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Flue gas desulfurization wastewater and sludge integration pretreating system and technology

A wastewater treatment system and desulfurization wastewater technology, applied in water/sludge/sewage treatment, gaseous effluent wastewater treatment, water/sewage multi-stage treatment, etc. Scale, suspended solids increase and other problems, to achieve significant economic benefits, reduce dosage, reduce investment and operating costs

Active Publication Date: 2016-01-06
JIANGSU HAIRONG THERMAL ANDENVIRONMENTAL ENG CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, the above-mentioned processes all face the problem of scale formation of hardness ions in the desalination system in the desulfurization wastewater during actual operation.
Even if the power plant adopts the softening system, the design of the softening system still has the problems of poor operation effect, increased dosage of softener for suspended solids, and difficulty in the treatment and disposal of desulfurization wastewater sludge after pretreatment

Method used

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  • Flue gas desulfurization wastewater and sludge integration pretreating system and technology

Examples

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Embodiment 1

[0032] The invention also discloses an integrated pretreatment process of flue gas desulfurization wastewater and sludge. The pretreatment process is specifically as follows:

[0033] (1) The flue gas produced by the boiler is absorbed into the absorption tower 1, and lime is added to the desulfurization slurry tank 2 at the same time, mixed evenly and sprayed from the top of the absorption tower 1 to make it absorb sulfur dioxide in the flue gas and absorb sulfur dioxide slurry The reaction generates calcium sulfite and enters in the oxidation tower 3;

[0034] (2) At this time, air is blown into the oxidation tower 3 to force the calcium sulfite to oxidize and crystallize, and the oxidized slurry enters the cyclone 4 for solid-liquid separation, and the supernatant after solid-liquid separation is returned to the oxidation tower In 3, the concentrated slurry at the bottom is dehydrated by the vacuum belt dehydrator 5, and after the dehydration is completed, solid gypsum is f...

Embodiment 2

[0040] The difference between this example and Example 1 is: in step (4), the pH of sodium hydroxide and sodium carbonate is controlled to be 10.5-11.5, the dosage of sodium carbonate is 2000-5000 mg / L, the dosage of anionic polyacrylamide is The dosage is controlled to be 5-50 mg / L.

[0041] When the pretreatment process is adopted, the average fouling thickness of the inner wall of the softening device is 1.84mm after the system works continuously for 3 months.

Embodiment 3

[0043] The differences between this example and Example 1 are: in step (4), the pH of sodium hydroxide and sodium carbonate is controlled to be 11.5-13, the dosage of sodium carbonate is 5000-8000 mg / L, and the dosage of anionic polyacrylamide is 5000-8000 mg / L. The dosage is controlled to be 50-70 mg / L.

[0044] When the pretreatment process is adopted, the average fouling thickness of the inner wall of the softening device is 3.12 mm after the system has been working continuously for 3 months.

[0045] Therefore, according to the above example, the average fouling thickness of the inner wall of the softening device in Example 2 is the smallest, so the pH of sodium hydroxide and sodium carbonate is selected to be 10.5-11.5, the dosage of sodium carbonate is 2000-5000 mg / L, anionic polypropylene The dosage of amide is controlled at 5-50 mg / L.

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Abstract

The invention relates to a flue gas desulfurization wastewater and sludge integration pretreating system and technology. The flue gas desulfurization wastewater and sludge integration pretreating system comprises a flue gas wet desulfurization system and a wastewater treatment system. Flue gas desulfurization wastewater firstly enters a pre-coagulation pool and then enters a pre-sedimentation pool after a pre-coagulation compound medicament is put, solid-liquid separation is performed to obtain solid sediments which take gypsum or magnesium sulfate as main components, and then the flue gas desulfurization wastewater flows back to a swirler of the desulfurization system; effluent of the pre-sedimentation pool enters a softening pool and then enters a softening sedimentation pool after a compound softening agent is put, solid-liquid separation is performed to obtain sediments which take desulfurizing agents as the main components, and then the effluent flows back into a desulfurization size tank for flue gas desulfurization; effluent of the softening sedimentation pool enters a neutralization pool, and the pH of the effluent is regulated to be neutral. The flue gas desulfurization wastewater and sludge integration pretreating system and technology have the advantages that the system organically combines the flue gas wet desulfurization system with the wastewater treatment system, direct reusing of desulfurization wastewater and sludge is achieved, a concentrating and dewatering unit of the desulfurization wastewater and sludge is omitted, and the investment and operation cost of desulfurization wastewater treatment is reduced.

Description

technical field [0001] The invention relates to an integrated pretreatment system of flue gas desulfurization wastewater and sludge and a process thereof, belonging to the technical field of environmental protection and rational utilization of water resources. Background technique [0002] Sulfur dioxide is not only a major air pollutant, but also one of the important causes of acid rain. Relevant data show that in 1995, China's sulfur dioxide emissions have surpassed the United States to become the world's largest sulfur dioxide emitter. According to the "2014 China Environmental Status Bulletin", the total amount of sulfur dioxide emissions in the country is 19.744 million tons, of which the sulfur dioxide emissions from thermal power plants rank first. Therefore, the characteristics of my country's energy structure determine that the control of coal-fired sulfur dioxide emissions is the focus of my country's control of sulfur dioxide pollution, and the control of sulfur ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/96C02F9/04C02F103/18
Inventor 蒋路漫周振窦微笑陈国锋胡敏娴孙红云
Owner JIANGSU HAIRONG THERMAL ANDENVIRONMENTAL ENG CO LTD
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