JPH0120636Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a horizontal Matsufuru furnace that indirectly heats objects to be heated.

[Prior Art and Problems] As is well known, in a horizontal Matsufuru furnace, a long cylindrical Matsufuru is arranged inside an adiabatic furnace body, a material to be heated is conveyed through the Matsufuru, and a burner or an electric heater is installed outside the Matsufuru. The material to be heated is heated indirectly by the Matsufuru furnace. Conventionally, the Matsufuru placed in this horizontal Matsufuru furnace is made of heat-resistant steel.
A centrifugally cast product as shown in FIG. 4 or a molded product made of corrugated rolled material as shown in FIG. 5 is used. By the way, according to the conventional Matsuful made of heat-resistant steel,
Since the Matsufuru itself was directly heated by the high-temperature atmospheric gas in the furnace, it caused a creep phenomenon, and could not withstand its own weight and gradually deformed, making it unable to withstand long-term use. By the way, the centrifugal casting Matsufuru shown in Figure 4 was said to have a service life of 1 to 1.5 years, and the corrugated Matsufuru shown in Figure 5 was said to have a service life of 2 to 2.5 years. On the other hand, it is possible to use a material with better heat resistance and high-temperature creep properties instead of conventional heat-resistant steel for Matsufuru, but for example, Matsufuru made of carbon or ceramics would be extremely expensive.
Furthermore, since the gas produced by combustion in the burner in the furnace is oxidizing, these materials suffer from thinning due to oxidation, making them unable to withstand long-term use.

[Means for Solving the Problems] The horizontal Matsufuru furnace of the present invention has a short cylindrical carbon or ceramic sleeve in contact with the inner peripheral surface of the Matsufuru in the longitudinal direction of the Matsufuru within the Matsufuru made of heat-resistant steel. It is characterized by being arranged at appropriate intervals, thereby preventing creep deformation of the matsufuru and achieving permanent use.

[Example] FIGS. 1 and 2 show an example of a horizontal Matsufuru furnace according to the present invention. In the figure, 1 is an adiabatic furnace body, 2
denotes a long cylindrical Matsufuru made of heat-resistant steel supported by a support 3 in the furnace body 1; 4 is an inlet thereof; 5 is an outlet thereof; 6 is a band-shaped object to be heated that is conveyed in the Matsufuru 2; 7 is a burner provided in the furnace body 1. Thus, an appropriate number of sleeves 8 made of carbon or ceramics are arranged in the muffle 2 at appropriate intervals in the longitudinal direction of the muffle 2 so as to be in contact with the inner circumferential surface of the muffle 2. Reference numeral 9 denotes a stop pin protruding from the inner circumferential surface of the matsufuru 2 in order to prevent the sleeves 8, 8, . . . from shifting laterally.

However, in the horizontal Matsufuru furnace configured in this way, the Matsufuru 2 is heated by high-temperature atmospheric gas ejected from the burner 7 in order to indirectly heat the object 6 to be heated.
Although the pine full 2 is heated to a high temperature, creep deformation due to its own weight is prevented because the inside of the pine full 2 is reinforced with a sleeve 8 made of carbon or ceramics and excellent in heat resistance and high-temperature creep properties. Further, since the sleeve 8 is located inside the pine full 2, it is not exposed to oxidizing gas due to burner combustion, and therefore there is no fear that the sleeve 8 will be oxidized and thinned. Therefore, the Matsufuru 2 maintains a constant shape for a long period of time. By the way, when applied to the conventional centrifugally cast Matsufuru shown in Figure 4, the service life is extended to 3 to 6 years, approximately 3 to 4 times, and when applied to the corrugated Matsufuru shown in Figure 5. It is expected that the period will be approximately doubled to four to five years.

Note that FIG. 3 shows a sleeve 8' formed by arranging carbon or ceramic blocks 10 in a ring shape and disposed inside the muffle 2. It may be hot.

[Effects of the invention] Matsufuru made of heat-resistant steel is internally reinforced with a sleeve made of carbon or ceramics, so Matsufuru itself does not undergo creep deformation even when heated by atmospheric gas in the furnace, and the sleeve Since it is located inside the matsufuru, there is no need to worry about oxidation and thinning of the sleeve, allowing for long-term stable use. Furthermore, since the sleeves are arranged at appropriate intervals in the matsuru, the material cost is low and the practical value is extremely high.

[Brief explanation of drawings]

The drawings are related to the present invention, and FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line X-X of FIG. The figure and FIG. 5 show a conventional example. 1...Insulated furnace body, 2...Matsuful, 6...Heat object, 7...Burner, 8, 8'...Sleeve.

Claims (1)

[Scope of utility model registration request] A horizontal Matsufuru, in which a long cylindrical Matsufuru made of heat-resistant steel is placed inside an insulated furnace, the object to be heated is conveyed through the Matsufuru, and the object to be heated is indirectly heated by a burner or electric heater provided outside the Matsufuru. 1. A horizontal matsufuru furnace, characterized in that short cylindrical sleeves made of carbon or ceramics are placed in the matsufuru at appropriate intervals in the longitudinal direction of the matsufuru, and are in contact with the inner peripheral surface of the matsufuru.