機組化學運行規(guī)程加藥流程翻譯-中英對照
次氯酸鈉溶液通過連續(xù)加藥泵實現(xiàn)連續(xù)加藥。當次氯酸鈉儲罐內(nèi)的溶液達到一定高度時，即可啟動沖擊加藥泵，達到?jīng)_擊加藥所需流量。
連續(xù)加藥時，兩臺機組共需58m3/h的連續(xù)加藥流量，即可維持1ppm的有效氯濃度。余下的次氯酸鈉溶液將被儲存在儲罐內(nèi)，以備沖擊加藥。當儲罐內(nèi)次氯酸鈉溶液儲存到一定量后，啟動沖擊加藥泵，以72m3/h的流量進行沖擊加藥30分鐘，即可達到3ppm的有效氯濃度。
海水預處理加藥需1m3/h的連續(xù)加藥流量即可達到2.0 mg/l。
反滲透加藥需1m3/h的連續(xù)加藥流量即可達到2.0 mg/l。
五．排氫和排污：
氫氣被稀釋到1%以下后通過次氯酸鈉儲罐頂部的排氫口安全地排到大氣中。
電解過程產(chǎn)生的鈣、鎂沉淀物在次氯酸鈉儲罐底部，經(jīng)排污閥定期排出。
六．酸洗：
電解海水時，除產(chǎn)生次氯酸鈉和氫氣外，還不可避免地產(chǎn)生鈣、鎂沉淀物，并在電解槽陰極上累積，導致電解槽槽電壓升高，電流效率下降，電耗增大。因此須定期地對電解槽進行酸洗，以除去陰極表面的沉淀物。這時由PLC分析運行時間和槽壓的異常來自動判斷是否需要酸洗。當需要酸洗時給出報警信號，同時在系統(tǒng)控制柜面板上提供燈光報警，根據(jù)需要進行酸洗。在酸洗的過程中，發(fā)生器將被鎖住不能運行。直至酸洗完成后，自行解鎖并處于備用狀態(tài)。
以上操作不需拆卸任何設備和管道，更不會對操作人員造成任何傷害。
第二節(jié) 主要設備工作原理和技術規(guī)范
一．海水升壓泵：
海水升壓泵選用大連耐酸泵LH型立式、單級單吸液下泵，數(shù)量為3臺。型 號LH50—400；流 量：34m3/h；壓 力0.35 MPa；軸 長： 4.5 m；海水升壓泵的軸、軸套及葉輪材質(zhì)選用進口316L不銹鋼。立式長軸液下泵軸承采用進口產(chǎn)品；電機轉(zhuǎn)速為1450r/min。
二．自動反洗過濾器：
1．工作原理：
自動反沖洗過濾器利用系統(tǒng)的壓差，在不影響海水流動的情況下自動進行反沖洗，清洗時不需要獨立的清洗液的供應。正常操作時，粗海水從過濾器入口進入濾網(wǎng)筐，所有直徑大于0.5mm的雜質(zhì)截留在濾網(wǎng)上。這個過程連續(xù)進行直到雜質(zhì)在過濾器濾網(wǎng)上積累到一定程度，導致壓差增加，當壓差控制器到達預先設定值（0.035Mpa）時，自動反沖洗開始啟動。連接到反沖洗出口的滑動密封片有效地清掃了過濾網(wǎng)的每個部位。過濾器殼體內(nèi)部壓力高于反沖洗出口管的壓力，導致一部分海水通過隔離濾網(wǎng)以反方向流動，有效地沖洗了所有累積的雜質(zhì)，并通過排污閥排到地溝中。
整個操作過程通過壓差控制器自動進行。當所有的過濾器網(wǎng)被清洗完畢，自動反沖洗循環(huán)停止，過濾器恢復到正常方式直到壓差控制器下一次動作，重復進行清洗。
2．設備特點：
- 反沖洗時不需停機，且反沖洗所用海水量很少。
反沖洗采用小功率電動機，體積小，重量輕，維護方便。
● 過濾器上蓋可方便拆卸，便于濾網(wǎng)的維修。
● 獨特的濾網(wǎng)結構防止雜質(zhì)堵塞，抗機械磨損和流體沖刷能力強。
● 濾網(wǎng)和反沖洗組件的分離消除了損壞的可能性。
● 進口316L不銹鋼本體保證了較強的耐海水腐蝕性能和較長的使用壽命。
● 反沖洗組件的低慣性保證了最低的能耗。
● 排污閥采用電動球閥，反沖洗時球閥自動打開，沖洗完畢后球閥自動關閉。
3．設備規(guī)范：
ZHG56-LA型自動反沖洗過濾器，處理水量68m3/h。
三．次氯酸鈉發(fā)生器：
1．工作原理：
通過電解槽組件的海水被直流電電解，分別在陰陽極上發(fā)生如下反應：
陽極反應： 2Cl—2e→Cl2 （1）
陰極反應： 2H2O+2e→2OH-+H2↑ （2）
電解槽極間反應： Cl2+ 2NaOH→2NaClO+H2↑ （3）
次氯酸和次氯酸根統(tǒng)稱為有效氯，防海生物污損就是利用電解海水產(chǎn)生的有效氯。
2．設備特點：
電解槽蓋：槽蓋采用透明的耐紫外線有機玻璃加工制造，操作人員在運行過程中可以透過槽蓋直接觀察槽內(nèi)反應情況，有利于直觀地判斷和掌握電解槽維修和酸洗的時機，便于操作人員管好、用好設備。
