A rotary kiln cooler with an external air chamber

Abstract

The present application relates to a rotary kiln cooler with external air chamber, comprising upper bin body, ring beam, central air distributor, chamber air distributor, lower cone bin, discharging cone and air supply pipeline; the rotary kiln cooler uses two different cooling methods to cool materials at different heights; in the upper part of the cooler, a plurality of air distributors embedded in the material layer and adapted to the shape characteristics of the material layer directly supply air to the material layer for pre-cooling; in the lower part of the cooler, the material is divided into multiple streams, and a plurality of air supply chambers are arranged to achieve uniform cooling in multiple regions; the cooler has simple structure, low material cooling temperature, can cool high-temperature materials from about 1100 DEG to more than 30 DEG to 50 DEG above room temperature, and has sufficient cooling, no red material inclusion, high thermal efficiency, and remarkable energy saving and emission reduction effect.

Description

Technical Field

[0001] This invention relates to a cooling device for use with a large lime rotary kiln, and more particularly to a rotary kiln cooler with an external air chamber. Background Technology

[0002] Large-scale rotary kilns for quicklime are used to calcine quicklime or lightly calcined dolomite for steelmaking and ironmaking. Coolers, used in conjunction with these kilns, are used to cool the high-temperature materials after calcination. As rotary kilns for quicklime develop towards large-scale and standardized production, coolers, as an important component of rotary kiln equipment, are also undergoing continuous improvement and innovation.

[0003] The cooler body is typically a vertical rectangular silo, storing the high-temperature material calcined in the rotary kiln. The material is fed naturally from top to bottom, and cooling air is continuously blown in to cool it. The air supply system is the core of the cooler, and its structure directly affects the cooling effect of the material, as well as the energy consumption and heat exchange rate of the air supply system. Meeting the requirements of uniform material cooling, low cooling temperature, and energy saving and emission reduction are the basic requirements for cooler design.

[0004] The coolers currently in use generally have the following problems: 1) Insufficient material cooling, with the presence of red material mixed in; 2) Uneven material cooling, with large temperature differences between different areas; 3) Dispersed and unconcentrated cooling air inlets, resulting in greater impact losses and easily causing uneven material cooling. Summary of the Invention

[0005] This invention provides a rotary kiln cooler with an external air chamber, employing two different cooling methods at different heights to cool materials. At the top of the cooler, multiple air distributors, embedded within the material layer and adapted to its shape, directly supply air to the material layer for pre-cooling. At the bottom of the cooler, the material is diverted, and multiple air chambers are provided to achieve uniform cooling across multiple areas. The cooler has a simple structure, cools materials to a low temperature (approximately 1100°C to 30°C–50°C above room temperature), provides thorough cooling without any red-hot material inclusions, exhibits high thermal efficiency, and demonstrates significant energy-saving and emission-reduction effects.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A rotary kiln cooler with an external air chamber includes an upper silo, a ring beam, a central air distributor, compartment air distributors, a lower conical silo, a discharge cone, and air supply ducts. The upper silo is a vertical silo with a material inlet at the top and supported on the ring beam at the bottom. The central air distributor is located at the center of the upper silo, and multiple compartment air distributors are arranged around it, with the central air distributor positioned higher than the compartment air distributors. The central air distributor includes a central air cone and a central air ring, and the compartment air... The air distributor is equipped with an air cone and an air ring; the bottom of the upper chamber is connected to multiple discharge cones, and each discharge cone is set in a corresponding manner to a compartment air distributor. A lower cone chamber is set around the discharge cone; the discharge cone is composed of multiple cone segments, and an annular gap is set between two adjacent cone segments; the space between the lower cone chamber and the discharge cone is divided into multiple air supply chambers, and the air supply chambers are connected to the compartment air distributors; the air supply pipes are connected to the central air distributor through a central air supply pipe, and connected to the corresponding air supply chambers through multiple air chamber air supply pipes.

[0008] The inner wall of the upper compartment is provided with a refractory insulation layer.

