Anti-falling energy-saving lining for high-temperature section of transformation kiln

Abstract

The anti-falling energy-saving lining comprises a heat insulation layer, a pouring layer and a prefabricated layer, the heat insulation layer is laid on the inner wall of the rotary kiln, the pouring layer is arranged on the upper end face, away from the inner wall of the high-temperature section of the rotary kiln, of the heat insulation layer, and the prefabricated layer is arranged on the upper end face, away from the heat insulation layer, of the pouring layer. Connecting claw nails extending into the pouring layer are arranged on the inner wall of the transformation kiln, a connecting channel is formed in the prefabricated layer, and a connecting groove hole matched with the connecting channel is formed in the pouring layer. Connecting pieces penetrate through the connecting channels and the connecting slotted holes to connect the pouring layer and the prefabricated layer into a whole; according to the scheme, thermal expansion crushing damage of the surfaces of the positioning bricks and the nesting bricks is avoided through ingenious design, material isolation is achieved by arranging the spoon-shaped boundary, and crushing of materials entering a pouring layer is avoided.

Description

Technical Field

[0001] This utility model relates to the field of transition kilns, and in particular to an energy-saving lining for the high-temperature section of a transition kiln that prevents detachment. Background Technology

[0002] As a key piece of equipment in the spodumene sulfuric acid process for producing battery-grade lithium salts, the conversion kiln, under rotating conditions, often experiences localized detachment or distortion of the refractory lining due to its large longitudinal dimensions (nearly 70m) and high internal roasting temperature (nearly 1500℃). This detachment frequently occurs in the high-temperature section of the kiln. Refractory lining detachment can be identified by cylinder scanning. Under normal circumstances, the cylinder temperature does not exceed 250℃; a temperature exceeding 300℃ with an increase indicates refractory lining detachment. Severe detachment will cause the cylinder temperature to exceed 550℃, and a temperature exceeding 350℃ necessitates kiln shutdown for inspection. Since most conversion kilns in lithium salt plants do not have backup units, refractory lining detachment will directly lead to production line shutdown. Furthermore, the structure of the refractory lining also affects the natural gas consumption of the conversion kiln. For example, after replacing the cast-in-place lining with a pure precast brick lining, natural gas consumption increased by approximately 10 Nm³ / ton of raw ore.

[0003] To address the issues of refractory lining detachment and increased energy consumption in rotary kilns under high-temperature rotation conditions, CN222012678U discloses a rotary kiln employing a combination of precast blocks and castable refractory. The refractory lining of this kiln consists of a composite precast lightweight layer and a masonry layer. The refractory lining is fixed by perforated wedge-shaped floor tiles, which are then fixed inside the cylinder by fasteners. However, the crucial floor tiles and fasteners are not described in detail; breakage of the perforated wedge-shaped floor tiles or fasteners will lead to refractory lining detachment and poor durability. CN219121068U also discloses a castable anti-detachment device. This castable refractory achieves the integrity of the refractory lining through welded anchors, positioning ribs, and reinforcing rods. The anchors are extended and protected against corrosion through an outer stress-relieving layer and a nano-coating inside the cylinder, improving the durability of the refractory lining. However, this device also suffers from complex construction, difficulty in controlling process quality, and circumferential expansion cracking.

[0004] In light of the shortcomings of existing technical solutions and specific problems in the production process, and based on fundamental theories such as mechanics and heat transfer, a new energy-saving lining for lithium ore conversion kilns is proposed to address issues such as localized detachment, distortion, and increased natural gas consumption of the refractory lining, thereby improving the economy and stable operating time of the conversion kiln. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving lining for the high-temperature section of a transition kiln that prevents detachment and addresses the above-mentioned shortcomings. This invention solves the problems of localized detachment, distortion, and increased natural gas consumption of the refractory lining in the high-temperature section of a lithium mine transition kiln.

