Background of dust control in power industry:
At present, the types of dust collectors mainly include electrostatic dust collectors, bag dust collectors, wet dust collectors and cyclone dust collectors, among which electrostatic dust collectors, bag dust collectors, wet dust collectors and cyclone dust collectors are more widely used. The scope of application is relatively limited. The working principle of the electrostatic precipitator is to use a high-voltage electric field to ionize the flue gas, and the charged dust in the airflow is separated from the airflow under the action of the electric field. The negative electrode is made of metal wires with different cross-sectional shapes, called discharge electrodes; the positive electrode is made of metal plates with different geometric shapes, called dust collection electrodes. In recent years, my country's electrostatic precipitators have achieved rapid development and wide application, and the number of production and use of electrostatic precipitators ranks first in the world. Moreover, electrostatic precipitator is still the absolute mainstream dust removal equipment for ultra-low emissions in coal-fired power plants. Statistics from China Electricity Council show that up to now, electrostatic precipitator has a market share of about 66.4% in the dust removal market in the power industry.
Compared with the electrostatic precipitator, the bag filter has high dust removal efficiency, flexible use, simple structure, and low investment, and can be widely used in the dust collection of waste gas such as electric power, cement, metallurgy, and chemical industry. At present, the proportion of bag filter used in steel, aluminum, waste incineration and other industries has reached more than 90%.
Difficulties in dust control in the power industry:
On December 2, 2015, the executive meeting of the State Council decided to fully implement ultra-low emission and energy-saving renovations for coal-fired power plants before 2020. At the same time, the Ministry of Environmental Protection, the National Development and Reform Commission, and the National Energy Coal-fired power plant ultra-low emission and energy-saving transformation work plan" and "Notice on issues related to the implementation of coal-fired power plant ultra-low emission electricity price support policy" and other supporting policies to accelerate the process of ultra-low emission transformation of coal-fired power plants. So far, my country has officially launched a comprehensive coal-fired power plant ultra-low emission work. Ultra-low emission is a systematic project, and there are many challenges in the process of implementation, as well as many problems and "pain points".
The State Council decided to clearly stipulate the implementation time of ultra-low emissions, close to or meet the emission standards of natural gas and gas turbine units, and clarify the emission limits, that is, under the condition of a reference oxygen content of 6%, the emission concentrations of nitrogen oxides, sulfur dioxide, and soot are not equal to Higher than 50 mg/m3, 35 mg/m3, 10 mg/m3.
Description of the dust control plan in the power industry:
Coal-fired boiler bag dust removal is the key environmental protection equipment for power generation enterprises. Our company transforms the electrostatic precipitator into bag dust removal, removes the power supply system of the electrostatic precipitator, does not change the original structure of the electrostatic precipitator shell and the inlet and outlet smoke boxes, and reassembles the original three-layer porous air distribution plate inside the original electrostatic precipitator. Reorganized to make it a dust pre-separation device, which solves the problem of unburned coal particles wearing and burning filter bags. In order to achieve higher emission standards, zero leakage of the clean air chamber and no leakage of the bypass valve are realized. The bag filter in the power plant adopts the compartment positioning reverse blowing mechanism and automatic tensioning device, which is simple in structure and reliable in operation. When cleaning the filter bag, relying on the reverse blowing airflow, it changes the principle of dynamic dust cleaning and realizes static cleaning, thereby improving the filtration efficiency. Bag life. The dust removal equipment of coal-fired power plants adopts the chamber positioning bag dust removal technology, which is different from the introduction and digestion of foreign technologies by other domestic manufacturers. There are obvious advantages. The filter bag protection is more optimized, the dust cleaning system is greatly simplified, the operating reliability of the unit is significantly improved, the operating cost is greatly reduced, and the price is only half of that of foreign products. It is a major invention developed by my country and suitable for China's national conditions. From the design to the product all realize the localization.
Introduction to the effect of the dust control plan in the power industry:
1. You can choose the ash discharge method of ash bucket, ash discharge car, screw discharge device, etc.;
2. Imported PLC is used to control adjustable pulse blowback, and there is no differential pressure display;
3. The equipment has high purification efficiency; it has a purification efficiency of more than 99% for dust with a particle size of more than one micron;
4. The equipment is energy-saving, the running resistance is 500-800pa, the initial resistance is below 200pa, and the highest resistance is 1500pa; (determined according to the wind pressure of the system fan.)
