MVR concentration and swirling-flow atomization cooperated processing process and system

A collaborative treatment and process technology, applied in the direction of water/sewage treatment, heating water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of difficult sales of salt, frequent cleaning, large amount of sludge, etc., and reduce operation Cost, reduce the effect of chemical agent dosing

Pending Publication Date: 2018-08-10
GUANGDONG DEGA POWER ENVIRONMENTAL PROTECTION TECH CO LTD
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Problems solved by technology

Due to the high content of calcium and magnesium ions in desulfurization wastewater, membrane treatment requires pretreatment. The cost of desulfurization wastewater treated by this method is high in chemical costs and large in sludge volume
Evaporation and crystallization treatment is adopted. If the pretreatment is used in the previous stage, the chemical cost of this method is also high and the amount of sludge is large; if the pretreatment is not used in the previous stage, the evaporative crystallizer is cleaned frequently after operation, the cost of cleaning chemicals is high, and evaporation crystallization occurs. The sale of the salt is also a big problem

Method used

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  • MVR concentration and swirling-flow atomization cooperated processing process and system

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Embodiment 1

[0039] refer to figure 1 , the MVR concentration and swirl atomization cooperative processing system of this embodiment includes a heat exchanger, an MVR evaporation system and a boiler bypass flue system;

[0040] The MVR evaporation system includes a heater 21, a steam-water separator 22 and a circulation pump 23 arranged between them;

[0041] The boiler bypass flue system includes an air preheater 31, a boiler bypass flue with a swirling atomization chamber 32, and an electrostatic precipitator 33; the air inlet of the air preheater 31 is connected to the boiler flue gas, and its gas outlet is connected to The air inlet of the boiler bypass flue is connected, and the gas outlet of the boiler bypass flue is connected with the air inlet of the electrostatic precipitator 33; the water inlet of the swirling atomization chamber 32 is connected with the concentrated liquid outlet of the steam-water separator 22;

[0042] The water inlet of the heat exchanger is connected with w...

Embodiment 2

[0066] The characteristics of this embodiment are: when the amount of desulfurization wastewater is small, the desulfurization wastewater flows into the water buffer tank by itself, and caustic soda is added to adjust the pH value. Under alkaline conditions, the desulfurization wastewater can be directly pumped to the air through the wastewater atomization pump. The desulfurization wastewater is dried in the swirl atomization chamber of the bypass flue after the preheater.

Embodiment 3

[0068] The feature of this embodiment is: when the boiler load is too low, the high-temperature flue gas in front of the air preheater can be used to transport to the boiler bypass flue system to provide heat for the swirling atomized wastewater to ensure that the wastewater is completely evaporated.

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Abstract

The invention discloses an MVR concentration and swirling-flow atomization cooperated processing process and system. The process combines the MVR evaporation technology and a bypass flue swirling-flowatomization evaporation drying method to treat desulfurization waste water, the desulfurization waste water is subjected to preprocessing and heat exchanging and is concentrated in an MVR evaporationsystem, the concentrated desulfurization waste water is atomized by the swirling-flow atomization method and then enters a boiler bypass flue at the rear of an air preheater, boiler hot flue gas is used to evaporate and dry the wastewater, salt in the dried wastewater forms a powdered product, and the dried product enters an electrostatic precipitator along with the flue gas and is processed therein. The MVR concentration and swirling-flow atomization cooperated processing process and system can effectively lower energy consumption and can solve the salt treatment problem in desulfurization waste water zero emission.

Description

technical field [0001] The invention relates to a waste water treatment process and system, in particular to an MVR concentration and swirl atomization cooperative treatment process and system. Background technique [0002] The impurities contained in desulfurization wastewater come from flue gas and limestone for desulfurization, mainly including suspended solids, supersaturated sulfite, sulfate and heavy metals, many of which are the first category of pollutants required to be controlled in the national environmental protection standards. Due to the particularity of water quality, it is difficult to treat desulfurization wastewater. [0003] At present, there are many technical routes for the zero discharge of desulfurization wastewater. By summarizing the treatment process, there are mainly membrane treatment and evaporation crystallization treatment. Due to the high content of calcium and magnesium ions in desulfurization wastewater, membrane treatment requires pretreat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/10C02F1/16C02F1/52
Inventor 黄皆斌陈卓彬刘定平岑知红胡淼
Owner GUANGDONG DEGA POWER ENVIRONMENTAL PROTECTION TECH CO LTD
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