[0006] This utility model is achieved through the following solution:

[0007] A heat-resistant and energy-saving lining for the high-temperature section of a conversion kiln includes an insulation layer, a cast-in-place layer, and a precast layer. The insulation layer is laid on the inner wall of the conversion kiln. The cast-in-place layer is located on the outer end face of the insulation layer away from the inner wall of the high-temperature section of the conversion kiln. The precast layer is located on the outer end face of the cast-in-place layer away from the insulation layer. Connecting claws extending into the cast-in-place layer are provided on the inner wall of the conversion kiln. Connecting channels are provided in the precast layer. Connecting slots that mate with the connecting channels are provided in the cast-in-place layer. The cast-in-place layer and the precast layer are connected as a whole by connecting parts passing through the connecting channels and connecting slots.

[0008] Based on the above-mentioned structure of the anti-fall-off energy-saving lining of the high-temperature section of a conversion kiln, the casting layer consists of multiple casting units, with construction joints and reinforcing claw nails provided between adjacent casting units; the bottom of the reinforcing claw nail is fixedly connected to the inner wall of the conversion kiln, and the ends of the reinforcing claw nails away from the inner wall of the conversion kiln are respectively connected to adjacent casting units, the reinforcing claw nails are set directly opposite the construction joint, and multiple reinforcing claw nails are set along the length direction of the contact point between adjacent casting units, and the construction joint is semi-embedded between adjacent casting units.

[0009] Based on the above-mentioned structure of an anti-fall-off energy-saving lining for a high-temperature section of a transition kiln, the prefabricated layer includes single-hole positioning bricks, double-hole positioning bricks, and nested bricks. The nested bricks are arranged between the single-hole positioning bricks or between the single-hole positioning bricks and the double-hole positioning bricks. Connecting grooves are provided on the contact parts of the nested bricks at both ends with the single-hole positioning bricks or the double-hole positioning bricks. The connecting grooves are located at the center of the width direction of the nested bricks. Connecting protrusions that cooperate with the connecting grooves are provided at both ends of the single-hole positioning bricks and the double-hole positioning bricks. The connecting protrusions are located at the center of the width direction of the single-hole positioning bricks and the double-hole positioning bricks.

[0010] Based on the above-mentioned structure of the high-temperature section anti-fall-off energy-saving lining of the transformation kiln, a connecting channel is set at the center of the length direction of the single-hole positioning brick, and two connecting channels are symmetrically set at the center of the length direction of the double-hole positioning brick. A connecting slot is set at the position on the casting layer that matches the connecting channels of the single-hole positioning brick and the double-hole positioning brick; one end of the connector is set in the connecting slot and the other end is set in the connecting channel.

[0011] Based on the above-mentioned structure of the high-temperature section anti-fall-off energy-saving lining of the transformation kiln, the center position of the double-hole positioning brick along its length is directly opposite the construction joint of the adjacent casting unit.

[0012] Based on the above-mentioned structure of an energy-saving lining for preventing detachment in the high-temperature section of a transition kiln, an expansion joint is provided in the upper part of the connection between the nested brick and the single-hole positioning brick and the double-hole positioning brick, and the expansion joint is provided with filler fiber and sealing mortar; the filler fiber includes round strips and fiber cloth.

[0013] Based on the above-mentioned structure of an anti-fall-off energy-saving lining for a high-temperature section of a transition kiln, the connecting component includes an anchor rod, a first nut, and a second nut; one end of the anchor rod is a threaded rod that mates with the first nut and the second nut, and the other end is an anchoring rod with a connecting spike; the threaded rod is disposed in the connecting channel, and the anchoring rod is disposed in the connecting slot.

[0014] Based on the above-mentioned structure of an anti-fall-off energy-saving lining for the high-temperature section of a transition kiln, an inorganic adhesive is provided in the connecting slot, and a sealant is provided at the end of the connecting slot on the connecting channel; a limiting groove that mates with the first nut and the second nut is provided in the connecting channel.

[0015] Based on the above-mentioned structure of an anti-fall-off energy-saving lining for the high-temperature section of a transition kiln, the thickness of the cast-in-place layer is not less than that of the precast layer.

