Thermal circulation process of gas turbine based on pure oxygen or oxygen-enriched combustion

Abstract

The invention discloses a thermal circulation process of a gas turbine based on pure oxygen or oxygen-enriched combustion, which comprises the following steps: compressing liquid fuel or gas; compressing oxygen gas or oxygen-enriched air; carrying out mixed combustion of the liquid fuel or the gas and the oxygen gas or the oxygen-enriched air; spraying water for controlling temperature; expanding high temperature and high pressure flue gas after combustion in the gas turbine for applying work; cooling most of water vapor in tail gas with circulating water in a condenser, wherein the condensed water circulates to a combustion chamber to be used for spraying water for controlling temperature, and the non-condensable gas is extracted by a vacuum pump; or exhausting gas under normal pressure without the use of the vacuum pump. By adopting direct combustion of the pure oxygen or the oxygen-enriched air and adopting the water spraying mode to replace excess air for controlling temperature, the air inflow is small, the amount of compression of a compressor is small, the restriction of the optimal pressure gas ratio is eliminated, the circulating intake pressure is improved, the non-condensable gas in the tail gas is little, and the exhaust pressure can be reduced through vacuum condensation. Because the process has high circulating intake pressure and low exhaust pressure, the expansion ratio of the gas turbine is improved, thereby improving the generating efficiency.

Description

technical field

[0001] The invention relates to the technical field of thermal cycle, in particular to the technical field of gas turbine thermal cycle. Background technique

[0002] Thermal cycle is an important step in fossil energy power generation and one of the core technologies in the power industry. Its thermodynamic process mainly includes compression, isobaric heat absorption, expansion work, and isobaric heat release.

[0003] At present, there are two main forms of thermal cycle power generation: one is closed cycle, which is the commonly used coal-fired boiler steam turbine generator set at present, and the other is open cycle, which is the commonly used gas turbine generator set at present. The combination is a combined cycle generator set.

[0004] The main disadvantages of the above existing common processes are as follows:

[0005] Closed cycle, since water vapor is used as the heat carrier, indirect heating is adopted, and the temperature of the cycle inl...

Examples

Embodiment Construction

[0029] The first embodiment of the present invention, such as figure 2 As shown, the oxygen that has been produced at a pressure of 2.0Mpa is compressed to 20.0Mpa by a turbo compressor driven by a gas turbine, and the oxygen flow rate is 10000Nm 3 / h. The diesel is pressurized to 20.0Mpa by the oil pump, and the flow rate of the diesel is 4100kg / h. It is sprayed into the combustion chamber to be burned with oxygen, and chemical soft water is injected at the same time. The high-pressure and high-temperature flue gas after combustion is expanded by the gas turbine to do work. A condenser is installed after the gas turbine to cool the circulating water, most of the water vapor is condensed into liquid water and circulated back to the combustion chamber to replace the chemical soft water, a small amount of water vapor and non-condensable gas CO 2 , O 2 , use a vacuum pump to extract the vacuum pressure and control it at 0.02Mpa; on the premise that the working conditions can ...

technical field

[0001] The invention relates to the technical field of thermal cycle, in particular to the technical field of gas turbine thermal cycle. Background technique

[0002] Thermal cycle is an important step in fossil energy power generation and one of the core technologies in the power industry. Its thermodynamic process mainly includes compression, isobaric heat absorption, expansion work, and isobaric heat release.

[0003] At present, there are two main forms of thermal cycle power generation: one is closed cycle, which is the commonly used coal-fired boiler steam turbine generator set at present, and the other is open cycle, which is the commonly used gas turbine generator set at present. The combination is a combined cycle generator set.

[0004] The main disadvantages of the above existing common processes are as follows:

[0005] Closed cycle, since water vapor is used as the heat carrier, indirect heating is adopted, and the temperature of the cycle inl...

Examples

Embodiment Construction

[0029] The first embodiment of the present invention, such as figure 2 As shown, the oxygen that has been produced at a pressure of 2.0Mpa is compressed to 20.0Mpa by a turbo compressor driven by a gas turbine, and the oxygen flow rate is 10000Nm 3 / h. The diesel is pressurized to 20.0Mpa by the oil pump, and the flow rate of the diesel is 4100kg / h. It is sprayed into the combustion chamber to be burned with oxygen, and chemical soft water is injected at the same time. The high-pressure and high-temperature flue gas after combustion is expanded by the gas turbine to do work. A condenser is installed after the gas turbine to cool the circulating water, most of the water vapor is condensed into liquid water and circulated back to the combustion chamber to replace the chemical soft water, a small amount of water vapor and non-condensable gas CO 2 , O 2 , use a vacuum pump to extract the vacuum pressure and control it at 0.02Mpa; on the premise that the working conditions can ...

Images