Air cooler for cooling steam turbine of power plant

Abstract

The utility model relates to the technical field of power plant steam turbines, in particular to an air cooler for cooling a power plant steam turbine, which comprises a steam cylinder of the steam turbine, and is characterized by comprising an air cooling box covered on the steam cylinder, a plurality of openings arranged at one end of the air cooling box, and a plurality of air outlets arranged at the other end of the air cooling box, the air inlet pipe is arranged in the opening, the fan is fixed in the air inlet pipe, the refrigeration assembly is installed on the air inlet pipe, and the air outlet end of the fan is arranged right opposite to the upper half part of the cylinder; in practical application, air is injected into the air cooling box through the fan, the entering air is refrigerated through the refrigeration assembly, and the refrigerated air is blown to the upper half part of the cylinder and then blown out of the air outlet, so that heat dissipation of the upper half part of the cylinder is accelerated, and a cylinder body is uniformly cooled; according to the utility model, the cylinder body can be uniformly cooled, the deformation of the cylinder body or the deformation of the split bolt in the cylinder caused by large temperature difference change is avoided, and the safe use of a steam turbine is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power plant steam turbines, and particularly relates to an air cooler for cooling a power plant steam turbine. Background Technique

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated air flow and then jets onto the blades, causing the rotor equipped with the blade row to rotate and doing work externally at the same time. A steam turbine is the main equipment of a modern thermal power plant and is also used in the metallurgical industry, chemical industry, and ship power plants. A cylinder is provided outside the steam turbine as a protective shell. After the steam turbine unit stops running, since a steam extraction port is provided in the lower half of the cylinder, the cooling speed of the lower half of the cylinder is greater than that of the upper half of the cylinder. Therefore, a temperature difference is generated between the upper and lower halves of the cylinder. When the temperature difference changes greatly, the cylinder body is prone to deformation or the bolts on the cylinder mid-plane are deformed, affecting the safe use of the steam turbine. Content of the Utility Model

[0003] The purpose of the utility model is to provide an air cooler for cooling a power plant steam turbine in view of the above deficiencies, which can uniformly cool the cylinder body, avoid the cylinder body from being deformed or the bolts on the cylinder mid-plane being deformed due to a large temperature difference change, and ensure the safe use of the steam turbine.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An air cooler for cooling a power plant steam turbine includes the cylinder of the steam turbine, and is characterized in that: an air cooling box covering the cylinder, a plurality of openings provided at one end of the air cooling box, a plurality of air outlets provided at the other end of the air cooling box, an air inlet pipe provided in the opening, a fan fixed in the air inlet pipe, a refrigeration component installed on the air inlet pipe, and the air outlet end of the fan is arranged facing the upper half of the cylinder.

[0006] Further, a plurality of air inlets are radially provided on the air inlet pipe; the refrigeration component includes a semiconductor refrigeration sheet fixed in the air inlets, a refrigeration ring fixed in the air inlet pipe, and a plurality of heat absorption sheets arranged in the refrigeration ring. The refrigeration end of the semiconductor refrigeration sheet faces the inside of the air inlet pipe and abuts against the outer side wall of the refrigeration ring, and the plurality of heat absorption sheets are arranged at equal angles around the axis of the air inlet pipe.

[0007] Further, a plurality of heat dissipation sheets are arranged on the outside of the air inlet pipe with the heating end of the semiconductor refrigeration sheet facing outward.

[0008] Further, a partition is provided in the air-cooled box. The partition is disposed near the air inlet pipe. The partition divides the interior of the air-cooled box into an air inlet chamber and a heat dissipation chamber in sequence from right to left. The cylinder is disposed in the heat dissipation chamber. A plurality of air holes communicating the air inlet chamber and the heat dissipation chamber are provided on the partition.

[0009] Further, the aperture of the air holes gradually decreases from right to left.

