空气泄漏对汽轮机组凝汽喷射系统动态特性的影响

IF 0.9 Q4 ENERGY & FUELS
K. E. Aronson, A. Yu. Ryabchikov, D. V. Brezgin, D. Yu. Balakin, N. V. Zhelonkin, A. L. Demidov
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引用次数: 0

摘要

本文介绍了对冷凝器和新型喷射器动态特性的实验研究结果。调查是在一个热电厂进行的,在涡轮机商业运行条件下,使用一个扩展的装置来测量喷射器运行参数和一个自动数据采集系统。得到了喷射器一级吸入压力与干(大气)空气流量的关系,以及冷凝器和喷射器一级接收室压力与蒸汽-空气混合流量的关系。提出用最小斜率系数作为空气流量的函数来确定喷射器在干燥空气上的最大容积吞吐量。随着汽轮机组真空室空气泄漏量的增加,喷射器吸力处初始泄漏点和总泄漏点的压差按线性规律变化,冷凝器的压差按指数规律变化。利用该测量系统,测定了冷凝器和喷射器的动态特性。已经发现,随着进入冷凝器的空气量的增加,喷射器吸力处的压力增长率也增加。压力趋于稳定所需的时间大致保持不变。然而,冷凝器内的压力增长速度并不取决于进气量,压力稳定所需的时间随着进气量的增加呈指数增长。在诊断控制汽轮机组运行模式的真空系统故障时,建议在汽轮机控制板上提供引射器吸力压力的指示。至于压力传感器,建议安装在向喷射器提供蒸汽-空气混合物的公共管道上。汽轮机真空保护是汽轮机保护系统的重要组成部分之一,对该系统动态特性的研究将为改进汽轮机真空保护提供可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Influence of Air Inleakages on the Dynamic Characteristics of the Steam Turbine Unit Condenser‒Ejector System

The Influence of Air Inleakages on the Dynamic Characteristics of the Steam Turbine Unit Condenser‒Ejector System

The results obtained from experimental investigations of the dynamic characteristics of a condenser and new ejector are presented. The investigations were carried out at a thermal power plant under the turbine commercial operation conditions using an extended arrangement for measuring the ejector operation parameters and an automated data-acquisition system. The dependences of the ejector’s first stage suction pressure on the dry (atmospheric) air flowrate and the pressure in the condenser and in the ejector’s first stage receiving chamber on the steam–air mixture flowrate during their joint operation are obtained. It is proposed to determine the maximal volumetric throughput of the ejector operating on dry air with using the minimal slope factor as a function of the air flowrate. With an increase of air inleakages into the steam turbine unit vacuum chamber, the pressure difference at the initial and total air inleakages at the ejector suction varies according to a linear law and that in the condenser according to an exponential law. By using the measurement system, the condenser’s and ejector’s dynamic characteristics were determined. It has been found that the pressure growth rate at the ejector suction increases with increasing the amount of air admitted into the condenser. The time taken for the pressure to become stable remains approximately the same. However, the pressure growth rate in the condenser does not depend on the amount of air admitted, and the time taken for the pressure to become stable increases exponentially with increasing the amount of air admitted. For diagnosing the vacuum system malfunctions in controlling the steam turbine unit’s operation mode, it is recommended to provide indication of the ejector suction pressure on the turbine control board. As regards the pressure sensor, it is proposed to install it on the common pipeline supplying steam–air mixture to the ejectors. The investigation of the condenser–ejector system dynamic characteristics will make it possible to improve the turbine vacuum protection, which is one of the turbine protection system components.

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来源期刊
CiteScore
1.30
自引率
20.00%
发文量
94
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