電解槽殼體：殼體采用極耐次氯酸鈉腐蝕的PVC材料制成，同其它材料相比，具有強度高，耐老化，耐腐蝕等特點，具有更高的安全性和穩(wěn)定性，消除了液體泄漏問題。
陽極：陽極采用STDN公司專利開發(fā)的電解海水專用鈦涂貴金屬氧化物涂層陽極，即DSA®。針對東南亞海水的特點，STDN公司專門開發(fā)了適合其特點的電解海水專用陽極，以確保電解槽在10～35℃溫度范圍內(nèi)均有良好的電化學性能和使用壽命，特別是酸洗周期大大延長，同時提高了電解效率。海水中的Mn含量對電極正常使用壽命、電流效率無影響。
陽極為板網(wǎng)式形狀，增加了海水的湍流，提高了電解效率。板網(wǎng)狀陽極比板式陽極的有效活性面積大，提高了產(chǎn)氯量，陽極和陰極用PVDF隔片保持最佳間距，進一步降低了槽電壓，減少了能耗。
陰極：陰極采用哈氏合金制造。哈氏合金在海水和次氯酸鈉介質(zhì)中比鈦具有更強的耐蝕性，而且這種合金的析氫電位比鈦低0.45V，從而可降低電耗10～15%。該合金板表面拋光，減少了沉淀物的沉積。和鈦陰極相比，哈氏合金在大電流工作時，不會產(chǎn)生氫脆，不會出現(xiàn)“析氫腐蝕減薄現(xiàn)象”，克服了鈦陰極只能使用4～5年而必須更換的問題，真正地永不損壞。
密封：槽內(nèi)導電件的密封采用氟橡膠O型圈，殼體和蓋的密封用硅橡膠O型圈。這些密封形式和特制密封材料經(jīng)長期運行證明有極好的密封性能。
金屬零件：槽內(nèi)所有緊固件和結構件的材料均為鈦，外部的緊固件為硅青銅。所有緊固件均用扭力扳手按規(guī)定的力矩擰緊，保證了密封的可靠性。
導電：電解槽陰極或陽極的導電連接件為鈦-銅復合棒，復合棒在槽內(nèi)部分為鈦，在槽外部分為銅。這樣既避免了腐蝕，又保證導電良好。槽間電連接采用銅排，拆卸十分簡便、快捷。
設計：電解槽內(nèi)陽極為單極型。電解槽直立放置，海水由下向上一次性高速流過。電解產(chǎn)生的氫氣能順著水流順利排出，不會在槽內(nèi)積存。鈣鎂沉淀物在高流速下減緩了在陰極上的積存，延長了酸洗周期。
2．設備規(guī)范：
電流效率： ³83%
直流電耗： £3.76kWh/kg
交流電耗： £4.43kWh/kg
陽極累計使用時間： ³43800h
酸洗周期： ³1080h
電解槽是采用Seven-Trent De Nora公司最新技術制造的SC400/1型單極式網(wǎng)狀透明結構的國產(chǎn)海水電解槽。
發(fā)生器的結構:
數(shù)量: 2套
有效氯產(chǎn)率: ≥65 kg/h.套
陽極壽命: ≥5 年
陰極壽命: ≥20 年
析氯電位 ≤1.13V（S.C.E）
交流電耗 ≤3.76kW•h/kg•Cl2
直流電耗 ≤4.43kW•h/kg•Cl2
電極材料: 陽極采用DSA﹫陽極(進口)
陰極采用哈氏合金C材料
酸洗周期: ≥1080h
3．設備的功能和作用：
電解槽為整套裝置的核心部件，通過電解槽的海水被直流電電解產(chǎn)生有效氯，因此電解槽的性能最直接影響整套裝置的性能。整套裝置共有兩組電解槽模塊并聯(lián)，每組電解槽模塊是由水路、電路串聯(lián)的共9個SC400/1型電解槽組成，有效氯產(chǎn)量為65kg/h/套。
四．次氯酸鈉溶液儲罐：
1．技術要求：
1) 次氯酸鈉溶液貯存罐的設計充分考慮氣液分離空間。貯存罐的結構便于氫氣的安全排放和沉淀物的排出。罐上配備液位計，該液位計具有就地顯示和信號遠傳功能。罐體貯液容積保證滿足4小時貯存夠單臺機組一次沖擊加藥所需用量加兩臺機組連續(xù)加藥10min.緩沖容量之和的1.15倍容量。
2) 次氯酸鈉溶液貯存罐室外布置，其材質(zhì)應采用不透光的耐次氯酸鈉溶液腐蝕的材料制造，外壁能抗老化、防鹽霧腐蝕。
3) 次氯酸鈉溶液貯存罐除具有正常運行所需接口外，還應配有液位測量及控制接口、排污接口、脫氫接口、溢流接口及人孔等。
2．功能和作用：
次氯酸鈉儲罐主要有以下三種作用：
a． 稀釋氫氣至1%以下并排入大氣中。
B．儲存次氯酸鈉溶液，在電解單元和加藥單元的流量出現(xiàn)不平衡時，保證加藥單元連續(xù)、正常、穩(wěn)定地運行。
C．定期排放電解過程中產(chǎn)生的沉淀物。
3．設備規(guī)范：
數(shù)量: 2臺
結構材料: 鋼襯膠
結構型式: 立式、錐底、橢圓頂
有效容積: 50m3
附件: 人孔、就地液位指示、藥液進口、藥液出口、進風口、溢流管道、排污口等
