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CN-117073357-B - Method for drying raw materials by using waste heat of brick sintering kiln

CN117073357BCN 117073357 BCN117073357 BCN 117073357BCN-117073357-B

Abstract

The invention discloses a method for drying raw materials by using waste heat of a brick sintering kiln, and relates to the technical field of brick sintering raw material drying. According to the invention, a material pre-drying platform is firstly built on the top surface of a tail fire section of a baked brick kiln, materials are laid on the pre-drying platform, a communication port is formed in the top of the kiln tail fire section, which is close to the brick outlet direction, a dryer is erected above the communication port, and a heat preservation structure is arranged outside drying equipment. The invention uses the waste heat of the kiln to pre-dry the raw materials, most of the moisture in the dried raw materials is then dried in the dryer, the waste heat of the fire section of the kiln tail is led out through the communication port and acts on the cylinder body of the dryer, and then is transmitted to the materials in the dryer through the cylinder body of the dryer, thereby isolating the contact between the kiln flue gas and the materials, avoiding affecting the performance and sulfur content of the materials, and avoiding the dissipation of the flue gas due to the arrangement of the heat preservation structure, and being beneficial to the control of the drying temperature.

Inventors

  • DU CHENGJIE
  • LIU WENJUN

Assignees

  • 乐山市五通桥区有明机砖厂

Dates

Publication Date
20260505
Application Date
20230922

Claims (9)

  1. 1. A method for drying raw materials by using waste heat of a brick sintering kiln is characterized by comprising the following steps: Setting up a material pre-drying platform (2) at the top of the kiln tail fire section (1), and laying the material to be dried on the material pre-drying platform (2), wherein the residual heat emitted by the kiln tail fire section (1) is conducted onto the material through the material pre-drying platform (2) so that part of water is evaporated before the material enters a dryer at the rear end; The construction of the material pre-drying platform (2) specifically refers to taking an embedded part, refractory concrete and refractory aggregate as a foundation in a heat-insulating wall of a kiln, and carrying out heat-insulating treatment on two sides of an inner wall; After the foundation is well manufactured, connecting and fixing the I-steel with an embedded part of the foundation to obtain an embedded part main beam, and then connecting the I-steel with a corresponding heat-insulating wall main beam between the kilns to enable the I-steel to be suspended above the kilns to form a suspended main beam; After the embedded part main beam and the suspended main beam are connected, the suspended main beam and the embedded part main beam are connected through channel steel, square frame welding is carried out, and after welding is finished, a thick steel plate is paved on the frame, so that the construction of the material pre-drying platform (2) is finished; A communication port (4) penetrating through the inner cavity of the kiln is formed in the kiln top of the kiln tail fire section (1) close to the brick outlet (3), drying equipment (5) is erected above the communication port (4) so that the communication port (4) is positioned in a projection plane of the drying equipment (5) at the top of the kiln tail fire section (1), a heat preservation cover (6) is arranged on the drying equipment (5), the bottom of the heat preservation cover (6) is sealed with the top of the kiln tail fire section (1) so that the communication port (4) is positioned in a closed cavity of the heat preservation cover (6), and the feed port and the discharge port of the drying equipment (5) are positioned outside the heat preservation cover (6), and waste heat of the kiln tail fire section (1) is conducted into the closed cavity of the heat preservation cover (6) through the communication port (4) to heat a drying body (9) of the drying equipment (5) in the closed cavity of the heat preservation cover (6); The material pre-drying platform (2) is provided with a feeding bin (7) and a feeding belt (8), the material pre-dried on the material pre-drying platform (2) is input into the feeding bin (7), the material is conveyed into a drying body (9) of a drying device (5) through the feeding belt (8) to be dried, and after the drying treatment is finished, the dried material is discharged through a discharge hole of the drying device (5) and conveyed to a storage area (11) through a discharge belt (10).
  2. 2. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 1, wherein a material pre-drying platform (2) is built above the heat dissipation holes (12) by using a plurality of heat dissipation holes (12) formed in the kiln top of a kiln tail fire section (1), and a gap is reserved between the bottom of the material pre-drying platform and the heat dissipation holes (12).
  3. 3. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 1 or 2, wherein a plurality of spaced communication ports (4) and heat preservation covers (6) are arranged along the axial direction of the drying equipment (5), and the heat preservation covers (6) are correspondingly arranged above the communication ports (4) and wrap the drying body (9) of the drying equipment (5) in the circumferential direction.
  4. 4. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 1 or 2 is characterized in that the communication ports (4) are arranged, specifically, 1 or more communication ports (4) are opened at the position of a kiln tail fire section (1) close to the brick outlet (3), the width of the opening is 0.5m-1m, and channel steel and heat insulation cotton are used for fixing and insulating protection around the opening to form the communication ports (4).
  5. 5. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 1 or 2, wherein a drying body (9) of the drying equipment (5) is supported by a shaft box base and a cast steel diaphragm, the cast steel diaphragm is fixedly sleeved on the drying body (9), the cast steel diaphragm is matched with the shaft box base and rotates, a cast steel gear ring is fixedly sleeved on the drying body (9), and the gear ring is meshed with a speed reduction driving device, and the speed reduction driving device drives the drying body (9) to rotate.
  6. 6. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 5, wherein the drying body (9) is formed by rolling a steel plate with the thickness of 5-20 mm into a circle center roller with the diameter of 1-3 m, a feeder and a discharger are respectively assembled at two ends of the drying body (9) to form the feed inlet and the discharge outlet, and a moisture discharging fan is arranged at the position of the discharge outlet of the drying body (9) and used for discharging moisture from materials in the drying body (9).
  7. 7. The method for drying raw materials by using waste heat of a baked brick kiln according to claim 1 or 2, wherein an induced draft fan is arranged on the heat preservation cover (6), an air outlet of the induced draft fan is connected with a kiln flue (18), and the temperature in the heat preservation cover (6) is controlled by controlling the air quantity of the induced draft fan.
  8. 8. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 7, wherein a flashboard for closing or opening the communication port (4) is arranged at the communication port (4), and the air quantity of the communication port (4) and an induced draft fan is controlled by controlling the flashboard to open and close, so that the temperature in the heat preservation cover (6) is controlled.
  9. 9. The method for drying raw materials by using waste heat of a brick sintering kiln as set forth in claim 5, wherein a feed inlet dust return pipeline (13) is arranged at the feed inlet position of the drying equipment (5), a cyclone dust collector (14) and a fan (15) are arranged on the feed inlet dust return pipeline (13), and finally the raw materials are connected into a dust fall tank (16).

