Lining structure of lime kiln

Abstract

The lime kiln lining structure comprises a kiln top lining and a kiln body lining, and the kiln body lining comprises a first refractory brick layer, a second refractory brick layer, a first heat insulation layer, a second heat insulation layer and a third heat insulation layer which are sequentially arranged from inside to outside. Contact surfaces between two adjacent bricks in the first refractory brick layer are in concave-convex fit and are in sealed connection; the strength of the kiln top lining is higher than that of the first refractory brick layer, the second refractory brick layer, the first heat insulation layer, the second heat insulation layer and the third heat insulation layer, and the kiln top lining extends downwards to form a reinforcing part; kiln protecting plates are arranged on the inner side face of the kiln top lining and the upper side surface of the side, away from the second refractory brick layer, of the first refractory brick layer. The stability of the lime kiln lining can be enhanced, and the service life of the lime kiln can be prolonged; meanwhile, the heat preservation performance of the lime kiln can be enhanced, and heat loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lime kilns, in particular to a lime kiln lining structure. Background Art

[0002] Calcining limestone to produce CO2 and quicklime is a key process in the production of soda ash using the ammonia-soda process. Limestone calcination significantly impacts the entire soda ash production process, accounting for approximately 25% of the total comparable energy consumption per ton of soda ash. Therefore, the structure of the lime kiln has a significant impact on CO2 concentration, ash milk quality, and energy consumption. To improve lime kiln production efficiency and reduce energy consumption, the lime kiln structure has been optimized.

[0003] A vertical lime kiln can be divided into three stages: preheating, calcining, and cooling. The calcining stage can reach temperatures of 1200°C or even higher. The stability, refractory properties, thermal insulation, and heat preservation of the kiln's internal structure directly determine the kiln's lifespan, production efficiency, and energy consumption. Existing lime kilns consist of a kiln wall and a lining structure. The lining structure, from the inside out, consists of a first refractory brick layer, a second refractory brick layer, a first thermal insulation layer, and a second thermal insulation layer. The first and second refractory brick layers are typically high-alumina LZ-75 or LZ-65 bricks. The first insulation layer is typically high-alumina polylight bricks or calcium silicate insulation board, while the second insulation layer is refractory fiber felt.

[0004] However, the existing lime kiln lining structure has the following defects: (1) The lateral contact surface between the bricks of the innermost lining of the lime kiln (i.e., the first refractory brick layer) is linear. However, during the operation of the lime kiln, the inner lining is often loosened and damaged due to the falling of the adsorption chute, which causes the lining of other layers to fall off. The lime kiln shell also burns red and deforms due to the lack of lining protection, so the kiln has to be stopped and the entire lining replaced; (2) The part near the kiln top is easily worn and falls off due to the impact of limestone and coal entering the lime kiln on the kiln wall; (3) The temperature of the outer surface of the lime kiln is usually affected by the internal calcination process, and the thermal insulation efficiency of the lime kiln needs to be improved. Utility Model Content

[0005] The purpose of the utility model is to provide a lime kiln lining structure, which can enhance the stability of the lime kiln lining and extend the service life of the lime kiln; at the same time, it can enhance the thermal insulation performance of the lime kiln and reduce heat loss.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A lime kiln lining structure comprises a kiln roof lining and a kiln body lining, the kiln roof lining is arranged at the top inner side of the cylinder of the lime kiln, the kiln body lining is arranged at the inner side of the cylinder of the lime kiln, the kiln body lining comprises a first refractory brick layer, a second refractory brick layer, a first thermal insulation layer, a second thermal insulation layer and a third thermal insulation layer arranged in sequence from the inside to the outside, the contact surfaces between two adjacent bricks in the first refractory brick layer are concave-convex matched and sealed; the strength of the kiln roof lining is higher than that of the first refractory brick layer, the second refractory brick layer, the first thermal insulation layer, the second thermal insulation layer and the third thermal insulation layer, the kiln roof lining extends downward to form a reinforcement portion, the reinforcement portion is arranged between the first refractory brick layer and the first thermal insulation layer, and the bottom of the reinforcement portion is connected to the second refractory brick layer; the inner side surface of the kiln roof lining and the upper surface of the first refractory brick layer away from the second refractory brick layer are both provided with kiln protection plates.

