Two-tower type pressure reducing coke tar distillation process and apparatus therefor

Abstract

The invention relates to a two-tower type process for distilling vacuum tar and a device thereof. The process comprises the following steps: removing the moisture and light oil distillate of raw tar in a pre-dehydration tower and a dehydration tower at normal pressure; performing decompressing operations in a No.1 distillation tower to obtain carbolic oil, naphthalene oil and light washing oil distillate; and performing decompressing operations in a No.2 distillation tower to obtain heavy washing oil, first anthracene oil, second anthracene oil and mid-temperature pitch. The heat for the pre-dehydration tower and the dehydration tower is supplied by heat conducting oil; the heat for the No.1 distillation tower is supplied by heating the mixed oil on the bottom of the tower circularly in aNo.1 tubular heating furnace; and the heat for the No.2 distillation tower is supplied by heating the mixed oil on the bottom of the No.1 distillation tower in a No.2 tubular heating furnace and thenperforming flash distillation on the mixed oil on the bottom of the No.2 tower. The main devices comprise the dehydration tower, the No.1 distillation tower, the No.2 distillation tower, a dehydration tower reboiler, the No.1 tubular heating furnace, the No.2 tubular heating furnace, a heat exchanger for each distillate, a cooler, a steam generator and the like. The process has the advantages of short technological flow, less device investment, and less energy consumption, thus the process is applicable to large scale coal tar processing engineering.

Description

technical field [0001] The invention relates to the technical field of coal tar processing technology in the metallurgical coking industry, and relates to a process and a device for distilling and separating tar to obtain various fractions and medium-temperature pitch, and is especially suitable for new construction projects of large-scale coal tar processing. Background technique [0002] Coal tar contains tens of thousands of substances, more than 500 kinds of substances have been identified, and more than 200 kinds of products can be processed. Since tar processing is composed of rough separation, fine processing, and obtaining high value-added products, rough separation is an indispensable basis for subsequent processing, and the effect of rough separation will directly affect the quality, yield and energy of subsequent deep-processing products. consumption. [0003] At present, the existing coal tar distillation processes at home and abroad can be divided into three ca...

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Problems solved by technology

Process 2 is a foreign patented technology, which has been introduced in China. Due to the complexity of the process and the large number of equipment, coupled with the introduction of patented technology and main equipment, the investment in the project is very large, and the complexity of the process determines the complexity of the operation. , the on-site operation is more difficult

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