A method for drying raw materials by using sintered brick kiln waste heat

Abstract

This invention discloses a method for drying raw materials using waste heat from a sintering brick kiln, relating to the field of sintering brick raw material drying technology. The invention first constructs a material pre-drying platform on the top surface of the tail section of the sintering brick kiln, places the material on the pre-drying platform, and opens a connecting opening at the top of the tail section near the brick outlet. The dryer is then mounted above the connecting opening, and an insulation structure is installed outside the drying equipment. This invention utilizes the waste heat of the kiln to pre-dry the raw materials, removing most of the moisture, before they enter the dryer for further drying. The waste heat from the kiln tail section is discharged through the connecting opening, acting on the dryer cylinder, and then conducted to the material inside the dryer. This isolates the kiln flue gas from contact with the material, preventing impact on the material's properties and sulfur content. The insulation structure also prevents flue gas escape and facilitates temperature control during drying.

Description

Technical Field

[0001] This invention relates to the field of sintered brick raw material drying technology, and more specifically to a method for drying raw materials using waste heat from sintered brick kilns. Background Technology

[0002] With the continuous development of society, the technology for utilizing waste heat in kilns for drying is becoming increasingly sophisticated. Existing kiln waste heat drying technologies typically include at least a conveying mechanism, a dryer, and a fan. In the process of utilizing waste heat in kilns for drying, the efficiency of waste heat utilization is particularly important.

[0003] For example, the utility model patent with publication number CN218372073U, publication date January 24, 2023, entitled "A Tunnel Kiln Top-Mounted Sludge Drying System," describes a system where a ventilation opening is created at the top of the cooling section of the tunnel kiln, and a sludge dryer is positioned above the ventilation opening, with the ventilation opening connected to the bottom of the drying chamber of the sludge dryer. This utility model utilizes the waste heat of the tunnel kiln to dry the sludge, directly connecting the ventilation opening to the drying chamber of the sludge dryer, allowing the waste heat of the tunnel kiln to directly enter the dryer's interior and dry the sludge transported within.

[0004] While this treatment method reduces the need for piping and avoids heat loss during pipeline transport, the waste heat from the tunnel kiln cooling section directly affects the dryer's interior. Firstly, the drying temperature cannot be controlled, and the high-temperature waste heat from the tunnel kiln cooling section causes high-temperature damage to the dryer's interior, affecting its lifespan. Secondly, the high-temperature waste heat from the tunnel kiln cooling section is essentially the tunnel kiln's flue gas. Directly applying this flue gas to the sludge raw material causes sulfides and other contaminants in the flue gas to mix into the raw material, significantly increasing its sulfur content and affecting its performance. When the dried raw material is discharged, it carries some flue gas with it, causing some flue gas to escape into the environment. Simultaneously, the waste heat entering the dryer creates air pressure, causing the raw material inside to be blown out from the other end of the dryer, resulting in significant material loss and large gas emissions, failing to meet environmental protection requirements. Summary of the Invention

[0005] To overcome the defects and shortcomings of the existing technology, this invention provides a method for drying raw materials using the waste heat of a sintering brick kiln. The purpose of this invention is to solve the problems of ineffective temperature control, the impact of kiln flue gas on raw material performance, and the escape of kiln flue gas in existing kiln waste heat drying technologies. The method of this invention involves first constructing a material pre-drying platform on the top surface of the tail section of the sintering brick kiln. The material is placed on the pre-drying platform, and the waste heat emitted by the kiln tail section is transferred to the material through the pre-drying platform. This allows some moisture to evaporate from the material before it enters the dryer, improving the drying efficiency of the downstream drying equipment. A connecting opening is made at the top of the kiln tail section near the brick exit direction. A dryer with a roller type, chain plate type, or metal mesh belt type structure is installed above the connecting opening. An insulation structure is installed outside the dryer, covering both the dryer and the connecting opening. This ensures that the waste heat from the connecting opening is contained within the insulation chamber formed by the insulation structure, preventing the escape of kiln flue gas and environmental pollution. This invention utilizes waste heat from the kiln to pre-dry the raw materials, removing most of the moisture, before they enter the dryer for final drying. Waste heat from the kiln's tail section is diverted through a connecting port, acting on the dryer cylinder and then conducted to the material inside. This isolates the material from contact with kiln flue gas, preventing impact on material properties and sulfur content, while also avoiding material loss and dust pollution caused by wind pressure. The insulation structure prevents flue gas escape and facilitates control of the drying temperature.

