CN217051907U - System for eliminating chloride ions in desulfurization wastewater - Google Patents
System for eliminating chloride ions in desulfurization wastewater Download PDFInfo
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- CN217051907U CN217051907U CN202220785768.4U CN202220785768U CN217051907U CN 217051907 U CN217051907 U CN 217051907U CN 202220785768 U CN202220785768 U CN 202220785768U CN 217051907 U CN217051907 U CN 217051907U
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Abstract
The utility model provides a system for eliminating chloride ions in desulfurization wastewater, which belongs to the technical field of desulfurization wastewater treatment and comprises a first electrolytic reaction unit, a chlorine absorption unit and a recovery system; the first electrolysis reaction unit comprises a first electrolysis device and a first gas-liquid separation device which are sequentially connected with the pretreatment tank, the first electrolysis device is used for electrolyzing the desulfurization wastewater to generate hypochlorite and chlorine, and the first gas-liquid separation device is used for separating the hypochlorite and the chlorine; the chlorine absorption unit comprises an absorption device connected with the first gas-liquid separation device, and the absorption device is filled with a solution containing hydroxide ions for absorbing chlorine and generating high-concentration hypochlorite; the recovery system is connected with the first gas-liquid separation device and is used for recovering hypochlorite in the first gas-liquid separation device. The utility model provides a desulfurization waste water chloride ion elimination system has simplified desulfurization treatment process, gets rid of the investment and the operation cost of processing links such as evaporation, has reduced desulfurization waste water's treatment cost.
Description
Technical Field
The utility model belongs to the technical field of desulfurization waste water treatment, more specifically say, relate to a desulfurization waste water chloride ion elimination system.
Background
The wet flue gas desulfurization has the problem of waste water treatment, wherein the chloride ion treatment is a recognized problem at present, the concentration of chloride ions in the waste water is high, and after the waste water is recycled, the concentration of the chloride ions in the water is far higher than the tolerance limit of a related pipe to the corrosion of the chloride ions, and only the discharge can be treated. After the wastewater is subjected to precipitation treatment in the pretreatment tank, solid waste such as sludge can be formed only in an evaporation mode for retreatment, and the treatment cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a desulfurization waste water chloride ion elimination system aims at improving the dechlorination effect of desulfurization waste water, simplifies dechlorination processing technology.
In order to achieve the above object, the utility model adopts the following technical scheme: provided is a system for eliminating chloride ions in desulfurization waste water, comprising:
the first electrolysis reaction unit comprises a first electrolysis device and a first gas-liquid separation device which are sequentially connected with the pretreatment tank, the first electrolysis device is used for electrolyzing the desulfurization wastewater to generate hypochlorite and chlorine, and the first gas-liquid separation device is used for separating the hypochlorite and the chlorine;
the chlorine absorption unit comprises an absorption device connected with the first gas-liquid separation device, and the absorption device is filled with a solution containing hydroxide ions for absorbing chlorine and generating high-concentration hypochlorite;
and the recovery system is connected with the first gas-liquid separation device and is used for recovering hypochlorite in the first gas-liquid separation device.
As another embodiment of the present application, the method further includes:
the second electrolysis reaction unit is connected with the first electrolysis reaction unit in parallel and comprises a second electrolysis device and a second gas-liquid separation device, the second electrolysis device is connected with the pretreatment tank, and the second gas-liquid separation device is connected with the recovery device and the absorption device.
As another embodiment of the present application, a communicating pipe is disposed between the first gas-liquid separation device and the second electrolysis device.
As another embodiment of the application, the first electrolysis unit and the second electrolysis unit are both membraneless electrolysis cells, and electrolysis closed cavities are arranged in the membraneless electrolysis cells and are provided with exhaust pipes.
As another embodiment of the present application, the absorption device is connected to the solution replenishing device, and the solution replenishing device is used for replenishing a solution containing hydroxide ions into the absorption device.
As another embodiment of the present application, the absorption apparatus includes a tank, and an intake pipe, a liquid inlet pipe, a liquid outlet pipe, and an exhaust pipe disposed on the tank, where the intake pipe connects the first gas-liquid separation apparatus and the second gas-liquid separation apparatus; the liquid inlet pipe is connected with the liquid supplementing device; the liquid discharge pipe is connected with a storage device; the exhaust pipe is connected with a discharge device.
As another embodiment of the present application, a packing layer is disposed in the tank.
The utility model provides a desulfurization waste water chloride ion elimination system's beneficial effect lies in: compared with the prior art, the system for eliminating the chloride ions in the desulfurization wastewater simplifies the desulfurization treatment process, removes the investment and operation cost of treatment links such as evaporation and the like, and reduces the treatment cost of the desulfurization wastewater; and the system makes the desulfurization waste water simple and changes the desulfurization waste water into valuables, and has wide social and economic benefits.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic system diagram of a system for eliminating chloride ions from desulfurization wastewater provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first electrolysis apparatus provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an absorption device according to an embodiment of the present invention.
