Evaluation of Coal Supply and Demand Security in China and Associated Obstacle Factors
Abstract
:1. Introduction
2. Literature Review
3. Method
3.1. Index System Construction
3.1.1. Study Overview
3.1.2. Selection of criteria
3.2. Study Methods
3.2.1. Data Processing
3.2.2. Entropy Weighting
3.2.3. Comprehensive Evaluation Index Using TOPSIS
3.2.4. Obstacle Degree Model
3.2.5. Grey Prediction Model
4. Results and Discussion
4.1. Weight Calculation Results
4.2. Analysis of the Comprehensive Evaluation Results
4.3. Obstacle Factor Analysis
5. Conclusions and Suggestions
5.1. Conclusions
- (1)
- The comprehensive evaluation results based on entropy–TOPSIS show that the level of China’s coal supply and use during the period 2002–2019 was generally below the safety level, i.e., it was at the safe warning level during the period 2010–2014 and the critical safety level in the other years. The change in China’s coal supply and demand security level initially decreased until 2011 before increasing after that year. Using the GM(1,1) model, this study predicted the security for 2020 and 2021. The results show that the security level and use of the coal supply in China will continue to rise; however, there is still room to improve this security.
- (2)
- Barrier factors affecting China’s coal supply and use safety during the period 2002–2019 were calculated and identified, and the evaluation index with the top seven obstacle degrees in each year were selected as the main obstacle factors. The results show that the basic coal reserves (A1), the reserve–production ratio of basic reserves (A2), the balance of social coal stocks at the beginning and the end of the year (A7), the ratio of coal imports to consumption (B2), the urbanization rate (C3), carbon dioxide emissions (D1), and coal consumption for thermal power generation (D2) were the main obstacles affecting the security of the coal supply and demand in China. Other important criteria were the total wholesale profit for coal and related products (A5), railway transportation volume (A6), coal supply and demand ratio (B4), GDP (C1), the proportion of non-coal energy consumption (C5), and the proportion of total power generation hours that come from coal (D3).
- (3)
- Based on the obstacle degree of each criterion, the obstacle degree for the four subsystems were calculated and the grey model was utilized to predict their obstacle degree for 2020 and 2021. The results showed that, of the four evaluation subsystems, the obstacle degree of the coal supply chain was higher than that of the other three subsystems; over the study period, it decreased initially before increasing. The obstacle degree for the social ecological subsystem has increased in recent years, whereas that of the economy/demographics subsystem has decreased recently. The coal market subsystem had the lowest obstacle degree overall, which has decreased in recent years.
5.2. Limitations and Prospects
5.3. Policy Advice
- Plan the layout of coal production and improve the quality of the coal supply: It is important to optimize the layout of coal production and development, to comprehensively consider the national coal resource endowment conditions, regional economic development characteristics, coal market consumption demand, coal transportation channel capacity, ecological environment carrying capacity and other factors, and to promote the intensive development of coal resources. Furthermore, measures should be undertaken to improve the concentration of coal production and promote coal production in the five major coal production and supply bases of Shanxi, Shaanxi, western Inner Mongolia, eastern Inner Mongolia, and Xinjiang with good resource endowment conditions. Other recommendations include controlling the total amount of coal production, optimizing coal stockpiles, developing an advanced and high-quality production capacity, eliminating backward production capacity, promoting the transformation and upgrade of the industrial structure, improving the quality of coal production and supply, and reducing the conflict between coal production capacity and market supply and demand [59,60,61].
