CN110745893A - System and method for preventing drying tower from scaling and corroding in wastewater evaporation process - Google Patents
System and method for preventing drying tower from scaling and corroding in wastewater evaporation process Download PDFInfo
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- CN110745893A CN110745893A CN201911191593.3A CN201911191593A CN110745893A CN 110745893 A CN110745893 A CN 110745893A CN 201911191593 A CN201911191593 A CN 201911191593A CN 110745893 A CN110745893 A CN 110745893A
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- drying tower
- wastewater
- pipeline
- adherence
- air
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- 238000001035 drying Methods 0.000 title claims abstract description 86
- 239000002351 wastewater Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001704 evaporation Methods 0.000 title claims abstract description 25
- 230000008020 evaporation Effects 0.000 title claims abstract description 24
- 238000000889 atomisation Methods 0.000 claims abstract description 16
- 238000005260 corrosion Methods 0.000 claims abstract description 14
- 230000007797 corrosion Effects 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 27
- 230000001464 adherent effect Effects 0.000 claims description 22
- 238000009692 water atomization Methods 0.000 claims description 7
- 239000008187 granular material Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000001694 spray drying Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/042—Prevention of deposits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
-
- 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
- Y02A20/138—Water desalination using renewable energy
- Y02A20/141—Wind power
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a system and a method for preventing scaling corrosion of a drying tower in a wastewater evaporation process, wherein the outlet of a high-temperature heat source pipeline is divided into two paths, wherein one path is communicated with the inlet of the bypass adherence air pipeline, the other path is communicated with the inlet of the atomization device, the atomization device is arranged at the top of the drying tower and communicated with the top of the drying tower, the wastewater atomization nozzle is positioned in the drying tower and positioned below the rotational flow atomization device, the wastewater conveying pipeline is communicated with the inlet of the wastewater atomization nozzle, the inner wall of the top of the drying tower is provided with an adherence air system, the inlet of the adherence air system is communicated with the outlet of the bypass adherence air pipeline, the bottom particle outlet of the drying tower is connected with an ash bucket, the side surface of the bottom of the drying tower is provided with a heat source outlet, the system can effectively prevent the scale formation and corrosion phenomenon on the inner wall of the drying tower caused by the attachment of the fog drops of the wastewater to the wall surface of the drying tower.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection, and relates to a system and a method for preventing a drying tower from scaling and corroding in a wastewater evaporation process.
Background
In the production of the industries such as thermal power, chemical industry, medicine and the like, waste water is often discharged periodically to ensure the normal operation of an industrial system. With the tightening of national environmental protection policies and the requirements on zero discharge of wastewater in various industries, the wastewater evaporation process is taken as the main wastewater treatment means at present, and the main technical routes are an evaporation crystallization technology, a bypass spray drying evaporation technology, a main flue evaporation technology and the like.
The working flow of the conventional bypass spray drying evaporation technology is as follows: firstly, supplementing the wastewater into an atomization device through a wastewater inlet at the upper part of a drying tower, mixing and atomizing the desulfurization wastewater and high-temperature hot fluid through the atomization device, and then, evaporating and exchanging heat in the drying tower.
The diameter of the tower body of the drying tower is usually designed to be larger than the spraying diameter of a waste water nozzle (the diameter of an atomizing cone corresponding to a section of 0.9m below the nozzle), the economic efficiency of the drying tower is influenced by the overlarge tower diameter of the drying tower, and the reliability of equipment is influenced by potential safety hazards such as corrosion and scaling caused by the undersize tower diameter.
The bypass spray drying evaporation technology has the advantages of small investment, low operation cost, high reliability and the like, and is gradually popularized and popularized in the wastewater treatment industry, however, the spray drying tower causes serious adherent contamination corrosion phenomena due to factors such as type selection, operation control, non-uniform spraying, unstable atomizing pressure and the like in the application process, huge hidden dangers are caused to the continuous treatment of wastewater, and the service life of equipment and the safety of industrial production are seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for preventing the drying tower from scaling and corroding in the wastewater evaporation process, wherein the system can effectively prevent the phenomenon that the inner wall of the drying tower is scaled and corroded because fog drops of wastewater adhere to the wall surface of the drying tower.
