scholarly journals Manipulation of product distributions via reverse flow operation with side feeding

2018 ◽  
Vol 6 (1) ◽  
pp. 542
Author(s):  
Yogi W Budhi
Keyword(s):  
Steady State ◽  
Ammonia Oxidation ◽  
Flow Reactor ◽  
Reverse Flow ◽  
Temporal Patterns ◽  
Quasi Steady State ◽  
State Dynamic ◽  
Product Distributions ◽  
Nh3 Oxidation ◽  
Reverse Flow Reactor

A new concept of a reverse flow reactor with side feeding is studied for NH3 oxidation to produce N2, NO, and N2O. In the conventional reverse flow operation, where the feeds are alternately introduced from either end of the reactor, the conversion always decreases when compared to steady state, once­ through operation. The new concept of reverse flow operation with sidefeeding is therefore proposed to avoid the drop of conversion. The reactor behavior is simulated for three regimes (quasi-steady state, dynamic, sliding) with varying feed positions. The development of spatia-temporal patterns inside the reactor with side feeding shows completely different behavior compared to conventional reverse flow, leading to the possibility of conversion and selectivity manipulations.Keywords: Ammonia oxidation, Conversion and selectivity improvement, Reverse flow reactor, Side feedingAbstrakSuatu konsep baru dari reaktor aliran balik dengan pengumpanan samping telah dipelajari dengan kasus oksidasi NH3 untuk menghasilkan N2, NO, dan N2O. . Pada operasi aliran balik konvensional dimana umpan secara bergantian dimasukkan dari ujung reaktor, konversi yang dihasilkan selalu menunjukkan penurunan ketika dibandingkan dengan keadaan tunaknya dalam satu tahap operasi. Konsep baru aliran balik dengan pengumpanan samping dimaksudkan untuk menghindari penurunan konversi. Perilaku reaktor disimulasi dalam 3 rejim aliran (quasi-steady state, dynamic, sliding) dengan memvariasikan posisi umpan. Pembentukkan pola spatia-temporal di dalam reaktor dengan pengumpanan samping menunjukkan perilaku yang berbeda dibanding aliran balik konvensional. Hal ini memungkinkan untuk memanipulasi konversi dan selektivitas.Kata Kunci: Oksidasi Ammoniak, Pengumpanan  Samping, Peningkatan Konversi dan Selektivitas, Reaktor aliran bolak-balik

scholarly journals A Singular Perturbation Problem for Steady State Conversion of Methane Oxidation in a Reverse Flow Reactor

2012 ◽  
Vol 44 (3) ◽  
pp. 275-284 ◽  
Author(s):  
Aang Nuryaman ◽  
◽  
Agus Yodi Gunawan ◽  
Kuntjoro Adji Sidarto ◽  
Yogi Wibisono Budhi
Keyword(s):  
Steady State ◽  
Singular Perturbation ◽  
Methane Oxidation ◽  
Flow Reactor ◽  
Reverse Flow ◽  
Singular Perturbation Problem ◽  
Perturbation Problem ◽  
Conversion Of Methane ◽  
Reverse Flow Reactor

scholarly journals TOWARDS KINETIC REGIME OF REVERSE FLOW OPERATION

2018 ◽  
Vol 4 (3) ◽  
pp. 322
Author(s):  
Yogi Budhi
Keyword(s):  
Steady State ◽  
Flow Reactor ◽  
Switching Time ◽  
Reverse Flow ◽  
Fixed Bed ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Kinetic Regime ◽  
Steady State Operation ◽  
Reverse Flow Reactor

