EP1534996A1 - Procede de combustion d'un hydrocarbure liquide - Google Patents

Procede de combustion d'un hydrocarbure liquide

Info

Publication number
EP1534996A1
EP1534996A1 EP03765051A EP03765051A EP1534996A1 EP 1534996 A1 EP1534996 A1 EP 1534996A1 EP 03765051 A EP03765051 A EP 03765051A EP 03765051 A EP03765051 A EP 03765051A EP 1534996 A1 EP1534996 A1 EP 1534996A1
Authority
EP
European Patent Office
Prior art keywords
fuel
process according
combustion
fischer
flame
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.)
Withdrawn
Application number
EP03765051A
Other languages
German (de)
English (en)
Inventor
Frank Haase
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.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP03765051A priority Critical patent/EP1534996A1/fr
Publication of EP1534996A1 publication Critical patent/EP1534996A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • F23C99/006—Flameless combustion stabilised within a bed of porous heat-resistant material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/44—Preheating devices; Vaporising devices
    • F23D11/441—Vaporising devices incorporated with burners
    • F23D11/446—Vaporising devices incorporated with burners heated by an auxiliary flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • the invention is directed to a process for combustion of a liquid hydrocarbon fuel wherein the following steps are performed:
  • step (b) evaporating the liquid hydrocarbon droplets, preferably in a cool flame at a temperature of between 300 and 480 °C, to obtaining a gaseous mixture comprising oxygen and hydrocarbons, and (c) total combustion of the gaseous mixture obtained in step (b) .
  • a disadvantage of the use of Industrial Gas Oil is that the fuel does not easily evaporate in the evaporator space of the burner. Non-complete evaporation of the liquid fuel will result in more emissions in the flue gas leaving the burner. Additionally non-complete evaporation may result in deposits in the combustion zone and . downstream heat exchanger surfaces. This may result in a decrease of efficiency in the heat exchanger, in incomplete combustion or uncontrolled flame ignition.
  • the objective of the present invention is therefore to provide a process, which does not have such a disadvantage. This object is achieved with the following process . : Process for combustion of a liquid Fischer-Tropsch derived hydrocarbon fuel wherein the following steps are performed:
  • step (c) total combustion of the gaseous mixture obtained in step (b) .
  • step (a) a mixture of liquid Fischer-Tropsch derived fuel droplets in a gaseous continuous phase is prepared.
  • the gaseous phase will contain oxygen or any other oxidant.
  • the gaseous phase is preferably air.
  • the preparation of said mixture may be performed by different techniques. For example a mixture is obtained by passing a mixture of air and liquid fuel through small openings at a certain pressure difference resulting in the formation of the small liquid droplets in the gaseous phase.
  • a second technique is by atomization of the ' liquid fuel through ultrasonic vibrations as for example described in US-A-US4264837.
  • a preferred method is wherein the liquid fuel is first atomised by means of a spray nozzle and subsequently mixed with air as for example described in the above-cited article.
  • the size of the droplets will be determined by the method chosen.
  • the dimensions of the nozzle the dimensions of the nozzle, the fuel feed rate, fuel oil pressure, fuel viscosity (and therefore temperature of the fuel) and surface tension will influence the droplet size. Smaller droplets and thus a better evaporation of the liquid fuel will be achieved at higher fuel feed rates and/or higher oil pressures for a given feed nozzle.
  • the droplet size is as small as possible.
  • the high pressures needed to obtain such small droplets may be not economically or technically feasible.
  • Applicants have found that when using Fischer-Tropsch derived fuel larger droplets may be allowed without negatively affecting the combustion. This is very advantageous because now a lower oil pressure may be applied which makes the combustion process technically more simple and more energy efficient .
  • the oxygen containing gas will normally be air.
  • the liquid fuel is preferably introduced into the air as a fine spray of droplets.
  • Step (b) is preferably performed by means of a so-called cool flame.
  • Cool flames sometimes also referred to as cold flames, start at a. temperature of 300 °C and stabilize, virtually independent of the air ratio, at a temperature of 480 °C at 1 bar conditions.
  • a cool flame will be formed when at a certain minimum temperature (300 °C) . If the temperature is kept below 480 °C no auto ignition will occur because the needed activation energy is too high under these conditions. This temperature is suitably maintained by means of indirect heat exchange against either hot exhaust gasses or against the combustion zone. In the cool flame the liquid droplets will evaporate thereby forming a gaseous mixture that is used in step (c) .
  • Steps (b) and (c) in the method according to the present invention are physically separated.
  • measures are taken to avoid hot combustion gases from step (c) to enter the area wherein the cool flame is present.
  • measures are flame traps through for example flow acceleration or metal grids positioned at the physical interface .between step (a) and step (b) .
