A large rotary kiln system and working method thereof

Abstract

The present invention relates to a large rotary kiln system and a working method thereof, wherein the large rotary kiln system comprises a rotary kiln, a preheater system, a material chute and a material cooling system; the rotary kiln is provided with two-stage supports; the preheater system comprises a material distribution bin, a preheater body and a material pushing system; a material chute is provided between a material discharge port at the bottom of the preheater system and an entrance of the rotary kiln; the top of the material cooling system is connected to the outlet of the rotary kiln, a material discharge port is provided at the bottom, and a cooler with an external air chamber is provided in the material cooling system. The present invention is used for calcining active lime or light-burned dolomite; a large rotary kiln with two-stage supports is used as the core equipment, a preheater system is provided at the front end of the system, a material cooling system is provided at the rear end, and other related supporting equipment together constitute a large rotary kiln system; as an advanced technology leading the green development of the steel industry, it has significant comprehensive benefits and advantages in terms of improving resource utilization, improving lime quality, and saving energy.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, and in particular to a large rotary kiln system and a working method thereof. Background Art

[0002] Active lime is an important auxiliary material for industrial production and is widely used in many industries such as chemical industry, calcium carbide, alumina, papermaking, environmental protection, etc. Active lime produced by rotary kiln has the characteristics of uniform calcination and stable product quality. From the 1970s to the beginning of this century, my country's lime rotary kiln production line was limited to a few large steel companies, but the total production capacity accounted for a low proportion, the output of a single kiln was low, and it was difficult to form economies of scale. Therefore, it is urgent to develop a large-scale lime rotary kiln system.

[0003] The present invention provides a large rotary kiln system with two-stage support, which is used for calcining active lime or light-burned dolomite. It has comprehensive benefits and advantages in many aspects, such as improving resource utilization, improving lime quality, and saving energy. It is an advanced technology leading the green development of the steel industry. Summary of the invention

[0004] The present invention provides a large rotary kiln system and a working method thereof, which are used for calcining active lime or light-burned dolomite. The large rotary kiln system is composed of a two-stage supported large rotary kiln as the core equipment, a preheater system is configured at the front end of the system, a material cooling system is arranged at the rear end, and other related supporting equipment. As an advanced technology leading the green development of the steel industry, it has significant comprehensive benefits and advantages in improving resource utilization, improving lime quality, saving energy, etc.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A large rotary kiln system comprises a rotary kiln, a preheater system, a material chute and a material cooling system; the rotary kiln is provided with two-stage supports, the kiln body of the rotary kiln is tilted, the lower end is the kiln head end, and the higher end is the kiln tail end; the preheater system is arranged at the kiln tail end, comprising a material distribution bin, a preheater body and a material pushing system; a material chute is arranged between a material discharge port at the bottom of the preheater system and an inlet of the rotary kiln; the material cooling system is arranged at the kiln head end, the top of the material cooling system is connected to the outlet of the rotary kiln, and a material discharge port is arranged at the bottom, and a cooler with an external air chamber is arranged in the material cooling system.

[0007] The rotary kiln comprises a kiln body, a kiln head, a kiln tail, a first supporting device, a second supporting device, a propulsion wheel belt, a wheel belt, a large gear ring and a dual-power transmission device; the kiln head, the kiln body and the kiln tail are connected in sequence to form a rotary kiln body; a first supporting device is arranged at one end of the kiln body near the kiln tail, and a second supporting device is arranged at one end of the kiln body near the kiln head; a heavy-duty stopper wheel and a heavy-duty supporting wheel group are arranged on the first supporting device to match the propulsion wheel belt; a heavy-duty supporting wheel group is arranged on the second supporting device to match the wheel belt; a large gear ring is arranged on the kiln body between the first supporting device and the second supporting device and near the first supporting device, and the large gear ring is connected to the dual-power transmission device and transmits power; the dual-power transmission device consists of a driving motor and a diesel engine arranged in parallel.

[0008] The heavy-duty stopper wheel is in rolling contact with the conical surface at the lower end of the propulsion wheel belt, and pushes the propulsion wheel belt through hydraulic drive, so that the propulsion wheel belt moves along the supporting wheel surface of the heavy-duty supporting wheel group, and drives the kiln body to move up and down reciprocatingly; the high end of the propulsion wheel belt on the side opposite to the heavy-duty stopper wheel is provided with an anti-upward movement device; the anti-upward movement device is a blocker, which is set at the highest limit position of the propulsion wheel belt upward movement stroke, and the heavy-duty stopper wheel is provided with a travel switch, and the signal output end of the travel switch is connected to the signal input end of the alarm device.

[0009] The propulsion wheel belt and wheel belt are loosely sleeved on the corresponding positions of the outer ring of the kiln body through the corresponding wheel belt pads; the wheel belt pads include floating pads and blocks; floating pads are respectively arranged at the gap between the propulsion wheel belt and the kiln body and the gap between the wheel belt and the kiln body, the four sides of the floating pads extend out of the propulsion wheel belt or the wheel belt and are provided with blocks, the floating pads are welded and fixed to the blocks, and the blocks are welded and fixed to the kiln body.

[0010] The supporting device 1 and the supporting device 2 are both provided with a jacking screw device, and the jacking screw device is arranged on the outer side of the supporting wheel seat of the corresponding heavy-load supporting wheel group.

[0011] The preheater system includes a distribution bin, a preheater body and a pushing system; the preheater body is composed of an upper ring bin and a lower cone bin; the distribution bin is arranged on the top of the upper ring bin; the upper ring bin is a hollow annular structure, and the interior of the upper ring bin is evenly divided into multiple distribution bins by partitions; the inner wall of the preheater body is provided with a thermal insulation layer; the pushing system is composed of multiple groups of pushing devices, and each group of pushing devices is arranged on the top of the lower cone bin in a one-to-one correspondence with each distribution bin.

[0012] The material cooling system comprises a kiln head collecting cover, a sealing cover, a double-layer grate, a discharge gate, a cooler and a discharging device; the kiln head collecting cover surrounds the kiln head of the rotary kiln, a sealing cover is arranged at the outer end of the kiln head of the rotary kiln, and the kiln head of the rotary kiln and the sealing cover, as well as the sealing cover and the kiln head collecting cover are all sealedly connected; the bottom of the kiln head collecting cover is connected to the cooler through a transition chamber, and a double-layer grate is arranged in the transition chamber; the mesh size of the upper layer of the double-layer grate is larger than the mesh size of the lower layer of the double-layer grate; The grate is inclined, and a discharge gate is arranged on one side of the transition chamber corresponding to the lower end of the double-layer grate; the cooler includes multiple independent cooling spaces, and a discharge port is arranged at the bottom of each cooling space; the discharge device includes multiple vibrating feeders and a central aggregation hopper; the central aggregation hopper is arranged below the cooler corresponding to the center position of the cooler, and multiple discharge ports are connected to the central aggregation hopper through correspondingly arranged vibrating feeders, and a discharge port is arranged at the bottom of the central aggregation hopper; a cooling air inlet is arranged at the bottom of the cooler to connect to the cooling air duct.

[0013] The cooler is a cooler with an external air chamber, including an upper silo, a ring beam, a central air distributor, a chamber air distributor, a lower cone silo and a discharge cone bucket; the upper silo is a vertical silo, the top opening is a material inlet, and the bottom is supported on the ring beam; the central air distributor is arranged at the center of the upper silo, and a plurality of chamber air distributors are arranged on the periphery of the central air distributor, and the central air distributor is arranged higher than the chamber air distributor; the central air distributor is provided with a central wind cone and a central wind ring, and the chamber air distributor The distributor is provided with an air cone and an air ring; a plurality of unloading cone hoppers are connected to the bottom of the upper bin body, and the unloading cone hoppers are arranged one by one corresponding to the chamber air distributors, and a lower cone bin is arranged on the periphery of the unloading cone hoppers; the unloading cone hoppers are composed of multiple sections of cone hoppers, and an annular gap is arranged between two adjacent sections of cone hoppers; the space between the lower cone bin and the unloading cone hopper is divided into multiple air supply chambers, and the air supply chambers are connected with the chamber air distributors; the cooling air duct is connected to the central air distributor through the central air supply pipe, and is connected to the corresponding air supply chambers through multiple air chamber air supply pipes.

