Supply device for a combustion chamber

Abstract

A supply device for supplying solid particles and a carrier fluid to a heat generating plant combustion chamber. The supply device has a first end, a second end, a tube, an opening through the tube at the first end, and a supply pipe. A first end of the pipe is proximal to the first end of the supply device and has an opening defining an outlet of the pipe. A second end of the pipe is distal to the first end of the supply device, has an opening defining an inlet of the pipe, and is connected to an inside surface of the tube. The supply pipe defines a curved flow channel within the tube, and the flow channel at the outlet of the pipe has a direction towards the opening through the tube which is at an angle to the longitudinal axis of the supply device.

1 - 21 . (canceled) 
     
     
         22 . A tubular supply device for supplying solid particles and a carrier fluid to a combustion chamber in a heat generating plant, the supply device having a first end, a second end and a longitudinal axis and comprising:
 an outer tube forming an outer lateral surface of the supply device;   an inner tube positioned inside the outer tube such that an axial space is formed surrounding the inner tube between the inner tube and the outer tube;   coolant connectors at the second end of the supply device and configured as an inlet and an outlet, respectively, for a cooling medium allowed to circulate in the axial space of the supply device between the inner tube and the outer tube;   a connector located at the second end of the supply device configured for connecting a supply-line for supply of the solid particles into the inner tube;   an opening through the outer tube and the inner tube at the first end of the supply device; and   a supply pipe, a first end of the supply pipe being proximal to the first end of the supply device and having an opening defining an outlet of the supply pipe, and a second end of the supply pipe being distal to the first end of the supply device, having an opening defining an inlet of the supply pipe and being connected to an inside surface of the inner tube, the supply pipe defining a curved flow channel within the inner tube wherein the flow channel at the outlet of the supply pipe has a direction towards the opening through the outer tube and the inner tube which is at an angle to the longitudinal axis of the supply device, the supply pipe not extending outside of the outer tube.   
     
     
         23 . The supply device of  claim 22 , wherein the opening is through a lateral surface of the inner tube and the outer tube. 
     
     
         24 . The supply device of  claim 22 , wherein the outlet opening of the supply pipe has a diameter which is less than 80% of a diameter of the inner tube. 
     
     
         25 . The supply device of  claim 22 , wherein the outlet opening of the supply pipe has a diameter which is less than 80% of the diameter of the opening through the inner tube and the outer tube. 
     
     
         26 . The supply device of  claim 22 , wherein the outlet opening of the supply pipe has a diameter which is at least 3 cm. 
     
     
         27 . The supply device of  claim 22 , wherein the second end of the supply pipe is connected to the inside surface of the inner tube by means of a circumferential flange configured for forcing an axial flow in the inner tube, from the second end towards the first end of the supply device, into the supply pipe. 
     
     
         28 . The supply device of  claim 22 , wherein the supply pipe comprises a flexible part, allowing the angle to the longitudinal axis to be adjusted. 
     
     
         29 . The supply device of  claim 22 , wherein the angle of the flow channel at the outlet of the supply pipe in relation to the longitudinal axis is at least 30°. 
     
     
         30 . A supply device assembly for supplying solid particles and a carrier fluid to a combustion chamber in a heat generating plant, the combustion chamber being delimited by at least one wall, the assembly comprising:
 the tubular supply device of  claim 22 , the supply device extending, led by its first end, into the combustion chamber through a through hole in the wall of the combustion chamber;   a displacing device in mesh with the supply device for axial displacement of the tubular device through the hole in the chamber wall; and   a supply line connected to the connector for supply of the solid particles, the supply line providing a flow channel between the inner tube and a supply source of the solid particles.   
     
     
         31 . The assembly of  claim 30 , further comprising a particle analysing device arranged for measuring a particle size of the solid particles in a flow channel between the supply source and the supply pipe outlet. 
     
     
         32 . The assembly of  claim 31 , further comprising a control unit configured for controlling the angle between the direction of the supply pipe outlet and the longitudinal axis depending on the particle size measured by the particle analysing device. 
     
     
         33 . The assembly of  claim 31 , further comprising a carrier fluid compression unit configured to adjust the pressure of the carrier fluid depending on the particle size measured by the particle analysing device. 
     
     
         34 . A method of supplying solid particles and a carrier fluid to a combustion chamber in a heat generating plant, the combustion chamber being delimited by at least one wall, the method comprising:
 providing a tubular supply device extending, led by a first end of the supply device, into the combustion chamber through a through hole in the wall of the combustion chamber;   circulating a cooling medium in an axial space formed between an inner tube and an outer tube forming an outer lateral surface of the supply device;   supplying a flow of solid particles from a supply source into the inner tube at a second end of the supply device;   supplying a flow of a carrier fluid into the inner tube at the second end of the supply device such that the solid particles are carried by the carrier fluid in the inner tube from the second end of the supply device towards the first end of the supply device along a longitudinal axis of the supply device;   allowing the flow of carrier fluid carrying the solid particles to enter a supply pipe defining a curved flow channel inside the inner tube, whereby the flow direction is changed; and   emitting the flow of carrier fluid carrying the solid particles from an end outlet of the supply pipe, through an opening through the outer tube and the inner tube at the first end of the supply device and into the combustion chamber at an angle to the longitudinal axis of the supply device.   
     
     
         35 . The method of  claim 34 , wherein the solid particles are a fuel. 
     
     
         36 . The method of  claim 34 , wherein at least 100 kg/h of solid particles are emitted from the supply pipe. 
     
     
         37 . The method of  claim 34 , wherein a primary fuel is combusted at the bottom of the combustion chamber and the solid particles are a secondary fuel emitted into combustion gases of the combustion chamber from the combustion of the primary fuel. 
     
     
         38 . The method of  claim 37 , wherein the solid particles are emitted in a direction which is at least partly counter current to the combustion gases. 
     
     
         39 . The method of  claim 34 , further comprising:
 measuring a particle size of the solid particles in a flow channel between the supply source and the supply pipe outlet; and   adjusting the angle at which the flow is emitted by changing the curved flow channel of the supply pipe based on the measured particle size.   
     
     
         40 . The method of  claim 34 , further comprising:
 measuring a particle size of the solid particles in a flow channel between the supply source and the supply pipe outlet; and   adjusting the pressure, and thus velocity, of the carrier fluid based on the measured particle size.