Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Patent
1997-08-05
1999-07-13
Thorpe, Timothy S.
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
60722, 431155, 431154, F02C 720
Patent
active
059210753
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a burner replacing system used in removing or reassembling burners to inspect or repair the burners of a gas turbine for thermal power generation.
2. Description of Related Art
FIGS. 12a and 12b are drawings for explaining a prior art method for replacing burners in inspecting or repairing the burners of a gas turbine for thermal power generation. In the figure, 16 or so burners b are arranged radially at equal intervals at the middle part of the main body of a gas turbine g, and are inserted and assembled thereto via flanges f. Conventionally, the burner b is replaced manually by constructing simple scaffolds s, after removing pipes and other equipment around the burner b, and manipulating an overhead traveling crane c to sling the burner b by workers who get on the scaffolds.
While the burner b is replaced conventionally by the manual work as described above, the burner b is about 400 mm in outer diameter and is as long as about 1500 mm, so that workers have to enter the inside of the gas turbine g to lift up and bring out the burner b manually, in cooperation with the workers who get on the scaffolds s, in pulling out the burner b. The burner b is then slung by the overhead traveling crane c and is moved to an inspection or repair site. While it takes a long time to do that because one burner b weighs about 250 kg and needs to be divided into several parts, there is a structural limit, and some of the parts weigh around 100 kg. Therefore, because it is difficult to maintain an adequate position during the work in the narrow inner space of the gas turbine g and on the unstable outside scaffolds s, such work involves great danger. Further, because the working conditions are so bad, the burner b or the inside of the gas turbine g is damaged occasionally, taking more time and expense to repair them.
Accordingly, it is an object of the present invention to solve the aforementioned problem by providing a novel burner replacing system.
SUMMARY OF THE INVENTION
A burner replacing system of the present invention is constructed such that a rail is provided in a ring around the circumference of the gas turbine, where burners are disposed radially, such that a carriage can turn around the burners on the rail. The carriage carries a pull-out slide via a rotary shaft, which can turn the slide up and down in the direction of the center axis of the gas turbine, and via a rotary shaft which turns the slide right and left around the radial axis of the gas turbine. A hand is supported by the pulling-out slide via a centering slide which moves up and down in the direction of the diameter of the burner so as to be able to grip the burner.
The burner may be replaced by using the burner replacing system of the present invention by locating the center position of each burner in the circumferential direction with the carriage which turns around the burners. The hand is extended to the surface of a flange of the burner with the pulling-out slide to cause the center of the hand to coincide with the position of the center axis of the burner, also using the centering slide to adjust the surface of the hand to the inclination of the surface of the flange of the burner by the rotary shafts. The flange of the burner is connected with the hand, the pulling-out slide pulls out the burner from the gas turbine, and the burner is raised by the rotary shaft. The carriage is then turned to move the burner to the upper part of the gas turbine where the overhead traveling crane can reach, and the burner is slung to the overhead traveling crane to carry it out. Then an alternate burner is grasped with the hand to reassemble the gas turbine by implementing the above-mentioned procedure in the opposite way. Thereby, the burner replacing work is mechanized and the burner may be replaced at one time without requiring so much man power and without dividing it into parts. The work period may thus be shortened and the man power used in replacing the burners can
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Satoh Yoshichika
Shimoyama Hiroshi
Tsunewaki Hiroshi
Yashiki Tadao
Kim Ted
Mitsubishi Jukogyo Kabushiki Kaisha
Thorpe Timothy S.
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