DEStech Transactions on Environment, Energy and Earth Science最新文献

{"title":"Technological Preparation to the Manufacturing of Thick-Walled Polymer Composite Products","authors":"O. Dmitriev, A. A. Barsukov, A. Dmitriev","doi":"10.12783/dteees/peems2019/33962","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/33962","url":null,"abstract":"The paper explores the technological problems that occur in the manufacturing of thick-walled polymer composite products. A detailed causal analysis of technological problems was carried out. We found the most vulnerable stages of the technology and outlined the ways to resolve them based on the method of mathematical modeling and optimization. The method allows to calculate the temperature-conversion fields during the curing of polymer composites and to choose the right optimization strategy of technological process molding.","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88398580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and Model Analysis of the Development Trend of Renewable Energy in China","authors":"Hao Wu, Lingwei Zheng","doi":"10.12783/dteees/peems2019/33920","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/33920","url":null,"abstract":"At present, the clean and low-carbon energy has become the development trend of all countries. Especially in China, the coal based energy structure not only guarantees the social and economic development of the country, but also causes serious ecological damage, so the energy transformation is imminent. The development of renewable energy is an important choice for energy transformation. This paper uses mathematical model to calculate the overall development trend of China's energy, and then uses diamond model to analyze the macro environment for renewable energy industry, to clarify the basis and challenges for renewable energy industry, so as to provide reference for the formulation of macro policies and industrial. Introduction Diamond model through four factors of industry, namely production factors, demand conditions, supporting industries and peer competition, in addition, there are opportunities and government two factors for comprehensive analysis. Using diamond model to analyze renewable energy industry is to analyze the production capacity, market demand, competition with traditional energy and advantages and disadvantages of policy. The diamond model is shown in Figure 1. Figure 1. Diamond model. Overall Situation of China's Energy Development Overall Situation of Energy Structure In 2018, China's primary energy consumption totaled 4.64 billion standard coal (tce) with electric power accounting for 25.5% of the terminal energy consumption [1] . Non fossil energy accounts for Enterprise strategy, structure and horizontal competition Related and supporting industries production factors Demand conditions Opportuni ty","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82377610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on the Performance of Perovskite Solar Cells Based on All-oxide Charge Transport Layers","authors":"Xiao Zonghu, W. Zhong, H. Ou, Haiyan Fu, Shunjian Xu, Yongping Luo, Chen Liu","doi":"10.12783/dteees/peems2019/34023","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/34023","url":null,"abstract":"A perovskite solar cell with NiO and ZnO as charge transport layers was successfully fabricated. Intramolecular exchange technology was used to improve the morphology of CH3NH3PbI3 thin films. Doping was used to improve the conductivity of the NiO layer. X-ray diffractometer and scanning electron microscopy were used to analyze CH3NH3PbI3 thin films. A solar simulator with a digital source meter and quantum efficiency measurement system were used to test devices performance. The perovskite solar cells with FTO/p-NiO/CH3NH3PbI3/n-ZnO/Ag structure, have optimal PCE of 11.02% and long-term stability at 25 °C and 30 ± 2% humidity. This provides the possibility for the application of perovskite solar cells in the atmospheric environment. Introduction Various countries in the world have stepped up their efforts to develop new energy sources, duing to issues such as the energy crisis and environmental pollution. Recently, a new type of solar cell using an organic-inorganic hybrid halide perovskite as a light absorber has attracted the attention of many scientific researchers, which has the advantages of excellent performance, simple structure, and low preparation cost. The photoelectric conversion Efficiency has increased rapidly from 3.8% [1] to over 25.2% [2] in the past 10 years. The hole-transport materials currently used in such perovskite solar cells are usually organic polymers, such as Spiro-OMeTAD, PTAA [3], P3HT [4], PCBM [5], DEH [6], etc. Among them, spiro ometad device has the best performance, but the price is more expensive, 10 times of gold, which greatly improves the device cost, and the long-term stability of organic materials also needs to be further tested. Therefore, the development of high-efficiency and low-cost inorganic materials has become one of the important research directions of this kind of new solar cells. NiO is a p-type transparent oxide semiconductor with a wide band gap (Eg of 3.6 ~ 4.0 eV) and excellent