CN212864234U - Slurry desalting device of limestone desulfurization system - Google Patents

Slurry desalting device of limestone desulfurization system Download PDF

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CN212864234U
CN212864234U CN202021266036.1U CN202021266036U CN212864234U CN 212864234 U CN212864234 U CN 212864234U CN 202021266036 U CN202021266036 U CN 202021266036U CN 212864234 U CN212864234 U CN 212864234U
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concentrated water
channel
salt concentrated
box
sodium chloride
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王一
郑见云
赵军
刘伟杰
杨立兵
高丹
胡珺
周昊
田绍钢
贾本康
程英捷
高扬
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State Grid Anhui Electric Power Co Ltd
Beijing Lucency Enviro Tech Co Ltd Nanjing Branch
Guodian Anhui Power Co Ltd
Guodian Bengbu Power Generation Co Ltd
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Beijing Lucency Enviro Tech Co Ltd Nanjing Branch
Guodian Anhui Power Co Ltd
Guodian Bengbu Power Generation Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination

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Abstract

The utility model provides a slurry desalting device of a limestone desulfurization system. The utility model comprises a solid-liquid separation box, wherein the liquid phase outlet of the solid-liquid separation box is connected with a desalination buffer box through a pipeline, the desalination buffer box is connected with a six-channel electrodialysis device through a circulating pump, and the desalination buffer box is connected with a desulfurization system through a pipeline; the six-channel electrodialysis device is respectively connected with a sodium chloride buffer tank, a chlorine salt concentrated water circulation tank and a sodium salt concentrated water circulation tank through pipelines, and the sodium chloride buffer tank is respectively connected with a sodium chloride solution inlet pipeline and a sodium chloride solution outlet pipeline; the chlorine salt concentrated water circulation box is connected with a chlorine salt concentrated water discharge pipeline, and the sodium salt concentrated water circulation box is connected with a sodium salt concentrated water discharge pipeline. The utility model discloses realize that the replacement of the high scale deposit risk salt component of desulfurization slurry separates and the high magnification is concentrated, and furthest reduces desulfurization system pollutant emission, has improved desulfurization system operational reliability and economic nature.

