Film temperature optimizer for fired process heaters

Patent metadata

Field	Value
Publication number	US-10551053-B2
Application number	US-201715796729-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Jun 30, 2015
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A fired heater with a film temperature optimizer is presented. The fired heater is for heating a process fluid in process coils within the fired heater. The process coils experience high temperatures at the outlets. The film temperature optimizer includes baffles or means for changing the flow of the fired heating gas around the process coils near the coil outlets. The baffles are positioned near the process coil outlets.

First claim

The invention claimed is:

1. An apparatus for a process fired heater comprising:
a shell having sides, an upper surface, a lower surface, combustion fluid inlets and a flue gas outlet;
at least one process coil comprising two inlet ports and one outlet port, and disposed within the shell and having the inlet ports and outlet port disposed on the upper surface of the shell;
at least two burners disposed on the sides of the shell; and
a projection disposed within the shell and positioned on the upper surface of the shell and between the burners and wherein the process coil outlet port is disposed on the projection, wherein the projection extends between 2% and 15% of a height from the upper surface of the shell.

2. The apparatus of claim 1 wherein the process coil has a configuration of three tubes in a parallel orientation, with two semi-circular tubular sections connecting the ends of the tubes, such that the tubes and tubular sections form a W-shaped coil, and the two inlet tubes having one end connected to an inlet port and the central outlet tube having one end connected to the outlet port.

3. The apparatus of claim 1 , wherein the upper surface further includes a refractory material on the upper surface, inside the shell and abutting the projection.

4. The apparatus of claim 2 wherein the shell has a substantially rectangular prismatic shape, with a height, a depth and a width, and wherein the process coils extend at least 70% of the height, and the process coils are arranged across the width with the central tubes arrayed along an axis that is in the middle of the width of the shell, and wherein the outer tubes are arrayed in a position between 5% and 95% of the distance of the half-width of the shell.

5. The apparatus of claim 1 further comprising an insulating layer on top of the upper surface.

6. The apparatus of claim 1 wherein the shell has a substantially rectangular prismatic shape, with a height, a depth and a width, and wherein the burners are disposed on opposite sides of the width of the shell, and wherein the burners are disposed within 10% of the height of the from the bottom of the shell.

7. The apparatus of claim 1 wherein the shell has a substantially rectangular prismatic shape, with a height, a depth and a width, and wherein the burners are disposed on opposite sides of the depth of the shell.

8. The apparatus of claim 1 wherein the projection has a width of between 10 and 50% of the width of the shell.

9. An apparatus for a process fired heater comprising:
a shell having sides having a height, an upper surface, and a lower surface which defines a volume, and combustion fluid inlets and a flue gas outlet;
at least one process coil comprising two inlet ports and one outlet port, and disposed within the shell and having the inlet ports and outlet port disposed on the upper surface of the shell; and
at least two burners disposed on the sides of the shell in a position below the flue gas outlet;
wherein the upper surfaces comprises a surface with a projection into the volume wherein the projection extends at least 2% of the height, and wherein the process coil outlet port is disposed on the projection, wherein the projection extends between 3% and 15% of the height into the volume.

10. The apparatus of claim 9 wherein the projection has a width and a depth, wherein the depth is the projection length into the volume, and width is at least 10% of the distance between the sides of the shell with the burners.

11. The apparatus of claim 9 wherein the shell has a shell width and the projection has a projection width that is between 10% and 50% of the shell width.

12. The apparatus of claim 9 wherein the process coil has a configuration of three tubes in a parallel orientation, with two semi-circular tubular sections connecting the ends of the tubes, such that the tubes and tubular sections form a W-shaped coil, and the two inlet tubes having one end connected to an inlet port on the upper surface between the projection and the sides, and the central outlet tube having one end connected to the outlet port disposed on the projection.

Assignees

• Uop Llc

Inventors

• Yuan Quan
• Gattupalli Rajeswar
• Martin Matthew
• Vetter Michael J

Classifications

• F23C5/28

  to obtain flames in opposing directions, e.g. impacting flames · CPC title

• F23C3/00 Primary

  Combustion apparatus characterised by the shape of the combustion chamber · CPC title

• F22B35/10 Primary

  of once-through type · CPC title