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Method for reducing corrosion of chimney of FCC (fluid catalytic cracking) flue gas desulfurization device

A desulfurization device and chimney technology, applied in the chemical industry, can solve the problems of difficult maintenance of the anti-corrosion coating and high cost of replacing materials, and achieve the effects of low cost, simple operation and easy realization.

Inactive Publication Date: 2016-12-07
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for slowing down the corrosion of the chimney of the FCC flue gas desulfurization device. The method solves the problem of difficult maintenance of the anti-corrosion layer and the high cost of replacing materials

Method used

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  • Method for reducing corrosion of chimney of FCC (fluid catalytic cracking) flue gas desulfurization device
  • Method for reducing corrosion of chimney of FCC (fluid catalytic cracking) flue gas desulfurization device

Examples

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Embodiment 1

[0046] The washing device used in this example is as figure 1 As shown, the lye from the washing liquid pipeline 1 is mixed with the water from the water pipeline 2 and then enters the chimney. groove. The specific process is as follows.

[0047] The catalytic cracking flue gas desulfurization unit of a refinery adopts EDV wet scrubbing technology. The material of the chimney part of the cylinder is Q345R+S30403. The device has been in operation for about one year, and the upper cylinder of the chimney is found to be corroded and perforated. The flue gas flow rate of the scrubber is 170502Nm 3 / h (wet basis), the inner diameter of the chimney is 2300mm. During the maintenance period of the device, the chimney will be replaced as a whole, and the material will not change.

[0048] Adopt method described in the present invention, inject the caustic soda solution of 50 ℃ at the chimney top, control pH to be about 9, control the flow of chimney top washing liquid to be 2~3m 3...

Embodiment 2

[0052] The catalytic cracking flue gas desulfurization unit of a refinery adopts EDV wet scrubbing technology. The material of the chimney part of the cylinder is Q345R+S30403. The device has been in operation for about one year, and the upper cylinder of the chimney is found to be corroded and perforated. The flue gas flow rate of the scrubber is 170502Nm 3 / h (wet basis), the inner diameter of the chimney is 2300mm. During the maintenance period of the device, the chimney will be replaced as a whole, and the material will not change.

[0053] Adopt method described in the present invention, inject the caustic soda solution of 50 ℃ at the chimney top, control pH to be about 9, control the flow of chimney top washing liquid to be 2~3m 3 / h, a 4-5 mm water film is formed on the inner wall of the chimney, and the washing liquid flowing down the inner wall of the chimney is collected into the recirculation tank of the filter module. After one month of operation, the annual cost...

Embodiment 3

[0055] The catalytic cracking flue gas desulfurization unit of a refinery adopts EDV wet scrubbing technology. The material of the chimney part of the cylinder is Q345R+S30403. The device has been in operation for about one year, and the upper cylinder of the chimney is found to be corroded and perforated. The flue gas flow rate of the scrubber is 170502Nm 3 / h (wet basis), the inner diameter of the chimney is 2300mm. During the maintenance period of the device, the chimney will be replaced as a whole, and the material will not change.

[0056] Adopt method described in the present invention, inject the caustic soda solution of 50 ℃ at the chimney top, control pH to be about 9, control the flow of chimney top washing liquid to be 2~3m 3 / h, a 2-3 mm water film is formed on the inner wall of the chimney, and the washing liquid flowing down the inner wall of the chimney is collected into the recirculation tank of the filter module. After one month of operation, the annual cost...

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Abstract

The invention provides a method for reducing corrosion of a chimney of an FCC (fluid catalytic cracking) flue gas desulfurization device. According to the method for reducing corrosion of the chimney of the FCC flue gas desulfurization device, the smoke discharge chimney of the desulfurization device is washed with a washing solution, and a 1-5 mm liquid film is formed on the inner wall of the chimney; the washing solution is an alkaline solution. By means of the method, the problems of high maintaining difficulty due to application of an anticorrosive coating and high material replacement cost are solved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for slowing down the corrosion of the chimney of an FCC flue gas desulfurization device. Background technique [0002] With the country's higher and higher requirements for energy saving and emission reduction and the implementation of the new "Petroleum Refining Industry Pollutant Discharge Standards", the SO contained in catalytic cracking (FCC) flue gas X , NO X And the removal and treatment of particulate matter has become an important environmental protection topic in the oil refining industry. For this reason, most domestic refineries have built flue gas purification devices mainly for desulfurization, denitrification and dust removal. However, with the prolongation of operation time, the leakage and downtime of flue gas desulfurization units due to corrosion problems have gradually increased, especially the corrosion of chimneys has attracted much atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/40B01D53/96
CPCB01D53/40B01D53/78B01D53/96B01D2251/304B01D2251/404B01D2251/602B01D2251/604B01D2251/2062B01D2251/606B01D2258/0283
Inventor 崔新安于凤昌刘希武许兰飞李朝法李晓炜刘旭霞
Owner SINOPEC ENG GRP CO LTD
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