石油パイプラインのオンライン監視システムで分散型光ファイバー温度測定を使用する利点

The importance of pipeline monitoring systems

In China, underground pipelines are indispensable material transportation facilities for important systems such as natural gas, 油, 都市暖房, そしてガス. 国民経済の発展とエネルギーと物質の輸送にとって非常に重要です. 同時に, パイプライン施設には巨額の投資があり、そのほとんどは溝の中に設置されるか、地面の下に埋められます。. 宇宙ではある程度の隠蔽性を持っています. 人為的または自然的理由により損傷した場合, タイムリーに検出するのは困難です. 可燃性および爆発性物質の漏洩は、安全上に重大な危険をもたらします。. 火災・爆発事故を起こした場合, それは多大な経済的損失をもたらすだろう, そして重大な死傷者や社会的混乱を引き起こすことさえあります.

Measurement of steam temperature in power plants

Temperature measurement in power plants generally uses thermocouple devices, which are installed on the measured pipeline through temperature sleeves. The temperature sleeves are welded to the pipeline in the form of fillet welds, forming a closed communication space between the sleeve and the pipeline. The thermocouple passes through the sleeve and is exposed in the steam flow field inside the pipeline to achieve the purpose of measuring steam temperature. During the operation of the unit, high-temperature and high-pressure steam flows in the pipeline, and the flow rate of superheated steam is generally 40-50m/s. Due to the presence of the casing, the high-speed steam will continue to flow into the closed steam flow channel of the casing. As one end of the flow channel is closed, steam will form vortices at the closed end, which will cause blow and erosion on the inner wall of the casing, resulting in a thinning of the inner wall thickness of the pipe seat. Especially near the weld seam at the top of the closed steam flow channel of the casing, the deformation of the flow channel caused by the weld seam forms turbulent flow. したがって, steam blow and erosion around the weld seam is particularly severe. In the actual operation of the unit, accidents of steam leakage caused by steam blow and erosion thinning of the casing often occur.

分散型光ファイバー 温度測定システム

の 分散型光ファイバー温度測定システム based on Raman reflection is a new type of fiber optic temperature measurement technology developed in recent years. It has the advantages of ranging, reusability, 高解像度, non-destructive alarm, output optical signal, 電磁干渉防止, moisture-proof and anti-corrosion, and small error. したがって, it can be used for temperature measurement in harsh conditions such as strong electromagnetic fields, 高電圧, 大電流, flammable and explosive, and complex geometric environments. Due to the complexity and high economic cost of detecting defects caused by corrosion in oil pipelines in oil fields.

Distributed fiber optic sensing measurement technology

Distributed fiber optic sensing measurement is a technology that utilizes the principle of fiber optics to measure continuous lines. Fiber optic can serve as a sensing element and also a component for transmitting temperature. Fiber optic temperature measurement systems can continuously measure environmental parameters distributed along the entire length of the fiber, while obtaining the measured spatial distribution status and information that changes over time. If the optical fiber is laid along the pipeline as a sensing element, any point along the entire length of the optical fiber is a sensitive point, belonging to long-distance measurement. Theoretically, the sensing distance can be any length, the spatial resolution can be any size, the detection range is wide, and the characteristics of the optical fiber are not affected by electromagnetic interference, 高感度, 高い信頼性, 耐食性, small volume, and many other advantages. It can meet the real-time online warning monitoring of various situations along dozens of kilometers of pipelines.

FJINNO has independently developed an online monitoring system for oil pipelines based on a distributed fiber optic temperature measurement system. It can accurately judge various types of defects on the inner wall of oil pipelines without damaging the pipeline, and accurately locate the spatial location of defects. The monitoring system can measure and obtain parameters such as temperature, プレッシャー, and fluid velocity. By inputting these parameters into the experimental data fitting formula, the wall thickness at the defect on the inner wall of the pipeline can be accurately calculated. The development of this monitoring system is of great significance for the safe operation of oil pipelines.

Fiber optic monitoring device for pipeline vibration

Fiber optic vibration sensors can monitor and analyze municipal pipelines such as natural gas in real-time, enabling the detection and early warning of natural gas pipeline infringement incidents and the detection and analysis of damage and leakage points.
Pipeline vibration fiber optic monitoring system, including fiber optic sensors, fiber optic temperature measurement host, 監視システム, and alarm warning display screen, 等; Fiber optic sensors are fixed to the pipeline, including fiber optic cables laid along the pipeline and clamps used for installing fiber optic cables and forming a fixed connection with the pipeline; センシングデバイスには、光ファイバーケーブルの振動を監視するための振動収集器と、光ファイバーケーブルの温度変化を監視するための光ファイバー温度計が含まれています。; 振動コレクターと光ファイバー温度計は両方とも監視コントローラー信号に接続されています, 警報装置信号に接続され、警報情報を送信し、警報コマンドを警報装置に送信します。.

光ファイバー温度センサー, インテリジェント監視システム, 中国の分散型光ファイバーメーカー