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A kind of online cleaning method of titanium plate heat exchanger

A heat exchanger and titanium plate technology, applied in the field of plate heat exchanger cleaning, can solve the problems of mechanical damage to plates, high cost, scaling on the surface of titanium materials, etc., and achieves simple equipment, easy purchase and simple operation. Effect

Active Publication Date: 2020-01-31
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if circulating water is used as the cooling medium, due to the presence of calcium and magnesium ions in the circulating water, scaling will still occur on the surface of the titanium material after a period of use, resulting in a decrease in the heat transfer effect of the heat exchanger
[0003] The more traditional cleaning method is to disassemble the heat exchanger and clean it one by one, but this method is time-consuming and labor-intensive, and it needs to be processed when the machine is shut down, and it is easy to cause mechanical damage to the plates during cleaning. Replacement of all sealing gaskets is expensive

Method used

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Embodiment

[0019] The titanium plate heat exchanger (BR0.62EW-0.6-27.28-E-1) of a chlor-alkali enterprise has serious scaling and poor heat transfer effect, which affects the safe and economical operation of the enterprise. If the traditional disassembly and cleaning is adopted, it needs to be shut down for processing, and once the system is shut down, it will cause a loss of at least 500,000 yuan when it is started up. Therefore adopted the inventive method to clean:

[0020] Step 1 Washing: add 1m in the dispensing box (1000*1000*1250) 3 water, then start the cleaning pump, and drain the remaining material after washing with water for 1.5 hours;

[0021] Step 2 pickling: first add 0.8m in the dispensing box 3 After calculation, add a certain amount of nitric acid and LAN-826 into the dispensing box and mix evenly, then take a sample to analyze whether the concentration of nitric acid is reached. If not, continue to add until the initial concentration reaches 10-12%. Start the clean...

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Abstract

The invention discloses an online cleaning method for a titanium plate-type heat exchanger and relates to the technical field of the cleaning of plate-type heat exchangers. The online cleaning methodcomprises the four steps of primary washing, pickling, mixed pickling and secondary washing in sequence; through the primary washing, pickling and mixed pickling steps, water, an acid solution and a mixed acid solution can correspondingly pass through the interior of the titanium plate-type heat exchanger; through the secondary washing step, water can pass through the interior of the titanium plate-type heat exchanger again; in the acid solution, the mass fraction of nitric acid is 10-12% and the mass fraction of a corrosion inhibitor LAN-826 is 0.25%; and in the mixed acid solution, the massfraction of nitric acid is 6-8%, the mass fraction of hydrochloric acid is 2.5-3% and the mass fraction of the corrosion inhibitor LAN-826 is 0.25%. The online cleaning method can be implemented in anonline manner and the influence on production can be avoided; the online cleaning method is simple and the corrosion to the titanium plate-type heat exchanger is relatively low; and dirt can be cleaned up, the heat transfer efficiency can be improved, and the relatively high economic value can be achieved.

Description

technical field [0001] The invention relates to the technical field of plate heat exchanger cleaning, in particular to an online cleaning method for a titanium plate heat exchanger. Background technique [0002] At present, the material of titanium plate heat exchanger is generally TA1-A. Under normal circumstances, a dense passivation film will be formed on its surface, the surface is smooth, the fouling coefficient is small, and the heat transfer efficiency is good. However, if circulating water is used as the cooling medium, due to the presence of calcium and magnesium ions in the circulating water, scaling will still occur on the surface of the titanium material after a period of use, resulting in a decrease in the heat exchange effect of the heat exchanger. [0003] The more traditional cleaning method is to disassemble the heat exchanger and clean it one by one, but this method is time-consuming and labor-intensive, and it needs to be processed when the machine is shu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28G9/00
CPCF28G9/00
Inventor 唐润兵王永明徐遵尚
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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