Method and arrangement for feeding process gases from a suspension smelting furnace into a waste heat boiler

1. A method for feeding process gases from an uptake of a suspension smelting furnace into a waste heat boiler, said uptake comprising an uptake inner roof, said uptake inner roof being non-vertical, wherein the method comprises

a first providing step for providing a feeding throat having a feeding channel comprising a channel inner roof, said channel inner roof being non-vertical,

a connecting step for connecting the feeding throat to an uptake inner space of the uptake of the suspension smelting furnace at an exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat and for connecting the feeding throat to the waste heat boiler at an entrance between the feeding throat and a boiler inner space of the waste heat boiler,

a feeding step for feeding process gases from the uptake of the suspension smelting furnace into the waste heat boiler through the feeding channel of the feeding throat, and

a second providing step for providing at least one of the uptake inner roof of the uptake of the suspension smelting furnace and the channel inner roof of the feeding channel of the feeding throat with an angled and/or curved section that slopes at least partly downwardly in an angled and/or curved manner in the direction towards the entrance between the feeding throat and the boiler inner space of the waste heat boiler,

wherein the connecting step includes connecting the feeding throat to the uptake inner space of the uptake of the suspension smelting furnace at the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat so that the channel inner roof of the feeding channel of the feeding throat adjoins the uptake inner roof of the uptake of the suspension smelting furnace.

2. The method according to claim 1 , wherein

the second providing step includes providing the uptake inner roof of the uptake of the suspension smelting furnace with an angled and/or curved section that slopes at least partly downwardly in an angled and/or curved manner in the direction towards the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat.

3. The method according to claim 1 , wherein

the second providing step and the connecting step include arranging the feeding throat between the uptake inner space of the uptake of the suspension smelting furnace and the boiler inner space of the waste heat boiler so that the channel inner roof of the feeding throat at least partly between the exit and the entrance slopes downwardly in an angled and/or curved manner in the direction towards the boiler inner space of the waste heat boiler to provide said angled and/or curved section.

4. The method according to claim 1 , wherein

the first providing step for providing a feeding throat comprises providing a feeding throat having a feeding channel limited by the channel inner roof, an inner bottom and two opposite inner side walls between the channel inner roof and the inner bottom.

5. The method according to claim 1 , wherein

the connecting step includes connecting the feeding throat between the uptake inner space of the uptake of the suspension smelting furnace and the boiler inner space of the waste heat boiler so that the highest point of the uptake inner roof of the uptake of the suspension smelting furnace is located at a level above the highest point of the channel inner roof of the feeding throat.

6. The method according to claim 1 , wherein

the connecting step and the second providing step include arranging the feeding throat between the uptake inner space of the uptake of the suspension smelting furnace and the boiler inner space of the waste heat boiler so that the channel inner roof of the feeding throat slopes downwardly in an angled and/or curved manner in the direction towards the boiler inner space of the waste heat boiler between the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat and the entrance between the feeding throat and the boiler inner space of the waste heat boiler to provide said angled and/or curved section.

7. The method according to claim 1 , wherein

the connecting step includes connecting the feeding throat between the uptake inner space of the uptake of the suspension smelting furnace and the boiler inner space of the waste heat boiler so that the boiler inner roof of the boiler inner space of the waste heat boiler is at the entrance between the feeding throat and the boiler inner space of the waste heat boiler located at a level above the channel inner roof of the feeding throat at the entrance between the feeding throat and the boiler inner space of the waste heat boiler.

8. The method according to claim 1 , wherein

the connecting step includes connecting the feeding throat to the boiler inner space of the uptake of the suspension smelting furnace at the exit so that the highest point of the uptake inner roof of the uptake of the suspension smelting furnace is located at a level of 1 to 2 m above the level of the channel inner roof of the feeding throat at the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat.

9. The method according to claim 1 , wherein

the connecting step and the second providing step include arranging the feeding throat between the uptake inner space of the uptake of the suspension smelting furnace and the boiler inner space of the waste heat boiler so that the channel inner roof of the feeding throat at least partly between the exit and the entrance slopes downwardly with a sloping angle that is between 30 and 60 degrees, such as 45 degrees.

10. An arrangement for feeding process gases from an uptake of a suspension smelting furnace into a waste heat boiler, said uptake comprising an uptake inner roof, said uptake inner roof being non-vertical, wherein the arrangement comprises

a feeding throat for feeding process gas from an uptake inner space of the uptake of the suspension smelting furnace into the boiler inner space of the waste heat boiler,

wherein the feeding throat is connected to the uptake inner space of the uptake of the suspension smelting furnace at an exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat,

wherein the feeding throat is connected to the waste heat boiler at an entrance between the feeding throat and a boiler inner space of the waste heat boiler,

wherein the feeding throat has a feeding channel comprising a channel inner roof, said channel inner roof being non-vertical,

wherein at least one of the uptake inner roof of the uptake of the suspension smelting furnace and the channel inner roof of the feeding channel of the feeding throat being provided with an angled and/or curved section that slopes at least partly downwardly in an angled and/or curved manner in the direction towards the entrance between the feeding throat and the boiler inner space of the waste heat boiler, and

wherein the feeding throat is connected to the uptake inner space of the uptake of the suspension smelting furnace at the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat so that the channel inner roof of the feeding channel of the feeding throat adjoins the uptake inner roof of the uptake of the suspension smelting furnace.

11. The arrangement according to claim 10 , wherein

the uptake inner roof of the uptake of the suspension smelting furnace is provided with an angled and/or curved section that slopes at least partly downwardly in an angled and/or curved manner in the direction towards the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat.

12. The arrangement according to claim 10 , wherein

the channel inner roof of the feeding throat is provided with an angled and/or curved section that slopes at least partly downwardly in an angled and/or curved manner in the direction towards the entrance between the feeding throat and the boiler inner space of the waste heat boiler.

13. The arrangement according to 10 , wherein

the feeding throat having a feeding channel is limited by the channel inner roof, an inner bottom and two opposite inner side walls between the channel inner roof and the inner bottom.

14. The arrangement according to claim 10 , wherein

the highest point of the uptake inner roof of the uptake of the suspension smelting furnace is located at a level above the highest point of the channel inner roof of the feeding throat.

15. The arrangement according to claim 10 , wherein

the channel inner roof of the feeding throat between the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat and the entrance between the feeding throat and the boiler inner space of the waste heat boiler is provided with an angled and/or curved section that slopes downwardly in an angled and/or curved manner in the direction towards the entrance between the feeding throat and the boiler inner space of the waste heat boiler.

16. The arrangement according to claim 10 , wherein

the boiler inner roof of the boiler inner space of the waste heat boiler is at the entrance between the feeding throat and the boiler inner space of the waste heat boiler located at a level above the channel inner roof of the feeding throat at the entrance between the feeding throat and the boiler inner space of the waste heat boiler.

17. The arrangement according to claim 10 , wherein

the highest point of the uptake inner roof of the uptake of the suspension smelting furnace is located at a level of 1 to 2 m above the level of the channel inner roof of the feeding throat at the exit between the uptake inner space of the uptake of the suspension smelting furnace and the feeding throat.

18. The arrangement according to claim 10 , wherein

the channel inner roof of the feeding throat at least partly between the exit and the entrance slopes downwardly with a sloping angle that is between 30 and 60 degrees.

19. The arrangement according to claim 10 , wherein

the channel inner roof of the feeding throat at least partly between the exit and the entrance slopes downwardly with a sloping angle that is 45 degrees.