电极蒸汽锅炉系统安装使用维护说明

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1、WORD文档下载可编辑辅助锅炉房电锅炉项目 系统安装使用维护说明备注：阶段设计础 1出版日期2011-08-28ZANDER &INGESTRO 初包含项目设计说明文件审核图纸或图标0批准文件状态CFC总数CAD管理版次0递交文件号HYG-MB20-V7-YZDI024递交文件号HYG-MB20-V7-YZDI014资料名称系统说明版 次日期设计审核批准CAD管理备注02011.08.28系统说明Table of Content 目录1 Functions of the System 系统功能 61.1 Safety classified functions安全分类功能 61.2 Operat

2、ional Functions运行功能 62 General Description of the System 系统般说明 72.1 System系统72.1.1 Feed water System (QHG)给水系统 72.1.2Evaporation System (QHA)汽化系统 72.1.3Blow down System (QHE) 排污系统 92.1.4Chemical Dosing System (QCC, QCF)化学加药系统 .92.1.5Sampling System (QUB) 取样系统 102.1.6 Compressed / Instrument Air Syst

3、em (QHP)压缩空气 / 仪表系统 102.2 Main Components 主要部件 112.2.1 Deaerator/Feed water tank 除氧器 / 给水箱 112.2.2 Feed water pumps 给水泵 112.2.3 Boilers 锅炉112.2.4 Circulation pumps 循环泵 122.2.5 Make-up water pumps 补水泵 122.2.6 Blow down tank 排污罐123 Operation of the system系统运行 133.1 Normal system operating conditions系统

4、正常运行工况 133.2 Abnormal system operating conditions 系统异常运行工况 143.3 Normal plant operating conditions电站正常运行工况 153.4 Abnormal plant operating conditions电站异常运行工况 153.4.1 Effects on the ASGS at failure or malfunctions in associated systems因 ASG故障或辅助系统154 System Design 系统设计164.1 General Design Basis 总体设计基础

5、 164.1.1 Codes and Standards 规范和标准 164.1.2 Safety Classification 安全等级 164.1.3 Safety related design criteria相关安全设计标准 164.1.4 Protection against Internal Hazards内部危害防护 164.1.5 Protection against external hazards夕卜部危害防护 174.1.6 Ambient conditions环境条件 174.2 Component Design Basis 部件设计基础 174.3 Installat

6、ion 安装184.4 Materials 材料184.5 Electrical and Control Equipment 电气和控制设备 184.5.1 Automatic Control and On/Off Functions自动控制和开关功能 194.5.1.1 Boiler 锅炉：194.5.1.1.14.5.1.1.24.5.1.1.34.5.1.1.44.5.1.1.54.5.1.1.64.5.1.1.74.5.1.1.84.5.1.1.94.5.1.1.10Start & stop sequences 启停顺序 19Pressure, power and level cont

7、rol of boiler锅炉的压力 20Circulation pump 循环泵 21Volume control of boiler锅炉水量调节 22Feed water pump 给水泵 23Min. boiler pressure and reduced pressure最小锅炉压力和减压 23Conductivity control导电性控制 24Bottom blow down (sludge removal)锅炉底部排污(污泥清除) 25Deaerating the boiler锅炉排气 25Warm up valves steam line 蒸汽管道上的暖管阀 264.5.1.

8、1.11 Cooling the protective cage安全箱的冷去卩 264.5.1.1.12 Heating of boiler during hot standby锅炉热备用期间加热 27274.5.1.2 Feed water tank :除氧器：4.5.1.2.1 Pressure control of feed water tank除氧器压力的控制 274.5.1.2.2 Level control of feed water tank and makeup water pumps除氧器和补水泵的液面控制284.5.1.2.3 Overflow control of fee

9、d water tank除氧器的溢流控制 294.5.1.2.4 Standby operation 备用操作 294.5.1.2.5 Deaerating 排气294.5.1.3 Water treatment (Dosing):水处理(加药) 304.5.1.3.1 Hydrazine, (N2H)联氨304.5.1.3.2 Trisodium Phosphate, (crystallized 98% Na3PO4 +12H2O)磷酸三钠，(98%勺结晶 Na3PO4 +12H2O 304.5.1.3.3 Blow down tank cooling 排污罐冷去卩 314.5.2 Meas

10、urements 其他314.5.3 Alarm functions 报警功能344.5.3.1 Common for ASGS ASGS 的常见状况 374.532 Boilers 锅炉374.533 Feed water tank 除氧器 374.534 Dosing tanks 力廿药罐 374.5.4 Signal Exchange towards MCR 指向 MCR勺信号交换 394.6 Associated Systems 相关系统 495 General operational aspects般操作方面 506 Technical System Specification系统技

