≥350t / h collection belt conveyor asphalt mixing equipment with 5-7mm swing for vibrating screen
Environmental Index of for batch type asphalt plant
1, according to experimental basis of Xitong and relevant asphalt plants, asphalt smoke every ten thousand cubic meters of asphalt mixture produces approximately 22.3kg. Asphalt fume of the project is about 0.279t / a. Asphalt fume is purified, the purification rate is 95%, and then led into the dryer burning, treatment rate is 95%, the annual emission is about 0.0007 t / a, the emission rate 0.00056kg / h, emission concentration 0.056mg / m3.
2, NMHC content is calculated according to 0.01% of the raw material of asphalt, NMHC of this project is 1.2t / a. Same as above, NMHC after treatment, the annual emission is about 0.003 t / a, the emission rate 0.00024kg / h, emission concentration 0.024mg / m3.
3, referring to "Handbook of harmful substances in the industrial production” volume I (Chemical Industry Press, published in December 1987) and "Organic chemical pollution" (Tsinghua University Press, published in August 1990), Bap per ton of oil asphalt produced during the heating process is about 0.10 ~ 0.15g. The project calculates according to the average 0.125g terms, annual Bap is about 0.0015t / a. Same as above, after Bap been treated, the annual emission is about 3.75 × 10-6 t / a, the discharge rate 0.03 × 10-4kg / h, the emission concentration 0.30 × 10-4mg / m3.
4, the project uses natural gas as fuel, the annual gas consumption is about 2700000m3, based on "The first national census of industrial pollution sources of pollution discharge coefficient Handbook", produced air pollutants as follows: the amount of exhaust gas: 3679 × 104Nm3; SO2 generated amount: 0.108 t / a, concentration: 2.9mg / m3 (gas sulfur content is calculated as 2.9mg / m3); NOX production: 5.052 t / a, concentration: 137.3mg / m3.
Pollution control measures
| Pollutant | Emission mode | Discharge point | Pollution control measures | Expected treatment effect | Remarks |
| Dust |
Unorganized emission changed into organized emission
|
Gravel quarry, vehicle operation area pavement | Dry fog dust removal system makes dust settling; vehicle operation area regularly watering; ground hardened, strengthen job management, not allowed sprinkling |
GB 16297-1996 <Integrated emission standard of air pollutants > Grand 2 standard |
Be up to construction unit |
| Asphalt mixing plant | Adopt fully environmental protection asphalt mixing plant, unorganized emission turned to organized emission with the help of dust cleaner. Environmental protection measures of the equipment please refer to environmental device introduction. | Be up to Xitong company | |||
| Waste material discharging | Adopt waste material wet treatment device or discharge to the tanker. | ||||
| Asphalt fume | Asphalt oil unloading area | Adopt asphalt fume purifying machine, release the purified fume to the furnace chimney. | |||
| Asphalt tank | Adopt asphalt fume purifying machine, release the purified fume to the furnace chimney. | ||||
| Finished material loading area | Adopt closed channel for collecting asphalt fume, purified fume by the purifying machine will be burn in the dryer, then release 20meters to the ground. | ||||
| Smoke | Organized emission | Chimney | Use gas as the fuel, release 20meters to the ground. | ||
| SO2 | |||||
| NOX | |||||
|
Noise
|
Mixing devices, operation vehicles | Equipment related part sound insulation treatment |
Factory boundary: Daytime 65 dB Nighttime 55 dB |
Be up to construction unit/Xitong company |
