CN217148827U - Deoiling device of surplus aqueous ammonia - Google Patents
Deoiling device of surplus aqueous ammonia Download PDFInfo
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- CN217148827U CN217148827U CN202221051420.9U CN202221051420U CN217148827U CN 217148827 U CN217148827 U CN 217148827U CN 202221051420 U CN202221051420 U CN 202221051420U CN 217148827 U CN217148827 U CN 217148827U
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Abstract
The utility model discloses a deoiling device of surplus aqueous ammonia, including circulation tank, ultraphobic membrane module, concentrate pipeline and washing subassembly. The circulation tank is used for receiving and accommodating oily wastewater, and is provided with a concentration detector for detecting the concentration of liquid in the circulation tank. The input port of the ultraphobic membrane module is connected with the output end of the circulation tank, and the ultraphobic membrane module is provided with a concentrated liquid outlet and a clear liquid outlet. The ultraphobic membrane component is used for carrying out oil-water separation on the oily wastewater to obtain clear liquid and concentrated liquid which respectively flow out from a clear liquid outlet and a concentrated liquid outlet. The input end of the concentrated liquid pipeline is communicated with the concentrated liquid outlet, the concentrated liquid pipeline is provided with a first output end and a second output end, and the first output end is communicated with the circulating groove. And the concentrated solution flows out of the first output end and enters the circulating tank after entering the concentrated solution pipeline, and when the concentration of the solution in the circulating tank is greater than a preset concentration value, part of the concentrated solution is discharged from the second output end. The cleaning assembly is connected with the ultraphobic membrane assembly and is used for cleaning blockage of the ultraphobic membrane assembly.
Description
Technical Field
The utility model belongs to the technical field of the coal chemical industry, especially, relate to a deoiling device of surplus aqueous ammonia.
Background
In the coal coking industry, the residual ammonia water is mainly generated in the cooling process of the coal gas, the raw coal gas with the temperature of 650-700 ℃ led out from the coking chamber is intensively sprayed by a circulating ammonia water through a spray head for cooling, and the temperature of the coal gas is reduced to 80-85 ℃. At the same time, about 50-60% of tar in the coal gas is condensed, and part of tar, coal dust and coke particles are mixed together to form tar residue. After the gas is cooled, the temperature is still quite high, and a large amount of tar gas and water vapor are also contained. In order to facilitate conveying, reduce the power consumption of the air blower and effectively recover chemical products, the coal gas is further cooled to 25-35 ℃ (a vertical tube type primary cooler) or 21-22 ℃ (a horizontal tube type primary cooler) after passing through a gas-liquid separator. The condensate flows into the upper section condensate tank through the water seal tank, the condensate is sent into the upper section of the primary cooler by a pump to be sprayed, and the redundant condensate is sent to the mechanized ammonia water clarifying tank. The tar and the ammonia water separated by the gas-liquid separator firstly enter a mechanized ammonia water clarifying tank, and the ammonia water, the tar and the tar residues are separated in the mechanized ammonia water clarifying tank. One part of the ammonia water discharged from the mechanized ammonia water clarifying tank enters a coke oven chamber to be sprayed with cooling coal gas, and the other part of the ammonia water as residual ammonia water is subjected to gravity oil removal through an intermediate tank and then directly enters an ammonia distillation system, so that the residual ammonia water still contains a certain amount of tar (more than 400 ppm) due to the non-ideal simple gravity oil-water separation effect, and a large amount of tar is precipitated on a sieve plate of an ammonia distillation tower after the residual ammonia water is directly sent into the ammonia distillation system, thereby seriously affecting the operation of the ammonia distillation tower. Meanwhile, a large amount of oil is brought into the sewage treatment system, so that the bacterial activity in the sludge of the sewage treatment system is inhibited, and the bacterial poisoning is caused when the bacterial activity is serious, and the residual ammonia water needs to be deoiled.
