【正文】 and thus a good mixing in the tank. 除氧蒸汽通過除氧器內(nèi)擴(kuò)散器管道從除氧器底部進(jìn)入除氧器，這樣有利于蒸汽與水的充分混合。An on/off valve (00QHE16AA002), fitted below the tank, acts as overflow protection: 安裝在除氧器底部的開關(guān)閥(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. 如果除氧器內(nèi)的水位達(dá)到了最高上限，則此開關(guān)閥會(huì)開啟，直到水位低于設(shè)定值后再自動(dòng)關(guān)閉。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 opening of the valve is reduced to a set value to remove the risk for cavitations in the pump due to high flow.在設(shè)備備用期間或當(dāng)鍋爐壓力低于設(shè)定值時(shí)，開啟另一個(gè)泵之前，給水控制閥(00QHG11/12 AA006)將關(guān)閉，同時(shí)閥門的開度會(huì)調(diào)整到一個(gè)設(shè)定值，以避免給水泵帶來的汽蝕危險(xiǎn)。There is one pump for each boiler (00QHG11 AP001 and 00QHA12 AP001). Each pump is designed for 100% of the flow.每臺(tái)鍋爐都配有一臺(tái)給水泵(00QHG11 AP001 和 00QHA12 AP001)，每臺(tái)泵都按100%的流量設(shè)計(jì)。The feed water tank’s pressure, and indirect its temperature, is maintained by regulating the control valve (00QHF30 AA004) for the steam from the boilers to the feed water tank.通過調(diào)節(jié)鍋爐供給除氧器蒸汽的調(diào)節(jié)閥，可保持除氧器的壓力及對(duì)應(yīng)的溫度。兩個(gè)孔板(00QHJ10 BP003/004)將調(diào)整成最有利于過量蒸汽排出的狀態(tài)。這些工作將由安裝在鍋爐和除氧器內(nèi)的380V低壓電氣元件（備用加熱器）完成。 WORD文檔 下載可編輯輔助鍋爐房電鍋爐項(xiàng)目系統(tǒng)安裝使用維護(hù)說明備注:階段設(shè)計(jì)出版日期20110828包含項(xiàng)目設(shè)計(jì)說明文件審核圖紙或圖標(biāo)0批準(zhǔn)文件狀態(tài)CFC總數(shù)CAD管理版次0遞交文件號(hào)HYGMB20V7YZDI024遞交文件號(hào)HYGMB20V7YZDI014資料名稱系統(tǒng)說明版次日期設(shè)計(jì)審核批準(zhǔn)CAD管理備注0 技術(shù)資料 專業(yè)分享 WORD文檔 下載可編輯系統(tǒng)說明Table of Content目錄1 Functions of the System系統(tǒng)功能 6 Safety classified functions安全分類功能 6 Operational Functions運(yùn)行功能 62 General Description of the System系統(tǒng)一般說明 7 System系統(tǒng) 7 Feed water System (QHG) 給水系統(tǒng) 7 Evaporation System (QHA) 汽化系統(tǒng) 7 Blow down System (QHE) 排污系統(tǒng) 9 Chemical Dosing System (QCC, QCF) 化學(xué)加藥系統(tǒng) 9 Sampling System (QUB) 取樣系統(tǒng) 10 Compressed / Instrument Air System (QHP) 壓縮空氣/儀表系統(tǒng) 10 Main Components主要部件 11 Deaerator/Feed water tank除氧器/給水箱 11 Feed water pumps給水泵 11 Boilers鍋爐 11 Circulation pumps循環(huán)泵 12 Makeup water pumps補(bǔ)水泵 12 Blow down tank排污罐 123 Operation of the system系統(tǒng)運(yùn)行 13 Normal system operating conditions系統(tǒng)正常運(yùn)行工況 13 Abnormal system operating conditions系統(tǒng)異常運(yùn)行工況 14 Normal plant operating conditions電站正常運(yùn)行工況 15 Abnormal plant operating conditions電站異常運(yùn)行工況 15 Effects on the ASGS at failure or malfunctions in associated systems因ASGS故障或輔助系統(tǒng)故障產(chǎn)生的影響 154 System Design系統(tǒng)設(shè)計(jì) 16 General Design Basis總體設(shè)計(jì)基礎(chǔ) 16 Codes and Standards規(guī)范和標(biāo)準(zhǔn) 16 Safety Classification安全等級(jí) 16 Safety related design criteria相關(guān)安全設(shè)計(jì)標(biāo)準(zhǔn) 16 Protection against Internal Hazards內(nèi)部危害防護(hù) 16 Protection against external hazards外部危害防護(hù) 17 Ambient conditions環(huán)境條件 17 Component Design Basis部件設(shè)計(jì)基礎(chǔ) 17 Installation安裝 18 Materials材料 18 Electrical and Control Equipment電氣和控制設(shè)備 18 Automatic Control and On/Off Functions自動(dòng)控制和開關(guān)功能 19 Boiler鍋爐: 19 Start amp。?2General Description of the System系統(tǒng)一般說明 System系統(tǒng)說明? water System (QHG)鍋爐給水系統(tǒng)（QHG系統(tǒng)）Makeup water, demineralized water (QHC) is fed to the feed water tank (00QHJ10 BB010) by makeup water pumps to the sprayer, which is part of the feed water tank. 