Ⅰ.Industry background
A large number of high-voltage cables, coal conveying belts, coal yards, distribution cabinets and transformers in the steel plant are places that are easy to cause fire hazards.
Once a fire is caused, it will spread rapidly and it is difficult to put it out in a short time, which will not only lead to major property losses, but also cause casualties.
Ⅱ.Plant scope temperature solution
Ⅲ.Application location
3.1Application location
High and low voltage power cables and control cables are densely distributed in the cable tray, with narrow space and difficult heat dissipation. In case of fire accident,
the fire spreads rapidly along the cable tray and is difficult to put out. Explosion may be caused in flammable and explosive areas, with serious consequences.
Solutions:
The distributed temperature sensing system independently developed and produced by Weitan technology can monitor the temperature change of cable tray in the steel plant in real time and accurately locate the fire position.
The temperature measurement information can be uploaded to the intelligent AI online temperature monitoring platform for centralized display through RS485 interface.
Product comparison
Distributed Temperature Sensing System
1. Monitor temperature changes in real time.2. Early warning is possible before the fire occurs.3. The temperature sensing optical fiber is free from electromagnetic interference and environmental interference,
and can be used in any harsh environment with high temperature measurement accuracy.
Infrared temperature measurement system
1. Temperature change cannot be monitored automatically.2. You can only passively wait for the alarm after reaching the set temperature value
.3. The infrared thermometer shall be vertically aligned with the surface of the measured object, which is easily affected by environmental factors (measurement angle, ambient temperature, dust in the air, etc.), and the temperature measurement accuracy is low.
Field case
3.2 Power distribution room
Due to the very high temperature in the steel plant, all workshops are basically in a humid and hot environment, which often leads to the aging of electrical devices,
in which the oxidation problem is very serious, which is prone to problems such as power connection and device burning. The distribution range of electrical components in the steel plant is large,
and the distance between the site and the electrical control room is very far, and if the treatment time is relatively long after the fault, It will lead to the interruption of unit work, seriously affect the production rhythm and cause certain economic losses.
Solution 1:
The intelligent optical fiber temperature measuring device is designed by Hebei Weitan Technology for the early prediction of faults and fires caused by the aging of insulation or poor contact of high-voltage power equipment such as dynamic and static contacts, bus bars, switchgear switches, and transformers in high-voltage switch cabinets. Not subject to electromagnetic interference. Each intelligent optical fiber temperature measuring device can monitor 6 temperature measuring points. When the intelligent optical fiber is laid in the switch cabinet, the static contact is fixed with a high-temperature resistant silicone strap, and the outlet busbar is fixed with a P-type terminal. The intelligent optical fiber temperature measuring device can be installed in the secondary room or the control panel of the switch cabinet.
Product comparison
Fluorescence optical fiber temperature sensing system
1. The fluorescent optical fiber temperature sensing device has a fast inspection speed, which can monitor the temperature change of the measured point in real time.2. No electromagnetic interference, high stability, safety and reliability.
Wireless temperature measurement system
1. The inspection speed of wireless temperature sensor is slow, and the temperature data of monitoring points can be automatically transmitted every certain time.2. It is greatly affected by electromagnetic interference, and environmental factors are easy to interfere with the signal, with high false alarm rate.
Solution 2:
The fiber bragg
grating temperature measuring device independently developed by Hebei Weitan Technology can connect twelve fiber grating sensors in parallel for each channel, which can expand to 32 channels,
and can be drawn to dozens of kilometers away for remote monitoring, and multiple optical fibers are connected to the same processor. The different channels on the Internet constitute a quasi-distributed sensor network.
Product comparison
Fiber bragg grating sensing system 1. It can monitor the temperature change of the measured point in real time. 2. Multi-level temperature alarm/temperature rise rate/temperature rise trend can be comprehensively set for continuous monitoring.
3.The fiber grating detector and the optical cable are not charged,free from the interference of strong electric field and strong magnetic field, and the temperature measurement accuracy is high.
Wireless temperature measurement system
1. The wireless temperature sensor can automatically transmit the temperature data of the monitoring point every certain time.2. It can only passively wait for the set temperature alarm value.
3. It is subject to large electromagnetic interference, and environmental factors are likely to interfere with the signal, and the false alarm rate is high.
3.3Coal conveyor belt
Frequent cleaning of the coal conveying area causes the area to remain in a humid state for a long time. At the same time, the coal powder easily adheres to the related equipment or even enters the equipment and causes a short circuit. Because the belt is rotating,
once a fire occurs, the fire will spread quickly.
