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Jian C.,Sinochem Quanzhou Petrochemical Co.
Petroleum Refinery Engineering | Year: 2013

Salt will deposit on the blades of recycle hydrogen compressor of residue hydrogenation unit in the refinery after operation for a period of time, which will produce eccentric force and vibration on compressor rotor or even lead to shutdown of the compressor in serious case. An unscheduled shutdown of a centrifugal compressor in a 1. 5 MM TPY residue hydrogenation unit is introduced, and the causes of salt deposit on compressor are analyzed. Measures for preventing salt deposition in unit operation are presented, such as stabilizing reactor operation, application of stainless steel for equipment upstream of recycle hydrogen compressor, control and reduction of oxygen in desalted water, strict control of amount and temperature of amine liquid, timely cleaning of fouling in the equipment and pipelines upstream of recycle hydrogen compressor and good control of liquid level and interface of cold HP separator. Source

Ren G.-Q.,Sinochem Quanzhou Petrochemical Co. | Feng W.-X.,Sinochem Quanzhou Petrochemical Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2012

In order to shorten the start-up time of the residual oil hydrogenation plant during renewing the catalyst, the key influencing factors on start-up time are identified. The limitations elements in the elevating temperature and pressure process of the system are analyzed.The optimized method is given.After optimization, the start-up time can shorten 48 h. Source

He L.-N.,Sinochem Quanzhou Petrochemical Co. | Ge X.,Sinochem Quanzhou Petrochemical Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2013

For slide valve malfunction of the regenerated catalyst used in catalytic cracking unit, the slide valve malfunction phenomenon, analysis and the solution are given in this paper. Source

Jian C.,Sinochem Quanzhou Petrochemical Co.
Petroleum Refinery Engineering | Year: 2015

The causes of failure of magnetic level meter and differential pressure level meters for a hot high-pressure separator in a 3.3 MM TPY residue hydrotreating unit are analyzed through case study. The analysis indicates that the causes are high liquid level, demagnetization of magnetic float and failure of magnetic level meter, poor heat tracing of differential pressure level meter, and flushing hydrogen unused etc. Measures for the prevention of failure of liquid level meters of hot high-pressure separator are proposed such as application of unused flushing hydrogen, good insulation and heat tracing for level meters, scheduled inspection and testing of magnetic level meter, scheduled switching and testing of level control valve of hot high-pressure separator and stable operation. Source

Zheng Q.,Sinochem Quanzhou Petrochemical Co. | Mu Y.,Sinochem Quanzhou Petrochemical Co. | Chen X.,Sinochem Quanzhou Petrochemical Co.
Petroleum Processing and Petrochemicals | Year: 2015

The analysis indicates that the abnormal phenomena of quench tower, SO2 concentration in flue gas and hydrogenation system during the commissioning of No. 2 tail gas treatment system for sulfur recovery is due to the activity decline of the hydrogenation catalyst. It is found that the reason for hydrogenation activity losing is due to the bias current in catalyst bed. Effective measures are then adopted, including sealing part of the reactor entrance opening, adding porcelain ball screen mesh at the top of the catalyst bed and adjusting the operation of the reactor system. The bias current in the catalyst bed is thus controlled effectively and the hydrogenation activity improves significantly by these measures, resulting in smooth operation of the tail gas system of the sulfur recovery unit. © 2015, Research Institute of Petroleum Processing, SINOPEC. All rights reserved. Source

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