Process for recycling ammonia-containing wastewater of drainage tank of thermal power plant unit

A technology for drainage tanks and thermal power plants, which is applied in water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as difficult treatment, reduce acid-base wastewater, reduce acid The amount of alkaline wastewater and the effect of avoiding ammonia volatilization

Inactive Publication Date: 2021-06-29
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, alkaline wastewater contains inorganic ammonia, which is difficult to treat. The existing industrial wastewater treatment system in thermal power plants does not have the function of treating inorganic ammonia. It can only be mixed with other wastewater and diluted for reuse in the plant.

Method used

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  • Process for recycling ammonia-containing wastewater of drainage tank of thermal power plant unit
  • Process for recycling ammonia-containing wastewater of drainage tank of thermal power plant unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] see figure 2 , in this embodiment, a process for recycling ammonia-containing wastewater in the drainage tank of a thermal power plant unit, the system includes a cation resin recovery tank 1, an acidic wastewater drainage ditch 2, an acidic wastewater delivery pump 3, an acidic wastewater collection pool 4, and an acidic wastewater level Meter 5, anion resin recovery tank 6, alkaline waste water drainage ditch 7, alkaline waste water delivery pump 8, alkaline waste water collection tank 9 and alkaline waste water level gauge 10; the outlet of positive resin recovery tank 1 is connected to acid waste water Drainage ditch 2, acid waste water drainage ditch 2 is connected to acid waste water collection pool 4, acid waste water collection pool 4 is connected to industrial waste water pool through acid waste water delivery pump 3, and acid waste water level gauge 5 is installed in acid waste water collection pool 4; The outlet of the resin recovery tank 6 is connected to t...

Embodiment 2

[0020] In a power plant in Hubei, the regenerated wastewater of the condensate polishing system is 3.6t / h, and the regenerated wastewater is directly discharged to the drainage tank of the unit. There is a large ammonia smell near the unit drainage tank for a long time, which has a great impact on the on-site operation and maintenance staff . At present, the power plant reuses this part of wastewater to the wet residue system, fuel system, dry ash mixing, etc. However, when it rains in summer, it is difficult to reuse this part of the wastewater, which affects environmental safety.

[0021] After the technical transformation of the present invention, the drainage tank of the unit is divided into an acidic wastewater pool and an alkaline wastewater pool, and a new alkaline wastewater drainage ditch is built to collect the alkaline wastewater separately and reuse it in the desulfurization system. After the transformation, the ammonia odor in the drainage tank of the unit was sig...

Embodiment 3

[0023] In a power plant in Heilongjiang, the regenerated wastewater of the condensate polishing system is 2t / h, and the regenerated wastewater is directly discharged to the unit drainage tank. There is a long-term ammonia smell near the unit drainage tank, which has a great impact on the on-site operation and maintenance staff. At present, the power plant reuses this part of wastewater to the fuel system, dry ash mixing, etc. With the closure of the coal yard, the fuel system cannot absorb so much acid-base wastewater, which has a great impact on environmental safety.

[0024] After the technical transformation of the present invention, the drainage tank of the unit is divided into an acidic wastewater pool and an alkaline wastewater pool, and a new alkaline wastewater drainage ditch is built to collect the alkaline wastewater separately and reuse it in the desulfurization system. After the transformation, the ammonia odor in the drainage tank of the unit was significantly redu...

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Abstract

The invention discloses a process for recycling ammonia-containing wastewater of a drainage tank of a thermal power plant unit. The process is suitable for all thermal power plant units with condensed water treatment systems and can separately collect acid-alkali wastewater regenerated by a condensed water fine treatment system, wherein the alkali wastewater mainly contains ammonia-containing wastewater. According to the process, after a drainage tank of a unit is divided into two parts, two alkaline wastewater conveying pumps and a remote liquid level meter are arranged, ammonia-containing alkaline wastewater is pressurized and conveyed to a desulfurization system for reuse, and the alkaline wastewater is neutralized by utilizing the acidity of desulfurization slurry, so that the aim of recycling all the alkaline wastewater is fulfilled, and the amount of acid-alkali wastewater of a condensate polishing system is reduced by 50%. The process can effectively reduce the amount of acid-alkali wastewater, and prevents the acid-alkali wastewater from being mixed in the unit drainage tank to generate harmful ammonia gas.

Description

technical field [0001] The invention relates to a recycling process of ammonia-containing waste water in the drain tank of a thermal power plant unit, which is applicable to all thermal power units with condensate treatment systems. Mainly ammonia-containing wastewater. Background technique [0002] The condensate polishing system of thermal power units usually adopts the "pre-filter + high-speed mixed bed" treatment process. When the conductivity of the mixed bed effluent reaches a critical value, the mixed bed needs to be regenerated, and the acid-base wastewater generated is discharged to the unit drainage tank. Due to the treatment process of adding ammonia to the feedwater of thermal power units, the regenerated alkaline wastewater contains ammonia. When the ammonia-containing alkaline wastewater and acid wastewater are discharged to the unit drainage tank at the same time, the acid-base neutralization reaction will cause ammonia gas to overflow, and there will usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/42C02F1/00
CPCC02F1/006C02F1/42C02F2001/425C02F2209/42
Inventor 唐国瑞赵建衡世权王丰吉王仁雷尤良洲晋银佳喻江李晶
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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