Desulfurization wastewater recycling process and implementation device

A desulfurization wastewater and recycling technology, which is applied in descaling and water softening, gaseous effluent wastewater treatment, inorganic chemistry, etc., can solve immature problems, reduce chloride ion content, realize resource utilization, and promote volatilization Effect

Inactive Publication Date: 2018-12-25
SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technical process for dechlorination of desulfurization wastewater is not yet mature, and there are problems in the effectiveness of the technology and the economy of the process.

Method used

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  • Desulfurization wastewater recycling process and implementation device
  • Desulfurization wastewater recycling process and implementation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 and figure 2 , a process for resource recycling of desulfurization wastewater in this embodiment, comprising the following steps:

[0034] ① Pretreat the desulfurization wastewater discharged from the desulfurization tower. The pretreatment method is to add chemical solution, partially soften, remove heavy metals, and separate solid and liquid;

[0035] ② Flocculation and clarification of pretreated desulfurization wastewater;

[0036] ③ Add quantitative concentrated sulfuric acid to the clarified desulfurization wastewater, and mix the desulfurization wastewater with strong acid;

[0037] ④Wastewater is treated by gas-liquid mass transfer process;

[0038] ⑤ Collect the hydrogen chloride gas produced in the gas-liquid mass transfer process and convert it into hydrochloric acid with higher purity, which can be used as a resource;

[0039] ⑥ After the gas-liquid mass transfer process, the treated wastewater is added with milk of lime to adjust the pH to...

Embodiment 2

[0050]This embodiment 2 also adopts the same process as that of embodiment 1. After the waste water is clarified, its chloride ion content is measured, and a corresponding amount of concentrated sulfuric acid is added to the waste water. Further, the waste water enters the spray tower 1, and the low-quality steam or waste heat air in the factory area is blown into the tower, and the gas and liquid flow in the same direction. The gas flow loaded with hydrogen chloride enters another spray tower 5, is absorbed by the spray liquid, and the gas flow recirculates into the waste water spray tower 1 to carry out circulation treatment of gas-liquid mass transfer. Industrial water can be used for the absorption liquid, which is discharged after reaching a certain concentration and filled with new absorption liquid. Further, after the waste water circulates and stays in the spray tower 5 for a certain period of time, it is discharged and an alkaline agent is added to adjust the pH of th...

Embodiment 3

[0052] After the wastewater is clarified, a corresponding amount of concentrated nitric acid is added to the wastewater. Further, the waste water enters the spray tower 1, and air is blown into the tower, and the gas and liquid flow in the same direction. The gas flow loaded with hydrogen chloride enters another spray tower 5, is absorbed by the spray liquid, and the gas flow recirculates into the waste water spray tower 1 to carry out circulation treatment of gas-liquid mass transfer. Sodium hydroxide solution is used as the absorption liquid, and sodium hydroxide caustic soda or liquid caustic soda is added after the absorption liquid reaches a certain pH.

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Abstract

The invention belongs to the field of industrial wastewater treatment. A desulfurization wastewater recycling process includes: pretreating desulfurization wastewater discharged from a desulfurizationtower, mixing pretreated desulfurization wastewater with strong acid, performing gas-liquid mass transfer process treatment, collecting gas generated in gas-liquid mass transfer process treatment, adding lime milk into desulfurization wastewater after gas-liquid mass transfer process treatment to adjust pH to a certain fixed value, and returning wastewater reaching conditions of serving as replenishing water for a desulfurization process into the desulfurization tower to realize recycling. The implementation device of the desulfurization wastewater recycling process comprises a gas-liquid mass transfer device and a wastewater pH adjusting device. A pretreatment tank, an acid adjustment tank and the gas-liquid mass transfer device are in sequential connection, and a first spray tower and asecond spray tower are connected with a tail gas collection device and the wastewater pH adjusting device respectively. The process has advantages that by the engineering design, the process is slightly affected by desulfurization wastewater fluctuation, lower in investment and operating cost than similar processes, free of secondary pollutant solid wastes and the like, easiness in automatic operating of engineering and the like.

Description

technical field [0001] The invention belongs to the field of industrial waste water treatment, and in particular relates to a process and a realization device for resource recycling of desulfurization waste water. Background technique [0002] The flue gas desulfurization equipment of coal-fired power plants in my country mostly uses the limestone-gypsum wet desulfurization process. During the operation of the system, the hydrogen chloride gas in the flue gas and the chloride ions in the desulfurization make-up water will be continuously enriched in the desulfurization tower slurry, and the high concentration will seriously affect the desulfurization effect. The system achieves the operating condition of reducing the concentration of chloride ions by discharging part of the slurry and replenishing the process water. The discharged slurry is desulfurization wastewater, which has high salt, high hardness, high suspended solids, and heavy metals, and the water quality is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01B7/07C02F101/12C02F103/18
CPCC01B7/0712C02F1/12C02F1/5236C02F1/5281C02F1/66C02F5/00C02F9/00C02F2001/007C02F2101/12C02F2103/18
Inventor 赵飞万忠诚郑煜铭黄奕军张净瑞马明军
Owner SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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