CN116675276A - High-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and system thereof - Google Patents
High-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and system thereof Download PDFInfo
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- CN116675276A CN116675276A CN202310799771.0A CN202310799771A CN116675276A CN 116675276 A CN116675276 A CN 116675276A CN 202310799771 A CN202310799771 A CN 202310799771A CN 116675276 A CN116675276 A CN 116675276A
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- ammonium sulfate
- absorption tower
- vacuum dryer
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- 238000001035 drying Methods 0.000 title claims abstract description 45
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910052921 ammonium sulfate Inorganic materials 0.000 title claims abstract description 42
- 235000011130 ammonium sulphate Nutrition 0.000 title claims abstract description 42
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 40
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 229910001868 water Inorganic materials 0.000 claims abstract description 84
- 239000007789 gas Substances 0.000 claims abstract description 76
- 238000010521 absorption reaction Methods 0.000 claims abstract description 66
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 44
- 150000003839 salts Chemical class 0.000 claims abstract description 23
- 239000002912 waste gas Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 238000001704 evaporation Methods 0.000 claims abstract description 13
- 230000008020 evaporation Effects 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 35
- 239000002253 acid Substances 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 26
- 238000007599 discharging Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- 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)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and a system thereof, wherein the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process comprises the following steps of; s1, secondary steam processing; s2, generating clear condensate water; s3, generating crystalline salt; s4, collecting and treating ammonia-rich noncondensable gas generated in the vacuum dryer; s5, treating residual waste gas, wherein the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system comprises a dryer feeding tank, a clear condensate water tank, a vacuum dryer, a surface condenser, a sewage condensate water tank, a two-stage spray absorption tower and a waste gas discharge device, and a concentrated solution conveying pipeline is connected to one side end face of the dryer feeding tank. The invention realizes the effects of high safety, treatment of the concentrate remained in the evaporation process, formation of crystalline salt in the vacuum dryer and generation of the condensate water by the steam in the vacuum dryer, and can be recycled, thereby saving energy and protecting environment.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and a system thereof.
Background
On the one hand, excessive ammonia nitrogen can cause mass propagation of autotrophic microorganisms, thereby causing eutrophication pollution of water body; on the other hand, high-concentration salt-containing wastewater causes great burden on municipal wastewater treatment systems, and general industrial wastewater has complex components and possibly contains toxic substances such as heavy metal ions, high-concentration chloride ions and the like, has toxic effects on microorganisms, inhibits microbial activity and influences the stable operation of the wastewater treatment systems
Sulfuric acid is an inorganic substance, colorless crystals or white particles, has no smell of steam and is decomposed above 280 ℃. Solubility 0 solubility 70.6g.20 dissolved 75.4g.30C dissolved 78g.40C dissolving 81g. Melting point 230-280C, is insoluble in alcohol, acetone and hydrogen water, has hygroscopicity, is solidified into blocks after moisture absorption, is heated to above 513C and is completely decomposed into gas, nitrogen, sulfur dioxide and water, and hydrogen is released when the hydrogen is reacted with alkali. React with the chlorinated steel solution to generate barium sulfate precipitate. Protein may also be salted out.
The existing middle treatment process of the ammonium sulfate wastewater treatment process is generally 2 treatment steps; 1. firstly, pretreating the wastewater, and 2, performing evaporative crystallization by utilizing an evaporation process. When the evaporation process is used for crystallization treatment, since the raw water contains a small amount of organic matters and other impurities, the substances are likely not to crystallize with the increase of concentration, and can always exist in the system, when the concentration of the evaporated concentrate is too high, the boiling point of the circulating liquid is rapidly increased and exceeds the allowable working range of MVR, so that the compressor is stopped due to overcurrent. At this time, all materials in the equipment need to be discharged, raw water is restarted, the discharged concentrated materials are treated, otherwise, serious harm is caused to the environment by direct discharge, and the safety is low.
The generated tail gas is collected to reach the emission standard for emission, so that the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and the system thereof are required to be provided for treatment.
Disclosure of Invention
The invention aims to provide a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and a system thereof, which can treat the concentrate remained in the evaporation process, form crystalline salt in a vacuum dryer 1 and generate the steam in the vacuum dryer into condensate water, and can recycle the crystalline salt and the condensate water, thereby being energy-saving and environment-friendly.
