Rotary kiln transfer chute lining

Abstract

The utility model relates to a rotary kiln transfer chute lining which comprises anchoring nails, a pouring layer, refractory bricks and brick supporting steel plates, the brick supporting steel plates are fixed on the periphery of the bottom edge of a shell of a transfer chute, the bottom ends of the anchoring nails are welded on the shell of the transfer chute, and the pouring layer is arranged in the shell of the transfer chute. The thickness of the pouring layer arranged near the upper edge, in the middle section and at the bottom of the shell of the transfer chute is greater than the thickness of the pouring layer arranged at other parts of the shell of the transfer chute; the refractory bricks are built on the thin pouring layer, and the surface of the transfer chute lining is flat. The utility model has the advantage of being suitable for the transfer chute position of the metallurgical lime rotary kiln. Through the combination of the pouring layer and the refractory bricks, the wear-resisting and scouring-resisting performance of the working face is improved by building the refractory bricks, and the service life of the rotary kiln transfer chute can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of rotary kiln production, and in particular relates to a rotary kiln transfer chute lining. Background Art

[0002] The main function of the transfer chute of the metallurgical lime rotary kiln is to transfer the partially decomposed limestone preheated by the preheater above to the rotary kiln body for calcination and decomposition. Since this part will be constantly hit and scoured by the limestone blocks falling from above, this requires that the lining refractory material of the transfer chute must have good wear resistance and scour resistance at a high temperature of 1200℃. Therefore, the selection of lining refractory materials and masonry methods of the transfer chute must be able to meet the requirements of the above application environment in order to ensure the long-term and stable operation of the rotary kiln transfer chute.

[0003] At present, the lining refractory materials used in the transfer chute of the metallurgical lime rotary kiln are mostly castables. Since the transfer chute is hit and eroded by limestone blocks for a long time, the castables in some parts of the transfer chute are often peeled off during the production process, which causes the refractory protective layer on the inner side of the steel structure (inclined surface) at this position of the transfer chute to become thinner or even completely peel off. At this time, the high-temperature gas at the end of the kiln will directly act on the steel structure at this position of the transfer chute, which will inevitably "burn red" or even "burn through" the steel structure. In the above situation, the kiln must be stopped immediately for repair, otherwise the production will not be able to operate normally. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a rotary kiln transfer chute lining to improve the wear resistance and erosion resistance of the transfer chute working surface and to increase the service life of the rotary kiln transfer chute.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A rotary kiln transfer chute lining comprises anchor nails, a casting layer, refractory bricks and a brick-supporting steel plate, wherein the brick-supporting steel plate is fixed around the bottom edge of a shell of the transfer chute, the bottom end of the anchor nail is welded to the shell of the transfer chute, the casting layer is arranged in the shell of the transfer chute, and the thickness of the casting layer arranged near the upper edge, the middle section and the bottom position of the shell of the transfer chute is greater than the thickness of the casting layer arranged in other parts of the shell of the transfer chute; the refractory bricks are laid on the thinner casting layer, and the surface of the transfer chute lining is flat.

[0007] The anchor nails are arranged in the casting layer. The length of the anchor nails arranged within 500mm from the upper edge of the shell of the transfer chute is 250±10mm, and the length of the anchor nails arranged within 300mm in the longitudinal direction of the middle section of the transfer chute is 250±10mm; the length of the anchor nails arranged within 300mm from the bottom of the shell of the transfer chute is 250±10mm; the length of the anchor nails arranged in other parts of the shell of the transfer chute is 80±5mm.

[0008] The thickness of the casting layer within 500mm from the upper edge of the shell of the transfer chute, within 300mm longitudinally of the middle section of the transfer chute, and within 300mm from the bottom of the shell of the transfer chute is 300±10mm; the thickness of the casting layer of the remaining part of the shell of the transfer chute is 100±10mm; the refractory bricks are laid on the casting layer with a thickness of 100±10mm.

[0009] The brick supporting steel plate is in the shape of a circular ring.

[0010] The casting layer is formed by casting a casting material, and the casting material is a silicon carbide casting material.

[0011] The refractory bricks have a thickness of 200 mm, a height of 50 mm and a width of 100 mm.

[0012] The refractory bricks are silicon carbide refractory bricks.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The rotary kiln transfer chute lining is suitable for use in the rotary kiln transfer chute position for producing metallurgical lime. By combining the casting layer with refractory bricks, the wear resistance and scouring resistance of the working surface are improved by masonry refractory bricks, which can extend the service life of the rotary kiln transfer chute, reduce the production cost of the rotary kiln, and improve the operation rate of the rotary kiln. The use of the transfer chute lining reduces the failure rate of the transfer chute and improves the operation rate of the rotary kiln. Reduce the number of maintenance times of the rotary kiln transfer chute and reduce maintenance costs. The transfer chute lining is safe and reliable and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure: 1-shell 2-brick supporting steel plate 3-casting layer 4-anchor nails 5-refractory bricks 6-limestone material 7-upper limit point 8-lower limit point. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0018] See Figure 1 A rotary kiln transfer chute lining, a casting layer 3 formed by replacing part of the castable material with refractory bricks 5 on the working surface of the rotary kiln transfer chute, specifically including anchor nails 4, casting layer 3, refractory bricks 5, brick support steel plate 2, the brick support steel plate 2 is fixed around the bottom edge of the shell 1 of the transfer chute, the bottom end of the anchor nail 4 is welded to the shell 1 of the transfer chute, the casting layer 3 is arranged in the shell 1 of the transfer chute, and is close to the shell 1 of the transfer chute, and the thickness of the casting layer 3 arranged near the upper edge, middle section, and bottom position of the shell 1 of the transfer chute is greater than the thickness of the casting layer 3 arranged in other parts of the shell 1 of the transfer chute; the refractory bricks 5 are masonry on the thinner casting layer 3, and the surface of the transfer chute lining is flat. The refractory bricks 5 are silicon carbide refractory bricks 5. The thickness of the refractory bricks 5 is 200mm, the height is 50mm, and the width is 100mm.

