Comparison of electrostatic dust removal and bag impulse dust removal technology

Comparison of electrostatic dust removal and bag impulse dust removal technology

Comparison of electrostatic dust removal and bag impulse dust removal technology

Electrostatic dust removal and bag impulse dust removal comparison

Two major technologies are mainly used in the plants for dust and smoke removal: electrostatic dust removal technology and bag impulse dust removal technology.

The two types of technology comparison is as follows:

1. Dust removal efficiency

From the cleaning mechanism, the electrostatic dust collector is adsorbed by the charged particles to remove, but about 1 micron particles lie in the field charge and diffusion charge mixing area, its charging capacity is poor, and therefore difficult to remove, there are studies that show the removal efficiency of PM2.5 particles is about 85-92% for electrostatic dust collector.

The efficiency of dust removal is higher than that of electrostatic precipitator, and the removal efficiency of PM2.5 particles is more than 99.5% because of the common effect and dust removal mechanism of the bag filter.

For practical applications, the domestic operation of the electrostatic precipitator efficiency can reach 99.5%, that is, emissions in the 100 \ nmg / Nm3 or so, although the recent emergence of high-frequency power supply improvements, mobile plates, electric coagulation and other new technologies, The initial discharge concentration of the project can be less than 30 mg / Nm3 in some demonstrations.

Domestic bag dust collector outlet dust concentration is usually less than 20 mg / Nm3, back blow bag dust removal project is mostly in the 10 \ nmg / Nm3 or so, and its decision by the dust removal mechanism, dust efficiency and stability, long-term stability Standard.

2. Energy saving situation

Electrostatic dust collector and bag filter power consumption occupied the larger proportion of common electricity, whose electrostatic precipitator need to form a high voltage electric field, the main energy consumption for the rectifier transformer energy consumption, can account for 0.3-0.5% of full load power generation, and this energy consumption does not decrease with the load of the random group.

Bag dust collector through the filter bag will form a certain resistance, the main energy consumption for the fan to overcome this part of the resistance and increase the energy consumption, with the technical improvement, the filter bag resistance can be control under 1000Pa for long time (three years), at full capacity when the energy consumption of about 0.2% of the amount of electricity, and this energy consumption with the unit load will be more greatly reduced.

According to China’s current actual operation, with a 300MW unit dust remover project, for example, after the transformation of the sub-room backpack bag filter than the previous three electric field electrostatic precipitator energy saving 4 million KW.

Taking into account the improvement of environmental standards, electrostatic precipitator at least five electric field is expected to reach the standard, the energy saving can be up to 8 million KW.

3. Steel saving

Electrostatic precipitators require steel plate to form a high voltage electric field, which consumes more steel than a bag dust collector. Take one of China’s first 600MW unit bag filter project – Shanxi Zhangshan Power Plant 600MW unit sub-blowing bag filter, for example, the amount of steel is only 1479 tons / set, compared with the original design electrostatic precipitator, can save steel 2121 tons / set.

4. Operation and maintenance

During the operation, the electrode pole of the electrostatic precipitator is prone to buckling deformation, resulting in the reduction of dust removal efficiency. Environmental protections requirement are low, the electrostatic precipitator by the power plant that is maintenance-free equipment, with the environmental protection high requirements, the plate line maintenance become a technical problem.

During the operation, the bag filter, such as the emergence of broken bags, can be achieved at full load online maintenance, will not lead to excessive export dust. A

t the same time with the filter bag material and processing technology improvement, and the anti-blown cleaning technology improvements, the current number of sub-room backpack bag dust bag project bag life can be up to or more than 4 years, further reducing the plant maintenance work quantity, reduce the operating costs of plants.

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