JPS6159362B2 - - Google Patents

Description

Claim 1: A shaft furnace wall cooling device comprising a longitudinal cooling member arranged along a shaft furnace wall and a cooled support protrusion, wherein the cooled support protrusion includes a tube 2 having a sleeve 5. The tube 2 extends between the longitudinal cooling members formed in the form of tubes 1, the sleeve 5 is fixed to the tube 1, and the tube 2 extends between the longitudinal cooling members. A shaft furnace wall cooling device characterized in that the cooling member is arranged at an angle equal to or smaller than 90 degrees with respect to the tube 1.

2. A shaft furnace wall cooling device comprising a longitudinal cooling member arranged around a shaft furnace wall and a cooled support protrusion, wherein the cooled support protrusion is attached to the sleeve 5 and the outside of the furnace wall. and a heat exchanger 10 formed in the form of a heat pipe 2, the heat pipe 2 extending between the longitudinal cooling members made in the form of tubes 1, and the tube 1 having the sleeve attached thereto. 5 is fixed, and the heat pipes 2 are arranged at an angle equal to or smaller than 90 degrees with respect to the tubes 1 of the longitudinal cooling member.

FIELD OF THE INVENTION The present invention relates to a device for cooling the walls of a shaft furnace.

Background technology Vertical cooling plate and supporting projections
A shaft furnace wall cooling device is known which includes a horizontal cooling plate made in the form of a projection. The horizontal plate is placed between two adjacent vertical plates (SMAndoniev, OVFilipiev,
Author CAKudinov: Cooling of blast furnaces, Metallurgia
Publishers, Moscow, 1969, pp. 232, 103
(see figure).

A large cutout is made in the furnace shell that serves as a port hole, through which a horizontal plate into which cooling pipes are cast is inserted into the furnace, and the cutout reduces the strength of the furnace shell. . Additionally, since the cooling tubes are cast into the plate, the metal particles tend to grow in size and undergo partial carbonization.

Blast furnace coolers are known in which the supporting projections are cast integrally with the vertical plate, in which case the tubes for cooling the supporting projections are provided in an independent cooling supply system (page 218 of the above-mentioned book). (see Figure 97a) or integrally equipped with a plate cooling pipe (see Figure 97b, page 218 of the above book). Since the support projection is made integral with the plate and its bulky part surrounds the lower part of the casting structure, it cools at a very slow rate. Therefore, the metal solidification rate is slowest at the support protrusion, and cavities and shrinkage tend to occur in the metal at that portion. Also, the support projections have the lowest quality metal. Due to their orientation towards the working space of the furnace, the supporting projections are subjected to a high degree of wear caused by the action of the charge and the action of the gas flow. This is the main cause of the short lifespan of the supporting projections in question. Failure of the cast iron of the support projections leads to failure of the cast iron of the vertical plate, which leaves the furnace shell unprotected from the effects of the furnace atmosphere. As a result, the furnace shell becomes overheated and deformed.

Blast furnace wall cooling devices known to those skilled in the art also include cooling tubes arranged along the entire vertical length of the blast furnace shaft and welded to each other by reinforcing ribs (in particular Kosho 45-14642,
(see cl.10A521). The cooling pipes are connected to supply ring mains and discharge ring mains located at the lower and upper parts of the blast furnace chest. The absence of members to support the refractory lining invariably leads to premature failure of the entire lining even if slight damage occurs to any part of the furnace chest.

The device for protecting the shaft furnace shell described in Japanese Patent Publication No. 49-6443 is the shaft furnace cooling device of the present invention.
Technically closest to the cooling device. The device comprises vertical cooling members or plates spaced apart from each other along the vertical extent of the reactor chest. In the spaces between these vertical plates, seat angles for supporting the refractory lining and cooled support projections made of materials that cool these seat angles are arranged, which extend beyond the vertical surface into the furnace. It is growing to.

The cooling member is made in the form of a hollow steel case and extends into the furnace, with a seat angle resting on the cooling member. The cooling member and seat angle are fixed to the furnace shell. The strength of the furnace shell is
It is significantly reduced by the cutouts or port holes through which the cooling elements and seat angles are introduced into the furnace.

Due to the large volume and surface area of the cooling element,
The entire upper surface of the cooling member and seat angle becomes superheated resulting in vapor formation and rapid burnout of the cooling member. Furthermore, it is not practical to provide sufficient velocity of coolant flow within such cooling elements (water cooling or evaporative cooling), which shortens the service life.

The durability of the above-mentioned cooled support protrusions is insufficient, leading to worse cooling of large parts of the furnace shell, resulting in deformation and burn-out of the furnace shell.

SUMMARY OF THE INVENTION What is needed is an apparatus for cooling the walls of a shaft furnace that improves the durability of the refractory lining of the furnace chest and shell and thus allows for longer overhaul cycles of the shaft furnace. It is to do so.

