CN201245560Y

CN201245560Y - Cocurrent heat storing type dual-chamber limekiln capable of realizing two-stage calcination

Info

Publication number: CN201245560Y
Application number: CNU2008200534367U
Authority: CN
Inventors: 何志雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-06-14
Filing date: 2008-06-14
Publication date: 2009-05-27
Anticipated expiration: 2018-06-14

Abstract

A parallel-flow regenerative double-chamber lime kiln capable of two-stage calcination, including two parallel kiln chambers, each kiln chamber has a kiln shell, refractory insulation layer, kiln top is equipped with a hopper, feeding Valve and distributor; the upper part of the kiln chamber is a preheating zone, and the preheating zone is equipped with a combustion-supporting air inlet pipe and gas spray guns with the outlet facing downward; the middle part of the kiln chamber is a calcination zone, and the lower part of the calcination zone is connected to the two kilns. The lower part of the kiln chamber is a cooling belt, and the lime hopper and ash discharge machine are installed in turn below it, and the upper part of the lime hopper has a cooling air inlet pipe. The improvement is that a gas heat-resistant burner is installed between the ring channel and the top of the cooling belt. Mouth. The utility model is calcined in two stages. Compared with the existing parallel-flow regenerative double-chamber lime kiln, the utility model improves the volume coefficient and lime quality, reduces heat consumption, electric energy consumption and investment, and can make full use of various recycled energy sources. Further reduce production costs.

Description

A kind of that can realize two-section calcining and flow the heat accumulating type double-hearth lime kiln

Technical field

A kind of kiln class device that limestone calcination is become lime.

Background technology

And stream heat accumulating type double-hearth lime kiln has unique two thorax structures, and two kiln thorax can alternately be realized calcining, heat accumulation function, so has the incomparable technological advantage in other limestone kiln---activity of lime is the highest and fuel consumption is minimum.This limestone kiln is extensively promoted in the whole world because of its unique power savings advantages.China's metallurgy industry is since the eighties is introduced and flowed heat accumulating type double-hearth lime kiln (representative has wheat Wurz kiln and two D kilns), obtained consistent approval of vast lime manufacturing enterprise, now domestic producing and build and flow the heat accumulating type double-hearth lime kiln above 50.

There are two parallel kiln thoraxes of existing side by side in this limestone kiln, and in the time of a kiln thorax lime kilning, another kiln thorax makes the Wingdale accumulation of heat, promptly calcines and hold expansion pad flow process to be hocketed by two kiln thoraxes.When so-called and stream was meant the gas-fired calcined limestone, products of combustion and lime flowed downward together side by side.So-called accumulation of heat is meant products of combustion---high-temp waste gas enters another kiln thorax and upwards mobile by the circular channel of two kiln thorax bottoms from a kiln thorax, and the Wingdale that will be in the preheating zone, kiln top is preheating to comparatively high temps, and heat is put aside.The high-temp waste gas temperature dropped to one and discharged the kiln thorax behind the low value very much this moment.Therefore, advantage present and that flow the heat accumulating type double-hearth lime kiln is to make full use of high-temp waste gas, energy-conserving and environment-protective.Its weak point is that process energy consumption is low but power consumption is higher, volumetric efficiency is not high, ton product-specific investments height.

Summary of the invention

The purpose of this utility model provides a kind of that can realize two-section calcining and flow the heat accumulating type double-hearth lime kiln, accomplishes the volumetric efficiency height, keeps reducing power consumption under the low prerequisite of process energy consumption, further reduces production costs.

The utility model includes two parallel kiln thoraxes, and each kiln thorax all has kiln shell, fire-resistant material heat insulation layer, and kiln is top-loaded with hopper, feed valve and distributor; Kiln thorax top is the preheating zone, the combustion air inlet pipe is housed in the preheating zone and goes out mouth down, equally distributed coal gas spray gun; Kiln thorax middle part is a calcining zone, and the circular channel that two kiln thoraxes are communicated with is arranged at the calcining zone bottom; Kiln thorax bottom is a cooling zone, and its underpart is equipped with lime bucket, ash hoist successively, and the cooling air inlet pipe is arranged at lime bucket top, and improvements are to be equipped with between circular channel and the cooling zone top the heat-resisting burner of coal gas.

