Tail gas treatment system and method for asphalt mixture thermal regeneration combined equipment

Abstract

The invention provides a tail gas treatment system and method for asphalt mixture thermal regeneration combined equipment. The system comprises a regeneration drying roller, a primary drying roller, aprimary combustor and a dust remover, wherein the primary combustor is used for supplying heat to the primary drying roller; the input end of the dust remover is communicated with the tail gas exhaust end of the primary drying roller; the system further comprises a first smoke pipe, a second smoke pipe, a first air door, a second air door and a heat exchanger; one end of the first smoke pipe is connected with the tail gas exhaust end of the regeneration drying roller, and the other end is connected with the air inlet end of the primary drying roller; one end of the second smoke pipe is connected with the tail gas exhaust end of the regeneration drying drum, and the other end is connected with the input end of the dust remover; the first air door is arranged on the first smoke pipe and used for controlling the air inflow of the first smoke pipe; the second air door is arranged on the second smoke pipe and used for controlling the air inflow of the second smoke pipe; the heat exchangeris arranged on the second smoke pipe and used for conducting heat exchange cooling on tail gas; and the hot air output end of the heat exchanger is connected with the air inlet end of the primary combustor.

Description

technical field [0001] The invention relates to the field of asphalt tail gas treatment, in particular to a tail gas treatment system and method of an asphalt mixture thermal regeneration combined equipment. Background technique [0002] Asphalt mixture hot recycling combined equipment is a kind of asphalt mixture production equipment that combines original equipment and recycled equipment. After the new aggregate is dried and heated by the original drying drum of the original equipment, it is screened, stored, and measured. , and then mixed with a certain proportion of asphalt and mineral powder in the original mixing tank. After the waste asphalt mixture is dried and heated by the regeneration drying drum of the regeneration equipment, it is put into the original mixing tank according to the specified ratio according to the gradation requirements. The new aggregate, asphalt, and mineral powder are mixed and stirred at the same time, and finally the finished asphalt mixture...

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Problems solved by technology

[0004] Specifically, when the proportion of regeneration additives increases, the amount of waste asphalt mixture to be processed by the regeneration drying drum increases, and the amount of regeneration tail gas discharged also increases accordingly. At this time, due to the single maximum The mixing capacity is fixed, if the addition ratio of recycled waste and old asphalt mixture increases, the amount of raw new aggregate put into the original mixing tank should be reduced accordingly, so the output of the original equipment must be reduced accordingly. The new aggregate entering the original drying drum is correspondingly reduced, because the structural size of the original drying drum is fixed, and after less new aggregate enters the inside of the original drying drum, the material curtain of the new aggregate At this time, the air volume entering the primary drum includes the air volume provided by the primary burner and the regeneration tail gas. The overall air volume is much greater than the air volume required for drying and heating of new aggregates. When the air volume is too large, not only the heat in the regenerated exhaust gas cannot be utilized, but even part of the heat generated by the original burner may be taken away, resulting in a high temperature of the exhaust gas discharged from the bag filter, which greatly causes energy waste

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