CN208153074U - A Cooling System Applied to Circumferential Steam Injection of Low Pressure Cylinder of 200MW Three-cylinder Three-row Steam Turbine - Google Patents

Abstract

The utility model provides a be applied to cooling system that circumference that three exhaust steam turbine low pressure jar of 200MW three-cylinder spouts vapour, belongs to the turbine low pressure jar cooling field. The problem of in the electric power industry implementation combined heat and power production process, the low pressure cylinder zero power operation, but because the continuous motion of turbine unit rotor makes the temperature in the low pressure cylinder higher, influence the working property of low pressure cylinder is solved. The middle annular cooling pipe of the utility model is coiled on the outer wall of the pipeline of the air outlet part of the low pressure cylinder of the steam turbine; the multilayer spraying devices are arranged in parallel and are fixed on the inner wall of the air outlet pipeline of the low-pressure cylinder of the steam turbine from top to bottom; all nozzles on each layer of spraying device spray mist anticlockwise or clockwise, so that the mist spirally moves downwards around the steam delivered by the air outlet pipeline of the low-pressure cylinder of the steam turbine clockwise or anticlockwise. The utility model discloses mainly used cools down to three rows of steam turbine low pressure jar of 200MW three jar.

Description

A cooling method of circumferential steam injection applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine system

technical field

The utility model belongs to the field of cooling the low-pressure cylinder of a steam turbine.

Background technique

The medium and low pressure connecting pipe of the steam turbine is a pipe connecting the medium pressure exhaust port of the medium pressure cylinder and the low pressure inlet of the low pressure cylinder in the steam turbine. The aerodynamic performance of its structure is not only related to the steam loss of the connecting pipe itself, but also to the The efficiency of the cylinder section has a significant impact. In recent years, with the continuous advancement of the country's supply-side structural reform process and the acceleration of social urbanization, the orderly planning and development of the power industry is crucial. Moreover, with the continuous promotion of urbanization, hundreds of millions of farmers will also flood into cities from rural areas in the future. The demand for urban heating will continue to increase, and environmental governance will become increasingly stringent. Heating potential, improving the degree of urban centralized heating, and promoting the elimination of backward small boilers in the region have become urgent concerns; at present, under the encouragement and promotion of the national energy-saving and emission-reduction It has become an inevitable trend to implement combined heat and power generation in some regions, and to increase the heating capacity through technological transformation and improve the economy of heating operation.

At present, in the process of cogeneration of heat and power, the low-pressure cylinder still uses the low-pressure rotor of the original unit. The low-pressure rotor can only serve as a connection during the heating period. One way of exhaust steam from the medium-pressure cylinder of the three-row steam turbine is used for heating through the pipeline, and the other is used for air supply to the low-pressure cylinder. Although the low-pressure cylinder operates at zero power, due to the continuous movement of the rotor of the steam turbine set, The high temperature will affect the working performance of the entire low-pressure cylinder, and even seriously affect the entire steam turbine unit. Therefore, it is urgent to provide a cooling system to cool the low-pressure cylinder.

Utility model content

The utility model is to solve the problem that the low-pressure cylinder runs at zero power during the cogeneration process of the electric power industry, but due to the continuous movement of the rotor of the steam turbine unit, the temperature in the low-pressure cylinder is relatively high, which affects the working performance of the low-pressure cylinder. The utility model provides a cooling system for circumferential steam spraying applied to a low-pressure cylinder of a 200MW three-cylinder three-row steam turbine.

A cooling system for circumferential steam spraying applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine, including an annular cooling pipe, a cooler, a water storage tank, a water pump and a multi-layer spray device;

The annular cooling pipe is coiled on the outer wall of the gas outlet pipeline of the low-pressure cylinder of the steam turbine; the installation direction of the gas outlet pipeline is vertical;

The multi-layer spraying device is arranged in parallel and fixed on the inner wall of the outlet pipe of the steam turbine low-pressure cylinder from top to bottom;

All the nozzles on each layer spray device spray the mist counterclockwise or clockwise, so that the mist moves clockwise or counterclockwise around the steam delivered by the outlet pipeline of the low-pressure cylinder of the steam turbine; the spray direction of all spray devices same;

Each layer of spraying device includes a plurality of V-shaped fixing frames, which are evenly arranged along the inner wall of the gas outlet pipeline of the low-pressure cylinder of the steam turbine, and a plurality of nozzles are arranged on the V-shaped fixing frame;

The water pump is used to pump the cooling water in the water storage tank into the spray device and the annular cooling pipe, and the water outlet of the annular cooling pipe is connected with the cooler;

The water outlet of the cooler communicates with the water inlet of the water storage tank;

A cooler for cooling the liquid flowing into it.

Preferably, the cooling system for circumferential steam injection applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine also includes a multi-layer cooling wet curtain,

Each layer of cooling wet curtain is fixed in the outlet pipeline of the low-pressure cylinder of the steam turbine through a support frame, and is used to cool down the steam passing through its body.

