DE1646918C - Process for burning or sintering lime, dolomite, magnesite and similar goods - Google Patents

Description

The invention relates to a V.; ■ driving to coarse material is exposed and as a result when

Firing or sintering of lime, dolomite, magnesite 30 Entry into the rotary kiln already more strongly deacidified

and similar goods in lump form, where that is called the coarse goods.

Well getrock first on a first traveling grate - A particularly useful embodiment of the net and pre-fired, then in a rotary kiln process according to the invention provides that the Finished or sintered and finally on Gut after leaving the rotary kiln before Aufein second traveling grate is cooled and 35 would be on the traveling grate cooler through one of the the cooler exhaust air of the second traveling grate as cooler exhaust air bypassed cooking zone ^; leads. Secondary air is fed to the rotary kiln, in such a cooking zone there is a good whose exhaust gases are fed to the first traveling grate, a distinction is made between the heat exchange between good particles, Licher temperature, especially between coarse and

It is known that lime, dolomite, mag- ^ sit and ahn- 40 fine material. The resulting good uniformity

Burning goods in a rotary kiln is particularly useful if the

the moist, neither dried nor pre-fired end product meets very high quality requirements

Well introduced immediately. Be created in operation.

like plants shows that the goods can be

Circulating motion in the rotary kiln is an important aspect of the method according to the invention

borrowed abrasion is exposed, so that illustrates a drawing for many.

Applications (for example when loading the system contains a first traveling grate 1, steel converters with lump lime) undesirable, a rotary kiln 2 and another Wanderhoher Dust content results. rust 3. Between the rotary kiln 2 and your

A cooking zone 4 is located around the abrasion and the development of dust in the traveling grate 3.

To reduce the rotary kiln, one still has to The material to be burned, for example lime, is

A process has already been developed in which the goods are divided into two layers of different pieces

first dried on a traveling grate and placed in front of the traveling grate 1. The coarse material 5 forms

is fired before the rotary kiln is given the lower layer and the fine material 6 the upper

will. This procedure is compared to the previous 55 shift.

explained solution already an essential tech- On the traveling grate 1 the goods are dried,

niche progress. How more detailed investigations have been pre-burned and in some cases already deacidified,

showed, but this process is still possible. Then the material enters the rotary kiln 2, in

has a troublesome disadvantage. the rest of the deacidification takes place. The cooking

The material to be burned or to be sintered has zone 4 in the 60 zone which results in a further equalization of the

generally a different lumpiness (i.e. temperature of the goods. On the traveling grate 3

different grain sizes). You can now see that the goods have finally cooled.

The cooling air permeates the material on the traveling tube furnace during the uni-rolling movement of the goods the fine material mainly flows inside the grate 3 from bottom to top (arrows 7) Bulk material and the coarse material more in the outer 65 then bypassing the cooking zone 4 the turning area de circulated material is located. In-pipe furnace 2 closed.

special is in the area of the surface of the rotary kiln. The exhaust gases of the rotary kiln 2 (arrow 8) rotary kiln the bulk of the material located in the first place in the hot chamber 9 of the hiking

Grate 1 the goods from top to bottom (arrow 10), then the drying chamber 11 of the traveling grate 1 and enforce the one on the traveling grate 1 in a second pass Good layer again from top to bottom (arrow 12).

The two chambers can, however, also under special Circumstances, e.g. B. with dry feed material to be combined into a chamber, so that the furnace exhaust gases flow through the material layer from top to bottom only once.

Since the fine material 6 forms the upper layer on the traveling grate 1, it becomes stronger than the coarse material S in the lower layer exposed to the effects of heat from the rotary kiln exhaust. It gets there as a result more deacidified than the coarse material in the rotary kiln 2, where for the reasons set out above the coarse material is exposed to stronger heat

the hot gases penetrating the rotary kiln 2 (arrow 13) is exposed.

A plant for burning lime can, for example

have the following data:

Grain size of the fine material

(top layer) 5 to 10 mm

Grain size of the coarse material

(lower layer) 10 to 30 mm

Thickness of the top layer 10 cm

Thickness of the lower layer 20 cm

Temperature of the rotary kiln exhaust gases 900 to 1100 °

Temperature of the goods at

Rotary kiln discharge ... 1000 to 1200 °

Residence of the property in the

Cooking zone 5 'is 10 minutes

1 sheet of drawings

Claims (2)

there is more coarse material than fine material (which is likely to be related to patent claims: that the fine material finds its way more easily in the constant overturning movement 1. Look for a method for firing or sintering the lower area of the bed of material Lime, dolomite, magnesite and the like in 5 can be used as the coarse material). This appearance has now lumpy shape, with the product initially resulting in the known method being raised first traveling grate dried and present parts of the fine material in the rotary kiln nichi burned, then finished in a rotary kiln - enough burned or sintered, but Fired or sintered and finally one on top of another at the discharge end of the rotary kiln Traveling grate is cooled and the io have a substantial CGv residual content. Cooler exhaust air of the second traveling grate as the invention is therefore based on the object. Secondary air is supplied to the rotary kiln, avoiding this disadvantage a method train its exhaust gases fed to the first traveling grate of the type mentioned so that also are, characterized in that with different pieces of the goods one, andas Good in at least two layers with almost even deacidification of coarse material and Different lumpiness is achieved in this way at first fine material. Traveling rust is raised that the fine material This task is thereby geüber according to the invention the coarse material is located. solves that the goods are divided into at least two layers. 2. The method according to claim 1, characterized by different lumpiness in this way on the first wall indicates that the material is placed on the rust after leaving 20 that the fine material is over of the rotary kiln before the task on the wandering the coarse material b. nd. grate cooler by one of the cooler exhaust air. For the reasons set out above, it can be used cooking zone is guided. not to be avoided when using a rotary kiln, that in this the coarse material undergoes a somewhat more intensive heat treatment than the fine material. According to the invention, however, this is counteracted in that the fine material is placed on the traveling grate more intense heat treatment than that