Cylinder structure with built-in steam seal pipeline and steam seal pressure regulator

Abstract

The present invention relates to a cylinder structure with a built-in steam seal pipeline and a steam seal pressure regulator. A steam seal balance pipeline and a steam seal exhaust pipeline are built into the flange position of the middle face of the lower cylinder, and the steam seal balance pipeline and the steam seal exhaust pipeline are sealed with the inside of the cylinder through the middle face of the upper cylinder. The steam seal balance pipeline is connected to the main steam inlet pipeline through a steam seal air supply valve on the side of the upper cylinder, and the steam seal steam supply is adjusted through the steam seal steam supply valve. A steam seal pressure adjustment mechanism is provided on the main steam inlet pipeline. By adjusting the gap of the main steam inlet pipeline, the pressure of the main steam entering the steam seal balance pipeline is adjusted to keep the steam seal system balanced. The present invention greatly reduces the supporting pipelines of the steam turbine through the cylinder structure with built-in steam seal pipelines and steam seal pressure regulators, and at the same time reduces the external steam seal adjustment device, improves the integration degree of the high-speed marine steam turbine, and increases the maintenance space of the equipment; removes the constraint of the pipeline on the axial expansion of the steam turbine, which is beneficial to the vibration reduction and noise reduction design of the equipment.

Description

Technical Field

[0001] The invention relates to a marine condensing steam turbine, in particular to a cylinder structure of a marine condensing steam turbine. Background Art

[0002] The steam seal system is mainly used to prevent steam from leaking from the cylinder into the turbine installation site, and to prevent air from leaking into the cylinder, affecting the vacuum degree of the unit and causing accelerated oxidation of the equipment. Another function of the steam seal system is to recover steam leakage from the high-pressure regulating valve and the high-pressure steam seal of the turbine, recover heat, and improve the thermal efficiency of the secondary circuit system.

[0003] Due to the limited space, marine steam turbines use a pressure equalizing box structure (steam seal pressure adjustment function) to adjust the steam seal pressure based on the land-based steam turbine steam seal system. The pressure equalizing box replenishes new steam to the low-pressure steam seal through external pipelines to provide the high-pressure steam required when the unit is insufficiently self-balanced; the steam extraction system introduces steam seal leakage into the vacuum pump through external pipelines (such as Figure 1 as shown).

[0004] The main problems of existing marine steam seal systems are: the space is cramped and narrow, and multiple thick steam seal pipelines and steam seal pressure adjustment devices are arranged around the steam turbine, which increases the complexity of the system; at the same time, the temperature of the steam seal pipeline is lower than that of the cylinder, and its expansion deformation restricts the deformation of the cylinder, which is not conducive to the vibration and noise reduction of the steam turbine; furthermore, the pipeline affects the maintenance space of the steam turbine, increases the maintenance time of the unit, and is not conducive to the unit's rapid resumption of normal operation. Summary of the invention

[0005] In order to improve the integration level of marine steam turbines and increase the maintenance space of the equipment, the present invention proposes a cylinder structure with built-in steam seal pipelines and steam seal pressure regulators. After the application of this structure, the steam seal balance pipeline, steam seal extraction pipeline and steam seal balance box (steam seal pressure adjustment) of the unit can be eliminated and integrated with the cylinder structure; at the same time, a large number of steam seal pipelines are eliminated, which greatly increases the maintenance space of the unit.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a cylinder structure with a built-in steam seal pipeline and a steam seal pressure regulator, comprising an upper cylinder, a lower cylinder, a steam seal balance pipeline, and a steam seal exhaust pipeline. The steam seal balance pipeline and the steam seal exhaust pipeline are built into the flange position of the middle dividing surface of the lower cylinder, and the steam seal balance pipeline and the steam seal exhaust pipeline are sealed with the interior of the cylinder through the middle dividing surface of the upper cylinder. The steam seal balance pipeline is connected to the main steam inlet pipeline through the steam seal air supply valve on the side of the upper cylinder, and the steam seal steam supply is adjusted through the steam seal steam supply valve. A steam seal pressure adjustment mechanism is provided on the main steam inlet pipeline. By adjusting the gap of the main steam inlet pipeline, the pressure of the main steam entering the steam seal balance pipeline is adjusted to keep the steam seal system balanced.

[0007] Furthermore, the steam seal exhaust pipeline, steam seal balance pipeline, steam seal air supply valve and steam seal pressure adjustment mechanism in the upper cylinder and the lower cylinder are integrated with the steam turbine.

