The invention discloses a spherical 
flue element 
equivalent model thermotechnical waterpower experimental apparatus comprising a pressure-bearing component, an 
electric heating component, an insulation component, a seal component, a 
pressure measurement component and the like, and field 
assembly and disassembly can be realized between the components. According to the spherical 
flue element 
equivalent model thermotechnical waterpower experimental apparatus, a banded fin thin rod bundle electric element is taken as an 
equivalent model structure of the spherical 
flue element, electrical heating method is realized, single-phase 
water flow and 
heat transfer experiment can be developed, and thermal-hydraulics of the spherical flue element can be reflected. The 
pressure measurement component can be assembled and disassembled on spot, 
consumables such as an O-shaped seal ring and a lead 
pressure pipe are convenient to replace, thereby reducing loss and cost. A grid spacer plays a role in 
transverse orientation for the banded fin thin rod bundle electric element, and a single-cone structure of the grid spacer can guide a plurality of the banded fin thin rod bundles to assemble, thereby reducing the difficulty of assembling and improving the efficiency of assembling. 
Copper braid is adopted to connect a lower conducting element and a lower conductive contact to realize flexible connection, so that the problem caused by electric component 
thermal expansion is effectively solved.