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Direct air-cooling steam condensation system and control method thereof for extracting non-condensable gas

A control method, a straightforward technique, applied to the condensation of spent steam. It can solve the problems of prone to freezing accidents, hindering the flow of steam, and uneven steam, so as to avoid the accumulation of non-condensable gases, improve heat exchange efficiency, and facilitate safe operation.

Pending Publication Date: 2019-12-06
SHUANGLIANG ECO ENERGY SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing direct air-cooled steam system does not control the non-condensable gas extraction process. When the number of condensing units is large, there are the following disadvantages: 1) Due to the high steam flow rate, the steam distributed to each condensing unit through the exhaust pipe is uneven, The heat load of each condensing unit is inconsistent, which affects the overall heat exchange efficiency; 2) When the steam pressure (steam turbine back pressure) is low, the extraction pressure of each condensing unit’s extraction branch pipe is also different, and some condensing units have a small extraction volume. Non-condensable gas accumulates in the counter-flow tube bank or even in the downstream tube bank, forming a "dead zone" that hinders the flow of steam, which not only has low heat transfer efficiency, but also is prone to freezing accidents in winter

Method used

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  • Direct air-cooling steam condensation system and control method thereof for extracting non-condensable gas
  • Direct air-cooling steam condensation system and control method thereof for extracting non-condensable gas

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0022] see figure 1 , a direct air-cooled steam system, consisting of an exhaust pipe 9, an air extraction pipe 8, a condensed water pipe 7, a controller 13 and a plurality of condensing units, each condensing unit includes: an exhaust branch pipe 6, a downstream tube bundle 1. The lower header of the tube bundle 2, the countercurrent tube bundle 3, the upper header of the tube bundle 4 and the air extraction branch pipe 5; add a temperature sensor 10 on the air extraction branch pipe 5 of each condensing unit or on the upper header 4 of the tube bundle ( figure 1 The position of the temperature sensor 10 shown in is on the air extraction branch pipe 5, and can also be arranged on the upper header 4 of the tube bundle); an air extraction regulating valve 12 is added on the air extraction branch pipe 5 of each condensing unit; the temperature sensor 10 is passed through The data transmission channel 14 is connected with the controller 13 , and the suction regulating valve 12 is...

Embodiment 2

[0029] see figure 2 , a direct air-cooled steam system, consisting of an exhaust pipe 9, an air extraction pipe 8, a condensed water pipe 7, a controller 13 and a plurality of condensing units, each condensing unit includes: an exhaust branch pipe 6, a downstream tube bundle 1. The lower header of the tube bundle 2, the countercurrent tube bundle 3, the upper header of the tube bundle 4 and the air extraction branch pipe 5, add a temperature sensor 10 on the air extraction branch pipe 5 of the condensing unit or on the upper header 4 of the tube bundle (shown in the figure The position of the temperature sensor 10 is on the exhaust branch pipe 5), and the steam inlet regulating valve 11 is added on the exhaust branch pipe 6 of the condensing unit, the temperature sensor 10 is connected with the controller 13 through the data transmission channel 14, and the steam inlet regulating valve 11 is also It is connected with the controller 13 through the data transmission channel 14 ...

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Abstract

The invention relates to a direct air-cooling steam condensation system. The direct air-cooling steam condensation system is composed of a steam exhaust pipeline, a gas extraction pipeline, a condensed water pipeline, a controller and a plurality of condensation units, wherein a temperature sensor is arranged on a branch gas extraction pipeline of each condensation unit; a gas extraction adjustment valve is arranged on each branch gas extraction pipeline, or, a steam inlet adjustment valve is arranged on a branch steam exhaust pipeline; and gas extraction amounts or steam inlet amounts of thecondensation units are adjusted according to a detected gas extraction temperature, so that the purpose of adjusting and balancing extraction amounts for the non-condensable gas in the condensation units is realized. According to the direct air-cooling steam condensation system, the heat exchange efficiency of the steam condensation system is increased, winter anti-freezing is benefited, and the safety of the system is improved.

Description

technical field [0001] The invention relates to a direct air-cooled steam system and a control method for extracting non-condensable gas, which are used for exhaust steam condensation of steam turbines in thermal power plants or similar steam-driven equipment. Background technique [0002] In the process of thermal power generation, exhaust steam (steam) discharged from the low-pressure cylinder of the steam turbine needs to be condensed into water and then returned to the boiler for recycling. In order to save water resources, many power plants use direct air-cooled steam systems to condense exhausted steam. [0003] At present, the direct air-cooled steam system consists of exhaust pipes, extraction pipes, condensate pipes, controllers and condensing units. The condensing unit includes exhaust branch pipes, downstream tube bundles, tube bundle lower headers, countercurrent tube bundles, tube bundle upper headers, extraction branch pipes, etc. The exhaust steam discharged...

Claims

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Application Information

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IPC IPC(8): F28B7/00F28B9/10F28B11/00
CPCF28B7/00F28B9/10F28B11/00
Inventor 薛海君
Owner SHUANGLIANG ECO ENERGY SYST CO LTD