Yulius Deddy Hermawan
Program Studi Teknik Kimia, Fakultas Teknologi Industri, UPN ”Veteran” Yogyakarta Jl. SWK 104 (Lingkar Utara), Condong Catur, Yogyakarta 55283

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Dinamika Proses pada Sistem Pemanas Tangki Berpengaduk dengan Arus Bypass Hermawan, Yulius Deddy
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2014: PROSIDING SNTKK 2014
Publisher : Prosiding Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

The liquid concentration and temperature dynamic behavior of a stirred tank heater with bypass stream (STHB) has been studied experimentally. A cylinder tank was designed and arranged for experimentation in laboratory. The tank has two input streams, stream-1 (salt solution with its volumetric rate of f1 [cm3/sec], salt concentration of cg1 [gr/cm3]) and stream-2 (water-stream with its volumetric rate of f2 [cm3/sec]). A part of the stream-1 was bypassed (f3 [cm3/sec]) and mixed with the output stream of the tank (f5 [cm3/sec]). The electric heater was employed for heating liquid in the tank. Since the tank was designed overflow, the liquid volume in tank was always constant. In this work, the mass and thermal disturbance load has been made based on step increase and decrease. Those disturbance included the changes of the bypass volumetric rate (f3), the water volumetric rate (f2), and the electric heat (qe). The dynamic behavior of the STHB has also been explored. As can be seen from our investigation in laboratory, the STHB produced a stable response. Furthermore, the open loop dynamic simulation using computer programing was also done, and its simulation results were compared with the experiment data from laboratory. The developed mathematical model of the STHB has been solved numerically. Scilab software was chosen to examine such mathematical model. This study also revealed that the trends of simulation results were quite similar with those in our experiment results.
Perancangan Konfigurasi Pengendalian Proses dengan RGA pada Sistem Pure-Capacitive-Two-Tank-in-Series dengan Pemanas di Tangki T-01 Hermawan, Yulius Deddy; Kholisoh, Siti Diyar; Permatasari, Indah; Ludwinia, Amy Farury
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Prosiding Seminar Nasional Teknik Kimia "Kejuangan"

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This research was aimed to design process control configuration in the Pure-Capacitive-Two-Tank-in-Series (PCTTS) quantitatively by using Relative Gain Array (RGA) method. Two square tanks were designed and arranged in series for investigation in laboratory. The electric heater was equipped in the tank T-01. Water was used as a fluid which is assumed that its density and heat capacity were constant. The feed water was flowed to tank T-01 and heated with an electric heater. Water of tank T-01 was then pumped to tank T-02. The pump volumetric rate can be adjusted by changing the pump voltage. This research was done through 2 procedures as follows: preliminary experiment and open loop RGA experiment. The preliminary experiment has given the steady state parameters as follows: the input and output volumetric rates of the 2 tanks were 104 cm3/second, liquid levels of tank T-01 and T-02 were 14 cm, liquid temperatures in tank T-01 and T-02 were 33.5oC, electric heat energy was 1520 watt,  and pump voltage was 66.5 volt. Based on degree of freedom analysis, there were 3 variables of PCTSS system need to be controlled (CV); they were liquid temperature in tank T-01 (T1), liquid level in tank T-01 (h1), and liquid level in tank T-02 (h2). In RGA experiment, the manipulated variable candidates (MV) were changed manually based on the step function and its output (CV) responses were also be recorded. RGA calculation has resulted 3 couples of CV-MV as follows: T1-qe, h1-vpu, and h2-f2. Furthermore, study on the tuning of control parameters and closed loop simulation need to be done to examine performance of the resulted control configuration of PCCTS.
Penyetelan Parameter Pengendalian Proses dengan PRC pada Sistem Pure-Capacitive-Two-Tank-in-Series dengan Pemanas di Tangki T-01 Hermawan, Yulius Deddy; Kholisoh, Siti Diyar; Suryani, Lili; Kusuma Putri, Ramantasia Aktariastiwi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Prosiding Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

