CN203498181U - System for recycling waste acid and waste alkali - Google Patents
System for recycling waste acid and waste alkali Download PDFInfo
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- CN203498181U CN203498181U CN201320625937.9U CN201320625937U CN203498181U CN 203498181 U CN203498181 U CN 203498181U CN 201320625937 U CN201320625937 U CN 201320625937U CN 203498181 U CN203498181 U CN 203498181U
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Abstract
The utility model provides a system for recycling waste acid and waste alkali. The system comprises a pre-filtration system, a circulation tank, a safe filter, a pressurizing pump, a nanofiltration membrane system and a dialyzate tank which are sequentially connected through a pipeline, wherein a concentrate outlet of the nanofiltration membrane system is further connected with the circulation tank. According to the system, acid and alkali are recovered from resin regenerated waste acid and alkali liquor in an original sample manner by adopting a membrane separation technology, so that no phase change exists, the operation is easy, the investment is small, and the benefit is high.
Description
Technical field
The utility model belongs to spent acid salkali waste recovery and utilization technology field, is specially a kind of recycling spent acid salkali waste system.
Background technology
In recent years, membrane technique comprised that membrane bioreactor, reverse osmosis, membrane integrating technique obtained greater advance in the processing of China's town domestic sewage, trade effluent.Adopt membrane technology to process town domestic sewage, not only improved the treatment effect of sewage, greatly reduced the quantity discharged of chemical oxygen demand (COD) (COD) and ammonia nitrogen, and made to have reached reuse level after sewage disposal, realized the resource utilization of sanitary sewage.Membrane technique, in the application of processing on town domestic sewage, is the Important Techmical Progress of sanitary sewage disposal technology, significant to improving local quality of water environment.That membrane technique has been brought into play vital role in Industrial Wastewater Treatment on the one hand in addition.China's discharged volume of industrial waste water is large, and some places gross contamination emission is considerably beyond local environmental capacity, and this is the serious major reasons of some local water environment pollutions.Membrane technique, for Industrial Wastewater Treatment, not only can be cut down significantly pollutant discharge amount, and can accomplish recirculation utilization, significant to water shortage zone.
Be adopted as the sodium hydroxide solution of 5% left and right and the hydrochloric acid of 5% left and right when handing in abstraction process resin regeneration as regeneration reagent, during regeneration ending, produce a large amount of acid, the waste water of alkali content about 3-4%, this waste water contains the impurity such as a large amount of albumen, pigment, metal ion.The unprocessed environmental protection treatment center that is directly discharged into of acid, alkali waste water of existing factory, measure acid greatly in waste water, alkali does not have efficient recovery, has increased the burden of sewage disposal, and the waste having caused.Therefore to utilize the method for spent acid salkali waste be necessary in a kind of high efficiente callback.
Membrane separation technique is to utilize an organic membrane special manufacture, that have selection perviousness.Try hard to recommend outside under moving mixture is carried out to separation, purification, concentrated a kind of new separation technology, be to be isolated by the method for sieving according to the difference of the physical properties of mixture, or separate material according to the different chemical character of mixture.
Along with membrane separation technique is in water treatment.The particularly widespread use in Industrial Wastewater Treatment, membrane separation technique makes great progress.
1, micro-filtration (MF) film application principle and feature
Micro-filtration claims again millipore filtration, and it belongs to secondary filter, and its ultimate principle is sieve aperture sepn process.Under the promotion of pressure reduction, the solvent in stock liquid and little solute particles see through film to low-tension side from the feed liquid side of high pressure, and resulting liquid is commonly referred to as filtrate or sees through liquid, and large particle component tunicle is held back, and reaches the purification object of solution.In addition, also have the absorption of film upper layer to hold back and bridge formation is held back, and holding back in film internal network.Millipore filtration, because fixing in aperture, can guarantee precision and the reliability of filtering.The mechanism of holding back of microfiltration process is sieving action, and what determine membrane separating effect is film physical structure, hole shape and size.
