A rotary kiln cylinder waste heat drying device

Abstract

This invention relates to a rotary kiln waste heat drying device, comprising two sets of parallel supports, two sets of pulleys, a lifting material box, and a PLC control cabinet. The two sets of supports have identical structures. Each set of supports includes two parallel first legs and second legs, which are fixed to the ground. A crossbeam is welded to the top of the first and second legs. In the production process of industries such as cement and ceramsite, the plastic raw materials and some additives used have high moisture content. Drying these materials using the waste heat of the rotary kiln can meet the moisture requirements of production, thus not only avoiding ball mill failures but also achieving the goal of energy conservation and consumption reduction through waste heat utilization, and implementing the national requirements for energy conservation and consumption reduction.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology for rotary kiln cylinders, and more particularly to a waste heat drying device for rotary kiln cylinders. Background Technology

[0002] Rotary kilns are commonly used calcination equipment in industry, meeting the needs of most sectors. They are primarily used in the building materials, non-metallic mineral processing, and chemical industries. The thermal efficiency of a rotary kiln is only around 59%, with the remainder lost through heat dissipation from the kiln system surface and heat carried away by exhaust gases at the kiln head and tail. While mature technologies exist for recovering and utilizing the high-temperature exhaust gases at the kiln head and tail, the surface temperature of the rotary kiln shell is significantly lower than the waste heat temperature at the kiln tail, making collection and utilization difficult. Common drawbacks include either non-collection and utilization, or complex, costly, and inconveniently designed collection and utilization devices, resulting in unsatisfactory recovery effects and even hindering the maintenance and repair of the rotary kiln shell. The kiln body of a rotary kiln is a steel-surfaced cylinder, completely exposed to the air. From a production process perspective, the surface temperature of the rotary kiln cylinder is basically constant, ranging from approximately 250℃ to 350℃. The cylinder exchanges heat with the surrounding environment through radiation and convection, resulting in a significant waste of heat, accounting for about 25% of the total heat loss. This large amount of heat radiated into the surrounding environment not only wastes energy but also deteriorates the working environment. Therefore, it is urgent to conveniently and rationally recover and utilize the waste heat from the surface of the rotary kiln cylinder.

[0003] In the production process of cement, ceramsite, and other industries, materials need to be granulated before entering the calcination stage. Therefore, plastic raw materials or additives are required. The moisture content of general plastic raw materials is 30% to 40%, while some additives have a moisture content of over 80%. Moisture is usually removed by natural air drying or drying equipment. However, the moisture content of naturally air-dried materials often does not reach the ideal moisture content of less than 5% for entering the mill. Such materials are prone to sticking to the balls and clogging the grate when entering the ball mill, which can lead to equipment failure, affect normal production, and increase maintenance manpower and material costs. Summary of the Invention

[0004] The problem solved by this invention is to provide a rotary kiln shell waste heat drying device, which has a simple structure, is easy to use, and has a low cost. It can solve the process requirements for drying input materials in production, and at the same time solve the problem of difficult recycling of heat dissipation on the surface of the rotary kiln shell. It is energy-saving and environmentally friendly, reduces investment, and lowers production costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A rotary kiln waste heat drying device includes two sets of supports arranged in parallel, two sets of pulleys, a lifting material box and a PLC control cabinet. The two sets of supports have the same structure. Each set of supports includes two parallel first legs and second legs, and the first legs and second legs are fixed to the ground. A crossbeam is welded to the top of the first legs and second legs.

[0007] The two sets of pulleys have the same structure. Each set of pulleys is installed on the same bracket. Each set of pulleys includes a first single-groove fixed pulley, a second single-groove fixed pulley, a double-groove fixed pulley, and a single-groove movable pulley with a single hook. The first single-groove fixed pulley is installed on the inside of the first support leg, the second single-groove fixed pulley is installed on the inside of the second support leg, and the double-groove fixed pulley is fixedly installed on the part of the crossbeam protruding from the second support leg. The single-groove movable pulley is connected between the double-groove fixed pulley and the electric hoist by a third steel wire rope.

[0008] The two electric hoists are respectively installed on the ground below the double-rope groove fixed pulley;

[0009] The lifting material box is slidably installed in two sets of brackets, and the lifting material box is located below the rotary kiln;

[0010] The PLC control cabinet is electrically connected to the electric hoist.

[0011] Preferably, the height of the first and second legs is 200mm-300mm higher than the top of the rotary kiln, and the heights of the first and second legs are the same. The width between the first and second legs is 500mm-600mm greater than the outer diameter of the rotary kiln.

