CS265773B1 - Shutter flap - Google Patents

Abstract

Shut-off flap for separating the flue gas space of a steam boiler from a Ljungstrom air heater with blades built in outside the influence of abrasive effects. The blades are welded to shafts, which are mounted in rolling bearings, located on the outside of the frame. The blades are controlled by a servo drive, a lever mechanism. It can be used in all types of boilers where LjungstrSm air heaters are considered in the project.

Description

The invention relates to a shut-off flap located in the flue gas duct of a steam boiler and to a close closure of the flue gas duct between a second draft of the boiler and an air heater of the Ljungstrom type.

The existing shut-off flap valves installed in the flue gas ducts upstream and downstream of the Ljungstrom air heater do not, by their design, ensure the tightness of the combustion duct. According to their design, the closing blades, the leaf frames and the internal slide bearings are permanently in the flue gas flow. 2 of this reason, after two to three months of operation of the boiler, the inner bearings of the flap valves are sealed and at the same time, the closing leaves and the leaf frames wear strongly, causing permanent damper leakage and immobility. These dampers therefore do not allow boiler operation or reduced output in the event of failure or shutdown of one Ljungstrom air heater, since shutting down the dampers cannot protect the shut-off Ljungstrom air heater from thermal stress and it is not possible to carry out any maintenance work.

The aforementioned drawbacks are overcome by a shut-off flap according to the invention, which consists of a frame in which two parallel shafts are fitted with two arms, both shafts being housed in roller bearings located on the outside of the frame and actuated by a servo-actuated lever. position sealed by means of a gasket mounted on the beam in the clips.

The advantages of the invention are that it allows the operation of boilers with only one Ljungstrom, allows repairs to operational and other failures in the emergency shutdown Ljungstrome, to perform inspection, maintenance, basket washing and intermediate repairs at Ljungstrome during its planned shutdown during boiler operation.

In the accompanying drawings of FIG. 1 is a top view of the Ljungstrom air heater shutter; FIG. 2 shows a detail of the seal of the damper arm at the shaft in the working position, FIG. 3 detail of beam with protector and sealing sheets. In FIG. 4 is a schematic representation of the operation of the shutter flap by a lever mechanism

The shutter flap comprises a flap frame 7 in which the flap arms 2 are welded to the shafts 2, which are mounted in rolling bearings located outside the frame. The actuation of the damper arms is actuated by a lever mechanism thereof. The hermeticity of the flap arms in the closed-working position is solved by means of a seal 2 housed in the clips j>. The retainer 5 with the retainer serves to fasten and protect the sealing elements against abrasion. The tubular perforated ring 4 provides for the displacement of the deaf spaces from possible deposits by means of compressed air.

Claims (1)

OBJECTS OUTLET A shutter for separating the flue gas space of the steam boiler from the pre-heater type Ljungstrom, characterized in that it consists of a frame (1) in which two arms (2) are attached to two parallel shafts (3), the two shafts being stored in the roller bearings located on the outside of the frame (1) and actuated by the servo-drive (9) by means of the lever mechanism (8) and the arm (2) are sealed by means of a gasket (7) mounted on the beam (5) in the clips (6) . 4 drawings 265,773 265 773 FIG. 4 DESCRIPTION OF THE COURSE CERTIFICATE OF THE CZECHOSLOVAK SOCIALIST REPUBLIC (19) (22) Registered 06 04 87 (21) PV 2442-87.Z 265 774 (11) (Bl) Ϊ13, (51) Int Cl.4 E 21 D 23/00 FEDERAL OFFICE FOR INVENTIONS (40) Published 14 03 89 (45) Issued 15 12 89 (75) Author of the invention WALA TADEÁŠ ing., PRIEVIDZA (54) Equipment for coal or utility mineral flow (57) The equipment for directing the flow of coal or utility mineral is intended to direct coal to the face conveyor at its discharge through the hole in the shield of the mechanized reinforcement. The discharge chute located below the discharge opening has a swinging chute that can be used as a work platform for operating the drill while drilling into the coil ceiling. The side panels fill the gaps between the reinforcement shield with the discharge chute. The entire device is slanted into the cavity of the reinforcement shield shield. CS 265 774 B1 FIG. 265774 2 The invention provides a device for directing a flow of coarse coal or utility mineral from a discharge opening of a mechanized coarse reinforcement. Coarse coal seams or utility mineral layers are extracted in a complex mechanized manner with the aid of mechanized coarse reinforcements. Mechanized reinforcements designed to be mined with a coal ceiling or utility mineral are provided with a discharge opening in the cave, through which discharged coal or mineral is discharged to the face conveyor. The discharge opening is usually closed by a sliding, hydraulically operated closure. After the closure is opened, the discharged coal flows along the inclined chute to the face conveyor. The trough is generally hinged and operated hydraulically. The spatial arrangement of the individual elements of the mechanical reinforcement and the conveyor necessitate the use of a relatively long trough that spans the entire distance between the discharge opening and the face conveyor. The long, unbroken chute cannot be fully folded to the reinforcement without reducing the width of the transition between the reinforcement and the conveyor. The sidewalls of these gutters are relatively low and the coal flows through the sidewalls while discharging and contaminates the reinforcement section of the reinforcement section and deteriorates with the rise of the face bow. Increasing the side walls of the discharge chute prevents the spatial conditions in the reinforcement section. A further disadvantage of the long, non-dividing discharge chutes is the lack of space for operating the drills when drilling in the ceiling, in particular through the discharge opening in the reinforcement shield. The inclined trough surface prevents safe work with the drill and the additional troughs attached to the trough increase the effort and physical effort of the operator. The aforementioned drawbacks are eliminated by the coal or utility mineralization device of the invention, the principle of which is a discharge chute pivoted below the discharge opening and hinged into the cavity of the opening in the reinforcement shield controlled by a hydraulic or mechanical device. The trough is equipped with a swinging slide whose swing is controlled by a hydraulic or mechanical device. On the sides of the discharge opening in the reinforcement shield, there are pivotable cover plates carried by the pivot chute when the trough is being folded into the discharge cavity. The movement of the movable trough tip is coupled with the movement of the discharge trough by a hydraulic or mechanical device. By arranging the swiveling slope of the discharge chute, the trough length can be shortened, which can thus be folded into the discharge opening cavity in the reinforcement shield, whose length is generally less than the tray length. After folding the trough, the entire width of the transition between the conveyor and the operator movement reinforcement is released. Another advantage is the use of a swiveling slope as a working platform for operating the drills when drilling into the ceiling, and by changing the position of the discharge chute, any working platform height above the face can be selected. Using the slip as a work platform increases operator safety and hygiene. Lateral cover plates hung on the side walls of the discharge opening in the reinforcement shield are deflected around a pivot point located at the upper edge of the sheets automatically when the tray is tilted from the hole cavity and prevent the overflow of coal or mineral through the side walls of the tray. Side cover plates improve the work hygiene of the operator. In the accompanying drawings, a device is shown in front, wherein in FIG. 1 the device is in the working position during the discharge of coal or mineral from the discharge opening in the reinforcement shield. Fig. 2 shows the device after folding into the discharge opening cavity in the reinforcement shield. Fig. 3 shows the device in the lower position when the swinging slide acts as a working platform for the operation of the milling drills. Fig. 4 shows a device with a pivot slip held in a working position by a pulling device operating on a stop on a cave shield. The device according to the invention consists of a hopper 1 suspended pivotably about an axis 0 at the lower edge of the discharge opening V0 of the cantilever shield 14 of the mechanized reinforcement. At the end