The filtering accuracy of micro-filtration is within the scope of 0.1～10 μ m; its film used is microporous membrane; mean pore size 0.02～10 μ m, can hold back the particulate of diameter 0.05～10 μ m or the polymer substance that relative molecular mass is greater than 1,000,000, and operation pressure reduction is generally 0.01～0.2MPa.Stock liquid is under differential pressure action, wherein water (solvent) flows to the low-tension side of film through the micropore on film, as seeing through liquid, the particulate that is greater than fenestra is trapped, thereby effectively remove particulate, colloid, bacterial micro-organism and other suspended impurity in water, realize the separated of particulate in stock liquid and water solvent, and micro-filtration there are good adaptability and contamination resistance to high turbidity high viscosity water quality.
Microfiltration process operation minute dead-end filtration and two kinds of modes of cross flow filter.When dead-end filtration, water sees through film with the solute particles that is less than fenestra under the promotion of pressure, and the solute particles that is greater than fenestra is trapped, and is conventionally deposited on face.Along with the increase of time, the particle of piling up on face is more and more, and membrane permeability can, by decline, at this moment must stop film is carried out to surface cleaning or replacing.Cross flow filter is that feed liquid is parallel to face and flows under pressure promotes, and the retentate on face is taken away, thereby made film pollute the lower level that remains on.Wherein, adopt cross flow filter and efficiently Air Reverse rinse the service ability that can provide lasting and guarantee to produce water quality stabilizing, there is floor space little, the feature such as the low and working cost of energy consumption is few.Be usually used in the removal of suspended substance fine particle and bacterium in water, when pretreatment system as reverse osmosis, alternative traditional flocculation sediment, mechanical filter and smart filtering technology, greatly reduce occupation area of equipment; Produce the high and water conditioning of water water quality; Can also extend the work-ing life of reverse osmosis system simultaneously; It is high that system automation is controlled degree, and can reduce labour intensity and labour cost and reduce working cost, be High-efficient Water treatment system of new generation.
2, ultrafiltration (UF) film application principle and feature
Ultrafiltration refers to colloidal solid in the lower trap water of exterior power (pressure) effect, and water and little solute particles are through the sepn process of film.This sepn process is mainly included in absorption in film surface and micropore, in hole, stop and be removed (obstruction), at the mechanical retention (screening) on film surface.It can remove more than 98% organism, and more than 99.99% microorganism can guarantee to produce water SDI(sludge density index (SDI)) be less than 1.The structure of ultra-filtration membrane is substantially identical with permeable membrane, and difference is that the epidermal area of ultra-filtration membrane is thicker, approximately 1 μ m, and hole aperture is between 0.005～0.01 μ m.In ultra-filtration and separation process, relative molecular mass is less than 300～500 solute and easily sees through film, and the permeable pressure head of ultra-filtration membrane both sides is less, thus the working pressure of ultrafiltration compared with little many of reverse osmosis, general control is within the scope of 0.04～0.7MPa.The film feature of producing according to different manufacturers, the emergent pressure of decision technique, when lower than emergent pressure or swallowing-capacity, Reversible Regeneration, adopts backwash to obtain regime flow; Higher than emergent pressure or swallowing-capacity, irreversible regeneration, adopts matting.Actual moving process often be take the time as the cycle, carries out respectively automatic back-washing and matting.Its process characteristic be process without phase transformation, can under normal temperature and low pressure, carry out thereby consume energy low; There is not the variation of matter in material, be applicable to the processing of heat-sensitive materials in concentrating and separating process; Can be by the material fractional separation of different molecular weight; In use ultra-filtration membrane inclusion-free comes off, and guarantees the pure of ultrafiltrated.Be usually used in the removal of suspended substance in water, fine particle and bacterium; Semi-conductor industry ultrapure water, unicircuit water for cleaning terminal process; Medicinal water degerming, mineral water preparation, drink water purifying and ultrafiltration are as the pre-treatment of reverse osmosis; The processing reuse of Industrial Wastewater Treatment and municipal wastewater.
