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A recovery system and recovery process for recovering salt from desulfurization wastewater

A desulfurization wastewater and process technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, alkali metal chloride, etc., can solve problems such as affecting salt purity, and achieve the effect of avoiding corrosion

Active Publication Date: 2017-03-15
广州新普利节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The desulfurization wastewater contains more NaCl, and the NaCl product in the wastewater can be recovered while the desulfurization wastewater is being treated, but the wastewater also contains more other components, such as sulfate, etc., while evaporation and crystallization produce salt. 2 SO 4 Also crystallized out at the same time, the doping is indistinguishable in the NaCl crystal, thus affecting the purity of the salt

Method used

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  • A recovery system and recovery process for recovering salt from desulfurization wastewater
  • A recovery system and recovery process for recovering salt from desulfurization wastewater
  • A recovery system and recovery process for recovering salt from desulfurization wastewater

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specific Embodiment

[0034] refer to Figure 1-2 , a recovery system for recovering salt from desulfurization wastewater described in this embodiment, including a purification treatment device 1, a pre-heat exchange device 2, a primary evaporation crystallization device 3, a primary material transfer pump 4, and a secondary evaporation crystallization device 5. A primary centrifuge 6, a drying bed 7, a secondary centrifuge 8 and a salt-dissolving tank 9; the purification treatment device 1 is a softened water device.

[0035] One of the water inlets of the purification treatment device 1 is connected to the desulfurization wastewater delivery pipe 10, and the water outlet of the purification treatment device 1 is connected to the pre-heat exchange device 2 and the primary evaporation crystallization device 3 through pipelines in turn; the primary evaporation crystallization The output port of the primary concentrated brine of the device 3 is connected with the secondary evaporation and crystalliza...

Embodiment 1

[0061] Example 1: Evaporation at 50°C

[0062] Sodium chloride-sodium sulfate-water solubility components, as shown in Table 3:

[0063] Table 3 Solubility of sodium chloride-sodium sulfate-water at 50℃

[0064]

[0065]

[0066] According to the mutual solubility relationship of sodium chloride-sodium sulfate at 50°C, the first-stage evaporation should control the sodium sulfate component to be less than 5.3%, and the sodium chloride component is greater than 24.2%, so that sodium chloride crystals can be precipitated, and Sodium sulfate did not precipitate out. That is, the primary evaporation is:

[0067] m (Na2SO4) / (M 总 -M 蒸发 )*100%<5.3%;

[0068] m 蒸发 总 -M (Na2SO4) *100% / 5.3%;

[0069] m 蒸发 <15943.2-317.3*100% / 5.3% Kg / h;

[0070] i.e. M 蒸发 <9956.4Kg / h;

[0071] Now sodium chloride component content is: M (NaCl) / (M total-M evaporation)*100%=2900 / (15943.2-9956.4)*100%=48.44%;

[0072] The solubility of sodium chloride is greater than 24.2% at this tempe...

Embodiment 2

[0079] Example 2: Evaporation at 75°C

[0080] Solubility components of sodium chloride-sodium sulfate-water, as shown in Table 4:

[0081] Table 4 Solubility of sodium chloride-sodium sulfate-water at 75°C

[0082]

[0083] According to the mutual solubility relationship of sodium chloride-sodium sulfate at 75°C, the first-stage evaporation must control the sodium sulfate component to be less than 4.95%, while the sodium chloride component is greater than 25.25%, so that pure sodium chloride crystals can be precipitated. And sodium sulfate did not separate out. That is, the primary evaporation is:

[0084] m (Na2SO4) / (M 总 -M 蒸发 )*100%<4.95%;

[0085] m 蒸发 总 -M (Na2SO4) *100% / 4.95%;

[0086] m 蒸发 <15943.2-317.3*100% / 4.95% Kg / h;

[0087] i.e. M 蒸发 <9533.1Kg / h;

[0088] Now sodium chloride component content is:

[0089] m (NaCl) / (M 总 -M 蒸发 )*100%=2900 / (15943.2-9533.1)*100%=45.24%;

[0090] The solubility of sodium chloride is greater than 25.9% at this tem...

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Abstract

The invention discloses a recycling system and a recycling process for recycling salt from desulfurization waste water. The system comprises a purifying device, a heat pre-exchange device, a first-stage evaporative crystallizing device, a first-stage material transferring pump, a second-stage evaporative crystallizing device, a first-stage centrifuge, a drying bed, a second-stage centrifuge and a salt dissolving bucket. According to the system and the method disclosed by the invention, purified desulfurization waste water is subjected to two-stage evaporation; by controlling the evaporation amount and the evaporation temperature of a first-stage evaporator, the waste water is concentrated and crystallized to generate NaCl, and Na2SO3 is not crystallized, so that the content of NaCl is enabled to be above 99%. Afterwards, a material of the first-stage evaporator is transferred to a second-stage evaporator to be evaporated and concentrated again to generate NaCl crystal and Na2SO4 crystal. The system and the method disclosed by the invention can be used for continuously producing high-purity NaCl of which the purity is larger than 99%.

Description

technical field [0001] The invention relates to the field of power plant desulfurization wastewater, in particular to a recovery system and recovery process for recovering salt from desulfurization wastewater. Background technique [0002] SO in the flue gas of thermal power plants in my country 2 The emissions are strictly controlled, so most thermal power plants use limestone wet flue gas desulfurization (FGD) to desulfurize the flue gas. But at the same time, in order to balance the concentration of chloride ions in the absorption liquid, a part of the absorption slurry must be discharged, and the clear liquid discharged from the absorption slurry after hydraulic separation is called desulfurization wastewater. The discharge of desulfurization wastewater in thermal power plant wastewater is not large, but its pollution is serious. The water quality is characterized by high content of suspended solids, pH value, and COD value. Exceeding standards include suspended solids,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/06
Inventor 黄莹莹张广林莫新来谭子斌
Owner 广州新普利节能环保科技有限公司
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