In order to achieve the aim, the system for preventing the drying tower from scaling and corroding in the wastewater evaporation process comprises a high-temperature heat source pipeline, a bypass adherence air pipeline, an atomizing device, the drying tower, a wastewater atomizing nozzle and a wastewater conveying pipeline;
the export of high temperature heat source pipeline is divided into two the tunnel, wherein, is linked together with the entry of bypass adherence wind pipeline all the way, and another way is linked together with atomizing device's entry, atomizing device sets up and is linked together in the top of drying tower and with the top of drying tower, and waste water atomizing nozzle is located the drying tower, and waste water atomizing nozzle is located atomizing device's below, and waste water conveying line is linked together with waste water atomizing nozzle's entry, is provided with adherence wind system on the inner wall at drying tower top, and adherence wind system's entry is linked together with the export of bypass adherence wind pipeline, and the bottom granule exit of drying tower is connected with the ash bucket, and the side at drying tower bottom is provided with the.
The outlet of the bypass adherence air pipeline is communicated with the inlet of the adherence air system through a booster fan.
The device also comprises a pneumatic conveying bin pump and an ash residue system, wherein the outlet of the ash hopper is communicated with the ash residue system through the pneumatic conveying bin pump.
The adherence wind system includes circumference shape spout, and wherein, each circumference shape spout sets up on the lateral wall at drying tower top along circumference.
The method for preventing the drying tower from scaling and corroding in the wastewater evaporation process comprises the following steps:
the high-temperature hot fluid output by the bypass high-temperature heat source pipeline is divided into two paths, one path of high-temperature hot fluid is sprayed into the drying tower through the atomizing device, the other path of high-temperature hot fluid enters the bypass adherent air pipeline as adherent air, the wastewater output by the wastewater conveying pipeline is sprayed into the drying tower through the wastewater atomizing nozzle, then is mixed and atomized with the high-temperature hot fluid output by the atomizing device, and is evaporated and subjected to heat exchange in the drying tower, the adherent air output by the adherent air system flows downwards along the inner wall of the drying tower, so that an adherent air protection area is formed on the inner wall of the drying tower, so that the fog drops of the wastewater are prevented from being attached to the inner wall of the drying tower, the hot fluid formed after the heat exchange between the high-temperature hot fluid and the wastewater and the adherent air flowing downwards along the inner wall of the drying tower.
The amount of the high-temperature fluid entering the bypass adherent air pipeline is 5-15% of the total amount in the high-temperature heat source pipeline.
The flow speed of wall attaching wind output by the wall attaching wind system is 15-25 m/s.
The invention has the following beneficial effects:
when the system for preventing the scaling corrosion of the drying tower in the wastewater evaporation process is specifically operated, the bypass adherence air pipeline leads out a path of high-temperature hot fluid from the high-temperature heat source pipeline to be used as adherence air after being pressurized, and the adherence air is input into the drying tower through the adherence air system and flows downwards along the inner wall of the drying tower, so that the wastewater is prevented from being sprayed and adhered to the inner wall of the drying tower, the scaling corrosion phenomenon of the inner wall of the drying tower is avoided, and the system has the advantages of simple structure, convenience in operation and strong practicability.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
fig. 2 is another schematic structural diagram of the present invention.
Wherein, 1 is a high-temperature heat source pipeline, 2 is a bypass adherence air pipeline, 3 is a booster fan, 4 is an atomizing device, 5 is a wastewater atomizing nozzle, 6 is a wastewater conveying pipeline, 7 is an adherence air protection area, 8 is a heat source outlet, 9 is an adherence air system, 10 is a drying tower, and 11 is an ash bucket.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for preventing scaling corrosion of a drying tower in a wastewater evaporation process according to the present invention includes a high temperature heat source pipeline 1, an adherent air pipeline 2, an atomization device 4, a drying tower 10, a wastewater atomization nozzle 5, and a wastewater delivery pipeline 6; the export of high temperature heat source pipeline 1 is divided into two the tunnel, wherein, is linked together with the entry of bypass adherence wind pipeline 2 all the way, and another way is linked together with atomizing device 4's entry, whirl atomizing device 4 sets up and is linked together in the top of drying tower 10 and with the top of drying tower 10, and waste water atomizing nozzle 5 is located whirl atomizing device 4's below, and waste water conveying pipeline 6 is linked together with waste water atomizing nozzle 5's entry, is provided with adherence wind system 9 on the inner wall at drying tower 10 top, and the entry of adherence wind system 9 is linked together with the export of bypass adherence wind pipeline 2, and the bottom granule exit of drying tower 10 is connected with ash bucket 11, and the side of drying tower 10 bottom is provided with heat source export 8.
