The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Umesh R Desai - One of the best experts on this subject based on the ideXlab platform.
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self supported Flare Stack vibrations in ammonia plant
Process Safety Progress, 2010Co-Authors: Rob Stevens, Umesh R DesaiAbstract:Qatar Fertilizers Company (QAFCO), Ammonia-3 is a 1,500 metric tons per day (MTPD) plant, designed, supplied, and commissioned by a company (Division of Thyssen Krupp Group) (UHDE) in 1997. The main gas Flare Stack is a self-supported free-standing structure with a height of 70.5 m, located in the middle of the plant. Excessive vibrations/shaking of the Flare and Flare structure were observed due to mixing of NH3 and CO2 rich gases in the presence of water. Ammonium carbonate and bicarbonate sludge (salts) formed in the Flare Stack and increased resistance to the gas flow path. The partial blockage increased the pressure at the Flare-Stack bottom and the sudden release of the gases gave vibrations (surging effects) to the Flare Stack. The Flare Stack was drained after unplugging the Stack-bottom drains. Hot-process gases (167°C) from the low temperature shift converter (LTS) outlet were lined up to the Flare Stack in small quantity to melt the deposits. Flare vibrations completely stopped after 3 days. Inspection of the weld joints and foundation bolts was done, and no abnormalities were found. No vibrations were observed during all normal/emergency plant shutdowns faced after the incident. The work describes the root cause of unique experience of Flare-Stack vibrations, and the way the problem was solved online. © 2010 American Institute of Chemical Engineers Process Saf Prog, 2010
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Self‐supported Flare‐Stack vibrations in ammonia plant
Process Safety Progress, 2010Co-Authors: Rob Stevens, Umesh R DesaiAbstract:Qatar Fertilizers Company (QAFCO), Ammonia-3 is a 1,500 metric tons per day (MTPD) plant, designed, supplied, and commissioned by a company (Division of Thyssen Krupp Group) (UHDE) in 1997. The main gas Flare Stack is a self-supported free-standing structure with a height of 70.5 m, located in the middle of the plant. Excessive vibrations/shaking of the Flare and Flare structure were observed due to mixing of NH3 and CO2 rich gases in the presence of water. Ammonium carbonate and bicarbonate sludge (salts) formed in the Flare Stack and increased resistance to the gas flow path. The partial blockage increased the pressure at the Flare-Stack bottom and the sudden release of the gases gave vibrations (surging effects) to the Flare Stack. The Flare Stack was drained after unplugging the Stack-bottom drains. Hot-process gases (167°C) from the low temperature shift converter (LTS) outlet were lined up to the Flare Stack in small quantity to melt the deposits. Flare vibrations completely stopped after 3 days. Inspection of the weld joints and foundation bolts was done, and no abnormalities were found. No vibrations were observed during all normal/emergency plant shutdowns faced after the incident. The work describes the root cause of unique experience of Flare-Stack vibrations, and the way the problem was solved online. © 2010 American Institute of Chemical Engineers Process Saf Prog, 2010
Jae Wook Ko - One of the best experts on this subject based on the ideXlab platform.
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Reduction of thermal radiation by steam in Flare Stack system
Korean Journal of Chemical Engineering, 2012Co-Authors: Byung Seok Ko, Jae Mo Yang, Dongil Shin, Chulhwan Park, Jae Wook KoAbstract:A Flare system is installed for the enhancement of process safety, and the stable combustion is one of the most important elements. The main function of the Flare system is the combustion of the flammable or toxic materials into non-hazardous materials, but combustion heat is released from a Flare system. In this study, the effect of the external and internal steam injections in the Flare Stack on the reduction of the thermal radiation was investigated. The ignition possibility by the change of steam amount and the effect of the steam on the thermal radiation were also analyzed by using consequence analysis software. In case of thermal emission of oil refinery plants through improved steam injection, the injection of 120% steam rather than the conventional method enabled the reduction of the Flare Stack height. It could reduce the height of Flare Stack by 20%.
