Energy Saving and Emission Reduction Estimations of Electrified Railways in China
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1 ADVANCES IN CLIMATE CHANGE RESEARCH 2(4): , DOI: /SP.J ARTICLE Energy Saving and Emission Reduction Estimations of Electrified Railways in China Jicheng He 1, Yuqing Xu 2 1 Division of Environment and Resources Research, Transport Planning and Research Institute, Ministry of Transport, Beijing , China 2 National Climate Center, China Meteorological Administration, Beijing , China Abstract Based on the annual production data collected by the Statistic Center of the Ministry of Railways of the People s Republic of China, we calculated the energy saving and direct emission reductions of CO 2, soot, SO 2, CO, NO x and C nh m of electrified railways, and analyzed their dynamic characteristics during the period of The results show that during this period, the annual mean values of energy saving is tce, and direct emission reduction of CO 2, soot, SO 2, CO, NO x and C nh m are t, t, t, t, t, and t per year, respectively. The annual average increasing rates of energy saving is tce, and direct emission reduction of CO 2, soot, SO 2, CO, NO x and C nh m are t, t, t, t, t and t per year, respectively. The electrified railways have played an important role in decreasing the energy consumption and air pollutant emissions of China s railway system. The results of this study could provide some reference knowledge for future reductions of energy consumption and waste gas emission in China s railway transportation. Keywords: China railways; electrified railways; energy saving; emission reduction; CO 2; air pollutants Citation: He, J., and Y. Xu, 2011: Energy saving and emission reduction estimations of electrified railways in China. Adv. Clim. Change Res., 2(4), doi: /sp.j Introduction Global change and environmental protection are important current challenge for human beings. Plenty of energy consumptions and greenhouse gases and air pollutants emissions have attracted more and more attention, causing energy saving and emission reductions to become hot topics at present [Ding et al., 2010; Fang et al., 2009; Ding et al., 2009]. Energy saving and emission reduction are meant to improve energyuse efficiency, decrease energy consumption, and reduce the emissions of greenhouse gases as well as air pollutants of waste gas, waste water and other waste matters. Before the opening of the United Nations Climate Change Conference 2009 in Copenhagen, the Chinese government clearly put forward the target of controlling CO 2 emission: by 2020, CO 2 emission per unit of GDP should drop by 40% 45% from 2005 levels. This target has been brought into the mid-long term plans for national economic and social development as a binding index. Presently, the studies on energy saving and emission reduction mainly focus on solving the problem of greenhouse gas emission [Zhuang, 2008; He et al., 2009], and on corresponding policy suggestions in China [Wei et al., 2007; Zhuang, 2006; Chen, 2006]. The contents were some qualitative descriptions and calling for policy, lacking of a quantitative analysis Received: 24 March 2011 Corresponding author: Jicheng He, jichenghe@gmail.com 1
2 212 ADVANCES IN CLIMATE CHANGE RESEARCH aimed at a certain industry. The railway is an important transportation method, and is located at a core position in the traffic and transportation industry in China. In electrified railway, the trains are hauled by electric locomotives. They are characterized as high speed, low energy consumption and strong transport capacity. On August 15, 1961, the first electrified railway in China was built between Baoji and Fengzhou [Cai, 1998], and from then on, electrified railway construction has been developed continuously. In recent years, as the construction of passenger dedicated railways, the scale of electrified railway will be broader, the energy consumption of railway transportation will be less, and the effects of energy saving and emission reduction will be more apparent. Some studies have predicted power demand for electrified railways [Ren et al., 2009], while there are few reports of energy consumption, energy saving and emission reduction in China. Here, we quantitatively analyzed the efficiencies of energy saving and emission reduction in electrified railways in terms of a temporal scale, based on the variations in such indices as traction task and annual use of electricity of electronic locomotives in the 33 years from 1975 to 2007 in China. This will provide useful information for construction and development of electrified railways in the future. 2 Data and methods In this study, data of all the indices of diesel locomotives and electric locomotives, the traction task, and so on, are extracted from the China Railways Compendium of Statistic and Concise Railway Statistics [CRSC, 2009]. 