CN112875829A - Desulfurization wastewater purification system and purification method based on self-crystallization fluidized bed - Google Patents
Desulfurization wastewater purification system and purification method based on self-crystallization fluidized bed Download PDFInfo
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- CN112875829A CN112875829A CN202110095448.6A CN202110095448A CN112875829A CN 112875829 A CN112875829 A CN 112875829A CN 202110095448 A CN202110095448 A CN 202110095448A CN 112875829 A CN112875829 A CN 112875829A
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- fluidized bed
- lime
- coagulant
- calcium sulfate
- desulfurization
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
Abstract
The invention provides a desulfurization wastewater purification system and a purification method based on a self-crystallization fluidized bed, which comprises the following steps: the desulfurization wastewater is output to the pipeline mixer containing the calcium sulfate crystal circulating liquid, and the pipeline mixer is connected with a coagulant dosing device and a reaction fluidized bed; the reaction fluidized bed is also connected with a circulating pump and a gypsum slurry tank of the desulfurizing tower. The desulfurization wastewater is mixed with the circulating liquid containing calcium sulfate crystals in the pipeline mixer and then output to the reaction fluidized bed, and then is mixed with the coagulant and the lime milk in the reaction fluidized bed, and the calcium sulfate crystals continuously grow up and sink through multiple cycles and are output to the gypsum slurry tank of the desulfurization tower, so that the desulfurization wastewater is purified, the treatment efficiency is high, the effect is good, and the scaling problem when the high-concentration sulfate radical part of the high-salinity wastewater is removed can be effectively solved.
Description
Technical Field
The invention relates to the technical field of high-salinity wastewater treatment, in particular to a desulfurization wastewater purification system and a purification method based on a self-crystallization fluidized bed.
Background
Wet flue gas desulfurization wastewater of a thermal power plant belongs to high-salt wastewater, the content of sulfate radicals of the wastewater reaches 5000-70000 ppm, the content of calcium ions is 800-5000 ppm, the content of magnesium ions is 2000-8000 ppm, and the wastewater has extremely strong scaling tendency, in the process of carrying out the high-salt wastewater treatment, because of the change of pH value and other ions introduced by added treatment agents, calcium sulfate and calcium sulfate are caused, the deposition of acid calcium is caused, the scaling of a wastewater treatment device is caused, the operation of a generating device is abnormal, the treatment efficiency is reduced, and other adverse effects are caused.
Disclosure of Invention
In order to solve the problems, the invention provides a desulfurization wastewater purification system and a purification method based on a self-crystallization fluidized bed, which realize the purification of desulfurization wastewater, have high treatment efficiency and good effect, can effectively solve the problem of scaling when the high-concentration sulfate radical part of high-salinity wastewater is removed, and create conditions for the subsequent treatment of desulfurization wastewater.
In order to achieve the above purpose, the invention adopts a technical scheme that:
a desulfurization waste water purification system based on an auto-crystallization fluidized bed, comprising: the desulfurization wastewater is output to the pipeline mixer containing the calcium sulfate crystal circulating liquid, and the pipeline mixer is connected with a coagulant dosing device and a reaction fluidized bed; the reaction fluidized bed is further connected with a circulating pump and a gypsum slurry tank of the desulfurizing tower, and the lime dissolving metering tank outputs to the output end of the circulating pump.
Further, still include coagulant aid charge device, with the output of circulating pump is connected.
Further, the coagulant dosing device is connected with the pipeline mixer through a metering pump controlled by frequency conversion; the lime powder bin is connected with the lime dissolving metering box through a lime metering device; the reaction fluidized bed is connected with the gypsum slurry tank of the desulfurizing tower through a calcium sulfate dredge pump.
The invention also provides a desulfurization wastewater purification method based on the self-crystallization fluidized bed, which comprises the following steps: s10, outputting the desulfurization wastewater to a pipeline mixer containing calcium sulfate crystal circulating liquid, and mixing the desulfurization wastewater with a coagulant to obtain a first mixed solution; s20, outputting the first mixed solution to a reaction fluidized bed, mixing and circulating the first mixed solution and lime milk in a lime dissolving and metering tank in the reaction fluidized bed through a circulating pump, and outputting the first mixed solution purified by the reaction fluidized bed to the next treatment process; s30 calcium sulfate crystals generated by the reaction of sulfate ions of the first mixed solution and calcium ions in the lime milk in the reaction fluidized bed grow continuously through multiple cycles, and when the calcium sulfate crystals reach a certain concentration, the calcium sulfate crystals sink to a mud settling area of the reaction fluidized bed and are output to a gypsum slurry tank of the desulfurization tower.