An analysis of reverse flow operation and its experimental study for ammonia oxidation to produce either N2, N2O, and NO have been carried out. An experimental set-up of reverse flow reactor was constructed for a laboratory scale. The experiment under steady state operation was performed as a base case in order to judge the potential during the reverse flow operation. Aim was to investigate the behavior of reverse flow operation and to observe the reactor performance. Focus was on the comparison of the steady state and reverse flow operations. The experiments show that the behavior of reverse flow reactor is strongly influenced by the ratio of the switching time over the residence time. The ammonia conversion during the regular reverse flow operation shows lower values compared to the steady state operation which is even worse during asymmetric mode. The product distributions may change under flow reversal, depending on the operating conditions, regime of operation, and operation mode.Keywords : Reverse Flow Operation, Fixed Bed Reactor, Selectivity Manipulation, Steady State Operation, Ammonia OxidationAbstrak Sebuah analisis operasi aliran bolak-balik dan studi eksperimental oksidasi amoniak untuk menghasilkan baik N2., N2O, dan NO telah dilakukan. Sebuah perangkat eksperimen reaktor aliran bolak-balik dikonstruksi untuk skala laboratorium. Eksperimen dalam operasi keadaan tunak dilakukan sebagai kasus dasar untuk menilai potensi operasi aliran bolak-balik. Tujuan penelitian ini adalah untuk meneliti kelakuan operasi aliran bolak-balik dan untuk mengamati kinerja reaktor. Kajian ini dititikberatkan pada perbandingan operasi keadaan tunak dan operasi aliran bolak-balik. Hasil percobaan menunjukkan bahwa kelakuan reaktor aliran bolak-balik sangat dipengaruhi oleh nisbah waktu pembalikan arah aliran (switching time) terhadap waktu tinggal. Konversi amomiak dalam operasi aliran bolak-balik menunjukkan nilai yang lebih rendah dibandingkan dengan operasi keadaan tunak dan dalam mode asimetrik konversinya bahkan lebih rendah lagi. Distribusi produk dapat berubah dalam pembalikan aliran yang bergantung pada kondisi-kondisi operasi, daerah operasi, dan mode operasi.Kata Kunci : Operasi Aliran Bolak-balik, Reaktor Fixed Bed, Manipulasi Selektivitas, Operasi Tunak, Oksidasi Amoniak

scholarly journals Characteristics of flow reversal in the kinetic regime

2018 ◽  
Vol 5 (3) ◽  
pp. 490
Author(s):  
Yogi W Budhi
Keyword(s):  
Residence Time ◽  
Surface Coverage ◽  
Ammonia Oxidation ◽  
Flow Reactor ◽  
Catalyst Surface ◽  
Reverse Flow ◽  
Oxidation Kinetic ◽  
Flow Reversal ◽  
Kinetic Regime ◽  
Reverse Flow Reactor

In principle, reactor perturbation by flow reversal can be used for manipulation of catalyst surface coverage if a dedicated and proper operation procedure can be developed. A mathematical model and analysis of reverse flow reactor behaviour for the ammonia oxidation over platinum have been performed. Series of reverse flow experiments were carried out on a laboratory reactor scale. The influence of flow reversals on the conversion and selectivity at various switching times was observed and evaluated. Other process variables such as gas residence time, reaction temperature, and oxygen concentration in the feed were points of interest. Assessment of reactor dynamics in the kinetic regimes can be achieved most expediently by implementing a comparable switching time and gas residence time. Model and experimental results indicate that regular reverse flow operation for manipulation of catalyst surface coverage always induces a decrease of conversion. It was also found that the selectivity due to flow reversal was rather insensitive to changes in the switching frequency.Keywords: Ammonia oxidation, Kinetic regime, Reactor modeling, Residence time distribution, Reverse flow reactor operation, Transient operation AbstrakPada dasarnya pertubasi reaktor oleh aliran balik dapat digunakan untuk mengatasi penutupan permukaan katalis manakala suatu suatu prosedur operasi yang spesifik dan sesuai bisa dibangun. Analisa dan model matematika kelakuan reaktor batik untuk oksidasi amoniak pada pelat platina telah dilakukan. Serangkaian percobaan aliran balik telah dilangsungkan dalam skala laboratorium. Pengaruh aliran batik terhadap konversi dan selektivitas pada berbagaijumlah putaran aliran telah diamati dan dievaluasi. Variabel proses lainnya, seperti waktu tinggal gas, temperature reaksi, dan konsentrasi oksigen pada umpan telah menjadi perhatian pada penelitian ini. Perkiraan dinamika reaktor dalam rejim kinetika umumnya dapat diperoleh melalui penelusuran implementasi jumlah putaran aliran dan waktu tinggal gas dengan perbandingan tertentu. Hasil percobaan dan pemodelan mengindikasikan bahwa operasi aliran batik reguler untuk memanipulasi penutupan permukaan katalis selalu mengakibatkan penurunan konversi. Selain itu, ditemukan juga bahwa selectivitas terhadap pembalikan aliran kurang sensitif terhadap perubahan pada frekuensi putaran aliran.Keywords: Distribusi waktu tinggal, Operasi reaktor aliran batik, Operasi transient, Oksidasi amoniak, Pemodelan reaktor, Rejim kinetika

Hybrid modeling and dynamics of a controlled reverse flow reactor

AIChE Journal ◽  
2007 ◽  
Vol 53 (8) ◽  
pp. 2084-2096 ◽  
Author(s):  
Erasmo Mancusi ◽  
Lucia Russo ◽  
Antonio Brasiello ◽  
Silvestro Crescitelli ◽  
Mario di Bernardo
Keyword(s):  
Flow Reactor ◽  
Reverse Flow ◽  
Hybrid Modeling ◽  
Reverse Flow Reactor
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