Re- heat boiler tube wall comb through modification of the sealing plate

Comb-shaped sealing plate is modified reheat type folding comb sealing plate to locate the seal plate (12Cr1MoV, δ8), positioning the sealing plate processing when a uniform length and width of the plate after marking , according to the reheater pipe diameter (D64mm) drilled hole , and then follow the protective casing diameter (D68mm) machined counterbore depth of 3mm . Reheater embedded in the protective sleeve by positioning the sealing plate , to ensure the pitch between the tubes , reducing the swing tube rows . Meanwhile , this welded structure is simple, convenient , to further improve the welding quality, avoid the folding -type comb -shaped seal plate complex produced by processing and assembly difficulties deviation , thereby preventing the seal lower quality weld .
Installation of protective casing protective casing installation transition purposes : ( 1 ) casing material and its internal wall pipe of the same material , in order to ensure that the work of the tube with protective sleeve seam welded joints using the same kind of steel , will be transferred to the dissimilar steel welded joints with protective sleeve positioned between the seal plate welds , improved wall pipe work weld crack resistance ; ( 2 ) protection tube wall thickness thinner than the reheater tubes , which specifications for D68mm × 3mm, reducing its structural rigidity makes sealing welding deformation transferred to the casing ,indicative seals eliminating the formation of geometric stress concentration points , improved wall pipe work weld the force .
Construction should pay attention to the problems of access to the site reheater tube wall spectrum in addition to a 100% and 100% visual inspection , but also deal fillet weld pipe through the wall set at 100 % of the magnetic memory testing , to prevent unqualified ( exist melting wear , weld defects such as abnormal stress concentration ) pipe is used.
Note wall pipe positioning in the high roof pitch , the tube is in the process of looking for prohibited the use of flame cutting tools, in order to avoid the flame burn or cut high roof inside reheater tubes . Guaranteed replacement wall pipe before and after the reheater tubes mounted side elevation of the same, to prevent the tube rows down and obscure corner wall tube row spacing becomes smaller , resulting reheater appear swollen outer pipe blocked situation. As of May 31, 2006 , the 2nd boiler reheater wall pipe after 22961h and 24762h running test , the sealing structure fillet weld no cracking spill accident to 0.1 yuan / (kWh) of electricity generation efficiency calculations, due to wear caused by burst pipes forced outage one day loss of power caused by substitution are: 250,000 kWh × 0.1元(kWh) -1 × 24h = 60 Million / day Therefore, these measures effectively reduce the wear and tear squib the number of very substantial economic benefits strap seals .
Medium temperature, high temperature reheater wall pipe sealing structure optimization and transformation in reducing the number of burst pipes boiler repeatability and ensure safe operation of the boiler area , with significant economic and commercial integrated social benefits, while also having the same type of boiler better application value .