[0006] To address the problems existing in the prior art, the present invention is achieved through the following technical solution.

[0007] This invention provides a method for drying raw materials using waste heat from a sintering brick kiln, the method specifically comprising:

[0008] A material pre-drying platform is built at the top of the tail section of the kiln, and the material to be dried is laid on the material pre-drying platform; the residual heat emitted from the tail section of the kiln is conducted to the material through the material pre-drying platform, so that some of the moisture in the material evaporates before entering the dryer at the rear.

[0009] A connecting opening is made in the top of the kiln near the brick outlet in the tail section of the kiln, penetrating the inner cavity of the kiln. The drying equipment is placed above the connecting opening, so that the connecting opening is located within the projection plane of the drying equipment at the top of the tail section of the kiln. An insulation cover is installed on the drying equipment, and the bottom of the insulation cover is sealed to the top of the tail section of the kiln, so that the connecting opening is located inside the sealed cavity of the insulation cover. The feed inlet and discharge outlet of the drying equipment are located outside the insulation cover. The residual heat of the tail section of the kiln is conducted through the connecting opening to the sealed cavity of the insulation cover, heating the drying body of the drying equipment inside the sealed cavity of the insulation cover.

[0010] A feeding hopper and a feeding belt are set up on the material pre-drying platform. The pre-dried material on the material pre-drying platform is input into the feeding hopper and then conveyed into the drying body of the drying equipment by the feeding belt for drying treatment. After the drying treatment is completed, the dried material is discharged through the discharge port of the drying equipment and conveyed to the storage area by the discharge belt.

[0011] More preferably, the construction of the material pre-drying platform specifically refers to building a foundation in the insulation wall of the kiln using embedded parts, refractory concrete and refractory aggregate, and performing insulation treatment on both sides of the inner wall.

[0012] After the foundation is completed, I-beams are connected and fixed to the embedded parts of the foundation to obtain the embedded main beam. Then, I-beams are used to connect the corresponding insulation wall main beams between the kilns, so that the I-beams are suspended above the kilns to form the suspended main beam.

[0013] After the embedded main beam and the suspended main beam are connected, channel steel is used to connect the suspended beam and the embedded main beam, and a square frame is welded. After the welding is completed, thick steel plates are laid on the frame, thus completing the construction of the material pre-drying platform.

[0014] In a further preferred embodiment, a material pre-drying platform is built above several heat dissipation holes opened on the top of the kiln in the tail section of the kiln, with a gap left between the bottom of the material preheating and drying platform and the heat dissipation holes.

[0015] More preferably, the drying equipment has multiple spaced communication ports and heat insulation covers along its axial direction. The heat insulation covers are positioned above the communication ports and wrap around the drying body of the drying equipment in the circumferential direction.

[0016] More preferably, the connection port is set up by opening one or more connection ports on the top of the kiln near the brick outlet in the tail section of the kiln. The width of the opening is 0.5m-1m. The opening is fixed and insulated around the opening with channel steel and insulation cotton to form the connection port.

[0017] In a further preferred embodiment, the drying body of the drying equipment is supported by a shaft box base and a cast steel ring. The cast steel ring is fixedly sleeved on the drying body and cooperates with and rotates with the shaft box base. A cast steel gear ring is fixedly sleeved on the drying body. The gear ring meshes with a speed reduction drive device, which drives the drying body to rotate.

[0018] More preferably, the drying body is formed by rolling a steel plate with a thickness of 5mm-20mm into a central roller with a diameter of 1m-3m. A feeder and a discharger are respectively installed at both ends of the drying body to form the feed port and discharge port. A dehumidifying fan is installed at the discharge port of the drying body to remove moisture from the material inside the drying body.

[0019] More preferably, the insulation cover is equipped with an induced draft fan, and the outlet of the induced draft fan is connected to the kiln flue; the temperature inside the insulation cover is controlled by controlling the air volume of the induced draft fan.

[0020] In a further preferred embodiment, a gate is installed at the connection port to close or open the connection port, and the temperature inside the insulation cover is controlled by controlling the opening and closing of the connection port and the air volume of the induced draft fan.

[0021] A further preferred embodiment is to install a dust return pipe at the feed inlet of the drying equipment, which is equipped with a cyclone dust collector and a fan, and finally connects to the dust settling tank.

