In-Furnace Gas Injection Port

Abstract

Tertiary nozzle of port for gas injection into furnace includes a contracted flow producing channel provided obliquely toward central axis from the upstream side of gas flow so that the gas flow has a velocity component heading from the outer circumferential side of the port toward the central axis and a velocity component heading along the central axis toward the interior of the furnace, and including louver disposed for guiding so that the gas flows along the surface of throat wall of enlarged pipe configuration wherein the gas channel is enlarged at a furnace wall opening disposed at an outlet area of the contracted flow producing channel. Accordingly, there can be provided a gas injection port that not depending on conditions, such as the flow rate of gas injected from the port, without inviting any complication of apparatus structuring or cost increase, enables preventing of the growth in lump form of clinker caused by ash adhesion and fusion on the wall surface of throat enlarged pipe portion of the furnace.

1 . An in-furnace gas injection port which is disposed on a furnace wall of the furnace, comprising:
 a contracted flow producing channel having a velocity component flowing toward the central axis of gas flow perpendicular to the furnace wall and a velocity component flowing along the central axis, and provided obliquely toward the central axis from the upstream side of gas flow;   a throat enlarged pipe portion in which a gas channel formed on a furnace wall opening on the downstream side of the contracted flow producing channel is gradually enlarged in a direction of the gas flow; and   a louver disposed on the contracted flow producing channel for guiding so that gas flowing through the contracted flow producing channel can flow along the wall surface of the throat enlarged pipe portion and whose leading end portion on the upstream side of gas flow is located on a surface obtained by extending the outer circumferential wall surface of the contracted flow producing channel toward the central axis or on the upstream side of gas flow from the thus extended surface and which has at the downstream part of gas flow an enlarged pipe portion gradually enlarged in a direction of gas flow so as to run along the wall surface of the throat enlarged pipe portion.   
   
   
       2 . (canceled) 
   
   
       3 . The in-furnace gas injection port as set forth in  claim 1 , comprising a mechanism for changing a ratio of the velocity component of air flow flowing through the contracted flow producing channel along the central axis and the velocity component of air flow flowing toward the central axis. 
   
   
       4 . The in-furnace gas injection port as set forth in  claim 3 , comprising a damper starting to open from the near surface side to the furnace so that gas flows along the outer circumferential wall surface of the contracted flow producing channel and capable of adjusting an aperture of the contracted flow producing channel. 
   
   
       5 . The in-furnace gas injection port as set forth in  claim 1 , comprising a rotating member for rotating gas between the louver and the wall surface of the throat enlarged pipe portion. 
   
   
       6 . The in-furnace gas injection port as set forth in  claim 1 , wherein a length of the enlarged pipe portion in a gas flow direction formed at the downstream end portion of the louver is ½ or lower than a length of the wall surface of the throat enlarged pipe portion in a gas flow direction. 
   
   
       7 . The in-furnace gas injection port as set forth in  claim 1 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       8 . The in-furnace gas injection port as set forth in  claim 3 , comprising a rotating member for rotating gas between the louver and the wall surface of the throat enlarged pipe portion. 
   
   
       9 . The in-furnace gas injection port as set forth in  claim 4 , comprising a rotating member for rotating gas between the louver and the wall surface of the throat enlarged pipe portion. 
   
   
       10 . The in-furnace gas injection port as set forth in  claim 3 , wherein a length of the enlarged pipe portion in a gas flow direction formed at the downstream end portion of the louver is ½ or lower than a length of the wall surface of the throat enlarged pipe portion in a gas flow direction. 
   
   
       11 . The in-furnace gas injection port as set forth in  claim 4 , wherein a length of the enlarged pipe portion in a gas flow direction formed at the downstream end portion of the louver is ½ or lower than a length of the wall surface of the throat enlarged pipe portion in a gas flow direction. 
   
   
       12 . The in-furnace gas injection port as set forth in  claim 5 , wherein a length of the enlarged pipe portion in a gas flow direction formed at the downstream end portion of the louver is ½ or lower than a length of the wall surface of the throat enlarged pipe portion in a gas flow direction. 
   
   
       13 . The in-furnace gas injection port as set forth in  claim 8 , wherein a length of the enlarged pipe portion in a gas flow direction formed at the downstream end portion of the louver is ½ or lower than a length of the wall surface of the throat enlarged pipe portion in a gas flow direction. 
   
   
       14 . The in-furnace gas injection port as set forth in  claim 9 , wherein a length of the enlarged pipe portion in a gas flow direction formed at the downstream end portion of the louver is ½ or lower than a length of the wall surface of the throat enlarged pipe portion in a gas flow direction. 
   
   
       15 . The in-furnace gas injection port as set forth in  claim 3 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       16 . The in-furnace gas injection port as set forth in  claim 4 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       17 . The in-furnace gas injection port as set forth in  claim 5 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       18 . The in-furnace gas injection port as set forth in  claim 8 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       19 . The in-furnace gas injection port as set forth in  claim 9 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       20 . The in-furnace gas injection port as set forth in  claim 6 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       21 . The in-furnace gas injection port as set forth in  claim 10 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       22 . The in-furnace gas injection port as set forth in  claim 11 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       23 . The in-furnace gas injection port as set forth in  claim 12 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       24 . The in-furnace gas injection port as set forth in  claim 13 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis. 
   
   
       25 . The in-furnace gas injection port as set forth in  claim 14 , wherein the contracted flow producing channel is given as a tertiary nozzle and a primary nozzle is disposed inside from the tertiary nozzle and a secondary nozzle is disposed outside the primary nozzle through which each gas flows along the central axis.