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Method for restricting and slowing oil heating furnace high-temperature molten salt corrosion

A high-temperature molten salt, heating furnace technology, used in the treatment of equipment corrosion/fouling inhibition, fuel, petroleum industry and other directions, can solve the problem of low combustion-promoting performance of additives, and achieve the purpose of enhancing combustion-promoting performance, inhibiting corrosion and prolonging service life. Effect

Inactive Publication Date: 2009-04-22
SINOPEC LUOYANG PETROCHEM ENG CORP
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Problems solved by technology

[0004] The present invention aims at the disadvantages of low combustion-promoting performance of additives in the prior art, and provides a method for inhibiting and slowing down the corrosion of high-temperature molten salts in fuel oil heating furnaces. The application of this method can effectively inhibit and slow down the impact of high-temperature vanadium molten salts in heating furnaces on the furnace tubes of heating furnaces. corrosion, prolong the service life of the furnace tube, and effectively inhibit the formation of cohesive scale

Method used

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  • Method for restricting and slowing oil heating furnace high-temperature molten salt corrosion

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Effect test

Embodiment 1

[0012] Preparation composition (lanthanum trioxide 70% by weight, cerium oxide 20% by weight, neodymium trioxide 10% by weight), with respect to simulated ash (50 mol% V 2 o 5 +50 mol%Na 2 The molar numbers of vanadium in O) are respectively 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, mixed with simulated ash, made into 6 kinds of samples, ground, passed through a 100 mesh sieve, and put into a high-temperature box-type resistance furnace for heating , the initial temperature is 500°C, and the maximum temperature is 1200°C. The temperature interval is 20°C, and each temperature point is kept for 15 minutes to investigate the state of each sample at different temperatures and record the change of melting point; the temperature interval is 10°C near the melting point in order to determine the change of ash melting point more accurately. see test results figure 1 . figure 1 It shows that when the addition amount of the composition is 1.0, the simulated ash melting point increases to 1170°C...

Embodiment 2

[0014] Preparation composition (lanthanum trioxide 65% by weight, cerium oxide 30% by weight, neodymium trioxide 5% by weight), the simulated combustion ash composition is shown in Table 1, with the molar number of the composition relative to the vanadium in the simulated combustion ash The molar ratio is 1.0 and mixed with the simulated combustion ash, take 10g of the mixture, add 40-50ml of absolute alcohol, and stir evenly. Then 20g carbon steel is aluminized, Cr 5 The Mo aluminized test piece is immersed in the above suspension for several times, so that the bonded simulated dirt layer is about 20mg / cm 2 , high temperature test at 750°C, the test period is 96 hours, take out and weigh after the test, and calculate the corrosion rate by weight gain. Corrosion data results are shown in Table 2. The data in Table 2 shows that the composition can well inhibit the corrosion of simulated combustion ash.

[0015] Table 1 Composition of simulated combustion ash

[0016] ...

Embodiment 3

[0020] Weigh 2430g of 5% aqueous sodium hydroxide solution and 547.2g of isooctanoic acid, add them into the flask, heat to 75°C for 30 minutes, take 122.7g of lanthanum chloride, 73.98g of cerous chloride, and 50.14g of neodymium chloride to prepare 4950g of aqueous solution was added to the reaction flask together with 2748g of diesel oil, heated to 75°C for 30 minutes, and the oil phase was separated to prepare additive composition A.

[0021] The synthetic additive composition A was mixed into the vacuum residue (specific gravity 0.951g / cm2) with a content of 30 μg / g 3 , freezing point 44°C, residual carbon 19.07%, sulfur content 0.06%), use a thermal analyzer to heat to 550°C under the conditions of 30ml / min air flow and a heating rate of 85°C / min, and keep warm to measure the DTA curve . Calculate the half-life of the carbonaceous body from the DTA curve, and then use the formula of Shibata et al. to calculate the burning rate:

[0022] 1 / (σm)·(dm / dt)=1 / (tσ)·ln(m1 / m2) ...

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Abstract

The invention discloses a method for repressing and slowing high temperature fused salt corrosion of a fuel heating furnace. A combination adjuvant used in this method is composed by 50-80% by weight of lantahanum compound, 10-30 wt% of cerium compound and 5-20 wt% of neodymium compound, these three metal compounds are metallic oxide or organic acid salts, when using oxide of lantahanum, Ce and Nd, sprinkling thereof directly in oven chamber of the heating furnace or palce eroded by high temperature fused salt, when using organic acid salts of these three metal, adding thereof fuel oil in content of 20-3000 mug / g, calcualted by total weight of fuel oil. The method can repress and slow effectively high temperature vabadium fused salt corrosion of furnace pipes of the fuel heating furnace to prolong service life of furnace pipes and repress effectively generation of bonding filth.

Description

technical field [0001] The invention belongs to a method for suppressing and slowing down corrosion in hydrocarbon oil processing equipment, in particular to a method for suppressing and slowing down high-temperature molten salt corrosion of a fuel oil heating furnace. Background technique [0002] The existing additives for inhibiting and mitigating high-temperature molten salt corrosion of fuel oil heating furnaces are generally Mg-based additives. S.N.Tiwari and S.Parakash (Materials Science and Technology (1998, V14)) discussed the corrosion of molten ash on alloys, MgO molten ash corrosion inhibitors, and the mechanism of action of MgO molten ash corrosion inhibitors. [0003] S.N.Tiwari and S.Parakash believe that the long-term high-temperature corrosion of boilers, steam turbines, and heating furnaces that use heavy oil as fuel is related to the Na, V, and S contents in fuel oil. The interaction between Na, V and S can generate low melting point compounds, specifical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G75/02C10L1/188
Inventor 于凤昌徐晓徐静孟庆凯孙志钦郑战利李朝发张宏飞
Owner SINOPEC LUOYANG PETROCHEM ENG CORP
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