[0014] The central air distributor is arranged in the middle of the upper warehouse body and is composed of a central wind cone and a central wind ring. The central wind cone is located above the central wind ring. The central wind cone is composed of a vertical wind duct and a central wind hood fixedly arranged above the vertical wind duct. An annular air outlet is arranged between the central wind hood and the vertical wind duct. The bottom end of the vertical wind duct is connected to the central air supply duct. The central air ring is composed of an annular air duct and an annular wind hood fixedly arranged above the annular air duct. An inner annular air outlet and an outer annular air outlet are arranged between the annular wind hood and the annular air duct. The annular air duct is connected to the vertical air duct through an oblique connecting pipe. The chamber air distributor is arranged at the lower part of the upper warehouse body and is composed of a wind cone, an upper wind ring, a lower wind ring and a bottom cone. The upper wind ring is arranged above the wind cone, and the lower The wind ring is arranged below the wind cone; the wind cone is provided with an annular air outlet, and the upper wind ring and the lower wind ring are both provided with an inner annular air outlet and an outer annular air outlet; the upper wind ring and the lower wind ring are connected by a plurality of vertical connecting pipes, the wind cone is connected to the bottom cone cylinder by a straight pipe, and the straight pipe and the vertical connecting pipe are connected by a plurality of oblique connecting pipes; the bottom cone cylinder is connected to the air supply chamber through an internal transverse air duct; the unloading cone bucket is composed of a top cone bucket, a middle cone bucket and a bottom cone bucket, the bottom of the top cone bucket is inserted into the top of the middle cone bucket for a distance, and the bottom of the middle cone bucket is inserted into the top of the bottom cone bucket for a distance; the top cone bucket and the middle cone bucket, and the middle cone bucket and the bottom cone bucket are respectively connected by a plurality of connecting plates evenly arranged along the circumference.

[0015] A working method of a large rotary kiln system comprises the following steps:

[0016] 1) The raw materials are evenly divided through the material distribution bins and introduced into the corresponding material distribution bins in the preheater body through multiple feeding pipes for preheating;

[0017] 2) The preheated materials are pushed into the material chute by the pushing device in batches, and then transported to the entrance of the rotary kiln by the material chute;

[0018] 3) The tilted rotary kiln is equipped with two-stage support, which transports the materials from the high-end inlet to the low-end outlet through rotation. The materials reaching the outlet are the materials that have completed calcination;

[0019] 4) The calcined material is sent to the material cooling system, the material is naturally discharged from top to bottom and cooled by the cooler, the cooled material is discharged from the discharge pipe at the bottom of the material cooling system, and continuously sent out through the discharge system;

[0020] 5) The cooling air is sent in from the lower part of the material cooling system, passes through the material layer in the cooler from bottom to top, enters the rotary kiln after cooling the material, and then flows from the lower end to the higher end of the rotary kiln, and then enters the preheater system to preheat the material, and finally is discharged through the preheater dust removal system.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Used for calcining active lime or light-burned dolomite; with a large rotary kiln supported by two gears as the core equipment, a preheater system is configured at the front end of the system, and a material cooling system is set at the rear end, together with other related supporting equipment, forming a large rotary kiln system; as an advanced technology leading the green development of the steel industry, it has significant comprehensive benefits and advantages in improving resource utilization, improving lime quality, and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the large rotary kiln system of the present invention.

[0024] Figure 1a yes Figure 1 Partial magnification Figure 1 .

[0025] Figure 1b yes Figure 1 Partial magnification Figure 2 .

[0026] Figure 2 yes Figure 1 and Figure 1a AA view in.

[0027] Figure 3 yes Figure 1 and Figure 1b BB view in.

[0028] Figure 4 It is a front view of the material cooling system of the present invention.

[0029] Figure 5 yes Figure 4 Side view of.

[0030] Figure 6 It is a front view of the cooler described in the present invention.

[0031] Figure 7 yes Figure 6 Side view of.

[0032] In the figure: 1-rotary kiln 1.1-kiln body 1.2-kiln tail 1.3-kiln head 1.4-refractory lining 2-preheater system 2.1-material distribution silo 2.2-material distribution cone 2.3-feeding pipe 2.4-pushing cone 2.5-sliding cone 2.6-sliding inclined surface 3-sliding vehicle 4-support device 1 4.1-heavy-duty supporting wheel group 4.2-heavy-duty blocking wheel 4.3-anti-upward device 4.4-jacking screw device 4.4.1-jacking screw box 4.4.2-jacking screw 4.4.3-nut 4.4.4-bolt 4.5-wheel belt pad 4 .5.1-Floating pad 4.5.2-Block 5-Propelling wheel belt 6-Giant gear ring 7-Dual power transmission device 8-Support device 2 8.1-Heavy load support wheel group 8.2-Top screw device 8.2.1-Top screw box 8.2.2-Top screw 8.2.3-Nut 8.2.4-Bolt 8.3-Wheel belt pad 8.3.1-Floating pad 8.3.2-Block 9-Wheel belt 10-Material cooling system 10.1-Kiln head collecting cover 10.2-Sealing cover 10.3-Double layer grate 10.4-Discharging gate 10.4.1-Discharging gate 10.4.2-Electro-hydraulic push rod 10.4.3-Counterweight 10.5-Cooler 10.5.1-Upper silo 10.5.2-Refractory insulation layer 10.5.3-Central air distributor 10.5.4-Chamber air distributor 10.5.5-Lower cone silo 10.5.6-Unloading cone hopper 10.5.7-Internal transverse air duct 10.5.8-Air supply chamber 10.6-Discharging device 10.6.1-Central aggregate hopper 10.6.2-Vibrating feeder 11.1-Cooling air system 11.2-Combustion Air system 12.1-Feeding system 12.2-Discharging system 13-Combustion system 14-Pulverized coal storage and transportation system 15.1-Heavy-duty wheel hydraulic system 15.2-Preheater hydraulic system 16.1-Heavy-duty wheel cooling water system 16.2-Hydraulic station cooling water system 17.1-Kiln head cooling fan 17.2-Kiln tail cooling fan 18.1-Preheater dust removal system 18.2-Cooler dust removal system 19.1-Preheater material recovery system 19.2-Cooler material recovery system 20-Temperature, pressure detection and control system DETAILED DESCRIPTION

[0033] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0034] like Figure 1 , Figure 1a , Figure 1bAs shown, a large rotary kiln system described in the present invention comprises a rotary kiln 1, a preheater system 2, a material chute 3 and a material cooling system 10; the rotary kiln 1 is provided with two-stage support, and the kiln body 1.1 of the rotary kiln is tilted, with the lower end being the kiln head end and the higher end being the kiln tail end; the preheater system 2 is provided at the kiln tail end, and comprises a material distribution bin 2.1, a preheater body and a pushing system; a material chute 3 is provided between the discharge port at the bottom of the preheater system 2 and the rotary kiln entrance; the material cooling system 10 is provided at the kiln head end, the top of the material cooling system 10 is connected to the rotary kiln outlet, and the bottom is provided with a discharge port, and a cooler 10.5 with an external air chamber is provided in the material cooling system 10.

