Oil storage base——application technology solution

1. Why do oil storage bases use fiber optic temperature detection?

        Most of my country's crude oil is "three highs" crude oil. Therefore, mastering the rheological properties of waxy crude oil is the key to scientific management of oil and gas storage, increasing crude oil output, and avoiding the "condensation tube" phenomenon. Temperature is an important physical quantity in the rheological parameters of waxy crude oil, and it is also an indispensable basic parameter in oil storage technology and oil transportation process design and pipeline operation. Therefore, accurate measurement of crude oil temperature is crucial to oil and gas storage and the operation and management of oil pipelines. Oil and natural gas are flammable and explosive. In order to achieve safe storage and transportation of oil and gas, people have conducted a lot of research. In the storage and transportation of oil and gas, factors such as ambient temperature and bumps will cause changes in the temperature in the tank, and there are potential accidents. Therefore, real-time monitoring of temperature is required in oil and gas storage and transportation. At present, the thermometers commonly used for measuring temperature are divided into contact thermometers and non-contact thermometers. These thermometers have various shortcomings in measuring oil and gas temperature. In order to make up for the shortcomings of previous temperature measurement methods, we are engaged in the research and development of fiber grating sensors. This advanced sensing technology in the world is used to monitor the temperature of oil and gas storage tanks, which fundamentally eliminates the unsafe factors that may be caused by other sensors themselves. Fiber Bragg grating sensors are modulated by wavelength. Since Morey first reported it in 1989, it has received widespread attention from countries around the world, and great progress has been made in theoretical and applied research. This new type of sensor uses light waves as signal carriers, fiber Bragg gratings as sensor probes, and optical fiber to transmit information. It is a safe and pollution-free sensor with the advantages of strong anti-electromagnetic interference ability, good electrical insulation, corrosion resistance, high sensitivity, small size, softness and flexibility, and no unsafe factors such as electric sparks. It has high measurement accuracy, a wide temperature measurement range, and a fast response speed. It can work under high temperature and high pressure. It can also be used for distributed online measurement of oil and gas temperature, which is convenient for on-site testing. It is particularly suitable for convenient and effective completion of sensing functions in flammable and explosive environments such as petrochemicals.

        With the rapid development of my country's national economy, the demand for crude oil and its processed products is increasing. In recent years, many large-scale petrochemical complex units and supporting oil tank farms have been built. There is a large amount of volatile oil vapor in these tank areas, especially above the floating roof of floating roof oil tanks. They are flammable and explosive gas environment areas and are very sensitive to open flames such as electrical sparks. Therefore, the intrinsic safety of measuring components is very important. .

The significance and necessity of project application

        In oil storage enterprises, metering, security and monitoring require a large number of sensors and data transmission. Since the air in the oil storage environment often contains a large amount of flammable gas, the components used must be explosion-proof. With the development of optical fiber technology, optical fiber sensing technology and optical fiber communication technology have matured. This project will use optical fiber sensor technology and optical fiber communication system to realize the full optical fiber metering automation of oil tanks in storage enterprises. The optical fiber liquid level sensor measures the liquid level of the oil in the storage tank. Combined with the temperature value measured by the temperature sensor, the density of the oil can be calculated, and then with the volume table, the quality of the oil can be calculated. The optical fiber liquid level sensor checks whether the position of the oil level reaches the upper limit. If it reaches it, an alarm message can be issued to prevent the occurrence of roof collapse accidents. In addition, the longitudinal and lateral temperature distribution in the tank can be tested by arranging temperature measurement points at multiple points in the tank, so as to effectively prevent the explosion caused by excessive temperature in the tank or the condensation of crude oil due to low temperature.

2. Grain safety monitoring

Advantages:

        No electricity entering the warehouse, all-fiber, inherently explosion-proof; lightning protection, anti-electromagnetic interference

        Grain + ambient temperature, non-parallel, distributed

        Integrated perimeter, gas monitoring (hydrogen sulfide, oxygen, carbon dioxide)

3. Oil and Gas Data Security Testing

        With economic development, the number of chemical storage tanks has increased significantly, and there are more and more large-scale and concentrated storage tank areas in China. Storage tank safety has always been a highly valued issue for departments at all levels in the chemical industry, fire protection and environmental protection departments, and enterprises. At present, my country's chemical storage tanks mainly use floating roof tanks and spherical tanks. The top of the floating roof oil tank adopts secondary sealing technology, but it is not completely sealed. There is a possibility that a small amount of chemical liquid and gas will leak from the sealing ring. These leaked gases are prone to fire under natural conditions such as high temperature in the sun and lightning strikes. Then fire detection is particularly important. Because storage tanks are outdoors, large in size, and have a large tank area, linear fire detectors are commonly used.

       DTS distributed fiber optic temperature sensor is a new generation of linear fiber optic temperature detector in the world, with the advantages of intrinsic explosion-proof, strong electromagnetic interference resistance, lightning protection, high measurement accuracy, light weight, small size, etc. In particular, the distributed fiber optic temperature sensor is a continuous distributed temperature fire detector, which can realize the temperature measurement at any point along the fiber optic line without measurement blind spots. The fiber optic cable is both a transmission medium and a sensing element, and no additional temperature sensor is required. It is easy to install and has high reliability. Its performance is better than that of traditional linear temperature detectors and is suitable for chemical tank fire monitoring applications.

4. Application of Haoyuan DTS Distributed Optical Fiber Temperature Measurement System

        This system uses today's advanced optoelectronic technology, communication technology, microprocessor technology, digital temperature sensor technology and original low temperature, strong electric field and humid environment operation technology. It can monitor the temperature in different environments, detect potential accidents early and minimize losses. At the same time, it can also provide a large amount of online monitoring data, providing a reliable basis for operators to fully understand the operation of power equipment.

Features of DTS distributed optical fiber temperature monitoring system

[Advancedness]: Based on the internationally popular distributed optical fiber temperature measurement technology, and on the basis of nearly 20 years of successful application experience abroad, this system has excellent technical performance and quality;

[Safety]: Optical fiber is used as the medium for temperature sensing and signal transmission. The sensor does not need power supply to work, is inherently safe, has excellent insulation performance and anti-electromagnetic interference, and the sensor installation meets safety regulations;

[Stability and Accuracy]: Temperature data is obtained by detecting the movement of light wavelength. The sensor is only sensitive to temperature, avoiding the problem that traditional sensors are easily affected by interference factors such as power supply fluctuations and transmission line losses. The system is stable and reliable; the temperature measurement accuracy reaches ± 1℃, the temperature resolution reaches 0.1℃;

[Long-term operation with high reliability]: The system runs safely and reliably, with stable performance, suitable for long-term continuous operation in harsh environments;

[Compatibility]: The monitoring host has its own standard communication interface, providing Ethernet port, RS232, USB, etc., combined with the integrated automation system of the variable power station, to achieve data sharing, simple management, and seamless connection with related systems;

[Economical]: The system cost is economical and reasonable, with high cost performance. After it is built and put into use, it can work unattended for a long time, with low maintenance cost;

[Ease of operation and maintenance]: The human-machine interface is friendly and easy to operate; the sensor has no zero drift, no need to calibrate again, and the system is maintenance-free;

5. Related Case Studies