Fuel additive composition and its preparation

a technology of additive composition and composition, which is applied in the direction of fuel additives, liquid carbonaceous fuels, petroleum industry, etc., can solve the problems of corrosive low-melting slag, vanadium, catastrophic formation of vanadium, etc., and achieves rapid chemical reaction, reduced density, and increased porosity

Inactive Publication Date: 2006-03-23
SYSTEMSEPARATION SWEDEN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] The present invention is based on the discovery that crystalline particles of inorganic oxygen-containing metal compounds which when suddenly being subjected to high temperatures almost “explosively” liberate a gaseous substance by evaporation, such as water vapour or carbon dioxide in case of e.g. magnesium hydroxide and magnesium carbonate, respectively, and are converted to particles of the corresponding metal oxide having a structure of increased porosity and reduced density when compared to a corresponding oxide prepared by evaporation of gas at considerably lower temperatures. This makes the oxide better suited for reaction with vanadium pentoxide will percolate easier into the more porous particles. The presence or formation of such more porous particles admits a faster chemical reaction due to the fact that the ions of V2O5 can travel much faster from the surface of the porous particles along the pores surface of the lattice of said particles as vanadate forms than in the denser lattice of non or low porous crystalline oxide.

Problems solved by technology

Fuels such as unrefined crude oil and residual oil containing large amounts of impurities, which result in corrosive deposits in apparatuses driven by the combustion of such fuel.
One such impurity is vanadium, which forms catastrophically, corrosive low-melting slag.
Said slag can destroy vital parts within a short time.
In gas turbines metal temperatures can be higher than 1000° C. at which temperatures corrosion can proceed very fast so that the hot section may be destroyed within a week if no measures are taken to inhibit the corrosion cycle.
Moreover, these prior art compositions give a dense vanadate deposit the removal of which may cause some trouble.
Such slurries do not allow chemical high efficiency inhibition for ash melts due to the large crystal size.
In addition such slurries have a limited stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 1 & 2

Materials used in Examples 1 & 2

[0102] The magnesium hydroxide used was Ankermag®-HH from Magnifin Magnesiaprodukte GmbH, Austria. The magnesium powder contains >98.0% by weight (wt %) Mg(OH) 2 and 2 / g equivalence a mean size for a dense sphere diameter range from 200-260 nm or in fact the largest diameter of the thin flakes crystals average ˜500 nm. The crystals D50 diameter is ˜900 nm, i.e. the median size diameters in the distribution. In addition the crystal agglomerate upper limit diameter is less than approximately 50 microns. The preparation process according to the invention admits feeding by much larger particles, preferably a surface area above >3-4 m2 / g.

[0103] The dispersant used was Rhodafac® RE 610, from Rhodia Inc, France, which is characterized by the manufacturer as nonylphenol ethoxylate based phosphate esters.

[0104] Rape-oil methyl ester was supplied by Svenska Ekobränslen AB, Sweden.

example 1

Preparation of Fuel Additive Composition-Batch of 1000 kg

[0105] 20 kg of Rhodafac® RE610 and 270 kg of rape-oil methyl ester (RME) having a moisture content of <0.05% by weight were mixed in a dissolver vessel (Disolver DTM49 from Westerlins Maskinfabrik AB, Malmö, Sweden) to a homogenous mixture.

[0106] Then 690 kg of magnesium hydroxide powder dried to a moisture content of <0.5% by weight were gradually added under continued mixing allowing the temperature to rise to about 50° C. to form a premix.

[0107] The premix was then transferred to the vessel of a basket mill (Turbomill® 2, from Mirodur SpA, Aprilia, Italy, with an engine effect of 55 kW) containing balls of zirconium having a diameter of 0.8 mm as the grinding medium and rotation of the basket was started and speeded up to full power loading.

[0108] The temperature was allowed to increase to 75° C.-85° C., i.e. securely below the upper limit where the reduced viscosity achieved by the increase in temperature will allow t...

example 2

Preparation of Fuel Additive Composition-Batch of 1000 kg

[0112] 40 kg of a Rhodafac® RE610 and 270 kg of diesel (class 1) were mixed in a dissolver vessel (Disolver DTM49 from Westerlins Maskinfabrik AB, Malmö, Sweden) to a homogenous mixture

[0113] Then 690 kg of magnesium hydroxide powder dried to a moisture content of <0.5% by weight were gradually added under continued mixing allowing the temperature to rise to about 50° C. to form a premix

[0114] The premix was then transferred to the vessel of a basket mill (Turbomill® 2, from Mirodur SpA, Aprilia, Italy, with an engine effect of 55 kW) containing balls of zirconium having a diameter of 0.8 mm as the grinding medium and rotation of the basket was started and speeded up to full power loading.

[0115] The temperature was allowed to increase to 75° C.-85° C., i.e. securely below the upper limit where the reduced viscosity achieved by the increase in temperature will allow the balls of the milling medium to touch each other by cha...

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Abstract

A fuel additive composition for the reduction/removal of vanadium-containing ash deposits in gas turbines and other by combustion of vanadium-containing fuel driven apparatuses, which composition as its active ingredient comprises a compound of a metal capable of forming a vanadate with vanadium of said ash deposits is disclosed.

Description

TECHNICAL FIELD [0001] The present invention relates to a fuel additive composition for the reduction / removal of vanadium-containing ash deposits, a process for the preparation of such a composition and the use of certain inorganic oxygen-containing metal compounds as a component of such a composition. More particularly the present invention relates to a fuel additive composition for the reduction / removal of vanadium-containing ash deposits in gas turbines and other by combustion of vanadium-containing fuel driven apparatuses, a process for its preparation and the use of certain inorganic oxygen-containing metal compounds as an active component thereof. BACKGROUND ART [0002] Fuels such as unrefined crude oil and residual oil containing large amounts of impurities, which result in corrosive deposits in apparatuses driven by the combustion of such fuel. One such impurity is vanadium, which forms catastrophically, corrosive low-melting slag. Said slag can destroy vital parts within a s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/12C10L10/00C10L10/04
CPCC10L1/1216C10L10/04C10L10/00C10L1/1233C10L10/06
Inventor WALLENBECK, ANDERSFORSBERG, BJORNSTROM, GUNNAR
Owner SYSTEMSEPARATION SWEDEN AB
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