机组化学运行规程加药流程翻译-中英对照
次氯酸钠溶液通过连续加药泵实现连续加药。当次氯酸钠储罐内的溶液达到一定高度时，即可启动冲击加药泵，达到冲击加药所需流量。
连续加药时，两台机组共需58m3/h的连续加药流量，即可维持1ppm的有效氯浓度。余下的次氯酸钠溶液将被储存在储罐内，以备冲击加药。当储罐内次氯酸钠溶液储存到一定量后，启动冲击加药泵，以72m3/h的流量进行冲击加药30分钟，即可达到3ppm的有效氯浓度。
海水预处理加药需1m3/h的连续加药流量即可达到2.0 mg/l。
反渗透加药需1m3/h的连续加药流量即可达到2.0 mg/l。
五．排氢和排污：
氢气被稀释到1%以下后通过次氯酸钠储罐顶部的排氢口安全地排到大气中。
电解过程产生的钙、镁沉淀物在次氯酸钠储罐底部，经排污阀定期排出。
六．酸洗：
电解海水时，除产生次氯酸钠和氢气外，还不可避免地产生钙、镁沉淀物，并在电解槽阴极上累积，导致电解槽槽电压升高，电流效率下降，电耗增大。因此须定期地对电解槽进行酸洗，以除去阴极表面的沉淀物。这时由PLC分析运行时间和槽压的异常来自动判断是否需要酸洗。当需要酸洗时给出报警信号，同时在系统控制柜面板上提供灯光报警，根据需要进行酸洗。在酸洗的过程中，发生器将被锁住不能运行。直至酸洗完成后，自行解锁并处于备用状态。
以上操作不需拆卸任何设备和管道，更不会对操作人员造成任何伤害。
第二节 主要设备工作原理和技术规范
一．海水升压泵：
海水升压泵选用大连耐酸泵LH型立式、单级单吸液下泵，数量为3台。型 号LH50—400；流 量：34m3/h；压 力0.35 MPa；轴 长： 4.5 m；海水升压泵的轴、轴套及叶轮材质选用进口316L不锈钢。立式长轴液下泵轴承采用进口产品；电机转速为1450r/min。
二．自动反洗过滤器：
1．工作原理：
自动反冲洗过滤器利用系统的压差，在不影响海水流动的情况下自动进行反冲洗，清洗时不需要独立的清洗液的供应。正常操作时，粗海水从过滤器入口进入滤网筐，所有直径大于0.5mm的杂质截留在滤网上。这个过程连续进行直到杂质在过滤器滤网上积累到一定程度，导致压差增加，当压差控制器到达预先设定值（0.035Mpa）时，自动反冲洗开始启动。连接到反冲洗出口的滑动密封片有效地清扫了过滤网的每个部位。过滤器壳体内部压力高于反冲洗出口管的压力，导致一部分海水通过隔离滤网以反方向流动，有效地冲洗了所有累积的杂质，并通过排污阀排到地沟中。
整个操作过程通过压差控制器自动进行。当所有的过滤器网被清洗完毕，自动反冲洗循环停止，过滤器恢复到正常方式直到压差控制器下一次动作，重复进行清洗。
2．设备特点：
- 反冲洗时不需停机，且反冲洗所用海水量很少。
反冲洗采用小功率电动机，体积小，重量轻，维护方便。
● 过滤器上盖可方便拆卸，便于滤网的维修。
● 独特的滤网结构防止杂质堵塞，抗机械磨损和流体冲刷能力强。
● 滤网和反冲洗组件的分离消除了损坏的可能性。
● 进口316L不锈钢本体保证了较强的耐海水腐蚀性能和较长的使用寿命。
● 反冲洗组件的低惯性保证了最低的能耗。
● 排污阀采用电动球阀，反冲洗时球阀自动打开，冲洗完毕后球阀自动关闭。
3．设备规范：
ZHG56-LA型自动反冲洗过滤器，处理水量68m3/h。
三．次氯酸钠发生器：
1．工作原理：
通过电解槽组件的海水被直流电电解，分别在阴阳极上发生如下反应：
阳极反应： 2Cl—2e→Cl2 （1）
阴极反应： 2H2O+2e→2OH-+H2↑ （2）
电解槽极间反应： Cl2+ 2NaOH→2NaClO+H2↑ （3）
