JPH0914638A - Fire resisting device - Google Patents

Abstract

PURPOSE: To prevent the occurrence of breakage of an anchor stud due to pushing out of fire resisting members laminated inside the structural member of a furnace to the inside of the furnace when the fire resisting members are at a high temperature. CONSTITUTION: In a fire resisting device having fire resisting members 2 and 3 laminated at the inside of a structural member 1 to form the outer wall of a furnace and supported by anchor studs 4, an uneven surface part 6 performs operation being against a force to push out the fire resisting members 2 and 3, produced when the inside of the furnace is at a high temperature, to the internal side of the furnace as a result of the uneven surface part 6 being formed on a contact surface on which the fire resisting members 2 and 3 in a layer make contact with each other. Thereby, a tensile load exerted on the anchor stud 4 is reduced and breakage of the anchor stud due to high temperature creep is prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof device applied to a cyclone section of a fluidized bed boiler.

[0002]

2. Description of the Related Art A fluidized bed boiler will be described with reference to FIG. In FIG. 2, the gas is burned in the boiler 9,
The water flowing through the tube 7 is turned into high-temperature steam, but the high-temperature combustion gas is guided to the cyclone section 8, where it is denitrated and desulfurized, and is circulated to the boiler 9 again as high-temperature gas. The combustion efficiency of the boiler 9 is improved.

In the conventional fluidized bed boiler, since hot combustion gas flows through the inlet portion 8a of the cyclone portion 8, the wall of the cyclone portion 8 has a heat insulating structure as shown in FIG.

That is, the structural member 1 to be insulated is provided with two layers of fireproof members 02 and 03 inside, and the fireproof members 02 and 03 are provided.
Were fixed to the structural member 1 by anchor studs 4. The refractory member 02 on the structural member 1 side is a refractory member that emphasizes heat insulation, and the refractory member 03 on the high temperature atmosphere side 5 is a refractory member that emphasizes corrosion resistance.

[0005]

In the cyclone section of the conventional fluidized bed boiler, the temperature becomes high during the operation of the boiler, so that the structural member 1 and the refractory member 0 as shown in FIG.
Due to the temperature difference of 2,03 and the thermal expansion difference, the high temperature side 5
The refractory member 03 of No. 3 causes the protrusion 10 toward the high temperature atmosphere side 5, and as a result, the tensile load 14 is applied to the anchor stud 4, and the anchor stud 4 is broken due to high temperature creep.
There was a problem of doing 3. The present invention seeks to solve the above problems.

[0006]

According to the present invention, there is provided a refractory member having two or more layers formed inside a structural member forming an outer wall of a furnace having a high temperature inside, and a refractory member connected to the structural member. A refractory device including anchor studs for supporting the refractory member, comprising a plurality of concave and convex portions formed on respective contact surfaces of the refractory member that are in contact with each other and fitted with the adjacent refractory members. It has a feature.

[0007]

In the above, when the temperature inside the furnace becomes high and a difference in temperature and a difference in thermal expansion occur between the structural member and each refractory member, compressive stress acts on the refractory member in the direction along the layer, and Is applied, and a force that pushes the refractory member toward the inside of the furnace acts.

In the present invention, since a plurality of concave and convex portions are formed on the contact surfaces of the refractory members which are in contact with each other and are fitted together, the concave and convex portions act against the force of pushing out the refractory member. In addition, the tensile load acting on the anchor stud can be reduced, and the anchor stud can be prevented from breaking due to high temperature creep.

[0009]

FIG. 1 shows a fireproof device for a fluidized bed boiler according to an embodiment of the present invention. In this embodiment shown in FIG. 1, the fire-resistant member 2 arranged on the surface of the structural member 1 to be thermally insulated on the high temperature atmosphere side 5 and the fire-resistant member 3 further laminated on the surface of the fire-resistant member 2,
And a refractory device for a fluidized bed boiler having an anchor stud 4 which penetrates the refractory members 2 and 3 and has one end thereof coupled to the structural member 1 to support the refractory members 2 and 3, and the refractory member 2 and the refractory member. The contact surface of the member 3 is provided with a plurality of concavo-convex portions 6 that are fitted to each other.

In the above, during the operation of the boiler, due to the temperature difference and the thermal expansion difference between the structural member 1 and the refractory members 2 and 3,
Thermal stress analysis has revealed that compressive stress acts on the refractory members 2 and 3.

In the case of the conventional apparatus, as shown in FIG. 4, this compressive stress 11 acts to cause the refractory member 02 and the refractory member 03.
If some peeling occurs between the gaps, this gap is generally 1
Since the interval of 2 is non-uniform, the compressive stress 11 causes the protrusion 10 to occur.

In this embodiment, since the concavo-convex portion 6 as shown in FIG. 1 is provided on the contact surface between the refractory member 2 and the refractory member 3, the concavo-convex portion 6 is caught by the compressive stress. Further, the refractory member 3 is prevented from protruding, the tensile load acting on the anchor stud 4 can be reduced, and creep rupture can be prevented.

As for the shape of the uneven portion 6 formed on the contact surfaces of the refractory members 2 and 3 when viewed from the high temperature atmosphere side 5, it has a slit shape or a round hole shape provided on a slope to prevent slipping of the automobile. It may be one.

In this embodiment, an application example to the cyclone part of the fluidized bed boiler is explained.
The present invention is not limited to this, and can be applied to any furnace having a high temperature atmosphere inside.

[0015]

INDUSTRIAL APPLICABILITY The present invention relates to a refractory device provided with a refractory member laminated inside a structural member forming an outer wall of a furnace and supported by anchor studs. Due to the formation of the parts, the above-mentioned uneven parts act to oppose the force that pushes out the refractory member generated at high temperature inside the furnace to the inside of the furnace, so the tensile load acting on the anchor stud is reduced. It is possible to prevent the anchor stud from breaking due to high temperature creep.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a fireproof device according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a fluidized bed boiler.

FIG. 3 is an explanatory view of a conventional fireproof device.

FIG. 4 is an explanatory view of the operation of the conventional device.

[Explanation of symbols] 1 structural member 2 fireproof member (structural member side) 3 fireproof member (high temperature atmosphere side) 4 anchor stud 5 high temperature atmosphere side 6 uneven portion 7 tube 8 cyclone 8a inlet 9 boiler

Claims (1)

[Claims] 1. A refractory member having two or more layers formed inside a structural member whose interior forms the outer wall of a high temperature furnace, and an anchor coupled to the structural member and supporting the refractory member. A fireproof device including studs, comprising: a plurality of concave and convex portions formed on respective contact surfaces of the fireproof member, which are in contact with each other, and which are fitted to the adjacent fireproof members.