초록 ▼

The present invention provides a method and plant for the pneumatic transportation of solid particles in the form of a diluted phase through a conduit (1), with which the transport air in said conduit is given a velocity which is at most equal to the air velocity chosen for a maximum particle load l

The present invention provides a method and plant for the pneumatic transportation of solid particles in the form of a diluted phase through a conduit (1), with which the transport air in said conduit is given a velocity which is at most equal to the air velocity chosen for a maximum particle load level. The free flow from the pressurized air source (3) is regulated on the basis of measured air velocity or on the basis of a state corresponding thereto, such as air pressure in the conduit, and an established relationship between the free flow and the said measured velocity of the air or a state (pressure) corresponding thereto, essentially independently of the particle load. There is thus maintained in the conduit a preferably constant transport air velocity with all different occurring levels of particle load.

대표청구항 ▼

1. A method of pneumatically transporting material in a form of solid particles in a diluted phase through a conduit, wherein a varying material loading of transportation flow exists, and driving said particles along said conduit with an air flow delivered by a pressurized-air source located upstrea

1. A method of pneumatically transporting material in a form of solid particles in a diluted phase through a conduit, wherein a varying material loading of transportation flow exists, and driving said particles along said conduit with an air flow delivered by a pressurized-air source located upstream of a material infeed position, and a transport air velocity is chosen for a maximum material load on said air flow, the method comprising the steps of:establishing for a selected transport air velocity a relationship between a free flow of said pressurized-air source and a velocity of a transport air flow, or a state of said transport air flow corresponding thereto; detecting said velocity of said transport air flow, or a state of said transport air flow corresponding thereto; detecting said free flow of said pressurized-air source either directly or indirectly; calculating a control value with respect to said velocity of said transport air, or with respect to said state of said transport air flow corresponding thereto, and said relationship; and adjusting said free air flow from said pressurized-air source to bring a real value of said velocity of said transport air flow, or said detected state, into line with said control value, to establish an operable transport air velocity which is at most substantially equal to a chosen transport air velocity for said maximum material load, even when material loads are lower than said maximum material load.