[0016] Based on the above-mentioned structure of the high-temperature section anti-fall-off energy-saving lining of a transition kiln, the height of the connecting claw nail and the reinforcing claw nail is consistent, and both are 20-50mm lower than the upper surface of the cast layer, and the spacing of the connecting claw nail is 150-200mm.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] 1) The casting layer with low thermal conductivity and expansion coefficient in this scheme can reduce the heat loss of the precast layer to the inner wall of the converter kiln and provide buffer support for the precast layer. In addition, the connecting claw nails welded to the inner wall of the converter kiln can ensure the tightness of the connection between the casting layer and the inner wall of the converter kiln and increase the overall strength of the casting layer. The precast layer in this scheme has high mechanical strength. By setting the nested precast layer, it can prevent lithium ore erosion and scouring, and increase the durability of the converter kiln lining.

[0019] 2) The lining structure of this solution is simple, easy to construct, and has a long service life.

[0020] 3) The cleverly designed expansion joint in this scheme avoids thermal expansion and crushing damage to the surfaces of the positioning bricks and nested bricks. By setting a spoon-shaped boundary, material isolation is achieved, preventing the accumulation of material in the pouring layer from causing crushing.

[0021] 4) In this scheme, the precast layer with high mechanical properties is combined with the cast-in-place layer with good thermal insulation properties, which solves the problems of lithium ore erosion and spalling, as well as the problems of heat loss and increased natural gas consumption in the kiln. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural diagram of the entire utility model;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] The components include: 1. Insulation layer; 2. Cast-in-place layer; 3. Precast layer; 4. Inner wall of the conversion kiln; 5. Connector; 21. Connecting claw nail; 22. Connecting slot; 23. Construction joint; 24. Reinforcing claw nail; 31. Connecting channel; 32. Single-hole positioning brick; 33. Double-hole positioning brick; 34. Nested brick; 35. Connecting groove; 36. Connecting protrusion; 37. Expansion joint; 38. Joint filler fiber; 39. Sealing mortar; 51. Anchor rod; 52. First nut; 53. Second nut; 54. Limiting groove. Detailed Implementation

[0025] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0026] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., 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 component referred to must have a predetermined orientation, or be constructed and operated in a predetermined orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, this utility model provides a technical solution:

[0031] A heat-resistant and energy-saving lining for the high-temperature section of a transition kiln includes, but is not limited to, an insulation layer 1, a cast-in-place layer 2, and a precast layer 3. The insulation layer 1 is laid on the inner wall 4 of the transition kiln. The cast-in-place layer 2 is located on the outer end face of the insulation layer 1 away from the inner wall of the high-temperature section of the transition kiln. The precast layer 3 is located on the outer end face of the cast-in-place layer 2 away from the outer end face of the insulation layer 1. The inner wall 4 of the transition kiln is provided with connecting claws 21 extending into the cast-in-place layer 2. The precast layer 3 is provided with connecting channels 31. The cast-in-place layer 2 is provided with connecting slots 22 that mate with the connecting channels 31. The cast-in-place layer 2 and the precast layer 3 are connected as a whole by connecting members 5 passing through the connecting channels 31 and the connecting slots 22.

[0032] Based on the above structure, this scheme sets up a casting layer with low thermal conductivity and expansion coefficient to reduce the heat loss of the precast layer to the inner wall of the converter kiln, and also provides buffer support for the precast layer. In addition, connecting claws are set up to be welded and positioned to the inner wall of the converter kiln. On the one hand, this can ensure the tightness of the connection between the casting layer and the inner wall of the converter kiln, and on the other hand, it can increase the overall strength of the casting layer. The precast layer in this scheme has high mechanical strength. By setting up nested precast layers, it can prevent lithium ore erosion and scouring, and increase the durability of the converter kiln lining.

[0033] As an example, the thickness of the cast-in-place layer 2 is not less than that of the precast layer 3.

