Fire prevention equipment and spraying method
Fire-extinguishing agent supplying equipment pressurizes a water-based fire-extinguishing agent and supplies the agent via a pipe; and the water-based fire-extinguishing agent is pressurized and supplied via the pipe to an electrification spray head installed in a protection area A, and the jetted particles of the fire-extinguishing agent are electrified and sprayed from the electrification spray head. A pulsed or alternating electrification voltage is applied to the electrification spray head from a voltage application unit 15 , and an external electric field generated by applying the voltage between a water-side electrode unit and an induction electrode unit is applied to the fire-extinguishing agent in a jetting process to electrify the jetted particles.
1. An electrification spray head comprising:
an injection nozzle for converting a water-based fire-extinguishing agent to particles and spraying the particles by jetting the fire-extinguishing agent to an external space;
an induction electrode unit disposed in a jetting space side of the injection nozzle; and
a water-side electrode unit disposed in the injection nozzle and brought into contact with the water-based fire-extinguishing agent,
wherein an external electric field is generated by applying a voltage between the induction electrode unit and the water-side electrode unit to the water-based fire-extinguishing agent in a jetting process from the injection nozzle.
2. The electrification spray head according to claim 1 , wherein the water-side electrode unit is part of the injection nozzle using an electrically conductive material or a pipe using an electrically conductive material.
3. The electrification spray head according to claim 1 , wherein the induction electrode unit is any of or a complex of a metal having electric conductivity, a resin having electric conductivity and a rubber having electric conductivity, and has any of a ring shape, a cylindrical shape, a vertical flat-plate shape, a parallel-plate shape, a linear shape and a wire-mesh shape.
4. The electrification spray head according to claim 1 , wherein a voltage of the water-side electrode unit is to be zero volts, the water-side electrode unit is led to earth, and a predetermined electrification voltage is applied to the induction electrode unit.
5. The electrification spray head according to claim 4 , wherein the predetermined electrification voltage applied to the induction electrode unit is a DC, AC, or pulsed electrification voltage.
6. The electrification spray head according to claim 4 , wherein the predetermined electrification voltage applied to the induction electrode unit is less than ±20 kilovolts.
7. The electrification spray head according to claim 1 , wherein part or all of the induction electrode is coated with an insulating material.
8. The electrification spray head according to claim 1 , wherein the water-based fire-extinguishing agent is water, seawater, or water containing a fire-extinguishing power enhancing chemical agent.