Introduction
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| 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.
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；批量过程的重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、遍及全球的销售和服务网络，为每个工厂流程提供解决方案。
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火电
使用煤、石油或天然气作为燃料的火力发电占全世界发电量的大部分。
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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卓越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各种复杂要求的行业专家。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。
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电力
电力
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