[0022] A further preferred option is to connect a bag filter dust collector to the storage area.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0024] 1. The method of this invention is to first build a material pre-drying platform on the top surface of the tail section of the sintering brick kiln, and then lay the material on the pre-drying platform. The residual heat emitted by the tail section of the kiln itself is transferred to the material through the material pre-drying platform, so that the material evaporates some of the moisture using the residual heat of the tail section of the kiln before entering the dryer, thereby improving the drying efficiency of the downstream drying equipment. A connecting opening is opened at the top of the tail section of the kiln near the brick discharge direction, and a drum dryer is set above the connecting opening. An insulation structure is set outside the dryer, covering the dryer and the connecting opening. The residual heat discharged from the connecting opening is contained in the insulation chamber formed by the insulation structure, preventing the flue gas in the kiln from escaping and causing environmental pollution. This invention utilizes the waste heat of the kiln to pre-dry the raw materials, removing most of the moisture, before they enter the dryer for further drying. The waste heat from the tail section of the kiln is discharged through a connecting port, acting on the dryer cylinder, and then conducted to the material inside the dryer. This isolates the kiln flue gas from contact with the material, preventing it from affecting the material's properties and sulfur content. The insulation structure also prevents the escape of flue gas, which is beneficial for controlling the drying temperature.

[0025] 2. Compared with the existing CN218372073U, the drying method of this invention does not directly dry the material with the waste heat from brick firing. Instead, the heat is transferred upwards through the connecting port and then transferred through the drum before drying. This avoids direct contact between the flue gas and the material, preventing sulfides in the flue gas from being mixed into the material and affecting its properties. The installation of an insulation hood not only prevents the flue gas inside the kiln from escaping to the outside, but also facilitates the control and monitoring of the waste heat temperature, thus improving the temperature control of the drying equipment.

[0026] 3. In the drying method of the present invention, with the setting of the heat insulation cover, all the heat discharged from the tail section of the kiln is concentrated in the heat insulation cover, and the heat loss is small. With the setting of the heat insulation cover, it is equivalent to opening an independent chamber on the tail section of the kiln, and the drying equipment is directly placed in the chamber for heating, which reduces the thermal shock to the tail section of the kiln and avoids the temperature of the tail section of the kiln dropping too much, which would affect the annealing and cooling of the fired bricks.

[0027] 4. In this invention, the material is first pre-dried on a material pre-drying platform. The pre-drying platform utilizes some of the heat dissipated from the kiln to dry the material. The area of ​​the material pre-drying platform is much larger than that of the drying equipment. Laying the material on the pre-drying platform increases the contact area between the material and the residual heat dissipated from the kiln, pre-evaporating most of the moisture in the material. Simultaneously, it raises the temperature of the material, ensuring it maintains a certain temperature and humidity before entering the drying equipment. Compared to directly feeding the material into the drying equipment, this method significantly improves drying efficiency. When processing the same amount of material, the drying method of this invention can greatly shorten the drying time and improve material processing efficiency.

[0028] 5. In this invention, the material pre-drying platform is suspended above the kiln, with a certain gap between the material pre-drying platform and the kiln. This arrangement does not affect the heat dissipation of the kiln, and will not have a significant impact on the control of the kiln temperature. On the other hand, the weight of the material pre-drying platform will not be borne by the kiln, reducing the load on the kiln and preventing the material's own weight from damaging the kiln.

[0029] 6. In this invention, the material pre-drying platform is constructed of steel structure and steel plates. The waste heat emitted from the kiln first heats the steel plates, and then is conducted to the material through the steel plates. On the one hand, the steel structure material pre-drying platform has high structural strength and stability, facilitates mechanized operation, and can support small loading forklifts to operate on it, thereby improving work efficiency. On the other hand, the steel structure has good thermal conductivity, which can conduct the waste heat emitted from the kiln to the material for pre-drying.

[0030] 7. This invention involves opening several heat dissipation holes on the top of the kiln in the tail section. These holes are designed to control the temperature inside the kiln. When the temperature inside the kiln is high, heat can be dissipated through these holes. A material pre-drying platform is positioned above these holes, allowing the heat dissipated through the holes to pre-dry the material. A gap is provided between the material pre-drying platform and the heat dissipation holes, effectively utilizing residual heat for material pre-drying without affecting heat dissipation within the kiln.

[0031] 8. In this invention, the length of the connecting port can be set according to the actual size of the kiln, and the width of the connecting port is set in the range of 0.5m-1m. On the one hand, it is compatible with the drying equipment, and on the other hand, it is also set by taking into account the temperature of the tail section of the kiln and the cavity inside the heat preservation cover. The width of the connecting port is reasonably designed, which not only avoids too much heat from escaping from the tail section of the kiln and affecting the temperature of the tail section, but also sets the kiln as the heating furnace of the heating drying equipment. The connecting port is the furnace opening, and the heat output from the connecting port can be directly applied to the drying equipment to heat the drying equipment.

