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Method for prolonging operation cycle of shell-and-tube heat exchanger

A tube-and-tube heat exchanger and operation cycle technology, applied in the field of applied chemical industry, can solve problems such as low production efficiency, reduce the possibility, reduce the contact time, and achieve the effect of continuous production

Inactive Publication Date: 2018-12-25
XINJIANG HUATAI HEAVY CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method to increase the operating cycle of the tube heat exchanger, reduce the probability of solution crystallization in the tube heat exchanger, enable the tube heat exchanger to be used for a long time, and avoid cleaning and crystallization resulting in low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, a method for improving the operating cycle of the tube-and-tube heat exchanger is to improve the surface accuracy of the inner surface of the tube-and-tube heat exchanger to reduce the probability of crystals produced by solution crystallization on the inner surface of the tube-and-tube heat exchanger, and Increase the circulation of the solution in the tube side of the tube heat exchanger during operation.

[0024] The shell and tube heat exchanger is currently the most widely used heat exchanger in chemical and alcohol production. When exchanging heat, the liquid that needs to be exchanged is made to flow from one end of the tube heat exchanger to the other end, and heat exchange is performed in the tube side of the tube heat exchanger. Under the current technical conditions, the inner surface of the tube-and-tube heat exchanger in contact with the solution will have more attachment points due to the influence of machining accuracy. During the cool...

Embodiment 2

[0027] On the basis of the above embodiments, in this embodiment, one of mechanical mirror polishing, grinding, fine milling, and fine turning is used to improve the surface accuracy of the inner surface of the tube-and-tube heat exchanger.

[0028] In this embodiment, the mechanical mirror polishing uses mechanical processing to process the inner surface of the tube heat exchanger to obtain a smooth inner surface, thereby reducing the possibility of crystallization on the inner surface of the tube heat exchanger being easily adhered and growing. attachment point. Specifically, a polishing wheel is used to polish the inner surface of the tube-and-tube heat exchanger.

[0029] The grinding uses a grinding wheel to process the inner surface of the tube-and-tube heat exchanger in a grinding manner to obtain an inner surface with high surface precision. and growth points of attachment.

[0030] The finishing milling uses milling to finish the inner surface of the tube-and-tube h...

Embodiment 3

[0036] On the basis of the above-mentioned Example 2, in this example, the circulating volume of the solution is increased to 1.5 times or more than 1.5 times on the original basis. By increasing the circulation volume, more solutions can pass through the tube heat exchanger per unit time, reducing the crystals precipitated from the solution per unit time, and reducing the contact time between the solution and the tube heat exchanger, thereby reducing the crystals precipitated Likelihood of contact with the attachment point.

[0037] Under the existing technical conditions, when the original circulation volume of the tube and tube heat exchanger is 300m3 / h, the circulation volume can be increased to 600m3 / h 3 / h, on the basis of making the surface roughness of the inner surface of the tube heat exchanger reach Ra0.5μm, the service life of the tube heat exchanger can be increased by 6 to 8 times. Taking sodium sulfate as an example, it can make the shell and tube heat exchange...

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Abstract

The invention discloses a method for prolonging the operation cycle of a shell-and-tube heat exchanger. The surface precision of the inner surface of the shell-and-tube heat exchanger is improved so as to reduce the probability that crystals produced through solution crystallization are attached to the inner surface of the shell-and-tube heat exchanger, and the circulation quantity of a solution in the tube pass of the shell-and-tube heat exchanger is improved during operation. The method has the beneficial effects that the probability that crystals are attached to the inner surface of the shell-and-tube heat exchanger can be reduced by improving the surface precision of the inner surface of the shell-and-tube heat exchanger, the contact time of the solution and the inner surface of the shell-and-tube heat exchanger is shortened by increasing the circulation quantity of the solution, and therefore the possibility that the crystals are attached to the inner surface of the shell-and-tubeheat exchanger is reduced. By means of the high-surface-precision inner surface of the shell-and-tube heat exchanger and the increased solution circulation quantity, attaching of the crystals to theinner surface of the shell-and-tube heat exchange can be slowed down or avoided, therefore, a crystallization layer is thickened to affect heat exchange, and therefore continuous production can be achieved.

Description

technical field [0001] The invention relates to the field of applied chemical industry, in particular, it is a method for improving the operation period of a tube-and-tube heat exchanger. Background technique [0002] In the application of chemical industry, the blockage of the tube side of the tube heat exchanger is always a problem in the industry, especially the solution with easy crystallization characteristics. Take sodium sulfate as an example: the tube side of the tube heat exchanger is a mixed solution of sodium sulfate crystals, and the shell side is steam. When the temperature of the mixed solution of sodium sulfate crystals is heated above 70°C, it is easy to crystallize and form Scale will eventually block the pipes and directly affect the heat exchange effect of the tube-and-tube heat exchanger. After 48 hours of operation, the operation can only be stopped, and the tube-and-tube heat exchanger is flushed so that the crystals can be continued to be used after f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/16
Inventor 陈家俊马斌陈建平刘宏孙健袁红林刘宇刘占山
Owner XINJIANG HUATAI HEAVY CHEM CO LTD
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