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Method for purifying salt-containing wastewater in waste incineration fly ash process

A technology for waste incineration fly ash and salty wastewater, applied in chemical instruments and methods, descaling and water softening, water/sewage treatment, etc., can solve problems such as affecting production efficiency, small crystallizer, large evaporator, etc. , to achieve the effect of inhibiting corrosion, reducing operating costs, and sufficient elastic margin

Active Publication Date: 2020-06-12
浙江红狮环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional brine-containing purification process has the problems of large evaporator, small crystallizer, easy scaling, and high failure rate in the evaporation crystallization system, which affects production efficiency

Method used

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  • Method for purifying salt-containing wastewater in waste incineration fly ash process
  • Method for purifying salt-containing wastewater in waste incineration fly ash process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for purifying saline waste water from waste incineration fly ash process, the specific scheme is as follows:

[0027] Pass the brine into the aeration tank with carbon dioxide, adjust the pH value of the brine to 8, then add 0.1% liquid caustic soda, then preheat the brine to 60°C, add 0.05% scale inhibitor, and then preheat the brine The heated brine is pumped into the forced circulation evaporator, and the compressed secondary steam is used to heat it, and the solution begins to evaporate and concentrate; after the evaporation reaches 50%, it is transferred to the secondary falling film evaporator, and the compressed secondary steam is used again. The steam heats the solution, and the solution continues to evaporate and concentrate to 22%; the evaporation temperature of the first-stage forced circulation evaporation concentration part is 86°C; the effective temperature difference is 6°C; the vacuum degree is 0.08MPa; the second-stage falling film evaporation c...

Embodiment 2

[0037] A method for purifying saline waste water from waste incineration fly ash process, the specific scheme is as follows:

[0038]Pass the brine into the aeration tank with carbon dioxide, adjust the pH value of the brine to 9, then add 0.3% liquid caustic soda, then preheat the brine to 70°C, add 0.07% scale inhibitor, and then preheat the brine The heated brine is pumped into the forced circulation evaporator, and the compressed secondary steam is used to heat it, and the solution begins to evaporate and concentrate; after evaporating to 55%, it is transferred to the secondary falling film evaporator, and the compressed secondary steam is used again. The steam heats the solution, and the solution continues to evaporate and concentrate to 26%; the evaporation temperature of the first-stage forced circulation evaporation concentration part is 91°C; the effective temperature difference is 8°C; the vacuum degree is 0.09MPa; the second-stage falling film evaporation crystalliza...

Embodiment 3

[0048] A method for purifying saline waste water from waste incineration fly ash process, the specific scheme is as follows:

[0049] Pass the brine into the aeration tank with carbon dioxide, adjust the pH value of the brine to 10, then add 0.5% liquid caustic soda, then preheat the brine to 80°C, add 0.08% scale inhibitor, and then preheat the brine The heated brine is pumped into the forced circulation evaporator, and the compressed secondary steam is used to heat it, and the solution begins to evaporate and concentrate; after evaporating to 65%, it is transferred to the secondary falling film evaporator, and the compressed secondary steam is used again. The steam heats the solution, and the solution continues to evaporate and concentrate to 29%; the evaporation temperature of the first-stage forced circulation evaporation concentration part is 94°C; the effective temperature difference is 12°C; the vacuum degree is 0.1MPa; the second-stage falling film evaporation crystalli...

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Abstract

The invention relates to the field of environmental protection, and concretely relates to a method for purifying salt-containing wastewater in a waste incineration fly ash process. According to the method, a scale inhibitor and an ultrasonic scale prevention technology are combined, the scaling problem of an evaporator is solved, carbon dioxide is used for replacing sodium carbonate, pH is adjusted, liquid caustic soda is used in cooperation with transformation of a horizontal screw centrifuge to properly adjust an existing water treatment system, and it is guaranteed that the inflow water quality of a distillation unit is in a controllable state. In addition, two-stage distillation operation is adopted, the sizes of the evaporator and the crystallizer are adjusted, and the problems that an existing evaporative crystallization system is large in evaporator size, small in crystallizer size, prone to scaling and high in failure rate are solved. The designed elastic allowance is sufficient, the system adjustability is good, and it is ensured that equipment can continuously and stably operate under the condition that the feeding concentration and the feeding amount fluctuate. The method for purifying the salt-containing water has the characteristics of controllability, adjustability and easiness in operation.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for purifying saline waste water in a waste incineration fly ash process. Background technique [0002] A large amount of fly ash will be produced in the process of incineration of garbage, and these fly ash of garbage incineration cannot enter the atmosphere without treatment. [0003] CN101049533A discloses a method for treating waste incineration fly ash, which is characterized in that it includes the following steps: (1) adding water to incineration fly ash to form an ash / water mixed system. (2) Add the inorganic agent solution into the ash / water mixed system and stir evenly, so that the inorganic agent reacts with the heavy ions in the fly ash to form a stable compound. (3) Control the pH value of the above-mentioned ash / water mixing system between 8 and 11.5. (4) After filtering out excess water in the ash / water mixing system, add cement to mix and make mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/66C02F1/08C02F1/04C02F1/36C02F1/042C02F2303/22C02F5/12
Inventor 黄学慧唐柯黄敏锐李春萍郭晓露陈慧斌
Owner 浙江红狮环保股份有限公司
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