Description

Slurry desalting device of limestone desulfurization system
The technical field is as follows:
the utility model relates to a lime stone desulfurization system thick liquid desalination device belongs to desalination processing technology field.
Background art:
the coal-fired power plant commonly adopts limestone-gypsum wet flue gas desulfurization technology to remove sulfur dioxide in flue gas, and limestone reacts with sulfur dioxide and oxygen to generate gypsum in the contact process of lime slurry and flue gas, so that the removal of sulfur dioxide in flue gas is realized. Along with the increase of the cycle number, the concentration of soluble substances such as chloride ions, magnesium ions and the like in the lime slurry is continuously increased, the problems of slurry foaming, limestone shielding and the like are easily caused, the operation of a desulfurization system is difficult, and in order to ensure the safe and stable operation of the desulfurization system, the concentrations of the chloride ions and the magnesium ions of the slurry of the desulfurization system are mainly controlled by discharging desulfurization wastewater. As the concentration of chloride ions in the desulfurization slurry cannot exceed 20000mg/L under the conventional conditions, the problems of large external discharge amount of desulfurization wastewater, high solid waste yield, excessive heavy metal ions and the like are caused, and along with the strictness of the increasingly strict national environmental protection policy, a great amount of desulfurization wastewater which is discharged with high salt content, high hardness and high suspended matters brings great environmental protection risks to a thermal power plant.
Therefore, the development of the desulfurization system slurry desalting method has important significance for reducing the desulfurization wastewater discharge and ensuring the economic and reliable operation of the desulfurization system.
The utility model has the following contents:
the utility model aims at the problem that exists provides a lime stone desulfurization system thick liquid desalination device, to the salt desorption in the desulfurization thick liquid, solve desulfurization thick liquid operation in-process salt content and constantly increase the system operation problem that brings, the sodium chloride that easily acquires with the low cost is the raw materials, realizes the replacement separation and the high magnification concentration of the high scale deposit risk salt component of desulfurization thick liquid, furthest reduces desulfurization system pollutant emission, has improved desulfurization system operational reliability and economic nature.
The above purpose is realized by the following technical scheme:
a slurry desalting device of a limestone desulfurization system comprises a solid-liquid separation box, wherein a liquid phase outlet of the solid-liquid separation box is connected with a desalting buffer box through a pipeline, the desalting buffer box is connected with a six-channel electrodialysis device through a circulating pump, and the desalting buffer box is connected with a desulfurization system through a pipeline; the six-channel electrodialysis device is respectively connected with a sodium chloride buffer tank, a chlorine salt concentrated water circulation tank and a sodium salt concentrated water circulation tank through pipelines, and the sodium chloride buffer tank is respectively connected with a sodium chloride solution inlet pipeline and a sodium chloride solution outlet pipeline; the chlorine salt concentrated water circulation box is connected with a chlorine salt concentrated water discharge pipeline, and the sodium salt concentrated water circulation box is connected with a sodium salt concentrated water discharge pipeline.
In the slurry desalting device of the limestone desulfurization system, an anode membrane, a cathode membrane and a cathode membrane are sequentially combined from an anode to a cathode in the six-channel electrodialysis device to form a six-channel electrodialysis structure, wherein the six channels are an anolyte channel, a sodium salt concentrated water channel, a desulfurization slurry channel, a chloride channel, a sodium chloride channel and a catholyte channel; the anolyte channel is connected with an anolyte circulating box through an anolyte circulating pump; the sodium salt concentrated water channel is connected with a sodium salt concentrated water circulating tank through a sodium salt concentrated water circulating pump; the desulfurization slurry channel is connected with the desalting buffer tank through a desalting circulating pump; the chlorine salt passage is connected with a chlorine salt concentrated water circulating tank through a chlorine salt concentrated water circulating pump; the catholyte channel is connected with the catholyte circulating box through the catholyte circulating pump.
Has the advantages that:
the utility model discloses use a six passageway electrodialysis as core treatment equipment, to the salt desorption in the desulfurization slurry, solve the desulfurization slurry operation in-process salt content and constantly increase the system operation problem that brings, the sodium chloride that easily acquires with the low cost is the raw materials, realizes the replacement separation and the high magnification concentration of the high scale deposit risk salt component of desulfurization slurry, and furthest reduces desulfurization system pollutant emission, has improved desulfurization system operational reliability and economic nature. The desulfurization system provided with the desulfurization slurry desalting device is free from discharging high-concentration and high-turbidity desulfurization wastewater, and does not need to carry out traditional physicochemical treatment on the desulfurization wastewater, so that the solid waste yield is reduced to the maximum extent, and meanwhile, because the process can realize high-rate concentration, the TDS of the sodium salt concentrated water and the chloride concentrated water can reach more than 18%, and the discharge amount of the system can be reduced to the maximum extent.
Description of the drawings:
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic structural diagram of the six-channel electrodialysis device of the present invention.
In the figure: 1. the system comprises a solid-liquid separation box, 2. a desalting buffer box, 3. a desalting circulating pump, 4. a six-channel electrodialysis device, 5. a sodium chloride buffer box, 6. a sodium chloride circulating pump, 7. a chlorine salt concentrated water circulating box, 8. a chlorine salt concentrated water circulating pump, 9. a sodium salt concentrated water circulating box, 10. a sodium salt concentrated water circulating pump, 11. a catholyte circulating box, 12. a catholyte circulating pump, 13. an anolyte circulating box, 14. an anolyte circulating pump, 15. a sludge conveying pump, 41. an anolyte channel, 42. a sodium salt concentrated water channel, 43. a desulfurization slurry channel, 44. a chlorine salt channel, 45. a sodium chloride channel, and 46. a catholyte channel.
The specific implementation mode is as follows:
example 1:
