EP1036837B1 - Unite permettant d'introduire une solution d'inhibiteur de depots de coke dans des fours a tube servant a la pyrolyse d'hydrocarbures bruts - Google Patents

Unite permettant d'introduire une solution d'inhibiteur de depots de coke dans des fours a tube servant a la pyrolyse d'hydrocarbures bruts Download PDF

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Publication number
EP1036837B1
EP1036837B1 EP98929942A EP98929942A EP1036837B1 EP 1036837 B1 EP1036837 B1 EP 1036837B1 EP 98929942 A EP98929942 A EP 98929942A EP 98929942 A EP98929942 A EP 98929942A EP 1036837 B1 EP1036837 B1 EP 1036837B1
Authority
EP
European Patent Office
Prior art keywords
coil
inhibitor
supplying
straight run
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98929942A
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German (de)
English (en)
Other versions
EP1036837A1 (fr
EP1036837A4 (fr
Inventor
Vladimir Andreevich Buschuev
Jury Sergeevich Zemtsov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forest Star International Ltd
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Forest Star International Ltd
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Publication date
Application filed by Forest Star International Ltd filed Critical Forest Star International Ltd
Publication of EP1036837A1 publication Critical patent/EP1036837A1/fr
Publication of EP1036837A4 publication Critical patent/EP1036837A4/fr
Application granted granted Critical
Publication of EP1036837B1 publication Critical patent/EP1036837B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
    • C10G9/16—Preventing or removing incrustation