外部連接方式: 法蘭
五．加藥泵的設備規(guī)范：
連續(xù)加藥泵 沖擊加藥泵 海水預處理加藥泵 反滲透加藥泵
數(shù)量 3臺 2臺 2臺 2臺
結構型式 臥式離心泵 臥式離心泵 隔膜泵 臥式離心泵
過流部分材質(zhì) 氟塑料合金 氟塑料合金 PVDF 氟塑料合金
適用介質(zhì) NaClO溶液 NaClO溶液 NaClO溶液 NaClO溶液
電機 防爆 防爆 防爆 防爆
流量 29m3/h 72m3/h 2m3/h 7.5m3/h
揚程 0.25Mpa 0.25Mpa 0.5Mpa 0.3Mpa
一．酸洗系統(tǒng)：
1．酸洗泵的設備規(guī)范：
型號 40FSB-25氟合金泵泵
流量： 3.6 m3/h
揚程： 0.25 Mpa
電機功率： 2.2 kw
2．酸液貯存罐：
數(shù)量: 1臺
容積: 1.5m3
結構材料: 鋼襯膠
結構型式: 立式、平底
附件: 就地液位指示、藥液進口、藥液出口、酸霧出口、排污口等
外部連接方式: 法蘭
3．酸清洗罐：
數(shù)量: 1臺
容積: 1.5m3
結構材料: 鋼襯膠
結構型式: 立式、平底
附件: 就地液位指示、藥液進口、藥液出口、溢流管道、排污口等
外部連接方式: 法蘭
第三節(jié) 系統(tǒng)運行及控制
一．系統(tǒng)的運行：
1．系統(tǒng)啟動前的檢查：
檢查各溶液箱，液位計是否正常備用，排污門是否關閉，進出口管連接是否完好備用。
各泵出入口是否正常，管道與閥門，閥蘭連接是否正常。
聯(lián)系電氣送電并測電機絕緣合格。
各壓力表及儀表一次門是否正常，表計應完好備用。
2．冷卻水系統(tǒng)的啟動：
確定系統(tǒng)各項正常時，啟冷卻水泵運行。
3．制次氯酸鈉系統(tǒng)的啟動：
啟海水升壓泵；
投自動反洗過濾器運行；
開換熱器進出水門；
投發(fā)生器運行并調(diào)整流量；
當發(fā)生器取樣管有水流出時，啟動整流器并調(diào)整電流；
當系統(tǒng)參數(shù)穩(wěn)定后，系統(tǒng)處于正常運行狀態(tài)，向次氯酸鈉貯存罐供藥液；
4．制次氯酸鈉系統(tǒng)的停運：
將整流器電流調(diào)至最小后，停止整流器工作；
停加藥系統(tǒng)運行；
停海水升壓泵運行；
關相應閥門排出電解槽的電解液；
停冷卻水系統(tǒng)運行；
注：以上操作步序不能顛倒；
5．加藥系統(tǒng)的運行：
當次氯酸鈉貯存罐液位達到適量值時，啟動連續(xù)加藥泵運行；當次氯酸鈉貯存罐液位達到另一適量值時，啟動沖擊加藥泵、海水預處理加藥泵和反滲透加藥泵運行；
當次氯酸鈉貯存罐液位達到低位適量值和整流器停運時，必須停加藥系統(tǒng)運行或人為視情況停運加藥系統(tǒng)；
6．酸洗系統(tǒng)的運行：
在稀酸溶液罐中配置適量濃度的稀酸溶液；
啟動酸泵，此時酸系統(tǒng)和發(fā)生器間組成一閉路系統(tǒng)對發(fā)生器電極進行酸洗；
適量時間，排掉廢酸液，在稀酸溶液箱中加水進行水沖洗；
沖洗水水質(zhì)合格后，停止酸泵運行，關閉相應閥門，發(fā)生器酸洗結束
IV. Chemical Adding Process:
Continuous chemical adding pump is used to add drugs into the sodium hypochlorite solution successively. When the solution in the sodium hypochlorite storage tank rises to a certain level, it is available to start up the impacting chemical adding pump, achieving the flow required by impacting chemical adding.
