Abstract

A system for deriving 100% quality steam for steam assisted gravity drainage (SAGD) injection or other applications features a once through steam generator (OTSG), a steam-water separator connected downstream of the OTSG's radiant tubes to separate steam and water from a two-phase flow received therefrom, superheater tubes installed in the convection section and connected to a steam outlet of the steam-water separator in downstream relation thereto to receive and heat dried steam therefrom to a superheated state, and a desuperheater connected downstream of the superheater tubes to receive the superheated steam therefrom and use same to vaporize blowdown water from the steam-water separator, whereby the vaporized blowdown water and the superheated steam collectively form a superheated steam output for the intended application, typically after additional separation of solid particles therefrom for optimal steam quality.

IPC Classes  ?

• F22B 29/06 - Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
• F22B 37/48 - Devices or arrangements for removing water, minerals or sludge from boilers
• F22G 1/02 - Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
• F22B 37/26 - Steam-separating arrangements
• F22G 5/12 - Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
• F22B 1/22 - Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
• F22B 37/32 - Steam-separating arrangements using centrifugal force

Abstract

ABSTRACT
A system for deriving 100% quality steam for steam assisted gravity drainage
(SAGD)
injection or other applications features a once through steam generator
(OTSG), a
steam-water separator connected downstream of the OTSG's radiant tubes to
separate steam and water from a two-phase flow received therefrom, superheater

tubes installed in the convection section and connected to a steam outlet of
the
steam-water separator in downstream relation thereto to receive and heat dried
steam
therefrom to a superheated state, and a desuperheater connected downstream of
the
superheater tubes to receive the superheated steam therefrom and use same to
vaporize blowdown water from the steam-water separator, whereby the vaporized
blowdown water and the superheated steam collectively form a superheated steam

output for the intended application, typically after additional separation of
solid
particles therefrom for optimal steam quality.
Date Recue/Date Received 2020-10-06

IPC Classes  ?

• E21B 43/24 - Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
• F22G 3/00 - Steam superheaters characterised by constructional featuresDetails or component parts thereof
• F22G 7/00 - Steam superheaters characterised by location, arrangement, or disposition