In order to achieve the above purpose, the embodiment of the invention provides a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and a system thereof, and the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process comprises the following steps of;
s1, secondary steam processing; the concentrated solution tank generated in the evaporation process is conveyed into a vacuum dryer in the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system by utilizing the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system to carry out drying treatment;
s2, generating clear condensate water; and starting the vacuum dryer to operate, generating condensed water by the steam and discharging the condensed water through the vacuum dryer.
S3, generating crystalline salt; and adding materials into a vacuum dryer, introducing steam, heating to enable wet materials in the vacuum dryer to be heated and gasified, discharging the wet materials through a surface condenser, changing the wet materials into dry materials, finally forming dry crystalline salt, and discharging the dry crystalline salt into a storage box for storage after the crystalline salt is generated.
S4, collecting and treating ammonia-rich noncondensable gas generated in the vacuum dryer 1; and (3) pumping the residual ammonia-rich noncondensable gas in the vacuum dryer through an exhaust gas recovery device, conveying the extracted ammonia-rich noncondensable gas into a surface condenser, setting circulating cooling water flow and pressure value meeting the requirements, cooling, condensing the ammonia-rich noncondensable gas into liquid, and conveying the liquid to a condensing water tank through a conveying pipeline.
S5, treating the residual waste gas; and conveying the residual unreacted tail gas in the surface condenser to a first-stage dilute acid absorption tower box and a second-stage dilute acid absorption tower through an exhaust gas recovery device to wash, adding a reaction solution, starting an acid adding pump while adding the reaction solution, so that ammonia gas is absorbed by water in the second-stage dilute acid absorption tower of the first-stage dilute acid absorption tower box, and after the purified residual gas reaches the standard through a test, discharging the purified residual gas to a tail gas discharge point in a workshop through a third fan.
In one or more embodiments of the present invention, the steam temperature in the S3 step is set to 140-170 ℃.
In one or more embodiments of the present invention, the reaction solution in the S5 step is sulfuric acid.
In one or more embodiments of the present invention, the acid pump in S5 is started by a set PH control, and the PH is 4.5 to 5.5.
The embodiment of the invention provides a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system which comprises a dryer feeding tank, a clear condensate water tank, a vacuum dryer, a surface condenser, a sewage condensate water tank, a two-stage spray absorption tower and a waste gas discharge device.
The end face of one side of the feeding tank of the dryer is connected with a concentrated solution conveying pipeline, the end face of the other side of the feeding tank of the dryer is connected with a feeding pipe, and the end face of the bottom of the feeding tank of the dryer is provided with a control valve; and one side end surface of the condensing water tank is connected with a dryer feeding tank, and the other side end surface of the condensing water tank is connected with a vacuum dryer. The end face of one side of the vacuum dryer is connected with a steam input pipeline, and the vacuum dryer generates crystals and discharges the crystals.
The waste gas recovery device comprises a conveying sealing cover, a first fan, a second fan and a waste gas discharge device, wherein the conveying sealing cover is arranged on the end face of the upper side of the vacuum dryer;
the surface condenser is characterized in that one side end face of the surface condenser is connected with a conveying sealing cover, the other side opposite end face of the surface condenser is connected with a sewage condensing water tank, the end face of the surface condenser, which is positioned on the end face connected with the sewage condensing water tank, is connected with a two-stage spray absorption tower, and the top end face of the surface condenser is connected with a cooling circulating bad water inlet pipeline and a cooling circulating bad water output pipeline.
An original wastewater collecting tank is connected to one side end surface of the sewage condensing water tank; the two-stage spray absorption tower comprises a first ammonia absorption tower and a second ammonia absorption tower, the first ammonia absorption tower is connected with a surface condenser, the first ammonia absorption tower is communicated with the second ammonia absorption tower, and the second ammonia absorption tower is connected with a third exhaust fan. The waste gas discharging device comprises a third exhaust fan and a tail gas conveying pipeline, the waste gas discharging device is communicated with the first ammonia gas absorption tower and the second ammonia gas absorption tower, and the waste gas discharging device discharges waste gas reaching standards.
In one or more embodiments of the invention, a condensate pump is connected between the condensate tank and the dryer feed tank.
In one or more embodiments of the present invention, a sewage condensate pump is disposed between the sewage condensate tank and the raw waste liquid collection tank.