  • cool flames are described in the above referred to article and in EP-A-947769.
  • steps (a) and (b) may be performed by first evaporation of the fuel and subsequently mixing the gaseous fuel with the oxygen containing mixture,, or by evaporation in an inert medium before mixing with the oxygen containing gas.
  • the combustion in step (c) may be performed in different manners.
  • aerodynamic stabilization of the flame may be applied.
  • the flame is positioned by means of a porous surface, wherein the mixture is provided to one end of said surface and a flame is present just down stream of said surface.
  • An example of such a surface burner is described in EP-A-947769.
  • step (c) Another preferred embodiment for step (c) is wherein the combustion takes place in a porous material as for example described in the above referred to article.
  • the porous material may be as described in the above- described article or as in US-A-5522723. It has been found important that combustion process may take place inside the porous structure. Too small pores will quench the flame and too large pores will cause flame propagation.
  • the porous material is comprised of a first zone wherein flame propagation is suppressed, the so-called pre-heating zone and a second zone wherein flame propagation is possible, the actual combustion zone.
  • the porous material may be made from for example alumina, zirconium oxide or silicium carbide.
  • a flame detector is used.
  • Suitable detectors are the UV sensors and
  • a ' more preferred detector is the so-called ionisation sensor.
  • An ionisation sensor is suitable to monitor burners with intermittent, operation as well as continuous operation. The principle of operation of the ionisation flame monitor is based on the rectifying effect of a flame. If a flame is present, a current flows between the burner and the ionisation electrode. This ionisation current is evaluated by the flame monitor to determine if a flame is present.
  • ionisation sensors could not be used in ⁇ combination with a liquid fuel because deposits in the sensor led to false currents in the sensor. Because use of the Fischer-Tropsch derived fuel, especially a fuel composition not containing a metal based combustion improver results in less deposits ionisation sensors can be applied.
  • metal based combustion improvers are ferrocene based additives and methylcyclopentadienylmanganese-tricarbonyl (MMT) . This is an advantage because these sensors are more readily available than the IR or UV sensors.
  • the Fischer-Tropsch derived fuel will comprise a Fischer-Tropsch product which may be any fraction of the middle distillate fuel range, which can be isolated from the (hydrocracked) Fischer-Tropsch synthesis product. Typical, fractions will boil in the naphtha, kerosene or gas oil range. Preferably a Fischer-Tropsch product boiling in the kerosene- or gas oil range is used because these products are easier to handle in for example domestic environments. Such products will suitably comprise a fraction larger than 90 wt% which boils between 160 and 400 °C, preferably to about 370 °C.
  • Fischer-Tropsch derived kerosene and gas oils are described in EP-A-583836, WO-A-9714768, WO-A-9714769, O-A-011116, WO-A-011117, O-A-0183406, O-A-0183648 , WO-A-0183647, WO-A-0183641, WO-A-0020535, O-A-0020534, EP-A-1101813, US-A-5766274, US-A-5378348, US-A-5888376 and US-A-6204426.
  • the Fischer-Tropsch product will suitably contain more than 80 wt% and more suitably more than 95 wt% iso and normal paraffins and less than 1 wt% aromatics, the balance being naphthenics compounds.
  • the content of sulphur and nitrogen will be very low and normally below the detection limits for such compounds. This low content of these elements is due to the specific process wherein the Fischer-Tropsch reaction is performed.
  • the content of sulphur will therefore be below 5 ppm and the content of nitrogen will be below 1 ppm.
  • the density of the Fischer-Tropsch product will be lower than the conventional mineral derived fuels. The density will be between 0.65 and 0.8 g/cm ⁇ .
  • the fuel used in the process of the present invention may also comprise fuel fractions other than the Fischer- Tropsch product.
  • fuel fractions may be the kerosene or gas oil fractions as obtained in traditional refinery processes, which upgrade crude petroleum feedstock to useful products.
  • Preferred non-Fischer- Tropsch fuel components are the ultra low sulphur (e.g. less than 50 ppm sulphur) kerosene or diesel fractions, which are currently on the market.
  • non-mineral oil based fuels, such as bio-fuels may also be present in the fuel composition.
  • the content of the Fischer- Tropsch product in the fuel will be preferably be above 40 wt%, more preferably above 60 wt% and most preferably above 80 wt% .
  • Fischer-Tropsch product will be optimised, wherein pricing of the total fuel will be balanced with the advantages of the present invention.
  • fuels fully based on a Fischer- Tropsch product plus optionally some additives may be advantageously used.
  • the fuel may also comprise one or more of the following additives.
  • Detergents for example OMA 350 as obtained from Octel OY; stabilizers, for example
  • Keropon ES 3500 as obtained from BASF Aktiengesellschaft, FOA 528A as obtained from OCTEL OY; metal-deactivators, for example IRGAMET 30 (as obtained from Specialty Chemicals Inc; (ashless) dispersants, for example as included in the FOA 528 A package as obtained from
  • Octel OY Octel OY
