Method of retarding of petroleum residue coking

FIELD: petroleum refining industry; petroleum residue coking retarding method.

SUBSTANCE: the invention is pertaining to the field of petroleum refining industry and is aimed at improvement of operation of installation of petroleum residue coking retarding. The method includes a preliminary heating of the original crude, its mixture with a recirculator - a heavy gas-oil of a coking with production of a secondary raw material and heating it up to the temperature of coking in the reactor with formation of a coke and distillate products of coking and preparation of the reactor. In case of failure of one of the reactors the thermal formation of the secondary raw material is cooled and is directed for separation into the rectifying tower, while in the operating reactor they conduct preparation and the following cycle of a coking is exercised in the same reactor. The invention allows by recovery of the process of coking to raise its efficiency.

EFFECT: the invention allows upgrade the coking process efficiency.

2 cl, 1 dwg, 1 tbl

 

The invention relates to methods for delayed coking of petroleum residues and can be used in the oil industry.

The known method for delayed coking in block diagram coking feedstock, in which the unit consists of three reactors, where the raw material is pre-heated, mixed with recirculation and after the secondary heating coil in the furnace is directed to coking in one of the reactors. While the reactor is filled with coke, in the adjacent reactor conduct operations on its preparation for the next cycle coking: the reactor are steamed, cooled, open the hatches and unload the coke, then the hatches closed, the reactor is pressed and heated (Bender DE, pohodenko NT, Bronx B. I. Process for delayed coking in unheated cells", Moscow, Chemistry, 1976, p.32-33).

The disadvantage of this method is the sharp decrease in the efficiency of the process for delayed coking when you try to go on optimal 48-hour cycle of operation of the reactor, when the duration of the stage of coking 24 hours should be equal time to prepare the reactor for 24 hours. In this case, to work effectively, you need an even number of reactors, and even remain unclaimed.

Known methods for delayed coking in block diagram (two reactors and one oven) and duhb is full-time (four reactors with two ovens), where the sequence of operations and the mode is similar to the above described method [ibid, p.21 35]. This is the more promising processes delayed coking unit, having an even number of reactors and operating on a continuous scheme. However, in the case of an interruption of one of the reactors (e.g., for repair) process block diagram with two reactors in General is interrupted, and double drastically reduces its effectiveness.

Closest to the proposed method to the technical nature and number of similar features is way delayed coking unit, comprising preheating the feedstock, feed it to mix with the diluent in a separate mixing tank, a secondary heating of the mixture to a temperature of coking and feeds it into the reactor coking. Moreover, this method can be carried out on two-, three - or chetyrekhsektornoi scheme using as diluent distillate product, which provides the required quality of secondary raw materials [RF patent №2206595, published. 20.06.2003,, IPC 10 In 55/00].

In the known method as in the above, when the failure of one of the reactors process for delayed coking or is interrupted (block diagram with two reactors), or reduces its effectiveness (for schemes with three or four reactors). The major breadboard is Yu bears furnace, the reaction coil, which must be provided with a minimum load of 20 t/h throughout the coking cycle, otherwise occurs coking coil furnace, burnout furnace tubes, which reduces the turnaround mileage furnace and, consequently, the reliability of the process. Ultimately all this leads to increased capital and operating costs and reduce the efficiency of the process.

Thus, the problem of increasing the reliability of the process in case of failure of one of the reactors and the forced transfer process for a longer coking cycle.

The technical result - the recovery process of a delayed coking unit with a simultaneous increase in output of products of coking.

This technical result is achieved in that in the method a delayed coking unit, including pre-heating of raw materials, mixing it with recirculator - heavy oil coking in a separate mixing tank to obtain secondary raw material and heating the latter to a temperature coking, coking in the reactor with the formation of coke and distillate products of coking, followed by their separation in a distillation column for gas, gasoline, light, heavy and CBM gasoil and preparation of the reactor for the next coking cycle, according to the of the invention after filling the reactor Cox secondary raw material after heating in the furnace is cooled and sent to a distillation column for separation, and the next coking cycle carried out in the same reactor.

Suitable secondary raw material after heating in the furnace to cool recirculated - heavy oil coking to a temperature of 380-420°C.

Feeding heat-treated recycled materials in the distillation column after filling the reactor Cox allows you to provide the necessary loading of the reaction coil furnace repair furnace and improve turnaround mileage oven.

In addition, this trick allows you to restore the operating cycle of coking in the case of the implementation of its single scheme and to increase the output of products of coking - double. In General, this trick ensures the operability of the process of coking in the case of an interruption of one of the reactors.