In one or more embodiments of the present invention, a connection pipe is provided between the second ammonia absorption tower and the third exhaust fan, a gas detection sensor is provided on the inside of the connection pipe, and a reject gas delivery pipe is connected between the connection pipe and the surface condenser.
In one or more embodiments of the invention, a liquid level sensor is disposed within the dirty condensate tank.
In one or more embodiments of the present invention, an insulation film is disposed at the connection of the conveying sealing cover and the vacuum dryer, and the insulation film is an e-PTFE film.
Compared with the prior art, the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process and the system thereof have the following benefits;
1) The method has high safety, the concentrate remained in the evaporation process is dried, crystalline salt is formed in the vacuum dryer, and the steam in the vacuum dryer is generated into condensate water, so that the condensate water and the crystalline salt can be recycled, and the method is energy-saving and environment-friendly.
2) And (3) processing the ammonia-rich non-condensable gas generated in the processing process of the vacuum dryer to form the gas emission harmless to the environment.
3) The method can reduce water pollution, recycle valuable byproducts, increase the resource utilization rate of ammonium sulfate-containing wastewater factories and reduce the production cost of the ammonium sulfate-containing wastewater factories.
Drawings
FIG. 1 is a schematic diagram of a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process;
FIG. 2 is a first schematic structural view of a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system;
FIG. 3 is a second schematic diagram of a high safety energy-saving and environment-friendly ammonium sulfate wastewater treatment drying control system.
The main reference numerals illustrate:
the device comprises a 1-vacuum dryer, a 2-steam input pipeline, a 3-concentrated solution conveying pipeline, a 4-electromagnetic valve, a 5-dryer feeding tank, a 6-control valve, a 7-feeding pipe, an 8-discharge hole, a 801-storage tank, an 802-purge condensate pump, a 803-first conveying pipeline, a 9-conveying sealing cover, a 901-second conveying pipeline, a 10-surface condenser, a 1001-cooling cycle bad water inlet pipeline, a 1002-cooling cycle bad water output pipeline, a 1003-third conveying pipeline, a 11-dirty condensate tank, a 1101-dirty condensate pump, a 1102-raw waste liquid collecting tank, a 12-first ammonia gas absorbing tower, a 1201-second ammonia gas absorbing tower, a 1202-unqualified gas conveying pipeline, a 13-third exhaust fan, a 1301-tail gas conveying pipeline and a 14-clear condensate tank.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As shown in fig. 1. According to the invention, the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment and drying process comprises the following steps of;
s1, secondary steam processing; the concentrated solution generated in the evaporation process is conveyed into a vacuum dryer 1 in the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system through a concentration box by utilizing the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system to carry out drying treatment;
s2, generating clear condensate water; the vacuum dryer 1 is started to operate, and steam is fed into the vacuum dryer 1, so that the concentrated solution generated in the evaporation process reacts with the steam, and condensed water formed by the steam is discharged through the vacuum dryer 1.
Wherein the condensate is discharged from the bottom of the vacuum dryer 1 to the condensate tank 14, which is a continuous process when drying is performed, and the generation of condensate has no electric power consumption.
S3, generating crystalline salt; the materials are added into the vacuum dryer 1, steam is introduced, and the materials are heated, so that wet materials in the vacuum dryer 1 are heated and gasified, discharged through the surface condenser 10, and changed into dry materials, finally dry crystal salt is formed, and the dry crystal salt is discharged to the storage box 801 for storage after being generated.
After the materials are added into the vacuum dryer 1, the vacuum dryer 1 is started to indirectly heat, moisture in the wet materials is vaporized by heating, and the vaporized moisture is timely pumped to the surface condenser 10 by the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system;
along with the continuous rotation of the vacuum dryer 1 control, the contact between the material and the heating surface is continuously updated, so that the material is heated uniformly, when the temperature of the moisture is reduced to a set value, the temperature is set to 96.4 ℃, the primary drying process is finished, the wet material is changed into dry material, thereby achieving the drying and crystallization effects, and after the crystallization salt is generated, the material can be discharged to a storage box 801 for storage for secondary utilization.
