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Wet desulphurization wastewater softening system based on air-lifting type circulating reactors and wet desulphurization wastewater softening method based on air-lifting type circulating reactors

A loop reactor, wet desulfurization technology, applied in chemical instruments and methods, gaseous effluent wastewater treatment, water/sewage treatment, etc., can solve the problems of increasing difficulty, large softener, large amount of sludge, etc., and achieve recycling Utilization, reduced operating costs, and efficient softening effects

Inactive Publication Date: 2017-07-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method consumes a large amount of softener, which not only increases the consumption cost of the power plant, but also produces a large amount of sludge during the desulfurization wastewater treatment process, increasing the difficulty of subsequent treatment

Method used

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  • Wet desulphurization wastewater softening system based on air-lifting type circulating reactors and wet desulphurization wastewater softening method based on air-lifting type circulating reactors
  • Wet desulphurization wastewater softening system based on air-lifting type circulating reactors and wet desulphurization wastewater softening method based on air-lifting type circulating reactors

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Experimental program
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Effect test

Embodiment 1

[0032] Adopt above-mentioned system and method to initial magnesium hardness and calcium hardness (as CaCO 3 Total) 20000mg / L, 6525mg / L of water is 15m 3 / h Desulfurization waste water A is softened, and the top inner wall of the external cylinder reactor is equipped with annularly distributed pressure nozzles. The height-to-diameter ratio of the two-stage air-lift loop reactor is 10. A waste water cyclone and a fiber filter are set before the second-stage airlift loop reactor. In the magnesium removal process, the selected alkaline softener is NaOH, and the alkali amount is 264kg / h (OH — / Mg 2+ The molar ratio is 2.2), and the reaction is carried out at superficial gas velocity and circulating liquid velocity of 0.03m / s and 5.07m / s; decalcification process, CO 2 It comes from the flue gas after desulfurization and denitrification, the content is 16%, the reaction is carried out at the superficial gas velocity of 0.01m / s, 3.36m / s, and the circulating liquid velocity, and th...

Embodiment 2

[0034] Adopt above-mentioned system and method to initial magnesium hardness and calcium hardness (as CaCO 3 Total) 14417mg / L, 10000mg / L of water is 20m 3 / h Desulfurization waste water B is softened, and the top inner wall of the external cylinder reactor is equipped with annularly distributed pressure nozzles. The height-to-diameter ratio of the two-stage air-lift loop reactor is 14. A waste water cyclone and a fiber filter are set before the second-stage airlift loop reactor. In the magnesium removal process, the selected alkaline softener is NaOH, and the alkali amount is 277kg / h (OH — / Mg 2+ The molar ratio is 2.4), and the reaction is carried out at superficial gas velocity and circulating liquid velocity of 0.02m / s and 4.35m / s; decalcification process, CO 2 It comes from the flue gas after desulfurization and denitrification, the content is 10%, the reaction is carried out at the superficial gas velocity of 0.002m / s, 1.84m / s, and the circulating liquid velocity, and ...

Embodiment 3

[0036] Adopt above-mentioned system and method to initial magnesium hardness and calcium hardness (as CaCO 3 The water volume of 9083mg / L and 4358mg / L respectively is 22m 3 / h desulfurization waste water C is softened, and the top inner wall of the external cylinder reactor is equipped with annularly distributed pressure nozzles. A waste water cyclone and a fiber filter are set before the second-stage airlift loop reactor. In the magnesium removal process, the selected alkaline softener is NaOH, and the alkali amount is 192kg / h (OH — / Mg 2+ The molar ratio is 2.4), and the reaction is carried out at superficial gas velocity and circulating liquid velocity of 0.01m / s, 3.36m / s; decalcification process, CO 2 It comes from the flue gas after desulfurization and denitrification, and the content is 12%. The reaction is carried out at the superficial gas velocity of 0.02m / s and 4.35m / s, and the circulating liquid velocity, and the CO 2 Solubility effect, calcium cannot be comple...

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Abstract

The invention belongs to the technical field of wastewater treatment and specifically relates to a wet desulphurization wastewater softening system based on air-lifting type circulating reactors and a wet desulphurization wastewater softening method based on air-lifting type circulating reactors. Two-level air-lifting type circulating reactors are arranged as core components of the system. The system is equipped with the matching devices, such as, a buffer pool, a liquid solid separating device and a flue gas recovering device. The system has the main characteristics that to-be-treated wet desulphurization wastewater is buffered and settled and then enters into a first level air-lifting type circulating reactor which has the function of taking compressed air as a power source and removing magnesium by an alkaline softening agent, and then the wastewater after the magnesium removal passes by the liquid solid separating device and enters into a second level air-lifting type circulating reactor which has the function of taking the desulfurized and denitrified flue gas conveyed by the flue gas recovering device as the power source and decalcifying through the CO2 in the flue gas and the auxiliary softening drug. The system can realize the stepping softening of magnesium removal and decalcification of the wet desulphurization wastewater on the basis of the two-level air-lifting type circulating reactors and is beneficial to the realization of zero emission of the desulphurization wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a loop reactor-based wet desulfurization wastewater softening system and method. Background technique [0002] The wet desulfurization process will produce a large amount of desulfurization wastewater. The desulfurization wastewater does not have a typical water quality. However, its main characteristics can be summarized as follows: certain heavy metal content exceeds the standard, high concentration of suspended solids, high chloride radicals, and high salinity. Complex water quality characteristics force desulfurization wastewater to be treated in a zero-discharge manner. [0003] Compared with the removal of heavy metals and suspended solids, the key to zero discharge of desulfurization wastewater at this stage lies in desalination. At present, the desalination methods of desulfurization wastewater are mainly membrane method and evaporation method. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/18
CPCC02F1/001C02F1/38C02F1/5281C02F5/08C02F9/00C02F2103/18
Inventor 郑宗明聂向欣陆强董长青崔孝洋覃吴
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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