spx空冷说明

BAICHENG 白城 2 x 660 MW

SPX Contract No.: WG1-101-000338 Control Description (REV-0)控制描述

5 Control Function and Purpose of ACC Control System ACC控制系统的控制功能和目的

5.1 Purpose of ACC Control System ACC控制系统的目的

a.

- Providing automatic start up 提供自动开启运行 - Providing automatic shut down 提供自动关闭运行

- Providing the safe steady state operation提供安全稳定运行

- Control of the turbine exhaust steam pressure xMAG11 CP901 to the adjustable

setpoint Ps by speed variation via VFD (Variable Frequency Drives), as well as with the steam riser valves 汽轮机排汽压力xMAG11 CP901的控制对可调设置点Ps的速度变化控制由变频器和蒸汽立管阀完成。 Ps = Turbine and Bypass operation (min. approx. load 40 %) = … kPa-abs 汽机和旁路

操作(min. approx. load最小负荷大约 40%) = …kPa-abs绝对值

b.

Freezing protection of ACC by monitoring 冷凝器的防冻保护通过控制 ? ambient air temperatures, 环境空气温度

? MAG99 CT351 ? MAG99 CT352 ? MAG99 CT353

for control functions the 2 of 3 measurement is used:MAG99 CT901 对于控制功能，使用3选2测量：MAG99 CT901

? Air extraction temperatures and Condensate temperatures抽真空温度和凝结水温度

Air extraction temperatures Condensate temperatures Street 列 Street Street Street Street Street Street Street Street 1 2 3 4 5 6 7 8 抽真空温度 xMAJ12/14 CT351,-CT352 xMAJ22/24 CT351,-CT352 xMAJ32/34 CT351,-CT352 xMAJ42/44 CT351,-CT352 xMAJ52/54 CT351,-CT352 xMAJ62/64 CT351,-CT352 xMAJ72/74 CT351,-CT352 xMAJ82/84 CT351,-CT352

凝结水温度 xMAG10/11/15/16 CT351 xMAG20/21/25/26 CT351 xMAG30/31/35/36 CT351 xMAG40/41/45/46 CT351 xMAG40/41/45/46 CT352 xMAG40/41/45/46 CT353 xMAG50/51/55/56 CT351 xMAG60/61/65/66 CT351 xMAG70/71/65/66 CT351 xMAG80/81/85/86 CT351 Ref. No.: D3501_DES6401 186201922.doc, REV-0

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BAICHENG 白城 2 x 660 MW

SPX Contract No.: WG1-101-000338 Control Description (REV-0)控制描述

c.

with automatic control of individual fans disconnection when temperatures are too low in connection with low ambient air temperature.如果有必要，当温度太低时，风扇速度控制系统会自动控制各台风机的关停。

Switch on / off of watering pumps for evacuation 抽真空泵的开启和关闭 ? At ACC start-up sequence, 用于空冷启动程序

? At ACC shut down sequence用于空冷停止程序 ? Change-over from operating waterring pump to

stand-by vacuum pumps in case of malfunction. 一旦故障产生，可将运行中的真空泵（水环泵）变成备用泵。

5.2 Main Software Components of Control System 控制系统的主要软件构成

The following subgroup control (SGC), subloop controls (SLCs), closed loop controls (CLCs) and automatic unit switches (USs) shall be implemented:

应该实行下列分组控制（SGC）、子回路控制（SLCs）、闭路循环控制(CLCs)和自动装置开关（USs）：

– SGC ? ACC Start up / Shut down ACC启动/关闭 – SLC, US ? Evacuation Unit用于抽空单元 – CLC, SLC ? Fan Control用于风机控制

– SLC ? Riser / Condensate Valve Control立管/凝结水阀

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BAICHENG 白城 2 x 660 MW

SPX Contract No.: WG1-101-000338 Control Description (REV-0)控制描述

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BAICHENG 白城 2 x 660 MW

SPX Contract No.: WG1-101-000338 Control Description (REV-0)控制描述

6 Start-Up \System” 启动\ystem”

Before starting the ACC system, the Power Plant DCS must set the following systems auto operation with a signal exchange to the ACC relevant DCS Function Groups启动空冷系统前，电厂DCS必须设定带有与ACC DCS系相关功能组的信号交换下列自动操作系统:

? The condensate (LCA/LCB) and the turbine exhaust box system must be OK and set

in AUTO mode (beyond SPX supply and engineering responsibility) 凝结水(LCA/LCB)和汽机排汽箱系统必须OK并且设定为自动模式(不在SPX供货及工程服务责任之内) ? Vacuum breaker is closed. All seal water lines are opened. The Power Plant might

not possess any vacuum breaker valve, to be checked beyond SPX真空破坏阀关闭.所有的密封水管线开启。电厂也许并为配备任何真空破坏阀，SPX 不负责检查。 ? The gland steam system (KKS: MAW) of the steam turbine is in proper operation

(gland steam pressure and temperature are HIGHER than relevant limits, beyond SPX supply and engineering responsibility) 蒸汽轮机中轴封蒸汽系统(KKS: MAW)正常运行（轴封蒸汽压力和温度高于有关界限，不在SPX供货及工程服务责任之内） ? The Steam Turbine bypass valve is in CLOSED position until the specified exhaust

steam pressure relevant to \Pre-evacuation\ signal attained(see Chapter 9.1.2.1.).汽机旁通阀关闭直到获得与指定的蒸汽压力有关的 “建立真空”信号（参照章节9.1.2.1） ? The evacuation system must be prepared include the cooling for the waterring pumps

has to be provided (beyond SPX supply and engineering responsibility) 准备抽真空系统时，水环泵必须冷却(不在SPX供货及工程服务责任之内) ? No fault signal exists on gearbox heating power supply (in winter time only)齿轮箱上的

加热电源没有错误信号（仅在冬季时间）

The ACC Function Groups will put the following systems into AUTO mode ACC功能组将对下列系统采用自动模式:

Before the SGC “ACC System” is started, the various function systems must be switched to automatic mode. 在SGC “ACC - System”启动之前，所有不同自动控制系统必须切到自动控制。

The ACC-System will be started by a signal from the Plant's. ACC 系统将由来自电厂的DCS 信号启动。

With the start of SGC “ACC- System” the subgroup controls will switch on step by step, which will run the ACC, in accordance with the following listing随着SGC “ACC - System” 启动，子组控制根据下列清单一步步开启子回路控制： :

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