- Improve the coal reserve system and strengthen the emergency coal supply: Coal reserve capacity building determines the length of the coal security interval, and as reserve capacity increases, the length of the coal security interval shortens, and coal consumption tends to develop steadily [62]. According to the time–space fluctuation law of coal demand and the distribution of existing reserves, we recommend that the spatial layout of the coal reserve bases be scientifically optimized, and the effective connection between coal reserves and the construction of coal production, supply, storage, and sales infrastructure should be strengthened [63]. Additionally, it is important to rationally plan and design the site selection of reserve projects so that they have significant strategic locational advantages, such as being adjacent to major transportation channels, and a strong trans-regional transfer capacity throughout the country to realize a stable, secure, and continuous supply of coal to core areas, important cities, key industries, and power enterprises. It is also important to enhance the coal supply security against trans-regional, systematic, and comprehensive risks.
- Diversify the sources of imports and enhance international coal acquisition: China should establish cooperative partnerships with major coal exporting countries, expand the breadth and depth of its international coal trade and industry cooperation, promote the diversification of its coal import sources, enhance its international coal resource acquisition capacity, and improve the national coal supply. Furthermore, it should strengthen cooperation with Russia, Mongolia, Indonesia, and other countries with rich coal resource reserves, establish overseas coal production and supply bases by means of cooperative exploration and development, invest in overseas acquisitions, increase the production and supply of imported coal, and enhance the supply security of imported coal through direct channels [64]. Finally, it is important to build a national market-oriented procurement platform for imported coal and conduct centralized procurement of high-quality international resources to effectively supplement the supply channels of domestic coastal resources, promote the optimization of imported coal types and quality, and stabilize the domestic coal market.
- Promote green development, clean and efficient utilization of coal, and energy conservation and carbon reduction: We recommend that the following measures should be undertaken: improving the level of green coal mining, washing, and processing; improving the efficiency of coal logistics and transportation; optimizing the structure and mode of coal utilization; and promoting the whole industrial chain and life cycle of coal mining, processing, transportation, and utilization to achieve clean and low carbon emissions [60,65]. Other recommendations include integrating superior resources, increasing the investment in scientific research, promoting the use of carbon capture, usage, and storage (CCUS) technologies and conducting a pilot demonstration, speeding up the implementation of key technologies, developing complete sets of equipment for the clean and efficient utilization of coal (e.g., efficient coal-fired power generation, new generation coal-to-oil, modern coal chemical industry, and intelligent energy technology), and promoting energy conservation and emissions reduction in major coal consuming industries [66].
- Optimize the power supply structure and promote smooth power reform: The power industry is still the dominant industry in China in terms of coal consumption, and thermal power generation is currently the primary power generation method [67], so the restructuring of the power supply is imperative. For this purpose, it is necessary to accelerate the transformation, upgrade, elimination, and/or renewal of units that are subcritical and below, promote the upgrade of ultra-supercritical coal-fired generating units to new coal-fired generating units with a higher efficiency (e.g., high and low reheat units and 700 °C ultra-supercritical units), and promote the continuous reduction of coal consumption for thermal power generation [68]. Furthermore, it is important to vigorously promote technological innovation, transformation, and upgrades in the coal–electricity+ field and solid waste-coupled power generation. Taking advantage of a power generation system consisting of active large-capacity coal-fired generating units would promote the transformation and upgrade of fuel preparation, boiler combustion, and environmental protection treatment systems and equipment and promote the research and development, pilot application, and promotion of coal-fired coupled power generation technologies that utilize coal-fired biomass such as agricultural and forestry waste, domestic garbage, and municipal sludge to improve the power generation efficiency of biomass; promote solid-waste consumption, recycling, energy conservation, and carbon reduction; and synergistically improve the overall energy efficiency of the energy system [62].
- Strengthen the overall control of coal consumption and its growth. For this purpose, it is important to rationally balance the competition and cooperation relationship between coal and other fossil-based and clean energies and promote the coupled development of coal and other energy sources. Furthermore, we recommend optimizing the energy consumption structure of major coal terminal consumption industries, promoting coal reduction and coal restrictions in major coal terminal consumption industries such as steel, building materials, chemicals, and cement, promoting clean energy substitutes for coal such as electricity or gas, and increasing the energy consumption of new and renewable energies. Other measures include improving the supporting policies and management mechanisms for total coal consumption control, including fiscal and taxation financial support, differentiated control, coal unit consumption management, coal-savings index trading, differentiated electricity prices, and strengthening statistics [69].