In the figure: 1. a pretreatment pool; 2. a water pump; 3a, a first electrolysis device; 3b, a second electrolysis device; 4a, a first gas-liquid separation device; 4b, a second gas-liquid separation device; 5. a recovery device; 6. an absorption device; 7. A liquid supplementing device; 8. a discharge device; 9. a storage device; 10. a membraneless electrolytic cell; 11. a reaction tank; 12. a metal electrode; 13. a power supply module; 14. a liquid inlet pipe; 15. a liquid discharge pipe; 16. an exhaust pipe; 20. a tank body; 21. A packing layer; 22. a liquid through pipe; 23. a breather pipe; 24. a delivery pipe; 25. and a discharge pipe.
Detailed Description
In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention more clearly understood, the following description is made in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 3, a chloride ion eliminating system for desulfurization waste water according to the present invention will now be described. The system for eliminating the chloride ions in the desulfurization wastewater comprises a first electrolysis reaction unit, a chlorine absorption unit and a recovery system; the first electrolysis reaction unit comprises a first electrolysis device 3a and a first gas-liquid separation device 4a which are sequentially connected with the pretreatment tank 1, the first electrolysis device 3a is used for electrolyzing the desulfurization wastewater to generate hypochlorite and chlorine, and the first gas-liquid separation device 4a is used for separating the hypochlorite and the chlorine; the chlorine absorption unit comprises an absorption device 6 connected with the first gas-liquid separation device 4a, and the absorption device 6 is filled with a solution containing hydroxide ions for absorbing chlorine and generating high-concentration hypochlorite; the recovery system is connected with the first gas-liquid separation device 4a and is used for recovering hypochlorite in the first gas-liquid separation device 4 a.
Compared with the prior art, the system for eliminating the chloride ions in the desulfurization wastewater utilizes the electrolysis principle to convert the chloride ions in the pretreated desulfurization wastewater into hypochlorite and chlorine, wherein the hypochlorite is dissolved in the original water body and is recovered by the recovery system, and the hypochlorite is used for sterilizing and algae killing of a circulating water system and a water replenishing system so as to save the purchase of an oxidizing bactericide; the chlorine is absorbed by the absorption device 6 and reacts with the hydroxide ions in the absorption device 6 to generate a high-concentration sodium hypochlorite solution. The system for eliminating the chloride ions in the desulfurization wastewater simplifies the desulfurization treatment process, removes the investment and operation cost of treatment links such as evaporation and the like, and reduces the treatment cost of the desulfurization wastewater; and the system makes the desulfurization waste water simple and changes the desulfurization waste water into valuables, and has wide social and economic benefits.
Optionally, pretreatment tank 1 is the sedimentation tank, and pretreatment tank 1 is after stewing, has sediment and impurity, is provided with filter equipment in pretreatment tank 1 to the sediment of discharging and impurity.
Optionally, the absorption device 6 is connected with a storage device 9 for storing a high-concentration sodium hypochlorite solution.
Optionally, a water pump 2 is arranged between the pretreatment tank 1 and the first electrolysis unit, and the water pump 2 conveys the water in the pretreatment tank 1 to the first electrolysis unit.
Optionally, the hydroxide ion solution is sodium hydroxide solution.
Optionally, the recycling system comprises a recycling device 5 for recycling the sodium hypochlorite solution.
In some possible embodiments, referring to fig. 1, the system for eliminating chloride ions from desulfurization wastewater further comprises a second electrolysis reaction unit, the second electrolysis reaction unit is arranged in parallel with the first electrolysis reaction unit, the second electrolysis reaction unit comprises a second electrolysis device 3b and a second gas-liquid separation device 4b, the second electrolysis device 3b is connected with the pretreatment tank 1, and the second gas-liquid separation device 4b is connected with the recovery device 5 and the absorption device 6.
Specifically, the second electrolysis reaction unit is connected with the first electrolysis reaction unit in parallel, and the second electrolysis reaction unit and the first electrolysis reaction unit alternately run, so that the working time is saved, and the working efficiency is improved.
When the first electrolytic reaction unit works, a pipeline between the pretreatment tank 1 and the first electrolytic device 3a is closed by a valve, a pipeline between the pretreatment tank 1 and the second electrolytic device 3b is communicated by a valve, and liquid in the pretreatment tank 1 enters the second electrolytic device 3 b; after the first electrolysis reaction unit finishes electrolysis, the opening and closing states of the two valves are switched, the liquid in the second electrolysis device 3b is electrolyzed, and the liquid in the pretreatment tank 1 enters the first electrolysis device 3a which is empty.