[0008] Furthermore, the steam seal pressure adjustment mechanism is composed of a main steam inlet pipeline and a regulating valve stem, and the regulating valve stem is arranged at the bottom of the main steam inlet pipeline.

[0009] Furthermore, the regulating valve stem is connected to the upper cylinder via threads.

[0010] The beneficial effects of the present invention are:

[0011] The present invention greatly reduces the supporting pipelines of the steam turbine through the cylinder structure with built-in steam seal pipelines and steam seal pressure regulators, while reducing external steam seal adjustment devices, thereby improving the integration level of high-speed marine steam turbines and increasing the maintenance space of the equipment; and removes the constraint of the pipeline on the axial expansion of the steam turbine, which is beneficial to the vibration and noise reduction design of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the schematic diagram of the existing steam seal system;

[0013] Figure 2 is a schematic diagram of the improved steam seal system of the present invention;

[0014] Figure 3 It is a schematic diagram of the integrated structure of the steam seal pipeline;

[0015] Figure 4 It is a schematic diagram of the integrated structure of the steam seal steam supply pipeline;

[0016] Figure 5 It is a schematic diagram of the steam seal and steam supply structure. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figures 2 to 5 As shown, the cylinder structure of the built-in steam seal pipeline and steam seal pressure regulator of the present invention includes an upper cylinder 1, a lower cylinder 2, a steam seal balance pipeline 3, and a steam seal exhaust pipeline 4.

[0019] The steam seal balance pipeline 3 and the steam seal exhaust pipeline 4 are built into the flange position of the middle face of the lower cylinder 2, and the pipeline is sealed with the inside of the cylinder through the middle face of the upper cylinder 1 (such as Figure 3 , as shown in 4). The steam seal balance pipeline 3 is connected to the main steam inlet pipeline 8 through the steam seal air supply valve 5 on the side of the upper cylinder 1, and the steam seal air supply is regulated through the steam seal air supply valve 5. Figure 5As shown, a steam seal pressure adjustment mechanism 6 is provided on the main steam inlet pipeline 8, which adjusts the gap S of the main steam inlet pipeline 8 to adjust the pressure of the main steam 11 entering the steam seal balance pipeline 3, so that the steam seal system remains balanced. The steam seal exhaust pipeline 4 is connected to the steam seal exhaust system through the exhaust pipe 10.

[0020] The steam seal exhaust pipeline 4, steam seal balance pipeline 3, steam seal air supply valve 5 and steam seal pressure adjustment mechanism 6 in the upper cylinder 1 and the lower cylinder 2 are integrated with the steam turbine 7. With the goal of controlling the steam seal balance pressure to a slightly positive pressure, the steam seal regulating valve of the upper cylinder is adjusted to ensure the self-balancing of the steam seal system.

[0021] The steam seal pressure adjustment mechanism 6 is composed of a main steam inlet pipeline 8 and a regulating valve stem 9. The regulating valve stem 9 is arranged at the bottom of the main steam inlet pipeline 8. The regulating valve stem 9 is connected to the upper cylinder 1 through a thread.

Claims

1. A cylinder structure with a built-in steam seal pipeline and a steam seal pressure regulator, comprising an upper cylinder, a lower cylinder, a steam seal balance pipeline, and a steam seal exhaust pipeline, characterized in that: The steam seal balance pipeline and the steam seal exhaust pipeline are built into the flange position of the middle dividing surface of the lower cylinder, and the steam seal balance pipeline and the steam seal exhaust pipeline are sealed with the inside of the cylinder through the middle dividing surface of the upper cylinder. The steam seal balance pipeline is connected to the main steam inlet pipeline through the steam seal air replenishing valve on the side of the upper cylinder, and the steam seal balance is adjusted through the steam seal air replenishing valve. A steam seal pressure adjustment mechanism is provided on the main steam inlet pipeline. By adjusting the gap between the bottom of the main steam inlet pipeline and the regulating valve stem, the pressure of the main steam entering the steam seal balance pipeline is adjusted to keep the steam seal system balanced; the steam seal exhaust pipeline, steam seal balance pipeline, steam seal air replenishing valve and steam seal pressure adjustment mechanism in the upper and lower cylinders are integrated with the turbine; the steam seal pressure adjustment mechanism is composed of a main steam inlet pipeline and a regulating valve stem, and the regulating valve stem is arranged at the bottom of the main steam inlet pipeline; the regulating valve stem is connected to the upper cylinder through a thread.

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