11 Equipment for steam generating and power generating comprising boilers, heat exchangers, water treatment units, scrubbers, burners, separators, economizers, de-ashers, degasifiers, firing systems, fans, hot gas generators, pulverizers, filters, waste heat recovery boilers, heaters, steam converters, condensers, expansion joints, steam drums, quench coolers, scraped-wall heat exchangers, dust collectors, feedwater tanks, reactors, superheaters, blowers, feeders; mechanical, hydraulic and pneumatic conveyors, vacuum and compressed air conveyors, conveyor belts including idlers and pulleys, cooling towers, cooling stacks, steel stacks, silencers, fans, blowers, wind tunnels, tunnel ventilation devices