[0035] The rotary kiln 1 comprises a kiln body 1.1, a kiln head 1.3, a kiln tail 1.2, a support device 1 4, a support device 2 8, a propulsion belt 5, a belt 9, a large gear ring 6 and a dual power transmission device 7; the kiln head 1.3, the kiln body 1.1 and the kiln tail 1.2 are sequentially connected to form a rotary kiln body; a support device 1 4 is arranged at one end of the kiln body 1.1 near the kiln tail 1.2, and a support device 2 8 is arranged at one end of the kiln body 1.1 near the kiln head 1.3; Figure 2 As shown, the support device 1 4 is provided with a heavy-duty blocking wheel 4.2 and a heavy-duty supporting wheel group 4.1, which cooperate with the propulsion wheel belt 5; Figure 3 As shown, the supporting device 2 8 is provided with a heavy-duty supporting wheel group 8.1 matched with the wheel belt 9; a large gear ring 6 is provided between the supporting device 1 4 and the supporting device 2 8 and on the kiln body 1.1 close to the supporting device 1 4, and the large gear ring 6 is connected to the dual power transmission device 7 and transmits power; the dual power transmission device 7 is composed of a driving motor and a diesel engine arranged in parallel.

[0036] The heavy-duty stopper wheel 4.2 is in rolling contact with the conical surface at the lower end of the propulsion wheel belt 5, and pushes the propulsion wheel belt 5 through hydraulic drive, so that the propulsion wheel belt 5 moves along the supporting roller surface of the heavy-duty supporting roller group 4.1, and drives the kiln body 1.1 to move up and down reciprocatingly; the high end of the propulsion wheel belt 5 on the side opposite to the heavy-duty stopper wheel 4.2 is provided with an anti-upward device 4.3; the anti-upward device 4.3 is a blocker, which is arranged at the highest limit position of the upward travel of the propulsion wheel belt 5; the heavy-duty stopper wheel 4.2 is provided with a travel switch, and the signal output end of the travel switch is connected to the signal input end of the alarm device.

[0037] The propulsion belt 5 and the belt 9 are loosely sleeved on the corresponding positions of the outer ring of the kiln body 1.1 through the corresponding belt pads 4.5; the belt pads 4.5 include floating pads 4.5.1 and blocks 4.5.2; floating pads 4.5.1 are respectively arranged at the gap between the propulsion belt 5 and the kiln body 1.1 and the gap between the belt 9 and the kiln body 1.1, the four sides of the floating pads 4.5.1 extend out of the propulsion belt 5 or the belt 9 respectively and are provided with blocks 4.5.2, the floating pads 4.5.1 and the blocks 4.5.2 are welded and fixed, and the blocks 4.5.2 and the kiln body 1.1 are welded and fixed.

[0038] The supporting device 1 4 and the supporting device 2 8 are both provided with a jacking screw device (4.4 or 8.2), and the jacking screw device (4.4 or 8.2) is arranged on the outer side of the supporting roller seat of the corresponding heavy-load supporting roller group (4.1 or 8.1).

[0039] The preheater system 2 includes a distribution bin 2.1, a preheater body and a pushing system; the preheater body is composed of an upper ring bin and a lower conical bin; the distribution bin 2.1 is arranged on the top of the upper ring bin; the upper ring bin is a hollow annular structure, and the interior of the upper ring bin is evenly divided into multiple distribution bins by partitions; the inner wall of the preheater body is provided with a thermal insulation layer; the pushing system is composed of multiple groups of pushing devices, and each group of pushing devices is arranged on the top of the lower conical bin in a one-to-one correspondence with each distribution bin.

[0040] like Figure 4 , Figure 5 As shown, the material cooling system 10 comprises a kiln head material collecting cover 10.1, a sealing cover 10.2, a double-layer grate 10.3, a discharge gate 10.4, a cooler 10.5 and a discharging device 10.6; the kiln head material collecting cover 10.1 surrounds the kiln head 1.3 of the rotary kiln 1, and a sealing cover 10.2 is arranged at the outer end of the kiln head 1.3 of the rotary kiln 1, and the kiln head 1.3 of the rotary kiln 1 and the sealing cover 10.2, and the sealing cover 10.2 and the kiln head material collecting cover 10.1 are all sealedly connected; the bottom of the kiln head material collecting cover 10.1 is connected to the cooler 10.5 through a transition chamber, and a double-layer grate 10.3 is arranged in the transition chamber; the mesh size of the upper layer of the double-layer grate 10.3 is larger than the mesh size of the lower layer of the grate The double-layer grate 10.3 is tilted, and a discharge gate 10.4 is provided on one side of the transition chamber corresponding to the lower end of the double-layer grate 10.3; the cooler 10.5 includes a plurality of independent cooling spaces, and a discharge port is provided at the bottom of each cooling space; the discharge device 10.6 includes a plurality of vibrating feeders 10.6.2 and a central aggregation hopper 10.6.1; the central aggregation hopper 10.6.1 is provided below the cooler 10.5 corresponding to the central position of the cooler 10.5, and a plurality of discharge ports are connected to the central aggregation hopper 10.6.1 through the correspondingly provided vibrating feeders 10.6.2, and a discharge port is provided at the bottom of the central aggregation hopper 10.6.1; a cooling air inlet is provided at the bottom of the cooler 10.5 to connect to the cooling air duct.

[0041] like Figure 6 , Figure 7As shown, the cooler 10.5 is a cooler with an external air chamber, including an upper silo 10.5.1, a ring beam, a central air distributor 10.5.3, a chamber air distributor 10.5.4, a lower cone silo 10.5.5 and a discharge cone hopper 10.5.6; the upper silo 10.5.1 is a vertical silo, the top opening is a material inlet, and the bottom is supported on the ring beam; the central air distributor 10.5.3 is arranged at the center of the upper silo 10.5.1, and a plurality of chamber air distributors 10.5.4 are arranged on the periphery of the central air distributor 10.5.3, and the central air distributor 10.5.3 is arranged higher than the chamber air distributor 10.5.4; the central air distributor 10.5.3 is provided with a central wind cone and a central wind ring, and the chamber air distributor 1 0.5.4 is provided with a wind cone and an air ring; the bottom of the upper bin body 10.5.1 is connected with a plurality of unloading cone hoppers 10.5.6, the unloading cone hoppers 10.5.6 are arranged one by one with the chamber air distributor 10.5.4, and a lower cone bin 10.5.5 is arranged on the periphery of the unloading cone hopper 10.5.6; the unloading cone hopper 10.5.6 is composed of a plurality of sections of cone hoppers, and an annular gap is arranged between two adjacent sections of cone hoppers; the space between the lower cone bin 10.5.5 and the unloading cone hopper 10.5.6 is divided into a plurality of air supply chambers 10.5.8, and the air supply chambers 10.5.8 are communicated with the chamber air distributor 10.5.4; the cooling air duct is connected to the central air distributor 10.5.3 through a central air supply pipe, and is connected to the corresponding air supply chambers 10.5.8 through a plurality of air chamber air supply pipes.

