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Cleaning method of simple substance copper scales

A technology of copper scale and single substance, which is applied in the field of chemical cleaning of boilers in thermal power plants, can solve problems such as poor removal of copper scale, achieve the effect of eliminating hidden dangers and ensuring safe production

Active Publication Date: 2013-07-17
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for cleaning simple copper scale to solve the problem that the current descaling method is not effective in removing copper scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The pharmaceutical raw materials used in each step are all in mass fraction:

[0039] (1) For the first copper removal, mix and wash with the following pharmaceutical raw materials for 3 hours,

[0040] Water: 96kg;

[0041] Ammonium persulfate: 1.0kg;

[0042] Sodium hexametaphosphate: 0.2kg;

[0043] Sodium fluoride: 0.1kg;

[0044] (2) For the first pickling, mix with the following medicament raw materials and wash for 7 hours; then rinse with water for 1 hour;

[0045] Water: 95kg;

[0046] 36% hydrochloric acid, ρ is 1.18g / ml: 4kg;

[0047] IS156 corrosion inhibitor: 0.2kg;

[0048] (3) For the second copper removal, after mixing with the following pharmaceutical raw materials, wash for 1 hour;

[0049] Water: 98kg;

[0050] Ammonium persulfate: 0.2kg;

[0051] 25% ammonia water, ρ is 0.90g / ml: 0.5kg;

[0052] Sodium hexametaphosphate: 0.1kg;

[0053] Sodium fluoride: 0.1kg;

[0054] (4) For the second pickling, mix with the following pharmaceutical raw...

Embodiment 2

[0064] The pharmaceutical raw materials used in each step are all in mass fraction:

[0065] (1) For the first copper removal, mix and wash with the following pharmaceutical raw materials for 4 hours,

[0066] Water: 97kg;

[0067] Ammonium persulfate: 1.5kg;

[0068] Sodium hexametaphosphate: 0.35kg;

[0069] Sodium fluoride: 0.2kg;

[0070] (2) For the first pickling, mix with the following pharmaceutical raw materials, wash for 8 hours, and rinse with water for 2 hours;

[0071] Water: 95.5kg;

[0072] 37% hydrochloric acid, ρ is 1.18g / ml: 4.5kg;

[0073] IS156 corrosion inhibitor: 0.25kg;

[0074] (3) For the second copper removal, after mixing with the following pharmaceutical raw materials, wash for 2 hours;

[0075] Water: 98.5kg;

[0076] Ammonium persulfate: 0.35kg;

[0077] 27% ammonia water, ρ is 0.88g / ml: 0.75kg;

[0078] Sodium hexametaphosphate: 0.2kg;

[0079] Sodium fluoride: 0.2kg;

[0080] (4) For the second pickling, after mixing the following phar...

Embodiment 3

[0090] The pharmaceutical raw materials used in each step are all in mass fraction:

[0091] (1) For the first copper removal, mix and wash with the following pharmaceutical raw materials for 5 hours,

[0092] Water: 98kg;

[0093] Ammonium persulfate: 2.0kg;

[0094] Sodium hexametaphosphate: 0.5kg;

[0095] Sodium fluoride: 0.3kg;

[0096] (2) For the first pickling, mix with the following pharmaceutical raw materials, wash for 9 hours, and then rinse with water for 3 hours;

[0097] Water: 96kg;

[0098] 38% hydrochloric acid, ρ is 1.19 g / ml: 5kg;

[0099] IS156 corrosion inhibitor: 0.3kg;

[0100] (3) For the second copper removal, after mixing with the following pharmaceutical raw materials, wash for 3 hours;

[0101] Water: 99kg;

[0102] Ammonium persulfate: 0.5kg;

[0103] 28% ammonia water, ρ is 0.88 g / ml: 1.0kg;

[0104] Sodium hexametaphosphate: 0.3kg;

[0105] Sodium fluoride: 0.3kg;

[0106] (4) For the second pickling, mix with the following pharmaceu...

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PUM

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Abstract

The invention relates to a cleaning method of simple substance copper scales, belonging to the field of chemical cleaning of boilers in fuel electric plants. The method comprises the following steps: (1) primary copper removal; (2) primary acid cleaning; (3) secondary copper removal; (4) secondary acid cleaning; and (5) tertiary cleaning, wherein the reagent raw materials used in the steps are metered in percentage by mass. The invention thoroughly solves the problem of simple substance copper scale removal. By using the method, the scale removal rate is up to more than 99%; and the inventionensures the safety in production, and does not have hidden danger.

Description

technical field [0001] The invention belongs to the field of chemical cleaning of boilers in thermal power plants. Background technique [0002] According to the DL / T794-2001 "Guidelines for Chemical Cleaning of Boilers in Thermal Power Plants": for drum boilers that have been put into operation, if the content of copper oxide in the scale is high, copper removal should be considered, and the following methods can be adopted: [0003] 1) Ammonia washing to remove copper: use NH after washing with HCl 3 ·H 2 O 1.3%~1.5% and (NH 4 ) 2 S 2 o 8 0.5% cleaning. [0004] 2) One-step method of cleaning thiourea with hydrochloric acid: HCl 4%~7%+(NH 2 ) 2 CS 0.5%+NaF0.5%~0.6%. [0005] 3) Slightly acidic copper removal: After the hydrochloric acid pickling water is qualified, the H 3 C 6 h 5 o 7 0.2%~0.3% +0.05% corrosion inhibitor + NaNO 2 1.0%~2.0%. [0006] 4) One-step mixed cleaning for descaling and passivation: a variety of inorganic and organic chemical agents...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/10
Inventor 郭慧王久生
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD
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