Why does the power supply and distribution system of a coal preparation plant need to use a distributed fiber optic temperature measurement host
A large number of power cables are laid on cable trenches and workshop bridges from high and low voltage distribution rooms to equipment in various workshops. It is inevitable that many cable terminals and intermediate joints will appear between them. The safety of these power cables is closely related to the normal production of coal preparation plants. If the overheating problem of cables and intermediate heads cannot be detected and dealt with in a timely manner, it is likely to cause major safety accidents such as fires and explosions. In order to effectively prevent accidents, fire monitoring systems are widely used in coal preparation plants.
Coal preparation plant
Design scheme of distributed fiber optic temperature measurement host system
Lay optical cables on the surface of monitoring cables, with a focus on monitoring cable connectors and cable sleeves. Cable trench is mainly used as a centralized channel for laying various cables between buildings in the factory area. Due to long-distance channels and concealed installation, once a fire occurs during large-scale voltage and current cable laying, it is difficult for workers to detect and quickly take remedial measures, which will inevitably cause losses. Lay temperature sensing optical cables on the surface of the monitoring optical cable, while paying attention to mid-range monitoring to complete automatic measurement and constantly monitor the temperature changes on the surface of the cable. When the temperature change reaches the warning value, the host part of the monitoring room will immediately issue sound and light warnings and position reminders, so that the on duty personnel can solve the problem as soon as possible.
Cable trays use specific processing components to assist in laying various cable channels, similar to the characteristics of cable trenches. Usually, temperature sensing optical cables are laid on the surface of the intermediate head or the surface of the tested cable along the direction of the cable bridge, and the specific location of abnormal cables is further confirmed based on the temperature changes of the cable, effectively completing fire warning.
Application of Distributed Fiber Optic Temperature Measurement System in Coal Preparation Plant
The fiber optic cable detector is installed in the cable tray and cable trench. Once the temperature exceeds the limit, the system host will output a contact signal to the fire alarm host and emit an audible and visual alarm. The fire alarm host is generally installed in the equipment room cabinet, and various collected alarm signals are uploaded to the upper computer monitoring software through a switch. By monitoring the temperature of cables and cable joints, we can gain a deeper understanding of cable insulation aging issues, promptly address safety hazards, and greatly improve the reliability of cables and cable joints.
Selection of explosion-proof fiber optic temperature measurement host
Each workshop of the coal preparation plant needs to constantly pay attention to fire prevention, waterproofing, explosion prevention, lightning protection, etc. The production workshop and warehouse need to strictly follow the “Coal Preparation Plant Safety Regulations” to implement a series of protective measures. The fiber optic temperature measurement host includes indoor universal type, outdoor type, and explosion-proof type. Both the raw coal preparation workshop and the coal storage yard are places where coal dust is concentrated, so explosion-proof fiber optic temperature measurement hosts and supporting systems are installed in the factory area.
At present, the distributed fiber optic temperature measurement system is widely used in the fire alarm system of coal preparation plants, which can not only eliminate the safety hazards of high and rapid cable temperature rise in the distribution system, but also greatly reduce the possibility of electrical fires, achieving multi-point, real-time, and online monitoring of power system operating equipment. Distributed fiber optic temperature measurement technology has been widely applied and recognized in power systems both domestically and internationally, and is an ideal fire alarm system with broad application prospects.