[특허]Method and system for operative reconversion of pairs of pre-existing steam turbo-units

Ansaldo Energia S.p.A.

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특허 상세정보

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Method and system for operative reconversion of pairs of pre-existing steam turbo-units

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01K-007/22 F01K-007/00
미국특허분류(USC)	060/653; 060/679
출원번호	UP-0495782 (2006-07-31)
등록번호	US-7562531 (2009-07-29)
우선권정보	EP-05425563(2005-07-29)
발명자 / 주소	Falavigna, Loris Torre, Alberto
출원인 / 주소	Ansaldo Energia S.p.A.
대리인 / 주소	Sughrue Mion, PLLC
인용정보	피인용 횟수 : 0 인용 특허 : 3

초록
▼

Method and system, in which a pair of pre-existing steam turbo-units, a first one of which is formed by a first steam turbine and a first electric generator connected on a first common shaft and a second one of which is formed by a second steam turbine and by a second electric generator connected on a second common shaft, are coupled to one another in a system configuration of a cross-compound type; in which high-pressure and medium-pressure sections of the first turbine are replaced with a single high-pressure section made in such a way as to maintain the pre-existing foundations, and in which high-pressure and medium-pressure sections of the second turbine are replaced with a single medium-pressure section made in such a way as to maintain the pre-existing foundations. A single supercritical boiler supplies in cascaded fashion one and the same flow of steam to the new high-pressure and medium-pressure sections set on the first shaft and on the second shaft, respectively. A single piping downstream of the new medium-pressure section collects the flow of steam and supplies it in parallel, via a branch thereof intercepted by a regulation valve, to the pre-existing low-pressure sections of both of the shafts.

대표
청구항
▼

The invention claimed is: 1. A method for obtaining operative reconversion of a pair of pre-existing steam turbo-units, in which at least one pair of said steam turbo-units, a first of which comprising a first steam turbine (2) and a first electric generator (6) connected on a first common shaft (4) and a second of which comprising a second steam turbine (3) and a second electric generator (7) connected on a second common shaft (5), are coupled to one another in a configuration of a cross-compound type; said method being characterized in that it comprises at least: a step of decommissioning and removal of the high-pressure and medium-pressure sections of both of said steam turbines; a step of replacement of the removed sections with a new high-pressure section (10) on the first shaft and a new medium-pressure section (14) on the second shaft, said new high-pressure and medium-pressure sections being made in such a way as to occupy at least part of the space left free, on each shaft, by both the high-pressure section and the medium-pressure section removed from that shaft, leaving the pre-existing foundations unaltered; and a step of setting in hydraulic connection in cascaded fashion the new high-pressure section on the first shaft and the new medium-pressure section on the second shaft to a single supercritical boiler (22), in such a way that the latter will be able to supply one and the same flow of steam, in series, to the new high-pressure section and, then, to the new medium-pressure section. 2. The method according to claim 1, characterized in that it further comprises a step of setting in hydraulic connection in parallel only the new medium-pressure section with respective pre-existing low-pressure sections (12, 16) of both said first turbine and said second turbine, set respectively on the first shaft and on the second shaft, by means of a single pipe (18) set downstream of the new medium-pressure section to collect substantially all the flow of steam (V) that traverses the latter and supply it in parallel, directly, to the pre-existing low-pressure section (16) of the second shaft and, via a branch (20) intercepted by a regulation valve (21), to the pre-existing low-pressure section of the first shaft. 3. The method according to claim 1, characterized in that it comprises a step of removal of respective subcritical boilers, of actuation of said first and second turbines, and of installation of a single said supercritical boiler for actuation of both of the turbines. 4. The method according to claim 3, characterized in that said single supercritical boiler is provided with at least one superheater (23) and at least one re-superheater (24), cascaded to one another; the former being hydraulically connected in series to said new high-pressure section of the first shaft upstream thereof and the latter being hydraulically connected in series to said new medium-pressure section of the second shaft, immediately upstream thereof and immediately downstream of the new high-pressure section. 5. The method according to claim 2, characterized in that said regulation valve (21) is set on the branch as close as possible to the pipe that connects the branch and the pre-existing low-pressure section of the second shaft to the new medium-pressure section of the second shaft. 6. The method according to claim 5, characterized in that said regulation valve is an on-off valve. 7. The method according to claim 5, characterized in that said regulation valve is a proportional valve controlled by an electronic control and protection unit (45) for both said first shaft and said second shaft. 8. A system (1) for the production of energy by means of at least one pair of steam turbines (2, 3) operating in cross-compound configuration, in which a first steam turbine (2) is coupled on a first shaft (4) to a first electric generator (6), and a second steam turbine (3) is coupled on a second shaft (5) to a second electric generator (7); and in which the first steam turbine includes just a high-pressure section and a first low-pressure section, whilst the second steam turbine includes just a medium-pressure section and a second low-pressure section; wherein said high-pressure section is connected exclusively to the medium-pressure section, upstream thereof, whilst the medium-pressure section is connected in parallel to said first and second low-pressure sections, immediately upstream thereof, by means of a pipe (18) of a relatively short length that connects the medium-pressure section (14) of the second steam turbine to the second low-pressure section, which is located on the same shaft, and, by means of a branch (20) of said pipe, of a relatively long length, that connects said medium-pressure section (14) with the first low-pressure section, which is located on the shaft of said high-pressure section; wherein said system further comprises a regulation valve (21) that intercepts in series said branch, said regulation valve being placed along said branch as near as possible to said pipe; and in that said low-pressure sections discharge the exhaust steam towards a different condenser respectively. 9. The system according to claim 8, characterized in that it further comprises a single supercritical boiler (22), which supplies in cascaded fashion, said high-pressure section and, then, said medium-pressure section.

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특허 상세정보

Method and system for operative reconversion of pairs of pre-existing steam turbo-units

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Method and system for operative reconversion of pairs of pre-existing steam turbo-units

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이 특허에 인용된 특허 (3)

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