11、术规范 517 References 参考文献538 Appendices 附录54技术资料专业分享1.Fu nctio ns of the System系统功能描述? 1.1 peratio nal Fu nctio ns 使用功能The Auxiliary steam gen erat ing system (QH), by means of two medium voltage electrode boilers, supplies steam to the auxiliary steam system duri ng main pla nt outage, start-up and s

12、hutdow n, whe n steam from the mainsteam system, or other sources, isnot available.本辅助蒸汽系统(QH系统)采用两台中压电极锅炉在总电站运行中断、开启、停止期间，以及主蒸汽系统或其他来源的蒸汽不可用时，向辅助蒸汽系统提供蒸汽。In order to achieve the required fast startup and steam production,the system willno rmally be in sta ndby operati on, at no rmal operatio nal pr

13、essure and temperature by means of low voltage electrical elements (immersion heaters) fitted in the boilers and feed water tank.为达到快速启动和产生蒸汽要求，本系统通常会处于备用状态，维持正常操作压力和温度。这些工作将由安装在锅炉和除氧器内的380V氐压电气元件(备用加热器)完成。? 2General Description of the System系统一般说明2.1 System系统说明? 2.1.1Feed water System (QHG)锅炉给水系统(Q

14、H(系统)Make-up water, demineralized water (QHC) is fed to the feed water tank (00QHJ10 BB010) by make-up water pumps to the sprayer, which is part of the feed water tank.除氧器(00QHJ10 BB010)的补水是除盐水(QH(系统)，是由补水泵(00QHC11 AP001/00QHC12AP001和除氧器喷嘴之间的设备完成的。Excess steam/gas flows from the deaerator through a

15、pipe that conn ects with the safe ty valve s blow -off pipe. A manually shut-off valve (00QHJ10 AA002) on this pipe will be closed after when there is no filling of the tank. Two orifice plates (00QHJ10 BP003/004) is fitted to optimize the flow of the excess steam. During sta ndby operati on the val

16、ve is closed, in order to save en ergy.除氧器内的过量蒸汽及其他气体通过排气管道排出。在除氧器内充水后，此管道上的手动切断阀(00QHJ10 AA002)关闭。两个孔板(00QHJ10 BP003/004)将调整成最有利于过量蒸汽 排出的状态。为了节能，在设备备用期间此阀门将处于关闭状态。The feed water tank s water level is maintained by regulating the control valve (00QHC10 AA003) for thedemineralized makeup water to the

17、 feed water tank.Controlsignal 0-100% regulates the makeup water valve 0-100%.除盐补水在除氧器内的水位是通过调节控制阀(00QHC10 AA003)来维持的。控制信号0-100%调节补水阀0-100%。The feed water tank s pressure, and in direct its temperature, is maintained by regulati ngthe con trol valve (00QHF30 AA004) for the steam from the boilers to

18、thefeed water tank.通过调节锅炉供给除氧器蒸汽的调节阀，可保持除氧器的压力及对应的温度。The steam is lead to the bottom of the tank and passed through spreader pipes which create a circulation and thus a good mixing in the tank.除氧蒸汽通过除氧器内扩散器管道从除氧器底部进入除氧器，这样有利于蒸汽与水的充分混合。One pressure relief valve (safety valve 00QHJ10 AA010) is fitted

19、on the tank to preve nt an excess pressure in case there is a problem with the pressure con trol.除氧器安装一个安全阀(安全阀00QHJ10 AA010),用于防止压力控制出现问题时造成的超压事故。The water is pumped from the feed water tank to the respective boiler by the feed water pumps.从除氧器内出来的水再由给水泵输送到各自应流向的锅炉内。There is one pump for each boile

20、r (00QHG11 AP001 and 00QHA12 AP001). Each pump is designed for 100% of the flow.每台锅炉都配有一台给水泵(00QHG11 AP001和00QHA12 AP001)，每台泵都按100%的流量设计。The selected feed water pump is running continuously during normal operation. Ifthe selected pump fails and shuts down, the spare pump (00QHG13AP001) will automati

