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CN-122012121-A - Method for preassembling outlet arch of coke dry quenching chamber

CN122012121ACN 122012121 ACN122012121 ACN 122012121ACN-122012121-A

Abstract

The application relates to the technical field of dry quenching technology, in particular to a method for preassembling an outlet arch of a dry quenching chamber of dry quenching, which adopts a mullite brick layer and staggered brick layer composite masonry technology and comprises the following steps of S1, pre-assembling preparation and reference calibration in the early stage; S2, basic building of the bottom mullite brick layer, S3, composite building and occlusion positioning of staggered brick layers, S4, layered pre-pressing and defect detection, and S5, integral fixing and identification transferring. The pre-assembled arch body has remarkable comprehensive performance, high compressive strength at 25 ℃ and high temperature, strong thermal shock resistance and low high temperature creep rate, adopts mullite brick preheating treatment, staggered brick concave-convex engagement structure and reasonable staggered joint arrangement, and improves the attaching compactness and structural stability of the brick body in a mode of gradually increasing and prepressing from arch feet to arch tops in a layering manner. The arch body prepared by the method has high temperature resistance, deformation resistance and strong thermal shock resistance, can adapt to the severe working condition of a dry quenching chamber, and prolongs the service life of the arch body.

Inventors

  • QIAN JING
  • QIAN ZHIMING
  • LIU CHENGQIANG
  • BAI YINGYING
  • ZHU XIUFEN

Assignees

  • 江苏诺明高温材料股份有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. A method for preassembling an arch at an outlet of a coke dry quenching chamber is characterized by adopting a mullite brick layer and staggered brick layer composite masonry process, and specifically comprises the following steps of S1, pre-assembling preparation and reference calibration, S2, bottom mullite brick layer reference masonry, S3, staggered brick layer composite masonry and occlusion positioning, S4, layering prepressing and defect detection, and S5, integral fixing and identification transfer.
  2. 2. The method for preassembling the outlet arch of the coke dry quenching chamber according to claim 1, wherein in the step S1, an arc-shaped preassembled platform matched with the actual working condition of the outlet arch of the coke dry quenching chamber is built, a high-temperature-resistant anti-slip cushion layer is paved on the surface of the platform, and a fine-tuning lifting mechanism is arranged at the bottom of the platform.
  3. 3. The method for pre-assembling the outlet arch of the dry quenching chamber according to claim 1, wherein in the step S2, the mullite brick is required to be heat-preserved for 1.5-2 hours at 80-100 ℃, the temperature is raised to 150-200 ℃ at a temperature raising rate of 1-3 ℃ per minute, the temperature is preserved for 2-3 hours, the temperature is lowered to 120-140 ℃ at a temperature lowering rate of 1-2 ℃ per minute, and the temperature is preserved for 0.5-1 hour.
  4. 4. The method for preassembling the arch at the outlet of the dry quenching chamber according to claim 2, wherein the high-temperature-resistant anti-slip cushion layer has a Shore hardness of 65-75HA, a compressive strength of >15MPa at 25 ℃, a retention rate of compressive strength of not less than 80% at 300 ℃, and a friction coefficient of not less than 0.8.
  5. 5. The method for pre-assembling the arch at the outlet of the dry quenching chamber according to claim 1, wherein in the step S2, a bottom mullite brick layer is laid by adopting a mode of symmetrically laying from arch feet to the arch crown on the basis of a laying reference surface, 3-5 bricks are laid each time, namely, the flatness of the brick layer is detected by adopting a guiding rule, the deviation of the flatness is not more than 0.4mm/m, a temporary positioning reference pile is arranged at the center of the arch crown after the brick is laid to the arch crown position, the adjacent mullite bricks are filled with high-temperature refractory slurry, and the slurry thickness is controlled to be 2-3mm.
  6. 6. The method for preassembling the outlet arch of the dry quenching chamber according to claim 5, wherein the refractoriness of the high-temperature refractory slurry is higher than 1750 ℃, the compressive strength is higher than 30MPa at 25 ℃, the compressive strength is higher than 25MPa at high temperature, and the slurry is required to be uniformly stirred during construction.
  7. 7. The method for pre-assembling the outlet arch of the dry quenching chamber according to claim 1, wherein in the step S3, a concave-convex engagement structure matched with the mullite brick layer is arranged on the overlapping surface of the staggered bricks, and the concave-convex engagement depth is 8-12mm.
  8. 8. The method for preassembling the outlet arch of the dry quenching chamber according to claim 7, wherein the center line of the staggered bricks is staggered with the center line of the brick joint of the bottom mullite brick layer by a distance of 1/3-1/2 of the width of the brick body, and radial displacement and circumferential radian are calibrated by a laser positioner after each staggered brick layer is built.
  9. 9. The method for pre-assembling the arch at the outlet of the dry quenching chamber according to claim 1, wherein in the step S4, the pre-pressing pressure is gradually increased from the arch foot to the arch crown, and the specific increasing mode is that the arch foot is taken as a starting end, the reference pre-pressing pressure of 0.3-0.5MPa is firstly applied, then the arch crown is pressurized in a segmented mode along the radian of the arch body, the pressurizing gradient of each segment is controlled to be 0.1-0.2MPa, the arch crown is gradually transited to an arch crown area, the final arch crown pre-pressing pressure is stabilized to be 0.8-1.0MPa, the pre-pressing time of each area of the whole arch is controlled to be 30-40min, and an ultrasonic flaw detector is adopted to detect the brick layer fitting degree after the pre-pressing is completed.
  10. 10. The method for preassembling the arch at the outlet of the coke dry quenching chamber according to claim 1, wherein in the step S5, a detachable clamp is used for integrally fixing the arch body, a flexible protection pad is arranged at the contact part of the clamp and the brick body, and after the arch body is marked with partition numbers, the arch body is horizontally transferred to a storage area and collision vibration is avoided.

