Flexible double labyrinth seal at the kiln head the application of the sealing technology

Flexible double labyrinth seal in the kiln head seal technology, the application of 2018 - 11 - 30 hsiang-ming lee ( Smooth jidong cement co. , LTD. ) 1 there is a problem I company rotary kiln ( Φ 4 m× 60米) Kiln head seal is one of the most original scales plate seals, after many years of operation, the current problems are as follows: 1) Seal cover and cone flange deformation is serious, and on both sides of the flange interfaces appear larger deviation from top to bottom, their repair value. 2) The original single seal cover internal baffle ring structure, design is relatively backward, although a few times change, poor sealing effect, air leak phenomenon, can't satisfy the requirements of energy saving and consumption reducing as shown in figure 1. 3) Kiln shell has certain bending deformation, appear in running large deflection, the original seal can't meet the required amount of compensation. 4) Kiln production by the design of 2500 t/d, to about 2900 t/d clinker cooling after is poorer, to ensure the cooling of clinker, increased the grate cooler cooling air volume, lower the kiln head negative pressure ( - 10 ~ - 20Pa） Even a brief positive pressure. The above phenomenon in kiln head long-standing run material, air leakage phenomenon, serious impact on the environment health, exacerbating the kiln head wear of wheelset, to a certain extent affect the secondary air temperature, increase the coal consumption, harmful to the kiln calcine. Given the increasing environmental pressure, it is necessary for the kiln head seal a thorough technical renovation, solve the problem of leak leakage of material. 2 technical solutions in order to solve the above problems, through investigation in many ways and combined with the actual situation of the kiln head, my company decided to seal completely removed after use by tangshan is the mechanical equipment sales co. , LTD. , the flexible double labyrinth seal technique. Sealed enclosure new double double seal of labyrinth seal + flexible composite board seal, as shown in figure 2. New double labyrinth seal USES two groups of dislocation 'L' shaped baffle ring, to fly out of the materials are level 4 block to slow down, As shown in figure 2 the annotations: Ⅰ, Ⅱ, Ⅲ, Ⅳ) Retaining ring using heat-resistant steel ( 1Cr18Ni9Ti） Production, effectively prevent hot bending deformation, prolong service life. Flexible composite board seal USES the three layers of sealing material from inside to outside, in order: the first layer, heat resistant steel ( 1Cr18Ni9Ti） 1, the plate thickness. 2 mm, its front-end wear-resistant parts of 2 times the thickness ( 2. 4毫米) And prolong its service life; The second layer, silica alumina carbon fiber composite board, is a kind of high temperature resistance, wear resistance and half flexible new type of composite materials; The third layer, finishing steel plate, used to protect and fixed composite panels. The seal has stronger compensation amount and wear resistance, can effectively reduce the air leakage coefficient. 3 the construction process 1) Early production seal cover, 'L' shaped baffle ring up and down, the cone flange welding parts, such as and extend cold wind set on the basis of the original length 200 mm. 2) Stop kiln and cools remove the original sealing device and the cold wind, the kiln head cover and seal cover welding interface burnish is flat and level. 3) Install the new air cooling set, make sure air cooling completely in kiln mouth set of heat-resistant parts protection card slot, the cold wind set of inlet positioning in the form of spring plate fixation. 4) Cold wind set after the installation, welding seal cover, full welding, weld height shall be not less than 10 mm, stiffened plates and increase triangle, circumferential spacing is 500 mm. 5) Will ring under the set of the outer surface of welding in the cold wind, that when the welding position in cold distance ring axial clearance of 240 mm. 6) The cone flange plate fixed with seal cover flange connection. 7) Installation of flexible composite plate seal. 8) Tension device installation, commissioning. 4 technical effect because the seal structure has closed, the flexible strong, moderate hardness, wear resistance, high temperature resistance and other characteristics, sealing element can changes over the kiln body, so as to adapt to rotary kiln used in high temperature condition of deformation and the deflection and eccentric. After technical renovation can solve run material problems of kiln head seal, air leakage phenomenon largely disappeared, to improve the secondary air temperature, ensure the kiln head negative pressure, reduce the coal consumption, conducive to innovation calcining kiln.