This researchcontinued the previous work by Hermawan, Y.D. et al., 2016. The goals of this research wereto tune the process control parametersand to do the closed loop dynamic simulationfor the proposed control configuration of Pure-Capacitive-Two-Tank-in-Series (PCTTS) with an electric heater in tank T-01.The proposed control configuration consisted of 3 couples of CV-MV as follows T1-qe, h1-vpu, and h2-f2. The open loop experiment results would be used for tuning of PID control parameters. In this work, the PID control parameters were tuned quantitatively by using Process Reaction Curve (PRC) method. The controllergain (Kc) for temperature control of tank T-01 (TC-01), level control of tank T-01 (LC-01), and level control of tank T-02 (LC-02) has been found as follows: 364.8 watt/oC, -2.3 volt/cm, and -12.9 cm2/second , respectively. The integral time constant (tI) for 3 controllers were as follows: 60 second, 60 second, and 90 second, respectively. The derivative time constant (tD) for 3 controllers were as follows: 15 second, 15 second, and 22.5 second, respectively. Furthermore, the proposed control configuration and resulted tuning parameters were examined through rigorous dynamic simulation by using scilab software. The input volumetric rate disturbance (with amount of ±29%) was made based on step function. The developed of closed loop state equation was solved numerically. Integral of the absolute value of the error (IAE) for TC-01, LC-1 and LC-2 were 73, 1686, and 695, respectively. The dynamic simulation results showed that the proposed control configuration with its tuning parameters gave a stable response to a change in the input volumetric rate. This study also revealed that the PID controller gave fastest responses compared to P and PI controller.
Design of Flow Control System with A Kickback Flow as A Manipulated Variable Hermawan, Yulius Deddy
Eksergi Vol 14, No 2 (2017): Eksergi Volume 14 No 2 2017
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

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Abstract

The open loop experiment of water flow dynamic in pipe has been done in laboratory. Pump was used to flow water in pipe. Part of liquid from discard of pump was recycled back to the suction of pump (kickback) and adjusted to control the liquid flow to the next process. The open loop laboratory experiment produced the steady state parameters; they were discard flowrate =16.6 [L/min], kickback flowrate =5.8 [L/min], and liquid flowrate to the next process =10.8 [L/min]. These steady state parameters were then used as the initial value for closed loop simulation with computer programming. This study has proposed the liquid flow control configuration by manipulating the kickback flow. Proportional Integral (PI) was proposed to control the flow and Routh-Hurwitz (RH) stability criterion was chosen to predict the range of the controller gain (Kc) that gives stable response. The closed loop model was solved analytically with Laplace method for both servo and regulatory problems. The set point change of flow and disturbance were made based on step function. The scilab software was used to do closed loop simulation. Based on RH stability criterion, the controller gain should be negative in order to give stable response. The closed loop simulation showed that by using controller gain Kc=–0.5 and integral time constant tI=0.3 [min], stable and fast response with Integral Absolute Error (IAE) near to zero (0,0022) could be achieved.
Studi Terintegrasi Kelayakan Proses Injeksi Gas CO2 untuk Enhanced Oil Recovery (EOR) di Lapangan Minyak Kristanto, Dedy; Harriyadi, Harriyadi; Hermawan, Yulius Deddy; Yusuf, Yusmardhany
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Prosiding Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

CO2 gas injection is once of recommended Enhanced Oil Recovery (EOR) methods by injecting CO2 through reservoir pore after reached its residual saturation, since CO2 dissolved easily in oil phase due to oil extraction as confirmed by many other researcher in pertaining field study. An integrated system is urgently required for assessing CO2-EOR feasibility study, covering multi disciplinary aspects as follows: geology, geophysics, reservoir, production, process and economic. Hence those systems must be reliable in suggesting final decision for feasibility study of CO2-EOR operation program, applicable either for pilot scale or full scale. This paper will proposing integrated system evaluation, which has following features:  (1) Estimate fraction of dissolved CO2,(2) Estimate viscosity reduction, (3) Estimate future of oil productivity index resulted, (4) Estimate forecast of incremental oil recovery, (6) Estimate surface facilities equipment design, (7) Evaluate economical aspects, and (8) Generate final decision for feasibility of CO2-EOR operation program. Finally, as the main objective of this program, those system will present a picture of essential reason why we need to promote or reject CO2-EOR plan program, also some recommendations will presented in case of CO2-EOR plan does not perform from what it is supposed to be.
DYNAMIC SIMULATION AND COMPOSITION CONTROL IN A 10 L MIXING TANK Hermawan, Yulius Deddy; Haryono, Gogot
Reaktor Volume 14, Nomor 2, Oktober 2012
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.011 KB) | DOI: 10.14710/reaktor.14.2.95-100

