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Device and method for treating waste residues of circulating make-up water by reutilizing lime softening method of power plant

A lime softening and processing cycle technology, applied in the field of waste residue devices, can solve problems such as waste of calcium carbonate resources, and achieve the effects of high environmental protection value, avoiding waste of resources and high desulfurization efficiency

Active Publication Date: 2013-04-03
CHINA RESOURCES POWER HENAN SHOUYANGSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the lime softening method used in the prior art will produce a large amount of waste residues. The existing technology generally adopts mud concentration, centrifugal dehydration and landfill treatment for the generated waste residues. However, this method has produced new secondary wastes. source of pollution, and will cause a huge waste of calcium carbonate resources

Method used

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  • Device and method for treating waste residues of circulating make-up water by reutilizing lime softening method of power plant
  • Device and method for treating waste residues of circulating make-up water by reutilizing lime softening method of power plant
  • Device and method for treating waste residues of circulating make-up water by reutilizing lime softening method of power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Inject urban reclaimed water into the mechanically accelerated clarifier with an injection volume of 600m 3 / h. At a temperature of 12°C and without flocculants and coagulants, calcium hydroxide is added to the mechanical acceleration clarifier through the lime metering system, and the amount of calcium hydroxide added with a purity of 85% per hour is 172Kg; after adding calcium hydroxide At the same time, use the pH meter to monitor the pH value of the solution in the mechanical accelerated clarification tank in real time. When the solution in the tank is greater than 10.3, reduce the addition of calcium hydroxide, mix it evenly and let it stand to complete the softening treatment of urban reclaimed water;

[0071] The softened water in the mechanically accelerated clarifier is discharged into the filter, and the sludge is discharged into the concentration tank through the sewage outlet, and settles for 4 hours to obtain waste residue;

[0072] The waste slag obtained ...

Embodiment 2

[0083] Inject domestic sewage into the mechanical accelerated clarification tank with an injection volume of 1300m 3 / h. At a temperature of 24°C and without flocculants and coagulants, calcium hydroxide is added to the mechanically accelerated clarifier through the lime metering system, and the amount of calcium hydroxide added with a purity of 85% per hour is 350Kg; after adding calcium hydroxide At the same time, use the pH meter to monitor the pH value of the solution in the mechanical accelerated clarification tank in real time. When the pH value of the solution in the tank is 10.3, stop adding calcium hydroxide, mix it evenly and let it stand to complete the softening treatment of urban reclaimed water;

[0084] The softened water in the mechanically accelerated clarifier is discharged into the filter, and the sludge is discharged into the concentration tank through the sewage outlet, and settles for 4 hours to obtain waste residue;

[0085] The waste slag obtained is t...

Embodiment 3

[0090] Inject the cooling tower sewage into the mechanical acceleration clarification tank, the injection volume is 1000m 3 / h. At a temperature of 15°C and without flocculants and coagulants, calcium hydroxide is added to the mechanical acceleration clarifier through the lime metering system, and the amount of calcium hydroxide added with a purity of 90% per hour is 200Kg; At the same time, the pH meter is used to monitor the pH value of the solution in the mechanical acceleration clarification tank in real time. When the pH value of the solution in the tank is 10.0, stop adding calcium hydroxide, mix well and let stand to complete the softening treatment of urban reclaimed water;

[0091] The softened water in the mechanically accelerated clarifier is discharged into the filter, and the sludge is discharged into the concentration tank through the sewage outlet, and settled for 5 hours to obtain waste residue;

[0092] The waste slag obtained is transported to the desulfuriz...

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Abstract

The invention provides a method for treating waste residues of circulating make-up water by reutilizing a lime softening method of a power plant. The method comprises the following steps of: a), mixing a circulating make-up water source with a pH value regulating agent for regulating the pH value of the circulating make-up water source to 9.9-10.3 on the condition of not adding a flocculant and a coagulant aid; and b), stewing the mixed solution with the pH value of 9.9-10.3 obtained in the step a) and using the obtained filter residue as a desulfurizing agent. According to the method provided by the invention, the flocculant and the coagulant aid are not added while the circulating make-up water is treated by the lime softening method, and the treated water also satisfies the water standard of the circulating make-up water; the obtained filter residue can form into dry solid gypsum, so that high desulfurizing efficiency can be achieved; and moreover, according to the method provided by the invention, the pH value of the circulating make-up water source is regulated to 9.9-10.3 by adopting the pH value regulating agent, so that the obtained filter residue can directly serve as the desulfurizing agent and has high desulfurizing efficiency.

Description

technical field [0001] The invention relates to the technical field of water softening treatment, in particular to a device and method for reusing water and lime in a power plant to soften and treat waste slag of circulating supplementary water. Background technique [0002] The water used for power plants comes from mine groundwater, urban reclaimed water, domestic sewage or industrial wastewater, which has high temporary hardness. The temporary hardness of the water will cause the dissolved scale-causing salts to crystallize and precipitate after reaching a supersaturated state in the system, thereby adhering Salt scale is formed on the surface of the heat exchanger and other places, including calcium carbonate, calcium sulfate, calcium silicate, etc., which will cause great harm to the equipment. In order to eliminate the temporary hardness of water used in power plants, there are mainly three methods to prevent calcium carbonate scaling in the prior art: lime softening m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 陈国利
Owner CHINA RESOURCES POWER HENAN SHOUYANGSHAN
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