Electric precipitator is a technology that uses the strong electric field generated by high-voltage power supply to generate corona discharge, so that the suspended dust particles are separated from the gas under the action of the electric field force. The following are the electrostatic precipitator technology papers that I carefully recommend. I hope you can feel something! Electric precipitator technology paper part one
Research on the application of new technologies for emission reduction and energy saving electrostatic precipitator
Abstract This article is from The current development status of electrostatic precipitator technology, new technologies for emission reduction and energy saving electrostatic precipitators, and other technologies are elaborated on the application research of new technologies for emission reduction and energy saving electrostatic precipitators.
Keywords emission reduction and energy saving; electrostatic precipitator technology; application; research
CLC number: TE08 Document identification code: A
1. Introduction
With the continuous development of science and technology, in order to better save energy and reduce emissions and reduce pollutant emissions, new energy-saving and emission-reducing electrostatic precipitator technologies have been widely used.
2. Current Development Status of Electrostatic Precipitator Technology
my country’s comprehensive and systematic research and development of electrostatic precipitator technology began in the 1960s. Before 1980, my country was still in a very backward position in the international electrostatic precipitator field. Since the reform and opening up, my country's national economy has continued to grow at a high speed, and environmental protection has become increasingly important to the sustainable development of the national economy. Driven by the interests of the market economy, many large and medium-sized domestic environmental protection industries have continuously increased their investment in technical research and development of electrostatic precipitators, and the application of electrostatic precipitators has achieved considerable development. The country has even included high-efficiency electrostatic precipitator technology in the "Seventh Five-Year Plan" national research projects. Through the digestion, absorption and reasonable reference of imported technologies, by the end of the 1990s, my country's electrostatic precipitator technology basically caught up with the international advanced level of the same period.
After entering the 21st century, our country has vigorously promoted scientific and technological progress, strengthened environmental scientific research, and actively developed the environmental protection industry as an important policy related to economic development, and the environmental protection industry has received further attention. As the country's requirements for pollution control continue to increase, the requirements for dust emissions have also increased significantly. As one of the main equipment for controlling air pollution and resolving the contradiction between environmental protection and economic development, electrostatic precipitator has further developed rapidly in its application technology.
At present, electrostatic precipitators have been widely used in thermal power generation, steel, non-ferrous metallurgy, chemical industry, building materials, machinery, electronics and many other industries. As a major country in the world of electrostatic precipitators, our country is based on the international stage and has entered the international advanced ranks not only in terms of quantity but also in terms of technical level. The electrostatic precipitator technology, from the equipment body to computer-controlled high and low voltage power supplies, as well as insulation accessories, rapping devices, electrode plates and wires, has all been domestically produced, and some products have been exported to more than 30 countries and regions.
Before 1980, the scale of most of my country's electrostatic precipitators was less than 100m2, and its industry share was 32% in the non-ferrous metallurgical industry, 30% in the steel industry, 18% in the building materials industry, 8% in the electric power industry, and chemical industry Industry 5, light industry 4, other industries 0.
With the rapid development of our country’s economy, especially the development of the electric power, building materials and cement industries, which have reached unprecedented levels, by the mid-1990s, the share pattern of the electrostatic precipitator industry had changed to: 72 in the electric power industry , 17 in the building materials and cement industry, 5 in the steel industry, 3 in the non-ferrous metallurgical industry, and 3 in other industries. At present, the usage of electrostatic precipitators in the thermal power generation industry accounts for more than 75% of the national total, and 648m2 of electrostatic precipitators have been successfully operated in 100MW thermal power plants. In the chemical industry, due to the impact of international sulfur prices, the number of companies using sulfur acid production technology to replace pyrite acid production technology has increased sharply since the mid-1990s, causing the industry share of electrostatic precipitators to also drop significantly. Only in the past two years have there been signs of bottoming out.