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reduction of thermal radiation from Flare Stack by Flare gas recovery unit
Journal of The Korean Institute of Gas, 2011Co-Authors: Chulhwan Park, Jae Wook KoAbstract:Abstract - During process operations, overpressure can be caused by operator's error or malfunction of the device. To prevent this overpressure, gas was released through blowdown system. Because most of released gases are the hydrocarbon mixture and have flammable and toxic properties, the gas is released after burning in Flare Stack. The increase of scale and complexity of plant requires higher or additional Flare Stacks. This study tried to solve this problem through Flare gas recovery system. Key words : Flare Stack, API 521, thermal radiation, FGRU † I. 서 론 정유·화학플랜트는 원유 또는 천연가스 등을 원료로 에틸렌, BTX, 합성수지, 합성섬유원료 등과 같은 석유화학제품을 생산한다. 화학공정에서는 생산성을 높이기 위하여 고온, 고압으로 운전되며 모든 물질이 배관과 탱크와 같은 시설 내부에서 반응, 합성, 분리, 이송 및 저장된다. 정유·화학플랜트의 정상운전 중에 최적화된 안전장치에도 불구하고 운전 † 주저자:jwko@kw.ac.kr자의 실수나, 장치의 고장으로 인해 공정 내의 문제점을 야기시킨다. 그 중에서 가장 위험한 상황은 공정 내 이상과압이 형성되는 경우이다. 현재 대부분 정유·화학플랜트들은 생산성 향상을 위해 공정들의 대형화, 집중화가 이루어져 있으며 그로 인하여 공정내의 많은 탄화수소가 축적되어 있다. 만약 압력이 과도하게 상승하면 장치나 배관이 파열되면서 독성물질이나 가연성물질이 누출되는 원인이 된다. 이러한 유형의 사고를 예방하려면 공정 내에 과압을 해소해야 하며 과압을 해소하기 위해 내용물인 가스를 방출해야 한다. 이와 같이 가KIGAS Vol. 15, No. 1, February, 2011(Journal of the Korean Institute of Gas)
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quantitative analysis of thermal radiation in Flare Stack
Journal of the Korean Institute of Gas, 2010Co-Authors: Sangyong Jung, Chulhwan Park, Jae Wook KoAbstract:The most important element for improving the process safety that occurs from the Flare system installed to convert into safe materials by burning the inflammable or toxic gases within the process and this is specified in the API 521 Code so that the radiation does not cause a risk factor. The flames that occur from the Flare Stack holds the shape of jet fire due to the pressure and flow velocity of discharge gas. This study has identified the shape of flames by using the Chamberlain Model rather than the API 521 Code method, analyzing the radiation due to this.
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analysis of flame shape in Flare Stack
Journal of the Korean Institute of Gas, 2009Co-Authors: Sangyong Jung, Chulhwan Park, Jae Wook KoAbstract:Relief systems can improve the process safety because it has the function for the prevention of overpressure. Flare Stacks is necessary to avoid explosion, radiation, or toxicity by waste-gas emitted from relief system. Safe combustion is one of the important factors to improve safety and the quantity and velocity emitted is ruled in the API code 521. Due to the pressure of released gas and mass flow, a flame from Flare Stack is similar to jet fire. In this study, we have investigated the effect of flame form on complete combustion and heat emission. API code was similar to jet fire model in flame length, the flame had an effect on the ground.
Rob Stevens - One of the best experts on this subject based on the ideXlab platform.
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self supported Flare Stack vibrations in ammonia plant
Process Safety Progress, 2010Co-Authors: Rob Stevens, Umesh R DesaiAbstract:Qatar Fertilizers Company (QAFCO), Ammonia-3 is a 1,500 metric tons per day (MTPD) plant, designed, supplied, and commissioned by a company (Division of Thyssen Krupp Group) (UHDE) in 1997. The main gas Flare Stack is a self-supported free-standing structure with a height of 70.5 m, located in the middle of the plant. Excessive vibrations/shaking of the Flare and Flare structure were observed due to mixing of NH3 and CO2 rich gases in the presence of water. Ammonium carbonate and bicarbonate sludge (salts) formed in the Flare Stack and increased resistance to the gas flow path. The partial blockage increased the pressure at the Flare-Stack bottom and the sudden release of the gases gave vibrations (surging effects) to the Flare Stack. The Flare Stack was drained after unplugging the Stack-bottom drains. Hot-process gases (167°C) from the low temperature shift converter (LTS) outlet were lined up to the Flare Stack in small quantity to melt the deposits. Flare vibrations completely stopped after 3 days. Inspection of the weld joints and foundation bolts was done, and no abnormalities were found. No vibrations were observed during all normal/emergency plant shutdowns faced after the incident. The work describes the root cause of unique experience of Flare-Stack vibrations, and the way the problem was solved online. © 2010 American Institute of Chemical Engineers Process Saf Prog, 2010
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Self‐supported Flare‐Stack vibrations in ammonia plant
Process Safety Progress, 2010Co-Authors: Rob Stevens, Umesh R DesaiAbstract:Qatar Fertilizers Company (QAFCO), Ammonia-3 is a 1,500 metric tons per day (MTPD) plant, designed, supplied, and commissioned by a company (Division of Thyssen Krupp Group) (UHDE) in 1997. The main gas Flare Stack is a self-supported free-standing structure with a height of 70.5 m, located in the middle of the plant. Excessive vibrations/shaking of the Flare and Flare structure were observed due to mixing of NH3 and CO2 rich gases in the presence of water. Ammonium carbonate and bicarbonate sludge (salts) formed in the Flare Stack and increased resistance to the gas flow path. The partial blockage increased the pressure at the Flare-Stack bottom and the sudden release of the gases gave vibrations (surging effects) to the Flare Stack. The Flare Stack was drained after unplugging the Stack-bottom drains. Hot-process gases (167°C) from the low temperature shift converter (LTS) outlet were lined up to the Flare Stack in small quantity to melt the deposits. Flare vibrations completely stopped after 3 days. Inspection of the weld joints and foundation bolts was done, and no abnormalities were found. No vibrations were observed during all normal/emergency plant shutdowns faced after the incident. The work describes the root cause of unique experience of Flare-Stack vibrations, and the way the problem was solved online. © 2010 American Institute of Chemical Engineers Process Saf Prog, 2010
Junfei Qiao - One of the best experts on this subject based on the ideXlab platform.
