Metering system, dense phase conveying system and method for supplying bulk material in powder form

A metering device comprising a metering container, at least one airlock arranged upstream of the metering container, a supply device, and a pressure regulation device for regulating a differential pressure between the metering container and a consumer,

• wherein the metering container provides for the steady, continuous, dosed supply of the bulk material in a powder form made of light, polydisperse particles from the supply device into a plurality of conveying tubes to a consumer arranged downstream of the conveying tubes,
• wherein a mass flow measuring probe is arranged on each conveying tube,
• wherein the metering container and the airlock each comprise a delivery device,
• wherein the delivery device corresponding to the metering container comprises a plurality of dust flow regulation devices associated with the plurality of the conveying tubes,
• wherein each dust flow regulation device is associated with a respective conveying tube and opens therein,
• wherein the mass flow measuring probe of each conveying tube is coupled to a dust flow regulation device, which opens into the corresponding conveying tube, and
• wherein the delivery device of the airlock is connected via a dust flow regulation device into the metering container,
• wherein the pressure regulation device is coupled to a first pressure measuring device assigned to the airlock and a second pressure measuring device arranged on the metering container for a first differential pressure regulation between an airlock pressure and a metering container pressure and is coupled to a third pressure measuring devices assigned to the delivery devices of the metering container and a fourth pressure measuring devices of the consumer for a second differential pressure regulation between a metering container delivery pressure and a consumer pressure
• wherein the regulation of the differential pressure between the metering container and the consumer by the pressure regulation device is comprised by the second differential pressure regulation,
• wherein the metering container pressure is controllable as a function of at least the second differential pressure regulation by the pressure regulation device, and
• wherein the pressure regulation device is coupled to a fifth pressure measuring device assigned to the supply devices and the first pressure measuring devices of the airlock for a first differential pressure control between a supply device pressure and the airlock pressure
• wherein the metering device comprises at least one suction device that is coupleable with the airlock and capable of generating a partial vacuum in the airlock in relation to a pressure in the supply device, by means of actuating devices that comprise a plurality of regulating and shutoff valves in a pressurization gas line, depressurization gas line, and a swirl gas line or acceleration and delivery gas line leading to the airlock and that are activatable by the pressure regulation device, and
• wherein the airlock pressure is controllable by the pressure regulation device as a function of at least one airlock fill level and the first differential pressure control by an actuation of the at least one suction device and actuation of the plurality of regulating and shutoff valves.