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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---|---|---|---|---|
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---|---|---|---|---|---|---|---|---|---|---|
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This study | Comprehensive evaluation index for coal supply and demand security | National and industrial | Coal supply and demand security | Coal supply chain, coal market factors, economic and demographic factors, social ecological factors | 2002–2019 | 19 | Entropy–TOPSIS | √ | √ | √ |
Target | Subsystem | Index Layer | Criteria | Unit | Code | Attribute |
---|---|---|---|---|---|---|
Coal supply security | Coal supply chain (A) | Coal resource endowment | Basic coal reserves | 10,000 tons | A1 | Positive |
Remaining exploitable life | Basic reserve–production ratio | Year | A2 | Positive | ||
Coal production and supply | Raw coal output | 10,000 tons | A3 | Positive | ||
Production safety situation | Million-ton mortality rate | % | A4 | Negative | ||
Capital profitability | Total profit of coal wholesale products | CNY 100 million | A5 | Positive | ||
Coal transportation capacity | Coal transportation shipment volume (cumulative completion) | 10,000 tons | A6 | Positive | ||
Coal stock | Social stock balance | 10,000 tons | A7 | Positive | ||
Coal market (B) | Coal price change | Average annual coal price | USD | B1 | Negative | |
External dependence of coal | Coal import dependence on foreign countries | % | B2 | Negative | ||
Coal consumption | Coal consumption intensity | % | B3 | Negative | ||
Coal supply and demand relationship | Coal supply–demand ratio | % | B4 | Positive | ||
Coal demand security | Economy and demographics (C) | Economic growth | Gross domestic product (GDP) | CNY 100 million | C1 | Negative |
Population growth | Natural population growth rate | % | C2 | Negative | ||
Urbanization level | Urbanization rate | % | C3 | Negative | ||
Industrial structure | Contribution rate of secondary industry to GDP | % | C4 | Negative | ||
Energy structure | Proportion of non-coal consumption in energy consumption | % | C5 | Positive | ||
Social ecology (D) | Ecological environment | Carbon dioxide emissions | Megaton | D1 | Negative | |
Coal consumption | Coal consumption during thermal power generation | 10,000 tons | D2 | Negative | ||
Power supply structure | Proportion of coal power generation hours in the total power generation hours | % | D3 | Negative |
Security Level | Unsafe/Insecure | Warning | Generally Secure | Relatively Secure | Secure |
---|---|---|---|---|---|
Relative closeness range | [0, 0.2) | [0.2, 0.4) | [0.4, 0.6) | [0.6, 0.8) | [0.8, 1] |
Model Accuracy Level | Value Range for Posterior Error Ratio C |
---|---|
Grade Ⅰ (good) | C ≤ 0.35 |