次氯酸和次氯酸根统称为有效氯，防海生物污损就是利用电解海水产生的有效氯。
2．设备特点：
电解槽盖：槽盖采用透明的耐紫外线有机玻璃加工制造，操作人员在运行过程中可以透过槽盖直接观察槽内反应情况，有利于直观地判断和掌握电解槽维修和酸洗的时机，便于操作人员管好、用好设备。
电解槽壳体：壳体采用极耐次氯酸钠腐蚀的PVC材料制成，同其它材料相比，具有强度高，耐老化，耐腐蚀等特点，具有更高的安全性和稳定性，消除了液体泄漏问题。
阳极：阳极采用STDN公司专利开发的电解海水专用钛涂贵金属氧化物涂层阳极，即DSA®。针对东南亚海水的特点，STDN公司专门开发了适合其特点的电解海水专用阳极，以确保电解槽在10～35℃温度范围内均有良好的电化学性能和使用寿命，特别是酸洗周期大大延长，同时提高了电解效率。海水中的Mn含量对电极正常使用寿命、电流效率无影响。
阳极为板网式形状，增加了海水的湍流，提高了电解效率。板网状阳极比板式阳极的有效活性面积大，提高了产氯量，阳极和阴极用PVDF隔片保持最佳间距，进一步降低了槽电压，减少了能耗。
阴极：阴极采用哈氏合金制造。哈氏合金在海水和次氯酸钠介质中比钛具有更强的耐蚀性，而且这种合金的析氢电位比钛低0.45V，从而可降低电耗10～15%。该合金板表面抛光，减少了沉淀物的沉积。和钛阴极相比，哈氏合金在大电流工作时，不会产生氢脆，不会出现“析氢腐蚀减薄现象”，克服了钛阴极只能使用4～5年而必须更换的问题，真正地永不损坏。
密封：槽内导电件的密封采用氟橡胶O型圈，壳体和盖的密封用硅橡胶O型圈。这些密封形式和特制密封材料经长期运行证明有极好的密封性能。
金属零件：槽内所有紧固件和结构件的材料均为钛，外部的紧固件为硅青铜。所有紧固件均用扭力扳手按规定的力矩拧紧，保证了密封的可靠性。
导电：电解槽阴极或阳极的导电连接件为钛-铜复合棒，复合棒在槽内部分为钛，在槽外部分为铜。这样既避免了腐蚀，又保证导电良好。槽间电连接采用铜排，拆卸十分简便、快捷。
设计：电解槽内阳极为单极型。电解槽直立放置，海水由下向上一次性高速流过。电解产生的氢气能顺着水流顺利排出，不会在槽内积存。钙镁沉淀物在高流速下减缓了在阴极上的积存，延长了酸洗周期。
2．设备规范：
电流效率： ³83%
直流电耗： £3.76kWh/kg
交流电耗： £4.43kWh/kg
阳极累计使用时间： ³43800h
酸洗周期： ³1080h
电解槽是采用Seven-Trent De Nora公司最新技术制造的SC400/1型单极式网状透明结构的国产海水电解槽。
发生器的结构:
数量: 2套
有效氯产率: ≥65 kg/h.套
阳极寿命: ≥5 年
阴极寿命: ≥20 年
析氯电位 ≤1.13V（S.C.E）
交流电耗 ≤3.76kW•h/kg•Cl2
直流电耗 ≤4.43kW•h/kg•Cl2
电极材料: 阳极采用DSA﹫阳极(进口)
阴极采用哈氏合金C材料
酸洗周期: ≥1080h
3．设备的功能和作用：
电解槽为整套装置的核心部件，通过电解槽的海水被直流电电解产生有效氯，因此电解槽的性能最直接影响整套装置的性能。整套装置共有两组电解槽模块并联，每组电解槽模块是由水路、电路串联的共9个SC400/1型电解槽组成，有效氯产量为65kg/h/套。
四．次氯酸钠溶液储罐：
1．技术要求：
1) 次氯酸钠溶液贮存罐的设计充分考虑气液分离空间。贮存罐的结构便于氢气的安全排放和沉淀物的排出。罐上配备液位计，该液位计具有就地显示和信号远传功能。罐体贮液容积保证满足4小时贮存够单台机组一次冲击加药所需用量加两台机组连续加药10min.缓冲容量之和的1.15倍容量。