[0009] The central air distributor is located in the middle of the upper compartment and consists of a central air cone and a central air ring. The central air cone is located above the central air ring. The central air cone consists of a vertical air duct and a central air cap fixed above the vertical air duct. An annular air outlet is provided between the central air cap and the vertical air duct. The bottom end of the vertical air duct is connected to the central air supply duct. The central air ring consists of an annular air duct and an annular air cap fixed above the annular air duct. An inner annular air outlet and an outer annular air outlet are provided between the annular air cap and the annular air duct. The annular air duct is connected to the vertical air duct through an oblique connecting pipe.

[0010] The compartmentalized air distributor is located at the lower part of the upper chamber and consists of an air cone, an upper air ring, a lower air ring, and a bottom cone. The upper air ring is located above the air cone, and the lower air ring is located below the air cone. The air cone has an annular air outlet, and both the upper and lower air rings have inner and outer annular air outlets. The upper and lower air rings are connected by multiple vertical connecting pipes, and the air cone is connected to the bottom cone by a straight pipe. The straight pipe and the vertical connecting pipe are connected by multiple oblique connecting pipes. The bottom cone is connected to the air supply chamber through an internal transverse air duct.

[0011] The feeding cone consists of a top cone, a middle cone, and a bottom cone. The bottom of the top cone is inserted into the top of the middle cone by a certain distance, and the bottom of the middle cone is inserted into the top of the bottom cone by a certain distance. The top cone and the middle cone, and the middle cone and the bottom cone are connected by multiple connecting plates evenly arranged circumferentially. The bottom of the bottom cone is provided with a discharge pipe.

[0012] The shape of the lower cone hopper matches the shape of the discharge cone hopper, and a stepped structure is provided at the corresponding top cone hopper, middle cone hopper and bottom cone hopper.

[0013] The upper chamber is a square chamber, with four compartment air distributors located at the four corners of the upper chamber and four corresponding discharge cones; the lower cone chamber is a square cone chamber, with cross-shaped partitions and diagonal partitions inside, dividing the space between the lower cone chamber and the discharge cone into eight separate air supply chambers.

[0014] The air supply duct is introduced at the bottom of the lower cone, and the air supply duct located outside the lower cone integrates the central air supply duct and the air chamber air supply duct together. The central air supply duct is located at the center of multiple air chamber air supply ducts.

[0015] A support frame is provided at the bottom of the ring beam.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1) Two different cooling methods are used to cool the material at different heights; at the top of the cooler, multiple sets of air distributors (including central air distributors and compartment air distributors) are buried in the material layer and adapted to the shape characteristics of the material layer to directly supply air into the material layer for pre-cooling of the material; at the bottom of the cooler, the material is diverted and multiple air supply chambers are set up to achieve uniform cooling in multiple areas.

[0018] 2) Cooling air is concentrated and sent from the bottom of the equipment through an air supply duct that integrates a central air supply duct and a wind chamber air supply duct, which reduces air loss and improves heat exchange efficiency.

[0019] 3) The lower cone hopper adopts a stepped structure, and the internal part is matched with a feeding cone with a stepped discontinuous structure. After the cooler air is sent between the lower cone hopper and the feeding cone, multiple external air supply chambers are formed, which can continuously cool the material in the feeding cone.

[0020] 4) The segmented feeding cone allows cooling air to directly wet and penetrate the material at the connection points of each segment, reaching the core and thus fully cooling the material; multiple air supply chambers facilitate full and uniform cooling of the material.

[0021] 5) Cooling air is fed in from the bottom of the equipment and flows upward in a counter-current manner to cool the materials in each part in turn before entering the rotary kiln and being reused as combustion air.

[0022] 6) The rotary kiln cooler has a simple structure, provides uniform material cooling, has a low cooling temperature, and achieves significant energy saving and emission reduction effects, greatly improving the cooling effect. Attached Figure Description

[0023] Figure 1 This is a front view of the rotary kiln cooler described in this invention.

[0024] Figure 2 This is a side view of the rotary kiln cooler described in this invention.

[0025] Figure 3 yes Figure 2 The CC view in the middle.

[0026] Figure 4 yes Figure 2 DD view in the middle.

[0027] Figure 5 yes Figure 2 The EE view in the middle.

