Thermal insulation structure of pulverized coal pyrolysis rotary kiln

Abstract

The utility model relates to a thermal insulation structure of a pulverized coal pyrolysis rotary kiln, which is characterized in that a plurality of layers of radiation heat dissipation pipe supports arranged at intervals are axially arranged on the inner wall of a rotary kiln cylinder, each layer comprises a plurality of radiation heat dissipation pipe supports arranged at intervals along the circumferential direction, and the radiation heat dissipation pipe supports of two adjacent layers are distributed in a staggered manner along the axial direction; a plurality of layers of anchoring nails arranged at intervals are further arranged on the inner wall of the rotary kiln barrel in the axial direction, each layer comprises a plurality of anchoring nails evenly arranged at intervals in the circumferential direction, each anchoring nail is sleeved with an arc-shaped heat preservation brick, and the arc-shaped heat preservation bricks are spliced and laid on the inner wall of the rotary kiln barrel. The end part of each radiation heat dissipation pipe bracket penetrates out of the arc-shaped heat preservation brick and is arranged in the rotary kiln cylinder body; castable is filled in the joints of the radiating pipe supports and the corresponding arc-shaped heat preservation bricks and the joints of every two adjacent arc-shaped heat preservation bricks. Stainless steel inner container pieces are arranged on all the radiation heat dissipation pipe supports in a sleeved mode, and all the stainless steel inner container pieces are spliced and laid on the surfaces of the arc-shaped heat preservation bricks.

Description

A thermal insulation structure for a pulverized coal pyrolysis rotary kiln Technical Field

[0001] This utility model relates to the field of rotary kiln insulation technology, specifically to an insulation structure for a pulverized coal pyrolysis rotary kiln. Background Technology

[0002] The rotary kiln for pulverized coal pyrolysis is a key piece of equipment used for coal pyrolysis. The main body of the rotary kiln is a horizontal cylindrical device. Inside the rotary kiln, multiple rows of heat dissipation and radiation tubes are installed. Hot flue gas from an external hot blast stove flows through the heat dissipation and radiation tubes, transferring heat to the pulverized coal inside the rotary kiln to complete the pyrolysis process, thereby decomposing it into products such as coal gas, tar, and clean coal, realizing the differentiated utilization of coal.

[0003] To improve pyrolysis efficiency and reduce energy consumption, rotary kiln insulation is an indispensable measure. There are two types of rotary kiln insulation: internal and external. External insulation generally uses heat-insulating refractory materials, such as asbestos-free high-temperature resistant calcium silicate insulation boards and high-temperature resistant heat-insulating coatings. However, if external insulation is used, the inner wall of the pulverized coal pyrolysis rotary kiln will be in direct contact with the pulverized coal material, presenting two problems: firstly, wear; secondly, the inner wall will withstand higher temperatures, requiring higher-quality materials and significantly increasing investment. Therefore, the most common method is to use insulating bricks and lightweight castable refractory for internal insulation, such as in cement kilns and lime kilns in the building materials industry. However, this method suffers from problems such as easy insulation layer detachment, short service life, and high maintenance frequency. Summary of the Invention

[0004] The purpose of this utility model is to provide a heat preservation structure for a pulverized coal pyrolysis rotary kiln.

[0005] The purpose of this utility model is achieved through the following technical solution: a heat preservation structure for a pulverized coal pyrolysis rotary kiln, comprising radiant heat dissipation pipe supports, anchor nails, arc-shaped heat preservation bricks, and stainless steel inner liner plates; several layers of the radiant heat dissipation pipe supports are spaced apart along the axial direction on the inner wall of the rotary kiln cylinder, each layer comprising multiple radiant heat dissipation pipe supports spaced apart along the circumferential direction, with adjacent layers of radiant heat dissipation pipe supports staggered along the axial direction; several layers of anchor nails are also spaced apart along the axial direction on the inner wall of the rotary kiln cylinder, each layer comprising multiple anchor nails evenly spaced apart along the circumferential direction, wherein each anchor nail... The fixed nails are all fitted with the arc-shaped heat-insulating bricks, which are spliced ​​and laid all over the inner wall of the rotary kiln. The ends of each of the radiant heat-dissipating pipe supports protrude from the arc-shaped heat-insulating bricks and are placed inside the rotary kiln. The joints between each radiant heat-dissipating pipe support and the corresponding arc-shaped heat-insulating brick, as well as the joints between two adjacent arc-shaped heat-insulating bricks, are filled with castable refractory. Each of the radiant heat-dissipating pipe supports is fitted with a stainless steel inner liner, which is pressed and spliced ​​onto the surface of the arc-shaped heat-insulating bricks. The gaps between two adjacent stainless steel inner liners are connected by laying strips.