21、cally start. Correspondingly the on-off valve 00QHG14AA001)pens to boiler 00QHA10AC010 and on-off valve 00QHG15AA001 ope ns to boiler 00QHA20AC010.设备正常运行期间，给水泵是连续运行的。如果给水泵不能正常工作，则备用泵(00QHG13AP001会自动启动。相对应的，备用切换开关阀 00QHG14AA00为锅炉00QHA10AC010 开启，而备用切换开关阀00QHG15AA00对应锅炉00QHA20AC01开启。During standby or i

22、f the boiler pressure is below a set value the feed water control valve (00QHG11/12 AA006) is closed before a pump is started and the ope ning of the valve is reduced to a set value to remove the risk for cavitations in the pump due to high flow.在设备备用期间或当锅炉压力低于设定值时，开启另一个泵之前，给水控制阀(00QHG11/12 AA006)将关

23、闭，同时阀门的开度会调整到一个设定值，以避免给水泵带来的汽 蚀危险。During sta ndby operatio n the feed water pump fills the boiler betwee n two water volume set poin ts.设备运行期间，给水泵的给水量处于两个水量设定值之间。Each pump has a minimum flow valve (00QHG11/12/13 AA003), which secures the pumps minimum flows. The min flow valves will ope n automatica

24、llyat set pressure and thewater is pumped back to the feed water tank.给水泵有最低流量阀(00QHG11/12/13 AA003)，用于维持泵的最小流量。在设定压力下， 最低流量阀将自动开启，然后水会被泵回除氧器内。An on/off valve (00QHE16AA002), fitted below the tank, acts as overflow protection: 安装在除氧器底部的开关阀(00QHE16AA002)起到溢流的作用：If the feed water tank water level shou

25、ld reach the set high limit, this valve will open until the level is below the set value for closing the valve.如果除氧器内的水位达到了最高上限，则此开关阀会开启，直到水位低于设定值后再自动关闭。During sta ndby operatio n the feed water tank is kept warm and pressurized by two electric eleme nts (00QHJ10 AH001/AH002, 2x50% capacity), which

26、are en gaged at the set limit (on/offcontrol).To ensure the fastest possible start-up, the set limitfor warm keeping will be equal to operational temperature.设备备用期间，除氧器的保温和保压工作由两个电器元件(00QHJ10 AH001/AH002,2X50KW)完成，这两个电加热器温控运行(开关控制)。为保证最快速度的开启设备，保温的设定限制将约等同于供气温度。The feed water tank s pressure, and in

27、 direct its temperature, is maintained byregulati ngthe con trol valve (00QHF30 AA004) for the steam from the boilers to thefeed water tank.通过调节锅炉供给除氧器蒸汽的调节阀，可保持除氧器的压力及对应的温度。The steam is lead to the bottom of the tank and passed through spreader pipes which create a circulation and thus a good mixin

28、g in the tank.除氧蒸汽通过除氧器内扩散器管道从除氧器底部进入除氧器，这样有利于蒸汽与水的充分混合。One pressure relief valve (safety valve 00QHJ10 AA010) is fitted on the tank to preve nt an excess pressure in case there is a problem with the pressure con trol.除氧器安装一个安全阀(安全阀00QHJ10 AA010),用于防止压力控制出现问题时造成的超压事故。The water is pumped from the fee

29、d water tank to the respective boiler by the feed water pumps.从除氧器内出来的水再由给水泵输送到各自应流向的锅炉内。There is one pump for each boiler (00QHG11 AP001 and 00QHA12 AP001). Each pump is designed for 100% of the flow.每台锅炉都配有一台给水泵(00QHG11 AP001和00QHA12 AP001)，每台泵都按100%的流量设计。The selected feed water pump is running co

30、ntinuously during normal operation. If the selected pump fails and shuts down, the spare pump (00QHG13AP001) will automatically start.Correspondinglythe on-off valve 00QHG14AA001)pens to boiler00QHA10AC010 and on-off valve 00QHG15AA001 ope ns to boiler 00QHA20AC010.设备正常运行期间，给水泵是连续运行的。如果给水泵不能正常工作，则备用

31、泵 (00QHG13AP001会自动启动。相对应的，备用切换开关阀 00QHG14AA00为锅炉00QHA10AC010 开启，而备用切换开关阀00QHG15AA00对应锅炉00QHA20AC01开启。During standby or if the boiler pressure is below a set value the feed water control valve (00QHG11/12 AA006) is closed before a pump is started and the ope ning of the valve is reduced to a set valu

