Brine processing system having front heat exchanger and rear deduster and method thereof

A technology of a treatment system and a treatment method, applied in the field of waste water treatment, can solve the problems of low purity, ash agglomeration and recovery of crystal salt purity, and achieve the effects of reducing cost, good atomization effect, and avoiding secondary pollution

Active Publication Date: 2017-09-15
ZHEJIANG UNIV
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Problems solved by technology

[0012] The purpose of the present invention is to provide a brine treatment system with a pre-heat exchanger and a rear-end dust collector to solve the problems of ash accumulation and agglomeration during the spray evaporation process of desulfurization wastewater and the low purity of recovered crystalline salt

Method used

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  • Brine processing system having front heat exchanger and rear deduster and method thereof

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Embodiment

[0036] see figure 1 , the brine treatment system with a pre-heat exchanger and a rear-end dust collector includes a boiler 1, a denitrification device 13, an air preheater 12, an electric precipitator 11, a desulfurization tower 10, and a dehydration concentration device 8, which are connected in sequence through pipelines , water pump 7 and spray evaporation tower 4, also includes shell and tube heat exchanger 3, bag filter 6 and chimney 9. Wherein, there are two passages connected in parallel between the denitrification device 13 and the desulfurization tower 10 , and each passage is provided with an air preheater 12 and an electrostatic precipitator 11 .

[0037] Between the denitration device 13 and the air preheater 12, there is a bypass flue 2 as a heating medium lead-out channel. The raw flue gas inlet of the shell-and-tube heat exchanger 3 communicates with the end of the bypass flue 2. The raw flue gas outlet of the heater 3 communicates with the outlet of the air pr...

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Abstract

The invention discloses a brine processing system having a front heat exchanger and a rear deduster and a method thereof. The brine processing system comprises a boiler, an air preheater, an electric deduster, a desulfurization tower, a dewatering condensation apparatus and a spray evaporation tower, a denitration apparatus is arranged on a pipeline between the boiler and the air preheater; a bypass flue as a heating medium leading channel is arranged between the denitration apparatus and the air preheater, an end of the bypass flue is connected with a pipe of a shell-and-tube heat exchanger, hot air after heat exchange is carried out outside the pipe is introduced into the spray evaporation tower, hot air and inner desulfurization waste water atomized droplets are mixed for precipitating a salt substance, the high-temperature flue gas after heat exchange in the pipe is introduced into the electric deduster; a rotary atomizer is arranged at top of the spray evaporation tower, a recovery pipeline communicated with the desulfurization tower is arranged at the side part, and a cloth bag deduster is arranged on the recovery pipeline. The high-temperature flue gas is used for heating clean air, the hot air is used for evaporation of the desulphurization waste water atomized droplets, so that zero discharge of the desulphurization waste water is realized.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a brine treatment system with a pre-heat exchanger and a rear-end dust collector and a method thereof. Background technique [0002] China is a country dominated by thermal power generation. More than 90% of the power plants use limestone-gypsum wet flue gas desulfurization process. During the operation of the flue gas desulfurization system, a certain amount of desulfurization wastewater will be produced, and the desulfurization wastewater contains a lot of calcium. ions, sulfate ions, chloride ions, heavy metal ions and suspended solids. In addition, desulfurization wastewater is also characterized by high acidity and excessive chemical oxygen demand (COD). [0003] The treatment method of desulfurization wastewater in thermal power plants is mainly the traditional chemical treatment method, but the chemical treatment method has complex processes, high cost, and the removal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/12C02F1/16F23J15/00C02F103/18
CPCF23J15/006C02F1/048C02F1/12C02F1/16C02F2103/18
Inventor 周昊
Owner ZHEJIANG UNIV
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