[0028] In the diagram: 1-Upper compartment 1.1-Refractory insulation layer 2-Central air distributor 2.1-Central air cone 2.2-Central air ring 2.3-Vertical air duct 3-Compartment air distributor 3.1-Air cone 3.2-Upper air ring 3.3-Lower air ring 3.4-Bottom cone 4-Ring beam 5-Lower cone compartment 6-Discharge cone 6.1-Top cone 6.2-Middle cone 6.3-Bottom cone 6.4-Connecting plate 7-Air supply duct 7.1-Central air supply duct 7.2-Air chamber air supply duct 8-Internal transverse air duct 9-Diagonal partition 10-Air supply chamber 10.1-Cooling air inlet 11-Support frame 12-Cross partition Detailed Implementation

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0030] like Figure 1 , Figure 2 As shown, the rotary kiln cooler with an external air chamber according to the present invention includes an upper silo 1, a ring beam 4, a central air distributor 2, compartment air distributors 3, a lower conical silo 5, a discharge cone 6, and an air supply duct 7; the upper silo 1 is a vertical silo with a material inlet at the top and supported at the bottom by the ring beam 4; the central air distributor 2 is located at the center of the upper silo 1, and multiple compartment air distributors 3 (such as...) are arranged around the central air distributor 2. Figure 5As shown, the central air distributor 2 is positioned higher than the compartment air distributor 3; the central air distributor 2 is equipped with a central air cone 2.1 and a central air ring 2.2, and the compartment air distributor 3 is equipped with an air cone 3.1 and an air ring; the bottom of the upper hopper 1 is connected to multiple discharge cones 6, which are arranged one-to-one with the compartment air distributors 3, and a lower cone hopper 5 is provided around the discharge cone hopper 6; the discharge cone hopper 6 is composed of multiple cone segments, and an annular gap is provided between two adjacent cone segments; the space between the lower cone hopper 5 and the discharge cone hopper 6 is divided into multiple air supply chambers 10, and the air supply chambers 10 are connected to the compartment air distributor 3; the air supply pipe 7 is connected to the central air distributor 2 through the central air supply pipe 7.1, and is connected to the corresponding air supply chamber 10 through multiple air supply pipes 7.2.

[0031] The inner wall of the upper compartment 1 is provided with a refractory insulation layer 1.1.

[0032] The central air distributor 2 is located in the middle of the upper compartment 1 and consists of a central air cone 2.1 and a central air ring 2.2. The central air cone 2.1 is located above the central air ring 2.2. The central air cone 2.1 consists of a vertical air duct and a central air cap fixed above the vertical air duct. An annular air outlet is provided between the central air cap and the vertical air duct. The bottom end of the vertical air duct is connected to the central air supply duct 7.1. The central air ring 2.2 consists of an annular air duct and an annular air cap fixed above the annular air duct. An inner annular air outlet and an outer annular air outlet are provided between the annular air cap and the annular air duct. The annular air duct is connected to the vertical air duct through an oblique connecting pipe.

[0033] The compartmentalized air distributor 3 is located at the lower part of the upper chamber 1 and consists of an air cone 3.1, an upper air ring 3.2, a lower air ring 3.3, and a bottom cone 3.4. The upper air ring 3.2 is located above the air cone 3.1, and the lower air ring 3.3 is located below the air cone 3.1. The air cone 3.1 has an annular air outlet, and both the upper air ring 3.2 and the lower air ring 3.3 have an inner annular air outlet and an outer annular air outlet. The upper air ring 3.2 and the lower air ring 3.3 are connected by multiple vertical connecting pipes, and the air cone 3.1 is connected to the bottom cone 3.4 by a straight pipe. The straight pipe and the vertical connecting pipe are connected by multiple oblique connecting pipes. The bottom cone 3.4 is connected to the air supply chamber 10 through an internal transverse air duct 8.

[0034] The feeding cone 6 consists of a top cone 6.1, a middle cone 6.2, and a bottom cone 6.3. The bottom of the top cone 6.1 is inserted into the top of the middle cone 6.2 by a certain distance, and the bottom of the middle cone 6.2 is inserted into the top of the bottom cone 6.3 by a certain distance. The top cone 6.1 and the middle cone 6.2, and the middle cone 6.2 and the bottom cone 6.3, are connected by multiple connecting plates 6.4 evenly arranged circumferentially (e.g., ...). Figure 3 (As shown); the bottom of the bottom cone hopper 6.3 is equipped with a discharge pipe.

