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Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler

A technology for coal-fired boilers and flue gas treatment, applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of complex processes, high treatment costs, and high maintenance costs, and overcome differences and instability. performance, achieving near-zero emissions, and reducing up-front investment

Active Publication Date: 2013-07-24
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current wastewater treatment technology is mostly one or a combination of several of the above-mentioned unit technologies. The process is relatively complicated, the treatment cost is high, and the pertinence is strong. Once the amount and quality of wastewater change, the system will be difficult to operate reliably. Unstable quality is one of the characteristics of wastewater discharge
Therefore, the existing wastewater treatment technology is often difficult to carry out continuously in actual operation, the workload of equipment maintenance is heavy, and the maintenance cost is high
As a result, a large amount of waste water cannot be discharged up to the standard, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Use calcium hydroxide solution (milk of lime, mass concentration 10%~20%) to adjust the pH value of the power plant wastewater to 9, then use a 150-mesh filter to remove solid particles with a particle size greater than 100 microns in the power plant wastewater, and the filtrate is passed through the delivery pump It is transported to the single-phase flow atomizing nozzle arranged on the flue behind the air preheater, and is atomized into small droplets smaller than 100 microns through the atomizing nozzle. The temperature of the small droplets is 180°C and the dust content is 15 g / Nm 3 , The coal-fired boiler with a flow rate of 1000t / h is fully mixed with dust and flue gas. During this process, control the flow rate of treated wastewater to 10t / h.

[0014] Use the condensation method to cool and collect the moisture in the flue gas after the dust collector, and analyze the heavy metal ions, chloride ions and COD, etc. The results show that the quality of the wastewat...

Embodiment 2

[0018] Use magnesium hydroxide solution (mass concentration: 10%) to adjust the pH value of the power plant wastewater to 7, and use a 150-mesh filter to remove solid particles with a particle size greater than 100 microns in the power plant wastewater. The single-phase flow atomizing nozzle on the final flue is atomized into small droplets smaller than 100 microns through the atomizing nozzle. The temperature of the small droplets is 130°C and the dust content is 10 g / Nm 3 , The coal-fired boiler with a flow rate of 2000t / h is fully mixed with dust and flue gas. During this process, control the flow rate of treated wastewater to 2t / h.

[0019] Use the condensation method to cool and collect the moisture in the flue gas after the dust collector and analyze the heavy metal ions, chloride ions and COD, etc. The results show that the quality of the wastewater effluent after the treatment of the dusty flue gas of the coal-fired boiler is better than that stipulated by the State En...

Embodiment 3

[0023] Use ammonia water (mass concentration 5%) to adjust the pH value of the wet desulfurization wastewater to 8, use a 150-mesh filter to remove solid particles with a particle size greater than 100 microns in the wet desulfurization wastewater, and transfer the filtrate to the air preheater through a delivery pump. The gas-liquid two-phase flow atomizing nozzle on the final flue is atomized into small droplets of 100 microns through the atomizing nozzle. The temperature of the small droplets is 145°C and the dust content is 50 g / Nm 3 , The coal-fired boiler with a flow rate of 2000t / h is fully mixed with dust and flue gas. During this process, the flow rate of wet desulfurization wastewater is controlled to be 10t / h.

[0024] Use the condensation method to cool and collect the moisture in the flue gas after the dust collector and analyze the heavy metal ions, chloride ions and COD, etc. The results show that the quality of the wastewater effluent after the treatment of the...

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Abstract

The invention discloses a method for treating waste water by utilizing dust-containing smoke gas of a coal-fired boiler. The method comprises the following steps of: filtering waste water; atomizing the filtered waste water into small liquid particles with particle size being less than or equal to 100 microns; and mixing with the dust-containing smoke gas of the coal-fired boiler, wherein the mass flow ratio of the waste water to the dust-containing smoke gas of the coal-fired boiler is less than or equal to 1 / 100, the temperature of the dust-containing smoke gas of the coal-fired boiler is 130 to 180 DEG C, and the smoke dust content of the dust-containing smoke gas is 10 g / Nm<3> to 50 g / Nm<3>. The method is simple; equipment is convenient; the earlier-stage investment of a waste water treatment system is reduced; the operating cost of the traditional treatment method is reduced; the problem of differential treatment caused by difference and instability of waste water discharge is overcome; near zero emission of the waste water is realized; the afterheat of the smoke gas is utilized; and the actual requirements of energy conservation and environmental protection are met.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for treating waste water by utilizing the dusty flue gas of a coal-fired boiler. Background technique [0002] Wastewater treatment unit technologies include: ① Biological treatment technology, including activated sludge method, anaerobic method, biofilm method, etc.; ② Physical separation technology, mainly including technical processes such as sedimentation, clarification, air flotation, filtration and mechanical separation; ③ Physical separation technology. Chemical treatment technology mainly includes electrodialysis, reverse osmosis, ultrafiltration, ion exchange, coagulation, chemical oxidation, activated carbon and other technologies; ④ Chemical agent treatment technology mainly uses flocculation treatment technology using inorganic flocculants and organic polymer flocculants . [0003] The current wastewater treatment technology is most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/00B01D47/06C02F103/28
Inventor 汪永威郭静娟董雪峰周晓湘吴文龙
Owner STATE GRID CORP OF CHINA
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