[0019] The anchor nail 4 is arranged in the casting layer 3, and the length of the anchor nail 4 is adjusted according to the different positions. The length of the anchor nail 4 arranged within 500mm from the upper edge of the shell 1 of the transfer chute is 250±10mm, the length of the anchor nail 4 arranged within 300mm (span) in the longitudinal direction of the middle section of the transfer chute is 250±10mm; the length of the anchor nail 4 arranged within 300mm from the bottom of the shell 1 of the transfer chute is 250±10mm; the length of the anchor nail 4 arranged in other parts of the shell 1 of the transfer chute is 80±5mm. The anchor nail 4 is buried in the casting layer 3 to improve the structural strength of the casting layer 3.

[0020] The thickness of the pouring layer 3 is adjusted according to different positions. The thickness of the pouring layer 3 within 500mm from the upper edge of the shell 1 of the transfer chute, within 300mm in the longitudinal direction of the middle section of the transfer chute, and within 300mm from the bottom of the shell 1 of the transfer chute is 300±10mm; the thickness of the pouring layer 3 in the rest of the shell 1 of the transfer chute is 100±10mm; the refractory bricks 5 are laid on the pouring layer 3 with a thickness of 100±10mm, so that most of the working surface of the transfer chute is silicon carbide refractory bricks 5. Using highly wear-resistant and scour-resistant silicon carbide refractory bricks 5 to replace castables can greatly improve the strength and scour resistance of the working surface of the transfer chute. In addition, the main purpose of retaining the pouring layer 3 with a span of 300mm in the middle section of the shell 1 and below 300mm from the lower edge of the transfer chute is to improve the masonry stability of the refractory bricks 5, thereby achieving the purpose of extending the service life of the rotary kiln transfer chute, and playing a good role in ensuring the smooth production of the rotary kiln.

[0021] The casting layer 3 is formed by casting a casting material, and the casting material is a silicon carbide casting material. The brick supporting steel plate 2 is annular and can support the casting layer 3 and the refractory bricks 5 built on the transfer chute shell 1.

[0022] During operation, the limestone material 6 is pushed into the transfer chute by the preheater push rod, wherein the upper limit point 7 of the limestone material 6 impacting the transfer chute is about 4m away from the brick supporting steel plate 2, and the lower limit point 8 of the limestone material 6 impacting the transfer chute is about 0.5m away from the brick supporting steel plate 2.

[0023] The utility model uses silicon carbide refractory bricks 5 to replace part of the castables and build them on the working surface of the rotary kiln transfer chute to achieve the purpose of improving the service life of the transfer chute. The refractory materials used in the working surface of the rotary kiln transfer chute lining are castables and anchor nails 4. The utility model reduces the thickness of the original casting layer 3 and uses silicon carbide refractory bricks 5 as the working surface. Because silicon carbide refractory bricks 5 have extremely high wear resistance and erosion resistance, they can greatly improve the performance and service life of the transfer chute.

Claims

1. A rotary kiln transfer chute lining, characterized in that: It includes anchor nails, a pouring layer, refractory bricks, and a brick-supporting steel plate. The brick-supporting steel plate is fixed around the bottom edge of the shell of the transfer chute. The bottom ends of the anchor nails are welded to the shell of the transfer chute. The pouring layer is arranged in the shell of the transfer chute, and the thickness of the pouring layer arranged near the upper edge, middle section, and bottom position of the shell of the transfer chute is greater than the thickness of the pouring layer arranged in other parts of the shell of the transfer chute; the refractory bricks are laid on the thinner pouring layer, and the surface of the inner lining of the transfer chute is flat.

2. The rotary kiln transfer chute lining according to claim 1, characterized in that: The anchor nails are arranged in the casting layer. The length of the anchor nails arranged within 500mm from the upper edge of the shell of the transfer chute is 250±10mm, and the length of the anchor nails arranged within 300mm in the longitudinal direction of the middle section of the transfer chute is 250±10mm; the length of the anchor nails arranged within 300mm from the bottom of the shell of the transfer chute is 250±10mm; the length of the anchor nails arranged in other parts of the shell of the transfer chute is 80±5mm.

3. The rotary kiln transfer chute lining according to claim 1, characterized in that: The thickness of the casting layer within 500mm from the upper edge of the shell of the transfer chute, within 300mm longitudinally of the middle section of the transfer chute, and within 300mm from the bottom of the shell of the transfer chute is 300±10mm; the thickness of the casting layer of the remaining part of the shell of the transfer chute is 100±10mm; the refractory bricks are laid on the casting layer with a thickness of 100±10mm.

4. The rotary kiln transfer chute lining according to claim 1, characterized in that: The brick supporting steel plate is in the shape of a circular ring.

5. The rotary kiln transfer chute lining according to claim 1, characterized in that: The casting layer is formed by casting a casting material, and the casting material is a silicon carbide casting material.

6. The rotary kiln transfer chute lining according to claim 1, characterized in that: The refractory bricks have a thickness of 200 mm, a height of 50 mm and a width of 100 mm.

7. The rotary kiln transfer chute lining according to claim 1, characterized in that: The refractory bricks are silicon carbide refractory bricks.

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