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Shihezi, China

Liu H.,Wuhan University | Liu H.,Tianye Group Co. | Rao J.,Wuhan University
2nd International Workshop on Education Technology and Computer Science, ETCS 2010 | Year: 2010

With the rapid development of the oil industry-level demand for steel , the performance of oil steel pipe has put forward higher requirements. Induction heat treatment of steel pipe can improve performance and save cost, so it has been widely used in the steel pipe manufacturing industry. In order to reduce the number of trial-error procedures in plant which usually are long and costly, numerical simulation has been revealed as an important tool in designing the induction heating system. In this paper, the steel pipe temperature distribution in induction heat treatment is simulated considering the material properties. It is shown that the simulation results of the object temperature in good agreement with the different technology demands, which can provide useful information to optimize the whole induction heating process. © 2010 IEEE.

He H.,Shihezi University | Ma F.,Shihezi University | Yang R.,Shihezi University | Chen L.,Tianye Group Co. | And 5 more authors.
PLoS ONE | Year: 2013

Plastic mulching with drip irrigation is a new water-saving rice cultivation technology, but little is known on its productivity and water-saving capacity. This study aimed to assess the production potential, performance, and water use efficiency (WUE) of rice under plastic mulching with drip irrigation. Field experiments were conducted over 2 years with two rice cultivars under different cultivation systems: conventional flooding (CF), non-flooded irrigation incorporating plastic mulching with furrow irrigation (FIM), non-mulching with furrow irrigation (FIN), and plastic mulching with drip irrigation (DI). Compared with the CF treatment, grain yields were reduced by 31.76-52.19% under the DI treatment, by 57.16-61.02% under the FIM treatment, by 74.40-75.73% under the FIN treatment, which were mainly from source limitation, especially a low dry matter accumulation during post-anthesis, in non-flooded irrigation. WUE was the highest in the DI treatment, being 1.52-2.12 times higher than with the CF treatment, 1.35-1.89 times higher than with the FIM treatment, and 2.37-3.78 times higher than with the FIN treatment. The yield contribution from tillers (YCFTs) was 50.65-62.47% for the CF treatment and 12.07-20.62% for the non-flooded irrigation treatments. These low YCFTs values were attributed to the poor performance in tiller panicles rather than the total tiller number. Under non-flooded irrigation, root length was significantly reduced with more roots distributed in deep soil layers compared with the CF treatment; the DI treatment had more roots in the topsoil layer than the FIM and FIN treatments. The experiment demonstrates that the DI treatment has greater water saving capacity and lower yield and economic benefit gaps than the FIM and FIN treatments compared with the CF treatment, and would therefore be a better water-saving technology in areas of water scarcity. Copyright: © 2013 He et al.

Zhou K.,Tsinghua University | Jia J.,Tsinghua University | Li C.,Tianye Group Co. | Xu H.,Tsinghua University | And 3 more authors.
Green Chemistry | Year: 2015

China has the world's largest polyvinyl chloride (PVC) production capacity, comprising over 20 Mt a-1 and occupying 41% of the world production capacity. However, the production of the PVC monomer, vinyl chloride monomer (VCM), faces unsustainable development due to mercury problems. Over 70% of VCM in mainland China is synthesized through hydrochlorination of C2H2 catalyzed by HgCl2. Mercury and its compounds escaping from the reactors have high chronic toxicity, which is harmful to the environment and to people's health. Therefore, developing a novel mercury-free catalyst is crucial for maintaining a green production of PVC in China. This paper shows a novel low content Au-based catalyst by complexing Au with thiocyanate (-SCN). This chemical complex significantly decreases the electrode potential of Au3+ from 0.926 V to 0.662 V, and hence reduces the probability of its reduction by C2H2. The catalyst preserves a high turnover frequency of 5.9 s-1 based on Au, and over 3000 h testing of a 4 t a-1 pilot-trial shows its promising reactivity (>95%) and selectivity (>99%). Compared with the conventional HgCl2 catalyst, this novel Au catalyst has better reactivity, stability, environmental friendliness and lower toxicity, making it promising for the sustainable development of China's PVC industry. © The Royal Society of Chemistry 2015.

Xu H.,Tsinghua University | Zhou K.,Tsinghua University | Si J.,Tianye Group Co. | Li C.,Tianye Group Co. | Luo G.,Tsinghua University
Catalysis Science and Technology | Year: 2016

The research and development of a non-mercury catalyst for China's PVC (polyvinyl chloride) industry is extremely urgent. Gold (Au) loaded on activated charcoal (AC), as a potential novel catalyst with high activity, has been regarded as an ideal substitute for mercury. However, the deactivation of a gold catalyst caused by acetylene for long-term industrial applications is a big challenge. In this work, a new methodology of ligand screening and design for gold catalysis was constructed. Trichloroisocyanuric acid (TCCA) was proved to be an excellent ligand. Besides, copper (Cu) was added and proved to be a favorable synergistic metal so that the content of Au in the catalyst could be further reduced to 0.2 wt% (weight percentage). Experimentally, the best ratio of each component was optimized to be Au:Cu:TCCA = 1:5:20. The prepared 0.2 wt% Au catalyst had a conversion of over 98% with over 99% selectivity during 24 h operation under the temperature of 180 °C and GHSV (gas hourly space velocity) of 90 h-1. Then, an over 6800 h pilot trial has been carried out to demonstrate its promising capability for practical applications. Moreover, several characterization methods accompanied by DFT calculations were used, and it was proved that the high stability after TCCA introduction may come from its high ability to prevent high valence Au from being reduced and to inhibit the coking effect and that the electron interaction between Au and Cu could facilitate the dispersion of Au and lead to higher catalytic activity. © 2016 The Royal Society of Chemistry.

Zhou K.,Tsinghua University | Si J.,Tianye Group Co. | Jia J.,Tsinghua University | Huang J.,Tsinghua University | And 3 more authors.
RSC Advances | Year: 2014

We reported the prominent effect of nitrogen-doped carbon nanotubes (N-CNTs) on reactivity enhancement in catalyzing acetylene hydrochlorination, which improved the TOF of Cu to ca. 1.2 min-1, proving that N-CNTs is a potential green substrate, and that the Cu-based catalyst is an alternative to the toxic conventional HgCl2 catalyst. © 2014 The Royal Society of Chemistry.

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