CN1465658A - Method for simutaneously raising treatment quantity and diesel recovery ratio of delay coking apparatus - Google Patents
Method for simutaneously raising treatment quantity and diesel recovery ratio of delay coking apparatus Download PDFInfo
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- CN1465658A CN1465658A CNA021215936A CN02121593A CN1465658A CN 1465658 A CN1465658 A CN 1465658A CN A021215936 A CNA021215936 A CN A021215936A CN 02121593 A CN02121593 A CN 02121593A CN 1465658 A CN1465658 A CN 1465658A
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- coker
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Abstract
The method for simultaneously raising treatment capacity of delayed coking equipment and diesed oil yield, includes the following steps: heating the coking raw material to 480 deg.C-510 deg.C by means of first heating furnace, then heating coker gas oil and arbitrarily-selected straight-run gas oil and deasphalted oil to 510 deg.C-580 deg.C by means of second heating furnace; feeding the materials obtained by above-mentioned two heating furnaces into coke drum for coking, remaining the coke in coke drum and separating coking oil gas to obtain coker gas, coker dgasoline, coker diesel oil and coker gas oil, in which feeding coker gas oil into second heating furnace, can raise equipment treatment capacity by up to 50%.
Description
Technical field
The invention belongs to a kind of under the situation that does not have hydrogen the thermal non-catalytic cracking method of hydrocarbon ils, more particularly, be a kind of method that improves delayed coking unit treatment capacity and diesel yield simultaneously.
Background technology
Existing delayed coking major equipment is process furnace, coke drum, separation column and mechanical facilities such as corresponding decoking, accumulating, its main basic procedure is as follows: stock oil is after interchanger and the preheating of process furnace convection zone, be introduced at the bottom of the separation column, with coking oil gas heat exchange in separation column from the coke cat head, on the one hand the lightweight oil fractionation in the raw material is come out, heated raw material simultaneously again.Pump into the process furnace radiation section after stock oil at the bottom of the separation column and heavy distillate mixing, be heated to the required temperature of pyrogenic reaction, enter coke drum and carry out coking, the coke of generation is accumulated in the coke drum, switches to another coke drum after general 24 hours and continues coking.The coking oil gas that generates from the coke cat head overflow enter separation column bottom and stock oil heat exchange after, obtain gas, gasoline, diesel oil and gas oil caterpillar through fractionation, the heavy distillate that is difficult for gasification with circulate after stock oil mixes.
Because domestic diesel oil market is jagged, gasoline is superfluous relatively at present, and each refinery all wishes to utilize existing apparatus, improves macroscopical diesel and gasoline ratio; Along with heaviness and refinery's enlarging of crude oil, also need the refinery to improve the processing power of supporting residual oil device simultaneously.Based on this, each major company both domestic and external and research unit have adopted different technology respectively for improving delayed coking diesel yield and device processing power.
USP 4,455,219th, by reducing recycle ratio, reduce the quantity of circulation heavy recycle stock, add the component of the low boiling range of part simultaneously in raw material, reach and improve the purpose that total liquid is received, reduced coking yield.USP 4,518,487th, substitute heavy recycle stock fully by the component that will hang down boiling range, reach and improve the purpose that total liquid is received, reduced coking yield.But these two patents mainly are to reach by the yield that improves coker gas oil to improve the purpose that total liquid is received, reduced coking yield.When improving treatment capacity, the yield of gasoline and diesel oil distillate has reduced.
CN 85,103,235A extracts 168～454 ℃, 232～399 ℃ and 260～343 ℃ of diesel oil distillates out to enter the radiation section of coking heater as turning oil from coking fractional distillation column, to reduce recycle ratio, reach the purpose of volume increase liquid product, this method mainly be with gasoline or diesel oil distillate at the coker internal recycle, little to increasing the diesel yield benefit.
Above-mentioned prior art is to the improvement of delayed coking, mainly is the raising that utilizes the partial circulating expansion of implement device recently can and utilize distillate to circulate to realize diesel yield.But, in the realization of technology, be subjected to the restriction of process furnace thermal load bottleneck on the one hand for old plant modification; Because turning oil reduces, and under coking temperature (about 500 ℃), heating furnace tube is easy to coking, so recycle ratio generally is controlled at about 0.2～0.25, the device processing power is maximum to improve 15～25% on the other hand.The boiling range and the quantity of turning oil is then depended in the raising of diesel yield.Here also have a problem, i.e. systemic circulation ratio and device expand and can not realize simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of method that improves delayed coking unit treatment capacity and diesel yield simultaneously.
Method provided by the invention may further comprise the steps:
(1) coking raw material is heated to 480 ℃～510 ℃ through first process furnace;
(2), coker gas oil and optional straight run gas oil, deasphalted oil are heated to 510 ℃～580 ℃ through second process furnace;
(3), step (1) and step (2) gained material are advanced the coke drum coking together, coke is stayed in the coke drum, separates coking oil gas and obtains cooking gas, coker gasoline, coker gas oil and coker gas oil, and wherein coker gas oil returns step (2).