Description

Method for preassembling outlet arch of coke dry quenching chamber Technical Field The application relates to the technical field of dry quenching processes, in particular to a method for preassembling an outlet arch of a dry quenching chamber of dry quenching. Background The dry quenching technology is used as an energy-saving and environment-friendly coke cooling process, and the operation stability of a dry quenching furnace of core equipment directly influences the production efficiency and the safety. The arch at the outlet of the dry quenching chamber is used as a key bearing and flow guiding component of the outer wall of the dry quenching furnace and is in an arch bridge shape, so that the arc degree of the outer wall of the dry quenching furnace is matched, the arch span requirement of the annular air duct for the gas flowing to the primary dust remover is met, and the assembly precision directly determines the follow-up gas circulation efficiency and the sealing performance of equipment. The outlet arch is generally formed by bricking an mullite brick layer and a staggered brick layer in an upper layer and a lower layer, the whole weight is about 18 tons, and the single brick body has large weight and extremely high assembly difficulty. The existing preassembling process generally adopts a wooden mould to carry out positioning support, fixing tools are additionally arranged at two ends of the mould to prevent the masonry from sliding towards two ends, a special tool table is required to be built for paving the upper masonry, the construction process is complex, the labor intensity is high, the wooden mould is required to meet the high-strength bearing requirement, and the manufacturing cost is high. Meanwhile, wood materials are easy to deform under the influence of environmental humidity and temperature, so that the preassembly size is difficult to accurately control, the problems of dislocation of brick joints, arc deviation and the like frequently occur, and further the sealing performance is insufficient during field installation, the leakage risk of high-temperature gas is increased, and the overall operation stability and the service life of the dry quenching furnace are influenced. In addition, the wooden mould foundation stability is poor, easily takes place to collapse hidden danger when high altitude construction, and the security risk is higher. Therefore, a low-cost, high-precision and high-safety preassembling method for the outlet arch of the dry quenching chamber of the dry quenching is needed to solve the pain point in the prior art. Disclosure of Invention In order to solve the technical problems in the background technology, the application provides a preassembling method of an outlet arch of a dry quenching chamber for dry quenching. A pre-assembly method for an arch at an outlet of a coke dry quenching chamber adopts a mullite brick layer and staggered brick layer composite masonry process, and specifically comprises the following steps of S1, pre-assembly preparation and reference calibration, S2, basic mullite brick layer basic masonry, S3, staggered brick layer composite masonry and occlusion positioning, S4, layered pre-pressing and defect detection, and S5, integral fixation and identification transfer. Preferably, in the step S1, an arc-shaped preassembled platform matched with the actual working condition of the outlet arch of the dry quenching chamber is built, a high-temperature-resistant anti-slip cushion layer is paved on the surface of the platform, and a fine-tuning lifting mechanism is arranged at the bottom of the platform. Preferably, the Shore hardness of the high-temperature-resistant anti-slip cushion layer is 65-75HA, the compressive strength at 25 ℃ is more than 15MPa, the retention rate of the compressive strength at 300 ℃ is more than or equal to 80%, and the friction coefficient of the cushion layer is more than or equal to 0.8. Preferably, in the step S2, the mullite brick is required to be heat-preserved for 1.5-2 hours at 80-100 ℃, the temperature is raised to 150-200 ℃ at a heating rate of 1-3 ℃ per minute, the temperature is preserved for 2-3 hours, the temperature is lowered to 120-140 ℃ at a cooling rate of 1-2 ℃ per minute, and the temperature is preserved for 0.5-1 hour. Preferably, in the step S2, a bottom mullite brick layer is laid by taking a masonry datum plane as a support and adopting a symmetrical masonry mode from arch feet to a vault, 3-5 bricks are built by each time, namely, the flatness of the brick layer is detected by adopting a guiding rule, the flatness deviation is not more than 0.4mm/m, a temporary positioning datum pile is arranged at the center of the vault after the bricks are built to the vault, high-temperature refractory slurry is filled between every two adjacent mullite bricks, and the slurry thickness is controlled to be 2-3mm. Preferably, the refractoriness of the high-temperature refractory slurry is higher than 175