Evacuator for water jet tank of steam turbine

Abstract

The utility model relates to the technical field of turbine water jet tank evacuation prevention, and particularly discloses a turbine water jet tank evacuation prevention device. A water outlet pipe of a water jet tank is connected with one end of an inverted U-shaped pipe; the plane where the center line of the inverted-U-shaped pipe is located is perpendicular to the liquid level in the water jetting box. Compared with the prior art, the inverted-U-shaped pipe is arranged on the water outlet pipe, so that the overflow water amount of the water jetting tank is prevented from being too large, the liquid level in the water jetting tank can be kept at a certain height, and safe and stable operation of the steam turbine is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine water jet box anti-evacuation, and specifically discloses a steam turbine water jet box anti-evacuation device. Background Art

[0002] Steam turbines are the main equipment of modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants. Steam turbines, also known as steam turbine engines, are a type of rotary steam power plant. High-temperature and high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow, which is then sprayed onto the blades, causing the rotor with the blades to rotate and perform work externally.

[0003] The water jet tank is an important component of the steam turbine assembly. In the existing steam turbine, the steam-gas mixture on the steam side of the condenser is extracted through the steam extraction pipeline and the steam extraction main gate by the water jet pump, and then pumped to the water jet tank through the water jet steam extractor, so as to establish and maintain the negative pressure in the condenser, so as to achieve the exhaust vacuum of the steam turbine generator set and improve the unit efficiency. The water temperature and water level in the water jet tank directly affect the working efficiency of the water jet vacuum extractor. In order to maintain the water temperature and water level of the water jet tank, most power plants now use continuous water replenishment to the water jet tank. In particular, the cooling effect of the equipment is poor during operation in summer, and the water temperature of the water jet tank is continuously high. If a system failure occurs, it may affect the normal operation of the entire power generation system.

[0004] In order to maintain the water level and ensure the water temperature, the water injection tank needs to increase the water replenishment, and the overflow water volume and flow rate will also increase accordingly. Therefore, when the water replenishment is stopped, due to the inertia of the water flow, the large flow rate can easily cause the liquid level in the water injection tank to be too low, affecting the safe and stable operation of the turbine. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides a steam turbine water jet box anti-evacuation device to solve the problem that when the amount of overflow water in the water jet box is large, the liquid level is easily too low, affecting the safe and stable operation of the steam turbine.

[0006] To achieve the above purpose, the technical solution of the utility model is:

[0007] A steam turbine water jet box anti-evacuation device comprises an inverted U-shaped pipe; one end of the inverted U-shaped pipe is connected to the water outlet pipe of the water jet box; the plane where the center line of the inverted U-shaped pipe is located is perpendicular to the liquid surface in the water jet box. The inverted U-shaped pipe is arranged on the water outlet pipe to avoid excessive overflow of the water jet box, ensure that the liquid level in the water jet box can maintain a certain height, and ensure the safe and stable operation of the steam turbine.

[0008] Preferably, the other end of the inverted U-shaped pipe is connected to a drain pipe, and a drain valve is provided on the drain pipe to facilitate the adjustment of the overflow water volume.

[0009] Preferably, a connecting pipe is connected between the two ends of the inverted U-shaped pipe; one end of the connecting pipe is connected to the outlet pipe, and the other end is connected to the drain pipe; a sewage valve is arranged on the connecting pipe. When cleaning the water jet tank, the sewage in the water jet tank can enter the connecting pipe through the outlet pipe and then be discharged from the drain pipe.

[0010] Preferably, the axis of the water outlet pipe, the axis of the connecting pipe and the axis of the drain pipe coincide with each other to ensure smooth drainage of sewage from the water jetting tank.

[0011] Preferably, the water outlet pipe is arranged on the outer wall of the bottom surface of the water jetting box to ensure that the sewage in the water jetting box can be drained.

[0012] Preferably, a drain pipe is provided at the top of the inverted U-shaped pipe, and an anti-siphon valve is provided on the drain pipe, so as to ensure the flow of overflow water in the inverted U-shaped pipe, avoid the occurrence of siphon phenomenon, and ensure the liquid level in the water injection tank.