[0012] Preferably, the length of the crossbeam is greater than the width between the first leg and the second leg by 1000mm, one end of the crossbeam is aligned with the first leg, and the other end of the crossbeam protrudes from the second leg.

[0013] Preferably, one end of the first wire rope is fixed to a lifting point of the lifting box, and the other end of the first wire rope is fixed to a single-groove movable pulley via a first single-groove fixed pulley and a double-groove fixed pulley.

[0014] One end of the second wire rope is fixed to another lifting point of the lifting box, and the other end of the second wire rope is fixed to the single hook of the single-rope groove movable pulley after passing through the second single-rope groove fixed pulley and the double-rope groove fixed pulley.

[0015] Preferably, one end of the third wire rope is connected to the electric hoist via a single-rope groove pulley, and the other end of the third wire rope is installed on the ground at the bottom of the outrigger.

[0016] Preferably, the rotary kiln is located on two rotary kiln support rollers, the lifting material box is aligned with the length direction of the rotary kiln, and the width of the lifting material box is greater than the diameter of the rotary kiln by 260mm-300mm.

[0017] Preferably, the height of the box edge at both ends in the length direction of the lifting box is 200mm, and it is equipped with hinges and locks; the height of the box edge at both ends in the width direction of the lifting box is 500mm.

[0018] The lifting box has four symmetrical lifting points, which are 1500mm-2000mm away from both ends of the box. The four lifting points are connected to the first wire rope and the second wire rope, respectively.

[0019] The beneficial effects of this invention are:

[0020] 1. In the production process of industries such as cement and ceramsite sand, the plastic raw materials and some additives used have high moisture content. Drying these materials using the waste heat of the rotary kiln can meet the moisture requirements of production. This not only avoids ball mill failure, but also achieves the purpose of energy conservation and consumption reduction through waste heat utilization, thus fulfilling the national requirements for energy conservation and consumption reduction.

[0021] 2. This invention has a simple structure, is easy to use, has low cost, is highly flexible, and is easy to shut down. It has no impact on other production processes and also solves the problem of difficult recycling of heat dissipation from the surface of the rotary kiln.

[0022] 3. This invention can dry 3 tons of material with a moisture content of 80% per hour. In practice, evaporating 1 kg of moisture requires an average of about 1000 kcal of heat. If calculated based on 300 production days per year and 16 drying hours per day, the annual energy saving for drying materials is (3000 kg * 80% * 1000 kcal * 300 days * 16 hours). h ) = 1.15 * 10 10 KCA1 is equivalent to approximately 1645 tons of standard coal, and has considerable economic and social benefits;

[0023] 4. The present invention adopts an intermittent static drying process, which solves the long-standing problem of drying some additive materials with high moisture content, no flowability, and strong adhesion. Its disadvantage is that it requires manual assistance in loading and unloading, which is labor-intensive. Attached Figure Description

[0024] Figure 1 This is a side view of the present invention;

[0025] Figure 2 This is a front view of the present invention.

[0026] Legend:

[0027] 1. First support leg; 2. Second support leg; 3. Crossbeam; 4. Lifting material box; 5. First single-rope groove fixed pulley; 6. Second single-rope groove fixed pulley; 7. Double-rope groove fixed pulley; 8. Single-rope groove movable pulley; 9. Electric hoist; 10. First wire rope; 11. Second wire rope; 12. Third wire rope; 13. PLC control cabinet; 14. Rotary kiln; 15. Rotary kiln support roller foundation. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Specific implementation examples are given below.

[0030] See Figure 1 and Figure 2 A rotary kiln waste heat drying device includes two sets of parallel supports, two sets of pulleys, a lifting material box 4, and a PLC control cabinet 13. The two sets of supports have the same structure. Each set of supports includes two parallel first legs 1 and second legs 2, which are fixed to the ground. A crossbeam 3 is welded to the top of the first legs 1 and second legs 2. The height of the first legs 1 and second legs 2 is 200mm-300mm higher than the top of the rotary kiln 14, and the height of the first legs 1 and second legs 2 is the same. The width between the first legs 1 and second legs 2 is 500mm-600mm greater than the outer diameter of the rotary kiln 14. The length of the crossbeam 3 is 1000mm greater than the width between the first legs 1 and second legs 2. One end of the crossbeam 3 is aligned with the first leg 1, and the other end of the crossbeam 3 protrudes from the second leg 2, which facilitates the installation and fixing of the two sets of pulleys and provides support for the lifting material box 4.

