Method for startup and management of a combined cycle heating system for the production of power

Patent metadata

Field	Value
Publication number	US-10240487-B2
Application number	US-201113976917-A
Country	US
Kind code	B2
Filing date	Dec 30, 2011
Priority date	Dec 30, 2010
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A method to start up and manage a combined cycle thermal plant for energy production comprising the execution according to a set sequence of a plurality of functional groups.

First claim

What is claimed is:

1. A method to start up and manage a combined cycle thermal plant for energy production comprising a first gas turbine and generator group (TG 1 ), a first steam generator (GRV 1 ), a multistage steam turbine (TV) and a separate generator coupled to said steam turbine (TV) wherein:
said first steam generator (GRV 1 ) is a recovery steam generator to utilize the latent heat of the exhaust gases of said first gas turbine and generator group (TG 1 );
said first steam generator (GRV 1 ) is in fluid communication through steam lines at high, medium and low pressure with corresponding stages at high, medium and low pressure of said steam turbine (TV) and
said separate generator is kinematically coupled to said steam turbine to be rotationally operated; and
said method comprising monitoring and detecting a plurality of parameters that determine correct functioning and/or malfunctioning of said first gas turbine and generator group (TG 1 ), of said first steam generator (GRV 1 ) and of said steam turbine (TV), and wherein the method further comprises starting up the plant from an off-state which starting up comprises, in order, the following sequential operations:
Operation GF 1 A: preparing said first gas turbine and generator group (TG 1 ) for start up;
Operation GF 2 A: starting said first gas turbine and generator group (TG 1 ) and pressurizing said first steam generator (GRV 1 );
Operation GF 3 A: warming up and increasing the load of said steam turbine (TV) following starting said first gas turbine and generator group (TG 1 );
wherein said method further comprises:
verifying completion of said operation GF 1 A and, subordinate to the completion of said operation GF 1 A automatically implementing operation GF 2 A and
verifying completion of said operation GF 2 A and, subordinate to completion of operation GF 2 A automatically implementing operation GF 3 A
so that the starting up is automatically carried out.

2. The method of claim 1 , wherein said combined cycle thermal plant for energy production further comprises:
a second gas turbine and generator group (TG 2 ),
a second recovery steam generator (GRV 2 ) to utilize the latent heat of the exhaust gases of said second gas turbine and generator group (TG 2 );
said second steam generator (GRV 2 ) being in fluid communication through a high pressure steam collector (CAP), through a medium pressure steam collector (CMP) and through a low pressure steam collector (CBP) with said high, medium and low pressure steam lines of said first steam generator (GRV 1 ) to feed said high, medium and low pressure stages of said steam turbine (TV) through a steam parallelism at high, medium and low pressure between said first steam generator (GRV 1 ) and said second steam generator (GRV 2 ),
and wherein said method comprises detecting and monitoring a plurality of parameters that determine correct functioning and/or malfunctioning of said second gas turbine and generator group (TG 2 ) and of said second steam generator (GRV 2 ), wherein the method further comprises starting up said second gas turbine and generator group (TG 2 ) which starting up comprises, in order, the following sequential operations:
Operation GF 4 A: preparing said second gas turbine and generator group (TG 2 ) for start up;
Operation GF 5 A: starting said second gas turbine and generator group (TG 2 ) and pressurizing said second steam generator (GRV 2 ) and
Operation GF 6 A: inserting a steam parallelism between said second steam generator (GRV 2 ) and said first steam generator (GRV 1 ) through said steam collectors at high (CAP), medium (CMP) and low (CBP) pressure respectively feeding said high, medium and low pressure stages of said steam turbine (TV),
wherein said method further comprises:
verifying achievement of correct execution of said operation GF 1 A and, subordinate to said achievement effecting automatic implementation of said operation GF 4 A;
verifying achievement of operation GF 3 A and, subordinate to the achievement said operation GF 3 A automatically effecting operation GF 5 A and
checking the completion of said operation GF 5 A and, subordinate to the completion of operation GF 5 A automatically effecting operation GF 6 A,
so that the starting up of said second gas turbine and generator group (TG 2 ) is automatically carried out.

3. The method of claim 2 , which further includes a stop phase of said second gas turbine and generator group (TG 2 ) and of said second steam generator (GRV 2 ) that comprises, in order, the following sequential operations:
Operation GF 4 B: interrupting the steam parallelism between said second steam generator (GRV 2 ) and said first generator (GRV 1 ) and
Operation GF 3 B: stopping said second gas turbine and generator group (TG 2 )
wherein said method comprises:
verifying completion of said operation GF 4 B and, subordinate to the completion of operation GF 4 B automatically carrying out operation GF 3 B,
so that the stop phase of said second gas turbine and generator group (TG 2 ) is automatically carried out.

4. The method of claim 3 , wherein said operation GF 3 B comprises a simultaneous bottling of said second steam generator (GRV 2 ) to keep steam pressure and temperature as long as possible inside.

5. The method of claim 1 , 3 or 4 which further includes a stop phase of said first gas turbine and generator group (TG 1 ) and first steam generator (GRV 1 ) that comprises, in order, the following sequential operations:
Operation GF 2 B: reducing the load of said first gas turbine and generator group (TG 1 ) and blocking said steam turbine (TV) and
Operation GF 1 B: stopping said first gas turbine and generator group (TG 1 )
wherein the method comprises:
verifying completion of said operation GF 2 B and, subordinate to the completion of operation GF 2 B automatically effecting operation GF 1 B,
so that the stop phase of said first gas turbine and generator group (TG 1 ) is automatically carried out.

6. The method of claim 5 , wherein said operation GF 1 B comprises a simultaneous bottling of said first steam generator (GRV 1 ) to keep steam pressure and temperature as long as possible inside.

7. A combined cycle thermal plant to produce energy comprising:
a) a first gas turbine and generator group (TG 1 ),
b) a first recovery steam generator (GRV 1 ) to utilize the latent heat of the exhaust gases of said first gas turbine and generator group (TG 1 ),
c) a steam turbine (TV) with high, medium and low stage pressure in fluid communication with said first steam generator (GRV 1 ) through high, medium and low pressure steam lines;
d) a separate generator kinematically coupled to said steam turbine (TV) to be rotationally operated;
e) a detection and control device to monitor and detect a plurality of parameters that determine correct functioning and/or malfunctioning of said plant, wherein said plant further comprises a control and processing unit that memorizes:
i) each single operation in sequence of sequential operations necessary to obtain the start/stop of each of the components a) to d) of the plant said start/stop defined as starting from off and/or partial or total on conditions and
ii) for each of said operations in sequence of sequential operations, plant conditions to be detected by said detection and control device and associated with the execution of each operation in said sequence of sequential operations,
wherein said control and processing unit is connected to said detection and control device which control and processing unit functions so as to
acquire and process information concerning the functioning and/or malfunctioning status of said plant;
further to a request for a specific start/stop sequence among the memorized start/stop

Assignees

• Pasqualon Ezio
• Stamicarbon

Inventors

• Pasqualon Ezio

Classifications

• Y02E20/16

  Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] · CPC title

• F01K23/10

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title

• F22B1/1815

  using the exhaust gases of gas-turbines · CPC title

• F01K23/16

  all the engines being turbines (F01K23/14 takes precedence) · CPC title

• F01K23/101 Primary

  Regulating means specially adapted therefor (F01K23/105, F01K23/108 take precedence) · CPC title