During continuous chemical adding, two units require a totally continuous chemical adding quantity of 58m3/h to maintain the effective chlorine concentration of 1ppm. The remaining sodium hypochlorous solution will be stored in the tank for impacting chemical adding. When the sodium hypochlorous solution accumulates to a certain quantity, start up the impacting chemical adding pump, keeping impacting chemical adding for 30 minutes with a flow of 72m3/h in order to obtain an effective chlorine concentration of 3ppm.
Seawater pretreatment chemical adding requires a continuous chemical adding flow of 1m3/h to achieve 2.0 mg/l.
Anti-penetrating chemical adding requires a continuous chemical adding flow of 1m3/h to achieve 2.0 mg/l.
V．Hydrogen Discharging and Sewage Draining:
After being diluted below 1%, the hydrogen air is safely discharged into the atmosphere from the outlet on the top of sodium hypochlorite storage tank.
The calcium and magnesium generated in the electrolytic process precipitate at the bottom of the sodium hypochlorite storage tank, which are discharged through the blowdown valve regularly.
VI．Acid Rinsing:
On electrolyzing seawater, it is unavoidable to generate precipitates as calcium and magnesium besides sodium hypochlorite and hydrogen gas, which accumulate on the cathode of the electrolytic cell, resulting in the increase of cell voltage, the decrease of current efficiency and the growth of power consumption as well. Therefore, it is necessary to do some acid rinsing to the electrolytic cell regularly so as to remove the precipitates on the surface of cathode. At this moment, PLC is used to analyze the running time and the abnormality of cell voltage in order to judge if acid rinsing is required. Giving alarming signal during acid rinsing and light warning on the panel of control cabinet is necessary for acid rinsing. During the course of acid rinsing, the generator will be locked till the acid rinsing is completed, which shall be unlocked automatically for standby after it.
Operation mentioned above does not need disassemble any equipment or pipeline and do no harm to operators.