The invention also comprises a pneumatic conveying bin pump and an ash system, wherein the outlet of the ash hopper 11 is communicated with the ash system through the pneumatic conveying bin pump; the outlet of the bypass adherence air pipeline 2 is communicated with the inlet of an adherence air system 9 through a booster fan 3.
The method for preventing the drying tower from scaling and corroding in the wastewater evaporation process comprises the following steps:
the high-temperature hot fluid output by the high-temperature heat source pipeline 1 is divided into two paths, wherein one path is sprayed into the drying tower 10 through the atomizing device 4, the other path is used as wall attaching wind to enter the bypass wall attaching wind pipeline 2, the wastewater output by the wastewater conveying pipeline 6 is sprayed into the drying tower 10 through the wastewater atomizing nozzle 5, and then is mixed and atomized with the high-temperature heat source output by the atomizing device 4, and the adherent wind output by the adherent wind system 9 flows downwards along the inner wall of the drying tower 10, therefore, an adherent wind protection area 7 is formed on the inner wall of the drying tower 10 to prevent the fog drops of the wastewater from attaching to the inner wall of the drying tower 10, the hot fluid formed after the heat exchange between the high-temperature hot fluid and the wastewater and the adherent wind flowing downwards along the inner wall of the drying tower 10 are finally discharged through a heat source outlet 8, and the solidified salt particles generated by the heat exchange between the high-temperature heat source and the wastewater fall into an ash hopper 11 and are finally discharged into an ash residue system through a pneumatic conveying bin pump.
The amount of the high-temperature fluid entering the bypass adherent air pipeline 2 is 5-15% of the total amount of the hot fluid in the high-temperature heat source pipeline 1; the flow speed of wall attaching air output by the wall attaching air system 9 is 4-6 times of the flow speed of waste water fog drops in the drying tower, namely within the range of 15-25 m/s.
Meanwhile, the high-temperature heat source is pressurized by the booster fan 3 and then is supplemented into the adherence air system 9, the adherence air system 9 comprises circumferential nozzles, the circumferential nozzles are arranged in the circumferential direction of the top of the drying tower 10 and are arranged along the inner wall of the drying tower 10, and the booster fan 3 is additionally arranged to improve the flow velocity of adherence air discharged by the adherence air system 9, namely the rigidity of adherence air is improved to form an adherence air protection area 7, so that the adherence air is ensured to form effective coverage on the wall surface of the drying tower 10.
The high-temperature hot fluid in the bypass high-temperature heat source pipeline 1 can be high-temperature hot fluid or air, and the hot fluid output from the heat source outlet returns to the original industrial pipeline for conventional flue gas environment-friendly treatment.
Fig. 2 is another specific implementation schematic diagram of the invention, high-temperature fluid in the bypass adherent air pipeline 2 can be replaced by high-pressure head hot fluid (flue gas or air, etc.), and a booster fan 3 is omitted, so that the aim of simplifying an adherent air system is fulfilled.
The significance of the invention is that the design tower diameter of the drying tower 10 is effectively reduced under the condition that the drying tower 10 meets the atomization, resource waste and poor investment economy caused by overlarge tower body are avoided, and the advantages of small occupied area and low investment of the drying tower 10 are ensured. Meanwhile, the phenomenon that the wall is seriously adhered with stain and corroded due to factors such as type selection, operation control, uneven spraying, unstable atomizing pressure and the like is avoided, the service life of the wastewater treatment device is influenced, and huge hidden dangers are caused to the continuous treatment of wastewater.
Claims (7)
1. A system suitable for preventing a drying tower from scaling and corroding in a wastewater evaporation process is characterized by comprising a high-temperature heat source pipeline (1), a bypass adherence air pipeline (2), a wastewater atomization device (4), a drying tower (10), a wastewater atomization nozzle (5) and a wastewater conveying pipeline (6);
the outlet of the high-temperature heat source pipeline (1) is divided into two paths, wherein one path is communicated with the inlet of the bypass adherence air pipeline (2), the other path is communicated with the inlet of the atomization device (4), atomizing device (4) set up in the top of drying tower (10) and be linked together with the top of drying tower (10), waste water atomizing nozzle (5) are located the below of atomizing device (4), waste water conveying pipeline (6) are linked together with the entry of waste water atomizing nozzle (5), be provided with adherence wind system (9) on the inner wall at drying tower (10) top, the entry of adherence wind system (9) is linked together with the export of bypass adherence wind pipeline (2), the bottom granule exit of drying tower (10) is connected with ash bucket (11), the side of drying tower (10) bottom is provided with heat source export (8).
