CN104019314A - Construction method for lining of high-temperature expansion joint of dry quenching furnace - Google Patents

Abstract

The invention relates to a lining construction method for a high-temperature expansion joint of a CDQ furnace, comprising the following steps: 1) forming a concave-convex staggered seam by making the primary dust removal vault close to the side line of the expansion joint; Concave and convex staggered joints; 3) Refractory bricks are used to build two bricks from the primary dust removal side and CDQ side to the middle to the width of the whole brick, and the side lines on both sides still maintain concave and convex staggered joints; 4) Step 3) on both sides The recessed position is built with half a block of refractory bricks, so that the edges form a flat gap; 5) On the upper surface of the refractory bricks, a layer of heat-insulating bricks is used to lay flat; 6) Ceramics are inserted into the gaps left The fiber blanket is compacted, and clay brick particles are filled between the heat insulation brick and the top steel plate of the primary dust removal. Compared with the prior art, the beneficial effect of the present invention is that it can effectively extend the service life of the CDQ expansion joint lining, enhance the heat insulation effect, ensure the tightness of the furnace body, make the CDQ production process more stable, and extend the maintenance cycle .

Description

A Construction Method for the Lining of High Temperature Expansion Joint of Dry Quenching Furnace

technical field

The invention relates to the field of coke dry quenching equipment, in particular to a construction method for lining a high temperature expansion joint of a dry quenching furnace.

Background technique

In the conventional design, the inner lining of the high-temperature rectangular expansion joint of the CDQ furnace is casted with a combination of refractory castables and heat-insulating castables. The minimum thickness of the upper castable layer is 250mm, and the maximum is 450mm. The thickness of the castable layer is only about 125mm, and an obvious separation layer is formed between the two castables. The upper layer of heat-insulating castables does not have much strength after sintering. Although the embedded castable pendant can penetrate the entire heat-insulated castable layer, it has little effect on the support and fixation of the castable. Although the lower layer of refractory castable has good strength after sintering , but during the pouring process, it must be ensured that all the pendants must be buried inside the castable and cannot directly contact the high-temperature air flow, so that the pendants cannot penetrate the entire castable layer. In addition, the thickness of the castable layer is relatively small, so it is difficult to withstand the entire upper part of the expansion joint. The weight of the lining, in addition, the castable material is different from the refractory bricks on both sides, and cannot be completely integrated during construction. Therefore, the vault position of the high-temperature rectangular expansion joint is prone to collapse and fall of the lining castable material, and the internal pendant is burned.

Contents of the invention

The present invention overcomes the deficiencies of the prior art and provides a construction method for the inner lining of the high-temperature expansion joint of the CDQ furnace, which can effectively prolong the service life of the inner lining of the CDQ expansion joint, enhance the heat insulation effect, and ensure that the furnace body is tight, stable and dry. Coke quenching production process.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A construction method for the inner lining of the high-temperature expansion joint of a CDQ furnace, which changes the inner lining of the expansion joint from traditional castables to refractory bricks and heat-insulating bricks, and increases the thickness of the inner lining, including the following steps:

1) Reserve a staggered interface when building a dust-removing vault close to the expansion joint, and stagger the distance of half a block of bricks, so that the side line forms a concave-convex staggered joint;

2) Reserve a staggered interface when the side of the CDQ is close to the expansion joint, and stagger the distance of half a brick so that the side line forms a concave-convex staggered joint;

3) Refractory bricks are used to build two bricks from the primary dust removal side and the CDQ side to the middle to the width of the whole brick, and the side lines on both sides still maintain uneven joints;

4) In step 3), half of the refractory bricks are used to build the recessed positions on both sides, so that the sidelines form a smooth gap, which is reserved as the expansion joint of the expansion joint;

5) On the upper surface of the refractory bricks, use heat-insulating bricks to build a layer;

6) Insert a ceramic fiber blanket into the gap left for compaction, and fill the gap between the insulation brick and the top steel plate of the primary dust removal with clay brick particles.

The refractory bricks are mullite bricks.

The heat insulating bricks are clay bricks.

Compared with prior art, the beneficial effect of the present invention is:

1) Use mullite bricks and heat insulation bricks instead of conventional refractory castables and heat insulation castables to prolong the service life of the CDQ expansion joint lining;

2) The thickness of the inner lining is increased, which effectively enhances the heat insulation effect and ensures the stability of the pressure system of the CDQ furnace;

3) The operation process is simple and the source of materials is convenient, which is conducive to reducing the maintenance cost of the CDQ furnace.

Description of drawings

Fig. 1 is a schematic structural view of the inner lining of the high temperature expansion joint of the CDQ furnace according to the present invention.

Fig. 2 is a structural schematic diagram of the expansion joint liner poured with castables in the conventional design.