The generation time is determined according to the heat exchange area, the steam temperature and the moisture content of the material to be treated, wherein the heat exchange area is a fixed value, the steam temperature is set to 140-170 ℃, and the device can ensure the evaporation capacity of 35-45KG/h when the steam temperature is kept at 140-170 ℃. As for power, the vacuum dryer 1 consumes electric energy and steam, and is operated with an average of 13kw+40kg steam per hour.
S4, collecting and treating ammonia-rich noncondensable gas generated in the vacuum dryer 1; the residual ammonia-rich noncondensable gas in the vacuum dryer 1 is pumped by an exhaust gas recovery device and then is conveyed into the surface condenser 10, circulating cooling water flow and pressure values meeting the requirements are set, cooling treatment is carried out, and after the ammonia-rich noncondensable gas is condensed into liquid, the liquid is conveyed to a condensing water tank through a conveying pipeline and is used as a system flushing water source.
When the waste gas is condensed into liquid and then conveyed to the condensing water tank, the condensed water has a certain temperature, but the temperature is not set in the condensing water tank, so that the liquid is conveniently cooled, a liquid level sensor is arranged in the condensing water tank, when the condensing water tank reaches a set liquid level parameter, the sewage condensing water pump 1101 is started, and the sewage is discharged out in time, so that flooding is prevented.
Furthermore, the liquid level parameters can be flexibly adjusted according to the field conditions.
S5, treating the residual waste gas; the residual unreacted tail gas in the surface condenser 10 is conveyed into a primary dilute acid absorption tower box and a secondary dilute acid absorption tower for flushing through an exhaust gas recovery device, and an acid adding point is arranged in the primary dilute acid absorption tower box;
and adding the reaction solution, and starting an acid adding pump at the same time of adding, wherein the starting of the acid adding pump is controlled and started by a set pH value, and the pH value is 4.5-5.5. The ammonia gas is absorbed by water in the second-stage dilute acid absorption tower of the first-stage dilute acid absorption tower box, and the purified residual gas is discharged into the original waste gas exhaust pipe for discharge after reaching the standard through a test.
Wherein the reaction solution is sulfuric acid, and sulfuric acid is added to make the spray water acidic, so that ammonia gas can be prevented from overflowing from the water again.
As shown in fig. 2 to 3, the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system comprises a dryer feeding tank 5, a clear condensate water tank 14, a vacuum dryer 1, a waste gas recovery device, a surface condenser 10, a sewage condensate water tank 11, a two-stage spray absorption tower and a waste gas discharge device, so that concentrated solution generated in an evaporation process in an ammonium sulfate wastewater treatment process is dried, water pollution can be reduced, valuable byproducts can be recycled, the resource utilization rate of an ammonium sulfate-containing wastewater manufacturer is increased, and the production cost of the ammonium sulfate-containing wastewater manufacturer is reduced.
As shown in fig. 2 to 3, the end face of one side of the feeding tank 5 of the dryer is connected with a concentrated solution conveying pipeline 3, the end face of the other side of the feeding tank 5 of the dryer is connected with a feeding pipe 7, so that concentrated solution generated in the evaporation process is conveyed into the vacuum dryer 1 through the concentration box to be further processed and dried, and required materials are conveyed into the vacuum dryer 1 in real time through the feeding pipe 7.
The end face of one side of the clean condensate water tank 14 is connected with the dryer feed tank 5, the end face of the other side is connected with the vacuum dryer 1, a jacket is arranged in the vacuum dryer 1, clean condensate water is formed after steam enters the jacket, and the clean condensate water is discharged to the conveying sealing cover 9 from the bottom of the jacket.
Wherein, be connected with first pipeline 803 between clear condensate water tank 14 and the desiccator feed tank 5, be provided with clear condensate water pump 802 between clear condensate water tank 14 and the desiccator feed tank 5, the comdenstion water that forms in clear condensate water tank 14 and the desiccator feed tank 5 can directly be arranged outward, uses as the water source in outside gardens. The condensate-cleaning pump 802 controls the opening and closing of the first conveying pipe 803 according to specific requirements.
Wherein the bottom end face of the dryer feed tank 5 is provided with a control valve 6, and the dryer feed tank 5 conveys the processed material into the vacuum dryer 1 through the control valve 6.
As shown in fig. 2 to 3, a steam input pipe 2 is connected to the upper end surface of the vacuum dryer 1, so that steam is fed into the vacuum dryer 1 through the steam input pipe 2, wherein the feeding amount of the steam is set to 20-40kg/h.
