Systems and methods for prewarming heat recovery steam generator piping
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01K-007/34
F01K-009/00
출원번호
US-0713213
(2010-02-26)
등록번호
US-8776521
(2014-07-15)
발명자
/ 주소
Tong, Leslie Yung-Min
Rancruel, Diego
Vedavyasachar, SriHarsha
출원인 / 주소
General Electric Company
대리인 / 주소
Sutherland Asbill & Brennan LLP
인용정보
피인용 횟수 :
2인용 특허 :
6
초록▼
The present application describes a heat recovery steam generator. The heat recovery steam generator may include a superheater, a first turbine section, a first main steam line in communication with the superheater and the first turbine section, and a first prewarming line positioned downstream of t
The present application describes a heat recovery steam generator. The heat recovery steam generator may include a superheater, a first turbine section, a first main steam line in communication with the superheater and the first turbine section, and a first prewarming line positioned downstream of the first main steam line such that a flow of steam from the superheater preheats the first main steam line without entry into the first turbine section.
대표청구항▼
1. A heat recovery steam generator system, comprising: a superheater;a first turbine section;a first main steam line in communication with the superheater and the first turbine section;a first bypass line positioned upstream of the first main steam line;a reheater positioned downstream of the first
1. A heat recovery steam generator system, comprising: a superheater;a first turbine section;a first main steam line in communication with the superheater and the first turbine section;a first bypass line positioned upstream of the first main steam line;a reheater positioned downstream of the first turbine section; anda first prewarming line positioned downstream of the first main steam line and configured such that a flow of steam from the superheater preheats the first main steam line without entry into the first turbine section and is directed to the reheater so as to produce a reheated flow of steam, wherein the heat recovery steam generator system is configured to reuse the reheated flow of steam therein. 2. The heat recovery steam generator of claim 1, wherein the first turbine section comprises a high pressure section and wherein the first main steam line comprises a high pressure section main steam line. 3. The heat recovery steam generator of claim 1, wherein the first prewarming line extends to the first bypass line. 4. The heat recovery steam generator of claim 1, wherein the first bypass line extends to a cold reheat line, and wherein the first prewarming line extends to the first bypass line upstream of the cold reheat line. 5. The heat recovery steam generator of claim 1, further comprising a first bypass line valve positioned on the first bypass line. 6. The heat recovery steam generator of claim 1, further comprising an isolation valve positioned upstream of the first main steam line, and a control valve positioned downstream of the first main steam line. 7. The heat recovery steam generator of claim 1, further comprising a second main steam line, and a second turbine section positioned downstream of the first turbine section, wherein the second main steam line is in communication with the reheater and the second turbine section. 8. The heat recovery steam generator of claim 7, further comprising a second bypass line positioned upstream of the second main steam line, a condenser positioned downstream of the second turbine section, and a second prewarming line positioned downstream of the second main steam line and configured such that the reheated flow of steam from the reheater preheats the second main steam line without entry into the second turbine section and is directed to the condenser. 9. The heat recovery steam generator of claim 8, wherein the second turbine section comprises an intermediate pressure section and wherein the second main steam line comprises an intermediate pressure section main steam line. 10. The heat recovery steam generator of claim 8, wherein the second prewarming line extends to the second bypass line. 11. A method of starting up a heat recovery steam generator, comprising: generating a flow of steam in a superheater;directing the flow of steam through a first main steam line;diverting the flow of steam through a first prewarming line and to a first bypass line until the flow of steam reaches a predetermined temperature; anddirecting the flow of steam to a first turbine section once the predetermined temperature is reached. 12. The method of claim 11, further comprising: reheating the flow of steam in a reheater so as to produce a reheated flow of steam;directing the reheated flow of steam through a second main steam line;diverting the reheated flow of steam through a second prewarming line and to a second bypass line until the reheated flow of steam reaches the predetermined temperature; anddirecting the reheated flow of steam to a second turbine section once the predetermined temperature is reached. 13. The method of claim 12, further comprising directing the reheated flow of steam to a condenser. 14. The method of claim 11, wherein the step of diverting the flow of steam through a first prewarming line comprises opening a first main steam line isolation valve and a first prewarming line valve and closing a first main steam line control valve. 15. The method of claim 12, wherein the step of diverting the reheated flow of steam through a second prewarming line comprises opening a reheat isolation valve and a second prewarming line valve and closing a second main steam line control valve. 16. A heat recovery steam generator system, comprising: a superheater;a first turbine section;a first main steam line in communication with the superheater and the first turbine section;a first bypass line positioned upstream of the first main steam line;a reheater positioned downstream of the first turbine section;a first prewarming line positioned downstream of the first main steam line and configured such that a flow of steam from the superheater preheats the first main steam line without entry into the first turbine section and is directed to the reheater so as to produce a reheated flow of steam;a second turbine section;a second main steam line in communication with the reheater and the second turbine section;a second bypass line positioned upstream of the second main steam line;a condenser positioned downstream of the second turbine section; anda second prewarming line positioned downstream of the second main steam line and configured such that the reheated flow of steam from the reheater preheats the second main steam line without entry into the second turbine section and is directed to the condenser. 17. The heat recovery steam generator of claim 16, wherein the first turbine section comprises a high pressure section, the first main steam line comprises a high pressure section main steam line, the second turbine section comprises an intermediate pressure section, and the second main steam line comprises an intermediate pressure section main steam line. 18. The heat recovery steam generator of claim 16, wherein the first bypass line extends to a cold reheat line, and wherein the first prewarming line extends to the first bypass line upstream of the cold reheat line. 19. The heat recovery steam generator of claim 16, further comprising a first bypass line valve positioned on the first bypass line. 20. The heat recovery steam generator of claim 16, further comprising an isolation valve positioned upstream of the first main steam line, and a control valve positioned downstream of the first main steam line.
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이 특허에 인용된 특허 (6)
Dimitroff ; Jr. Vladimir T. (Sanbornville NH) Wagner James B. (Peabody MA), Apparatus and method for controlling steam turbine operating conditions during starting and loading.
Braytenbah Andrew S. (Pennsauken NJ) Jaegtnes Karl O. (Chester PA), Dual turbine power plant and a reheat steam bypass flow control system for use therein.
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