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Hydrogenation coke method by adding coking distillate oil in residual oil

A technology of coking distillate oil and residual oil, which is applied in the field of adding coking distillate oil to residual oil for hydrogen coking, which can solve the problems of low quality petroleum coke, short furnace tube coking cycle, and low yield of liquid products, etc.

Inactive Publication Date: 2013-12-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of adding coking distillate oil to the residual oil to circulate hydrogen coking, screen out suitable industrial hydrogen donor fractions for hydrogen coking fractions, and determine the optimal hydrogen supply ratio to improve liquid recovery. And reduce the amount of coke, so as to improve the common problems of delayed coking, such as short furnace tube coking cycle, low quality petroleum coke (shot coke, sticky coke, powder coke), low yield of liquid products, etc.

Method used

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  • Hydrogenation coke method by adding coking distillate oil in residual oil
  • Hydrogenation coke method by adding coking distillate oil in residual oil
  • Hydrogenation coke method by adding coking distillate oil in residual oil

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Effect test

Embodiment 1

[0013] The properties of a typical hydrogen donor fraction are shown in Table 1.

[0014] Table 1 Structural parameters of hydrogen donor coking wax oil

[0015]

[0016] It can be seen that the naphthenic carbon content of this part of coking distillate oil is higher, so the concentration of active hydrogen atoms that can be transferred to other large aromatic free radicals that are easy to condense and generate coke is higher when heated, so in In the delayed coking process, using this part of the fraction to circulate will inevitably inhibit the coking of the furnace tube and the formation of shot coke, reduce the coke yield, and increase the yield of liquid distillate oil products. The alkyl carbon fraction of the hydrogen-donating wax oil component is low, indicating that the number of free radicals generated by this part of the alkyl carbon is the smallest when heated, so the probability of consuming its own potential hydrogen-donating capacity is the lowest. The rel...

Embodiment 2

[0020] The properties of a typical hydrogen donor fraction are shown in Table 1.

[0021] Table 3 Structural parameters of hydrogen donor coking wax oil

[0022]

[0023] Table 4 Changes in liquid recovery and coke production

[0024]

[0025] It can be seen that the naphthenic carbon content of this part of the coking distillate is low, and the alkyl carbon content of the hydrogen-donating wax oil component is relatively high, so the effect after its addition is not as good as that of the distillate D. The amount of coke produced and the effect of liquid collection are not good.

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Abstract

The invention relates to a hydrogenation coking method by adding coking distillate oil in residual oil. According to the invention, coking distillate oil and the coking raw material residual oil are mixed according to a weight ratio of 0.2:0.4; the mixture is preheated in a heating furnace convection section, and is delivered into a buffering tank; the mixture is heated into a heating furnace radiation section and is heated to a coking temperature; the mixture is coked in a coking tower. A reaction tower inlet temperature is 480-520 DEG C, and a pressure is 0.1-1MPa. The coking distillate oil is selected from coking diesel, coking middle-section distillate, coking light gas oil, coking heavy gas oil, or a mixture thereof. According to the invention, because the coking distillate oil is rich in benzo cycloalkane ring, the coking distillate oil can be adopted as a hydrogen donor. Therefore, furnace pipe coking and production of shot coke can be inhibited, coke yield can be reduced, and liquid distillate oil product yield can be improved.

Description

technical field [0001] The invention relates to a method for adding coking distillate oil to residual oil for hydrocoking. Background technique [0002] As an important means of lightening heavy oil, delayed coking has been widely used by domestic and foreign refineries due to its strong adaptability to raw materials, mature technology, and low investment. Selecting the appropriate circulation ratio and determining the optimal circulation flow not only have a great influence on the distribution of delayed coking products, but also affect the coking tendency of the flow in the heating furnace, which causes many problems: such as the occurrence of shot coke, overloading of the distillation tower , The distillation effect is not good, and sometimes the burning cycle of the heating furnace tube is shortened and so on. [0003] Adding free radical inhibitors, hydrogen donors or additives with good dispersibility to asphaltene free radicals are all effective ways to inhibit coke ...

Claims

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Application Information

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IPC IPC(8): C10G47/34
Inventor 王宗贤蔺爱国邢颖春秦本记郭爱军谢崇亮付兴国杨普江陈坤王齐吴丽萍郭凯黎张蕾蕾高永
Owner PETROCHINA CO LTD
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