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Separate collection, reuse and treatment method for SCR denitration catalyst cleaning wastewater

A denitration catalyst and a technology for cleaning wastewater, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of reduced reliability, high energy consumption, complicated devices, etc., and achieve simple wastewater treatment methods, and The effect of saving water

Active Publication Date: 2017-03-22
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are generally aimed at cleaning wastewater containing high concentrations of organic matter, and consume more energy during the treatment process; or the devices are more complicated, which reduces the reliability during use

Method used

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  • Separate collection, reuse and treatment method for SCR denitration catalyst cleaning wastewater
  • Separate collection, reuse and treatment method for SCR denitration catalyst cleaning wastewater
  • Separate collection, reuse and treatment method for SCR denitration catalyst cleaning wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] After the fifth cleaning tank 5 cleans 12 pieces of catalyst, it is recorded as time point 1, and the waste water is discharged into the left collection tank 21 of the second waste water collection tank, and then new desalted water is injected to continue the pipeline cleaning of the catalyst module. After the waste water in the left collection tank 21 of the second waste water collection tank was allowed to settle for 24 hours, the measured pH value of the supernatant was 5.9, and the turbidity was 13 NTU. After the fourth cleaning tank 4 cleans 24 pieces of catalysts, it is recorded as time point 2, waste water is discharged into the right collecting tank 22 of the second wastewater collecting tank, then the supernatant liquid injected into the left collecting tank 21 is reused, and the insufficient Part of it is supplemented with demineralized water, and the pipeline cleaning of the catalyst module is continued. After the waste water in the right collection tank 22 o...

Embodiment 2

[0048] After cleaning 20 pieces of catalysts in the first cleaning tank 1 and the second cleaning tank 2 , the waste water is discharged into the first waste water collection tank 6 . The measured wastewater pH value is 3.1, and the turbidity exceeds the instrument range (>1000NTU). Add an appropriate amount of sodium hydroxide to the first wastewater collection tank 6 and aerate for neutralization. After 2 hours of reaction, it was left to settle for 24 hours. The measured pH value of the supernatant was 8.6, and the turbidity was 113 NTU. Extract the supernatant and discharge it to the waste water continuous treatment device 9, add PAC and PAM online, the dosage of PAC is 800-1500ppm, and the dosage of PAM is 5-10ppm. Then after the subsequent inclined tube settling and filtration of fine sand and activated carbon, clean water is obtained. The pH value of the clear water is 8.3, the turbidity is 14, and the content of heavy metal elements is shown in Table 1.

[0049] Ta...

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Abstract

The invention provides a separate collection, reuse and treatment method for SCR denitration catalyst cleaning wastewater. An SCR denitration catalyst is cleaned with high-pressure water and in a first cleaning tank, a second cleaning tank, a third cleaning tank, a fourth cleaning tank and a fifth cleaning tank, and the wastewater is generated, wherein the wastewater of the first cleaning tank and the second cleaning tank is drained into a first wastewater collecting tank, the wastewater of the third cleaning tank, the fourth cleaning tank and the fifth cleaning tank is drained into a second wastewater collecting tank, after the wastewater in the second wastewater collecting tank is standing, supernatant is reused into the third cleaning tank or the fourth cleaning tank or the fifth cleaning tank, after the wastewater in the second waste water collecting tank is reused 5-7 times, the wastewater is reused in the first cleaning tank or the second cleaning tank, the wastewater in the first wastewater collecting tank is dosed, neutralized, precipitated and filtered, and clear water is obtained. The cleaning method on the basis of achieving SCR denitration catalyst cleaning aims at the cleaning process, collection, separate reuse and treatment of the wastewater are reasonably arranged, the wastewater treatment method is simple, reliable and efficient, and water resources are saved.

Description

technical field [0001] The invention specifically relates to a method for sorting, collecting, reusing and treating waste water from cleaning an SCR denitrification catalyst. Background technique [0002] With the promulgation of the country's latest "Environmental Standards for Air Pollutants in Thermal Power Plants GB13223-2011", most boilers in thermal power plants are equipped with SCR denitrification devices, and SCR catalysts are a key part of the operation of SCR devices. Due to the harsh operating conditions, the catalyst will gradually fail with the operation. At present, a large number of expired SCR catalysts have been produced and need to be replaced. Replacing the expired catalyst with a new catalyst will inevitably increase the cost of denitrification. An economical and effective method is to replace the expired catalyst. Cleanse to revitalize it. [0003] The invention patent with the authorization number CN101574671B discloses a SCR denitrification catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F9/00C02F2301/08C02F2201/007C02F2101/20C02F1/66C02F1/56C02F1/5245C02F1/281C02F1/001Y02P20/584
Inventor 张发捷孔凡海雷嗣远王丽朋卞子君
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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