Solution
The distributed optical fiber temperature measurement system is very suitable for fire detection in coal transportation area because of its simple structure,
non-charged operation and corrosion resistance of the temperature sensing optical fiber laid on site. Install steel wire ropes on both sides of the belt, and fix the temperature
sensing fiber on the steel wire rope. In order to monitor the temperature at the rollers, place a metal temperature measuring box in the left and right gaps between the belt rollers,
and guide the temperature-sensing fiber through the tube. Into the metal temperature measuring box, put the temperature-sensing fiber into a
3-meter ring and place it in the temperature measuring box. The temperature of the roller due to friction can be directly detected through the thermal conductivity of the metal fiber.
Product comparison
Distributed Temperature Sensing System
1.Monitor temperature changes in real time.2. Early warning can be given before fire.
3. The temperature sensing optical fiber is free from electromagnetic interference and environmental interference, can be used in any adverse environment, and has high temperature measurement accuracy.
Infrared temperature measurement system
1. Temperature change cannot be monitored automatically.2. You can only passively wait for the alarm after reaching the set temperature value.
3. The infrared thermometer shall be vertically aligned with the surface of the measured object, which is easily affected by environmental factors (measurement angle, ambient temperature, dust in the air, etc.), and the temperature measurement accuracy is low.
Field case
3.4Coal yard
The accumulated coal will emit heat in the oxidation process. When the heat emitted is greater than the heat emitted, the heat will accumulate and the temperature will rise. Once the igniton point of the coal is reached,
it will spontaneously ignite, causing a large number of coal to be burned in vain. The ignited coal is sent to the conveying and grinding equipment, resulting in combustion and explosion accidents.
Therefore, it is necessary to monitor the temperature of the coal yard in real time, find out the fire hazards at the first time and deal with them as soon as possible.
Solution
The temperature sensing optical fiber is laid on the fire-resistant brick wall at the top of the coal pile and the inner wall of the coal retaining wall. The temperature sensing optical fiber can also be added at the bottom of the coal yard, which can be arranged at circular intervals.
3.5Transformer
Once the transformer fails, it is easy to cause the collapse of the power grid and serious property losses. After the fire, the fire is fierce and difficult to extinguish.The transformer is directly burned,
or the power is cut off, which will affect our work and life. In serious cases, it may cause a large-area fire, and even transformer explosions occur from time to time, causing casualties. Therefore, it is very important to do a good job in fire prevention and extinguishing.
Solution 1
The intelligent optical fiber temperature measuring device mainly monitors the temperature and fire monitoring of hot spots such as the winding and iron core of the transformer.
The intelligent optical fiber temperature measuring device is installed in the transformer terminal box. The intelligent optical fiber detector enters the iron core and winding coil along the conduit, and the temperature sensing point at the end of the detector is fixedly installed with the winding coil.
Product comparison
Fluorescent optical fiber temperature measuring system
1. The fluorescent optical fiber detector is close to the winding and can accurately sense the temperature change.2. The inspection speed is fast, and the temperature change of the measured point can be monitored in real time.
3. Free from electromagnetic interference, high stability, safety and reliability.
PT100 temperature sensor
1. PT100 temperature sensor can not be attached to the winding, but can only measure the winding temperature indirectly through the oil temperature, with low temperature measurement accuracy
.2. The sensor uses thermal resistance or thermocouple to measure temperature, and the alarm response is slow.3. It is greatly affected by electromagnetic interference, and environmental factors are easy to interfere with the signal, with high false alarm rate.
Solution 2
Cable type linear thermal fire detector is an intelligent linear thermal fire detector with independent intellectual property rights developed by Weitan technology. It can be used as a separate circuit or connected to the host of fire alarm controller through input module.
Product comparison
Temperature sensing cable
1. The temperature sensing cable is tightly wound on the transformer, which can quickly sense when the temperature changes, and the temperature measurement accuracy is high.2. Free from electromagnetic interference, high stability, safe and reliable.
PT100 temperature sensor
1. PT100 temperature sensor can not be attached to the winding, but can only measure the winding temperature indirectly through the oil temperature, with low temperature measurement accuracy
.2. The sensor uses thermal resistance or thermocouple to measure temperature, and the alarm response is slow.3. It is greatly affected by electromagnetic interference, and environmental factors are easy to interfere with the signal, with high false alarm rate.
Field case
Post time: Jan-08-2022