SU851057A1 - Rotary furnace seal - Google Patents

Description

(54) SEALING ROTATING FURNACE

The invention relates to compaction of rotary kilns for the firing of cement clinker. Known seal with rubber tape sector fixed ring, elastic elements and a gas-tight shell. one ; However, this design has insufficient durability and tightness during operation. In compaction with rubberized tape, the segments of the latter are quickly worn out and under the action of high-temperature gas flow are gradually destroyed, and because of the considerable size of the furnace bodies and the tolerances for their manufacture in the structures have not reached required tightness, in the seal with the springs over time, the elasticity of the springs decreases, some of them burst. Closest to the proposed. is a rotary kiln seal containing a movable shell fixed to the furnace body with lifts mounted on its inner surface, a set of elastic elements of the sealing ring with linings for a spring-loaded cable and a fixed shell mounted on the furnace head with a ring cooled chamber 2. However, the implementation such a seal is also associated with the difficulties of achieving the specific pressure required for tightness in friction pairs, uniform along the entire length of the joint to be sealed, and with insufficient minutes reliability of operation of the pressing assembly, resulting in low durability is incomplete and its sealing operation. In addition, screw elevators are made in the form of open channels and, by the nature of the work, refer to pouring shelves rather than lifters, which makes it difficult for the spillage to return to the furnace. The purpose of the invention is to increase hermetically the furnace and ensure the reliability of the seal. This goal is achieved in that in the rotary kiln seals containing a movable shell fixed to the furnace body with lifts mounted on its inner surface, a set of elastic elements of a sealing ring with linings for a spring-loaded cable and a fixed shell mounted on the furnace head, the lifts are made in the form of a shell with windows on the side of the sealing ring and a slope in the direction of the furnace head, and the elastic elements of the sealing ring are on the inside side enney surface of the movable shell is provided with a heat-resistant durable sectors.

FIG. 1 shows the sealing device according to the invention; in fig. 2 section aa in FIG. in fig. 3, view B in FIG. 2, on the window of the dust-lifting lifter.

A movable shell 2 with lifts 3 is fastened on the furnace body 1, and there is no movement on the head, and a shell with an annular cooled chamber 4. On the movable shell 2 there is an end flange 5 to which a set of elements of the sealing ring 6 of elastic material is attached. . To each element of the ring 6 set, on the inner side of the movable shell 2, a rigid element 7 is made of heat-resistant antifriction material 4, and on the opposite side ring lining 8 is cut with a cut on the side of the furnace head 1 into which one or several turns of spring-loaded cable 9 are inserted.

Seal works as follows.

In the cooled annular chamber 4 from the bottom serves a cooling agent discharged in the upper part. Along the outer cylindrical surface of the annular cooled chamber 4 with an applied anti-friction coating, a set of elastic elements slides a ring 6 with rigid elements 7, which rotate together with the shell 2, the lifters E and the end flange 5. At the same time, the tolerances for knot production and radial runout are eliminated. account provided in the joints of the elements of the ring 6 gaps and inclination of a set of elastic elements of the ring b with rigid elements 7, which under the action of the enclosing spring-loaded cable 9, they are pressed against the anti-friction coating of the cooled chamber 4. The angle of inclination between the elements of the ring b and the rubbing surface of the cooled camera 4 should not be more than 50 When moving the housing 1 along the axis of rotation, the set of elastic elements of the ring 6 and the rigid elements 7 moves after behind the furnace 1. By selecting the force of the springs of the cable 9, the necessary radial equidistributed pressure of the spring-loaded cable 9 on the part of the ring b and the rigid element 7 is achieved, which contributes to It is the longest time and reliability of the seal. When the value of the angle of inclination between set

elastic elements of the ring b with rigid elements 7 and the rubbed surface of the cooled chamber 4 more than 50, chipped sharp edges are observed, which leads to scratches and failure of 5 anti-friction coatings. Wear

the rubbing surfaces of the set of elements of the ring 6 and the rigid elements 7 occur until the latter are strictly vertical

position.

The elevators 3 are made in the form of a shell of any section (circle, square, etc.), are fixed in the closed space of the movable shell 2, have windows on the side of ring b elements located directly beside the set of rigid elements 1, and a slope towards the cooled chamber 4 or the end of the furnace 1. The cylindrical surface of the shell 2 to improve transport back to the furnace 1, dust spillage can be made conical with a slope from the cooled chamber 4.

Using the proposed

5 devices for sealing, for example, rotating cement kilns, reduce, due to the high reliability of the seals, the maintenance and repair costs.

For the rotary kilns, and the high degree of tightness provided by the proposed device, by reducing the amount of atmospheric air into the rotary gas path, the kiln reduces the fuel consumption for firing and improves the kiln performance.

Claims (2)

1. Author's certificate of the USSR W 520499, cl. F 27 B 7/24, 1974. 2. USSR Author's Certificate No. 534629, CL. F 27 B 7/24, 1975 5 (prototype).