[0034] Based on the above structure, in order to reduce the risk of detachment caused by the self-weight of the precast layer, the casting layer can be thicker because of the claw nails. Therefore, the thickness of the casting layer 2 needs to be greater than the thickness of the precast layer 3. The advantages of this structure are: the thicker casting layer 2 has higher heat insulation performance, which can reduce heat loss in the kiln and save natural gas consumption; the thinner precast layer 3 has higher mechanical strength, which can prevent lithium ore erosion and scouring, and increase the durability of the conversion kiln lining. At the same time, the overall thickness of both is not too thick to affect the roasting capacity of the ore.

[0035] As an example, the casting layer 2 can be multiple casting units, with construction joints 23 and reinforcing claw nails 24 provided between adjacent casting units; the bottom of the reinforcing claw nails 24 is fixedly connected to the inner wall 4 of the transformation kiln, and the ends of the reinforcing claw nails 24 away from the inner wall 4 of the transformation kiln are respectively connected to the adjacent casting units, the reinforcing claw nails 24 are set facing the construction joints 23, and multiple reinforcing claw nails 24 are set along the length direction of the contact point between adjacent casting units, and the construction joints 23 are embedded between adjacent casting units.

[0036] Based on the above structure, by setting construction joints 23 between adjacent casting units, space is reserved for the heat deformation of the later casting units. At the same time, multiple reinforcing claw nails 24 are set at the construction joints 23 to increase the connection strength of adjacent casting units, making the entire casting layer 2 structure connected by casting units more stable and with better heat resistance.

[0037] As an example, the prefabricated layer 3 is a spliced ​​structure. The prefabricated layer 3 may include single-hole positioning bricks 32, double-hole positioning bricks 33 and nested bricks 34. The nested bricks 34 are disposed between the single-hole positioning bricks 32 or between the single-hole positioning bricks 34 and the double-hole positioning bricks 33. The two ends of the nested bricks 34 are provided with connecting grooves 35 on the contact parts with the single-hole positioning bricks 32 or the double-hole positioning bricks 33. The connecting grooves 35 are located at the center position in the width direction of the nested bricks 34. The two ends of the single-hole positioning bricks 32 and the double-hole positioning bricks 33 are respectively provided with connecting protrusions 36 that cooperate with the connecting grooves 35. The connecting protrusions 36 are located at the center position in the width direction of the single-hole positioning bricks 32 and the double-hole positioning bricks 33.

[0038] A connecting channel 31 is provided at the center of the length direction of the single-hole positioning brick 32, and two connecting channels 31 are symmetrically provided at the center of the length direction of the double-hole positioning brick 33. A connecting slot 22 is provided on the casting layer 2 at the position that matches the connecting channels 31 of the single-hole positioning brick 32 and the double-hole positioning brick 33. One end of the connector 5 is set in the connecting slot, and the other end is set in the connecting channel 31.

[0039] The center of the double-hole positioning brick 33 along its length is directly opposite the construction joint 23 of the adjacent casting unit.

[0040] Based on the above structure, by setting the precast layer 3 as a splicing structure, the assembly of the precast layer 3 can be quickly realized. Simultaneously, connecting grooves 35 are provided on both sides of the nested brick 34, and connecting protrusions 36 are provided at both ends of the single-hole positioning brick 32 and the double-hole positioning brick 33. This serves two purposes: firstly, it provides guidance, reducing assembly difficulty; secondly, it allows the assembled bricks to have a self-limiting function, preventing relative slippage and assembly errors, and also achieves material isolation to prevent material from accumulating and crushing the poured layer 2. Furthermore, by aligning the center position of the double-hole positioning brick 33 along its length with the construction joint 23 of the adjacent poured unit, the construction joint 23 and the connection points of the nested brick 34 in the precast layer 3 with the single-hole positioning brick 32 and the double-hole positioning brick 33 are staggered, further preventing material from entering the construction joint 23 of the poured layer 2.

