CN215161142U - A dechlorination sewage treatment system with heat recovery - Google Patents
A dechlorination sewage treatment system with heat recovery Download PDFInfo
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- CN215161142U CN215161142U CN202121468508.6U CN202121468508U CN215161142U CN 215161142 U CN215161142 U CN 215161142U CN 202121468508 U CN202121468508 U CN 202121468508U CN 215161142 U CN215161142 U CN 215161142U
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- 239000010865 sewage Substances 0.000 title claims abstract description 61
- 238000011084 recovery Methods 0.000 title claims abstract description 28
- 238000006298 dechlorination reaction Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000007921 spray Substances 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 27
- 238000005507 spraying Methods 0.000 abstract description 14
- 229910052801 chlorine Inorganic materials 0.000 abstract description 8
- 239000000460 chlorine Substances 0.000 abstract description 8
- 239000012153 distilled water Substances 0.000 abstract description 8
- 239000007789 gas Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 6
- 239000002918 waste heat Substances 0.000 abstract description 3
- 239000008235 industrial water Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 19
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 239000002351 wastewater Substances 0.000 description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000000909 electrodialysis Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- -1 fluorine ions Chemical class 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 241000605222 Acidithiobacillus ferrooxidans Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003957 anion exchange resin Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000382 dechlorinating effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The utility model discloses a dechlorination sewage treatment system with heat recovery, which comprises a spray concentration device, a first water storage chamber and a gas-liquid separator, wherein the first water storage chamber is communicated with a sewage source and comprises a first spray head, a first heat exchange pipe and a first inlet, a first outlet and a second outlet which are arranged in sequence from top to bottom; the spraying heat recovery device is connected with the second outlet and comprises a second spray head, a second heat exchange pipe and a second water storage chamber which are sequentially arranged from top to bottom, sewage with high chloride ion concentration is pumped to the first spray head through a first water pump and a spraying water circulating pipe, after the sewage is subjected to heat exchange with the first heat exchange pipe, gas-liquid mixed gas is separated and enters a gas-liquid separator, and then the heat of clean chlorine-free steam is subjected to heat exchange with the second heat exchange pipe again, so that the purpose of waste heat recycling is achieved. The system can dechlorinate high-chlorine sewage, the formed water vapor is recycled, and the condensed water forms distilled water which can be continuously used as industrial water.
Description
Technical Field
The utility model belongs to the sewage treatment field specifically is a dechlorination sewage treatment system with heat recovery.
Background
Chloride ion corrosion is commonly found in seawater, and different from general acid corrosion, the chloride ion has small radius, can penetrate through a conventional surface passivation film, and is a very strong passivator. Meanwhile, the chloride ions do not form corrosion products and are not consumed in corrosion, so that the catalyst plays a role of catalysis and can cause extremely serious corrosion problems for a long time.
Various kinds of sewage containing high-concentration chloride ions are also common in the chlor-alkali industry, the silicon chemical industry, the waste incineration and the biomass power plant. The process water in the coal-fired power plant is easy to enrich more chloride ions due to partial process and equipment reasons.
Chloride ion corrosion is not the same as chlorine corrosion. According to the guide of material selection of condenser tubes of thermal power plants, the chloride ion limit concentration of 316 stainless steel is 1000mg/L, the chloride ion limit concentration of 317 stainless steel is 5000mg/L, and the conventional stainless steel cannot be used in sewage with high chloride ion concentration for a long time.
For sewage with high chloride ion concentration, a plurality of treatment modes exist at present. At present, the following methods for removing chloride ions in wastewater are available: (1) the precipitation method, which uses silver nitrate to precipitate chloride ions, has high cost in industry and is not widely applied and is only used in laboratories; (2) the ion exchange method uses a compound bed or a mixed bed to remove chloride ions, belongs to the traditional process, has lower equipment investment and low operation cost, but anion exchange resin is easy to saturate and needs to be regenerated; (3) the electrodialysis method is suitable for treating low-concentration chlorine-containing wastewater, and has large water consumption and power consumption; (4) the reverse osmosis (RO membrane method) has higher removal rate than electrodialysis, is convenient to operate, but has larger investment, and the membrane is easy to block and is not suitable for treating wastewater with high conductivity and high ion concentration.
