Anti-corrosion acid-resistant flue duct for calcination kiln and construction method thereof

Abstract

The application discloses an anti-corrosion acid-resistant flue gas exhaust pipeline for a calcination kiln and a construction method, the anti-corrosion acid-resistant flue gas exhaust pipeline comprises a wave-shaped ceramic lining, and a metal bent protective plate is arranged on the outer surface of the wave-shaped ceramic lining; the flue of the kiln is provided with the anti-corrosion acid-resistant flue gas exhaust pipeline; the anti-corrosion acid-resistant flue gas exhaust pipeline greatly improves the corrosion resistance and acid resistance of the flue gas exhaust pipeline system, prolongs the maintenance period, and prolongs the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding technology, in particular to an anticorrosion acid-resistant flue gas duct for calcination kiln and a construction method. BACKGROUND

[0002] The calcination kiln is a commonly used kiln equipment in industrial production. Waste gas is continuously generated during the production process of the calcination kiln and is discharged through the flue gas duct. The existing flue gas duct of the calcination kiln is generally made of metal material, and stainless steel is used for good quality. In the production process of lithium batteries, lithium mica, lithium slag and the like need to be calcined, and various acid waste gas is generated during the calcination process of these materials. The traditional calcination kiln continuously corrodes the inner wall of the flue gas duct when the acid waste gas passes through the flue gas duct during the calcination of lithium mica. The flue gas duct is corroded and damaged in 10-20 days or 2-3 months, resulting in waste gas leakage, the need for kiln shutdown for maintenance and replacement of the flue gas duct, and negative impact on production progress. In order to improve the corrosion resistance of the duct, the usual practice is to lay a corrosion-resistant material on the inner wall of the duct. However, most of the flues and flue gas ducts of the calcination kiln are narrow and small in size, and it is not possible to enter the inside of the duct for construction. Moreover, the flue gas duct is mostly made of a metal pipe, and it is not possible to add a corrosion-resistant layer on the wall of the pipe. SUMMARY

[0003] The main purpose of the present application is to solve the problem of poor acid resistance and corrosion resistance of the flue gas duct of the traditional calcination kiln, short service life, and the inability to add a corrosion-resistant lining material for construction. The present application provides an acid-resistant and corrosion-resistant flue gas duct for a calcination kiln.

[0004] The specific scheme of the present application is as follows: an acid-resistant and corrosion-resistant flue gas duct for a calcination kiln, comprising a furnace body, a hearth is arranged in the furnace body, a plurality of flues are arranged on both sides of the furnace body along the length direction of the flue gas discharge section, the bottom end of each flue is communicated with the hearth, and one flue gas duct is connected to the top end of each flue. The flue gas duct comprises a wave-shaped ceramic lining, and a metal bent guard plate is arranged on the outer surface of the wave-shaped ceramic lining. The wave-shaped ceramic lining is made of a plurality of wave-shaped ceramic bricks, and a pre-embedded metal reinforcing member is arranged at intervals between the wave-shaped ceramic bricks. The metal bent guard plate is welded with the pre-embedded metal reinforcing member.

[0005] Further, the wave-shaped ceramic bricks are arranged in a staggered manner, and the joints are coated with corrosion-resistant glue.

[0006] Further, the smoke exhaust pipe comprises horizontal branch pipes and vertical branch pipes, the vertical branch pipes comprise corrugated ceramic lining pipes built along the vertical direction, and four outer walls of the corrugated ceramic lining pipes are provided with metal bending protective plates along the length direction; the horizontal branch pipes comprise metal bending grooves, and an inner lining groove is arranged in the metal bending grooves along the whole length, the inner lining groove is built by a plurality of corrugated ceramic bricks, a corrosion-proof cover plate is arranged on the top of the inner lining groove along the whole length, and the top surface of the corrosion-proof cover plate is provided with a metal bending protective plate.

[0007] Further, the top of the smoke exhaust section of the furnace body is provided with a vertical branch pipe corresponding to the outlet of each flue, the vertical branch pipes located on the same side are arranged in a row and the top ends of the vertical branch pipes are connected to a horizontal branch pipe, and the bottom of the horizontal branch pipe is provided with a through hole corresponding to each vertical branch pipe; a connecting pipe is arranged between the two horizontal branch pipes, one of the horizontal branch pipes is provided with a main smoke exhaust pipe, the main smoke exhaust pipe and the connecting pipe have the same structure as the corrosion-proof and acid-resistant smoke exhaust pipe, and the outer end of the main smoke exhaust pipe is connected to an induced draft fan.

