Annular water spraying device of rear cylinder of steam turbine

Abstract

According to the technical scheme, a first branch pipe and a second branch pipe are arranged on a cooling water header pipe, a plurality of spray heads are arranged on the first branch pipe and the second branch pipe, and the spray heads penetrate through a rear cylinder panel to enter the rear cylinder. The multi-nozzle cooling device has the advantages that due to the multi-nozzle design of the device, the cooling effect is enhanced, the service life of a steam turbine cylinder is prolonged, and the cylinder is prevented from being damaged by continuous high temperature; (2) due to the design of the annular spray head, cooling water is uniformly sprayed, heat in the cylinder can be uniformly taken away, and local overheating is prevented; and (3) a temperature sensor arranged on the device is interlocked with the pneumatic valve, spraying cooling can be automatically carried out under the high-temperature condition, spraying is stopped after the temperature is reduced to the specified temperature, the automation degree is high, the labor intensity of operators is reduced, and the efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooling systems, and particularly relates to an annular water spraying device for the rear cylinder of a steam turbine. Background Art

[0002] In large unit devices, when a steam turbine starts up, operates at no load or under low load, the steam flow rate is very small and is not sufficient to carry away the heat generated by the friction between the steam and the impeller, thus causing the exhaust steam temperature to rise. At this time, the valve of the rear cylinder spraying device of the steam turbine is opened to lower the exhaust steam temperature. However, at present, single-nozzle water spraying devices are used in steam turbines, and the water spraying is uneven and cannot effectively reduce the exhaust steam temperature. Summary of the Invention

[0003] In view of the above problems in the prior art, the utility model provides an annular water spraying device for the rear cylinder of a steam turbine. The technical solution is as follows: It includes a rear cylinder panel. A first branch pipe and a second branch pipe are arranged on the cooling water main pipe. A number of nozzles are arranged on the first branch pipe and the second branch pipe, and the nozzles pass through the rear cylinder panel and enter the inside of the rear cylinder.

[0004] As a preferred solution, the first branch pipe and the second branch pipe are arc-shaped pipes and are centrosymmetric with respect to the center of the rear cylinder panel. The number of nozzles on the first branch pipe and the second branch pipe is the same and they are arranged at equal distances.

[0005] As a preferred solution, a temperature sensor is arranged on the rear cylinder panel.

[0006] As a preferred solution, a pneumatic valve is arranged on the cooling water main pipe.

[0007] As a preferred solution, the pneumatic valve is interlocked with the temperature sensor, and the opening and closing of the pneumatic valve are controlled by the temperature monitored by the temperature sensor.

[0008] Advantages of the utility model:

[0009] (1) The multi-nozzle design of the device strengthens the cooling effect, increases the service life of the steam turbine cylinder, and prevents the cylinder from being damaged by continuous high temperature;

[0010] (2) The annular nozzle design of the device enables the cooling water to be evenly sprayed, can evenly carry away the heat in the cylinder, and prevents local overheating;

[0011] (3) The temperature sensor and the pneumatic valve arranged in the device are interlocked, which can automatically perform spray cooling in high-temperature situations and stop spraying after the specified temperature is reached. The degree of automation is high, reducing the labor intensity of operators and improving efficiency. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 This is a schematic diagram of the overall structure from another perspective of the present utility model.

[0014] Figure 3 This is a schematic diagram of the structure without the rear cylinder panel of the present utility model.

[0015] In the figure: 1. Rear cylinder panel; 2. Total cooling water pipe; 3. First branch pipe; 4. Second branch pipe; 5. Sprinkler head; 6. Pneumatic valve; 7. Temperature sensor. Specific embodiments

[0016] The following further describes the present utility model in detail according to the drawings and specific embodiments.

[0017] Embodiment

[0018] As Figures 1-3 shown, a steam turbine rear cylinder annular water spraying device includes a rear cylinder panel 1, and is characterized in that a first branch pipe 3 and a second branch pipe 4 are arranged on the total cooling water pipe 2, eight sprinkler heads 5 are arranged on the first branch pipe 3 and the second branch pipe 4, and the sprinkler heads 5 pass through the rear cylinder panel 1 and enter the interior of the rear cylinder.

[0019] Furthermore, the first branch pipe 3 and the second branch pipe 4 are arc-shaped pipes and are centrosymmetric with respect to the center of the rear cylinder panel 1, and the number of sprinkler heads on the first branch pipe 3 and the second branch pipe 4 is the same and they are arranged at equal distances.

[0020] Furthermore, a temperature sensor 7 is arranged on the rear cylinder panel 1, and the temperature sensor 7 is used to monitor the temperature inside the cylinder.

[0021] Furthermore, a pneumatic valve 6 is arranged on the total cooling water pipe 2, and the pneumatic valve 6 is used to open and close the spraying of the cooling water.

[0022] Furthermore, the pneumatic valve 6 is interlocked with the temperature sensor 7, and the opening and closing of the pneumatic valve 6 are controlled by the temperature monitored by the temperature sensor 7. When the temperature inside the cylinder rises to the set temperature, the pneumatic valve 6 opens, and when the temperature inside the cylinder drops to the set temperature, the pneumatic valve 6 closes.

[0023] When the above device is adopted, its operation process is as follows: First, set the start temperature and the stop temperature in the control system. When the temperature sensor 7 monitors that the temperature inside the cylinder rises to the start temperature, the pneumatic valve 6 opens, and the cooling water cools the inside of the cylinder through the annular array of sprinkler heads 5. When the temperature sensor 7 monitors that the temperature inside the cylinder drops to the stop temperature, the pneumatic valve 6 closes and the spraying stops.

Claims

1. A steam turbine rear cylinder annular water spray device, comprising a rear cylinder panel (1), characterized in that: A first branch pipe (3) and a second branch pipe (4) are arranged on the cooling water main pipe (2), and a plurality of nozzles (5) are arranged on the first branch pipe (3) and the second branch pipe (4). The nozzles (5) pass through the rear cylinder panel (1) and enter the interior of the rear cylinder.

2. The annular water spray device for the rear cylinder of a steam turbine according to claim 1, characterized in that: The first branch pipe (3) and the second branch pipe (4) are arc-shaped pipes and are symmetrical with respect to the center of the rear cylinder panel (1); the number of nozzles on the first branch pipe (3) and the number of nozzles on the second branch pipe (4) are the same and are arranged at equal distances.

3. The annular water spray device for the rear cylinder of a steam turbine according to claim 1, characterized in that: A temperature sensor (7) is provided on the rear cylinder panel (1).

4. The annular water spray device for the rear cylinder of a steam turbine according to claim 1, characterized in that: A pneumatic valve (6) is provided on the cooling water main pipe (2).

5. The annular water spray device for the rear cylinder of a steam turbine according to claim 4, characterized in that: The pneumatic valve (6) is interlocked with the temperature sensor (7), and the opening and closing of the pneumatic valve (6) is controlled by the temperature monitored by the temperature sensor (7).

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