[0032] 9. This invention features a gate valve at the connecting port. By opening and closing the gate valve and controlling the induced draft fan on the insulation cover, the temperature inside the insulation cover can be controlled, thereby controlling the temperature of the drying equipment and preventing excessive temperature from damaging the drying equipment. At the same time, the gate design can also effectively control the amount of residual heat dissipation from the tail section of the kiln. By controlling the opening degree of the gate, the residual heat dissipated from the tail section of the kiln can be precisely controlled, preventing the temperature inside the tail section of the kiln from dropping too quickly. Especially when the drying equipment is started or the kiln is started, closing the gate ensures a stable temperature rise inside the kiln and prevents a large amount of residual heat from dissipating.

[0033] 10. The drying equipment of this invention drives the drying body to rotate via a reduction drive mechanism. This rotation causes the material inside the drying body to tumble and be heated evenly, accelerating the drying process. The dust return pipe at the feed inlet, the cyclone dust collector, and the bag filter in the storage area effectively control dust generation during the drying process, preventing environmental pollution. The exhaust fan in the drying equipment facilitates the removal of evaporated moisture from the drying body, thus promoting efficient material drying. Attached Figure Description

[0034] Figure 1 This is a layout diagram of an equipment for drying raw materials using the waste heat of a brick sintering kiln, according to the present invention.

[0035] Figure 2 This is a top view schematic diagram of the kiln used in the present invention to dry raw materials using the waste heat of a sintering brick kiln;

[0036] Figure 3 This is a layout diagram of the drying equipment used in this invention to dry raw materials using the waste heat of a sintering brick kiln.

[0037] Figure 4 This is a flow chart of the equipment used in this invention to dry raw materials using waste heat from a brick sintering kiln.

[0038] Attached reference numerals: 1. Kiln tail section; 2. Material pre-drying platform; 3. Brick outlet; 4. Connecting port; 5. Drying equipment; 6. Insulation cover; 7. Feeding hopper; 8. Feeding belt; 9. Drying body; 10. Discharge belt; 11. Storage area; 12. Heat dissipation hole; 13. Feed inlet dust return pipe; 14. Cyclone dust collector; 15. Fan; 16. Dust settling tank; 17. Bag filter dust collector; 18. Kiln flue; 19. Cast steel gear ring; 20. Reduction drive equipment. Detailed Implementation

[0039] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0040] Existing technologies for drying materials using waste heat from kilns mostly involve installing pipes in the kiln's tail section (cooling section) to transfer the waste heat into the drying equipment. Alternatively, the waste heat from the kiln's tail section (cooling section) can be directly transferred into the drying equipment. This results in direct contact between the kiln flue gas and the material, affecting the material's chemical properties. For example, sulfides in the flue gas can become mixed into the material, increasing its sulfur content.

[0041] Existing kiln waste heat drying technologies all rely on drying equipment to dry materials. However, the processing capacity of this equipment is limited. Increasing the capacity requires either increasing the size or number of drying units, significantly increasing the cost of the drying process. Currently, there is no technology that utilizes kiln waste heat for pre-drying materials, evaporating most of the moisture before they enter the drying equipment, thereby improving drying capacity and efficiency.

[0042] Based on the aforementioned deficiencies, this embodiment provides a method for drying raw materials using the waste heat of a sintering brick kiln. First, a material pre-drying platform 2 is constructed on the top surface of the tail section of the sintering brick kiln. The material is then laid on the pre-drying platform, and the waste heat emitted by the tail section 1 of the kiln is transferred to the material through the material pre-drying platform 2. This allows some of the moisture in the material to evaporate using the waste heat of the tail section 1 before it enters the dryer, thereby improving the drying efficiency of the downstream drying equipment. A connecting opening 4 is opened at the top of the tail section 1 of the kiln near the brick outlet direction. A drum dryer is then mounted above the connecting opening 4, and an insulation structure is installed outside the dryer. The insulation structure covers the dryer and the connecting opening 4, so that the waste heat discharged from the connecting opening 4 is contained within the insulation chamber formed by the insulation structure, preventing the flue gas inside the kiln from escaping and causing environmental pollution. This invention utilizes the waste heat of the kiln to pre-dry the raw materials, removing most of the moisture, before they enter the dryer for further drying. The waste heat from the tail section 1 of the kiln is discharged through the connecting port 4, acting on the dryer cylinder, and then conducted to the material inside the dryer. This isolates the kiln flue gas from contact with the material, preventing it from affecting the material's properties and sulfur content. The insulation structure also prevents the escape of flue gas, which is beneficial for controlling the drying temperature.