[0042] The central air distributor 10.5.3 is arranged in the middle of the upper warehouse body 10.5.1, and is composed of a central wind cone and a central wind ring. The central wind cone is located above the central wind ring; the central wind cone is composed of a vertical air duct and a central wind hood fixedly installed above the vertical air duct, and a circular air outlet is arranged between the central wind hood and the vertical air duct, and the bottom end of the vertical air duct is connected to the central air supply duct; the central air ring is composed of an annular air duct and an annular wind hood fixedly installed above the annular air duct, and an inner annular air outlet and an outer annular air outlet are arranged between the annular wind hood and the annular air duct; the annular air duct is connected to the vertical air duct through an oblique connecting pipe; the chamber air distributor 10.5.4 is arranged at the lower part of the upper warehouse body 10.5.1, and is composed of a wind cone, an upper wind ring, a lower wind ring and a bottom cone; the upper wind ring is arranged above the wind cone The lower wind ring is arranged below the wind cone; the wind cone is provided with an annular air outlet, and the upper wind ring and the lower wind ring are provided with an inner annular air outlet and an outer annular air outlet; the upper wind ring and the lower wind ring are connected by a plurality of vertical connecting pipes, the wind cone is connected to the bottom cone cylinder by a straight pipe, and the straight pipe and the vertical connecting pipe are connected by a plurality of oblique connecting pipes; the bottom cone cylinder is connected to the air supply chamber 10.5.8 through an internal transverse air duct 10.5.7; the unloading cone bucket 10.5.6 is composed of a top cone bucket, a middle cone bucket and a bottom cone bucket, the bottom of the top cone bucket is inserted into the top of the middle cone bucket for a distance, and the bottom of the middle cone bucket is inserted into the top of the bottom cone bucket for a distance; the top cone bucket and the middle cone bucket, and the middle cone bucket and the bottom cone bucket are respectively connected by a plurality of connecting plates evenly arranged along the circumference.

[0043] A working method of a large rotary kiln system comprises the following steps:

[0044] 1) The raw materials are evenly divided through the material distribution bin 2.1 and introduced into the corresponding material distribution bins in the preheater body through multiple feed pipes 2.3 for preheating;

[0045] 2) The preheated materials are pushed into the material slide car 3 in batches by the material pusher, and then transported to the entrance of the rotary kiln by the material slide car 3;

[0046] 3) The tilted rotary kiln 1 is provided with two-stage supports, and the materials are sent from the high-end inlet to the low-end outlet through rotation, and the materials reaching the outlet are the materials that have completed calcination;

[0047] 4) The calcined material is fed into the material cooling system 10, the material is naturally fed from top to bottom and cooled by the cooler 10.5, the cooled material is discharged from the discharge pipe at the bottom of the material cooling system 10, and is continuously fed out through the discharge system 12.2;

[0048] 5) The cooling air is fed into the material cooling system 10 from the bottom, passes through the material layer in the cooler 10.5 from bottom to top, cools the material and enters the rotary kiln 1, then flows from the lower end to the higher end of the rotary kiln 1, and then enters the preheater system 2 to preheat the material, and finally is discharged through the preheater dust removal system 18.1.

[0049] The following embodiments are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0050] [Example]

[0051] like Figure 1 , Figure 1a , Figure 1b As shown, in this embodiment, a large rotary kiln system is used to calcine active lime or light-burned dolomite, with a large rotary kiln supported by two gears as the core equipment, and also includes other related systems, such as a preheater system 2, a material cooling system 10, a hydraulic system, a cooling water system, a coal powder storage and transportation system 14, an air cooling system, a ventilation system, a dust removal system, a combustion system 13, a conveying system, a material recovery system, and a temperature, pressure detection and control system 20, etc.

[0052] The two-stage support rotary kiln 1 mainly comprises: a kiln body 1.1, a kiln head 1.3, a kiln tail 1.2 and two-stage supports, such as Figure 2 , Figure 3 As shown, the two-stage support is respectively a support device 1 4 with a heavy-duty stopper wheel 4.2 and a support device 2 8 without a stopper wheel. The propulsion belt 5 is installed in conjunction with the support device 1 4, and the belt 9 is installed in conjunction with the support device 2 8. The support device 1 4 and the support device 2 8 both include a heavy-duty support wheel group 4.1 and a top screw device 4.4, and the rotary kiln 1 also includes a belt pad 4.5, a dual power transmission device 7 and a large gear ring 6, etc.

[0053] The various components of the large rotary kiln system are installed with the rotary kiln body 1.1 at an angle, that is, there are high and low ends. The two ends of the kiln body 1.1 are the kiln head end and the kiln tail end, respectively, of which the low end is the kiln head end and the high end is the kiln tail end. The kiln body 1.1 is supported on the support device 1 4 and the support device 2 8 through the propulsion belt 5 and the belt 9 respectively. The propulsion belt 5 and the belt 9 are loosely sleeved on the corresponding positions of the outer ring of the kiln body through the corresponding belt pads (4.5 or 8.3), and are supported on the corresponding heavy-duty support wheel group (4.1 or 8.1). The support device 1 4 with the heavy-duty stopper wheel 4.2 and the propulsion belt 5 are arranged at the high end of the kiln body 1.1, and the support device 2 8 and the belt 9 are arranged at the low end of the kiln body 1.1.

[0054] The dual-power transmission device 7 and the large gear ring 6 are arranged between the two-speed supports, close to one side of the support device 1.4. The large gear ring 6 is driven by the dual-power transmission device 7 to drive the kiln body 1.1 to rotate. The heavy-duty stopper wheel 4.2 is specially used for large rotary kilns with two-speed supports. It and the anti-upward movement device 4.3 are respectively arranged on both sides of the bottom of the propulsion belt 5, that is, respectively located at the low end and high end of the propulsion belt 5, and are used to control the movement of the propulsion belt 5 along the axis of the rotary kiln 1. The heavy-duty stopper wheel 4.2 is in rolling contact with the low-end conical surface of the propulsion belt 5, and pushes the propulsion belt 5 through hydraulic drive, so that the propulsion belt 5 moves along the supporting roller surface of the heavy-duty supporting roller group 4.1, and drives the kiln body 1.1 to reciprocate and move up and down slightly. The anti-upward movement device 4.3 is arranged at the high end of the propulsion belt 5, at the end of the upward movement of the propulsion belt 5, and is used to prevent the kiln body 1.1 from moving up over the travel. During normal operation, the anti-upward movement device 4.3 does not contact the end surface of the propulsion wheel belt 5. If there is contact, it indicates that the kiln body 1.1 has reached the upper limit and needs to be adjusted.

[0055] The side of the propulsion belt 5 is provided with a retaining bar for fixing it axially along the center of the rotary kiln 1, that is, the propulsion belt 5 and the rotary kiln 1 can move axially together and can rotate relatively. When the heavy-duty retaining wheel 4.2 pushes the propulsion belt 5 axially along the rotary kiln 1 under the action of the hydraulic system, it can drive the kiln body 1.1 of the rotary kiln to move axially together. The propulsion belt 5 is supported on the supporting wheel of the heavy-duty supporting wheel group 4.1. Due to the limited width of the supporting wheel, the axial movement of the rotary kiln 1 is very small, generally about 50 mm. This movement is mainly used to prevent the propulsion belt 5 from always rotating at the same place on the supporting wheel and causing serious wear. The heavy-duty retaining wheel 4.2 is equipped with a travel switch that can trigger an alarm. Under normal circumstances, the rotary kiln will only move downward under the action of gravity. Basically, the propulsion belt 5 is against the corresponding heavy-duty retaining wheel 4.2 and moves with the heavy-duty retaining wheel 4.2. However, some rotary kilns may move toward the high end along the axis. If the amount of movement is large, the propulsion belt 5 will separate from the corresponding supporting wheel, so it is necessary to set an anti-upward movement device 4.3 to block it.

[0056] In this embodiment, the aspect ratio (ratio of length to diameter) of the kiln body 1.1 is 12 to 15. The kiln body 1.1 is cantilevered to a certain length at the outer ends of the two supports to form cantilever counterweights to balance the stress at various locations of the kiln body. Among them, the cantilever length at the kiln head end (the lower end of the kiln body) is slightly shorter than that at the kiln tail end (the upper end of the kiln body).