[0010] Further, it further includes a controller installed on the air-cooled box and a temperature induction sensor fixed on the cylinder. The fan, the refrigeration component and the temperature induction sensor are all electrically connected to the controller.

[0011] The beneficial effects of the present utility model are as follows:

[0012] In practical applications, air is injected into the air-cooled box through the fan, and the entering air is refrigerated by the refrigeration component. The refrigerated air blows to the upper half of the cylinder and then blows out from the air outlet, accelerating the heat dissipation of the upper half of the cylinder and enabling the cylinder block to be evenly cooled. The present utility model can evenly cool the cylinder block, avoid the situation that the cylinder block is deformed or the bolts on the cylinder middle surface are deformed due to large temperature difference changes, and ensure the safe use of the steam turbine. Description of the Drawings

[0013] Figure 1 is the overall structural schematic diagram of the present utility model;

[0014] Figure 2 is the top view of the present utility model;

[0015] Figure 3 is Figure 2 the cross-sectional view at A-A in

[0016] Figure 4 is the structural schematic diagram of the refrigeration component in the present utility model;

[0017] Reference numerals: cylinder 1; air-cooled box 2; air outlet 21; air inlet chamber 22; heat dissipation chamber 23; air inlet pipe 3; fan 4; semiconductor refrigeration sheet 51; refrigeration ring 52; heat absorption sheet 53; heat dissipation sheet 54; partition 6; air hole 61. Detailed Embodiments

[0018] Such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in the figure, an air cooler for cooling a power plant steam turbine includes a cylinder 1 of the steam turbine, and is characterized in that: an air cooling box 2 covering the cylinder 1, a plurality of openings provided at one end of the air cooling box 2, a plurality of air outlets 21 provided at the other end of the air cooling box 2, an air inlet pipe 3 provided in the opening, a fan 4 fixed in the air inlet pipe 3, a refrigeration component installed on the air inlet pipe 3, and the air outlet end of the fan 4 is arranged facing the upper half of the cylinder 1.

[0019] Air is injected into the air cooling box 2 through the fan 4, the entering air is refrigerated by the refrigeration component, the refrigerated air is blown to the upper half of the cylinder 1, and then blown out from the air outlets 21, which speeds up the heat dissipation of the upper half of the cylinder 1 and enables the cylinder body to be evenly cooled; the utility model can evenly cool the cylinder body, avoid the situation that the cylinder body is deformed due to large temperature difference changes or the bolts on the middle split surface of the cylinder 1 are deformed, and ensure the safe use of the steam turbine.

[0020] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in the figure, a plurality of air inlets are radially provided on the air inlet pipe 3; the refrigeration component includes a semiconductor refrigeration sheet 51 fixed in the air inlets, a refrigeration ring 52 fixed in the air inlet pipe 3, a plurality of heat absorption sheets 53 are arranged in the refrigeration ring 52, the refrigeration end of the semiconductor refrigeration sheet 51 faces the inside of the air inlet pipe 3 and abuts against the outer side wall of the refrigeration ring 52, and the plurality of heat absorption sheets 53 are arranged at equal angles with the axis of the air inlet pipe 3 as the center; in this embodiment, the refrigeration ring 52 is refrigerated by the refrigeration end of the semiconductor refrigeration sheet 51, the refrigeration area of the refrigeration ring 52 is increased by the plurality of heat absorption sheets 53, the air drawn in by the fan 4 is refrigerated by the refrigeration ring 52 and the heat absorption sheets 53, so that the cold air is blown to the upper half of the cylinder 1, which speeds up the heat dissipation of the upper half of the cylinder 1 and enables the cylinder body to be evenly cooled.

[0021] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in the figure, a plurality of heat dissipation fins 54 are arranged on the outside of the air inlet pipe 3 with the heating end of the semiconductor refrigeration sheet 51 facing outward; in this embodiment, the heat dissipation area of the heating end of the semiconductor refrigeration sheet 51 is increased by the plurality of heat dissipation fins 54, the heat dissipation effect is good, and the refrigeration effect of the refrigeration end is better.