[0043] The technical solution of the present invention will be clearly and completely described through the following specific embodiments.

[0044] Example 1

[0045] As a preferred embodiment of the present invention, please refer to the appendix to the specification. Figure 1 As shown, this embodiment provides a method for drying raw materials using the waste heat of a sintering brick kiln. The method specifically involves: constructing a material pre-drying platform 2 at the top of the kiln tail section 1, and placing the material to be dried on the material pre-drying platform 2; the waste heat emitted from the kiln tail section 1 is conducted to the material through the material pre-drying platform 2, causing some of the moisture in the material to evaporate before entering the dryer at the rear end; the gas generated during evaporation can be subjected to high-temperature combustion treatment.

[0046] A connecting port 4 is opened at the top of the kiln near the brick outlet 3 in the tail section 1 of the kiln, penetrating the inner cavity of the kiln. The drying equipment 5 is installed above the connecting port 4, so that the connecting port 4 is located within the projection plane of the drying equipment 5 at the top of the tail section 1 of the kiln. A heat insulation cover 6 is installed on the drying equipment 5, and the bottom of the heat insulation cover 6 is sealed to the top of the tail section 1 of the kiln, so that the connecting port 4 is located in the sealed cavity of the heat insulation cover 6. The feed inlet and discharge outlet of the drying equipment 5 are located outside the heat insulation cover 6. The residual heat of the tail section 1 of the kiln is conducted to the sealed cavity of the heat insulation cover 6 through the connecting port 4, heating the drying body 9 of the drying equipment 5 inside the sealed cavity of the heat insulation cover 6.

[0047] A feeding hopper 7 and a feeding belt 8 are set on the material pre-drying platform 2. The pre-dried material on the material pre-drying platform 2 is input into the feeding hopper 7 and conveyed into the drying body 9 of the drying equipment 5 by the feeding belt 8 for drying treatment. After the drying treatment is completed, the dried material is discharged through the discharge port of the drying equipment 5 and conveyed to the storage area 11 by the discharge belt 10.

[0048] In this embodiment, the waste heat of the kiln is used to pre-dry the raw materials, removing most of the moisture, before they enter the dryer for further drying. The waste heat of the tail section 1 of the kiln is discharged through the connecting port 4 and applied to the dryer cylinder, and then conducted to the material inside the dryer. This isolates the kiln flue gas from contact with the material, avoiding any impact on the material's properties and sulfur content. The insulation structure also prevents the escape of flue gas, which is beneficial for controlling the drying temperature.

[0049] The pre-drying platform utilizes some of the heat dissipated from the kiln to dry the material on the pre-drying platform 2. The area of ​​the pre-drying platform 2 is much larger than that of the drying equipment 5. Laying the material on the pre-drying platform 2 increases the contact area between the material and the residual heat dissipated from the kiln, pre-evaporating most of the moisture in the material. Simultaneously, it raises the temperature of the material, ensuring it maintains a certain temperature and humidity before entering the drying equipment 5. Compared to directly feeding the material into the drying equipment 5, this method significantly improves drying efficiency. When processing the same amount of material, the drying method of this invention can greatly shorten the drying time and improve material processing efficiency.

[0050] In this embodiment, the drying equipment can be a drum dryer, a chain plate dryer, or a metal mesh belt dryer. The appropriate drying equipment can be selected based on the requirements of the sintering brick kiln site, drying capacity, etc. Chain plate or metal mesh belt dryers utilize motors and shaft rotation to rotate and heat the material in multiple or single layers. If a frame-type single-layer or multi-layer metal mesh chain dryer is used, the waste heat of the kiln is used to heat and dry the raw materials.

[0051] Example 2

[0052] As another preferred embodiment of the present invention, this embodiment is a further detailed supplement and explanation of the technical solution of the present invention based on the above embodiment 1.

[0053] In one embodiment of this invention, the kiln roof can be directly used as the material pre-drying platform 2. However, this method of directly using the kiln roof as the material pre-drying platform 2 poses a significant challenge to the load-bearing capacity of the kiln, increases the load on the kiln, and may cause damage to the kiln.

