Yulin Shao

US Patent:

56644116, Sep 9, 1997

Filed:

Aug 28, 1996

Appl. No.:

8/704123

Inventors:

Yulin Shao - Stoneham MA

International Classification:

F02C 328

US Classification:

60 3902

Abstract:

A method for generating electric power comprises the S cycle, an air separation unit and a Rankine cycle. Steam, oxygen and coal are introduced into a reaction chamber to form fuel gas. The fuel gas flows through heat exchangers and a compressor-turbine group to three combustors. Three combustors are operated at different pressure levels. The combustion gases of the first combustor go to the first gas turbine. The exhaust of the first gas turbine is employed as working medium for the succeeding combustors and gas turbines. The combustion gases of the second combustor flow to the second gas turbine, and the combustion gases of the third combustor go to the third gas turbine. The exhaust of the third gas turbine is utilized to heat compressed air and to produce steam for coal gasification and Rankine cycle. An integrated air separation unit, including a pressure temperature swing process, produces pure oxygen on site and generates electricity through a turbine compressor group.

US Patent:

55728618, Nov 12, 1996

Filed:

Apr 12, 1995

Appl. No.:

8/420405

Inventors:

Yulin Shao - Stoneham MA

International Classification:

F02C 328

US Classification:

60 3902

Abstract:

The S cycle electric power system embodies a separation condensation unit, a Rankine cycle and the S cycle including coal gasification. Coal, oxygen and steam are converted into high temperature and pressure fuel gas in a coal gasifier. The fuel gas is first utilized to heat recycled carbon dioxide and steam, then to drive a compressor turbine group to produce power. In a main gas turbine group, the fuel gas is burned in the recycled carbon dioxide. Three main turbines are operated at three different pressure levels. The exhaust of the third turbine is employed to heat the recycled carbon dioxide from a 6-stage compressor with intercooling, and to produce steam. Part of the steam goes to coal gasification. The rest of the steam generates power by expansion in a steam turbine. An integrated separation condensation unit produces pure oxygen on site, and captures carbon dioxide formed in fuel combustion.

US Patent:

57248052, Mar 10, 1998

Filed:

Aug 21, 1995

Appl. No.:

8/517542

Inventors:

Dan S. Golomb - Newton MA
Yulin Shao - Stoneham MA
Gilbert J. Brown - Westford MA

Assignee:

University of Massachusetts-Lowell - Lowell MA

International Classification:

F02G 300
F02B 4300

US Classification:

60 3902

Abstract:

The invention relates to a power plant including an air separation unit arranged to separate oxygen from air and produce a stream of substantially pure liquid oxygen; a gas turbine arranged to combust a fuel, e. g. , natural gas, liquefied natural gas, or synthesis gas, in the presence of substantially pure oxygen gas and carbon dioxide gas, and to produce an exhaust gas comprising water and carbon dioxide; and a carbon dioxide removal unit arranged to recover carbon dioxide gas from the exhaust gas, recycle a portion of the recovered carbon dioxide gas for passage through the gas turbine, and liquefy the remainder of the recovered carbon dioxide gas for removal from the plant. In this new plant, the carbon dioxide removal unit is thermally integrated with the air separation unit by directing the stream of liquid oxygen from the air separation unit to the carbon dioxide removal unit to liquefy the remainder of the recovered carbon dioxide gas, the liquid oxygen thereby evaporating and forming cold oxygen gas which is directed to cool the recycled carbon dioxide gas prior to passage of the carbon dioxide gas through the gas turbine, and the oxygen gas is then directed to the gas turbine.