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Composite cleaning agent, preparation method thereof and method for treating evaporator scaling

A composite cleaning agent and evaporator technology, which is applied to cleaning methods and utensils, cleaning methods using liquids, preparation of detergent mixture compositions, etc. Long-term stable operation, etc., to avoid corrosion, good cleaning effect, and excellent cleaning efficiency

Pending Publication Date: 2022-03-11
HUANENG SHANDONG POWER GENERATION CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, multi-effect evaporators are commonly used to concentrate desulfurization wastewater. However, during the evaporation process, especially near the heat exchange tubes of the evaporator, fouling is most likely to occur, which affects the normal heat transfer of the heat exchange tubes, thus Affects the evaporation efficiency of the entire evaporator
[0004] When the desulfurization wastewater is concentrated, calcium-magnesium scale, calcium sulfate scale, and some organic / inorganic composite scales are usually formed. These scales are very stable in nature and structure after formation. Common cleaning agents are extremely difficult to deal with, and usually require a lot of manual work. And the recovery effect is poor, affecting the long-term stable operation of the evaporator

Method used

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  • Composite cleaning agent, preparation method thereof and method for treating evaporator scaling
  • Composite cleaning agent, preparation method thereof and method for treating evaporator scaling
  • Composite cleaning agent, preparation method thereof and method for treating evaporator scaling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Composite cleaning agent configuration: First configure 11% ethanol solution, then add 7% of the industrial pure Tween -20 in the case of continuous stirring, after the temperature is completely dissolved, add 12% EDTA, then add 11% of the sodium hexaalkylsulfonate, and then adjusted pH to 9.

[0043] (2) Evaporator circulation step cleaning: figure 1 As shown, the composite cleaning agent is first diluted 5 times, and 1 / 10 is added to the evaporator 1 according to the 1 / 10 of the evaporator 1 unit time, and the liquid discharged through the discharge port 4, passed through the evaporator circulation pump 2, through the evaporator 1 The inlet 6 is entered into the evaporator 1, and the cycle time is controlled to 1.5 h, and the recirculation pump 2 is stopped, and the cleaning liquid is discharged into the centrifuge 5 through the discharge port 4, and then the dilute 10 times the cleaning agent, add The volume is 1 / 10 of the evaporator treatment volume, and then opens ...

Embodiment 2

[0049] (1) Composite cleaning agent configuration: in Example 1

[0050] (2) Evaporator circulation step cleaning: step cleaning process is the same as in Example 1, the evaporator is a double-effect evaporator, and the average composition of the evaporator is shown in Table 2.

[0051] (3) Evaporator softening water rinsing: in Example 1

[0052] (4) Cleaning effect evaluation: Direct observation inside the evaporator, observing whether there is a visible scale of the naked eye, and after passing through the steam, investigate the relationship between the total heat transfer amount of steam and the amount of evapulmation wastewater in the unit time. The detection and heat transfer are shown in Table 2.

[0053] Table 2 detection and heat transfer

[0054]

Embodiment 3

[0056] (1) Composite cleaning agent configuration: in Example 1

[0057] (2) Evaporator circulation step cleaning: step cleaning process is the same as in Example 1, the evaporator is a double-effect evaporator, and the average composition of the evaporator is shown in Table 3.

[0058] (3) Evaporator softening water rinsing: in Example 1

[0059] (4) Cleaning effect evaluation: Direct observation inside the evaporator, observing whether there is a visible scale of the naked eye, and after passing through the steam, investigate the relationship between the total heat transfer amount of steam and the amount of evapulmation wastewater in the unit time. The detection and heat transfer are shown in Table 3.

[0060] Table 3 detection and heat transfer

[0061]

[0062] Through Example 1- Embodiment 3, the composite cleaning agent according to the present invention can be used for the treatment of evaporator fouling of different components, and the heat transfer effect of the evapora...

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Abstract

The invention relates to a composite cleaning agent, a preparation method thereof and a method for treating evaporator scaling. The cleaning agent is prepared from the following components in parts by weight: 5-12% of an ethanol solution, 10-18% of tween-20, 5-15% of ethylenediamine tetraacetic acid (EDTA), 5-15% of sodium hexadecyl sulfonate and the balance of a pH regulator, and the mass percentage of tween-20 to the ethanol solution is 5-12%, the mass percentage of ethylenediamine tetraacetic acid to the ethanol solution is 10-18%, and the mass percentage of sodium hexadecyl sulfonate to the ethanol solution is 5-15%. The mass concentration of the ethanol solution is 10-15%. After cleaning, no scale visible to the right eye exists, more steam is saved after cleaning, and energy conservation and consumption reduction are facilitated.

Description

Technical field [0001] The present invention belongs to the technical field of evaporator fouling treatment, and more particularly to a composite cleaning agent and a method of preparing a method thereof and a method of treating evaporator fouling. Background technique [0002] The information disclosed in the background is disclosed only to increase the understanding of the overall background of the present invention, and is not necessarily considered to admit or imply that the information is intended to be a prior art known to those skilled in the art. [0003] In the desulfurization wastewater zero emission engineering, it mainly includes pretreatment - concentrated reduction - final evaporation and other processes, the concentration reduction of desulfurization wastewater is a critical portion of the entire wastewater zero emissions. The current concentration of desulfurization wastewater is used to concentrate desulfurization wastewater using a multi-effect evaporator, but d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D1/83C11D3/04C11D3/20C11D3/33C11D3/60B08B3/08C02F1/04C02F103/18
CPCC11D1/83C11D3/201C11D3/33C11D3/044B08B3/08C02F1/04C02F1/048C02F2103/18C02F2303/14C11D1/14C11D1/667C11D2111/20
Inventor 曹红梅来连义庞莉王鹤吴中杰李杰郭明
Owner HUANENG SHANDONG POWER GENERATION CO LTD
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