[0054] Therefore, as a preferred implementation method of this embodiment, the construction of the material pre-drying platform 2 specifically refers to: constructing a foundation within the insulation wall of the kiln using embedded parts, refractory concrete, and refractory aggregate, and insulating both sides of the inner wall; after the foundation is completed, connecting and fixing I-beams to the embedded parts of the foundation to obtain the embedded main beam; then connecting the corresponding insulation wall main beams between the kilns using I-beams, so that the I-beams are suspended above the kilns, forming a suspended main beam; after the embedded main beam and the suspended main beam are connected, connecting the suspended beam and the embedded main beam with channel steel, and welding a square frame; after welding is completed, laying thick steel plates on the frame, thus completing the construction of the material pre-drying platform 2.

[0055] The construction method of the material pre-drying platform 2 provided in this embodiment differs from the existing method of directly using the kiln roof as the pre-drying platform. In this method, the material pre-drying platform 2 is suspended above the kiln, with a certain gap between it and the kiln. This arrangement ensures that the heat dissipation of the kiln is not affected, and the control of the kiln temperature will not be significantly impacted. Furthermore, the weight of the material pre-drying platform 2 is not borne by the kiln, reducing the load on the kiln and preventing damage to the kiln due to the weight of the material itself.

[0056] In this embodiment, the material pre-drying platform 2 is constructed of steel structure and steel plates. The waste heat emitted from the kiln first heats the steel plates, and then is conducted to the material through the steel plates. On the one hand, the steel structure of the material pre-drying platform 2 has high structural strength and stability, which facilitates mechanized operation and can support small forklifts to operate on it, thereby improving work efficiency. On the other hand, the steel structure has good thermal conductivity, which can conduct the waste heat emitted from the kiln to the material for pre-drying.

[0057] As one implementation method of this embodiment, please refer to the appendix to the specification. Figure 3 As shown, multiple spaced-apart connecting ports and heat insulation covers are arranged along the axial direction of the drying equipment. The heat insulation covers are positioned above the connecting ports and circumferentially enclose the drying body of the drying equipment. The spaced-apart connecting ports and heat insulation covers ensure that the residual heat in the connecting ports is contained within the inner cavity of the heat insulation covers, thus heating the drying body. The drying equipment is divided into multiple sections by the spaced-apart heat insulation covers. Some sections are heated by the residual heat from the connecting ports, while others are not heated and do not have heat insulation covers. This allows the material to experience a temperature pattern of heating up and cooling down as it moves from the inlet to the outlet within the drying equipment. This avoids excessively high temperatures from affecting the material's properties, and the temperature fluctuations facilitate the evaporation of moisture from the material, thereby improving the drying effect while reducing equipment costs.

[0058] Example 3

[0059] As another preferred embodiment of the present invention, this embodiment is a further detailed description and supplement to the technical solution of the present invention based on the above-described Embodiment 1 or Embodiment 2. (Refer to the appendix of the specification.) Figure 2 As shown, the material pre-drying platform 2 is built above the heat dissipation holes 12 opened on the top of the kiln in the tail section 1 of the kiln, and a gap is left between the bottom of the material preheating and drying platform and the heat dissipation holes 12.

[0060] In this embodiment, several heat dissipation holes 12 are opened on the top of the kiln in the tail section 1 of the kiln. The heat dissipation holes 12 are set to control the temperature inside the kiln. When the temperature inside the kiln is high, heat can be dissipated through the heat dissipation holes 12. The material pre-drying platform 2 is set above the heat dissipation holes 12, and the heat dissipation holes 12 can be used to pre-dry the material. A gap is set between the material pre-drying platform 2 and the heat dissipation holes 12 to effectively utilize the residual heat for material pre-drying without affecting the heat dissipation inside the kiln.

[0061] Example 4

[0062] As another preferred embodiment of the present invention, this embodiment further elaborates and supplements the technical solution of the present invention based on the above-described embodiments 1, 2, or 3. In this embodiment, the connection port 4 is specifically set as follows: one or more connection ports 4 are opened on the top of the kiln near the brick outlet 3 in the tail section 1 of the kiln, with the width of the opening being 0.5m-1m; the opening is fixed and insulated around the perimeter with channel steel and insulation cotton to form the connection port 4.

[0063] In this embodiment, the length of the connecting port 4 can be set according to the actual size of the kiln, and the width of the connecting port 4 is set in the range of 0.5m-1m. On the one hand, it is compatible with the drying equipment 5, and on the other hand, it is also set by taking into account the temperature of the tail section 1 of the kiln and the cavity inside the heat preservation cover 6. The width of the connecting port 4 is reasonably designed, which not only avoids too much heat from escaping from the tail section 1 of the kiln and affecting the temperature of the tail section 1, but also sets the kiln as the heating furnace for heating the drying equipment 5. The connecting port 4 is the furnace opening, and the heat output from the connecting port 4 can be directly applied to the drying equipment 5 to heat the drying equipment 5.

