Apparent kinetics of the catalyzed water–gas shift reaction in synthetic wood gas

Plaza, Antonio Morales; Fail, Silvester; Cortes, José Apolinar; Föttinger, Karin; Diaz, N.; Rauch, Reinhard; Hofbauer, Hermann

doi:10.1016/j.cej.2016.04.152

Cited by 8 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model obtained was considered good. Similar results were also obtained by Plaza et al (2016) for different operation conditions. However, they were not able to determine the minimum amount of H 2 S required for superior performance of the Co-Mo-based catalyst.…”

supporting

confidence: 87%

See 1 more Smart Citation

Projeto de um reator de deslocamento gás-água com troca térmica integrada e uso de calor residual

Pirovani Paixão

View full text Add to dashboard Cite

In the past decades, there has been a growing concern about alternative energy sources. Power cycles developed during the industrial revolution require thermal sources with elevated temperatures to achieve an acceptable efficiency. Therefore, some of the heat generated in chemical and power plants is unsuitable for such cycles. In the chemical industry, several exothermic chemical reactions take place and the heat released by them must be removed to obtain better conversions. This heat is usually used to produce low pressure steam, which has a low capital value if there is no immediate application. In Part I of this work, a design procedure for a multitubular catalytic reactor for the Water-Gas Shift Reaction (WGSR) is proposed. WGSR is an exothermic reaction conducted in two adiabatic reactors with intermediate cooling so that it can achieve the desired conversion. The goal is to study the feasibility of replacing the usual configuration by one reactor with integrated heat exchange. Firstly, a catalyst screening procedure was carried out and the Cu-based catalyst was chosen as the most appropriate one. The reactor was modeled considering mass and heat transport phenomena. In addition, gas behavior was modeled by the Peng-Robinson-Stryjek-Vera equation of state. After proper validation against experimental and industrial data, the model was used in an optimization procedure for 3 different cases (OPT1, OPT2 and OPT3). The optimization results have upmost shown that using the multitubular reactor within the low temperature range of 430 K to 520 K is disadvantageous because of the considerable increase in the catalyst required amount. However, the use of such reactor tends to be desirable if a more active catalyst is used or for a more exothermic reaction. In Part II, a thermoeconomic assessment was carried out. The Part I's reactor cooling fluid was used as heat source for either e regular Organic Rankine Cycle (ORC) or for a recuperative one (RORC). By considering the heat source temperature, environmental and safety aspects, from 78 initial potential working fluids, 6 were selected. After the power cycle simulations, methanol and ethanol had shown the best performance in the ORC configuration, whereas the other fluids performance became competitive only with the addition of a recuperator (RORC). In the economic analysis, net power generation plays a major role. For case OPT2 (≈250 kW net) and OPT3 (≈850 kW net), the power generation revenue was insufficient to cover the operational expenses, yielding unfeasible scenarios. However, for OPT1 (≈2.5 MW net), economic feasibility was achieved even for low operating pressures. Power cycle thermoeconomic performance was the best for methanol as working fluid. In the best scenario, an attractive internal rate of return of 14.5% and a pay-back period of 7 years were achieved.

show abstract

supporting

confidence: 87%

“…Plaza, A et al (2016). "Apparent kinetics of the catalyzed water-gas shift reaction in synthetic wood gas".…”

mentioning

confidence: 99%

Projeto de um reator de deslocamento gás-água com troca térmica integrada e uso de calor residual

Pirovani Paixão

View full text Add to dashboard Cite

show abstract

“…The mole balance for species “ i ” in the particle is given by eq . r WGS ′ in eq represents the reaction rate for the sour WGS reaction over the Co–Mo/γ-Al 2 O 3 catalyst, and the rate expression is given by eq …”

Section: Methodsmentioning

confidence: 99%

“…r WGS ′ in eq 16 represents the reaction rate for the sour WGS reaction over the Co−Mo/γ-Al 2 O 3 catalyst, and the rate expression is given by eq 17. 27 i k j j j j j j y The boundary conditions for solving eq 16 are given by eqs 18 and 19, while the initial condition is given by eq 20.…”

