Method of operating a combusion installation and use of such a method for inhibiting vanadium corrosion
a technology of thermal installation and combusion, which is applied in the direction of fuels, solid fuel combustion, lighting and heating apparatus, etc., can solve problems such as corrosion
Inactive Publication Date: 2013-08-22
MESKERS JR DONALD A +2
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Benefits of technology
The patent describes a method for operating a combustion installation that uses fuel containing vanadium. The method involves adding boron compounds and magnesium compounds to the combustion chamber in specific amounts. This results in a specific ratio of magnesium oxide to vanadium oxide and a specific ratio of boron oxide to vanadium oxide. This ratio is important because it affects the formation of certain compounds during combustion. The technical effect is to improve the performance and efficiency of combustion in combustion installations using fuel containing vanadium.
Problems solved by technology
However, the presence in these oil fractions of organo-vanadium compounds mainly in the form of vanadium porphyrins generates corrosion problems in metal alloys and ceramics that are used as structural materials or as surface coatings (protective layers or thermal barriers) in parts of these installations exposed to the combustion gas.
Method used
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example 1
[0060]A combustion installation, such as a boiler, has a furnace temperature of 570° C., and produces steam by burning an average of 2,000 kg / hr of a very degraded heavy fuel oil containing 200 ppm vanadium by mass (generating thus 3.926 mole / hour of V2O5). Such boiler is treated with an oil soluble inhibitor containing 15.5% by weight of magnesium and 3.45% by weight of boron. The injection flowrate of the inhibitor is 2.46 kg / hr, representing:[0061]0.381 kg / hr or 15.67 mole / hr of magnesium; so: m=15.67 / 3.926=4.00[0062]0.085 kg / hr or 7.87 mole / hr of boron i.e. 3.93 mole / hr of B2O3; so: b=3.93 / 3.926=1.0.[0063]These dosage conditions satisfy the relation “m=2+2b” lying in the “most preferential application domain”.
[0064]During an operation period of 1200 hours, the average thermal power of the boiler is potentially 19.59 MW thermal, meaning an average efficiency of about 86%. After this period, furnace wall tube slagging is solid and friable. Slagging and superheater fouling are cont...
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Abstract
A method of operating a thermal installation other than a gas turbine and use of such a method for inhibiting vanadic corrosion is disclosed herein. Embodiments of the invention relate to a method of operating a thermal installation comprising a combustion chamber fed with a fuel contaminated with vanadium, with sulfur and possibly with sodium. The combustion chamber is also fed with boron and with magnesium, in quantities such that the magnesium molar ratio m=MgO / V2O5 and the boron molar ratio b=B2O3 / V2O5 satisfy the conditions (i) m≧2+b; (ii) m≦3+2b; (iii) b≧0.5 and (iv) b≦2, so that the combustion products comprise magnesium vanadate, mixed magnesium boron oxide and possibly sodium borate.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a national stage application under 35 U.S.C. §371(c) prior-filed, co-pending PCT patent application serial number PCT / US11 / 54696, filed on Oct. 4, 2011, which claims priority to U.S. provisional patent application No. 61 / 389,570 filed on Oct. 4, 2010, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Embodiments of the present invention relate to the protection against vanadic corrosion of thermal installations that are operated differently from gas turbines and burn vanadium-contaminated liquid fuels. It relates in particular to a method of operating a thermal installation, for example a steam boiler, fed with this type of fuel.[0003]From an economic standpoint, it is becoming increasingly advantageous to utilize, in energy applications, certain low-value petroleum fractions such as: very heavy crude oils, distillation residues (from atmospheric or vacuum distillation), by-products...
Claims
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IPC IPC(8): C10L1/12F23J7/00
CPCC10L1/1216C10L1/1233F23J7/00C10L1/12C10L1/1291
Inventor MESKERS, JR., DONALD AMOLIERE, MICHELBUET, JEANLUC
Owner MESKERS JR DONALD A