Introduction
Process liquid analyzers such as pH meters, conductivity meters, ORP meters, and density meters play an important role at electrolysis plants in the control of concentrations of various process solutions. This requires both precision and stability under harsh conditions that include highly corrosive substances, high temperatures, and many impurities.
Expected Benefits
- Ensures stable, continuous measurement in heavily contaminated liquids
- Reduces operating costs
- Eliminates the need for manual cleaning
List of Analyzers
| Type | Measurement point | Objective |
|---|---|---|
| pH meter | 1) Supersaturated brine at raw salt dissolver outlet *1 | pH control for impurity removal in brine Control value: 10.8 to 11.0 pH |
| 2) Refined brine *2 | Control of precipitation of impurities Acid range | |
| 3) Brine at electrolysis tank inlet *3 | pH control of electrolysis tank brine inflow: 3 to 6 pH | |
| 4) Return brine at electrolysis tank outlet *4 | Efficiency control in dechlorination tank Acid range | |
| 5) Desalinated water at dechlorination tank outlet *5 | Desalinated water control | |
| 6) Hydrochloric acid plant drainage *6 | Drainage control | |
| Conductivity meter | 1) Supersaturated brine at electrolysis tank outlet *7 | Brine concentration control: concentration: 300 to 320 g/l |
| 2) Refined brine *8 | Refined brine concentration control | |
| 3) Sulfuric acid concentration used for drying in chlorine gas drying line *9 | Concentration control of recovered sulfuric acid: approximately 74 % | |
| 4) Hydrochloric acid concentration in hydrochloric acid plant *10 | Hydrochloric acid concentration control: approximately 35 wt% | |
| 5) Sodium hypochlorite concentration in a soda hypochlorite plant *11 | Sodium hypochlorite concentration control: Available chlorine: 10 to 15 % Residual caustic soda: 0.1 to 1% (approximately 10 g/l) | |
| Oxidation reduction Potential (ORP) meter | 1) Desalinated water at dechlorination tank outlet *12 | Confirmation of dechlorination reaction |
| 2) Soda hypochlorite plant adsorption tank outlet *13 | End control of caustic soda chlorination reaction | |
| Vibration type liquid density meter | 1) Anode solution at electrolysis tank outlet *14 | Anode solution caustic soda concentration control |
| 2) Caustic soda concentration at concentrate drum outlet *15 | Product caustic soda concentration control |
Solution Details
Conclusion
Yokogawa process solution analyzers deliver stable, long-term measurements under the harsh conditions present in electrolysis plants. The FLXA202/FLXA21 Inductive Conductivity Meter is specially designed to detect the concentrations of hydrochloric acid, sulfuric acid, and caustic soda. The PH4C pH Sensor for Chemical Processes can measure pH in a wide variety of processes.
Field Data
Each graph shows a correlation between concentration and conductivity at measurement points, the numbers of which correspond to the ones in the previous page. The ISC inductive conductivity meter's range can be specified, thereby allowing high-resolution measurements in the target concentration range.
The correlation between concentration and conductivity is largely affected by solution temperature. The ISC inductive conductivity meter provides automatic temperature compensation using the build-in temperature sensor.
產業別
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化工
化工廠依靠連續和批量的生產製程，每個生產製程對控制系統都有不同的要求。連續的製程需要一個強大而穩定的控制系統，該系統不能因為自身失效而導致生產線關閉；批量製程的重點在於擁有一個可以靈活調整地公式和程序的控制系統。兩種系統都需要在產品質量記錄中進行管理，並且能夠執行非常規操作。橫河電機憑借廣泛的產品組合、經驗豐富的系統工程師、遍及全球的銷售和服務網絡，為每個工廠流程提供解決方案。
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特種和精細化工
橫河電機長期以來一直為特種和精細化工的客戶提供服務。我們擁有可為您提供卓越可靠性和靈活性的批量解決方案，同時我們還有在設計批量解決方案時可應對各種複雜要求的行業專家。我們承諾在您與橫河電機的合作夥伴關系期間，確保您能夠在保證安全和遵從法規的前提下，生產滿足客戶需求的產品。
相關產品&解決方案
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2-Wire Transmitter/Analyzer FLXA202
The FLEXA™ series analyzers are used for continuous on-line measurements in industrial installations. With an option for single or dual sensor measurement, they are the most flexible two-wire analyzer available.
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Digital SMART SENCOM™ Adapter, SA11
Reusable SMART adapter, requiring only the analog sensor to be disposed of when it reaches the end of its lifetime. With the SENCOM 4.0 platform, Yokogawa delivers reduced costs and waste while contributing to its long-term business goals of a sustainable future for all.
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Flow/NPT Fittings FF20/FS20
Yokogawa has invested considerable design and development time in producing a full range of fittings with particular emphasis on designs that reduce installation and maintenance time and consequently save operation costs.
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FU20/FU24/PH20一體化pH/ORP (REDOX)傳感器
PH20/FU20/FU24一體化pH/ORP傳感器體現了橫河電機如何將“簡單即最好”這句格言應用於傳感器技術。
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Hot-Tap Holder PR10
On-line measurements often present extra challenges, especially when routine maintenance is required. The PR10 is ideally suitable for applications where the sensors must be removed without interrupting or shutting down the process. Without any special tools the PR10 can be retracted safely from the process at pressures up to 5 bar (72 psi). Using the PR10 allows us to place any dissolved oxygen sensor that has a PG13.5 connenction into a retractable assembly.
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工業pH/ORP電極
pH值測量回路的核心是電極系統。橫河電機研發了多種電極，確保電極系統在極其惡劣的條件下也可以運行。
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震動式液體密度分析計 DM8C、VD6
DM8液體密度分析計測量一般工業液體的液體密度，靈敏度高，穩定性好。 測量密度範圍為 0 至 2.0 g/cm3，不受流速和粘度的影響。 除通用sensor，也可選擇衛生型和防爆型sensor。
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pH和ORP傳感器
pH電極和傳感器是進行pH值測量的傳感部分，有伸縮式、流通式、浸入式和直插式等多種安裝選項。選擇合適的pH電極/傳感器對優化測量結果至關重要。
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液體密度分析計
DM8液體密度分析計測量一般工業液體的液體密度，靈敏度高，穩定性好。 測量密度範圍為 0 至 2.0 g/cm3，不受流速和粘度的影響。 除通用sensor，也可選擇衛生型sensor。