Low-temperature electric dust removal technology for thermal power plant charity

Following the wet electrostatic precipitator to become a new standard for dust control in coal-fired power plants to effectively control the PM2.5 focus, a new technology with new concept and excellent performance --- a breakthrough has been made in the technology of low-temperature electrostatic precipitators, The successful application of this technology in China's large-scale coal-fired power plants can be described as a timely response to the power plant charcoal.

As we all know, our country promulgated and implemented the "thermal power plant air pollutant discharge standards" is the most stringent international standards. As the mainstream of dust control equipment for thermal power plants, the majority of power plants, power design institutes and environmental impact assessment departments are looking forward to the new electrostatic precipitator technology that can meet the requirements of governance. Fujian Longjing Environmental Protection Co., Ltd., the leading environmental protection company in China, has successfully developed such a Both to meet the low emissions, but also save energy and heat, and efficient capture of SO3, wet desulfurization and other favorable wet energy saving and other functions of waste heat utilization of high efficiency low temperature electrostatic precipitator, and the product is applied to 600 MW unit large Coal-fired power station.

July 13, Fujian Provincial Economic and Trade Commission held in Fuzhou City, appraisal of provincial-level new products from China Power Engineering Consultants Group Corporation, Environmental Engineering Assessment Center Ministry of Environmental Protection, Beijing Institute of Labor Protection, Chinese Academy of Sciences Guangzhou Institute of Energy, Northwest Electric Power Design Institute, East China Electric Power Design Institute, Huaneng Power International, Datang International unit experts such as the appraisal committee on the development of Longjing environmental protection "LSC waste heat utilization of low temperature and high efficiency electrostatic precipitator" were reviewed, appraisal committee of new products Development and application to give a high rating, that the product is a domestic initiative, its comprehensive performance and technological level has reached the current international advanced level.

Not afraid of high standards take the initiative to innovate

Low-temperature electric dust removal technology is an advanced and efficient flue gas treatment technology in the world. In 1997, Mitsubishi Japan took the lead in testing low-temperature electric dust removal technology based on MGGH (Zero Leakage Gas-to-Air Heat Exchanger) to operate the electrostatic precipitator at 90 degrees Celsius . In view of the obvious advantages of this technology, the rapid development in Japan, Mitsubishi, Hitachi and other ancillary units have accumulated over 13,000 megawatts capacity. ESP is the most important dust removal equipment in our country. However, the dust removal efficiency is affected by the change of coal type, and the efficiency of dust removal by the high specific resistance dust counter-corona is more obvious, which makes it difficult to meet the strict emission standards. The majority of power plants on ESP really "love" and "worry." Especially due to the fact that a large number of coal-fired power plants in our country are generally hotter than the designed value, the flue gas volume flow rate increases, the dust-dust ratio resistance increases the dust removal efficiency, the power consumption of the induced draft fan increases, and the water consumption of the wet desulfurization and cooling Increase, power generation costs and other issues.

ESP to meet the new standards to achieve low emissions, there must be a new breakthrough in technology. How to break? From the solution to the bottleneck problem of ESP application start. Dragon Huang, general manager of environmental protection, told reporters Huang Wei, as early as 2006, Long net environmental protection began to pay attention to low-temperature flue gas treatment process and send technical personnel to visit Japan. In 2007, Longjing Environmental Protection established a project team to do a lot of work in the research and development of new technologies.

Long net environmental protection of low-temperature electric dust removal technology has chosen a waste heat recovery flue gas boiler with a new low condensate condensing process line. The project team first carried out research on the relationship between flue gas temperature, specific resistance and electrostatic precipitating efficiency, breaking through the key technologies of reducing the specific resistance and improving the dust removing efficiency. Secondly, adopting the system integration design method, the waste heat utilization and electrostatic precipitator Of the organic combination, especially the waste heat utilization of heat exchange device and the import of electricity dust removal uniform integration of the device. In this way, the heat exchange tube bank also serves as a uniform device for the flue gas stream, so that the flue gas entering the high-voltage electric field is more evenly distributed and the pressure loss of the body is lower. Third, independent development of "two-dimensional auxiliary heat transfer" as the property of the film tube and fin tube fin tube heat transfer device to improve the heat transfer efficiency and high reliability.

Fourth, research and development of smoke temperature regulation and low temperature electrostatic precipitator adaptive control system can automatically adjust the total amount of flue gas heat exchanger and flue gas temperature after the heat so that the low temperature electrostatic precipitator can be stabilized in the best state of work. In addition, the dragon net also jointly carry out the relevant institutions of high temperature corrosion resistance of materials used in ESP and SO3 capture effect test.

Long net environmental research and development of "LSC waste heat utilization of low temperature and low temperature electrostatic precipitator," Datang International Ningde Power Generation Co., Ltd. No.4 furnace 600 MW units more than a year of application, the third party testing, the average heat transfer cooling rate reached 50 degrees Celsius above the dust emissions from 60 mg / standard cubic meters down to 20 mg / standard cubic meters, SO3 removal rate reached 73.78% (after a heat exchanger). This is a set of high-efficiency flue gas treatment new products that combine flue gas cooling, high efficiency dust removal, energy saving and synergistic removal of sulfur trioxide. Currently the core technology of the product for a total of 6 patents, has made one invention patent and three utility model patents.

Energy-saving emission reduction effect is remarkable

Waste heat utilization of low-temperature dust collector can bring some tangible benefits to the power plant? How to reduce energy consumption? Long net environmental assistant manager Liao Zeng An interview said that the use of waste heat after the use of high-efficiency low temperature electrostatic precipitator will make the electric dust into the ESP temperature from 120 to 160 degrees Celsius down to 90 to 100 degrees Celsius low temperature, flue gas Temperature work in the acid dew point, which can bring the benefits of five areas: First, flue gas temperature decreases, the soot resistance also decreases, is conducive to improving the efficiency of electric dust collection; the second is the flue gas temperature decreases, the flue gas The corresponding decline in the amount of wind, electric dust reduction electric field wind speed is conducive to PM2.5 fine dust capture; third is to achieve waste heat recovery and utilization of flue gas to save coal consumption.