The conventional relatively delayed coking of the present invention, the coker gas oil yield increases by 6～10 percentage points, and the unit capacity raising reaches 50%.
Description of drawings
Accompanying drawing is the method synoptic diagram that improves delayed coking unit treatment capacity and diesel yield simultaneously provided by the invention.
Embodiment
Method provided by the invention may further comprise the steps:
(1) coking raw material is heated to 480 ℃～510 ℃ through this process furnace radiation section again through the first process furnace convection zone preheating, and coking raw material also can be heated to 480 ℃～510 ℃ through this process furnace radiation section through separation column earlier, water injection rate 1～10% (accounting for charging) again;
(2), coker gas oil and optional straight run gas oil, deasphalted oil are heated to 510 ℃～580 ℃ through second process furnace, water injection rate 0～10% (accounting for charging);
(3), with step (2) and step (1) gained material by weight 0.1～2.0 into coke drum coking that is mixed, coke tower top pressure 0.1～1.0MPa (absolute pressure), coke is stayed in the coke drum, separate coking oil gas and obtain cooking gas, coker gasoline, coker gas oil and coker gas oil, wherein coker gas oil returns step (2).
The described coking raw material of step (1) is that tar, the lubricating oil of long residuum, vacuum residuum, visbreaking residue, catalytically cracked oil, hydrocracking tail oil, preparing ethylene by steam cracking is extracted oil or its mixture out.
In the step (2) charging of second process furnace for this coker produce＞350 ℃ coker gas oil, also other coker produce＞350 ℃ coker gas oil, also mixture, coker gas oil and the straight run gas oil of mixture, coker gas oil and the deasphalted oil of coker gas oil and straight run gas oil, the mixture of deasphalted oil.
For the delayed coking unit that has built up, the load of process furnace is certain, and it is certain promptly requiring process furnace radiating furnace tube inlet amount, if improve the ratio that recycle ratio promptly improves turning oil, meaning must corresponding reduction fresh feed amount.The present invention heats the round-robin coker gas oil in second process furnace, therefore do not increase by the first process furnace radiating furnace tube flow, reduce by the first process furnace radiating furnace tube inlet amount on the contrary, thereby can increase substantially the fresh feed amount, promptly improved the treatment capacity of device.
Below in conjunction with accompanying drawing method provided by the present invention is further detailed, but does not therefore limit the present invention.
Accompanying drawing is the method synoptic diagram that improves delayed coking unit treatment capacity and diesel yield simultaneously provided by the invention.
As vacuum residuum after pipeline 1 enters separation column 2, successively through pipeline 3, pump 4, after pipeline 5 enters first process furnace 6 and is heated to 480 ℃～510 ℃, successively through pipeline 7,8 enter coke drum 9 carries out pyrogenic reaction, the coke that reaction generates is stayed in the coke drum, coking oil gas enters separation column 2 through pipeline 10, separate and obtain cooking gas, coker gasoline, coker gas oil and coker gas oil are respectively through pipeline 11,12,13,14 draw, wherein the part coker gas oil is successively through pipeline 15, pump 16, after pipeline 17 enters second process furnace 18 and is heated to 510 ℃～580 ℃, after the coking raw material from pipeline 7 mixes, enter coke drum 9 through pipeline 19 and carry out pyrogenic reaction.
Method advantage provided by the invention is:
1, because coker gas oil reacts, helps improving diesel yield under higher temperature.Conventional relatively delayed coking, the coker gas oil yield increases by 6～10 percentage points.And the coker gas oil quality is better than catalytic cracking diesel oil, can reach about 50 as cetane value.
2, eliminate the bottleneck problem of coker capacity expansion revamping process furnace, helped the significantly expansion energy of device.
3, owing to the stock oil Heating temperature that is easy to coking is low, help reducing the coking of process furnace, prolong on-stream time.
4, the working method that coker gas oil is general is for mixing in the straight run gas oil, as the raw material of catalytic cracking.Because catalytic cracking is the device based on gasoline production, and the diesel and gasoline ratio of coker is generally all more than 2, so utilize coking processing coker gas oil to help improving macroscopical diesel and gasoline ratio of refinery.
The following examples will give further instruction to present method, but therefore not limit present method.
Comparative Examples
With vacuum residuum is coking raw material, be to have carried out conventional coking test on the medium-sized coker of 10kg/hr in processing power, be the shared process furnace of round-robin coker gas oil and vacuum residuum, heater outlet temperature is 500 ℃, and other operational condition and material balance are listed in table 1.As can be seen from Table 1, the yield of coker gas oil is 32.85 weight %, and coking yield is 23.06 weight %.
Embodiment
Compare with Comparative Examples, vacuum residuum advances first process furnace and is heated to 500 ℃, and the round-robin coker gas oil advances second process furnace and is heated to 530 ℃, and other operational condition and material balance are listed in table 1.As can be seen from Table 1, the yield of coker gas oil is 41.17 weight %, has increased by 8.32 percentage points than Comparative Examples.The treatment capacity of device increases by 50%.
