US 12,546,236 B2 · Parallel heat recovery in gas power generation

Abstract

A modified combined-cycle gas power system includes a mixed fuel preheat coil, a heat recovery steam generator (HRSG), and a parallel connection coupling a gas turbine to the mixed fuel preheat coil and the HRSG for receiving gas turbine exhaust (GTE). In some cases, the system further includes a GTE flow controller coupled to the parallel connection to control a ratio of the GTE received by the mixed fuel preheat coil and the HRSG. In some cases, the parallel connection from the gas turbine to the mixed fuel preheat coil and the HRSG is a single exhaust duct having an internal separator baffle. In some cases, the parallel connection from the gas turbine to the mixed fuel preheat coil and the HRSG is dual exhaust ducts. In some cases, the mixed fuel preheat coil does not include a burner or catalyst for generating reformed fuel.

Claims20

Dependent claims

A modified combined-cycle gas power system comprising:

a mixed fuel preheat coil;
a heat recovery steam generator (HRSG);
a parallel connection for receiving gas turbine exhaust (GTE) from a downstream end of a gas turbine, the parallel connection coupling the gas turbine to the mixed fuel preheat coil and the HRSG and simultaneously sending a portion of the GTE to the mixed fuel preheat coil and a remaining portion of the GTE to the HRSG, wherein the portion of the GTE sent to the mixed fuel preheat coil is sent directly to a stack upon exiting the mixed fuel preheat coil;
and
an external pre-reformer coupled to the downstream end of the mixed fuel preheat coil.

2 more elements

A method of using a modified combined-cycle gas power system, including a mixed fuel preheat coil, a heat recovery steam generator (HRSG), a parallel connection coupling a gas turbine to the mixed fuel preheat coil and the HRSG, and an external pre-reformer coupled to a downstream end of the mixed fuel preheat coil, the method comprising:

simultaneously receiving, directly from the gas turbine via the parallel connection, a portion of gas turbine exhaust (GTE) at the mixed fuel preheat coil and a remaining portion of the GTE at the HRSG;
raising a temperature of fuel and steam using the GTE in the mixed fuel preheat coil to create a hot mixed fuel;
sending the portion of the GTE received at the mixed fuel preheat coil directly to a stack upon exiting the mixed fuel preheat coil;
feeding the hot mixed fuel from the mixed fuel preheat coil to the external pre-reformer;
and
producing reformed fuel in the external pre-reformer for use in the gas turbine as fuel.

3 more elements

Dependencies are inferred from the claim text.

Parallel heat recovery in gas power generation

Life of this patent

Parallel heat recovery in gas power generation

Life of this patent

Abstract

Claims20