2. The system for preventing the scaling corrosion of the drying tower in the evaporation process of the wastewater as claimed in claim 1, wherein the outlet of the bypass adherent air pipeline (2) is communicated with the inlet of the adherent air system (9) through a booster fan (3).
3. The system for preventing the scaling corrosion of the drying tower in the evaporation process of the wastewater as claimed in claim 1, further comprising a pneumatic conveying bin pump and an ash system, wherein the outlet of the ash hopper (11) is communicated with the ash system through the pneumatic conveying bin pump.
4. The system for preventing scaling corrosion of the drying tower in the evaporation process of wastewater as claimed in claim 1, wherein the adherent air system (9) comprises a circumferential nozzle, wherein the circumferential nozzle is circumferentially arranged on the side wall of the top of the drying tower (10).
5. A method for preventing the scaling corrosion of a drying tower in a wastewater evaporation process is characterized in that the system for preventing the scaling corrosion of the drying tower in the wastewater evaporation process is based on claim 1 and comprises the following steps:
the high-temperature thermal fluid output by the high-temperature heat source pipeline (1) is divided into two paths, wherein one path of the high-temperature thermal fluid is sprayed into the drying tower (10) through the cyclone atomization device (4), the other path of the high-temperature thermal fluid enters the bypass adherence air pipeline (2) as adherence air, the wastewater output by the wastewater conveying pipeline (6) is sprayed into the drying tower (10) through the wastewater atomization nozzle (5), then is mixed and atomized with the high-temperature thermal fluid output by the atomization device (4) and is evaporated and heat exchanged in the drying tower (10), the adherence air output by the adherence air system (9) flows downwards along the inner wall of the drying tower (10), so that an adherence air protection area (7) is formed on the inner wall of the drying tower (10) to prevent the adherence air droplets from attaching to the inner wall of the drying tower (10), the thermal fluid formed after the heat exchange between the high-temperature thermal fluid and the wastewater and the adherence air flowing downwards along the inner wall of the drying tower (, solidified salt particles generated by heat exchange between the high-temperature hot fluid and the wastewater fall into an ash bucket (11).
6. The method for preventing the scaling corrosion of the drying tower in the wastewater evaporation process according to claim 5, wherein the amount of the high-temperature hot fluid entering the bypass adherent air pipeline (2) is 5-15% of the total amount in the high-temperature heat source pipeline (1).
7. The method for preventing the scaling corrosion of the drying tower in the wastewater evaporation process as claimed in claim 5, wherein the flow velocity of the adherent wind output by the adherent wind system (9) is 15-25 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191593.3A CN110745893A (en) | 2019-11-28 | 2019-11-28 | System and method for preventing drying tower from scaling and corroding in wastewater evaporation process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191593.3A CN110745893A (en) | 2019-11-28 | 2019-11-28 | System and method for preventing drying tower from scaling and corroding in wastewater evaporation process |
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| CN110745893A true CN110745893A (en) | 2020-02-04 |
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| CN201911191593.3A Pending CN110745893A (en) | 2019-11-28 | 2019-11-28 | System and method for preventing drying tower from scaling and corroding in wastewater evaporation process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142143A (en) * | 2020-10-14 | 2020-12-29 | 南京依涛环保科技有限公司 | System and method for removing heavy metal and chloride ions in evaporative crystallization process of desulfurization wastewater |
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| CN106745436A (en) * | 2017-02-28 | 2017-05-31 | 山东大学 | A kind of utilization low temperature bypass flue gas concentrates the system and method for brine waste |
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-
2019
- 2019-11-28 CN CN201911191593.3A patent/CN110745893A/en active Pending
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| CN1895748A (en) * | 2006-06-09 | 2007-01-17 | 清华大学 | Smoke desulfurization and its desulfurizer by semi-drying method and with straight air-flow along wall |
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| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112142143A (en) * | 2020-10-14 | 2020-12-29 | 南京依涛环保科技有限公司 | System and method for removing heavy metal and chloride ions in evaporative crystallization process of desulfurization wastewater |
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