3. New Emission Reduction and Energy Saving Electric Precipitator Technology
1. Waste Heat Utilization and Efficiency Improvement Technology
In thermal power generation, due to the coarsening of pulverized coal, the Factors such as excessive water content can easily cause the temperature of the smoke emitted by the boiler to be too high, which greatly reduces the working efficiency of the electrostatic precipitator. The impact of excessively high soot temperature on the electrostatic precipitator is mainly manifested in the following:
1) High-temperature smoke will increase the amount of flue gas, and at the same time increase the wind speed of the electric field, causing the processing time of the smoke dust to pass through the electrostatic precipitator. short, reducing dust removal efficiency.
2) High-temperature smoke will also reduce the breakdown voltage of the electric field and increase the gaps between gas molecules, which is not conducive to the collision of electrons, thereby increasing the ionization effect and reducing dust removal efficiency.
3) It is easy to form back corona (partial discharge caused by high specific resistance dust on the dust collector plate), and the dust will fly up again in the morning, reducing the dust removal efficiency.
2. High-frequency power supply technology
The power supply used in thermal power plants is mainly conventional power supply in the industrial frequency band of 50Hz, and the application of high-frequency power supply to electronics, microelectronics and other technologies uses Waveform conversion can meet the power requirements of electrostatic precipitators and has many advantages:
1) Improve efficiency. If a high-frequency power supply is used for the electrostatic precipitator, the electrical characteristics and discharge performance of the high-frequency power supply can be used to increase the efficiency of the electrostatic precipitator many times while reducing flue gas emissions.
2) Energy saving. Also using some characteristics of high-frequency power supply, the efficiency factor of electrostatic precipitator can be increased to 0.9, further saving energy consumption.
3) Small size and easy to use. Due to process limitations in the production of ordinary power supplies, it is difficult to further reduce the size on the existing basis. The high-frequency power supply is small in size due to the technology that integrates the transformer and the control system. It can be installed on the top of the electrostatic precipitator during installation. The integrated feature also determines that it can use fewer cables and save more space.
4) Green and environmentally friendly. The high-frequency power supply adopts a three-phase power supply method, which has little impact on the entire power grid. Its biggest feature is that there is no phase loss and no pollution. At the same time, short circuit, open circuit, over-temperature protection, etc. are added to the circuit design. function, it can be used under very harsh conditions.
3. Sulfur trioxide conditioning technology
Sulfur trioxide is one of the main pollutants in flue gas from thermal power plants. Therefore, if the amount of sulfur trioxide can be reduced in electrostatic precipitator technology, Only by reducing the amount of sulfur trioxide emissions, or further reducing the environmental pollution caused by sulfur trioxide emissions, can we meet the national emission reduction requirements. Sulfur trioxide flue gas conditioning technology can combine a certain amount of sulfur trioxide with a small amount of moisture in the flue gas to form acid aerosol by certain means. This sol can be easily adsorbed on the dust surface when passing through the dust collector, thus Achieve the efficiency of electrostatic precipitator.
4. Low secondary dust technology
Low secondary dust technology is mainly used to solve the problem of secondary dust generated by flue gas under the action of electric wind during the electrostatic precipitating process. The problem of low dust removal efficiency. Low secondary smoke technology mainly includes the following measures:
1) Make certain improvements to the rapping mechanism inside the electrostatic precipitator, optimize the rapping work procedure, and rationally configure the rapping intensity and Eliminate unnecessary vibration to reduce the concentration of secondary dust, allowing the dust accumulated on the plate to aggregate into lumps and fall off.
2) Improve the electric field to overcome secondary dust at high flow rates. Currently used improvements to the electric field mainly include using high-frequency power to reduce corona occlusion and increase the working efficiency of the electric field; adding variable resistance flow grids in the electric field to reduce the amount of dust; increasing the area of ??the electric field to expand the impact on flue gas circulation. Block the scope of action and further reduce the wind speed.