[0035] The shape of the lower cone hopper 5 matches the shape of the discharge cone hopper 6, and a stepped structure is provided at the corresponding top cone hopper 6.1, middle cone hopper 6.2 and bottom cone hopper 6.3.

[0036] The upper hopper 1 is a square hopper, with four compartment air distributors 3 located at the four corners of the upper hopper 1, and four corresponding discharge cones 6; for example... Figure 4 As shown, the lower cone hopper 5 is a square cone hopper. The lower cone hopper 5 is equipped with a cross partition 12 and a diagonal partition 9, which divides the space between the lower cone hopper 5 and the discharge cone hopper 6 into 8 separate air supply chambers.

[0037] The air supply duct 7 is introduced at the bottom of the lower cone 5, and the air supply duct 7 located outside the lower cone 5 integrates the central air supply duct 7.1 and the air chamber air supply duct 7.2 together. The central air supply duct 7.1 is located at the center of multiple air chamber air supply ducts 7.2.

[0038] A support frame 11 is provided at the bottom of the ring beam 4.

[0039] The following embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments.

[0040]

Example

[0041] In this embodiment, a rotary kiln cooler with an external air chamber is used for countercurrent cooling of high-temperature materials that are naturally fed from top to bottom.

[0042] like Figure 1 , Figure 2 As shown, the upper silo 1 is a vertical rectangular silo with no internal compartments, and the inner wall is lined with a refractory insulation layer 1.1. The high-temperature material from the rotary kiln naturally accumulates inside the upper silo 1.

[0043] A central air distributor 2 and four surrounding compartment air distributors 3 are respectively installed at different heights in the upper silo 1. The central air distributor 2 is located at the center of the upper silo 1 and is directly supplied with air by a central air supply duct 7.1. Four air supply chambers 10 (numbered 1 to 4) are provided between the lower cone silo 5 and the discharge cone hopper 6, supplied with air by four corresponding air supply ducts 7.2; the cooling air in the four air supply chambers 10 can enter the compartment air distributors 3 through internal transverse air ducts 8 (e.g., ...). Figure 5 (As shown). The cooling air supplied to the rotary kiln cooler by two types of air distributors forms a three-dimensional airflow layer in the material layer, continuously pre-cooling the material.

[0044] The upper silo 1 is supported on a ring beam 4, which in this embodiment is made of H-beams. The inner wall of the silo below the ring beam 4 is not lined with refractory material, and material diversion begins from there, implementing a zone cooler. The four corners of the ring beam 4 are the four support points for the rotary kiln cooler. The lower conical silo 5 and the discharge cone hopper 6 located within the lower conical silo 5 are suspended below the ring beam 4.

[0045] In this embodiment, cross-shaped baffles 12 are installed in both the ring beam 4 and the lower cone hopper 5 for compartmentalization. After material diversion, it enters the four discharge cone hoppers 6 respectively. Four air supply chambers 10 are formed between the lower cone hopper 5 and the four discharge cone hoppers 6. As the material moves down along the discharge cone hopper 6, it is fully cooled circumferentially by the cooling air introduced into the air supply chambers 10. The air supply pipe 7.2 is used to blow cooling air into the air supply chambers 10. The cooling air is concentrated and sent into the air supply pipe 7 at the bottom, and after cooling each part of the material in a counter-current upward flow, it enters the rotary kiln and is reused as combustion air.

[0046] In this embodiment, the lower conical hopper 5 is a square conical hopper with a stepped structure. The shape of the lower conical hopper 5 matches that of the discharge cone 6, which facilitates the upward movement of air along the conical surface. Cross-shaped partitions 12 are arranged along the longitudinal and transverse directions inside the lower conical hopper 5. The cross-shaped partitions 12 and the corresponding hopper walls of the lower conical hopper 5 enclose four independent areas. The four discharge cones 6 are suspended in the middle of the corresponding areas and run vertically through each other. The space between the discharge cones 6 in the four areas and the lower conical hopper 5 forms four air supply chambers: 1#, 2#, 3#, and 4#.