[0006] Preferably, the radiant heat dissipation pipe support is a finger-shaped plate arranged radially on the plate surface. Each finger-shaped plate in each layer is located on the same plane. The first arc-shaped end of each finger-shaped plate points to the central axis of the rotary kiln body, and the second arc-shaped end of each finger-shaped plate is welded and fixed to the inner wall of the rotary kiln body. Multiple reserved holes are opened through the plate surface of each finger-shaped plate.

[0007] Preferably, the arc-shaped insulating brick is an Al2O3·SiO2 insulating brick, with a through hole penetrating the arc surface of the arc-shaped insulating brick. The arc-shaped insulating brick is fitted onto the anchoring nail through the through hole, and the end of the vertical section of the anchoring nail is placed inside the through hole.

[0008] Preferably, the anchoring pins are L-shaped, with the horizontal sections of each anchoring pin welded to the inner wall of the rotary kiln cylinder, and the vertical sections of each anchoring pin being perpendicular to the inner wall of the rotary kiln cylinder.

[0009] Preferably, within the rotary kiln shell, pulverized coal flows counterclockwise from the kiln head to the kiln tail. The gaps formed between adjacent stainless steel inner liner plates include axial gaps and circumferential gaps. The axial gaps are arranged along the axial direction of the rotary kiln shell, and the circumferential gaps are arranged along the circumference of the rotary kiln shell.

[0010] Preferably, each of the pressure strips is respectively disposed in the axial seam and the circumferential seam, one side of each pressure strip is welded and fixed to the corresponding stainless steel inner liner, and the other side of each pressure strip is pressed against the adjacent stainless steel inner liner.

[0011] Preferably, the stainless steel inner liner is made of 304 stainless steel.

[0012] The advantages of this utility model are as follows: First, this utility model fixes the insulation layer formed by the arc-shaped insulation bricks with anchoring nails and stainless steel inner liner plates. During the rotation of the pulverized coal pyrolysis rotary kiln, the arc-shaped insulation bricks are fixed to the inner wall of the rotary kiln cylinder, eliminating friction and shaking, making them less prone to damage and detachment. Compared with the traditional internal insulation method, it reduces the kiln drying step, shortens the construction period, reduces the risk of major overhaul of the pulverized coal pyrolysis rotary kiln due to insulation layer detachment, and extends the operating time of the pulverized coal pyrolysis rotary kiln.

[0013] Secondly, the axial and circumferential seams do not restrict the thermal expansion and contraction of the stainless steel inner liner, thus preventing deformation of the stainless steel inner liner due to thermal expansion and contraction before and after production in the pulverized coal pyrolysis rotary kiln and extending its service life. The axial and circumferential seams are filled with pressure strips, and the pressing direction of the pressure strips is consistent with the movement direction of the pulverized coal in the pulverized coal pyrolysis rotary kiln, preventing pulverized coal from entering the stainless steel inner liner. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0016] Figure 2 is a schematic diagram of the structure of this utility model with a radiant heat dissipation tube installed.

[0017] Figure 3 is a partial schematic diagram of the axial section of this utility model.

[0018] Figure 4 is a schematic diagram of the structure of the radiant heat dissipation pipe support.

[0019] Figure 5 is a schematic diagram of the anchor bolt structure.

[0020] Figure 6 is a schematic diagram of the structure of the arc-shaped thermal insulation brick.

[0021] Figure 7 is a front view of Figure 6.

[0022] Figure 8 is a partial view of the stainless steel inner liner inside the rotary kiln.