Therefore, tar in the residual ammonia water is generally separated by a ceramic membrane filter or an air flotation oil removing machine, the air flotation oil removing machine and the ceramic membrane generally can only separate large oil drops and are difficult to remove small oil drops, so that the oil content of the separated residual ammonia water is still more than 100mg/L, the two-section heat exchanger and the three-section heat exchanger behind the ammonia still are frequently blocked by the tar, and when the oil content in the wastewater is more than 50mg/L, the difficulty of biochemical treatment is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an deoiling device of surplus aqueous ammonia to solve the poor problem of surplus aqueous ammonia treatment effect among the prior art.
The technical scheme of the utility model is that:
an oil removing device for residual ammonia water, comprising:
the circulating tank is used for accommodating oily wastewater and receiving external oily wastewater, and a concentration detector is arranged in the circulating tank and used for detecting the concentration of liquid in the circulating tank;
an ultraphobic membrane module, an input port of the ultraphobic membrane module is connected with an output end of the circulation tank, and the ultraphobic membrane module is provided with a concentrated liquid outlet and a clear liquid outlet; the ultraphobic membrane component is used for carrying out oil-water separation on the oily wastewater to obtain clear liquid and concentrated liquid, and the clear liquid and the concentrated liquid respectively flow out from the clear liquid outlet and the concentrated liquid outlet;
the input end of the concentrated liquid pipeline is communicated with the concentrated liquid outlet, the concentrated liquid pipeline is provided with a first output end and a second output end, and the first output end is communicated with the circulating groove; the concentrated solution flows out of the first output end and enters the circulating tank after entering the concentrated solution pipeline, and when the concentration of the solution in the circulating tank is greater than a preset concentration value, part of the concentrated solution is discharged from the second output end;
a cleaning assembly coupled to the ultraphobic membrane assembly for cleaning the ultraphobic membrane assembly for plugging.
Preferably, the ultraphobic membrane module is a tangential flow filtration separation; the ultraphobic membrane module is formed by connecting a plurality of ultraphobic membrane units in series and/or in parallel, the ultraphobic membrane unit comprises a membrane shell and a membrane pipe arranged in the membrane shell, the membrane pipe comprises a supporting piece and a polymer fiber membrane, the supporting piece comprises an inner framework and an outer framework, the polymer fiber membrane is fixed on the inner framework by adopting a roll winding method, and the outer framework is used for fixing the outer layer of the polymer fiber membrane.
Preferably, the polymer fiber membrane is a porous depth filter material woven by fibers with different filament diameters.
Preferably, the membrane tube is replaceably mounted in the membrane housing.
Preferably, the cleaning assembly includes a backwash unit that uses the clear liquid to backwash the ultraphobic membrane module.
Preferably, the clear liquid outlet is communicated with a clear liquid pipeline, the backwashing unit comprises a backwashing liquid supply pipeline, and a buffer tube, a clear liquid tank and a clear liquid pump which are sequentially arranged on the clear liquid pipeline along the flow direction of the clear liquid, the input end and the output end of the backwashing liquid supply pipeline are respectively communicated with the clear liquid pipeline, wherein the input end of the backwashing liquid supply pipeline is arranged behind the clear liquid pump along the flow direction of the clear liquid, and the output end of the backwashing liquid supply pipeline is arranged between the buffer tube and the ultraphobic membrane module;
and a raw liquid valve is arranged on a pipeline between the circulating tank and the ultraphobic membrane component, a buffer valve is arranged on a clear liquid pipeline between the buffer pipe and the clear liquid tank, and a gas inlet is formed in the buffer pipe and used for introducing compressed gas.
Preferably, the cleaning assembly includes a chemical cleaning unit for cleaning the ultraphobic membrane module of blockages with a chemical agent.
Preferably, the circulation tank is communicated with the ultraphobic membrane module through a stock solution pipeline, and a circulation pump is arranged on the stock solution pipeline;
the chemical cleaning unit comprises a chemical cleaning tank, and the chemical cleaning tank is provided with a medicament inlet for adding a chemical medicament; the output end of the chemical washing tank is communicated with the stock solution pipeline, and the connection position is positioned between the circulating tank and the circulating pump; the concentrated solution outlet is also provided with a third output end which is communicated with the chemical washing tank.
