Method and a device for measuring and/or regulating the mass flow of solid particles

Claim 1

A method of measuring and regulating mass flow of particles in a transported solid particle-gas suspension through a conveyor pipeline having a first constriction and a second constriction downstream of said first constriction and a gas pipe connected to said conveyor pipeline between said two constrictions, comprising the steps of: (a) changing the quantity of the carrier gas in said suspension by removing or supplying carrier gas through said gas pipe; (b) measuring a first pressure differential across the first constriction and a second pressure differential across the second constriction; (c) determining the mass flow rate, in mass units per time units, of the transported particles responsive to the difference between the first and second pressure differential in accordance with the relationship ##EQU3## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe and (Δp 2 -Δp 1 ) is the difference between the second and first pressure differential.

Claim 2

A method of measuring and regulating mass flow of particles in a transported solid particle-gas suspension through a conveyor pipeline having a first constriction and a second constriction downstream of said first constriction and a gas pipe connected to said conveyor pipeline between said two constrictions, comprising the steps of: (a) changing the quantity of the carrier gas in said suspension by removing or supplying carrier gas through said gas pipe; (b) measuring a first pressure differential across the first constriction and a second pressure differential across the second constriction; (c) determining the mass flow rate, in mass units per time units, of the transported particles responsive to the difference between the first and second pressure differential in accordance with the relationship ##EQU3## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe and (Δp 2 -Δp 1 ) is the difference between the second and first pressure differential.

Claim 8

A device for measuring and regulating the mass flow of solid particles in a transported solid particle-gas suspension, comprising: a conveyor pipeline for transporting said solid particle-gas suspension; a gas pipe connected to said conveyor pipeline for removing or supplying carrier gas from or to, respectively, said conveyor pipeline at a predetermined position; a first constriction in said conveyor pipeline upstream of said predetermined position; a second constriction in said conveyor pipeline downstream of said predetermined position; first means responsive to a pressure drop across said first constriction for measuring the pressure drop across said first constriction; and second means, responsive to a pressure drop across said second constriction, for measuring the pressure drop across said second constriction; and means for determining the difference between the pressure drops across the first and second constrictions and the mass flow rate, in units of mass per time, of the solid particles, responsive to said first means and second means in accordance with the relationship ##EQU4## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe, (Δp 2 -Δp 1 ) is the difference between both said pressure drops.

Claim 9

A device for measuring and regulating the mass flow of solid particles in a transported solid particle-gas suspension, comprising: a conveyor pipeline for transporting said solid particle-gas suspension; a gas pipe connected to said conveyor pipeline for removing or supplying carrier gas from or to, respectively, said conveyor pipeline at a predetermined position; a first constriction in said conveyor pipeline upstream of said predetermined position; a second constriction in said conveyor pipeline downstream of said predetermined position; first means responsive to a pressure drop across said first constriction for measuring the pressure drop across said first constriction; and second means, responsive to a pressure drop across said second constriction, for measuring the pressure drop across said second constriction; and means for determining the difference between the pressure drops across the first and second constrictions and the mass flow rate, in units of mass per time, of the solid particles, responsive to said first means and second means in accordance with the relationship ##EQU4## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe, (Δp 2 -Δp 1 ) is the difference between both said pressure drops.

Claim 16

A method of measuring and regulating mass flow of particles in a transported solid particle-gas suspension through a conveyor pipeline having two constrictions and a gas pipe connected to said conveyor pipeline between said two constrictions, comprising steps of: (a) measuring a pressure drop across one of said constrictions; (b) measuring a pressure drop across the other of said constrictions; (c) calculating solid particle mass flow rate, in mass units per time units, on the basis of a difference in said pressure drops measured in said steps (a) and (b) in accordance with the relationship ##EQU5## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe, (Δp 2 -Δp 1 ) is the difference between the second and first pressure drops.

Claim 17

A method of measuring and regulating mass flow of particles in a transported solid particle-gas suspension through a conveyor pipeline having two constrictions and a gas pipe connected to said conveyor pipeline between said two constrictions, comprising steps of: (a) measuring a pressure drop across one of said constrictions; (b) measuring a pressure drop across the other of said constrictions; (c) calculating solid particle mass flow rate, in mass units per time units, on the basis of a difference in said pressure drops measured in said steps (a) and (b) in accordance with the relationship ##EQU5## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe, (Δp 2 -Δp 1 ) is the difference between the second and first pressure drops.

Claim 18

A device for measuring and regulating the mass flow of solid particles in a transported solid particle-gas suspension, comprising: a conveyor pipeline for transporting said suspension; a gas pipe connected to said conveyor pipeline for changing the amount of carrier gas for said suspension; a first constriction upstream of said gas pipe; a second constriction downstream of said gas pipe; first gauge means responsive to a pressure drop across said first constriction for measuring the pressure drop across said first constriction; second gauge means responsive to a pressure drop across said second constriction for measuring a second pressure drop across said second constriction; control means, responsive to said first and second gauge means, for calculating a solid particle mass flow rate, in units of mass per time, on the basis of said first and second pressure drops in accordance with the relationship ##EQU6## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe, (Δp 2 -Δp 1 ) is the difference between the second and first pressure drops.

Claim 19

A device for measuring and regulating the mass flow of solid particles in a transported solid particle-gas suspension, comprising: a conveyor pipeline for transporting said suspension; a gas pipe connected to said conveyor pipeline for changing the amount of carrier gas for said suspension; a first constriction upstream of said gas pipe; a second constriction downstream of said gas pipe; first gauge means responsive to a pressure drop across said first constriction for measuring the pressure drop across said first constriction; second gauge means responsive to a pressure drop across said second constriction for measuring a second pressure drop across said second constriction; control means, responsive to said first and second gauge means, for calculating a solid particle mass flow rate, in units of mass per time, on the basis of said first and second pressure drops in accordance with the relationship ##EQU6## where m is mass flow rate (mass/time), p is initial pressure, q is a cross-section of said constrictions, p o is normal pressure, v o is the amount of carrier gas transmitted through said pipe, (Δp 2 -Δp 1 ) is the difference between the second and first pressure drops.