[0057] The loads of the support device 1 4 and the support device 2 8 are borne by the corresponding heavy-duty roller groups 4.1 and 8.1 and the top screw devices 4.4 and 8.2 respectively. The kiln body 1.1 is supported on the corresponding heavy-duty roller groups 4.1 and 8.1 through the propulsion belt 5 and the belt 9. Each group of heavy-duty roller groups not only bears the vertical downward load, but also bears the lateral outward thrust load of the kiln body 1.1. The top screw devices 4.4 and 8.2 are used to bear the lateral outward thrust load (this load reaches several hundred tons). The top screw devices 4.4 and 8.2 and the heavy-duty roller groups 4.1 and 8.1 are all installed on the upper part of the bottom bracket of the support device 1 4 or the support device 2 8. The top screw devices 4.4 and 8.2 can support the heavy-duty roller groups 4.1 and 8.1 to prevent them from moving outward laterally. In this embodiment, the top screw device 4.4 is composed of a top screw box 4.4.1, a top screw 4.4.2, a bolt 4.4.3 and a nut 4.4.4, and the top screw device 8.2 is composed of a top screw box 4.4.1, a top screw 8.2.2, a bolt 8.2.3 and a nut 8.2.4. A groove is provided on the upper part of the bottom bracket, and the lower part of the top screw box is embedded in the groove. The bottom of the end plate of the top screw box away from the kiln body is supported by the groove frame, and the top screw is inserted through the hole on the end plate close to the kiln body. The top screw is locked by two nuts provided on both sides of the end plate, and the top screw head is on the outer end surface of the bearing seat of the heavy-duty support roller assembly. The bottom of the top screw box is fixedly connected to the bottom bracket by bolts. The outward thrust load borne by the heavy-duty support roller assembly is transmitted to the top screw box by the top screw, and then to the bottom bracket, and then to the concrete foundation.

[0058] The floating pad (4.5.1 or 8.3.1) in the wheel pad (4.5 or 8.3) is indirectly fixed to the kiln body 1.1. The floating pad (4.5 or 8.3) located in the gap between the propulsion wheel band 5 (or wheel band 9) and the kiln body 1.1 is not directly welded to the kiln body 1.1, but blocks (4.5.2 or 8.3.2) are arranged outside the four sides of the floating pad (4.5 or 8.3) extending out of the propulsion wheel band 5 (or wheel band 9), the contact area between the floating pad and the block is welded, and the block is welded to the kiln body, so that the floating pad is indirectly fixed to the kiln body. This structure can prevent the kiln body under the propulsion wheel band (or wheel band) from being deformed or internally stressed due to welding.

[0059] Taking the installation of the wheel band 9 as an example, the wheel band 9 is sleeved on the outside of the kiln body 1.1 through the floating pad 8.3.1, and is also provided with a block 8.3.2, an end baffle, a wheel band side baffle, a side baffle block and an adjustment device (including an adjustment block and an adjustment bolt). A plurality of floating pads 8.3.1 are evenly arranged in the gap between the wheel band 9 and the kiln body 1.1. When the kiln body 1.1 rotates, the wheel band 9 rotates on the supporting wheel together with the floating pad 8.3.1 under the action of friction, and the load of the entire kiln body 1.1 is transmitted to the supporting wheel. The floating pad 8.3.1 is attached to the outer surface of the kiln body 1.1 and is not welded to the kiln body 1.1, so it is called a floating pad. Because it is not directly welded to the kiln body 1.1, it can naturally extend with the thermal expansion of the kiln body 1.1, which not only significantly reduces the welding stress of the kiln body 1.1, but also significantly reduces the thermal stress generated by thermal expansion. However, the floating pad 8.3.1 also needs to be fixed, specifically, it is indirectly fixed to the outer surface of the kiln body 1.1 through the baffles 8.3.2 and end baffles arranged around it and directly welded to the kiln body. After the wheel band 9 is put on the floating pad 8.3.1, it is axially positioned by the wheel band side baffles arranged on both sides. The wheel band side baffles are also indirectly fixed to the floating pad 8.3.1 through the side baffle baffle blocks. The wheel band 9 can move slightly axially between the wheel band side baffles on both sides. The floating pad 8.3.1 and the wheel band side baffles are arranged in an alternating staggered manner to ensure that stress is fully released and reduce jamming and wear.

[0060] The material distribution bin 2.1 on the upper part of the preheater system 2 is arranged above the feed port of the rotary kiln. The raw materials are evenly distributed after passing through the material distribution bin 2.1 and introduced into a plurality of feed pipes 2.3; the feed pipes 2.3 are connected to the various material distribution bins of the preheater body, and the materials enter the various material distribution bins in the preheater body through the feed pipes 2.3 for preheating. The preheated materials are pushed to the lower material chute 3 in batches by the pushing device; the chute 3 is arranged between the preheater system 2 and the rotary kiln entrance, and is used to transport the materials in the preheater body to the rotary kiln entrance; the inclined rotary kiln 1 rotates to send the materials from the high-end entrance to the low-end exit, and the materials arriving at the exit are the materials that have completed calcination. The high-temperature materials that have completed calcination are sent to the material cooling system 10, which is naturally discharged from top to bottom and cooled by the cooler 10.5. The cooled materials are discharged from the discharge pipe at the bottom of the material cooling system 10 and continuously sent out through the discharge system 12.2.

[0061] In this embodiment, the preheater system 2 includes a distribution bin 2.1, a preheater body, a pushing system, a circular walkway and a support system; the preheater body is composed of an upper ring bin and a lower conical bin; the distribution bin 2.1 is arranged on the top of the upper ring bin; the upper ring bin is a hollow ring structure, and the interior of the upper ring bin is evenly divided into multiple distribution bins by partitions; the inner wall of the preheater body is provided with a thermal insulation layer; the pushing system is composed of multiple groups of pushing devices, and each group of pushing devices is arranged on the top of the lower conical bin in a one-to-one correspondence with each distribution bin; a circular walkway is arranged on the lower outer side of the preheater body; the support system is a three-dimensional space support system arranged along the height of the preheater body and composed of multiple layers of steel structure supports.

[0062] The pushing device is composed of a hydraulic cylinder, a heat-resistant pushing trolley, a guide pulley and a roller; the hydraulic cylinder is arranged on the outside of the preheater body, and the axis of the hydraulic cylinder is parallel to the bottom surface of the upper pushing cone; the push rod of the hydraulic cylinder is connected to the heat-resistant pushing trolley through the guide pulley, and the heat-resistant pushing trolley is arranged in the pushing space in the preheater body, and the pushing space is connected to the internal space of the upper pushing cone; when the push rod of the hydraulic cylinder drives the heat-resistant pushing trolley to move toward the inside of the preheater body, the bottom of the heat-resistant pushing trolley rolls with the bottom surface of the upper pushing cone through the roller.

[0063] The preheater system 2 is provided with multiple layers of discharge cones, and the discharge is carried out by external drive combined with gravity discharge. The material located at the push cone surface 2.4 is driven by the push device to move downward along the cone surface, and drives the material located above and below it to flow by gravity, forming a continuous material discharge system. First, the material is driven by the push device on the push cone surface 2.4 set in the preheater body and is pushed to the material flow cone surface 2.5 in the lower cone bucket, and automatically falls into the material flow cart 3 along the cone surface, and then slides to the entrance of the rotary kiln through the material flow inclined surface 2.6 in the material flow cart 3; secondly, when the material on the push cone surface 2.4 is pushed downward, the material in the inverted cone bin set in the upper end material distribution bin 2.1 automatically fills the gap downward along the material distribution cone surface 2.2. After the above links are completed, the material discharge process in front of the kiln is realized.