[0031] The two sets of pulleys have the same structure. Each set of pulleys is installed on the same bracket. Each set of pulleys includes a first single-groove fixed pulley 5, a second single-groove fixed pulley 6, a double-groove fixed pulley 7, and a single-groove movable pulley 8 with a single hook. The first single-groove fixed pulley 5 is installed inside the first support leg 1, the second single-groove fixed pulley 6 is installed inside the second support leg 2, the double-groove fixed pulley 7 is fixedly installed on the part of the crossbeam 3 that protrudes from the second support leg 2, and the single-groove movable pulley 8 is connected between the double-groove fixed pulley 7 and the electric hoist 9 through a third steel wire rope 12.

[0032] One end of the first wire rope 10 is fixed to a lifting point of the lifting box 4, and the other end of the first wire rope 10 is fixed to the single-groove movable pulley 8 via the first single-groove fixed pulley 5 and the double-groove fixed pulley 7.

[0033] One end of the second wire rope 11 is fixed to another lifting point of the lifting box 4. The other end of the second wire rope 11 is fixed to the single hook of the single-groove movable pulley 8 through the second single-groove fixed pulley 6 and the double-groove fixed pulley 7. One end of the third wire rope 12 is connected to the electric hoist 9 through the single-groove movable pulley 8, and the other end of the third wire rope 12 is installed on the ground at the bottom of the outrigger. The electric hoist 9 stretches the third wire rope 12, thereby pulling the connected single-groove movable pulley 8 to move. At this time, the first wire rope 10 and the second wire rope 11 connected to the single-groove movable pulley 8 pass through the first single-groove fixed pulley 5, the second single-groove fixed pulley 6 and the double-groove fixed pulley 7 respectively, pulling the lifting box 4 to move and adjusting the height and angle of the lifting box 4. The length of each wire rope is determined according to the lifting height of the lifting box 4.

[0034] Two electric hoists 9 are installed on the ground below the double-rope groove fixed pulley 7;

[0035] The lifting material box 4 is slidably installed in two sets of brackets, and the lifting material box 4 is located below the rotary kiln 14. The rotary kiln 14 is located on two rotary kiln support roller bases 15. The lifting material box 4 is aligned with the length direction of the rotary kiln 14. The width of the lifting material box 4 is 260mm-300mm greater than the diameter of the rotary kiln 14. The height of the box edge at both ends of the length direction of the lifting material box 4 is 200mm, and it is equipped with hinges and locks for easy opening and closing during material discharge. The height of the box edge at both ends of the width direction of the lifting material box 4 is 500mm. The structure and material selection of the lifting material box 4 are determined by the load after the lifting material box 4 is loaded with material. The material can be carbon steel or stainless steel.

[0036] The PLC control cabinet 13 is electrically connected to the electric hoist 9. The PLC control cabinet 13 controls the operation of the electric hoist 9 to drive the wire rope to extend and shorten, thereby controlling the rise and fall of the lifting box 4.

[0037] The lifting box 4 is equipped with four symmetrical lifting points. The distance between the lifting points and the two ends of the box is 1500mm-2000mm. The four lifting points are respectively connected to the first wire rope 10 and the second wire rope 11.

[0038] The loading and unloading machine pours the material into the lifting material box 4, loading 6-7 tons each time. The material is then evenly distributed at the bottom of the lifting material box 4 by the operator, with a thickness of 150mm. At the same time, two electric hoists 9 are started, raising the lifting material box 4 to a position 30mm-50mm away from the rotary kiln 14. After drying for 2 hours, the two electric hoists 9 are started again to lower the lifting material box 4 to a certain angle to facilitate material discharge. The lower end of the lifting material box 4 is 600mm from the ground, and the upper end is determined according to the space from the rotary kiln 14. The dried material is manually discharged and loaded into the hopper of the loading and unloading machine. After the material is discharged, the electric hoists 9 are started to lower the lifting material box 4 to the ground. Then, the loading, drying, and discharging are repeated in sequence. One cycle takes 3 hours. This process is controlled by the PLC control cabinet 13.

[0039] 1. In the production process of industries such as cement and ceramsite sand, the plastic raw materials and some additives used have high moisture content. These materials can be dried by using the waste heat of the rotary kiln to meet the moisture requirements of production. This not only avoids ball mill failure, but also achieves the purpose of energy conservation and consumption reduction by utilizing waste heat, and implements the national requirements for energy conservation and consumption reduction.

[0040] 2. This invention has a simple structure, is easy to use, has low cost, is highly flexible, and is easy to shut down. It has no impact on other production processes and also solves the problem of difficult recycling of heat dissipation from the surface of the rotary kiln 14 cylinder.

