伊朗焦化模擬計(jì)算

1、ripp 2008estimation of delayed coking process for hormuz refinery projectprepared by:china petrochemical technology co., ltd.(sinopec tech)beijing, chinafebruary, 2008project number:07st8601dcu-ir0001llproject name:technology license and basic engineering service for delayed coker unit of hormuz ref

2、inery projectreport classification:02-b-06work duration:2008-012008-02research department:sinopec research institute of petroleum processing (ripp)report written by:liu zibin, shen haipingreport reviewed by:wang zijuntext checked by:fan qimingtable of contentspage1 background.12 basis for delayed co

3、king process estimation.23 estimation of yields and properties of coking products.34 conclusions.4list of tablespagetable 1 properties of coker feedstock.5table 2 recommended operating conditions of dcu.6table 3 estimated yields of coker products.6table 4 estimated components of coker wet gas.7table

4、 5 estimated properties of coker naphtha.8table 6 estimated properties of lcgo.9table 7 estimated properties of hcgo.10table 8 estimated properties of green coke.11table 9 estimated properties of recycle oil.12estimation of delayed coking process for hormuz refinery projectabstract: commissioned by

5、nioec, sinopec tech has made an estimation of delayed coking process for hormuz refinery project to process bottom of the barrel. the product yields and properties were estimated on the basis of sinopec tech extensive experience in pilot plant test and commercial practice.key words: delayed coking e

6、stimation hormuz refinery1 backgroundnational iranian oil refining and distribution company (niordc) and modabber (an iranian investment & development company) are planning to install a 300,000 bpsd grass-roots refinery located in bandar abbas, iran (hormuz refinery project). a new 90,000 bpsd delay

7、ed coker unit (dcu) is chosen to process bottom of the barrel for increasing refinerys overall high value liquid product. china petrochemical technology company (sinopec tech) was awarded by national iranian oil engineering & construction company (nioec), the representative of niordc/modabber, to pr

8、ovide technology license and basic engineering service for dcu of the hormuz refinery project.a blending crude oil of iranian heavy, forouzan, soroush and nowruz crude will be processed in the hormuz refinery, which is a heavy crude with high sulfur and high metal content. the delayed coking process

9、 is particularly suitable for processing the residue with high sulfur, high metal and high asphaltene content, which is difficult to be processed by other residue upgrading process. the refractory residue can be converted by delayed coking process into gas, high value light liquid product and coke w

10、ith low capital and operation cost. dcu of the hormuz refinery project mainly includes coking and fractionation section, blowdown section, hydraulic decoking section, absorption and stabilization section, dry gas and lpg scrubbing section, lpg mercaptan removal section and c3/c4 splitting section.th

11、e simulated data of delayed coking based on the feedstock properties confirmed by nioec at the kick-off meeting will be used as the design basis data for dcu of the hormuz refinery project. the simulated estimation of delayed coking is an accurate prediction of the yields and properties of coker pro

12、ducts for a given feedstock by sinopec tech on the basis of sinopec tech extensive experience in pilot plant test and commercial practice.2 basis for delayed coking process estimationfeedstock properties of dcu confirmed by nioec at the kick-off meeting are shown in table 1. the feedstock of dcu com

13、prises of vacuum residue and slurry from fluid catalytic cracking unit (fccu). the feedstock is a refractory residue with high sulfur, high metal and high asphaltene content. the specific gravity is 1.076, the sulfur content is 5.0 wt%, the heavy metal (ni+v) content is 392 ppmwt and the asphaltene

14、content is 23 wt%.the high metal and asphaltene content of the feedstock indicates its poor thermal stability which can induce fast coking in furnace tubes and produce shot coke in coke drum. the strong coking trend of the feedstock in furnace tubes can increase the frequency of on-line spalling and

15、 shorten furnace operating cycle. the occurrence of shot coke can affect safety of decoking operation.the high sulfur content of feedstock can bring high sulfur content of coking product. the sulfur corrosion to equipment may cause serious safety problems, so the material upgrading of mechanical des

16、ign and other protection measures should be taken to mitigate the hazard of sulfur corrosion.according to minutes of the kick-off meeting, the dcu products of hormuz refinery project includes dry gas, c3, c4, naphtha, light coker gas oil (lcgo), heavy coker gas oil (hcgo) and coke. the cut-point tem

17、perature between naphtha and lcgo is 170c and the cut-point temperature between lcgo and hcgo is 350c.according to the objective of increasing distillate yield and decreasing coke yield of dcu of hormuz refinery project, design considerations with low pressure and low recycle ratio should be selecte

18、d to minimize low value coke yield. the operating conditions of dcu recommended by sinopec tech are listed in table 2.3 estimation of yields and properties of coking productsestimated coker product yields are shown in table 3. the high conradson carbon residue of feedstock causes the high coke yield

19、. the total coker liquid product (c5+) yield is only 52.0 wt% based on the recommended operating conditions of dcu.estimated coker product properties are shown in table 48. estimated coker recycle oil properties are shown in table 9. coker dry gas after h2s removal can be used as refinery fuel gas.

