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机组运行条件    -中译英
来源:北京新语丝翻译公 司  编辑:xinyusi  发布日期: 2013-06-13 15:02


机组运行条件    翻译由新语丝北京翻译公 司资深译员整理,如果您有更多的 机械翻译,可以随时与我们的 在线客服人员联系.

机组运行条件   

1.2.1机组运行负荷模式

机组年运行小时数  为7,600小时,年利用小时 数6,000小时。

负荷 年运行小时数 年利用小时数
100%额定出力 2950 2950
75%额定出力 2900 2175
≤50%额定出力 1750 875
总计 7600 6000
 
1.2.2机组负荷性质

机组具有一定的调 峰能力,其调峰范围为40%~100%额定出力。机组应 能满足锅炉负荷为30%BMCR及以上时,机组投 入全部自动装置、锅炉不投油、全部燃煤的条件下长期安全稳定运行的要求。

1.2.3启动、并网和带负 荷

机组应满足冷态、 温态、热态和极热态等不同启动方式下参数配合的要求。卖方应提供上述不同启动方式下从启动到并网到满负荷的启动曲线,曲线中应至少包括蒸汽温度、压力、流量等,特别是从锅炉点火到汽机冲转的时间,到同步并列

的时间和负荷上升 到满负荷的时间,以供买方核算。

1.2.4汽机旁路系统

机组没有汽机旁路系统 ,允许主蒸汽能绕过高压缸,随再热冷段蒸汽管道再次进入锅炉,也允许再热器出口蒸汽绕过中压缸而流入空冷凝汽器。旁路系统的主要功能是:

1) 在冷态、温态、热 态和极热态下能启动机组,在整个启动过程中,能使汽机进口蒸汽压力、温度、流量稳步提高,满足汽轮机的要求,从而缩短机组的启动时间。

2) 在启动时,使蒸汽 通过再热器以保护再热器不被干烧。

3) 满足空冷凝汽器冬 季启动及低负荷时的防冻要求。

1.2.5给水泵配置

每台机组配置 2台50%BMCR容量的汽动给水泵 ,用于机组正常运行,另外还配置1台带液力偶合器的 30%容量的电动调速给 水泵,用于机组启动及备用。

1.2 Generator set operating conditions

1.2.1 Operating load mode

The annual operating hour of the generator set is 7,600 hours and the annual hour availability is 6,000 hours.

Load Annual operating hour Annual hour availability
100% of nominal output 2,950 2,950
75% of nominal output 2,900 2,175
≤50% of nominal output 1,750 875
Total 7,600 6,000

1.2.2 Load nature

The generator set features certain peaking capability, with peaking range between 40% and 100% of nominal output of the generator set. The generator set shall be able to operate safely and stably for long period when the boiler

load is 30% of BMCR or above, all automatic devices are put into operation, no fuel is fed to the boiler or only coal is used.

1.2.3 Startup, paralleling in, and loading on

Parameters shall be appropriately configured on the generator units so that they may be started from cool, warm, hot, and extremely hot modes. The Seller shall furnish a startup curve from each of the above statuses until the units

are paralleled in and loaded on. The curves shall include steam temperature, pressure, and flow, and etc. Especially, the durations from boiler ignition to engine startup, to paralleling in, and to the full load shall be included for the

Buyer's calculation.

1.2.4 Turbine bypass

Turbine bypass shall be available for main steam bypassing the high pressure cylinder and returning to the boiler through the cold steam pipe of the re-heater, and for the steam from the re-heater outlet bypassing the mid cylinder

and entering the condenser. Main function of the bypass is as follows:

1) Enable turbine startup in cool, warm, hot, and extremely hot statuses. Steady increase of turbine inlet steam pressure, temperature, and flow shall be available to suit the turbine and accelerate the startup.

2) Ensure steam flowing through and protect the re-heater during startup.

3) Keep the condenser from being frozen during startup and light-load running in winter days.

1.2.5 Feed pumps 

Each generator unit shall be equipped with two steam-driven feed pumps 50%BMCR for each, which shall be used in normal operation of the unit. An additional electric governing feed pump (capacity: 30%) with hydrodynamic clutch

shall be offered for unit startup and standby.

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