[0047] In this embodiment, to ensure uniform cooling, diagonal partitions 9 are provided in each air supply chamber 10 along the diagonal direction, dividing one air supply chamber 10 into two separate air supply chambers along the diagonal. The four air supply chambers 10 are divided into a total of eight separate air supply chambers, and each discharge cone 6 is sandwiched between two corresponding separate air supply chambers.

[0048] like Figure 4 As shown, a slot is cut at the intersection of the cross-shaped partition 12, and the central air supply pipe 7.1 passes through the slot. The bottom of the lower cone 5 overlaps with the cross-shaped partition 12 and the diagonal partition 9 to form 8 openings, which are the cooling air inlets 10.1 of the 8 partitioned air supply chambers. Each cooling air inlet 10.1 is a triangle corresponding to the partitioned air supply chamber.

[0049] In this embodiment, the air supply duct 7 located below the lower conical compartment 5 is a square duct with five independent air supply pipes inside. The central one is a circular central air supply duct 7.1. The square ducts surrounding the central air supply duct 7.1 are divided into four air chamber air supply ducts 7.2 by partitions. The air supply duct 7 located outside the lower conical compartment 5 consists of a horizontal section and an arc-shaped section. The horizontal section extends to the center of the lower conical compartment 5 and then turns upward through the arc-shaped section. The central air supply duct 7.1 extends vertically upward and connects to the vertical duct of the central air distributor 2. The four air chamber air supply ducts 7.2 extend vertically upward and connect to their corresponding cooling air inlets 10.1. The arc-shaped section uses a large radius arc to reduce resistance loss.

[0050] In this embodiment, the feeding cone 6 has a stepped, discontinuous structure, consisting of three cone sections: a top cone 6.1, a middle cone 6.2, and a bottom cone 6.3, connected sequentially. Cooling air permeates and penetrates the material layer through the annular gaps at the connections between the cone sections, causing the material to cool gradually. The upper edge of the top cone 6.1 is welded and fixed to the ring beam 4. The upper edge of the middle cone 6.2 is connected to the lower edge of the top cone 6.1 via multiple connecting plates 6.4, and the lower edge of the middle cone 6.2 is connected to the upper edge of the bottom cone 6.3 via multiple connecting plates 6.4. The middle cone 6.2 extends through the wall of the lower cone 5, and the exit point is welded and fixed to the wall. A supporting ring beam is provided on the outer periphery of the lower cone 5. The material in the gaps between the cone sections is directly exposed to the cooling air introduced into the air supply chamber 10, allowing the cooling air to penetrate the material layer and fully cool the core material. Cooling air supplied from the bottom of the air supply chamber 10 seeps upwards into the material layer between each section of the cone bucket. During this process, the material is cooled down gradually. After cooling, the material discharged from the discharge pipe of the bottom cone bucket 6.3 is free of red material.

[0051] The top cone 6.1 has openings on all four sides, and the bottom cone 3.4 of each compartment air distributor 3 has corresponding openings on its side. The internal transverse air duct 8 is transversely connected between the two openings, so that the cooling air in each compartment air supply chamber can enter the air cone 3.1 and air ring in the compartment air distributor 3.

[0052] The central air distributor 2 is located inside the upper compartment 1, near the top of the material layer, and consists of a central air cone 2.1 and a central air ring 2.2. Cooling air within the central air ring 2.2 is blown outwards from both the inner and outer annular air outlets, thus forming a double-ring continuous airflow consisting of an inner and outer ring. The conical airflow layer formed by the central air distributor 2 within the material layer adapts to the natural accumulation of the top material layer, exhibiting a conical distribution characteristic that is high in the middle and low around the edges. The central air ring 2.2, located at the lower position, is connected to the vertical air duct via four evenly distributed oblique connecting pipes, thus achieving air delivery.