[0041] As an example, an expansion joint 37 is provided in the upper part of the connection between the nested brick 34 and the single-hole positioning brick 32 and the double-hole positioning brick 33, respectively. The expansion joint 37 is provided with grouting fiber 38 and sealing putty 39; the grouting fiber 38 includes round strips and fiber cloth.

[0042] Based on the above structure, the ends of the expansion joint 37 are sealed with sealing mortar 39, so that the entire prefabrication is integrated. At the same time, the expansion joint 37 is filled with filling fiber 38, which can make the interior of the expansion joint 37 more compact and increase the strength of the splice of the prefabricated layer 3. The expansion joint 37 avoids the thermal expansion and crushing cracking and falling off of the prefabricated layer 3 and the cast layer 2.

[0043] As an example, the connector 5 may include an anchor rod 51, a first nut 52 and a second nut 53; one end of the anchor rod 51 is a threaded rod that mates with the first nut 52 and the second nut 53, and the other end is an anchoring rod with a connecting spike; the threaded rod is disposed in the connecting channel 31, and the anchoring rod is disposed in the connecting slot 22.

[0044] Inorganic adhesive is provided in the connecting slot 22, and sealant is provided at the end of the connecting slot 22 on the connecting channel 31; a limiting groove 54 is provided in the connecting channel 31 to cooperate with the first nut 52 and the second nut 53.

[0045] Based on the above structure, the anchor rod is fixed in the connecting slot 22 by cooperating with the inorganic adhesive. At the same time, the first nut 52 and the second nut 53 on the threaded rod cooperate with the limiting slot 54 to connect the connector 5 with the single-hole positioning brick 32 and the double-hole positioning brick 33. Finally, the precast layer 3 and the cast layer 2 are connected into a whole by the connector 5.

[0046] As an example, the heights of the connecting claw studs 21 and the reinforcing claw studs 24 are consistent, and both are 20-50 mm below the upper surface of the cast layer 2. The spacing of the connecting claw studs 21 is 150-200 mm.

[0047] Based on the above structure, by specially setting the height of the connecting claw nail 21 and the reinforcing claw nail 24, the connection strength with the casting can be guaranteed. At the same time, by specially setting the spacing of the connecting claw nail 21, the circumferential spacing ensures that there is at least one connecting claw nail in the corresponding casting layer 2 under each precast brick, thereby ensuring the support strength.

[0048] Example 2

[0049] This utility model provides a technical solution:

[0050] A construction method for an energy-saving lining to prevent detachment in the high-temperature section of a transition kiln includes the following steps:

[0051] Step 1: Preliminary preparations, including cleaning up the original old structure, dividing the construction area according to regulations, and marking lines within the construction area.

[0052] Specifically, the old nails and refractory material on the inner wall 4 of the transformation kiln are cleaned up. The lining layer 2 of the high-temperature section of the transformation kiln is divided into a ring according to the length of two bricks along the axis (a ring is formed by interlocking single-hole positioning bricks 32, double-hole positioning bricks 33 and nested bricks 34, and two parallel rings constitute a ring). Each ring is divided into three construction areas (the central angle of each construction area is 120°). Lines are drawn at the adjacent construction areas to distinguish the construction scope. A straight line parallel to the center line of the transformation kiln is drawn in the middle of each construction area as a positioning line. The construction joints 23 of the lining layer 2 of the adjacent two rings are staggered and reserved by 2mm.

[0053] The thickness difference between the cast-in-place layer 2 and the precast layer 3 is determined based on the thermal insulation design performance of the lining. The height of the clamping nail is selected based on the thickness of the cast-in-place layer 2, and the clamping nail height is 20-50mm lower than the thickness of the cast-in-place layer 2.

[0054] Step 2: Start the conversion kiln and rotate the positioning line of the first construction area to the lowest point. Set the spacing of the connecting claw nails to 150-200mm. The axial spacing of the reinforcing claw nails at the construction joint 23 of the pouring layer 2 should be increased by 1-2 times according to the thickness of the pouring layer 2. Mark the welding positions of the circumferential connecting claw nails and reinforcing claw nails 24.

