SU933709A1 - Feeder for feeding coal dust to blast furnace - Google Patents

Description

one

The invention relates to ferrous metallurgy and can be used in the injection of pulverized coal into the horn of a blast furnace.

Known designs for supplying pulverized coal to the blast furnace, made in the form of a rotor with cells, placed in a hermetic case and equipped with an electric actuator 1.

However, such feeders are bulky, consume a large amount of energy, reliability and low.

Aeration feeders are known that contain an incineration chamber, an outlet pipe with a tapered rod and a stop rod, which make it possible to simplify the dosing process, 2.

However, the conical shape of the inlet end of the outlet, the pipe and stem, due to the steep regulation characteristic, does not allow for accurate metering, the feeder locking surfaces are exposed to coal dust and wear out quickly.

A known design of a feeder comprising an aeration chamber with an air distribution grill, a transport pipe with a side loading window and a locking and regulating element with a hollow stem moving progressively along the loading window. This feeder is simple

10 and provides a fairly accurate dispensing of the SPZ. The disadvantage of this feeder is that the barrier surfaces are exposed to coal dust and wear out quickly. In addition, the supply air duct of such a feeder must be movable, which makes maintenance difficult.

20

Claims (1)

The purpose of the invention is to increase the service life of the feeder by preventing wear of the closure surfaces and improving its maintenance conditions. 39 The goal is achieved by the fact that in a feeder for supplying coal dust to a blast furnace, containing an aeration chamber with an air distribution grill, a transport pipe with a side loading window and a locking control element with a hollow rod, the locking control element is designed as a bushing rotatable. the length of the length of the loading window, equipped with calibrated holes in the Ookova wall and connected to a hollow rod with side holes for supplying air, the end of which is taken out of the transport cavity uyuschey pipe. With this design, the carbon dust does not come into contact with the locking surfaces, 1 due to which their wear is prevented. The pipeline for supplying air is fixed, and the metering accuracy is ensured by supplying the required calibrated orifice of the sleeve to the loading window. All this improves the conditions of its service. At the same time, it is still possible to smoothly control the consumption of powdered material by partially blocking the loading window. . . FIG. 1 shows the feeder, a general view; in fig. 2 — node 1 in FIG. one; in fig. 3 shows section A-A in FIG. 1, The feeder consists of an aeration chamber 1 with an air distribution grill 2, a manifold 3 and a nozzle C for supplying aeration air. A transport tube 5 with a side loading window 6 is inserted inside the aeration chamber. A sleeve 7 is located inside the transport tube, which has the possibility of rotation and is connected to the hollow rod 8, which is brought out of the tube cavity through the gland 9. The end of the hollow rod 8 is muffled and fitted 10, by means of which the stem 8 and the bushings 7 are rotated. There are holes in the side walls of the stem 8 to allow air to pass inwardly into the bushings 7. The sleeve 7 also has several calibrated holes 5, the combination of each of which with a side opening in the transporting pipe provides pbdach material with a given flow rate. 9 The device works as follows. Before starting work through the pipe k, they start supplying the aeration air to the batcher (with the flow rate from the transporting air flow rate), after which; include the flow in the transport pipe 5 of the main carrier air. Combining one of the openings of the sleeve 7 with the side window 6 in the transporting pipe 5 begins to dispense material from the hopper. Carbon dust first comes inside. sleeve, and then goes into the transport pipeline, i.e. during normal operation of the device, dust is completely out of contact with the locking surface between the sleeve and the pipe. With a length of less than 3 lengths of the side window in the pipe, it is possible for dust to leak between the contact surfaces even with a small gap between them. Increasing the length of more than 10 lengths of the side window in the Pipe is impractical, since this sharply increases the resistance to rotation of the sleeve and possibly its jamming. The presence of several calibrated holes allows the feeder to work stably in several modes. Accurately setting the feeder to a specific mode is out of position with a latch mounted on the handle. This does not preclude the smooth adjustment of the dust supply due to the partial overlapping of the holes. The angle between the nearest adjacent calibrated holes is chosen to be equal. where n is the number from the version. One of the fixed positions of the sleeve corresponds to the Closed mode. The use of feeders of this design in industry makes it possible to increase their service life in comparison with the known ones by a factor of 2.5-3, and also significantly improve the equitability of dust. Formula of the Invention A feeder for supplying coal dust to a blast furnace, containing an aeration chamber with an air distribution grill, transporting a pipe with a side loading window and a locking-regulating element inserted into it with a hollow stem,