Huang Rong, deputy general manager of the Gas Turbine Division of Harbin Power Station Group, and Yang Qiguo, executive deputy general manager of Harbin Electric Power Company, attended the review meeting. After review, experts agreed that the optimized design has reached the international advanced level, and the optimized steam turbine can replace the foreign D10 model. The success of the unit's autonomous design scheme indicates that Harbin has achieved a new leap in the gas-steam turbine combined cycle turbine, which is of great significance for improving the state-owned brand and promoting economic development.
The 9F gas-steam combined cycle unit optimized steam turbine reviewed by the company is a design and operation of several 9E gas-steam turbine combined cycle turbines. It analyzes, researches and produces multiple 9F gas-steam. On the basis of the turbine combined cycle unit D10 steam turbine, the design is autonomously optimized. The optimized design adopts full three-dimensional aerodynamic design technology, which greatly improves the aerodynamic performance of the cascade. The multi-tooth stepped steam seal structure of the high and medium pressure moving blade tip has obvious effect on solving the air leakage of the original unit, and the whole machine has a short manufacturing cycle. , economical, safe and reliable.
Xu Yingnan pointed out that the gas turbine power plants installed in China all use foreign technology. With the new requirements of the country for independent intellectual property rights and comprehensive economics, Haqi Company took the lead in proposing a localization plan in China to bring a good start to the national power development. At the same time, the strong market competition value of the Haqi unit is also required by the state. The development direction of power equipment manufacturing enterprises.
China began preparations for the production of gas turbines in 2002. By 2004, Harbin Power Station Group, Shanghai Electric Group, Dongfang Electric Group and Japan Mitsubishi, the United States GE, Alstom, Siemens and other companies have cooperated in two rounds of bidding. Among them, the Ha Power Station won 17 bids, the East won 10 bids, and the Shanghai won 9 bids.
Among the 12 units that have been completed, there are 10 Harbin Electric and 2 East, of which 3 have already generated electricity. In the second half of 2005, it is expected to complete 10 units. Harbin Electric Group adopted GE's D10 unit technology, and the users responded well. On this basis, in order to get rid of this prototype unit, Haqi has its own leading products, and the technicians have optimized and improved the unit, and successfully launched an optimized steam turbine with independent intellectual property rights in China.
ELECTRIC DRIVE CUTTING TORCH CARRIAGE
An improvement over mechanical guides is an electric motor-driven cutting torch carriage. The speed of the motor can be varied allowing the welder to cut to dimensions and to cut at a specific speed. A typical motor driven carriage has four wheels: one driven by a reduction gear, two on swivels (castor style), and one freewheeling. The torch is mounted on the side of the carriage and is adjusted up and down by a gear and rack. The rack is a part of the special torch. The torch also can be tilted for bevel cuts. This machine comes with a straight two-groove track and has a radial bar for use in cutting circles and arcs. A motor-driven cutting torch cutting a circle is shown in figure 4-25. The carriage is equipped with an off-and-on switch, a reversing switch, a clutch, and a speed-adjusting dial that is calibrated in feet per minute.
Figure 4-25.-Electric motor-driven carriage being used to cut a circle in steel plate.
Figure 4-26 shows an electric drive carriage on a straight track being used for plate beveling. The operator must ensure that the electric cord and gas hoses do not become entangled on anything during the cutting operation. The best way to check for hose, electric cord, and torch clearance is to freewheel the carriage the full length of the track by hand.
Figure 4-26.-Electric motor-driven carriage being used on straight track to cut a beveled edge on steel plate.
You will find that the torch carriage is a valuable asset during deployment. This is especially true if your shop is called upon to produce a number of identical parts in quantity. Such an assignment might involve the fabrication of a large supply of handhole covers for runway fixtures, or another assignment might be the production of a large quantity of thick base plates for vertical columns. When using the torch carriage, you should lay the track in a straight line along a line parallel to the edge of the plate you are going to cut. Next, you light the torch and adjust the flame for the metal you are cutting. Move the carriage so the torch flame preheats the edge of the plate and then open the cutting oxygen valve and turn on the carriage motor. The machine begins moving along the track and continues to cut automatically until the end of the cut is reached. When the cut is complete, you should do the following: promptly turn off the cutting oxygen, turn off the current, and extinguish the flame--in that order. The cutting speed depends upon the thickness of the steel being cut
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