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Gao B.J.,Hebei University of Technology | Li H.J.,Hebei University of Technology | Chen Y.F.,Hebei University of Technology | Chen Y.F.,Sinoma Technology and Equipment Group Co. | Dong J.H.,Hebei University of Technology
Procedia Engineering

The gully shape thinning due to corrosion often occurs in the cold and hot syngases mixing tee and its downstream straight pipe used in the gas quenching system of the coal gasification process, and leads to leakage and cracking of the pipe which endangers the system safety. Analysis indicates that droplets in the cold syngases turn out to be corrosive droplets when absorbing H2S and CO2 at working pressure and temperature. In this paper, the flow, aggregation and evaporation of the corrosive droplets are simulated with the k-É turbulence model, the species transport model and the discrete phase model by FLUENT. It reveals that the corrosive droplets would aggregate to the downstream of the mixing tee at 0o orientation. The distance of the downstream aggregation is 1.5 m. The aggregation and evaporation of corrosive droplets causes the corrosion thinning of the droplet aggregation region, which leads to tear cracking under high stress. An improved structure is proposed to avoid the corrosive droplet aggregation, in which a fluid guidance is conically flared and welded before the branch entrance. The fluid guidance is made of Inconel8825. The cold syngases flow inside the fluid guidance, and the hot syngases flow outside the fluid guidance. The cold and hot fluid exchanges heat through the guidance but without mixing. The mixing is postponed to the downstream. It shows that the aggregation of the corrosive droplet is effectively eliminated and droplet concentration at the downstream wall is less an order of magnitude of the upstream, which is helpful to avoid the corrosion and cracking of the structure. © 2015 The Authors. Source

Li Y.,China Academy of Safety Science and Technology | Wang H.,Sinoma Technology and Equipment Group Co.
QR2MSE 2013 - Proceedings of 2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering

Chemical industry park development has become an inevitable trend. However, due to the high density of numerous enterprises and workers, it easily leads to mass death, casualty and domino effects in case of any accidents, so the quantitative area risk assessment (QARA) and safety planning are particularly important. Taking a chemical industry park as an example and based on the current research, this paper conducts quantitative risk assessment with CASSTQRA software to work out the integrated individual risk contour distribution and social risk capacity curve and proposes a safety planning combining with an acceptable risk criterion to ensure the safety and long-term development of the park. © 2013 IEEE. Source

Sun J.,Tianjin University | Luo X.,Tianjin University | Jiang S.,Sinoma Technology and Equipment Group Co. | Wang W.,Tianjin University | And 3 more authors.
Chemical Engineering and Technology

A computational fluid dynamics model was developed to investigate the hydrodynamic characteristics of a novel orthogonal fixed-valve tray, which offers a larger effective contact perimeter under the same orifice area than its previously reported counterparts. The liquid-gas phases were simulated in the Eulerian framework, with the interphase momentum transfer source term based on the experimentally obtained liquid hold-up correlation. The simulation results were consistent with the experimental data. In addition, the gas hold-up profile of this new design was compared with its triangular cousin under the conditions of a typical run, showing that the former has a higher froth height, which indicated better interphase contact on the tray. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Zhang C.S.,University of Jinan | Jing S.H.,University of Jinan | Ma Q.L.,CVIC Software Engineering Co. | Shi L.G.,Sinoma Technology and Equipment Group Co.
Applied Mechanics and Materials

With the rapid development of cement industry in China, looseness of information management and hardness of production line optimization control have became an utmost important issue. In this paper, we design and implement a remote optimization and control system via B/S architecture, which is under the model of ASP.NET MVC. Conclusively, this system implements the functions which are data analysis and processing of cement enterprises, optimization control of production line and meta-analysis of enterprise information. © 2014 Trans Tech Publications, Switzerland. Source

Jiang Y.,Nanchang University | Tan Z.,Nanchang University | Liu L.,Hebei University of Technology | Wang Z.,Sinoma Technology and Equipment Group Co. | Wei L.,Nanchang University
Chinese Journal of Environmental Engineering

Pulse-jet cleaning process simulation of fabric filter was conducted based on computational fluid dynamics (CFD) method, using a three-dimensional, compressible and unsteady flow mathematical model. The differential pressure on the filter bag was reported and compared with the experimental values, which verified the reliability of the simulated model. The effects of the jet pressure, jet height, filter bag diameter, filter bag length on the dust cleaning performance were studied based on the response surface methodology (RSM). A quadratic polynomial prediction model of the above-mentioned impact factors was developed and optimized. The results show that optimum differential pressure peak value was obtained when jet pressure was 0.3 MPa, jet height was 0.2 m, filter bag diameter was 0.16 m and filter bag length was 6 m. The overall uncertainty regarding the optimization and simulation results was lower than 3%. This investigation offers substantial insight for the design and the optimization of pulse-jet cleaning of fabric filters. Source

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