Combination of pressure charging and metering for continuously supplying pulverized fuel into an entrained-flow gasifying reactor with long conveying distances

A system for the pneumatic feeding-in of pulverized fuel in which a H2- and CO-rich crude gas is produced by conversion of an entrained-flow gasifying reactor with oxygen or containing free oxygen, comprising:

• an untreated fuel stored in an untreated fuel silo is supplied to a device below the untreated fuel silo for drying and grinding the fuel to form powdery fuel,
• a filter, wherein the pulverized fuel is subsequently freed from an entrained drying and circulating gas as the pulverized fuel is passed through the filter,
• a plurality of combined powder-locking and metering vessels that are discontinuously or cyclically filled with the pulverized fuel and tensioned with fluidizing gas set under operating pressure, wherein the pulverized fuel is set under operating pressure and is introduced in a fluidized state,
• each of the combined powder-locking and metering vessels convey a defined flow of the fluidized pulverized fuel via an allocated powder-conveying line and an allocated control valve into a common conveying line,
• the entrained-flow gasifying reactor, wherein in the fluidized state, the pulverized fuel is supplied by continuous conveying through the common conveying line to the entrained-flow gasifying reactor,
• wherein the fluidized pulverized fuel is supplied continuously to the entrained-flow gasifying reactor by the desired value for mass-flow control of the pulverized fuel divided between the control valves of the powder-conveying lines of the plurality of combined powder-locking and metering vessels,
• a portion divider that displaces the desired value from a first control valve of the control valves to a second control valve of the control valves, wherein the desired value is displaced via ramping within the portion divider, wherein the time of the ramping is set, wherein the ramping exit out of the portion divider is multiplied by the desired value of the mass flow for the second control valve and, for the first control valve, the ramping exit out of the portion divider is subtracted from 1 and multiplied by the desired value of the mass flow,
• wherein in parallel to the activation of the control valves, a supply of fluidizing gas of the respective combined powder-locking and metering vessel assigned to the second control valve under fluidizing plates is started and the conveying begin.