A comprehensive investigation of refinery preheaters foulant samples originated by heavy crude oil fractions as heating fluids

Behranvand, Elaheh; Mozdianfard, Mohammad Reza; Díaz-Bejarano, Emilio; Coletti, Francesco; Orzlowski, Pawel; Macchietto, Sandro

doi:10.1016/j.fuel.2018.03.077

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…Further information on the experimental analysis methods used is reported in refs. [44,58]. The tubes in the E155AB exchangers were reported to be heavily blocked.…”

Section: Deposit Appearance and Analysismentioning

confidence: 99%

“…The composition of nine species in the deposit (Ca, O, Na, Mg, Si, S, Cl, Ca, Fe) was measured at various distances from the deposit surface along a radius by Scanning Electron Microscopy with Energy-Dispersive X-ray spectroscopy (SEM-EDX) for a tube slice (Sample 1). The detailed experimental procedure and analysis results are reported elsewhere [58]. The SEM image of the deposit is shown in Figure 10 Although SEM-EDX is not aimed at providing accurate quantitative measurement of the local concentration, the % weight radial profile of the 9 species was used to estimate the organic and inorganic fractions at each point through the deposit.…”

Section: Experimental Analysismentioning

confidence: 99%

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Organic and inorganic fouling in heat exchangers – Industrial case study: Analysis of fouling state

et al. 2017

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A comprehensive model-based thermo-hydraulic methodology is used to investigate fouling behaviour in refinery heat exchangers where high concentration of inorganics in the deposits was reported. The method combines a data-driven analysis of plant measurements (including pressure drop) with a model-based analysis using advanced models of shell-and-tube heat exchangers undergoing fouling. A deposit model capable of tracking composition and deposition history was extended to include thermal-conductivity mixing models appropriate for various deposit structures. Substantial new and useful information can be extracted from the plant measurements in comparison to current practice: the thickness, the effective conductivity, and the radial conductivity and composition profiles of the deposits, reflecting the exchanger operation history. Episodes of rapid and acute fouling, and deposition of inorganic materials could be identified and quantified. A validation of the approach was carried out by (i) a comparison of averaged predicted and experimental inorganic weight fractions in a mixed deposit sample collected at the end of run, and (ii) an initial comparison of predicted radial inorganics profiles and experimental ones (obtained with SEM-EDX) in deposits from similar exchangers. Both steps yielded surprisingly good agreement. The study indicates that the method employed represents a new powerful, model-based analysis tool for monitoring, diagnosis and troubleshooting of fouling in heat exchangers

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“…Further information on the experimental analysis methods used is reported in refs. [44,58]. The tubes in the E155AB exchangers were reported to be heavily blocked.…”

Section: Deposit Appearance and Analysismentioning

confidence: 99%

Section: Experimental Analysismentioning

confidence: 99%

Organic and inorganic fouling in heat exchangers – Industrial case study: Analysis of fouling state

et al. 2017

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“…While this paper focuses on the study of the insidetube deposit, the reader is referred to ref 29 for a detailed description and study of the shell-side deposits produced by heating streams. 29 2.2. Visual Inspection.…”

Section: Methodsmentioning

confidence: 99%

“…A 50 cm piece was then cut off from one of the tube separated parts and selected randomly for characterization (see Figure d). While this paper focuses on the study of the inside-tube deposit, the reader is referred to ref for a detailed description and study of the shell-side deposits produced by heating streams …”

Section: Methodsmentioning

confidence: 99%

Cross Sectional Examination of a Fouled Tube Removed from a Crude Oil Preheat Exchanger

Behranvand

Mozdianfard

Díaz-Bejarano

et al. 2019

Ind. Eng. Chem. Res.

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A first attempt is presented to characterize intact foulant of a refinery preheater. A tube was removed from an exchanger located post-desalter and preflash-drum at a 4-year shutdown, and dissected into undisturbed cutout rings. Following visual inspection, elemental analysis (x-ray maps and line scans) was carried out and radial concentration profiles of the existing elements were established. A stratified coloured foulant layer inside the tube appeared in sine waves fluctuating at both axial and angular directions, likely evidencing for the first time a shadow effect and erosion process. Results agreed with our studies on a comparable exchanger of the same refinery. They confirm the proposed deposition mechanism and simulation results, indicating: formation of a stratified foulant consisting inorganics ranging 50wt%; presence of an acute inorganic deposition period along the chronic organic-inorganic fouling; and identification of foulant phases arrangement, amongst possible conductivity mixing models, as cocontinuous and effective medium theory structures.

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“…Test the overall architecture of the system In this paper, the electronic control unit of the system uses Freescale's 32-bit control chip MPC5554 as the main control processor(Behranvand et al 2018), which can meet the real-time and large data processing requirements of the engine. With a clock speed of up to 132 MHz, it has two Enhanced Time Processor Units (eTPUs) and a 64-channel eDMA controller that can perform tasks such as fuel injection and AD acquisition without taking up core time resources.…”

mentioning

confidence: 99%

Integrated Parameter Test System for Dual Fuel Engines of Special Heavy Vehicles

2019

IJOMAM

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The comprehensive parameters of a dual-fuel engine for special heavy vehicles directly reflect vehicle performance. This paper takes the Yuchai YC6K420 series of inline six-cylinder CNG/dual fuel engine special heavy-duty vehicles as an example to build the comprehensive parameter test system for the engine. The PXI 6251 capture card is used to acquire engine analog signals. The fuel consumption and gas consumption meters of three German Endress + Hauser (E + H) companies are combined to measure, display and store fuel consumption and gas consumption data. The system data acquisition program mainly includes channel creation, configuration and signal acquisition, which can realize system data reading, filtering conditioning, display and save. The electronic control unit in the system uses the periodic interrupt to send and receive data, and analyzes the data transmitted by the CAN communication module of the controller area network through the data feedback function. The data is restored to its true value and displayed graphically. The test results show that the system can effectively detect the temperature of the vehicle's dual fuel engine. At the same time, it can be learned that the in-cylinder combustion of the dual fuel engine is relatively flat, and the maximum combustion heat release rate is relatively low; when the load and the rotational speed are low, the combustion duration is relatively long. Keeping other conditions constant, reducing only the nozzle flow area is not conducive to improving the combustion characteristics of the dual fuel engine.

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A comprehensive investigation of refinery preheaters foulant samples originated by heavy crude oil fractions as heating fluids

Cited by 10 publications

References 13 publications

Organic and inorganic fouling in heat exchangers – Industrial case study: Analysis of fouling state

Organic and inorganic fouling in heat exchangers – Industrial case study: Analysis of fouling state

Cross Sectional Examination of a Fouled Tube Removed from a Crude Oil Preheat Exchanger

Integrated Parameter Test System for Dual Fuel Engines of Special Heavy Vehicles

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