A method for treating tail gas of an asphalt mixing plant

Abstract

A method for treating tail gas from a bituminous mixing plant comprises the following steps: (1) cooling tail gas through a spray cooling device to condense out liquid water droplets; (2) sending thecooled tail gas into a demisting device to separate liquid water droplets from the tail gas; and (3) sending the tail gas after demisting into a discharge device and heating by hot gas until the tailgas temperature is higher than the dew point temperature, and then discharging to the atmosphere. According to the system, the spray cooling device is adopted to reduce moisture content of the tail gas generated from the bituminous mixing plant by 70-90%, the demisting device is adopted to separate the condensed liquid water, and the cooled and demisted tail gas and hot gas in the flue are mixed and heated and finally discharged into the atmosphere. The moisture content of the tail gas treated by the system is greatly reduced and the temperature is higher than the dew point temperature; and after the tail gas is discharged into the atmosphere and before the tail gas is fully diffused, the temperature will not drop below the dew point temperature. Thus, no water vapor is formed.

Description

technical field [0001] The invention belongs to the field of asphalt preparation, and in particular relates to a tail gas treatment method of an asphalt mixing plant. Background technique [0002] The aggregate drying process in the asphalt mixing plant will form a large amount of high-temperature, dust-containing, and high-humidity waste gas. The current treatment method for the waste gas is to directly discharge it into the atmosphere after dust removal. However, the temperature of the exhaust gas with high humidity drops sharply when it encounters the cold air in the environment. When the temperature of the exhaust gas drops below the dew point temperature, the water vapor in it condenses into liquid water droplets, resulting in the formation of water vapor at the exhaust port, which is in the environment. It is very easy to appear under the condition of low temperature and (or) high air humidity. Although the pollutants in the exhaust gas have reached the emission stand...

AI Technical Summary

Problems solved by technology

However, the temperature of the exhaust gas with high humidity drops sharply when it encounters the cold air in the environment. When the temperature of the exhaust gas drops below the dew point temperature, the water vapor in it condenses into liquid water droplets, resulting in the formation of water vapor at the exhaust port, which is in the environment. It is very easy to appear in the case of low temperature and / or high air humidity

Although the pollutants in the exhaust gas have reached the emission standards, for ordinary people, they can often see a white smoke area around the exhaust port, so they will mistake a large amount of water mist in the exhaust gas for a large amount of pollutants, resulting in White fog visual pollution, and white fog will reduce the visibility of surrounding areas, causing panic among nearby residents

Images