Equalized injection of pulverized fuels with fixed restriction point in the pulverized fuel conveyor line

Abstract

An apparatus for constant feeding of pulverized fuels at ambient or elevated pressure having a fixed restrictor device in the pulverized fuel conveyor line connecting a metering vessel to a pulverized fuel consumer is provided. The restrictor device effects a compensation and also attenuation of pressure fluctuations such as occur in the pulverized fuel conveyor line, in particular during operations to replenish the metering vessel. Special embodiments relate to a further equalization by means of injections of auxiliary gas into the pulverized fuel conveyor line.

1 . An apparatus for constant feeding of pulverized fuels at ambient or elevated pressure to a pulverized fuel consumer with compensation and also attenuation of pressure fluctuations in the pulverized fuel conveyor line, comprising:
 a metering vessel wherein a dense fluidized bed provided in the lower part of the metering vessel in the pulverized fuel filling by feeding fluidizing gas via a control valve by way of a turbulence plate;   a pulverized fuel conveyor line wherein one end of the pulverized fuel conveyor line is immersed into the fluidized bed and its other end is connected to a pulverized fuel consumer; and   a fixed restrictor device arranged in the pulverized fuel conveyor line,   wherein a pressure differential serving to drive the pulverized fuel is given between the metering vessel and the pulverized fuel consumer,   wherein a measurement of a pulverized fuel flow is arranged in the pulverized fuel conveyor line, and   wherein the measurement of the pulverized fuel flow operatively interacts with the control valve in such a way that the volume of fluidizing gas is fed in accordance with the measured pulverized fuel flow.   
     
     
         2 . The apparatus as claimed in  claim 1 , wherein the pulverized fuel flow conveyor line is immersed horizontally into the fluidized bed. 
     
     
         3 . The apparatus as claimed in  claim 1 , wherein the pulverized fuel flow conveyor line is immersed vertically into the fluidized bed. 
     
     
         4 . The apparatus as claimed in  claim 1 , wherein the fixed restrictor device is arranged in the pulverized fuel conveyor line between the metering vessel and the measurement of the pulverized fuel flow. 
     
     
         5 . The apparatus as claimed in  claim 1 , wherein an auxiliary gas feed is provided in the metering vessel at a conveyor pipe inlet. 
     
     
         6 . The apparatus as claimed in  claim 1 , wherein an auxiliary gas feed into the pulverized fuel conveyor line is provided between the metering vessel and the measurement of the pulverized fuel flow. 
     
     
         7 . The apparatus as claimed in  claim 1 , wherein an auxiliary gas feed into the pulverized fuel conveyor line is provided between the metering vessel and the fixed restrictor device. 
     
     
         8 . The apparatus as claimed in  claim 1 , wherein an auxiliary gas feed into the fixed restrictor device is provided. 
     
     
         9 . The apparatus as claimed in  claim 1 , wherein an auxiliary gas feed into the pulverized fuel conveyor line is provided between the fixed restrictor device and the pulverized fuel consumer. 
     
     
         10 . The apparatus as claimed in  claim 1 , wherein a restrictable pulverized fuel control valve is arranged in the pulverized fuel conveyor line and is controlled in accordance with the measurement of the pulverized fuel flow. 
     
     
         11 . The apparatus as claimed in  claim 10 , wherein an auxiliary gas feed into the pulverized fuel control valve is provided. 
     
     
         12 . The apparatus as claimed in  claim 5 , wherein the measurement of the pulverized fuel flow operatively interacts with the control valve for the auxiliary gas feed for metering the auxiliary gas volume. 
     
     
         13 . The apparatus as claimed in  claim 1 , wherein a plurality of pulverized fuel conveyor lines are arranged between the metering vessel and the pulverized fuel consumer. 
     
     
         14 . The apparatus as claimed in  claim 1 , wherein the pulverized fuel is fed to the metering vessel from an operating bunker via at least one pressure lock. 
     
     
         15 . The apparatus as claimed in  claim 1 , wherein the apparatus is embodied by means of a pulverized coal injection system of a gasification device operating at above ambient pressure. 
     
     
         16 . The apparatus as claimed in  claim 1 , wherein the fixed restrictor device is provided by means of a venturi tube. 
     
     
         17 . The apparatus as claimed in  claim 1 , wherein the fixed restrictor device is provided by means of a diaphragm. 
     
     
         18 . The apparatus as claimed in  claim 1 , wherein the fixed restrictor device is provided by means of a tube reducer. 
     
     
         19 . The apparatus as claimed in  claim 1 , wherein the fixed restrictor device is provided by means of a non-control valve.