Low-pressure steam turboset with 360-degree volute casing admission low-pressure inner cylinder

Abstract

The invention relates to a low-pressure steam turboset, particularly a low-pressure steam turboset with a 360-degree volute casing admission low-pressure inner cylinder. The low-pressure steam turboset aims to solve the following problems: the first and second inner cylinders in the existing supercritical 600MW steam turbine low-pressure steam turboset are welded through a steel plate, and the inner cylinders can deform in the welding process, thereby causing division plane steam leakage; the low-pressure inner cylinder is welded together through the steel plate, and thus, has poor rigidity; the steam in the low-pressure admission position directly flows from the upper part to the lower part, so the steam swirl is large, and the loss is high; and the outlet is not uniform, thereby not being beneficial to downstream throughflow. The low-pressure steam turboset comprises a 360-degree volute casing admission low-pressure inner cylinder, a low-pressure outer cylinder, a multistage partition assembly, an admission communicating pipe, a low-pressure exhaust guide ring and a rotor, wherein the admission communicating pipe is installed on the low-pressure outer cylinder; the 360-degree volute casing admission low-pressure inner cylinder is arranged inside the low-pressure outer cylinder; the low-pressure exhaust guide ring is installed on the 360-degree volute casing admission low-pressure inner cylinder; and the 360-degree volute casing admission low-pressure inner cylinder is sheathed on the rotor. The 360-degree volute casing admission low-pressure inner cylinder is used in the low-pressure steam turboset.

Description

technical field [0001] The invention relates to a low-pressure steam turbine unit, in particular to a low-pressure steam turbine unit with a 360° volute inlet low-pressure inner cylinder. Background technique [0002] The working principle of the low-pressure part of the existing supercritical 600MW steam turbine: the steam enters the middle part of the No. 1 and No. 2 low-pressure cylinders respectively through the middle and low pressure connecting pipes. The two low-pressure cylinders are of double-split structure. The steam flows in from the middle of the flow-through part, and after passing through the forward and reverse reaction stages, it flows to the steam exhaust port at each end, and then the steam flows downward into the condenser installed at the lower part of each low-pressure cylinder. vaporizer. There is a steam extraction port at the lower part of the cylinder, which is used to heat the water. The low-pressure No. 1 and No. 2 inner cylinders are welded with...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the No. 1 and No. 2 inner cylinders of the existing supercritical 600MW steam turbine low-pressure steam turbine unit are welded with steel plates. During the welding process, the inner cylinders will be deformed and cause steam leakage at the mid-section. Because the low-pressure inner cylinders are welded on steel plates together, poor stiffness

The steam at the low-pressure steam inlet flows directly from the upper part to the lower part, and the steam vortex is large and the loss is large; the outlet is uneven, which is not conducive to the problem of downstream flow, and then a low-pressure steam turbine with a 360° volute inlet low-pressure inner cylinder is proposed Group

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