[0008] As a preferred solution of the present invention, any brick in the first refractory brick layer is provided with a semicircular protrusion, and the other brick corresponding thereto is provided with a semicircular groove.

[0009] As a preferred solution of the present invention, the height of the kiln roof lining is 2.1 meters; the height of the reinforcement part is 1.9 meters.

[0010] As a preferred embodiment of the present invention, it also includes a kiln door sealed by high-alumina bricks, the outer surface of the kiln door is covered with calcium silicate refractory fiber felt, the outer surface of the calcium silicate refractory fiber is provided with a steel plate, and the steel plate is fixedly connected to the cylinder of the lime kiln by screws.

[0011] As a preferred solution of the present invention, the first refractory brick layer is high-alumina brick LZ-75.

[0012] As a preferred solution of the present invention, the second refractory brick layer is made of high-alumina brick LZ-65.

[0013] As a preferred embodiment of the present invention, the first thermal insulation layer is composed of high-aluminum polylight bricks and calcium silicate insulation boards from bottom to top; the high-aluminum polylight bricks are arranged in an area 8 meters above the bottom of the lime kiln, and the calcium silicate insulation boards are arranged in an area from 8 meters to 23.3 meters above the bottom of the lime kiln.

[0014] As a preferred solution of the present invention, the second thermal insulation layer is a zirconium fiberboard.

[0015] As a preferred solution of the present invention, the third thermal insulation layer is an aluminum foil board.

[0016] As a preferred solution of the present invention, the kiln protection plate is made of alloy material.

[0017] The lime kiln lining structure provided by the present invention has the following beneficial effects compared with the prior art:

[0018] (1) The contact surfaces between two adjacent bricks in the first refractory brick layer are concave and convex, and the contact surfaces are sealed by aluminum refractory cement, which has good sealing performance and can reduce heat loss. Compared with the previous linear contact surface, it is beneficial to increase the friction between each kiln lining, and the gap connection is tighter, which reduces the loosening and damage of the kiln lining due to the falling of the adsorption chute during the operation of the lime kiln, thereby improving the integrity rate of the kiln lining and extending the life of the lime kiln.

[0019] (2) The kiln roof lining is provided with two layers of steel plates arranged 0.5 meters apart, and high-aluminum refractory cement and perlite casting material are filled between the two layers of steel plates. The kiln roof lining and the reinforcement are made of the same material, and it is preferred to use a mixture of high-aluminum refractory cement and perlite casting material instead of high-aluminum bricks, and the strength is greater than the strength of the first refractory brick layer, the second refractory brick layer, the first thermal insulation layer, the second thermal insulation layer, and the third thermal insulation layer. With this design, the hot gas temperature rising from the kiln in the area corresponding to the kiln roof lining is preheated from the kiln. The temperature of the limestone and lump coal entering the kiln roof lining gradually decreases to about 140°C when the kiln roof lining gas exits. Using a mixture of high-alumina refractory cement and perlite castables can meet the thermal insulation requirements while saving construction costs. At the same time, a reinforcement extends downward from the kiln roof lining. The reinforcement is set between the first refractory brick layer and the first thermal insulation layer, and the bottom of the reinforcement is connected to the second refractory brick layer. This not only provides thermal insulation but also solves the problem of other bricks above falling off due to the impact of materials on the high-alumina bricks. In addition, kiln guard plates are provided on the inner side of the kiln roof lining and on the upper surface of the first refractory brick layer away from the second refractory brick layer, which can effectively reduce the direct impact of materials entering the kiln body.

[0020] (3) The second thermal insulation layer is a zirconium fiber board and the third thermal insulation layer is an aluminum foil board, which have good thermal insulation effects and reduce heat loss in the lime kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments are briefly introduced below.

[0022] Figure 1 This is a structural diagram of a lime kiln lining structure provided by an embodiment of the present utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the first refractory brick layer.