Preferably, the chemical cleaning unit further comprises a chemical cleaning circulation pipeline, an output end of the chemical cleaning circulation pipeline is communicated with the chemical cleaning tank, an input end of the chemical cleaning circulation pipeline is communicated with the concentrated liquid pipeline, and the chemical cleaning circulation pipeline is positioned between the circulation pump and the ultraphobic membrane module.
Preferably, the device also comprises a phase separator, wherein a mixed liquid outlet of the phase separator is communicated with the circulating tank, oily wastewater is subjected to primary oil-water separation through the phase separator to obtain oil liquid and water liquid, the oil liquid is discharged, and the water liquid enters the circulating tank from the mixed liquid outlet.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
the utility model provides a deoiling device of surplus aqueous ammonia, oily waste water flow in circulation groove gets into the ultraphobic membrane subassembly from the circulation groove and carries out oil-water separation, obtains clear liquid and fluid after the separation, and the clear liquid gets into follow-up technology, and the dense solution gets into the circulation groove and waits for the separation of circulation once more, when the liquid concentration was greater than the predetermined concentration value in the circulation groove, discharges part dense solution from the second output of dense solution pipeline.
The utility model provides an among the deoiling device of surplus aqueous ammonia, the separation membrane among the ultraoleophobic membrane subassembly has the super oleophobic performance of super hydrophilicity, because oleophobic, the tiny oil drop in the oily waste water hardly adsorbs on the separation membrane surface, but can roll on the free roll in the surface of separation membrane, slowly gathers, and the tiny oil drop fuses into the heavy oil drop, finally forms continuous oil phase, and the aqueous phase then passes through the separation membrane completely to realize water oil separating. After the oily wastewater is filtered by the polymer fiber membrane, the oil content in clear liquid can be lower than 50mg/L (the minimum can be lower than 20mg/L), and the oily wastewater can directly enter an ammonia still for subsequent treatment.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic view of a device for removing oil from residual ammonia water according to the present invention;
FIG. 2 is a schematic structural view of a device for removing oil from residual ammonia water according to the present invention;
fig. 3 is a schematic view of an ultraphobic membrane unit according to the present invention;
fig. 4 is a schematic view of an ultraphobic membrane unit according to the present invention;
fig. 5 is a schematic structural view of a membrane tube according to the present invention;
fig. 6 is a schematic view of another oil removing device for residual ammonia water according to the present invention.
Description of reference numerals:
1: oily wastewater; 2: a circulation tank; 3: an ultraphobic membrane module; 4: a backwashing unit; 5: a chemical cleaning unit; 6: clear liquid; 7: concentrating; 8: a membrane shell; 9: a membrane tube; 10: a handle; 11: a threaded fastener; 12: a unit stock solution inlet; 13: a unit clear liquid outlet; 14: a unit concentrated solution outlet; 15: a unit backwash inlet; 16: a unit chemical cleaning inlet; 17: a polymer fiber film; 18: an inner skeleton; 19: an outer skeleton; 20: a chemical agent; 21: compressing the gas; 22: washing the tank; 23: a buffer tube; 24: a clear liquid tank; 25: a circulation pump; 26: a clear liquid pump; 27: a pressure gauge; 28: a clear liquid valve; 29: a concentrate valve; 30: a stock solution valve; 31: a first output valve; 32: a second output valve; 33: a third output valve; 34: a cushion valve; 35: a chemical washing valve; 36: a circulation valve; 37: a phase separator.
Detailed Description
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
Example 1
Referring to fig. 1 to 5, the present embodiment provides an apparatus for removing oil from residual ammonia water, including a circulation tank 2, an ultraphobic membrane module 3, a concentrate line, and a cleaning module. The circulation tank 2 is used for accommodating the oily wastewater 1 and receiving the external oily wastewater 1, and a concentration detector is arranged in the circulation tank 2 and used for detecting the concentration of liquid in the circulation tank 2.
The input port (referred to as the stock solution inlet) of the ultraphobic membrane module 3 is connected to the output port of the circulation tank 2, and the ultraphobic membrane module 3 has a concentrate outlet and a clear solution outlet. The ultraphobic membrane component 3 is used for carrying out oil-water separation on the oily wastewater 1 to obtain a clear liquid 6 and a concentrated liquid 7, and the clear liquid 6 and the concentrated liquid respectively flow out from a clear liquid outlet and a concentrated liquid outlet.