3, nanofiltration (NF) film application principle and feature
Nanofiltration membrane is a kind of special separatory membrane, because its surperficial separating layer has the microvoid structure about 1nm, therefore be referred to as nanofiltration membrane.From function definition, it is a kind of functional semi-permeable membranes that allows solvent molecule or some low relative molecular mass solute or low price ion to see through.Between the operational zone of nanofiltration between ultra-filtration membrane and reverse osmosis membrane, in order highly to remove total organic carbon in water (TOC) class poisonous and harmful impurity, develop specially, it has saturating salt rate to a certain degree and the transmitance (40%～60%) of moderate calcium ion, be to remove the organism in surface water and groundwater and carry out the softening desirable membrane element of processing of part, meet and maintain mouthfeel and the required lowest hardness of transmission pipeline network.
Nanofiltration is a kind of novel membrane separation technique, shows two notable features in application: the first its to hold back relative molecular mass be 200～2000 between reverse osmosis membrane and ultra-filtration membrane; It two is that nanofiltration membrane has certain effect of damming to inorganic salt, because the chemical constitution of its surperficial separating layer and its supporting layer is different.The aperture of nanofiltration membrane is nano level, and it makes water when passing through completely, dams or partly dams the material larger than molecular weight water.Wherein, for ion, ion valence mumber is higher, and nanofiltration membrane is just higher to its interception capacity, and generally speaking, nanofiltration membrane monovalent ion can be trapped by divalence or polyvalent ion or most of being dammed.Nanofiltration membrane can be under very low working pressure effective elimination hazardous and noxious substances, retained part nutrient ions effectively again, and there is higher water flux.Nanofiltration membrane can be carried out concentrating and separating to waste water because of its unique performance, organic pollutant can be dammed in concentrated solution, makes water and monovalent ion see through film.
4, reverse osmosis (RO) film application principle and feature
Reverse osmosis is the new membrane separation technique growing up the sixties in 20th century, is to rely on reverse osmosis membrane under pressure, to make the solvent in solution carry out separated process with solute.Nowadays rely on its screening principle and be widely used in various liquid separation system.Reverse osmosis technology is a kind of high-efficiency energy-saving technology.It relies on pressure to promote water and ion isolation, thereby reaches purifying and concentrated object.This process, without phase transformation, does not generally need heating, and energy consumption is low, has running cost low, pollution-free, easy to operate reliable, produces the plurality of advantages such as water water quality height.
In sum, MF (micro-filtration) can filter filter area material such as colloid, clay, colibacillus between 1～0.1 μ m, is usually used in the tap water of production high-quality; To filter area, the particulate such as the bacterium between 0.1～0.01 μ m, virus can filter UF (ultrafiltration); To filter area, part metals ion between 0.01～0.001 μ m etc. has filtering function to NF (nanofiltration); And ultrafiltration and nanofiltration can be used for purified water for drinking, food-drink processing water etc.RO (reverse osmosis) mainly carries out desalting to the higher seawater of water source saltiness, brackish water
Nanofiltration (NF) membrane technique is a kind of novel membrane separation technique growing up over nearly more than 10 years, NF technology has been widely used in to commercial runs such as water treatment, chemical industry, pharmacy, food-processings, nanofiltration membrane is because (as Composite, chargedization) processed in the particularization of its special pore diameter range and preparation, make nanofiltration membrane have that more special separation performance-organism between 200 ~ 1000 has the higher performance that removes to divalent ion and relative molecular mass, relatively low to the decreasing ratio of univalent ion and small organic molecule.Therefore, can adopt nanofiltration membrane to remove the divalent ions such as Ca2+, Mg2+ in acidic and alkaline waste water, SO42-.And how to make full use of the advantage of nanofiltration, and carry out the recycling of effective spent acid salkali waste, be the problem that the utility model need to solve.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of recycling spent acid salkali waste system for the defect of above-mentioned existence.This system adopts membrane separation technique former state recovered acid, alkali from the dirty acid of resin regeneration, alkali lye, without phase transformation, easy to operate, less investment, high efficiency.Experimental results show that the rate of recovery of acid, alkali is more than 80%, and in dirty acid, alkali lye, the clearance of organism, inorganics can reach more than 90%, even up to 99%, and does not have crown_interception very low to acid, alkali, the rate of recovery is more than 80%.Therefore, acid, alkali composition in the dirty acid of energy efficient recovery, alkali lye, and be purified.Assay result shows, restored acid, alkali lye quality reach the standard-required that ion exchange resin regeneration is used completely.
