How to deal with the dust waste soil produced by asphalt mixing plant?

Introduction to the main process of flue gas treatment of asphalt mixing plant.

1. The dusty exhaust gas discharged by the dryer drum or dryer of the cylinder mixer enters the primary dust collector (inertial separator or cyclone dust collector) through the pipeline, and the coarse particle dust is removed by the primary dust removal;

2. The dusty exhaust gas treated by the first-stage cyclone dust collector slowly enters the bag filter from the air inlet, and the diffused air flow fills the filter chamber of each dust collector;

3. The dust-containing air flow passes through the dust removal filter bag through the negative pressure of the induced draft fan, and the dust-containing air flows through the filter bag while the dust accumulates outside the filter bag;

4. With the continuous accumulation of dust on the surface of the filter bag, when the resistance of the dust collector reaches the program set value, the ash cleaning system periodically sprays high-pressure air from the top of the dust bag, and the filter bag shakes violently, and the dust falls into the hopper, which is transported to the dust humidifier by the screw conveyor at the bottom of the ash hopper, and the dust humidifier mixes evenly with water and stirs to prevent secondary pollution and dust.

5. The clean air filtered by the bag filter is discharged into the atmosphere through the induced draft fan.

With the increasing development of traffic roads, the demand for asphalt mixture pavement paving is increasing; The asphalt mixing plant is a complete set of equipment for the production of asphalt mixture, and the finished asphalt mixture is generally discharged into the asphalt mixture finished material storage bin for temporary storage, and then unloaded into the transport vehicle and transported to the road construction site; When the finished product silo is discharged, it is inevitable that a large amount of asphalt smoke and dust will be generated, and the asphalt smoke contains a variety of organic substances, such as benzopyrene, benzanthracene, carbazole and other polycyclic aromatic hydrocarbons, and most of them are carcinogenic or strong carcinogens; At the same time, the dust is easy to be inhaled into the lungs by the operator, which is more harmful to people; With the continuous improvement of national requirements for environmental standards and the introduction of more stringent acceptance standards, it is the primary issue for asphalt mixing plants to take necessary technical means to reduce or reduce the asphalt smoke and dust in the production process of asphalt mixture, and to make it meet the atmospheric standards and health needs.

However, this method has the following problems: firstly, when the unloading door of the finished product bin is opened, a large stream of asphalt blue smoke quickly fills the entire loading area, seriously pollutes the environment of the mixing site, and the asphalt flue gas cannot be concentrated in the non-open sealing cavity at this time; Second, the extracted asphalt flue gas is ignited and burned by the burner, which not only wastes the asphalt raw material, but also needs to provide fuel to the burner, resulting in high treatment costs; Third, the flue gas after combustion needs to be treated before it can be discharged, otherwise it is easy to produce secondary pollution, high equipment preparation costs and later maintenance costs.

Asphalt ratio such as 5%, it is the quality of asphalt divided by the quality of the stone or divided by the quality of the stone, asphalt, mineral powder according to different mixing equipment is divided into two types: 1, asphalt dosage: stone + mineral powder + asphalt = 100% 2, oil-stone ratio:

Stone + mineral powder = 100% Except for asphalt, it is usually said: oil stone ratio 5% asphalt dosage = 5 105 =

The asphalt smoke of the asphalt mixing plant cannot use the ordinary bag filter. Otherwise, it is easy to block the wax of the dust bag. Asphalt smoke is generally generated in the round and the product is wide and noisy. Generally, electric dust removal and photo-oxygen activated carbon are used!

Summary. There will be a certain amount of pollution.

The dust generated by asphalt mixing can cause air pollution, water pollution, soil pollution, and damage to the health of the mixing plant workers. Dust that enters the inside of the machine can even affect the normal operation of the machine.

Does the dust from the asphalt pavement mixing plant pollute the soil?

There will be a certain amount of pollution, and the dust produced by asphalt mixing will cause air pollution, water pollution, soil pollution, and damage to the health of the mixing plant staff. Dust that enters the inside of the machine can even affect the normal operation of the machine.

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The flue gas of the asphalt mixing plant contains two parts, smoke and gas, and the flue gas temperature is not low. The exhaust gas contained in the flue gas also needs to be treated, and sometimes the flue gas will be accompanied by oily liquid.

The first aspect is that the corresponding dust removal equipment must be set up at the construction site of the asphalt mixing plant. Moreover, the selection and layout of dust removal equipment need to be carried out in strict accordance with certain standards. We can attach the dust collection equipment directly to the diagonal belt hood.

All induced air ducts are also connected to the inclined belt hood to provide space for the dust blown down by the induced air duct to settle, which is effective in reducing the amount of dust directly entering the dust collector. Then at the lower mouth of the dust collector hopper of the dust collector, a pneumatic butterfly valve automatically controlled by the operating system is installed.

Second, in the production process, the dust removal equipment must be carefully inspected and maintained to ensure its dust removal efficiency. This point is very important for the efficiency of the dust removal equipment, but so far, there are still a large number of users of the asphalt mixing plant do not realize its importance, and when the dust removal effect is found to be unsatisfactory, the safety pressure relief valve begins to produce ash, and the dust collector has been filled with dust. Therefore, it is necessary to formulate a reasonable inspection system, arrange certain personnel to inspect and maintain in batches, clean up the dust in the dust removal equipment in time, and replace the parts that need to be replaced in time.

The exhaust gas of the asphalt station is discharged after filtration, and the standard is 20 mg per cubic meter, which is treated by gravity + bag filter.

He also has a concrete batching plant.

[Asphalt on clothing].

If the paint or asphalt is not contaminated for a long time and the dirt has not solidified, it can be washed with turpentine (or benzene and gasoline, etc.). For old stains (solidified), you can soak them in a mixture of ether and turpentine (1:1), wait for the stains to soften (about 10 minutes), then scrub them with gasoline or benzene, and finally rinse them with water.

If the clothes are stained with asphalt, you can first scrape off the asphalt with a knife, soak it in carbon tetrachloride (available in pharmacies) for a while, or rub it in hot water to remove it.

To remove stains such as paint or asphalt, you can still use 10-20% ammonia (you can also add half of the ammonia turpentine) or soak it in 2% borax solution, and then wash it after it is dissolved. The other method is to immerse in benzene or toluene, soak and then wash.

If the nylon fabric is stained with paint, it can be rubbed with lard first, then soaked with detergent and rinsed with water.

Asphalt on a car].

In order to remove the asphalt stuck to the car body, it is necessary to apply car wax, because the wax can dissolve the tar of the asphalt, as long as the car wax is applied repeatedly, the tar that is difficult to remove can be removed. After wiping, wipe again with a clean coarse cloth to thoroughly remove any stains left on the tar body. The original function of car wax is to make the surface of the car shiny, but if it is used as a stain to remove asphalt tar, it is also very effective.