[0013] The beneficial effects of the utility model are as follows: by arranging the inverted U-shaped pipe on the water outlet pipe, excessive overflow of the water jetting tank is avoided, the liquid level in the water jetting tank is ensured to be maintained at a certain height, and the safe and stable operation of the steam turbine is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Description of reference numerals:

[0017] 1- water jet tank, 2- water outlet pipe, 3- sewage valve, 4- inverted U-shaped pipe, 5- anti-siphon valve, 6- drain valve. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] like Figure 1As shown, a steam turbine water jet box anti-evacuation device is provided, wherein a water outlet pipe 2 is provided on the outer wall of the bottom surface of the water jet box 1 to ensure that the sewage in the water jet box 1 can be completely drained. The water outlet pipe 2 of the water jet box 1 is connected to one end of an inverted U-shaped pipe 4; the plane where the center line of the inverted U-shaped pipe 4 is located is perpendicular to the liquid surface in the water jet box 1. The arrangement of the inverted U-shaped pipe 4 on the water outlet pipe 2 avoids excessive overflow of the water jet box 1, ensures that the liquid level in the water jet box 1 can maintain a certain height, and ensures the safe and stable operation of the steam turbine.

[0020] In the above arrangement, the other end of the inverted U-shaped pipe 4 is connected to a drain pipe, and a drain valve 6 is provided on the drain pipe to facilitate the adjustment of the overflow water volume. A connecting pipe is connected between the two ends of the inverted U-shaped pipe 4; one end of the connecting pipe is connected to the outlet pipe 2, and the other end is connected to the drain pipe; a drain valve 3 is provided on the connecting pipe. When cleaning the water jet tank 1, the sewage in the water jet tank 1 can enter the connecting pipe through the outlet pipe 2 and then be discharged from the drain pipe. Among them, the axis of the outlet pipe 2, the axis of the connecting pipe and the axis of the drain pipe coincide, ensuring smooth drainage of the water jet tank 1.

[0021] In order to ensure the flow of overflow water in the inverted U-shaped tube 4 and avoid the siphon phenomenon, and to ensure the liquid level in the water injection tank 1, a drain pipe is provided at the top of the inverted U-shaped tube 4, and an anti-siphon valve 5 is provided on the drain pipe.

[0022] When the water shooting tank 1 is in normal use, the sewage valve 3 is closed and the drain valve 6 is opened; when the water level in the water shooting tank 1 is higher than the inverted U-shaped pipe 4, the overflow water in the water shooting tank 1 enters the inverted U-shaped pipe 4 through the outlet pipe and is then discharged from the drain pipe; when the water replenishment of the water shooting tank 1 decreases and the liquid level in the water shooting tank 1 drops to the arc-shaped bottom of the inverted U-shaped pipe 4, the anti-siphon valve 5 is set to avoid siphoning, and the overflow water is no longer discharged, thereby ensuring the liquid level in the water shooting tank 1.

[0023] When discharging sewage, open the sewage valve 3 and the drain valve 6, and the sewage in the water jet tank 1 enters the outlet pipe and enters the drain pipe through the connecting pipe to be discharged.

[0024] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions shall be within the scope of the utility model / any person of ordinary skill in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the utility model, and they shall be within the scope of protection of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope of protection of the claims.

Claims

1. A steam turbine water jet box anti-evacuation device, characterized in that: The invention comprises an inverted U-shaped pipe (4); one end of the inverted U-shaped pipe (4) is connected to a water outlet pipe (2) of a water shooting box (1); a plane where the center line of the inverted U-shaped pipe (4) is located is perpendicular to the liquid surface in the water shooting box (1); the other end of the inverted U-shaped pipe (4) is connected to a drainage pipe, and a drainage valve (6) is provided on the drainage pipe; and an emptying pipe is provided at the top end of the inverted U-shaped pipe (4), and an anti-siphon valve (5) is provided on the emptying pipe.

2. The steam turbine water jet box anti-evacuation device according to claim 1, characterized in that: A connecting pipe is connected between the two ends of the inverted U-shaped pipe (4); one end of the connecting pipe is connected to the water outlet pipe (2), and the other end is connected to the drainage pipe; a sewage valve (3) is provided on the connecting pipe.

3. The steam turbine water jet box anti-evacuation device according to claim 2, characterized in that: The axis of the water outlet pipe (2), the axis of the connecting pipe and the axis of the drainage pipe coincide with each other.

4. The steam turbine water jet box anti-evacuation device according to claim 3, characterized in that: The water outlet pipe (2) is arranged on the outer wall of the bottom surface of the water jet box (1).

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