Definitions

  • the present invention relates to the petrochemical industry and is intended for use in plants for ethylene and propylene production by thermal cracking (pyrolysis) of hydrocarbon feedstock.
  • ethylene and propylene is based on the pyrolysis of hydrocarbon feedstocks in the presence of steam in furnaces with tubular coils.
  • feedstock ethane propane-butane mixes, as well as naphtha and gas oil fractions are used.
  • a pyrolysis furnace has two sections: convection and radiant. Passing through the coil of the convection section feedstock is evaporated, mixed with steam and preheated to 550-650°C. In the subsequent radiant section this mixture is heated up to 750-950°C and cracked, thus forming ethylene, propylene, butylene and several byproducts.
  • the main problem of this process is formation and build-up of coke deposits on the coil walls of the radiant section. In most furnaces these coke deposits are removed by burning-out with steam and oxygen.
  • coke deposition is prevented by introduction of an inhibitor into the process stream which includes, for example, alkaline-metal compounds.
  • an inhibitor in the form of an aqueous solution or suspension of such compounds is injected into the hot feedstock flow via an injection unit inserted close to the boundary between convection and radiant sections of the coil.
  • wall burn outs/perforation happen frequently in the zone of inhibitor solution injection. These burn outs are caused by the impingement of droplets of inhibitor solution on the hot metallic walls close to the point of injection which produce multiple cycle temperature changes causing thermal metal fatigue and resultant furnace break down.
  • European Patent EP 0617112 A2 discloses injection unit for introducing a liquid coke inhibitor solution into tubular reactor for hydrocarbon pyrolysis incorporating a straight run of a coil with inlet pipe for supplying a feedstock, an inhibitor atomizer, a tube for supplying an inhibitor to the atomizer and surrounding it an additional tube positioned coaxially.
  • the latter tube surrounding the atomizer serves as a shroud protecting the coil walls from impingement by liquid inhibitor solution.
  • This additional tube in itself is not protected from droplets of inhibitor solution.
  • European Patent EP 0606898 B1 discloses a unit for introducing coke inhibitor solution into a tubular furnace for hydrocarbon pyrolysis which includes a straight run of a coil with inlet pipe for supplying a feedstock, an injection nozzle for inhibitor atomizing and a tube for supplying an inhibitor to injection nozzle which is positioned in parallel to the flow of gaseous feed stream and can be moved along an axial direction. In the operating position the nozzle is moved into the gaseous stream extending a distance of about 1-3 times the diameter of the coil straight run.
  • US Patent No 5435904 discloses the unit for introducing a coke inhibitor solution into a tubular furnace for hydrocarbon pyrolysis which includes a straight run of a coil with inlet pipe for supplying a feedstock, an inhibitor atomizer, a tube for supplying an inhibitor to atomizer and surrounding it an additional tube positioned coaxially.
  • a compressed gas is used which is supplied to the atomizer through an annular passageway between the inner and additional tubes.
  • US Patent No 4708787 discloses the unit to disperse a liquid throughout a gaseous stream.
  • This unit includes a straight run of pipe equipped with inlet conduit together with an insert in the form of a Venturi tube for supplying a gas, a liquid atomizer and a tube for supplying a liquid to the atomizer which are coaxially positioned within the pipe straight run, and that the atomizer is concentrically located within the throat of the Venturi tube.
  • US Patent N° 3812029 discloses the unit for injection of a liquid with susceptibility to coke formation into a vessel preheated to a high temperature.
  • This unit includes an inner tube for supplying an injected liquid and surrounding it shroud in which water is introduced.
  • the said inner tube and shroud end in a common nozzle where the injected liquid and water are mixed prior to their introduction into the heated vessel.
  • USSR Inventor's Certificate N° 1661189 A1 discloses a unit for purging the inner surface of a cylindrical branch pipe by air stream.
  • This unit includes a tube for supplying compressed air, positioned concentrically with the branch pipe, together with an annular nozzle fixed on the said tube forms the air stream in the shape of a hollow cone.
  • USSR Inventor's Certificate No 633892 discloses a unit for introduction of a coke deposition inhibitor into a tubular furnace for hydrocarbon pyrolysis.
  • This unit includes inner and outer tubes positioned concentrically. Preheated hydrocarbon feedstock flows through the inner tube. A gaseous coke inhibitor is introduced into the feed flow through a passageway between the inner and outer tubes.
  • the invention resolves the problem of elimination of coil burn outs in the zone of inhibitor solution injection.
  • a unit for injecting a coke-deposition inhibitor solution into a tubular furnace for hydrocarbon pyrolysis including a straight run of a coil with inlet pipe for supplying a feedstock, an inhibitor atomizer, a tube for supplying an inhibitor to atomizer and surrounding it an additional tube positioned coaxially, is provided with a vortex gate for reducing a turbulence downstream from point of injection.
  • the vortex gate is formed by radial plates and cylindrical rings and is concentrically located within a straight run of a coil in the zone of inhibitor solution injection.
  • the vortex gate is an aerodynamic grid which divides the flow into individual streams aligned in parallel to the axis of the coil. Within a specific distance related to the diameter of the coil in a straight run downstream from the vortex gate flow turbulence decreases with a corresponding reduction in radial drift rate of additions.
  • the radial drift rate of the inhibitor solution droplets from the flow stream core to the wall layer of the coil decreases and evaporation of the droplets is completed before they reach the wall. This prevents the risk of coil wall burn out.
  • the preferred atomizer is the swirler.
  • the advantage of the swirler is the axially symmetrical form of the atomized liquid cone which minimizes feed stock flow disturbance at the outlet of the vortex gate.
  • This preferred configuration of the invention also has the following features:
  • Fig.1 the general view of the injection unit is shown and in Fig.2 the sectional view of vortex gate is shown.
  • the injection unit comprises the straight run of a coil 1 with the flange 2, the inlet branch pipes 3, 4 and the insert assembly including the back flange 5, the inhibitor supply tube 6, the additional tube 7, the swirler 8 and the vortex gate formed by the radial plates 9 and cylindrical rings 10, 11, 12, 13.
  • the insert assembly is centred within the straight run of the coil 1 by the flange 2 and by projections of the radial plates 9.
  • the cylindrical rings 10, 11, 12, 13 are attached to the radial plates 9 coaxially with the additional tube 7 and form inner passage which expands in stages in the direction of flow.
  • the injection unit operates in the following way.
  • the feedstock flow coming from the convection section of the furnace enters into the straight run of the coil 1 of the furnace radiant section.
  • the aqueous solution of coke-deposition inhibitor is delivered under pressure from an outside source (not shown in drawings) to the swirler 8 through the inhibitor supply tube 6 and is injected into the feedstock flow.
  • the cylindrical rings 10, 11, 12, 13 and the radial plates 9 form together the vortex gate which divides the feedstock flow into individual streams aligned in parallel to axis of the straight run of the coil.
  • the vortex gate includes four cylindrical rings, 10, 11, 12 and 13. Their width increases in ratio to the inner diameter of the coil in the straight run from 0.25 for ring 10 up 0.9 for ring 13.
  • the widths of the rings have been developed from experimental data.
  • the number of the rings has been chosen on the basis that the effectiveness of a vortex gate having less than 3 rings sharply decreases but vortex gate using more than 5 rings under the operating conditions of the injectors is undesirable because of restrictions generated in the flow cross section of the coil.
  • the distance from the upstream edge of plate 9 to the closest point of junction of the feed stock supply line 4, is not less than twice the inner diameter of the coil.
  • the effectiveness of the injection unit at that distance increases due to the additional decrease in flow turbulence intensity at the point of inhibitor injection.
  • the present invention can be applied in tubular furnaces for hydrocarbon pyrolysis where coking is prevented by injecting an inhibitor solution into the hot process stream.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Claims (5)

