Pulverized coal fineness on-line measurement optical element protection device

The invention discloses a pulverized coal fineness on-line measurement optical element protection device which comprises a measurement cavity, a shielding gas system, an optical channel and a measurement system, the measurement cavity is provided with the optical channel, the tail end of the optical channel is provided with the measurement system, the optical channel is provided with the shieldinggas system, and the shielding gas system is provided with the shielding gas system. And the shielding gas system is used for spraying high-speed gas to form a gas curtain so as to prevent pulverizedcoal particles entering the optical channel from adhering to or removing the particles adhered to the optical element in the measuring system. The pulverized coal fineness on-line measurement opticalelement protection device provided by the invention can prevent pulverized coal particles from adhering to an optical element to affect measurement, and the measurement stability is improved. 本发明公开了一种煤粉细度在线测量光学元件保护装置，包括测量腔、保护气系