JP2009097844A - Top type lime kiln preheat zone ceiling part structure, metal hanger and hanger brick - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hanger, efficiently performing knocking of bricks and updating of a metal hanger in repairing work for preheat zone ceiling brick in a top type lime kiln, and relaxing stress concentration to a brick hanging part, which is a factor in causing damage of the brick. <P>SOLUTION: The basic brick of the preheat zone ceiling is made lighter than the conventional one, and a hole is previously bored in a hanging part. The hole part is hooked by a special metal hanger, and a set of two bricks is hung from the outside of the furnace. A brick stop plate is installed in every rotating direction line, thereby relaxing stress concentrated on the hanger part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ceiling structure, a hanging bracket, and a hanging brick for holding a hanging brick of a top type lime furnace pre-tropical ceiling.

  Usually, the Koma type lime furnace pre-tropical ceiling is a hanging metal fitting with a trapezoidal cross section that is welded to a ceiling iron plate, and has a structure that hooks a brick having a trapezoidal groove.

  The top of the ceiling to which the hanging bracket is welded is a cooling jacket (air-cooled or water-cooled) in order to prevent heat degradation of the hanging bracket.

  An iron plate and a fireproof wet felt are inserted between the hanging brick and the hanging bracket, and the brick is fixed.

  In order to prevent the hanging bricks from dropping off, the contact surface with the adjacent bricks is stepped, and is devised to increase the contact area.

  In recent years, the use conditions of the Koma type lime furnace have become more severe than before due to the fuel used. For pretropical ceiling bricks, which are the most severely damaged, it has become difficult to operate continuously for a long period of time only by improving the quality of the bricks.

The repair work for pre-tropical ceiling bricks in the Koma type lime furnace is cold repair without exception, and the dismantling work is in-furnace work. As bricks are dismantled, it is common to need to renew the hanging metal fittings, both of which are upward work, which is inefficient and takes time. In addition, the fact that the bricks are large in shape and the stress is concentrated on the brick hanging parts during the furnace rotation also causes damage to the bricks. The problem is to eliminate these problems.
[0008] to [0016] are the current specific problems.

  [FIG. 1] [FIG. 2] is a conventional hanging metal fitting and hanging structure. Since the hanging metal fittings are in the furnace, corrosion due to the high temperature gas in the furnace causes wear.

  Along with the damage of the hanging brick, the damage of the hanging bracket is also promoted.

  In order to hold the hanging brick normally, it is most important that the hanging fitting is sound. Therefore, it is common to renew or partially repair the hanging bracket during repair of the furnace.

  Since the renewal of the hanger is an in-furnace operation, it is common to cool the furnace to a certain temperature, dismantle the brick in the furnace, blow it out, finish the mounting surface flat, and weld a new hanger. It is.

  Since the distance between the pre-tropical ceiling and the table is narrow, the work of [0011] is difficult and time-consuming, which inevitably increases the construction period.

  In addition, since the hanging brick is large and heavy, it is difficult to construct a furnace, and it is not easy to construct it uniformly over the entire circumference.

  The firing furnace has a suspended ceiling and is independent of the main body part. During operation, the main body part rotates by a certain amount every certain time. For this reason, a large mechanical stress is generated between the raw limestone and the hanging brick, and there are cases where the structure is deteriorated near the tip or at the hanging portion where the stress is concentrated at the early stage of the furnace, and the dropping occurs.

  When bricks fall off, mechanical stress on adjacent bricks is promoted and can cause the bricks to fall off in a chained manner.

  In addition, if the dropout occurs frequently, even if the pusher rod is not pushed in, the phenomenon that the limestone naturally flows continuously from the pre-tropical table, that is, the self-flow occurs, which causes the raw burn.

  The conventional hanging metal fitting shown in FIG. 1 is changed from the shape shown in FIG. 3 to the shape shown in FIG. 5, and as shown in FIG. 6 through FIG. After suspending with, secure it to the holding bracket installed outside the furnace. The height of the brick is adjusted by threading the upper end of the hanging bracket and tightening with a nut.

  Insert one brick stop plate shown in [Fig. 9] for every six rows of bricks in the rotational direction, and fix it to the holding bracket installed outside the furnace with bolts and nuts.

  As shown in FIG. 10, the hanging brick is made smaller and lighter than the conventional product, and a hole is provided so that two pieces can be lifted from the outside of the furnace as a set.

  By installing the hanging metal fittings outside the furnace, it becomes possible to prevent deterioration due to the high temperature gas in the furnace, and at the same time, since there is almost no deterioration damage, there is no need to renew every regular repair.

  Since the hanging bricks are reduced in size and weight and work is directed downwards outside the furnace, the accuracy of the furnace building is improved, and construction can be easily performed evenly around the entire circumference.

  Since the hanging bracket can be easily attached to the holding bracket by the bolt and nut method, the working time can be greatly shortened, and as a result, the construction period can be shortened.

  The reduction in the size and weight of the hanging brick and the downward work outside the furnace greatly improve the working efficiency, and as a result, the construction period can be shortened.

  Since the operations [0021] to [0023] are performed outside the furnace, they can be performed even if the inside of the furnace is not sufficiently cooled, and a partial replacement repair of a hanging brick that has been impossible in the past is also possible. It is.

  By installing the brick stop plate, it is possible to disperse the stress generated during the furnace rotation and prevent the brick from being damaged. As a result, the bricks that are generated at the early stage of the furnace are prevented from falling off, and the self-flow of limestone is not generated.

  [FIG. 3], [FIG. 4], [FIG. 5] show examples of the hanging metal fittings made in the present invention. [FIG. 6], [FIG. 7], [FIG. 8] show examples using the hanging brackets of [FIG. 3], [FIG. 4], [FIG. 5]. [FIG. 9] shows an example of a brick stop plate for relieving mechanical stress caused by bricks during the rotation of the furnace. FIG. 10 shows an example of a hanging brick.

The repair work results of the suspension structure according to the present invention are shown in the table below in comparison with the conventional results.

Conventional hanging bracket Conventional suspension structure Lower hanger for hanging outside the furnace Upper hanger for hanging outside the furnace Upper hanger for hanging outside the furnace New suspension structure (plan view from the top of the suspension bracket) New suspended structure (circumferential sectional view) How to hang brick Brick plate and holding bracket Hanging brick

Explanation of symbols

1: Hanging bracket 2: Brick 3: Caster 4: Iron plate + wet felt 5: Hanging bracket 6: Round hole 7: Round bar 8: Small square washer 9: Nut 10: Screw 11: Small square washer 12: Nut 13: Screw 14: Angle 15: Upper hanging bracket 16: Lower hanging bracket 17: Brick 18: Brick-stopping iron plate 19: Holding bracket 20: Bolt nut 21: Hanging brick hole

Claims (5)

  A brick-hanging bracket, characterized in that two pieces of pre-tropical ceiling bricks for a Koma type lime furnace are hung from the outside of the furnace.   A brick stop plate for preventing the brick from rotating due to the stress from the raw limestone during the rotation of the furnace, but a brick retaining plate for relaxing the stress concentrated on the suspension.   A basic brick that is smaller and lighter than conventional products, and has two holes and is hung from outside the furnace in pairs.   Furnace technology that allows hot tropical brick repairs.   Furnace technology that enables partial repair of pre-tropical ceiling bricks.

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