Energy Analysis in Combined Reforming of Propane

Moon, K.; Kale, Ganesh R.

doi:https://doi.org/10.1155/2013/301265

Journal of Engineering

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Research Article | Open Access

Volume 2013 | Article ID 301265 | https://doi.org/10.1155/2013/301265

Energy Analysis in Combined Reforming of Propane

K. Moon¹and Ganesh R. Kale¹

Academic Editor: Mo Yang

Received30 Nov 2012

Revised21 May 2013

Accepted21 May 2013

Published23 Sept 2013

Abstract

Combined (steam and CO₂) reforming is one of the methods to produce syngas for different applications. An energy requirement analysis of steam reforming to dry reforming with intermediate steps of steam reduction and equivalent CO₂ addition to the feed fuel for syngas generation has been done to identify condition for optimum process operation. Thermodynamic equilibrium data for combined reforming was generated for temperature range of 400–1000°C at 1 bar pressure and combined oxidant (CO₂ + H₂O) stream to propane (fuel) ratio of 3, 6, and 9 by employing the Gibbs free energy minimization algorithm of HSC Chemistry software 5.1. Total energy requirement including preheating and reaction enthalpy calculations were done using the equilibrium product composition. Carbon and methane formation was significantly reduced in combined reforming than pure dry reforming, while the energy requirements were lower than pure steam reforming. Temperatures of minimum energy requirement were found in the data analysis of combined reforming which were optimum for the process.

1. Introduction

Syngas (H₂ + CO) is an important commodity for various applications. It is used as fuel in internal combustion (IC) engines [1–5], raw material for chemical manufacture by FT synthesis to produce hydrocarbons [6–9], for synthesis of liquefied petroleum gas (LPG) [10, 11], gasoline [12], alcohols [13–18], dimethyl ether [19–21], methanethiol [22], and also as a fuel for SOFC in fuel cells [23, 24]. It has been used as raw material as fuel in gas turbines [25–27], for use in coal liquefaction [28], for use in cofiring and reburning in a coal fired boiler [29], and also to synthesize biofuels by syngas fermentation [30].

Solid oxide fuel cell (SOFC) has the unique distinction of using syngas instead of pure hydrogen for electricity generation as it treats CO equivalent to hydrogen in feed [31]. Although some researchers have reported lower efficiencies with CO compared to hydrogen, the cost of pure hydrogen production can always cap these results for cheap power generation from SOFC [32–34].

Steam reforming (SR) [35, 36] and dry reforming (DR) [37] are well-known processes for syngas/hydrogen generation [38]. SR is preferred for hydrogen generation, and DR is preferred for syngas generation. The total moles of syngas generated are of importance for SOFC feed from the hydrocarbon fuel, and these processes generate equivalent amount of syngas from fuels and hence are comparable [39–41]. But both these processes are highly endothermic and also have their inherent drawbacks. SR requires huge energy for steam generation (as water has a huge latent heat of vaporization), while DR process is prone to catalyst deactivation due to coke formation [42] (coke formation in steam reforming is much less). The improvement to these processes was the addition of oxygen to make it thermoneutral (neither endothermic nor exothermic) processes. However addition of oxygen also adds nitrogen which although is inert increases the reactor volumes which increases the capital as well as operating costs. The steam to propane ratio (S/P) in steam reforming and carbon dioxide to propane ratio (CO₂/P) in dry reforming are important feed parameters [43]. Both H₂O and CO₂ supply oxygen to the fuel, and they get reduced to H₂ and CO, respectively, which add up to the syngas moles generated from the carbon and hydrogen of the fuel. These oxidants (Oxs) can be combined in suitable ratios for reforming to lower the energy requirements and avoid carbon formation. This oxidant to propane ratio (Ox/P or OxPR) is a very important parameter in combined reforming. This paper intends to study the energy requirements in combined reforming to find optimum temperature of operation. The study is planned in steps such as to start by pure steam (H₂O) reforming and gradually add CO₂ moles and reduce equivalent H₂O from the feed, and study the process energy trends requirements. Such systematic studies have not been reported in the literature yet (according to the authors). This paper intends to study these conditions and arrive at the optimum points of operation which will immensely benefit the existing fuel processor technology. Propane is a major constituent of liquefied petroleum gas (LPG) which is widely available and hence is chosen for this study [44].