5. Air flow distribution technology
When improving the electrostatic precipitator technology of thermal power plants, research on smoke and dust components was conducted, and a new technology of air flow distribution also emerged.
This technology considers the impact of airflow distribution and concentration distribution on emissions in large electrostatic precipitators.
In order to solve the impact of uneven airflow distribution, airflow distribution technology starts from the most primitive detection analysis and studies the internal structure of the electrostatic precipitator and the installation of the airflow distribution device in the airway. , through a series of experiments to find the reasons that affect the airflow distribution, so as to prescribe the right medicine. This technology mainly uses complex calculations to find correction solutions, which can effectively ensure uniform air flow distribution in the air flow chamber and maximize the efficiency of electrostatic precipitating.
IV. Other technologies
1. Electromechanical multi-duplex dual-zone electric dust collection technology
The conventional electrostatic precipitator dust charging and dust collection functions are Completed in the same electric field, the electric field strength is often limited by the charging voltage, so that the electrostatic precipitator effect cannot be optimally exerted. Here we provide a new product technology of electromechanical multi-duplex dual-zone dust collection electric field with cathode and anode arranged in separate cells and duplex combination. According to the design requirements, 2~3 groups of charging and dust collection cells can be set up along the length of the electric field in a duplex staggered arrangement. .
2. Energy-saving electronic control efficiency improvement technology
Mainly through the analysis, induction and summary of various operating data under different coal types, different working conditions and different load conditions, Compare and analyze the relationship between the electric field dynamic voltammetry curve family and the changes in working condition characteristics, and establish a mathematical model for analyzing and diagnosing different working condition characteristics. Based on this model, the back corona index and normal value of the electrostatic precipitator can be reliably calculated. The corona index accurately reflects the working conditions and changing trends of the entire electrostatic precipitator. Combined with multiple signals such as boiler load, flue gas volume, flue gas temperature, soot blowing signal, etc.; automatically analyzes and diagnoses electric field working conditions; automatically selects the power supply duty cycle and operating parameters of high-voltage power supply in real time; achieves comprehensive energy saving and makes the electrostatic precipitator Always run in the state with minimum power consumption and maximum efficiency.
3. Wet electrostatic precipitator technology
The wet electrostatic precipitator uses the method of washing the electrodes to ensure that the electrodes are clean, and can effectively capture fine dust, remove SO3 and some Heavy metals, etc., are mainly used in normal temperature working conditions such as dust removal in metallurgical environments. When used in wet desulfurization of coal-fired boilers, it can capture escaped PM2.5 fine dust, etc., effectively solve problems such as gypsum rain, and achieve near-zero emissions. However, attention should be paid to equipment anti-corrosion and wastewater recycling.
4. Full-bag technology and electric bagging technology
The full-bag dust removal process is not only technically feasible, but also has the advantages of low investment, less land occupation, and low operating costs. It is New technologies that are in line with my country's characteristics are typical energy-saving and environmentally friendly projects. The electric bagging dust collector is modified from an electric dust collector, which improves the dust removal efficiency of the electric dust collector, which has a great influence on the specific resistance of dust collection and low dust removal efficiency.
V. Conclusion
In general, the continuous development and application of various new technologies have greatly promoted the development of energy-saving and emission reduction technologies, and to a certain extent have reduced The emission of particulate pollutants promotes the improvement of the living environment.
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[2] Luo Rusheng, Liao Zengan, Chen Liyan’s application and analysis of new electrostatic precipitator technology to meet new standards [J] "Electric Power Technology and Environmental Protection" - Issue 4, 2012 -
[ 3] Evaluation, research and application of electrostatic precipitator technology in Gu Fanhua coal-fired power plant [J] "Power Technology Application" - Issue 3, 2013 -
[4] Application analysis of Wenjie's new emission reduction and energy-saving electrostatic precipitator technology [J] "Architectural Heritage" - Issue 17, 2013 -
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