Description

Method for drying raw materials by using waste heat of brick sintering kiln Technical Field The invention relates to the technical field of baking of raw materials of baked bricks, in particular to a method for baking raw materials by using waste heat of a baking kiln. Background With the continuous development of society, the kiln waste heat utilization and drying technology is also more and more perfect. The existing kiln waste heat utilization and drying technology at least comprises a conveying mechanism, a dryer, a fan and the like. And the utilization efficiency of the waste heat is particularly important for the waste heat utilization and drying process of the kiln. The utility model patent with the name of a tunnel kiln top-mounted sludge drying system is disclosed as CN218372073U, the publication date is 2023, 1 month and 24 days, the top of a cooling section of the tunnel kiln is provided with a ventilation opening, a sludge dryer is arranged above the ventilation opening, and the ventilation opening is communicated with the bottom of a drying inner cavity of the sludge dryer. The utility model utilizes the waste heat of the tunnel kiln to dry the sludge, and directly communicates the ventilation opening with the drying cavity of the sludge dryer, so that the waste heat of the tunnel kiln directly enters the drying cavity of the dryer to dry the sludge conveyed in the dryer. The treatment mode reduces the arrangement of the pipelines and avoids the heat loss when the hot gas is transported in the pipelines. The waste heat output from the cooling section of the tunnel kiln directly acts on the inside of the dryer, on one hand, the drying temperature cannot be controlled, the high-temperature waste heat output from the cooling section of the tunnel kiln causes high-temperature damage to the inside of the dryer and affects the service life of the dryer, on the other hand, the high-temperature waste heat output from the cooling section of the tunnel kiln is actually the flue gas of the tunnel kiln, the flue gas of the cooling section of the tunnel kiln directly acts on the sludge raw material, sulfide and the like mixed in the flue gas can be doped in the raw material, so that the sulfur content of the raw material is greatly increased, the performance of the raw material is affected, part of flue gas can be mixed when the dried raw material is discharged, a certain amount of flue gas is discharged to the outside, meanwhile, the waste heat enters the inside of the dryer to cause wind pressure, the raw material inside is blown out from the other end of the dryer along with wind pressure, the material loss is large, the gas discharge amount is large, and the environment protection requirement is not met. Disclosure of Invention In order to overcome the defects and shortcomings in the prior art, the invention provides a method for drying raw materials by using waste heat of a sintered brick kiln, and aims to solve the problems that the drying temperature cannot be effectively controlled, the performance of the raw materials is affected by smoke in the kiln and the smoke in the kiln escapes in the existing kiln waste heat drying technology. The method comprises the steps of firstly building a material pre-drying platform on the top surface of a tail fire section of a brick sintering furnace, paving the material on the pre-drying platform, transferring the waste heat emitted by the tail fire section of the furnace to the material through the material pre-drying platform, evaporating part of water by using the waste heat of the tail fire section of the furnace before the material enters a dryer, improving the drying efficiency of rear-end drying equipment, arranging a communication port at the top of the tail fire section of the furnace, which is close to the brick outlet direction, erecting a dryer with a drum type, chain plate type, metal mesh belt type and other structures above the communication port, arranging a heat-preserving structure outside the dryer, and covering the heat-preserving structure on the dryer and the communication port, so that the waste heat led out by the communication port is in a heat-preserving cavity formed by the heat-preserving structure, and the outward dissipation of smoke in the kiln is avoided, and the environmental pollution is caused. The waste heat of the tail fire section of the kiln is led out through the communication port to act on the cylinder body of the dryer, and then is conducted to the materials in the dryer through the cylinder body of the dryer, so that the contact between kiln flue gas and the materials is isolated, the performance and sulfur content of the materials are prevented from being influenced, and dust pollution caused by the loss and wind pressure of the materials is avoided. The heat preservation structure avoids the dissipation of the smoke and is beneficial to the control of the drying temperature. In order to solve the problems in the prior