The principle of work that realizes two-section calcining is as follows:

In the calcining kiln thorax, burner blower blows into kiln thorax preheating zone with combustion air, helps and burns air on one side toward current downflow, Yi Bian be in the hot lime preheating of preheating zone.When helping warm air to arrive calcining zone, mix and fierce burning with the coal gas that the coal gas spray gun is carried into.Coal gas flows downward with the products of combustion and the Wingdale of air, and promptly and stream, and stream can make combustion flame directly contact with raw material limestone, and calcined limestone makes its part decomposition under very high heat exchanger effectiveness.When the Wingdale of part decomposition arrives the upper end, circular channel, the combustion exhaust temperature reduces relatively, the coal gas of circular channel below burner ejection at this moment runs into and comes up at the bottom of the kiln and through the cooling air afterfire of lime preheating, calcined limestone makes Wingdale complete calcining and decomposing under the temperature uniform state for the second time.

After calcining was finished, the lime of generation entered cooling zone, contacts with the cooling air that infeeds at the bottom of kiln, carries out Re Jiaore, makes the lime temperature drop to 60～80 ℃, enters the lime bucket at last, draws off through ash hoist again.

Because the calcining kiln thorax is in barotropic state, under the ordinary production situation, its place, circular channel pressure remains between 15～25Kpa, and is that the calcining kiln gun pressure is powerful strong in accumulation of heat kiln gun pressure all the time, so the high-temp waste gas at place, circular channel flows to accumulation of heat kiln thorax.

In accumulation of heat kiln thorax, high-temp waste gas rises from lower to upper, passes calcining zone and arrives the preheating zone, contacts with the Wingdale that is in the preheating zone and drives capable heat exchange into.Waste gas discharges waste heat to Wingdale, and self temperature drops to 120～180 ℃, discharges from the kiln top again.

Compared with the prior art, the utility model has following characteristics:

1, volumetric coefficient and lime quality have been improved.

Two-section calcining is not carried on a shoulder pole the calcination efficiency that has improved the calcining kiln thorax, make decomposition of limestone more abundant, more even, improve lime quality, and make accumulation of heat kiln thorax possess part calcining function, make volumetric efficiency higher.

2, reduced hear rate.

Carry out combustion-supportingly owing to be used to cooling air at the bottom of kiln, so the content of surplus air greatly reduces in the waste gas, and hear rate is lower.

3, power consumption and investment have been reduced.

Owing to be used to the air-breathing at the bottom of kiln, can reduce gas gross and furnace pressure in the kiln significantly, the combustion air demand that is blown into by the preheating zone is significantly reduced, therefore can significantly reduce power consumption and power index, saves energy and the investment of burner blower, lime cooling blower, spray gun cooling blower, gas compressor and dedusting induced draft fan.

4, make full use of the various recovery energy, further reduce production costs.

Because adopt the two-section calcining mode, coal gas is supplied at twice, temperature can twice lifting, and therefore less demanding to fuel can use from the out of use low calorie fuels of external introduction kiln type, and for example blast furnace gas etc. makes full use of the various recovery energy.

Description of drawings

Fig. 1 be can realize two-section calcining and flow heat accumulating type double-hearth lime kiln master TV structure synoptic diagram.

Embodiment

The utility model includes two parallel kiln thoraxes, and each kiln thorax all has kiln shell 1, fire-resistant material heat insulation layer 2, and kiln is top-loaded with material 11, feed valve 12 and distributor 3; Kiln thorax top is preheating zone 4, combustion air inlet pipe 5 is housed in the preheating zone 4 and goes out mouth down, equally distributed spray gun 6; Kiln thorax middle part is a calcining zone 7, and the circular channel 8 that two kiln thoraxes are communicated with is arranged at calcining zone 7 bottoms; Kiln thorax bottom is a cooling zone 9, and its below is equipped with lime bucket 13, ash hoist 14 successively, and cooling air inlet pipe 15 is arranged at lime bucket 13 tops, and difference is to be equipped with between circular channel 8 and cooling zone 9 tops heat-resisting burner 10 of coal gas.

Claims

1. A parallel-flow regenerative double-chamber lime kiln capable of two-stage calcination, including two parallel kiln chambers, each kiln chamber has a kiln shell (1) and a refractory insulation layer (2), The top of the kiln is equipped with a hopper (11), a feed valve (12) and a distributor (3); the upper part of the kiln chamber is a preheating zone (4), and the preheating zone (4) is equipped with a combustion air inlet pipe (5) and an outlet The gas spray guns (6) are uniformly distributed downward; the middle part of the kiln chamber is a calcination zone (7), and the lower part of the calcination zone (7) has an annular channel (8) connecting the two kiln chambers; the lower part of the kiln chamber is a cooling zone (9) , the lime hopper (13) and ash discharger (14) are arranged in sequence below it, and the cooling air inlet pipe (15) is arranged on the upper part of the lime hopper (13), and the characteristic lies in the gap between the annular channel (8) and the top of the cooling belt (9). A gas heat-resistant burner (10) is installed between them.