Cleaning method of low-temperature multiple-effect seawater desalination evaporator

An evaporator and low-temperature technology, which is applied in the cleaning field of low-temperature multi-effect seawater desalination evaporators, can solve the problems of poor control, large consumption of chemicals, damage to heat transfer tubes, etc., and achieve good recovery and less chemical consumption.

Active Publication Date: 2009-12-30
SHOUGANG JINGTANG IRON & STEEL CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] Some current descaling methods often require mechanical or expensive chemical treatment to remove scale
The mechanical descaling method is too time-consuming and difficult to control, and because the heat transfer tubes in the low-temperature multi-effect seawater desalination evaporator are thin and thin, the descaling eff

Method used

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Embodiment

[0035] A large-scale low-temperature multi-effect seawater desalination plant, with a single set of water production of 12500m 3 / d, the heat transfer tube of the evaporator is made of copper alloy tube, and other parts are made of stainless steel. When operating at 100% load, the temperature of the final effect remains unchanged while the temperature of the concentrated brine of the first effect rises by 2°C, and the limit value of the maximum withstand temperature of the concentrated brine of the first effect is 66°C.

[0036] The company adopts the method of cleaning when the temperature of the concentrated brine in the first effect reaches its maximum tolerance temperature limit of 66°C. The cleaning steps are as follows:

[0037] A. Rinse with water: Remove the explosion-proof film of the evaporator to discharge the gas generated during the pickling process. Prepare an acid tank and place it near the acid connection on the suction side of the brine pump. For the seawat...

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Abstract

The invention relates to a cleaning method of a low-temperature multiple-effect seawater desalination evaporator, which belongs to the technical field of thermal seawater desalination. The method comprises the steps as follows: washing by water with the temperature being 20 to 30 DEG C and the flushing time being 30 to 60 minutes; carrying out precleaning by pre-cleaning liquid with the pre-cleaning time being 30 to 120 minutes; carrying out acid cleaning by pickling fluid containing pickling inhibitor with the acid cleaning time being 2 to 12 hours; adjusting pH value to 6.5 to 7.5 by alkali liquor; washing by water; carrying out passivation by passivating liquid with the passivation time being 2 to 12 hours. The method has the advantages that the performance of a low-temperature multiple-effect seawater desalination evaporator can be better recovered after the cleaning, and the method is economic, practical, simple and effective. The method is particularly applicable to the cleaning to low-temperature multiple-effect seawater desalination evaporators, and also applicable to the cleaning to heat exchangers and evaporators for seawater medium.

Description

technical field [0001] The invention belongs to the technical field of thermal seawater desalination, and in particular relates to a cleaning method for a low-temperature multi-effect seawater desalination evaporator, which is suitable for cleaning the low-temperature multi-effect seawater desalination evaporator. Background technique [0002] my country is one of the areas where water resources are seriously lacking, especially in its coastal areas. With the inevitable trend of heavy industry shifting to the sea, the problem of water shortage will become more prominent. Seawater desalination is the best way to get fresh water from the sea to solve the problem of water shortage. [0003] Commonly used seawater desalination methods are divided into two types: thermal method and membrane method, including thermal multistage flash distillation, low temperature multi-effect distillation and compressed steam distillation. Low-temperature multiple-effect distillation (abbreviated...

Claims

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Application Information

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IPC IPC(8): F28G9/00C23G1/04C23G1/24C23G1/06C23C22/48
Inventor 吴礼云李杨张建红马露露张波
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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