Connecting structure of a cylinder and a valve of a horizontal tangential steam inlet type steam turbine

Abstract

The invention discloses a connecting structure of a cylinder and a valve of a horizontal tangential steam inlet type steam turbine. The connecting structure comprises the cylinder, a steam inlet pipeand the valve which are connected together, wherein a detachable connecting gasket is arranged between that butt end surfaces of the steam inlet pipe and the valve in a manner of sealed structure, andthe connecting gasket can prolong the axial length of the steam inlet pipe and increase arrangement spacing between the valve and the cylinder. On the premise that steam inlet tightness of the cylinder of the horizontal tangential steam inlet type steam turbine is not affected, the detachable connecting gasket is arranged between the steam inlet pipe and the valve, the axial length of the steam inlet pipe can be prolonged, and the arrangement spacing between the valve and the cylinder is increased. Therefore, in the operation requiring the steam inlet pipe to axially withdraw from the inner cylinder sealing structure, for example, the steam turbine overhaul operation, operation space for axial withdrawing of the steam inlet pipe from the inner cylinder can be cleared by disassembling theconnecting gasket between the steam inlet pipe and the valve without forcibly pulling open the valve, and the axial withdrawing operation of the whole steam inlet pipe is easy, convenient and efficient.

Description

technical field [0001] The invention relates to a steam inlet structure of a steam turbine cylinder, in particular to a connection structure between a cylinder and a valve of a horizontal tangential steam inlet type steam turbine. Background technique [0002] In the steam inlet structure of the cylinder of the steam turbine, in order to reduce the flow loss of the steam pipeline and improve the work efficiency of the steam turbine unit, more and more high-power thermal power steam turbine units adopt a steam inlet structure with valves arranged on both sides of the cylinder. [0003] The traditional side inlet steam structure see figure 1 As shown, the valve 1 is placed under the operating platform on both sides of the cylinder (mainly composed of the inner cylinder and the outer cylinder 3), and a steam pipeline with an elbow structure is arranged between the valve 1 and the cylinder. The steam inlet end of the steam pipeline is respectively sealed and connected with the ...

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Problems solved by technology

[0005] However, in the overhaul operation of the steam turbine, it is necessary to remove the upper half of the cylinder block of the outer cylinder. Since the horizontal tangential steam inlet cylinder, the steam inlet pipe and the valve are closely arranged in sequence, the valve is located in the straight pipe structure. Next to the steam inlet pipe, this results in that during the operation of removing the cylinder, due to the obstruction of the valve, the inlet pipe cannot be conveniently and easily withdrawn from the axial direction and the sealing structure of the inner cylinder, which affects the operation of removing the cylinder

The usual measure is to use the flexibility of the steam pipeline connected to the valve to forcibly pull the valve away from the side of the cylinder for a certain distance (because the valve and the steam pipeline are sealed and connected together by welding), so that the forced deviation of the valve However, this measure will easily cause the stress of the steam pipeline connected to the valve to exceed the allowable strength, which will directly affect the operation stability and safety of the steam pipeline system. , poor in convenience, reliability and stability

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