US3790335A

US3790335A - Lined coolers for rotary kilns

Info

Publication number: US3790335A
Application number: US00242213A
Authority: US
Inventors: V Andreassen
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1971-04-08
Filing date: 1972-04-07
Publication date: 1974-02-05
Anticipated expiration: 1991-02-05
Also published as: CA972150A; ES401542A1; AU462341B2; DE2216781A1; ZA722123B; BE781820A; FR2136270A5; IT950979B; JPS5434779B1; BR7202057D0; AU4089672A; GB1292089A; SE383202B

Abstract

A junction piece for use in rotary kilns of the type having a plurality of planetary cooler tubes is disclosed in which the lining of the junction piece includes, at least in part, sections of monolithic material.

Description

United States Patent 1191 Andreassen Feb. 5, 1974 LINED COOLERS FOR ROTARY KILNS [56] References Cited [75] Inventor: Victor Paul Andreassen, UNITED STATES PATENTS c pen g y Denmark 3,502,311 3/1970 Jensen 432/80 [731 Assigneei Smidth & Cresskilh 5382'235 31132; 5235531: .3'1: H85 2 [22] Filed: Apr. 7, 1972 e Primary Examiner-John J Camby [211 App]' 242313 Attorney, Agent, or Firm-Pennie & Edmonds [30] Foreign Application Priority Data .[57] ABSTRACT Apr. 8, 1971 Great Britain 9,077/7] A junction piece for use in rotary kilns of yp v having a plurality of planetary cooler tubes is dis- [22] ES. Cll. ...i$..7432/80 closed in which the lining of the junction piece "t. C .v' 2 b l at least in t on o mo l thic ateri Field of Search 432/80, 78, 252

7 Claims, 3 Drawing Figures PAIENTEU 51974 3. 790.335

' sum 1 or 2 LINED COOLERS FOR ROTARY KILNS BACKGROUND OF THE INVENTION This invention relates to rotary kilns of the type which are equipped with cooler tubes arranged in planetary fasihion around the outlet end of the kiln for rotation with it to receive and cool the product such as cement clinker from the kiln by air flowing through the tubes in countercurrent to the product. These cooler tubes are generally connected to the kiln by radial chutes through which the product falls and slides.

The kiln and the cooler tubes are formed by metal shells lined by heat-resisting material. At least in the hot end of each cooler tube the lining consists conventionally of fire bricks and is normally interrupted by iron sections which are welded to the walls of the tube and abut against the sides of the adjacent bricks.

Now the hot ends of the cooler tubes are subjected in operation to considerable thermal and mechanical stresses, the thermal stresses arising from continually alternating heating and cooling, and the mechanical stresses from the action of the hot product from the kiln, which partly slides down and partly falls into the cooler tubes. At points where the fire bricks abut against the iron sections gaps are formed on cooling, and some of the kiln product may enter these gaps. When the temperature rises again the gaps tend to close and jam the kiln product, with the result that the brick lining breaks. Also, there is a tendency for at least a part of the brick lining onto which the product falls to be broken from time to time by the impact of the hot kiln product. These disadvantages of the conventional brick lining are well known, and they result in the need to stop the kiln and repair the damaged lining from time to time.

SUMMARY OF THE INVENTION According to this invention each cooler tube is connected to the kiln by a separate junction piece registering at one end with an opening in the kiln and being secured at the other end to the cooler tube proper, part at least of the lining of each junction piece being monolithic.

The monolithic lining consists of a mass of heatresistant material cast or tamped into position and hydraulically or chemically set. When the hot end of each cooler tube and the chute connecting it to the kiln have been united so as to form a separate junction piece the object has been to facilitate the provision of such monolithic lining, before the junction piece is connected to the cooler tube proper and to the kiln.

The mass forming the monolithic lining may advantageously be anchored in position by being reinforce welded to the shell of the junction piece and embedded in the mass.

The whole lining mayadvantageously be monolithic, since although it may not have the mechanical strength of a fire brick it will resist wearing down for a longer time than a fire brick lining will resist destruction by crushing. However, the lining may be composite. In

. other words, it may consist, in part, of sections of fire bricks interrupted by monolithic sections which allow of expansion or contraction of the fire brick sections without presenting the disadvantage that gaps open between them and the fire bricksections on cooling.

