0100-77037 汽轮机安全监测TSI系统

Description

0100-77037 汽轮机安全监测TSI系统

汽轮机监控仪表(TSI)系统对汽轮机转速、轴向位移、高低压缸相对膨胀、偏心、绝对膨胀、轴承振动、轴瓦振动等重要汽轮机参数进行监测和测量。当测量值达到设定的报警值时，发出报警信号警告操作人员。当达到设定的危险动作值时，输出控制信号送ETS涡轮紧急中断系统(发动机温度开关)跳闸。同时，TSI系统还可以将现场采集到的监测信号通过其信号缓冲输出接口发送给TDM水轮机振动分析系统，实现异常报警、故障诊断、故障查询、计算分析等功能。因此，TSI系统的重要性不言而喻。

一、概述
目前国内三大汽轮厂，生产660MW及以上汽轮发电机组，TSI系统一般都是进口的，以德国epro、美国Bentley (BENTLY NEVADA)、瑞士Vibro-Meter三种设备最为常见。TSI系统由相应的涡轮自动化控制公司根据具体的测量参数范围进行配置。但是，由于技术标准的实施与电厂实施的不一致，系统配置普遍违反了《国家能源安全[2014]161国家能源局关于防止电力生产事故的二十五条重点要求》、《DL/T-261火电厂热力自动化系统可靠性评价导则》，存在安全隐患。降低了热力设备的可靠性，为发电机组的安全稳定运行埋下了隐患。下面以某电厂660MW超临界机组TSI系统配置为例，谈谈认识和看法。

2. 系统配置
汽轮机为国内某公司生产的CLNZK660-24.2/566/566超临界、1中间再热、3缸4排汽、直接空凝式汽轮机。机组采用高、中压、恒压、定滑联合启动方式。TSI系统采用美国宾利公司生产的3500监控系统。该系统的设计由其下属的自动化控制公司完成。系统配置2个3500/05仪表框，每个仪表框配置2个冗余3500/15电源模块。为机架内所有监控模块和外部传感器、前驱提供工作电源，满足机架内所有负载需求。每台仪器机架配有一个机架接口模块3500/22，该模块必须安装在机架的第一个槽位(靠近电源)。每个仪表框架配置一个通信网关模块3500/92，通过以太网TCP/IP和串行(RS232/RS422/RS485)通信协议，与DCS分散控制系统进行数据通信，将各框架的监测数据和状态与过程控制等自动化系统集成。除上述基本模块外，系统设计的具体监控功能模块配置如下:
1、系统配置两个键相模块3500/25，每个键相模块接收一个涡流传感器输入信号，并将该信号转换为数字键相信号。一张卡的关键相位输出信号发送到偏心监测模块作为偏心测量系统的参考，另一张卡的关键信号输出用于发送燃气功率角测量系统。
2、系统配备5个大轴相对振动检测仪模块3500/42M，每个模块有4个输入通道，用于测量1~ 9号汽轮发电机轴的X、Y方向振动并输出运行停机。在具体通道分布中，#1长轴X、Y方向、#2长轴X、Y方向振动分布在一张卡上，#3长轴X、Y方向、#4长轴X、Y方向振动分布在一张卡上，依次类推，振动保护采用单点保护、单继电器输出。
3、系统配备3个绝对轴承振动检测模块3500/42M，用于测量#1~#9汽轮发电机轴承盖的振动。在具体通道分布中，#1、#2、#3、#4汽轮发电机轴承盖振动分布在一个卡钳上，#5、#6、#7、#8汽轮发电机轴承盖振动分布在一个卡钳上，#9汽轮发电机轴承盖振动是一个单独的卡钳，报警输出采用单点报警，单继电器输出，无停机保护。
4、系统配有变速/零档sp

