Steam turbine structure

Abstract

The invention discloses a steam turbine structure, which comprises an ultrahigh pressure cylinder, a reheating high-pressure cylinder, one or two reheating intermediate-pressure cylinders and two or three low-pressure cylinders. The ultrahigh pressure cylinder is a double-layer cylinder, an outer cylinder of the ultrahigh pressure cylinder consists of two cylindrical blocks which are connected through axial bolts, and a rotor in the ultrahigh pressure cylinder is a small-diameter rotor. Since the axial action area of the ultrahigh pressure cylinder is much smaller than that of a horizontal central parting surface, the ultrahigh pressure cylinder in the above structure has higher bearing capacity as compared with that of an existing ultrahigh pressure cylinder block which is divided into an upper half structure and a lower half structure by the central parting surface, and further, an axial flange can be arranged in a lower-pressure area, working stress of the axial flange can be greatly reduced, bearing capacity of the ultrahigh pressure cylinder can be improved further, so that the ultrahigh pressure cylinder can bear higher steam pressure.

Description

technical field [0001] The invention relates to a steam turbine, in particular to a double reheating steam turbine structure. Background technique [0002] Electricity has become the backbone of the world economy and human existence. According to the resource status of the earth, the dominant position of coal-fired power generation in the power industry will not change fundamentally for a long time. Promoting the development of clean coal-fired power generation technology, improving power station efficiency, saving resources, and reducing emissions are coal-fired power generation technology and The basic development direction of the product. Regardless of whether the primary energy used by the generating set is coal, nuclear energy or steam, as long as steam is used as the working medium for energy conversion, the steam turbine is responsible for converting steam heat energy into mechanical work, so the steam turbine is the most important factor that determines the performa...

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Problems solved by technology

Although the use of this nickel-based alloy material can withstand higher temperatures, the cost of nickel-based alloy materials is very high, and a series of key manufacturing process

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