[0023] The components in the attached diagram are labeled as follows: 1. Rotary kiln body; 2. Radiant heat dissipation pipe support; 2. First arc-shaped end; 2.1. Second arc-shaped end; 2.2. Reserved hole; 2.3. Anchor nail; 3. Horizontal section; 3.1. Vertical section; 3.2. Arc-shaped insulation brick; 4. Through hole; 4.1. Stainless steel inner liner; 5. Castable refractory; 6. Pressure strip; 7. Axial joint; 8. Circumferential joint; 9. Radiant heat dissipation pipe; 10. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] As shown in Figures 1-8, a heat preservation structure for a pulverized coal pyrolysis rotary kiln includes a radiant heat dissipation tube support 2, anchor nails 3, arc-shaped heat preservation bricks 4, and stainless steel inner liner 5. Several layers of radiant heat dissipation tube supports 2 are evenly spaced along the axial direction on the inner wall of the rotary kiln cylinder 1. Each layer includes multiple radiant heat dissipation tube supports 2 evenly distributed along the circumference. The radiant heat dissipation tube supports 2 of adjacent layers are staggered along the axial direction.

[0027] The radiant heat dissipation tube support 2 consists of finger-shaped plates arranged radially on the plate surface. Each finger-shaped plate in each layer is located on the same plane. The first arc-shaped end 2.1 of each finger-shaped plate points to the central axis of the rotary kiln body 1, and the second arc-shaped end 2.2 of each finger-shaped plate is welded and fixed to the inner wall of the rotary kiln body 1. Multiple reserved holes 2.3 are opened through the plate surface of each finger-shaped plate. The finger-shaped plates facilitate the opening of multiple reserved holes 2.3, thereby fixing multiple radiant heat dissipation tubes 10, enhancing the pyrolysis effect, and improving the pyrolysis efficiency. The radiant heat dissipation tubes 10 are inserted into the reserved holes 2.3, and there is a 1-2 cm gap between the reserved holes 2.3 and the outer wall of the radiant heat dissipation tubes to facilitate the thermal expansion and contraction of the radiant heat dissipation tubes 10.

[0028] On the inner wall of the rotary kiln body 1, several layers of anchor nails 3 are evenly arranged along the axial direction. Each layer includes multiple anchor nails 3 evenly arranged along the circumference. The anchor nails 3 of each layer are arranged correspondingly upward along the axial direction. The anchor nails 3 are L-shaped. The horizontal section 3.1 of each anchor nail 3 is welded to the inner wall of the rotary kiln body 1, and the vertical section 3.2 of each anchor nail 3 is perpendicular to the inner wall of the rotary kiln body 1.

[0029] An arc-shaped insulating brick 4 is fitted onto the vertical section 3.2 of each anchor nail 3. The arc-shaped insulating brick 4 is installed through the anchor nail 3 to form an insulation layer, reducing the risk of the insulation layer falling off. The arc-shaped insulating brick 4 is made of Al2O3·SiO2 insulating brick, which has the advantages of high temperature resistance and strong insulation effect. There is a through hole 4.1 through the arc surface of the arc-shaped insulating brick 4. The arc-shaped insulating brick 4 is fitted onto the anchor nail 3 through the through hole 4.1. The arc-shaped insulating brick 4 is spliced ​​and laid to cover the entire surface. The vertical section 3.2 of the anchor nail 3 is placed inside the through hole 4.1 on the inner wall of the kiln body 1; and the ends of each radiant heat dissipation pipe support 2 are inserted through the arc-shaped insulation brick 4 and placed inside the rotary kiln body 1; the joints between each radiant heat dissipation pipe support 2 and the corresponding arc-shaped insulation brick 4, as well as the joints between two adjacent arc-shaped insulation bricks 4, are filled with castable 6. By filling with castable 6, it is ensured that there are no voids in the insulation layer, thereby reducing the damage of heat to the inner wall of the rotary kiln body 1.

[0030] Each radiant heat dissipation pipe support 2 is fitted with a stainless steel inner liner 5. The stainless steel inner liner 5 is made of 304 stainless steel. Each stainless steel inner liner 5 is pressed and spliced ​​on the surface of the arc-shaped insulation brick 4. 304 stainless steel has the advantages of high temperature resistance and high toughness. By pressing the arc-shaped insulation brick 4 with the stainless steel inner liner 5, the insulation layer can be prevented from falling off.

