At present, with the introduction of a series of environmental protection policies, the emission standards of flue gas have become more and more stringent. The electrostatic precipitator's dust removal effect has to meet the dust emission standards. Therefore, its application is facing severe challenges. How to improve dust removal efficiency through electrostatic precipitator technology innovation has been a major issue in the field of flue gas dust purification. In order to achieve this goal, it is necessary to further deepen the theoretical basis of dust removal, invent a new and efficient electrostatic precipitator, to study effective measures to reduce the anti-corona of high specific resistance dust and to develop surface modification technology of the dust-collecting electrode plate Actively explore the practical dust collection technology, which is of great significance for the realization of energy-saving emission reduction in the field of dust purification of flue gas. Development of Electrostatic Precipitator Technology Due to its advantages of high efficiency of dust removal, low running resistance, large amount of flue gas and less energy consumption, electrostatic precipitator has attracted much attention and quickly occupied the dust market. With the continuous rapid economic development and the improvement of environmental protection standards, all countries have conducted in-depth studies on the application technologies and equipment of ESPs, and achieved certain results. Wide range electrostatic precipitator. As early as 1977, Cooperman in the United States studied the influence of the wide pole pitch on the airflow of dust by using the gradient relation, and provided a sufficient theoretical explanation for the improvement of the dust removal efficiency with wide polar distance. In 1980, H.Hoegh-Petersn doubled the channel on the original equipment, using a 400mm pitch, and maintained the same field strength. Experimental results show that the wide pitch technology can reduce the power consumption and improve the dust removal efficiency. The wide pitch improves the dust driving speed by 1.05 ~ 1.40. Meanwhile, it has obvious superiority to high specific resistance fly ash treatment Sex. Since the 1980s, scholars in our country have also made some researches on wide-gap electrostatic precipitators. Wide range electrostatic precipitator efficiency, low resistance, low supplies and other advantages have been generally recognized. However, at the same time, the current density of the wide-range electrostatic precipitator is low, the charging of the dust is slow and not sufficient, the cost of the rectifying device is high, the investment of the power supply device is too large, and the area of ​​dust collection is correspondingly reduced. Therefore, in actual production are also subject to certain constraints, the need for different conditions, through economic and technological comparison to determine the optimal spacing. Mobile Electrode ESP (MEEP-ESP). Mobile electrode technology successfully solves the problem of difficult to remove the high specific resistance fine dust deposited on the dust collecting plate by the rapping method. The basic principle is that the dust collecting plate can be made to move up and down the form, and then rotate the brush in the lower ash bucket to brush the trapped dust, and always keep the dust collecting plate surface is relatively clean, and cleaning Non-airflow area, thus effectively preventing the formation of anti-corona and dust flying secondary flying occurred to ensure efficient dust removal. At present, several companies in our country have independently developed similar technologies and have tried out several projects in good condition and are making further improvements. The practical application at home and abroad shows that MEEP-ESP is not only suitable for the high specific resistance dust, fine dust and viscous dust difficult to be collected by the conventional ESP, but also is especially suitable for burning special refractory coal and variable coal kiln The generated dust, as well as the limited space of the equipment, can achieve high dust collection efficiency with a relatively small dust collection area and achieve relatively large economic benefits with relatively less equipment investment. Cohesion technology. In recent years, the coalescence technology is an effective measure to remove the fine particles in the flue gas to improve the performance of dust removal. The main idea of ​​this technology is to install a condenser at the inlet flue with a length of 5m on the front of the precipitator, which is a pretreatment device for high-speed flue gas to enter the precipitator. The agglomerator consists of a set of parallel channels with positive and negative phases. When the flue gas and dust pass, positive and negative charges are obtained respectively. When different channels of flue gas enter the precipitator, they are mixed together. Positive charged fine particles Mixed with negatively charged coarse particles flowing from adjacent negative polarity channels while the negatively charged fine particles are mixed with the positively charged coarse particles to reduce the number of fine particles to form a more easily removable Dust particles to improve dust removal efficiency. High-flow flue gas enables its grounding plates to be clean without the need to vibrate as an electrostatic precipitator, saving maintenance costs. For a 100MW generating unit, the condenser needs only about 5kW of power. For the induced draft fan, increasing resistance but 200Pa. As the investment, operating costs and maintenance costs are low, cohesion technology has broad application prospects. Electric bag composite dust collector. Combined with other dust removal mechanism to improve the performance of the joint dedusting method has great advantages, it can overcome the adverse factors when a single precipitator, so as to avoid weaknesses, complement each other. The most common is the combination of electrostatic precipitators and other dust removal ESP, of which, ESP bag filter is the most effective one. In the late 1980s, the COHPAC electric bag was developed by the Palo Alto Electric Power Research Institute in California, USA, mainly as an improvement on ESP. The program is to add a bag filter downstream of the original ESP, to maintain dust concentration less than 10mg / Nm3. An environmental protection company in China in 2002 in Shanghai Pudong Cement Plant, a Nissan 1000t rotary kiln tail with 70m2ESP converted into a series of electric bag, the flue gas treatment capacity of 240000m3 / h, retaining the original electric field first precipitator (Anode side of the rapping technology), the second and third electric field to bag dust (long bag low pressure pulse technology), the electric bag on April 2, 2003 put into operation, the emission concentration long-term stability below 30mg / Nm3. With the increasingly stringent environmental standards in China, electric bag as a new type of dust removal equipment to improve the ESP dust removal efficiency and effective control of fine dust, showing a strong advantage, it is not only suitable for new projects, but also particularly suitable for the transformation of the old ESP.
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