SU199312A1 - METHOD OF OBTAINING OIL COKE - Google Patents

Description

A known method for producing petroleum coke in delayed coking units consists in heating the feedstock in a tube furnace followed by coking in the reactor.

According to the proposed method, coking in the reactor is carried out in the presence of a vaporized heat carrier with a coke number of not more than 3%, heated to a temperature not lower than 500 ° C. The introduction of a heat carrier contributes to the refining of the process of coking over the entire volume of the reactor, which makes it possible to increase the mechanical strength of coke, increase its output and lengthen the operating cycle of the installation.

Example 1. A heavy oil residue (tar + asphalt) with a inlet temperature of 482 ° C with a recycle rate of 1.5 for 26 hours is added to the coke line. 40% of coke with strength above 140 kg / cm and 25% with strength less than 60 kg / cm are obtained. The average coke strength in the reactor is 104 kg / cm, the yield of volatiles is 7.3%.

Example 2. The same raw materials are coked under the same conditions, but after the termination of feeding the reactor with raw materials, a vapor heat carrier (coking gas oil) heated to 505-510 ° C is fed into the reactor for 5 hours. You get 88% coke with a strength above 1400 kg / cm and 12% with strength

more than 60 kg / cm. The average coke strength in the reactor is 155 kg / cm, the volatile yield is 6%.

As a result of the experiment performed, petroleum coke with an average mechanical strength of 1.5 times higher and with a yield of volatiles 1.2 times lower than that of coke obtained by the conventional technology was obtained on the same raw materials.

The drawing shows the practical scheme for producing petroleum coke.

From the bottom of the column / secondary raw materials, obogiHi, eiiHoe by heavy fractions, is taken up by a hot pump 2 and fed to the coil 3, where it is heated to 480-485 ° C. The heated secondary feedstock of transfer line 4 enters the reactor 5. From the accumulator of the column or tank, the pump 6 collects the product serving as a vapor-like heat carrier and is fed to the coil 7, where it is heated to a temperature not lower than 500 ° C and fed through transfer line 8 to the reactor on the opposite side of the supply of secondary raw materials, in order to better contact and the most complete heat and mass transfer. The vaporous coolant is supplied, for example, 6 hours after stopping the supply of raw materials. The coke cooling mode in the reactor remains the same. After the reactor has been disconnected from the feed with raw material of coking, napi is served for 5 of us) i

505-510 ° C as a vaporous coolant.

Subject invention

Method of producing petroleum coke on delayed coking units by heating

the raw material B of the tubular furnace with subsequent coking in the reactor, characterized in that, in order to improve the quality of coke and lengthen the operating cycle of the installation, coking is carried out in the presence of a vapor-like heat carrier with a coke number of not more than 3% heated to temperature not lower than 500 ° C.