Condenser throat flow field optimizing device

Abstract

The utility model discloses a condenser throat flow field optimizing device which comprises a condenser throat body in a quadrangular frustum pyramid shape, a low-pressure heater, a steam exhaust inlet of a water feeding pump turbine and a flow guiding device. The flow guide device comprises a combined flow guide device and a third flow guide device, the combined flow guide device comprises a first flow guide device and a second flow guide device, the low-pressure heater and the flow guide devices are arranged in the quadrangular frustum pyramid-shaped condenser throat body, and the upper side of the quadrangular frustum pyramid-shaped condenser throat body is provided with an inlet section connected with a steam turbine low-pressure cylinder steam exhaust port. The lower side of the condenser throat body is provided with an outlet section and connected with a condenser shell, the first flow guide device is arranged near a steam exhaust inlet of a water feeding pump turbine, the second flow guide device is arranged on one side of a low-pressure heater, and the third flow guide devices are arranged at the four corners of the condenser throat body in the shape of a quadrangular frustum pyramid. The condenser throat has the advantages that uniformity of a flow field of an outlet of the condenser throat body is enhanced, the heat exchange effect of a main condensing area of the condenser is improved, and the operation vacuum degree of the condenser is improved.

Description

Technical Field

[0001] This utility model relates to the field of wet-cooled coal-fired power plant technology, specifically to a condenser throat flow field optimization device. Background Technology

[0002] The condenser is a crucial component of a steam turbine unit, and its operational quality directly impacts the unit's economy and safety. The condenser inlet flow field, in particular, significantly influences condenser performance. In actual operation, on the one hand, the high-speed steam exiting the turbine's last stage undergoes a 90° tumble in the exhaust cylinder before entering the condenser throat. The resulting vortex structure not only causes energy loss and leads to uneven flow field distribution, but also, as the high-speed steam flows through the condenser throat, it encounters resistance from low-pressure heaters, extraction pipes, and bypass steam desuperheating and pressure-reducing devices located there, further disrupting the flow field and resulting in uneven flow at the condenser inlet. The exhaust steam velocity in the peripheral region is much higher than in the internal region, generating low-speed vortices in the internal area. This uneven flow field distribution at the condenser inlet leads to uneven heat load distribution in the condenser's cold heat exchange tube bundles, reducing the condenser's heat transfer efficiency and affecting its operational performance. Therefore, there is an urgent need for a condenser throat flow field optimization device to overcome the shortcomings of the existing technology. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a condenser throat flow field optimization device, which can improve the uniformity of the flow field distribution at the condenser throat outlet, so that the heat exchange capacity of the condenser heat exchange tube bundle can be better utilized, thereby improving the condenser vacuum.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0005] A condenser throat flow field optimization device includes a truncated quadrangular condenser throat body, a low-pressure heater, a feedwater pump turbine exhaust inlet, and a flow guiding device. The truncated quadrangular condenser throat body houses the low-pressure heater and the flow guiding device. It has an inlet section on the upper side, connected to the exhaust port of the turbine's low-pressure cylinder, and an outlet section on the lower side, connected to the condenser shell. The flow guiding device comprises a combined flow guiding device and a third flow guiding device. The combined flow guiding device includes a first flow guiding device and a second flow guiding device. The first flow guiding device is located near the feedwater pump turbine exhaust inlet, the second flow guiding device is located on one side of the low-pressure heater, and the third flow guiding device is located at the four corners of the truncated quadrangular condenser throat body, symmetrically arranged on the vertical plane containing the central axis of the low-pressure heater.

[0006] Furthermore, the third flow guiding device has an arc-shaped flow guiding structure, characterized in that the upper arc edge of the arc-shaped flow guiding structure is tangent to the vertical direction, with a width of 0.5m-1m and an arc length of 1m.

[0007] Furthermore, the second flow guiding device can be one or two sets, with a width of 6.6m-7m, an arc length of 1.4m-1.6m, and an arc angle of 20°-30°.

[0008] Furthermore, the first flow guiding device has an arc-shaped flow guiding structure with a width of 2.0m-2.2m, an arc length of 2.8m-3.3m, and an arc angle of 70°-80°.

[0009] The beneficial effects of this utility model are as follows: By arranging a flow guiding device in the throat of the condenser, the exhaust steam flow from the low-pressure cylinder of the turbine and the exhaust steam from the feedwater pump turbine are guided to the low-speed region in the middle of the outlet of the condenser throat through the flow guiding device, thereby reducing eddies in the flow field and increasing the uniformity of the flow field, thus improving the heat exchange capacity of the condenser tube bundle and increasing the vacuum of the condenser. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0011] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0012] Figure 2 yes Figure 1 The main view.

[0013] Figure 3 yes Figure 1 Side view.