32、e to remove the risk for cavitations in the pump due to high flow.在设备备用期间或当锅炉压力低于设定值时，开启另一个泵之前，给水控制阀 (00QHG11/12 AA006)将关闭，同时阀门的开度会调整到一个设定值，以避免给水泵带来的汽 蚀危险。During sta ndby operatio n the feed water pump fills the boiler betwee n two watervolume set poin ts.设备运行期间，给水泵的给水量处于两个水量设定值之间。Each pump has a mi

33、nimum flow valve (00QHG11/12/13 AA003), which secures the pumpS minimum flows. The min flow valves will ope n automaticallyat set pressure and thewater is pumped back to the feed water tank.给水泵有最低流量阀(00QHG11/12/13 AA003)，用于维持泵的最小流量。在设定压力下， 最低流量阀将自动开启，然后水会被泵回除氧器内。An on/off valve (00QHE16AA002), fitte

34、d below the tank, acts as overflow protection: 安装在除氧器底部的开关阀(00QHE16AA002)起到溢流的作用：If the feed water tank water level should reach the set high limit, this valve will open until the level is below the set value for closing the valve.如果除氧器内的水位达到了最高上限，则此开关阀会开启，直到水位低于设定值后再自动关闭。During sta ndby operatio n

35、the feed water tank is kept warm and pressurized by two electric eleme nts (00QHJ10 AH001/AH002, 2x50% capacity), which are en gaged at the set limit (on/offcontrol).To ensure the fastest possible start-up, the set limitfor warm keeping will be equal to operational temperature.设备备用期间，除氧器的保温和保压工作由两个电

36、器元件(00QHJ10 AH001/AH002,2X50KW)完成，这两个电加热器温控运行(开关控制)。为保证最快速度的开启设备，保温的设定限制将约等同于供气温度。2.1.2Evaporation System (QHA) 蒸汽系统(QH系统)The electrode boiler has an inner vessel moun ted on ceramic in sulators in side the shell (outer vessel). The three phase electrodes (00QHA10 AH101 for boiler 10 and 00QHA20AH10

37、1 for boiler 20), each consistingof a number of bars mounted on a singleelectrode plate, are located in the inner vessel. Each electrode is suspe nded inin sulated bush ings(hollow ceramic in sulators) at the top of the boiler. The innervessel, which also forms the neutral point of the electrical sy

38、stem, divides the boiler into two water chambers (inner and outer).锅炉分为内筒和外筒。电极锅炉的内筒通过陶瓷绝缘件安装在外筒内部上方。每个三相电极(三相电极00QHA10 AH101供锅炉10所用，00QHA20 AH101供锅炉20所用)包含若干 个安在单电极盘上的金属电极棒，并被固定在内筒上方。 电极被悬在锅炉顶部的绝缘套管上(中空的陶瓷绝缘件)。锅炉内筒将成为电气系统的中性点。Electric power is con verted directly into heat as the curre nt flows thr

39、ough the water. The current passing through the water is a function of the active surface area of the electrodes and the boiler water s con ductivity. The curre nt is con trolled by regulat ing the water level, thus vary ing the active electrode area. The level is raised by closing the valve in the

40、bottom of the inner vessel (00QHA10 AA101 for boiler 10 and 00QHA20 AA101 for boiler 20) and at the same time opening the valve in the circulation pipe (00QHM01 AA003 for boiler 10 and 00QHM02 AA003 for boiler20). The level is lowered by doing the in verse.炉水导电，电能被转化成热能。炉水的电流与电极的有效表面积以及炉水电导率具有函数关系。电

41、流的控制是通过水位的调节，进而改变电极被浸没的有效面积完成的。关闭内筒底部阀门(00QHA10 AA101供锅炉10用，00QHA20 AA101供锅炉20用)，并同时开启循环 管道上的阀门(00QHM01 AA003供锅炉10用，00QHM02 AA003供锅炉20用)，可使锅炉水位 上升。反向操作则降低水位。As long as the load does not exceed the power set poin t (max. allowed powered), it is the boilers steam pressure that is con trolled.只要载荷不超过功率

42、设定点(允许的最大功率)就可控制锅炉的蒸汽压力。The water volume in the respective boiler is kept constant at set level by regulating the control valves (00QHG11 AA006 for boiler 10 and 00QHG12 AA006 for boiler 20) on the boilers respective feed water inlet pipe. The volume is calculated from the levels of both the inner a

43、nd outer (boiler) vessel.通过调节各锅炉给水管上的控制阀(00QHG11 AA006供锅炉10用，00QHG12 AA006供锅炉20用)，即可使锅炉内水量保持设定值，恒定不变。水量可通过计算锅炉内、外筒的水 位得出。The water is circulated from the outer vessel (boiler vessel) to the inner vessel by a circulati on pump.锅炉外筒的水通过循环泵泵入内筒。There are two circulation pumps (2x100%) for each boiler (