[0022] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a partition 6 is provided in the air-cooled box 2. The partition 6 is disposed near the air inlet pipe 3. The partition 6 divides the interior of the air-cooled box 2 into an air inlet chamber 22 and a heat dissipation chamber 23 from right to left in sequence. The cylinder 1 is disposed in the heat dissipation chamber 23. A plurality of air holes 61 communicating the air inlet chamber 22 and the heat dissipation chamber 23 are provided on the partition 6. In this embodiment, air is introduced into the air-cooled box 2 by the fan 4, and the air holes 61 can make the incoming air more uniform, so that the cylinder 1 is evenly cooled.

[0023] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the aperture of the air hole 61 gradually decreases from right to left. In this embodiment, when the aperture of the air hole 61 gradually decreases from right to left, the air entering the air inlet chamber 22 is compressed by the air hole 61 and then sprayed onto the cylinder 1 in the heat dissipation chamber 23, and the heat dissipation effect is better.

[0024] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, it further includes a controller installed on the air-cooled box 2 and a temperature induction sensor fixed on the cylinder 1. The fan 4, the refrigeration component and the temperature induction sensor are all electrically connected to the controller. In this embodiment, when the temperature induction sensor senses that the temperature of the cylinder 1 is too high, the fan 4 and the refrigeration component automatically cool the cylinder 1.

[0025] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the scope defined by the spirit of the present invention.

Claims

1. An air cooler for cooling a steam turbine in a power plant, comprising a cylinder (1) of the steam turbine, characterized in that: An air cooling box (2) is arranged on the cylinder (1), a plurality of openings are arranged at one end of the air cooling box (2), a plurality of air outlets (21) are arranged at the other end of the air cooling box (2), an air inlet pipe (3) is arranged in the opening, a fan (4) is fixed in the air inlet pipe (3), and a refrigeration component is installed on the air inlet pipe (3), wherein the air outlet end of the fan (4) is arranged directly opposite to the upper half of the cylinder (1).

2. The air cooler for cooling a steam turbine in a power plant according to claim 1, characterized in that: The air inlet pipe (3) is radially provided with a plurality of air inlets; the refrigeration assembly comprises a semiconductor refrigeration plate (51) fixed in the air inlet, a refrigeration ring (52) fixed in the air inlet pipe (3), a plurality of heat absorbing plates (53) are arranged in the refrigeration ring (52), the refrigeration end of the semiconductor refrigeration plate (51) faces the inside of the air inlet pipe (3) and abuts against the outer wall of the refrigeration ring (52), and the plurality of heat absorbing plates (53) are arranged at equal angles with the axis of the air inlet pipe (3) as the center.

3. The air cooler for cooling a steam turbine in a power plant according to claim 2, characterized in that: The heating end of the semiconductor refrigeration sheet (51) is provided with a plurality of heat dissipation sheets (54) facing the outside of the air inlet pipe (3).

4. The air cooler for cooling a steam turbine in a power plant according to claim 1, characterized in that: A partition (6) is provided in the air cooling box (2), and the partition (6) is arranged close to the air inlet pipe (3). The partition (6) divides the interior of the air cooling box (2) into an air inlet chamber (22) and a heat dissipation chamber (23) from right to left. The cylinder (1) is arranged in the heat dissipation chamber (23), and a plurality of air holes (61) are provided on the partition (6) for connecting the air inlet chamber (22) and the heat dissipation chamber (23).

5. The air cooler for cooling a steam turbine in a power plant according to claim 4, characterized in that: The aperture of the air hole (61) gradually decreases from right to left.

6. The air cooler for cooling a steam turbine in a power plant according to claim 1, characterized in that: It also includes a controller installed on the air cooling box (2) and a temperature sensing sensor fixed on the cylinder (1), and the fan (4), the refrigeration component and the temperature sensing sensor are all electrically connected to the controller.

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