Section: = K D Dmentioning

confidence: 99%

Dynamic Modeling and Optimization of a Fixed-Bed Reactor for the Partial Water–Gas Shift Reaction

Kherdekar

Roy

Bhatia

2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

This work presents an approach for the model-based design of a load-flexible fixed-bed reactor for performing the partial water–gas shift (WGS) reaction in the gas cleanup section of a coal-to-methanol plant. Three optimization problems with various combinations of objective functions (H2/CO ratio, pressure drop, and operating costs) are formulated and solved using the nondominated sorting genetic algorithm (NSGA-II) to obtain the Pareto-optimal fronts, and the selected solutions are subjected to dynamic stability analysis. The optimum values of decision variables such as the weight of the catalyst, catalyst particle size, ratio of the reactor length and diameter, feed gas temperature, and steam to CO ratio are estimated and are found to be dependent on the choice of the objectives and tolerable deviation from their required values. The dependence of the H2/CO ratio on the inlet gas temperature varies with the choice and combination of the objectives. In contrast, higher values of the steam to CO ratio (S/C) are associated with a lower deviation from the desired H2/CO ratio for all three cases. However, optimum values of S/C are found to be below 1:1 because of its effect on the pressure drop and operating costs. The solutions obtained in the equilibrium-limited regime are found to be more stable in the presence of fluctuations in the feed flow rates but show intermediate stability with fluctuations in the inlet gas temperature. Four designs are recommended as the feasible designs, and the criteria of their application are discussed. Even though the work is related to a WGS reactor, the methodology used can be applied for the design of any other reactor system operating under variable feed conditions.

show abstract

“…This is due to the reaction rate model found for the sour shift catalyst predicting very low reaction rates in the temperature range of the LTSR as shown in Table 6. This puzzling result indicates that the chosen CoMo catalysts would be effective only in the temperature ranges well above the LTSR temperature [35] and other sulphur-resistant catalysts must be taken for the LTSR. Such catalysts may be commercially available, but to the best of our knowledge their reaction rate models have not been reported in open literatures yet.…”

Section: Comparison Of the Sweet And Sour Shift Reactorsmentioning

confidence: 99%

The implications of choice between sour and sweet shift on process design and operation of an IGCC power plant integrated with a dual-stage selexol unit

Zhang

Ahn

2019

Energy

View full text Add to dashboard Cite

In this study, it was sought to design and evaluate two process configurations of an Integrated Gasification Combined Cycle (IGCC) integrated with a dual-stage Selexol unit in which they differ in that one IGCC is configured with sour shift and the other is based on sweet shift. Incorporating water gas shift reactors consuming vast amount of shift steam into an IGCC involves significant alternations to the associated steam cycle, in addition to simply changing the location of the H2S removal step around the shift reactors. It turned out that the sweet shift case would require approximately 4.6 times more shift steam than the sour shift case, as the syngas after H2S removal did not have much steam in it. However, the energy penalties incurred by the carbon capture integration were estimated almost identical regardless of the choice between the sour and sweet shift. This is because the sour shift case would also undergo considerable reduction in power generation at steam cycle due to water quenching. In both shift cases, the high and low temperature shift reactors were sized using the reaction rate models reported in literatures.

show abstract

Apparent kinetics of the catalyzed water–gas shift reaction in synthetic wood gas

Cited by 8 publications

References 11 publications

Projeto de um reator de deslocamento gás-água com troca térmica integrada e uso de calor residual

Projeto de um reator de deslocamento gás-água com troca térmica integrada e uso de calor residual

Dynamic Modeling and Optimization of a Fixed-Bed Reactor for the Partial Water–Gas Shift Reaction

The implications of choice between sour and sweet shift on process design and operation of an IGCC power plant integrated with a dual-stage selexol unit

Contact Info

Product

Resources

About