A preliminary study on coulomb electrostatic precipitator

A preliminary study on coulomb electrostatic precipitator

Jin Lieshui

Zhuji Environtal Protection Instituge£»Zhuji Kulun Environmental Technology Co.,ltd.

The appellation "coulomb electric" is from the basic theory of electrostatic coulomb's law research to: the size of the coulomb force and continually two is inversely proportional to the square of the distance between the point charge, export to all charged dust particles to force it to dust collecting pole, and the dust collecting around the surface wind speed tends to zero, the soot is offline, fundamentally overcome the second float in the sky. Practical tests show that an electric field with a length of 3.5m, when the inlet concentration is 30g/Nm3, the outlet emission is less than 10mg/Nm3, and the total efficiency is 99.95%.

1. Effect of Coulomb electrostatic Precipitator [1] [2] [3] [4]

"Coulomb electrostatic precipitator" is a kind of high efficiency electrostatic precipitator, which can greatly improve the efficiency of electrostatic precipitator and reduce the weight of the original electrostatic precipitator by about half. The test proves that when the inlet concentration is 30g/Nm3, only a 3.5m electric field can control the outlet emission concentration below 10mg/Nm3. The dust removal efficiency of 99.95% or more, is a major breakthrough in electric dust removal technology, but also on the current bag dust removal efficiency of a beyond. ¡¾5¡¿¡¾6¡¿¡¾7¡¿¡¾8¡¿

2. Theoretical basis of Coulomb esp [9] [10]

The invention adopts the "transparent type dust collector" to replace the "shield type dust collector", the theoretical basis of the research is: the coulomb force of the electrostatic field (F1,2) and the square of the distance between the two point charge (Q1, Q2) (R2) is inversely proportional to the two charge quantity: F,

And the mechanism that the critical flow rate tends to zero when the dynamic pressure of the fluid turns to static pressure, so that the gas flows into the inlet channel from an inlet channel, and then flows out to the side channel, forcing the charged dust particles to approach the positive plate from nearly zero distance, that is, R ¡ú0, then the Coulomb force tends to be maximum, in order to maximize the Coulomb force. Moreover, it can greatly increase specific surface area within limited electric field length, and can catch dust with high specific resistance, almost no escape.

The process flow of flue gas in coulomb electric field is the flow way: the flue gas enters from odd channels, flows through both sides of the plate (transparent plate), and then flows out to the outlet of the even channel. That is, the opening end of the inlet end of the channel with odd numbers is closed, while the opening end of the inlet end of the channel with even numbers is closed and the opening end of the outlet end is closed.

After the airflow enters the main channel, it flows to the transparent dust collector on both sides. The airflow suddenly diffuses into the next channel and then flows out of the electric field end, so the charged dust particles must pass through the transparent dust collector. At the same time also make the surrounding gas dust collecting surface tends to static, presenting the ash is in offline mode, making the dust particles in a state of almost no resistance, shaking and falling dust at this time can't back to come in one of the primary gateways in reverse, at the same time also for export also have corona line in discharge channel, power line also have the effect of pressure dust or the effect of the secondary dust collecting, make the dust into the export Therefore, it can effectively overcome the secondary dust, optimize the combination of the two physical phenomena, and make the turbulent flow formed by the intersecting movement of dust particles in the original conventional electric field no longer exist. Because conventional electrical precipitator its gas flow, was theoretically in each respective channels and dust collecting plate parallel straight line, dust particles almost the distance away from the plate movement and the coulomb's law requirements, and make the channel center layer of dust particles in a velocity field of around 1 m/s towards the end of the electric field, the dust ratio resistance is particularly serious, and the power lines and electric wind direction Form 90. The left and right forces will undoubtedly consume a large amount of electric field corona power, which naturally reduces the dust removal effect. This method has not changed since F.G. Cotrell founded the industrial electrostatic precipitator in 1907 for more than a century, and continues to this day. And has been following Izzy formula (eta = 1 - e - omega f or eta = omega a.) looking for improvements, as far as possible is continually expand the dust collecting area and increase the electric field number, as far as possible to improve all factors that influence the speed becomes omega but overall not izzy formula for breakthrough, also did not see A fundamental change the electric technology, electrical precipitator inevitably along with the environmental requirements greatly increased obviously and itself The relative lag in technology is driving downstream. [11] [12] [13]

The coulomb electric dust removal technology can be directly applied to the selection of the newly designed electrostatic precipitator, and as long as the anode system is changed, all the other structures are the same as the original electrostatic precipitator, including the shell, cathode, vibration, power supply, etc. Therefore, the application of Coulomb electric dust removal technology to electric dust manufacturers is a very good technical update, and will greatly develop the environmental protection market, especially for the transformation of the old electric dust collector, is also an excellent method, as long as the anode system transformation, Can obtain very good effect, and as long as the change of one or two electric fields can achieve and exceed the effect of three or four electric fields, and the export emission is controlled under 30mg/m3 or even 10mg/m3, no matter new or old; Regardless of design, manufacture, installation; Whether it is a form of shell structure are applicable, not only save a lot of investment, and the emission concentration can be far lower than the national standard, so it will be very welcome by users.

4. Application prospect of Coulomb electric dust removal Technology [14] [15]

In recent years, the environmental protection field has thought that the effect of electrostatic precipitator has been inferior to the bag precipitator, because the discharge of electrostatic precipitator is difficult to reach the following 50mg/m3, and the bag precipitator because of its filter material clearance, not only make its application field expanded, but also can make the export emission concentration control in the following 50mg/m3, even 30mg/m3 below! It seriously impacts the living space of electrostatic precipitator and causes the trend of "electric bag" in the field of environmental protection, or carries out the hard transformation of "combination of front electric bag and back electric bag" and "combination of electric bag". [16] [17]

In this severe situation, the invention of Coulomb electric dust removal technology, not only make the export concentration can be controlled in the following 10mg/m3, and to zero emission trend development, this is the challenge to the inherent shortcomings of bag dust removal, and in the total investment, operating costs are far lower than the bag dust collector, this is an epoch-making leap in electric dust removal! It is the miracle and pride of the electric dust industry. [18]

The Coulomb electric dust removal technology has been applied for Chinese invention patents and international invention patents, has aroused the attention of environmental protection circles at home and abroad. Welcome industry cooperation development or transfer, in order to popularize the new technology as soon as possible, more welcome environmental protection management units to apply, to actively promote the development of China's environmental protection cause.

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