Section II Working Principle and Technical Specification of Main Equipment
I. Seawater Booster Pump:
The seawater booster pump selects Dalian Acid-resistant Pump, LH vertical type single-stage and single-suction submergible pump, 3 sets. The model: LH50—400; the flow rate: 34m3/h; the pressure: 0.35 MPa; the axial length: 4.5m; the axle, axle sleeve and impeller of the seawater booster pump are all made of 316L stainless steel form abroad. The bearing of vertical long-axle submerged pump is an imported one; the motor speed is 1450r/min.
II．Automatic Backwashing Filter:
1．Working Principle:
Automatic backwashing filter utilizes the pressure difference of system to implement backwashing without any influence on flowing of seawater and no special cleaning fluid is required during the cleaning process. In the normal operation, crude seawater runs into sieve through the inlet of filter, all impurities with diameter larger than 0.5mm will be retained on the sieve. This process carries on until the impurities accumulate to a certain degree, which causes the increase of pressure difference, when the pressure differential controller achieves the preset value（0.035Mpa）, automatic backwashing starts up. Sliding seal plate connected to the backwashing outlet will clean each part of sieve effectively. The internal pressure in the filter shell is higher than that of backwashing outlet pipe, thus some seawater flows in an opposite direction through sieve and cleans all accumulated impurities effectively, discharging them into trench through the blowdown valve.
The whole process is carried out by the differential pressure controller automatically. After all sieves of filters were cleaned, the automatic backwash cycle stops, and filters restore to the normal mode till next action of the pressure controller takes place, washing repeatedly.
2．Characteristics of Equipment:
- It is unnecessary to shut down during backwashing and the water consumption for backwashing is quite low.
Backwashing adopts small and light motor with low power for convenience of maintenance.
● The lid of filter shall be easily disassembled for maintenance of the sieve,
● Unique structure of sieve prevents from being blocked by impurities with strong anti-mechanical wear and anti-scour abilities.
● The possibility of damage is eliminated due to the separation of sieve and backwashing components.
● The imported 316L stainless steel has strong anti-corrosion ability to seawater and longer service life.
● The low inertia of backwashing components ensures the minimum power consumption.
● The blowdown valve adopts an electric ball valve, which opens automatically during backwashing and closes after it.
3．Equipment Specification:
ZHG56-LA Automatic Backwashing Filter, water treatment capacity is 68m3/h.
III．Sodium Hypochlorite Generator:
1．Working Principle:
The seawater that passes through the electrolytic cell shall be electrolyzed at both anode and cathode with chemical reactions as below:
Anodic reaction： 2Cl—2e→Cl2 （1）
Cathodic reaction： 2H2O+2e→2OH-+H2↑ （2）
Reaction between electrodes of electrolytic cell: Cl2+ 2NaOH→2NaClO+H2↑ （3）
Hypochlorous acid and hypochlorous acid ion are all called effective chlorine, and prevention of sea biological defile is realized by using effective chlorine which is generated from electrolyzing seawater.
2．Characteristics of Equipment:
Lid of electrolytic cell: the lid is made of UV-resistant organic glass which is transparent so that the operator is able to directly observe chemical reactions in the cell through the lit during operation which is helpful for operators to judge and master maintenance of electrolytic cell and time of acid rinsing well.
Shell of electrolytic cell: the shell is made of PVC with perfect corrosion resistance to the sodium hypochlorite. This material possesses features of high strength, anti-aging and corrosion resistance compared with other materials with higher safety and stability, eliminating the leakage of liquid.
Anode: the anode adopts titanium anode coated with rare metallic oxide specially for electrolyzing seawater which is a patent developed by STDN Company, i.e. DSA®. Aiming at features of water in Southeast Asia, STDN Company focuses on developing the anode for electrolyzing seawater and ensuring that the electrolytic cell can keep good chemical performance and service life within a temperature range of 10～35℃, prolonging the long acid rinsing period and improving electrolytic efficiency. The content of Mn in seawater will have no effect on the normal service life and current efficiency.
The shape of anode is a plate-net type, which increases flow of seawater as well as electrolytic efficiency. The active area of plate-net type anode is larger than that of plate type anode, which increases the yield of chlorine. The PVDF spacer separates the anode and the cathode with an optimal space so as to decrease cell voltage and energy consumption as well.
