New construction and renovation of various heating furnaces, general contracting of energy saving, emission reduction and environmental protection projects related to metallurgical fields and heating furnaces (ie EPC projects): One is the new construction and renovation of steel rolling heating furnaces, including various heating furnaces, such as walking furnaces. , push steel furnace, slab, bar wire, round bar heating furnace, heating furnace with conventional combustion technology and regenerative combustion technology, as well as heating furnaces for various steel pipes, round bars, steel ingots, heat treatment furnaces, etc.; the second is Energy saving, emission reduction and environmental protection project Shanghai Xuanding can provide an integrated and complete set of comprehensive solutions for the production process of iron and steel enterprises; blast furnace gas equalization recovery, rest air release, blast furnace gas source fine desulfurization, sintering flue gas circulation, slag stewing / rolling mill / Sintering wet dust removal, heating furnace gas backflushing, heating furnace flue gas desulfurization, dust removal and denitrification, heating furnace fixed bed dry desulfurization, heating furnace fixed bed dry desulfurization and denitrification integrated, etc.;