Yankuang International Coking No. 1 Boiler Electrostatic Precipitator Conversion to an Electrostatic-Bag Hybrid Dust Collector Project

Yankuang International Coking No. 1 Boiler Electrostatic Precipitator Conversion to an Electrostatic-Bag Hybrid Dust Collector Project

Case study

The project to convert the electrostatic precipitator of Boiler No. 1 at Yankuang International Coking into a combined electrostatic-bag dust collector was carried out entirely by Haihui Group, from the initial design and equipment manufacture through to on-site installation and system commissioning. This project represents a significant practical achievement for Haihui Group in the field of boiler flue gas treatment within the coking industry, fully demonstrating the company’s comprehensive technical capabilities and project execution capacity in this sector.

Prior to the retrofit, the original electrostatic precipitator had experienced a significant decline in dust removal efficiency due to prolonged operation and equipment ageing, making it difficult to meet increasingly stringent environmental emission standards. Upon undertaking the project, Haihui Group’s technical team conducted an in-depth on-site survey and, taking into account the boiler’s actual operating conditions, formulated a scientifically sound retrofit plan for the electrostatic-bag composite dust collector. While retaining the original shell structure, the front-stage electrostatic field was retained as the primary dust removal unit, whilst the rear stage was converted into a baghouse unit, thereby fully leveraging the synergistic advantages of electrostatic and baghouse dust removal: the front-stage electrostatic precipitator captures large dust particles, reducing the load on the rear-stage filter bags; the rear-stage baghouse ensures ultra-low emissions. Following the retrofit, the equipment operates with low resistance, the filter bags have a long service life, and emission concentrations consistently meet regulatory standards.

Throughout the project implementation, Haihui Group strictly adhered to its quality management system, ensuring that every stage—from raw material procurement and manufacturing to final factory inspection—was carried out in accordance with standard operating procedures. During the on-site installation phase, the construction team overcame challenges such as limited site space and tight deadlines through meticulous organisation and scientific construction methods. Following commissioning, testing by a third-party inspection body confirmed that the equipment’s particulate emissions fully complied with national and local environmental emission standards. The project successfully passed the acceptance inspection organised by the client and received high praise from the client.

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