[0024] Markings in the figure:

[0025] 1. Cylinder; 2. First refractory brick layer; 21. Bricks; 21a. Semicircular protrusion; 21b. Semicircular groove; 3. Second refractory brick layer; 4. First thermal insulation layer; 41. High-alumina polylight brick; 42. Calcium silicate insulation board; 5. Second thermal insulation layer; 6. Third thermal insulation layer; 7. Kiln roof lining; 8. Reinforcement; 9. Kiln guard plate; 10. Kiln door. DETAILED DESCRIPTION

[0026] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0028] See also Figures 1 to 2 The preferred embodiment of the present invention provides a lime kiln lining structure, which includes a kiln roof lining 7 and a kiln body lining, wherein the kiln roof lining 7 is arranged on the top of the inner side of the cylinder 1 of the lime kiln, and the kiln body lining is arranged on the inner side of the cylinder 1 of the lime kiln. The kiln body lining includes a first refractory brick layer 2, a second refractory brick layer 3, a first thermal insulation layer 4, a second thermal insulation layer 5 and a third thermal insulation layer 6 arranged in sequence from the inside to the outside, and the contact surface between two adjacent bricks 21 in the first refractory brick layer 2 is concave-convex matched and sealed; the kiln roof lining The strength of the lining 7 is higher than the strength of the first refractory brick layer 2, the second refractory brick layer 3, the first thermal insulation layer 4, the second thermal insulation layer 5 and the third thermal insulation layer 6. The kiln roof lining 7 extends downward to form a reinforcement portion 8. The reinforcement portion 8 is arranged between the first refractory brick layer 2 and the first thermal insulation layer 4. The bottom of the reinforcement portion 8 is connected to the second refractory brick layer 3. The inner side surface of the kiln roof lining 7 and the upper surface of the first refractory brick layer 2 away from the second refractory brick layer 3 are both provided with a kiln protection plate 9. Among them, the height of the kiln roof lining 7 is 2.1 meters; the height of the reinforcement portion 8 is 1.9 meters; as Figure 2As shown, any brick 21 of the first refractory brick layer 2 is provided with a semicircular protrusion 21a, and the other corresponding brick 21 is provided with a semicircular groove 21b.

[0029] According to the lime kiln lining structure of this embodiment, the contact surfaces between two adjacent bricks 21 in the first refractory brick layer 2 are concave and convex, and the contact surfaces are sealed by aluminum refractory cement, which has good sealing performance and can reduce heat loss. Compared with the previous linear contact surface, it is beneficial to increase the friction between each kiln lining, and the gap connection is tighter, which reduces the loosening and damage of the kiln lining due to the falling of the adsorption chute during the operation of the lime kiln, thereby improving the kiln lining integrity rate and extending the life of the lime kiln. Secondly, the kiln roof lining 7 is provided with two layers of steel plates arranged 0.5 meters apart, and high-aluminum refractory cement and perlite casting material are filled between the two layers of steel plates. The kiln roof lining 7 is made of the same material as the reinforcement part. It is preferred that a mixture of high-aluminum refractory cement and perlite casting material be used instead of high-aluminum bricks, and the strength is greater than the strength of the first refractory brick layer 2, the second refractory brick layer 3, the first thermal insulation layer 4, the second thermal insulation layer 5 and the third thermal insulation layer 6. With this design, the hot gas temperature rising from the kiln in the area corresponding to the kiln roof lining 7 is preheated from the kiln. The temperature of the limestone and lump coal entering the kiln through the top lining 7 gradually decreases until the outlet temperature of the kiln top lining 7 reaches about 140°C. The use of a mixture of high-alumina refractory cement and perlite castables can meet the thermal insulation requirements while saving construction costs. At the same time, the reinforcement 8 extends downward from the kiln top lining 7. The reinforcement 8 is arranged between the first refractory brick layer 2 and the first thermal insulation layer 4. The bottom of the reinforcement 8 is connected to the second refractory brick layer 3. This can not only insulate and preserve heat, but also solve the problem of other bricks above falling off due to the impact of materials on the high-alumina bricks. In addition, the inner side of the kiln top lining 7 and the upper surface of the first refractory brick layer 2 away from the second refractory brick layer 3 are both provided with kiln protection plates 9, which can effectively reduce the direct impact of materials entering the kiln body. It can be seen that the utility model can enhance the stability of the lime kiln lining and extend the service life of the lime kiln. At the same time, it can enhance the thermal insulation performance of the lime kiln and reduce heat loss.