Chinese patent publication No. CN101121549 discloses a method for treating waste water containing ammonium and chlorine and recycling ammonium and chlorine, which comprises adding concentrated sulfuric acid to the waste water containing ammonium and chlorine, and then performing heating distillation to remove chloride ions, but the use of concentrated sulfuric acid is dangerous and not suitable for removing high-concentration chloride ions.
The Chinese patent with publication number CN107628687 discloses a treatment method for synchronously removing fluorine ions and chloride ions in industrial wastewater, which removes the fluorine ions and the chloride ions in the industrial wastewater by implementing a two-stage pretreatment and advanced treatment method; the pretreatment adopts Ca (OH)2And NaAlO2And (4) precipitating, wherein the advanced treatment adopts a biological coagulant for coagulation and precipitation. The bioflocculant disclosed in the patent is prepared from directionally domesticated thiobacillus ferrooxidans, has the advantages of no toxicity, high efficiency, no secondary pollution, natural degradation and the like, is treated by using an ultrahigh lime-aluminum method, but has extremely large medicament using amount, a large amount of useless precipitates exist after reaction, the treated water cannot be further utilized, and heat generated in the process of treating wastewater cannot be recovered.
Therefore, it is highly desirable to develop a system capable of dechlorinating the wastewater, avoiding generation of a large amount of precipitates, recovering process heat, and recycling the treated wastewater.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dechlorination sewage treatment system with heat recovery, this system can reduce the chloride ion in the sewage, can heat recovery to the in-process of handling waste water, and the distilled water that forms can reuse.
A dechlorination sewage treatment system with heat recovery, comprising:
the spray concentration device comprises a first spray head, a first heat exchange pipe and a first water storage chamber, wherein the first spray head, the first heat exchange pipe and the first water storage chamber are sequentially arranged from top to bottom, the first water storage chamber is communicated with a sewage source, the first spray head is connected with the first water storage chamber through a first water pump and a spray water circulating pipe, so that water in the first water storage chamber is pumped to the first spray head, and steam is introduced into the first heat exchange pipe so as to generate steam through water heat exchange sprayed by the first spray head;
the gas-liquid separator comprises a first inlet, a first outlet and a second outlet, the first inlet is communicated with the spray concentration device through a first communicating pipe, water vapor generated by heat exchange enters the gas-liquid separator through the first inlet, and the first outlet is connected with the spray water circulating pipe through a water return pipe so that water separated by the gas-liquid separator flows back to the spray concentration device;
the spraying heat recovery device is connected with the second outlet and comprises a second spray head, a second heat exchange pipe and a second water storage chamber which are sequentially arranged from top to bottom, the second spray head is connected with the second water storage chamber through a second water pump and a spraying water circulating pipe, so that water in the second water storage chamber is pumped to the second spray head, and heat supply network water is introduced into the second heat exchange pipe so as to exchange water heat sprayed by the second spray head.
The sewage with high chloride ion concentration is pumped to the first spray head through the first water pump and the spray water circulating pipe, gas-liquid mixed gas is separated after heat exchange with the first heat exchange pipe, then the gas-liquid mixed gas enters the gas-liquid separator for water-gas separation, and heat exchange is carried out again at the second heat exchange pipe by utilizing the heat of the separated clean chlorine-free steam, so that the purpose of waste heat recycling is achieved.
After heat exchange by utilizing the first heat exchange tube, chloride ions are precipitated in the first water storage chamber in a solid form, liquid in separated gas-liquid mixed gas flows back, heat exchange with the first heat exchange tube is continued, steam is concentrated, circulation is carried out, distilled water is finally obtained, and the distilled water enters the spraying heat recovery device and is dechlorinated steam, corrosion of the chloride ions to the spraying heat recovery device is prevented, after multiple cycles, high-concentration sewage in the first water storage chamber is treated, the concentration higher than 5000ppm and the like can be used for concentration unsuitable for steel work, the concentration is optimal above 10000, and the low concentration can lead to steam consumption increase.