performance. It has been successfully used as a hole-collecting and electron-blocking layer in dye-sensitized solar cells and organic solar cells. Compared with organic hole materials, NiO-based devices show better stability and comparable conversion efficiency [7]. Compared with TiO2, ZnO has a close band structure and higher electron mobility, which is 100 times that of TiO2 [8]. This enables photo-generated electrons to be more effectively injected into their conduction bands, and to transmit quickly to reduce electron losses and increase photocurrent. In addition, ZnO materials have the advantages of simple preparation, diverse morphology, and high crystal quality. These properties make ZnO the most ideal substitute for TiO2. In this work, NiO was used to replace the expensive and poorly stable Spiro-OMeTAD as the hole transport layer, and ZnO was used to replace TiO2 with low electron mobility as the electron transport layer. A perovskite solar cell with p-NiO/CH3NH3PbI3/n-ZnO simple sandwich structures were cons","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83328897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CFD Simulation of Symbiotic Disaster Arising from Gas Explosion and Spontaneous Combustion in Longwall Mining Gobs","authors":"Zhen Xing","doi":"10.12783/dteees/peems2019/33940","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/33940","url":null,"abstract":"With the increasing of mining depth, the symbiotic disaster of gas and coal spontaneous combustion is gradually increasing. In order to explore the multi-field coupling law of gas and coal spontaneous combustion in the goaf, the numerical simulation method was used to optimize the key parameters and find the best balance between effectively controlling the gas without expanding the danger zone of spontaneous combustion. The results show that, the higher the level of the high-level drainage roadway, the better the drainage effect, but considering the spontaneous combustion period, it is necessary to reasonably calculate the optimal drainage roadway layout position; the buried pipe extraction has good effect on gas control, but it is not conducive to fire prevention.","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79235732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fault Analysis of Transmission Equipment Based on Condition Monitoring","authors":"Ma Qingshan, Sun Yuwei, Deng Weichao, Yu Xinchun, Zhu Jianbao, Zhongyi Wang","doi":"10.12783/dteees/peems2019/34022","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/34022","url":null,"abstract":"This paper proposes a method for evaluating the operating status and reliability of power transmission equipment in power systems. First, by analyzing the aging factors, common faults, and major faulty components of the main transmission equipment, the main condition monitoring parameters of each transmission equipment are determined. Then, the key parameters such as the environment, machinery, and electricity of the transmission equipment are monitored to obtain the operating status data of the transmission equipment, and fault limits and alarm limits are set to determine the operating status of the transmission equipment. Finally, a health index for monitoring parameters and a comprehensive health index for transmission equipment are proposed. This method has a wider scope of application and a more specific analysis process than previous methods, which is conducive to analyzing the working status of power transmission equipment and improving the reliability and safety of normal operation of the power system. Introduction The operating status of power equipment is closely related to the safety and reliability of the power system. Failure of power equipment will cause local or large-scale power outages and result the entire power system in an unsafe operating state. Therefore, it is necessary to adopt reasonable maintenance strategies for power equipment, timely discover and solve problems in the operation of power equipment, and ensure that the system can supply power safely and reliably. The accuracy and reliability of the judgment method of fault diagnosis will directly affect the normal operation and maintenance of power transmission equipment, and even affect the safety and reliable operation of the entire power system. With the application of a large number of sensing technologies and intelligent terminal equipment, a fault diagnosis method for power transmission equipment based on condition monitoring is one of the effective means to improve the efficiency of equipment condition maintenance and improve the ability of fault discrimination. This paper proposes a method for measuring fault conditions of power transmission equipment based on condition monitoring data. This method determines the status of the power transmission equipment by analyzing the common fault types of the power transmission equipment. Based on the study of the environmental, electrical, and mechanical condition monitoring parameters of the transmission equipment, the corresponding relationship between the monitoring parameters and the fault is established. This paper is organized as follows. The second II analyzes the transmission equipment, and analyzes the