Wherein the vacuum dryer 1 has the function of generating crystalline salt from the concentrate and generating clean condensate from the steam.
The vacuum dryer 1 is provided with a feed inlet matched with the position of the control valve 6, so that the required materials can be conveniently conveyed.
The vacuum dryer 1 comprises a barrel jacket, a stirring shaft, a barrel, a transmission system, a sealing device and an automatic control system, wherein heat required for drying is provided by steam in the barrel jacket, after materials are added, the heat indirectly heats the materials through the jacket, moisture in wet materials is vaporized by heating, the vaporized moisture is timely pumped to the surface condenser 10 by the automatic control system, the materials are continuously updated by contact with a heating surface along with continuous rotation of the stirring shaft, so that the materials are uniformly heated, when the temperature of the moisture is reduced to a set value, the primary drying process is finished, the wet materials are changed into dry materials, and the drying crystallization effect is achieved.
An electromagnetic valve 4 is arranged between the vacuum dryer 1 and the steam input pipeline 2, so as to control the opening and closing of the electromagnetic valve 4.
Further, a discharge port 8 is provided on one side end surface of the vacuum dryer 1, and the generated crystal salt is transported into the storage tank 801 through the discharge port 8 and then transported to the outside.
As shown in fig. 3, the exhaust gas recovery device comprises a conveying sealing cover 9, a first fan, a second fan and an exhaust gas discharge device, wherein the conveying sealing cover 9 is arranged on the upper end face of the vacuum dryer 1, a second conveying pipeline 901 is connected to the conveying sealing cover 9, and ammonia-rich noncondensable gas and steam generated in the vacuum dryer 1 are conveyed to the first ammonia absorption tower 12 through the second conveying pipeline 901 by the conveying sealing cover 9.
Wherein a first fan is provided in the surface condenser 10 for extracting ammonia-rich noncondensable gas and steam in the vacuum dryer 1 and delivering it into the first ammonia absorption tower 12.
The second ammonia gas absorption tower 1201 and the first ammonia gas absorption tower 12 are respectively provided with a second fan, the second fans absorb unreacted tail gas in the surface condenser 10 into the first ammonia gas absorption tower 12, and the unreacted tail gas is conveyed into the second ammonia gas absorption tower 1201 after the reaction is completed.
The junction of carrying sealed lid 9 and vacuum drier 1 is provided with the isolation membrane, and vacuum drier 1 is located and carries sealed lid 9, and the isolation membrane is e-PTFE membrane, reaches when the first fan in the surface condenser 10 starts, through carrying sealed lid 9 extraction rich ammonia noncondensable gas and steam, and the isolation membrane has the effect of isolating partial vapor this moment, increases the extraction volume of rich ammonia noncondensable gas, improves rich ammonia noncondensable gas's recovery efficiency.
The surface condenser 10 is connected with a two-stage spray absorption tower at the end face connected with the sewage condensing water tank 11, and the end face of the top of the surface condenser 10 is connected with a cooling circulating water inlet pipeline 1001 and a cooling circulating water outlet pipeline 1002, so that the cooling circulating water is automatically conveyed into the surface condenser 10 or discharged according to the requirement.
The surface condenser 10 is a horizontal shell-and-tube type surface condenser 10, a cluster heat exchange tube is arranged in the surface condenser 10, cooling water circularly flows in the heat exchange tube, high Wen Shiqi is condensed on the outer surface of the tube, and condensed liquid, namely condensed water, enters a condensate water tank, and is a continuous process. The flow rate and the pressure of the circulating cooling water can meet the requirements. The device is regulated to have a small range of a cooling water inlet valve, and basically does not regulate.
The opposite end surface of the other side of the surface condenser 10 is connected with a dirty condensing water tank 11, a third conveying pipeline 1003 is connected between the surface condenser 10 and the dirty condensing water tank 11, and the dirty condensing water tank 11 is used for receiving the waste gas in the surface condenser 10, condensing the waste gas into liquid and conveying the liquid to the dirty condensing water tank 11 through the third conveying pipeline 1003.
