41results about How to "Improve safety production performance" patented technology

The invention provides a mine ventilating fan control system capable of automatically adjusting air quantity. The mine ventilating fan control system comprises a frequency conversion system, a programmable logic control (PLC) system and an inspection and monitoring system. The frequency conversion system comprises a power source wire leading-in device, a power source feed device and a frequency converter. The PLC system comprises a control power source wire leading-in device, a control power source feed device and a PLC device. The inspection and monitoring system comprises an operating platform, a display screen, a wind pressure transducer, a vibration transducer, a temperature transducer, and the like. A closed-loop control link is set in the PLC device, and the output frequency of the frequency converter is controlled by taking ventilating condition signals of a working face, which are acquired from the sensors or a mine local area network, as closed-loop feedback signals according to a difference between a set value and a practical sampled value, so as to automatically adjust the air quantity of mine ventilating fans. Two sets of facilities with relative independence are arranged in a speed adjusting link, the control link, an inspection link and an operating link to respectively perform control and online inspection on the two mine ventilating fans, so that the mutual switchover of the two mine ventilating fans from working to standby can be completed in a short time.

The invention relates to a spray drying system for wall-attaching materials, and relates to the technical field of material drying. According to the invention, a layer of air wall wind with adjustable temperature, humidity and air volume is directly formed at the power-attaching part in a tower, the temperature and the humidity of the air wall wind are lower than the thermal boning temperature and the moisture absorption humidity of powder and particle materials, the air wall wind and the wind in the tower are finally mixed to form mixed wind, the temperature and humidity of the mixed wind are lower than the thermal boning temperature and the moisture absorption humidity of the powder and particle materials, and the temperature of the particle materials under the action of air wall wind before contacting the tower wall is lower than the thermal boning temperature. With the adoption of the system provided by the invention, three wall-attaching conditions of materials can be solved or reduced, and the effects of improving the production efficiency, improving the per unit yield, reducing energy consumption, prolonging the continuous production time, improving the production safety and the improving the quality of a product are achieved through high air inlet temperature.

The invention aims to provide a process of producing diphenyl carbonate by non-solvent method. The process can improve the quality of proeducts and also reduce the production cost of products and the waste discharge. The method comprises the following steps: melting phenol, and heating up to 110-130 DEG C; adding DMF or N,N-dimethylaniline or analogs thereof as catalyst in an amount of 0.03-3% of phenol; maintaining the temperature, and introducing phosgene for photochemical reaction while stirring; heating up to 140-180 DEG C and maintaining for 1-5 hours; and performing reduced pressure distillation to obtain the final product. The new process provided by the invention improves the quality and yield of products, completely eliminates sodium chloride mother liquid and waste water and reduces distillation residues, reduces the production cost, and achieves the purpose of clean production. The operation of phenol system recovery and the procedure of ingredients are reduced, the production efficiency is greatly increased, the operation is more stable, and the safety of production is improved.

The invention belongs to leakage detection technology, and relates to an H-Q characteristic curve-based pipeline breakage and leakage positioning method. The method is characterized by comprising steps A and B, wherein the step A comprises four sub-steps for initialization; and the step B comprises six sub-steps for monitoring and positioning to finish pipeline breakage and leakage positioning. The H-Q characteristic curve-based pipeline breakage and leakage positioning method has the advantages of performing timely and accurate judgment and positioning on the breakage and leakage of a pipeline running under a complex working condition so as to maximally reduce damage caused by the breakage and leakage of the pipeline, and simultaneously improving the security and the reliability of production running to ensure that each production process on the ground realizes continuously and stably running and fulfill the aims of saving energy, reducing consumption and improving economic benefit.

A production scheduling and safety management and control system comprises a system hardware and network platform, and the system hardware and network platform collects production related data and transmits the data to a database management system platform. The system is characterized by also comprising a production scheduling subsystem, a safety management and control subsystem, an emergency management subsystem and a production and operation integrated display subsystem; and the production and operation integrated display subsystem displays production and operation integrated information of a company, concentratedly manages, integratedly displays and unifiedly regulates an SCADA system, a production scheduling system, a safety management and control system, vehicle positioning management and a 3D simulated training system, can call and display all information conveniently and flexibly, can be associated with a computer network system, a video monitoring system and other independent computer work stations, realizes integrated display for graph and video image information of computers, and satisfies different display requirements for monitoring, commanding and scheduling.