CS265010B1 - Manhole preheater with cross connection of cyclone stages - Google Patents

Abstract

Shaft preheater with cross-connection of cyclones, its essence lies in the fact that the gases from the dispersion shaft are led through successively arranged heat exchange stages in two parallel branches, while the powdered material is, in order to more effectively utilize the heat of the hot gases, led through all cyclone stages, belonging to one or the other parallel branch, and from the last cyclone stage it is led into the dispersion shaft.

Description

The invention relates to a shaft preheater of powdered material, with cross-connection of cyclone stages _r; eg cement. raw materials, powdered limestone, magnesite etc.

Existing shaft preheaters of this type are designed in such a way that two dispersion shafts are connected to two heat exchange stages arranged in terms of conduction of hot gases into two branches.

Each heat exchange stage consists of a pair or four vertical cyclone stages. Preheated powdered "material? E is guided by these heat transfer process stage then _r his whole amount passes through the 'cyclone stages or dyojicemi, belonging alternately to one or the second parallel branch, and after passing through the cyclone stages all' or a pair is introduced into. dispersion shafts, where further intensive heating takes place

The disadvantage of these preheaters is, despite their high thermal efficiency, a considerable pressure loss of the cyclic. parts, hence the increased power consumption of the exhaustor.

This disadvantage is overcome by the shaft preheater. The invention is based on the fact that at least one heat exchange stage uses horizontal cyclone stages whose pressure drop is up to 50% lower than that of conventional vertical stages.

By suitable construction, horizontal cyclone.

The number of arcs in the gas connecting ducts * can be reduced by further decreasing the pressure drop. When the horizontal cyclone stages are included in the heat exchange stage,

- 2.

26ρ 0] 0 directly adjacent to the dispersion shafts can be both heat exchangeable. The height of the preheater can be reduced in one plane, thereby reducing the construction height of the preheater, which also saves investment and operating costs for the conveying paths of the powdered material.

An exemplary embodiment of a shaft preheater according to the invention is shown in the drawing. The preheater, which is part of the cement clinker firing production line, consists of a dispersion shaft 2, followed by two heat exchange stages * The first heat exchange stage 2 consists of a pair of horizontal cyclone stages 2 and the second heat exchange stage J consists of a pair of vertical cyclone stages j > ·

In terms of gas conduction, the cyclone stages 4 and the parallel juxtaposed form parallel branches connected to the dispersion shaft 2, each of which is provided with an inlet (j of the powder material).

The first horizontal cyclone stage J of the first heat exchange stage 2 is connected to the gas inlet channel 8 of the second horizontal cyclone stage 2 ' corresponding to the parallel branch of the same first heat exchange stage 2 " This second horizontal cyclone stage 2 is connected by a chute 7 'of the powdered material to the gas inlet channel 8 of the first vertical stage. % of the second heat exchange stage This first vertical cyclone stage 2 is slipped 2 of the powdered material with the gas inlet channel 8 of the second vertical stage 2 »corresponding to the parallel branch of the same second heat exchange stage 2. upper part of dispersion shaft 2 *

The hot gases entering the lower part of the dispersion shaft 2, after passing through the dispersion shaft 2, are separated into two branches and the cyclone stages j and 2 are connected successively.

326 < 0 > C of the cyclone stage J, which also belongs to the first heat exchange stage. where the two portions of the powdered material to be mixed, which, after being separated from the gases, are mixed in this second horizontal cyclone. step J. introduced. by sliding 7 of the powdered material into the inlet channel 8 of the first vertical cyclone stage% of the opposite branch, corresponding to the second heat exchange stage 3, from which it is the same;

introduced into the inlet channel 8 gases of the last vertical?

5 ₎ from which the sliding% of the powdered material into the?

taken into the upper part of the dispersion shaft J, and after its passage, the preheated chamber is discharged from the preheater »

Since the first heat exchange stage 2 consists of a pair of horizontal cyclone stages 4, which exhibit a lower pressure drop than the vertical cyclone stage, the pressure loss of the preheater is reduced, also with regard to the horizontal discharge of the off-gases. , which in comparison with the vertical cyclone stages 5, saves one pair of rectangular arcs. and

Claims (1)

A shaft preheater with a cross-connection of cyclone stages, consisting of a dispersion shaft and the adjoining shaft. at least two: heat exchange stages consisting of: a double or quadruple cyclone stages forming two parallel branches for gas conduction, each having a powder feed, the first cyclone stage or a pair of cyclone stages corresponding to the first heat exchange stage of one the branch is coupled to the gas inlet passage of the second cyclone stage or a pair of cyclone stages of the same first heat exchange stage of the second branch, said second cyclone stage or pair of cyclone stages coupled to the gas inlet passage of the first cyclone stage or pair of cyclone degrees of the first branch of the second heat exchange stage, wherein the chute of the powder material from the first cyclone stage of the second heat exchange stage is connected to the inlet channel pl The second cyclone stage of the second heat exchange stage, whose slip of the powdered material is led into the dispersion shaft of the shaft preheater, characterized by: that at least one of any heat exchange stages (2, 3) is composed of a pair or four horizontal cyclone stages (4) _e