Multi-layer cooling wet curtains and multi-layer spray devices are arranged alternately.

Preferably, the cooling wet curtain is a circular body, the thickness of the circular body is h, and a serpentine cooling pipe is arranged in the circular body;

The water inlet of the serpentine cooling pipe is connected with the water outlet of the water pump,

The water outlet of the serpentine cooling pipe communicates with the water inlet of the cooler.

The beneficial effects brought by the utility model are as follows: firstly, the V-shaped fixed frame is set into a "V" shape, so that the two sides of the V-shaped fixed frame present a certain angle, and the two nozzles ejected from the V-shaped two sides One of the aerosols in the aerosol compensates the impact force of the other aerosol, and finally can be merged into an aerosol, which increases the starting speed of the tangential jet of the aerosol, thereby prolonging the movement path of the aerosol to cool the steam.

Second, the lower-layer multi-layer spray device in the multi-layer spray device performs secondary cooling on the steam flowing through the upper layer multi-layer spray device, and the progressive cooling method improves the pressure on the steam in the gas outlet pipeline of the low-pressure cylinder of the steam turbine. cooling effect.

Third, make the gas mist spiral downward around the gas outlet pipeline of the steam turbine low-pressure cylinder in a clockwise or counterclockwise direction, which increases the movement path of the gas mist and further improves the anti-corrosion effect on the gas outlet pipeline of the steam turbine low-pressure cylinder. Cooling effect of steam.

In summary, the cooling effect of the circumferential steam injection cooling system applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine described in the utility model can be increased by more than 30%.

Description of drawings

Fig. 1 is a schematic diagram of the principle of a cooling system for circumferential steam spraying applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine described in the utility model;

Fig. 2 is the structural representation of spray device;

Fig. 3 is a structural schematic diagram of a cooling wet curtain.

Detailed ways

Specific Embodiment 1: Refer to Fig. 1 and Fig. 2 to illustrate this embodiment, a kind of cooling system applied to the circumferential steam injection of the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine described in this embodiment, comprising an annular cooling pipe 1, a cooling Device 2, water storage tank 3, water pump 4 and multi-layer spraying device 5;

The annular cooling pipe 1 is coiled on the outer wall of the outlet pipeline 6 of the low-pressure cylinder of the steam turbine; the installation direction of the outlet pipeline 6 is the vertical direction;

The multi-layer spraying device 5 is arranged in parallel, and is fixed on the inner wall of the gas outlet pipeline 6 of the low-pressure cylinder of the steam turbine from top to bottom;

All the nozzles 5-2 on the spraying device 5 of each layer spray the gas mist counterclockwise or clockwise, so that the steam spirally moves downward around the gas outlet pipeline 6 of the steam turbine low-pressure cylinder in a clockwise or counterclockwise direction; all layers The jet direction of spray device 5 is the same;

Every layer of spraying device 5 comprises a plurality of V-shaped fixed mounts 5-1, and the V-shaped fixed mounts 5-1 are evenly arranged along the circumference of the gas outlet pipeline 6 inner wall of the steam turbine low-pressure cylinder, and the V-shaped fixed mounts 5-1 are provided with multiple 5-2 nozzles;

The water pump 4 is used to pump the cooling water in the water storage tank 3 into the spray device 5 and the annular cooling pipe 1, and the water outlet of the annular cooling pipe 1 communicates with the cooler 2;

The water outlet of the cooler 2 communicates with the water inlet of the water storage tank 3;

The cooler 2 is used to cool down the liquid flowing into it.

In the present embodiment, the V-shaped fixed frame 5-1 is arranged in a "V" shape, so that the two sides of the V-shaped fixed frame 5-1 present a certain angle, and the nozzles 5-2 on both sides of the V-shaped One of the two streams of mist compensates for the impact of the other stream of mist, and finally merges into one stream of mist to increase the starting speed of the tangential jet flow of the mist, thus prolonging the movement path of the mist to cool the steam .

The lower layer of the multi-layer spraying device 5 in the multi-layer spraying device 5 performs secondary cooling on the steam flowing through the upper layer of the multi-layer spraying device 5, and the progressive cooling method improves the temperature of the steam in the outlet pipeline 6 of the low-pressure cylinder of the steam turbine. cooling effect.

Make the aerosol move downward in a spiral clockwise or counterclockwise around the steam outlet pipeline 6 of the low-pressure cylinder of the steam turbine, which increases the movement path of the aerosol and further improves the impact on the steam in the outlet pipeline 6 of the low-pressure cylinder of the steam turbine. cooling effect.

The V-shaped fixed frame 5-1 is a hollow tube with both ends closed, and the hollow tubes at the relative positions of all the layer spray devices 5 are connected to receive the cooling water from the water storage tank 3, and the gas outlet pipeline 6 of the low-pressure cylinder of the steam turbine. There is a through hole on it, which is used to introduce the cooling water from the water storage tank 3 into the V-shaped fixed frame 5-1.