  1. Unité destinée à injecter une solution d'inhibiteur de dépôt de coke dans des fours tubulaires en vue d'une pyrolyse d'hydrocarbure comprenant un tronçon droit d'un serpentin (1) comportant un tuyau d'entrée (3, 4) destiné à fournir une charge d'alimentation, un atomiseur d'inhibiteur (8), un tube (6) destiné à fournir un inhibiteur à l'atomiseur et entourant celui-ci, un tube supplémentaire positionné coaxialement, où en vue d'une réduction de la turbulence, ladite unité d'injection est munie d'un passage de tourbillon formé par des plaques radiales (9) et des bagues cylindriques 10, 11, 12, 13, destiné à réduire la turbulence en aval du point d'injection, positionné de façon concentrique à l'intérieur d'un tronçon droit d'un serpentin dans la zone d'injection de solution d'inhibiteur.
  2. Unité d'injection selon la revendication 1, dans laquelle l'atomiseur est un générateur de tourbillons.
  3. Unité d'injection selon la revendication 1, dans laquelle les plaques radiales sont fixées symétriquement au tube supplémentaire, et des bagues cylindriques sont fixées aux plaques radiales coaxialement au tube supplémentaire et forment un passage intérieur, qui s'étend par palier dans le sens de circulation de la charge d'alimentation.
  4. Unité d'injection selon la revendication 3, dans laquelle ledit passage de tourbillon comprend 3 à 5 bagues cylindriques, et la largeur des bagues augmente progressivement dans le sens de l'écoulement de 0,25 à 0,9 fois le diamètre intérieur du serpentin dans le tronçon droit, de la première bague à la dernière bague, en conséquence.
  5. Unité d'injection selon la revendication 3, dans laquelle la distance depuis le bord amont de ladite plaque jusqu'au point le plus proche de la jonction du tuyau de dérivation d'entrée le plus proche destiné à fournir une charge d'alimentation n'est pas inférieure à deux fois le diamètre intérieur du tronçon droit du serpentin.
EP98929942A 1997-10-08 1998-05-18 Unite permettant d'introduire une solution d'inhibiteur de depots de coke dans des fours a tube servant a la pyrolyse d'hydrocarbures bruts Expired - Lifetime EP1036837B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU97117379 1997-10-08
RU97117379A RU2119524C1 (ru) 1997-10-08 1997-10-08 Узел ввода раствора ингибитора коксоотложения в трубчатых печах пиролиза углеводородного сырья
PCT/RU1998/000146 WO1999018172A1 (fr) 1997-10-08 1998-05-18 Unite permettant d'introduire une solution d'inhibiteur de depots de coke dans des fours a tube servant a la pyrolyse d'hydrocarbures bruts

Publications (3)

Publication Number Publication Date
EP1036837A1 EP1036837A1 (fr) 2000-09-20
EP1036837A4 EP1036837A4 (fr) 2002-10-16
EP1036837B1 true EP1036837B1 (fr) 2004-02-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98929942A Expired - Lifetime EP1036837B1 (fr) 1997-10-08 1998-05-18 Unite permettant d'introduire une solution d'inhibiteur de depots de coke dans des fours a tube servant a la pyrolyse d'hydrocarbures bruts

