RU2718016C1 - Sinter machine furnace design - Google Patents

Abstract

FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely, to furnace for sintering of agglomeration charge on moving grate trolleys. Furnace comprises three roof steel air-cooled burner panels protected by refractories, used for heating and air supply to burners and serving as structural supports for burners and lining. As protective refractory there used are blocks made of light-weight fibrous refractory material, installed tightly to roof steel air-cooled burner panel, and burners are separated from blocks by metal heat-resistant casings, which protect light-weight fibrous fire-resistant material of blocks from erosion action of flame.EFFECT: invention makes it possible to repair the furnace by replacing any of three panels with broken lining without long-term stoppage of the unit for repair.1 cl, 4 dwg

Description

The invention relates to metallurgy, to sinter production, namely to a furnace for sintering a sinter charge on moving grate carts and consisting of three lined vaulted panels with burners.

Each of the three vault panels is made in the form of a vaulted steel air-cooled burner panel, insulated with lightweight fiber refractory materials, the design of which provides for the protection of burners with heat-resistant bushings.

The proposed design allows for the repair of the hearth by replacing even one of the three panels with a destroyed lining without a long-term stop of the unit for repair.

Known incendiary hearth (Fig. 1) of an agglomeration machine, providing a method of igniting a charge according to [1], containing vaulted steel air-cooled burner panels (Fig. 1, pos. 1), lined with tightly installed burner stones (Fig. 1, pos. 2), suspended on metal mounts (Fig. 1, item 3). In this case, an air gap is formed between the lining and the panel (Fig. 1, pos. 4), with fasteners (Fig. 1, pos. 3) of burner stones located in this volume. The air gap is one of the disadvantages of this design, leading to premature failure of the hearth in the event of a breakthrough of the flame in the designated volume in case of violation of the density of the arch during operation. In this case, the inevitable shutdown of production for long-term repair, as the replacement of any element of the lining will entail the analysis of the lining of all three hearth panels.

Also known is the design of burner stones for the incendiary furnace of an agglomeration machine developed by the Experimental Refractory Plant CJSC [2], FIG. 2. The shape of the burner stones used in this design (Fig. 2, pos. 2) eliminates direct gaps between them, but the constructive gap between the lining and the panel is preserved (Fig. 2, pos. 4), which also significantly reduces its life. A disadvantage remains, expressed in a limited number of heat exchangers for fireclay lining used in the design of the incendiary hearth of an agglomeration machine with burner stones.

These drawbacks - the bursting of flame under a burner stone and the limited number of heat exchangers of the applied refractory protection - are partially devoid of the hearth structure given in [3], in which the fireproof protection of alternating air-cooled panels and burner panels is made by alternating the lining of lightweight fibrous material and burner stones to protect burners. Moreover, for its implementation, a complete replacement of the existing hearth structure is required: a new supply of natural gas, air for cooling and combustion. And, despite the apparent duration of the campaign, positioned by the applicant [3], the repair of the hearth will require a complete analysis of the refractory elements — burner stones and fibrous blocks, which will also require significant time costs for repairs.

The proposed design of the hearth of the sinter machine (Fig. 4) is devoid of these disadvantages due to the installation of metal heat-resistant casings instead of burner stones to protect burners and fibrous refractory blocks from erosion.

According to the invention, the furnace of the sinter machine comprises three steel steel air-cooled burner panels protected by refractories, used for heating and supplying air to the burners and acting as structural supports for the burners and lining, while blocks made of lightweight fibrous refractory material are used as protective refractories, mounted close to the vaulted steel air-cooled burner panel, and the burners are separated from the blocks by metal heat-resistant casings, protecting the lightweight fibrous refractory material of the blocks against erosion by the torch.

In particular, the lining of each of the three burner panels is made separately with the possibility of disconnecting the panel requiring repair from the hearth to replace it.

With reference to FIG. 4 are indicated: 1 - vaulted steel air-cooled burner panel; 5 - heat-resistant casing; 6 - refractory lightweight fibrous block.

The casings 5 are placed in refractory lightweight fibrous blocks 6, mounted close to the air-cooled panel 1 of the hearth without an air gap (Fig. 3 "a"), while the design according to [2] (Fig. 3 "b") is vulnerable to the point of view of the breakthrough of the flame into the air gap (Fig. 3 "b", item 4) and the subsequent complete analysis of the lining of the hearth for repair.

When implementing the proposed technical solution (Fig. 4), a major change in the design of the hearth is not required, the design of a new gas supply path and subsequent state examinations and other organizational and regulatory actions are excluded. Moreover, the design of the furnace of the sinter machine (Fig. 4) provides for the possibility of lining each of the three burner panels separately during preparation for repair before installing them directly on the sinter machine, which reduces the time required to repair or replace the lining of the furnace of the sinter machine.

During operation of the sinter machine, it is possible to disconnect and replace only the vault panel that needs repair from the common hearth for replacement.

The proposed design of the furnace sinter machine is industrially applicable.

The author does not know the technical solution in which the furnace lining of an agglomeration machine is made of refractory lightweight blocks with protective metal heat-resistant housings housed in them for placing the burners.

Literature

1. Gerasimov L.K. and others. "The method of ignition of the sinter charge ...". Patent No. 2275435 of 08/12/2004, JSC "VNIIMT", Publ. 04/27/2006

2. Production drawing 1220.00SB. Lining of burner panels. CJSC Experimental Refractory Plant, Verkhnyaya Pyshma, Sverdlovsk Region 2011 year

3. Vintovkin A.A. and others. "Horn for ignition of the sinter charge ...". Patent No. 2626370 dated 08.24.2016, OJSC VNIIMT, publ. 07/26/2017

Claims (2)

1. The hearth of an agglomeration machine, comprising three steel steel air-cooled burner panels protected by refractories, used to heat and supply air to the burners and acting as structural supports for burners and lining, characterized in that the blocks made of lightweight fiber are used as protective refractories refractory material installed close to the vaulted steel air-cooled burner panel, and the burners are separated from the blocks by metal heat-resistant casings that protect and lightweight fibrous refractory material blocks from erosion by the torch. 2. A furnace of an agglomeration machine according to claim 1, characterized in that the lining of each of the three burner panels is made separately with the possibility of disconnecting the panel requiring repair from the furnace for its replacement.

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