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Chemical scale removing method for evaporator

An evaporator and chemical technology, which is applied in the field of chemical descaling of evaporators, can solve the problems of insufficient cleaning, time-consuming and labor-intensive, and scaling of three-effect evaporators, so as to avoid heat dissipation problems, reduce descaling time, and shorten cleaning time. The effect of the fouling cycle

Pending Publication Date: 2022-06-07
江西东江环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Three-effect evaporators and single-steamers will have fouling after a period of use, seriously affecting normal production and operation
[0005] (1) Time-consuming and labor-intensive, the operation time of cleaning the scale and passing the pipe is about 2 days, and the labor intensity is high;
[0006] (2) Cause irreversible damage to the evaporator tubes and reduce the service life of the equipment;
[0007] (3) The damage causes the inner wall to be rough and uneven, and the cleaning is not thorough enough, which makes the scaling easier to grow;
[0008] (4) A professional construction team needs to be paid, and the overall cost of cleaning is high

Method used

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  • Chemical scale removing method for evaporator
  • Chemical scale removing method for evaporator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The evaporator cleaning process can be summarized as the following steps:

[0058] (1) prepare the sodium carbonate solution of 20wt% concentration in proportion in the dispensing tank, and heat the lye to 60 ℃ by steam; prepare the nitric acid solution of 10wt% concentration at normal temperature (25 ℃) in the acid dispensing tank;

[0059](2) The sodium carbonate solution is pumped into the first-effect, second-effect, and third-effect separators respectively through three feed pumps, and circulating cleaning is carried out separately in the three evaporation systems, and the cleaning temperature is controlled at 65 ° C, and the cleaning The sodium carbonate solution used during cleaning accounts for 55% of the volume of the cleaning container;

[0060] (3) After 30min of circulation, the sodium carbonate solution in the triple-effect evaporator is simultaneously discharged into the lye filter tank for filtration through the discharge pipe, and the filtrate is returne...

Embodiment 2

[0065] The evaporator cleaning process can be summarized as the following steps:

[0066] (1) the sodium carbonate solution of 15wt% concentration is prepared in proportion in the dispensing tank, and the lye is heated to 60 ℃ by steam; the nitric acid solution of 3wt% concentration is prepared at normal temperature (25 ℃) in the acid dispensing tank;

[0067] (2) The sodium carbonate solution is pumped into the first-effect, second-effect, and third-effect separators respectively through three feed pumps, and circulating cleaning is carried out separately in the three evaporation systems, and the cleaning temperature is controlled at 70 ° C, and the cleaning The sodium carbonate solution used during cleaning accounts for 60% of the volume of the cleaning container;

[0068] (3) After 30min of circulation, the sodium carbonate solution in the triple-effect evaporator is simultaneously discharged into the lye filter tank for filtration through the discharge pipe, and the filtra...

Embodiment 3

[0073] The evaporator cleaning process can be summarized as the following steps:

[0074] (1) prepare the sodium carbonate solution of 25wt% concentration in proportion in the dispensing tank, and heat the lye to 70 ℃ by steam; prepare the nitric acid solution of 6wt% concentration at normal temperature (25 ℃) in the acid dispensing tank;

[0075] (2) The sodium carbonate solution is pumped into the first-effect, second-effect, and third-effect separators respectively through three feed pumps, and circulating cleaning is carried out separately in the three evaporation systems, and the cleaning temperature is controlled at 75 ° C, and the cleaning The sodium carbonate solution used during cleaning accounts for 65% of the volume of the cleaning container;

[0076] (3) After 30min of circulation, the sodium carbonate solution in the triple-effect evaporator is simultaneously discharged into the lye filter tank for filtration through the discharge pipe, and the filtrate is returne...

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Abstract

The invention discloses a chemical scale cleaning method for an evaporator, and relates to the field of environmental protection, a sodium carbonate solution and evaporator scales react under a medium temperature condition, insoluble calcium sulfate in the scales is converted into calcium carbonate, then an acid solution and the generated calcium carbonate react to generate soluble calcium salt, and the scales react and are stripped layer by layer, so that the scale cleaning effect is improved. Scale in the evaporator can be effectively removed.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for chemical cleaning of evaporators. Background technique [0002] The three-effect evaporator and single-steaming kettle will have scaling phenomenon after a period of use, which will seriously affect the normal production and operation. It was confirmed by sampling, detection and analysis that the main component of the scale layer of the 2t / h triple-effect evaporator and the single-steaming kettle was calcium sulfate. The formation of scaling should be that the water to be evaporated contains an appropriate amount of calcium and a large amount of sulfate ions, resulting in the continuous accumulation of calcium sulfate and the formation of a dense scale layer. When the calcium sulfate scale accumulates to a certain thickness, the evaporation efficiency will decrease and the energy consumption will increase. [0003] The existing treatment method is to disasse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28G9/00
CPCF28G9/00F28G15/00F28G15/003F28C3/08F28F21/086F28G2015/006Y02P20/10
Inventor 周朝锋陈浩张伟伟周宇强冷宝玲杜新亮
Owner 江西东江环保技术有限公司
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