Introduction
 |
| Flue Gas Desulfurization Process |
In flue gas desulfurization systems that use magnesium hydroxide (Mg(OH)2) slurry, the consumption of the desulfurization agent (Mg(OH)2) is controlled by using online pH analyzers. A great concern in the pH measurement is heavy staining of the pH electrodes by the Mg(OH)2 slurry. To ensure accurate measurement, frequent cleaning of the electrodes with an acid is required, adding to both maintenance workload and cost.
The FLXA AUTO CLEAN chemical cleaning system automates the acid cleaning process, which not only saves both time and expense but also ensures precise pH measurement over long periods.
Expected Benefits
- Improves the efficiency of a flue gas desulfurization system with Mg(OH)2 slurry
- Ensures stable, continuous pH measurement
- Reduces operating costs
- Eliminates manual cleaning
Process Overview
In the flue gas desulfurization system, Mg(OH)2 is used as the absorbent to remove sulfur dioxide (SO2) from the flue gas.
Absorption reaction 1: Mg(OH)2 + SO2 ->MgSO3 + H2O
Absorption reaction 2: MgSO3 + SO2 + H2O -> Mg(HSO3)2
After absorbing SO2, the solution undergoes pH adjustment, oxidation, and filtration for detoxification before discharge.
pH adjustment: Mg(HSO3)2 + Mg(OH)2 -> 2MgSO3 + 2H2O
Oxidation: MgSO3 + 1/2O2 -> MgSO4
Solution Details
Measurement System & Operation Outline
Field Data
When performing pH measurement in a flue gas desulfurization system with Mg(OH)2 slurry, the electrodes tend to become heavily stained by the slurry. The cleaning of the electrodes and the reduction of maintenance time and cost are key points to consider when selecting a pH analyzer for the system.
| pH System with Chemical Cleaning | General pH Analyzer | |
|---|---|---|
| Cleaning | "Automatic acid cleaning: 2 or 3 times/day, user programmable Manual acid cleaning: approx. monthly" | "Manual acid cleaning: once/day" |
| Calibration | Manual calibration: weekly | "Manual 2-point calibration: weekly" |
| Other maintenance | Replenishment of chemical tank: approx. every 2 months | - |
Acid cleaning is done with a 4% hydrochloric acid solution.
相关行业
-
电力
20世纪70年代中期，横河电机推出了EBS电气控制系统，并以此进入电力业务领域。自此以后，横河电机坚定不移地持续提升技术水平和业务能力，旨在为全球客户提供更优的服务和解决方案。
横河电机凭借着全球电力解决方案网络，在充满活力的全球电力市场中发挥着积极的作用。这使得横河电机内部能够进行更紧密的团队协作，将全球资源与行业知识库有机结合。横河电力的行业专家团队通力合作，为每位客户量身打造适合其复杂需求的解决方案。
-
火力发电
以煤炭、石油或天然气为燃料的火力发电在全球发电量中占据主要部分。
-
化工
化工厂存在连续生产与批次生产两种流程，两者对控制系统需求各异。连续工艺要求控制系统具备高稳定性与可靠性，避免因故障导致生产线停机；而批次工艺则强调灵活调整配方、工序等参数的能力。两类系统均需实现产品质量追溯管理，并支持非常规操作执行。横河电机凭借丰富的产品组合、资深系统工程师团队及全球销售服务网络，可为不同工艺流程提供定制化解决方案。
相关产品&解决方案
-
12 mm SC25V pH传感器
SC25V是一款12 mm的pH传感器，包含一个一体型温度元件和一个液体接地电极。
-
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。
-
PH8EFP、PH8ERP、OR8EFG、OR8ERG pH/ORP传感器
横河电机的pH/ORP分析仪可靠性很高，具有多种先进功能且应用广泛，包括在一系列生产过程和中型废水处理厂中进行水质管理，或者用作通用的pH/ORP控制系统。
-
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。
-
pH和ORP分析仪
pH和ORP流量计、分析仪和变送器用于pH和ORP的连续过程监测，以确保水/产品质量，如监测污水排放、批量中和、浆料存储、洗涤塔，冷却塔、化学品、水/废水处理和许多其他应用。
-
两线制双通道变送器/分析仪FLXA202
FLEXA™系列分析仪用于工业装置中的连续在线测量。它们提供单传感器或双传感器测量，是非常灵活的两线制分析仪。
-
两线制变送器/分析仪FLXA21
FLEXA™ 系列分析仪用于工业装置中的连续在线测量。可选配单传感器或双传感器测量，是现有非常灵活的两线制分析仪。