[0014] Explanation of markings in the diagram:

[0015] 1-The main body of the condenser throat in the shape of a truncated quadrangular pyramid; 2-Low-pressure heater; 3-Steam exhaust inlet of the feedwater pump turbine; 4-Flow guiding device; 41-Third flow guiding device; 42-Combined flow guiding device; 421-Second flow guiding device; 422-First flow guiding device; 5-Condenser throat outlet section; 6-Condenser throat inlet section. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] A condenser throat flow field optimization device, such as Figure 1As shown, the condenser includes a truncated quadrangular condenser throat body 1, a low-pressure heater 2, a feedwater pump turbine exhaust inlet 3, and a flow guiding device 4. The truncated quadrangular condenser throat body 1 houses the low-pressure heater 2 and the flow guiding device 4. An inlet section 6 is provided on the upper side, connecting to the exhaust port of the turbine's low-pressure cylinder. An outlet section 5 is provided on the lower side, connecting to the condenser shell. The flow guiding device 4 comprises a combined flow guiding device 42 and a third flow guiding device 41. The combined flow guiding device 42 includes a first flow guiding device 422 and a second flow guiding device 421. The first flow guiding device 422 is located near the feedwater pump turbine exhaust inlet 3, the second flow guiding device 421 is located on one side of the low-pressure heater 2, and the third flow guiding device 41 is located at the four corners of the truncated quadrangular condenser throat body 1, and is symmetrically arranged on the vertical plane containing the central axis of the low-pressure heater 2.

[0018] The third flow guiding device 41 has an arc-shaped flow guiding structure. The upper arc edge of the arc-shaped flow guiding structure is tangent to the vertical direction, with a width of 0.5m-1m and an arc length of 1m.

[0019] The arc of the second flow guiding device 421 is tangent to the vertical direction at the midpoint, with a width of 6.6m-7m, an arc length of 1.4m-1.6m, and an arc angle of 20°-30°.

[0020] The upper edge of the arc of the first flow guiding device 422 is tangent to the vertical direction, with a width of 2.0m-2.2m, an arc length of 2.8m-3.3m, and an arc angle of 70°-90°.

[0021] Furthermore, the shape of the flow guiding device 4 can be a curved structure, a combination of multiple curved panels, or a combination of multiple flat panels.

[0022] The third flow guiding device 41 guides the high-speed airflow from the outer end wall of the condenser throat to the region with lower steam velocity in the middle of the throat outlet. The second flow guiding device 421 straightens the turbine's final-stage exhaust steam flow flowing downwards within the truncated quadrangular condenser throat body 1, guiding a portion of the turbine's final-stage exhaust steam flow to the low-speed region below the low-pressure heater 2. The first flow guiding device 422 guides a portion of the feedwater pump turbine exhaust steam flow downwards towards the feedwater pump turbine exhaust inlet 3, reducing the generation of a low-speed vortex region below the feedwater pump turbine exhaust inlet 3 and weakening the impact of the feedwater pump turbine exhaust steam on the turbine exhaust steam. All flow guiding devices reduce the low-speed vortex region at the condenser throat outlet, increase the uniformity of the outlet flow field, and improve the heat exchange capacity of the condenser condensing tube bundle.

[0023] In summary, by utilizing the above-mentioned technical solution of this utility model, the exhaust steam flow from the low-pressure cylinder of the steam turbine and the exhaust steam from the feedwater pump turbine are guided through the guide device to the low-speed region in the middle of the condenser throat outlet. This reduces eddies in the flow field, increases the uniformity of the flow field, thereby improving the heat exchange capacity of the condenser tube bundle and increasing the vacuum of the condenser.

[0024] The above embodiments are not intended to limit the present invention. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention shall also fall within the protection scope of the present invention.

Claims

1. A condenser throat flow field optimization device, comprising a truncated quadrangular condenser throat body (1), a low-pressure heater (2), a feedwater pump turbine exhaust inlet (3), and a flow guiding device (4), characterized in that, The truncated quadrangular condenser throat body (1) is equipped with a low-pressure heater (2) and a flow guiding device (4). The upper side is provided with an inlet section (6), which is connected to the exhaust port of the low-pressure cylinder of the steam turbine. The lower side is provided with an outlet section (5), which is connected to the condenser shell. The flow guiding device (4) includes a combined flow guiding device (42) and a third flow guiding device (41). The combined flow guiding device (42) includes a first flow guiding device (422) and a second flow guiding device (421). The first flow guiding device (422) is arranged near the exhaust port (3) of the feedwater pump steam turbine. The second flow guiding device (421) is arranged on one side of the low-pressure heater (2). The third flow guiding device (41) is arranged at the four corners of the truncated quadrangular condenser throat body (1) and is symmetrically arranged on the vertical plane where the central axis of the low-pressure heater (2) is located.

2. The condenser throat flow field optimization device according to claim 1, characterized in that, The third flow guiding device (41) has an arc-shaped flow guiding structure. The upper arc edge of the arc-shaped flow guiding structure is tangent to the vertical direction, with a width of 0.5m-1m, an arc length of 1-1.5m, and an arc angle of 50°-60°.

3. The condenser throat flow field optimization device according to claim 1, characterized in that, The second flow guiding device (421) can be one or two sets, with a width of 6.6m-7m, an arc length of 1.4m-1.6m, and an arc angle of 20°-30°.

4. The condenser throat flow field optimization device according to claim 1, characterized in that, The first flow guiding device (422) has an arc-shaped flow guiding structure with a width of 2.0m-2.2m, an arc length of 2.8m-3.3m, and an arc angle of 70°-80°.

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