20、c3 after h2s and mercaptan removal can be used as feedstock of producing propylene. c4 after h2s and mercaptan removal can be used as component of lpg. coker liquid products with high sulfur content should be further upgraded by hydrogenation process. hydrotreated naphtha can be used as blending fee

21、dstock of the continuous catalytic reforming unit (ccr) to produce high octane number gasoline component. because the calculated cetane index of lcgo is less than the diesel specification, hydrotreated lcgo needs further upgrading to increase cetane number. hydrotreated hcgo can be used as the feeds

22、tock of fccu. the coke will contain high sulfurand just can be used as solid fuel for steam generation.4 conclusions(1) the feedstock of dcu of the hormuz refinery project is a refractory residue with high sulfur, high metal and high asphaltenes content. the poor thermal stability of feedstock short

23、ens the interval of on-line spalling. the material upgrading of mechanical design and other protection measures should be taken to mitigate the hazard of sulfur corrosion.(2) the high conradson carbon residue of feedstock causes the high coke yield. the total coker liquid product yield is only 52.0

24、wt% based on the recommended operating conditions of dcu.(3) dry gas and c3/c4 need sulfur removal treatment. coker liquid products with high sulfur content should be further upgraded by hydrogenation process. high sulfur coke can be used as solid fuel.table 1 properties of coker feedstockitemunitfe

25、edstockcomponentvacuum residuefccu slurrymass flowkg/h64796162730520656volume flowm3/h60258319mass fractionwt%/973volume fractionv%/973specific gravity/1.0761.0751.093molecular weightg/mol891944326conradson carbon residuewt%26.427.30.1asphaltenes contentwt%23240.0kinematic viscosity70c103mm2/s731414

26、537/200cmm2/s178241273element componentswt%5.05.1270.01nppmwt644266540.2metal contentnippmwt83860.0v3093200.0distillation (astm d1160)1%c4214552735%50554635910%56957939720%62264142630%65666143650%70871345370%78378748080%82282549490%85986051495%87787752899%889889574table 2 recommended operating condi

27、tions of dcuitemunitvaluefurnace outlet temperaturec500coker drum overhead pressurempa (g)0.15recycle ratio (recycle oil / fresh feed)/0.2steam injected in furnace tube (steam / fresh feed)wt%1.0cycle time (coking and decoking time)h36table 3 estimated yields of coker productsproductyield / wt%feed1

28、00.0h2s1.1dry gas4.5c3 (mixed c3/propylene)2.2c4 (mixed c4/butylene)1.7naphtha (c5170c)12.5lcgo (170350c)26.2hcgo (350c)13.3coke38.5table 4 estimated components of coker wet gascomponentcontent / wt%test methodh20.7ripp 78-90ch426.8c2h618.2c2h41.8c3h816.0c3h67.1c4h1011.5c4h86.2c4h60.1h2s11.6total100

29、.0note: ripp test methods are the test methods of ripp.table 5 estimated properties of coker naphthaitemunitvaluetest methoddensity (20c)g/cm30.735astm d4052existent gumg/100ml30gb/t 509induction periodmin80astm d525copper corrosion (50c, 3h)grade3aastm d130rvpkpa85astm d323ron/62astm d2699mon/60ast

30、m d2700bromine numbergbr/100ml80astm d1492benzenev%0.25astm d3606hydrocarbon componentparaffinswt%46.5astm d6623olefins33.0naphthenes9.5aromatics11.0element componentcwt%85.3astm d5291hwt%13.8astm d5291swt%0.75astm d4294nppmwt150astm d4629distillationibpc40astm d865%5310%6230%8750%11070%13390%15595%

31、162ebp170note: gb/t test methods are the national standard test methods of china.table 6 estimated properties of lcgoitemunitvaluetest methoddensity (20c)g/cm30.851astm d4052existent gumg/100ml300gb/t 509flash point (closed cup)c85astm d93cloud pointc-12astm d2500aniline pointc51astm d611copper corr

32、osion (50c, 3h)grade1aastm d13010% conradson carbon residuewt%0.2astm d4530calculated cetane index/42.6astm d4737bromine numbergbr/100ml40astm d1492kinematic viscosity20cmm2/s3.85astm d44550c2.10hydrocarbon componentparaffinswt%34.5astm d2425naphthenes28.2aromatics36.5resins0.8element componentcwt%8

33、4.9astm d5291hwt%12.5astm d5291swt%2.4astm d4294nppmwt900astm d4629distillationibpc170astm d865%18610%19630%22850%26070%29290%32595%335ebp350table 7 estimated properties of hcgoitemunitvaluetest methoddensity (20c)g/cm30.945gb/t 2540flash point (open cup)c215astm d92solidification pointc22gb/t 510conradson carbon residuewt%1.2astm d4530kinematic viscosity80cmm2/s10.4astm d445100c6.75hydrocarbon components