Table 1
| Comparative Examples | Embodiment | |
| The first furnace outlet temperature, ℃ | ????500 | ????493 |
| The second furnace outlet temperature, ℃ | ????500 | ????530 |
| The coke tower top pressure, MPa | ????0.17 | ????0.17 |
| The coke drum inlet temperature, ℃ | ????495 | ????510 |
| The weight ratio of global cycle charging and raw material | ????0.4∶1 | ????1∶1 |
| Relative treatment capacity, % | ????100 | ????150 |
| Material balance, weight % | ||
| Gas | ????7.17 | ????11.10 |
| Gasoline | ????14.87 | ????19.30 |
| Diesel oil | ????32.85 | ????41.17 |
| Gas oil | ????22.05 | ????3.90 |
| Coke | ????23.06 | ????24.53 |
| Add up to | ????100.00 | ????100.00 |
Claims (5)
1, a kind of method that improves delayed coking unit treatment capacity and diesel yield simultaneously may further comprise the steps:
(1) coking raw material is heated to 480 ℃～510 ℃ through first process furnace;
(2), coker gas oil and optional straight run gas oil, deasphalted oil are heated to 510 ℃～580 ℃ through second process furnace;
(3), step (1) and step (2) gained material are advanced the coke drum coking together, coke is stayed in the coke drum, separates coking oil gas and obtains cooking gas, coker gasoline, coker gas oil and coker gas oil, and wherein coker gas oil returns step (2).
2, according to the method for claim 1, its feature is tar, lubricating oil extraction oil or its mixture of long residuum, vacuum residuum, visbreaking residue, catalytically cracked oil, hydrocracking tail oil, preparing ethylene by steam cracking at the described coking raw material of step (1).
3,, it is characterized in that the described coke tower top pressure of step (3) 0.1～1.0MPa according to the method for claim 1.
4,, it is characterized in that the described first process furnace water injection rate of step (1) is 1～10 weight % of coking raw material according to the method for claim 1.
5,, it is characterized in that the weight ratio of the material that described step (2) and step (1) are heated is 0.1～2.0 according to the method for claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021215936A CN1195821C (en) | 2002-06-27 | 2002-06-27 | Method for simutaneously raising treatment quantity and diesel recovery ratio of delay coking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021215936A CN1195821C (en) | 2002-06-27 | 2002-06-27 | Method for simutaneously raising treatment quantity and diesel recovery ratio of delay coking apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1465658A true CN1465658A (en) | 2004-01-07 |
| CN1195821C CN1195821C (en) | 2005-04-06 |
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| CNB021215936A Expired - Lifetime CN1195821C (en) | 2002-06-27 | 2002-06-27 | Method for simutaneously raising treatment quantity and diesel recovery ratio of delay coking apparatus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386408C (en) * | 2005-07-06 | 2008-05-07 | 华东理工大学 | Delayed coking treatment method for waste biomass |
| CN101203739B (en) * | 2005-06-23 | 2010-12-08 | 英国石油国际有限公司 | Process for evaluating quality of coke and bitumen of refinery feedstocks |
| CN102373080A (en) * | 2010-08-19 | 2012-03-14 | 中国石油化工股份有限公司 | Coking delaying method |
| CN103113906A (en) * | 2013-01-08 | 2013-05-22 | 何巨堂 | Coking delaying method of easy-coking oil product |
| CN106675614A (en) * | 2015-11-09 | 2017-05-17 | 中国石油化工股份有限公司 | Coking method |
| CN115873631A (en) * | 2021-08-27 | 2023-03-31 | 中国石油化工股份有限公司 | Method and apparatus for delayed coking |
-
2002
- 2002-06-27 CN CNB021215936A patent/CN1195821C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101203739B (en) * | 2005-06-23 | 2010-12-08 | 英国石油国际有限公司 | Process for evaluating quality of coke and bitumen of refinery feedstocks |
| CN100386408C (en) * | 2005-07-06 | 2008-05-07 | 华东理工大学 | Delayed coking treatment method for waste biomass |
| CN102373080A (en) * | 2010-08-19 | 2012-03-14 | 中国石油化工股份有限公司 | Coking delaying method |
| CN103113906A (en) * | 2013-01-08 | 2013-05-22 | 何巨堂 | Coking delaying method of easy-coking oil product |
| CN106675614A (en) * | 2015-11-09 | 2017-05-17 | 中国石油化工股份有限公司 | Coking method |
| CN106675614B (en) * | 2015-11-09 | 2018-06-15 | 中国石油化工股份有限公司 | A kind of coking method |
| CN115873631A (en) * | 2021-08-27 | 2023-03-31 | 中国石油化工股份有限公司 | Method and apparatus for delayed coking |
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| Publication number | Publication date |
|---|---|
| CN1195821C (en) | 2005-04-06 |
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