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

Patent metadata

Field	Value
Publication number	US-9939152-B2
Application number	US-201314037712-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Oct 1, 2012
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A system for fluidizing and conveying a powdery product is provided. The system includes plurality of powder-locking and metering vessels, the vessels each having a conveying line for the powdery product and a control mechanism for the mass flow of the powdery product. The conveying lines are brought together to form a common conveying line and are supplied to a remover of the powdery product. The powder-locking and metering vessels are alternatively fed with the powdery product and tensioned with the fluidizing gas under operating pressure. The control mechanisms of the powder-locking and metering vessels are activated in such a manner that the mass flow sum of powdery product in the conveying lines is identical to the desired value for the mass flow of powdery product to the remover of the powdery product.

First claim

The invention claimed is:

1. 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.

2. The system as claimed in claim 1 , wherein the mass flow of powdery fuel output by a powder-locking and metering vessel is controllable in accordance with the setting of the respective control valve, which is associated with said combined powder-locking and metering vessel, in the associated conveying line.

3. The system as claimed in claim 1 , wherein the mass flow of powdery fuel output by a powder-locking and metering vessel is controllable in accordance with the amount of fluidizing gas set in a fluidizing gas line via the respective control valve associated with said combined powder-locking and metering vessel.

4. The system as claimed in claim 1 , wherein the powdery fuel of the common powder-conveying line is dividable by a powder flow divider into a plurality of divided-up conveying lines connecting the divider with the entrained-flow gasifying reactor.

5. The system as claimed in claim 4 , wherein that said system is dimensioned in such a manner that the ratio of the cross section of the divided-up conveying lines to the conveying line is 1.5 to 3 times.

6. The system as claimed in claim 1 , wherein the diameter of the powder-conveying line is increased over the conveying length, wherein the flow speed is reducible by up to half by expansion of the powder-conveying line.

7. The system as claimed in claim 1 , wherein said system is dimensioned in such a manner that the pressure loss in the powder-conveying lines is at maximum 20% of the pressure in the metering vessel.

8. The system as claimed in claim 1 , wherein the pulverized fuel is supplied to the powder-locking and metering vessels from the device for drying and grinding.

9. The system as claimed in claim 1 , wherein the fluidizing gas is provided by an inert gas.

10. The system as claimed in claim 1 , wherein the entrained-flow gasifying reactor converts the pulverized fuel into crude gas.

11. The system as claimed in claim 1 , further comprising an auxiliary gas line connected to a powder conveying line.

12. The system as claimed in claim 1 , wherein the system is configured for overcoming conveying distances of 80 to 500 m, under an operating pressure of up to 10 MPa.

Assignees

• Hannemann Frank
• Schingnitz Manfred
• Siemens Ag

Inventors

• Hannemann Frank
• Schingnitz Manfred

Classifications

• C10J2300/0909

  Drying · CPC title

• F23K2201/20

  Drying · CPC title

• F23K2203/105

  Flow splitting devices to feed a plurality of burners · CPC title

• C10B31/00

  Charging devices · CPC title

• F23K2201/101

  to a specific particle size · CPC title