A kind of recycling spent acid salkali waste systems technology scheme of the present utility model is, comprise the pre-filtration system, circulation tank, cartridge filter, force (forcing) pump, nanofiltration membrane system, the dialysis fluid container that by pipeline, connect successively, wherein, the concentrated solution outlet of nanofiltration membrane system is also connected with circulation tank.
Before pre-filtration system, be provided with dehvery pump, CIP tank is connected with dehvery pump, cartridge filter, force (forcing) pump, nanofiltration membrane system respectively.
Between nanofiltration membrane system and circulation tank, be also disposed with high-pressure variable valve and heat exchange system.
Heat exchange system is connected with CIP tank.
Pipeline comprises low pressure line part and pressure duct part, discharge pipe after pipeline before force (forcing) pump entrance, nanofiltration membrane system and and high-pressure variable valve after return line be low pressure line system, after self-pressurization pump, to being pressure duct with high-pressure variable valve pipeline before between nanofiltration membrane system, pressure duct is high-pressure seamless industrial pipeline.
Pre-filtration system is 1 μ m deep bed filter.
Nanofiltration membrane system is rolling nanofiltration membrane component.
Force (forcing) pump top hole pressure is 30bar.
Force (forcing) pump is connected with frequency-changing control system, between force (forcing) pump and nanofiltration membrane system, is connected pneumatic proportional variable valve.
On pipeline, be provided with line temperature sensor, at line pressure sensor, flow monitoring sensor and by-pass valve control, be connected with frequency-changing control system respectively.
Concrete technology flow process is: first by spent acid, alkali lye blowing in circulation tank, in tank, have after certain volume, nanofiltration membrane system brings into operation.Dehvery pump is transported to spent acid, alkali lye in pre-filtration system, and pre-filtering adopts 1 μ m deep bed filter to hold back in alkali regenerative process broken resin, suspended substance and absorbed portion albumen, alleviates the load of membrane filtration system below with protective membrane element.Material is increased to the pressure of certain operation again by force (forcing) pump, be transported to and in rolling nanofiltration membrane component, carry out separation.Water and acid, alkali, under the effect of pressure, penetrated film surface, and separated coming formed dialyzate; The impurity such as calcium, magnesium ion, iron ion, sulfate ion, carbanion, albumen, pigment tunicle are held back, and cannot penetrate film surface, thereby form concentrated solution.Concentrated solution from nanofiltration membrane component out, turn back in circulation tank, proceed to circulate next time, go round and begin again, thereby moisture content is wherein fewer and feweri, volume of material is fewer and feweri.When material is concentrated to after certain volume, batch operation finishes, in circulation tank, stored the impurity that product is concentrated, in dialysis fluid container, be acid, the alkali lye being purified, this acid, alkali lye are got back to the ion-exchange resins post cycling and reutilization in production process, by the recovery of acid, alkali equipment, reduce from handing over hydrochloric acid and the alkali consumption of processing and reducing from the consumption of handing over processing configuration hydrochloric acid softening water, reduce from the friendship quantity discharged of disposing of sewage simultaneously, reduce environmental protection treatment cost.
Cartridge filter is used for holding back because pipeline-cleaning is thorough or mishandle enters the foreign matter of circulation tank, and removes suspended substance and insoluble impurities, with securing system safe operation.
Force (forcing) pump is for rising to certain working pressure, to meet membrane sepn requirement.The high flow rate of the supporting dehvery pump of flow of pump, designs when mouth pressure 30bar decays to meet film core later stage flux performance and can keep original designing treatment ability by the mode of pressurization.Force (forcing) pump is equipped with frequency-changing control system, and by detect operation operating pressure at line pressure sensor, and interlock with pneumatic proportional variable valve below, under the centralized Control of PLC, realize constant voltage or the operation of constant frequency rate.When film core is in different times and has different throughput performance, can guarantee the relatively stable of processing power by variable frequency adjustment working pressure.