[0030] For example, the lime kiln lining structure of the present invention also includes a kiln door 10 enclosed by high-alumina bricks. The outer surface of the kiln door 10 is covered with calcium silicate refractory fiber felt. The outer surface of the calcium silicate refractory fiber is provided with a steel plate, which is fixed to the kiln cylinder via screws. It should be noted that the kiln door 10 facilitates opening during overhaul of the lime kiln, and the installation of the aluminum silicate refractory fiber felt can improve the thermal insulation performance of the lime kiln.

[0031] For example, the kiln protection plate 9 is made of alloy material, which has good high temperature resistance and wear resistance.

[0032] For example, in this embodiment, the height of the lime kiln lining structure is about 25.5 meters, and the outer diameter of the lime kiln cylinder 1 is 7.2 meters; the first refractory brick layer 2 is a high-alumina brick LZ-75; the second refractory brick layer 3 is all high-alumina brick LZ-65; the first thermal insulation layer 4 is a high-alumina polylight brick 41 and a calcium silicate insulation board 42 from bottom to top; the high-alumina polylight brick 41 is arranged in an area 8 meters above the bottom of the lime kiln, and the calcium silicate insulation board 42 is arranged in an area from 8 meters to 23.3 meters above the bottom of the lime kiln; the second thermal insulation layer 5 is preferably a zirconium fiber board, which has high hardness and melting point and good thermal insulation performance; the third thermal insulation layer 6 is preferably an aluminum foil board that is resistant to high temperatures of 300-500°C. The aluminum foil board is attached to the lime kiln cylinder 1 through tin foil, has good plasticity, can reflect heat back, and prevent heat loss.

[0033] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A lime kiln lining structure, characterized in that: The utility model comprises a kiln roof lining and a kiln body lining, wherein the kiln roof lining is arranged at the inner top of the cylinder of the lime kiln, and the kiln body lining is arranged at the inner side of the cylinder of the lime kiln, and the kiln body lining comprises a first refractory brick layer, a second refractory brick layer, a first thermal insulation layer, a second thermal insulation layer and a third thermal insulation layer arranged in sequence from the inside to the outside, and the contact surface between two adjacent bricks in the first refractory brick layer is concave-convex matched and sealed; the strength of the kiln roof lining is higher than that of the first refractory brick layer, the second refractory brick layer, the first thermal insulation layer, the second thermal insulation layer and the third thermal insulation layer, and the kiln roof lining extends downward to form a reinforcement part, which is arranged between the first refractory brick layer and the first thermal insulation layer, and the bottom of the reinforcement part is connected to the second refractory brick layer; the inner side surface of the kiln roof lining and the upper surface of the first refractory brick layer away from the second refractory brick layer are provided with a kiln protection plate.

2. The lime kiln lining structure according to claim 1, characterized in that: Any brick in the first refractory brick layer is provided with a semicircular protrusion, and the other brick corresponding thereto is provided with a semicircular groove.

3. The lime kiln lining structure according to claim 1, characterized in that: The height of the kiln roof lining is 2.1 meters; the height of the reinforcement part is 1.9 meters.

4. The lime kiln lining structure according to claim 1, characterized in that: It also includes a kiln door sealed by high-alumina bricks, the outer surface of the kiln door is covered with calcium silicate refractory fiber felt, the outer surface of the calcium silicate refractory fiber is provided with a steel plate, and the steel plate is fixedly connected to the cylinder of the lime kiln by screws.

5. The lime kiln lining structure according to claim 1, characterized in that: The first refractory brick layer is high alumina brick LZ-75.

6. The lime kiln lining structure according to claim 1, characterized in that: The second refractory brick layer is made of high-alumina brick LZ-65.

7. The lime kiln lining structure according to claim 1, characterized in that: The first thermal insulation layer is composed of high-aluminum polylight bricks and calcium silicate insulation boards from bottom to top; the high-aluminum polylight bricks are arranged in an area 8 meters above the bottom of the lime kiln, and the calcium silicate insulation boards are arranged in an area from 8 meters to 23.3 meters above the bottom of the lime kiln.

8. The lime kiln lining structure according to claim 1, characterized in that: The second heat insulation layer is a zirconium fiber board.

9. The lime kiln lining structure according to claim 1, characterized in that: The third heat insulation layer is an aluminum foil board.

10. The lime kiln lining structure according to claim 1, characterized in that: The material of the kiln protection plate is alloy material.

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