The water vapor separated by the gas-liquid separator passes through the second heat exchange tube for heat exchange, the heat of the water vapor can be recycled under the auxiliary action of the spraying device, and the condensed water vapor forms distilled water which is convenient to reuse as process water.
Further, one end of the first communication pipe is connected between the first reservoir chamber and the first heat exchange pipe.
The water vapor is separated from the liquid drops carried out by the water vapor, so that chloride ions are prevented from being carried into the next stage, and meanwhile, the liquid drops are prevented from interfering the heat exchange of the next stage.
Further, one end of the second communication pipe is connected between the second heat exchange pipe and the second reservoir chamber.
The proper position of the second outlet can strengthen the heat transfer process of the steam and the heat exchange tube, improve the temperature of the backwater of the heat supply network and improve the heat quality.
Further, first heat exchange pipe includes steam inlet and comdenstion water export, steam inlet is located the below of comdenstion water export, furtherly, steam inlet is located the below of comdenstion water export, the sewage liquid level top of first reservoir chamber. Because of the countercurrent heat exchange, the high temperature difference and the heat transfer effect are kept, and the speed of evaporating the sewage into water vapor can be improved.
Further, the first heat exchange tube is a metal tube or a ceramic tube, and further preferably, the first heat exchange tube is a ceramic tube, and the metal tube is a corrosion-resistant steel tube or a titanium tube.
The ceramic pipe can prevent the corruption of high chlorine sewage, and the steam that gets into in the first heat exchange pipe has higher temperature, can realize great heat transfer difference in temperature to compensate the poor problem of ceramic pipe coefficient of heat conduction.
Further, the second heat exchange tube comprises a water feeding port and a water outlet, and the water feeding port is positioned above the water outlet.
Furthermore, the spray concentration device is provided with a sewage inlet which is positioned at the lower part of the first water storage chamber and is communicated with the sewage source; the spraying concentration device is also provided with a sewage outlet which is positioned at the lower part of the first water storage chamber.
Furthermore, a clean water outlet is formed in the lower portion of the second water storage chamber and connected with a post-treatment device.
The dechlorinated distilled water flows into other industrial devices through a clear water outlet for secondary utilization.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the high chlorine sewage is circularly dechlorinated through a spray concentration device until the distilled water is discharged and reused.
(2) Through spraying heat recovery unit, carry out heat recovery with the vapor of vapour and liquid separator input and recycle, the water that condenses down forms distilled water, can continue to use as industrial water.
(3) Liquid water separated in the gas-liquid separator enters the spraying concentration device for cyclic dechlorination, and water vapor enters the spraying heat recovery device for recycling and simultaneously can avoid corrosion pollution of chloride ions to the spraying heat recovery device.
Drawings
FIG. 1 is a block diagram of a dechlorination sewage treatment system with heat recovery.