Heat exchange system, in order to the cooling heat producing in operational process, guarantees that the temperature of feed liquid in concentration process is equal to or less than feeding temperature.Simultaneously for carry out steam heating when cleaning, improve rinse liquid temperature to guarantee cleaning performance, the optimal clean temperature of scavenging solution is 35-40 degree, before clean-out system configuration, by interchanger handle, without Ion Heating, after 35-40 degree, configures clean-out system again, can guarantee the effective performance of clean-out system.
The welding of all pipelines adopts argon arc welding, all adopts argon shield during welding inside and outside pipeline, to guarantee the not oxidized and carbonization in weld.The connection of pressure duct adopts flange and high pressure clip.Because of alkali equipment storage environment and the same environment of sour equipment, be the hcl corrosion stainless steel frame and the corresponding pipeline that prevent from volatilizing, all stainless steel parts are the outer antifouling paste that is coated with all.
Spot Data Acquisition System:
1) line temperature sensor
System is passed through the working temperature of the temperature sensor Inspection and monitoring system on public conveying pipeline, and detected value is sent to PLC Controlling System.Controlling System is by the gap of detected value and set(ting)value relatively, judges that temperature is whether in normal range.
2) at line pressure sensor
At line pressure sensor, be installed on common feed pipeline and enter on film pipeline, with the operating pressure to system, detect, and data are sent to PLC and process, showing screen display simultaneously, when pressure range surpasses normal value, PLC Controlling System can regulate the working speed of force (forcing) pump automatically, to keep constant pressure.
3) flow monitoring sensor
Controlling System relies on and is arranged on the flow sensor on pipeline, the charging of film system and dialysate flow are monitored, and data are sent to PLC and process, showing screen display simultaneously, when flow surpasses range of normal value, PLC Controlling System can regulate the working speed of pump automatically, to keep the constant of flow.
4) by-pass valve control
Feed liquid soda acid content is higher, and human body directly contact has certain harm, system design corresponding auto-switch switching valve, to realize the full automatic control of system.
Automatic control system
In film system, for main pump motor, be equipped with frequency-variable controller, by the control of PLC system, all can have realized constant current or constant-pressure operation.Be equipped with the effect of frequency-changing control system except can saving power consumption, the flexibility of going back feasible system starts and shuts down, and avoids startup-shutdown to the impact of piping system and film and destruction, and has avoided the influence of fluctuations of startup-shutdown to electrical network; Under different operating modes, can set different operating frequencies by automatic control system, thereby realize optimum working pressure simultaneously.
System adopts programmable logic controller (PLC) to complete electric and automatic control instrument simultaneously, simultaneously by the running status of all kinds of in-line meter Monitoring systemss, adopts an industrial computer to realize monitoring as man-machine interface.
PLC is for receiving, calculate, gather and transmitting control signal, and the data signal of all collection in worksite is all sent to PLC controller, and after processing by PLC, is sent to the online service data that shows on computer.Same all control parameter settings and field control instruction are sent to PLC control unit after also inputting by computer interfaceJi Suanjijiekou, and are sent to each reference mark after PLC control unit is processed, and comprise pump motor etc.
The beneficial effects of the utility model are: adopt membrane separation technique former state recovered acid, alkali from the dirty acid of resin regeneration, alkali lye, and without phase transformation, easy to operate, less investment, high efficiency.Nanofiltration, for the processing of acidic and alkaline waste water, not only can solve the pollution problem of acidic and alkaline waste water to environment, and can improve the repeating utilization factor of soda acid.
The utility model adopts acid and alkali-resistance nanofiltration membrane to filter spent acid, the salkali waste technique in production process, the rate of recovery of acid, alkali reaches more than 80%, in dirty acid, alkali lye, the clearance of organism, inorganics can reach more than 95%, reaches as high as more than 99%, and acid, alkali are not had to crown_interception.Therefore, acid, alkali composition in the dirty acid of energy efficient recovery, alkali lye, and be purified.Assay result shows, restored acid, alkali lye quality reach the standard-required that ion exchange resin regeneration is used completely.
accompanying drawing explanation:
Figure 1 shows that basic structure schematic diagram of the present utility model.