Grade II (qualified) | 0.35 < C ≤ 0.50 |
Grade III (barely qualified) | 0.50 < C ≤ 0.65 |
Grade IV (unqualified) | 0.65 < C |
Subsystem | Reference Number | Criteria | Hierarchical Weight | Weight |
---|---|---|---|---|
A. Coal supply chain (0.3368) | A1 | Basic coal reserves | 0.1375 | 0.0463 |
A2 | Basic reserve–production ratio | 0.3028 | 0.1020 | |
A3 | Raw coal output | 0.0885 | 0.0298 | |
A4 | Million-ton mortality rate | 0.0675 | 0.0227 | |
A5 | Total profit of wholesale coal products | 0.1376 | 0.0463 | |
A6 | Coal transportation shipment volume (cumulative completion) | 0.1428 | 0.0481 | |
A7 | Balance of the social inventory of coal at the beginning of the year | 0.1233 | 0.0415 | |
B. Coal market (0.2072) | B1 | Average annual coal price | 0.1725 | 0.0357 |
B2 | Proportion of coal imports | 0.3409 | 0.0706 | |
B3 | Coal consumption intensity | 0.2582 | 0.0535 | |
B4 | Coal supply–demand ratio | 0.2285 | 0.0473 | |
C. Economy and demographics (0.2479) | C1 | Gross domestic product (GDP) | 0.1417 | 0.0351 |
C2 | Natural population growth rate | 0.1210 | 0.0300 | |
C3 | Urbanization rate | 0.1944 | 0.0482 | |
C4 | Contribution rate of secondary industry to GDP | 0.1966 | 0.0487 | |
C5 | Proportion of non-coal energy consumption consumption | 0.3461 | 0.0858 | |
D. Social ecology (0.2081) | D1 | Carbon dioxide emissions | 0.3861 | 0.0803 |
D2 | Coal consumption for thermal power generation | 0.2880 | 0.0599 | |
D3 | Proportion of coal power generation hours to total power generation hours | 0.3259 | 0.0678 |
Year | S+ | S− | Security Score | Ranking | Security Level |
---|---|---|---|---|---|
2002 | 0.1404 | 0.1825 | 0.5652 | 1 | Generally secure [0.4, 0.6] |
2003 | 0.1522 | 0.1635 | 0.5179 | 2 | |
2004 | 0.1417 | 0.1506 | 0.5153 | 3 | |
2005 | 0.1571 | 0.1361 | 0.4642 | 6 | |
2006 | 0.1573 | 0.1274 | 0.4474 | 8 | |
2007 | 0.1643 | 0.1160 | 0.4139 | 12 | |
2008 | 0.1532 | 0.1213 | 0.4418 | 10 | |
2009 | 0.1603 | 0.1122 | 0.4117 | 13 | |
2015 | 0.1606 | 0.1202 | 0.4282 | 11 | |
2016 | 0.1634 | 0.1295 | 0.4421 | 9 | |
2017 | 0.1666 | 0.1350 | 0.4475 | 7 | |
2018 | 0.1694 | 0.1470 | 0.4647 | 5 | |
2019 | 0.1751 | 0.1558 | 0.4709 | 4 | |
2010 | 0.1657 | 0.1071 | 0.3926 | 14 | Warning [0.2, 0.4] |
2011 | 0.1898 | 0.0953 | 0.3343 | 18 | |
2012 | 0.1863 | 0.1012 | 0.3519 | 17 | |
2013 | 0.1866 | 0.1026 | 0.3549 | 16 | |
2014 | 0.1774 | 0.1066 | 0.3754 | 15 |
Year | Obstacles | Ranking | ||||||
---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | ||
2002 | Factor | B4 | A5 | A7 | A6 | C2 | C5 | D3 |
Degree | 17.1513 | 13.8813 | 11.8326 | 10.5356 | 10.0048 | 9.9214 | 7.7003 | |
2003 | Factor | B4 | A5 | C5 | A7 | A6 | C4 | D3 |
Degree | 13.6083 | 11.9292 | 9.8863 | 9.7280 | 8.7207 | 8.1028 | 7.6628 | |
2004 | Factor | A2 | A5 | C5 | A7 | A6 | B4 | C2 |