Comparison of the invention with the prototype revealed the presence of a new action: when you stop one of the reactors - flow heat-treated recycled materials in distillation column separation at that time, working as the reactor goes through the stage of preparation for the next cycle of coking in the same reactor, therefore, we can conclude that the criterion of "novelty."

Search for distinctive features not found in similar solutions, therefore, the invention meets the criterion of "inventive step".

On h is rage shows the proposed method, where the dashed line shows the new action.

The method is as follows.

Feedstock 1, in particular the tar is heated in the furnace 2 to a temperature 335-385°and served in a separate mixing tank 3, there also comes in the amount of 10-50% on raw materials - recirculate 4 - gasoil fraction of coking.

From the tank the mixture (secondary raw materials) 5 served in the coils of the furnace 2 for heating to a temperature of coking 480-510°and through the change-over valve, it enters the bottom of the reactor coking unit 6. To increase the flow rate and reduce coking of the tubes in the flow load of the furnace serves turbulator 7 - water condensate. Distillate products coking 8 from the top of the reactor is directed to a distillation column 9, where it is separated into gas 10, gasoline 11, water condensate 12, light 13, heavy 14, 15 CBM gasoil, after which the products output from the installation.

After filling the reactor Cox 16 ~ 24 hours hot stream from the furnace in the absence of trained parallel reactor switch in a distillation column, pre-reducing the flow temperature at the inlet to the column using cold 17 jets (180-200° (C) to a predetermined temperature (380-420°). Instrumentation automatically increase flow for dopolnitelnoj the heat removal 18 columns. Increased consumption of these flows produce the amount of output of coke (15-30%) adjusted share (25-50%) switched commodity flow 19 in the total supply of raw materials for the installation 1.

Filled with coke reactor prepare for the next cycle of coking, without altering the normal sequence of operations, i.e. are steamed, cooled and after removal of covers released by hydroregime from the coke 16, next, close the hatches, pressed, heated hot in a parallel flow from the oven and switch the flow from the furnace into the prepared reactor in full within 48 hours from the beginning of the process. Then all the operations are repeated.

The obtained products coking used for its usual purpose: gas as fuel; gasoline, light and heavy gas oils as raw material for the production of motor fuels; CBM gasoil - as a component of boiler fuel. Output VAT gasoil regulate the temperature loading of the column and the pressure in the column.

The proposed method is illustrated by the following examples, which are given in the table. The data were obtained experimentally when the reactor pressure of 0.4 MPa and a temperature of 498°at the outlet of the furnace.

In the delayed coking process used tar with the following quality indicators: density of 970 kg/m3, cocking behavior 12%retained the e sulfur 1,3%, the output of coke 21%.

As can be seen from the table that in all the examples the proposed method is observed in the recovery process of a delayed coking unit (example 3 in comparison with example 2; example 6 against example 5) with increasing performance on raw twice, increasing the output of products of coking: distillates (raw materials for production of motor fuels) - 40-80% abs., coke 5-10% abs.

In example 8 (the proposed method) modernized standard schemes (DCU 21-10/300) of the delayed coking process (example 7), which allows you to go on a 48-hour cycle of coking and increase the feed capacity of two times, to increase the yield of coke by 50% and distillate 40%.

Thus, the proposed method through the recovery process for delayed coking in case of failure of one of the reactors allows to:

to restore normal operation of the furnace, to increase the turnaround mileage furnace and reliability of the equipment;

- to increase the output of coking products;

- reduce capital and operating costs and improve the efficiency of the process.

1. Way delayed coking of petroleum residues, including preheating of the raw materials, mixing it with recirculator - heavy gas oil is oxolane in a separate mixing tank to obtain secondary raw material and heating the latter to a temperature coking, coking in the reactor with the formation of coke and distillate products of coking, followed by their separation in a distillation column for gas, gasoline, light, heavy and CBM gasoil and preparation of the reactor for the next coking cycle, characterized in that after filling the reactor Cox secondary raw material after heating in the furnace is cooled and sent to a distillation column for separation, and the next coking cycle carried out in the same reactor.

2. The method according to p. 1, characterized in that the secondary raw material after heating in the furnace is cooled by recirculation - heavy oil coking to a temperature of 380-420°C.



 

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3 cl, 1 dwg

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2 cl, 1 dwg, 1 tbl

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2 cl, 2 tbl

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3 cl, 2 ex

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8 cl, 1 ex, 1 tbl, 1 dwg

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