44、00QHM11/12 AP001 and 00QHM21/22 AP001).每个锅炉有两个(2x100%)循环泵(00QHM11/12 AP001 和 00QHM21/22 AP001)。If the selected pump fails and shuts down, the other pump will automatically start. 如果一个泵因自身故障停止运行，则备用泵会自动启动。The flow is approximately 180 m3/h. At operation, keeping the level of the innervessel steady,me

45、ans that the controlvalves for inner vessel and circulation pipewill be approximately 50% ope n, which means there is always a reflow of water from the inner to the outer vessel.循环泵流量约为180 m3/h。运行时，保持内筒水位恒定则意味着内筒和循环管道上的控制阀需要打开 50%左右，以保持内外两筒始终有水流动。The forced circulati on system en sures a fast start-

46、up and shut-dow n. The con sta nt mixing of water also eliminates the risk for a salt concentration at the surface, which otherwise would occur.强制循环系统可保证锅炉快速调整功率。炉水的充分混合也避免了炉水表面含盐浓度过咼的危险。After the pumps (00QHM11/12AP001 for boiler 10 and 00QHM21/22AP001 for boiler 20) there is an orifice plate (00QH

47、M11/12 BP001 forboiler 10 and 00QHM21/22 BP001 forboiler 20) for en sure that the pumps dont cavitate.循环泵(00QHM11/12AP001供锅炉10用，00QHM21/22AP001供锅炉20用)的出口装有孔 板(锅炉10的为00QHM11/12 BP001，锅炉20的为00QHM21/22 BP001)，用于防止泵气蚀。In the PLC program the outgoi ng sig nal to con trol valve (00QHM01AA003 for boiler10

48、and 00QHM02AA003 for boiler 20) is minimized to 5 % to ensure the minimum water flow.在PLC程序中，向控制阀(锅炉10的为00QHM01AA00,锅炉20的为00QHM02AA003)发 出的信号最小值为 5%以保证最低流量。The boiler water s con ductivity is main tai ned by regulat ing the in termitte nt blow down valve (00QHE02AA001for boiler 10 and 00QHE22AA001or

49、 boiler 20), which blows water from the inner vessel to the blow down tank.炉水电导率的控制靠排污阀(锅炉10为00QHE02AA001,锅炉20为00QHE22AA001间歇调节实现。排污阀把内筒排污水间歇性排放到排污罐内。A conductivity meter (00QHM01CQ001 for boiler 10 and 00QHM02CQ001 for boiler 20)is fitted in the circulation pipe.循环管道上安有电导率仪(锅炉10的为00QHM01CQ001锅炉20的为

50、00QHM02CQ001)For removing precipitated solids(sludge),the blow down valve (00QHE01 AA001/AA002 for boiler 10 and 00QHE11 AA001/AA002 for boiler 20), will ope n ma nually and blow water from the bottom of the boiler to the blow dow n tank.当排除锅炉内的沉淀物(污泥)时，手动开启排污阀(锅炉10的为00QHE01AA001/AA002, 锅炉20的为00QHE1

51、1 AA001/AA002)后，炉水会从锅炉底部被排到排污罐里。During sta ndbyoperatio n the boilers are kept warm and pressurized by two electricelements (00QHA10 AH001/AH002 for boiler 10 and 00QHA20AH001/AH002 for boiler 20, each with a capacity of 50%), which are en gaged at the set limit (on/off con trol).To ensure the faste

52、st possible start-up, the set limit for warm keeping will be 190 C . 设备备用期间，锅炉的恒温和恒压由备用加热器(锅炉10的为00QHA10AH001/AH002,锅炉20的为00QHA20AH001/AH002,各有50%勺容量)完成，以保证其处于设定限制内(开关控制)。为保证设备的快速启动，热备用期间保温的设定值为190C。For ventilatingthe protective casing (10kV connection box), there is a fan (00QHA10AN001 for boiler 1

53、0 and 00QHA20 AN001 for boiler 20), which starts when the 10kV breaker is en gaged and stops whe n the 10kV breaker stops.关于保护罩(10kV接线盒)的通风：两锅炉各有一风扇(锅炉10为00QHA10 AN001,锅炉20为00QHA20 AN001),随10kV断路器的启停而启停。For deaerating (venting) during startup sequence the boiler, there is a valve onthe steam outlet