[0053] Four compartment air distributors 3 are located at the bottom of the upper chamber 1, where the material layer is continuously stacked and has a columnar distribution. In this embodiment, each compartment air distributor 3 consists of a central air cone 3.1, an upper air ring 3.2 above the air cone 3.1, and a lower air ring 3.3 below the air cone 3.1, forming a columnar airflow layer dominated by the central airflow to ensure sufficient and uniform cooling. The upper air ring 3.2 and the lower air ring 3.2 are supported and connected by four vertical connecting pipes, and the air cone 3.1 is connected to the vertical connecting pipes through four evenly distributed oblique connecting pipes to deliver air.

[0054] 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 cooler with an external air chamber, characterized in that, The silo comprises an upper silo body, a ring beam, a central air distributor, compartment air distributors, a lower conical silo, a discharge cone, and air supply ducts. The upper silo body is a vertical silo with a material inlet at the top and supported at the bottom by the ring beam. The central air distributor is located at the center of the upper silo body, and multiple compartment air distributors are arranged around it, with the central air distributor positioned higher than the compartment air distributors. The central air distributor has a central air cone and a central air ring, while the compartment air distributors have air cones and air rings. Multiple discharge cones are connected to the bottom of the upper silo body, with each discharge cone corresponding to one of the compartment air distributors. The lower conical silo is located around each discharge cone. Each discharge cone consists of multiple cone segments, with an annular gap between adjacent segments. The space between the lower conical silo and the discharge cone is divided into multiple air supply chambers, which are connected to the compartment air distributors. The air supply ducts are connected to the central air distributor via a central air supply duct and to the corresponding air supply chambers via multiple air supply ducts. The central air distributor is located in the middle of the upper compartment and consists of a central air cone and a central air ring. The central air cone is located above the central air ring. The central air cone consists of a vertical air duct and a central air cap fixed above the vertical air duct. An annular air outlet is provided between the central air cap and the vertical air duct. The bottom end of the vertical air duct is connected to the central air supply duct. The central air ring consists of an annular air duct and an annular air cap fixed above the annular air duct. An inner annular air outlet and an outer annular air outlet are provided between the annular air cap and the annular air duct. The annular air duct is connected to the vertical air duct through an oblique connecting pipe. The compartmentalized air distributor is located at the lower part of the upper chamber and consists of an air cone, an upper air ring, a lower air ring, and a bottom cone. The upper air ring is located above the air cone, and the lower air ring is located below the air cone. The air cone has an annular air outlet, and both the upper and lower air rings have inner and outer annular air outlets. The upper and lower air rings are connected by multiple vertical connecting pipes, and the air cone is connected to the bottom cone by a straight pipe. The straight pipe and the vertical connecting pipe are connected by multiple oblique connecting pipes. The bottom cone is connected to the air supply chamber through an internal transverse air duct. The feeding cone consists of a top cone, a middle cone, and a bottom cone. The bottom of the top cone is inserted into the top of the middle cone by a certain distance, and the bottom of the middle cone is inserted into the top of the bottom cone by a certain distance. The top cone and the middle cone, and the middle cone and the bottom cone are connected by multiple connecting plates evenly arranged circumferentially. The bottom of the bottom cone is provided with a discharge pipe. The shape of the lower cone hopper matches the shape of the discharge cone hopper, and a stepped structure is provided at the corresponding top cone hopper, middle cone hopper and bottom cone hopper.

2. A rotary kiln cooler with an external air chamber according to claim 1, characterized in that, The inner wall of the upper compartment is provided with a refractory insulation layer.

3. A rotary kiln cooler with an external air chamber according to claim 1, characterized in that, The upper chamber is a square chamber, with four compartment air distributors located at the four corners of the upper chamber and four corresponding discharge cones; the lower cone chamber is a square cone chamber, with cross-shaped partitions and diagonal partitions inside, dividing the space between the lower cone chamber and the discharge cone into eight separate air supply chambers.

4. A rotary kiln cooler with an external air chamber according to claim 1, characterized in that, The air supply duct is introduced at the bottom of the lower cone, and the air supply duct located outside the lower cone integrates the central air supply duct and the air chamber air supply duct together. The central air supply duct is located at the center of multiple air chamber air supply ducts.

5. A rotary kiln cooler with an external air chamber according to claim 1, characterized in that, A support frame is provided at the bottom of the ring beam.

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