[0055] Step 3: Lay the insulation layer 1, represented by the nano-insulation board, on the inner wall 4 of the transformation kiln, and make slits at the marked positions of the claw nails. Weld the connecting claw nails or reinforcing claw nails 24 to the inner wall 4 of the transformation kiln, and check the welding quality to ensure that the full welding standard is met.

[0056] Step 4: After the welding of the grab nails in the first circumferential construction area is completed, the grab nails in the second and third circumferential construction areas are continuously welded before pouring the second layer of concrete.

[0057] Step 5: Install the formwork system and set up 2-3mm wide construction joints 23 (non-through joints, only leaving 2-3mm * 50mm gaps on the surface) at the junction of adjacent construction areas. Adjust the bolts on the formwork to control the shape of the slurry blocks, measure the deviation, and finally fix it.

[0058] Step Six: Inject castable refractory (the aggregate of which is corundum mullite castable or silicon carbide-based castable) upwards and outwards through the grouting holes at the bottom of the template system until the first ring is filled and formed. The construction joints 23 of each ring of the casting layer 2 are staggered. After 24 hours, remove the template and the embedded parts of the construction joints 23 of the casting layer 2, and inject joint filler into the construction joints 23 of the casting layer 2. The pre-reserved positioning holes can be cured to 80% of the design strength before the precast layer 3 can be constructed.

[0059] Step 7: First, install a single-hole positioning brick 32 at the bottom positioning line position of the first construction area: According to the position of the positioning brick, drill a connecting groove 22 on the pouring layer 2. The depth of the connecting groove 22 is generally 2 / 3 of the thickness of the pouring layer 2, and the diameter of the connecting groove 22 is generally about 50% larger than the diameter of the anchor rod 51 (to ensure the anchoring strength while reducing the heat transfer of the precast layer 3 to the inner wall 4 of the transformation kiln through the connecting sleeve). First, fill the connecting groove 22 with inorganic adhesive, and then insert the anchor rod 51. After the adhesive solidifies, install the other end of the threaded rod in the connecting through hole of the single-hole positioning brick 32.

[0060] Step 8: The diameter of the connecting through hole of the single-hole positioning brick 32 or the double-hole positioning brick 33 is 2mm larger than that of the threaded rod to ensure that the single-hole positioning brick 32 or the double-hole positioning brick does not wobble. First, fill the connecting through hole with putty, then put it on the connecting sleeve and tighten the double nuts to fix it, and fill it with dense sealant.

[0061] Step Nine: After the single-hole positioning brick 32 of the positioning line is fixed in place, install the nesting brick 34 and the single-hole positioning brick 32 symmetrically on both sides, and install the last two double-hole positioning bricks 33 on both sides at the end of the first construction area; when installing the positioning brick and the nesting brick 34, first apply the joint filler mortar to the expansion joint 37 of the precast layer 3, then set the joint filler fiber 38, and then press the two bricks tightly to achieve the compactness of the expansion joint 37 of the precast layer 3; there may be gaps between the precast layer 3 and the cast layer 2. When installing the precast layer 3, first set PA-80 adhesive-bonded refractory concrete to level the position of the cast layer 2.

[0062] Step 10: Start the transformation kiln and rotate the positioning lines of the second and third construction areas to the bottom of the transformation kiln. Repeat steps 7 to 9 to complete the construction of the precast layer 3 in the second and third construction areas.

[0063] Step 11: Repeat steps 1-10 along the axis of the transition kiln to complete the construction of the high-temperature section lining of the transition kiln, which is convenient and quick. (The positioning bricks and nesting bricks 34 of the precast layer 3 in the high-temperature section can be made of high-density phosphate bricks or chrome corundum bricks).