Optionally, the liquid in the first electrolysis device 3a and the second electrolysis device 3b is completed in the electrolysis process; and (c) and (d).
The electrolyzed liquid contains NaClO to form a dilute sodium hypochlorite solution, and the sodium hypochlorite solution obtained by the reaction is recycled and can be used for sterilization and algae killing in make-up water or circulating water. The recycling of the sodium chlorate solution saves the acquisition cost of the oxidizing bactericide.
Optionally, the first gas-liquid separation device 4a and the second gas-liquid separation device 4b are respectively located at outlet sides of the first electrolysis device 3a and the second electrolysis device 3b, and are used for separating ionized hydrogen and chlorine from the solution; and increasing the concentration of the sodium hypochlorite solution.
There is also a reaction in which hydroxide ions and heavy metal ions form precipitates during electrolysis.
In some possible embodiments, referring to fig. 1, a communicating pipe is arranged between the first gas-liquid separation device 4a and the second electrolysis device 3 b.
Specifically, a communicating pipe is connected to the first gas-liquid separation device 4a and the second electrolysis device 3b, and an on-off valve is arranged on the communicating pipe. The communicating pipe is used for realizing the series connection of the first electrolysis reaction unit and the second electrolysis reaction unit so as to ensure the electrolysis degree of the desulfurization wastewater.
In some possible embodiments, referring to fig. 2, the first electrolyzer 3a and the second electrolyzer 3b are both membraneless electrolyzers 10, and the membraneless electrolyzer 10 has an electrolysis closed chamber therein, and the electrolysis closed chamber is provided with an exhaust pipe 16.
Specifically, the first electrolysis device 3a and the second electrolysis device 3b both adopt a membraneless electrolysis cell 10, an electrolysis closed cavity is arranged in the membraneless electrolysis cell 10, and the electrolysis closed cavity is provided with a liquid inlet pipe 14, a liquid outlet pipe 15 and an exhaust pipe 16; wherein the liquid inlet pipe 14 is connected with the pretreatment tank 1, and the liquid discharge pipe 15 and the exhaust pipe 16 are both connected with the corresponding gas-liquid separation device. A metal electrode 12 is arranged in the electrolysis closed cavity, and the metal electrode 12 is connected with a power module 13.
Optionally, the liquid inlet pipe 14 and the liquid outlet pipe 15 are both connected to the lower part of the electrolysis closed cavity, and the two pipelines are switched to be opened. An exhaust pipe 16 is connected to the upper part of the electrolysis enclosure.
Optionally, the other end of the liquid discharge pipe 15 is connected to the lower part of the gas-liquid separation device; the other end of the exhaust pipe 16 is connected with the bottom of the gas-liquid separation device, the joint of the exhaust pipe 16 and the gas-liquid separation device is positioned below the liquid discharge pipe 15, and gas enters the solution, passes through the solution and is discharged from the gas outlet of the gas-liquid separation device.
Optionally, a reaction tank 11 with a downward opening is arranged inside the electrolysis closed cavity, the two metal electrodes 12 both extend into the reaction tank 11, and a gap exists between the bottom end of the reaction tank 11 and the bottom of the electrolysis closed cavity. The metal electrode 12 is energized and reacts in the reaction vessel 11, and gas generated by the reaction overflows from the reaction vessel 11 through the gap.
In some possible embodiments, the absorption device 6 is further connected to a solution replenishing device 7, and the solution replenishing device 7 is used for containing a solution containing hydroxide ions, such as a sodium hydroxide solution. The liquid replenishing device 7 is used for replenishing hydroxide ions into the absorption device 6.
The absorption device 6 comprises a tank 20, and a vent pipe 23, a liquid through pipe 22, a delivery pipe 24 and a discharge pipe 25 which are arranged on the tank 20, wherein the vent pipe 23 is connected with the first gas-liquid separation device 4a and the second gas-liquid separation device 4 b; the liquid through pipe 22 is connected with the liquid supplementing device 7; the conveying pipe 24 is connected with a storage device 9; the discharge pipe 25 is connected with a discharge device 8.
Optionally, the hydroxide solution is sodium hydroxide solution. Chlorine and the dilute sodium hydroxide solution react at a low temperature to generate sodium hypochlorite, sodium chloride and water to form high-concentration sodium hypochlorite. The generated sodium hypochlorite solution with high concentration is stored in the storage device 9, so that other commercial purposes can be realized.
Chlorine gas enters the absorption device 6 from the gas-liquid separation device through the vent pipe 23, the vent pipe 23 is arranged at the lower part of the tank body 20, the liquid through pipe 22 is arranged at the upper part of the tank body 20, and the solution containing hydroxide ions enters the absorption device 6 from the liquid supplementing device 7 through the liquid through pipe 22. Taking sodium hydroxide as an example, chlorine gas reacts with sodium hydroxide solution to generate sodium hypochlorite solution with high concentration. The sodium hypochlorite solution with high solubility enters the storage device 9 through the conveying pipe 24; the impurity gases in the chlorine gas enter the discharge device 8 through the discharge pipe 25.
