Comparison of single step and two-step of dimethyl ether production with energy and exergy analysis

Name: Teeranun Nakyai

LCSH: Burapha University.Faculty of Engineering

LCSH: Biomass gasification

LCSH: Exergy

Abstract: The main purpose of this thesis is to assess both two-step and single-step processes of DME productions via air-steam biomass gasification through energy and exergy analyses, exergoeconomic analysis, and CO2 emission intensity. For the hydrogen production, Methane co-feeding can improve the energy and exergy efficiency. The economic reveal that the air-steam biomass gasification with methane co-feeding also presented the lowest unit hydrogen cost of 2.69 $/kg. In the syngas production part, the air-steam coal gasification showed the lowest unit syngas cost of 0.65 $/kg for the two-step process, while biomass gasification with air-steam agents presents the lowest unit cost of syngas of 0.54 $/kg for the single-step process. In addition, the utilization of oxygen-steam as agent has more energetic and exergetic efficiencies than that of air-steam because of more energy intensive. In the comparison of the single-step and two-step of DME synthesis, the results were found that the single-step process has higher DME yield than the two-step because of lower thermodynamic limitation. The single-step process achieves the highest energetic and exergetic efficiencies of 35.79% and 26.82%, respectively. Furthermore, the singlestep-process has lower unit cost than the two-step process of about 38.34% of DME unit cost and reduces the CO2 emission about 23.94% of total CO2 emission. For the comparison of a gas cleaning units (Rectisol and MDEA) in a single-step of DME productions, the Rectisol based-process has slightly greater energetic and exergetic efficiencies than the MDEA based-process. Additionally, the DME production integrated Rectisol unit, with the DME unit cost of 1.92 $/kg, has more cost effectiveness than the MDEA unit.

Burapha University. Library

Address: CHONBURI

Email: buulibrary@buu.ac.th

Name: Dang Saebea

Role: Principal advisor

Created: 2019

Modified: 2021-02-22

Issued: 2021-02-22

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Th 621.042 Te258C

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Chemical and Environmental Engineering

Grantor: Burapha University

©copyrights Burapha University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	57810194.pdf	7.53 MB

ใช้เวลา

0.031724 วินาที