[0031] Inside the rotary kiln shell 1, pulverized coal flows counterclockwise from the kiln head to the kiln tail. The gaps formed between adjacent stainless steel inner liner plates 5 include axial gaps 8 and circumferential gaps 9. The width of axial gaps 8 and circumferential gaps 9 is 3cm. Axial gaps 8 are arranged along the axial direction of the rotary kiln shell 1, and circumferential gaps 9 are arranged along the circumference of the rotary kiln shell 1. Setting axial gaps 8 and circumferential gaps 9 will not restrict the thermal expansion and contraction of stainless steel inner liner plates 5, and can prevent the stainless steel inner liner plates 5 from deforming due to thermal expansion and contraction before and after the production of pulverized coal pyrolysis rotary kiln, thus extending their service life.

[0032] The gaps between two adjacent stainless steel inner liner plates 5 are connected by laying pressure strips 7. Each pressure strip 7 fills the axial gap 8 and the circumferential gap 9 respectively. Laying pressure strips 7 can prevent pulverized coal from entering the stainless steel inner liner plate 5 along the gaps. The specific laying method is as follows:

[0033] In the circumferential direction, the pulverized coal flows counterclockwise. When the stainless steel inner liner 5 is laid circumferentially on the arc-shaped insulation brick 4, one side of the pressure strip 7 filled in the axial gap 8 is welded and fixed to the rear stainless steel inner liner 5 (stainless steel inner liner A), and the other side presses against the adjacent front stainless steel inner liner 5 (stainless steel inner liner B).

[0034] In the axial direction, pulverized coal flows from the kiln head to the kiln tail. When the stainless steel inner liner 5 is laid axially on the arc-shaped insulation brick 4, one side of the pressure strip 7, which is filled in the circumferential joint 9, is welded and fixed to the rear stainless steel inner liner 5 (stainless steel inner liner C), and the other side presses against the adjacent front stainless steel inner liner 5 (stainless steel inner liner A and stainless steel inner liner B). When the pulverized coal flows from the kiln head to the kiln tail in a counterclockwise direction, the pressing direction of the pressure strip 7 is consistent with the movement direction of the pulverized coal in the pulverized coal pyrolysis rotary kiln, so as to prevent the pulverized coal from entering the stainless steel inner liner 5 and affecting the service life of the equipment.

[0035] Installation and usage process:

[0036] First, the radiant heat dissipation tube bracket 2 is evenly welded and fixed to the inner wall of the rotary kiln body 1. Then, the horizontal section 3.1 of the anchor nail 3 is evenly welded and fixed to the inner wall of the rotary kiln body 1.

[0037] Next, the through holes 4.1 of each prefabricated Al2O3·SiO2 arc-shaped insulation brick 4 are respectively fitted onto the vertical section 3.2 of the anchor nail 3. The arc-shaped insulation brick 4 is spliced ​​in this way. For the place where the arc-shaped insulation brick 4 contacts the radiant heat dissipation pipe support 2, it is necessary to cut and install according to the site conditions to ensure that the arc-shaped insulation brick 4 is fully covered on the inner wall of the entire rotary kiln cylinder 1 without any omissions.

[0038] Then, fill the joints between each radiant heat dissipation pipe bracket 2 and the corresponding arc-shaped insulation brick 4, as well as the joints between two adjacent arc-shaped insulation bricks 4, with castable material 6.

[0039] Then, stainless steel inner liner 5 is fitted onto each of the radiant heat dissipation pipe supports 2. The reserved hole of each stainless steel inner liner 5 is welded and fixed to the corresponding radiant heat dissipation pipe support 2. This process is repeated to press and splice each stainless steel inner liner 5 onto the surface of the arc-shaped heat insulation brick 4.