2. Methodology

Reforming reactions are generally equilibrium-limited. The thermodynamic equilibrium data points for the study were generated by HSC Chemistry software ver. 5.1 [45]. This software uses the popular Gibbs free minimization technique to find the equilibrium composition of the system [46–49]. These data points can also be generated by other commercial software like HYSIS, Design II, Aspen Plus. Fluent or also by programming the algorithm in C++, JAVA, or MATLAB. The particular advantage with HSC chemistry is it works using species rather than chemical equations and hence can work in conditions where exact number and nature of chemical reaction equations and intermediate species are not known. The amount of input species and desired output species are to be defined along with temperature and pressure conditions and the software calculates the equilibrium compositions which can be used in the reaction equation module of HSC chemistry to calculate the process enthalpy [50–54]. 1 mole of propane is used as fuel for all conditions in this study while OxPR chosen for this study was 3, 6, and 9 (starting from pure steam reforming and ending to pure dry reforming for OxPR 3, 6, and 9). The intermediate points are combined (H₂O + CO₂)/Propane ratio (OxPR) of 3, 6 and 9 in respective cases. At each ratio condition, the H₂O in feed was gradually decreased (by 1 mole) with equivalent CO₂ addition and equilibrium compositions, and reaction energy was calculated. The feed conditions are shown in detail in Table 1. The calculations were done within 400–1000°C at 1 bar pressure using propane as fuel. The preheating energies of steam, CO₂, and propane were calculated by standard manual techniques using specific heat (Cp) data [55].

3. Results and Discussions

The energy requirements based on equilibrium product compositions for the steam reforming to dry reforming in gradual steps for the oxidant to propane ratio 3–9 were calculated and analysed. The energy requirements included only the preheating and reaction enthalpies assuming that the hot gases can be utilized directly by the SOFC.

3.1. Syngas Production

Syngas (H₂ + CO) is a major product in all reforming processes. The syngas generation potential for a fuel depends on its component hydrogen and carbon moles. Propane (C₃H₈) consists of 3 carbon and 4 hydrogen moles, so the maximum syngas moles that can be obtained by steam reforming and dry reforming processes (individually) are 10 as shown by the following reaction equations: Increase in the moles of H₂O (in SR) and CO₂ (in DR) does not affect the syngas potential of the fuel although it affects the equilibrium syngas moles. The syngas moles produced in combined reforming of reforming for oxidant to propane ratio OxPR 6 (i.e., various conditions ranging from S/Propane = 6 to CO₂/Propane = 6) are shown in Figure 1 in temperature ranging from 400–1000°C. It was observed that the syngas moles increased with increase in temperature from 400 to 1000°C at a constant 1 bar pressure. For example, the syngas moles increased from 1.3045 to 9.9988 moles in pure steam reforming (B10), while the syngas moles increased from 0.4689 to 9.9996 moles in case of pure dry reforming (B16), while for equimolar moles of CO₂ and H₂O (B13), the syngas moles increased from 0.8142 to 9.9990 moles. At a constant temperature, the syngas moles decreased with increase in the moles of CO₂ for temperature up to 800°C, and they become nearly constant to 10.00 moles at higher temperatures. For example, at 600°C, syngas moles decreased from 6.4164 to 3.9080 moles. The minimum syngas moles were produced at 400°C for case B16 (0.4689 moles) while the maximum syngas moles of ~10.00 moles were obtained for all cases above 800°C. Same trends was observed for OxPR = 3 and 9. In case of OxPR = 3, the minimum syngas moles were found to be 0.4638 for case A13 at 400°C and the maximum syngas moles of ~9.85 moles were obtained for all cases at 1000°C, while in OxPR = 9, the minimum syngas moles were found to be 0.4856 for case C19 at 400°C and the maximum syngas moles of ~10.00 were obtained for all cases at 750°C.

3.2. Preheating Energy

Preheating energy is the energy which is required to heat the reactants from the room temperature (generally from 25°C) to the reaction temperature.

Figure 2 shows the variation of preheating energy within the temperature range of 400–1000°C at 1 bar pressure for reactants (propane, steam, and CO₂) of combined reforming of propane for OxPR = 6. It was observed that the preheating energy increased with increase in temperature.

