Papers by Keyword: SCR

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Authors: Zhi Juan Gao, Wei Ren Bao, Li Ping Chang, Jian Cheng Wang
Abstract: A Cu-SAPO-34/cordierite monolithic catalyst was prepared by in-situ hydrothermal method. The effects of ultrasonic treatment were mainly investigated during the preparing process. The removal of NOX was evaluated using a fixed-bed reactor. X-ray diffraction, scanning electron microscopy were used to characterize the samples showing that the crystallinity of Cu-SAPO-34 molecular sieve have increased after ultrasonic treatment. The Cu-SAPO-34/cordierite prepared by ultrasonic treatment showed higher de-NOx activity and stronger anti-aging property. NOx conversion could reach more than 80% between 440 and 560°C over the fresh Cu-SAPO-34/cordierite catalyst with ultrasonic treatment (600 W, 2 h) and the highest conversion was 86%, however, the highest conversion was only 76% over the Cu-SAPO-34/cordierite catalyst without ultrasonic treatment. After aging (treated for 15 h at 720 °C in the presence of 200 ppm SO2 and 10% vapor), NOx conversion reached more than 45% between 400 and 520 °C over the catalyst with ultrasonic treatment and the highest conversion was 57%, however, the highest conversion was only 43% over the catalyst without ultrasonic treatment. The XRD and SEM results indicated that the structure and morphology of Cu-SAPO-34/cordierite monolithic catalyst kept in good condition after aging.
Authors: Guo Shun Zhou, Tu Ya, Shen Hua, Shu Kun Zhao
Abstract: This paper introduces a novel design of three-phase AC-voltage regulation trigger circuitry using silicon controlled rectifier (SCR), and presents its application in an energy-saving design of oil extractor control system. The design employs photoelectric isolation technique and the inter-phase of three-phase power supply itself, only three groups of triggering signals are required to control the six thyristors conducting angles. The generation of high-precision triggering signals and PID control regulator functions are realized by programming the multiple high-performance timers and the AD interface of a STM32 microprocessor. Experiments and in-field tests have shown the feasibility of the proposed scheme.
Authors: Yu Fei Teng, Li Jie Ding, Fan Tang, Hua Zhang
Abstract: In this paper, a supplementary index, Equal Area Stability Margin (EASM), is proposed to evaluate the system strength for ac-dc interconnected system at sending end. This index can reflect the dynamic characteristic of the interconnected system. Therefore, EASM can be an effective supplement to SCR to evaluate the system strength for ac-dc interconnected system at sending end. Moreover, the solution method of EASM is also analyzed in this paper. Case study indicates the validity of this index.
Authors: Qiu Qi Ding, Min Tao, Yun Xiang Jia
Abstract: Aiming at the problem of electromagnetic interference in design and application of electronic rectifier and inverter system, introduces the electromagnetic interference and electromagnetic compatibility characteristics of common circuit, the interference test of rectifier and inverter system, puts forward the products it has produced inhibition method of interference. The test results show that the method can reduce electromagnetic interference system greatly.
Authors: Jia Zhou, Xiao Long Tan, Wen Bin Wang
Abstract: Inverter technology as the key part of using new energy technology, can be very effective to new energy sources such as solar, battery and fuel cell energy conversion of ac electrical energy transform into ac power, and can be connected to the grid. Therefore, the inverter technology has an extremely important statue in modern society.
Authors: Qian Wang, Ping Qi, Xiao Jing Han, Ming Xing Zhou
Abstract: In this paper, the Urea-SCR system is first introduced; then change of the urea solution concentration under different temperatures with time lapsing is given. Meanwhile, conditions for the urea crystallization are analyzed and SCR converter adaptability is tested under high sulfur environment on engine test bench. As the efficiency of NOx conversion is not significantly reduced after aging and the activity of the catalyst is very little damaged by dense sulfur content in fuel, SCR catalyst is able to adapt to the application of high-sulfur-contained fuel environment in our country.
Authors: Qi Zhen Liu, Yan Jing Sun, Fang Wan
Abstract: Power plants that emit great amounts of nitrogen oxides are the key total mass control part of the “Twelfth Five-Year Plan”. SCR is widely used because the technology is mature and the denitrification efficiency is high. According to the problems of the application of SCR, this paper puts forward relevant suggestions: 1) Combine different flue gas denitrification technologies to raise the denitrification efficiency. 2) Urea is recommended as the reductant considering the safety factors. 3) Issue relevant policies and strictly control the emission of sulfur trioxide.
Authors: Min A Bae, Hong Dae Kim, Kwang Ho Kim, Man Sig Lee
Abstract: Aluminum dross is forms at the surface of the molten metal as the latter reacts with the furnace atmosphere and it was an unavoidable by-product of the aluminum production process. However, it has not been sufficiently recycled yet. Approximately 95% of the Al dross was land filled without innocent treatment. Therefore, Al-dross is positively necessary to recycling. The purpose of this study is to investigate the compressive strength of Selective Catalyst Reduction (SCR) prepares using recycled Al-dross and compared commercial SCR catalyst. Recycled Al-dross was as support material to increase strength. As to experimental procedures, Al dross was classified according to its size. The recycled Al dross was made into SCR catalyst by mixing with WO3, V2O5, and TiO2. After V2O5-WO3-TiO2-Al2O3 SCR strength was measured by Universal Testing Machine (UTM). And then NOx removal activity of V2O5-WO3-TiO2-Al2O3 SCR and commercial SCR catalyst were observed by MR(Micro-Reactor).
Authors: Jie Liu, Xin Yong Li, Qi Dong Zhao, Dong Ke Zhang
Abstract: CuO/TiO2, CuO/Ti0.9Ce0.1O2 and CuO/CeO2/TiO2 composite catalysts were prepared and tested for their application in selective catalytic reduction (SCR) of NO with C3H6. The effect of CeO2 species on the catalytic performance was further evaluated. Catalyst characterization including BET surface area, XRD and temperature-programmed reduction of H2 (H2-TPR) suggested that the addition of CeO2 species changed the physicochemical properties of the catalysts obtained. Compared to the impregnation method, the homogeneous precipitation method was an effective approach to preparing the CeO2 doped catalyst, which could promote the activation of C3H6 to react with NO.
Authors: Dong Zhu Ma, Jian Li, Ling Zhang, Peng Guo, Zi Qiang Wen, Li Jiang Guo
Abstract: Mg-Mo-V-Ti catalysts of low temperature denitrification were prepared by dipping method. In order to study the activity of selective catalytic reduction, the catalyst was placed in a fixed bed reactor. Industrial flue gas was simulated with cylinder gas. Results indicate that the 0.1wt% content of MgO catalyst has good performance on denitration activity and sulfur resistance. The effects of oxygen content, space velocity and reaction temperature on the activity of the 0.1MgO-6MoO3-3V2O5-TiO2 wt% catalyst were investigated. With the increase of oxygen concentration, the denitrification efficiency increases when the oxygen concentration is less than 8%. When the oxygen content is greater than 8%, the denitrification efficiency is almost the same. The denitrification efficiency decreases with the increase of space velocity. The removal efficiency of NO 0.1MgO-6MoO3-3V2O5-TiO2 wt% catalyst over increases first and then becomes stable with the increase of temperature, and the conversion efficiency of SO2 is less than or equal to 2.2% at 120~240 °C.
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