A packing layer 21 is arranged in the tank body 20, air-permeable pores are arranged in the packing layer 21, and chlorine and sodium hydroxide solution react in the air-permeable pores in the packing layer 21 to generate sodium hypochlorite solution; the resulting sodium hypochlorite solution fell along the packing.
Optionally, the filler layer 21 may be a ceramic filler.
Optionally, the absorption device 6 is further connected to a discharge device 8 for discharging impurities such as gas or discharging liquid after the reaction is finished.
Taking the desulfurization wastewater of a certain power plant as an example, the concentration of chloride ions is 14000mg/L, and the amount of the wastewater is 10m 3 H is used as the reference value. The water supplement amount of the plant circulating water is 1300m 3 The raw water chloride ion concentration was 45 mg/l.
The chlorine ion concentration of the dechlorinated wastewater is assumed to reach 3000 mg/l. Can form 10m of recyclable wastewater containing about 300mg/l of available chlorine 3 H (namely, bactericide containing 3kg/h of available chlorine), and the reuse of the wastewater can omit the outsourcing oxidationThe bactericide realizes the sterilization and algae removal of circulating water or a water supply system. Another 15000mg/l of chlorine was used for the production of hypochlorite in high concentration.
The hardness and heavy metal ions in the water precipitated by hydroxide ions are about 2500mol or more.
The direct economic benefits of adopting the system to eliminate chloride ions are as follows: can realize 10m 3 The recycling of the wastewater per hour saves 30 kg/hour (10 percent sodium hypochlorite solution) and produces 1.1 ton/hour of 10 percent high-purity sodium hypochlorite solution.
Therefore, the utility model provides a desulfurization waste water chloride ion elimination system has extensive social and economic benefits.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. Desulfurization waste water chloride ion elimination system, its characterized in that includes:
the first electrolysis reaction unit comprises a first electrolysis device and a first gas-liquid separation device which are sequentially connected with the pretreatment tank, the first electrolysis device is used for electrolyzing the desulfurization wastewater to generate hypochlorite and chlorine, and the first gas-liquid separation device is used for separating the hypochlorite and the chlorine;
the chlorine absorption unit comprises an absorption device connected with the first gas-liquid separation device, and the absorption device is filled with a solution containing hydroxide ions for absorbing chlorine and generating high-concentration hypochlorite;
and the recovery system is connected with the first gas-liquid separation device and is used for recovering hypochlorite in the first gas-liquid separation device.
2. The system for eliminating chloride ions from desulfurization waste water according to claim 1, further comprising:
the second electrolysis reaction unit is connected with the first electrolysis reaction unit in parallel and comprises a second electrolysis device and a second gas-liquid separation device, the second electrolysis device is connected with the pretreatment tank, and the second gas-liquid separation device is connected with the recovery device and the absorption device.
3. The desulfurization waste water chloride ion elimination system of claim 2, wherein a communication pipe is provided between the first gas-liquid separation device and the second electrolysis device.
4. The system for eliminating chloride ions from desulfurization waste water according to claim 3, wherein said first electrolysis device and said second electrolysis device are both membrane-free electrolysis cells, and said membrane-free electrolysis cells are provided with electrolysis closed cavities therein, and said electrolysis closed cavities are provided with exhaust pipes.
5. The system for eliminating chloride ions from desulfurization waste water according to claim 2, wherein said absorption unit is connected to a solution replenishing means for replenishing a solution containing hydroxide ions into said absorption unit.
6. The desulfurization waste water chloride ion elimination system of claim 5, wherein the absorption device comprises a tank body, a vent pipe and a liquid through pipe which are arranged on the tank body, and the vent pipe is connected with the first gas-liquid separation device and the second gas-liquid separation device; the liquid through pipe is connected with the liquid supplementing device; the breather pipe is positioned below the liquid through pipe.
7. The system for eliminating chloride ions in desulfurization waste water according to claim 6, wherein a packing layer is provided in said tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220785768.4U CN217051907U (en) | 2022-04-06 | 2022-04-06 | System for eliminating chloride ions in desulfurization wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220785768.4U CN217051907U (en) | 2022-04-06 | 2022-04-06 | System for eliminating chloride ions in desulfurization wastewater |
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| CN217051907U true CN217051907U (en) | 2022-07-26 |
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| CN202220785768.4U Active CN217051907U (en) | 2022-04-06 | 2022-04-06 | System for eliminating chloride ions in desulfurization wastewater |
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