For example, in case of pure steam reforming (B10), preheating energy increased from 384.6027 to 632.5468 kJ for increase in temperature from 400 to 1000°C. In case of pure dry reforming (B16), it increased from 141.5922 to 436.2769 kJ while for equimolar moles of CO₂ and H₂O (B13), it increased from 263.0974 to 534.4119 kJ. At constant temperature, the preheating energy decreased with increase in the moles of CO₂. (It is a valid observation and hence kept as it is.) For example, at 800°C, the preheating energy decreased from 543.4448 to 331.2756 kJ. The minimum preheating energy was found to be 141.5922 kJ at 400°C for case B16 whereas the maximum preheating energy was found to be 632.5468 kJ at 1000°C for case B10. Same trend was observed for OxPRs = 3 and 9. In case of OxPR = 3, the minimum preheating energy was found to be 91.2433 kJ at 400°C for case A13, whereas maximum preheating energy was 387.827 kJ at 1000°C for case A10 (dry reforming condition). While in OxPR = 9, the minimum preheating energy was found to be 191.9410 kJ at 400°C for case C19 and the maximum preheating energy was found to be 877.2667 kJ at 1000°C for C10.

3.3. Reaction Enthalpy

Figure 3 shows the variation of reaction enthalpy within temperature range of 400–1000°C at 1 bar pressure for OxPR = 6. It was observed that the reaction enthalpy increased with increase in temperature.

For example, it increased from 19.332 to 521.401 kJ in case of pure steam reforming (B10), it increased from −42.558 to 672.38 kJ in case of pure dry reforming (B16), and for equimolar moles of CO₂ and H₂O (B13), it increased from −16.721 kJ to 598.876 kJ with increase in temperature from 400 to 1000°C. At lower temperature range (i.e., ~ below 650°C), the reaction enthalpy decreased with increase in CO₂ moles at constant temperature while reverse trend was observed for higher temperature range. For example, at a constant temperature of 500°C, the reaction enthalpy decreased from 114.625 kJ to 19.254, while at 850°C the reaction enthalpy increased from 514.53 to 670.696 kJ. The reaction enthalpies were nearly same in between the temperatures from 650°C to 700°C for all considered cases (i.e., from B10 to B16). The minimum enthalpy was found to be −42.558 kJ at 400°C for case B16, whereas maximum enthalpy was found to be 672.38 kJ at 1000°C in B16. Same trend was observed for OxPR = 3 and 9. In case of OxPR = 3, the minimum enthalpy was found to be −40.87 kJ at 400°C for case A13, while the maximum enthalpy was 624.497 kJ at 1000°C for case A13. At OxPR = 9, the minimum enthalpy was found to be −41.975 kJ at 400°C for case C19 and the maximum enthalpy was found to be 694.467 kJ at 1000°C for C19 case.

3.4. Total Energy per Mole of Syngas

Process energy plays an important role in chemical process development. Both steam and dry reforming are endothermic processes, and their energy requirements are high. The energy required for production of syngas from one mole of propane was calculated as the summation of energy required for preheating the feed and energy required for reaction (reaction enthalpy). It was assumed that the product gases existing at high temperatures can be directly fed to the SOFC, and hence, there is no need to cool down the product gases. Using the data of syngas produced and energy required at different temperatures, this data of energy requirement per mole of syngas produced in each case for OxPR = 3, 6, and 9 was generated. The data for each OxPR case was found to be of the same nature.

Figure 4 shows the variation of total energy per mole of syngas within temperature range from 400 to 1000°C at 1 bar pressure for OxPR = 6. It was observed that the total energy per mole of syngas first decreased to a certain temperature near about 700°C and then increased slightly with increase in temperature. The total energy per mole of syngas decreased from 211.2054 kJ (400°C) to 97.6488 kJ (700°C) and then increased to 110.8701 kJ at 1000°C for pure dry reforming condition (B16). The total energy per mole of syngas decreased from 309.6471 kJ (400°C) to 103.9103 kJ (700°C) and then increased to 115.4086 kJ at 1000°C for pure steam reforming condition (B10), while for equimolar condition (B13), the total energy per mole of syngas decreased from 302.5994 kJ (400°C) to 100.6861 kJ (700°C) and then increased to 113.3401 kJ at 1000°C. At lower temperature, the total energy per mole of syngas initially increased and then decreased with an increase in number of moles of CO₂ in the oxidant (simultaneously decrease in the moles of H₂O) from B10 to B16. For example at 400°C, the total energy per mole of syngas increased from 309.6471 kJ (B10) to 328.2746 kJ (B11) and then decreased to 211.2054 kJ (B16). The minimum total energy per mole of syngas was found to be 97.6488 kJ at 700°C for case of B16, while the maximum total energy per mole of syngas observed was 328.2746 kJ at 400°C for case of B11.

