Drying device and asphalt station

Abstract

The invention provides a drying device and an asphalt station. The drying device comprises a reducing agent storage tank, a pump, a drying drum, a combustor and a spraying device; the input end of thepump is communicated with the reducing agent storage tank; the combustor is arranged in the drying drum; and the spraying device is communicated with the output end of the pump and is arranged in thedrying drum. During the use of the drying device, the combustor is used for drying a cold material by combusting heavy oil, and the pump is started in the process; the pump pumps a reducing agent inthe reducing agent storage tank to the spraying device; the spraying device sprays the reducing agent out; the reducing agent and nitrogen oxide generated by the heavy oil combustion of the combustorcan be subjected to a reduction reaction, so that nitrogen and water are generated, and therefore, a nitrogen oxide in waste gas generated by the combustion of the combustor are removed, and the content of the nitrogen oxide in the waste gas is reduced.

Description

technical field [0001] The invention relates to the field of asphalt station drying, in particular to a drying device and an asphalt station. Background technique [0002] Asphalt mixing plants usually use heavy oil as fuel, and the fuel consumption in their operation is huge. Due to the nitrogen content of the fuel itself, the high flame temperature, and the large excess coefficient of oxygen in the combustion atmosphere during the combustion process, a large amount of nitrogen oxides will be produced, resulting in the emission of nitrogen oxides exceeding the national standard. At present, asphalt mixing plants have no good countermeasures for nitrogen oxide emissions. Usually, natural gas is used to reduce the concentration of nitrogen oxide emissions as much as possible. However, the use of natural gas requires additional laying of gas pipelines. At the same time, the cost of natural gas is high, and due to the high flame temperature, Nitrogen oxide emissions will still...

AI Technical Summary

Problems solved by technology

[0002] Asphalt mixing plants usually use heavy oil as fuel, and the fuel consumption in their operation is huge

Due to the nitrogen content of the fuel itself, the high flame temperature, and the large excess coefficient of oxygen in the combustion atmosphere during the combustion process, a large amount of nitrogen oxides will be produced, resulting in the emission of nitrogen oxides exceeding the national standard

At present, asphalt mixing plants have no good countermeasures for nitrogen oxide emissions. Usually, natural gas is used to reduce the concentration of nitrogen oxide emissions as much as possible. However, the use of natural gas requires additional laying of gas pipelines. At the same time, the cost of natural gas is high, and due to the high flame temperature, Nitrogen oxide emissions will still exceed the national standard due to reasons such as a large oxygen excess coefficient in the combustion atmosphere

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