Degree | 10.6749 | 10.1543 | 9.8065 | 9.3999 | 8.0487 | 7.8016 | 6.9608 | |
2005 | Factor | A2 | B4 | C5 | A5 | D1 | A6 | D3 |
Degree | 12.1533 | 11.5068 | 9.8922 | 8.3545 | 8.0930 | 6.5284 | 6.3635 | |
2006 | Factor | A2 | D1 | C5 | A5 | B4 | A7 | D3 |
Degree | 13.4762 | 9.8018 | 9.5326 | 8.2265 | 7.2504 | 7.0723 | 6.6146 | |
2007 | Factor | A2 | D1 | B4 | A7 | C5 | D2 | A5 |
Degree | 13.6310 | 10.3969 | 8.6782 | 8.6023 | 8.4942 | 6.8780 | 6.4435 | |
2008 | Factor | A2 | D1 | A7 | C5 | B4 | D2 | B1 |
Degree | 14.7922 | 11.0519 | 9.4525 | 8.0894 | 7.8963 | 7.5695 | 6.8230 | |
2009 | Factor | A2 | D1 | A7 | D2 | C5 | B2 | C3 |
Degree | 15.5679 | 11.5988 | 9.9619 | 8.1915 | 7.8097 | 7.3990 | 5.6555 | |
2010 | Factor | A2 | D1 | B2 | D2 | A1 | A1 | B1 |
Degree | 16.5943 | 11.6609 | 8.5155 | 8.3695 | 7.7384 | 7.6131 | 6.3271 | |
2011 | Factor | A2 | A1 | D1 | D2 | B2 | C3 | A7 |
Degree | 15.9628 | 12.9148 | 10.9245 | 8.5050 | 7.5880 | 6.7183 | 6.4460 | |
2012 | Factor | A2 | A1 | D1 | B2 | D2 | C3 | A7 |
Degree | 15.8548 | 11.4121 | 11.3081 | 9.5000 | 9.1336 | 7.4324 | 6.2976 | |
2013 | Factor | A2 | D1 | A1 | B2 | D2 | C3 | A7 |
Degree | 15.7508 | 11.8392 | 10.7308 | 10.5392 | 10.0576 | 8.0542 | 6.5237 | |
2014 | Factor | A2 | D1 | A1 | D2 | B2 | C3 | A7 |
Degree | 15.5621 | 12.0292 | 10.4156 | 9.6808 | 9.6234 | 8.7091 | 6.4721 | |
2015 | Factor | A2 | D1 | A1 | C3 | D2 | B2 | C1 |
Degree | 16.8843 | 13.2811 | 11.0521 | 10.4569 | 9.8325 | 7.4407 | 7.1916 | |
2016 | Factor | A2 | D1 | C3 | D2 | D2 | B2 | C1 |
Degree | 15.6538 | 13.0100 | 10.9977 | 10.2223 | 9.9020 | 9.6751 | 7.7606 | |
2017 | Factor | A2 | D1 | C3 | D2 | B2 | A1 | C1 |
Degree | 15.2790 | 12.9525 | 11.2624 | 10.4704 | 9.8577 | 9.7421 | 8.4928 | |
2018 | Factor | A2 | D1 | C3 | D2 | B2 | C1 | A1 |
Degree | 15.6491 | 13.6107 | 12.2392 | 11.6074 | 10.3057 | 9.6991 | 8.9257 | |
2019 | Factor | A2 | D1 | C3 | D2 | B2 | C1 | A7 |
Degree | 15.3641 | 13.7258 | 12.4505 | 11.8101 | 10.6781 | 10.3252 | 8.4902 |
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Zhang, X.; Ning, Y.; Lu, C. Evaluation of Coal Supply and Demand Security in China and Associated Obstacle Factors. Sustainability 2022, 14, 10605. https://doi.org/10.3390/su141710605
Zhang X, Ning Y, Lu C. Evaluation of Coal Supply and Demand Security in China and Associated Obstacle Factors. Sustainability. 2022; 14(17):10605. https://doi.org/10.3390/su141710605
Chicago/Turabian StyleZhang, Xintong, Yuncai Ning, and Cuijie Lu. 2022. "Evaluation of Coal Supply and Demand Security in China and Associated Obstacle Factors" Sustainability 14, no. 17: 10605. https://doi.org/10.3390/su141710605
APA StyleZhang, X., Ning, Y., & Lu, C. (2022). Evaluation of Coal Supply and Demand Security in China and Associated Obstacle Factors. Sustainability, 14(17), 10605. https://doi.org/10.3390/su141710605