2.1 Calculation of energy saving This study analyzed the amount of energy saved by electrified railways by using a replacement calculation method. This method is based on the fact that energy can be saved if diesel locomotives are replaced by electric locomotives to complete the same traction task. Diesel locomotives are driven by diesel oil burning equipment and electric locomotives are driven by electricity. In energy statistics, all the energy consumed must be converted to a standard fuel, that is coal equivalent (ce), which is used as the standard fuel due to the feature of coal-dominated energy structure in China. At present, the statistical standard of energy consumption has only a stipulation on equivalent and equal thermal values of electric power and their conversion standard coal coefficients [SGAPRCQSIQ and SAPRC, 2008]. The amounts of energy saving in electrified railways refer to the saved end-use energy amounts. Based on the international feasible method to calculate end-use energy consumption, the equivalent coefficient, but not the equal coefficient, is used as the conversion standard coal coefficient of electric power. The formula to calculate the annual amount of energy saving from electrified railways is as follows. ( Qi K ) i E i = D i (1) E i is the energy saving of electrified locomotives in the year i (10 6 tce), Q i is the annual traction task in the year i (10 9 t km), K i is per unit of oil consumption of diesel locomotives in the year i (kg (10 3 t km) 1 ). The oil consumption persistently decreased from 440 kg (10 3 t km) 1 in 1975 to 246 kg (10 3 t km) 1 in D i is per unit of electricity consumption of electric locomotives in the year i (10 9 kw h). The annual electricity consumption consistently increased from kw h in 1975 to kw h in In the national criterion General Principles for Calculation of the Comprehensive Energy Consumption, is the reference coefficient for converting diesel oil to standard coal, and is the reference coefficient for converting electricity to standard coal equivalent [SGAPRCQSIQ and SAPRC, 2008]. 2.2 Calculation of emission reduction Railway electrification can change a distributed and mobile emission source (diesel locomotives) into a concentrated and immobile emission source (coalfired power plants). For the railway industry, this can reduce direct emissions from railway transportation. For the whole country, this can lead to the increase of emissions from electricity generation industry. However, pollutant emissions from coal-fired power plants are easier to be controlled as compared with a mo-
3 Jicheng He et al. / Energy Saving and Emission Reduction Estimations of Electrified 213 bile emission source. In this study, we will discuss the problems in direct emissions of railway locomotives from the point of view of industry. Because electric locomotives can not directly emit greenhouse gases and air pollutants by themselves when using electric power, the replacement method is used to calculate the emission reduction from electric locomotives. That is, the amounts of emission reductions are the amounts of direct emissions of CO 2 and air pollutants (such as soot, SO 2, CO, NO x, C n H m ) from diesel locomotives when electric locomotives are replaced by diesel locomotives to take up the same traction task. The formula to calculate annual direct emission of CO 2, soot, SO 2, CO, NO x and C n H m from diesel locomotives is as follows. P ij P ij = Q i K i W j 10 3 (2) is the amount of direct emission of substance j for the combustion of diesel oil by diesel locomotives in the year i (10 6 tce). Q i and K i are the same as that in Eq. (1). W j is the emission coefficient of substance j. The CO 2 emission coefficient of diesel locomotives is 3.16 [Wang, 2009]. With regard to the emission coefficients of air pollutants, only NO x emission values of some combustion equipment and vehicles are tested in China. The testing data is scattered and is not dramatically representative and systematic. Therefore, when compiling national emission inventories for NO x and SO 2, some researchers used the foreign countries emission coefficients of the mid- 1970s [Kato et al., 1992; Tian et al., 2001; Wang et al., 1996]. The emission coefficients of such air pollutants as soot, CO and C n H m for different industries were not reported yet in China. Hence, here we used the emission coefficients obtained from the test in railway industry in China to calculate direct emissions of air pollutants from diesel locomotives. The emission coefficients of CO, NO x, and SO 2 were obtained from the average test values of , , and for three types of diesel locomotives. These experiments were conducted by Cai et al. [1996]. The emission coefficients of soot and C n H m from diesel locomotives were and , respectively, which were the experimental data obtained by the Ministry of Railways of the People s Republic of China [MRPRC, 1988]. 