Micro Gas Turbine System

• US 20080216461A1
• Filed: 12/14/2005
• Published: 09/11/2008
• Est. Priority Date: 12/14/2005
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Nakano, Susumu, Dodo, Satoshi, Inoue, Hisamichi, Shiraiwa, Hiroyuki
• Application Number:
  US11/995,967
• Publication Number:
  US 20080216461A1
• Time in Patent Office: Days
• US Class Current: 60/39.53
• CPC Class Codes: F02C 3/30 Adding water, steam or other fluids for influencing combustion, e.g. to obtain cleaner exhaust gases F02C7/141, F02C7/30, F01D21/00, F01K21/04, F23D11/10 take precedence
• CPC Class Codes: F02C 6/18 using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10
• CPC Class Codes: F02C 7/08 Heating air supply before combustion, e.g. by exhaust gases
• CPC Class Codes: F05D 2250/82 Micromachines

Abstract

A micro gas turbine system is provided which increases power generation efficiency and output of power generation by means of water spray and which can exercise effective water spray control with simple control. The micro gas turbine system, according to the present invention, including a compressor, a combustor, a regenerative heat exchanger, a generator and a power transducer is provided with a plurality of spray water supply lines which include spray water nozzles and shutoff valves and which supply a prescribed amount of spray water by opening and closing the shutoff valves.

Claims

1. A micro turbine system comprising:

a compressor (2) for compressing air;

a combustor (6) for burning the compressed air and fuel;

a turbine (1) driven by combustion gas generated by the combustor;

a regenerative heat exchanger (5) for performing heat exchange between the exhaust gas of the turbine and the compressed air led to the combustor;

a generator (3) for converting expansion work of the turbine into electric power;

a power transducer (4) for temporarily converting electric power from the generator into direct current and then converting the direct current into alternating current power with a commercial frequency; and

a plurality of spray water supply lines including spray water nozzles (41, 47, and 48) and shutoff valves (41, 47, and 48) and supplying a prescribed amount of spray water by opening and closing the shutoff valves.

2. The micro turbine system according to claim 1, further comprising:

air pipes (49 and 11) disposed downstream of the compressor and adapted to swirl air to be discharged from the compressor on the upstream side of the direction in which the air flows into the regenerative heat exchanger;

wherein water drops sprayed from the spray water nozzles are sprayed in the swirl formed by the air pipes.

3. The micro turbine system according to claim 1, further comprising:

a circulating water pump (15) for supplying cooling water cooling the generator and the power transducer;

a circulating water tank (14) adapted to store therein cooling water circulated by the circulating water pump;

a radiator (16) for causing the circulating water to radiate its heat energy;

a water purifying apparatus (24) for purifying water led from the outside of the system, into purified water;

a spray water tank (26) adapted to store therein water from the water purifying apparatus;

a spray water pump (27) for supplying the water stored in the spray water tank;

a connection pipe (23) for connecting the spray water tank with the circulating water tank; and

a shutoff valve (21) provided in the connection pipe.

4. The micro turbine system according to claim 3, further comprising:

level gauges (56 and 57) provided in the spray water tank and the circulating water tank, respectively, to measure respective water levels thereof; and

water control means (90) for operating the water purifying apparatus when the level gauge of the spray water tank is below a prescribed height;

for stopping the water purifying apparatus when the level gauge of the spray water tank reaches the prescribed height;

for opening the shutoff valve provided in the connection pipe connecting the circulating water tank with the spray water tank when the level gauge of the circulating water tank is below a prescribed height; and

for closing the shutoff valve when the level gauge of the circulating water tank returns to the prescribed height.

5. The micro turbine system according to claim 1, further comprising:

a circulating water pump (15) for supplying cooling water cooling the generator and the power transducer;

a circulating water tank (14) adapted to store cooling water circulated by the circulating water pump;

a radiator (16) for causing circulating water to radiate its heat energy;

a water purifying apparatus (24) for purifying water led thereto from the outside of the system, into purified water;

a spray water tank (26) adapted to store therein water from the water purifying apparatus;

a spray water pump (27) for supplying the water stored in the spray water tank; and

a connection pipe (58) for connecting an overflow pipe of the spray water tank with the circulating water tank.

6. The micro turbine system according to claim 5, further comprising:

level gauges (56 and 57) provided in the spray water tank and the circulating water tank, respectively, to measure respective water levels thereof; and

water control means (90) for operating the water purifying apparatus when any one of the level gauge of the spray water tank and the level gauge of the circulating water tank is below a prescribed height for each; and

for stopping the water purifying apparatus when both the level gauges reach the prescribed heights.

7. The micro gas turbine system according to claim 3, further comprising:

a heater (67) disposed in the circulating water tank;

wherein when the turbine is stopped, the heater is turned on.

8. A micro gas turbine system comprising:

a compressor (2) for compressing air;

a combustor (6) for burning the compressed air and fuel;

a turbine (1) driven by combustion gas generated by the combustor;

a regenerative heat exchanger (5) for performing heat exchange between exhaust gas of the turbine and the compressed air led to the combustor;

a generator (3) for converting expansion work of the turbine into electric power;

a power transducer (4) for temporarily converting electric power from the generator into direct current and then converting the direct current into alternating current power with a commercial frequency; and

air pipes (49 and 11) disposed downstream of the compressor and adapted to swirl air to be discharged from the compressor on the upstream side of the direction in which the air flows into the regenerative heat exchanger;

wherein water drops sprayed from the spray water nozzles are sprayed in the swirl formed by the air pipes.