The input end of the concentrated liquid pipeline is communicated with the concentrated liquid outlet, the concentrated liquid pipeline is provided with a first output end and a second output end, and the first output end is communicated with the circulating groove 2. And the concentrated solution 7 flows out of the first output end after entering the concentrated solution pipeline and enters the circulating tank 2, and when the concentration of the solution in the circulating tank 2 is greater than a preset concentration value, part of the concentrated solution is discharged from the second output end.
The cleaning assembly is connected with the ultraphobic membrane assembly 3 and is used for cleaning blockage of the ultraphobic membrane assembly 3.
The structure of the present embodiment will now be explained.
Each ultraphobic membrane unit comprises a membrane shell 8 and a membrane tube 9 arranged in the membrane shell 8, the membrane tube 9 comprises a support and a polymer fiber membrane 17, the support comprises a porous inner skeleton 18 and an outer skeleton 19, the surface energy of the polymer fiber membrane 17 is low, the polymer fiber membrane 17 is fixed on the inner skeleton 18 by adopting a roll winding method, the outer layer is fixed by using the non-metal outer skeleton 19 to form the membrane tube 9, and the inner skeleton 18, the polymer fiber membrane 17 and the outer skeleton 19 are coaxially arranged.
In this embodiment, the membrane tube 9 is replaceably mounted in the membrane housing 8, so that after the polymer fiber membrane 17 has reached its service life, the membrane tube 9 can be removed and replaced with a new one, and the membrane housing 8 can be used all the time. Specifically, the membrane tube 9 may be connected to the end cap of the membrane housing 8 by means of screw connection or the like, and finally the end cap of the membrane housing 8 is fastened by the screw fastener 11; when the membrane tube 9 needs to be removed, the membrane tube 9 can be taken out of the membrane shell 8 by loosening the threaded fasteners 11, and then the membrane tube 9 is taken down from the end cover of the membrane shell 8. The handle 10 can be arranged on the outer side of the end cover of the membrane shell 8, so that the membrane shell is convenient to install and carry.
The ultraphobic membrane component 3 is used for tangential flow filtration and separation, the outflow direction of the filtrate (clear liquid 6) is vertical to the circulation direction of the feed liquid (oily wastewater 1-concentrated liquid 7), the feed liquid forms a strong turbulent flow effect on the inner surface of the membrane tube 9 to form a large shearing force, the fluid washes the inner surface of the membrane tube 9 at any time, a filter cake cannot be formed, the pressure drop is always stable, and the system can stably run for a long time. The ultraphobic membrane component 3 has the filtering precision of 100 daltons, and can filter macromolecular organic matters (such as pigments, tiny oil drops and the like) in sewage. The polymer fiber membrane 17 is a porous depth type filter material woven by fibers with different filament diameters, has large surface area, can block and adsorb a large amount of pollutants with different shapes and particle diameters by a bending channel formed inside after the fibers are woven and bent, and has the characteristics of small resistance, high pollutant carrying capacity, high temperature resistance (reaching 98 ℃) and the like.
The polymer fiber membrane 17 has super-hydrophilic and super-oleophobic properties under water. Due to the oil repellency, the oil droplets in the oily wastewater 1 are difficult to adsorb on the surface of the polymer fiber membrane 17, but can freely roll on the surface of the polymer fiber membrane 17, slowly aggregate, merge from the oil droplets into large oil droplets, and finally form a continuous oil phase, while the water phase completely passes through the polymer fiber membrane 17, so that the oil-water separation is realized. Meanwhile, due to the characteristic of super oleophobic property under water, oil drops are prevented from being gathered on the surface of the polymer fiber membrane 17, and the problem that membrane pores of the polymer fiber membrane 17 are easy to block is solved. After the oily wastewater 1 is filtered by the polymer fiber membrane 17, the oil content in the clear liquid 6 can be lower than 50mg/L (the minimum can be lower than 20mg/L), and the oily wastewater can directly enter an ammonia still for subsequent treatment.
