The invention provides a
system and a method for intermittent negative-pressure pneumatic conveying for a
powder. The
system comprises a feeding device, a horizontal feeder, a conveying pipeline, a separator, a dust remover, a blowback device, an air source, auxiliary equipment and a control device. According to the
system and the method, the possibility of arching in a hopper and adhesion onto the wall of the hopper, of materials, is lowered, through using an air
nozzle air-supplementing device and the novel horizontal feeder; the safety of the system is improved through installing a
safety valve and a
vacuum pressure sensor; the cost is lowered and the floor area is reduced by virtue of the integrated structure of the separator and the dust remover; the
filter effect is enhanced and the number of filters is reduced through designing a filter with a novel structure; a pneumatic component and an
electromagnetic valve are matched by virtue of the characteristics of high flexibility and high reliability of a PLC; and the need of frequently starting up and turning off a
fan in order to realize an intermittent conveying manner at the present stage is avoided through using a
ball valve. The system provided by the invention has the advantages of being simple in structure, low in cost, high in
automation degree, high in conveying speed and the like, and reduces human labour.