HJKIR HomePage
Many important equipment in petroleum and petrochemical production work under high temperature and high pressure, which lurks some flammable and explosive hazards. Strict on-line monitoring of the production process is required to eliminate hidden dangers in time. The thermal imager can detect the corrosion, fracture, thinning, blockage and leakage of product transmission pipes, fire-resistant and thermal insulation materials, and various reaction furnaces, and can quickly and accurately obtain the two-dimensional temperature distribution on the surface of equipment and materials. Thermal imagers are used in refineries to detect the leakage of catalytic cracking units, reactor tail gas equipment and furnaces, safety valves and condensate valves, and the leakage of underground pipelines, which can quickly and accurately find out the heat leakage points in the early stage. It is very effective to check the loss, crack and wear of refractory materials in the furnace body, fuel gas and dust discharge pipes, reactor tank and transfer line to prevent accidents and reduce energy consumption.
1. Detection of coke deposition at the bottom of Cracking Fractionator: coke deposition at the bottom of Cracking Fractionator is the key to the long-term operation of Eureka unit. When the thermal imager is used to measure the coke deposition at the bottom of the tower, the thermal image characteristics of the outer wall can determine the degree of coke deposition in each part of the tower, and guide the process adjustment and determine the best operation scheme according to the results. The practice shows that after the combination of the detection method and the process, the operation cycle of cracking and fractionation is extended from the original average of 30 days to 268 days, and obvious economic benefits are obtained.
2. Evaluate the lining damage of acetaldehyde acetate device: in petrochemical equipment, there are multiple lining materials inside the key equipment of acetaldehyde acetate device (catalytic regenerator, reactor, demister, etc.). Using the thermal imager to detect the temperature field of its outer wall, and then combined with the heat transfer theory to calculate the thickness of its internal insulation layer, we can understand the lining damage degree under the operation of the device, so as to provide a reference for formulating the maintenance plan.
3. Detect the local "hot spot" of the cracking furnace tube: the cracking furnace is the heart of ethylene production, and the coking in the furnace tube will seriously affect its service life. The infrared thermal imager can be used to test the furnace tube in the furnace through the peephole, and the thermal image characteristics of the hot spot can be obtained, which is the implementation method of maintaining the furnace tube.
4. Detection of catalytic cracking unit: catalytic cracking unit is an important unit in kerosene plant. The lining condition of its core devices (catalytic regenerator and settler) in production and operation is directly related to the safety of the cylinder wall, so it needs to be detected and diagnosed at any time. Carry out regular wall temperature detection on them with a thermal imager, analyze the lining condition, possible fault location, degree and development trend, and provide basis for maintenance.
5. Measurement of the outer wall temperature of the thermal pipeline: the steam thermal pipeline is crisscrossed and widely distributed in the refinery. The insulation material of the outer wall of the pipeline will be gradually damaged and dropped during the production process, and the outer wall temperature of the pipeline will rise at any time, causing a lot of heat loss. Use the thermal imager to scan and measure the temperature of the outer wall of the thermal pipeline. According to the measured data, calculate the heat loss of the outer wall of the thermal pipeline and take measures.
In a word, the real-time monitoring and early fault diagnosis of the operation status of production equipment in the petroleum and petrochemical industry by using infrared thermal imager is one of the main means to ensure safe production. The online infrared thermal imaging thermometer is used to monitor the above parts in real time, and the image temperature data is uploaded to the command center in real time through the transmission network for analysis and early warning on the background monitoring software.
System architecture
The system is composed of monitoring front end, transmission network and monitoring background (power supply follows the principle of proximity); If necessary, it can be linked with alarm broadcasting, fire protection and other systems. The system is based on UDP protocol and interconnected through Gigabit Ethernet to build a CS architecture system, which is stable and easy to expand.
System diagram
Monitoring front end
- Use 640 × 480 high pixel infrared camera, with a customized 5mm-35mm special temperature measuring lens, the maximum field angle can reach 95 ° × 78 °, the farthest monitoring distance can reach 30m;
- Accurate temperature measurement algorithm, temperature measurement accuracy ± 2 ℃ or ± 2%, full screen temperature measurement, high consistency;
- The air-cooled explosion-proof cover enables the equipment to work normally at a high temperature of 80 ℃;
- Multi screen analysis software, multiple pictures are displayed at the same time, temperature measurement analysis and temperature warning are carried out at the same time;
- Gigabit network interface standard, 50Hz high frame rate, real-time detection of each high-temperature abnormal point, eliminate hidden dangers.
Background monitoring interface
Equipped with multi split screen monitoring software, it can monitor and display the maximum temperature and minimum temperature of each part in real time, set the alarm threshold and store the temperature data.
System description of thermal imaging fire alarm monitoring system
（1）Accurate temperature monitoring
The core of this system is to monitor the temperature of the transmission pipeline. How to obtain the accurate temperature has become the core. In the field of infrared thermography, there are many factors that affect the accurate temperature measurement. For the application object of this system, a unique processing technology is adopted to compensate the influence of different media on the received infrared radiation, so as to accurately measure the temperature and prevent false alarm.
(2) 24x7 real-time monitoring
Advanced equipment is used to collect the temperature on the synchronous surface, with clear imaging and 24-hour real-time monitoring. Adopt protective cover according to the environment to prevent corrosion and dust, and effectively protect the normal operation of the equipment itself.
(3) Intelligent alarm for blast furnace
The thermal imaging front-end temperature measurement unit is set according to the area of the furnace body and installed on the upper Packway enclosure of the warehouse. The thermal imagers are evenly distributed at a certain angle to eliminate the blind area of thermal imaging monitoring. When the temperature of furnace skin rises, panoramic monitoring and active alarm can be carried out.
（4）Intelligent analysis method
Based on the intelligent analysis method of temperature threshold and thermal image characteristics, the monitoring system can find hot spots and capture them in time.
(5) Professional analysis software
This system is equipped with professional analysis software with powerful functions. It can analyze images in the form of points, lines, surfaces and various areas to find problem points. Temperature data can be stored for later analysis.
