BHEL set to produce supercritical boilers
It has manufactured associated valves and piping
products adaptable to the machine tools for handling larger sizes,
intricate assemblies, and advanced materials, according to its annual
report. By manufacturing 2.5 lakh valves, the Tiruchi unit has increased
its volume of production by 18 per cent. Shop trial assemblies of
hopper to furnace transition panels and hopper to spiral furnace wall
panels were carried out for the first time.
Unique
components such as connecting sphere, mixing sphere, intricate burner
panels, headers of 2.7-metre height, and wind box of 16.7-metre height
weighing 42 tonnes were successfully manufactured for the first time for
supercritical boilers. A record number of 300 coal feeders and over 150
wind boxes were dispatched during the year. Other components
manufactured for the first time include P92 headers of 660 mm X 120 mm
outer diameter and up to 120 mm wall thickness, P91 headers of up to 813
mm diameter, economiser coils from 135-metre-long tubes built up using
straight tube butt joints and forged high pressure valves of F91
material.
New manufacturing processes developed and
established include fabrication of panels and coils using new materials.
Design changes were made in coils for super critical boilers to
eliminate the need for normalising and tempering after bending. Direct
bending of ferritic steel tubes with close bend radius eliminated the
need for hot squeezing, normalising, and tempering in furnace for T23
tubes.
The unit added a new facility for the
manufacture of wall blowers. Innovative methods were adopted and
modifications were made to tools and fixtures for cycle time reduction.
Innovations were also introduced to reduce site work and erection time.
A
new rack-type soot-blower was manufactured and supplied to TNPL,
Pugalur. The unit also established tube to tube-sheet weld joints with
close pitch in titanium heat exchanger.
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