At present, our factory utilizes a multi-pipe gravity dust collector with 144 side inlets. This system is known for its smooth airflow entry, which minimizes the risk of blockage. However, one major drawback of this type of dust collector is its relatively low efficiency in capturing ultra-fine dust particles. Additionally, due to the variability in daily production conditions—such as changes in raw materials and operational practices—the emissions have occasionally exceeded regulatory limits, leading to frequent complaints about visible yellow smoke. As environmental standards continue to rise, the existing dust removal systems are no longer sufficient to meet the growing demand for cleaner air and better working environments. To address this, we have upgraded the existing multi-pipe dust collectors by adding a single-stage electrostatic precipitator, implementing a two-stage dust removal process that ensures compliance with emission standards.
Throughout the years, from the initial setup of the dust collection system to the present, several modifications have been made, but the results have remained unsatisfactory. Initially, we used a bag filter, which had high dust collection efficiency, but the filters were prone to clogging. Once clogged, the cleaning process through back-blowing was not effective, making it difficult to maintain performance. Later, we switched to a simple tubular electric dust removal device. However, this led to an issue where dust that settled during rapping was re-suspended into the air, creating new particulate matter. After this upgrade, the system's operation became more stable, and the results were significantly improved. The specific improvements include:
(1) According to the regulations issued by the Ministry of Water Resources and Electric Power of the People’s Republic of China, a certain number of online meters must be installed in high-pressure boilers to enhance monitoring capabilities and ensure the safe, stable, and efficient operation of the boiler system.
(2) The accuracy of conductivity and pH measurements has greatly improved compared to the previous manual monitoring methods.
(3) The chemical supervision of the boiler has become more timely, and the adjustment of chemicals is more precise. This helps prevent tube fouling and salt buildup in steam turbines, reduces corrosion of boiler tubes, and extends the lifespan of the boiler, effectively preventing potential boiler explosions.
(4) The system currently addresses the main issue of water vapor monitoring in the furnace. It also takes into account the quality of the external water treatment, laying a solid foundation for real-time water treatment inspections.
In addition, during the design of this system, extensive preparatory work and planning were carried out for the computer networking of the Guangzhou Iron and Steel Group. This has created favorable conditions for improving overall production and management levels. The system has broad application value and can serve as a model for similar implementations in power plants.
One challenge remains: the high temperature at the site, which can reach up to 40°C or higher, affects the stability of the system and reduces the accuracy of the instruments. Therefore, adjustments to the on-site environment are necessary to meet the system’s requirements.
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