Further, in the step S10, the coagulant in the coagulant adding device is output to the pipeline mixer through a metering pump controlled by frequency conversion.
Further, the step S20 further includes that a coagulant aid dosing device outputs a coagulant aid to an output end of the circulating pump, the lime milk in the step S20 is output to the output end of the circulating pump through a lime dissolving metering tank, and the lime powder in the lime powder bin is output to the lime dissolving metering tank through a lime metering device.
Further, the lime powder is at least one of quicklime or hydrated lime, and the coagulant aid is an anionic polymer coagulant aid.
Further, the calcium sulfate crystals precipitated in the step S30 are output to the gypsum slurry tank of the desulfurization tower through a calcium sulfate dredge pump.
Further, the coagulant is at least one of polyaluminium salt or ferric salt.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the desulfurization wastewater is mixed with the circulating liquid containing calcium sulfate crystals in the pipeline mixer and then output to the reaction fluidized bed, and then is mixed with the coagulant and the lime milk in the reaction fluidized bed, and the calcium sulfate crystals continuously grow up and sink through multiple cycles and are output to the gypsum slurry tank of the desulfurization tower, so that the desulfurization wastewater is purified, the treatment efficiency is high, the effect is good, the problem of scaling when the high-concentration sulfate radical part of the high-salt wastewater is removed can be effectively solved, and conditions are created for the subsequent treatment of the desulfurization wastewater.
Drawings
The technical solution and the advantages of the present invention will be apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a desulfurization waste water purification system based on a self-crystallizing fluidized bed according to an embodiment of the present invention;
FIG. 2 is a flow chart of a desulfurization waste water purification method based on a self-crystallizing fluidized bed according to an embodiment of the present invention.
Reference numbers in the figures:
1 pipeline mixer, 21 coagulant adding device, 22 metering pump, 31 reaction fluidized bed, 32 circulating pump, 41 lime dissolving metering box, 42 lime powder bin, 43 lime metering device, 51 desulfurizing tower gypsum slurry tank, 52 calcium sulfate mud discharging pump and 6 coagulant aid adding device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a desulfurization waste water clean system based on self-crystallizing fluidized bed, as shown in fig. 1, including line mixer 1, reaction fluidized bed 31, coagulant charge device 21, lime dissolve batch meter 41, desulfurizing tower gypsum slurry case 51 and coagulant aid charge device 6, desulfurization waste water exports to containing calcium sulfate crystal circulation liquid in line mixer 1, line mixer 1 with coagulant charge device 21 and reaction fluidized bed 31 are connected, reaction fluidized bed 31 is connected with circulating pump 32 and desulfurizing tower gypsum slurry case 51, lime dissolve batch meter 41 and coagulant aid charge device 6 export to the output of circulating pump 32.
The coagulant adding device 21 is connected with the pipeline mixer 1 through a metering pump 22 controlled by frequency conversion, the lime powder bin 42 is connected with the lime dissolving metering tank 41 through a lime metering device 43, and the reaction fluidized bed 31 is connected with a gypsum slurry tank 51 of the desulfurization tower through a calcium sulfate mud pump 52.
When the desulfurization wastewater purification system is used for the first time, calcium sulfate crystals are not contained in the pipeline mixer 1, and a proper amount of calcium sulfate crystals are required to be put into the pipeline mixer 1 for recycling.
The invention also provides a desulfurization wastewater purification method based on the self-crystallization fluidized bed, which comprises the following steps as shown in figure 2: and S10, outputting the desulfurization wastewater to a pipeline mixer 1 containing calcium sulfate crystal circulating liquid, and mixing the desulfurization wastewater with a coagulant to obtain a first mixed solution. S20 the first mixed liquid is delivered to the reaction fluidized bed 31, mixed and circulated in the reaction fluidized bed 31 with the lime milk in the lime dissolution measuring tank 41 by the circulation pump 32, and the first mixed liquid purified by the reaction fluidized bed 31 is delivered to the next treatment step. S30 calcium sulfate crystals generated by the reaction of sulfate ions of the first mixed solution and calcium ions in the lime milk in the reaction fluidized bed 31 grow continuously through multiple cycles, and when the calcium sulfate crystals reach a certain concentration, the calcium sulfate crystals sink to a mud settling area of the reaction fluidized bed 31 and are output to the gypsum slurry tank 51 of the desulfurization tower.