3.5. Optimum Temperature

The optimum temperature of process operation for each case was found by using the data of the energy per mole of syngas curve in the earlier section. The data of the curves was fitted to a MS Excel, and the minimum of the curves was found for their respective optimum temperature (the optimum is for the combined reformer and not the SOFC part, and single stage reforming without WGS is considered in this study). This temperature, at which a minimum of total energy required per mole of syngas produced was observed, was considered to be the best operating temperature for generating syngas at that particular feed condition. Figure 5 shows the optimum temperatures for all reforming cases plotted against minimum energy required to produce 1 mole of syngas in combined reforming of propane. The optimum temperature showed an irregular pattern for increase in CO₂ moles for each case of OxPR. A decrease in the minimum total energy per mole of syngas was observed for an increase in the number of moles of CO₂ in the oxidant feed, which implies that the least energy was required in the case of pure dry reforming. The variation of this optimum temperature was high for OxPR = 3 (715–780°C), but it was low for OxPR = 6 (717–719°C) and was again slightly higher for OxPR = 9 (678–680°C). Table 2 shows the temperatures at which minimum total energy per mole of syngas is obtained at pressure 1 bar.

3.6. Minimum Total Energy per Mole of Syngas at Optimum Temperature

Figure 6 shows the variation of minimum total energy per mole syngas for all OxPR cases = 3, 6, and 9. From the previous discussion of total energy per mole of syngas, it can be observed that the total energy required per mole of syngas reached a minimum value at a certain temperature. With an increase in number of moles of CO₂ in the oxidant feed, it was observed that a decrease in the minimum total energy per mole of syngas which implies that least energy is required in the case of dry reforming in all cases as steam generation is highly energy consuming. For example, at 1 bar pressure, in pure steam reforming condition of OxPR = 3, the minimum total energy per mole of syngas is 88.9909 kJ which reduces to 86.8565 kJ at pure dry reforming. Similarly for OxPR = 6, the minimum total energy per mole of syngas is 103.7013 kJ which reduces to 96.7485 kJ, and for OxPR = 9, the minimum total energy per mole of syngas is 120.832 kJ which reduces to 105.7698 kJ from steam to dry reforming.

3.7. Syngas Moles at Optimum Temperature

The moles of syngas generated at the optimum temperature conditions for all the OxPRs (3–9) were analyzed and plotted in Figure 7. It was observed that the moles of syngas produced decreased from 8.6826 to 6.4853 (for OxPR = 3), but for OxPR = 6, the syngas yield decreased slightly from 9.5362 to 9.3922 and then increased to 9.659, while for OxPR = 9, it slightly decreased from 9.5934 to 9.3930 and then increased to 9.6776. The maximum syngas yield at optimum temperatures was obtained for dry reforming condition for OxPRs 6 and 9, while for OxPR = 3 the maximum syngas moles were generated at optimum temperature for steam reforming. The variation in syngas moles was high for OxPR = 3 while it was low for OxPRs = 6 and 9. The maximum amount of syngas (9.6776 moles) was produced in dry reforming condition of OxPR = 9 at the optimum temperature of 678°C from 1 mole propane at the energy expense of 105.7698 kJ/mole syngas.

3.8. Syngas Ratio at Optimum Temperature

Figure 8 shows the syngas ratio at the optimum temperature with increase in moles of CO₂. It was observed that as the number of moles of CO₂ in the oxidant feed increased, the syngas ratio decreased. For example, in case of OxPR = 6, the syngas ratio decreased from 3.7394 (B10) to 0.4696 (B16). At a constant feed input of CO₂, as the OxPr increased from 3 to 9, the syngas ratio increased. For example, in case of pure steam reforming condition, the syngas ratio increased from 2.5413 (OxPR = 3) to 5.5884 (OxPR = 9). The maximum syngas ratio was found to be 5.5884 at pure steam reforming condition of OxPR = 9, while the minimum syngas ratio was found to be 0.3919 at pure dry reforming condition of OxPR = 9.

3.9. Byproduct Formation at Optimum Temperature

3.9.1. Carbon Formation

Carbon is an undesired component of reforming processes as it deactivates the catalyst and causes pressure drop in the reactors but is mostly produced in reforming processes. Conditions for negligible carbon formation are of importance for process operation. Figure 9 shows the variation of carbon formation at the optimum temperature with increase in moles of CO₂ in combined reforming of propane. Zero carbon formation was observed for OxPRs = 6 and 9, while the carbon formation for OxPR = 3 increased from 0.1786 to 1.4925 moles with increase in moles of feed CO₂. The carbon formation decreased with increase in reforming temperature.