main aging factors and fault types of the transmission equipment. The section III introduces the process of condition monitoring of transmission equipment and the transmission equipment condition monitoring technology and the main monitoring parameters of transmission equipment. The section IV takes the SF6 circuit ","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74752293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on Drinking Water Sources Environment Protection Funds","authors":"Jun Gao, Ling-ling Song","doi":"10.12783/dteees/peems2019/33950","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/33950","url":null,"abstract":"Drinking water sources protection was related to human health. However, outstanding problems existed in effectively raising the funds needed to protect the drinking water sources. This paper aimed at summarizing the relevant experience and practices of drinking water source protection funds at home and abroad, proposing the preliminary conception of constructing government-led application of drinking water source environmental protection fund in China. The construction ideas were put forward from the aspects of source of funds, use of funds, and management methods of funds. Introduction Environmental protection of drinking water sources was an important part of ensuring the safety of drinking water and human health. At present, the sources of funds for China's drinking water source protection projects mainly include relevant national special funds, provincial financial funds and local financial funds. The amount of the money was not stable and the money was conditioned by multiple factors. It was difficult to form a stable protection mechanism for drinking water sources. Exploring the establishment of drinking water source funds was an effective way to establish diversified investment channels, and promoting effective supply of drinking water source protection funds. Research Background and Significance The use of funds at home and abroad had achieved remarkable results. It had been confirmed that government input alone was unable to solve complex environmental problems. It was especially important to stimulate the enthusiasm of enterprises and society for environmental protection. The United States had successful experience in using market-based mechanisms to solve water environmental problems.The Clean Water State Revolving Fund built in 1987 played a larger capital amplification role. It attracted corporate and social capital into the field of environmental protection. Druing the past thirty years, it Provided more than $89 billion in financing for the United States. In addition, the US Drinking Water State Revolving Fund had also played an important role in guiding social capital investment in the protection of drinking water sources. China's SME credit guarantee fund, which was established in Suzhou, Jiangsu and other places, had accumulated successful experience in breaking through the bottleneck of SME financing. Research and promoting establishment of drinking water source environmental protection funds was important to absorb social capital and supplementary financial input. On the one hand, establishing a reasonable income mechanism to absorb the social capital. on the other hand, the fund could be used to support the drinking water sources protection engineering. The mode adopted coudle be free subsidy or Interest-free or low-interest loan. The fund could also encourage social capital to implement projects in PPP mode. Domestic and Foreign Drinking Water Source Protection Fund Research Stable Source Channels Ensure Continuous Injection","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80157595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Wind Power Configuration in Distribution Network Based on Scenario Clustering and Power Flow Entropy","authors":"Mingze Zhang, Yicheng Huang, Min Wang","doi":"10.12783/dteees/peems2019/34015","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/34015","url":null,"abstract":"When the wind power is connected to the distribution network, the access points and the access capacity of each point in the distribution network will also affect the stability of the distribution network. Therefore, based on the fuzzy C clustering of wind speed, this paper optimizes the location and capacity of wind power in the distribution network by using the proposed entropy index of power flow which reflects the power flow equilibrium degree of the system. Firstly, typical wind speed and output scenarios are selected through scenario clustering, and then the flow entropy index reflecting system stability is adopted to optimize the location and capacity of wind power. The improved IEEE33 was used to verify the method. Introduction With the development of energy technology, it is imperative to connect renewable energy such as wind power to distribution network. However, due to the inherent uncertainty of wind power, it is bound to affect the stability of distribution network. Therefore, how to plan the access location of wind power in distribution network and the access capacity of wind power in each access location is very important [1,2]. Since the randomness of wind power output is strong, the