Conforming to the following representation: 100-a spray concentration device, 110-a first spray head, 120-a first heat exchange pipe, 121-a condensed water outlet, 122-a steam inlet 130-a first water storage chamber, 140-a first water pump, 150-a spray water circulating pipe, 160-a sewage outlet, 170-a sewage inlet, 200-a gas-liquid separator, 210-a first communicating pipe, 220-a water return pipe and 230-a second communicating pipe; 300-a spray heat recovery device, 310-a second nozzle, 320-a second heat exchange pipe, 321-a water supply port, 322-a water outlet, 330-a second water storage chamber, 340-a second water pump, 350-a spray water circulating pipe, 360-a clear water outlet, 400-a sewage treatment device, 500-a sewage source and 600-a post-treatment device.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The dechlorination sewage treatment system with heat recovery of this embodiment, as shown in fig. 1, includes: the spray concentration device 100 comprises a first spray head 110, a first heat exchange pipe 120 and a first water storage chamber 130 communicated with a sewage source 500, which are arranged in sequence from top to bottom, wherein the first spray head 110 is connected with the first water storage chamber 130 through a first water pump 140 and a spray water circulation pipe 150, so that water in the first water storage chamber 130 is pumped to the first spray head 110, and steam is introduced into the first heat exchange pipe 120 so as to exchange water heat sprayed by the first spray head 110 to generate steam;
a gas-liquid separator 200 including a first inlet, a first outlet and a second outlet, wherein the first inlet is communicated with the spray concentration device 100 through a first communication pipe 210, the water vapor generated by the heat exchange enters the gas-liquid separator 200 through the first inlet, and the first outlet is connected with the spray water circulation pipe 150 through a return pipe 220, so that the water separated by the gas-liquid separator 200 flows back to the spray concentration device 100;
the spray heat recovery device 300 is connected to the second outlet through a second communicating pipe 230, and includes a second nozzle 310, a second heat exchanging pipe 320, and a second water storage chamber 330, which are sequentially arranged from top to bottom, wherein the second nozzle 310 is connected to the second water storage chamber 330 through a second water pump 340 and a spray water circulating pipe 350, so that water in the second water storage chamber 330 is pumped to the second nozzle 310, and heat exchange water sprayed from the second nozzle 310 flows through a heat supply network water in the second heat exchanging pipe 320;
the sewage with high chloride ion concentration is pumped to the first nozzle 110 through the first water pump 140 and the spray water circulating pipe 150, and after heat exchange with the first heat exchange pipe 120, gas-liquid mixed gas is separated and enters the gas-liquid separator 200, and then heat exchange is carried out again between the heat of clean chlorine-free steam and the second heat exchange pipe 320, so that the purpose of waste heat recycling is achieved.
One end of the first communication pipe 210 is connected between the first reservoir chamber 130 and the first heat exchange pipe 120.
One end of the second communication pipe 230 is connected between the second heat exchanging pipe 320 and the second storage compartment 330.
The first heat exchange tubes 120 include a steam inlet 122 and a condensed water outlet 121, and the steam inlet 122 is located below the condensed water outlet 121.
The first heat exchange tubes 120 are ceramic tubes.
The second heat exchange tube comprises a water feeding port 321 and a water outlet 322, and the water feeding port 321 is positioned above the water outlet 322.
The spray concentration device 100 is provided with a sewage inlet 170, and the sewage inlet 170 is positioned at the lower part of the first water storage chamber and is communicated with the sewage source 500; the spraying concentration device is further provided with a sewage outlet 160, the sewage outlet 160 is connected with a sewage treatment device 400, and the sewage outlet is positioned at the lower part of the first water storage chamber. The sewage is continuously separated by the spraying concentration device 100, clean water vapor enters the next procedure, and the concentrated chloride ions are gathered to a certain concentration and are treated by the sewage treatment device 400, so that the device has higher working efficiency and saves energy consumption.
The lower part of the second water storage chamber is provided with a clear water outlet 360, and the clear water outlet 360 is connected with a post-treatment device 600. So that the treated distilled water can be reused.
The specific operation mode is as follows: saturated steam of 3bar was fed at 5.21t/h into the first heat exchange tube, high concentration sewage was discharged from the sewage outlet at 0.31t/h to treat sewage of 6t/h and a chloride ion concentration of 10000mg/L, and 5.96t/h of heat net water (0.6MPa) was heated from 50 ℃ to 80 ℃. Finally, 11.17t/h hot water is obtained for supplying heat.
Claims (8)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121468508.6U CN215161142U (en) | 2021-06-30 | 2021-06-30 | A dechlorination sewage treatment system with heat recovery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121468508.6U CN215161142U (en) | 2021-06-30 | 2021-06-30 | A dechlorination sewage treatment system with heat recovery |
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| Publication Number | Publication Date |
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| CN215161142U true CN215161142U (en) | 2021-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321253A (en) * | 2021-06-30 | 2021-08-31 | 浙江大学 | Dechlorination sewage treatment system with heat recovery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321253A (en) * | 2021-06-30 | 2021-08-31 | 浙江大学 | Dechlorination sewage treatment system with heat recovery |
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