3.9.2. Methane Formation at Optimum Temperature

Methane is also a byproduct of reforming process. Methane formation is sometimes undesirable due to the loss of hydrogen and carbon moles. Figure 10 shows the variation in methane formation at optimum temperature with increase in moles of feed CO₂. It was observed that methane formation decreased for OxPR = 3 while for OxPR = 6 it first increased and then decreased with increase in CO₂ moles, and it showed a mixed trend for OxPR = 9 as the number of moles of CO₂ in the oxidant feed was increased. For example, the methane formation decreased from 0.2401 to 0.1324 moles in the case of OxPR = 3, and for OxPR = 6 it first increased from 0.116 to 0.1520 moles and then decreased to 0.0819 moles. The minimum methane formation was found to be 0.0804 moles for OxPR = 9 (C19) while the maximum methane moles were obtained (0.2401 moles) for OxPR = 3 (A10).

Tables 3, 4, and 5 show the product composition for the temperature at which minimum total energy per mole of syngas was obtained for OxPRs = 3, 6, and 9.

3.10. Feed Conversions

Propane was found to be completely converted (100%) in all the considered cases. The feed CO₂ and H₂O conversions are discussed below.

3.10.1. Carbon Dioxide Conversion at Optimum Temperature

Figure 11 shows the variation of CO₂ conversion at optimum temperatures for combined reforming of propane. From the figure, it was observed that as the number of moles of CO₂ in the oxidant feed increased, the CO₂ conversion first increased and then decreased for OxPR = 3 while it increased with increase in CO₂ moles or OxPRs = 6 and 9. For example, in the case of OxPR = 3, the CO₂ conversion first increased from 75.59% to 77.78% and then decreased to 66.64%, while for OxPR = 6, it increased from −15.03% to 61.01% and it increased from −89.21% to 44.82% for OxPR = 9. Considering all the cases of OxPR from 3–9, the maximum CO₂ conversion was found to be 77.78% at 760°C for case B12 and the minimum CO₂ conversion was found to be −89.21% at 684°C for case C11. The negative CO₂ conversion shows the net CO₂ generation in the reforming system.

3.10.2. Steam Conversion at Optimum Temperature

Figure 12 shows the variation of H₂O conversion at optimum temperatures for combined reforming of propane. From the figure, it was observed that as the number of feed moles of CO₂ in the oxidant feed was increased, the H₂O conversion decreased for all OxPRs. For example, in the case of OxPR 3, H₂O conversion decreased from 90.36% to 57.96%, while for OxPR = 6, it decreased from 62.60% to 4.97%, and it decreased from 48.23% to −40.94% for OxPR = 9. Considering all the cases of OxPR 3–9, the maximum H₂O conversion was found to be 90.36% at 780°C for case B10 and minimum was found to be −40.94% at 670°C for case C18. The negative H₂O conversion shows the net H₂O generation in the reforming system.

4. Conclusion

The thermodynamic energy analysis of combined steam and dry reforming of propane with intermediate steps was studied in this paper. The optimum temperatures (optimum temperature for reformer operation is considered in this study) at which minimum total energy required to produce 1 mole syngas obtained in all cases of OxPRs = 3, 6, and 9 for combined reforming were found in each case. The combined reforming process at OxPR = 3 although gave the lowest energy requirement per mole of syngas generated, carbon formation was observed at those process conditions, and hence those conditions may not be used for fuel processor operation for SOFC. The minimum energy per mole of syngas produced was direct proportional to the oxidant moles used in the process while it had an inverse relation to the optimum process temperature. Dry reforming cases produced more syngas than steam reforming cases at OxPRs = 6 and 9 but the trend was reverse at OxPR = 3. Carbon and methane were the imminent byproducts in combined reforming. Zero carbon formation was observed for OxPRs = 6 and 9. The syngas generated at the optimum conditions had ratio between 1 and 5 and can also be used for petrochemical manufacture by the Fischer-Tropsch synthesis. At optimum conditions, the maximum moles of syngas obtained were 9.6776 for OxPR = 9 at 678°C, and minimum (zero) carbon formation was observed in OxPR OxPRs 6 and 9 while minimum methane formation of 0.0804 moles at OxPR = 9 was observed. The maximum CO₂ conversion was observed to be 77.78% while the maximum H₂O conversion was observed to be 90.36% in OxPR = 3 condition.

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Copyright © 2013 K. Moon and Ganesh R. Kale. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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