3 Development of electrified railways and their effects of energy saving and emission reduction in China 3.1 Development process of electrified railways Electric locomotives are important equipments in electrified railways. Before 1985, electric locomotives were rare in China, while after 1985, the numbers of electric locomotives increased rapidly. The numbers of electric locomotives increased at a mean rate of 181 per year during There were 5,993 electric locomotives in 2007, which was 31 times of that in 1975 (Fig. 1a). Length of electrified railways in operation (Fig. 1b), increased from 669 km in 1975 to 24,047 km in 2007 at an average rate of 731 km per year. With the increases in the number of electric locomotives and length of electrified railways in operation, the traction task of electric locomotives became more arduous. It increased from t km to t km during the period of , with the average increasing rate of t km per year (Fig. 1c). Figure 1 The development of electrified railways in China during
4 214 ADVANCES IN CLIMATE CHANGE RESEARCH 3.2 Energy saving of electrified railways The numbers and traction tasks of electric locomotives persistently increased during , which led to a rapid increase in energy saving at an average rate of tce per year, and the mean energy saving per year was tce during (Fig. 2a). The amounts of energy saving were less than tce per year before 1980, more than 10 6 tce in 1993, more than tce in 2001, and more than tce in The amounts of energy saving increased slightly in average by tce per year during , increased sharply at an average rate of tce per year during , and increased the most severely at an average rate of tce per year during In general, the amount of energy saving was tce in 2007, which was 74 times of that in Our previous study [He and Li, 2010] has analyzed the changes in energy consumption of China s railway locomotives for the period of Here we calculated the ratio of energy saved by electrified railways to the total energy consumed by railway locomotives (Fig. 2b). The percentage has been continuously rising year by year during The value was low (less than 5%) before 1989, but it exceeded 10% in Afterwards, the percentage increased rapidly. For example, it was more than 20% in 1999, was more than 30% in 2002, and increased to 44% in It implies that, if there was no effect of energy Figure 2 Annual amount of (a) energy saved by electrified railways, and (b) its ratio during saving from electrified railways, the total amount of energy consumption from China s railway locomotives would be tce in Emission reduction of electrified railways Amounts of CO 2 emission reduction CO 2 is the most important greenhouse gas, and abatement of anthropogenic CO 2 emission is crucial to mitigate global warming. As an energy consuming industry, the traffic and transportation industry is also facing a challenge to reduce CO 2 emission. During , more and more electric locomotives were put into service to replace diesel locomotives. The reduction of direct CO 2 emissions increased year by year in China s railway transportation industry, and the effect of greenhouse gas emission reduction was remarkable (Fig. 3a). The reduction of direct CO 2 emission was less than t before 1985, more than t in 1989, more than t in 1993, more than t in 2003, and more than t in The average value of direct CO 2 emission reduction was t during The annual rate of direct CO 2 emission reduction increased by 18.2% during , by 14.0% during , and by 11.8% during The reduction in direct CO 2 emission increased in average by t per year from 1975 to The foresaid amount was t in 2007, which was 86 times of that in Therefore, electrified railways have contributed appreciably to mitigating the direct emission of greenhouse gas in China s railway industry Reduction amount of air pollutants Air pollutants such as soot, SO 2, CO, NO x and C n H m are emitted directly by the combustion of diesel oil in diesel locomotives. Reductions of these air pollutants play an important role in improving air quality along railways. Due to the rapid development of electrified railways, the amount of direct emission of air pollutants declined year by year from 1975 to 2007 in China s railway transportation industry, during this period, annual average amounts of direct emission reduction of soot, SO 2, CO, NO x, and C n H m were , , , , and t, respectively (Fig. 3). The foresaid values increase by
