AU2007218923B2

AU2007218923B2 - A rotary kiln

Info

Publication number: AU2007218923B2
Application number: AU2007218923A
Authority: AU
Inventors: Zhiqing Ding; Xinhua He; Wenhui Li; Deyi Ning; Weimin Shen; Saihui Wang; Dan Zhou; Fei Zhu
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2006-02-22
Filing date: 2007-01-29
Publication date: 2010-06-17
Anticipated expiration: 2027-01-29
Also published as: CN100427867C; AU2007218923A1; BRPI0707020B1; BRPI0707020A2; UA90051C2; WO2007095831A1; CN1811312A

Description

OP08080566 A Rotary Kiln FIELD OF THE INVENTION [0001] The present invention relates to a rotary kiln, specifically to an improvement in the lining structure thereof, which is mainly applied to roasting devices used in fields of metallurgy, chemical engineering and building materials, etc. BACKGROUND OF THE INVENTION [00021 In general, two common masonry methods for an inner lining of the rotary kiln are used in the prior art, one of which is to employ refractory bricks and to lay them in a staggered joint or circumferential joint manner. This method has the following disadvantages: 1) since the wedge-shaped refractory bricks have small width difference between the two ends thereof, the junction property between the bricks is poor and the bricks are easy to drop off; 2) the masonry requires a tight tolerance in the dimension of the bricks; 3) the construction difficulty is high and the construction period is long due to the small brick joint; and 4) with the time elapsed, the bricks are easy to drop off and then a collapse accident would occur when the abrasion loss of the bricks reaches a certain extent. The other method involves a combination of pre-manufactured anchoring bricks and grout material, i.e. one zone of the pre-manufactured anchoring bricks combined with one zone of grout material. This method also has the following disadvantages: 1) the pre-manufactured anchoring bricks are welded with a kiln shell by means of the outer extension portions of their built-in tendons, whereas in the grout material zone grouting is preformed before anchoring members are welded, such that the built-in tendons of the pre-manufactured anchoring bricks are located relatively close to the high temperature region, and the heat transfer is significant and the temperature of the cylinder is increased, thus the loss of heat is high; 2) the heat expansion coefficient of the built-in tendons of the pre-manufactured anchoring bricks is different from that of the refractory material, such that the expansion of the 2 tendons damages the pre-manufactured blocks and adversely affects the life time of the pre-manufactured blocks; and 3) the production process is sophisticated, the production period is long and the production costs are high. 5 Object of the Invention It is the object of the present invention to substantially overcome or ameliorate one or more of the disadvantages of the prior art. Summary of the Invention 10 The present invention provides a rotary kiln including a cylinder, a heat insulating layer and a lining, wherein said lining comprises refractory bricks fixed onto the cylinder by anchors, wherein hook holes and hook concaves are provided on each of two junction surfaces of the refractory brick whose mounting position coincides with a longitudinal axis of the cylinder of the rotary kiln, wherein one end of the anchor is is provided with two hooks, said hooks being hooked into respective hook holes of two adjacent refractory bricks and the other end of the anchor is a welding body welded on the cylinder, and wherein a circumferential joint of the refractory bricks is sealed with grout material or joint bricks. Preferably, anchor pins are provided within said grout material, and are welded 20 and fixed on the cylinder. Preferably, two adjacent surfaces among four junction surfaces of said refractory brick are provided with wedge-shaped recesses for a convex-concave engagement between two adjacent bricks and the other two surfaces are provided with wedge-shaped projections. 25 Preferably, said refractory brick is in the form of a cuboid or a cube with an isosceles trapezoid cross section. Preferably, said heat insulating layer includes a refractory fibrofelt. Brief Description of the Drawings 30 A preferred embodiment of the present invention will now be described, by way of an example only, with reference to the accompanying drawings wherein: Fig. I is a cross sectional view of the present invention; Fig. 2 is a sectional view taken along line A-A in Fig. 1; Fig. 3 is a front elevation of a refractory brick according to the present invention; 35 Fig. 4 is a left view of the refractory brick; 3 Fig. 5 is a front elevation of an anchor according to the present invention; Fig. 6 is a left view of the anchor; and Fig. 7 is a top view of the anchor. 5 Detailed Description of the Invention As shown in Figs. 1 and 2, a rotary kiln of the present invention includes a cylinder 1, a heat-insulating layer 2 and a lining. The lining comprises refractory bricks fixed onto the cylinder I by anchors 4. A hook hole 31 and a hook concave 32 (see Fig. 3) are respectively provided on each of two junction surfaces of the refractory brick 3 whose 1o mounting position coincides with the axis of the cylinder of the rotary kiln. As shown in Fig. 5, 6 and 7, one end of the anchor 4 is provided with two hooks 41 to be respectively hooked into said hook holes 31 of two adjacent refractory bricks, and the other end of the anchor 4 is designed as a welding body 42 to be welded on the cylinder 1. A circumferential joint of the refractory bricks 3 is filled with grout material 5. Anchor pins 6 to be welded and fixed on the cylinder 1 are provided within the grout material 5. As shown in Figs. 3 and 4, two adjacent surfaces among the four junction surfaces of the refractory brick 3 are provided with wedge-shaped recesses 33 for a convex-concave engagement between the bricks, and the other two surfaces are provided with wedge-shaped projections 34. The refractory brick 3 are designed to be in the form of either a cuboid with an isosceles trapezoid cross section or a cube with an isosceles trapezoid cross section. The heat insulating, layer 2 is structured by a refractory fibrofelt. According to, the present invention, since each of the bricks is fixed to the cylinder of the rotary kiln through the anchors and the anchors for fixing the bricks are located relatively far away from the high temperature region, less heat is conducted, and in particular, the heat insulating-layer filled between the cylinder anSI the refractory bricks enables the loss of heat to be decreased. The refractpry bricks are made by press forming with machinery and then roasting at high temperature, thus the refractory bricks are of high strength and of long useful life,,at the same time, the refractory bricks have a short production period and the production costs thereof are accordingly decreased. The refractory lining of the whole rotary kiln requires less grouting on site, thus the construction, repairing and maintenance are easy to perform. Moreover, since the four junction surfaces of the refractory brick are provided with wedge-shaped recesses/projections, a close engagement between the bricks is achieved and the integrity is excellent. In addition, the entire sealing property of the lining is improved, and the possibility is reduced that the lining is damaged in large-scale resulting from the damage of a few refractory bricks. Thus, the useful life of the lining and also the useful life of the whole rotary kiln are prolonged, and the economic efficiency is improved. 4

