Automatic drainage system for high-temperature and high-pressure steam pipeline

Abstract

The invention discloses an automatic drainage method for a high-temperature and high-pressure steam pipeline, which comprises the following steps: acquiring a temperature parameter T0 of a temperature measuring element in a drainage tank, and acquiring a pressure parameter P of steam above the temperature measuring element; the control system obtains the saturated steam temperature T1 through conversion according to the pressure parameter P and judges whether to control the electric valve to be opened or not according to the formula T = T1-T0, specifically, (i) when T is larger than 0 DEG C, the electric valve is opened to drain water; (ii) when T is less than 0 DEG C, closing the electric valve after t seconds, and stopping draining; and (iii) when either (i) or (ii) is not established, continuously opening the electric valve to drain water or increasing water drainage. According to the invention, a set of universal automatic drainage system is designed by utilizing the physical characteristics of water, namely the corresponding relation between saturation temperature and pressure, the system can be used for various working conditions from low pressure to subcritical and from low temperature to high temperature, and the defects of existing product schemes such as an automatic drainage valve, a liquid level switch and a differential pressure liquid level meter are completely eradicated.

Description

technical field [0001] The invention relates to the technical field of steam pipeline drainage devices, in particular to an automatic drainage device for high-temperature and high-pressure steam pipelines, a drainage method, and a drainage system. Background technique [0002] During the cold start-up process of the steam pipeline, a large amount of condensed water will be generated. If the condensed water is not discharged in time, it will enter the next link with the steam. If the downstream is a high-temperature superheater, the condensed water will cause uneven heating of the heating surface and reduce the service life; if the downstream is a steam turbine, the condensed water will damage the turbine blades. [0003] At present, a drain device is generally installed on the steam pipeline. The function of the drain device is to open the drain valve to drain water when the water level of the condensed water reaches the set height; when the water level is low, the drain val...

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Problems solved by technology

[0004] Existing drainage solutions include: 1. Automatic drain valve: complex structure, short life, poor reliability; 2. Liquid level switch: cannot be used in high temperature and high pressure conditions due to structural materials; 3. Differential pressure level gauge: pressure point The height difference requirements are large and the structure requirements are harsh, so it cannot be used in places with limited space

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