The sewage condensate tank 11 one side terminal surface is connected with former waste water collecting tank 1102, is provided with level sensor in the sewage condensate tank 11, and when level sensor detected liquid level parameter and reached the critical value, sewage condensate tank 11 in time discharged inside comdenstion water to former waste liquid collecting tank 1102, and wherein the comdenstion water in the former waste liquid collecting tank 1102 can be used as the later stage wash water source.
A dirty condensate pump 1101 is arranged between the dirty condensate tank 11 and the raw waste liquid collection tank 1102, and the dirty condensate pump 1101 is used for discharging the condensed water in the dirty condensate tank 11 to the raw waste liquid collection tank 1102.
The two-stage spray absorption tower comprises a first ammonia absorption tower 12 and a second ammonia absorption tower 1201, wherein the first ammonia absorption tower 12 is connected with the surface condenser 10, and the first ammonia absorption tower 12 is communicated with the second ammonia absorption tower 1201, so that the residual unreacted tail gas in the surface condenser 10 is conveyed into a primary dilute acid absorption tower box and a secondary dilute acid absorption tower for flushing through an exhaust gas recovery device, and ammonia is absorbed.
Further, an acid adding pump is arranged in the first ammonia gas absorption tower 12, an acid adding point is arranged on one side end surface of the first ammonia gas absorption tower 12, sulfuric acid is added during use, the acid adding pump is started while the sulfuric acid is added, and the acid adding pump is started under the control of a set pH value, so that ammonia gas is absorbed by water in the first ammonia gas absorption tower 12 and the second ammonia gas absorption tower 1201;
wherein, be provided with the connecting pipe between second ammonia absorption tower 1201 and the third air exhauster 13, be provided with gas detection sensor on being located the connecting pipe inside between second ammonia absorption tower 1201 and the third air exhauster 13, be connected with disqualified gas delivery pipeline 1202 between connecting pipe and the surface condenser 10 for whether monitoring second ammonia absorption tower 1201 exhaust gas is up to standard, after measuring the dischargeable standard, discharge it, otherwise will carry in the surface condenser 10 again through disqualified gas delivery pipeline 1202 and react the filtration again.
The exhaust gas discharging device comprises a third exhaust fan 13 and a tail gas conveying pipeline 1301, the exhaust gas discharging device is communicated with the first ammonia gas absorption tower 12 and the second ammonia gas absorption tower 1201, the second ammonia gas absorption tower 1201 is connected with the third exhaust fan 13, and the exhaust gas discharging device discharges standard exhaust gas.
Specifically, after the purified residual gas reaches the standard through the test of the gas detection sensor, the purified residual gas is discharged to a tail gas conveying pipeline 1301 through a third exhaust fan 13, and the tail gas conveying pipeline 1301 is discharged to a tail gas discharge point in a workshop.
In use, as shown in fig. 2 to 3, the concentrated solution produced in the evaporation process is conveyed into the vacuum dryer 1 through the concentration tank for further drying, the dryer feed tank 5 is started to convey materials into the vacuum dryer 1, meanwhile, steam is conveyed into the vacuum dryer 1, finally, clear condensate water and crystal salt are formed, the clear condensate water is conveyed into the clear condensate water tank 14, and the crystal salt is conveyed into the storage tank 801 through the discharge port 8.
The ammonia-rich non-condensable gas formed in the processing process of the vacuum dryer 1 is collected, extracted by an exhaust gas recovery device and then conveyed into the surface condenser 10, and the exhaust gas is condensed into liquid and then conveyed into a condensate water tank;
the residual unreacted tail gas in the surface condenser 10 is conveyed into a primary dilute acid absorption tower box and a secondary dilute acid absorption tower through an exhaust gas recovery device to be flushed, and finally, the gas reaching the standard is discharged to a tail gas conveying pipeline 1301 through a third exhaust fan 13, and the tail gas conveying pipeline 1301 is discharged to a tail gas discharge point in a workshop.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment and drying process is characterized by comprising the following steps of;
s1, secondary steam processing; the concentrated solution tank generated in the evaporation process is conveyed into a vacuum dryer in the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system by utilizing the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system to carry out drying treatment;
s2, generating clear condensate water; starting the vacuum dryer to operate, generating condensed water from steam and discharging the condensed water through the vacuum dryer;
s3, generating crystalline salt; adding materials into a vacuum dryer, introducing steam, heating to enable wet materials in the vacuum dryer to be heated and gasified, discharging the wet materials through a surface condenser, changing the wet materials into dry materials, finally forming dry crystalline salt, and discharging the dry crystalline salt into a storage box for storage after the crystalline salt is generated;
s4, collecting and treating ammonia-rich noncondensable gas generated in the vacuum dryer; pumping the residual ammonia-rich noncondensable gas in the vacuum dryer through an exhaust gas recovery device, conveying the extracted ammonia-rich noncondensable gas into a surface condenser, setting circulating cooling water flow and pressure value meeting requirements, cooling, condensing the ammonia-rich noncondensable gas into liquid, and conveying the liquid into a condensing water tank through a conveying pipeline;
s5, treating the residual waste gas; and conveying the residual unreacted tail gas in the surface condenser to a first-stage dilute acid absorption tower box and a second-stage dilute acid absorption tower through an exhaust gas recovery device to wash, adding a reaction solution, starting an acid adding pump while adding the reaction solution, so that ammonia gas is absorbed by water in the second-stage dilute acid absorption tower of the first-stage dilute acid absorption tower box, and after the purified residual gas reaches the standard through a test, discharging the purified residual gas to a tail gas discharge point in a workshop through a third fan.