Specific embodiment 2: Refer to Fig. 1 to Fig. 3 to illustrate this embodiment, the difference between this embodiment and a kind of cooling system of circumferential steam injection applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine described in the specific embodiment is that , also includes a multi-layer cooling wet curtain 7,

Each layer of cooling wet curtain 7 is fixed in the outlet pipeline 6 of the low-pressure cylinder of the steam turbine through a support frame, and is used to cool the steam passing through its body,

Multi-layer cooling wet curtains 7 and multi-layer spraying devices 5 are alternately arranged.

In this embodiment, the cooling wet curtain 7 can cool down the center of the steam flow in the outlet pipeline 6 of the low-pressure cylinder of the steam turbine, further improving the cooling effect on the steam.

Specific embodiment three: Refer to Fig. 1 to Fig. 3 to illustrate this embodiment, the difference between this embodiment and a kind of cooling system of circumferential steam injection applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine described in the second embodiment is that , the cooling wet curtain 7 is a circular body, the thickness of the circular body is h, and a serpentine cooling pipe 7-1 is arranged in the circular body;

The water inlet of the serpentine cooling pipe 7-1 communicates with the water outlet of the water pump 4,

The water outlet of the serpentine cooling pipe 7-1 communicates with the water inlet of the cooler 2.

In this embodiment, the serpentine cooling pipe 7 - 1 continuously feeds cooling water to continuously cool down the cooling wet curtain 7 .

The water inlets of the serpentine cooling pipes 7-1 in all layers of cooling wet curtains 7 are connected, and the water outlets of the serpentine cooling pipes 7-1 in all layers of cooling wet curtains 7 are connected. Two through holes are opened, and the two through holes are respectively used to introduce cooling water to the water inlet of the serpentine cooling pipe 7-1, and draw high-temperature water from the water outlet of the serpentine cooling pipe 7-1.

The structure of a cooling system for circumferential steam spraying applied to the low-pressure cylinder of a 200MW three-cylinder three-row steam turbine described in the utility model is not limited to the specific structures described in the above-mentioned embodiments, and can also be the ones described in the above-mentioned embodiments. Reasonable combination of technical features.

Claims (3)

1. a kind of cooling system of the circumferential spray vapour applied to tri- cylinder three-exhauster turbine low pressure (LP) cylinder of 200MW, which is characterized in that including Annular cooling pipe (1), cooler (2), water tank (3), water pump (4) and multilayer spraying device (5)；

Annular cooling pipe (1) is coiled on outlet portion pipeline (6) outer wall of turbine low pressure cylinder；The setting of outlet portion pipeline (6) Direction is vertical direction；

Multilayer spraying device (5) is arranged in parallel, and is from top to bottom fixed on the inner wall of the outlet portion pipeline (6) of turbine low pressure cylinder On；

All nozzles (5-2) on every layer of spraying device (5) are counterclockwise or spray aerosol clockwise, make aerosol clockwise or the inverse time The steam downward spiral movement that needle is conveyed around the outlet portion pipeline (6) of turbine low pressure cylinder；The spray of all layers of spraying device (5) Gas direction is identical；

Every layer of spraying device (5) includes multiple V-type fixed frames (5-1), outlet of the V-type fixed frame (5-1) along turbine low pressure cylinder Portion's pipeline (6) inner wall is circumferentially uniformly arranged, and V-type fixed frame (5-1) is equipped with multiple nozzles (5-2)；

Water pump (4), for the cooling water in water tank (3) to be pumped into spraying device (5) and annular cooling pipe (1), annular The water outlet of cooling pipe (1) is connected to cooler (2)；

The water outlet of cooler (2) is connected to the water inlet of water tank (3)；

Cooler (2), for cooling down to the liquid for flowing into its inside.

2. a kind of cooling of circumferential spray vapour applied to tri- cylinder three-exhauster turbine low pressure (LP) cylinder of 200MW according to claim 1 System, which is characterized in that it further include that multilayer is cooling wet curtain (7),

Every layer of cooling wet curtain (7) is fixed in the outlet portion pipeline (6) of turbine low pressure cylinder by support frame, and for passing through The steam of its ontology cools down,

Multilayer cooling wet curtain (7) is alternately arranged with multilayer spraying device (5).

3. a kind of cooling of circumferential spray vapour applied to tri- cylinder three-exhauster turbine low pressure (LP) cylinder of 200MW according to claim 2 System, which is characterized in that cooling wet curtain (7) are circular body, circular body with a thickness of h, be equipped in circular body snakelike cold But (7-1) is managed；

The water inlet of spiral coil cooling tube (7-1) is connected to the water outlet of water pump (4),

The water outlet of spiral coil cooling tube (7-1) is connected to the water inlet of cooler (2).