54、(00QHF12 AA001 for boiler 10 and 00QHF22AA001 for boiler 20), which ope ns whe n the boiler pressure is below the set ope n limit and closes whe n the pressure reaches the set close limit. The venting pipe conn ects with the safety valves blow-off pipe. During sta nd-by operati on the valves are clo

55、sed.在启动顺序中，锅炉排废气：蒸汽出口处有一个阀门(00QHF12 AA001用于锅炉10 ,00QHF22 AA001用于锅炉20)，当锅炉压力低于设定的开启限值时阀门开启，当锅炉压力达 到设定的关闭限值时阀门关闭。排气管道与安全阀排出管相连。备用期间，此阀门处于关闭状态。Two pressure relief valves (safety valves 00QHF10AA001/002 for boiler 10 and 00QHF20 AA001/002) are fitted on the respective outgo ing steam line to preve nt an

56、 excess pressure in case there is a problem with the pressure control.Each valve is designedfor 50% of the flow.锅炉各有两个安全阀 (安全阀00QHF10 AA001/002 (锅炉10) , 00QHF20 AA001/002 (锅 炉20)，用以防止压力控制出现问题时产生超压事故。各阀设计流量均大于最大排放量的 50%As the produced steam has a higher pressure tha n what is required by the auxiliar

57、y steam system, the pressure is reduced by regulating the control valve (00QHF10 AA005 for boiler 10 and 00QHF20AA005 for boiler 20) on the steam outlet pipe. This controlvalve is also used for securing that theboiler pressure doesn t fall below a setlimit (min. pressure). If the pressure falls belo

58、w this limit, the valve will close in order to maintain boiler pressure. This is important because the conductivity is proportional to the water temperature and if the pressure falls, temperature falls and so does con ductivity, which in tur n makes the power fall. The“ min. pressurecontrol ” preven

59、ts this chain of events.由于锅炉产生的蒸汽压力高于辅助蒸汽系统要求的压力，所以需调节蒸汽出口管道上的控制阀(00QHF10 AA005用于锅炉10，00QHF20 AA005用于锅炉 20)以降低压力。同时，此 控制阀还用于防止锅炉供汽压力低于设定限值(最低压力)。锅炉压力的控制非常重要，因为炉水的电导率与水温是成比例的，如果压力降低，水温就会降低，进而导致电导率降低， 这样就会致使锅炉功率降低。对“最低压力”的控制就可避免这一连锁反应。A con trol valve (00QHF10 AA101 for boiler 10 and 00QHF20 AA101 for

60、 boiler 20), bypasses themin ./reducedpressurecontrolvalve and is used forpreheat in g/-pressuriz ing the steam pipe at start-up. During sta ndby operati on the steam pipe betwee n the respective boiler and the term inal point to the auxiliary steam system, is kept warm and pressurized by regulating

61、 this valve.锅炉出口控制阀旁通最小/降压控制阀(00QHF10 AA101用于锅炉10，00QHF20 AA101用于锅炉20)，且设备启动时，此控制阀还用于预热/加压蒸汽管道。设备备用期间，通过调节此阀门可以维持锅炉与辅助蒸汽系统间蒸汽管道的保温和加压。For steam flow measureme nt a measureme nt (00QHF40 CF001) is fitted in the com mon steam pipe. The flow transmitter (00QHF40 CF001) sends a 4-20mA signal, corresp on

62、ding to the steam flow, to the PLC.蒸汽流量测量是通过安装在普通蒸汽管道中的测量装置(00QHF40 CF001)实现的。流量变送器(00QHF40 CF001)向PLC发送与蒸汽流量对应的4-20mA信号。? 2.1.3 Blow down System (QHE)排污系统(QH系统)A blow dow n tank (00QHE10 BB010) is in stalledfor reduci ng pressure/temperature andcooling of blow down water and water that is drained f

63、rom boilers, feed water tank, and steam lin es.安装排污罐(00QHE10BB010)是为了降低排污水的压力/温度，排污水包括锅炉排污水、除氧器排水以及蒸汽管道排出水。Separated steam is ven tilated through a pipe which is led through the roof of the buildi ng.闪蒸的蒸汽经穿过锅炉房房顶的管道排出。The water is passed to the pla nt dra in system through a water lock which en sures a certa in water level in the tank.排污水经排水闸接入厂房排水系统里。排污罐内的水位是恒定的。A temperature tran smitter (00QHE10 CT001) sen ses the temperature in the outgo ingwater pipe and get warning if the temperature occu