5 Jicheng He et al. / Energy Saving and Emission Reduction Estimations of Electrified 215 emissions in railway locomotives during Annual direct CO 2 emission decreased by 61% from t in 1975 to t in However, direct CO 2 emission would have decreased by 33% with a value of t in 1975, if there was no effect of emission reduction of electrified railways. Especially during the period of , electrified railways contributed the most to CO 2 emission reduction in China. Actually, annual direct CO 2 emission was only t during this period. However, it would be t if there was no contribution of direct emission reduction from electrified railways in China (Fig. 4). As for the percentage of the annual direct CO 2 emission reduction to the actual emission, it was the lowest before Afterward, it increased rapidly. It exceeded 20% in 1997, 40% in 2000, and 60% in According to the China s Mid-Long Term Railway Network Plan, passenger dedicated railways of km will be built before With the construction and operation of passenger dedicated railways, effects of direct emissions reduction from railway transportation will be more significant in the future in China. Figure 3 Annual (a) CO 2 and (b f) air pollutants emission reductions of the electrified railways in China during , 54, 180, 1,250, and 130 t, respectively during ; by 1,650, 239, 770, 5,460, and 560 t, respectively during ; and by 5,060, 732, 2,360, 16,740, and 1,700 t, respectively during The amounts of direct emission reduction of soot, SO 2, CO, NO x, and C n H m in 2007 were 83.6, 83.7, 87.8, 85.8, and 84.0 times of that in 1975, respectively. Annual increased amounts of direct emission reduction of soot, SO 2, CO, NO x, and C n H m were , , , , and t, respectively during Therefore, the development of electrified railways has also contributed greatly to decreasing the direct emission of air pollutants for China s railway industry. 4 Discussion He et al. [2010] calculated annual direct CO 2 Figure 4 Annual actual CO 2 emission and emission reduction of China s railways Before mid-1980s, steam locomotives conducted the main traction tasks (accounting for more than half of the total traction tasks) in railway transportation in China. However, the retirement rate of steam locomotives was also high. Less than 30% of locomotives in 1990 were by steam, and steam locomotives were almost taken out of service before While steam locomotives were being removed from service, the number of diesel and electric locomotives increased gradually. The number of diesel locomotives peaked in 1999,
6 216 ADVANCES IN CLIMATE CHANGE RESEARCH when diesel locomotives accounted for 68.3% of the total traction tasks, and electric locomotives accounted for 30.4%. Since 1999, fewer and fewer diesel locomotives were in operation, while the number of electric locomotives has been rising consistently. There were approximately equal numbers of diesel and electrified locomotives in Hence, the time since 1999 can be considered as a period that diesel locomotives has being replaced by electric locomotives. Whereas, a few electric locomotives were also put into service to replace steam locomotives before Compared with diesel locomotives, steam locomotives had lower energy use efficiency and higher emissions of air pollutants [Tong, 2008]. As a result, the values would be higher if we calculate the amounts of energy saving and emission reduction by replacing steam locomotives with electric locomotives. Therefore, our study presents a conservative estimation. Electrification rate is defined as the percentage of the length of electrified railways in operation to the total length of all the railways. The electrification rate of China s railways increased gradually during It was less than 5% in the early 1980s, more than 10% in the late 1980s and more than 20% in the late 1990s, and increased to 37.8% in There was a close correlation between the electrification rate of China s railways and the amounts of energy saving and emission reduction (Fig. 5). According to the China s Mid-Long Term Railway Network Plan, the electrification rate of China s railways will be more than 60% in 2020 [Li, 2009]. At that time, the amount of energy saving of China s electrified railways will be tce, and the amount of direct emission reduction of CO 2, soot, SO 2, CO, NO x, and C n H m will be , , , , , and t, respectively. Figure 5 The correlations of the electrification rate of China s railways with (a) energy saved, and (b) CO 2 emission reduction (linear equations for the other 5 air pollutants are similar to those for CO 2 except for different coefficients) 5 Conclusions During , electrified railways saved an energy equivalent of tce for China s railway transportation industry. The amount of energy saving increased in average by tce per year from 1975 to Therefore, the effect of energy saving realized by railway electrification is remarkable. Electrified railway also increased annual emission reduction of CO 2 and air pollutants for China s railway transportation industry. During the period of , annual average amounts of direct emission reduction of CO 2, soot, SO 2, CO, NO x, and C n H m were , , , , , and t, respectively. The amounts of direct emission reduction increased in average by , , , , , and t each year, respectively. Therefore, it can be conclude that electrified railways have made a great contribution to reducing the direct emissions of greenhouse gases and air pollutants for China s railway industry. Acknowledgements The study was supported by Climate Change Special Project of China Meteorological Administration (No.
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