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US 9,920,476 B2Granted
Arrangement and method in soda recovery boiler
AssigneeValmet Technologies Oy
InventorsPiia Niemi, Markku Isoniemi, Tero Juutilainen, Kari Haaga
Life of this patent
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Abstract
An arrangement and a method in a soda recovery boiler, in a furnace (1) of which recovery boiler there are arranged screen tubes (7) and which recovery boiler comprises a second pass (9) in which is arranged at least one superheater (4′). The second pass (9) is arranged for being cooled with cooling medium coming from the screen tubes (7).
Claims14
An arrangement in a soda recovery boiler comprising:
- a furnace comprising arranged screen tubes,
- a second pass comprising a second pass ash hopper, the second pass ash hopper comprising at least one of front wall cooling pipes or rear wall cooling pipes, and
- at least one superheater arranged in the second pass,
- wherein:
- the second pass is cooled with cooling medium coming from the screen tubes,
- the front wall cooling pipes and/or the rear wall cooling pipes are connected to receive the cooling medium from the screen tubes, and
- the cooling pipes of the ash hopper form a gastight front and/or rear wall of the ash hopper.
4 more elements
A method in a soda recovery boiler, the method comprising the steps of:
- providing a soda recovery boiler comprising:
- a second pass comprising a second pass ash hopper,
- screen tubes arranged in a furnace, and
- at least one superheater arranged in the second pass, and
- cooling the second pass with cooling medium conveyed from the screen tubes,
- wherein:
- the cooling medium is conveyed to at least one of a front wall or a rear wall of the second pass ash hopper from the screen tubes, and
- the cooling pipes of the ash hopper form a gastight front and/or rear wall of the ash hopper.
5 more elements
Dependencies are inferred from the claim text.