Cathode: the cathode is made of Hastelloy Alloy. The Hastelloy Alloy has better corrosion resistance than titanium in mediums of seawater and sodium hypochlorite solution, and the hydrogen-evolution potential of this alloy is 0.45V lower than titanium so the power consumption can be decreased by 10～15%. The polished surface of alloy plate reduces precipitates. Comparing with titanium cathode, hardly any hydrogen brittleness or “hydrogen evolutional corrosion thinning phenomenon” will occur during large current, it overcomes the trouble of replacing titanium cathode only using for 4~5 years and permanent application will be realized.
Sealing: the sealing of conduct piece in the cell adopts fluorine rubber o-ring, the shell and lid are sealed with silicone rubber o-ring. These sealing ways and special materials with excellent sealing performance have been proved already.
Metallic parts: all fasteners and structural components in the cell are made of titanium; the material of exterior fasteners is silicon bronze. All fasteners shall be tightly screwed up with wrenches in accordance with regulations so as to ensure the reliability of sealing.
Conduction: the conductive connector of cathode or anode in the electrolytic cell shall be a titanium-copper composite rod, the part inside the cell shall be titanium and the part outside the cell shall be copper in order to prevent corrosion and ensure the good conductivity. Copper bars are applied for connection between cells which is easy to disassemble.
Design: the anode in the electrolytic cell is a single-pole type. The electrolytic cell is upright and seawater flows upwards with a high speed. The hydrogen gas generated by electrolyzing water can be discharged in the same direction with waterflow without staying in the cell. The high flow velocity reduces the accumulation of precipitates as calcium and magnesium at the cathode which prolongs acid rinsing period.
2．Equipment Specification：
Current efficiency： 83%
DC consumption： 3.76kWh/kg
AC consumption： 4.43kWh/kg
Service duration of anode： 43800h
Acid rinsing period： 1080h
It adopts the domestic seawater electrolytic cell with a netlike and transparent structure of SC400/1 monopolar type which is produced by introducing the latest technology of Seven-Trent De Nora Company.
Structure of Generator:
Quantity: 2 Sets
Yield of effective chlorine: ≥65 kg/h. set
Anode lifetime: ≥5 Years
Cathode lifetime: ≥20 Years
Chlorine evolution potential ≤1.13V（S.C.E）
AC consumption ≤3.76kW•h/kg•Cl2
DC consumption ≤4.43kW•h/kg•Cl2
Electrode material: Anode adopts DSA﹫Anode (import)
Cathode is made of Hastelloy alloy C
Acid rising period: ≥1080h
3．Functions and Effects of Equipment:
The electrolytic cell is the core component of the whole device, and the seawater passes through the electrolytic cell is electrolyzed by DC, generating effective chlorine, thus the performance of electrolytic cell directly affects the whole device. As for the device, there are two groups of electrolytic cell modules in parallel connection, and each group is composed of 9 SC400/1 type electrolytic cells through series connection of water circuit and electric circuit, with a yield of effective chlorine of 65kg/h/set.
IV．Storage Tank for Sodium Hypochlorite Solution:
1．Technical Requirement:
1) The design of the sodium hypochlorite storage tank should take space of gas-liquid separation into consideration. The structure of storage tank shall be designed to discharge hydrogen gas and precipitates safely. The tank is fixed with a level gauge with functions of in-situ indication and signal distant transmission. The storage tank shall hold a volume for 4 hours that is 1.15 times of once impact chemical adding quantity by one single unit and buffer capacity of continuous chemical adding quantity by two units for 10min.
2) The outdoor layout for the storage tank of sodium hypochlorite solution, which shall be made of opaque materials with good performance of corrosion resistance to the sodium hypochlorite solution, the outer wall shall be anti-aging and salt spray proofing.
3) Besides interfaces for regular operation, the sodium hypochlorite storage tank shall be equipped with liquid-level measuring and controlling interfaces, the blowdown interface, the dehydrogenation interface, the overflow interface and the manhole, etc.
2．Functions and Effects:
The three functions of the storage tank for sodium hypochlorite solution are as follows:
A．Dilute hydrogen air below 1% and discharge it into the atmosphere.
B．Store the sodium hypochlorous solution, when unbalanced flow occurs to electrolytic unit and chemical adding unit, it is necessary to ensure that the chemical adding unit operates continuously, normally and steadily.
C．Discharge precipitates generated during electrolytic process periodically.