as shown in fig. 1-2: the utility model discloses a limestone desulfurization system slurry desalting device, including the solid-liquid separation case, the liquid phase outlet of solid-liquid separation case passes through the pipe connection desalination surge tank, the desalination surge tank passes through the circulating pump and connects six-channel electrodialysis device, the desalination surge tank passes through the pipe connection desulfurization system; the six-channel electrodialysis device is respectively connected with a sodium chloride buffer tank, a chlorine salt concentrated water circulation tank and a sodium salt concentrated water circulation tank through pipelines, and the sodium chloride buffer tank is respectively connected with a sodium chloride solution inlet pipeline and a sodium chloride solution outlet pipeline; the chlorine salt concentrated water circulation box is connected with a chlorine salt concentrated water discharge pipeline, and the sodium salt concentrated water circulation box is connected with a sodium salt concentrated water discharge pipeline.
In the slurry desalting device of the limestone desulfurization system, an anode membrane, a cathode membrane and a cathode membrane are sequentially combined from an anode to a cathode in the six-channel electrodialysis device to form a six-channel electrodialysis structure, wherein the six channels are an anolyte channel, a sodium salt concentrated water channel, a desulfurization slurry channel, a chloride channel, a sodium chloride channel and a catholyte channel; the anolyte channel is connected with an anolyte circulating box through an anolyte circulating pump; the sodium salt concentrated water channel is connected with a sodium salt concentrated water circulating tank through a sodium salt concentrated water circulating pump; the desulfurization slurry channel is connected with the desalting buffer tank through a desalting circulating pump; the chlorine salt passage is connected with a chlorine salt concentrated water circulating tank through a chlorine salt concentrated water circulating pump; the catholyte channel is connected with the catholyte circulating box through the catholyte circulating pump.
The method for desalting by using the slurry desalting device of the limestone desulfurization system comprises the following steps:
(1) enabling filtrate of a vacuum belt conveyor of a desulfurization system to enter a solid-liquid separation box, adding a flocculating agent into the solid-liquid separation box to enable suspended matters to be fully flocculated and settled to the bottom of the solid-liquid separation box, lifting the suspended matters by a sludge lifting pump and then refluxing to the desulfurization system, and enabling clear desulfurization slurry to enter a desalting buffer box;
(2) lifting the desulfurization slurry clear liquid in the desalting buffer tank by a desalting circulating pump to enter a six-channel electrodialysis device, wherein in the six-channel electrodialysis device, cations in the desulfurization slurry clear liquid migrate under the action of an electric field to enter a chlorine salt concentrated water chamber, anions migrate to enter a sodium salt concentrated water chamber, and the desulfurization slurry clear liquid subjected to desalting treatment is recovered to a desulfurization system;
(3) high-concentration sodium chloride solution enters a sodium chloride buffer tank, is conveyed by a sodium chloride circulating pump and then enters a six-channel electrodialysis device, and Na in the sodium chloride solution+Ion migration into the sodium salt concentrated water chamber, Cl-The ions migrate into a chlorine salt concentrated water chamber, and the low-concentration sodium chloride solution is recovered to the front end for dissolving sodium chloride solids;
(4) the chlorine salt concentrated water in the chlorine salt concentrated water circulating tank enters the six-channel electrodialysis device under the lifting of the chlorine salt concentrated water circulating pump, and cations migrated from the desulfurized slurry comprise Ca2+、Mg2+、Na+、K+、Fe2+Cl migrating with sodium chloride solution-Ion combination to generate high-concentration chlorine salt concentrated water;
(5) the sodium salt concentrated water in the sodium salt concentrated water circulating tank enters a six-channel electrodialysis device under the lifting of the sodium salt concentrated water circulating pump, and anions migrated from the desulfurized slurry comprise Cl-、F-、SO4 2-、NO3 -Ions migrate with the sodium chloride solutionNa of (2)+Ion combination to generate high-concentration sodium salt concentrated water;
(6) the industrial water is fed into a chlorine salt concentrated water circulating box and a sodium salt concentrated water circulating box, the concentrated water concentration is discharged by adjusting a chlorine salt concentrated water circulating box and a sodium salt concentrated water circulating box water inlet flow control system, and the discharged concentrated water is used for evaporation curing treatment or resource utilization.
In the method for desalting the slurry of the limestone desulfurization system, in the step (3), the concentration of the high-concentration sodium chloride solution is 8%, and the concentration of the low-concentration sodium chloride solution is 2%.
The concrete trial cases are as follows:
8m of original discharged wastewater of desulfurization system3H, Ca in wastewater2+Ion concentration: 1100Mg/L, Mg2+Ion concentration: 5800mg/L, Na+Ion concentration 3000mg/L, Cl-Ion concentration 19000mg/L, SO4 2-The ion concentration is 6000mg/L, and the original desulfurization wastewater treatment system is cancelled after modification, and a desulfurization slurry desalting system is added. The desulfurized slurry is led out of the self-refluxing water tank by about 30m3And/h, adding 5ppm of PAM coagulant aid and 10ppm of PAC flocculant, fully reacting, then feeding the mixture into a solid-liquid separation box, allowing the solid-liquid separation box to stay for 2 hours, allowing clear liquid to automatically flow into a desalting buffer box, lifting the clear liquid by a desalting circulating pump, and then feeding the clear liquid into six-channel electrodialysis, wherein the designed ion migration amount of the six-channel electrodialysis is 5500 mol/h.
Desalting the slurry to obtain Ca solution2+Ion concentration: 795 mg/L; mg (magnesium)2+Ion concentration: 4190 mg/L; na (Na)+Ion concentration: 2168 mg/L; cl-Ion concentration: 13724 mg/L; SO (SO)4 2-Ion concentration: 4333 mg/L.
1544Kg/h of chlorine salt concentrated water and Ca in the chlorine salt concentrated water are generated2+Ion concentration: 0.6 percent; mg (magnesium)2+Ion concentration: 3.1 percent; na (Na)+Ion concentration: 1.6 percent; cl-Ion concentration: 12.6 percent.
1861Kg/h of sodium salt concentrated water is produced, and Na is contained in the sodium salt concentrated water+Ion concentration: 6.8 percent; cl-Ion concentration: 8.5 percent; SO (SO)4 2-Ion concentration: 2.7 percent.
The concentration of the sodium chloride solution is 8 percent, the feeding amount is 5362Kg/h, the reflux concentration is 2 percent, and the reflux sodium chloride dilute solution can be used for dissolving sodium chloride solids.
The catholyte circulation box is provided with 3 percent sodium chloride solution as catholyte, and the anolyte circulation box is provided with 3 percent sodium sulfate solution as anolyte. In the desalting process of the desulfurization slurry, sodium chloride is used as a raw material, and anions and cations of the desulfurization slurry are respectively replaced and concentrated in the desalting process, so that the scaling risk in the concentrating process is eliminated.
The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the technical means, but also comprises the technical scheme consisting of the equivalent replacement of the technical features. The present invention is not to be considered as the best thing, and belongs to the common general knowledge of the technicians in the field.