[0064] For further optimized solutions, please refer to the appendix to the instruction manual. Figure 4 As shown, the drying body 9 of the drying equipment 5 is supported by a shaft box base and a cast steel ring. The cast steel ring is fixedly sleeved on the drying body and cooperates with the shaft box base and rotates. A cast steel gear ring 19 is fixedly sleeved on the drying body 9. The gear ring 19 meshes with the speed reduction drive device 20, and the speed reduction drive device 20 drives the drying body to rotate.

[0065] The segmented heat preservation cover structure in Embodiment 2 above can expose part of the drying body, which is convenient for assembling the shaft box base and the cast steel part aperture. At the same time, the cast steel part gear ring 19 can be installed in the middle of the drying body 9, so that the drying body 9 can be driven by a single reduction drive device 20, instead of setting two sets of reduction drive devices 20 and cast steel part gear ring 19 at both ends, thus reducing equipment costs.

[0066] The drying body 9 is formed by rolling a steel plate with a thickness of 5mm-20mm into a circular drum with a diameter of 1m-3m. A feeder and a discharger are respectively installed at both ends of the drying body 9 to form the feed port and discharge port. A dehumidifying fan 15 is installed at the discharge port of the drying body 9 to remove moisture from the material inside the drying body 9.

[0067] More preferably, the heat insulation cover 6 is equipped with an induced draft fan, and the outlet of the induced draft fan is connected to the kiln flue 18; the temperature inside the heat insulation cover 6 is controlled by controlling the air volume of the induced draft fan.

[0068] In a further preferred embodiment, a gate is provided at the connection port 4 to close or open the connection port 4. By controlling the opening and closing of the connection port 4 and the air volume of the induced draft fan, the temperature inside the insulation cover 6 is controlled.

[0069] In a further preferred embodiment, a dust return pipe 13 is provided at the feed inlet of the drying equipment 5. A cyclone dust collector 14 and a fan 15 are provided on the dust return pipe 13, and finally connected to the dust settling tank 16.

[0070] In a further preferred embodiment, a bag filter 17 is connected to the storage area 11.

[0071] In this embodiment, the drying equipment 5 drives the drying body 9 to rotate via a reduction drive mechanism. The rotation of the drying body 9 causes the material inside to tumble and be heated evenly, accelerating the drying process. The dust return pipe 13 at the feed inlet of the drying equipment 5, the cyclone dust collector 14, and the bag filter 17 in the storage area 11 effectively control dust generation during the drying process, preventing environmental pollution. The exhaust fan 15 of the drying equipment 5 facilitates the removal of evaporated moisture from the drying body 9, thus aiding in the drying of the material.

[0072] In this embodiment, a gate valve is installed at the connection port 4. By opening and closing the gate valve and controlling the induced draft fan on the insulation cover 6, the temperature inside the insulation cover 6 can be controlled, thereby controlling the temperature of the drying equipment 5 and preventing excessive temperature from damaging the drying equipment 5. At the same time, the gate design can also effectively control the amount of residual heat dissipation from the tail section 1 of the kiln. By controlling the opening degree of the gate, the residual heat dissipated from the tail section 1 of the kiln can be precisely controlled, preventing the temperature inside the tail section 1 of the kiln from dropping too quickly. Especially when the drying equipment is started or the kiln is started, closing the gate ensures that the temperature rise inside the kiln is stable and that a large amount of residual heat is not dissipated.