[0041] 3. This invention can dry 3 tons of material with a moisture content of 80% per hour. In practice, evaporating 1 kg of moisture requires an average of about 1000 kcal of heat. If calculated based on 300 production days per year and 16 drying hours per day, the annual energy savings from drying materials would be (3000 kg * 80% * 1000 kcal * 300 days * 16 hours) = 1.15 * 10 10 kcal is equivalent to approximately 1645 tons of standard coal, which has considerable economic and social benefits;

[0042] 4. The present invention adopts an intermittent static drying process, which solves the long-standing problem of drying some additive materials with high moisture content, no flowability, and strong adhesion. Its disadvantage is that it requires manual assistance in loading and unloading, which is labor-intensive.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rotary kiln shell afterheat drying device, characterized in that, It includes two sets of supports arranged in parallel, two sets of pulleys, a lifting material box (4) and a PLC control cabinet (13). The two sets of supports have the same structure. Each set of supports includes two parallel first legs (1) and second legs (2). The first legs (1) and second legs (2) are fixed to the ground. The crossbeam (3) is welded to the top of the first legs (1) and second legs (2). The two sets of pulleys have the same structure. Each set of pulleys is installed on the same bracket. Each set of pulleys includes a first single-groove fixed pulley (5), a second single-groove fixed pulley (6), a double-groove fixed pulley (7), and a single-groove movable pulley (8) with a single hook. The first single-groove fixed pulley (5) is installed inside the first support leg (1), the second single-groove fixed pulley (6) is installed inside the second support leg (2), the double-groove fixed pulley (7) is fixedly installed on the part of the crossbeam (3) that protrudes from the second support leg (2), and the single-groove movable pulley (8) is connected between the double-groove fixed pulley (7) and the electric hoist (9) by a third steel wire rope (12). The two electric hoists (9) are respectively installed on the ground below the double-rope groove fixed pulley (7); The lifting material box (4) is slidably installed in two sets of brackets, and the lifting material box (4) is located below the rotary kiln (14); The PLC control cabinet (13) is electrically connected to the electric hoist (9); The height of the first leg (1) and the second leg (2) is 200mm-300mm higher than the top of the rotary kiln (14), and the height of the first leg (1) and the second leg (2) is the same. The width between the first leg (1) and the second leg (2) is greater than the outer diameter of the rotary kiln (14) by 500mm-600mm. Start two electric hoists (9) and raise the material box (4) to a distance of 30mm-50mm from the rotary kiln (14) cylinder for drying.

2. A rotary kiln shell afterheat drying device according to claim 1, characterized in that, The length of the crossbeam (3) is 1000mm greater than the width between the first leg (1) and the second leg (2), and one end of the crossbeam (3) is aligned with the first leg (1), while the other end of the crossbeam (3) protrudes from the second leg (2).

3. A rotary kiln shell afterheat drying device according to claim 2, characterized in that, One end of the first wire rope (10) is fixed at a lifting point of the lifting box (4), and the other end of the first wire rope (10) is fixed on the single-groove movable pulley (8) through the first single-groove fixed pulley (5) and the double-groove fixed pulley (7). One end of the second wire rope (11) is fixed to another hoisting point of the lifting box (4), and the other end of the second wire rope (11) is fixed to the single hook of the single rope groove moving pulley (8) through the second single rope groove fixed pulley (6) and the double rope groove fixed pulley (7).

4. A rotary kiln shell afterheat drying device according to claim 3, characterized in that, One end of the third wire rope (12) is connected to the electric hoist (9) via a single-rope groove pulley (8), and the other end of the third wire rope (12) is installed on the ground at the bottom of the outrigger.

5. A rotary kiln shell afterheat drying device according to claim 4, characterized in that, The rotary kiln (14) is located on two rotary kiln support roller bases (15). The lifting material box (4) is aligned with the length direction of the rotary kiln (14). The width of the lifting material box (4) is 260mm-300mm greater than the diameter of the rotary kiln (14).

6. A rotary kiln shell afterheat drying device according to claim 5, characterized in that, The height of the box edge at both ends of the lifting box (4) in the length direction is 200mm, and it is equipped with hinges and locks. The height of the box edge at both ends of the lifting box (4) in the width direction is 500mm. The lifting box (4) is equipped with four symmetrical lifting points. The distance between the lifting points and the two ends of the box is 1500mm-2000mm. The four lifting points are respectively connected to the first wire rope (10) and the second wire rope (11).

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