Natural circulation multi-circulation package boiler with superheat for steam assisted gravity drainage (SAGD) process including superheat

Patent metadata

Field	Value
Publication number	US-11415314-B2
Application number	US-201916445721-A
Country	US
Kind code	B2
Filing date	Jun 19, 2019
Priority date	Jun 19, 2019
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A boiler includes an upper steam drum, an optional intermediate drum, and a lower drum. Each drum is divided by an internal divider into a clean section and a concentrated section. Downcomers connect the upper steam drum to the lower drum, and tubes are connected to convey a heated steam-water mixture from the lower drum into the upper steam drum (through the optional intermediate drum, if provided). An optional superheater has an input terminal connected to receive steam from the clean section of the upper steam drum. An attemperator may be provided to attemperate superheated steam output from an output terminal of the superheater, and the attemperation fluid may optionally be provided from the concentrated side of the upper steam drum.

First claim

The invention claimed is:

1. A boiler comprising:
an upper steam drum having an internal divider which divides the upper steam drum into a clean section and a concentrated section;
a lower drum having an internal divider which divides the lower drum into a clean section and a concentrated section;
clean downcomers connecting the clean section of the upper steam drum to the clean section of the lower drum;
concentrated downcomers connecting the concentrated section of the upper steam drum to the concentrated section of the lower drum;
steam-water tubes connected to convey a steam-water mixture from the lower drum into the upper steam drum;
a superheater having an input terminal connected to receive steam from the clean section of the upper steam drum and an output terminal connected to a delivery steam pipe that delivers superheated steam flow output from the superheater to an injection well of a Steam Assisted Gravity Drainage (SAGD) process or to a turbine; and
a temperature control device comprising an attemperator connected with the output terminal of the superheater and an actuated valve, the attemperator configured to inject attemperation fluid into the superheated steam flow output from the output terminal of the superheater and the actuated valve controlling a flow rate of the attemperation fluid into the superheated steam flow to provide temperature control.

2. The boiler of claim 1 wherein:
the attemperator is configured to inject the attemperation fluid comprising steam into the superheated steam flow output from the output terminal of the superheater.

3. The boiler of claim 1 wherein:
the attemperator is connected with the concentrated section of the upper steam drum to receive the attemperation fluid comprising concentrated steam from the concentrated section of the upper steam drum.

4. The boiler of claim 1 wherein the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section, and the superheater being disposed in the boiler section.

5. The boiler of claim 1 wherein:
the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section; and
the steam-water tubes are arranged into a plurality of banks of steam-water tubes in the boiler section with the banks spaced apart along the heated gas flow path, and the superheater is disposed in the boiler section and replaces at least the inner tubes of a bank of steam-water tubes in the boiler section.

6. The boiler of claim 1 wherein the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section, and the superheater is disposed in the furnace section.

7. The boiler of claim 1 wherein the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section, and the boiler further comprises:
a superheater module housing containing the superheater, the superheater module housing connected with an outlet of the heated gas flow path, the superheater module housing defining a sealed conduit continuing the heated gas flow path past the outlet.

8. The boiler of claim 7 wherein the sealed conduit defined by the superheater module housing connects the outlet with an economizer.

9. The boiler of claim 1 wherein the superheater does not have an input terminal connected with the lower drum.

10. The boiler of claim 9 further comprising:
an intermediate drum;
wherein the steam-water tubes connect the lower drum with the intermediate drum and the intermediate drum is connected with the upper steam drum by risers whereby the steam-water tubes are connected to convey a steam-water mixture from the lower drum into the upper steam drum via the intermediate drum;
wherein the superheater does not have an input terminal connected with the intermediate drum.

11. A boiler comprising:
an upper steam drum that includes an internal divider which divides the upper steam drum into a clean section and a concentrated section;
a lower drum;
downcomers connecting the upper steam drum to the lower drum;
steam-water tubes connecting the lower drum with one of:
(i) an intermediate drum connected with the upper steam drum by risers; or
(ii) the upper steam drum wherein the boiler does not include an intermediate drum connected with the upper steam drum by risers;

a superheater having an input terminal connected to receive steam from the clean section of the upper steam drum and an output terminal connected to a delivery steam pipe that delivers superheated steam flow output from the superheater to an injection well of a Steam Assisted Gravity Drainage (SAGD) process or to a turbine; and
a temperature control device comprising an attemperator connected with the output terminal of the superheater and an actuated valve, the attemperator further connected with the concentrated steam section of the upper steam drum to inject concentrated steam from the concentrated steam section of the upper steam drum into the superheated steam flow output from the output terminal of the superheater, and the actuated valve controlling a flow rate of the concentrated steam from the concentrated steam section of the upper steam drum into the superheated steam flow to provide temperature control.

12. The boiler of claim 11 wherein the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section, and the superheater is disposed in the boiler section.

13. The boiler of claim 11 wherein:
the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section;
the steam-water tubes are arranged into a plurality of banks of tubes in the boiler section with the banks spaced apart along the heated gas flow path; and
the superheater is disposed in the boiler section and replaces at least the inner tubes of a bank in the boiler section.

14. The boiler of claim 11 wherein the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section, and the superheater is disposed in the furnace section.

15. The boiler of claim 11 wherein the boiler includes a furnace section and a boiler section defining a heated gas flow path along which heated gas passes through the furnace section and then through the boiler section, the steam-water tubes being disposed in the boiler section, and the boiler further comprises:
a superheater module housing containing the superheater, the superheater module housing connected with an outlet of the heated gas flow path, the superheater module housing defining a sealed conduit continuing the heated gas flow path past the outlet.

Assignees

• Babcock & Wilcox Co

Inventors

• Albrecht Melvin J
• Marshall Jason M
• Remus Jeremy L

Classifications

• F22G7/14

  in water-tube boilers, e.g. between banks of water tubes · CPC title

• F22B37/18

  Inserts, e.g. for receiving deposits from water · CPC title

• F22B21/12

  involving two or more upper drums and two or more lower drums, e.g. with crosswise-arranged water-tube sets in abutting connection with drums · CPC title

• F22B21/34

  built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers · CPC title

• F22B37/486

  Devices for removing water, minerals or sludge from boilers (F22B37/483, F22B37/50, F22B37/52 and F22B37/54 take precedence) · CPC title