A process for upgrading asphalt by flashing and maintaining pressure combined with electric tracing heating and maintaining temperature in retention tower

Abstract

The invention relates to a flashing and pressure holding combined retention tower electric tracing heating temperature holding modified pitch production technology. The production technology is a single-heat production technology, only one tube furnace is adopted for heating in the process, energy-saving effect is remarkable, and flashing separation and continuous heating temperature holding thermal polymerization are combined. Flashing separation is conducted firstly on pitch, then oxidization thermal polymerization is conducted by controlling electric heating temperature holding accurately, an obtained target product meets the requirement of the carbon industry for pitch better, cohesiveness is excellent during mixed kneading of a carbon element mixture, and coking value is higher after roasting.

Description

technical field [0001] The invention relates to the technical field of modified asphalt production, in particular to a process for modifying asphalt by flashing and maintaining pressure combined with electric tracing heating of a retention tower and maintaining temperature. Background technique [0002] Hard asphalt and modified asphalt are made from medium temperature asphalt after corresponding treatment. The production methods of modified asphalt using asphalt as raw material mainly include oxidative thermal polymerization, atmospheric pressure thermal polymerization, pressurized thermal polymerization, vacuum flash evaporation, etc. In the existing process, the raw material tar is centrifugally separated by a super centrifuge to remove coal dust, free carbon and water and then enters the dehydration tar tank. After ℃, it enters the dehydration tower, and the anhydrous tar dehydrated to less than 0.2% enters the convection section of the tube furnace and heats it to abou...

AI Technical Summary

Problems solved by technology

In the existing process, the raw material tar is centrifugally separated by a super centrifuge to remove coal dust, free carbon and water and then enters the dehydration tar tank. After ℃, it enters the dehydration tower, and the anhydrous tar dehydrated to less than 0.2% enters the convection section of the tube furnace and heats it to about 280°C, and then enters the fraction tower. Coking, the bitumen extracted from the bottom of the distillate column is heat-exchanged by an anhydrous tar / bitumen heat exchanger to obtain a medium-temperature bitumen product of general quality, and the bitumen is heated by steam during the transmission and standing process. This method of heating and maintaining temperature is difficult. Meet the requirement of asphalt to maintain a temperature above 300°C

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