The monolithic mass may be composed of any suitable refractory material, for example, sand or crushed brick, and may be set hydraulically, in which case aluminous cement may advantageously be used as a binding agent, or may be set chemically, in which case phosphoric acid may advantageously be used as the binding agent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows diagrammatically part of a kiln and some planetary cooling tubes;

FIG. 2 is a diagrammatic section on the line 2-2 in FIG. 1; and,

FIG. 3 is a cross-section on the line 3-3 in FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1.shows the general arrangement of typical planetary cooler tubes spaced around a kiln 1. As shown in FIG. 2, the kiln 1 has openings 17 in its wall and hollow spigots 2 around these openings. Junction pieces 3, each including a radial chute 4, are mounted to register with the openings 17, and, each junction piece also includes a part 18 'with a mouth that registers with the corresponding cooler tube.

The cooler tube 5 is lined by fire brick 6, and it has an end flange 19 which mates with a corresponding flange 20 on the junction piece 3, the junction piece being held firmly in position by bolts passing through the

flanges

19 and 20. The kiln shell 7 is lined by fire brick 8, and the opening 17 is similarly lined by fire brick 21. The junction piece is not actually secured to the spigot 2, but its end lies within a ring 22 which is bolted to the spigot 2, the arrangement permitting radial expansion and contraction of the chute 4 on heating and cooling. At ,what may be regarded as the corner 23 the junction piece presents a flat lens-shaped surface externally.

The junction piece shown is lined partly monolithically and partly of fire brick. Fire brick sections are indicated generally by

reference numerals

9, 10, 11 and 12, and monolithic sections by reference numeral 13. In FIG. 3 the parts of the lining that consist of fire brick and that are visible to the eye of an observer at the section line 3-3 are indicated by intersecting lines, while those parts that are monolithic are shown plain. Iron reinforcement members 14, 15 and 16 are welded to the shell of the junctionpiece and embedded in the adjacent monolithic material.

In forming the lining it is advantageous to put the fire brick sections in position first and to retain them by shallow flat irons 24 before and during the casting of the monolithic sections. These irons 24 become wholly embedded in the adjacent monolithic material.

While with the construction shown in the drawings the lining is a composite one comprising partly fire brick and partly a monolithic material, it is to be recognized that the entire lining may be monolithic.

I claim:

1. In a rotary kiln of the cooler tubes arranged in a planetary fashion around the outlet end of the kiln for rotation with the kiln, at least one junction piece having first and second open ended sections substantially perpendicular to each other, said first section being flanged and secured by bolt means to the corresponding cooler tube with the open end in communication therewith, and said second section communicates with an opening in the kiln and extends substantially radially from the kiln to the first section type having a plurality of 4 monolithic sections of the lining.

5. The junction piece according to claim 3 including retaining members for the fire brick sections of the lining embedded in the adjacent monolithic material.

6. The junction piece according to claim 2 including at least one reinforcement member embedded in the monolithic sections of the lining.

7. The junction piece according to claim 4 including retaining members for the fire brick sections of the lining embedded in the adjacent monolithic material.

I i I I v

Claims

1. In a rotary kiln of the type having a plurality of cooler tubes arranged in a planetary fashion around the outlet end of the kiln for rotation with the kiln, at least one junction piece having first and second open ended sections substantially perpendicular to each other, said first section being flanged and secured by bolt means to the corresponding cooler tube with the open end in communication therewith, and said second section communicates with an opening in the kiln and extends substantially radially from the kiln to the first section in a manner which permits radial expansion and contraction of said second section, said junction piece having at least a portion thereof lined with monolithic material.

2. The junction piece according to claim 1 in which the entire lining is monolithic.

3. The junction piece according to claim 1 wherein a portion of the lining includes sections of fire bricks spaced apart by sections of monolithic material.

4. The junction piece according to claim 3 including at least one reinforcement member embedded in the monolithic sections of the lining.