  • anti-oxidants IRGANOX L06, or IRGANOX L57 as obtained from Specialty Chemicals Inc ; cold flow improvers, for example Keroflux 3283 as obtained from BASF Aktiengesellschaft, R433 or R474 as obtained from Infineum UK Ltd; anti-corrosion: Additin RC 4801 as obtained from Rhein Che ie GmbH, Kerocorr 3232 as obtained from BASF, SARKOSYL 0 as obtained from Ciba; re- odorants, fro example Compensol as obtained from Haarmann & Reimer; biociodes, for example.
  • GROTA MAR 71 as obtained from Schuelke & Mayr; lubricity enhancers, for example OLI 9000 as obtained from Octel; dehazers, for example T-9318 from Petrolite; antistatic agents, for example Stadis 450 from Octel; and foam reducers, for example TEGO 2079 from Goldsch idt.
  • the Fischer-Tropsch derived fuel does not. necessarily have to contain a combustion improver such as for example ferrocene or MMT.
  • the Fischer-Tropsch product is colourless and odourless.
  • an odour marker as for example applied in natural gas for domestic consumption, may be present in the Fischer-Tropsch derived fuel.
  • a colour marker may be present to distinguish the fuel from other non-Fischer-Tropsch derived fuels.
  • the total content of the additives may be suitably between 0 and 1 wt% and preferably below 0.5 wt% .
  • the combustion process using the Fischer-Tropsch fuels is preferably applied for domestic heating, wherein the heat of combustion is used to heat water by indirect heat exchange in so-called boilers.
  • the process is especially suited for domestic applications because of its power modulation range of between 2 and 30 kW.
  • the heated water may be used to warm up the house or consumed in for example showers and the like.
  • the combustion process using the Fischer-Tropsch fuels may advantageously be further used for direct heating of large spaces.
  • Such applications are characterized in that the flue gasses are directly supplied to said space to heat up said space. Spaces such a tents and halls are often heated up with such an apparatus.
  • gaseous fuels for example natural gas, LPG and the like, are used for this application because the associated flue gasses can be safely supplied to said space.
  • a disadvantage of the use of gaseous fuels is however that handling of the pressurized gas containers and combustion equipment requires professional skills in order to operate such an apparatus safely.
  • a Fischer-Tropsch derived liquid fuel a comparable flue gas is obtained in the combustion process as when a gaseous fuel is used.
  • a method is provided wherein a liquid fuel can be applied for direct heating of spaces.
  • the application of the liquid Fischer-Tropsch derived fuel makes the use of the apparatus for direct heating much more simple and safe.
  • the direct heating of spaces is preferably performed by- means of a so-called radiation heater.
  • step (c) is preferably performed at or in the surface of a perforated plate.
  • This plate is preferably a ceramic plate.
  • combustion will take place in the short channels across the plate. The combustion heat will result in a glowing plate generating radiation energy that will heat up the surrounding air.
  • the fuel for such radiation heaters is a gaseous fuel because the flue gasses will also be emitted in the surrounding air.
  • Applicants have now found that also a Fischer-Tropsch fuel may be advantageously applied without the disadvantages of a liquid fuel.
  • Examples of radiation heaters which normally operate on a gaseous fuel but which now can be operated on a liquid fuel are described in US-A-5139415, EP-A-0949452 or EP-A-0037046.
  • the combustion process using the Fischer-Tropsch fuels is preferably applied for domestic heating, wherein the heat of combustion is used to heat water by indirect heat exchange in so-called boilers.
  • the process is especially suited for domestic applications because of its power modulation range of between 2 and 30 kW.
  • the heated water may be used to warm up the house or consumed in for example showers and the like.
  • the combustion process using the Fischer-Tropsch fuels may advantageously be further used for direct heating of large spaces.
  • Such applications are characterized in that the flue gasses are directly supplied to said space to heat up said space.
  • step (c) is preferably performed using a porous surface. The radiant heat developed at the surface of such heaters will heat the environment in which it is placed.
  • the process may also be advantageously applied in a process to generate steam.
  • step (c) is performed in a porous material as described in for example US-A-5522723.
  • the heat of combustion generated by such process can be used to generate steam, which may be used for various purposes, such as heating.
  • a preferred application is described in US-A-2002194848 and O-A-03036072, wherein said generated steam is first super heated and subsequently fed to a piston engine or an expansion engine.
  • This application is sometimes also referred to as the SteamCell of Enginion AG (SteamCell is a trademark) .
  • the engine may provide mechanical power, for example to power an automobile, or electricity.
  • the claimed advantage of this type of engine is low N0 X emissions as compared to the state of the art combustion engines.
  • N0 X emissions may be further reduced in such an application.
  • An additional advantage is that the Fischer-Tropsch derived fuel is practically sulphur free. This can further simplify the design of the burner and reduce the complexity of such an engine.

