초록 ▼

In a method for operating a gas turbine (11) in a combined cycle power plant (40), air is drawn in through the gas turbine (11), compressed, and the compressed air is led to a combustor (18, 19) to burn a syngas that is recovered from coal, whereby a portion of the compressed air is separated into o

In a method for operating a gas turbine (11) in a combined cycle power plant (40), air is drawn in through the gas turbine (11), compressed, and the compressed air is led to a combustor (18, 19) to burn a syngas that is recovered from coal, whereby a portion of the compressed air is separated into oxygen and nitrogen. An improved degree of efficiency is achieved by virtue of the fact that a gas turbine (11) with reheating is used, which includes two combustors (18, 19) and two turbines (16, 17), whereby in the first combustor (18) syngas is burned with the compressed air and the resultant hot gases are expanded in the first turbine (16). In the second combustor, syngas is burned with the gases coming from the first turbine (16) and the resultant hot gases are expanded in the second turbine (17) and the generation of the syngas is undertaken in such a manner that the syngas that is generated can be led directly to the first combustor (18).

대표청구항 ▼

The invention claimed is: 1. A method for operating a gas turbine, the method comprising: drawing in air though and compressing air in the gas turbine; conducting compressed air to a combustor; combusting a syngas that is recovered from coal with said compressed air in said combustor, to produce ho

The invention claimed is: 1. A method for operating a gas turbine, the method comprising: drawing in air though and compressing air in the gas turbine; conducting compressed air to a combustor; combusting a syngas that is recovered from coal with said compressed air in said combustor, to produce hot gases; expanding the hot gases from said combustor in a downstream turbine as said hot gases perform work; separating a portion of said compressed air into oxygen and nitrogen; generating syngas in a coal gasifier using the oxygen from said separating; conducting a portion of said compressed air to and cooling portions of the gas turbine that are exposed to hot air with said compressed air; wherein said gas turbine comprises a reheating gas turbine which comprises two combustors and two turbines; wherein combusting a syngas comprises combusting syngas in the first combustor with the compressed air at pressures within the range of 40-65 bar; wherein expanding the hot gases from said combustor comprises expanding in the first turbine; combusting syngas in the second combustor using gases coming from the first turbine, to generate hot gases; expanding the hot gases from said second combustor in the second turbine; and wherein generating syngas comprises generating syngas suitable to be led directly to the first combustor. 2. A method according to claim 1, wherein separating a portion of said compressed air comprises separating at pressures >40 bar. 3. A method according to claim 1, wherein generating syngas with coal comprises generating syngas at pressures >40 bar. 4. A method according to claim 1, wherein generating syngas comprises gasifying coal to produce gas and filtering said gas at pressures >40 bar. 5. A method according to claim 1, wherein generating syngas comprises gasifying coal to produce gas and CO2, and withdrawing CO2 is at pressures >40 bar. 6. A reheating gas turbine comprising: compressors for the compression of air that has been drawn in; a first turbine and a second turbine; a first combustor and a second combustor, said first combustor in fluid communication with at least one of said compressors and with said first turbine, said second combustor in fluid communication with said first turbine and said second turbine; wherein the first combustor is configured and arranged to combust a fuel with compressed air from said at least one of said compressors at pressures within a range of 40-65 bar, to generate hot gases; wherein said first turbine is configured and arranged to expand hot gases from said first combustor; wherein the second combustor is configured and arranged to combust a fuel with gases from the first turbine, to generate hot gases; wherein the second turbine is configured and arranged to expand hot gases from said second combustor; a coal gasification syngas generation unit comprising an air separation unit, which receives compressed air from the compressors and having an outlet connected with the combustors configured and arranged to supply the combustors with syngas as fuel; and wherein the coal gasification syngas generation unit outlet is directly fluidly connected to the first combustor. 7. A gas turbine according to claim 6, wherein the coal gasification syngas generation unit comprises an air separation unit which functions at pressures >40 bar. 8. A gas turbine according to claim 6, wherein the coal gasification syngas generation unit comprises a coal gasifier which functions at pressures >40 bar. 9. A gas turbine according to clam 6, wherein the coal gasification syngas generation unit comprises a filtering unit which functions at pressures >40 bar. 10. A reheating gas turbine comprising: compressors for the compression of air that has been drawn in; a first turbine and second turbine; a first combustor and a second combustor, said first combustor in fluid communication with at least one of said compressors and with said first turbine, said second combustor in fluid communication with said first turbine and said second turbine; wherein the first combustor is configured and arranged to combust a fuel with compressed air from said at least one of said compressors at pressures within a range of 40-65 bar, to generate hot gases; wherein said first turbine is configured and arranged to expand hot gases from said first combustor; wherein the second combustor is configured and arranged to combust a fuel with gases from the first turbine, to generate hot gases; wherein the second turbine is configured and arranged to expand hot gases from said second combustor; a coal gasification syngas generation unit having an outlet connected with the combustors configured and arranged to supply the combustors with syngas as fuel; wherein the coal gasification syngas generation unit outlet is directly fluidly connected to the first combuster, and wherein the coal gasification syngas generation unit comprises a CO2 separator which functions at pressures >40 bar. 11. A method according to claim 1, wherein the gas turbine is part of a combined cycle power plant. 12. A gas turbine according to claim 6, further comprising: an additional compressor between the compressors of the gas turbine and the outlet of the coal gasification syngas generation unit.