| Electrostatic Precipitator (ESP) |
| An ESP is an efficient particulate removal device, with a low equipment pressure drop (< 300 Pa) and high operation stability. It is suitable to dust removal with large flue gas flow rates, and is widely used in the flue gas treatment applications in coal-fired boilers and power plants, iron and steel industry, and metallurgical processes. |
| Particulate Removal Mechanism |
· High voltage is applied to create an electrical field, which produces an electric corona discharge that ionizes the gas around the electrode;
· The electrons and ions contact and charge the dust particles;
· Charged dust particles move towards the collection electrode under the electrostatic force;
· Dust particles are collected on the electrode plate and are released to the hopper by the rapping system;
· The dust collected is carried out by the conveying system. |
· Particulate removal efficiency: > 99 %
· Outlet particulate content: < 30 mg/Nm3
· Pressure drop: < 300 Pa
· Equipment utilization: > 98 % |
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| The baghouse dust collector has the advantages of high particulate control efficiency, operational stability and ease of operation and maintenance. The efficiency of the baghouse is not affected by the dust properties or operating conditions, and it is widely used in iron and steel, smelting, chemicals, food, and power industries. |
| Particulate Removal Mechanism |
· The particulate removal mechanisms are based on inertial collision, screening, dispersion and blockage;
· Flow velocity decreases after entering the baghouse, and larger dust particles fall into the hopper under gravity;
· Dust particles are collected on the surface of the filtration bags, while clean gas goes through the filtration bags and is discharged;
When the differential pressure across the filtration bags reaches the preset value, the cleaning mechanism will be activated to blow off the dust stuck to the surface of the filtration bags. |
· Particulate removal efficiency: > 99.9%
· Outlet particulate content: < 20 mg/Nm3
· Pressure drop: < 1,200 Pa
· Equipment utilization: > 98%
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| Electrostatically Enhanced Baghouse |
| The electrostatically enhanced baghouse takes the advantages of the ESP and the baghouse and improves the adaptability and reliability of the baghouse filtration system. The electrostatically enhanced baghouse maintains a high particulate control efficiency when operating in conditions with large variations in coal type and boiler load. |
| Particulate Removal Mechanism |
· High particulate removal efficiency is achieved by taking the advantages of ESP and baghouse;
· More than 80% of the particulates are removed electrostatically, significantly reducing the filtration load on the baghouse;
· ESP functions as a spark trap to prevent damage to the filtration bags from high-temperature dust particles;
· Due to the reduced filtration load on the baghouse, service time between dust-cleanings is increased and thus the lifetime of the filtration bags is effectively extended. |
· Particulate removal efficiency: > 99.9%
· Outlet particulate content: < 20 mg/Nm3
· Pressure drop: < 1,000 Pa
· Equipment utilization: > 98%
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| The wet dust scrubbing system is an ideal solution for treating highly adhesive dust and can be operated under high temperature or high-humidity conditions, where the ESP and baghouse dust collectors cannot be effectively applied. Wet dust scrubbing is especially suitable for treating FCC flue gas in refineries. The wet dust scrubbing process is not affected by the specific electrical resistance of the dust particles and maintains a high particulate removal efficiency when operated in conditions with variations in coal type and boiler load. |
| Particulate Removal Mechanism |
· Larger dust particles are washed off in the spray pre-scrubber.
· Fine particulates are agglomerated in the cooling section through condensation and nucleation.
· The demister removes agglomerated particulates. |
· Particulate removal efficiency: > 99%
· Outlet particulate content: < 30 mg/Nm3
· Pressure drop: < 500 Pa
· Equipment utilization: > 99% |
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