Descaling method of graphite for phospheric acid concentration

A heat exchanger and phosphoric acid concentration technology, which is used in the descaling field of graphite heat exchangers for phosphoric acid concentration, can solve the problems such as scaling of the phosphoric acid concentration heat exchanger that has not been seen, and achieves improved heat transfer efficiency, thorough cleaning, The effect of controlling corrosion

Active Publication Date: 2009-12-23
WENGFU (GRP) CO LTD +1
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  • Abstract
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Problems solved by technology

However, after searching, there are no literature reports that can efficiently clean the fouling of the phosphoric acid concentration heat exchanger.

Method used

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  • Descaling method of graphite for phospheric acid concentration

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Embodiment Construction

[0015] Example Take the phosphoric acid concentrated graphite heat exchanger cleaning and descaling technology of Guizhou Hongfu Industrial Development Co., Ltd. as an example. The company's phosphoric acid concentration adopts a typical vacuum forced circulation concentration process. Its main equipment includes graphite heat exchangers, evaporation chambers and circulation pumps. The annual production scale of phosphoric acid is 500,000 tons. Fouling in graphite heat exchangers is mainly caused by CaSO 4 and trace amounts of MgSO 4 and SiO 2 composition. Aiming at this fouling, a new cleaning solution was screened out, which successfully solved the technical problem of scaling and cleaning graphite heat exchangers, and the corrosion inhibition rate of 904L and CD4MCu stainless steel reached over 95%. The developed cleaning solution is a three-component system composed of dilute fluosilicic acid solution, organic phosphorus corrosion inhibitor and film-forming substance, o...

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Abstract

The invention discloses a method for decaling phosphoric acid concentration heat exchanger, namely a technique of adopting a washing-liquor composed of thin fluosilicic acid solution, organic phosphonic acid sustained-releasing agent and film forming matter and firstly washing the heat exchanger with water and then washing out the foul with the washing liquor. In the washing liquor, the fluosilicic acid is a 5%-20% thin acid, the organic phosphonic acid sustained-releasing agent includes amino tri- sub-methylene phosphoric acid, hydroxyl sub-ethyl di-phosphoric acid and hydroxyl-l, 1-subethyl di-phosphoric acid; the film forming matter includes nitrous phenylhydroxylamine ammonium salt and wuluotuopin as well as sodium molybdate. As using, adding in surface active agent alkyl sulphonate. The invention can make high efficiency and thorough decaling the graphite heat exchanger and simultaneously effectively control the corrosion of the washing liquor to the equipment and as compared with traditional washing methods, the invention improves the productivity of the equipment.

Description

technical field [0001] The invention relates to a method for removing fouling on the surface of materials, and also relates to the preparation of a cleaning solution and a slow-release agent thereof, in particular to a method for removing scale from a phosphoric acid concentration heat exchanger. Background technique [0002] Most of the dilute phosphoric acid concentration in the wet phosphoric acid production process uses graphite heat exchangers. In the process of concentrated phosphoric acid, a large amount of scale is formed on the inner wall of the heat exchanger equipment, and the scale on the inner wall of the graphite tube impregnated with phenolic resin is continuously thickened. The layer seriously affects the heat transfer effect of the graphite heat exchanger, resulting in a substantial decline in the concentrated production capacity of dilute phosphoric acid. The traditional descaling method uses a combination of high-pressure water gun cleaning and dilute sulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28G9/00C11D1/12C11D3/36
CPCC23F15/005C23F14/02
Inventor 曾祥钦郭仕伟梁巍谢燕刘海敖先权周仕飞姜庆泉刘荣吴斌
Owner WENGFU (GRP) CO LTD
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