SU78262A1 - Letki uncooled hearth furnace with liquid slag removal - Google Patents

Description

Furnaces With liquid slag removal, in which the tap hole, located on the sides of the hearth or in the center along its axis, is made of special cast metal plates assembled from separate parts and cooled with water, are known.

The disadvantages of such hearths are: design complexity, high cost of manufacture, and the threat of a serious accident of the firebox in the event of a cooling system failure.

In the present invention, the uncooled bottom furnace hearth of a liquid slag boiler consists of a metal panel supported by a slab having a hole with a larger cross-sectional area than the panel hole. The panel is equipped with an additional cooling coil. The coil is made in the form of a thick-walled metal pipe, part of the outer surface of which is provided with protrusions arranged in a shahmatny order.

The difference and advantages of the proposed design of the notch before the known ones consist in the simplicity of the device, reliability and convenience of exploitation.

FIG. 1 shows a notch in a section, according to the invention; in fig. 2-cast iron gage panel; in fig. 3 and 4 stud coil; in fig. 5 and 6 of the power supply circuit coil in two versions.

The letka (fig. 1) consists of a cast-iron panel /, a thorn coil 2 and a coil 3. The supporting wall 4 of the tap is made of chamotte slabs.

The construction of the taphole has great strength and makes it possible to remove the exit edges of the taphole from the side walls of the shaft. As a result, the possibility of sticking of lumps of slag to the top of the shaft is eliminated. At low loads or a jet of liquid slag hits the lower portions of the walls of the shaft. The latter circumstance allows the lining of the shaft 5 and thus to prevent it from warping, causing air swamps.

In the upper part of the tap hole, it is covered with chamotte lash 6, protecting the cast iron panel from direct impact of the torch. In the lower part, the shaft is connected to the pick-up device 7.

When the boiler is operating under, it is protected from the destructive effect

cell slag bath, which is a layer of liquid slag on the hearth of the furnace. The slag bath is created by raising the notch level above the hearth. When the boiler stops, the slag freezes, forming a permanent natural protective layer.

The tap bar (Fig. 2) consists of separate straight and angular cast-iron ribbed plates 8 and 9, tightly adjacent to each other and connected by bolts 10. At the top of the plate there is a groove 11, in which a thorn coil fits tightly. In the two opposite corners of the plates, there are holes (2) for the passage of the feed and drain pipelines of the tenon coil.

During the operation of the boiler, the leading edge of the gage plate is cooled with a tenon coil 2, and along the rest of the area with a coil 3, laid on the fins 13 along the entire perimeter of the panel. Both coils are removable.

The thorn serpentine 2 is made of a steel pipe 14 (Fig. 4), poured into a cast iron shell 15 with spikes 16 located in the direction of the sneaker along the entire perimeter in the shaft in order. The cast iron shell 15 increases the mechanical strength of the coil and prevents its direct impact from the plume. This puts the operation of the coil in more favorable temperature conditions and: increases the reliability of its operation.

Spikes 16 contribute to the formation between them on the surface of the shell a thin layer of solidified slag, which also increases the reliability of the coil.

The supply and discharge of water to the coil to cool it is carried out through pipelines 17 and 18.

To increase the reliability of water supply, the coil is divided by internal partitions 19 into two independent halves. The coil 3 is made of steel pipes with water supply from a common line.

Water can be fed to the coil according to the diagrams shown in FIG. 5 or 6.

According to the scheme shown in FIG. 5, the coil is divided into two halves with an independent supply of water 20 and a drain 21.

According to the scheme of FIG. 6 coil 3 consists of two belt coils.

Subject invention

Claims (2)

1.Leasurement of the uncooled hearth of the furnace with liquid slag removal, using a precast metal panel, protected from above by the action of hot slags with a lining and a cooling coil and resting on chamotte hearth plates, having an opening of a larger section than the section of the tap hole itself, differing in that the coil is removable and is placed in a groove bordering the entrance edge of the notch along its periphery. 2. The form of making the tap hole according to claim 1, characterized in that, in order to increase its mechanical strength and reliability of operation, the coil is made in the form of a thick-walled metal pipe, in which part of the outer surface, facing towards the furnace, is provided with spikes for the formation between them of a protective film of solidified slag. No. 7826S: 12 / 2 „№ 78262 and and .iiJ