Method in connection with a pipe grate for fluidized bed boiler and a pipe grate
AssigneeKvaerner Power Oy
InventorJouni Kinni
Life of this patent
Estimating the term…
Abstract
A method for adjusting a supply of gaseous medium to a fluidized bed boiler performing a combustion process and including a pipe grate comprising a plurality of pipes. An active area of the pipe grate is adjusted to form at least one inactive bed area that is out of use by shutting off the supply of gaseous medium to some of the pipes of the pipe grate utilizing pipe-specific control means included in at least some of the pipes of the pipe grate. Cooling medium is conducted through cooling channels located in the pipes in the at least one inactive bed area at least during the combustion process.
Claims12
A method for adjusting a supply of gaseous medium to a fluidized bed boiler performing a combustion process and including a pipe grate comprising a plurality of pipes, the method comprising:
- adjusting an active area of the pipe grate to form at least one inactive bed area that is out of use by shutting off the supply of gaseous medium to some of the pipes of the pipe grate utilizing pipe-specific control means included in at least some of the pipes of the pipe grate;
- and
- conducting cooling medium through cooling channels located in the pipes in the at least one inactive bed area at least during the combustion process.
A pipe grate for a fluidized bed boiler, the pipe grate comprising:
- a plurality of pipes;
- a duct connected to the pipes and operable to supply a gaseous medium to the pipe grate;
- nozzles operable to supply the gaseous medium to a furnace above the pipe grate;
- pipe-specific control means acting on at least some of the pipes in the pipe grate and being openable and closable to, respectively, open and close the connection from the duct to the pipes and operable by a closing action to shut off the supply of gaseous medium to at least some of the pipes to adjust an active area of the pipe grate and form at least one inactive bed area that is out of use wherein the control means are arranged in at least one outermost pipe at both edges of the pipe grate, wherein a number of pipes equipped with the openable and closable pipe-specific control means at edges of the pipe grate of parallel pipes is less than half of a total number of pipes of the pipe grate;
- and
- channels operable to conduct a cooling medium to at least some of the pipes to cool the at least one inactive bed area.
Dependencies are inferred from the claim text.