Techno-economic and environmental analysis of coal-based synthetic natural gas process in China

Yang, Liu; Qian, Yu; Xiao, Honghua; Yang, Siyu

doi:10.1016/j.jclepro.2017.08.011

Cited by 33 publications

(4 citation statements)

References 21 publications

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“…The development of CCI in China results from the special energy reserve structure, namely, abundant coal resource and relatively scarce oil and natural gas reserves. However, as compared to transforming oil [37] 7.00 and natural gas to chemicals, transforming coal to chemicals has much higher CO 2 emission factors due to chemical process characteristics. Transforming coal to oil or natural gas also leads to higher CO 2 emission as compared to directly exploiting oil or natural gas.…”

Section: High Co 2 Emission Price Of CCI On Account Of China's Energy...mentioning

confidence: 99%

Intensive carbon dioxide emission of coal chemical industry in China

et al. 2019

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Section: High Co 2 Emission Price Of CCI On Account Of China's Energy...mentioning

confidence: 99%

Intensive carbon dioxide emission of coal chemical industry in China

et al. 2019

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“…According to the requirement of synthesis gas reaction, it is necessary to use water-gas shift technology to increase that ratio to 3.1 for methanation. However, as the Equation (1) of water-gas shift reaction shows, CO 2 emission is inevitably increased in that process [7,8].…”

Section: Co + H O(vapor) = Co + H ∆H = 4119 Kj/molmentioning

confidence: 99%

Modeling and Analysis of Coal-Based Lurgi Gasification for LNG and Methanol Coproduction Process

Yang

Kokossis

2019

Processes

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A coal-based coproduction process of liquefied natural gas (LNG) and methanol (CTLNG-M) is developed and key units are simulated in this paper. The goal is to find improvements of the low-earning coal to synthesis natural gas (CTSNG) process using the same raw material but producing a low-margin, single synthesis natural gas (SNG) product. In the CTLNG-M process, there are two innovative aspects. Firstly, the process can co-generate high value-added products of LNG and methanol, in which CH4 is separated from the syngas to obtain liquefied natural gas (LNG) through a cryogenic separation unit, while the remaining lean-methane syngas is then used for methanol synthesis. Secondly, CO2 separated from the acid gas removal unit is partially reused for methanol synthesis reaction, which consequently increases the carbon element utilization efficiency and reduces the CO2 emission. In this paper, the process is designed with the output products of 642,000 tons/a LNG and 1,367,800 tons/a methanol. The simulation results show that the CTLNG-M process can obtain a carbon utilization efficiency of 39.6%, bringing about a reduction of CO2 emission by 130,000 tons/a compared to the CTSNG process. However, the energy consumption of the new process is increased by 9.3% after detailed analysis of energy consumption. The results indicate that although electricity consumption is higher than that of the conventional CTSNG process, the new CTLNG-M process is still economically feasible. In terms of the economic benefits, the investment is remarkably decreased by 17.8% and an increase in internal rate of return (IRR) by 6% is also achieved, contrasting to the standalone CTSNG process. It is; therefore, considered as a feasible scheme for the efficient utilization of coal by Lurgi gasification technology and production planning for existing CTSNG plants.

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“…However, the principal issue of current coal chemical projects is the resultant tremendous CO 2 emission as shown in Figure 2A. [2][3][4][5][6] Carbon emission of coal-based chemical industries mainly includes indirect CO 2 emission from heat/ electricity supply and direct CO 2 emission from the coal chemical conversion process, e.g., water-gas shift reaction. [7][8][9] Notably, carbon emission of coal to carbide or coking process is 80% lower than for other processes since they only involve indirect carbon emission from the heat/electricity supply.…”

Section: Context and Scalementioning

confidence: 99%

Hybrid Energy System for a Coal-Based Chemical Industry

Chen

et al. 2018

Joule

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Coal, with the highest carbon content, is the main raw material to produce human carbon necessities via coal gasification to chemicals technology. However, huge CO 2 emission from the water-gas shift unit included in the coalbased chemicals process to increase the H/C ratio of syngas has caused great concern. Thus, a hybrid energy system that integrates renewable hydrogen from nuclear/renewable energy with coal to produce fuel and chemicals has been proposed. The applicability of hybrid energy systems in coal-rich countries, especially China and the United States, is analyzed as well as the carbon emission reduction potential and economic feasibility. The hybrid energy system is feasible in most coal-intensive countries and will lead to significant carbon emission reduction potential in the coming 5-15 years. Moreover, with the sharp decline in power cost from renewable/nuclear energy and the carbon tax introduction, the hybrid system shows potential to become economically competitive.

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Techno-economic and environmental analysis of coal-based synthetic natural gas process in China

Cited by 33 publications

References 21 publications

Intensive carbon dioxide emission of coal chemical industry in China

Intensive carbon dioxide emission of coal chemical industry in China

Modeling and Analysis of Coal-Based Lurgi Gasification for LNG and Methanol Coproduction Process

Hybrid Energy System for a Coal-Based Chemical Industry

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