[0008] Further, the outer end of the main smoke exhaust pipe is provided with a fan connecting box, the fan connecting box comprises a support frame, the top of the support frame is provided with a bottom plate, the top of the bottom plate is built with an inner lining box body, the top surface of the inner lining box body is provided with a corrosion-proof cover plate, the bottom surface of the corrosion-proof cover plate is provided with a corrugated ceramic lining, the side surface of the inner lining box body is provided with a metal protective plate, and the side surface of the inner lining box body is provided with a fan interface.

[0009] The application further provides a construction method of the corrosion-proof and acid-resistant smoke exhaust pipe of the calcination kiln, comprising the following steps: S1, corrugated ceramic bricks are built along the vertical direction at the outlet of each flue on the top of the kiln smoke exhaust section to form vertical branch pipes, the flue holes of the vertical branch pipes are communicated with the corresponding flues, and after the building, a metal bending protective plate is arranged on each of the four side surfaces of the outer wall of the vertical branch pipes;

[0010] S2, after the preparation of all the vertical branch pipes, two horizontal branch pipes are prepared, the two horizontal branch pipes are respectively arranged at the top of a row of vertical branch pipes on the two sides of the kiln smoke exhaust section, and the preparation process of the horizontal branch pipes is as follows: firstly, a metal bending groove with a U-shaped longitudinal section is prepared, the length of the metal bending groove is equivalent to the length of the kiln smoke exhaust section, the metal bending groove is placed on the top of the corresponding row of vertical branch pipes, a through hole is arranged on the bottom surface of the metal bending groove corresponding to each vertical branch pipe, the metal bending groove is connected and fixed with the outer metal bending protective plate of the vertical branch pipe, and then corrugated ceramic bricks are built in the inner bottom surface and the two side walls of the metal bending groove, after the building, a corrosion-proof cover plate is laid on the top of the metal bending groove, and a layer of metal bending protective plate is arranged on the top surface of the corrosion-proof cover plate as protection;

[0011] S3, a connecting pipe is arranged between the two horizontal branch pipes, the bottom of the connecting pipe is provided with a support frame, the support frame is arranged on the top of the kiln, and the preparation method of the connecting pipe is the same as that of the horizontal branch pipe;

[0012] S4, a main smoke exhaust duct is erected on the side facing the induced draft fan, the structure and manufacturing method of the main smoke exhaust duct are similar to those of the connecting pipe, and the outer end of the main smoke exhaust duct is connected to the top surface of the fan connecting box.

[0013] Further, in the S1 step, the wave-shaped ceramic bricks are arranged in staggered joints during masonry, the cross section of the vertical branch pipe is rectangular, and a metal reinforcing member is pre-buried between the wave-shaped ceramic bricks at intervals during the masonry process, and the metal bent protective plate is welded and fixed to the pre-buried metal reinforcing member.

[0014] Compared with the prior art, the present application has the following advantages: 1. By improving the kiln smoke exhaust duct, a pipeline with strong corrosion resistance and acid resistance is used to improve the corrosion resistance of the smoke exhaust duct, so that it can adapt to the calcination of lepidolite and lithium slag; 2. A unique masonry process is used, the trench is masonry first, and then the cover plate is laid on the top, which facilitates construction and enables the corrosion-resistant pipeline to be implemented, and effectively improves the acid-resistant and corrosion-resistant performance of the smoke exhaust duct. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the front view of the calcination kiln of the present application;

[0016] Figure 2 is the top view of Figure 1 ;

[0017] Figure 3 is the A-A view of Figure 1 ;

[0018] In the drawings: 1, flue opening; 2, hearth; 3, flue; 4, vertical branch pipe; 5, flue hole; 6, metal bent protective plate; 7, wave-shaped ceramic brick; 8, horizontal branch pipe; 9, connecting pipe; 10, main smoke exhaust duct; 11, fan connecting box; 12, induced draft fan; 13, cover plate. DETAILED DESCRIPTION

[0019] Example 1

[0020] Referring to Figures 1-3 , the present embodiment provides a corrosion-resistant and acid-resistant smoke exhaust duct for a calcination kiln, which comprises a furnace body, a hearth 2 is arranged in the furnace body, a plurality of flues 3 are arranged on both sides of the furnace body along the length direction of the smoke exhaust section, the bottom end of each flue 3 is communicated with the hearth 2, and one smoke exhaust duct is connected to the top end of each flue 3, wherein the smoke exhaust duct comprises a wave-shaped ceramic lining, and a metal bent protective plate 6 is arranged on the outer surface of the wave-shaped ceramic lining. Further, the wave-shaped ceramic lining is formed by masonry of a plurality of wave-shaped ceramic bricks 7, a pre-buried metal member is arranged between two adjacent wave-shaped ceramic bricks 7, and the metal bent protective plate 6 is welded to the pre-buried metal member. Further, the wave-shaped ceramic bricks 7 are arranged in staggered joints, and the joints are coated with corrosion-resistant glue.