randomness of wind power generation needs to be analyzed before planning and optimization. A probability distribution can be used to describe the randomness of variables comprehensively. Since the randomness of different meteorological variables is not the same, they must correspond to different theoretical distribution models. The results show that the wind speed probability distribution curve can be fitted by a statistical model. Common fitting models include Rayleigh model, log-normal distribution model, Gamma distribution model and two-parameter Weibull distribution model [3]. However, in the process of calculating the probability distribution function, parameter estimation is difficult. At the same time, the accuracy of the probability function is difficult to guarantee because of too many uncertain factors. Scenario analysis can exactly solve the above problems. The scenario set describes the probability of the possible occurrence of uncertain events in the future. Since the probability measure of random events can be observed, the scenario set can comprehensively reflect the occurrence of full probability scenarios [4,5]. Too many scenarios will result in too much computation. Therefore, the scene needs to be clustered. Fuzzy C Mean (FCM) is a classification based Fuzzy clustering method. By describing the membership of samples to different categories, this algorithm can objectively cluster, which can overcome the defects of traditional clustering algorithm of either/or, and occupies an important position in Fuzzy clustering [6]. Since the access of wind power will inevitably affect the power flow distribution of the system, the power flow distribution of the system also affects the stability of the system. Therefore, this paper proposes to us","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80162880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of Multi-effect Evaporator for Sewage Treatment","authors":"Aoni Zhang, Jin-hui Zhao, Yuxia Bai, Haifen Han, Y. Bu","doi":"10.12783/dteees/peems2019/33923","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/33923","url":null,"abstract":"This paper takes chemical salt water treatment as an example, to describe the desigen process of multi-effect evaporation sewage treatment equipment. Using software to simulate and analyze the influence of different factors on the results. Using line graphs to show the results of operating conditions of Luoyang Sinopec Branch. Introduction Evaporation refers to the process of evaporating and concentrating the solution containing the non-volatile solute and the volatile solvent, mainly by heating to vaporize a part of the solvent in the solution [1]. The multi-effect evaporator uses the secondary steam produced in the evaporation production as the heat source of the next unit. Such as, liter film multi-effect evaporator, falling film multi-effect evaporator [2], steam recompression multi-effect evaporator[3]. Multi-effect Evaporator Design Select Design Software and Reasons Aspen Plus was used to establish a chemical salt water treatment system. (1) The model physical property database is complete and suitable for more complex process simulation. (2) Fast unit simulation is possible. (3) With advanced calculation methods, the model can be optimized. Setting the Composition of Salty Sewage It is difficult to determine accurate data for these substances, such as chemical formula, content, etc. Therefore, in the modeling verification, the sewage composition needs to be simplified. In this design experiment, according to the sewage component in the sewage data of Luoyang Sinopec Branch, it is assumed that the large particle insoluble sludge has been removed. Common electrolytes such as ions and potassium ions are used as impurities, and volatile impurities are not considered at present[4]. Determination of Multi-effect Evaporator Efficiency With the increase in the efficiency of the multi-effect evaporator, the amount of steam required is reduced and the operating cost is reduced with the same total evaporation,the equipment and infrastructure costs will increase[5]. Therefore, the multi-effect evaporation system referred to herein is three-effect evaporator. Design Evaporato The heat exchanger model HeatX in Aspen plus, the separator model flash and the pressure transmission module Valve represent the multi-effect evaporator. Design Condenser In multi-effect evaporation, using the HeatX model in the Aspen plus module library instead. The final multi-effect evaporator system is: Figure 1. Multi-effect Evaporation System. Determine the Convergence Method The current simulation convergence method selects the traditional WEGSTEIN method. Module Parameter Setting The system parameters simulated in this paper are as follows: Table 1. Parameters of the Simulated Plate. HeatX Stream flash Valve Calculation shortcut — — Pressure change parameter Hot fluid outlet gas fraction Flow rate temperature Outlet pressure Hot fluid outlet temperature temperature pressure — — ingredient — — — pressure — — According to the above table, the fluid parameters of the evapora","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91024336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Pyrolysis