of brick arc described in Fig. 1 supporting arch.
Fig. 3 is the structural representation of prefabricated flat-top supporting arch described in Fig. 1.
Among the figure: 1-direct channel lid, 2-calcining zone working lining, the brick arc of 3-top supporting arch, 4-support bracket, 5-flat-top supporting arch, 6-preheating zone, 7-calcining zone, 8-cooling zone.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Referring to Fig. 1 to Fig. 3, a kind of and two thorax kiln supporting arch structures of stream accumulation of heat, relate to a kind of bracket support type and flow the two thorax kiln supporting arch structures of accumulation of heat, body of heater is divided into preheating zone 6, calcining zone 7 and cooling zone 8, working lining 2 in the calcining zone 7 all uses high alumina matter or corundum fireproof brick, and support bracket 4 tops in cooling zone 8 are equipped with and are adopted sapphire whisker or steel fiber to strengthen high alumina matter or the prefabricated flat-top supporting arch 5 that forms of corundum pouring material.
Calcining zone working lining 2 all uses high alumina matter or corundum fireproof brick, because high alumina matter and corundum material are more much lower than magnesian to waterproof and dampproof requirement, therefore and the thermal shock resistance of high alumina and corundum material also is better than magnesian, heats up for baker and stops kiln and cause the susceptibility of big thermograde relatively poor.And the two temperature fields, thorax kiln calcining zone transverse section of stream accumulation of heat are very even, and the working conditions of its calcining zone working lining is much better than peripheral burner formula gas combusting limestone kiln.Periphery burner formula gas combusting limestone kiln exists local temperature up to the annular high-temperature zone more than 1200 ℃, and and flow the two thorax kiln calcining belt temperatures of accumulation of heat and be easy to control, and each section temperature can not meet or exceed 1200 ℃, periphery burner formula gas combusting limestone kiln is the calcining zone working lining with the high alumina brick, very abominable working conditions next time property furnace life can both reach more than 10 years, and the two thorax kilns of stream accumulation of heat disposable furnace life then can be longer.
The flat-top supporting arch 5 of the two thorax kilns of bracket support type adopts sapphire whisker or steel fiber to strengthen high alumina matter or corundum matter prefabricated section, supporting arch is pre-formed outside stove, and vault made the plane, integral hoisting is in place when building kiln, build calcining zone working lining 2 more above it by laying bricks or stones, thereby solved the arch brick problem that drops at all, special shaped brick kind quantity is reduced.
Specific implementation method is:
A, by the calcining zone working lining brick shape of intrinsic shape and size processing and fabricating except supporting arch, brick body material is selected high alumina matter or corundum matter for use;
B, by intrinsic brick arc top supporting arch size, pre-formed sapphire whisker or Stainless Steel Fibre enhancing high alumina matter or corundum matter flat-top supporting arch stove outside;
C, kiln lining is built support bracket end face place with the intrinsic kiln figure that builds, prefabricated flat-top supporting arch is hung in the kiln by the direct channel hole, and in place to two adjacent brackets tops.Behind the whole installation in position of prefabricated arch, check and adjust the position of prefabricated arch, identical with the design internal diameter to guarantee prefabricated arch ring place kiln internal diameter;
Calcining zone working lining of the present utility model is high alumina matter or corundum material, supporting arch is that sapphire whisker or Stainless Steel Fibre strengthen high alumina matter or the prefabricated flat-tope structure of corundum pouring material, can not ftracture in the use, fall the brick phenomenon, make and flow the two thorax kilns of accumulation of heat disposable furnace life to extend to more than 10 years by 6 years.
Example 1:Referring to Fig. 1 and Fig. 3, be example to produce 500 tons of bracket support types daily and to flow the two thorax kilns of accumulation of heat, at first by the former size design of building by laying bricks or stones, and strengthen high alumina castable with sapphire whisker and be prefabricated into flat-top supporting arch 5, processing and fabricating all brick shapes except supporting arch, and calcining zone brick body material is high alumina matter.
In newly-built or overhaul and when flowing the two thorax kiln of accumulation of heat, kiln lining is built support bracket 4 end face places with the intrinsic kiln figure that builds, prefabricated flat-top supporting arch 5 is hung in the kiln by direct channel hole 1, and in placely support brackets 4 to adjacent two and push up.Behind prefabricated flat-top supporting arch 5 whole installation in position, check and adjust the position of prefabricated arch, identical with the design internal diameter to guarantee prefabricated arch ring place kiln internal diameter; Continuation is upwards built by laying bricks or stones to furnace roof and is got final product by the intrinsic kiln figure that builds.
Example 2:Referring to Fig. 1 and Fig. 3, be example to produce 600 tons of bracket support types daily and to flow the two thorax kilns of accumulation of heat, at first by the former size design of building by laying bricks or stones, and strengthen corundum castable with Stainless Steel Fibre and be prefabricated into flat-top supporting arch 5, processing and fabricating all brick shapes except supporting arch, and calcining zone brick body material is corundum matter.
In newly-built or overhaul and when flowing the two thorax kiln of accumulation of heat, kiln lining is built support bracket 4 end face places with the intrinsic kiln figure that builds, prefabricated flat-top supporting arch 5 is hung in the kiln by direct channel hole 1, and in placely support brackets 4 to adjacent two and push up.Behind prefabricated flat-top supporting arch 5 whole installation in position, check and adjust the position of prefabricated arch, identical with the design internal diameter to guarantee prefabricated arch ring place kiln internal diameter; Continuation is upwards built by laying bricks or stones to furnace roof and is got final product by the intrinsic kiln figure that builds.