除氧器（00QHJ10 BB010）的補(bǔ)水是除鹽水（QHC系統(tǒng)），是由補(bǔ)水泵（00QHC11 AP001/00QHC12AP001）和除氧器噴嘴之間的設(shè)備完成的。為了節(jié)能，在設(shè)備備用期間此閥門將處于關(guān)閉狀態(tài)。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. 除氧蒸汽通過除氧器內(nèi)擴(kuò)散器管道從除氧器底部進(jìn)入除氧器，這樣有利于蒸汽與水的充分混合。The selected feed water pump is running continuously during normal operation. If the selected pump fails and shuts down, the spare pump (00QHG13AP001) will automatically start. Correspondingly the onoff valve 00QHG14AA001 opens to boiler 00QHA10AC010 and onoff valve 00QHG15AA001 opens to boiler 00QHA20AC010.設(shè)備正常運(yùn)行期間，給水泵是連續(xù)運(yùn)行的。During standby operation the feed water pump fills the boiler between two water volume set points.設(shè)備運(yùn)行期間，給水泵的給水量處于兩個(gè)水量設(shè)定值之間。During standby operation the feed water tank is kept warm and pressurized by two electric elements (00QHJ10 AH001/AH002, 2x50% capacity), which are engaged at the set limit (on/off control). To ensure the fastest possible startup, the set limit for warm keeping will be equal to operational temperature. 設(shè)備備用期間，除氧器的保溫和保壓工作由兩個(gè)電器元件(00QHJ10 AH001/AH002, 2x50KW)完成，這兩個(gè)電加熱器溫控運(yùn)行（開關(guān)控制）。One pressure relief valve (safety valve 00QHJ10 AA010) is fitted on the tank to prevent an excess pressure in case there is a problem with the pressure control. 除氧器安裝一個(gè)安全閥（安全閥00QHJ10 AA010），用于防止壓力控制出現(xiàn)問題時(shí)造成的超壓事故。如果給水泵不能正常工作，則備用泵(00QHG13AP001)會(huì)自動(dòng)啟動(dòng)。Each pump has a minimum flow valve (00QHG11/12/13 AA003), which secures the pumps’ minimum flows. The min flow valves will open automatically at set pressure and the water is pumped back to the feed water tank.給水泵有最低流量閥(00QHG11/12/13 AA003)，用于維持泵的最小流量。為保證最快速度的開啟設(shè)備，保溫的設(shè)定限制將約等同于供氣溫度。電極被懸在鍋爐頂部的絕緣套管上（中空的陶瓷絕緣件）。電流的控制是通過水位的調(diào)節(jié)，進(jìn)而改變電極被浸沒的有效面積完成的。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 and outer (boiler) vessel.通過調(diào)節(jié)各鍋爐給水管上的控制閥(00QHG11 AA006供鍋爐10 用， 00QHG12 AA006供鍋爐20用)，即可使鍋爐內(nèi)水量保持設(shè)定值，恒定不變。If the selected pump fails and shuts down, the other pump will automatically start.如果一個(gè)泵因自身故障停止運(yùn)行，則備用泵會(huì)自動(dòng)啟動(dòng)。爐水的充分混合也避免了爐水表面含鹽濃度過高的危險(xiǎn)。The boiler water’s conductivity is maintained by regulating the intermittent blow down valve (00QHE02AA001 for boiler 10 and 00QHE22AA001 for boiler 20), which blows water from the inner vessel to the blow down tank.爐水電導(dǎo)率的控制靠排污閥(鍋爐10為00QHE02AA001 ，鍋爐20為00QHE22AA001)間歇調(diào)節(jié)實(shí)現(xiàn)。During standby operation the boilers are kept warm and pressurized by two electric elements (00QHA10 AH001/AH002 for