The utility model discloses in, circulation groove 2 does not indicate the groove structure on the narrow sense, but indicates the container that is used for holding oily waste water 1, can be jar body, pond etc..
The circulation groove 2 is communicated with a stock solution inlet of the ultraphobic membrane module 3 through a stock solution pipeline, a circulation pump 25 is arranged on the stock solution pipeline, and a circulation valve 36 is arranged near a pipe orifice communicated with the circulation groove 2 on the stock solution pipeline. And a clear liquid outlet of the ultraphobic membrane component 3 is communicated with a clear liquid pipeline, clear liquid 6 is output to a subsequent process through the clear liquid pipeline, and a clear liquid valve 28 is arranged on the clear liquid pipeline. A concentrate valve 29 is arranged near the input end of the concentrate pipeline, and a first output valve 31 and a second output valve 32 are respectively arranged near the first output end and the second output end of the concentrate pipeline. The concentration detector is arranged in the circulating tank 2, and when the measured concentration value is less than or equal to a preset concentration value, the first output valve 31 is opened, and the second output valve 32 is closed; when the measured concentration value is greater than the preset concentration value, the first output valve 31 is closed and the second output valve 32 is opened. In this embodiment, the preset concentration value is set to 1000 mg/L; the preset concentration value is specifically set according to actual conditions, and is not limited to this.
Further, a clear liquid branch pipe is connected to the clear liquid pipeline and communicated with the circulation tank 2, and a valve is arranged on the clear liquid branch pipe. When the produced clear liquid is not satisfactory, the clear liquid is returned to the circulation tank 2 through the clear liquid branch pipe and is separated again.
The cleaning assembly may include one or both of backwash unit 4 and chemical cleaning unit 5, and in this embodiment includes both backwash unit 4 and chemical cleaning unit 5. The backwashing unit 4 performs reverse backwashing on the ultraphobic membrane module 3 by using the clear liquid 6 produced by the ultraphobic membrane module 3. In this embodiment, the backwashing unit 4 includes a backwashing liquid-supplementing pipeline, and a buffer tube 23, a clear liquid tank 24, and a clear liquid pump 26 which are sequentially disposed on the clear liquid pipeline along the flow direction of the clear liquid 6, wherein the input end and the output end of the backwashing liquid-supplementing pipeline are respectively communicated with the clear liquid pipeline, and a valve is disposed thereon; wherein, the input end of the back washing liquid supplementing pipeline is arranged between the buffer tube 23 and the clear liquid outlet of the ultraphobic membrane component 3 after the input end of the back washing liquid supplementing pipeline is arranged on the clear liquid pump 26 along the clear liquid 6 flow direction. A stock solution valve 30 is arranged on a stock solution pipeline between the circulating pump 25 and the stock solution inlet of the ultraphobic membrane module 3, a buffer valve 34 is arranged on a clear solution pipeline between the buffer tube 23 and the clear solution tank 24, and a gas inlet is arranged on the buffer tube 23 and used for introducing compressed gas 21.
In this embodiment, the backwashing simultaneously comprises two modes, so that when one of the modes fails, the other mode can be used for standby. During backwashing, the stock solution valve 30 and the buffer valve 34 are closed, in one mode, compressed gas 21 is introduced into the buffer pipe 23, so that clear solution 6 flows back for backwashing, in the other mode, clear solution in the clear solution tank 24 is pumped into the ultraphobic membrane module 3 through a backwashing liquid supplementing pipeline by a clear solution pump 26 for backwashing, and wastewater after the backwashing can enter the circulating tank 2 through a concentrated solution pipeline. Furthermore, conductivity meters can be respectively arranged on the clear liquid pipeline near the clear liquid outlet and the concentrated liquid pipeline near the concentrated liquid outlet, whether the washing is finished or not is judged by comparing the conductivity of the water before and after the washing, and when the difference value of the two conductivity meters is within 5%, the automatic back washing is finished. Preferably, a branch may be connected in parallel to the clear liquid line between the clear liquid outlet and the buffer tube 23, the input end of the branch is arranged near the buffer tank, the output end of the branch is arranged near the clear liquid outlet, a valve is arranged on the branch, the valve is connected in parallel with the clear liquid valve 28, and the branch is used for back washing.