In the figure: 1. First-time dust removal top steel plate 2. Expansion joint steel beam 3. Expansion joint bellows 4. Refractory brick 5. Heat insulation castable 6. Ceramic fiber blanket 7. Refractory castable 8. Clay brick particles 9. Heat insulation Brick 10. Convex expansion joint

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

See Fig. 1, which is a structural schematic diagram of the lining of the high-temperature expansion joint of the CDQ furnace according to the present invention. The construction method of the lining of the high-temperature expansion joint of the CDQ furnace of the present invention changes the lining of the expansion joint from traditional castables to refractory bricks and insulation bricks, and increase the lining thickness, including the following steps:

1) Reserve a staggered interface when building a dust-removing vault close to the expansion joint, and stagger the distance of half a block of bricks, so that the side line forms a concave-convex staggered joint;

2) Reserve a staggered interface when the side of the CDQ is close to the expansion joint, and stagger the distance of half a brick so that the side line forms a concave-convex staggered joint;

3) Refractory bricks 4 are used to build the width of two bricks from the primary dust removal side and CDQ side to the middle respectively, and the side lines on both sides still maintain uneven joints;

4) In step 3), the recessed positions on both sides are built with half refractory bricks 4, so that the sidelines form flat gaps, which are reserved as expansion joints for expansion joints;

5) On the upper surface of the refractory brick 4, heat insulating bricks 9 are used to tile and build a layer;

6) Insert the ceramic fiber blanket 6 into the gap left for compaction, and fill the clay brick granules 8 between the heat insulation brick 9 and the top steel plate 1 for primary dust removal.

The refractory brick 4 can be selected from mullite bricks, and the heat insulating brick 9 can be selected from clay bricks.

The following examples are carried out on the premise of the technical solutions of the present invention, and detailed implementation methods and specific operation processes are provided, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[Example 1] Structural modification of the inner lining of the CDQ furnace expansion joint in a coking plant using the method described in the present invention

In this example, the lining of the high-temperature rectangular expansion joint of the original CDQ furnace is casted with a combination of refractory castable 7 and heat-insulating castable 5. The minimum thickness of the upper castable layer is 250 mm, and the maximum is 450 mm. All castables are divided into two layers. , the castable thickness of each layer is only about 125mm. In this embodiment, the upper heat-insulating castable 5 is CL-100, and the lower layer of refractory castable 7 is CZHO27. An expansion joint steel beam 2 is arranged above the heat-insulated castable 5, and an expansion joint is provided in the gap between the heat-insulated castables 5. The joint bellows 3 and the gap formed by the refractory castable 7 are filled with ceramic fiber blankets 6 .

The content of this modification is to change the lining of the expansion joint from castable to refractory brick 4 and heat insulation brick 9. Since the inner boundary of the original masonry is neat, if it is directly built, it will form a "through joint" masonry. Not only will it affect the strength of the arch, but it will also cause displacement of the vault and leakage. Therefore, it is necessary to renovate the original masonry so that the brickwork on both sides of the expansion joint is integrated with the original masonry, leaving only the center of the expansion joint. an expansion joint. In this embodiment, the refractory bricks are mullite bricks with a thickness of 230 mm; the heat insulating bricks are clay bricks with a thickness of 114 mm.

The specific process is as follows:

1) Remove half a brick at the position near the expansion joint of the primary dust removal vault to form a staggered interface, so that the side line forms a concave-convex staggered joint;

2) Remove half a brick at the position near the expansion joint on the side of the CDQ to form a staggered joint, so that the side line forms a concave-convex staggered joint; and build two whole bricks with mullite bricks 4 from both sides to the middle. width;

3) Mullite bricks are used to build the width of two bricks from the primary dust removal side and the CDQ side to the middle respectively, and the side lines on both sides still maintain concave and convex staggered joints;

4) In step 3), half of the mullite bricks are used to build the recessed positions on both sides, so that the sidelines form a smooth gap, which is reserved as the expansion joint of the expansion joint;

5) On the upper surface of the mullite bricks, clay bricks are used to tile and build a layer;

6) Insert a ceramic fiber blanket into the gap left for compaction, and fill the clay brick granules 8 between the clay brick and the top steel plate 1 for primary dust removal.

In this embodiment, according to the construction method of the CDQ furnace high-temperature expansion joint lining in the present invention, after the CDQ furnace expansion joint lining structure is transformed, it forms an integral structure with the masonry on both sides, and the convex expansion joint 10 is used instead. The original expansion joint bellows 3 has a simpler structure, which can not only improve the service life of the expansion joint lining of the CDQ furnace, prolong the maintenance cycle of the CDQ furnace, but also increase the thickness of the lining from 250mm to 344mm, an increase of 37%. Clay brick particles 8 are filled between the dust removal top steel plate 1 and the heat insulation brick 9, which can effectively enhance the heat insulation effect.

Claims (3)

1. A construction method for the inner lining of a CDQ furnace high-temperature expansion joint, which changes the inner lining of the expansion joint from traditional castables to refractory bricks and heat-insulating bricks, and increases the thickness of the inner lining. It is characterized in that it includes the following steps: 1) Reserve a staggered interface when building a dust-removing vault close to the expansion joint, and stagger the distance of half a block of bricks, so that the side line forms a concave-convex staggered joint; 2) Reserve a staggered interface when the side of the CDQ is close to the expansion joint, and stagger the distance of half a brick so that the side line forms a concave-convex staggered joint; 3) Refractory bricks are used to build two bricks from the primary dust removal side and the CDQ side to the middle to the width of the whole brick, and the side lines on both sides still maintain uneven joints; 4) In step 3), half of the refractory bricks are used to build the recessed positions on both sides, so that the sidelines form a smooth gap, which is reserved as the expansion joint of the expansion joint; 5) On the upper surface of the refractory bricks, use heat-insulating bricks to build a layer; 6) Insert a ceramic fiber blanket into the gap left for compaction, and fill the gap between the insulation brick and the top steel plate of the primary dust removal with clay brick particles. 2. The construction method for the inner lining of a CDQ furnace high temperature expansion joint according to claim 1, wherein the refractory brick is a mullite brick. 3. A construction method for the inner lining of a CDQ furnace high temperature expansion joint according to claim 1, characterized in that the heat insulating brick is a clay brick.