Claims (2)

1. The utility model provides a lime stone desulfurization system thick liquid desalination device which characterized in that: the device comprises a solid-liquid separation box, wherein a liquid phase outlet of the solid-liquid separation box is connected with a desalination buffer box through a pipeline, the desalination buffer box is connected with a six-channel electrodialysis device through a circulating pump, and the desalination buffer box is connected with a desulfurization system through a pipeline; the six-channel electrodialysis device is respectively connected with a sodium chloride buffer tank, a chlorine salt concentrated water circulation tank and a sodium salt concentrated water circulation tank through pipelines, and the sodium chloride buffer tank is respectively connected with a sodium chloride solution inlet pipeline and a sodium chloride solution outlet pipeline; the chlorine salt concentrated water circulation box is connected with a chlorine salt concentrated water discharge pipeline, and the sodium salt concentrated water circulation box is connected with a sodium salt concentrated water discharge pipeline.
2. The limestone desulfurization system slurry desalination device of claim 1, wherein: the six-channel electrodialysis device is characterized in that an anode membrane, a cathode membrane, the anode membrane, the cathode membrane and a cathode membrane are sequentially combined from an anode to a cathode to form a six-channel electrodialysis structure, and the six channels are an anolyte channel, a sodium salt concentrated water channel, a desulfurization slurry channel, a chloride channel, a sodium chloride channel and a catholyte channel in sequence; the anolyte channel is connected with an anolyte circulating box through an anolyte circulating pump; the sodium salt concentrated water channel is connected with a sodium salt concentrated water circulating tank through a sodium salt concentrated water circulating pump; the desulfurization slurry channel is connected with the desalting buffer tank through a desalting circulating pump; the chlorine salt passage is connected with a chlorine salt concentrated water circulating tank through a chlorine salt concentrated water circulating pump; the catholyte channel is connected with the catholyte circulating box through the catholyte circulating pump.
CN202021266036.1U 2020-07-02 2020-07-02 Slurry desalting device of limestone desulfurization system Active CN212864234U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114590933A (en) * 2022-01-19 2022-06-07 国能朗新明南京环保科技有限公司 Method for processing grinding blocks by desulfurization slurry ion removal and concentrated solution resource preparation magnesium chloride cement method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114590933A (en) * 2022-01-19 2022-06-07 国能朗新明南京环保科技有限公司 Method for processing grinding blocks by desulfurization slurry ion removal and concentrated solution resource preparation magnesium chloride cement method

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