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Technology for recovering ash water of coal-fired power plant and system of sealing circulating for recovering thereof

A coal-fired power plant and circulation system technology, applied in water supply equipment, water supply equipment, descaling and water softening, etc., can solve the problems of ash conveying pipelines and return water pipelines, such as fouling and return water reuse rate, and achieve low cost, Strong operability and less dosage

Inactive Publication Date: 2006-09-13
NANJING TECH UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The ash water reuse process of coal-fired power plant and its closed circulation system of the present invention solve the problems of scaling of ash conveying pipelines and return water pipelines and low return water reuse rate in the prior art, and realize ash water recycling use and closed loop

Method used

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  • Technology for recovering ash water of coal-fired power plant and system of sealing circulating for recovering thereof
  • Technology for recovering ash water of coal-fired power plant and system of sealing circulating for recovering thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] like figure 1 and figure 2 In the ash water reuse process of coal-fired power plants and its closed circulation system, after washing, the ash water from the washing tower first enters the adjustment tank, then removes debris, and then settles, that is, before entering the concentration sedimentation tank Add 15mg of precipitant to the ash water, after complexation and sedimentation, the ash pump will transport the mortar to the ash field through the ash delivery pipe, and then separate the ash and water, that is, add 1-2mg / L polyacrylamide in the ash field for flocculation After settlement, the return water from the ash yard is pretreated first, that is, the backwater first enters the backwater pretreatment tank between the ash yard and the washing tower, and at the same time, 3mg of scale inhibitor and dispersant is added per liter of backwater, and the backwater Under the action of anti-scaling and dispersing agent, the return water is pumped to the washing tower f...

Embodiment 2

[0023] Precipitating agent and antiscaling and dispersing agent are prepared according to the following weight percentages:

[0024] Precipitating agent: sodium humate 18%, trisodium citrate 5%, lignosulfonate 7%, sodium carbonate 62%, sodium bicarbonate 4% and sodium hydroxide 4%.

[0025] Antiscalant dispersant: N-phosphonic acid-N-sulfonic acid-N'-dicarboxyethylenediamine 10%, 2-phosphonobutane-1,2,4-tricarboxylic acid 20%, acrylic acid , 2-acrylamido-2-methylpropanesulfonic acid, 2-hydroxy-2-phosphonoacetic acid and phosphonic acid tetrapolymer 40% and distilled water 30%.

[0026] The dosage of precipitant is 10mg / L, the dosage of antiscalant and dispersant is 2mg / L, the others are the same as Example 1, and will not be repeated. The results are shown in Table 1.

Embodiment 3

[0028] Precipitating agent and antiscaling and dispersing agent are prepared according to the following weight percentages:

[0029] Precipitating agent: sodium humate 16%, trisodium citrate 6%, lignosulfonate 8%, sodium carbonate 64%, sodium bicarbonate 3% and sodium hydroxide 3%.

[0030] Antiscalant dispersant: N-phosphonic acid-N-sulfonic acid-N'-dicarboxyethylenediamine 15%, 2-phosphonobutane-1,2,4-tricarboxylic acid 30%, made of acrylic acid , 2-acrylamido-2-methylpropanesulfonic acid, 2-hydroxy-2-phosphonoacetic acid and phosphonic acid tetrapolymer 30% and distilled water 25%.

[0031] The dosage of precipitant is 12mg / L, the dosage of antiscalant and dispersant is 1mg / L, and the washing device is a water film dust collector. Others are the same as in Example 1 and will not be repeated.

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Abstract

A closed-loop system and technology for reusing the ash-contained water in the power plant using coal as fuel includes such steps as washing, depositing, ash-water separation, adding the scale-inhibiting disperser to the water, washing to remove ash, adding pricipient, complexing for depositing, and ash-water separation.

Description

technical field [0001] The invention relates to a water recycling process and its circulation system, and more specifically relates to a coal-fired power plant ash water recycling process and its recycling closed circulation system. Background technique [0002] As a large water user, thermal power plants are the largest sector, accounting for about 1 / 4 of industrial water use, so water saving work in the power industry is extremely important. And accounting for about 90% of the total waste water is mainly ash removal and slag removal. Hydraulic ash removal, ie wet ash discharge, is the main ash removal method adopted by coal-fired power plants at home and abroad. The ash removal system includes ash flushing raw water system and ash flushing system. [0003] The main problem of hydraulic ash removal is that hard ash scale is easily formed on the inner wall of the pipeline during operation. As time goes by, the scale layer gradually thickens, resulting in a decrease in the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/52C02F5/12C02F5/00C02F9/02E03B1/00
Inventor 杨文忠唐永明王锦堂俞斌刘瑛尹晓爽殷鹏伟
Owner NANJING TECH UNIV
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