The three elements of combustion are: oxygen, sparks, and combustibles. Without any of them, burning will not occur. At the solvent recovery site, oxygen and combustibles are present, so the only controllable thing is that there should be no sparks.
Therefore, the solvent recovery machine is designed with professional explosion-proof settings in any place where sparks may be generated. For example, the electric control system is set in a closed explosion-proof box, 100% explosion-proof, and the heating system is explosion-proof. The cooling system is also explosion-proof to avoid electric sparks.
