초록

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.

대표청구항 ▼

1. A method to start up and manage a combined cycle thermal plant for energy production comprising a first gas turbine and generator group (TG1), a first steam generator (GRV1), a multistage steam turbine (TV) and a separate generator coupled to said steam turbine (TV) wherein: said first steam gene

1. A method to start up and manage a combined cycle thermal plant for energy production comprising a first gas turbine and generator group (TG1), a first steam generator (GRV1), a multistage steam turbine (TV) and a separate generator coupled to said steam turbine (TV) wherein: said first steam generator (GRV1) is a recovery steam generator to utilize the latent heat of the exhaust gases of said first gas turbine and generator group (TG1);said first steam generator (GRV1) 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) andsaid separate generator is kinematically coupled to said steam turbine to be rotationally operated; andsaid method comprising monitoring and detecting a plurality of parameters that determine correct functioning and/or malfunctioning of said first gas turbine and generator group (TG1), of said first steam generator (GRV1) 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 GF1A: preparing said first gas turbine and generator group (TG1) for start up;Operation GF2A: starting said first gas turbine and generator group (TG1) and pressurizing said first steam generator (GRV1);Operation GF3A: warming up and increasing the load of said steam turbine (TV) following starting said first gas turbine and generator group (TG1);wherein said method further comprises: verifying completion of said operation GF1A and, subordinate to the completion of said operation GF1A automatically implementing operation GF2A andverifying completion of said operation GF2A and, subordinate to completion of operation GF2A automatically implementing operation GF3Aso 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 (TG2),a second recovery steam generator (GRV2) to utilize the latent heat of the exhaust gases of said second gas turbine and generator group (TG2);said second steam generator (GRV2) 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 (GRV1) 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 (GRV1) and said second steam generator (GRV2),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 (TG2) and of said second steam generator (GRV2), wherein the method further comprises starting up said second gas turbine and generator group (TG2) which starting up comprises, in order, the following sequential operations:Operation GF4A: preparing said second gas turbine and generator group (TG2) for start up;Operation GF5A: starting said second gas turbine and generator group (TG2) and pressurizing said second steam generator (GRV2) andOperation GF6A: inserting a steam parallelism between said second steam generator (GRV2) and said first steam generator (GRV1) 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 GF1A and, subordinate to said achievement effecting automatic implementation of said operation GF4A;verifying achievement of operation GF3A and, subordinate to the achievement said operation GF3A automatically effecting operation GF5A andchecking the completion of said operation GF5A and, subordinate to the completion of operation GF5A automatically effecting operation GF6A,so that the starting up of said second gas turbine and generator group (TG2) is automatically carried out. 3. The method of claim 2, which further includes a stop phase of said second gas turbine and generator group (TG2) and of said second steam generator (GRV2) that comprises, in order, the following sequential operations: Operation GF4B: interrupting the steam parallelism between said second steam generator (GRV2) and said first generator (GRV1) andOperation GF3B: stopping said second gas turbine and generator group (TG2)wherein said method comprises: verifying completion of said operation GF4B and, subordinate to the completion of operation GF4B automatically carrying out operation GF3B,so that the stop phase of said second gas turbine and generator group (TG2) is automatically carried out. 4. The method of claim 3, wherein said operation GF3B comprises a simultaneous bottling of said second steam generator (GRV2) 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 (TG1) and first steam generator (GRV1) that comprises, in order, the following sequential operations: Operation GF2B: reducing the load of said first gas turbine and generator group (TG1) and blocking said steam turbine (TV) andOperation GF1B: stopping said first gas turbine and generator group (TG1)wherein the method comprises: verifying completion of said operation GF2B and, subordinate to the completion of operation GF2B automatically effecting operation GF1B,so that the stop phase of said first gas turbine and generator group (TG1) is automatically carried out. 6. The method of claim 5, wherein said operation GF1B comprises a simultaneous bottling of said first steam generator (GRV1) 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 (TG1),b) a first recovery steam generator (GRV1) to utilize the latent heat of the exhaust gases of said first gas turbine and generator group (TG1),c) a steam turbine (TV) with high, medium and low stage pressure in fluid communication with said first steam generator (GRV1) 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 andii) 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 toacquire 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 sequences, to automatically start in succession the operations of said sequential operations subordinate to detecting by monitoring of all conditions necessary for said sequential operations to be carried out thus allowing start of each operation of the required sequential operations, by verifying correct achievement of the plant conditions as a consequence of the correct execution of an operation previous to starting the following operation within the same sequential operations, andwherein said specific start/stop sequence comprises, in order, the following sequential operations:Operation GF1A: preparing said first gas turbine and generator group (TG1) for start up;Operation GF2A: starting said first gas turbine and generator group (TG1) and pressurizing said first steam generator (GRV1); andOperation GF3A: warming up and increasing the load of said steam turbine (TV) following starting said first gas turbine and generator group (TG1). 8. The plant of claim 7, further comprising a second gas turbine and generator group (TG2) and a second recovery steam generator (GRV2) to utilize the latent heat of the exhaust gases of said second gas turbine and generator group (TG2); wherein: said second steam generator (GRV2) is 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 respectively low pressure steam lines which feed said high, medium and low pressure stages of said steam turbine (TV) to create a steam high, medium and low pressure parallelism between said first steam generator (GRV1) and said second steam generator (GRV2), andsaid plant comprises a further detection and control device to detect and monitor a plurality of parameters that determine the correct functioning and/or malfunctioning of said second gas turbine and generator group (TG2) and of said second steam generator (GRV2) andsaid control and processing unit is connected to said further detection and control device to acquire and process information concerning the functioning and/or malfunctioning status of said second gas turbine and generator group (TG2) and of said second steam generator (GRV2). 9. The plant of claim 8, wherein said first steam generator (GRV1) and said second steam generator (GRV2) are cylindrical body generators with horizontal development, with three different levels of pressure and a degasification device.