The chemical cleaning unit 5 utilizes the chemical agent 20 to clean the blockage of the ultraphobic membrane component 3, namely, adopts alkali liquor to wet, soak and wash the ultraphobic membrane component 3, and achieves the effect of thoroughly cleaning the ultraphobic membrane component 3 through mechanisms such as saponification reaction and the like. In the embodiment, specifically, the chemical cleaning unit 5 includes a chemical cleaning tank 22, and the chemical cleaning tank 22 is provided with a chemical inlet for adding the chemical agent 20; the output end of the chemical washing tank 22 is communicated with the stock solution path, the connection position is positioned between the circulating valve 36 and the circulating pump 25, and a chemical washing valve 35 is arranged on the pipeline near the output end of the chemical washing tank 22; the concentrate line also has a third output end which is in communication with the chemical wash tank 22 and on which a third output valve 33 is provided.
When chemical cleaning is carried out, the clear liquid valve 28 and the circulating valve 36 are closed, the circulating pump 25 drives liquid in the chemical cleaning tank 22 to be pumped into the ultraphobic membrane module 3, chemical cleaning is carried out on the ultraphobic membrane module 3, and waste liquid after cleaning returns to the chemical cleaning tank 22 from the third output end of the concentrated liquid pipeline for recycling. Further, the chemical cleaning unit 5 further comprises a chemical cleaning circulation pipeline, the output end of the chemical cleaning circulation pipeline is communicated with the chemical cleaning tank 22, the input end of the chemical cleaning circulation pipeline is communicated with the concentrated liquid pipeline, and the chemical cleaning circulation pipeline is positioned between the circulation pump 25 and the ultraphobic membrane module 3; a valve is arranged on the circulating pipeline of the chemical washing. The chemical washing circulating pipeline is used for: the chemical washing tank 22 and the circulating pump 25 form a closed circulation (other inlet and outlet valves are closed), so that the chemicals in the chemical washing tank 22 are mixed more uniformly.
In this embodiment, the clear liquid outlet of the ultraphobic membrane module 3 is used as the input end of the backwashing unit 4, the raw liquid inlet of the ultraphobic membrane module 3 is used as the input end of the chemical cleaning unit 5, in other embodiments, a backwashing inlet and a chemical cleaning inlet may be additionally provided on the ultraphobic membrane module 3, and a corresponding unit backwashing inlet 15 and a corresponding unit chemical cleaning inlet 16 are provided on the membrane shell 8 of the ultraphobic membrane unit, which is not limited herein.
By adopting the oil removing device for the residual ammonia water provided by the embodiment, tar in the oily wastewater 1 is separated without specially arranging a residual ammonia water tank, the residual ammonia water (namely the oily wastewater 1) can be directly conveyed into the circulating tank 2 from the mechanical clarifying tank, liquid in the circulating tank 2 is pumped into the ultraphobic membrane module 3 through the circulating pump 25, and a large amount of clear liquid 6 and a small amount of concentrated liquid 7 are obtained after being filtered by the ultraphobic membrane module 3; the oil content of the clear liquid 6 can be lower than 50mg/L (the lowest oil content can be lower than 20mg/L), the clear liquid can directly enter an ammonia still for subsequent treatment, the concentrated liquid 7 returns to the circulating tank 2, when the concentration of the liquid in the circulating tank 2 reaches 1000mg/L, a part of the concentrated liquid 7 is discharged and enters an underground tank from a second output end of the concentrated liquid pipeline, and circulation is carried out in this way. The discharged part of the concentrated solution 7 enters the underground tank from the second output end of the concentrated solution pipeline, the concentrated solution 7 can be changed to flow into the circulating tank 2 after a certain amount of concentrated solution 7 is discharged to the underground tank, or the concentrated solution 7 can be changed to flow into the circulating tank 2 after the concentration of the liquid in the circulating tank 2 is lower than a certain value until the oily wastewater 1 is newly added, and the like, and the judgment that the discharged part of the concentrated solution 7 enters the underground tank is not specifically limited.
