Steam exhaust device of steam turbine

Abstract

The invention provides a steam exhaust device of a steam turbine. The steam exhaust device comprises a steam exhaust device casing, wherein the steam exhaust device casing is provided with a steam inlet and a steam outlet, a steam exhaust main flow passage is formed between the steam inlet and the steam outlet, the seam inlet is connected with a steam exhaust cylinder of a low-pressure cylinder of the steam turbine, a deoxygenation spray nozzle is arranged in the steam exhaust main flow passage, and the deoxygenation spray nozzle is connected with a condensed water return pipeline of an air-cooling condenser and can spray condensed water return water of the air-cooling condenser in the steam exhaust main flow passage. The steam exhaust device of the steam turbine has the advantages that the deoxygenation spray nozzle is arranged in the steam exhaust main flow passage, the condensed water sprayed by the deoxygenation spray nozzle is in full contact with steam in the steam exhaust main flow passage, the condensed water with the supercooling degree becomes saturated condensed water after heat exchange with the steam, meanwhile, dissolved oxygen in the condensed water is dissolved out, the dissolved oxygen is exhausted along with the exhausted steam from a steam exhaust opening, and further, the dissolved oxygen quantity in the steam condensed water is reduced. According to the deoxygenation scheme, the steam turbine is adopted for exhausting steam to directly exchange heat with the condensed water, the heating effect of the supercooling condensed water is improved, and the dissolved oxygen quantity of the condensed water can be effectively reduced.

Description

technical field [0001] The invention relates to ancillary equipment of a direct air-cooled steam turbine, in particular to a steam exhaust device used on a direct air-cooled steam turbine. Background technique [0002] With the rapid development of my country's electric power industry, a large number of air-cooled power stations have been built in areas rich in coal and water-scarce in my country. Air-cooled power stations mainly use direct air-cooled steam turbines to generate electricity. Direct air-cooled steam turbine has long exhaust pipe distance, large pipe resistance, large area of ​​air-cooled condenser, and relatively large air leakage, so that the oxygen content of condensed water in air-cooled condenser seriously exceeds the standard, which will cause certain damage to equipment and pipelines. Corrosion, and the large resistance of the pipeline will increase the supercooling degree of the condensed water, which will also reduce the economy of the unit. For this ...

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Problems solved by technology

[0004] However, in actual use, since the lower left space of the exhaust device separated by the deflector is a relatively closed space, the gas circulation resistance is relatively large and the flow rate is small, which will affect the heating and deoxygenation effect of the condensed water. cause adverse effects

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