US3823875A — Burner nozzle tip for pulverized coal and method …

Claim 1

Independent Claim 160 words

A tangential burner nozzle tip for a pulverized solid fuel combustion furnace comprising a. a stainless steel, hollow, open ended cast outer shell having at least one integrally cast, weld-free elongated rib extending internally from each side thereof from one open end toward the other open end thereof, and b. a replaceable stainless steel, weld-free, hollow, open-ended cast inner shell positioned within said outer shell and adapted to conduct and project pulverized solid fuel and air therethrough from one open end thereof to and out its other end, said inner shell having at least one integrally cast, weld-free elongated rib-extending externally from each side thereof for each rib of said outer shell, said ribs of said inner shell engaging said ribs of said outer shell whereby said shells are inter-engaged so as to form a unitary concentric body for projecting pulverized solid fuel and air through said inner shell and air through the space between said inner and outer shells.

Claim 2

Dependent Claim 160 words

A tangential burner nozzle tip for a pulverized solid fuel combustion furnace comprising a. a stainless steel, hollow, open ended cast outer shell having at least one integrally cast, weld-free elongated rib extending internally from each side thereof from one open end toward the other open end thereof, and b. a replaceable stainless steel, weld-free, hollow, open-ended cast inner shell positioned within said outer shell and adapted to conduct and project pulverized solid fuel and air therethrough from one open end thereof to and out its other end, said inner shell having at least one integrally cast, weld-free elongated rib-extending externally from each side thereof for each rib of said outer shell, said ribs of said inner shell engaging said ribs of said outer shell whereby said shells are inter-engaged so as to form a unitary concentric body for projecting pulverized solid fuel and air through said inner shell and air through the space between said inner and outer shells.

Claim 3

Dependent Claim 38 words

The nozzle tip defined in claim 1 wherein the sides of the inner and outer shells are substantially isosceles trapezoidal in shape with the edges of said sides thereof defining the open ends of said shells being parallel.

Claim 4

Dependent Claim 62 words

The nozzle tip defined in claim 2 wherein one of said open ends is defined by the shorter parallel edges of said sides of said shells and constitutes the outlet end of each shell and said nozzle tip and said other parallel edges of said sides defining the other open end constituting the inlet end of each shell and said nozzle tip.

Claim 5

Dependent Claim 55 words

The nozzle tip of claim 1 wherein at least one side of each of said shells has a marginal portion adjacent one end thereof defining a pair of apertures adapted for receiving nozzle tip supporting and tilting members, said marginal portions of said inner and outer shells defining at least an aligned pair of apertures.

Claim 6

Dependent Claim 44 words

The nozzle tip of claim 1 wherein said outer shell has a substantially greater resistance to heat than said inner shell and said inner shell has a substantially greater resistance to erosion from a moving solid fuel in air suspension than said outer shell.

Claim 7

Independent Claim 210 words

A method for the production of a heat and erosion resistant tangential burner nozzle tip for a pulverized solid fuel combustion furnace comprising a. casting a one-piece, weld-free stainless steel hollow open-ended inner shell having at least one transverse baffle plate integrally, interiorly cast therein, and having at least one outwardly projecting integrally cast, weld-free elongated rib positioned exteriorly on each side of said shell and extending from one open end of said shell toward the other open end, said cast inner shell being adapted to conduct and project pulverized solid fuel and air therethrough, b. casting a one-piece, weld-free stainless steel hollow, open-ended outer shell having at least one inwardly projecting integrally cast, weld-free elongated rib positioned interiorly on each side of said shell and extending from one open end of said shell toward the other open end, each of said ribs being adapted to engage one of said ribs of said inner shell upon said inner shell being positioned within said outer shell, said cast outer shell being adapted to conduct and project air therethrough, and c. positioning said inner shell within said outer shell with each rib of the former engaging a rib of the latter whereby a unitary weld-free, concentric shelled burner nozzle tip is formed.

Claim 8

Independent Claim 210 words

A method for the production of a heat and erosion resistant tangential burner nozzle tip for a pulverized solid fuel combustion furnace comprising a. casting a one-piece, weld-free stainless steel hollow open-ended inner shell having at least one transverse baffle plate integrally, interiorly cast therein, and having at least one outwardly projecting integrally cast, weld-free elongated rib positioned exteriorly on each side of said shell and extending from one open end of said shell toward the other open end, said cast inner shell being adapted to conduct and project pulverized solid fuel and air therethrough, b. casting a one-piece, weld-free stainless steel hollow, open-ended outer shell having at least one inwardly projecting integrally cast, weld-free elongated rib positioned interiorly on each side of said shell and extending from one open end of said shell toward the other open end, each of said ribs being adapted to engage one of said ribs of said inner shell upon said inner shell being positioned within said outer shell, said cast outer shell being adapted to conduct and project air therethrough, and c. positioning said inner shell within said outer shell with each rib of the former engaging a rib of the latter whereby a unitary weld-free, concentric shelled burner nozzle tip is formed.

Claim 9

Dependent Claim 42 words

The method defined in claim 6 wherein said casting steps include providing at least one cored pair of apertures aligned in superposed sides of said inner and outer shells adjacent one end thereof adapted to receive nozzle tip supporting and tilting members.

Claim 10

Dependent Claim 30 words

The method defined in claim 7 wherein said step of casting said inner shell includes integrally casting an enlarged boss adjacent one of said pair of apertures in said side.

Claim 11

Dependent Claim 49 words

The method defined in claim 7 wherein said step of casting said outer shell includes casting said side thereof with a portion of reduced thickness about one of said pair of apertures, said portion of reduced thickness extending from about said aperture to said adjacent end of said shell.

Claim 12

Dependent Claim 82 words

The method defined in claim 6 wherein said step of casting said outer shell includes casting said shell of stainless steel which has a substantially greater resistance to heat than the stainless steel of which said inner shell is cast, and said step of casting said inner shell includes casting said shell of stainless steel which has a substantially greater resistance to erosion from a moving solid fuel in air suspension than the stainless steel of which said outer shell is cast.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-07-15	1978-01-14	1978-07-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-07-15	1982-01-14	1982-07-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-07-15	1986-01-14	1986-07-16	$7700.00	Window Closed / Lapsed

Burner nozzle tip for pulverized coal and method for its production

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