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.
行业
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化工
化工厂依靠连续和批量的生产过程，每个生产过程对控制系统都有不同的要求。连续的过程需要一个强大而稳定的控制系统，该系统不能因为自身失效而导致生产线关闭；批量过程的要点在于拥有一个可以灵活调整地公式和程序的控制系统。两种系统都需要在产品质量记录中进行管理，并且能够执行非常规操作。横河电机凭借广泛的产品组合、经验丰富的系统工程师、广泛的销售和服务网络，为工厂流程提供解决方案。
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特种和精细化工
横河电机长期以来一直为特种和精细化工的客户提供服务。我们拥有可为您提供可靠性和灵活性的批量解决方案，同时我们还有在设计批量解决方案时可应对复杂要求的专业人员。我们承诺在您与横河电机的合作伙伴关系期间，确保您能够在保证安全和遵从法规的前提下，生产满足客户需求的产品。
相关产品&解决方案
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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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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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FLXA202/21两线制变送器/分析仪
FLEXA™系列分析仪用于工业设施中的连续在线测量。它是灵活的两线制分析仪，可选择单传感器或双传感器测量。
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FLXA402多通道四线制分析仪
FLEXA™系列分析仪是模块化设计的分析仪，用于在工业设施中进行连续在线测量。可提供单传感器或多传感器测量。
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FU20/FU24/PH20一体化pH/ORP (REDOX)传感器
PH20/FU20/FU24一体化pH/ORP传感器体现了横河电机如何将“简单即好”这句格言应用于传感器技术。
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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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InfraSpec NR800
NR800是一款横河电机生产的FT-NIR分析仪，可用于各种过程和实验室应用，具备出色的可靠性和稳定性。其高波长分辨率、出色的精度和宽扫描范围可提供更高水平的过程信息，可用于更多新领域。它也可以直接将标定模型从实验室转移到过程或在过程之间转移。当然，操作简便和用户友好的软件是NR800的重要设计理念。
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ISC40电感式(环形、无电极)电导率传感器
ISC40型传感器与EXA ISC分析仪组合使用。在可靠性、准确性、可调性和性价比方面，该组合满足甚至优于对电导率测量的期望。
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SC42/SC4A(J)接触式电导率传感器
测量水溶液的特定电导率对于确定水中的杂质越来越重要。横河电机设计了一系列精密传感器和仪器，即使在极端条件下也能应对这些测量。
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工业pH/ORP电极
pH值测量回路的关键是电极系统。横河电机研发了多种电极，确保电极系统在极其恶劣的条件下也可以运行。
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pH和ORP传感器
pH电极和传感器是进行pH值测量的传感部分，有伸缩式、流通式、浸入式和直插式等多种安装选项。选择合适的pH电极/传感器对优化测量结果至关重要。