Temperature on ZnCl2 Impregnated Corn Straw-derived Biochar Properties and Vanadium (III, IV, V) Adsorption in Aqueous Solution","authors":"Ruihong Meng, Tan Chen, Yanting Liu, P. Lv, Qingshui Hong, Hanwen Guo, Hongtao Wang","doi":"10.12783/dteees/peems2019/33947","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/33947","url":null,"abstract":"In this study, corn straw derived biochars were prepared at different temperatures of 300, 500, 700C, respectively, and the characteristics of corn straw biochars were investigated. Additionally, the adsorption behaviors of vanadium (III, IV, V) on biochars were systematically studied by batch experiments. The absorbents were characterized by ion-exchange capacity (IEC), X-ray Diffraction, N2 adsorption-desorption, and FTIR. The yield of biochar decreases with the increase of pyrolysis temperature. The more ash content is retained, the more alkaline biochar is. The specific area of biochars increased with the rising pyrolysis temperature. With the increase of temperature, the structure became porous and the content of surface functional group elements remained low. Although the content of zinc in biochar is relatively high, the leaching toxicity of biochar does not exceed the Chinese standard. The adsorption capacity of biochars for vanadium (V) decreased under high temperature (700C). In the contrast, The adsorption capacities of biochars for vanadium (IV) and vanadium (III) improved under high temperature. The adsorption mechanisms for vanadium (V), vanadium (IV) and vanadium (III) were surface complexation, which can be proved by FTIR analysis.","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88886499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on Laser Absorption Spectrum Detection Technology for CO2 and NH3 Regional Emission","authors":"Ying He, Boqiang Fan, Mengqi Li, Zhang Yujun, Kun You, Hao Xie, Dongqi Yu, Boen Lei, Li Xiaoyi, Jian-guo Liu, Wenqing Liu","doi":"10.12783/dteees/peems2019/34004","DOIUrl":"https://doi.org/10.12783/dteees/peems2019/34004","url":null,"abstract":"High-sensitivity emission monitoring of CO2 and NH3 in farmland region is very important for analyzing environment and climate change. The on-line detection technology was studied based on open-path tunable diode laser absorption spectroscopy technology (OP-TDLAS). The detection spectrum of open path was extracted to realize accurate concentration inversion by designing the multi-line fitting algorithm. The system detection stability was evaluated by Allan variance that the detection limit of NH3 and CO2 were about 0.048 L/L and 4.31 L/L respectively. The detection experiment was carried out in farmland of north Anhui to prove that both of the fertilization and straw returning to the field were the emission source of CO2 and NH3 from soil. The growth effect of the former was slower but higher than that of fertilization. This stable spectrum detection method can obtain large-scale concentration results and clear emission rules, which provide technical support for the environment-friendly agriculture. Introduction In recent years, our country has adopted straw returning to the field [1,2] which has changed the physical and chemical properties of the soil in a certain extent and even increased the possibility of CO2 and NH3 emission from the soil. Therefore, CO2 and NH3 emission data in large-scale farmland need obtain by effective and stable detection method to assess its impact on the atmospheric environment, which has become an urgent problem in agriculture and environmental fields [3,4] . Gas monitoring in farmland ecosystem usually adopts box method [5] , micrometeorology method [6-7] and so on. These methods mainly study local soil emissions which are vulnerable to environmental factors, and the requirements to underlying surface and atmospheric stability are high. In recent years, open-path tunable diode laser absorption spectroscopy (OP-TDLAS) technology has been gradually applied for large-scale monitoring. This technology [8,9] continuously measures the gas without sampling and pretreatment. It is more effective to monitor adsorbed gases (such as NH3). Moreover, it has the advantage of fast detection [10] and high sensitivity combined with long optical path technology. Flesch et al. (2007) measured methane volatilization in pasture based on TDLAS technology to verify its measurement accuracy. Todd et al. (2015) carried out ammonia emission monitoring in dairy farmland, and the volatilization rate obtained was 304g·head -1 ·d -1 . Anning Zhu et al. (2012) carried out ammonia emission monitoring before and after nitrogen fertilizer application in Huang-Huai-Hai farmland with TDLAS and BLS technology to obtain the emission rule. At present, there are few reports on effective extraction of characteristic absorption spectrum and improvement of detection stability in open-path detection. In this paper, the multi-line fitting algorithm was designed to realize spectrum detection. Allan variance analysis was carried out to determine the measureme","PeriodicalId":11369,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Science","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78516456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}