[0021] The smoke exhaust duct of the embodiment comprises horizontal branch pipes 8 and vertical branch pipes 4. The horizontal branch pipes 8 comprise a bottom plate, and a groove is built on the upper surface of the bottom plate along the whole length, the groove is composed of a plurality of waved ceramic tiles 7, and a cover plate 13 is arranged on the top of the groove along the whole length, and the bottom surface of the cover plate 13 is provided with a corrosion-resistant layer. The vertical branch pipes 4 comprise waved ceramic inner lining pipes built in the vertical direction, and metal bent protective plates 6 are arranged on the four outer wall surfaces of the waved ceramic inner lining pipes along the length direction.

[0022] Further, a vertical branch pipe 4 is arranged at the top of the smoke exhaust section of the furnace body corresponding to the outlet of each flue 3, the vertical branch pipes 4 on the same side are arranged in a row and the top ends are jointly connected to a horizontal branch pipe 8, and the bottom of the horizontal branch pipe 8 is provided with a through hole corresponding to each vertical branch pipe 4; a connecting pipe 9 is arranged between the two horizontal branch pipes 8, one of the horizontal branch pipes 8 is provided with a main smoke exhaust duct 10, the main smoke exhaust duct 10 and the connecting pipe 9 have the same structure as the corrosion-resistant and acid-resistant smoke exhaust duct, and the outer end of the main smoke exhaust duct 10 is connected to an induced draft fan 12. Further, the outer end of the main smoke exhaust duct 10 is provided with a fan connecting box 11, the fan connecting box 11 comprises a support frame, the top of the support frame is provided with a bottom plate, the top of the bottom plate is built with an inner lining box body, the top surface of the inner lining box body is provided with a corrosion-resistant cover plate 13, the bottom surface of the corrosion-resistant cover plate 13 is provided with waved ceramic lining, the side surface of the inner lining box body is provided with a metal protective plate, and the side surface of the inner lining box body is provided with a fan interface.

[0023] Embodiment two

[0024] The embodiment is a construction method for reforming the smoke exhaust duct system of a traditional calcination kiln, and the specific construction process is as follows: first, waved ceramic tiles 7 are built in the vertical direction at the outlets of each flue 3 of the top of the smoke exhaust section of the kiln to form vertical branch pipes 4, the flue holes 5 of the vertical branch pipes 4 are communicated with the corresponding flues 3, the waved ceramic tiles 7 are arranged in a staggered manner during the building, the cross section of the vertical branch pipes 4 is rectangular, and during the building process, metal reinforcing members are pre-buried between two waved ceramic tiles 7 at intervals, and after the building, a metal bent protective plate 6 is arranged on each of the four side surfaces of the outer wall of the vertical branch pipes 4, and the metal bent protective plate 6 is welded and fixed with the pre-buried metal reinforcing members.

[0025] After all the vertical branch pipes 4 are made, two horizontal branch pipes 8 are made, which are respectively located at the top of a row of vertical branch pipes 4 on both sides of the kiln. The production process of the horizontal branch pipes 8 is as follows: first, a metal bending groove with a U-shaped longitudinal section is made, the length of the metal bending groove is equivalent to the length of the kiln, the metal bending groove is placed at the top of a corresponding row of vertical branch pipes 4, a through hole is provided on the bottom surface of the metal bending groove corresponding to each vertical branch pipe 4, the metal bending groove is connected and fixed with the external metal bending guard plate 6 of the vertical branch pipe 4, then the inner bottom surface and the two side walls of the metal bending groove are built with corrugated ceramic bricks 7, after the building is completed, a corrosion-resistant cover plate 13 is laid on the top of the metal bending groove, the material of the corrosion-resistant cover plate 13 is also corrugated ceramic, and a layer of metal bending guard plate 6 is provided on the top surface of the corrosion-resistant cover plate 13 as protection;

[0026] Then a connecting pipe 9 is erected between the two horizontal branch pipes 8, the bottom of the connecting pipe 9 is provided with a support frame, the support frame is arranged on the top of the kiln, and the production method of the connecting pipe 9 is the same as that of the horizontal branch pipe 8;

[0027] Finally, a main smoke exhaust pipe 10 is erected on the side facing the induced draft fan 12, the structure and production method of the main smoke exhaust pipe 10 are similar to those of the connecting pipe 9, the outer end of the main smoke exhaust pipe 10 is connected with the top surface of the fan connecting box 11 which is made in advance, one fan connecting port is reserved on each side of the fan connecting box 11, and two induced draft fans 12 are used, one standby and one in use.