Abstract

The open loop experiment of composition dynamic in a 10 L mixing tank has been successfully done inlaboratory. A 10 L tank was designed for mixing of water (as a stream-1) and salt solution (as astream-2 with salt concentration, c2 constant). An electric stirrer was employed to obtain uniformcomposition in tank. In order to keep the liquid volume constant, the system was designed overflow. Inthis work, 2 composition control configurations have been proposed; they are Alternative-1 andAlternative-2. For Alternative-1, the volumetric-rate of stream-1 was chosen as a manipulatedvariable, while the volumetric-rate of stream-2 was chosen as a manipulated variable for Alternative-2. The composition control parameters for both alternatives have been tuned experimentally. Thevolumetric-rate of manipulated variable was changed based on step function. The outlet stream?scomposition response (c3) to a change in the input volumetric-rate has been investigated. Thisexperiment gave Proportional Integral Derivative (PID) control parameters. The gain controllers Kc[cm6/(gr.sec)] for Alternative-1 and Alternative-2 are -34200 and 40459 respectively. Integral timeconstant ( tI) and Derivative time constant (tD) for both alternatives are the same, i.e. tI = 16 second,and tD = 4 second. Furthermore, closed loop dynamic simulation using computer programming wasalso done to evaluate the resulted tuning parameters. The developed mathematical model ofcomposition control system in a mixing tank was solved numerically. Such mathematical model wasrigorously examined in Scilab software environment. The results showed that closed loop responses inPID control were faster than those in P and PI controls.
DESIGN OF LEVEL CONTROL IN A 10 L PURE CAPACITIVE TANK: STABILITY ANALYSIS AND DYNAMIC SIMULATION Hermawan, Yulius Deddy; Reningtyas, Renung; Kholisoh, Siti Diyar; Setyoningrum, Tutik Muji
International Journal of Science and Engineering Vol 10, No 1 (2016)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (546.136 KB) | DOI: 10.12777/ijse.10.1.

Abstract

The open loop experiment of a 10 L pure capacitive tank has been successfully done in laboratory. The square tank connected with a pump was designed for investigation in laboratory, and the water was chosen as a fluid with its input volumetric rate of fi(t) [cm3/min]. The output volumetric rate of fo(t) can be adjusted by changing the pump voltage of vpu(t) [volt]. The open loop experiment has given the steady state parameters, and it could then be used for calculating the dynamic parameters. This study has proposed the level control configuration of a 10 L pure capacitive tank system; liquid level in the tank h(t) was kept constant by manipulating the pump voltage of vpu(t); and the input water volumetric rate of fi(t) was considered as a disturbance. The P-only-control was implemented to control the level. Purposes of this study are to analyze the stability of the closed loop responses and to do the closed loop dynamic simulation. The closed loop mathematical model was solved analytically with Laplace Transform, and Routh-Hurwitz criterion was chosen to analyze the stability. Since the closed loop model was found in the 2nd order system, the response depended on the value of the damping coefficient (?), in which it was really affected by the controller gain (Kc). In order to examine the control configuration, the input water volumetric rate disturbance (with amount of ±14%) was made based on step function. Based on the stability analysis, a stable response would be achieved if the controller gain is negative (Kc<0) and the damping coefficient is positive (?>0). Based on the dynamic simulation, the controller gain was recommended in between -117.36 [volt/cm] and -1.17 [volt/cm] and the damping coefficient in between 0 and 1. This study also revealed that by tuning an appropriate controller gain, the fastest and the stable response would be achieved.
Kajian Coreflooding Test di Laboratorium Menggunakan Injeksi Surfactant-Polymer untuk Meningkatkan Produksi Lapangan Minyak Kristanto, Dedy; Wibowo, Wibowo; Hariyadi, Hariyadi; Hermawan, Yulius Deddy
Eksergi Vol 16, No 1 (2019): Vol.16 No.1 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i1.2938

Abstract

Penggunaan injeksi kimia telah banyak digunakan pada lapangan minyak dalam skala yang besar. Beberapa kasus mengalami keberhasilan yang tinggi dan di sisi lain banyak juga yang mengalami kegagalan pada saat pelaksanaan full-scale project. Sebelum dilakukannya injeksi kimia, salah satu hal yang sebaiknya dilakukan adalah mencoba dan merealisasikan chemical yang layak digunakan berdasarkan karakteristik reservoirnya yang menjadi target untuk peningkatan perolehan minyak. Coreflooding menjadi salah satu hal yang penting dalam penilaian kinerja chemical yang digunakan setelah tahapan screening. Kajian coreflooding di laboratorium menunjukkan bahwa hasil pengukuran sifat surfaktan dan polimer memberikan hasil yang baik untuk digunakan sebagai bahan injeksi dalam meningkatkan perolehan minyak. Injeksi surfactant?polymer dengan konsentrasi 3000 ppm dan 1000 ppm dengan mekanisme injeksi sebanyak 0,3 PV surfaktan dan 0,2 PV polimer menghasilkan peningkatan perolehan minyak sebesar 12,89%. Selanjutnya berdasarkan hasil analisa secara kualitatif didapatkan bahwa penggunaan surfaktan SS-B8020 sebagai fluida injeksi tidak menyebabkan terjadinya penyumbatan pada pori-pori batuan reservoir, yang berarti bahwa fluida injeksi kompatibel dengan batuan reservoir tersebut.