针对国内外冷却塔风机故障报警装置误报漏报严重问题,在研究主要故障发生机理的基础上,设计了一种用于冷却塔风机的新型故障监控系统。主要监控风机叶片和传动轴失效断裂情况,及时报警停机,避免叶片或传动轴甩出砸坏相关设施的经济损失...针对国内外冷却塔风机故障报警装置误报漏报严重问题,在研究主要故障发生机理的基础上,设计了一种用于冷却塔风机的新型故障监控系统。主要监控风机叶片和传动轴失效断裂情况,及时报警停机,避免叶片或传动轴甩出砸坏相关设施的经济损失。该监控系统采用西门子S7-200系列PLC和WinCC监控软件相结合的监控模式,采用S7-200 PC ACCESS作为OPC服务器实现PLC和WinCC监控软件之间的通讯。生产实践证明,此监测系统明显提高了风机故障监控的可靠性,能够有效地减少风机重大事故的发生,具有良好的推广应用价值。展开更多
Using an available compound 3 pentanone(1) as starting material, the key intermediate compound 4,6 dimethyl 3,7 nonandione(5) was synthesized through the addition elimination of silylenol ether and Michael addition of...Using an available compound 3 pentanone(1) as starting material, the key intermediate compound 4,6 dimethyl 3,7 nonandione(5) was synthesized through the addition elimination of silylenol ether and Michael addition of α methylene 3 pentanone(4) with silylenol ether(2). In the presence of chiral reagent 6 β phenyl amino 3 β,5α chlorestandiol(7), compound (5) was reduced by KBH 4 directly to give Tobacco Beetle Pheromone (7S) (-) 4,6 dimethyl 7 hydroxyl 3 nonanone(6). 25 D=-35 87°( c =0 23, CHCl 3), overall yield 23 9%.展开更多
文摘针对国内外冷却塔风机故障报警装置误报漏报严重问题,在研究主要故障发生机理的基础上,设计了一种用于冷却塔风机的新型故障监控系统。主要监控风机叶片和传动轴失效断裂情况,及时报警停机,避免叶片或传动轴甩出砸坏相关设施的经济损失。该监控系统采用西门子S7-200系列PLC和WinCC监控软件相结合的监控模式,采用S7-200 PC ACCESS作为OPC服务器实现PLC和WinCC监控软件之间的通讯。生产实践证明,此监测系统明显提高了风机故障监控的可靠性,能够有效地减少风机重大事故的发生,具有良好的推广应用价值。
文摘Using an available compound 3 pentanone(1) as starting material, the key intermediate compound 4,6 dimethyl 3,7 nonandione(5) was synthesized through the addition elimination of silylenol ether and Michael addition of α methylene 3 pentanone(4) with silylenol ether(2). In the presence of chiral reagent 6 β phenyl amino 3 β,5α chlorestandiol(7), compound (5) was reduced by KBH 4 directly to give Tobacco Beetle Pheromone (7S) (-) 4,6 dimethyl 7 hydroxyl 3 nonanone(6). 25 D=-35 87°( c =0 23, CHCl 3), overall yield 23 9%.