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Vision-Based Monitoring of Flare Soot
IEEE Transactions on Instrumentation and Measurement, 2020Co-Authors: Ke Gu, Yonghui Zhang, Junfei QiaoAbstract:The Flare Stack is a typical Flare gas combustion facility used to guarantee the safe production of petrochemical plants, refineries, and other enterprises. One of the most vital problems of a Flare Stack is the incomplete combustion of Flare gas, which produces a large amount of Flare soot and, thus, endangers the atmosphere and human health. Hence, an effective and efficient Flare soot monitoring system that has important guiding significance to environmental protection is strongly required. To this end, we devise a vision-based monitor of Flare soot (VMFS) that can search for Flare soot in a timely way and ensure the full combustion of Flare gas. First, the proposed VMFS leverages the broadly tuned color channel to recognize a flame in an input video frame since the flame is the source of Flare soot in our application. Second, our monitor incorporates fast saliency detection with K-means to fix the position of the flame. Third, we take the flame area as the center to search for the potential Flare soot region, followed by identifying the Flare soot based on the background color channel. The results of experiments on multiple video sequences collected at a real petrochemical plant reveal that the proposed VMFS is superior to state-of-the-art relevant models in both monitoring performance and computational efficiency. The implementation code will soon be released at https://kegu.netlify.com/.
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Convolutional Neural Network for Smoke Image Super-Resolution
Proceedings of the 2nd International Conference on Computer Science and Application Engineering - CSAE '18, 2018Co-Authors: Ke Gu, Junfei QiaoAbstract:The1 Flare Stack is the last line of defense in the safe production of large-scale chemical plants. Monitoring black smoke produced by the incomplete Flare Stack exhaust combustion can effectively reduce environmental pollution and production accident. In order to improve the ability to recognition and analyze the black smoke, high-resolution Flare Stack scene images are in urgent need. To this end, we in this paper propose a super-resolution algorithm based on convolutional network that focuses only on smoke area for the purpose of identifying the smoke of Flare Stack. With a lightweight convolutional neural network structure, our network specializes in learning smoke characteristics mapping between the low-resolution images and the associated high-resolution. To verify validity, our algorithm compares the super-resolution quality of the smoky region of the Flare Stack image with several classic super-resolution algorithms. The experimental results show that our algorithm is superior to the classical algorithms when applied to smoke images.
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Ensemble Meta Learning for Few-Shot Soot Density Recognition
IEEE Transactions on Industrial Informatics, 1Co-Authors: Ke Gu, Yonghui Zhang, Junfei QiaoAbstract:In each petrochemical plant around the world, the Flare Stack as a requisite facility produces a large amount of soot due to the incomplete combustion of Flare gas, and this strongly endangers air quality and human health. Despite severe damage, the above-mentioned abnormal conditions rarely occur and thus only few-shot samples are available. To address such difficulty, we design an image-based Flare soot density recognition network (FSDR-Net) via a new ensemble meta-learning technology. More particularly, we first train a deep convolutional neural network (CNN) by applying the model-agnostic meta-learning algorithm on a variety of learning tasks that are relevant to the Flare soot recognition, so as to obtain the general-purpose optimized initial parameters (GOIP). Second, for the new task of recognizing the Flare soot density via only few-shot instances, a new ensemble is developed to selectively aggregate several predictions which are generated based on a wide range of learning rates and a small number of gradient steps. Results of experiments conducted on the density recognition of Flare soot corroborate the superiority of our proposed FSDR-Net as compared with the popular and state-of-the-art deep CNNs.
化钊 李 - One of the best experts on this subject based on the ideXlab platform.
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fem simulation on integral hoisting for 49 m flange connection Flare Stack structure
Metrologia, 2016Co-Authors: 化钊 李Abstract:法兰连接结构火炬塔架安装一般采用散件组装或分节吊装，由于施工条件苛刻本文提出一种法兰连接式火炬塔架一次性整体吊装技术方法的创新。使用CATIA有限元分析模拟火炬塔架整体吊装时的水平和竖直两个极限状态工况受力，对吊装时塔架的强度和稳定性进行校核计算，查找出危险点及提出薄弱结构的加固处理措施，为吊装工艺设计提供依据。 Knocked down assembly or segmentation hoisting is generally used for Flare Stack with flange connection structure. This paper presents a novel technology of integral hoisting of Flare Stack with flange connection structure. In the paper, CATIA finite-element-analysis is used to build the model of Flare Stack and to simulate working condition in both horizontal and vertical limit states during integral hoisting of Flare Stack. The strength and stability of Flare Stack during hoisting is checked and calculated. The dangerous points and weak structures are conducted through the reinforcement treatment to provide evidence for hoisting procedure design and formulation of hoisting plan.