System and method for heat recovery and steam generation in combined cycle systems
AssigneeGeneral Electric Company
InventorsBarrett David Gardiner, Tailai Hu
Life of this patent
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Abstract
A system includes a heat recovery steam generator (HRSG) including a first pressure economizer, a first pressure evaporator that may receive a first portion of a feed water from the first pressure economizer at a first pressure, a re-heat section that may receive the first portion of the feed water from the first pressure economizer as a first steam flow, and a flash system including a first flash vessel that may receive a second portion of the feed water from the first pressure economizer and to generate a first flash steam flow. The system may combine the first flash steam flow with the first steam flow of the feed water at a second pressure less than the first pressure.
Claims20
A system, comprising:
- a heat recovery steam generator (HRSG), comprising:
- a first pressure economizer;
- a first pressure evaporator configured to receive a first portion of a feed water from the first pressure economizer at a first pressure;
- a re-heat section configured to receive the first portion of the feed water from the first pressure economizer as a first steam flow;
- and
- a flash system comprising:
- a first flash vessel configured to receive a second portion of the feed water from the first pressure economizer and to generate a first flash steam flow, wherein the system is configured to combine the first flash steam flow with the first steam flow of the feed water at a second pressure less than the first pressure.
A system, comprising:
- a heat recovery steam generator (HRSG) comprising a high-pressure economizer and a high-pressure evaporator, wherein the high-pressure economizer is configured to provide a first fluid flow to the high-pressure evaporator, a second fluid flow to a gasifier during a first operation mode, and a third fluid flow to a flash system during a second operation mode, and
- a sensor coupled to the high-pressure evaporator, wherein the sensor is configured to determine a fluid level of the high-pressure evaporator;
- a controller configured to control a ratio between the first fluid flow and the third fluid flow during the second operation mode based at least in part on the determined fluid level of the high-pressure evaporator, wherein the first fluid flow is configured to drive a high-pressure stage and an intermediate-pressure stage of a steam turbine, and at least a portion of the third fluid flow is configured to combine with the first fluid flow to drive the intermediate-pressure stage of the steam turbine.
A method, comprising:
- supplying a first-pressure section of a heat recovery steam generator (HRSG) with a feed water, wherein the first-pressure section comprises a first economizer fluidly coupled to a first evaporator, the first economizer is configured to heat the feed water to form a heated feed water, and the first economizer is configured to direct a first portion of the heated feed water to the first evaporator;
- determining a fluid level of the heated feed water within the first evaporator;
- directing a second portion of the heated feed water to a flash system fluidly coupled to a steam turbine, wherein the flash system comprises a first flash vessel, and a ratio between the first portion and the second portion of the heated feed water is based at least in part on the determined fluid level within the first evaporator generating a first flash steam flow in the first flash vessel from the second portion of the heated second feed water;
- and
- directing the first flash steam flow to the steam turbine.
Dependencies are inferred from the claim text.