In figure, 1. dialysis fluid container, 4. pre-filtration system, 5. circulation tank, 6. CIP tank, 7. heat exchange system, 8. high-pressure variable valve, 9. nanofiltration membrane system, 10. pneumatic proportional variable valve, 11. force (forcing) pumps, 12. cartridge filters.
embodiment:
In order to understand better the utility model, with specific examples, describe the technical solution of the utility model in detail below, but the utility model is not limited to this.
A kind of recycling spent acid salkali waste system of the present utility model, comprise the pre-filtration system 4, circulation tank 5, cartridge filter 12, force (forcing) pump 11, nanofiltration membrane system 9, the dialysis fluid container 1 that by pipeline, connect successively, wherein, the concentrated solution outlet of nanofiltration membrane system 9 is also connected with circulation tank 5.
Before pre-filtration system 4, be provided with dehvery pump, CIP tank 6 is connected with dehvery pump, cartridge filter 12, force (forcing) pump 11, nanofiltration membrane system 9 respectively.
Between nanofiltration membrane system 9 and circulation tank 5, be also disposed with high-pressure variable valve 8 and heat exchange system 7.
Pipeline comprises low pressure line part and pressure duct part, pipeline before force (forcing) pump 11 entrances, the discharge pipe after nanofiltration membrane system 9 and and high-pressure variable valve 8 after return line be low pressure line system, after self-pressurization pump 11, to being pressure duct with high-pressure variable valve 8 pipeline before between nanofiltration membrane system 9, pressure duct is high-pressure seamless industrial pipeline.
Force (forcing) pump 11 top hole pressures are 30bar.
Force (forcing) pump 11 is connected with frequency-changing control system, between force (forcing) pump 11 and nanofiltration membrane system 9, is connected pneumatic proportional variable valve 10.
On pipeline, be provided with line temperature sensor, at line pressure sensor, flow monitoring sensor and by-pass valve control, be connected with frequency-changing control system respectively.
Embodiment 1
Test water is to produce a large amount of acid, the waste water of alkali content about 3-4% when resin regeneration finishes in friendship abstraction process, and this waste water contains the impurity such as a large amount of albumen, pigment, metal ion.
Nanofiltration membrane used is Tao Shi NF270-4040 acid and alkali-resistance nanofiltration membrane, by polyamide material, be made, single film effective film area is 7.6 m2, maximum feed amount is 3.6 m3/h, maximum operating pressure is 4.14 MPa, and maximum operating temperature is 40 ℃, and water inlet pH value scope is that 1.0 ~ 14.0(data are to take service temperature as 25 ℃, working pressure is 0.48 MPa, and mass concentration is that the NaCl of 2000 mg/L obtains by test).
Concrete technology flow process is: first by spent acid, alkali lye blowing in circulation tank 5, in tank, have after certain volume, nanofiltration membrane system 9 brings into operation.Dehvery pump is transported to spent acid, alkali lye in pre-filtration system 4 by feed liquid entrance 3; pre-filtering adopts 1 μ m deep bed filter to hold back in alkali regenerative process broken resin, suspended substance and absorbed portion albumen, alleviates the load of membrane filtration system below with protective membrane element.Material is increased to the pressure of certain operation again by force (forcing) pump 11, be transported to and in rolling nanofiltration membrane component, carry out separation.Water and acid, alkali, under the effect of pressure, penetrated film surface, and separated coming formed dialyzate; The impurity such as calcium, magnesium ion, iron ion, sulfate ion, carbanion, albumen, pigment tunicle are held back, and cannot penetrate film surface, thereby form concentrated solution.Concentrated solution from nanofiltration membrane component out, turn back in circulation tank 5, proceed to circulate next time, go round and begin again, thereby moisture content is wherein fewer and feweri, volume of material is fewer and feweri.When material is concentrated to after certain volume, batch operation finishes, in circulation tank 5, stored the impurity that product is concentrated, in dialysis fluid container 1, be acid, the alkali lye being purified, this acid, alkali lye are got back to the ion-exchange resins post cycling and reutilization in production process, by the recovery of acid, alkali equipment, reduce from handing over hydrochloric acid and the alkali consumption of processing and reducing from the consumption of handing over processing configuration hydrochloric acid softening water, reduce from the friendship quantity discharged of disposing of sewage simultaneously, reduce environmental protection treatment cost.