3．Equipment Specification:
Quantity: 2 Sets
Material: Steel rubber line
Stricture & Type: Vertical, cone bottom, elliptic top
Effective volume: 50m3
Accessory: Manhole, in-situ liquid level indication, liquid inlet, liquid outlet, air inlet, overflow pipeline, sewage outlet, etc.
External connecting ways: Flange
V. Equipment Specification of Chemical adding Pump:
Continuous chemical adding pump Impacting chemical adding pump Seawater pretreatment chemical adding pump Anti-penetrating chemical adding pump
Quantity 3 Sets 2 Sets 2 Sets 2 Sets
Structure & Type Horizontal centrifugal pump Horizontal centrifugal pump Diaphragm pump Horizontal centrifugal pump
Overflow partial materials Fluoroplastic alloy Fluoroplastic alloy PVDF Fluoroplastic alloy
Applicable medium NaClO solution NaClO solution NaClO solution NaClO solution
Motor Anti-explosion Anti-explosion Anti-explosion Anti-explosion
Flow 29m3/h 72m3/h 2m3/h 7.5m3/h
Lift 0.25Mpa 0.25Mpa 0.5Mpa 0.3Mpa
I．Acid rising system:
1. Equipment specification of acid rising pump:
Model: 40FSB-25 Fluoroplastic Alloy Pump
Flow: 3.6 m3/h
Lift: 0.25 Mpa
Power of motor: 2.2 kw
2. Acid liquid storage tank:
Quantity: 1 Set
Volume: 1.5m3
Material: Steel rubber line
Stricture & Type: Vertical, flat bottom
Accessory: In-situ liquid level indication, liquid inlet, liquid outlet, acid vapor outlet, sewage outlet, etc.
External connecting ways: Flange
3. Acid rising tank:
Quantity: 1 Set
Volume: 1.5m3
Material: Steel rubber line
Stricture & Type: Vertical, flat bottom
Accessory: In-situ liquid level indication, liquid inlet, liquid outlet, overflow pipeline, sewage outlet, etc.
External connecting ways: Flange
Section III. Operation and Control of System
I. Operation of System
1. Checking before startup of the system:
Check if each solution tank and level gauge is ready for use, if the blowdown valve is closed and if the inlet pipe and outlet pipe are well connected.
Check if the inlet/outlet of the pump is intact, if the connection of pipeline and valve is good, and if the joint of flanges is good.
Implement electric power transmission and ensure the motor is well insulated.
Check if the primary valve of each pressure gauge and instrument is in good conditions, and the gauge and instrument shall be intact.
2. Startup of the cooling water system:
Ensure that each part of the system is in good conditions and the cooling water pump operates well.
3．The startup of system for making sodium hypochlorite:
Start up the seawater booster pump;
Make the automatic backwashing filter operate;
Open water inlet/outlet of the heat exchanger;
Make the generator operate and adjust the flow rate;
When water flows out from sampling tube of the generator, start up the rectifier and regulate the current.
Since the system parameters become stable, the system is in a normal state, then feed liquid to the sodium hypochlorite storage tank;
4. The shutdown of system for making sodium hypochlorite
After adjusting the rectifier to the minimum value, shut down the rectifier;
Shut down the chemical adding system;
Shut down the seawater booster pump;
Close relevant valve and discharge electrolyte in the electrolytic cell;
Shut down cooling water system;
Notes: the operation steps mentioned above can not be reversed;
5. Operation of chemical adding system:
When liquid in the sodium hypochlorite storage tank achieves a proper level, start up the continuous chemical adding pump; when liquid in the sodium hypochlorite storage tank achieves another proper level, start up the impact chemical adding pump, seawater pretreatment chemical adding pump and anti-penetrating chemical adding pump;
When liquid in the sodium hypochlorite storage tank achieves a proper level at the low position and the rectifier shuts down, it is compulsory to shut down the chemical adding system or stop it artificially according to particular situations;
6. Operation of acid rinsing system:
Prepare dilute acid solution with a proper concentration in the dilute acid tank;
Start up the acid pump, a closed-loop system has been formed between the acid system and the generator where acid rinsing carries out on electrodes of the generator at the same time;
Discharge waste acid solution and rinse in the dilute acid tank with water timely;
After the rinsing water is qualified, shut down the acid pump and close the relevant valve, the acid rinsing for the generator is completed;
2012.11.14