[0064] like Figure 4 , Figure 5As shown, in this embodiment, the material cooling system 10 includes a kiln head collecting cover 10.1, a sealing cover 10.2, a double-layer grate 10.3, a discharge gate 10.4, a cooler 10.5 and a discharging device 10.6; the kiln head collecting cover 10.1 is arranged at the discharging end of the rotary kiln 1, and the kiln head 1.3 of the rotary kiln is surrounded therein, and the sealing cover 10.2 is arranged at the outer end of the kiln head 1.3 of the rotary kiln, and the kiln head 1.3 of the rotary kiln and the sealing cover 10.2, and the sealing cover 10.2 and the kiln head collecting cover 10.1 are all sealedly connected; the bottom of the kiln head collecting cover 10.1 is connected to the cooler 10.5 through a transition chamber, and the double-layer grate 10.3 is arranged in the transition chamber; the mesh size of the upper layer of the double-layer grate 10.3 is larger than the mesh size of the lower layer; The double-layer grate 10.3 is inclined, and a discharge gate 10.4 is provided on one side of the transition chamber corresponding to the lower end of the double-layer grate 10.3; the cooler 10.5 includes a plurality of independent cooling spaces, and a discharge port is provided at the bottom of each cooling space; the discharge device 10.6 includes a plurality of vibrating feeders 10.6.2 and a central aggregation hopper 10.6.1; the central aggregation hopper 10.6.1 is provided below the cooler 10.5 corresponding to the central position of the cooler 10.5, and a plurality of discharge ports are connected to the central aggregation hopper 10.6.1 through the correspondingly provided vibrating feeders 10.6.2, and a discharge port is provided at the bottom of the central aggregation hopper 10.6.1 to connect to the discharge system 12.2; a cooling air inlet is provided at the bottom of the cooler 10.5 to connect to the cooling air system 11.1.

[0065] The double-layer grate 10.3 includes an upper grate assembly and a lower grate assembly, the upper grate assembly is composed of an upper grate, a high-end bracket, a low-end bracket and a middle bracket; the lower grate assembly is composed of a lower grate, a support beam and a support beam cooling air duct; the high end of the upper grate is connected to the corresponding side warehouse wall of the transition chamber through the high-end bracket, and the low end of the upper grate is connected to the corresponding side warehouse wall of the transition chamber through the low-end bracket; the lower grate is supported by the support beam, and the two ends of the support beam are respectively connected to the corresponding end warehouse walls of the transition chamber; the middle part of the upper grate is connected to the support beam through the middle bracket; one end of the support beam cooling air duct is connected to the cooling fan arranged outside the transition chamber, and the other end extends to the support beam and has a plurality of air outlets.

[0066] The discharge gate 10.4 is composed of a closed gate body, a discharge gate 10.4.1, an electro-hydraulic push rod 10.4.2, a counterweight 10.4.3 and a hanger; the closed gate body is arranged in parallel with the double-layer grate 10.3 and is suspended on the outer side of the transition chamber by the hanger; the discharge gate 10.4.1 is arranged in the closed gate body, and a counterweight 10.4.3 is arranged on the discharge gate 10.4.1. Under the action of the counterweight 10.4.3, the discharge gate The door 10.4.1 is in a closed state; an electro-hydraulic push rod 10.4.2 is also provided between the discharge gate 10.4.1 and the closed gate body, and a pressure sensor is provided on the discharge gate 10.4.1. The pressure sensor is interlocked with the electro-hydraulic push rod 10.4.2 for control. When the monitoring value of the pressure sensor is greater than the set discharge pressure value, the electro-hydraulic push rod 10.4.2 overcomes the load of the counterweight block 10.4.3 to open the discharge gate 10.4.1.

[0067] like Figure 6 , Figure 7 As shown, the cooler 10.5 comprises an upper silo 10.5.1, a ring beam, a central air distributor 10.5.3, a compartment air distributor 10.5.4, a lower cone silo 10.5.5 and a discharge cone hopper 10.5.6; the upper silo 10.5.1 is a vertical silo, the silo wall is provided with a refractory insulation layer 10.5.2, the top opening is a material inlet, and the bottom is supported on the ring beam; the central air distributor 10.5.3 is arranged at the center of the upper silo 10.5.1, and a plurality of compartment air distributors 10.5.4 are arranged on the periphery of the central air distributor 10.5.3, and the central air distributor 10.5.3 is arranged higher than the compartment air distributor 10.5.4; the central air distributor 10.5.3 is provided with a central wind cone and a central wind ring, and the compartment air distributor 10. 5.4 is provided with a wind cone and an air ring; the bottom of the upper bin body 10.5.1 is connected with a plurality of unloading cone hoppers 10.5.6, the unloading cone hoppers 10.5.6 are arranged one by one with the chamber air distributor 10.5.4, and a lower cone bin 10.5.5 is arranged on the periphery of the unloading cone hopper 10.5.6; the unloading cone hopper 10.5.6 is composed of a plurality of sections of cone hoppers, and an annular gap is arranged between two adjacent sections of cone hoppers; the space between the lower cone bin 10.5.5 and the unloading cone hopper 10.5.6 is divided into a plurality of air supply chambers 10.5.8, and the air supply chambers 10.5.8 are communicated with the chamber air distributor 10.5.4; the cooling air duct in the cooling air system 11.1 is connected to the central air distributor 10.5.3 through a central air supply pipe, and is connected to the corresponding air supply chambers 10.5.8 through a plurality of air chamber air supply pipes.

[0068] The central air distributor 10.5.3 is arranged in the middle of the upper warehouse body 10.5.1, and is composed of a central wind cone and a central wind ring. The central wind cone is located above the central wind ring; the central wind cone is composed of a vertical air duct and a central wind hood fixedly installed above the vertical air duct, and an annular air outlet is arranged between the central wind hood and the vertical air duct, and the bottom end of the vertical air duct is connected to the central air supply duct; the central air ring is composed of an annular air duct and an annular wind hood fixedly installed above the annular air duct, and an inner annular air outlet and an outer annular air outlet are arranged between the annular wind hood and the annular air duct; the annular air duct is connected to the vertical air duct through an oblique connecting pipe.

[0069] The chamber air distributor 10.5.4 is arranged at the lower part of the upper warehouse body 10.5.1, and is composed of a wind cone, an upper wind ring, a lower wind ring and a bottom cone; the upper wind ring is arranged above the wind cone, and the lower wind ring is arranged below the wind cone; the wind cone is provided with an annular air outlet, and the upper wind ring and the lower wind ring are both provided with an inner annular air outlet and an outer annular air outlet; the upper air ring and the lower air ring are connected by a plurality of vertical connecting pipes, the wind cone is connected to the bottom cone by a straight pipe, and the straight pipe and the vertical connecting pipe are connected by a plurality of oblique connecting pipes; the bottom cone is connected to the air supply chamber 10.5.8 through an internal transverse air duct 10.5.7.

[0070] The unloading cone bucket 10.5.6 consists of a top cone bucket, a middle cone bucket and a bottom cone bucket. The bottom of the top cone bucket is inserted into the top of the middle cone bucket for a distance, and the bottom of the middle cone bucket is inserted into the top of the bottom cone bucket for a distance. The top cone bucket and the middle cone bucket, and the middle cone bucket and the bottom cone bucket are respectively connected by multiple connecting plates evenly arranged along the circumference; a discharge pipe is arranged at the bottom of the bottom cone bucket.

[0071] In this embodiment, the upper bin body 10.5.1 is a square bin body, and the chamber air distributors 10.5.3 are four arranged at the four corners of the upper bin body 10.5.1, and the unloading cone hoppers 10.5.6 are four correspondingly arranged; the lower cone bin 10.5.5 is a square cone bin, and the lower cone bin 10.5.5 is provided with a cross partition and a diagonal partition, which divides the space between the lower cone bin 10.5.5 and the unloading cone hopper 10.5.6 into 8 separated air supply chambers.

