JPS6283413A - Gitter brick of hot stove - Google Patents

Abstract

PURPOSE:To increase the heat transfer area of gitter bricks and to improve regeneration efficiency by forming the gas passage holes of the gitter bricks in the regenerator of a hot stove for a blast furnace to inclined holes. CONSTITUTION:A single gitter brick 11 is formed with the many spiral gas holes A, B, C around a center O which are respectively communicated with the inclined holes A, B, C of the single gitter brick bodies 11 stacked in superposition thereon. The inclined holes connect successively to the upper gitter bricks. These gitter bricks 1 are stacked and assembled in many stages. Otherwise the gas holes A, B, C in the gitter bricks from the many spirals around the center S of the regenerator and therefore, the inside peripheral area in the gas holes increases and the heat transfer area increases. The regeneration capacity is thus increased without increasing the volume of the hot stove and the sensible heat of the combustion gas passing through the inside of the gitter bricks is regenerated with good thermal efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a gitter brick that is incorporated into a heat storage chamber of a hot blast furnace attached to a blast furnace.

Prior Art and Its Problems In recent years, high temperature blast furnace ventilation has been implemented in blast furnace operations in order to reduce the amount of fuel used.

As is well known, blast furnace air blowing is carried out by alternately operating 3 to 5 hot blast furnaces attached to a blast furnace, 1 to 2 at a time, and using Gitter bricks, which incorporate high-temperature combustion gas generated in a combustion chamber into a heat storage chamber. The sensible heat of the combustion residue is stored in the Gitter brick by passing through the gas hole, and then the air to be blown to the blast furnace is passed through the gas hole of the Gitter brick and is supplied to the blast furnace for heat. is greatly influenced by the structure of the Gitter brick, that is, the heat storage efficiency.

The above-mentioned Gitter bricks are generally of the fly type, and as shown in Figure 3, the structure is a single hexagonal pillar brick (1°) with a large number of gas holes (8°). Each gas hole (8') connects the center position of the inlet side opening and the outlet side opening, and the S axis (0゛) is parallel to the vertical axis (0) passing through the center of the single brick (1゛). It is provided.

For this reason, the heat transfer area of each waste hole (A゛) that comes into contact with high-temperature combustion waste is small, and there is a limit to how high the blast furnace air can be heated.
In order to blow blast furnace air at a higher temperature, the capacity of the hot blast furnace must be expanded, which requires a large amount of construction cost.

Therefore, in order to improve the heat storage efficiency of the killator bricks, various types of killator bricks with devised gas hole shapes have been proposed.

For example, a spiral recessed hole is formed on the inner circumferential surface of each gas hole (Japanese Patent Laid-Open No. 52-41306), or a stepped projection is formed on the inner circumferential surface of each gas hole (Japanese Patent Laid-Open No. 52-41306). 55-7
07709> etc.

All of the above are either designed to improve heat storage efficiency by creating a turbulent flow of combustion debris within each gas hole, or the pressure loss is large due to the shape of the debris holes being double 9!71. In addition, there were problems such as the manufacturing process being labor intensive and the cost being high.

Purpose of the Invention The present invention was made in order to solve the above-mentioned problems, and provides a hot-blast stove in which the heat transfer area is increased and the heat storage efficiency is improved by forming the gas holes of the killator bricks into inclined holes. The main ivy brick is proposed.

Structure of the Invention In the killer brick of the present invention, each gas hole of the single brick is formed into an inclined hole that is shifted from the center position of the inlet side opening and the outlet side opening or laterally from each other, thereby increasing the heat transfer area of the gas hole. It is characterized by this.

In other words, by forming the gas holes in the single brick as inclined holes, the area of the inner peripheral surface of the gas holes is increased to increase the heat transfer area, and the heat storage efficiency is improved without increasing the capacity of the hot air stove. This reduces the temperature of the waste gas from the hot blast furnace, making it possible to blow air into the blast furnace at a higher temperature.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 is a perspective view of a portion of straight stacked killer bricks with gas holes that are tilted spirally around the center of each single brick, and Figure 2 is a perspective view of a portion of the bricks that are tilted spirally around the center of the heat storage chamber. FIG. 2 is a perspective view of a portion of straight stacked killer bricks with gas holes formed therein.

In Fig. 1, each gas hole is inclined in a spiral shape with the center of the single brick as the axis, and the (n)th row of single bricks (1
)Each gas hole (A) (B) provided around the central axis (0)
(C) −−・− is the (n+1)th row of single bricks (11
) Each gas hole (A) (B) E)...
. . . and further connected to the (n+9)th single brick.

In addition, in Fig. 2, each gas hole is concentric with the center of the heat storage chamber as an axis, and is spirally inclined at a different angle for each circumference. Each gas hole (A) (B) (C)...... provided in
Connected to each scrap hole (A), (B), (C), etc. provided in the single brick (21) of the (+1+1) stage,
Furthermore, it is formed so as to be successively connected to the single brick of the (g+2)th stage.

In addition, when the center of the heat storage chamber is used as the axis, in addition to the above-mentioned straight stacking, wrap stacking can also be carried out.

Function This invention makes each gas hole of the killator brick an inclined hole to increase the heat transfer area for heat exchange, so heat exchange with combustion gas is performed efficiently and the exhaust gas temperature after heat exchange is reduced. It is possible to carry out high-temperature blast furnace ventilation.

By attaching fins to the inner surface of the dome of the hot air stove to encourage swirling of the combustion gas, combustion scum can be smoothly introduced into each gas hole, which is effective in reducing pressure loss.

EXAMPLE Next, the killator bricks of the present invention shown in FIGS. 1 and 2 and the general fly-type killator brick shown in FIG.
Blast furnace air blowing was carried out using a hot stove having the specifications shown in Table 1. Then, the exhaust gas temperature was measured and the heat storage efficiency was compared. The results are shown in Table 2.

From this table, the shape shown in FIG. 1 was able to lower the exhaust gas temperature by 35°C and improve the heat storage efficiency by 2.6% compared to the typical shape.

−〇 − In addition, the shape shown in Figure 2 has a temperature of 42°
C and improved heat storage efficiency by 3.1%.

Table 1 Table 2 Effects of the Invention As described above, this invention aims to increase the heat exchange efficiency with the combustion nozzle and increase heat storage by forming the gas holes in the killator brick as inclined holes. This makes it possible to increase the temperature of the blast furnace air and contribute to reducing the fuel ratio used in blast furnace operation.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a portion of the killator bricks according to the present invention, which are stacked straight and have gas holes spirally inclined around the center of each single brick, and Fig. 2 is a partial perspective view of the center of the same heat storage seedling. Figure M3 is a perspective view of a portion of straight stacked killator bricks with gas holes spirally inclined around the axis. 1.2, 11.21...Single brick, A, B, C...
Scrap hole, O... center of single brick, S... center of heat storage chamber. Applicant: Sumitomo Metal Industries, Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. In a Gitter brick to be incorporated into a heat storage chamber of a hot air stove, each gas hole in the single brick is formed into an inclined hole in which the center positions of the inlet side opening and the outlet side opening are shifted from each other in the horizontal direction, A gitter brick for a hot air stove characterized by an increased heat transfer area of gas holes. 2. The gitter brick for a hot air stove according to claim 1, wherein when assembled, each gas hole forms a spiral inclined hole with the center of the single brick as an axis. 3. The gitter brick for a hot-blast stove according to claim 1, wherein when assembled, each gas hole forms a spiral inclined hole with the center of the heat storage chamber as an axis.