Force (forcing) pump 11 is for rising to certain working pressure, to meet membrane sepn requirement.The high flow rate of the supporting dehvery pump of flow of pump, designs when mouth pressure 30bar decays to meet film core later stage flux performance and can keep original designing treatment ability by the mode of pressurization.Force (forcing) pump 11 is equipped with frequency-changing control system, and by detect operation operating pressure at line pressure sensor, and interlock with pneumatic proportional variable valve 10 below, under the centralized Control of PLC, realize constant voltage or the operation of constant frequency rate.When film core is in different times and has different throughput performance, can guarantee the relatively stable of processing power by variable frequency adjustment working pressure.
The welding of all pipelines adopts argon arc welding, all adopts argon shield during welding inside and outside pipeline, to guarantee the not oxidized and carbonization in weld.The connection of pressure duct adopts flange and high pressure clip.Because of alkali equipment storage environment and the same environment of sour equipment, be the hcl corrosion stainless steel frame and the corresponding pipeline that prevent from volatilizing, all stainless steel parts are the outer antifouling paste that is coated with all.
Spot Data Acquisition System:
1) line temperature sensor
System is passed through the working temperature of the temperature sensor Inspection and monitoring system on public conveying pipeline, and detected value is sent to PLC Controlling System.Controlling System is by the gap of detected value and set(ting)value relatively, judges that temperature is whether in normal range.
2) at line pressure sensor
At line pressure sensor, be installed on common feed pipeline and enter on film pipeline, with the operating pressure to system, detect, and data are sent to PLC and process, showing screen display simultaneously, when pressure range surpasses normal value, PLC Controlling System can regulate the working speed of force (forcing) pump automatically, to keep constant pressure.
3) flow monitoring sensor
Controlling System relies on and is arranged on the flow sensor on pipeline, the charging of film system and dialysate flow are monitored, and data are sent to PLC and process, showing screen display simultaneously, when flow surpasses range of normal value, PLC Controlling System can regulate the working speed of pump automatically, to keep the constant of flow.
4) by-pass valve control
Feed liquid soda acid content is higher, and human body directly contact has certain harm, system design corresponding auto-switch switching valve, to realize the full automatic control of system.
Automatic control system
In film system, for main pump motor, be equipped with frequency-variable controller, by the control of PLC system, all can have realized constant current or constant-pressure operation.Be equipped with the effect of frequency-changing control system except can saving power consumption, the flexibility of going back feasible system starts and shuts down, and avoids startup-shutdown to the impact of piping system and film and destruction, and has avoided the influence of fluctuations of startup-shutdown to electrical network; Under different operating modes, can set different operating frequencies by automatic control system, thereby realize optimum working pressure simultaneously.
System adopts programmable logic controller (PLC) to complete electric and automatic control instrument simultaneously, simultaneously by the running status of all kinds of in-line meter Monitoring systemss, adopts an industrial computer to realize monitoring as man-machine interface.
PLC is for receiving, calculate, gather and transmitting control signal, and the data signal of all collection in worksite is all sent to PLC controller, and after processing by PLC, is sent to the online service data that shows on computer.Same all control parameter settings and field control instruction are sent to PLC control unit after also inputting by computer interfaceJi Suanjijiekou, and are sent to each reference mark after PLC control unit is processed, and comprise pump motor etc.
Experimental result surface: adopt membrane separation technique former state recovered acid, alkali from the dirty acid of resin regeneration, alkali lye, without phase transformation, easy to operate, less investment, high efficiency.Nanofiltration, for the processing of acidic and alkaline waste water, not only can solve the pollution problem of acidic and alkaline waste water to environment, and can improve the repeating utilization factor of soda acid.