[0072] The cooling air is fed into the lower part of the cooler 10.5, passes through the material layer in the cooler 10.5 from bottom to top and cools the material, then enters the rotary kiln 1, flows to the high end through the lower end of the rotary kiln 1, then enters the preheater body to preheat the material, and finally is discharged by the preheater dust removal system 18.1.

[0073] The hydraulic system drives the corresponding equipment through hydraulic power and is centrally placed and uniformly managed. In this embodiment, the hydraulic system includes a heavy-duty wheel stopper hydraulic system 15.1 and a preheater system hydraulic system 15.2.

[0074] The cooling water system is used to continuously and quantitatively deliver cooling water to multiple devices in a large rotary kiln system to ensure the normal operation of the equipment. In this embodiment, the cooling water system mainly includes a heavy-duty roller cooling water system 16.1 and a hydraulic station cooling water system 16.2 in the hydraulic system.

[0075] In this embodiment, the large rotary kiln system uses pulverized coal as fuel, so a pulverized coal storage and transportation system 14 is provided to store and transport the pulverized coal, wherein the pulverized coal bin serves as the main equipment for storing and transporting the pulverized coal.

[0076] The air cooling system is used to continuously supply air to cool the parts of the large rotary kiln system that are prone to temperature rise. In this embodiment, the air cooling system includes a kiln head cooling fan 17.1 and a kiln tail cooling fan 17.2.

[0077] The ventilation system is used to blow air into the cooler to provide cooling air for material cooling, and to provide combustion air for combustion to the combustion system 13. In this embodiment, the ventilation system includes a cooling air system 11.1 and a combustion air system 11.2.

[0078] In this embodiment, the dust removal system includes a preheater dust removal system 18.1 and a cooler dust removal system 18.2 at the outlet of the material cooling system. The combustion system 13 includes a burner and a burner adjustment device. The conveying system is used to feed the raw materials into the material bin and transport the materials discharged from the material cooling system after calcination to the finished product bin, that is, it includes a feeding system 12.1 and a discharging system 12.2. The material recovery system is used to centrally process the materials brought out by the moving parts of the rotary kiln 1, or return them to the inside of the equipment, including a preheater material recovery system 19.1 and a cooler material recovery system 19.2.

[0079] The temperature, pressure detection and control system 20 is a key element for realizing automatic control of a large rotary kiln system. In this embodiment, temperature, pressure and other detection elements are arranged at various important parts of the large rotary kiln system. Except for the material distribution silo, the equipment involved in the material calcination, including the rotary kiln body, the preheater body, the chute car, the upper silo of the cooler and other equipment, have refractory materials built on the inner walls.

[0080] In this embodiment, the dual power transmission device 7 is composed of a driving motor and a diesel engine connected in parallel. The motor or the diesel engine can be used to drive the rotary kiln depending on the situation. The speeds of the two are different, and the speed of the rotary kiln driven by the diesel engine is lower.

[0081] In a large rotary kiln system, the internal sealing between each device is achieved through material sealing. The feed pipe 2.3 in the preheater system 2 and the discharge pipe of the material cooling system 10 are both material channels and distribution pipes, as well as sealing pipes. The feed pipe not only serves as a distribution pipe to evenly distribute the material to each distribution bin of the preheater system, but also as a sealing pipe to seal the high-temperature preheater system bin body and the normal-temperature distribution bin through material sealing; by the same token, the discharge pipe of the material cooling system not only evenly distributes the material in the upper bin body of the material cooling system to each feed cone bucket for sufficient cooling, but also serves as a sealing pipe to seal the high-temperature upper bin body from the outside through material sealing.

[0082] The composition and specific structure of the large rotary kiln system of the present invention are related to a part of the prior art, such as the "new rotary kiln support device" disclosed in the Chinese patent application with publication number CN101408373A, the "a new box-type hydraulic wheel blocking device" disclosed in the Chinese patent application with publication number CN109186252A, the "a preheater system with multi-layer steel structure support" disclosed in the Chinese patent application with publication number CN114234624A, the "a weighing type pulverized coal bin for a large rotary kiln" disclosed in the Chinese patent application with publication number CN114368556A, and the "a new type of rotary kiln support device" disclosed in the Chinese patent application with publication number CN109210529A. The present invention relates to "a multi-directional adjustable burner regulator" disclosed in the Chinese patent application with publication number CN110425868A, "a rotary kiln secondary air supply device" disclosed in the Chinese patent application with publication number CN109026864A, "a novel hydraulic device for controlling the baffle wheel", etc.; it also involves several other patents applied for on the same day, such as "a low-stress rotary kiln wheel belt device and installation method", "a material cooling system for a large rotary kiln" and "a rotary kiln cooler with an external air chamber"; the devices or structures not particularly described in this embodiment all adopt the existing conventional technology or the technical solutions disclosed in the above-mentioned references.

[0083] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A large rotary kiln system, characterized in that: It includes a rotary kiln, a preheater system, a material chute and a material cooling system; the rotary kiln includes a kiln body, a kiln head, a kiln tail, a support device 1, a support device 2, a propulsion wheel belt, a wheel belt, a large gear ring and a dual-power transmission device; the kiln head, the kiln body and the kiln tail are connected in sequence to form a rotary kiln body; the rotary kiln is provided with two-stage support, and the kiln body of the rotary kiln is tilted, the lower end is the kiln head end, and the higher end is the kiln tail end; the preheater system is arranged at the kiln tail end, including a material distribution bin, a preheater body and a material pushing system; a material chute is arranged between the discharge port at the bottom of the preheater system and the entrance of the rotary kiln; the material cooling system is arranged at the kiln head end, the top of the material cooling system is connected to the outlet of the rotary kiln, and the bottom is provided with a discharge port, and a cooler with an external wind chamber is arranged in the material cooling system; the material cooling system includes a kiln head collecting cover, a sealing cover, a double-layer grate, a discharge gate, a cooler and a discharge device; the kiln head collecting cover surrounds the kiln head of the rotary kiln, A sealing cover is arranged at the outer end of the kiln head of the rotary kiln, and the kiln head of the rotary kiln and the sealing cover, as well as the sealing cover and the kiln head collecting cover are all sealed; the bottom of the kiln head collecting cover is connected to the cooler through a transition chamber, and a double-layer grate is arranged in the transition chamber; the mesh size of the upper layer of the double-layer grate is larger than the mesh size of the lower layer of the grate; the double-layer grate is arranged obliquely, and a discharge gate is arranged on one side of the transition chamber corresponding to the lower end of the double-layer grate; the cooler includes a plurality of independent cooling spaces, and a discharge port is arranged at the bottom of each cooling space; the discharging device includes a plurality of vibrating feeders and a central collecting hopper; the central collecting hopper is arranged below the cooler corresponding to the central position of the cooler, and a plurality of discharge ports are connected to the central collecting hopper through correspondingly arranged vibrating feeders, and a discharge port is arranged at the bottom of the central collecting hopper; a cooling air inlet is arranged at the bottom of the cooler to connect to the cooling air duct; The double-layer grate comprises an upper grate assembly and a lower grate assembly, wherein the upper grate assembly is composed of an upper grate, a high-end bracket, a low-end bracket and a middle bracket; the lower grate assembly is composed of a lower grate, a support beam and a support beam cooling air duct; the high end of the upper grate is connected to the corresponding side warehouse wall of the transition chamber through the high-end bracket, and the low end of the upper grate is connected to the corresponding side warehouse wall of the transition chamber through the low-end bracket; the lower grate is supported by the support beam, and the two ends of the support beam are respectively connected to the corresponding end warehouse walls of the transition chamber; the middle part of the upper grate is connected to the support beam through the middle bracket; one end of the support beam cooling air duct is connected to the cooling fan arranged outside the transition chamber, and the other end extends to the support beam and is provided with a plurality of air outlets; The unloading gate is composed of a closed gate body, a unloading gate, an electro-hydraulic push rod, a counterweight and a hanger; the closed gate body is arranged in parallel with the double-layer grate and is suspended on the outer side of the transition chamber by the hanger; the unloading gate is arranged in the closed gate body, and a counterweight is arranged on the unloading gate, and the unloading gate is in a closed state under the action of the counterweight; an electro-hydraulic push rod is also arranged between the unloading gate and the closed gate body, and a pressure sensor is arranged on the unloading gate, and the pressure sensor is interlocked with the electro-hydraulic push rod for control, and when the monitoring value of the pressure sensor is greater than the set unloading pressure value, the electro-hydraulic push rod overcomes the load of the counterweight to open the unloading gate; A support device 1 is arranged at one end of the kiln body near the kiln tail, and a support device 2 is arranged at one end of the kiln body near the kiln head; the support device 1 is provided with a heavy-duty blocking wheel and a heavy-duty supporting wheel group, which cooperate with the propulsion wheel belt; the support device 2 is provided with a heavy-duty supporting wheel group and cooperates with the wheel belt; a large gear ring is arranged between the support device 1 and the support device 2 and on the kiln body near the support device 1, and the large gear ring is connected with a dual-power transmission device and transmits power; the dual-power transmission device is composed of a driving motor and a diesel engine arranged in parallel; the propulsion wheel belt and the wheel belt are loosely sleeved on the corresponding positions of the outer ring of the kiln body through corresponding wheel belt pads; the wheel belt pads include floating pads and blocks; floating pads are respectively arranged at the gap between the propulsion wheel belt and the kiln body and at the gap between the wheel belt and the kiln body, and the four sides of the floating pad extend out of the propulsion wheel belt or the wheel belt and are provided with blocks, the floating pad is welded and fixed to the block, and the block is welded and fixed to the kiln body.

