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Discussions on Retrofit of Indigenous 1000t/h PU Boilers

QIAN Xin-ren  
There are twenty one 1000 im UP boilers now in operation in China.They are still major generating units in the large Power netWorks,but they suffer seriously from "bursting-leakage of four kinds of tubes" (tubes ofwater-wall, economizer , superheater and reheater ) and low reliability , and can only take base base load of about 240MW,not being able to meet the peaking demand under the new market economy,consequently it is imperative toretrofit these generating units.Jianbi Power Plant,adopting the retuofitting scheme of "retaining the rear part andframe of the original double furnace-UP type once-through boiler,while converting the furnace chamber to controlledcirculation system",took the lead to retrofit 1 000 t/h double furnace UP boiler with satisfactory results gained.Thearticle introduces in detail the feasibility argumentation, design, manufacturing, installation of retrofitting scheme , andthe positive results after retrofit.'
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