How can a spirit burn in Hell?

Hell was not created for mankind but specifically for Satan and the fallen angels (Matthew 25:41); mankind will enter Hell by choice/free will through unbelief; that is, rejecting faith in Jesus as Lord who died to pay our sin-debt (John 14:6; John 3:16-18; John 8:24). Mankind who has rejected Jesus will not stand in the Judgment of the Condemned (Revelation 20:11-15) in spiritual form only but those who stand in the Great White Throne Judgment will have received a resurrected body of corruption (John 5:29) as they are extricated from Hades/Sheol-Torments (Luke 16) and they will be judged in that body of corruption for the sin they have committed during their life constrained by Time and physics; the condemned will be adjudicated “guilty” for sin and their name will not be found written in the Lamb’s Book of Life and they will be cast into the Lake of Fire/Gehenna and they will suffer commensurate to the evil done in their body while in Time and then die the “second death” for eternity in nihilism and meaninglessness.

The second death is necessary as nothing impure is permitted to enter the Kingdom of God (Revelation 21:27) and only those who have received forgiveness of sin and the imputation of Messiah Jesus’ righteousness into their life by faith in Him as their Lord (2 Corinthians 5:21) will be resurrected in righteousness (Luke 14:14; John 5:29) and receive a resurrected body likened to that of Jesus Himself (Philippians 3:21) and these will enter the New Jerusalem (Revelation 21) and serve Jesus Christ forever to glorify our Lord for what He has done for us by selfless love in defeating the Evil One (1 John 3:8b).