Abstract

L'invention concerne un procédé de combustion d'hydrocarbures liquides dérivés de Fischer-Tropsch consistant à: (a) obtenir un mélange de gouttelettes d'hydrocarbures liquides dans une phase gazeuse contenant de l'oxygène, (b) évaporer les gouttelettes d'hydrocarbures liquides dans une flamme fraîche à une température oscillant entre 300 et 480 °C afin d'obtenir un mélange gazeux comprenant de l'oxygène et des hydrocarbures et (c) à assurer la combustion totale du mélange gazeux obtenu sous l'étape (b).
EP03765051A 2002-07-19 2003-07-18 Procede de combustion d'un hydrocarbure liquide Withdrawn EP1534996A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03765051A EP1534996A1 (fr) 2002-07-19 2003-07-18 Procede de combustion d'un hydrocarbure liquide

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02016090 2002-07-19
EP02016090 2002-07-19
EP03765051A EP1534996A1 (fr) 2002-07-19 2003-07-18 Procede de combustion d'un hydrocarbure liquide
PCT/EP2003/007863 WO2004010050A1 (fr) 2002-07-19 2003-07-18 Procede de combustion d'un hydrocarbure liquide

Publications (1)

Publication Number Publication Date
EP1534996A1 true EP1534996A1 (fr) 2005-06-01

Family

ID=30470232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03765051A Withdrawn EP1534996A1 (fr) 2002-07-19 2003-07-18 Procede de combustion d'un hydrocarbure liquide

Country Status (7)

Country Link
US (1) US20050244764A1 (fr)
EP (1) EP1534996A1 (fr)
JP (1) JP2005533158A (fr)
AU (1) AU2003250994A1 (fr)
CA (1) CA2493912A1 (fr)
NO (1) NO20050879L (fr)
WO (1) WO2004010050A1 (fr)

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CA2493912A1 (fr) 2004-01-29
WO2004010050A1 (fr) 2004-01-29
NO20050879L (no) 2005-02-18
AU2003250994A1 (en) 2004-02-09
JP2005533158A (ja) 2005-11-04
US20050244764A1 (en) 2005-11-03

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