JPS63113293A - Furnace body protective wall - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a high temperature melting furnace, such as a cupola or a high temperature melting furnace.

The present invention relates to a furnace body protection wall that protects a furnace wall of a blast furnace or the like from heat load from inside the furnace.

(Prior art) Conventionally, as a protective wall for a blast furnace shell, for example, 1.
48504 and Japanese Utility Model Application Publication No. 50-137305, refractory bricks are built on the inner side of the furnace of a stave cooler for blast furnace cooling having a brick receiving part to protect the furnace body from the heat load from inside the furnace. Also, as shown in Fig. 3, there is a cast iron stave cooler in which cast bricks 2b are buried in the inner side of the furnace in several stages above and below, and steel pipes 3 forming refrigerant passages are buried inside the shell side. Main body 1
are arranged to form a concentric wall inside the blast furnace shell 4, and furnace wall bricks 2c are arranged inside the stave cooler main body 1.
The heat load from inside the furnace is absorbed by the refrigerant inside the steel pipe 3 through the stave cooler body 1, and the steel shell is protected from the heat load. It was designed to do so. The furnace wall bricks 2c are placed approximately 450 to 600 m on a brick support shelf 6 that protrudes from the stave cooler in a shelf-like manner in order to provide strength to the brickwork structure and extend its service life.
It is stacked with a wall thickness of m.

However, this brick support shelf 6 can usually only be installed at a pitch of 1.8 to 2.5 m, and since the bricks are simply stacked inside the stave cooler, the supporting strength of the bricks is insufficient and the lifespan is short. It had the disadvantage of being short, only lasting about three years. In addition, damage to furnace wall bricks progresses due to thermal spalling under high temperatures, wear due to falling raw materials, and chemical alteration due to alkaline substances circulating in the furnace. The bricks may lose their strength and fall off at once or over a wide area, resulting in a significant change in profile.

Changes in the furnace profile over time due to the loss of furnace wall bricks and deterioration of the balance in the circumferential direction will cause phenomena such as gas venting to the peripheral side of the furnace wall and an increase in the rate of descent of the contents, resulting in an increase in heat load. increase, decrease in gas utilization rate, accelerated wear and tear of furnace wall bricks,
This will cause deterioration in charge distribution controllability, and the furnace condition will become unstable.

Furthermore, in order to solve the above-mentioned problem, a structure in which the furnace wall bricks and the stave cooler are integrated as shown in FIGS. 4 and 5 is an effective means for solving the problem, but When exposed to high temperatures, the refractory support hardware 7 softens, reducing the supporting capacity of the furnace wall bricks and causing them to fall off.

(Problems to be Solved by the Invention) The present invention aims to improve the above-mentioned problems, and has a structure in which conventional furnace wall bricks or refractory materials are integrated with a stave cooler, and the brick support hardware 7 is eliminated. .

(Means for Solving Interval Points) The present invention provides a stave cooling device for protecting the furnace shell from heat load in the furnace and a furnace protection wall having furnace wall bricks. It is characterized by a refractory material molded into a convex shape and integrally cast with the steel pipes that form the cooling passage, eliminating the need for brick support hardware, and further protecting the furnace shell from the heat load inside the furnace. In a stave cooling device and a furnace body protection wall having furnace wall bricks, refractory materials formed in a convex shape in advance are arranged at the upper and lower ends of the furnace inner wall surface of the stave body, and further, a long shape is arranged in advance between the refractory materials. A refractory material molded into a shape is placed, and a refractory material molded in advance into a short length is sandwiched between the long refractory materials, and the refractory material is integrally cast with the steel pipe forming the cooling passage, so that no brick support metal fittings are provided. In other words, by integrating the conventional furnace wall bricks and the stave cooler, the supporting capacity of the structure shown in Figures 4 and 5 and the four-bar bricks is strengthened, and the The brick wall thickness can be made thinner, the profile changes less due to brick damage, and it is possible to maintain constant operation over a long period of time.In addition, by eliminating the bricklaying work, the construction period can be significantly reduced. Can be shortened.

Further, by eliminating the brick support metal fittings 7, there is no problem that the brick support metal fittings 7 become soft due to exposure to high temperatures and the supporting capacity of the bricks decreases, and a strong support structure can be maintained for a long period of time.

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

In Figures 1 and 2, 1 is a stave cooler main body, and a steel pipe 3 for forming a refrigerant passage and a groove 8 are formed on the furnace side of the stave cooler main body 1 on the side of the steel skin 4 of the stave cooler main body 1. The groove portion 8 is provided with a refractory material 2a that is pre-shaped into a convex shape or a refractory material 2a (3), 2a (B) that is pre-molded into a long shape and a short shape, and these refractory materials 2 a * 2 a(4), 2
aω) is cast together with the steel pipe 3. The stave cooler thus cast is placed inside the steel shell 4 concentrically with the blast furnace, and the stave cooler main body 1
The steel pipe 3 is connected to a cooling pipe outside the furnace body (not shown), and a filler material 5 is filled in the space between the stave coolers and between the stave cooler and the steel shell.

(Effects of the Invention) According to the furnace protection wall according to the present invention, a) the brick support hardware is eliminated and the conventional furnace wall bricks or refractory material are integrated with the stave cooler, so the brick support hardware is softened and the supporting capacity is reduced. A stable support structure can be maintained over a long period of time without deterioration, and even if cracks occur in the furnace wall bricks due to thermal spalling, etc., the furnace wall bricks will not fall off over a wide area. , a stable profile can be maintained over a long period of time.

b) By strengthening the brick support structure as described above, it is possible to reduce the thickness of the furnace wall bricks, and even if the brick loss becomes uneven, the amount of change in the profile will be small. , less deterioration of circumferential balance.

C) Since the stave and furnace wall bricks can be mounted as an integral block, the construction period is shortened due to the reduction in bricklaying work inside the furnace, and equipment costs are reduced.

d) 0 that exhibits effects such as being able to arbitrarily change the thickness of the furnace wall bricks in the direction of the furnace height.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams showing the furnace protection wall of the present invention, and FIGS. 3, 4, and 5 are diagrams showing the conventional furnace protection wall. 1... Stave cooler body 2a... Refractory material 2b... Cast brick 2c.
...Furnace body brick 3...Steel pipe 4...Furnace body shell
5... Filler material 6... Brick support shelf 7...
Brick support hardware 8... Applicant: Mizobe, patent attorney representing Nippon Steel Corporation, Kiyoshi Kosara -・+,, -(g◇3rd
0 Figure 4 Figure 5

Claims (2)

[Claims] (1) In a furnace body protection wall having a stave cooling device and furnace wall bricks that protect the furnace shell from heat load in the furnace, a refractory material pre-formed into a convex shape is arranged on the furnace inner side wall surface of the stave body, A furnace body protection wall characterized by being integrally cast together with a steel pipe forming a cooling passage, so that no brick support hardware is provided. (2) In a stave cooling device that protects the furnace shell from heat load in the furnace and a furnace protection wall having furnace wall bricks, refractory material is formed in advance into a convex shape at the upper and lower ends of the furnace inner wall surface of the stave body. A refractory material previously formed into a long shape is placed between the refractory materials, and a refractory material previously formed into a short shape is sandwiched between the long refractory materials, together with a steel pipe forming a cooling passage. A furnace protection wall characterized in that it is integrally cast and has no brick supporting metal fittings.