Hot aggregate temperature control device for asphalt mixture stirring station and control method thereof

Abstract

The invention discloses a hot aggregate temperature control device for an asphalt mixture stirring station and a control method thereof, and belongs to the field of advanced control of production processes. The control device is composed of a combustion chamber temperature sub-control loop, a large lag compensation control branch, a flow compensation control branch, a cold aggregate conveying branch and a hot aggregate temperature main control loop; the control method comprises the following steps of establishing a mathematical model of each element in the control device, the mathematical model comprises a transfer function of the master controller, a transfer function of the master controller, a transfer function of the large lag compensation controller and a transfer function of the flow compensation controller. According to the control device and control method, the influence of the flow change of the cold aggregate on the temperature of the hot aggregate is compensated by using the flow compensation branch, the influence of the large lag characteristic of the drying drum on the temperature of the hot aggregate is overcome by the large lag compensation control branch, the combustion chamber temperature sub-control loop of the combustion chamber accelerates the heating response speed of the combustor and reduces the influence on the temperature of the hot aggregate, and the hot aggregate temperature main control loop further improves the temperature control and preparation precision of the hot aggregate.

Description

technical field [0001] The invention belongs to the field of advanced control of the production process, in particular to a thermal aggregate temperature control device and method of an asphalt mixing plant. Background technique [0002] The temperature control of the hot aggregate in the asphalt mixing plant is one of the key factors to produce high-quality asphalt mixture. The whole asphalt mixing process has very high requirements on the temperature of the hot aggregate. During the mixing process of asphalt mixture, the temperature of the hot aggregate affects the quality of the asphalt mixture: if the temperature of the hot aggregate is too low, the temperature of the final asphalt mixture will also decrease, which will affect the quality of paving and rolling, resulting in uneven mixing and rolling Difficult situation: if the temperature of the hot aggregate is too high, the asphalt mixture will be overheated and aged, the cohesive force will be reduced, and the segrega...

AI Technical Summary

Problems solved by technology

Considering the hot aggregate temperature control of the asphalt mixing plant, it is necessary to solve the influence of the large hysteresis characteristics of the drying drum on the temperature stability of the hot aggregate, the influence of the amount of cold aggregate input on the temperature stability of the hot aggregate, and the slow heating response speed of the burner For these three problems, a new control method is designed so that the temperature of the hot aggregate in the asphalt mixing plant is controlled within the range of 180°C ± 3°C

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