Dust treatment efficiency at EVN thermal power plants is over 99.6%

The issue of ensuring the environment during the operation of coal-fired power plants in Vietnam is increasingly concerned and effectively implemented. Currently, Vietnam Electricity (EVN) owns and operates 12 coal-fired power plants, including thermal power plants in the North 60-210km from the East of Hanoi, and factories thermal power plant in the South is 200-300km from Ho Chi Minh City. In the process of investing in thermal power plant projects, EVN has carried out the impact assessment, analyzed the impact of the project on the surrounding environment and is shown in the Assessment report. the environmental impact is assessed and approved by the competent State Management Authority. Coal-fired thermal power plants are invested with modern and highly efficient environmental treatment technology such as: ESP system for electrostatic dust filtering, SOx elimination, NOx ..., meeting Vietnamese environmental standards. Male. To assess the spread of scattered dust in the air environment, the Environmental Impact Assessment reports used a calculated model (AERMOD, CALPUFF, ...) recognized by the world and applied to Diffuse simulation of dust concentration in air.

In order to assess the cumulative and resonant impacts of thermal power plants on the surrounding environment, the Ministry of Industry and Trade has also reported and studied the integrated environmental impact of the power centers of Vinh Tan and Duyen. Hai. CALPULL model was used to evaluate the diffusion level of dust concentration in the air.

The model results all show that the largest influence level of dust concentration (about 30 mg / m3 for total TSP dust and 10 mg / m3 for PM10 fine dust) usually occurs at the distance of the plant from 2.6. -2.8 km and drops very quickly at longer distances than the factory. At a distance of 5km-10km or more, dust concentration due to the impact of the thermal power plant is almost no longer affected (an increase of 1-5 mg / m3 compared to the standard of 200 mg / m3).

To ensure the minimum concentration of dust released into the environment, all coal thermal power plants of EVN (12/12) have invested and installed electrostatic dust filtration systems (ESP) with efficiency dust treatment reached over 99.6%.

The ESP (4-pole) electrostatic dust treatment system will be installed separately for each unit with the following principle of operation: the ash particles are passed through the electrodes discharging in the high-voltage field and being charged with an electric charge. negative and will be absorbed and retained by metal collectors with the anode electrode. Dust particles on the pole will be periodically deposited by a rapping system and dropped to the ash collection hopper below the floor of the ESP filter and sent to the ash silo by a pneumatic system. and is poured onto specialized vehicles to go to the consuming facility as construction materials.

Electrostatic dust treatment technology of thermal power plants is using modern technology, with high reduction efficiency not inferior to factories in the region and the world, meeting environmental requirements well.

In addition, thermal power plants are equipped with automatic continuous monitoring systems (24/24) pollution parameters in exhaust gas and wastewater, and the resulting data is sent online to the Departments. Local Resources & Environment, and EVN to monitor and check.

After checking the dust concentration monitoring data in thermal power plants, the dust concentration in the exhaust gas is low, meeting QCVN 22: 20009 / BTNMT and complying with the environmental impact assessment. Browser. The resulting data are equivalent to the observed dust concentration monitoring results 3–6 months ago and there is no sign of increased dust emissions.