Method and apparatus for combustion of gaseous or liquid fuel

Patent metadata

Field	Value
Publication number	US-11428404-B2
Application number	US-201716619995-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Jun 13, 2017
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A method and apparatus for combustion of fuel in a combustion chamber with a hydraulic diameter D. Fuel and a primary oxidant are introduced via a burner lance into the combustion chamber, having a certain mean velocity u1 at entry, and a secondary oxidant with a mean velocity of u2 is introduced into the combustion chamber. The burner lance has a position p that has a distance Id1I defined as the smallest distance between p and a combustion chamber centerline.

First claim

The invention claimed is:

1. A method for combustion of gaseous or liquid fuel in a combustion chamber with a hydraulic diameter D, whereby the fuel as well as the primary oxidant are introduced via a burner lance into the combustion chamber, whereby fuel and primary oxidant have a certain mean velocity u 1 at the entry from the burner lance into the combustion chamber, whereby the mean velocity u 1 is defined as

u
1

=

∑

i
=
1

n

⁢

⁢

v
i
2

·

ρ
i

·

A
i

m
.

ges

,

whereby v i is the velocity of each separate fluid in the burner lance, ρ i is the density of each separate fluid in the burner lance, A i is the cross-section for the flow of each separate fluid in the burner lance at the entry of the burner lance into the combustion chamber and {dot over (m)} ges is the overall mass flow in the burner lance and whereby a secondary oxidant with a mean velocity of u 2 is introduced via a downcomer into the combustion chamber, wherein the burner lance is arranged such that a distance |d 1 | defined as the smallest distance between a tip p of the burner lance and a combustion chamber centerline a is smaller than a distance |d c | from an intersection point of the combustion chamber centerline a and a shortest line connecting the tip p of the burner lance and the combustion chamber centerline a to the intersection point i of the downcomer centerline c and an intersection area S of combustion chamber and downcomer, whereby the value of |d 1 | is such that



d
1



=

[

1
-

(

d
·

u
1

u
2

)

1
4

]

·

D
2

and that d is in the range of 0.05 to 0.15, wherein the mean velocity u 1 is from 70 m/s to 140 m/s and the mean velocity u 2 is from 10 m/s to 35 m/s.

2. The method according to claim 1 , wherein the d is in the range of 0.09 to 0.11.

3. The method according to claim 1 , wherein the primary and/or the secondary oxidant is air.

4. The method according to claim 1 , wherein the total air ratio λ with

λ
=

m
.

air

m
.

stoich

is in the range of 1.2 and 12.0.

5. The method according to claim 1 , wherein the primary air ratio λ prim with

λ
prim

=

m
.

air
⁢

-

⁢
prim

m
.

stoich

is in the range of 0.05 and 2.0.

6. The method according to claim 1 , wherein the burner lance has a fuel capacity in the range of 2 and 6 MW.

7. A burner assembly comprising a combustion chamber with a centerline a, a hydraulic diameter D, a burner lance to introduce fuel and primary into the combustion chamber, whereby the mean velocity u 1 is defined as

u
1

=

∑

i
=
1

n

⁢

⁢

v
i
2

·

ρ
i

·

A
i

m
.

ges

,

whereby v i is the velocity of each separate fluid in the burner lance, ρ i is the density of each separate fluid in the burner lance, A i is the cross-section for the flow of each separate fluid in the burner lance at the entry of the burner lance into the combustion chamber and {dot over (m)} ges is the overall mass flow in the burner lance, whereby the burner assembly adapted such that fuel and primary oxidant have a certain mean velocity u 1 at the entry from the burner lance into the combustion chamber, measured from a tip p of the burner lance and a downcomer adapted to introduce a secondary oxidan

Assignees

• Outotec Finland Oy

Inventors

• Maduta Robert
• Ströder Michael
• Munko Andreas

Classifications

• F23D99/004 Primary

  for use in particular heating operations · CPC title

• F23C2900/06041

  Staged supply of oxidant · CPC title

• F23D14/24 Primary

  at least one of the fluids being submitted to a swirling motion · CPC title

• F23D14/22 Primary

  with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other · CPC title

• F23C2900/03005

  Burners with an internal combustion chamber, e.g. for obtaining an increased heat release, a high speed jet flame or being used for starting the combustion · CPC title