Claims (1)

1. one kind and flow the two thorax kiln supporting arch structures of accumulation of heat, body of heater is divided into preheating zone, calcining zone and cooling zone, it is characterized in that: the working lining in the calcining zone is equipped with the working lining of whole use high alumina matter or corundum fireproof brick, and the support bracket top in cooling zone is equipped with and is adopted sapphire whisker or steel fiber to strengthen high alumina matter or the prefabricated flat-top supporting arch that forms of corundum pouring material.
CN 201220745146 2012-12-31 2012-12-31 Parallel flow heat storage double chamber kiln support arch structure Active CN203033894U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103601376A (en) * 2013-11-18 2014-02-26 中冶焦耐工程技术有限公司 Sleeve type double-hearth shaft kiln
CN104211309A (en) * 2014-09-05 2014-12-17 石家庄新华能源环保科技股份有限公司 Suspended cylinder type parallel flow heat storage double hearth kiln
CN104973810A (en) * 2015-06-24 2015-10-14 天津二十冶建设有限公司 Twin-chamber limekiln masonry measuring and positioning method
CN107619205A (en) * 2017-10-11 2018-01-23 上海宝冶建设工业炉工程技术有限公司 Double thorax lime shaft kiln refractory lining combination units
CN109141015A (en) * 2017-06-15 2019-01-04 宝钢工程技术集团有限公司 Double-hearth lime kiln two close cycles temperature control equipment and its application method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103601376A (en) * 2013-11-18 2014-02-26 中冶焦耐工程技术有限公司 Sleeve type double-hearth shaft kiln
CN103601376B (en) * 2013-11-18 2015-04-15 中冶焦耐工程技术有限公司 Sleeve type double-hearth shaft kiln
CN104211309A (en) * 2014-09-05 2014-12-17 石家庄新华能源环保科技股份有限公司 Suspended cylinder type parallel flow heat storage double hearth kiln
CN104211309B (en) * 2014-09-05 2016-02-10 石家庄新华能源环保科技股份有限公司 A kind of suspension cylinder formula also flows the two thorax kiln of accumulation of heat
CN104973810A (en) * 2015-06-24 2015-10-14 天津二十冶建设有限公司 Twin-chamber limekiln masonry measuring and positioning method
CN104973810B (en) * 2015-06-24 2017-01-18 中冶天工集团天津有限公司 Twin-chamber limekiln masonry measuring and positioning method
CN109141015A (en) * 2017-06-15 2019-01-04 宝钢工程技术集团有限公司 Double-hearth lime kiln two close cycles temperature control equipment and its application method
CN107619205A (en) * 2017-10-11 2018-01-23 上海宝冶建设工业炉工程技术有限公司 Double thorax lime shaft kiln refractory lining combination units

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