Country Status (20)

Country Link
EP (1) EP1036837B1 (fr)
JP (1) JP2001519456A (fr)
KR (1) KR100438847B1 (fr)
CN (1) CN1163571C (fr)
AT (1) ATE260329T1 (fr)
AU (1) AU745155B2 (fr)
BG (1) BG63947B1 (fr)
BR (1) BR9812885A (fr)
CA (1) CA2306852A1 (fr)
CZ (1) CZ291301B6 (fr)
DE (1) DE69821975T2 (fr)
ES (1) ES2216291T3 (fr)
HU (1) HU222844B1 (fr)
NO (1) NO20001832L (fr)
PL (1) PL339810A1 (fr)
PT (1) PT1036837E (fr)
RU (1) RU2119524C1 (fr)
TR (1) TR200000943T2 (fr)
UA (1) UA45499C2 (fr)
WO (1) WO1999018172A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2222570C1 (ru) * 2002-06-11 2004-01-27 Общество с ограниченной ответственностью "Научно-производственная фирма "ПАЛЬНА" Способ удаления кокса и ингибирования коксообразования в печах пиролиза и устройство для его осуществления
DE102006007061A1 (de) 2006-02-15 2007-08-16 Benq Mobile Gmbh & Co. Ohg Verfahren, mobile Vorrichtung und Computerprogrammprodukt
CN104549071B (zh) * 2013-10-21 2016-10-26 中国石油化工股份有限公司 固定流化床反应器及其使用方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU633892A1 (ru) * 1972-05-30 1978-11-25 Предприятие П/Я Р-6830 Установка дл переработки углеводородного сырь
NL181292C (nl) * 1976-06-08 1987-07-16 Nederlandse Gasunie Nv Inrichting voor het verbeteren van het stromingsprofiel in een gasleiding.
US4708787A (en) * 1986-04-14 1987-11-24 Amoco Corporation Method for supplying a uniform liquid and gaseous mixture
US5284994A (en) * 1993-01-13 1994-02-08 Phillips Petroleum Company Injection of antifoulants into thermal cracking reactors
US5346133A (en) * 1993-03-25 1994-09-13 The M. W. Kellogg Company High temperature liquid injection apparatus
US5435904A (en) * 1994-09-01 1995-07-25 Phillips Petroleum Company Injection of antifoulants into thermal cracking process streams
EP0986621B1 (fr) * 1997-06-05 2002-11-27 ATF Resources, Inc. Procede et appareil servant a retirer du coke et a supprimer la formation de coke au cours d'une operation de pyrolyse

Also Published As

Publication number Publication date
JP2001519456A (ja) 2001-10-23
ATE260329T1 (de) 2004-03-15
PT1036837E (pt) 2004-07-30
DE69821975D1 (de) 2004-04-01
KR20010031011A (ko) 2001-04-16
RU2119524C1 (ru) 1998-09-27
WO1999018172A8 (fr) 1999-07-08
BG104301A (en) 2000-12-29
HUP0003868A3 (en) 2001-05-28
NO20001832L (no) 2000-06-08
BG63947B1 (bg) 2003-07-31
NO20001832D0 (no) 2000-04-07
WO1999018172A1 (fr) 1999-04-15
DE69821975T2 (de) 2004-12-16
CN1163571C (zh) 2004-08-25
PL339810A1 (en) 2001-01-02
CZ291301B6 (cs) 2003-01-15
AU745155B2 (en) 2002-03-14
EP1036837A1 (fr) 2000-09-20
ES2216291T3 (es) 2004-10-16
KR100438847B1 (ko) 2004-07-05
BR9812885A (pt) 2000-08-08
UA45499C2 (uk) 2002-04-15
HUP0003868A2 (hu) 2001-02-28
CA2306852A1 (fr) 1999-04-15
TR200000943T2 (tr) 2002-10-21
HU222844B1 (hu) 2003-12-29
CN1274384A (zh) 2000-11-22
AU7944198A (en) 1999-04-27
EP1036837A4 (fr) 2002-10-16
CZ20001204A3 (cs) 2001-01-17

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