The utility model adopts acid and alkali-resistance nanofiltration membrane to filter spent acid, the salkali waste technique in production process, the rate of recovery of acid, alkali reaches more than 80%, in dirty acid, alkali lye, the clearance of organism, inorganics can reach more than 95%, reaches as high as more than 99%, and acid, alkali are not had to crown_interception.Therefore, acid, alkali composition in the dirty acid of energy efficient recovery, alkali lye, and be purified.Assay result shows, restored acid, alkali lye quality reach the standard-required that ion exchange resin regeneration is used completely.
Claims (10)
1. recycle spent acid salkali waste system for one kind, it is characterized in that, comprise the pre-filtration system, circulation tank, cartridge filter, force (forcing) pump, nanofiltration membrane system, the dialysis fluid container that by pipeline, connect successively, wherein, the concentrated solution outlet of nanofiltration membrane system is also connected with circulation tank.
2. recycling spent acid salkali waste system according to claim 1, is characterized in that, is provided with dehvery pump before pre-filtration system, and CIP tank is connected with dehvery pump, cartridge filter, force (forcing) pump, nanofiltration membrane system respectively.
3. recycling spent acid salkali waste system according to claim 2, is characterized in that, is also disposed with high-pressure variable valve and heat exchange system between nanofiltration membrane system and circulation tank.
4. recycling spent acid salkali waste system according to claim 3, is characterized in that, heat exchange system is connected with CIP tank.
5. recycling spent acid salkali waste system according to claim 4, it is characterized in that, pipeline comprises low pressure line part and pressure duct part, discharge pipe after pipeline before force (forcing) pump entrance, nanofiltration membrane system and and high-pressure variable valve after return line be low pressure line system, after self-pressurization pump, to being pressure duct with high-pressure variable valve pipeline before between nanofiltration membrane system, pressure duct is high-pressure seamless industrial pipeline.
6. recycling spent acid salkali waste system according to claim 1, is characterized in that, pre-filtration system is 1 μ m deep bed filter.
7. recycling spent acid salkali waste system according to claim 1, is characterized in that, nanofiltration membrane system is rolling nanofiltration membrane component.
8. recycling spent acid salkali waste system according to claim 1, is characterized in that, force (forcing) pump top hole pressure is 30bar.
9. recycling spent acid salkali waste system according to claim 1, is characterized in that, force (forcing) pump is connected with frequency-changing control system, between force (forcing) pump and nanofiltration membrane system, is connected pneumatic proportional variable valve.
10. according to the arbitrary described recycling spent acid salkali waste system of claim 1-9, it is characterized in that, on pipeline, be provided with line temperature sensor, at line pressure sensor, flow monitoring sensor and by-pass valve control, be connected with frequency-changing control system respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320625937.9U CN203498181U (en) | 2013-10-11 | 2013-10-11 | System for recycling waste acid and waste alkali |
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| CN201320625937.9U CN203498181U (en) | 2013-10-11 | 2013-10-11 | System for recycling waste acid and waste alkali |
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| CN201320625937.9U Expired - Fee Related CN203498181U (en) | 2013-10-11 | 2013-10-11 | System for recycling waste acid and waste alkali |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855005A (en) * | 2017-11-20 | 2018-03-30 | 宜宾丝丽雅股份有限公司 | A kind of NF membrane process system of spent lye depth recovery |
| CN109665648A (en) * | 2019-01-29 | 2019-04-23 | 山东恒发环保科技有限公司 | A kind of acid recovery system |
| CN114249479A (en) * | 2021-12-23 | 2022-03-29 | 宁波新福钛白粉有限公司 | Dilute alkali liquor recovery system and method in sulfuric acid method titanium dioxide production process |
-
2013
- 2013-10-11 CN CN201320625937.9U patent/CN203498181U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855005A (en) * | 2017-11-20 | 2018-03-30 | 宜宾丝丽雅股份有限公司 | A kind of NF membrane process system of spent lye depth recovery |
| CN109665648A (en) * | 2019-01-29 | 2019-04-23 | 山东恒发环保科技有限公司 | A kind of acid recovery system |
| CN114249479A (en) * | 2021-12-23 | 2022-03-29 | 宁波新福钛白粉有限公司 | Dilute alkali liquor recovery system and method in sulfuric acid method titanium dioxide production process |
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