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drop-off prevention energy-saving lining for high-temperature section of a transformation kiln, characterized in that: The system includes an insulation layer, a cast-in-place layer, and a precast layer. The insulation layer is laid on the inner wall of the converter kiln. The cast-in-place layer is located on the outer end face of the insulation layer away from the high-temperature section of the converter kiln's inner wall. The precast layer is located on the outer end face of the cast-in-place layer away from the insulation layer. Connecting claws extending into the cast-in-place layer are provided on the inner wall of the converter kiln. Connecting channels are provided in the precast layer. Connecting slots that mate with the connecting channels are provided in the cast-in-place layer. The cast-in-place layer and the precast layer are connected as a whole by connecting parts passing through the connecting channels and connecting slots. ​ 2. The energy-saving anti-falling lining for high-temperature section of a transformation kiln according to claim 1, characterized in that: The casting layer consists of multiple casting units, with construction joints and reinforcing claw nails provided between adjacent casting units. The bottom of the reinforcing claw nail is fixedly connected to the inner wall of the transformation kiln, and the ends of the reinforcing claw nails away from the inner wall of the transformation kiln are respectively connected to adjacent casting units. The reinforcing claw nails are set directly opposite the construction joints, and multiple reinforcing claw nails are set along the length direction of the contact point between adjacent casting units. The construction joints are semi-embedded between adjacent casting units.

3. The anti-falling energy-saving lining for high-temperature section of a transformation kiln according to claim 2, characterized in that: The precast layer includes single-hole positioning bricks, double-hole positioning bricks, and nested bricks. The nested bricks are disposed between single-hole positioning bricks or between single-hole positioning bricks and double-hole positioning bricks. Connecting grooves are provided on the contact parts of the nested bricks at both ends with the single-hole positioning bricks or double-hole positioning bricks. The connecting grooves are located at the center of the width direction of the nested bricks. Connecting protrusions that cooperate with the connecting grooves are provided at both ends of the single-hole positioning bricks and double-hole positioning bricks. The connecting protrusions are located at the center of the width direction of the single-hole positioning bricks and double-hole positioning bricks.

4. The anti-falling energy-saving lining for high-temperature section of a transformation kiln according to claim 3, characterized in that: A connecting channel is provided at the center of the length direction of the single-hole positioning brick, and two connecting channels are symmetrically provided at the center of the length direction of the double-hole positioning brick. A connecting slot is provided on the casting layer at the position that matches the connecting channels of the single-hole positioning brick and the double-hole positioning brick. One end of the connector is set in the connecting slot and the other end is set in the connecting channel.

5. The anti-falling energy-saving lining for high-temperature section of a transformation kiln according to claim 4, characterized in that: The center of the double-hole positioning brick along its length is directly opposite the construction joint of the adjacent casting unit.

6. The energy-saving anti-falling lining for high-temperature section of a transformation kiln according to claim 5, characterized in that: An expansion joint is provided at the upper part of the connection between the nested brick and the single-hole positioning brick and the double-hole positioning brick, respectively. The expansion joint is provided with joint filling fiber and joint sealing putty; the joint filling fiber includes round strips and fiber cloth.

7. The energy-saving anti-falling lining for high-temperature section of a transformation kiln according to claim 6, characterized in that: The connector includes an anchor rod, a first nut, and a second nut; one end of the anchor rod is a threaded rod that mates with the first nut and the second nut, and the other end is an anchoring rod with a connecting spike; the threaded rod is disposed in the connecting channel, and the anchoring rod is disposed in the connecting slot.

8. The energy-saving anti-falling lining for high-temperature section of a transformation kiln according to claim 7, characterized in that: Inorganic adhesive is provided in the connecting slot, and sealant is provided at the end of the connecting slot on the connecting channel; a limiting groove is provided in the connecting channel to cooperate with the first nut and the second nut.

9. The energy-saving anti-falling lining for high-temperature section of a transformation kiln according to claim 8, characterized in that: The thickness of the cast-in-place layer shall not be less than that of the precast layer.

10. The energy-saving anti-falling lining for high-temperature section of a transformation kiln according to claim 9, characterized in that: The height of the connecting claw studs and the reinforcing claw studs is consistent, and both are 20-50mm below the upper surface of the cast layer. The spacing between the connecting claw studs is 150-200mm.

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