The present invention provides a shaft furnace wall cooling device comprising a longitudinal cooling member arranged along a furnace wall and a cooled support projection, in which the cooled support projection is made in the form of a tube with a sleeve. and these tubes extend between longitudinal cooling members made in the form of tubes to which said sleeves are fixed, the tubes of the cooled support projections being at an angle of 90 degrees to the tubes of the longitudinal cooling member. Provided is a cooling device arranged at an angle equal to or less than .

The cooled support protrusion is connected to a heat pipe (heat pipe) with a heat exchanger mounted on the outside of the furnace wall.
preferably in the form of pipes).

Since the cooled support projections are made as tubes, the internal cross-sectional area of the tubes is reduced, while the speed of movement of the coolant is increased, and these result in improved and reliable cooling of the support shoulders as well as It means high durability.

The high durability of the support projections ensures a long service life of the refractory lining and provides reliable protection of the longitudinal cooling member and the furnace shell from the harmful effects of the furnace atmosphere.

Since the tube of the support projection is not cast during its manufacture, the physico-mechanical properties of the tube metal remain intact.

The small surface area of the protrusions makes it possible to reduce the removal of heat from the reducing gas furnace, which reduces the fuel consumption required for the technological process.
Failure of the supporting projections does not result in any damage to the longitudinal cooling elements, which ensures higher reliability of use of the furnace shell.

The cooling device of the present invention is simple to manufacture and assemble.

DESCRIPTION OF THE DRAWINGS The invention will be explained by way of example embodiments in conjunction with the accompanying drawings. FIG. 1 is a front view of a device for cooling a shaft furnace wall according to the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. FIG. 4 is a front view of an embodiment of the present invention for cooling a shaft furnace wall, and FIG. 5 is a sectional view taken along the line of FIG.
Fig. 6 is a cross-sectional view taken along the line of Fig. 4.
FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, and in particular to FIG. Contains.

The pipe 1 is connected to a coolant supply pipeline 3 (FIG. 2) and a coolant discharge pipeline 4.

A sleeve 5 is fixed to the tube 1, through which a support projection made of the tube 2 extends.

A refractory lining 6 is placed or arranged on top of the tube 2 .

The cooler as a whole is fixed above the furnace shell 7〓〓〓
ing.

The pipe 2 (FIG. 3) is connected to a coolant supply pipeline 8 and a coolant discharge pipeline 9.

In the embodiments shown in FIGS. 1, 2 and 3, the longitudinal cooling members are mounted vertically and the cooled support projections are placed horizontally, i.e. at an angle of 90 degrees to the longitudinal cooling members. It is mounted at an angle.

The cooled support projection of the tube 2 shown in FIGS. 1, 2 and 3 has a flow cooling system.

In the embodiments shown in FIGS. 4, 5 and 6, the cooled support projections made of tubes 2 are in the form of heat removal tubes (heat pipes).

In the chest of a blast furnace, the furnace walls are usually arranged at an angle of 82 to 84 degrees with respect to the horizontal. tube 1
The longitudinal cooling members (FIG. 5) are arranged or arranged along the furnace wall. The tubes 2 constituting the cooled support member are mounted horizontally. Therefore, the angle between the longitudinal cooling member and the cooled support projection is less than 90 degrees.

Alternatively, the cooled support protrusions may be arranged or arranged at an oblique angle towards the descending charge relative to the longitudinal cooling member. Preferably, the refractory lining is deposited onto the furnace wall by flame application.

Cooling of the supporting projections, which are made in the form of heat pipes, takes place by means of a heat exchanger 10 arranged outside the furnace wall. A coolant inlet pipe 11 and a coolant outlet pipe 12 are connected to the heat exchanger 10 .

The shaft furnace cooling system works as follows.

A coolant, such as water or a steam-water mixture, is admitted into the tube 1 through the supply pipeline 3 (FIGS. 2 and 5), extracts heat from the charge and the furnace gases in the tube, and then the pipeline It is discharged through 4.

In addition, coolant is supplied to supply pipeline 8 (third
(Fig.) to the tube 2, where it extracts heat from the charge and the furnace gases and is discharged through the pipeline 9.

The tube 2 constituting the support projection extends into the furnace interior through a sleeve 5 fixed to the tube 1 of the longitudinal cooling member and has a refractory lining 6 placed over the tube 2 .

The cooling system as a whole is fixedly attached to the furnace shell 7 (FIG. 2) by conventional means.

Because the support projection is made in the form of a heat removal tube, the fluid circulating in this heat removal tube is cooled in the heat exchanger 10 (FIGS. 4, 5, 6).
figure). Cooling is provided by coolant supplied through inlet pipe 11 and discharged through outlet pipe 12.

The device according to the invention can be easily applied for cooling the furnace wall in order to protect the blast furnace shell from the harmful effects of the furnace atmosphere.

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