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On-line cleaning method

A centerline, particle technology, applied in the field of removing particles from the surface of heat exchangers, can solve the problems of expensive, economic loss of heat exchangers, increased costs, etc.

Inactive Publication Date: 2015-06-17
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Maintenance and replacement of failed heat exchangers can result in huge financial losses
In addition, the injected ammonium sulfate needs to be recovered as sulfuric acid, which is also an expensive and complicated process, further increasing the cost of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Said solid particles directed towards the wall of the heat exchanger are selected from the group consisting of dry ice and ice. For the purposes of the present invention, ice is defined as frozen water. The particle size ranges from about 5 millimeters to about 25 millimeters in diameter.

[0016] The gas flow used to accelerate the solid particles is selected from the group consisting of nitrogen and air. A key point in the practice of the invention is that the solid particles retain their shape while passing through the heat exchanger before contacting the walls in the heat exchanger. By maintaining its shape, it will be more efficient at knocking the particles out of the wall. The temperature of the reaction gas stream present in said heat exchanger is about 450°C at the inlet of the heat exchanger and about 200°C at the outlet of the heat exchanger. When the solid particles are dry ice, the solid particles should be produced under elevated pressure, from about 1 ...

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PUM

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Abstract

A method for removing particles from the surfaces of heat exchangers is disclosed. The particles are removed by directing a dry ice or ice particle through a nozzle using compressed gas against the surface of the heat exchanger to be treated.

Description

technical field [0001] The present invention relates to a method for removing particles from heat exchanger surfaces. Background technique [0002] Acrylonitrile is a key raw material used worldwide in the manufacture of chemicals. More than 90% of acrylonitrile plants use the Sohio process, in which acrylonitrile is made from propylene, ammonia and air over a fluidized bed catalyst. The reaction gas mixture leaving the reactor is precooled in tube-shell heat exchangers before being further processed. Because of catalyst wear, the reaction gas always carries some ultra-fine solid particles into the heat exchanger, and these particles will eventually deposit on the tube walls and eventually lead to performance degradation of the heat exchanger. As the plant continues to operate, the layer of solids deposited on the pipe walls will continue to grow. The permissible area for the passage of the reactant gases continues to decrease and undesirably leads to an increase in react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28G1/12
CPCF28G1/12F28G1/16
Inventor 肖剑邓云辉吴龙张辰东
Owner LINDE AG
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