Application of Baghouse Dust Collectors in Boiler Tail Gas Treatment of Coal-Fired Thermal Power Plants

Baghouse dust collectors are highly efficient, stable and reliable, making them widely applicable in metallurgy, building materials, chemical engineering and other industries. 

As dry dust filtration devices made of woven filter cloth and non-woven felt, they leverage the filtration performance of fibrous fabrics to purify gas. 

When dust-laden gas enters the collector, large dust particles settle down due to gravity as their specific gravity increases, while fine dust is retained by the filter media during passage, achieving effective gas purification.

The entire filtration process is divided into two stages: first, the fiber filtration stage, where dust particles accumulate gently within the fibers. 

As filtration proceeds, a dust layer forms on the fiber surface, enhancing the overall filtration effect. Second, the surface unsteady-state filtration stage. The dust layer on the fiber media surface captures more dust particles, 

but the continuous accumulation of dust on the filter media significantly impacts the collector's efficiency and increases its operating resistance. 

Therefore, dust cleaning must be performed when the resistance reaches a preset threshold.

Application Characteristics of Baghouse Dust Collectors in Coal-Fired Power Plants  / Adaptability to complex working conditions of power generating units

Baghouse dust collectors can adopt a multi-channel parallel design to ensure the stable operation of power generating units, and single channels can be switched for maintenance independently, 

enabling effective response to the complex operation of dust removal systems and steady improvement of work efficiency. Equipped with dust pre-coating devices and water spray cooling devices inside,

 they form a protective dust layer on the filter bag surface to safeguard the bags, and the cooling devices reduce excessive flue gas temperature to prevent filter bag damage. 

This allows the collectors to adapt to the actual operation of power generating units and meet the requirements of diverse and complex working environments throughout the process.

Scientific air intake mode

Large baghouse dust collectors feature a scientific air intake design that reduces equipment operating resistance, typically adopting a side air intake mode. The intake airflow guides dust settlement and distributes evenly, 

delivering excellent dust removal results. Additionally, the horizontal airflow inside the filter bags has a low velocity, which aggregates the dust dislodged during cleaning, reduces dust re-adhesion, 

ensures optimal cleaning efficiency and avoids excessive equipment resistance.

Compliance with standard flue gas emission requirements

Based on filtration dust removal principles, baghouse dust collectors have strong adaptability and high dust removal efficiency, effectively capturing various particulate matter including hard-to-collect dust particles. 

They are suitable for gas with a wide range of dust concentrations, unaffected by the properties, concentration and type of flue dust, as well as fluctuations in flue gas velocity.

 In contrast, electrostatic precipitators used in coal-fired thermal power plants are sensitive to coal type changes, and their dust removal efficiency is compromised by dust resistivity.

Collection of fine particles and heavy metal elements

Baghouse dust collectors effectively capture fine particles and heavy metal elements in flue gas. With the development of modern industry, flue gas emissions have severe impacts on atmospheric environment, 

human health and skin, making the control of fine particulate matter an essential requirement.

Multi-compartment offline cleaning technology

The multi-compartment offline cleaning function of baghouse dust collectors ensures minimal air volume fluctuation of the system, which not only maintains the stable and normal operation of boilers 

but also reduces the difficulty of filter bag leak detection during use.

Advanced clean air plenum observation window

Observation windows installed on the exterior of the clean air plenum enable detailed observation and real-time monitoring of the internal conditions of the plenum, ensuring the stable operation of the equipment.

Online switchover and maintenance function

Safety production and environmental protection are crucial in thermal power generation, and baghouse dust collectors support online switchover through a multi-channel combined design.

 Each channel is equipped with inlet and outlet valves, dividing the collector into independent units that can operate separately. During filter bag maintenance, the inlet and outlet valves of the relevant channel 

can be closed and the system can switch to other channels to realize offline maintenance, without interrupting the stable operation of power generating units.

Cost reduction and energy saving

The operating costs of baghouse dust collectors mainly include filter bag replacement costs and increased energy consumption caused by rising resistance, which leads to higher shaft power consumption of induced draft fans.

In comparison, electrostatic precipitators mainly consume electricity for their electric fields. According to the correlation curve of electrostatic precipitator efficiency and corona power in China, 

when the dust removal efficiency of electrostatic precipitators exceeds 99%, the electric field power consumption increases significantly, even higher than the shaft power consumption of baghouse dust collectors. 

To meet emission standards, electrostatic precipitators also need to maintain a dust removal efficiency of 99%, making baghouse dust collectors a more cost-effective option for achieving high dust removal efficiency.