2. A large rotary kiln system according to claim 1, characterized in that: The heavy-duty stopper wheel is in rolling contact with the conical surface at the lower end of the propulsion wheel belt, and pushes the propulsion wheel belt through hydraulic drive, so that the propulsion wheel belt moves along the supporting wheel surface of the heavy-duty supporting wheel group, and drives the kiln body to move up and down reciprocatingly; the high end of the propulsion wheel belt on the side opposite to the heavy-duty stopper wheel is provided with an anti-upward movement device; the anti-upward movement device is a blocker, which is set at the highest limit position of the propulsion wheel belt upward movement stroke, and the heavy-duty stopper wheel is provided with a travel switch, and the signal output end of the travel switch is connected to the signal input end of the alarm device.

3. A large rotary kiln system according to claim 1, characterized in that: The supporting device 1 and the supporting device 2 are both provided with a jacking screw device, and the jacking screw device is arranged on the outer side of the supporting wheel seat of the corresponding heavy-load supporting wheel group.

4. A large rotary kiln system according to claim 1, characterized in that: The preheater system includes a distribution bin, a preheater body and a pushing system; the preheater body is composed of an upper ring bin and a lower cone bin; the distribution bin is arranged on the top of the upper ring bin; the upper ring bin is a hollow annular structure, and the interior of the upper ring bin is evenly divided into multiple distribution bins by partitions; the inner wall of the preheater body is provided with a thermal insulation layer; the pushing system is composed of multiple groups of pushing devices, and each group of pushing devices is arranged on the top of the lower cone bin in a one-to-one correspondence with each distribution bin.

5. A large rotary kiln system according to claim 1, characterized in that: The cooler is a cooler with an external air chamber, including an upper silo, a ring beam, a central air distributor, a chamber air distributor, a lower cone silo and a discharge cone bucket; the upper silo is a vertical silo, the top opening is a material inlet, and the bottom is supported on the ring beam; the central air distributor is arranged at the center of the upper silo, and a plurality of chamber air distributors are arranged on the periphery of the central air distributor, and the central air distributor is arranged higher than the chamber air distributor; the central air distributor is provided with a central wind cone and a central wind ring, and the chamber air distributor The distributor is provided with an air cone and an air ring; a plurality of unloading cone hoppers are connected to the bottom of the upper bin body, and the unloading cone hoppers are arranged one by one corresponding to the chamber air distributors, and a lower cone bin is arranged on the periphery of the unloading cone hoppers; the unloading cone hoppers are composed of multiple sections of cone hoppers, and an annular gap is arranged between two adjacent sections of cone hoppers; the space between the lower cone bin and the unloading cone hopper is divided into multiple air supply chambers, and the air supply chambers are connected with the chamber air distributors; the cooling air duct is connected to the central air distributor through the central air supply pipe, and is connected to the corresponding air supply chambers through multiple air chamber air supply pipes.

6. A large rotary kiln system according to claim 5, characterized in that: The central air distributor is arranged in the middle of the upper warehouse body and is composed of a central wind cone and a central wind ring. The central wind cone is located above the central wind ring. The central wind cone is composed of a vertical wind duct and a central wind hood fixedly arranged above the vertical wind duct. An annular air outlet is arranged between the central wind hood and the vertical wind duct. The bottom end of the vertical wind duct is connected to the central air supply duct. The central air ring is composed of an annular air duct and an annular wind hood fixedly arranged above the annular air duct. An inner annular air outlet and an outer annular air outlet are arranged between the annular wind hood and the annular air duct. The annular air duct is connected to the vertical air duct through an oblique connecting pipe. The chamber air distributor is arranged at the lower part of the upper warehouse body and is composed of a wind cone, an upper wind ring, a lower wind ring and a bottom cone. The upper wind ring is arranged above the wind cone, and the lower The wind ring is arranged below the wind cone; the wind cone is provided with an annular air outlet, and the upper wind ring and the lower wind ring are both provided with an inner annular air outlet and an outer annular air outlet; the upper wind ring and the lower wind ring are connected by a plurality of vertical connecting pipes, the wind cone is connected to the bottom cone cylinder by a straight pipe, and the straight pipe and the vertical connecting pipe are connected by a plurality of oblique connecting pipes; the bottom cone cylinder is connected to the air supply chamber through an internal transverse air duct; the unloading cone bucket is composed of a top cone bucket, a middle cone bucket and a bottom cone bucket, the bottom of the top cone bucket is inserted into the top of the middle cone bucket for a distance, and the bottom of the middle cone bucket is inserted into the top of the bottom cone bucket for a distance; the top cone bucket and the middle cone bucket, and the middle cone bucket and the bottom cone bucket are respectively connected by a plurality of connecting plates evenly arranged along the circumference.

7. The working method of a large rotary kiln system according to claim 1, characterized in that: The steps include: 1) The raw materials are evenly divided through the material distribution bins and introduced into the corresponding material distribution bins in the preheater body through multiple feeding pipes for preheating; 2) The preheated materials are pushed into the material chute by the pushing device in batches, and then transported to the entrance of the rotary kiln by the material chute; 3) The tilted rotary kiln is equipped with two-stage support, which transports the materials from the high-end inlet to the low-end outlet through rotation. The materials reaching the outlet are the materials that have completed calcination; 4) The calcined material is sent to the material cooling system, the material is naturally discharged from top to bottom and cooled by the cooler, the cooled material is discharged from the discharge pipe at the bottom of the material cooling system, and continuously sent out through the discharge system; 5) The cooling air is sent in from the lower part of the material cooling system, passes through the material layer in the cooler from bottom to top, enters the rotary kiln after cooling the material, and then flows from the lower end to the higher end of the rotary kiln, and then enters the preheater system to preheat the material, and finally is discharged through the preheater dust removal system.

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