In the oil removing device for residual ammonia water provided by this embodiment, the running resistance of the ultraphobic membrane module 3 is about 0.1-0.2MpaG, and the blocking is not easy to occur by adopting the running mechanism of tangential flow.
However, when the transmembrane pressure difference is greater than 0.25MpaG (pressure values can be obtained by providing pressure gauges 27 in the raw liquid line near the raw liquid inlet and the clear liquid line near the clear liquid outlet, respectively), the membrane module 3 is automatically backwashed with the treated clear liquid 6 by the backwash unit 4, and the waste rinse liquid enters the circulation tank 2 through the concentrated liquid outlet. And when the difference value between the conductivity meter near the clear liquid outlet and the conductivity meter near the concentrated liquid outlet is within 5%, the automatic back flushing is finished.
When the automatic back washing is carried out for more than 30 minutes and the resistance, namely the transmembrane pressure difference is not reduced to 0.05MpaG, the chemical cleaning unit 5 is started to enable the chemical cleaning tank 22, the circulating pump 25, the ultraphobic membrane module 3 and the pipelines communicated with each other to form closed circulation (valves of other inlets and outlets are closed), the chemical cleaning is finally completed through the infiltration and the flushing of alkali liquor, and waste liquid generated by the chemical cleaning flows back to the chemical cleaning tank 22 through a third output end on a concentrated liquid pipeline for recycling.
The main effect of this embodiment is to remove tar, deoiling to the waste water before biochemical treatment to oily waste water 1, reduces the oil content in the waste water by a wide margin, compares with prior art, has the flow short, and degree of automation is high, and the separation precision is high, characteristics such as installation, dismantlement convenience.
Example 2
Referring to fig. 6, this embodiment provides an apparatus for removing oil from residual ammonia, which is added with a pretreatment apparatus for oily wastewater 1 based on embodiment 1.
Specifically, the pretreatment device employs a phase separator 37. The mixed liquid outlet of the phase separator 37 is communicated with the circulating tank 2, the oily wastewater 1 is subjected to primary oil-water separation by the phase separator 37 to obtain oil liquid and water liquid, the oil liquid is discharged, and the water liquid enters the circulating tank 2 from the mixed liquid outlet. The residual ammonia water (oily wastewater 1) conveyed from the mechanized clarifying tank is pretreated by a phase separator 37 to separate most of oil, coal ash suspended matters and the like, and the separated wastewater enters a circulating tank 2.
The phase separator 37 houses a bed of loose fibers and a set of baffles. The loose fiber bed is formed by mixing and weaving PTFE and metal wires, the thickness is 100-300 mm, the porosity is 60-80%, and the loose fiber bed can resist solid particles of 80 um. The baffle groups are made of CPVC, PTFE, 304 and the like, the deflection angles of the baffle groups are 40-70 degrees, and the distance between the baffle groups is 10-20 mm. Under the action of the loose fiber bed and the baffle plate group, the small oil drops can be condensed into large oil drops, so that the oil and water are separated in an accelerated way under the action of gravity. Pretreating by a phase separator 37 to separate most of oil, coal ash suspended matters and the like in the oily wastewater 1, and then feeding the separated wastewater into an ultraphobic membrane module 3 for fine treatment; and the high oil-containing wastewater produced by the phase separator 37 enters an underground tank.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (10)
1. The utility model provides a deoiling device of surplus aqueous ammonia which characterized in that includes:
the circulating tank is used for accommodating oily wastewater and receiving external oily wastewater, and a concentration detector is arranged in the circulating tank and used for detecting the concentration of liquid in the circulating tank;
an ultraphobic membrane module, an input port of the ultraphobic membrane module is connected with an output end of the circulation tank, and the ultraphobic membrane module is provided with a concentrated liquid outlet and a clear liquid outlet; the ultraphobic membrane component is used for carrying out oil-water separation on the oily wastewater to obtain clear liquid and concentrated liquid, and the clear liquid and the concentrated liquid respectively flow out from the clear liquid outlet and the concentrated liquid outlet;
the input end of the concentrated liquid pipeline is communicated with the concentrated liquid outlet, the concentrated liquid pipeline is provided with a first output end and a second output end, and the first output end is communicated with the circulating groove; the concentrated solution flows out of the first output end and enters the circulating tank after entering the concentrated solution pipeline, and when the concentration of the solution in the circulating tank is greater than a preset concentration value, part of the concentrated solution is discharged from the second output end;
a cleaning assembly coupled to the ultraphobic membrane assembly for cleaning the ultraphobic membrane assembly for plugging.
