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Improved method of delay coking process

A technology for delayed coking and process improvement, applied in the field of delayed coking process improvement, can solve the problems of dangerous production, increased energy consumption of process systems, and difficulty in achieving smooth operation of large-scale coking units.

Inactive Publication Date: 2012-06-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent the clogging of heating furnace tubes in industry, water steam injection or large circulation ratio measures are often adopted to reduce the residence time of residual oil raw materials in heating furnace tubes and prevent coke deposition and agglomeration, but these measures cause energy consumption of the process system increase, and even induce the production of projectile coke, bringing production hazards
Patent CN1286947C divides a coking cycle into three stages. From one stage to the next stage, it is necessary to adjust the temperature of the heating furnace and switch different raw material oil products. Such frequent adjustments are difficult to achieve smooth operation for large coking units.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Example: First, transfer 20wt% of the narrow fraction of coking light wax oil into the coking residue raw material (see Table 1 for properties), mix evenly, take 500g of the mixture and place it in an autoclave, and measure the residue under heating at 400°C The coke induction period of the raw materials was 108 min (see Table 2). Then use a metering pump to drive the mixture into the heating furnace tube of the coking unit (the weight during drying has been weighed in advance) and heat to increase the temperature. The outlet temperature rises to 503°C and enters the coke tower for thorough coking reaction, solid coke coalescing In the coke tower, oil and gas products overflow through the large oil and gas pipeline of the coke tower and enter the fractionation tower for separation. After 24 hours of continuous oil feeding through the heating furnace tube, the feeding was stopped and the toluene solvent was improved. At the same time, the temperature in the heating furnac...

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Abstract

The invention provides a method for improving the delayed coking technique. The method is as follows: coked raw material residual oil is heated by a heating furnace and enters into a coking tower; coke generated is accumulated in the coking tower; and gas, naphtha, light diesel oil, heavy diesel oil, light wax oil and heavy wax oil are obtained after separation of oil gas fluid products through acoking and fractionating tower. The light diesel oil, the heavy diesel oil, the light wax oil or the heavy wax oil are used as circulation materials through adjustment of the sources, the distillation range and the circulation of the circulation materials, and then the coking induction period of mixture can be prolonged and the coking dynamics of the coked raw material residual oil can be changed; and the coking reaction of the residual oil is delayed to be performed in the coking tower more completely, thereby achieving the aim of prolonging the operating period of a heating furnace tube. The operating period of the coking and heating furnace can be prolonged to be between 3 and 18 months generally according to the extended degree of the coking induction period determined by the sources,the distillation range and the circulation of the circulation materials selected.

Description

Technical field [0001] The invention belongs to the technical field of chemical engineering and is a method for improving the delayed coking process. Specifically, it circulates a distillate oil derived from petroleum and coal tar to prolong the coking induction period of the coking raw material residual oil and make the coking reaction It is fully delayed to the coke tower to effectively prevent coking in the heating furnace tube, thereby prolonging the start-up period of the coking heating furnace tube. Background technique [0002] Delayed coking is a decarburization process that can process a wide range of residual oil raw materials to obtain high value-added light oil products. Because the coking process does not use catalysts, there are no restrictions on the value of raw material residual carbon, metal content, etc.; the investment and operating costs of the delayed coking process are low, and it has generally become residual oil (especially low-quality slag with high resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/16
Inventor 郭爱军王宗贤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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