0100-77037

0100-77037 汽轮机安全监测TSI系统

Turbine Supervisory Instrumentation (TSI) system monitors and measures turbine speed, axial displacement, relative expansion of high and low pressure cylinder, eccentricity, absolute expansion, bearing vibration, bearing cap vibration and other important turbine parameters. When the measured value reaches the set alarm value, an alarm signal is issued to warn the operator. When the set dangerous action value is reached, the output control signal is sent to the ETS turbine emergency interrupting system (Engine Temperature Switch) for tripping. At the same time, the TSI system can also send the monitoring signal collected on site to the TDM turbine vibration analysis system through its signal buffer output interface to achieve abnormal alarm, fault diagnosis, fault query, calculation and analysis, etc. Therefore, the importance of the TSI system is self-evident.

I. Overview
At present, the three major domestic steam turbine plants, the production of 660MW and above turbine generator units, TSI system is generally imported, with Germany epro, the United States Bentley (BENTLY NEVADA), Switzerland Vibro-Meter three equipment is the most common. The TSI system is configured by the respective turbine automation control company according to the specific range of measurement parameters. However, due to the inconsistency between the implementation of the technical standards and the implementation of the power plant, the system configuration is generally in violation of the “National Energy Safety [2014]161 State Energy Administration to prevent power production accidents of the twenty-five key requirements”, “DL/T-261 thermal Power Plant thermal automation system Reliability Evaluation Guidelines”, safety hazards. The reliability of thermal equipment is reduced, and hidden dangers are laid for the safe and stable operation of the generator set. The following takes the TSI system configuration of a 660MW supercritical unit in a plant as an example to talk about understanding and views.

2. System configuration
The steam turbine is CLNZK660-24.2/566/566 supercritical, one intermediate reheating, three cylinder and four exhaust steam, direct air condensing steam turbine manufactured by a domestic company. The unit adopts the combined starting mode of high and middle pressure, constant pressure and fixed-sliding operation mode. The TSI system uses the 3500 monitoring system produced by Bentley, USA. The design of the system is completed by its subsidiary automation control company. The system is configured with two 3500/05 instrument frames, and each instrument frame is configured with two redundant 3500/15 power modules. Provide working power for all monitoring modules and external sensors and precursors within the frame to meet all load requirements within the frame. Each instrument frame is equipped with a frame interface module 3500/22, in particular, the module must be placed in the first slot in the frame (next to the power supply). Each instrument frame is configured with a communication gateway module 3500/92, which integrates the monitoring data and status of all frameworks with process control and other automation systems through Ethernet TCP/IP and serial (RS232/RS422/RS485) communication protocols, such as data communication with DCS decentralized control system. In addition to the above basic modules, the specific monitoring function module of the system design is configured as follows:
1, the system is configured with two key phase module 3500/25, each key phase module receives one eddy current sensor input signal, and converts this signal to digital key phase signal. The key phase output signal of one card is sent to the eccentricity monitoring module as the reference of the eccentricity measurement system, and the key signal output of the other card is used to send the gas power Angle measurement system.
2, the system is equipped with 5 large shaft relative vibration detector modules 3500/42M, each module has 4 input channels, used to measure the X and Y direction vibration of the #1~#9 turbogenerator shaft and output the operation stop. In the specific channel distribution, the #1 major axis X, Y direction, #2 major axis X, Y direction vibration distribution on a card, #3 major axis X, Y direction, #4 major axis X, Y direction vibration distribution on a card, and so on, vibration protection using a single point protection, single relay output.
3, the system is equipped with 3 pieces of absolute bearing vibration detector module 3500/42M, used to measure the vibration of #1~#9 turbogenerator bearing cover. In the specific channel distribution, the #1, #2, #3, #4 turbo generator bearing cover vibration is distributed on a clamp, #5, #6, #7, #8 turbo generator bearing cover vibration is distributed on a clamp, #9 turbo generator bearing cover vibration is a separate clamp, the alarm output adopts a single point alarm, single relay output, no stop protection.
4, the system is equipped with a speed/zero sp