In the step S10, the coagulant in the coagulant adding device 21 is output to the line mixer 1 by the variable frequency controlled metering pump 22, and the coagulant is at least one of polyaluminium salt or ferric salt.
And the step S20 also comprises the step of outputting a coagulant aid to the output end of the circulating pump 32 by a coagulant aid dosing device 6, wherein the coagulant aid is an anionic polymer coagulant aid. The lime milk in the step S20 is output to the output end of the circulating pump 32 through the lime dissolving metering tank 41, and the lime powder in the lime powder bin 42 is output to the lime dissolving metering tank 41 through the lime metering device 43, wherein the lime powder is at least one of quicklime or hydrated lime.
And outputting the calcium sulfate crystals precipitated in the step S30 to a gypsum slurry tank 51 of the desulfurizing tower or dehydrating by a dehydrator through a calcium sulfate mud pump 52. The calcium sulfate sludge discharge pump 52 is a screw delivery pump or a slurry pump.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A desulfurization waste water purification system based on an auto-crystallization fluidized bed, comprising:
the desulfurization wastewater is output to the pipeline mixer containing the calcium sulfate crystal circulating liquid, and the pipeline mixer is connected with a coagulant dosing device and a reaction fluidized bed;
the reaction fluidized bed is further connected with a circulating pump and a gypsum slurry tank of the desulfurizing tower, and the lime dissolving metering tank outputs to the output end of the circulating pump.
2. The desulfurization wastewater purification system based on self-crystallizing fluidized bed as claimed in claim 1, further comprising a coagulant aid dosing device connected with the output end of the circulation pump.
3. The desulfurization waste water purification system based on self-crystallizing fluidized bed according to claim 1, wherein the coagulant dosing device is connected with the pipeline mixer through a metering pump controlled by frequency conversion; the lime powder bin is connected with the lime dissolving metering box through a lime metering device; the reaction fluidized bed is connected with the gypsum slurry tank of the desulfurizing tower through a calcium sulfate dredge pump.
4. A desulfurization wastewater purification method based on a self-crystallization fluidized bed is characterized by comprising the following steps:
s10, outputting the desulfurization wastewater to a pipeline mixer containing calcium sulfate crystal circulating liquid, and mixing the desulfurization wastewater with a coagulant to obtain a first mixed solution;
s20, outputting the first mixed solution to a reaction fluidized bed, mixing and circulating the first mixed solution and lime milk in a lime dissolving and metering tank in the reaction fluidized bed through a circulating pump, and outputting the first mixed solution purified by the reaction fluidized bed to the next treatment process;
s30 calcium sulfate crystals generated by the reaction of sulfate ions of the first mixed solution and calcium ions in the lime milk in the reaction fluidized bed grow continuously through multiple cycles, and when the calcium sulfate crystals reach a certain concentration, the calcium sulfate crystals sink to a mud settling area of the reaction fluidized bed and are output to a gypsum slurry tank of the desulfurization tower.
5. The desulfurization waste water purification method based on self-crystallizing fluidized bed as claimed in claim 4, wherein in the step S10, the coagulant in the coagulant adding device is output to the pipeline mixer through a metering pump controlled by frequency conversion.
6. The desulfurization wastewater purification method based on self-crystallizing fluidized bed as claimed in claim 4, wherein the step S20 further comprises a coagulant aid adding device for outputting coagulant aid to the output end of the circulation pump, the lime milk in the step S20 is outputted to the output end of the circulation pump through a lime dissolving metering tank, and the lime powder in the lime powder bin is outputted to the lime dissolving metering tank through a lime metering device.
7. The method for purifying desulfurization waste water based on self-crystallizing fluidized bed as claimed in claim 6, wherein said lime powder is at least one of quicklime or slaked lime, and said coagulant aid is anionic polymer coagulant aid.
8. The desulfurization waste water purification method based on self-crystallizing fluidized bed as claimed in claim 4, wherein the calcium sulfate crystals sinking in the step S30 are output to the gypsum slurry tank of the desulfurization tower through a calcium sulfate dredge pump.
9. The method for purifying desulfurization waste water based on self-crystallization fluidized bed as claimed in claim 4, wherein said coagulant is at least one of polyaluminium salt or ferric salt.
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Application publication date: 20210601 |