Process for the thermal and/or chemical treatment of grained, gr

Details Process for the thermal and/or chemical treatment of grained, gr Process for the thermal and/or chemical treatment of grained, gr

1985-11-22

1987-11-24

Yuen, Henry C.

Heating

Shaft type

432 98, 432 14, F27D 108

Patent

active

047086424

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application of No. PCT/EP85/00115 filed Mar. 16, 1984 and based upon a German application of Mar 24, 1984 No. P 34 10896.3 under the International Convention.


FIELD OF THE INVENTION

The invention relates to a process and an installation for the thermal and/or chemical treatment of grained, granular or lump material in heaps, wherein the heaps are arranged in a plurality in a shaft one above the other and separated by free intermediate spaces provided between them, and, after a predetermined period of time spent on each level, the heaps are tranported in stages traversing the shaft from top to bottom starting respectively with the lowest heap and are acted upon in the shaft by gases or vapors introduced in the intermediate spaces.


BACKGROUND OF THE INVENTION

A process and an installation to carry out the process such as a burning shaft for cement, limestone, gypsum or the like are known (German Pat. No. 31 932), wherein the shaft interior and the column of material in the shaft interior which completely fills the shaft are subidivided by grate-like divider walls which can be extracted laterally from the shaft walling, forming chambers filled with material lying between grates arranged on top of each other. The combustion gases introduced into the shaft interior under the lowest grate traverse from bottom to top all the chambers, respectively the material in the chambers. When the material present on the lowest grate-like divider wall, such as limestone or the like is sufficiently burnt, the material is discharged by extracting laterally the subdivided lowest divider grate, before the following chamber load is transferred in the burning area to the lowest burning grate after the closing of this grate and subsequently thereto all the chamber loads above it are transported to one level below and the top dividing grate is again filled with material.
This way it is assumed that a continuous operation of the shaft furnace is made possible.
In this known process only a low flow velocity of the combustion gas with respect to the material column they have to traverse can be attained, which leads to the fact that the materials spend a long time on each individual level.
Besides, the process is limited to the treatment of such materials wherein the combustion gases can also be used for the preheating. Finally, bridging and thereby caused irregularities in the flow are unavoidable, whereby especially the bridging in the burning area can have correspondingly disadvantageous effects due to flow irregularities on the chambers located above, particularly in what the even preheating of the material is concerned. Finally, it is quite difficult to completely discharge the load of the respective upper chamber and to completely fill the lower chamber by laterally extracting the subdivided grate from the shaft wall. The irregularities occuring during this operation cause additional irregularities in the heating of the material within the individual cross-sectional-levels of the shaft. Due to the fact that the combustion gas is introduced exclusively from the bottom, a very high shaft results, which again has to lead to a further reduction of the flow velocity of the combustion gas and to the thereto connected disadvantages.
It also has become known to treat porous additives made of swellable materials in the manner afore-described (German published specification No. 1 165 477). Thereby, the crushed material, such as clay or oil shale, is charged into chambers of a shaft arranged one on top of the other and each chamber is only partially filled. The chamber bottoms are made of lamellae rotatable around their longitudinal axis. Between the heap in the respective chamber and the bottom of the following chamber located above it, there is an intermediate clearance and the combustion gases produced by burners arranged laterally on the shaft walling are fed into these spaces. Thereby, a mechanical loosening of the heap is also performed in order to avoi

REFERENCES:
patent: 648933 (1900-05-01), Edison
patent: 2451024 (1948-10-01), Ellerbeck
patent: 4256451 (1981-03-01), Johnson, Jr.

Affiliated with

Also associated with

Rating

Process for the thermal and/or chemical treatment of grained, gr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the thermal and/or chemical treatment of grained, gr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the thermal and/or chemical treatment of grained, gr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2422684