[0073] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A method for drying raw materials using waste heat from a brick sintering kiln, characterized in that: The method is as follows: A material pre-drying platform (2) is built on top of the tail section (1) of the kiln. The material to be dried is laid on the material pre-drying platform (2). The residual heat emitted by the tail section (1) of the kiln is conducted to the material through the material pre-drying platform (2), so that some of the moisture in the material evaporates before it enters the dryer at the rear end. The construction of the material pre-drying platform (2) specifically refers to the construction of a foundation in the insulation wall of the kiln using embedded parts, refractory concrete and refractory aggregate, and insulation treatment on both sides of the inner wall. After the foundation is completed, I-beams are connected and fixed to the embedded parts of the foundation to obtain the embedded main beam. Then, I-beams are used to connect the corresponding insulation wall main beams between the kilns, so that the I-beams are suspended above the kilns to form the suspended main beam. After the embedded main beam and the suspended main beam are connected, the suspended main beam and the embedded main beam are connected with channel steel and the square frame is welded. After the welding is completed, thick steel plates are laid on the frame to complete the construction of the material pre-drying platform (2). A connecting port (4) is opened at the top of the kiln near the brick outlet (3) in the tail section (1) of the kiln, penetrating the inner cavity of the kiln. The drying equipment (5) is set above the connecting port (4), so that the connecting port (4) is located within the projection plane of the drying equipment (5) at the top of the tail section (1) of the kiln. A heat insulation cover (6) is set on the drying equipment (5), and the bottom of the heat insulation cover (6) is sealed to the top of the tail section (1) of the kiln, so that the connecting port (4) is located in the sealed cavity of the heat insulation cover (6). The feed inlet and discharge outlet of the drying equipment (5) are located outside the heat insulation cover (6). The residual heat of the tail section (1) of the kiln is conducted to the sealed cavity of the heat insulation cover (6) through the connecting port (4), and heats the drying body (9) of the drying equipment (5) in the sealed cavity of the heat insulation cover (6). A feeding hopper (7) and a feeding belt (8) are set on the material pre-drying platform (2). The pre-dried material on the material pre-drying platform (2) is fed into the feeding hopper (7) and conveyed into the drying body (9) of the drying equipment (5) by the feeding belt (8) for drying treatment. After the drying treatment is completed, the dried material is discharged through the outlet of the drying equipment (5) and conveyed to the storage area (11) by the discharge belt (10).

2. The method for drying raw materials using waste heat from a sintering brick kiln as described in claim 1, characterized in that: Using the heat dissipation holes (12) opened on the top of the kiln in the tail section (1) of the kiln, the material pre-drying platform (2) is built above the heat dissipation holes (12), and a gap is left between the bottom of the material preheating and drying platform and the heat dissipation holes (12).

3. A method for drying raw materials using waste heat from a sintering brick kiln as described in claim 1 or 2, characterized in that: Multiple spaced communication ports (4) and heat insulation covers (6) are provided along the axial direction of the drying equipment (5). The heat insulation covers (6) are correspondingly arranged above the communication ports (4) and wrap around the drying body (9) of the drying equipment (5) in the circumferential direction.

4. A method for drying raw materials using waste heat from a sintering brick kiln as described in claim 1 or 2, characterized in that: The connection port (4) is set in such a way that one or more connection ports (4) are opened on the top of the kiln near the brick outlet (3) in the tail section (1) of the kiln. The width of the opening is 0.5m-1m. The opening is fixed and insulated with channel steel and insulation cotton around it to form the connection port (4).

5. A method for drying raw materials using waste heat from a sintering brick kiln as described in claim 1 or 2, characterized in that: The drying body (9) of the drying equipment (5) is supported by a shaft box base and a cast steel ring. The cast steel ring is fixedly sleeved on the drying body (9), and the cast steel ring cooperates with the shaft box base and rotates. A cast steel gear ring is fixedly sleeved on the drying body (9), and the gear ring meshes with a speed reduction drive device, which drives the drying body (9) to rotate.

6. The method for drying raw materials using waste heat from a sintering brick kiln as described in claim 5, characterized in that: The drying body (9) is formed by rolling a steel plate with a thickness of 5mm-20mm into a circular roller with a diameter of 1m-3m. A feeder and a discharger are respectively installed at both ends of the drying body (9) to form the feed port and discharge port. A dehumidifying fan is set at the discharge port of the drying body (9) for dehumidifying the material inside the drying body (9).

7. A method for drying raw materials using waste heat from a sintering brick kiln as described in claim 1 or 2, characterized in that: The heat insulation cover (6) is equipped with an induced draft fan, and the outlet of the induced draft fan is connected to the kiln flue (18); the temperature inside the heat insulation cover (6) is controlled by controlling the air volume of the induced draft fan.

8. A method for drying raw materials using waste heat from a sintering brick kiln as described in claim 7, characterized in that: A gate is set at the connection port (4) to close or open the connection port (4). The temperature inside the heat insulation cover (6) is controlled by controlling the gate to open or close the connection port (4) and the air volume of the induced draft fan.

9. A method for drying raw materials using waste heat from a sintering brick kiln as described in claim 5, characterized in that: A dust return pipe (13) is installed at the feed inlet of the drying equipment (5). A cyclone dust collector (14) and a fan (15) are installed on the dust return pipe (13), and finally connected to the dust settling tank (16).

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