2) 次氯酸钠溶液贮存罐室外布置，其材质应采用不透光的耐次氯酸钠溶液腐蚀的材料制造，外壁能抗老化、防盐雾腐蚀。
3) 次氯酸钠溶液贮存罐除具有正常运行所需接口外，还应配有液位测量及控制接口、排污接口、脱氢接口、溢流接口及人孔等。
2．功能和作用：
次氯酸钠储罐主要有以下三种作用：
a． 稀释氢气至1%以下并排入大气中。
B．储存次氯酸钠溶液，在电解单元和加药单元的流量出现不平衡时，保证加药单元连续、正常、稳定地运行。
C．定期排放电解过程中产生的沉淀物。
3．设备规范：
数量: 2台
结构材料: 钢衬胶
结构型式: 立式、锥底、椭圆顶
有效容积: 50m3
附件: 人孔、就地液位指示、药液进口、药液出口、进风口、溢流管道、排污口等
外部连接方式: 法兰
五．加药泵的设备规范：
连续加药泵 冲击加药泵 海水预处理加药泵 反渗透加药泵
数量 3台 2台 2台 2台
结构型式 卧式离心泵 卧式离心泵 隔膜泵 卧式离心泵
过流部分材质 氟塑料合金 氟塑料合金 PVDF 氟塑料合金
适用介质 NaClO溶液 NaClO溶液 NaClO溶液 NaClO溶液
电机 防爆 防爆 防爆 防爆
流量 29m3/h 72m3/h 2m3/h 7.5m3/h
扬程 0.25Mpa 0.25Mpa 0.5Mpa 0.3Mpa
一．酸洗系统：
1．酸洗泵的设备规范：
型号 40FSB-25氟合金泵泵
流量： 3.6 m3/h
扬程： 0.25 Mpa
电机功率： 2.2 kw
2．酸液贮存罐：
数量: 1台
容积: 1.5m3
结构材料: 钢衬胶
结构型式: 立式、平底
附件: 就地液位指示、药液进口、药液出口、酸雾出口、排污口等
外部连接方式: 法兰
3．酸清洗罐：
数量: 1台
容积: 1.5m3
结构材料: 钢衬胶
结构型式: 立式、平底
附件: 就地液位指示、药液进口、药液出口、溢流管道、排污口等
外部连接方式: 法兰
第三节 系统运行及控制
一．系统的运行：
1．系统启动前的检查：
检查各溶液箱，液位计是否正常备用，排污门是否关闭，进出口管连接是否完好备用。
各泵出入口是否正常，管道与阀门，阀兰连接是否正常。
联系电气送电并测电机绝缘合格。
各压力表及仪表一次门是否正常，表计应完好备用。
2．冷却水系统的启动：
确定系统各项正常时，启冷却水泵运行。
3．制次氯酸钠系统的启动：
启海水升压泵；
投自动反洗过滤器运行；
开换热器进出水门；
投发生器运行并调整流量；
当发生器取样管有水流出时，启动整流器并调整电流；
当系统参数稳定后，系统处于正常运行状态，向次氯酸钠贮存罐供药液；
4．制次氯酸钠系统的停运：
将整流器电流调至最小后，停止整流器工作；
停加药系统运行；
停海水升压泵运行；
关相应阀门排出电解槽的电解液；
停冷却水系统运行；
注：以上操作步序不能颠倒；
5．加药系统的运行：
当次氯酸钠贮存罐液位达到适量值时，启动连续加药泵运行；当次氯酸钠贮存罐液位达到另一适量值时，启动冲击加药泵、海水预处理加药泵和反渗透加药泵运行；
当次氯酸钠贮存罐液位达到低位适量值和整流器停运时，必须停加药系统运行或人为视情况停运加药系统；
6．酸洗系统的运行：
在稀酸溶液罐中配置适量浓度的稀酸溶液；
启动酸泵，此时酸系统和发生器间组成一闭路系统对发生器电极进行酸洗；
适量时间，排掉废酸液，在稀酸溶液箱中加水进行水冲洗；
冲洗水水质合格后，停止酸泵运行，关闭相应阀门，发生器酸洗结束
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