2. The high safety energy-saving environment-friendly ammonium sulfate wastewater treatment system according to claim 1, wherein the steam temperature in the step S3 is set to 140-170 ℃.
3. The process for treating and drying high-safety energy-saving environment-friendly ammonium sulfate wastewater according to claim 1, wherein the reaction solution in the step S5 is sulfuric acid.
4. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process according to claim 1, wherein the starting of the acid adding pump in the step S5 is controlled and started by a set pH value, and the pH value is 4.5-5.5.
5. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process according to claim 1, which is characterized by comprising a high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system, wherein the high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying control system comprises;
a dryer feed tank; one side end face is connected with a concentrated solution conveying pipeline, the other side end face of the dryer feeding tank is connected with a feeding pipe, and the bottom end face of the dryer feeding tank is provided with a control valve;
a clear condensate water tank; one side end face is connected with a dryer feeding tank, and the other side end face is connected with a vacuum dryer;
a vacuum dryer; one side end face is connected with a steam input pipeline, and the vacuum dryer generates crystals and discharges the crystals;
an exhaust gas recovery device; the vacuum dryer comprises a conveying sealing cover, a first fan, a second fan and a waste gas discharge device, wherein the conveying sealing cover is arranged on the upper end surface of the vacuum dryer;
a surface condenser; one side end face is connected with a conveying sealing cover, the other side opposite end face is connected with a sewage condensing water tank, the end face of the surface condenser, which is connected with the sewage condensing water tank, is connected with a two-stage spray absorption tower, and the top end face of the surface condenser is connected with a cooling circulating bad water inlet pipeline and a cooling circulating bad water output pipeline;
a dirty condensate tank; one side end face is connected with an original wastewater collecting tank;
the two-stage spray absorption tower comprises a first ammonia absorption tower and a second ammonia absorption tower, the first ammonia absorption tower is connected with the surface condenser, the first ammonia absorption tower is communicated with the second ammonia absorption tower, and the second ammonia absorption tower is connected with the third exhaust fan;
the waste gas discharge device comprises a third exhaust fan and a tail gas conveying pipeline, and is communicated with the first ammonia gas absorption tower and the second ammonia gas absorption tower, and the waste gas discharge device discharges waste gas reaching standards.
6. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment and drying process system according to claim 5, wherein a clean condensate pump is connected between the clean condensate water tank and the dryer feed tank.
7. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment and drying process system according to claim 5, wherein a sewage condensate pump is arranged between the sewage condensate tank and the original waste liquid collecting tank.
8. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment drying process system according to claim 5, wherein a connecting pipe is arranged between the second ammonia absorption tower and the third exhaust fan, a gas detection sensor is arranged on the inside of the connecting pipe, and a disqualified gas conveying pipeline is connected between the connecting pipe and the surface condenser.
9. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment and drying process system is characterized in that a liquid level sensor is arranged in the sewage condensing water tank.
10. The high-safety energy-saving environment-friendly ammonium sulfate wastewater treatment and drying process system according to claim 5, wherein an isolation film is arranged at the joint of the conveying sealing cover and the vacuum dryer, and the isolation film is an e-PTFE film.
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