Control methods and valve arrangement for start-up and shutdown of pressurized combustion and gasification systems integrated with a gas turbine
AssigneePyropower Corporation
InventorsSteve J. Provol, David B. Russell, Matti J. Isaksson
Life of this patent
Estimating the term…
Abstract
A power plant having a system for converting coal to power in a gas turbine comprises a coal fed pressurized circulating bed for converting coal to pressurized gases, a gas turbine having a compressor for pressurizing air for the pressurized circulating bed and expander for receiving and expanding hot combustion gases for powering a generator, a first fast acting valve for controlling the pressurized air, a second fast acting valve means for controlling pressurized gas from the compressor to the expander.
Claims15
A power plant having a system for converting coat to power in a gas turbine, comprising:
- coal fed pressurized means for converting coal to pressurized gases for powering a gas turbine;
- a gas turbine having a compressor for pressurizing combustion air for said pressurized means and expander means for receiving and expanding hot combustion gases for powering a generator for generating electrical power;
- control means including first fast acting valve means for controlling flow of pressurized air from said compressor to said pressurized means, and second fast acting valve means for controlling flow of pressurized air from said compressor to said expander means for rapidly diverting flow of pressurized combustion air around said pressurized means to said expander means for emergency shutdown of said turbine during emergency conditions,
- first tight shutoff valve means for isolating flow between said pressurized means and said expander;
- and
- second tight shutoff valve means for venting gases from said pressurized means, wherein said first fast acting valve means is a butterfly valve.
A power plant for converting coal to power in a gas turbine, comprising:
- coal fed pressurized means for converting coal to pressurized gases for powering a gas turbine;
- a gas turbine having a compressor for pressurizing combustion air for said pressurized means and expander means for receiving and expanding hot combustion gases for powering a generator for generating electrical power;
- a first conduit means for supplying pressurized air to said pressurized means;
- first fast acting valve means in said first conduit means for controlling pressurized air therein;
- second conduit means for supplying pressurized air to said expander means;
- second fast acting valve means in said second conduit means for controlling pressurized air therein;
- third conduit means for supplying pressurized gases to said expander means;
- a first tight shutoff valve in said third conduit means for isolating pressurized gases to said expander during start-up and in preparation for restarting;
- and
- a second tight shutoff valve in said third conduit means for venting gases from said pressurized means.
A method of operating a power plant having a system for converting coal to power in a gas turbine, comprising:
- providing coal fed pressurized combustor means for converting coal to pressurized gases for powering a gas turbine;
- providing a gas turbine having a compressor for pressurizing combustion air for said pressurized combustor means and expander means for receiving and expanding hot combustion gases for powering a generator for generating electrical power;
- providing first fast acting valve means for controlling flow of pressurized air from said compressor to said pressurized combustor means;
- providing second fast acting valve means for controlling flow of pressurized air from said compressor to said expander means;
- providing first tight shutoff valve means for isolating back flow of pressurized gases to said combustor during start-up and/or to said expander in preparation for hot restart;
- providing a second tight shutoff valve means for venting gases from said pressurized combustor means;
- and
- providing emergency shut-down control means for operating said first fast acting valve and said second fast acting valve between full open and full closed positions within a period of from 0.2 to 2.0 seconds.
Dependencies are inferred from the claim text.