2. The apparatus for removing oil from residual ammonia water according to claim 1, wherein the ultraphobic membrane module is a tangential flow filtration separation; the ultraphobic membrane module is formed by connecting a plurality of ultraphobic membrane units in series and/or in parallel, the ultraphobic membrane unit comprises a membrane shell and a membrane pipe arranged in the membrane shell, the membrane pipe comprises a supporting piece and a polymer fiber membrane, the supporting piece comprises an inner framework and an outer framework, the polymer fiber membrane is fixed on the inner framework by adopting a roll winding method, and the outer framework is used for fixing the outer layer of the polymer fiber membrane.
3. The apparatus of claim 2, wherein the polymer fiber membrane is a porous depth filter woven from fibers having different diameters.
4. The apparatus for removing oil from residual ammonia water according to claim 3, wherein the membrane tube is replaceably installed in the membrane housing.
5. The apparatus of claim 1, wherein the cleaning assembly comprises a backwash unit that uses the clear liquid to backwash the ultraphobic membrane assembly.
6. The apparatus of claim 5, wherein the clear liquid outlet is in communication with a clear liquid line, the backwash unit comprises a backwash fluid supply line, and a buffer tube, a clear liquid tank, and a clear liquid pump sequentially disposed on the clear liquid line along the clear liquid flow direction, wherein an input end and an output end of the backwash fluid supply line are respectively in communication with the clear liquid line, and wherein after the input end of the backwash fluid supply line is disposed on the clear liquid pump along the clear liquid flow direction, the output end of the backwash fluid supply line is disposed between the buffer tube and the ultraphobic oil membrane module;
and a stock solution valve is arranged on a pipeline between the circulating groove and the ultraphobic membrane component, a buffer valve is arranged on a clear solution pipeline between the buffer tube and the clear solution tank, and a gas inlet is formed in the buffer tube and is used for introducing compressed gas.
7. The apparatus of claim 1, wherein the cleaning assembly comprises a chemical cleaning unit for cleaning the ultraphobic membrane module of clogging with a chemical agent.
8. The apparatus of claim 7, wherein the circulation tank is in communication with the ultraphobic membrane module via a raw liquid line, and a circulation pump is disposed on the raw liquid line;
the chemical cleaning unit comprises a chemical cleaning tank, and the chemical cleaning tank is provided with a medicament inlet for adding a chemical medicament; the output end of the chemical washing tank is communicated with the stock solution pipeline, and the connection position is positioned between the circulating tank and the circulating pump; the concentrated solution outlet is also provided with a third output end which is communicated with the chemical washing tank.
9. The apparatus of claim 8, wherein the chemical cleaning unit further comprises a chemical cleaning circulation line, an output end of the chemical cleaning circulation line is communicated with the chemical cleaning tank, and an input end of the chemical cleaning circulation line is communicated with the concentrated solution line and is positioned between the circulation pump and the ultraphobic membrane module.
10. The apparatus of claim 1, further comprising a phase separator, wherein the mixed liquid outlet of the phase separator is communicated with the circulation tank, the oily wastewater is subjected to primary oil-water separation by the phase separator to obtain oil and water, the oil is discharged, and the water enters the circulation tank from the mixed liquid outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221051420.9U CN217148827U (en) | 2022-05-05 | 2022-05-05 | Deoiling device of surplus aqueous ammonia |
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| CN202221051420.9U CN217148827U (en) | 2022-05-05 | 2022-05-05 | Deoiling device of surplus aqueous ammonia |
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| CN217148827U true CN217148827U (en) | 2022-08-09 |
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| CN202221051420.9U Active CN217148827U (en) | 2022-05-05 | 2022-05-05 | Deoiling device of surplus aqueous ammonia |
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