Claims

1. A rotary kiln including a cylinder, a heat insulating layer and a lining, wherein said lining comprises refractory bricks fixed onto the cylinder by anchors, 5 wherein hook holes and hook concaves are provided on each of two junction surfaces of the refractory brick whose mounting position coincides with a longitudinal axis of the cylinder of the rotary kiln, wherein one end of the anchor is provided with two hooks, said hooks being hooked into respective hook holes of two adjacent refractory bricks and the other end of the anchor is a welding body welded on the cylinder, and wherein a 1o circumferential joint of the refractory bricks is sealed with grout material or joint bricks.

2. The rotary kiln according to Claim 1, wherein anchor pins are provided within said grout material, and are welded and fixed on the cylinder.

3. The rotary kiln according to Claim I or 2, wherein two adjacent surfaces among four junction surfaces of said refractory brick are provided with wedge is shaped recesses for a convex-concave engagement between two adjacent bricks and the other two surfaces are provided with wedge-shaped projections.

4. The rotary kiln according to Claim 3, wherein said refractory brick is in the form of a cuboid or a cube with an isosceles trapezoid cross section.

5. The rotary kiln according to any one of the preceding claims, wherein 20 said heat insulating layer includes a refractory fibrofelt.

6. A rotary kiln substantially as hereinbefore described with reference to any one of the embodiments as that embodiment is shown in the accompanying drawings. Dated 19 May 2010 25 Zhongye Changtian International Engineering Co., Ltd Patent Attorneys for the Applicant/Nominated Person SPRUSON & FERGUSON