Claims

1. A kind of anticorrosive acid-resistant flue duct for calcining kiln, including furnace body, be equipped with hearth in furnace body, the length direction of furnace body flue gas discharge section two sides each is equipped with several flues, the bottom end of flue is communicated with hearth, it is characterized by: Each flue is connected with a flue gas duct, the flue gas duct comprises a waved ceramic lining, and the outer surface of the waved ceramic lining is provided with a metal bending guard plate; the waved ceramic lining is built by a plurality of waved ceramic bricks, and a pre-buried metal reinforcing member is arranged at intervals between the waved ceramic bricks, and the metal bending guard plate is welded with the pre-buried metal reinforcing member; The flue gas duct comprises horizontal branch pipes and vertical branch pipes, the vertical branch pipes comprise waved ceramic lining pipes built in the vertical direction, and the four outer wall surfaces of the waved ceramic lining pipes are provided with metal bending guard plates along the length direction; the horizontal branch pipes comprise metal bending grooves, and an inner lining groove is arranged in the metal bending grooves along the whole length, the inner lining groove is built by a plurality of waved ceramic bricks, and a corrosion-proof cover plate is arranged on the top of the inner lining groove along the whole length, and the top surface of the corrosion-proof cover plate is provided with a metal bending guard plate; The waved ceramic bricks are arranged in a staggered manner, and the joints are coated with corrosion-proof glue.

2. A corrosion-proof acid-resistant flue for a calcining kiln according to claim 1, characterized in that: The top of the flue gas discharge section of the furnace body is provided with a vertical branch pipe corresponding to the outlet of each flue, the vertical branch pipes arranged on the same side are arranged in a row and are connected with a horizontal branch pipe at the top, the bottom of the horizontal branch pipe is provided with a through hole corresponding to each vertical branch pipe, and a connecting pipe is arranged between the two horizontal branch pipes, one of the horizontal branch pipes is connected with a main flue gas duct, the main flue gas duct and the connecting pipe are of the same structure as the corrosion-resistant acid-resistant flue gas duct, and the outer end of the main flue gas duct is connected to an induced draft fan.

3. A corrosion-proof acid-resistant flue for a calcining kiln according to claim 2, characterized in that: The outer end of the main flue gas duct is provided with a fan connecting box, the fan connecting box comprises a support frame, the top of the support frame is provided with a bottom plate, the bottom plate is built with a lining box body around, the top surface of the lining box body is provided with a corrosion-proof cover plate, the bottom surface of the corrosion-proof cover plate is provided with a waved ceramic lining, the side surface of the lining box body is provided with a metal guard plate, and the side surface of the lining box body is provided with a fan interface.

4. The construction method for the anticorrosive acid-proof flue duct of calcination kiln according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1, waved ceramic bricks are built in the vertical direction at the flue outlets of the furnace top of the kiln flue gas discharge section to form vertical branch pipes, the flue holes of the vertical branch pipes are communicated with the corresponding flues, and after the building, a metal bending guard plate is arranged on each of the four side surfaces of the outer wall of the vertical branch pipes; S2, after all the vertical branch pipes are made, two horizontal branch pipes are made, the two horizontal branch pipes are arranged at the top of a row of vertical branch pipes on the two sides of the kiln flue gas discharge section, and the horizontal branch pipes are made in the following process: firstly, a metal bending groove with a U-shaped longitudinal section is made, the length of the metal bending groove is equivalent to the length of the kiln flue gas discharge section, the metal bending groove is placed at the top of the corresponding row of vertical branch pipes, a through hole is arranged on the bottom surface of the metal bending groove corresponding to each vertical branch pipe, the metal bending groove is connected and fixed with the outer metal bending guard plate of the vertical branch pipe, and then waved ceramic bricks are built in the inner bottom surface and the two side walls of the metal bending groove, after the building, a corrosion-proof cover plate is laid on the top of the metal bending groove, and a metal bending guard plate is arranged on the top surface of the corrosion-proof cover plate as a protection; S3, a connecting pipe is arranged between the two horizontal branch pipes, the bottom of the connecting pipe is provided with a support frame, the support frame is arranged on the top of the kiln, and the connecting pipe is made in the same way as the horizontal branch pipe. S4, erect the main flue duct on the side facing the fan, the structure and manufacturing method of the main flue duct are similar to those of the connecting pipe, and the outer end of the main flue duct is connected with the top surface of the fan connecting box.

5. The construction method for the anticorrosive acid-proof flue duct of calcination kiln according to claim 4, characterized in that: In the step S1, the wave-shaped ceramic tiles are arranged staggeredly during masonry, the cross section of the vertical branch pipe is rectangular, and a metal reinforcing member is embedded between the wave-shaped ceramic tiles at intervals during the masonry process, and the metal bent guard plate is welded and fixed with the embedded metal reinforcing member.

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