[0040] Finally, pressure strips 7 are filled and laid in the gaps between adjacent stainless steel inner liner plates 5. In the circumferential direction, the pulverized coal flows counterclockwise. When the stainless steel inner liner plates 5 are laid circumferentially on the arc-shaped insulation bricks 4, one side of the pressure strip 7 filled in the axial gap 8 is welded and fixed to the rear stainless steel inner liner plate 5 (stainless steel inner liner plate A), and the other side presses against the adjacent front stainless steel inner liner plate 5 (stainless steel inner liner plate B). In the axial direction, the pulverized coal flows from the kiln head to the kiln tail. When the stainless steel inner liner plates 5 are laid axially on the arc-shaped insulation bricks 4, one side of the pressure strip 7 filled in the circumferential gap 9 is welded and fixed to the rear stainless steel inner liner plate 5 (stainless steel inner liner plate C), and the other side presses against the adjacent front stainless steel inner liner plates 5 (stainless steel inner liner plate A and stainless steel inner liner plate B). This process is repeated to complete the installation of all pressure strips 7.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heat preservation structure for a pulverized coal pyrolysis rotary kiln, characterized in that, It includes radiant heat dissipation pipe supports, anchoring nails, arc-shaped insulating bricks, and stainless steel inner liner plates; several layers of the radiant heat dissipation pipe supports are arranged axially at intervals on the inner wall of the rotary kiln, each layer including multiple radiant heat dissipation pipe supports arranged circumferentially at intervals, and adjacent layers of radiant heat dissipation pipe supports are staggered axially; several layers of anchoring nails are also arranged axially at intervals on the inner wall of the rotary kiln, each layer including multiple anchoring nails evenly spaced circumferentially, and each anchoring nail is fitted with an arc-shaped insulating brick. The curved insulating bricks are spliced ​​and laid all over the inner wall of the rotary kiln cylinder, and the ends of each of the radiant heat dissipation pipe supports protrude from the curved insulating bricks and are placed inside the rotary kiln cylinder; the joints between each of the radiant heat dissipation pipe supports and the corresponding curved insulating bricks, as well as the joints between two adjacent curved insulating bricks, are filled with castable refractory; each of the radiant heat dissipation pipe supports is fitted with a stainless steel inner liner, and each of the stainless steel inner liners is pressed and spliced ​​on the surface of the curved insulating bricks, and the gaps between two adjacent stainless steel inner liners are connected by laying pressure strips.

2. The insulation structure for a pulverized coal pyrolysis rotary kiln according to claim 1, characterized in that, The radiant heat dissipation tube support is a finger-shaped plate arranged radially on the plate surface. Each finger-shaped plate in each layer is located on the same plane. The first arc-shaped end of each finger-shaped plate points to the central axis of the rotary kiln body, and the second arc-shaped end of each finger-shaped plate is welded and fixed to the inner wall of the rotary kiln body. Multiple reserved holes are opened through the plate surface of each finger-shaped plate.

3. The insulation structure for a pulverized coal pyrolysis rotary kiln according to claim 1, characterized in that, The arc-shaped insulating brick is made of Al2O3·SiO2 insulating brick. A through hole is formed on the arc surface of the arc-shaped insulating brick. The arc-shaped insulating brick is fitted onto the anchoring nail through the through hole, and the end of the vertical section of the anchoring nail is placed in the through hole.

4. The insulation structure for a pulverized coal pyrolysis rotary kiln according to any one of claims 1-3, characterized in that, The anchoring pins are L-shaped, with the horizontal sections of each anchoring pin welded to the inner wall of the rotary kiln cylinder, and the vertical sections of each anchoring pin set perpendicular to the inner wall of the rotary kiln cylinder.

5. The insulation structure for a pulverized coal pyrolysis rotary kiln according to claim 1, characterized in that, Inside the rotary kiln, pulverized coal flows counterclockwise from the kiln head to the kiln tail. The gaps formed between adjacent stainless steel inner liner plates include axial gaps and circumferential gaps. The axial gaps are arranged along the axial direction of the rotary kiln, and the circumferential gaps are arranged along the circumference of the rotary kiln.

6. The insulation structure for a pulverized coal pyrolysis rotary kiln according to claim 5, characterized in that, Each of the pressure strips is respectively set in the axial seam and the circumferential seam. One side of each pressure strip is welded and fixed to the corresponding stainless steel inner liner, and the other side of each pressure strip is pressed against the adjacent stainless steel inner liner.

7. The insulation structure for a pulverized coal pyrolysis rotary kiln according to claim 1, characterized in that, The stainless steel inner liner is made of 304 stainless steel.

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